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Import libelf from elftoolchain r1525

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This commit is contained in:
Arun Thomas 2011-05-21 19:11:59 +02:00
parent 314d09adf7
commit 2a839c735e
117 changed files with 18762 additions and 1 deletions
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173
lib/libelf/Makefile Normal file
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# $Id$
# Requires NBSD_LIBC
NBSD_LIBC:= yes
LIB= elf
SRCS= elf.c \
elf_begin.c \
elf_cntl.c \
elf_end.c elf_errmsg.c elf_errno.c \
elf_data.c \
elf_fill.c \
elf_flag.c \
elf_getarhdr.c \
elf_getarsym.c \
elf_getbase.c \
elf_getident.c \
elf_hash.c \
elf_kind.c \
elf_memory.c \
elf_next.c \
elf_rand.c \
elf_rawfile.c \
elf_phnum.c \
elf_shnum.c \
elf_shstrndx.c \
elf_scn.c \
elf_strptr.c \
elf_update.c \
elf_version.c \
gelf_cap.c \
gelf_checksum.c \
gelf_dyn.c \
gelf_ehdr.c \
gelf_getclass.c \
gelf_fsize.c \
gelf_move.c \
gelf_phdr.c \
gelf_rel.c \
gelf_rela.c \
gelf_shdr.c \
gelf_sym.c \
gelf_syminfo.c \
gelf_symshndx.c \
gelf_xlate.c \
libelf_align.c \
libelf_allocate.c \
libelf_ar.c \
libelf_ar_util.c \
libelf_checksum.c \
libelf_data.c \
libelf_ehdr.c \
libelf_extended.c \
libelf_phdr.c \
libelf_shdr.c \
libelf_xlate.c \
compat/mmap.c \
${GENSRCS}
INCS= libelf.h gelf.h elfdefinitions.h
GENSRCS= libelf_fsize.c libelf_msize.c libelf_convert.c
CLEANFILES= ${GENSRCS}
CFLAGS+= -I. -I${.CURDIR} -DNO_MMAP_FILE
SHLIB_MAJOR= 1
WARNS?= 6
MAN= elf.3 \
elf_begin.3 \
elf_cntl.3 \
elf_end.3 \
elf_errmsg.3 \
elf_fill.3 \
elf_flagdata.3 \
elf_getarhdr.3 \
elf_getarsym.3 \
elf_getbase.3 \
elf_getdata.3 \
elf_getident.3 \
elf_getscn.3 \
elf_getphdrnum.3 \
elf_getphnum.3 \
elf_getshdrnum.3 \
elf_getshnum.3 \
elf_getshdrstrndx.3 \
elf_getshstrndx.3 \
elf_hash.3 \
elf_kind.3 \
elf_memory.3 \
elf_next.3 \
elf_rawfile.3 \
elf_rand.3 \
elf_strptr.3 \
elf_update.3 \
elf_version.3 \
gelf.3 \
gelf_checksum.3 \
gelf_fsize.3 \
gelf_getcap.3 \
gelf_getclass.3 \
gelf_getdyn.3 \
gelf_getehdr.3 \
gelf_getmove.3 \
gelf_getphdr.3 \
gelf_getrel.3 \
gelf_getrela.3 \
gelf_getshdr.3 \
gelf_getsym.3 \
gelf_getsyminfo.3 \
gelf_getsymshndx.3 \
gelf_newehdr.3 \
gelf_newphdr.3 \
gelf_update_ehdr.3 \
gelf_xlatetof.3
MLINKS+= \
elf_errmsg.3 elf_errno.3 \
elf_flagdata.3 elf_flagarhdr.3 \
elf_flagdata.3 elf_flagehdr.3 \
elf_flagdata.3 elf_flagelf.3 \
elf_flagdata.3 elf_flagphdr.3 \
elf_flagdata.3 elf_flagscn.3 \
elf_flagdata.3 elf_flagshdr.3 \
elf_getdata.3 elf_newdata.3 \
elf_getdata.3 elf_rawdata.3 \
elf_getscn.3 elf_ndxscn.3 \
elf_getscn.3 elf_newscn.3 \
elf_getscn.3 elf_nextscn.3 \
elf_getshstrndx.3 elf_setshstrndx.3 \
gelf_getcap.3 gelf_update_cap.3 \
gelf_getdyn.3 gelf_update_dyn.3 \
gelf_getmove.3 gelf_update_move.3 \
gelf_getrel.3 gelf_update_rel.3 \
gelf_getrela.3 gelf_update_rela.3 \
gelf_getsym.3 gelf_update_sym.3 \
gelf_getsyminfo.3 gelf_update_syminfo.3 \
gelf_getsymshndx.3 gelf_update_symshndx.3 \
gelf_update_ehdr.3 gelf_update_phdr.3 \
gelf_update_ehdr.3 gelf_update_shdr.3 \
gelf_xlatetof.3 gelf_xlatetom.3
.for E in 32 64
MLINKS+= \
gelf_checksum.3 elf${E}_checksum.3 \
gelf_fsize.3 elf${E}_fsize.3 \
gelf_getehdr.3 elf${E}_getehdr.3 \
gelf_getphdr.3 elf${E}_getphdr.3 \
gelf_getshdr.3 elf${E}_getshdr.3 \
gelf_newehdr.3 elf${E}_newehdr.3 \
gelf_newphdr.3 elf${E}_newphdr.3 \
gelf_xlatetof.3 elf${E}_xlatetof.3 \
gelf_xlatetof.3 elf${E}_xlatetom.3
.endfor
libelf_convert.c: elf_types.m4 libelf_convert.m4
libelf_fsize.c: elf_types.m4 libelf_fsize.m4
libelf_msize.c: elf_types.m4 libelf_msize.m4
.if (${NBSD_LIBC} != "no")
INCSDIR= /usr/netbsd/include
.else
INCSDIR= /usr/include
.endif
.include <bsd.lib.mk>
# FIXME: Change to using base m4 when base m4 is updated
# Keep the .SUFFIXES line after the include of bsd.lib.mk
.SUFFIXES: .m4 .c
.m4.c:
gm4 -D SRCDIR=${.CURDIR} ${.IMPSRC} > ${.TARGET}

12
lib/libelf/README Normal file
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# $FreeBSD$
# $NetBSD$
libelf: a BSD-licensed implementation of the ELF(3)/GELF(3) API.
Documentation:
* Manual page elf.3 contains an overview of the library. Other
manual pages document individual APIs in the library.
* A tutorial "libelf by Example" is available at:
http://people.freebsd.org/~jkoshy/download/libelf/article.html
For ongoing development please see http://elftoolchain.sourceforge.net/

66
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: README.build -- notes on the build process
The "Makefile" in this directory uses BSD make(1) syntax. If you are
trying to build this library on a platform that does not have a
pre-built BSD compatible make(1), then you could try porting NetBSD's
make(1). NetBSD's make(1) is available at:
http://www.crufty.net/help/sjg/bmake.html
: Supporting cross builds
In the general case, libelf may be built for a target operating system
and machine architecture that is different from the host operating
system and machine architecture that the compilation is happening on.
For example, compilation could be running on a Linux/i386 host, with
target binaries being created for a NetBSD/sparc64 system.
To support cross building:
- The top-level "Makefile" pulls in the appropriate make rules for the
target system.
Inside of makefiles, we determine the target OS by looking at the
contents of the ${unix} make variable. The top-level makefile then
includes any target specific makefiles if they exist.
- Operating systems differ in the names and locations of the headers
where their ELF types are defined. They also differ in the set of
ELF types supported.
Instead of relying on the host operating system to provide ELF related
types and symbols, we define these in header <common/elfdefinitions.h>.
- The file "_libelf_config.h" defines the 'native' architecture, byte order
and word size for libelf.
: OS Specific Configuration :
:: Debian ::
The following packages are needed for the build:
- `build-essential'
- `m4'
- `freebsd-buildutils' or `freebsd5-buildutils'
You would need to use `freebsd-make' instead of GNU make to build
the tools. You would also need to place /usr/lib/freebsd in the
shell's `PATH', preferably at the beginning.
:: FreeBSD ::
libelf should build out of the box on FreeBSD versions later than 6.0.
:: NetBSD ::
libelf should build out of the box on NetBSD versions later than 4.0.
:: Ubuntu ::
See the section on 'Debian' above.
: Porting resources on the 'net
The 'predef' project [http://predef.sourceforge.net/] has a
comprehensive list of CPP macros predefined by various OSes.

106
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/*
* $FreeBSD: src/lib/libelf/Version.map,v 1.3 2007/04/29 14:05:22 deischen Exp $
*/
FBSD_1.0 {
global:
elf32_checksum;
elf32_fsize;
elf32_getehdr;
elf32_getphdr;
elf32_getshdr;
elf32_newehdr;
elf32_newphdr;
elf32_xlatetof;
elf32_xlatetom;
elf64_checksum;
elf64_fsize;
elf64_getehdr;
elf64_getphdr;
elf64_getshdr;
elf64_newehdr;
elf64_newphdr;
elf64_xlatetof;
elf64_xlatetom;
elf_begin;
elf_cntl;
elf_end;
elf_errmsg;
elf_errno;
elf_fill;
elf_flagarhdr;
elf_flagdata;
elf_flagehdr;
elf_flagelf;
elf_flagphdr;
elf_flagscn;
elf_flagshdr;
elf_getarhdr;
elf_getarsym;
elf_getbase;
elf_getdata;
elf_getident;
elf_getscn;
elf_getphdrnum;
elf_getphnum;
elf_getshdrnum;
elf_getshnum;
elf_getshdrstrndx;
elf_getshstrndx;
elf_hash;
elf_kind;
elf_memory;
elf_ndxscn;
elf_newdata;
elf_newscn;
elf_next;
elf_nextscn;
elf_rand;
elf_rawdata;
elf_rawfile;
elf_setshstrndx;
elf_strptr;
elf_update;
elf_version;
gelf_checksum;
gelf_fsize;
gelf_getcap;
gelf_getclass;
gelf_getdyn;
gelf_getehdr;
gelf_getmove;
gelf_getphdr;
gelf_getrel;
gelf_getrela;
gelf_getshdr;
gelf_getsym;
gelf_getsyminfo;
gelf_getsymshndx;
gelf_newehdr;
gelf_newphdr;
gelf_update_cap;
gelf_update_dyn;
gelf_update_ehdr;
gelf_update_move;
gelf_update_phdr;
gelf_update_rel;
gelf_update_rela;
gelf_update_shdr;
gelf_update_sym;
gelf_update_syminfo;
gelf_update_symshndx;
gelf_xlatetof;
gelf_xlatetom;
local:
*;
};
/*
* Private symbols, mostly test hooks
*/
FBSDprivate_1.0 {
global:
_libelf_set_error;
_libelf_get_max_error;
_libelf_get_no_error_message;
_libelf_get_unknown_error_message;
};

167
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/*-
* Copyright (c) 2009 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
*/
/**
** Miscellanous definitions needed by multiple components.
**/
#ifndef _ELFTC_H
#define _ELFTC_H
#ifndef NULL
#define NULL ((void *) 0)
#endif
#ifndef offsetof
#define offsetof(T, M) ((int) &((T*) 0) -> M)
#endif
/*
* Supply macros missing from <sys/queue.h>
*/
#ifndef STAILQ_FOREACH_SAFE
#define STAILQ_FOREACH_SAFE(var, head, field, tvar) \
for ((var) = STAILQ_FIRST((head)); \
(var) && ((tvar) = STAILQ_NEXT((var), field), 1); \
(var) = (tvar))
#endif
#ifndef STAILQ_LAST
#define STAILQ_LAST(head, type, field) \
(STAILQ_EMPTY((head)) ? \
NULL : \
((struct type *)(void *) \
((char *)((head)->stqh_last) - offsetof(struct type, field))))
#endif
#ifndef TAILQ_FOREACH_SAFE
#define TAILQ_FOREACH_SAFE(var, head, field, tvar) \
for ((var) = TAILQ_FIRST((head)); \
(var) && ((tvar) = TAILQ_NEXT((var), field), 1); \
(var) = (tvar))
#endif
/*
* VCS Ids.
*/
#ifndef ELFTC_VCSID
#if defined(__FreeBSD__)
#define ELFTC_VCSID(ID) __FBSDID(ID)
#endif
#if defined(__linux__) || defined(__GNU__) || defined(__GLIBC__)
#define ELFTC_VCSID(ID) /**/
#endif
#if defined(__NetBSD__)
#define ELFTC_VCSID(ID) __RCSID(ID)
#endif
#endif /* ELFTC_VCSID */
/*
* Provide an equivalent for getprogname(3).
*/
#ifndef ELFTC_GETPROGNAME
#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__minix)
#include <stdlib.h>
#define ELFTC_GETPROGNAME() getprogname()
#endif /* defined(__FreeBSD__) || defined(__NetBSD__) || defined(__minix) */
#if defined(__linux__)
/*
* GLIBC based systems have a global 'char *' pointer referencing
* the executable's name.
*/
extern const char *program_invocation_short_name;
#define ELFTC_GETPROGNAME() program_invocation_short_name
#endif /* __linux__ */
#endif /* ELFTC_GETPROGNAME */
/**
** Per-OS configuration.
**/
#if defined(__linux__)
#include <endian.h>
#define ELFTC_BYTE_ORDER __BYTE_ORDER
#define ELFTC_BYTE_ORDER_LITTLE_ENDIAN __LITTLE_ENDIAN
#define ELFTC_BYTE_ORDER_BIG_ENDIAN __BIG_ENDIAN
/*
* Debian GNU/Linux is missing strmode(3).
*/
#define ELFTC_HAVE_STRMODE 0
/* Whether we need to supply {be,le}32dec. */
#define ELFTC_NEED_BYTEORDER_EXTENSIONS 1
#define roundup2 roundup
#endif /* __linux__ */
#if defined(__FreeBSD__)
#include <sys/endian.h>
#define ELFTC_BYTE_ORDER _BYTE_ORDER
#define ELFTC_BYTE_ORDER_LITTLE_ENDIAN _LITTLE_ENDIAN
#define ELFTC_BYTE_ORDER_BIG_ENDIAN _BIG_ENDIAN
#define ELFTC_HAVE_STRMODE 1
#endif /* __FreeBSD__ */
#if defined(__NetBSD__) || defined(__minix)
#include <sys/endian.h>
#define ELFTC_BYTE_ORDER _BYTE_ORDER
#define ELFTC_BYTE_ORDER_LITTLE_ENDIAN _LITTLE_ENDIAN
#define ELFTC_BYTE_ORDER_BIG_ENDIAN _BIG_ENDIAN
#define ELFTC_HAVE_STRMODE 1
#endif /* __NetBSD __ || __minix */
#endif /* _ELFTC_H */

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/*-
* Copyright (c) 2006,2008-2010 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
*/
#ifndef __LIBELF_H_
#define __LIBELF_H_
#include <sys/queue.h>
#include "_libelf_config.h"
#include "_elftc.h"
#include "libelf_compat.h"
/*
* Library-private data structures.
*/
#define LIBELF_MSG_SIZE 256
struct _libelf_globals {
int libelf_arch;
unsigned int libelf_byteorder;
int libelf_class;
int libelf_error;
int libelf_fillchar;
unsigned int libelf_version;
char libelf_msg[LIBELF_MSG_SIZE];
};
extern struct _libelf_globals _libelf;
#define LIBELF_PRIVATE(N) (_libelf.libelf_##N)
#define LIBELF_ELF_ERROR_MASK 0xFF
#define LIBELF_OS_ERROR_SHIFT 8
#define LIBELF_SET_ERROR(E, O) do { \
LIBELF_PRIVATE(error) = ((ELF_E_##E & LIBELF_ELF_ERROR_MASK)| \
((O) << LIBELF_OS_ERROR_SHIFT)); \
} while (0)
#define LIBELF_ADJUST_AR_SIZE(S) (((S) + 1U) & ~1U)
/*
* Flags for library internal use. These use the upper 16 bits of a
* flags field.
*/
#define LIBELF_F_DATA_MALLOCED 0x010000 /* whether data was malloc'ed */
#define LIBELF_F_MMAP 0x020000 /* whether e_rawfile was mmap'ed */
#define LIBELF_F_SHDRS_LOADED 0x040000 /* whether all shdrs were read in */
#define LIBELF_F_AR_VARIANT_SVR4 0x080000 /* BSD style ar(1) archive */
#define LIBELF_F_AR_HEADER 0x100000 /* translated header available */
struct _Elf {
int e_activations; /* activation count */
unsigned int e_byteorder; /* ELFDATA* */
int e_class; /* ELFCLASS* */
Elf_Cmd e_cmd; /* ELF_C_* used at creation time */
int e_fd; /* associated file descriptor */
unsigned int e_flags; /* ELF_F_*, LIBELF_F_* flags */
Elf_Kind e_kind; /* ELF_K_* */
Elf *e_parent; /* non-NULL for archive members */
char *e_rawfile; /* uninterpreted bytes */
size_t e_rawsize; /* size of uninterpreted bytes */
unsigned int e_version; /* file version */
/*
* Header information for archive members. See the
* LIBELF_F_AR_HEADER flag.
*/
union {
Elf_Arhdr *e_arhdr; /* translated header */
char *e_rawhdr; /* untranslated header */
} e_hdr;
union {
struct { /* ar(1) archives */
off_t e_next; /* set by elf_rand()/elf_next() */
int e_nchildren;
char *e_rawstrtab; /* file name strings */
size_t e_rawstrtabsz;
char *e_rawsymtab; /* symbol table */
size_t e_rawsymtabsz;
Elf_Arsym *e_symtab;
size_t e_symtabsz;
} e_ar;
struct { /* regular ELF files */
union {
Elf32_Ehdr *e_ehdr32;
Elf64_Ehdr *e_ehdr64;
} e_ehdr;
union {
Elf32_Phdr *e_phdr32;
Elf64_Phdr *e_phdr64;
} e_phdr;
STAILQ_HEAD(, _Elf_Scn) e_scn; /* section list */
size_t e_nphdr; /* number of Phdr entries */
size_t e_nscn; /* number of sections */
size_t e_strndx; /* string table section index */
} e_elf;
} e_u;
};
struct _Elf_Scn {
union {
Elf32_Shdr s_shdr32;
Elf64_Shdr s_shdr64;
} s_shdr;
STAILQ_HEAD(, _Elf_Data) s_data; /* list of Elf_Data descriptors */
STAILQ_HEAD(, _Elf_Data) s_rawdata; /* raw data for this section */
STAILQ_ENTRY(_Elf_Scn) s_next;
struct _Elf *s_elf; /* parent ELF descriptor */
unsigned int s_flags; /* flags for the section as a whole */
size_t s_ndx; /* index# for this section */
uint64_t s_offset; /* managed by elf_update() */
uint64_t s_rawoff; /* original offset in the file */
uint64_t s_size; /* managed by elf_update() */
};
enum {
ELF_TOFILE,
ELF_TOMEMORY
};
#define LIBELF_COPY_U32(DST,SRC,NAME) do { \
if ((SRC)->NAME > UINT_MAX) { \
LIBELF_SET_ERROR(RANGE, 0); \
return (0); \
} \
(DST)->NAME = (SRC)->NAME; \
} while (0)
#define LIBELF_COPY_S32(DST,SRC,NAME) do { \
if ((SRC)->NAME > INT_MAX || \
(SRC)->NAME < INT_MIN) { \
LIBELF_SET_ERROR(RANGE, 0); \
return (0); \
} \
(DST)->NAME = (SRC)->NAME; \
} while (0)
/*
* Prototypes
*/
Elf_Data *_libelf_allocate_data(Elf_Scn *_s);
Elf *_libelf_allocate_elf(void);
Elf_Scn *_libelf_allocate_scn(Elf *_e, size_t _ndx);
Elf_Arhdr *_libelf_ar_gethdr(Elf *_e);
Elf *_libelf_ar_open(Elf *_e);
Elf *_libelf_ar_open_member(int _fd, Elf_Cmd _c, Elf *_ar);
int _libelf_ar_get_member(char *_s, size_t _sz, int _base, size_t *_ret);
Elf_Arsym *_libelf_ar_process_bsd_symtab(Elf *_ar, size_t *_dst);
Elf_Arsym *_libelf_ar_process_svr4_symtab(Elf *_ar, size_t *_dst);
unsigned long _libelf_checksum(Elf *_e, int _elfclass);
void *_libelf_ehdr(Elf *_e, int _elfclass, int _allocate);
int _libelf_falign(Elf_Type _t, int _elfclass);
size_t _libelf_fsize(Elf_Type _t, int _elfclass, unsigned int _version,
size_t count);
int (*_libelf_get_translator(Elf_Type _t, int _direction, int _elfclass))
(char *_dst, size_t dsz, char *_src, size_t _cnt, int _byteswap);
void *_libelf_getphdr(Elf *_e, int _elfclass);
void *_libelf_getshdr(Elf_Scn *_scn, int _elfclass);
void _libelf_init_elf(Elf *_e, Elf_Kind _kind);
int _libelf_load_section_headers(Elf *e, void *ehdr);
int _libelf_malign(Elf_Type _t, int _elfclass);
size_t _libelf_msize(Elf_Type _t, int _elfclass, unsigned int _version);
void *_libelf_newphdr(Elf *_e, int _elfclass, size_t _count);
Elf_Data *_libelf_release_data(Elf_Data *_d);
Elf *_libelf_release_elf(Elf *_e);
Elf_Scn *_libelf_release_scn(Elf_Scn *_s);
int _libelf_setphnum(Elf *_e, void *_eh, int _elfclass, size_t _phnum);
int _libelf_setshnum(Elf *_e, void *_eh, int _elfclass, size_t _shnum);
int _libelf_setshstrndx(Elf *_e, void *_eh, int _elfclass,
size_t _shstrndx);
Elf_Data *_libelf_xlate(Elf_Data *_d, const Elf_Data *_s,
unsigned int _encoding, int _elfclass, int _direction);
int _libelf_xlate_shtype(uint32_t _sht);
#endif /* __LIBELF_H_ */

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/*-
* Copyright (c) 2010 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS `AS IS' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef __LIBELF_AR_H_
#define __LIBELF_AR_H_
/*
* Prototypes and declarations needed by libelf's ar(1) archive
* handling code.
*/
#include <ar.h>
#define LIBELF_AR_BSD_EXTENDED_NAME_PREFIX "#1/"
#define LIBELF_AR_BSD_SYMTAB_NAME "__.SYMDEF"
#define LIBELF_AR_BSD_EXTENDED_NAME_PREFIX_SIZE \
(sizeof(LIBELF_AR_BSD_EXTENDED_NAME_PREFIX) - 1)
#define IS_EXTENDED_BSD_NAME(NAME) \
(strncmp((NAME), LIBELF_AR_BSD_EXTENDED_NAME_PREFIX, \
LIBELF_AR_BSD_EXTENDED_NAME_PREFIX_SIZE) == 0)
char *_libelf_ar_get_string(const char *_buf, size_t _sz, int _rawname,
int _svr4names);
char *_libelf_ar_get_raw_name(const struct ar_hdr *_arh);
char *_libelf_ar_get_translated_name(const struct ar_hdr *_arh, Elf *_ar);
int _libelf_ar_get_number(const char *_buf, size_t _sz, int _base,
size_t *_ret);
#endif /* __LIBELF_AR_H_ */

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/*-
* Copyright (c) 2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifdef __FreeBSD__
#define LIBELF_VCSID(ID) __FBSDID(ID)
/*
* Define LIBELF_{ARCH,BYTEORDER,CLASS} based on the machine architecture.
* See also: <machine/elf.h>.
*/
#if defined(__amd64__)
#define LIBELF_ARCH EM_X86_64
#define LIBELF_BYTEORDER ELFDATA2LSB
#define LIBELF_CLASS ELFCLASS64
#elif defined(__arm__)
#define LIBELF_ARCH EM_ARM
#if defined(__ARMEB__) /* Big-endian ARM. */
#define LIBELF_BYTEORDER ELFDATA2MSB
#else
#define LIBELF_BYTEORDER ELFDATA2LSB
#endif
#define LIBELF_CLASS ELFCLASS32
#elif defined(__i386__)
#define LIBELF_ARCH EM_386
#define LIBELF_BYTEORDER ELFDATA2LSB
#define LIBELF_CLASS ELFCLASS32
#elif defined(__ia64__)
#define LIBELF_ARCH EM_IA_64
#define LIBELF_BYTEORDER ELFDATA2LSB
#define LIBELF_CLASS ELFCLASS64
#elif defined(__mips__)
#define LIBELF_ARCH EM_MIPS
#if defined(__MIPSEB__)
#define LIBELF_BYTEORDER ELFDATA2MSB
#else
#define LIBELF_BYTEORDER ELFDATA2LSB
#endif
#define LIBELF_CLASS ELFCLASS32
#elif defined(__powerpc__)
#define LIBELF_ARCH EM_PPC
#define LIBELF_BYTEORDER ELFDATA2MSB
#define LIBELF_CLASS ELFCLASS32
#elif defined(__sparc__)
#define LIBELF_ARCH EM_SPARCV9
#define LIBELF_BYTEORDER ELFDATA2MSB
#define LIBELF_CLASS ELFCLASS64
#else
#error Unknown FreeBSD architecture.
#endif
#endif /* __FreeBSD__ */
#ifdef __NetBSD__
#include <machine/elf_machdep.h>
#define LIBELF_VCSID(ID) __RCSID(ID)
#if !defined(ARCH_ELFSIZE)
#error ARCH_ELFSIZE is not defined.
#endif
#if ARCH_ELFSIZE == 32
#define LIBELF_ARCH ELF32_MACHDEP_ID
#define LIBELF_BYTEORDER ELF32_MACHDEP_ENDIANNESS
#define LIBELF_CLASS ELFCLASS32
#define Elf_Note Elf32_Nhdr
#else
#define LIBELF_ARCH ELF64_MACHDEP_ID
#define LIBELF_BYTEORDER ELF64_MACHDEP_ENDIANNESS
#define LIBELF_CLASS ELFCLASS64
#define Elf_Note Elf64_Nhdr
#endif
#endif /* __NetBSD__ */
/*
* GNU & Linux compatibility.
*
* `__linux__' is defined in an environment runs the Linux kernel and glibc.
* `__GNU__' is defined in an environment runs a GNU kernel (Hurd) and glibc.
* `__GLIBC__' is defined for an environment that runs glibc over a non-GNU
* kernel such as GNU/kFreeBSD.
*/
#if defined(__linux__) || defined(__GNU__) || defined(__GLIBC__)
#if defined(__linux__)
#include "native-elf-format.h"
#define LIBELF_CLASS ELFTC_CLASS
#define LIBELF_ARCH ELFTC_ARCH
#define LIBELF_BYTEORDER ELFTC_BYTEORDER
#endif /* defined(__linux__) */
#define LIBELF_VCSID(ID)
#if LIBELF_CLASS == ELFCLASS32
#define Elf_Note Elf32_Nhdr
#elif LIBELF_CLASS == ELFCLASS64
#define Elf_Note Elf64_Nhdr
#else
#error LIBELF_CLASS needs to be one of ELFCLASS32 or ELFCLASS64
#endif
#define roundup2 roundup
#endif /* defined(__linux__) || defined(__GNU__) || defined(__GLIBC__) */
#ifdef __minix
#define LIBELF_VCSID(ID)
/*
* Define LIBELF_{ARCH,BYTEORDER,CLASS} based on the machine architecture.
* See also: <machine/elf.h>.
*/
#if defined(__amd64__)
#define LIBELF_ARCH EM_X86_64
#define LIBELF_BYTEORDER ELFDATA2LSB
#define LIBELF_CLASS ELFCLASS64
#elif defined(__arm__)
#define LIBELF_ARCH EM_ARM
#if defined(__ARMEB__) /* Big-endian ARM. */
#define LIBELF_BYTEORDER ELFDATA2MSB
#else
#define LIBELF_BYTEORDER ELFDATA2LSB
#endif
#define LIBELF_CLASS ELFCLASS32
#elif defined(__i386__)
#define LIBELF_ARCH EM_386
#define LIBELF_BYTEORDER ELFDATA2LSB
#define LIBELF_CLASS ELFCLASS32
#elif defined(__ia64__)
#define LIBELF_ARCH EM_IA_64
#define LIBELF_BYTEORDER ELFDATA2LSB
#define LIBELF_CLASS ELFCLASS64
#elif defined(__mips__)
#define LIBELF_ARCH EM_MIPS
#if defined(__MIPSEB__)
#define LIBELF_BYTEORDER ELFDATA2MSB
#else
#define LIBELF_BYTEORDER ELFDATA2LSB
#endif
#define LIBELF_CLASS ELFCLASS32
#elif defined(__powerpc__)
#define LIBELF_ARCH EM_PPC
#define LIBELF_BYTEORDER ELFDATA2MSB
#define LIBELF_CLASS ELFCLASS32
#elif defined(__sparc__)
#define LIBELF_ARCH EM_SPARCV9
#define LIBELF_BYTEORDER ELFDATA2MSB
#define LIBELF_CLASS ELFCLASS64
#else
#error Unknown MINIX architecture.
#endif
#endif /* __minix */

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#include <sys/cdefs.h>
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <libelf.h>
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "_libelf.h"
#include "../libelf_compat.h"
void *
libelf_mmap(void *addr, size_t len, int prot, int flags, int fd, off_t offset)
{
void *p; /* malloc'ed pointer */
size_t bufsize;
if ((addr != NULL) || (flags != MAP_PRIVATE) || (prot != PROT_READ)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (MAP_FAILED);
}
/*
* Fall back to malloc+read.
*/
p = NULL;
bufsize = 1024 * 1024;
while (/*CONSTCOND*/true) {
void *newp = realloc(p, bufsize);
ssize_t rsz;
if (newp == NULL) {
free(p);
LIBELF_SET_ERROR(RESOURCE, 0);
return (MAP_FAILED);
}
p = newp;
rsz = pread(fd, p, bufsize, 0);
if (rsz == -1) {
free(p);
LIBELF_SET_ERROR(IO, errno);
return (MAP_FAILED);
} else if ((size_t) rsz > bufsize) {
free(p);
LIBELF_SET_ERROR(IO, EIO); /* XXX */
return (MAP_FAILED);
} else if ((size_t) rsz < bufsize) {
/*
* try to shrink the buffer.
*/
newp = realloc(p, (size_t) rsz);
if (newp != NULL) {
p = newp;
}
break;
}
bufsize *= 2;
}
return p;
}
int
libelf_munmap(void *addr, size_t len)
{
free(addr);
return 0;
}

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.\" Copyright (c) 2006-2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd October 21, 2007
.Os
.Dt ELF 3
.Sh NAME
.Nm elf
.Nd API for manipulating ELF objects
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Sh DESCRIPTION
The
.Lb libelf
provides functions that allow an application to read and manipulate
ELF object files, and to read
.Xr ar 1
archives.
The library allows the manipulation of ELF objects in a byte ordering
and word-size independent way, allowing an application to read and
create ELF objects for 32 and 64 bit architectures and for little-
and big-endian machines.
The library is capable of processing ELF objects that use extended
section numbering.
.Pp
This manual page serves to provide an overview of the functionality in
the ELF library.
Further information may found in the manual pages for individual
.Xr ELF 3
functions that comprise the library.
.Ss ELF Concepts
As described in
.Xr elf 5 ,
ELF files contain several data structures that are laid out in a
specific way.
ELF files begin with an
.Dq Executable Header ,
and may contain an optional
.Dq Program Header Table ,
and optional data in the form of ELF
.Dq sections .
A
.Dq Section Header Table
describes the content of the data in these sections.
.Pp
ELF objects have an associated
.Dq "ELF class"
which denotes the natural machine word size for the architecture
the object is associated with.
Objects for 32 bit architectures have an ELF class of
.Dv ELFCLASS32 .
Objects for 64 bit architectures have an ELF class of
.Dv ELFCLASS64 .
.Pp
ELF objects also have an associated
.Dq endianness
which denotes the endianness of the machine architecture associated
with the object.
This may be
.Dv ELFDATA2LSB
for little-endian architectures and
.Dv ELFDATA2MSB
for big-endian architectures.
.Pp
ELF objects are also associated with an API version number.
This version number determines the layout of the individual components
of an ELF file and the semantics associated with these.
.Ss Data Representation And Translation
The
.Xr ELF 3
library distinguishes between
.Dq native
representations of ELF data structures and their
.Dq file
representations.
.Pp
An application would work with ELF data in its
.Dq native
representation, i.e., using the native byteorder and alignment mandated
by the processor the application is running on.
The
.Dq file
representation of the same data could use a different byte ordering
and follow different constraints on object alignment than these native
constraints.
.Pp
Accordingly, the
.Xr ELF 3
library offers translation facilities
.Xr ( elf32_xlatetof 3 ,
.Xr elf32_xlatetom 3 ,
.Xr elf64_xlatetof 3
and
.Xr elf64_xlatetom 3 )
to and from these
representations and also provides higher-level APIs that retrieve and store
data from the ELF object in a transparent manner.
.Ss Library Working Version
Conceptually, there are three version numbers associated with an
application using the ELF library to manipulate ELF objects:
.Bl -bullet -compact -offset indent
.It
The ELF version that the application was compiled against.
This version determines the ABI expected by the application.
.It
The ELF version of the ELF object being manipulated by the
application through the ELF library.
.It
The ELF version (or set of versions) supported by the ELF library itself.
.El
.Pp
In order to facilitate working with ELF objects of differing versions,
the ELF library requires the application to call the
.Fn elf_version
function before invoking many of its operations, in order to inform
the library of the application's desired working version.
.Pp
In the current implementation, all three versions have to be
.Dv EV_CURRENT .
.Ss Namespace use
The ELF library uses the following prefixes:
.Bl -tag -width "ELF_F_*"
.It Dv elf_
Used for class-independent functions.
.It Dv elf32_
Used for functions working with 32 bit ELF objects.
.It Dv elf64_
Used for functions working with 64 bit ELF objects.
.It Dv Elf_
Used for class-independent data types.
.It Dv ELF_C_
Used for command values used in a few functions.
These symbols are defined as members of the
.Vt Dv Elf_Cmd
enumeration.
.It Dv ELF_E_
Used for error numbers.
.It Dv ELF_F_
Used for flags.
.It Dv ELF_K_
These constants define the kind of file associated with an ELF
descriptor.
See
.Xr elf_kind 3 .
The symbols are defined by the
.Vt Elf_Kind
enumeration.
.It Dv ELF_T_
These values are defined by the
.Vt Elf_Type
enumeration, and denote the types of ELF data structures
that can be present in an ELF object.
.El
.Pp
In addition, the library uses symbols with prefixes
.Dv _ELF
and
.Dv _libelf
for its internal use.
.Ss Descriptors
Applications communicate with the library using descriptors.
These are:
.Bl -tag -width ".Vt Elf_Data"
.It Vt Elf
An
.Vt Elf
descriptor represents an ELF object or an
.Xr ar 1
archive.
It is allocated using one of the
.Fn elf_begin
or
.Fn elf_memory
functions.
An
.Vt Elf
descriptor can be used to read and write data to an ELF file.
An
.Vt Elf
descriptor can be associated with zero or more
.Vt Elf_Scn
section descriptors.
.Pp
Given an ELF descriptor, the application may retrieve the ELF
object's class-dependent
.Dq "Executable Header"
structures using the
.Fn elf32_getehdr
or
.Fn elf64_getehdr
functions.
A new Ehdr structure may be allocated using the
.Fn elf64_newehdr
or
.Fn elf64_newehdr
functions.
.Pp
The
.Dq "Program Header Table"
associated with an ELF descriptor may be allocated using the
.Fn elf32_getphdr
or
.Fn elf64_getphdr
functions.
A new program header table may be allocated or an existing table
resized using the
.Fn elf32_newphdr
or
.Fn elf64_newphdr
functions.
.Pp
The
.Vt Elf
structure is opaque and has no members visible to the
application.
.\" TODO describe the Elf_Arhdr and Elf_Arsym structures.
.It Vt Elf_Data
An
.Vt Elf_Data
data structure describes an individual chunk of a ELF file as
represented in memory.
It has the following application visible members:
.Bl -tag -width ".Vt unsigned int d_version" -compact
.It Vt "uint64_t d_align"
The in-file alignment of the data buffer within its containing ELF section.
This value must be a power of two.
.It Vt "uint64_t d_off"
The offset with the containing section where this descriptors data
would be placed.
This field will be computed by the library unless the application
requests full control of the ELF object's layout.
.It Vt "uint64_t d_size"
The number of bytes of data in this descriptor.
.It Vt "void *d_buf"
A pointer to data in memory.
.It Vt "Elf_Type d_type"
The ELF type (see below) of the data in this descriptor.
.It Vt "unsigned int d_version"
The operating version for the data in this buffer.
.El
.Pp
.Vt Elf_Data
descriptors are usually associated with
.Vt Elf_Scn
descriptors.
Existing data descriptors associated with an ELF section may be
structures are retrieved using the
.Fn elf_getdata
function.
The
.Fn elf_newdata
function may be used to attach new data descriptors to an ELF section.
.It Vt Elf_Scn
.Vt Elf_Scn
descriptors represent a section in an ELF object.
.Pp
They are retrieved using the
.Fn elf_getscn
function.
An application may iterate through the existing sections of an ELF
object using the
.Fn elf_nextscn
function.
New sections may be allocated using the
.Fn elf_newscn
function.
.Pp
The
.Vt Elf_Scn
descriptor is opaque and contains no application modifiable fields.
.El
.Ss Supported Elf Types
The following ELF datatypes are supported by the library.
.Pp
.Bl -tag -width ".Dv ELF_T_SYMINFO" -compact
.It Dv ELF_T_ADDR
Machine addresses.
.It Dv ELF_T_BYTE
Byte data.
The library will not attempt to translate byte data.
.It Dv ELF_T_CAP
Software and hardware capability records.
.It Dv ELF_T_DYN
Records used in a section of type
.Dv SHT_DYNAMIC .
.It Dv ELF_T_EHDR
ELF executable header.
.It Dv ELF_T_HALF
16-bit unsigned words.
.It Dv ELF_T_LWORD
64 bit unsigned words.
.It Dv ELF_T_MOVE
ELF Move records.
.\".It Dv ELF_T_MOVEP
.\" As yet unsupported.
.It Dv ELF_T_NOTE
ELF Note structures.
.It Dv ELF_T_OFF
File offsets.
.It Dv ELF_T_PHDR
ELF program header table entries.
.It Dv ELF_T_REL
ELF relocation entries.
.It Dv ELF_T_RELA
ELF relocation entries with addends.
.It Dv ELF_T_SHDR
ELF section header entries.
.It Dv ELF_T_SWORD
Signed 32-bit words.
.It Dv ELF_T_SXWORD
Signed 64-bit words.
.It Dv ELF_T_SYMINFO
ELF symbol information.
.It Dv ELF_T_SYM
ELF symbol table entries.
.It Dv ELF_T_VDEF
Symbol version definition records.
.It Dv ELF_T_VNEED
Symbol version requirement records.
.It Dv ELF_T_WORD
Unsigned 32-bit words.
.It Dv ELF_T_XWORD
Unsigned 64-bit words.
.El
.Pp
The symbol
.Dv ELF_T_NUM
denotes the number of Elf types known to the library.
.Pp
The following table shows the mapping between ELF section types
defined in
.Xr elf 5
and the types supported by the library.
.Bl -column ".Dv SHT_PREINIT_ARRAY" ".Dv ELF_T_SYMINFO"
.It Em Section Type Ta Em "Library Type" Ta Em Description
.It Dv SHT_DYNAMIC Ta Dv ELF_T_DYN Ta Xo
.Sq .dynamic
section entries.
.Xc
.It Dv SHT_DYNSYM Ta Dv ELF_T_SYM Ta Symbols for dynamic linking.
.It Dv SHT_FINI_ARRAY Ta Dv ELF_T_ADDR Ta Termination function pointers.
.It Dv SHT_GROUP Ta Dv ELF_T_WORD Ta Section group marker.
.It Dv SHT_HASH Ta Dv ELF_T_HASH Ta Symbol hashes.
.It Dv SHT_INIT_ARRAY Ta Dv ELF_T_ADDR Ta Initialization function pointers.
.It Dv SHT_NOBITS Ta Dv ELF_T_BYTE Ta Xo
Empty sections.
See
.Xr elf 5 .
.Xc
.It Dv SHT_NOTE Ta Dv ELF_T_NOTE Ta ELF note records.
.It Dv SHT_PREINIT_ARRAY Ta Dv ELF_T_ADDR Ta Pre-initialization function pointers.
.It Dv SHT_PROGBITS Ta Dv ELF_T_BYTE Ta Machine code.
.It Dv SHT_REL Ta Dv ELF_T_REL Ta ELF relocation records.
.It Dv SHT_RELA Ta Dv ELF_T_RELA Ta Relocation records with addends.
.It Dv SHT_STRTAB Ta Dv ELF_T_BYTE Ta String tables.
.It Dv SHT_SYMTAB Ta Dv ELF_T_SYM Ta Symbol tables.
.It Dv SHT_SYMTAB_SHNDX Ta Dv ELF_T_WORD Ta Used with extended section numbering.
.It Dv SHT_GNU_verdef Ta Dv ELF_T_VDEF Ta Symbol version definitions.
.It Dv SHT_GNU_verneed Ta Dv ELF_T_VNEED Ta Symbol versioning requirements.
.It Dv SHT_GNU_versym Ta Dv ELF_T_HALF Ta Version symbols.
.It Dv SHT_SUNW_move Ta Dv ELF_T_MOVE Ta ELF move records.
.It Dv SHT_SUNW_syminfo Ta Dv ELF_T_SYMINFO Ta Additional symbol flags.
.El
.TE
.Ss Functional Grouping
This section contains a brief overview of the available functionality
in the ELF library.
Each function listed here is described further in its own manual page.
.Bl -tag -width indent
.It "Archive Access"
.Bl -tag -compact
.It Fn elf_getarsym
Retrieve the archive symbol table.
.It Fn elf_getarhdr
Retrieve the archive header for an object.
.It Fn elf_getbase
Retrieve the offset of a member inside an archive.
.It Fn elf_next
Iterate through an
.Xr ar 1
archive.
.It Fn elf_rand
Random access inside an
.Xr ar 1
archive.
.El
.It "Data Structures"
.Bl -tag -compact
.It Fn elf_getdata
Retrieve translated data for an ELF section.
.It Fn elf_getscn
Retrieve the section descriptor for a named section.
.It Fn elf_ndxscn
Retrieve the index for a section.
.It Fn elf_newdata
Add a new
.Vt Elf_Data
descriptor to an ELF section.
.It Fn elf_newscn
Add a new section descriptor to an ELF descriptor.
.It Fn elf_nextscn
Iterate through the sections in an ELF object.
.It Fn elf_rawdata
Retrieve untranslated data for an ELF sectino.
.It Fn elf_rawfile
Return a pointer to the untranslated file contents for an ELF object.
.It Fn elf32_getehdr , Fn elf64_getehdr
Retrieve the Executable Header in an ELF object.
.It Fn elf32_getphdr , Fn elf64_getphdr
Retrieve the Program Header Table in an ELF object.
.It Fn elf32_getshdr , Fn elf64_getshdr
Retrieve the ELF section header associated with an
.Vt Elf_Scn
descriptor.
.It Fn elf32_newehdr , Fn elf64_newehdr
Allocate an Executable Header in an ELF object.
.It Fn elf32_newphdr , Fn elf64_newphdr
Allocate or resize the Program Header Table in an ELF object.
.El
.It "Data Translation"
.Bl -tag -compact
.It Fn elf32_xlatetof , Fn elf64_xlatetof
Translate an ELF data structure from its native representation to its
file representation.
.It Fn elf32_xlatetom , Fn elf64_xlatetom
Translate an ELF data structure from its file representation to a
native representation.
.El
.It "Error Reporting"
.Bl -tag -compact
.It Fn elf_errno
Retrieve the current error.
.It Fn elf_errmsg
Retrieve a human readable description of the current error.
.El
.It "Initialization"
.Bl -tag -compact
.It Fn elf_begin
Opens an
.Xr ar 1
archive or ELF object given a file descriptor.
.It Fn elf_end
Close an ELF descriptor and release all its resources.
.It Fn elf_memory
Opens an
.Xr ar 1
archive or ELF object present in a memory arena.
.It Fn elf_version
Sets the operating version.
.El
.It "IO Control"
.Bl -tag -width ".Fn elf_setshstrndx" -compact
.It Fn elf_cntl
Manage the association between and ELF descriptor and its underlying file.
.It Fn elf_flagdata
Mark an
.Vt Elf_Data
descriptor as dirty.
.It Fn elf_flagehdr
Mark the ELF Executable Header in an ELF descriptor as dirty.
.It Fn elf_flagphdr
Mark the ELF Program Header Table in an ELF descriptor as dirty.
.It Fn elf_flagscn
Mark an
.Vt Elf_Scn
descriptor as dirty.
.It Fn elf_flagshdr
Mark an ELF Section Header as dirty.
.It Fn elf_setshstrndx
Set the index of the section name string table for the ELF object.
.It Fn elf_update
Recompute ELF object layout and optionally write the modified object
back to the underlying file.
.El
.It "Queries"
.Bl -tag -width ".Fn elf_getshstrndx" -compact
.It Fn elf32_checksum , Fn elf64_checkum
Compute checksum of an ELF object.
.It Fn elf_getident
Retrieve the identification bytes for an ELF object.
.It Fn elf_getshnum
Retrieve the number of sections in an ELF object.
.It Fn elf_getshstrndx
Retrieve the section index of the section name string table in
an ELF object.
.It Fn elf_hash
Compute the ELF hash value of a string.
.It Fn elf_kind
Query the kind of object associated with an ELF descriptor.
.It Fn elf32_fsize , Fn elf64_fsize
Return the size of the file representation of an ELF type.
.El
.El
.Ss Controlling ELF Object Layout
In the usual mode of operation, library will compute section
offsets and alignments based on the contents of an ELF descriptor's
sections without need for further intervention by the
application.
.Pp
However, if the application wishes to take complete charge of the
layout of the ELF file, it may set the
.Dv ELF_F_LAYOUT
flag on an ELF descriptor using
.Xr elf_flagelf 3 ,
following which the library will use the data offsets and alignments
specified by the application when laying out the file.
Application control of file layout is described further in the
.Xr elf_update 3
manual page.
.Pp
Gaps in between sections will be filled with the fill character
set by function
.Fn elf_fill .
.Ss Error Handling
In case an error is encountered, these library functions set an
internal error number and signal the presence of the error by
returning an special return value.
The application can check the
current error number by calling
.Xr elf_errno 3 .
A human readable description of the recorded error is available by
calling
.Xr elf_errmsg 3 .
.Ss Memory Management Rules
The library keeps track of all
.Vt Elf_Scn
and
.Vt Elf_Data
descriptors associated with an ELF descriptor and recovers them
when the descriptor is closed using
.Xr elf_end 3 .
Thus the application must not call
.Xr free 3
on data structures allocated by the ELF library.
.Pp
Conversely the library will not
free data that it has not allocated.
As an example, an application may call
.Xr elf_newdata 3
to allocate a new
.Vt Elf_Data
descriptor and can set the
.Va d_off
member of the descriptor to point to a region of memory allocated
using
.Xr malloc 3 .
It is the applications responsibility to free this arena, though the
library will reclaim the space used by the
.Vt Elf_Data
descriptor itself.
.Sh SEE ALSO
.Xr gelf 3 ,
.Xr elf 5
.Sh HISTORY
The original ELF(3) API was developed for Unix System V.
The current implementation of the ELF(3) API appeared in
.Fx 7.0 .
.Sh AUTHORS
The ELF library was written by
.An "Joseph Koshy"
.Aq jkoshy@FreeBSD.org .

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/*-
* Copyright (c) 2006,2008,2011 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
struct _libelf_globals _libelf = {
.libelf_arch = LIBELF_ARCH,
.libelf_byteorder = LIBELF_BYTEORDER,
.libelf_class = LIBELF_CLASS,
.libelf_error = 0,
.libelf_fillchar = 0,
.libelf_version = EV_NONE
};

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd April 11, 2010
.Os
.Dt ELF_BEGIN 3
.Sh NAME
.Nm elf_begin
.Nd open an ELF file or ar(1) archive
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft "Elf *"
.Fn elf_begin "int fd" "Elf_Cmd cmd" "Elf *elf"
.Sh DESCRIPTION
Function
.Fn elf_begin
is used to open ELF files and
.Xr ar 1
archives for further processing by other APIs in the
.Xr elf 3
library.
It is also used to access individual ELF members of an
.Xr ar 1
archive in combination with the
.Xr elf_next 3
and
.Xr elf_rand 3
APIs.
.Pp
Argument
.Ar fd
is an open file descriptor returned from an
.Xr open 2
system call.
Function
.Fn elf_begin
uses argument
.Ar fd
for reading or writing depending on the value of argument
.Ar cmd .
Argument
.Ar elf
is primarily used for iterating through archives.
.Pp
The argument
.Ar cmd
can have the following values:
.Bl -tag -width "ELF_C_WRITE"
.It ELF_C_NULL
Causes
.Fn elf_begin
to return NULL.
Arguments
.Ar fd
and
.Ar elf
are ignored, and no additional error is signalled.
.It ELF_C_READ
This value is to be when the application wishes to examine (but not
modify) the contents of the file specified by argument
.Ar fd .
It can be used for both
.Xr ar 1
archives and for regular ELF files.
.Pp
Argument
.Ar fd
should have been opened for reading.
If argument
.Ar elf
is NULL, the library will allocate a new ELF descriptor for
the file being processed.
If argument
.Ar elf
is not NULL, and references a regular ELF file previously opened with
.Fn elf_begin ,
then the activation count for
.Ar elf
is incremented.
If argument
.Ar elf
is not NULL, and references a descriptor for an
.Xr ar 1
archive opened earlier with
.Fn elf_begin ,
a descriptor for an element in the archive is returned as
described in the section
.Sx "Processing ar(1) archives"
below.
.It Dv ELF_C_RDWR
The command is used to prepare an ELF file for reading and writing.
It is not supported for archives.
.Pp
Argument
.Ar fd
should have been opened for reading and writing.
If argument
.Ar elf
is NULL, the library will allocate a new ELF descriptor for
the file being processed.
If the argument
.Ar elf
is non-null, it should point to a descriptor previously
allocated with
.Fn elf_begin
with the same values for arguments
.Ar fd
and
.Ar cmd ;
in this case the library will increment the activation count for descriptor
.Ar elf
and return the same descriptor.
Changes to the in-memory image of the ELF file are written back to
disk using the
.Xr elf_update 3
function.
.Pp
This command is not valid for
.Xr ar 1
archives.
.It Dv ELF_C_WRITE
This command is used when the application wishes to create a new ELF
file.
Argument
.Ar fd
should have been opened for writing.
Argument
.Ar elf
is ignored, and the previous contents of file referenced by
argument
.Ar fd
are overwritten.
.El
.Ss Processing ar(1) archives
An
.Xr ar 1
archive may be opened in read mode (with argument
.Ar cmd
set to
.Dv ELF_C_READ )
using
.Fn elf_begin
or
.Fn elf_memory .
The returned ELF descriptor can be passed into to
subsequent calls to
.Fn elf_begin
to access individual members of the archive.
.Pp
Random access within an opened archive is possible using
the
.Xr elf_next 3
and
.Xr elf_rand 3
functions.
.Pp
The symbol table of the archive may be retrieved
using
.Xr elf_getarsym 3 .
.Sh RETURN VALUES
The function returns a pointer to a ELF descriptor if successful, or NULL
if an error occurred.
.Sh EXAMPLES
To iterate through the members of an
.Xr ar 1
archive, use:
.Bd -literal -offset indent
Elf_Cmd c;
Elf *ar_e, *elf_e;
\&...
c = ELF_C_READ;
if ((ar_e = elf_begin(fd, c, (Elf *) 0)) == 0) {
\&... handle error in opening the archive ...
}
while ((elf_e = elf_begin(fd, c, ar_e)) != 0) {
\&... process member referenced by elf_e here ...
c = elf_next(elf_e);
elf_end(elf_e);
}
.Ed
.Pp
To create a new ELF file, use:
.Bd -literal -offset indent
int fd;
Elf *e;
\&...
if ((fd = open("filename", O_RDWR|O_TRUNC|O_CREAT, 0666)) < 0) {
\&... handle the error from open(2) ...
}
if ((e = elf_begin(fd, ELF_C_WRITE, (Elf *) 0)) == 0) {
\&... handle the error from elf_begin() ...
}
\&... create the ELF image using other elf(3) APIs ...
elf_update(e, ELF_C_WRITE);
elf_end(e);
.Ed
.Sh ERRORS
Function
.Fn elf_begin
can fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARCHIVE
The archive denoted by argument
.Ar elf
could not be parsed.
.It Bq Er ELF_E_ARGUMENT
An unrecognized value was specified in argument
.Ar cmd .
.It Bq Er ELF_E_ARGUMENT
A non-null value for argument
.Ar elf
was specified when
.Ar cmd
was set to
.Dv ELF_C_RDWR .
.It Bq Er ELF_E_ARGUMENT
The value of argument
.Ar fd
differs from the one the ELF descriptor
.Ar elf
was created with.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar cmd
differs from the value specified when ELF descriptor
.Ar elf
was created.
.It Bq Er ELF_E_ARGUMENT
An
.Xr ar 1
archive was opened with with
.Ar cmd
set to
.Dv ELF_C_RDWR .
.It Bq Er ELF_E_IO
Function
.Fn elf_begin
was unable to truncate a file opened for writing using
.Dv ELF_C_WRITE .
.It Bq Er ELF_E_RESOURCE
An out of memory condition was encountered.
.It Bq Er ELF_E_SEQUENCE
Function
.Fn elf_begin
was called before a working version was established with
.Xr elf_version 3 .
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_end 3 ,
.Xr elf_errno 3 ,
.Xr elf_memory 3 ,
.Xr elf_next 3 ,
.Xr elf_rand 3 ,
.Xr elf_update 3 ,
.Xr gelf 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/errno.h>
#if 0
#include <sys/mman.h>
#endif
#include <sys/stat.h>
#include <ar.h>
#include <ctype.h>
#include <errno.h>
#include <libelf.h>
#include <unistd.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
static Elf *
_libelf_open_object(int fd, Elf_Cmd c)
{
Elf *e;
void *m;
struct stat sb;
/*
* 'Raw' files are always mapped with 'PROT_READ'. At
* elf_update(3) time for files opened with ELF_C_RDWR the
* mapping is unmapped, file data is written to using write(2)
* and then the raw data is immediately mapped back in.
*/
if (fstat(fd, &sb) < 0) {
LIBELF_SET_ERROR(IO, errno);
return (NULL);
}
m = NULL;
if ((m = mmap(NULL, (size_t) sb.st_size, PROT_READ, MAP_PRIVATE, fd,
(off_t) 0)) == MAP_FAILED) {
LIBELF_SET_ERROR(IO, errno);
return (NULL);
}
if ((e = elf_memory(m, (size_t) sb.st_size)) == NULL) {
(void) munmap(m, (size_t) sb.st_size);
return (NULL);
}
e->e_flags |= LIBELF_F_MMAP;
e->e_fd = fd;
e->e_cmd = c;
if (c == ELF_C_RDWR && e->e_kind == ELF_K_AR) {
(void) elf_end(e);
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
return (e);
}
Elf *
elf_begin(int fd, Elf_Cmd c, Elf *a)
{
Elf *e;
e = NULL;
if (LIBELF_PRIVATE(version) == EV_NONE) {
LIBELF_SET_ERROR(SEQUENCE, 0);
return (NULL);
}
switch (c) {
case ELF_C_NULL:
return (NULL);
case ELF_C_WRITE:
if (a != NULL) { /* not allowed for ar(1) archives. */
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
/*
* Check writeability of `fd' immediately and fail if
* not writeable.
*/
if (ftruncate(fd, (off_t) 0) < 0) {
LIBELF_SET_ERROR(IO, errno);
return (NULL);
}
if ((e = _libelf_allocate_elf()) != NULL) {
_libelf_init_elf(e, ELF_K_ELF);
e->e_byteorder = LIBELF_PRIVATE(byteorder);
e->e_fd = fd;
e->e_cmd = c;
}
return (e);
case ELF_C_RDWR:
if (a != NULL) { /* not allowed for ar(1) archives. */
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
/*FALLTHROUGH*/
case ELF_C_READ:
/*
* Descriptor `a' could be for a regular ELF file, or
* for an ar(1) archive. If descriptor `a' was opened
* using a valid file descriptor, we need to check if
* the passed in `fd' value matches the original one.
*/
if (a &&
((a->e_fd != -1 && a->e_fd != fd) || c != a->e_cmd)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
break;
default:
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if (a == NULL)
e = _libelf_open_object(fd, c);
else if (a->e_kind == ELF_K_AR)
e = _libelf_ar_open_member(a->e_fd, c, a);
else
(e = a)->e_activations++;
return (e);
}

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 9, 2006
.Os
.Dt ELF_CNTL 3
.Sh NAME
.Nm elf_cntl
.Nd control an elf file descriptor
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft int
.Fn elf_cntl "Elf *elf" "Elf_Cmd cmd"
.Sh DESCRIPTION
Function
.Fn elf_cntl
controls the ELF library's subsequent use of the file descriptor
used to create ELF descriptor
.Ar elf .
.Pp
Argument
.Ar cmd
informs the library of the action to be taken:
.Bl -tag -width "ELF_C_FDDONE"
.It Dv ELF_C_FDDONE
This value instructs the ELF library not to perform any further
I/O on the file descriptor associated with argument
.Ar elf .
For ELF descriptors opened with mode
.Ar ELF_C_WRITE
or
.Ar ELF_C_RDWR
subsequent
.Fn elf_update
operations on the descriptor will fail.
.It Dv ELF_C_FDREAD
This value instructs the ELF library to read in all necessary
data associated with ELF descriptor
.Ar elf
into memory so that the underlying file descriptor can be
safely closed with command
.Dv ELF_C_FDDONE .
.El
.Pp
Argument
.Ar elf
must be an ELF descriptor associated with a file system object
(e.g., an
.Xr ar 1
archive, an ELF file, or other data file).
.Sh IMPLEMENTATION NOTES
Due to use of
.Xr mmap 2
internally, this function is a no-op for ELF objects opened in
.Dv ELF_C_READ
mode.
.Sh RETURN VALUES
Function
.Fn elf_cntl
returns 0 on success, or -1 if an error was detected.
.Sh ERRORS
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARCHIVE
Argument
.Ar elf
is a descriptor for an archive member.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar cmd
was not recognized.
.It Bq Er ELF_E_MODE
An
.Dv ELF_C_FDREAD
operation was requested on an ELF descriptor opened
for writing.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_begin 3 ,
.Xr elf_end 3 ,
.Xr elf_next 3 ,
.Xr elf_update 3 ,
.Xr gelf 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
int
elf_cntl(Elf *e, Elf_Cmd c)
{
if (e == NULL ||
(c != ELF_C_FDDONE && c != ELF_C_FDREAD)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (-1);
}
if (e->e_parent) {
LIBELF_SET_ERROR(ARCHIVE, 0);
return (-1);
}
if (c == ELF_C_FDREAD) {
if (e->e_cmd == ELF_C_WRITE) {
LIBELF_SET_ERROR(MODE, 0);
return (-1);
}
else
return (0);
}
e->e_fd = -1;
return 0;
}

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/*-
* Copyright (c) 2006,2008,2011 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <assert.h>
#include <errno.h>
#include <libelf.h>
#include <stdlib.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
Elf_Data *
elf_getdata(Elf_Scn *s, Elf_Data *d)
{
Elf *e;
size_t fsz, msz, count;
int elfclass, elftype;
unsigned int sh_type;
uint64_t sh_align, sh_offset, sh_size;
int (*xlate)(char *_d, size_t _dsz, char *_s, size_t _c, int _swap);
if (s == NULL || (e = s->s_elf) == NULL ||
(d != NULL && s != d->d_scn)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
assert(e->e_kind == ELF_K_ELF);
if (d == NULL && (d = STAILQ_FIRST(&s->s_data)) != NULL)
return (d);
if (d != NULL)
return (STAILQ_NEXT(d, d_next));
if (e->e_rawfile == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
elfclass = e->e_class;
assert(elfclass == ELFCLASS32 || elfclass == ELFCLASS64);
if (elfclass == ELFCLASS32) {
sh_type = s->s_shdr.s_shdr32.sh_type;
sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset;
sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size;
sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign;
} else {
sh_type = s->s_shdr.s_shdr64.sh_type;
sh_offset = s->s_shdr.s_shdr64.sh_offset;
sh_size = s->s_shdr.s_shdr64.sh_size;
sh_align = s->s_shdr.s_shdr64.sh_addralign;
}
if (sh_type == SHT_NULL)
return (NULL);
if ((elftype = _libelf_xlate_shtype(sh_type)) < ELF_T_FIRST ||
elftype > ELF_T_LAST || (sh_type != SHT_NOBITS &&
sh_offset + sh_size > (uint64_t) e->e_rawsize)) {
LIBELF_SET_ERROR(SECTION, 0);
return (NULL);
}
if ((fsz = (elfclass == ELFCLASS32 ? elf32_fsize : elf64_fsize)
(elftype, (size_t) 1, e->e_version)) == 0) {
LIBELF_SET_ERROR(UNIMPL, 0);
return (NULL);
}
if (sh_size % fsz) {
LIBELF_SET_ERROR(SECTION, 0);
return (NULL);
}
count = sh_size / fsz;
msz = _libelf_msize(elftype, elfclass, e->e_version);
assert(msz > 0);
if ((d = _libelf_allocate_data(s)) == NULL)
return (NULL);
d->d_buf = NULL;
d->d_off = 0;
d->d_align = sh_align;
d->d_size = msz * count;
d->d_type = elftype;
d->d_version = e->e_version;
if (sh_type == SHT_NOBITS || sh_size == 0) {
STAILQ_INSERT_TAIL(&s->s_data, d, d_next);
return (d);
}
if ((d->d_buf = malloc(msz*count)) == NULL) {
(void) _libelf_release_data(d);
LIBELF_SET_ERROR(RESOURCE, 0);
return (NULL);
}
d->d_flags |= LIBELF_F_DATA_MALLOCED;
xlate = _libelf_get_translator(elftype, ELF_TOMEMORY, elfclass);
if (!(*xlate)(d->d_buf, d->d_size, e->e_rawfile + sh_offset, count,
e->e_byteorder != LIBELF_PRIVATE(byteorder))) {
_libelf_release_data(d);
LIBELF_SET_ERROR(DATA, 0);
return (NULL);
}
STAILQ_INSERT_TAIL(&s->s_data, d, d_next);
return (d);
}
Elf_Data *
elf_newdata(Elf_Scn *s)
{
Elf *e;
Elf_Data *d;
if (s == NULL || (e = s->s_elf) == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
assert(e->e_kind == ELF_K_ELF);
/*
* elf_newdata() has to append a data descriptor, so
* bring in existing section data if not already present.
*/
if (e->e_rawfile && s->s_size > 0 && STAILQ_EMPTY(&s->s_data))
if (elf_getdata(s, NULL) == NULL)
return (NULL);
if ((d = _libelf_allocate_data(s)) == NULL)
return (NULL);
STAILQ_INSERT_TAIL(&s->s_data, d, d_next);
d->d_align = 1;
d->d_buf = NULL;
d->d_off = (uint64_t) ~0;
d->d_size = 0;
d->d_type = ELF_T_BYTE;
d->d_version = LIBELF_PRIVATE(version);
(void) elf_flagscn(s, ELF_C_SET, ELF_F_DIRTY);
return (d);
}
/*
* Retrieve a data descriptor for raw (untranslated) data for section
* `s'.
*/
Elf_Data *
elf_rawdata(Elf_Scn *s, Elf_Data *d)
{
Elf *e;
int elf_class;
uint32_t sh_type;
uint64_t sh_align, sh_offset, sh_size;
if (s == NULL || (e = s->s_elf) == NULL || e->e_rawfile == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
assert(e->e_kind == ELF_K_ELF);
if (d == NULL && (d = STAILQ_FIRST(&s->s_rawdata)) != NULL)
return (d);
if (d != NULL)
return (STAILQ_NEXT(d, d_next));
elf_class = e->e_class;
assert(elf_class == ELFCLASS32 || elf_class == ELFCLASS64);
if (elf_class == ELFCLASS32) {
sh_type = s->s_shdr.s_shdr32.sh_type;
sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset;
sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size;
sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign;
} else {
sh_type = s->s_shdr.s_shdr64.sh_type;
sh_offset = s->s_shdr.s_shdr64.sh_offset;
sh_size = s->s_shdr.s_shdr64.sh_size;
sh_align = s->s_shdr.s_shdr64.sh_addralign;
}
if (sh_type == SHT_NULL)
return (NULL);
if ((d = _libelf_allocate_data(s)) == NULL)
return (NULL);
d->d_buf = (sh_type == SHT_NOBITS || sh_size == 0) ? NULL :
e->e_rawfile + sh_offset;
d->d_off = 0;
d->d_align = sh_align;
d->d_size = sh_size;
d->d_type = ELF_T_BYTE;
d->d_version = e->e_version;
STAILQ_INSERT_TAIL(&s->s_rawdata, d, d_next);
return (d);
}

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd June 29, 2006
.Os
.Dt ELF_END 3
.Sh NAME
.Nm elf_end
.Nd release an ELF descriptor
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft int
.Fn elf_end "Elf *elf"
.Sh DESCRIPTION
Function
.Fn elf_end
is used to release the resources associated with an ELF descriptor
pointed to by argument
.Ar elf .
This descriptor must have been allocated by a previous call to
.Xr elf_begin 3
or
.Xr elf_memory 3 .
For programming convenience, a NULL value is permitted for argument
.Ar elf .
.Pp
A call to
.Fn elf_end
decrements the activation count for descriptor
.Ar elf
by one.
The resources associated with the descriptor are only released
with its activation count goes to zero.
.Pp
Once function
.Fn elf_end
returns zero, the ELF descriptor
.Ar elf
will no longer be valid and should not be used further.
.Sh RETURN VALUES
Function
.Fn elf_end
returns the current value of the ELF descriptor
.Ar elf Ap s
activation count, or zero if argument
.Ar elf
was NULL.
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_begin 3 ,
.Xr elf_memory 3 ,
.Xr gelf 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if 0
#include <sys/mman.h>
#endif
#include <assert.h>
#include <libelf.h>
#include <stdlib.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
int
elf_end(Elf *e)
{
Elf *sv;
Elf_Scn *scn, *tscn;
if (e == NULL || e->e_activations == 0)
return (0);
if (--e->e_activations > 0)
return (e->e_activations);
assert(e->e_activations == 0);
while (e && e->e_activations == 0) {
switch (e->e_kind) {
case ELF_K_AR:
/*
* If we still have open child descriptors, we
* need to defer reclaiming resources till all
* the child descriptors for the archive are
* closed.
*/
if (e->e_u.e_ar.e_nchildren > 0)
return (0);
break;
case ELF_K_ELF:
/*
* Reclaim all section descriptors.
*/
STAILQ_FOREACH_SAFE(scn, &e->e_u.e_elf.e_scn, s_next, tscn)
scn = _libelf_release_scn(scn);
break;
case ELF_K_NUM:
assert(0);
default:
break;
}
if (e->e_flags & LIBELF_F_MMAP)
(void) munmap(e->e_rawfile, e->e_rawsize);
sv = e;
if ((e = e->e_parent) != NULL)
e->e_u.e_ar.e_nchildren--;
sv = _libelf_release_elf(sv);
}
return (0);
}

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd June 11, 2006
.Os
.Dt ELF_ERRMSG 3
.Sh NAME
.Nm elf_errmsg ,
.Nm elf_errno
.Nd ELF library error message handling
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft int
.Fn elf_errno "void"
.Ft "const char *"
.Fn elf_errmsg "int error"
.Sh DESCRIPTION
When an error occurs during an ELF library API call, the library
encodes the error using an error number and stores the error number
internally for retrieval by the application at a later point of time.
Error numbers may contain an OS supplied error code in addition to
an ELF API specific error code.
An error number value of zero indicates no error.
.Pp
Function
.Fn elf_errno
is used to retrieve the last error recorded by the ELF library.
Invoking this function has the side-effect of resetting the
ELF library's recorded error number to zero.
.Pp
The function
.Fn elf_errmsg
returns a null-terminated string with a human readable
description of the error specified in argument
.Ar error .
A zero value for argument
.Ar error
retrieves the most recent error encountered by the ELF
library.
An argument value of -1 behaves identically, except that
it guarantees a non-NULL return from
.Fn elf_errmsg .
.Sh RETURN VALUES
Function
.Fn elf_errno
returns a non-zero value encoding the last error encountered
by the ELF library, or zero if no error was encountered.
.Pp
Function
.Fn elf_errmsg
returns a pointer to library local storage for non-zero values
of argument
.Ar error .
With a zero argument, the function will return a NULL pointer if no
error had been encountered by the library, or will return a pointer to
library local storage containing an appropriate message otherwise.
.Sh EXAMPLES
Clearing the ELF library's recorded error number can be accomplished
by invoking
.Fn elf_errno
and discarding its return value.
.Bd -literal -offset indent
/* clear error */
(void) elf_errno();
.Ed
.Pp
Retrieving a human-readable description of the current error number
can be done with the following snippet:
.Bd -literal -offset indent
int err;
const char *errmsg;
\&...
err = elf_errno();
if (err != 0)
errmsg = elf_errmsg(err);
.Ed
.Sh SEE ALSO
.Xr elf 3 ,
.Xr gelf 3
.Sh BUGS
Function
.Fn elf_errmsg
is not localized.

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/*-
* Copyright (c) 2006,2008,2011 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <libelf.h>
#include <stdio.h>
#include <string.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
/*
* Retrieve a human readable translation for an error message.
*/
const char *_libelf_errors[] = {
#define DEFINE_ERROR(N,S) [ELF_E_##N] = S
DEFINE_ERROR(NONE, "No Error"),
DEFINE_ERROR(ARCHIVE, "Malformed ar(1) archive"),
DEFINE_ERROR(ARGUMENT, "Invalid argument"),
DEFINE_ERROR(CLASS, "ELF class mismatch"),
DEFINE_ERROR(DATA, "Invalid data buffer descriptor"),
DEFINE_ERROR(HEADER, "Missing or malformed ELF header"),
DEFINE_ERROR(IO, "I/O error"),
DEFINE_ERROR(LAYOUT, "Layout constraint violation"),
DEFINE_ERROR(MODE, "Incorrect ELF descriptor mode"),
DEFINE_ERROR(RANGE, "Value out of range of target"),
DEFINE_ERROR(RESOURCE, "Resource exhaustion"),
DEFINE_ERROR(SECTION, "Invalid section descriptor"),
DEFINE_ERROR(SEQUENCE, "API calls out of sequence"),
DEFINE_ERROR(UNIMPL, "Unimplemented feature"),
DEFINE_ERROR(VERSION, "Unknown ELF API version"),
DEFINE_ERROR(NUM, "Unknown error")
#undef DEFINE_ERROR
};
const char *
elf_errmsg(int error)
{
int oserr;
if (error == ELF_E_NONE &&
(error = LIBELF_PRIVATE(error)) == 0)
return NULL;
else if (error == -1)
error = LIBELF_PRIVATE(error);
oserr = error >> LIBELF_OS_ERROR_SHIFT;
error &= LIBELF_ELF_ERROR_MASK;
if (error < ELF_E_NONE || error >= ELF_E_NUM)
return _libelf_errors[ELF_E_NUM];
if (oserr) {
(void) snprintf(LIBELF_PRIVATE(msg),
sizeof(LIBELF_PRIVATE(msg)), "%s: %s",
_libelf_errors[error], strerror(oserr));
return (const char *)&LIBELF_PRIVATE(msg);
}
return _libelf_errors[error];
}

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/*-
* Copyright (c) 2006,2008,2011 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
int
elf_errno(void)
{
int old;
old = LIBELF_PRIVATE(error);
LIBELF_PRIVATE(error) = 0;
return (old & LIBELF_ELF_ERROR_MASK);
}

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd June 11, 2006
.Os
.Dt ELF_FILL 3
.Sh NAME
.Nm elf_fill
.Nd set fill byte for inter-section padding
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft void
.Fn elf_fill "int fill"
.Sh DESCRIPTION
Function
.Fn elf_fill
allows an application to specify a fill value for the padding inserted
between two sections of an ELF file to meet section alignment
constraints.
By default the ELF library uses zero bytes for padding.
.Pp
The ELF library will only pad bytes if the
.Dv ELF_F_LAYOUT
flag is not set for the ELF file.
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_flagelf 3 ,
.Xr gelf 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
void
elf_fill(int fill)
{
LIBELF_PRIVATE(fillchar) = fill;
}

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
unsigned int
elf_flagarhdr(Elf_Arhdr *a, Elf_Cmd c, unsigned int flags)
{
unsigned int r;
if (a == NULL)
return (0);
if ((c != ELF_C_SET && c != ELF_C_CLR) ||
(flags & ~ELF_F_DIRTY) != 0) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if (c == ELF_C_SET)
r = a->ar_flags |= flags;
else
r = a->ar_flags &= ~flags;
return (r);
}
unsigned int
elf_flagdata(Elf_Data *d, Elf_Cmd c, unsigned int flags)
{
Elf *e;
Elf_Scn *scn;
unsigned int r;
if (d == NULL)
return (0);
if ((c != ELF_C_SET && c != ELF_C_CLR) || (scn = d->d_scn) == NULL ||
(e = scn->s_elf) == NULL || e->e_kind != ELF_K_ELF ||
(flags & ~ELF_F_DIRTY) != 0) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if (c == ELF_C_SET)
r = scn->s_flags |= flags;
else
r = scn->s_flags &= ~flags;
return (r);
}
unsigned int
elf_flagehdr(Elf *e, Elf_Cmd c, unsigned int flags)
{
int ec;
void *ehdr;
if (e == NULL)
return (0);
if ((c != ELF_C_SET && c != ELF_C_CLR) ||
(e->e_kind != ELF_K_ELF) || (flags & ~ELF_F_DIRTY) != 0 ||
((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if (ec == ELFCLASS32)
ehdr = e->e_u.e_elf.e_ehdr.e_ehdr32;
else
ehdr = e->e_u.e_elf.e_ehdr.e_ehdr64;
if (ehdr == NULL) {
LIBELF_SET_ERROR(SEQUENCE, 0);
return (0);
}
return (elf_flagelf(e, c, flags));
}
unsigned int
elf_flagelf(Elf *e, Elf_Cmd c, unsigned int flags)
{
int r;
if (e == NULL)
return (0);
if ((c != ELF_C_SET && c != ELF_C_CLR) ||
(e->e_kind != ELF_K_ELF) ||
(flags & ~(ELF_F_ARCHIVE | ELF_F_ARCHIVE_SYSV |
ELF_F_DIRTY | ELF_F_LAYOUT)) != 0) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if ((flags & ELF_F_ARCHIVE_SYSV) && (flags & ELF_F_ARCHIVE) == 0) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if ((flags & ELF_F_ARCHIVE) && e->e_cmd != ELF_C_WRITE) {
LIBELF_SET_ERROR(MODE, 0);
return (0);
}
if (c == ELF_C_SET)
r = e->e_flags |= flags;
else
r = e->e_flags &= ~flags;
return (r);
}
unsigned int
elf_flagphdr(Elf *e, Elf_Cmd c, unsigned int flags)
{
int ec;
void *phdr;
if (e == NULL)
return (0);
if ((c != ELF_C_SET && c != ELF_C_CLR) ||
(e->e_kind != ELF_K_ELF) || (flags & ~ELF_F_DIRTY) != 0 ||
((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if (ec == ELFCLASS32)
phdr = e->e_u.e_elf.e_phdr.e_phdr32;
else
phdr = e->e_u.e_elf.e_phdr.e_phdr64;
if (phdr == NULL) {
LIBELF_SET_ERROR(SEQUENCE, 0);
return (0);
}
return (elf_flagelf(e, c, flags));
}
unsigned int
elf_flagscn(Elf_Scn *s, Elf_Cmd c, unsigned int flags)
{
int r;
if (s == NULL)
return (0);
if ((c != ELF_C_SET && c != ELF_C_CLR) ||
(flags & ~ELF_F_DIRTY) != 0) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if (c == ELF_C_SET)
r = s->s_flags |= flags;
else
r = s->s_flags &= ~flags;
return (r);
}
unsigned int
elf_flagshdr(Elf_Scn *s, Elf_Cmd c, unsigned int flags)
{
return (elf_flagscn(s, c, flags));
}

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.\" Copyright (c) 2006-2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd October 22, 2007
.Os
.Dt ELF_FLAGDATA 3
.Sh NAME
.Nm elf_flagarhdr ,
.Nm elf_flagdata ,
.Nm elf_flagehdr ,
.Nm elf_flagelf ,
.Nm elf_flagphdr ,
.Nm elf_flagscn ,
.Nm elf_flagshdr
.Nd manipulate flags associated with ELF(3) data structures
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft "unsigned int"
.Fn elf_flagarhdr "Elf_Arhdr *arhdr" "Elf_Cmd cmd" "unsigned int flags"
.Ft "unsigned int"
.Fn elf_flagdata "Elf_Data *data" "Elf_Cmd cmd" "unsigned int flags"
.Ft "unsigned int"
.Fn elf_flagehdr "Elf *elf" "Elf_Cmd cmd" "unsigned int flags"
.Ft "unsigned int"
.Fn elf_flagelf "Elf *elf" "Elf_Cmd cmd" "unsigned int flags"
.Ft "unsigned int"
.Fn elf_flagphdr "Elf *elf" "Elf_Cmd cmd" "unsigned int flags"
.Ft "unsigned int"
.Fn elf_flagscn "Elf_Scn *scn" "Elf_Cmd cmd" "unsigned int flags"
.Ft "unsigned int"
.Fn elf_flagshdr "Elf_Scn *scn" "Elf_Cmd cmd" "unsigned int flags"
.Sh DESCRIPTION
These functions are used to query, set or reset flags on data
structures associated with an ELF file.
.Pp
Arguments
.Ar arhdr ,
.Ar data ,
.Ar elf
and
.Ar scn
denote the data structures whose flags need to be changed.
These values are allowed to be NULL to simplify error handling in
application code.
.Pp
Argument
.Ar cmd
may have the following values:
.Bl -tag -width ELF_C_SET
.It Dv ELF_C_CLR
The argument
.Ar flags
specifies the flags to be cleared.
.It Dv ELF_C_SET
The argument
.Ar flags
specifies the flags to be set.
.El
.Pp
The argument
.Ar flags
is allowed to have the following flags set:
.Bl -tag -width ELF_F_ARCHIVE_SYSV
.It Dv ELF_F_ARCHIVE
This flag is only valid with the
.Fn elf_flagelf
API.
It informs the library that the application desires to create an
.Xr ar 1
archive.
Argument
.Ar elf
should have been opened for writing using the
.Dv ELF_C_WRITE
command to function
.Fn elf_begin .
.It Dv ELF_F_ARCHIVE_SYSV
This flag is used in conjunction with the
.Dv ELF_F_ARCHIVE
flag to indicate that library should create archives that conform
to System V layout rules.
The default is to create BSD style archives.
.It Dv ELF_F_DIRTY
Mark the associated data structure as needing to be written back
to the underlying file.
A subsequent call to
.Xr elf_update 3
will resynchronize the library's internal data structures.
.It Dv ELF_F_LAYOUT
This flag is only valid with the
.Fn elf_flagelf
API.
It informs the library that the application will take
responsibility for the layout of the file and that the library is
not to insert any padding in between sections.
.El
.Pp
Marking a given data structure as
.Dq dirty
affects all of its contained elements.
Thus marking an ELF descriptor
.Ar elf
with
.Fn elf_flagelf "elf" "ELF_C_SET" "ELF_F_DIRTY"
means that the entire contents of the descriptor are
.Dq dirty .
.Pp
Using a value of zero for argument
.Ar flags
will return the current set of flags for the data structure being
queried.
.Sh RETURN VALUES
These functions return the updated flags is successful, and zero if
an error is detected.
.Sh COMPATIBILITY
The
.Fn elf_flagarhdr
function and the
.Dv ELF_F_ARCHIVE
and
.Dv ELF_F_ARCHIVE_SYSV
flags are an extension to the ELF(3) API.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
An unsupported value was used for the
.Ar cmd
argument.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar flags
had unsupported flags set.
.It Bq Er ELF_E_ARGUMENT
The argument
.Ar elf
was not a descriptor for an ELF object.
.It Bq Er ELF_E_MODE
The
.Dv ELF_F_ARCHIVE
flag was used with an ELF descriptor that had not been opened for writing.
.It Bq Er ELF_E_SEQUENCE
Function
.Fn elf_flagehdr
was called without an executable header being allocated.
.It Bq Er ELF_E_SEQUENCE
Function
.Fn elf_flagphdr
was called without a program header being allocated.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf32_newehdr 3 ,
.Xr elf32_newphdr 3 ,
.Xr elf32_newshdr 3 ,
.Xr elf64_newehdr 3 ,
.Xr elf64_newphdr 3 ,
.Xr elf64_newshdr 3 ,
.Xr elf_newdata 3 ,
.Xr elf_update 3 ,
.Xr gelf 3 ,
.Xr gelf_newehdr 3 ,
.Xr gelf_newphdr 3 ,
.Xr gelf_newshdr 3 ,
.Xr gelf_update_dyn 3 ,
.Xr gelf_update_move 3 ,
.Xr gelf_update_rel 3 ,
.Xr gelf_update_rela 3 ,
.Xr gelf_update_sym 3 ,
.Xr gelf_update_syminfo 3

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 15, 2006
.Os
.Dt ELF_GETARHDR 3
.Sh NAME
.Nm elf_getarhdr
.Nd retrieve ar(1) header for an archive member
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft "Elf_Arhdr *"
.Fn elf_getarhdr "Elf *elf"
.Sh DESCRIPTION
The
.Fn elf_getarhdr
function returns a pointer to an archive member header for
a descriptor
.Ar elf .
This descriptor must have been returned by a prior call to
.Xr elf_begin 3 ,
and must be a descriptor for a member inside an
.Xr ar 1
archive.
.Pp
Structure
.Vt Elf_Arhdr
includes the following members:
.Bl -tag -width indent
.It Vt "char *" Va ar_name
A pointer to a null terminated string containing the translated
name of the archive member.
.It Vt "char *" Va ar_rawname
A pointer to a null terminated string containing the untranslated
name for the archive member, including all
.Xr ar 1
formatting characters and trailing white space.
.It Vt time_t Va ar_date
The timestamp associated with the member.
.It Vt uid_t Va ar_uid
The uid of the creator of the member.
.It Vt gid_t Va ar_gid
The gid of the creator of the member.
.It Vt mode_t Va ar_mode
The file mode of the member.
.It Vt size_t Va ar_size
The size of the member in bytes.
.El
.Sh RETURN VALUES
This function returns a valid pointer to an
.Vt Elf_Arhdr
structure if successful, or NULL if an error is encountered.
.Sh ERRORS
Function
.Fn elf_getarhdr
may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not a descriptor for a member of an
.Xr ar 1
archive.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_begin 3 ,
.Xr elf_getarsym 3 ,
.Xr elf_memory 3

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/*-
* Copyright (c) 2006,2008,2010 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
Elf_Arhdr *
elf_getarhdr(Elf *e)
{
if (e == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if (e->e_flags & LIBELF_F_AR_HEADER)
return (e->e_hdr.e_arhdr);
return (_libelf_ar_gethdr(e));
}

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 15, 2006
.Os
.Dt ELF_GETARSYM 3
.Sh NAME
.Nm elf_getarsym
.Nd retrieve the symbol table of an archive
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft "Elf_Arsym *"
.Fn elf_getarsym "Elf *elf" "size_t *ptr"
.Sh DESCRIPTION
The function
.Fn elf_getarsym
retrieves the symbol table for an
.Xr ar 1
archive, if one is available.
.Pp
Argument
.Ar elf
should be a descriptor for an
.Xr ar 1
archive opened using
.Fn elf_begin
or
.Fn elf_memory .
.Pp
If the archive
.Ar elf
contains a symbol table with n entries, this function returns a
pointer to an array of n+1
.Vt Elf_Arsym
structures.
An
.Vt Elf_Arsym
structure has the following elements:
.Bl -tag -width indent -compact
.It Vt "char *" Va as_name
This structure member is a pointer to a null-terminated symbol name.
.It Vt "off_t" Va as_off
This structure member contains the byte offset from the beginning of the archive to
the header for the archive member.
This value is suitable for use with
.Xr elf_rand 3 .
.It Vt "unsigned long" Va as_hash
This structure member contains a portable hash value for the symbol
name, as computed by
.Xr elf_hash 3 .
.El
.Pp
The last entry of the returned array will have a NULL value for member
.Va as_name ,
a zero value for member
.Va as_off
and an illegal value of ~0UL for
.Va as_hash .
.Pp
If argument
.Ar ptr
is non-null, the
.Fn elf_getarsym
function will store the number of table entries returned (including the
sentinel entry at the end) into the location it points to.
.Sh RETURN VALUES
Function
.Fn elf_getarsym
returns a pointer to an array of
.Vt Elf_Arsym
structures if successful, or a NULL
pointer if an error was encountered.
.Pp
If argument
.Ar ptr
is non-null and there was no error, the library will store the
number of archive symbol entries returned into the location it
points to.
If argument
.Ar ptr
is non-null and an error was encountered, the library will
set the location pointed to by it to zero.
.Sh ERRORS
Function
.Fn elf_getarsym
may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not a descriptor for an
.Xr ar 1
archive.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_begin 3 ,
.Xr elf_getarhdr 3 ,
.Xr elf_hash 3 ,
.Xr elf_memory 3 ,
.Xr elf_next 3 ,
.Xr elf_rand 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
Elf_Arsym *
elf_getarsym(Elf *ar, size_t *ptr)
{
size_t n;
Elf_Arsym *symtab;
n = 0;
symtab = NULL;
if (ar == NULL || ar->e_kind != ELF_K_AR)
LIBELF_SET_ERROR(ARGUMENT, 0);
else if ((symtab = ar->e_u.e_ar.e_symtab) != NULL)
n = ar->e_u.e_ar.e_symtabsz;
else if (ar->e_u.e_ar.e_rawsymtab)
symtab = (ar->e_flags & LIBELF_F_AR_VARIANT_SVR4) ?
_libelf_ar_process_svr4_symtab(ar, &n) :
_libelf_ar_process_bsd_symtab(ar, &n);
else
LIBELF_SET_ERROR(ARCHIVE, 0);
if (ptr)
*ptr = n;
return (symtab);
}

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.\" Copyright (c) 2006,2008,2010 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd June 6, 2010
.Os
.Dt ELF_GETBASE 3
.Sh NAME
.Nm elf_getbase
.Nd get the base offset for an object file
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft off_t
.Fn elf_getbase "Elf *elf"
.Sh DESCRIPTION
Function
.Fn elf_getbase
returns the file offset to the first byte of the object referenced by ELF
descriptor
.Ar elf .
.Pp
For descriptors referencing members of archives, the returned offset is
the file offset of the member in its containing archive.
For descriptors to regular objects, the returned offset is (vacuously)
zero.
.Sh RETURN VALUES
Function
.Fn elf_getbase
returns a valid file offset if successful, or
.Pq Vt off_t
.Li -1
in case of an error.
.Sh ERRORS
Function
.Fn elf_getbase
may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was NULL.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_getarhdr 3 ,
.Xr elf_getident 3 ,
.Xr elf_rawfile 3 ,
.Xr gelf 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
off_t
elf_getbase(Elf *e)
{
if (e == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return ((off_t) -1);
}
if (e->e_parent == NULL)
return ((off_t) 0);
return ((off_t) ((uintptr_t) e->e_rawfile -
(uintptr_t) e->e_parent->e_rawfile));
}

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.\" Copyright (c) 2006,2008,2010-2011 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd January 26, 2011
.Os
.Dt ELF_GETDATA 3
.Sh NAME
.Nm elf_getdata ,
.Nm elf_newdata ,
.Nm elf_rawdata
.Nd iterate through or allocate section data
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft "Elf_Data *"
.Fn elf_getdata "Elf_Scn *scn" "Elf_Data *data"
.Ft "Elf_Data *"
.Fn elf_newdata "Elf_Scn *scn"
.Ft "Elf_Data *"
.Fn elf_rawdata "Elf_Scn *scn" "Elf_Data *data"
.Sh DESCRIPTION
These functions are used to access and manipulate data descriptors
associated with section descriptors.
Data descriptors used by the ELF library are described in
.Xr elf 3 .
.Pp
Function
.Fn elf_getdata
will return the next data descriptor associated with section descriptor
.Ar scn .
The returned data descriptor will be setup to contain translated data.
Argument
.Ar data
may be NULL, in which case the function returns the first data descriptor
associated with section
.Ar scn .
If argument
.Ar data
is not NULL, it must be a pointer to a data descriptor associated with
section descriptor
.Ar scn ,
and function
.Fn elf_getdata
will return a pointer to the next data descriptor for the section,
or NULL when the end of the section's descriptor list is reached.
.Pp
Function
.Fn elf_newdata
will allocate a new data descriptor and append it to the list of data
descriptors associated with section descriptor
.Ar scn .
The new data descriptor will be initialized as follows:
.Bl -tag -width "d_version" -compact -offset indent
.It Va d_align
Set to 1.
.It Va d_buf
Initialized to NULL.
.It Va d_off
Set to (off_t) -1.
This field is under application control if the
.Dv ELF_F_LAYOUT
flag was set on the ELF descriptor.
.It Va d_size
Set to zero.
.It Va d_type
Initialized to
.Dv ELF_T_BYTE .
.It Va d_version
Set to the current working version of the library, as set by
.Xr elf_version 3 .
.El
The application must set these values as appropriate before
calling
.Xr elf_update 3 .
Section
.Ar scn
must be associated with an ELF file opened for writing.
If the application has not requested full control of layout by
setting the
.Dv ELF_F_LAYOUT
flag on descriptor
.Ar elf ,
then the data referenced by the returned descriptor will be positioned
after the existing content of the section, honoring the file alignment
specified in member
.Va d_align .
On successful completion of a call to
.Fn elf_newdata ,
the ELF library will mark the section
.Ar scn
as
.Dq dirty .
.Pp
Function
.Fn elf_rawdata
is used to step through the data descriptors associated with
section
.Ar scn .
In contrast to function
.Fn elf_getdata ,
this function returns untranslated data.
If argument
.Ar data
is NULL, the first data descriptor associated with section
.Ar scn
is returned.
If argument
.Ar data
is not NULL, is must be a data descriptor associated with
section
.Ar scn ,
and function
.Fn elf_rawdata
will return the next data descriptor in the list, or NULL
if no further descriptors are present.
Function
.Fn elf_rawdata
always returns
.Vt Elf_Data
structures of type
.Dv ELF_T_BYTE .
.Ss Special handling of zero-sized and SHT_NOBITS sections
For sections of type
.Dv SHT_NOBITS,
and for zero-sized sections,
the functions
.Fn elf_getdata
and
.Fn elf_rawdata
return a pointer to a valid
.Vt Elf_Data
structure that has its
.Va d_buf
member set to NULL and its
.Va d_size
member set to the size of the section.
.Pp
If an application wishes to create a section of type
.Dv SHT_NOBITS ,
it should add a data buffer to the section using function
.Fn elf_newdata .
It should then set the
.Va d_buf
and
.Va d_size
members of the returned
.Vt Elf_Data
structure to NULL and the desired size of the section respectively.
.Sh RETURN VALUES
These functions return a valid pointer to a data descriptor if successful, or
NULL if an error occurs.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Either of arguments
.Ar scn
or
.Ar data
was NULL.
.It Bq Er ELF_E_ARGUMENT
The data descriptor referenced by argument
.Ar data
is not associated with section descriptor
.Ar scn .
.It Bq Er ELF_E_ARGUMENT
The section denoted by argument
.Ar scn
had no data associated with it.
.It Bq Er ELF_E_DATA
Retrieval of data from the underlying object failed.
.It Bq Er ELF_E_RESOURCE
An out of memory condition was detected.
.It Bq Er ELF_E_SECTION
The section type associated with section
.Ar scn
is not recognized by the library.
.It Bq Er ELF_E_SECTION
The size of the section
.Ar scn
is not a multiple of the file size for its section type.
.It Bq Er ELF_E_SECTION
The file offset for section
.Ar scn
is incorrect.
.It Bq Er ELF_E_UNIMPL
The section type associated with section
.Ar scn
is currently unsupported by the library.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_flagdata 3 ,
.Xr elf_flagscn 3 ,
.Xr elf_getscn 3 ,
.Xr elf_getshdr 3 ,
.Xr elf_newscn 3 ,
.Xr elf_rawfile 3 ,
.Xr elf_update 3 ,
.Xr elf_version 3 ,
.Xr gelf 3

83
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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd July 3, 2006
.Os
.Dt ELF_GETIDENT 3
.Sh NAME
.Nm elf_getident
.Nd return the initial bytes of a file
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft char *
.Fn elf_getident "Elf *elf" "size_t *sz"
.Sh DESCRIPTION
Function
.Fn elf_getident
returns a pointer to the initial bytes of the file for descriptor
.Ar elf .
.Pp
If argument
.Ar sz
is non-null, the size of the identification area returned is written
to the location pointed to by
.Ar sz .
This location is set to zero on errors.
.Sh RETURN VALUES
Function
.Fn elf_getident
will return a non-NULL pointer to the initial bytes of the file if
successful, or NULL if an error condition is detected.
.Sh ERRORS
Function
.Fn elf_getident
can fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
A NULL value was passed in for argument
.Ar elf .
.It Bq Er ELF_E_SEQUENCE
ELF descriptor
.Ar elf
was opened for writing and function
.Fn elf_getident
was called before a call to
.Xr elf_update 3 .
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf32_getehdr 3 ,
.Xr elf64_getehdr 3 ,
.Xr elf_getarhdr 3 ,
.Xr elf_getbase 3 ,
.Xr elf_getflags 3 ,
.Xr elf_kind 3 ,
.Xr elf_rawfile 3 ,
.Xr elf_update 3 ,
.Xr gelf 3 ,
.Xr gelf_getclass 3 ,
.Xr gelf_getehdr 3

68
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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <ar.h>
#include <assert.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
char *
elf_getident(Elf *e, size_t *sz)
{
if (e == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
goto error;
}
if (e->e_cmd == ELF_C_WRITE && e->e_rawfile == NULL) {
LIBELF_SET_ERROR(SEQUENCE, 0);
goto error;
}
assert(e->e_kind != ELF_K_AR || e->e_cmd == ELF_C_READ);
if (sz) {
if (e->e_kind == ELF_K_AR)
*sz = SARMAG;
else if (e->e_kind == ELF_K_ELF)
*sz = EI_NIDENT;
else
*sz = e->e_rawsize;
}
return ((char *) e->e_rawfile);
error:
if (sz)
*sz = 0;
return (NULL);
}

86
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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 5, 2009
.Os
.Dt ELF_GETPHDRNUM 3
.Sh NAME
.Nm elf_getphdrnum
.Nd return the number of program headers in an ELF file
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft int
.Fn elf_getphdrnum "Elf *elf" "size_t *phnum"
.Sh DESCRIPTION
Function
.Fn elf_getphdrnum
retrieves the number of ELF program headers associated with descriptor
.Ar elf
and stores it into the location pointed to by argument
.Ar phnum .
.Pp
This routine allows applications to uniformly process both normal ELF
objects and ELF objects that use extended numbering.
.Pp
.Sh RETURN VALUES
Function
.Fn elf_getphdrnum
returns a zero value if successful, or -1 in case of an error.
.Sh ERRORS
Function
.Fn elf_getphnum
can fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
A NULL value was passed in for argument
.Ar elf .
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not for an ELF file.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
lacks an ELF Executable Header.
.It Bq Er ELF_E_HEADER
The ELF Executable Header associated with argument
.Ar elf
was corrupt.
.It Bq Er ELF_E_SECTION
The section header at index
.Dv SHN_UNDEF
was corrupt.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf32_getehdr 3 ,
.Xr elf64_getehdr 3 ,
.Xr elf_getident 3 ,
.Xr elf_getshdrnum 3 ,
.Xr elf_getshdrstrndx 3 ,
.Xr gelf 3 ,
.Xr gelf_getehdr 3

93
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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 5, 2009
.Os
.Dt ELF_GETPHNUM 3
.Sh NAME
.Nm elf_getphnum
.Nd return the number of program headers in an ELF file
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft int
.Fn elf_getphnum "Elf *elf" "size_t *phnum"
.Sh DESCRIPTION
This function is deprecated.
Please use function
.Xr elf_getphdrnum 3
instead.
.Pp
Function
.Fn elf_getphnum
retrieves the number of ELF program headers associated with descriptor
.Ar elf
and stores it into the location pointed to by argument
.Ar phnum .
.Pp
This routine allows applications to uniformly process both normal ELF
objects and ELF objects that use extended numbering.
.Pp
.Sh RETURN VALUES
Function
.Fn elf_getphnum
returns a non-zero value if successful, or zero in case of an
error.
.Sh ERRORS
Function
.Fn elf_getphnum
can fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
A NULL value was passed in for argument
.Ar elf .
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not for an ELF file.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
lacks an ELF Executable Header.
.It Bq Er ELF_E_HEADER
The ELF Executable Header associated with argument
.Ar elf
was corrupt.
.It Bq Er ELF_E_SECTION
The section header at index
.Dv SHN_UNDEF
was corrupt.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf32_getehdr 3 ,
.Xr elf64_getehdr 3 ,
.Xr elf_getident 3 ,
.Xr elf_getphdrnum 3 ,
.Xr elf_getshdrnum 3 ,
.Xr elf_getshdrstrndx 3 ,
.Xr gelf 3 ,
.Xr gelf_getehdr 3

151
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.\" Copyright (c) 2006-2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd October 22, 2007
.Os
.Dt ELF_GETSCN 3
.Sh NAME
.Nm elf_getscn ,
.Nm elf_ndxscn ,
.Nm elf_newscn ,
.Nm elf_nextscn
.Nd get/allocate section information for an ELF object
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft "Elf_Scn *"
.Fn elf_getscn "Elf *elf" "size_t index"
.Ft size_t
.Fn elf_ndxscn "Elf_Scn *scn"
.Ft "Elf_Scn *"
.Fn elf_newscn "Elf *elf"
.Ft "Elf_Scn *"
.Fn elf_nextscn "Elf *elf" "Elf_Scn *scn"
.Sh DESCRIPTION
These functions are used to iterate through the sections associated
with an ELF descriptor.
.Pp
Function
.Fn elf_getscn
will return a section descriptor for the section at index
.Ar index
in the object denoted by ELF descriptor
.Ar elf .
An error will be signalled if the specified section does not
exist.
.Pp
Function
.Fn elf_ndxscn
returns the section table index associated with section descriptor
.Ar scn .
.Pp
Function
.Fn elf_newscn
creates a new section and appends it to the list of sections
associated with descriptor
.Ar elf .
The library will automatically increment the
.Va e_shnum
field of the ELF header associated with descriptor
.Ar elf ,
and will set the
.Dv ELF_F_DIRTY
flag on the returned section descriptor.
For ELF descriptors opened for writing, the ELF library will
automatically create an empty section at index zero
.Dv ( SHN_UNDEF )
on the first call to
.Fn elf_newscn .
.Pp
Function
.Fn elf_nextscn
takes a section descriptor
.Ar scn
and returns a pointer to the section descriptor at the next higher
index.
Argument
.Ar scn
is allowed to be NULL, in which case this function will return a
pointer to the section descriptor at index 1.
If no further sections are present, function
.Fn elf_nextscn
will return a NULL pointer.
.Sh RETURN VALUES
Functions
.Fn elf_getscn ,
.Fn elf_newscn
and
.Fn elf_nextscn
return a valid pointer to a section descriptor if successful, or
NULL if an error occurs.
.Pp
Function
.Fn elf_ndxscn
returns a valid section table index if successful, or
.Dv SHN_UNDEF
if an error occurs.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Arguments
.Ar elf
or
.Ar scn
were NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar index
exceeded the current number of sections in the ELF object.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not a descriptor for an ELF file.
.It Bq Er ELF_E_ARGUMENT
Section descriptor
.Ar scn
was not associated with ELF descriptor
.Ar elf .
.It Bq Er ELF_E_CLASS
Descriptor
.Ar elf
was of an unknown ELF class.
.It Bq Er ELF_E_SECTION
Argument
.Ar elf
specified extended section numbering in the ELF header with the section header at
index
.Dv SHN_UNDEF
not being of type
.Dv SHT_NULL .
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_flagdata 3 ,
.Xr elf_flagscn 3 ,
.Xr elf_getdata 3 ,
.Xr elf_getshdr 3 ,
.Xr gelf 3

78
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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 4, 2009
.Os
.Dt ELF_GETSHDRNUM 3
.Sh NAME
.Nm elf_getshdrnum
.Nd return the number of sections in an ELF file
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft int
.Fn elf_getshdrnum "Elf *elf" "size_t *shnum"
.Sh DESCRIPTION
Function
.Fn elf_getshdrnum
retrieves the number of ELF sections associated with descriptor
.Ar elf
and stores it into the location pointed to by argument
.Ar shnum .
.Pp
This routine allows applications to uniformly process both normal ELF
objects, and ELF objects that use extended section numbering.
.Pp
.Sh RETURN VALUES
Function
.Fn elf_getshdrnum
returns zero value if successful, or -1 in case of an error.
.Sh ERRORS
Function
.Fn elf_getshdrnum
can fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
A NULL value was passed in for argument
.Ar elf .
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not for an ELF file.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
lacks an ELF Executable header.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf32_getehdr 3 ,
.Xr elf64_getehdr 3 ,
.Xr elf_getident 3 ,
.Xr elf_getphdrnum 3 ,
.Xr elf_getshdrstrndx 3 ,
.Xr gelf 3 ,
.Xr gelf_getehdr 3

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 5, 2009
.Os
.Dt ELF_GETSHDRSTRNDX 3
.Sh NAME
.Nm elf_getshdrstrndx
.Nd retrieve the index of the section name string table
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft int
.Fn elf_getshdrstrndx "Elf *elf" "size_t *ndxptr"
.Sh DESCRIPTION
Function
.Fn elf_getshdrstrndx
retrieves the section index of the string table containing section
names from descriptor
.Ar elf
and stores it into the location pointed to by argument
.Ar ndxptr .
.Pp
This function allow applications to process both normal ELF
objects and ELF objects that use extended section numbering uniformly.
.Pp
.Sh RETURN VALUES
These functions return zero if successful, or -1 in case of an error.
.Sh ERRORS
These functions can fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
A NULL value was passed in for argument
.Ar elf .
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not for an ELF file.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
lacks an ELF Executable header.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar ndx
contained a value in the reserved range of section indices.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf32_getehdr 3 ,
.Xr elf64_getehdr 3 ,
.Xr elf_getident 3 ,
.Xr elf_getphdrnum 3 ,
.Xr elf_getshdrnum 3 ,
.Xr gelf 3 ,
.Xr gelf_getehdr 3

84
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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 5, 2009
.Os
.Dt ELF_GETSHNUM 3
.Sh NAME
.Nm elf_getshnum
.Nd return the number of sections in an ELF file
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft int
.Fn elf_getshnum "Elf *elf" "size_t *shnum"
.Sh DESCRIPTION
This function is deprecated.
Please use
.Xr elf_getshdrnum 3
instead.
.Pp
Function
.Fn elf_getshnum
retrieves the number of ELF sections associated with descriptor
.Ar elf
and stores it into the location pointed to by argument
.Ar shnum .
.Pp
This routine allows applications to uniformly process both normal ELF
objects, and ELF objects that use extended section numbering.
.Pp
.Sh RETURN VALUES
Function
.Fn elf_getshnum
returns a non-zero value if successful, or zero in case of an
error.
.Sh ERRORS
Function
.Fn elf_getshnum
can fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
A NULL value was passed in for argument
.Ar elf .
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not for an ELF file.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
lacks an ELF Executable header.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf32_getehdr 3 ,
.Xr elf64_getehdr 3 ,
.Xr elf_getident 3 ,
.Xr elf_getphdrnum 3 ,
.Xr elf_getshdrstrndx 3 ,
.Xr gelf 3 ,
.Xr gelf_getehdr 3

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 5, 2009
.Os
.Dt ELF_GETSHSTRNDX 3
.Sh NAME
.Nm elf_getshstrndx ,
.Nm elf_setshstrndx
.Nd retrieve/update the index of the section name string table
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft int
.Fn elf_getshstrndx "Elf *elf" "size_t *ndxptr"
.Ft int
.Fn elf_setshstrndx "Elf *elf" "size_t ndx"
.Sh DESCRIPTION
Function
.Fn elf_getshstrndx
retrieves the section index of the string table containing section
names from descriptor
.Ar elf
and stores it into the location pointed to by argument
.Ar ndxptr .
Function
.Fn elf_getshstrndx
is deprecated.
Please use
.Xr elf_getshdrstrndx 3
instead.
.Pp
Function
.Fn elf_setshstrndx
sets the index of the section name string table to argument
.Ar ndx .
.Pp
These routines allow applications to process both normal ELF
objects and ELF objects that use extended section numbering uniformly.
.Pp
.Sh RETURN VALUES
These functions return a non-zero value if successful, or zero in case
of an error.
.Sh ERRORS
These functions can fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
A NULL value was passed in for argument
.Ar elf .
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not for an ELF file.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
lacks an ELF Executable header.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar ndx
contained a value in the reserved range of section indices.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf32_getehdr 3 ,
.Xr elf64_getehdr 3 ,
.Xr elf_getident 3 ,
.Xr elf_getphdrnum 3 ,
.Xr elf_getshdrnum 3 ,
.Xr gelf 3 ,
.Xr gelf_getehdr 3

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 15, 2006
.Os
.Dt ELF_HASH 3
.Sh NAME
.Nm elf_hash
.Nd compute a hash value for a string
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft "unsigned long"
.Fn elf_hash "const char *name"
.Sh DESCRIPTION
Function
.Fn elf_hash
computes a portable hash value for the null terminated string
pointed to by argument
.Ar name .
.Pp
The hash value returned is will be identical across
machines of different architectures.
This allows hash tables to be built on one machine and
correctly used on another of a different architecture.
The hash value returned is also guaranteed
.Em not
to be the bit pattern of all ones (~0UL).
.Sh IMPLEMENTATION NOTES
The library internally uses unsigned 32 bit arithmetic to compute
the hash value.
.Sh SEE ALSO
.Xr elf 3 ,
.Xr gelf 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <libelf.h>
#include "_libelf_config.h"
LIBELF_VCSID("$Id$");
/*
* This elf_hash function is defined by the System V ABI.
*/
unsigned long
elf_hash(const char *name)
{
unsigned long h, t;
const unsigned char *s;
s = (const unsigned char *) name;
h = t = 0;
for (; *s != '\0'; h = h & ~t) {
h = (h << 4) + *s++;
t = h & 0xF0000000UL;
if (t)
h ^= t >> 24;
}
return (h);
}

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd June 1, 2006
.Os
.Dt ELF_KIND 3
.Sh NAME
.Nm elf_kind
.Nd determine ELF file type
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft Elf_Kind
.Fn elf_kind "Elf *elf"
.Sh DESCRIPTION
The
.Fn elf_kind
function identifies the kind of file associated with its argument
.Ar elf .
The argument
.Ar elf
is allowed to be NULL.
.Sh RETURN VALUES
The
.Fn elf_kind
function returns one of the following values:
.Bl -tag -width indent
.It Dv ELF_K_AR
The file associated with argument
.Ar elf
is an archive.
.It Dv ELF_K_ELF
The file associated with argument
.Ar elf
is an ELF file.
.It Dv ELF_K_NONE
The argument
.Ar elf
was NULL, or the ELF library could not determine the type of the file
associated with argument
.Ar elf ,
or an error occurred when processing.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_begin 3 ,
.Xr elf_getident 3 ,
.Xr gelf 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
Elf_Kind
elf_kind(Elf *e)
{
if (e == NULL)
return (ELF_K_NONE);
if (e->e_kind == ELF_K_AR ||
e->e_kind == ELF_K_ELF)
return (e->e_kind);
return (ELF_K_NONE);
}

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd June 28, 2006
.Os
.Dt ELF_MEMORY 3
.Sh NAME
.Nm elf_memory
.Nd process an ELF or ar(1) archive mapped into memory
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft "Elf *"
.Fn elf_memory "char *image" "size_t size"
.Sh DESCRIPTION
Function
.Fn elf_memory
is used to process an ELF file or
.Xr ar 1
archive whose image is present in memory.
.Pp
Argument
.Ar image
points to the start of the memory image of the file or archive.
Argument
.Ar size
contains the size in bytes of the memory image.
.Pp
The ELF descriptor is created for reading (i.e., analogous to the
use of
.Xr elf_begin 3
with a command argument value of
.Dv ELF_C_READ Ns ).
.Sh RETURN VALUES
Function
.Fn elf_memory
returns a pointer to a new ELF descriptor if successful, or NULL if an
error occurred.
.Pp
The return value may be queried for the file type using
.Xr elf_kind 3 .
.Sh EXAMPLES
To read parse an elf file, use:
.Bd -literal -offset indent
int fd;
void *p;
struct stat sb;
Elf *e;
\&...
if ((fd = open("./elf-file", O_RDONLY)) < 0 ||
fstat(fd, &sb) < 0 ||
(p = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, (off_t) 0)) ==
MAP_FAILED) {
... handle system error ...
}
if ((e = elf_memory(p, sb.st_size)) == NULL) {
... handle elf(3) error ...
}
\&... use ELF descriptor "e" here ...
.Ed
.Sh ERRORS
Function
.Fn elf_memory
can fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
A NULL value was used for argument
.Ar image
or the value of argument
.Ar sz
was zero.
.It Bq Er ELF_E_HEADER
The header of the ELF object contained an unsupported value in its
.Va e_ident[EI_CLASS]
field.
.It Bq Er ELF_E_HEADER
The header of the ELF object contained an unsupported value in its
.Va e_ident[EI_DATA]
field.
.It Bq Er ELF_E_RESOURCE
An out of memory condition was detected.
.It Bq Er ELF_E_SEQUENCE
Function
.Fn elf_memory
was called before a working version was set using
.Xr elf_version 3 .
.It Bq Er ELF_E_VERSION
The argument
.Ar image
corresponds to an ELF file with an unsupported version.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_begin 3 ,
.Xr elf_end 3 ,
.Xr elf_errno 3 ,
.Xr elf_kind 3 ,
.Xr gelf 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <ar.h>
#include <libelf.h>
#include <string.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
Elf *
elf_memory(char *image, size_t sz)
{
Elf *e;
if (LIBELF_PRIVATE(version) == EV_NONE) {
LIBELF_SET_ERROR(SEQUENCE, 0);
return (NULL);
}
if (image == NULL || sz == 0) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if ((e = _libelf_allocate_elf()) == NULL)
return (NULL);
e->e_cmd = ELF_C_READ;
e->e_rawfile = image;
e->e_rawsize = sz;
#undef LIBELF_IS_ELF
#define LIBELF_IS_ELF(P) ((P)[EI_MAG0] == ELFMAG0 && \
(P)[EI_MAG1] == ELFMAG1 && (P)[EI_MAG2] == ELFMAG2 && \
(P)[EI_MAG3] == ELFMAG3)
if (sz > EI_NIDENT && LIBELF_IS_ELF(image)) {
_libelf_init_elf(e, ELF_K_ELF);
e->e_class = image[EI_CLASS];
e->e_byteorder = image[EI_DATA];
e->e_version = image[EI_VERSION];
if (e->e_version > EV_CURRENT) {
e = _libelf_release_elf(e);
LIBELF_SET_ERROR(VERSION, 0);
return (NULL);
}
if ((e->e_byteorder != ELFDATA2LSB && e->e_byteorder !=
ELFDATA2MSB) || (e->e_class != ELFCLASS32 && e->e_class !=
ELFCLASS64)) {
e = _libelf_release_elf(e);
LIBELF_SET_ERROR(HEADER, 0);
return (NULL);
}
} else if (sz >= SARMAG &&
strncmp(image, ARMAG, (size_t) SARMAG) == 0) {
_libelf_init_elf(e, ELF_K_AR);
e = _libelf_ar_open(e);
} else
_libelf_init_elf(e, ELF_K_NONE);
return (e);
}

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd June 17, 2006
.Os
.Dt ELF_NEXT 3
.Sh NAME
.Nm elf_next
.Nd provide sequential access to the next archive member
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft Elf_Cmd
.Fn elf_next "Elf *elf"
.Sh DESCRIPTION
The
.Fn elf_next
function causes the ELF archive descriptor corresponding to argument
.Ar elf
to be adjusted to provide access to the next member in
the archive on a subsequent call to
.Fn elf_begin .
.Pp
The return value of
.Fn elf_next
is suitable for use in a loop invoking
.Fn elf_begin .
.Sh RETURN VALUES
If successful, function
.Fn elf_next
returns the value
.Dv ELF_C_READ .
Otherwise, if argument
.Ar elf
was not associated with an archive, or if it was
.Dv NULL ,
or if any other error occurred, the value
.Dv ELF_C_NULL
is returned.
.Sh EXAMPLES
To process all the members of an archive use:
.Bd -literal -offset indent
Elf_Cmd cmd;
Elf *archive, *e;
\&...
cmd = ELF_C_READ;
archive = elf_begin(fd, cmd, NULL);
while ((e = elf_begin(fd, cmd, archive)) != (Elf *) 0)
{
... process `e' here ...
cmd = elf_next(e);
elf_end(e);
}
elf_end(archive);
.Ed
.Sh ERRORS
Function
.Fn elf_next
may fail with the following error:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not associated with a containing
.Xr ar 1
archive.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_begin 3 ,
.Xr elf_end 3 ,
.Xr elf_rand 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <ar.h>
#include <assert.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
Elf_Cmd
elf_next(Elf *e)
{
off_t next;
Elf *parent;
if (e == NULL)
return (ELF_C_NULL);
if ((parent = e->e_parent) == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (ELF_C_NULL);
}
assert (parent->e_kind == ELF_K_AR);
assert (parent->e_cmd == ELF_C_READ);
assert(e->e_rawfile > parent->e_rawfile);
next = e->e_rawfile - parent->e_rawfile + e->e_rawsize;
next = (next + 1) & ~1; /* round up to an even boundary */
parent->e_u.e_ar.e_next = (next >= (off_t) parent->e_rawsize) ? (off_t) 0 : next;
return (ELF_C_READ);
}

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <ar.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
static int
_libelf_getphdrnum(Elf *e, size_t *phnum)
{
void *eh;
int ec;
if (e == NULL || e->e_kind != ELF_K_ELF ||
((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (-1);
}
if ((eh = _libelf_ehdr(e, ec, 0)) == NULL)
return (-1);
*phnum = e->e_u.e_elf.e_nphdr;
return (0);
}
int
elf_getphdrnum(Elf *e, size_t *phnum)
{
return (_libelf_getphdrnum(e, phnum));
}
/* Deprecated API */
int
elf_getphnum(Elf *e, size_t *phnum)
{
return (_libelf_getphdrnum(e, phnum) >= 0);
}

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd June 17, 2006
.Os
.Dt ELF_RAND 3
.Sh NAME
.Nm elf_rand
.Nd provide sequential access to the next archive member
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft off_t
.Fn elf_rand "Elf *archive" "off_t offset"
.Sh DESCRIPTION
The
.Fn elf_rand
function causes the ELF descriptor
.Ar archive
to be adjusted so that the next call to
.Xr elf_begin 3
will provide access to the archive member at byte offset
.Ar offset
in the archive.
Argument
.Ar offset
is the byte offset from the start of the archive to the beginning of
the archive header for the desired member.
.Pp
Archive member offsets may be retrieved using the
.Xr elf_getarsym 3
function.
.Sh RETURN VALUES
Function
.Fn elf_rand
returns
.Ar offset
if successful or zero in case of an error.
.Sh EXAMPLES
To process all the members of an archive use:
.Bd -literal -offset indent
off_t off;
Elf *archive, *e;
\&...
cmd = ELF_C_READ;
archive = elf_begin(fd, cmd, NULL);
while ((e = elf_begin(fd, cmd, archive)) != (Elf *) 0)
{
... process `e' here ...
elf_end(e);
off = ...new value...;
if (elf_rand(archive, off) != off) {
... process error ...
}
}
elf_end(archive);
.Ed
.Pp
To rewind an archive, use:
.Bd -literal -offset indent
Elf *archive;
\&...
if (elf_rand(archive, SARMAG) != SARMAG) {
... error ...
}
.Ed
.Sh ERRORS
Function
.Fn elf_rand
may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar archive
was null.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar archive
was not a descriptor for an
.Xr ar 1
archive.
.It Bq Er ELF_E_ARCHIVE
Argument
.Ar offset
did not correspond to the start of an archive member header.
.El
.Sh SEE ALSO
.Xr ar 1 ,
.Xr elf 3 ,
.Xr elf_begin 3 ,
.Xr elf_end 3 ,
.Xr elf_getarsym 3 ,
.Xr elf_next 3 ,
.Xr gelf 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <ar.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
off_t
elf_rand(Elf *ar, off_t offset)
{
struct ar_hdr *arh;
if (ar == NULL || ar->e_kind != ELF_K_AR ||
(offset & 1) || offset < SARMAG ||
offset + sizeof(struct ar_hdr) >= ar->e_rawsize) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return 0;
}
arh = (struct ar_hdr *) (ar->e_rawfile + offset);
/* a too simple sanity check */
if (arh->ar_fmag[0] != '`' || arh->ar_fmag[1] != '\n') {
LIBELF_SET_ERROR(ARCHIVE, 0);
return 0;
}
ar->e_u.e_ar.e_next = offset;
return (offset);
}

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd July 3, 2006
.Os
.Dt ELF_RAWFILE 3
.Sh NAME
.Nm elf_rawfile
.Nd return uninterpreted contents of an ELF file
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft char *
.Fn elf_rawfile "Elf *elf" "size_t *sz"
.Sh DESCRIPTION
Function
.Fn elf_rawfile
returns the uninterpreted contents of the file referenced by ELF descriptor
.Ar elf .
.Pp
If argument
.Ar sz
is non-null, the function stores the file's size in bytes
in the location to which it points.
A value of zero is written to this location if an error is
encountered.
.Sh RETURN VALUES
Function
.Fn elf_rawfile
returns a valid pointer if successful or NULL if an error occurs.
.Sh ERRORS
Function
.Fn elf_rawfile
may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was NULL.
.It Bq Er ELF_E_SEQUENCE
Argument
.Ar elf
was opened for writing and function
.Fn elf_rawfile
was invoked before
.Xr elf_update 3 .
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_getdata 3 ,
.Xr elf_getident 3 ,
.Xr elf_kind 3 ,
.Xr elf_update 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
char *
elf_rawfile(Elf *e, size_t *sz)
{
char *ptr;
size_t size;
size = e ? e->e_rawsize : 0;
ptr = NULL;
if (e == NULL)
LIBELF_SET_ERROR(ARGUMENT, 0);
else if ((ptr = e->e_rawfile) == NULL && e->e_cmd == ELF_C_WRITE)
LIBELF_SET_ERROR(SEQUENCE, 0);
if (sz)
*sz = size;
return (ptr);
}

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/*-
* Copyright (c) 2006,2008-2010 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/queue.h>
#include <assert.h>
#include <errno.h>
#include <gelf.h>
#include <libelf.h>
#include <stddef.h>
#include <stdlib.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
/*
* Load an ELF section table and create a list of Elf_Scn structures.
*/
int
_libelf_load_section_headers(Elf *e, void *ehdr)
{
int ec, swapbytes;
size_t fsz, i, shnum;
uint64_t shoff;
char *src;
Elf32_Ehdr *eh32;
Elf64_Ehdr *eh64;
Elf_Scn *scn;
int (*xlator)(char *_d, size_t _dsz, char *_s, size_t _c, int _swap);
assert(e != NULL);
assert(ehdr != NULL);
assert((e->e_flags & LIBELF_F_SHDRS_LOADED) == 0);
#define CHECK_EHDR(E,EH) do { \
if (fsz != (EH)->e_shentsize || \
shoff + fsz * shnum > e->e_rawsize) { \
LIBELF_SET_ERROR(HEADER, 0); \
return (0); \
} \
} while (0)
ec = e->e_class;
fsz = _libelf_fsize(ELF_T_SHDR, ec, e->e_version, (size_t) 1);
assert(fsz > 0);
shnum = e->e_u.e_elf.e_nscn;
if (ec == ELFCLASS32) {
eh32 = (Elf32_Ehdr *) ehdr;
shoff = (uint64_t) eh32->e_shoff;
CHECK_EHDR(e, eh32);
} else {
eh64 = (Elf64_Ehdr *) ehdr;
shoff = eh64->e_shoff;
CHECK_EHDR(e, eh64);
}
xlator = _libelf_get_translator(ELF_T_SHDR, ELF_TOMEMORY, ec);
swapbytes = e->e_byteorder != LIBELF_PRIVATE(byteorder);
src = e->e_rawfile + shoff;
/*
* If the file is using extended numbering then section #0
* would have already been read in.
*/
i = 0;
if (!STAILQ_EMPTY(&e->e_u.e_elf.e_scn)) {
assert(STAILQ_FIRST(&e->e_u.e_elf.e_scn) ==
STAILQ_LAST(&e->e_u.e_elf.e_scn, _Elf_Scn, s_next));
i = 1;
src += fsz;
}
for (; i < shnum; i++, src += fsz) {
if ((scn = _libelf_allocate_scn(e, i)) == NULL)
return (0);
(*xlator)((char *) &scn->s_shdr, sizeof(scn->s_shdr), src,
(size_t) 1, swapbytes);
if (ec == ELFCLASS32) {
scn->s_offset = scn->s_rawoff =
scn->s_shdr.s_shdr32.sh_offset;
scn->s_size = scn->s_shdr.s_shdr32.sh_size;
} else {
scn->s_offset = scn->s_rawoff =
scn->s_shdr.s_shdr64.sh_offset;
scn->s_size = scn->s_shdr.s_shdr64.sh_size;
}
}
e->e_flags |= LIBELF_F_SHDRS_LOADED;
return (1);
}
Elf_Scn *
elf_getscn(Elf *e, size_t index)
{
int ec;
void *ehdr;
Elf_Scn *s;
if (e == NULL || e->e_kind != ELF_K_ELF ||
((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
return (NULL);
if (e->e_cmd != ELF_C_WRITE &&
(e->e_flags & LIBELF_F_SHDRS_LOADED) == 0 &&
_libelf_load_section_headers(e, ehdr) == 0)
return (NULL);
STAILQ_FOREACH(s, &e->e_u.e_elf.e_scn, s_next)
if (s->s_ndx == index)
return (s);
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
size_t
elf_ndxscn(Elf_Scn *s)
{
if (s == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (SHN_UNDEF);
}
return (s->s_ndx);
}
Elf_Scn *
elf_newscn(Elf *e)
{
int ec;
void *ehdr;
Elf_Scn *scn;
if (e == NULL || e->e_kind != ELF_K_ELF) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) {
LIBELF_SET_ERROR(CLASS, 0);
return (NULL);
}
if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
return (NULL);
/*
* The application may be asking for a new section descriptor
* on an ELF object opened with ELF_C_RDWR or ELF_C_READ. We
* need to bring in the existing section information before
* appending a new one to the list.
*
* Per the ELF(3) API, an application is allowed to open a
* file using ELF_C_READ, mess with its internal structure and
* use elf_update(...,ELF_C_NULL) to compute its new layout.
*/
if (e->e_cmd != ELF_C_WRITE &&
(e->e_flags & LIBELF_F_SHDRS_LOADED) == 0 &&
_libelf_load_section_headers(e, ehdr) == 0)
return (NULL);
if (STAILQ_EMPTY(&e->e_u.e_elf.e_scn)) {
assert(e->e_u.e_elf.e_nscn == 0);
if ((scn = _libelf_allocate_scn(e, (size_t) SHN_UNDEF)) ==
NULL)
return (NULL);
e->e_u.e_elf.e_nscn++;
}
assert(e->e_u.e_elf.e_nscn > 0);
if ((scn = _libelf_allocate_scn(e, e->e_u.e_elf.e_nscn)) == NULL)
return (NULL);
e->e_u.e_elf.e_nscn++;
(void) elf_flagscn(scn, ELF_C_SET, ELF_F_DIRTY);
return (scn);
}
Elf_Scn *
elf_nextscn(Elf *e, Elf_Scn *s)
{
if (e == NULL || (e->e_kind != ELF_K_ELF) ||
(s && s->s_elf != e)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
return (s == NULL ? elf_getscn(e, (size_t) 1) :
STAILQ_NEXT(s, s_next));
}

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <ar.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
static int
_libelf_getshdrnum(Elf *e, size_t *shnum)
{
void *eh;
int ec;
if (e == NULL || e->e_kind != ELF_K_ELF ||
((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (-1);
}
if ((eh = _libelf_ehdr(e, ec, 0)) == NULL)
return (-1);
*shnum = e->e_u.e_elf.e_nscn;
return (0);
}
int
elf_getshdrnum(Elf *e, size_t *shnum)
{
return (_libelf_getshdrnum(e, shnum));
}
/* Deprecated API. */
int
elf_getshnum(Elf *e, size_t *shnum)
{
return (_libelf_getshdrnum(e, shnum) >= 0);
}

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <ar.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
static int
_libelf_getshdrstrndx(Elf *e, size_t *strndx)
{
void *eh;
int ec;
if (e == NULL || e->e_kind != ELF_K_ELF ||
((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (-1);
}
if ((eh = _libelf_ehdr(e, ec, 0)) == NULL)
return (-1);
*strndx = e->e_u.e_elf.e_strndx;
return (0);
}
int
elf_getshdrstrndx(Elf *e, size_t *strndx)
{
return (_libelf_getshdrstrndx(e, strndx));
}
int
elf_getshstrndx(Elf *e, size_t *strndx) /* Deprecated API. */
{
return (_libelf_getshdrstrndx(e, strndx) >= 0);
}
int
elf_setshstrndx(Elf *e, size_t strndx)
{
void *eh;
int ec;
if (e == NULL || e->e_kind != ELF_K_ELF ||
((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) ||
((eh = _libelf_ehdr(e, ec, 0)) == NULL)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
return (_libelf_setshstrndx(e, eh, ec, strndx));
}

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd December 16, 2006
.Os
.Dt ELF_STRPTR 3
.Sh NAME
.Nm elf_strptr
.Nd retrieve a string pointer in a string table
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft "char *"
.Fn elf_strptr "Elf *elf" "size_t scndx" "size_t stroffset"
.Sh DESCRIPTION
Function
.Fn elf_strptr
allows an application to convert a string table offset to a string
pointer, correctly translating the offset in the presence
of multiple
.Vt Elf_Data
descriptors covering the contents of the section.
.Pp
Argument
.Ar elf
is a descriptor for an ELF object.
Argument
.Ar scndx
is the section index for an ELF string table.
Argument
.Ar stroffset
is the index of the desired string in the string
table.
.Sh RETURN VALUES
Function
.Fn elf_strptr
returns a valid pointer on success or NULL in case an error was
encountered.
.Sh ERRORS
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was NULL
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not a descriptor for an ELF object.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar scndx
was not the section index for a string table.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar stroffset
exceeded the size of the string table.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar stroffset
index an unallocated region of the string table.
.It Bq Er ELF_E_DATA
Offset
.Ar stroffset
indexed a region that was not covered by any Elf_Data
descriptor.
.It Bq Er ELF_E_DATA
An erroneous
.Vt Elf_Data
descriptor was part of the section specified by argument
.Ar scndx .
.It Bq Er ELF_E_HEADER
ELF descriptor
.Ar elf
contained an invalid section header.
.It Bq Er ELF_E_RESOURCE
An out of memory condition was detected.
.It Bq Er ELF_E_SECTION
Section
.Ar scndx
contained a malformed section header.
.It Bq Er ELF_E_SECTION
The ELF descriptor in argument
.Ar elf
did not adhere to the conventions used for extended numbering.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf32_getshdr 3 ,
.Xr elf64_getshdr 3 ,
.Xr elf_getdata 3 ,
.Xr elf_rawdata 3 ,
.Xr gelf 3 ,
.Xr gelf_getshdr 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <assert.h>
#include <gelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
/*
* Convert an ELF section#,offset pair to a string pointer.
*/
char *
elf_strptr(Elf *e, size_t scndx, size_t offset)
{
Elf_Scn *s;
Elf_Data *d;
size_t alignment, count;
GElf_Shdr shdr;
if (e == NULL || e->e_kind != ELF_K_ELF) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if ((s = elf_getscn(e, scndx)) == NULL ||
gelf_getshdr(s, &shdr) == NULL)
return (NULL);
if (shdr.sh_type != SHT_STRTAB ||
offset >= shdr.sh_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
d = NULL;
if (e->e_flags & ELF_F_LAYOUT) {
/*
* The application is taking responsibility for the
* ELF object's layout, so we can directly translate
* an offset to a `char *' address using the `d_off'
* members of Elf_Data descriptors.
*/
while ((d = elf_getdata(s, d)) != NULL) {
if (d->d_buf == 0 || d->d_size == 0)
continue;
if (d->d_type != ELF_T_BYTE) {
LIBELF_SET_ERROR(DATA, 0);
return (NULL);
}
if (offset >= d->d_off &&
offset < d->d_off + d->d_size)
return ((char *) d->d_buf + offset - d->d_off);
}
} else {
/*
* Otherwise, the `d_off' members are not useable and
* we need to compute offsets ourselves, taking into
* account 'holes' in coverage of the section introduced
* by alignment requirements.
*/
count = (size_t) 0; /* cumulative count of bytes seen */
while ((d = elf_getdata(s, d)) != NULL && count <= offset) {
if (d->d_buf == NULL || d->d_size == 0)
continue;
if (d->d_type != ELF_T_BYTE) {
LIBELF_SET_ERROR(DATA, 0);
return (NULL);
}
if ((alignment = d->d_align) > 1) {
if ((alignment & (alignment - 1)) != 0) {
LIBELF_SET_ERROR(DATA, 0);
return (NULL);
}
count = roundup2(count, alignment);
}
if (offset < count) {
/* offset starts in the 'hole' */
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if (offset < count + d->d_size) {
if (d->d_buf != NULL)
return ((char *) d->d_buf +
offset - count);
LIBELF_SET_ERROR(DATA, 0);
return (NULL);
}
count += d->d_size;
}
}
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}

309
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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
*/
/*
* ELF types, defined in the "enum Elf_Type" API.
*
* The members of the list form a 2-tuple: (name, C-type-suffix).
* + `name' is an Elf_Type symbol without the `ELF_T_' prefix.
* + `C-type-suffix' is the suffix for Elf32_ and Elf64_ type names.
*/
define(`ELF_TYPE_LIST',
``ADDR, Addr',
`BYTE, Byte',
`CAP, Cap',
`DYN, Dyn',
`EHDR, Ehdr',
`GNUHASH, -',
`HALF, Half',
`LWORD, Lword',
`MOVE, Move',
`MOVEP, MoveP',
`NOTE, Note',
`OFF, Off',
`PHDR, Phdr',
`REL, Rel',
`RELA, Rela',
`SHDR, Shdr',
`SWORD, Sword',
`SXWORD, Sxword',
`SYMINFO, Syminfo',
`SYM, Sym',
`VDEF, Verdef',
`VNEED, Verneed',
`WORD, Word',
`XWORD, Xword',
`NUM, _'')
/*
* DEFINE_STRUCT(NAME,MEMBERLIST...)
*
* Map a type name to its members.
*
* Each member-list element comprises of pairs of (field name, type),
* in the sequence used in the file representation of `NAME'.
*
* Each member list element comprises a pair containing a field name
* and a basic type. Basic types include IDENT, HALF, WORD, LWORD,
* ADDR{32,64}, OFF{32,64}, SWORD, XWORD, SXWORD.
*
* The last element of a member list is the null element: `_,_'.
*/
define(`DEFINE_STRUCT',`define(`$1_DEF',shift($@))dnl')
DEFINE_STRUCT(`Elf32_Cap',
``c_tag, WORD',
`c_un.c_val, WORD',
`_,_'')
DEFINE_STRUCT(`Elf64_Cap',
``c_tag, XWORD',
`c_un.c_val, XWORD',
`_,_'')
DEFINE_STRUCT(`Elf32_Dyn',
``d_tag, SWORD',
`d_un.d_ptr, WORD',
`_,_'')
DEFINE_STRUCT(`Elf64_Dyn',
``d_tag, SXWORD',
`d_un.d_ptr, XWORD',
`_,_'')
DEFINE_STRUCT(`Elf32_Ehdr',
``e_ident, IDENT',
`e_type, HALF',
`e_machine, HALF',
`e_version, WORD',
`e_entry, ADDR',
`e_phoff, OFF',
`e_shoff, OFF',
`e_flags, WORD',
`e_ehsize, HALF',
`e_phentsize, HALF',
`e_phnum, HALF',
`e_shentsize, HALF',
`e_shnum, HALF',
`e_shstrndx, HALF',
`_,_'')
DEFINE_STRUCT(`Elf64_Ehdr',
``e_ident, IDENT',
`e_type, HALF',
`e_machine, HALF',
`e_version, WORD',
`e_entry, ADDR',
`e_phoff, OFF',
`e_shoff, OFF',
`e_flags, WORD',
`e_ehsize, HALF',
`e_phentsize, HALF',
`e_phnum, HALF',
`e_shentsize, HALF',
`e_shnum, HALF',
`e_shstrndx, HALF',
`_,_'')
DEFINE_STRUCT(`Elf32_Move',
``m_value, LWORD',
`m_info, WORD',
`m_poffset, WORD',
`m_repeat, HALF',
`m_stride, HALF',
`_,_'')
DEFINE_STRUCT(`Elf64_Move',
``m_value, LWORD',
`m_info, XWORD',
`m_poffset, XWORD',
`m_repeat, HALF',
`m_stride, HALF',
`_,_'')
DEFINE_STRUCT(`Elf32_Phdr',
``p_type, WORD',
`p_offset, OFF',
`p_vaddr, ADDR',
`p_paddr, ADDR',
`p_filesz, WORD',
`p_memsz, WORD',
`p_flags, WORD',
`p_align, WORD',
`_,_'')
DEFINE_STRUCT(`Elf64_Phdr',
``p_type, WORD',
`p_flags, WORD',
`p_offset, OFF',
`p_vaddr, ADDR',
`p_paddr, ADDR',
`p_filesz, XWORD',
`p_memsz, XWORD',
`p_align, XWORD',
`_,_'')
DEFINE_STRUCT(`Elf32_Rel',
``r_offset, ADDR',
`r_info, WORD',
`_,_'')
DEFINE_STRUCT(`Elf64_Rel',
``r_offset, ADDR',
`r_info, XWORD',
`_,_'')
DEFINE_STRUCT(`Elf32_Rela',
``r_offset, ADDR',
`r_info, WORD',
`r_addend, SWORD',
`_,_'')
DEFINE_STRUCT(`Elf64_Rela',
``r_offset, ADDR',
`r_info, XWORD',
`r_addend, SXWORD',
`_,_'')
DEFINE_STRUCT(`Elf32_Shdr',
``sh_name, WORD',
`sh_type, WORD',
`sh_flags, WORD',
`sh_addr, ADDR',
`sh_offset, OFF',
`sh_size, WORD',
`sh_link, WORD',
`sh_info, WORD',
`sh_addralign, WORD',
`sh_entsize, WORD',
`_,_'')
DEFINE_STRUCT(`Elf64_Shdr',
``sh_name, WORD',
`sh_type, WORD',
`sh_flags, XWORD',
`sh_addr, ADDR',
`sh_offset, OFF',
`sh_size, XWORD',
`sh_link, WORD',
`sh_info, WORD',
`sh_addralign, XWORD',
`sh_entsize, XWORD',
`_,_'')
DEFINE_STRUCT(`Elf32_Sym',
``st_name, WORD',
`st_value, ADDR',
`st_size, WORD',
`st_info, BYTE',
`st_other, BYTE',
`st_shndx, HALF',
`_,_'')
DEFINE_STRUCT(`Elf64_Sym',
``st_name, WORD',
`st_info, BYTE',
`st_other, BYTE',
`st_shndx, HALF',
`st_value, ADDR',
`st_size, XWORD',
`_,_'')
DEFINE_STRUCT(`Elf32_Syminfo',
``si_boundto, HALF',
`si_flags, HALF',
`_,_'')
DEFINE_STRUCT(`Elf64_Syminfo',
``si_boundto, HALF',
`si_flags, HALF',
`_,_'')
DEFINE_STRUCT(`Elf32_Verdaux',
``vda_name, WORD',
`vda_next, WORD',
`_,_'')
DEFINE_STRUCT(`Elf64_Verdaux',
``vda_name, WORD',
`vda_next, WORD',
`_,_'')
DEFINE_STRUCT(`Elf32_Verdef',
``vd_version, HALF',
`vd_flags, HALF',
`vd_ndx, HALF',
`vd_cnt, HALF',
`vd_hash, WORD',
`vd_aux, WORD',
`vd_next, WORD',
`_,_'')
DEFINE_STRUCT(`Elf64_Verdef',
``vd_version, HALF',
`vd_flags, HALF',
`vd_ndx, HALF',
`vd_cnt, HALF',
`vd_hash, WORD',
`vd_aux, WORD',
`vd_next, WORD',
`_,_'')
DEFINE_STRUCT(`Elf32_Verneed',
``vn_version, HALF',
`vn_cnt, HALF',
`vn_file, WORD',
`vn_aux, WORD',
`vn_next, WORD',
`_,_'')
DEFINE_STRUCT(`Elf64_Verneed',
``vn_version, HALF',
`vn_cnt, HALF',
`vn_file, WORD',
`vn_aux, WORD',
`vn_next, WORD',
`_,_'')
DEFINE_STRUCT(`Elf32_Vernaux',
``vna_hash, WORD',
`vna_flags, HALF',
`vna_other, HALF',
`vna_name, WORD',
`vna_next, WORD',
`_,_'')
DEFINE_STRUCT(`Elf64_Vernaux',
``vna_hash, WORD',
`vna_flags, HALF',
`vna_other, HALF',
`vna_name, WORD',
`vna_next, WORD',
`_,_'')

286
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.\" Copyright (c) 2006-2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd March 19, 2008
.Os
.Dt ELF_UPDATE 3
.Sh NAME
.Nm elf_update
.Nd update an ELF descriptor
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft off_t
.Fn elf_update "Elf *elf" "Elf_Cmd cmd"
.Sh DESCRIPTION
Function
.Fn elf_update
causes the library to recalculate the structure of an ELF
object and optionally write out the image of the object
to file.
.Pp
Argument
.Ar elf
is a descriptor to an ELF object.
Argument
.Ar cmd
can take on the following values:
.Bl -tag -width "ELF_C_WRITE"
.It Dv ELF_C_NULL
The library will recalculate structural information flagging
modified structures with the
.Dv ELF_F_DIRTY
flag, but will not write back data to the underlying file image.
.It Dv ELF_C_WRITE
The library will recalculate structural information and will
also write the new image to the underlying file.
.El
.Ss File Layout
If the
.Dv ELF_F_LAYOUT
flag has been set on the ELF descriptor, the application assumes full
responsibility for the layout of the ELF object.
If this flag is not set, the ELF library will compute the layout of the
file from its associated section descriptors.
.Pp
It is the application's responsibility to manage the the following
structure members in the ELF file:
.Bl -tag -width indent
.It "Executable Header"
The ELF executable header is described in
.Xr elf 5 .
The following members of the ELF executable header are the application's
responsibility:
.Pp
.Bl -tag -width "e_ident[EI_OSABI]" -compact
.It Va e_entry
Set to the desired entry address for executables.
.It Va e_flags
Set to the desired processor specific flags.
.It Va "e_ident[EI_DATA]"
Must be set to one of
.Dv ELFDATA2LSB
or
.Dv ELFDATA2MSB .
.It Va "e_ident[EI_OSABI]"
Set to the OS ABI desired.
For example, for
.Fx
executables, this field should be set to
.Dv ELFOSABI_FREEBSD .
.It Va e_machine
Set to the desired machine architecture, one of the
.Dv EM_*
values in
.In sys/elf_common.h .
.It Va e_phoff
If the application is managing the object's layout, it must
set this field to the file offset of the ELF program header table.
.It Va e_shoff
If the application is managing the object's layout, it must
set this field to the file offset of the ELF section header table.
.It Va e_shstrndx
Set to the index of the string table containing
section names.
.It Va e_type
Set to the type of the ELF object, one of the
.Dv ET_*
values in
.In sys/elf_common.h .
.It Va e_version
Set to the desired version of the ELF object.
.El
.It "Program Header"
All fields of the entries in the program header table are
under application control.
.It "Section Header"
The ELF section header is described in
.Xr elf 5 .
The following members of the ELF section header are the
application's responsibility:
.Pp
.Bl -tag -width "sh_addralign" -compact
.It Va sh_addr
Set to the physical memory address where the section should reside.
.It Va sh_addralign
If the application is managing the file layout, it must set this
field to the desired alignment for the section's contents.
This value must be a power of two.
.It Va sh_entsize
Set to the size of each entry, for sections containing fixed size
elements, or set to zero for sections without fixed size elements.
If the application is not managing file layout, it may leave this
field as zero for those sections whose types are known to the library.
.It Va sh_flags
Set to the desired section flags.
.It Va sh_info
Set as described in
.Xr elf 5 .
.It Va sh_link
Set as described in
.Xr elf 5 .
.It Va sh_name
Set to the index of the section's name in the string table containing
section names.
.It Va sh_offset
If the application is managing the file layout, it must set this
field to the file offset of the section's contents.
.It Va sh_size
If the application is managing the file layout, it must set this
field to the file size of the section's contents.
.It Va sh_type
Set to the type of the section.
.El
.El
.Pp
Gaps in the coverage of the file's contents will be set to the fill value
specified by
.Xr elf_fill 3 .
.Pp
If the application has requested full control over the file's layout by
setting the
.Dv ELF_F_LAYOUT
flag on the ELF descriptor, it should ensure that there are no
gaps in the coverage of the file's contents.
.Pp
All pointers to
.Vt Elf_Scn
and
.Vt Elf_Data
descriptors associated with descriptor
.Ar elf
should be considered as invalid after a call to
.Fn elf_update .
.Sh RETURN VALUES
Function
.Fn elf_update
returns the total size of the file image if successful, or -1 if an
error occurred.
.Sh ERRORS
This function may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was null.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar cmd
was not recognized.
.It Bq Er ELF_E_ARGUMENT
The argument
.Ar elf
was not a descriptor for an ELF object.
.It Bq Er ELF_E_CLASS
The
.Va e_ident[EI_CLASS]
field of the executable header of argument
.Ar elf
did not match the class of the file.
.It Bq Er ELF_E_DATA
An
.Vt Elf_Data
descriptor contained in argument
.Ar elf
specified a type incompatible with its containing section.
.It Bq Er ELF_E_HEADER
The ELF header in argument
.Ar elf
requested a different byte order from the byte order already
associated with the file.
.It Bq Er ELF_E_IO
An I/O error was encountered.
.It Bq Er ELF_E_LAYOUT
An
.Vt Elf_Data
descriptor contained in argument
.Ar elf
specified an alignment incompatible with its containing section.
.It Bq Er ELF_E_LAYOUT
Argument
.Ar elf
contained section descriptors that overlapped in extent.
.It Bq Er ELF_E_LAYOUT
Argument
.Ar elf
contained section descriptors that were incorrectly aligned or were
too small for their data.
.It Bq Er ELF_E_LAYOUT
The flag
.Dv ELF_F_LAYOUT
was set on the Elf descriptor and the section header table overlapped
an extent in the object mapped by a section descriptor.
.It Bq Er ELF_E_MODE
An
.Dv ELF_C_WRITE
operation was requested with an ELF descriptor that was not opened for
writing or updating.
.It Bq Er ELF_E_SECTION
Argument
.Ar elf
contained a section with an unrecognized type.
.It Bq Er ELF_E_SECTION
The section header at index
.Dv SHN_UNDEF
had an illegal section type.
.It Bq Er ELF_E_SEQUENCE
An
.Dv ELF_C_WRITE
operation was requested after a prior call to
.Fn elf_cntl elf ELF_C_FDDONE
disassociated the ELF descriptor
.Ar elf
from its underlying file.
.It Bq Er ELF_E_VERSION
Argument
.Ar elf
had an unsupported version or contained an
.Vt Elf_Data
descriptor with an unsupported version.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf32_getehdr 3 ,
.Xr elf32_getphdr 3 ,
.Xr elf32_newehdr 3 ,
.Xr elf32_newphdr 3 ,
.Xr elf64_getehdr 3 ,
.Xr elf64_getphdr 3 ,
.Xr elf64_newehdr 3 ,
.Xr elf64_newphdr 3 ,
.Xr elf_cntl 3 ,
.Xr elf_fill 3 ,
.Xr elf_flagehdr 3 ,
.Xr elf_flagelf 3 ,
.Xr elf_getdata 3 ,
.Xr elf_getscn 3 ,
.Xr elf_newdata 3 ,
.Xr elf_newscn 3 ,
.Xr elf_rawdata 3 ,
.Xr gelf 3 ,
.Xr gelf_newehdr 3 ,
.Xr gelf_newphdr 3 ,
.Xr elf 5

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/*-
* Copyright (c) 2006-2010 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if 0
#include <sys/mman.h>
#endif
#include <assert.h>
#include <errno.h>
#include <gelf.h>
#include <libelf.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
/*
* Update the internal data structures associated with an ELF object.
* Returns the size in bytes the ELF object would occupy in its file
* representation.
*
* After a successful call to this function, the following structures
* are updated:
*
* - The ELF header is updated.
* - All sections are sorted in order of ascending addresses and their
* section header table entries updated. An error is signalled
* if an overlap was detected among sections.
* - All data descriptors associated with a section are sorted in order
* of ascending addresses. Overlaps, if detected, are signalled as
* errors. Other sanity checks for alignments, section types etc. are
* made.
*
* After a resync_elf() successfully returns, the ELF descriptor is
* ready for being handed over to _libelf_write_elf().
*
* File alignments:
* PHDR - Addr
* SHDR - Addr
*
* XXX: how do we handle 'flags'.
*/
/*
* Compute the extents of a section, by looking at the data
* descriptors associated with it. The function returns zero if an
* error was detected. `*rc' holds the maximum file extent seen so
* far.
*/
static int
_libelf_compute_section_extents(Elf *e, Elf_Scn *s, off_t *rc)
{
int ec;
Elf_Data *d, *td;
unsigned int elftype;
uint32_t sh_type;
uint64_t d_align;
uint64_t sh_align, sh_entsize, sh_offset, sh_size;
uint64_t scn_size, scn_alignment;
/*
* We need to recompute library private data structures if one
* or more of the following is true:
* - The underlying Shdr structure has been marked `dirty'. Significant
* fields include: `sh_offset', `sh_type', `sh_size', `sh_addralign'.
* - The Elf_Data structures part of this section have been marked
* `dirty'. Affected members include `d_align', `d_offset', `d_type',
* and `d_size'.
* - The section as a whole is `dirty', e.g., it has been allocated
* using elf_newscn(), or if a new Elf_Data structure was added using
* elf_newdata().
*
* Each of these conditions would result in the ELF_F_DIRTY bit being
* set on the section descriptor's `s_flags' field.
*/
ec = e->e_class;
if (ec == ELFCLASS32) {
sh_type = s->s_shdr.s_shdr32.sh_type;
sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign;
sh_entsize = (uint64_t) s->s_shdr.s_shdr32.sh_entsize;
sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset;
sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size;
} else {
sh_type = s->s_shdr.s_shdr64.sh_type;
sh_align = s->s_shdr.s_shdr64.sh_addralign;
sh_entsize = s->s_shdr.s_shdr64.sh_entsize;
sh_offset = s->s_shdr.s_shdr64.sh_offset;
sh_size = s->s_shdr.s_shdr64.sh_size;
}
if (sh_type == SHT_NULL || sh_type == SHT_NOBITS)
return (1);
/*
* Use the data in the section header entry
* - for sections that are not marked as 'dirty', and,
* - for sections in ELF objects opened in in read/write mode
* for which data descriptors have not been retrieved.
*/
if ((s->s_flags & ELF_F_DIRTY) == 0 ||
((e->e_cmd == ELF_C_RDWR) && STAILQ_EMPTY(&s->s_data))) {
if ((size_t) *rc < sh_offset + sh_size)
*rc = sh_offset + sh_size;
return (1);
}
elftype = _libelf_xlate_shtype(sh_type);
if (elftype > ELF_T_LAST) {
LIBELF_SET_ERROR(SECTION, 0);
return (0);
}
/*
* Compute the extent of the data descriptors associated with
* this section.
*/
scn_alignment = 0;
if (sh_align == 0)
sh_align = _libelf_falign(elftype, ec);
/* Compute the section alignment. */
STAILQ_FOREACH(d, &s->s_data, d_next) {
if (d->d_type != elftype) {
LIBELF_SET_ERROR(DATA, 0);
return (0);
}
if (d->d_version != e->e_version) {
LIBELF_SET_ERROR(VERSION, 0);
return (0);
}
if ((d_align = d->d_align) % sh_align) {
LIBELF_SET_ERROR(LAYOUT, 0);
return (0);
}
if (d_align == 0 || (d_align & (d_align - 1))) {
LIBELF_SET_ERROR(DATA, 0);
return (0);
}
if (d_align > scn_alignment)
scn_alignment = d_align;
}
scn_size = 0L;
STAILQ_FOREACH_SAFE(d, &s->s_data, d_next, td) {
if (e->e_flags & ELF_F_LAYOUT) {
if ((uint64_t) d->d_off + d->d_size > scn_size)
scn_size = d->d_off + d->d_size;
} else {
scn_size = roundup2(scn_size, scn_alignment);
d->d_off = scn_size;
scn_size += d->d_size;
}
}
/*
* If the application is requesting full control over the layout
* of the section, check its values for sanity.
*/
if (e->e_flags & ELF_F_LAYOUT) {
if (scn_alignment > sh_align || sh_offset % sh_align ||
sh_size < scn_size) {
LIBELF_SET_ERROR(LAYOUT, 0);
return (0);
}
} else {
/*
* Otherwise compute the values in the section header.
*/
if (scn_alignment > sh_align)
sh_align = scn_alignment;
/*
* If the section entry size is zero, try and fill in an
* appropriate entry size. Per the elf(5) manual page
* sections without fixed-size entries should have their
* 'sh_entsize' field set to zero.
*/
if (sh_entsize == 0 &&
(sh_entsize = _libelf_fsize(elftype, ec, e->e_version,
(size_t) 1)) == 1)
sh_entsize = 0;
sh_size = scn_size;
sh_offset = roundup(*rc, sh_align);
if (ec == ELFCLASS32) {
s->s_shdr.s_shdr32.sh_addralign = (uint32_t) sh_align;
s->s_shdr.s_shdr32.sh_entsize = (uint32_t) sh_entsize;
s->s_shdr.s_shdr32.sh_offset = (uint32_t) sh_offset;
s->s_shdr.s_shdr32.sh_size = (uint32_t) sh_size;
} else {
s->s_shdr.s_shdr64.sh_addralign = sh_align;
s->s_shdr.s_shdr64.sh_entsize = sh_entsize;
s->s_shdr.s_shdr64.sh_offset = sh_offset;
s->s_shdr.s_shdr64.sh_size = sh_size;
}
}
if ((size_t) *rc < sh_offset + sh_size)
*rc = sh_offset + sh_size;
s->s_size = sh_size;
s->s_offset = sh_offset;
return (1);
}
/*
* Insert a section in ascending order in the list
*/
static int
_libelf_insert_section(Elf *e, Elf_Scn *s)
{
Elf_Scn *t, *prevt;
uint64_t smax, smin, tmax, tmin;
smin = s->s_offset;
smax = smin + s->s_size;
prevt = NULL;
STAILQ_FOREACH(t, &e->e_u.e_elf.e_scn, s_next) {
tmin = t->s_offset;
tmax = tmin + t->s_size;
if (tmax <= smin) {
/*
* 't' lies entirely before 's': ...| t |...| s |...
*/
prevt = t;
continue;
} else if (smax <= tmin)
/*
* 's' lies entirely before 't', and after 'prevt':
* ...| prevt |...| s |...| t |...
*/
break;
else { /* 's' and 't' overlap. */
LIBELF_SET_ERROR(LAYOUT, 0);
return (0);
}
}
if (prevt)
STAILQ_INSERT_AFTER(&e->e_u.e_elf.e_scn, prevt, s, s_next);
else
STAILQ_INSERT_HEAD(&e->e_u.e_elf.e_scn, s, s_next);
return (1);
}
static off_t
_libelf_resync_sections(Elf *e, off_t rc)
{
int ec;
off_t nrc;
size_t sh_type, shdr_start, shdr_end;
Elf_Scn *s, *ts;
ec = e->e_class;
/*
* Make a pass through sections, computing the extent of each
* section. Order in increasing order of addresses.
*/
nrc = rc;
STAILQ_FOREACH(s, &e->e_u.e_elf.e_scn, s_next)
if (_libelf_compute_section_extents(e, s, &nrc) == 0)
return ((off_t) -1);
STAILQ_FOREACH_SAFE(s, &e->e_u.e_elf.e_scn, s_next, ts) {
if (ec == ELFCLASS32)
sh_type = s->s_shdr.s_shdr32.sh_type;
else
sh_type = s->s_shdr.s_shdr64.sh_type;
if (sh_type == SHT_NOBITS || sh_type == SHT_NULL)
continue;
if (s->s_offset < (uint64_t) rc) {
if (s->s_offset + s->s_size < (uint64_t) rc) {
/*
* Try insert this section in the
* correct place in the list,
* detecting overlaps if any.
*/
STAILQ_REMOVE(&e->e_u.e_elf.e_scn, s, _Elf_Scn,
s_next);
if (_libelf_insert_section(e, s) == 0)
return ((off_t) -1);
} else {
LIBELF_SET_ERROR(LAYOUT, 0);
return ((off_t) -1);
}
} else
rc = s->s_offset + s->s_size;
}
/*
* If the application is controlling file layout, check for an
* overlap between this section's extents and the SHDR table.
*/
if (e->e_flags & ELF_F_LAYOUT) {
if (e->e_class == ELFCLASS32)
shdr_start = e->e_u.e_elf.e_ehdr.e_ehdr32->e_shoff;
else
shdr_start = e->e_u.e_elf.e_ehdr.e_ehdr64->e_shoff;
shdr_end = shdr_start + _libelf_fsize(ELF_T_SHDR, e->e_class,
e->e_version, e->e_u.e_elf.e_nscn);
STAILQ_FOREACH(s, &e->e_u.e_elf.e_scn, s_next) {
if (s->s_offset >= shdr_end ||
s->s_offset + s->s_size <= shdr_start)
continue;
LIBELF_SET_ERROR(LAYOUT, 0);
return ((off_t) -1);
}
}
assert(nrc == rc);
return (rc);
}
static off_t
_libelf_resync_elf(Elf *e)
{
int ec, eh_class, eh_type;
unsigned int eh_byteorder, eh_version;
size_t align, fsz;
size_t phnum, shnum;
off_t rc, phoff, shoff;
void *ehdr;
Elf32_Ehdr *eh32;
Elf64_Ehdr *eh64;
rc = 0;
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
/*
* Prepare the EHDR.
*/
if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
return ((off_t) -1);
eh32 = ehdr;
eh64 = ehdr;
if (ec == ELFCLASS32) {
eh_byteorder = eh32->e_ident[EI_DATA];
eh_class = eh32->e_ident[EI_CLASS];
phoff = (uint64_t) eh32->e_phoff;
shoff = (uint64_t) eh32->e_shoff;
eh_type = eh32->e_type;
eh_version = eh32->e_version;
} else {
eh_byteorder = eh64->e_ident[EI_DATA];
eh_class = eh64->e_ident[EI_CLASS];
phoff = eh64->e_phoff;
shoff = eh64->e_shoff;
eh_type = eh64->e_type;
eh_version = eh64->e_version;
}
if (eh_version == EV_NONE)
eh_version = EV_CURRENT;
if (eh_version != e->e_version) { /* always EV_CURRENT */
LIBELF_SET_ERROR(VERSION, 0);
return ((off_t) -1);
}
if (eh_class != e->e_class) {
LIBELF_SET_ERROR(CLASS, 0);
return ((off_t) -1);
}
if (e->e_cmd != ELF_C_WRITE && eh_byteorder != e->e_byteorder) {
LIBELF_SET_ERROR(HEADER, 0);
return ((off_t) -1);
}
shnum = e->e_u.e_elf.e_nscn;
phnum = e->e_u.e_elf.e_nphdr;
e->e_byteorder = eh_byteorder;
#define INITIALIZE_EHDR(E,EC,V) do { \
(E)->e_ident[EI_MAG0] = ELFMAG0; \
(E)->e_ident[EI_MAG1] = ELFMAG1; \
(E)->e_ident[EI_MAG2] = ELFMAG2; \
(E)->e_ident[EI_MAG3] = ELFMAG3; \
(E)->e_ident[EI_CLASS] = (EC); \
(E)->e_ident[EI_VERSION] = (V); \
(E)->e_ehsize = _libelf_fsize(ELF_T_EHDR, (EC), (V), \
(size_t) 1); \
(E)->e_phentsize = (phnum == 0) ? 0 : _libelf_fsize( \
ELF_T_PHDR, (EC), (V), (size_t) 1); \
(E)->e_shentsize = _libelf_fsize(ELF_T_SHDR, (EC), (V), \
(size_t) 1); \
} while (0)
if (ec == ELFCLASS32)
INITIALIZE_EHDR(eh32, ec, eh_version);
else
INITIALIZE_EHDR(eh64, ec, eh_version);
(void) elf_flagehdr(e, ELF_C_SET, ELF_F_DIRTY);
rc += _libelf_fsize(ELF_T_EHDR, ec, eh_version, (size_t) 1);
/*
* Compute the layout the program header table, if one is
* present. The program header table needs to be aligned to a
* `natural' boundary.
*/
if (phnum) {
fsz = _libelf_fsize(ELF_T_PHDR, ec, eh_version, phnum);
align = _libelf_falign(ELF_T_PHDR, ec);
if (e->e_flags & ELF_F_LAYOUT) {
/*
* Check offsets for sanity.
*/
if (rc > phoff) {
LIBELF_SET_ERROR(HEADER, 0);
return ((off_t) -1);
}
if (phoff % align) {
LIBELF_SET_ERROR(LAYOUT, 0);
return ((off_t) -1);
}
} else
phoff = roundup(rc, align);
rc = phoff + fsz;
} else
phoff = 0;
/*
* Compute the layout of the sections associated with the
* file.
*/
if (e->e_cmd != ELF_C_WRITE &&
(e->e_flags & LIBELF_F_SHDRS_LOADED) == 0 &&
_libelf_load_section_headers(e, ehdr) == 0)
return ((off_t) -1);
if ((rc = _libelf_resync_sections(e, rc)) < 0)
return ((off_t) -1);
/*
* Compute the space taken up by the section header table, if
* one is needed. If ELF_F_LAYOUT is asserted, the
* application may have placed the section header table in
* between existing sections, so the net size of the file need
* not increase due to the presence of the section header
* table.
*/
if (shnum) {
fsz = _libelf_fsize(ELF_T_SHDR, ec, eh_version, (size_t) 1);
align = _libelf_falign(ELF_T_SHDR, ec);
if (e->e_flags & ELF_F_LAYOUT) {
if (shoff % align) {
LIBELF_SET_ERROR(LAYOUT, 0);
return ((off_t) -1);
}
} else
shoff = roundup(rc, align);
if (shoff + fsz * shnum > (size_t) rc)
rc = shoff + fsz * shnum;
} else
shoff = 0;
/*
* Set the fields of the Executable Header that could potentially use
* extended numbering.
*/
_libelf_setphnum(e, ehdr, ec, phnum);
_libelf_setshnum(e, ehdr, ec, shnum);
/*
* Update the `e_phoff' and `e_shoff' fields if the library is
* doing the layout.
*/
if ((e->e_flags & ELF_F_LAYOUT) == 0) {
if (ec == ELFCLASS32) {
eh32->e_phoff = (uint32_t) phoff;
eh32->e_shoff = (uint32_t) shoff;
} else {
eh64->e_phoff = (uint64_t) phoff;
eh64->e_shoff = (uint64_t) shoff;
}
}
return (rc);
}
/*
* Write out the contents of a section.
*/
static off_t
_libelf_write_scn(Elf *e, char *nf, Elf_Scn *s, off_t rc)
{
int ec;
size_t fsz, msz, nobjects;
uint32_t sh_type;
uint64_t sh_off, sh_size;
int elftype;
Elf_Data *d, dst;
if ((ec = e->e_class) == ELFCLASS32) {
sh_type = s->s_shdr.s_shdr32.sh_type;
sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size;
} else {
sh_type = s->s_shdr.s_shdr64.sh_type;
sh_size = s->s_shdr.s_shdr64.sh_size;
}
/*
* Ignore sections that do not allocate space in the file.
*/
if (sh_type == SHT_NOBITS || sh_type == SHT_NULL || sh_size == 0)
return (rc);
elftype = _libelf_xlate_shtype(sh_type);
assert(elftype >= ELF_T_FIRST && elftype <= ELF_T_LAST);
msz = _libelf_msize(elftype, ec, e->e_version);
sh_off = s->s_offset;
assert(sh_off % _libelf_falign(elftype, ec) == 0);
/*
* If the section has a `rawdata' descriptor, and the section
* contents have not been modified, use its contents directly.
* The `s_rawoff' member contains the offset into the original
* file, while `s_offset' contains its new location in the
* destination.
*/
if (STAILQ_EMPTY(&s->s_data)) {
if ((d = elf_rawdata(s, NULL)) == NULL)
return ((off_t) -1);
STAILQ_FOREACH(d, &s->s_rawdata, d_next) {
if ((uint64_t) rc < sh_off + d->d_off)
(void) memset(nf + rc,
LIBELF_PRIVATE(fillchar), sh_off +
d->d_off - rc);
rc = sh_off + d->d_off;
assert(d->d_buf != NULL);
assert(d->d_type == ELF_T_BYTE);
assert(d->d_version == e->e_version);
(void) memcpy(nf + rc,
e->e_rawfile + s->s_rawoff + d->d_off, d->d_size);
rc += d->d_size;
}
return (rc);
}
/*
* Iterate over the set of data descriptors for this section.
* The prior call to _libelf_resync_elf() would have setup the
* descriptors for this step.
*/
dst.d_version = e->e_version;
STAILQ_FOREACH(d, &s->s_data, d_next) {
if ((uint64_t) rc < sh_off + d->d_off)
(void) memset(nf + rc,
LIBELF_PRIVATE(fillchar), sh_off + d->d_off - rc);
rc = sh_off + d->d_off;
assert(d->d_buf != NULL);
assert(d->d_type == (Elf_Type) elftype);
assert(d->d_version == e->e_version);
assert(d->d_size % msz == 0);
nobjects = d->d_size / msz;
fsz = _libelf_fsize(elftype, ec, e->e_version, nobjects);
dst.d_buf = nf + rc;
dst.d_size = fsz;
if (_libelf_xlate(&dst, d, e->e_byteorder, ec, ELF_TOFILE) ==
NULL)
return ((off_t) -1);
rc += fsz;
}
return ((off_t) rc);
}
/*
* Write out the file image.
*
* The original file could have been mapped in with an ELF_C_RDWR
* command and the application could have added new content or
* re-arranged its sections before calling elf_update(). Consequently
* its not safe to work `in place' on the original file. So we
* malloc() the required space for the updated ELF object and build
* the object there and write it out to the underlying file at the
* end. Note that the application may have opened the underlying file
* in ELF_C_RDWR and only retrieved/modified a few sections. We take
* care to avoid translating file sections unnecessarily.
*
* Gaps in the coverage of the file by the file's sections will be
* filled with the fill character set by elf_fill(3).
*/
static off_t
_libelf_write_elf(Elf *e, off_t newsize)
{
int ec;
off_t maxrc, rc;
size_t fsz, msz, phnum, shnum;
uint64_t phoff, shoff;
void *ehdr;
char *newfile;
Elf_Data dst, src;
Elf_Scn *scn, *tscn;
Elf32_Ehdr *eh32;
Elf64_Ehdr *eh64;
assert(e->e_kind == ELF_K_ELF);
assert(e->e_cmd != ELF_C_READ);
assert(e->e_fd >= 0);
if ((newfile = malloc((size_t) newsize)) == NULL) {
LIBELF_SET_ERROR(RESOURCE, errno);
return ((off_t) -1);
}
ec = e->e_class;
ehdr = _libelf_ehdr(e, ec, 0);
assert(ehdr != NULL);
phnum = e->e_u.e_elf.e_nphdr;
if (ec == ELFCLASS32) {
eh32 = (Elf32_Ehdr *) ehdr;
phoff = (uint64_t) eh32->e_phoff;
shnum = eh32->e_shnum;
shoff = (uint64_t) eh32->e_shoff;
} else {
eh64 = (Elf64_Ehdr *) ehdr;
phoff = eh64->e_phoff;
shnum = eh64->e_shnum;
shoff = eh64->e_shoff;
}
fsz = _libelf_fsize(ELF_T_EHDR, ec, e->e_version, (size_t) 1);
msz = _libelf_msize(ELF_T_EHDR, ec, e->e_version);
(void) memset(&dst, 0, sizeof(dst));
(void) memset(&src, 0, sizeof(src));
src.d_buf = ehdr;
src.d_size = msz;
src.d_type = ELF_T_EHDR;
src.d_version = dst.d_version = e->e_version;
rc = 0;
dst.d_buf = newfile + rc;
dst.d_size = fsz;
if (_libelf_xlate(&dst, &src, e->e_byteorder, ec, ELF_TOFILE) ==
NULL)
goto error;
rc += fsz;
/*
* Write the program header table if present.
*/
if (phnum != 0 && phoff != 0) {
assert((unsigned) rc <= phoff);
fsz = _libelf_fsize(ELF_T_PHDR, ec, e->e_version, phnum);
assert(phoff % _libelf_falign(ELF_T_PHDR, ec) == 0);
assert(fsz > 0);
src.d_buf = _libelf_getphdr(e, ec);
src.d_version = dst.d_version = e->e_version;
src.d_type = ELF_T_PHDR;
src.d_size = phnum * _libelf_msize(ELF_T_PHDR, ec,
e->e_version);
dst.d_size = fsz;
if ((uint64_t) rc < phoff)
(void) memset(newfile + rc,
LIBELF_PRIVATE(fillchar), phoff - rc);
dst.d_buf = newfile + rc;
if (_libelf_xlate(&dst, &src, e->e_byteorder, ec, ELF_TOFILE) ==
NULL)
goto error;
rc = phoff + fsz;
}
/*
* Write out individual sections.
*/
STAILQ_FOREACH(scn, &e->e_u.e_elf.e_scn, s_next)
if ((rc = _libelf_write_scn(e, newfile, scn, rc)) < 0)
goto error;
/*
* Write out the section header table, if required. Note that
* if flag ELF_F_LAYOUT has been set the section header table
* could reside in between byte ranges mapped by section
* descriptors.
*/
if (shnum != 0 && shoff != 0) {
if ((uint64_t) rc < shoff)
(void) memset(newfile + rc,
LIBELF_PRIVATE(fillchar), shoff - rc);
maxrc = rc;
rc = shoff;
assert(rc % _libelf_falign(ELF_T_SHDR, ec) == 0);
src.d_type = ELF_T_SHDR;
src.d_size = _libelf_msize(ELF_T_SHDR, ec, e->e_version);
src.d_version = dst.d_version = e->e_version;
fsz = _libelf_fsize(ELF_T_SHDR, ec, e->e_version, (size_t) 1);
STAILQ_FOREACH(scn, &e->e_u.e_elf.e_scn, s_next) {
if (ec == ELFCLASS32)
src.d_buf = &scn->s_shdr.s_shdr32;
else
src.d_buf = &scn->s_shdr.s_shdr64;
dst.d_size = fsz;
dst.d_buf = newfile + rc + scn->s_ndx * fsz;
if (_libelf_xlate(&dst, &src, e->e_byteorder, ec,
ELF_TOFILE) != &dst)
goto error;
}
rc += e->e_u.e_elf.e_nscn * fsz;
if (maxrc > rc)
rc = maxrc;
}
assert(rc == newsize);
/*
* Write out the constructed contents and remap the file in
* read-only.
*/
if (e->e_rawfile && munmap(e->e_rawfile, e->e_rawsize) < 0) {
LIBELF_SET_ERROR(IO, errno);
goto error;
}
if (write(e->e_fd, newfile, (size_t) newsize) != newsize ||
lseek(e->e_fd, (off_t) 0, SEEK_SET) < 0) {
LIBELF_SET_ERROR(IO, errno);
goto error;
}
if (e->e_cmd != ELF_C_WRITE) {
if ((e->e_rawfile = mmap(NULL, (size_t) newsize, PROT_READ,
MAP_PRIVATE, e->e_fd, (off_t) 0)) == MAP_FAILED) {
LIBELF_SET_ERROR(IO, errno);
goto error;
}
e->e_rawsize = newsize;
}
/*
* Reset flags, remove existing section descriptors and
* {E,P}HDR pointers so that a subsequent elf_get{e,p}hdr()
* and elf_getscn() will function correctly.
*/
e->e_flags &= ~ELF_F_DIRTY;
STAILQ_FOREACH_SAFE(scn, &e->e_u.e_elf.e_scn, s_next, tscn)
_libelf_release_scn(scn);
if (ec == ELFCLASS32) {
free(e->e_u.e_elf.e_ehdr.e_ehdr32);
if (e->e_u.e_elf.e_phdr.e_phdr32)
free(e->e_u.e_elf.e_phdr.e_phdr32);
e->e_u.e_elf.e_ehdr.e_ehdr32 = NULL;
e->e_u.e_elf.e_phdr.e_phdr32 = NULL;
} else {
free(e->e_u.e_elf.e_ehdr.e_ehdr64);
if (e->e_u.e_elf.e_phdr.e_phdr64)
free(e->e_u.e_elf.e_phdr.e_phdr64);
e->e_u.e_elf.e_ehdr.e_ehdr64 = NULL;
e->e_u.e_elf.e_phdr.e_phdr64 = NULL;
}
free(newfile);
return (rc);
error:
free(newfile);
return ((off_t) -1);
}
off_t
elf_update(Elf *e, Elf_Cmd c)
{
int ec;
off_t rc;
rc = (off_t) -1;
if (e == NULL || e->e_kind != ELF_K_ELF ||
(c != ELF_C_NULL && c != ELF_C_WRITE)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (rc);
}
if ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) {
LIBELF_SET_ERROR(CLASS, 0);
return (rc);
}
if (e->e_version == EV_NONE)
e->e_version = EV_CURRENT;
if (c == ELF_C_WRITE && e->e_cmd == ELF_C_READ) {
LIBELF_SET_ERROR(MODE, 0);
return (rc);
}
if ((rc = _libelf_resync_elf(e)) < 0)
return (rc);
if (c == ELF_C_NULL)
return (rc);
if (e->e_cmd == ELF_C_READ) {
/*
* This descriptor was opened in read-only mode or by
* elf_memory().
*/
if (e->e_fd)
LIBELF_SET_ERROR(MODE, 0);
else
LIBELF_SET_ERROR(ARGUMENT, 0);
return ((off_t) -1);
}
if (e->e_fd < 0) {
LIBELF_SET_ERROR(SEQUENCE, 0);
return ((off_t) -1);
}
return (_libelf_write_elf(e, rc));
}

95
lib/libelf/elf_version.3 Normal file
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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd June 1, 2006
.Os
.Dt ELF_VERSION 3
.Sh NAME
.Nm elf_version
.Nd retrieve or set ELF library operating version
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft unsigned int
.Fn elf_version "unsigned int version"
.Sh DESCRIPTION
The
.Fn elf_version
function is used to query the current operating version of the ELF
library, and to inform the ELF library about the application's desired
operating version.
.Pp
If the argument
.Ar version
is
.Dv EV_NONE ,
the
.Fn elf_version
function returns the currently configured operating version for the
ELF library.
.Pp
If the argument
.Ar version
is not
.Dv EV_NONE ,
and if argument
.Ar version
is supported by the ELF library, function
.Fn elf_version
sets the library's operating version to
.Ar version ,
and returns the previous value of the operating version.
If argument
.Ar version
cannot be supported, then the
.Fn elf_version
function returns
.Dv EV_NONE .
.Sh RETURN VALUES
The
.Fn elf_version
function returns the currently configured ELF library version, or
.Dv EV_NONE
if an unsupported version is requested.
.Sh EXAMPLES
An application program would inform the ELF library about its desired
operating version and check for an error using the following code
snippet:
.Bd -literal -offset indent
if (elf_version(EV_CURRENT) == EV_NONE)
err(EX_SOFTWARE, "ELF library too old");
.Ed
.Sh ERRORS
Function
.Fn elf_version
may fail with the following error:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er "ELF_E_VERSION"
An unsupported library version number was requested.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr gelf 3

52
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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
unsigned int
elf_version(unsigned int v)
{
unsigned int old;
if ((old = LIBELF_PRIVATE(version)) == EV_NONE)
old = EV_CURRENT;
if (v == EV_NONE)
return old;
if (v > EV_CURRENT) {
LIBELF_SET_ERROR(VERSION, 0);
return EV_NONE;
}
LIBELF_PRIVATE(version) = v;
return (old);
}

2529
lib/libelf/elfdefinitions.h Normal file
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201
lib/libelf/gelf.3 Normal file
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@ -0,0 +1,201 @@
.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd September 1, 2006
.Os
.Dt GELF 3
.Sh NAME
.Nm GElf
.Nd class-independent API for ELF manipulation
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In gelf.h
.Sh DESCRIPTION
This manual page describes a class independent API for manipulating
ELF objects.
This API allows an application to operate on ELF descriptors without
needing to the know the ELF class of the descriptor.
.Pp
The GElf API may be used alongside the ELF API without restriction.
.Ss GElf Data Structures
The GElf API defines the following class-independent data structures:
.Bl -tag -width GElf_Sxword
.It Vt GElf_Addr
A representation of ELF addresses.
.It Vt GElf_Dyn
A class-independent representation of ELF
.Sy .dynamic
section entries.
.It Vt GElf_Ehdr
A class-independent representation of an ELF Executable Header.
.It Vt GElf_Half
An unsigned 16 bit quantity.
.It Vt GElf_Off
A class-independent representation of a ELF offset.
.It Vt GElf_Phdr
A class-independent representation of an ELF Program Header Table
entry.
.It Vt GElf_Rel
A class-independent representation of an ELF relocation entry.
.It Vt GElf_Rela
A class-independent representation of an ELF relocation entry with
addend.
.It Vt GElf_Shdr
A class-independent representation of an ELF Section Header Table
entry.
.It Vt GElf_Sword
A signed 32 bit quantity.
.It Vt GElf_Sxword
A signed 64 bit quantity.
.It Vt GElf_Sym
A class-independent representation of an ELF symbol table entry.
.It Vt GElf_Word
An unsigned 32 bit quantity.
.It Vt GElf_Xword
An unsigned 64 bit quantity.
.El
.Pp
These data structures are sized to be compatible with the
corresponding 64 bit ELF structures, and have the same internal
structure as their 64 bit class-dependent counterparts.
Class-dependent ELF structures are described in
.Xr elf 5 .
.Ss GElf Programming Model
GElf functions always return a
.Em copy
of the underlying (class-dependent) ELF data structure.
The programming model with GElf is as follows:
.Bl -enum
.It
An application will retrieve data from an ELF descriptor using a
.Fn gelf_get_*
function.
This will copy out data into a private
.Vt GElf_*
data structure.
.It
The application will work with its private copy of the GElf
structure.
.It
Once done, the application copies the new values back to the
underlying ELF data structure using the
.Fn gelf_update_*
functions.
.It
The application will then use the
.Fn elf_flag*
APIs to indicate to the ELF library that an ELF data structure is dirty.
.El
.Pp
When updating an underlying 32 bit ELF data structure, the GElf
routines will signal an error if a GElf value is out of range
for the underlying ELF data type.
.Ss Namespace use
The GElf interface uses the following symbols:
.Bl -tag
.It GElf_*
Class-independent data types.
.It gelf_*
For functions defined in the API set.
.El
.Ss GElf Programming APIs
This section provides an overview of the GElf programming APIs.
Further information is provided in the manual page of each function
listed here.
.Bl -tag
.It "Allocating ELF Data Structures"
.Bl -tag -compact
.It Fn gelf_newehdr
Allocate a new ELF Executable Header.
.It Fn gelf_newphdr
Allocate a new ELF Program Header Table.
.El
.It "Data Translation"
.Bl -tag -compact
.It Fn gelf_xlatetof
Translate the native representation of an ELF data structure to its
file representation.
.It Fn gelf_xlatetom
Translate from the file representation of an ELF data structure to a
native representation.
.El
.It "Retrieving ELF Data"
.Bl -tag -compact
.It Fn gelf_getdyn
Retrieve an ELF
.Sy .dynamic
table entry.
.It Fn gelf_getehdr
Retrieve an ELF Executable Header from the underlying ELF descriptor.
.It Fn gelf_getphdr
Retrieve an ELF Program Header Table entry from the underlying ELF descriptor.
.It Fn gelf_getrel
Retrieve an ELF relocation entry.
.It Fn gelf_getrela
Retrieve an ELF relocation entry with addend.
.It Fn gelf_getshdr
Retrieve an ELF Section Header Table entry from the underlying ELF descriptor.
.It Fn gelf_getsym
Retrieve an ELF symbol table entry.
.El
.It Queries
.Bl -tag -compact
.It Fn gelf_checksum
Retrieves the ELF checksum for an ELF descriptor.
.It Fn gelf_fsize
Retrieves the size of the file representation of an ELF type.
.It Fn gelf_getclass
Retrieves the ELF class of an ELF descriptor.
.El
.It "Updating ELF Data"
.Bl -tag -compact -width ".Fn gelf_update_shdr"
.It Fn gelf_update_dyn
Copy back an ELF
.Sy .dynamic
Table entry.
.It Fn gelf_update_phdr
Copy back an ELF Program Header Table entry.
.It Fn gelf_update_rel
Copy back an ELF relocation entry.
.It Fn gelf_update_rela
Copy back an ELF relocation with addend entry.
.It Fn gelf_update_shdr
Copy back an ELF Section Header Table entry.
.It Fn gelf_update_sym
Copy back an ELF symbol table entry.
.El
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf 5
.Sh HISTORY
The GELF(3) API first appeared in System V Release 4.
This implementation of the API first appeared in
.Fx 7.0 .
.Sh AUTHORS
The GElf API was implemented by
.An "Joseph Koshy"
.Aq jkoshy@FreeBSD.org .

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
*/
#ifndef _GELF_H_
#define _GELF_H_
#include <sys/cdefs.h>
#include <libelf.h>
typedef Elf64_Addr GElf_Addr; /* Addresses */
typedef Elf64_Half GElf_Half; /* Half words (16 bit) */
typedef Elf64_Off GElf_Off; /* Offsets */
typedef Elf64_Sword GElf_Sword; /* Signed words (32 bit) */
typedef Elf64_Sxword GElf_Sxword; /* Signed long words (64 bit) */
typedef Elf64_Word GElf_Word; /* Unsigned words (32 bit) */
typedef Elf64_Xword GElf_Xword; /* Unsigned long words (64 bit) */
typedef Elf64_Dyn GElf_Dyn; /* ".dynamic" section entries */
typedef Elf64_Ehdr GElf_Ehdr; /* ELF header */
typedef Elf64_Phdr GElf_Phdr; /* Program header */
typedef Elf64_Shdr GElf_Shdr; /* Section header */
typedef Elf64_Sym GElf_Sym; /* Symbol table entries */
typedef Elf64_Rel GElf_Rel; /* Relocation entries */
typedef Elf64_Rela GElf_Rela; /* Relocation entries with addend */
typedef Elf64_Cap GElf_Cap; /* SW/HW capabilities */
typedef Elf64_Move GElf_Move; /* Move entries */
typedef Elf64_Syminfo GElf_Syminfo; /* Symbol information */
#define GELF_M_INFO ELF64_M_INFO
#define GELF_M_SIZE ELF64_M_SIZE
#define GELF_M_SYM ELF64_M_SYM
#define GELF_R_INFO ELF64_R_INFO
#define GELF_R_SYM ELF64_R_SYM
#define GELF_R_TYPE ELF64_R_TYPE
#define GELF_R_TYPE_DATA ELF64_R_TYPE_DATA
#define GELF_R_TYPE_ID ELF64_R_TYPE_ID
#define GELF_R_TYPE_INFO ELF64_R_TYPE_INFO
#define GELF_ST_BIND ELF64_ST_BIND
#define GELF_ST_INFO ELF64_ST_INFO
#define GELF_ST_TYPE ELF64_ST_TYPE
#define GELF_ST_VISIBILITY ELF64_ST_VISIBILITY
__BEGIN_DECLS
long gelf_checksum(Elf *_elf);
size_t gelf_fsize(Elf *_elf, Elf_Type _type, size_t _count,
unsigned int _version);
int gelf_getclass(Elf *_elf);
GElf_Dyn *gelf_getdyn(Elf_Data *_data, int _index, GElf_Dyn *_dst);
GElf_Ehdr *gelf_getehdr(Elf *_elf, GElf_Ehdr *_dst);
GElf_Phdr *gelf_getphdr(Elf *_elf, int _index, GElf_Phdr *_dst);
GElf_Rel *gelf_getrel(Elf_Data *_src, int _index, GElf_Rel *_dst);
GElf_Rela *gelf_getrela(Elf_Data *_src, int _index, GElf_Rela *_dst);
GElf_Shdr *gelf_getshdr(Elf_Scn *_scn, GElf_Shdr *_dst);
GElf_Sym *gelf_getsym(Elf_Data *_src, int _index, GElf_Sym *_dst);
GElf_Sym *gelf_getsymshndx(Elf_Data *_src, Elf_Data *_shindexsrc,
int _index, GElf_Sym *_dst, Elf32_Word *_shindexdst);
void * gelf_newehdr(Elf *_elf, int _class);
void * gelf_newphdr(Elf *_elf, size_t _phnum);
int gelf_update_dyn(Elf_Data *_dst, int _index, GElf_Dyn *_src);
int gelf_update_ehdr(Elf *_elf, GElf_Ehdr *_src);
int gelf_update_phdr(Elf *_elf, int _index, GElf_Phdr *_src);
int gelf_update_rel(Elf_Data *_dst, int _index, GElf_Rel *_src);
int gelf_update_rela(Elf_Data *_dst, int _index, GElf_Rela *_src);
int gelf_update_shdr(Elf_Scn *_dst, GElf_Shdr *_src);
int gelf_update_sym(Elf_Data *_dst, int _index, GElf_Sym *_src);
int gelf_update_symshndx(Elf_Data *_symdst, Elf_Data *_shindexdst,
int _index, GElf_Sym *_symsrc, Elf32_Word _shindexsrc);
Elf_Data *gelf_xlatetof(Elf *_elf, Elf_Data *_dst, const Elf_Data *_src, unsigned int _encode);
Elf_Data *gelf_xlatetom(Elf *_elf, Elf_Data *_dst, const Elf_Data *_src, unsigned int _encode);
GElf_Cap *gelf_getcap(Elf_Data *_data, int _index, GElf_Cap *_cap);
GElf_Move *gelf_getmove(Elf_Data *_src, int _index, GElf_Move *_dst);
GElf_Syminfo *gelf_getsyminfo(Elf_Data *_src, int _index, GElf_Syminfo *_dst);
int gelf_update_cap(Elf_Data *_dst, int _index, GElf_Cap *_src);
int gelf_update_move(Elf_Data *_dst, int _index, GElf_Move *_src);
int gelf_update_syminfo(Elf_Data *_dst, int _index, GElf_Syminfo *_src);
__END_DECLS
#endif /* _GELF_H_ */

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <assert.h>
#include <gelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
GElf_Cap *
gelf_getcap(Elf_Data *d, int ndx, GElf_Cap *dst)
{
int ec;
Elf *e;
Elf_Scn *scn;
Elf32_Cap *cap32;
Elf64_Cap *cap64;
size_t msz;
uint32_t sh_type;
if (d == NULL || ndx < 0 || dst == NULL ||
(scn = d->d_scn) == NULL ||
(e = scn->s_elf) == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32)
sh_type = scn->s_shdr.s_shdr32.sh_type;
else
sh_type = scn->s_shdr.s_shdr64.sh_type;
if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
msz = _libelf_msize(ELF_T_CAP, ec, e->e_version);
assert(msz > 0);
if (msz * ndx >= d->d_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if (ec == ELFCLASS32) {
cap32 = (Elf32_Cap *) d->d_buf + ndx;
dst->c_tag = cap32->c_tag;
dst->c_un.c_val = (Elf64_Xword) cap32->c_un.c_val;
} else {
cap64 = (Elf64_Cap *) d->d_buf + ndx;
*dst = *cap64;
}
return (dst);
}
int
gelf_update_cap(Elf_Data *d, int ndx, GElf_Cap *gc)
{
int ec;
Elf *e;
Elf_Scn *scn;
Elf32_Cap *cap32;
Elf64_Cap *cap64;
size_t msz;
uint32_t sh_type;
if (d == NULL || ndx < 0 || gc == NULL ||
(scn = d->d_scn) == NULL ||
(e = scn->s_elf) == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32)
sh_type = scn->s_shdr.s_shdr32.sh_type;
else
sh_type = scn->s_shdr.s_shdr64.sh_type;
if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
msz = _libelf_msize(ELF_T_CAP, ec, e->e_version);
assert(msz > 0);
if (msz * ndx >= d->d_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if (ec == ELFCLASS32) {
cap32 = (Elf32_Cap *) d->d_buf + ndx;
LIBELF_COPY_U32(cap32, gc, c_tag);
LIBELF_COPY_U32(cap32, gc, c_un.c_val);
} else {
cap64 = (Elf64_Cap *) d->d_buf + ndx;
*cap64 = *gc;
}
return (1);
}

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 29, 2006
.Os
.Dt GELF_CHECKSUM 3
.Sh NAME
.Nm elf32_checksum ,
.Nm elf64_checksum ,
.Nm gelf_checksum
.Nd return the checksum of an ELF object
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft long
.Fn elf32_checksum "Elf *elf"
.Ft long
.Fn elf64_checksum "Elf *elf"
.In gelf.h
.Ft long
.Fn gelf_checksum "Elf *elf"
.Sh DESCRIPTION
These functions return a simple checksum of the ELF object described
by their argument
.Ar elf .
The checksum is computed in way that allows its value to remain
unchanged in presence of modifications to the ELF object by utilities
like
.Xr strip 1 .
.Pp
Function
.Fn elf32_checksum
returns a checksum for an ELF descriptor
.Ar elf
of class
.Dv ELFCLASS32 .
.Pp
Function
.Fn elf64_checksum
returns a checksum for an ELF descriptor
.Ar elf
of class
.Dv ELFCLASS64 .
.Pp
Function
.Fn gelf_checksum
provides a class-independent way retrieving the checksum
for ELF object
.Ar elf .
.Sh RETURN VALUES
These functions return the checksum of the ELF object, or zero in case
an error was encountered.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not a descriptor for an ELF file.
.It Bq Er ELF_E_ARGUMENT
The ELF descriptor
.Ar elf
was not opened for reading or updating.
.It Bq Er ELF_E_CLASS
For functions
.Fn elf32_checksum
and
.Fn elf64_checksum ,
ELF descriptor
.Ar elf
did not match the class of the called function.
.It Bq Er ELF_E_HEADER
The ELF object specified by argument
.Ar elf
had a malformed executable header.
.It Bq Er ELF_E_RESOURCE
An out of memory condition was detected during processing.
.It Bq Er ELF_E_SECTION
The ELF object specified by argument
.Ar elf
contained a section with a malformed section header.
.It Bq Er ELF_E_VERSION
The ELF object was of an unsupported version.
.El
.Sh SEE ALSO
.Xr strip 1 ,
.Xr elf 3 ,
.Xr gelf 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <gelf.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
long
elf32_checksum(Elf *e)
{
return (_libelf_checksum(e, ELFCLASS32));
}
long
elf64_checksum(Elf *e)
{
return (_libelf_checksum(e, ELFCLASS64));
}
long
gelf_checksum(Elf *e)
{
int ec;
if (e == NULL ||
((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0L);
}
return (_libelf_checksum(e, ec));
}

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <assert.h>
#include <gelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
GElf_Dyn *
gelf_getdyn(Elf_Data *d, int ndx, GElf_Dyn *dst)
{
int ec;
Elf *e;
Elf_Scn *scn;
Elf32_Dyn *dyn32;
Elf64_Dyn *dyn64;
size_t msz;
uint32_t sh_type;
if (d == NULL || ndx < 0 || dst == NULL ||
(scn = d->d_scn) == NULL ||
(e = scn->s_elf) == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32)
sh_type = scn->s_shdr.s_shdr32.sh_type;
else
sh_type = scn->s_shdr.s_shdr64.sh_type;
if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
msz = _libelf_msize(ELF_T_DYN, ec, e->e_version);
assert(msz > 0);
if (msz * ndx >= d->d_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if (ec == ELFCLASS32) {
dyn32 = (Elf32_Dyn *) d->d_buf + ndx;
dst->d_tag = dyn32->d_tag;
dst->d_un.d_val = (Elf64_Xword) dyn32->d_un.d_val;
} else {
dyn64 = (Elf64_Dyn *) d->d_buf + ndx;
*dst = *dyn64;
}
return (dst);
}
int
gelf_update_dyn(Elf_Data *d, int ndx, GElf_Dyn *ds)
{
int ec;
Elf *e;
Elf_Scn *scn;
Elf32_Dyn *dyn32;
Elf64_Dyn *dyn64;
size_t msz;
uint32_t sh_type;
if (d == NULL || ndx < 0 || ds == NULL ||
(scn = d->d_scn) == NULL ||
(e = scn->s_elf) == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32)
sh_type = scn->s_shdr.s_shdr32.sh_type;
else
sh_type = scn->s_shdr.s_shdr64.sh_type;
if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
msz = _libelf_msize(ELF_T_DYN, ec, e->e_version);
assert(msz > 0);
if (msz * ndx >= d->d_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if (ec == ELFCLASS32) {
dyn32 = (Elf32_Dyn *) d->d_buf + ndx;
LIBELF_COPY_S32(dyn32, ds, d_tag);
LIBELF_COPY_U32(dyn32, ds, d_un.d_val);
} else {
dyn64 = (Elf64_Dyn *) d->d_buf + ndx;
*dyn64 = *ds;
}
return (1);
}

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <assert.h>
#include <gelf.h>
#include <libelf.h>
#include <string.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
Elf32_Ehdr *
elf32_getehdr(Elf *e)
{
return (_libelf_ehdr(e, ELFCLASS32, 0));
}
Elf64_Ehdr *
elf64_getehdr(Elf *e)
{
return (_libelf_ehdr(e, ELFCLASS64, 0));
}
GElf_Ehdr *
gelf_getehdr(Elf *e, GElf_Ehdr *d)
{
int ec;
Elf32_Ehdr *eh32;
Elf64_Ehdr *eh64;
if (d == NULL || e == NULL ||
((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if (ec == ELFCLASS32) {
if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL)
return (NULL);
(void) memcpy(d->e_ident, eh32->e_ident, sizeof(eh32->e_ident));
d->e_type = eh32->e_type;
d->e_machine = eh32->e_machine;
d->e_version = eh32->e_version;
d->e_entry = eh32->e_entry;
d->e_phoff = eh32->e_phoff;
d->e_shoff = eh32->e_shoff;
d->e_flags = eh32->e_flags;
d->e_ehsize = eh32->e_ehsize;
d->e_phentsize = eh32->e_phentsize;
d->e_phnum = eh32->e_phnum;
d->e_shentsize = eh32->e_shentsize;
d->e_shnum = eh32->e_shnum;
d->e_shstrndx = eh32->e_shstrndx;
return (d);
}
assert(ec == ELFCLASS64);
if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL)
return (NULL);
*d = *eh64;
return (d);
}
Elf32_Ehdr *
elf32_newehdr(Elf *e)
{
return (_libelf_ehdr(e, ELFCLASS32, 1));
}
Elf64_Ehdr *
elf64_newehdr(Elf *e)
{
return (_libelf_ehdr(e, ELFCLASS64, 1));
}
void *
gelf_newehdr(Elf *e, int ec)
{
if (e != NULL &&
(ec == ELFCLASS32 || ec == ELFCLASS64))
return (_libelf_ehdr(e, ec, 1));
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
int
gelf_update_ehdr(Elf *e, GElf_Ehdr *s)
{
int ec;
void *ehdr;
Elf32_Ehdr *eh32;
Elf64_Ehdr *eh64;
if (s== NULL || e == NULL || e->e_kind != ELF_K_ELF ||
((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if (e->e_cmd == ELF_C_READ) {
LIBELF_SET_ERROR(MODE, 0);
return (0);
}
if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
return (0);
(void) elf_flagehdr(e, ELF_C_SET, ELF_F_DIRTY);
if (ec == ELFCLASS64) {
eh64 = (Elf64_Ehdr *) ehdr;
*eh64 = *s;
return (1);
}
eh32 = (Elf32_Ehdr *) ehdr;
(void) memcpy(eh32->e_ident, s->e_ident, sizeof(eh32->e_ident));
eh32->e_type = s->e_type;
eh32->e_machine = s->e_machine;
eh32->e_version = s->e_version;
LIBELF_COPY_U32(eh32, s, e_entry);
LIBELF_COPY_U32(eh32, s, e_phoff);
LIBELF_COPY_U32(eh32, s, e_shoff);
eh32->e_flags = s->e_flags;
eh32->e_ehsize = s->e_ehsize;
eh32->e_phentsize = s->e_phentsize;
eh32->e_phnum = s->e_phnum;
eh32->e_shentsize = s->e_shentsize;
eh32->e_shnum = s->e_shnum;
eh32->e_shstrndx = s->e_shstrndx;
return (1);
}

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd February 5, 2008
.Os
.Dt GELF_FSIZE 3
.Sh NAME
.Nm gelf_fsize ,
.Nm elf32_fsize ,
.Nm elf64_fsize
.Nd return the size of a file type
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft size_t
.Fn elf32_fsize "Elf_Type type" "size_t count" "unsigned int version"
.Ft size_t
.Fn elf64_fsize "Elf_Type type" "size_t count" "unsigned int version"
.In gelf.h
.Ft size_t
.Fn gelf_fsize "Elf *elf" "Elf_Type type" "size_t count" "unsigned int version"
.Sh DESCRIPTION
These functions return the size in bytes of the file representation of
.Ar count
numbers of objects of ELF type
.Ar type .
For ELF types that are of variable length, these functions return a
size of one byte.
.Pp
Functions
.Fn elf32_fsize
and
.Fn elf64_fsize
return sizes for files of class
.Dv ELFCLASS32
and
.Dv ELFCLASS64
respectively.
Function
.Fn gelf_fsize
returns the size for the class of ELF descriptor
.Ar elf .
.Sh RETURN VALUES
These functions return a non-zero value in case of success, or zero in
case of an error.
.Sh ERRORS
These functions may fail with:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was NULL in a call to
.Fn gelf_fsize .
.It Bq Er ELF_E_ARGUMENT
ELF descriptor
.Ar elf
had an unknown ELF class.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar type
contained an illegal value.
.It Bq Er ELF_E_UNIMPL
Support for ELF type
.Ar type
has not been implemented.
.It Bq Er ELF_E_VERSION
Argument
.Ar version
is not a supported version.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr gelf 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <gelf.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
size_t
elf32_fsize(Elf_Type t, size_t c, unsigned int v)
{
return (_libelf_fsize(t, ELFCLASS32, v, c));
}
size_t
elf64_fsize(Elf_Type t, size_t c, unsigned int v)
{
return (_libelf_fsize(t, ELFCLASS64, v, c));
}
size_t
gelf_fsize(Elf *e, Elf_Type t, size_t c, unsigned int v)
{
if (e == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if (e->e_class == ELFCLASS32 || e->e_class == ELFCLASS64)
return (_libelf_fsize(t, e->e_class, v, c));
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 29, 2006
.Os
.Dt GELF_GETCAP 3
.Sh NAME
.Nm gelf_getcap ,
.Nm gelf_update_cap
.Nd read and update ELF capability information
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In gelf.h
.Ft "GElf_Cap *"
.Fn gelf_getcap "Elf_Data *data" "int ndx" "GElf_Cap *cap"
.Ft int
.Fn gelf_update_cap "Elf_Data *data" "int ndx" "GElf_Cap *cap"
.Sh DESCRIPTION
These convenience functions are used to retrieve and update class-dependent
.Vt Elf32_Cap
or
.Vt Elf64_Cap
information.
.Pp
Argument
.Ar data
is an
.Vt Elf_Data
descriptor associated with a section of type
.Dv SHT_SUNW_cap .
Argument
.Ar ndx
is the index of the entry being retrieved or updated.
The class-independent
.Vt GElf_Cap
structure is described in
.Xr gelf 3 .
.Pp
Function
.Fn gelf_getcap
retrieves the class-dependent entry at index
.Ar ndx
in data buffer
.Ar data
and copies it to the destination pointed to by argument
.Ar cap
after translation to class-independent form.
.Pp
Function
.Fn gelf_update_cap
converts the class-independent entry pointed to
by argument
.Ar cap
to class-dependent form, and writes it to the entry at index
.Ar ndx
in the data buffer described by argument
.Ar data .
Function
.Fn gelf_update_cap
signals an error if any of the values in the class-independent
representation exceeds the representable limits of the target
type.
.Sh RETURN VALUES
Function
.Fn gelf_getcap
returns the value of argument
.Ar cap
if successful, or NULL in case of an error.
Function
.Fn gelf_update_cap
returns a non-zero value if successful, or zero in case of an error.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Arguments
.Ar data
or
.Ar cap
were NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar ndx
was less than zero or larger than the number of entries in the data
descriptor.
.It Bq Er ELF_E_ARGUMENT
Data descriptor
.Ar data
was not associated with a section of type
.Dv SHT_SUNW_cap .
.It Bq Er ELF_E_RANGE
A value was not representable in the target type.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_getdata 3 ,
.Xr elf_getscn 3 ,
.Xr gelf 3

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd July 3, 2006
.Os
.Dt GELF_GETCLASS 3
.Sh NAME
.Nm gelf_getclass
.Nd retrieve the class of an ELF descriptor
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In gelf.h
.Ft int
.Fn gelf_getclass "Elf *elf"
.Sh DESCRIPTION
Function
.Fn gelf_getclass
returns the ELF class of the descriptor supplied in argument
.Ar elf .
.Sh RETURN VALUES
Function
.Fn gelf_getclass
will return one of
.Dv ELFCLASS32
or
.Dv ELFCLASS64
if the argument
.Ar elf
is a descriptor for an ELF file.
The value
.Dv ELFCLASSNONE
is returned if argument
.Ar elf
was null, or if it was not a descriptor for an ELF file.
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_kind 3 ,
.Xr gelf 3

39
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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <gelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
int
gelf_getclass(Elf *e)
{
return (e != NULL ? e->e_class : ELFCLASSNONE);
}

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 29, 2006
.Os
.Dt GELF_GETDYN 3
.Sh NAME
.Nm gelf_getdyn ,
.Nm gelf_update_dyn
.Nd read and update ELF dynamic entries
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In gelf.h
.Ft "GElf_Dyn *"
.Fn gelf_getdyn "Elf_Data *data" "int ndx" "GElf_Dyn *dyn"
.Ft int
.Fn gelf_update_dyn "Elf_Data *data" "int ndx" "GElf_Dyn *dyn"
.Sh DESCRIPTION
These convenience functions are used to retrieve and update class-dependent
.Vt Elf32_Dyn
or
.Vt Elf64_Dyn
information in the
.Sy dynamic
table of an ELF object.
.Pp
Argument
.Ar data
is an
.Vt Elf_Data
descriptor associated with a section of type
.Dv SHT_DYNAMIC .
Argument
.Ar ndx
is the index of the entry being retrieved or updated.
The class-independent
.Vt GElf_Dyn
structure is described in
.Xr gelf 3 .
.Pp
Function
.Fn gelf_getdyn
retrieves the class-dependent entry at index
.Ar ndx
in data buffer
.Ar data
and copies it to the destination pointed to by argument
.Ar dyn
after translation to class-independent form.
.Pp
Function
.Fn gelf_update_dyn
converts the class-independent entry pointed to
by argument
.Ar dyn
to class-dependent form, and writes it to the entry at index
.Ar ndx
in the data buffer described by argument
.Ar data .
Function
.Fn gelf_update_dyn
signals an error if any of the values in the class-independent
representation exceeds the representable limits of the target
type.
.Sh RETURN VALUES
Function
.Fn gelf_getdyn
returns the value of argument
.Ar dyn
if successful, or NULL in case of an error.
Function
.Fn gelf_update_dyn
returns a non-zero value if successful, or zero in case of an error.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Arguments
.Ar data
or
.Ar dyn
were NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar ndx
was less than zero or larger than the number of entries in the data
descriptor.
.It Bq Er ELF_E_ARGUMENT
Data descriptor
.Ar data
was not associated with a section of type
.Dv SHT_DYNAMIC .
.It Bq Er ELF_E_RANGE
A value was not representable in the target type.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_getdata 3 ,
.Xr elf_getscn 3 ,
.Xr gelf 3

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd December 16, 2006
.Os
.Dt GELF_GETEHDR 3
.Sh NAME
.Nm elf32_getehdr ,
.Nm elf64_getehdr ,
.Nm gelf_getehdr
.Nd retrieve the object file header
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft "Elf32_Ehdr *"
.Fn elf32_getehdr "Elf *elf"
.Ft "Elf64_Ehdr *"
.Fn elf64_getehdr "Elf *elf"
.In gelf.h
.Ft "GElf_Ehdr *"
.Fn gelf_getehdr "Elf *elf" "GElf_Ehdr *dst"
.Sh DESCRIPTION
These functions retrieve the ELF object file
header from the ELF descriptor
.Ar elf
and return a translated header descriptor to their callers.
.Pp
Functions
.Fn elf32_getehdr
and
.Fn elf64_getehdr
return a pointer to the appropriate class-specific header descriptor
if it exists in the file referenced by descriptor
.Ar elf .
These functions return
.Dv NULL
if an ELF header was not found in file
.Ar elf .
.Pp
Function
.Fn gelf_getehdr
stores a translated copy of the header for ELF file
.Ar elf
into the descriptor pointed to by argument
.Ar dst .
It returns argument
.Ar dst
if successful or
.Dv NULL
in case of failure.
.Sh RETURN VALUES
These functions return a pointer to a translated header descriptor
if successful, or NULL on failure.
.Sh ERRORS
These functions can fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
The argument
.Ar elf
was null.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not a descriptor for an ELF file.
.It Bq Er ELF_E_ARGUMENT
The elf class of descriptor
.Ar elf
was not recognized.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar dst
was null.
.It Bq Er ELF_E_CLASS
The ELF class of descriptor
.Ar elf
did not match that of the API function being called.
.It Bq Er ELF_E_HEADER
ELF descriptor
.Ar elf
does not have an associated header.
.It Bq Er ELF_E_RESOURCE
An out of memory condition was detected during execution.
.It Bq Er ELF_E_SECTION
The ELF descriptor in argument
.Ar elf
did not adhere to the conventions used for extended numbering.
.It Bq Er ELF_E_VERSION
The ELF descriptor
.Ar elf
had an unsupported ELF version number.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf32_newehdr 3 ,
.Xr elf64_newehdr 3 ,
.Xr elf_flagehdr 3 ,
.Xr elf_getident 3 ,
.Xr gelf 3 ,
.Xr gelf_newehdr 3 ,
.Xr elf 5

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 29, 2006
.Os
.Dt GELF_GETMOVE 3
.Sh NAME
.Nm gelf_getmove ,
.Nm gelf_update_move
.Nd read and update Elf Move information
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In gelf.h
.Ft "GElf_Move *"
.Fn gelf_getmove "Elf_Data *data" "int ndx" "GElf_Move *move"
.Ft int
.Fn gelf_update_move "Elf_Data *data" "int ndx" "GElf_Move *move"
.Sh DESCRIPTION
These convenience functions are used to retrieve and update class-dependent
.Vt Elf32_Move
and
.Vt Elf64_Move
structures in an ELF object.
.Pp
Argument
.Ar data
is an
.Vt Elf_Data
descriptor associated with a section of type
.Dv SHT_SUNW_move .
Argument
.Ar ndx
is the index of the move record being retrieved or updated.
The class-independent
.Vt GElf_Move
structure is described in
.Xr gelf 3 .
.Pp
Function
.Fn gelf_getmove
retrieves class-dependent move record at index
.Ar ndx
in data buffer
.Ar data
and copies it to the destination pointed to by argument
.Ar move
after translation to class-independent form.
.Pp
Function
.Fn gelf_update_move
converts the class-independent move information pointed to
by argument
.Ar move
to class-dependent form, and writes it to the move record at index
.Ar ndx
in the data buffer described by argument
.Ar data .
Function
.Fn gelf_update_move
signals an error if any of the values in the class-independent
representation exceeds the representable limits of the target
type.
.Sh RETURN VALUES
Function
.Fn gelf_getmove
returns the value of argument
.Ar move
if successful, or NULL in case of an error.
Function
.Fn gelf_update_move
returns a non-zero value if successful, or zero in case of an error.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Arguments
.Ar data
or
.Ar move
were NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar ndx
was less than zero or larger than the number of records in the data
descriptor.
.It Bq Er ELF_E_ARGUMENT
Data descriptor
.Ar data
was not associated with a section containing move information.
.It Bq Er ELF_E_RANGE
A value was not representable in the target type.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_getdata 3 ,
.Xr elf_getscn 3 ,
.Xr gelf 3

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.\" Copyright (c) 2006-2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd October 21, 2007
.Os
.Dt GELF_GETPHDR 3
.Sh NAME
.Nm elf32_getphdr ,
.Nm elf64_getphdr ,
.Nm gelf_getphdr
.Nd retrieve an ELF program header table
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft "Elf32_Phdr *"
.Fn elf32_getphdr "Elf *elf"
.Ft "Elf64_Phdr *"
.Fn elf64_getphdr "Elf *elf"
.In gelf.h
.Ft "GElf_Phdr *"
.Fn gelf_getphdr "Elf *elf" "int index" "GElf_Phdr *dst"
.Sh DESCRIPTION
These functions retrieve and translate ELF program header information
from an ELF descriptor, if this information exists.
.Pp
Functions
.Fn elf32_getphdr
and
.Fn elf64_getphdr
return a pointer to an array of translated
.Vt Elf32_Phdr
and
.Vt Elf64_Phdr
descriptors respectively.
These descriptors are described in
.Xr elf 5 .
The number of entries in this array may be determined using the
.Xr elf_getphnum 3
function.
.Pp
Function
.Fn gelf_getphdr
will retrieve the program header table entry at index
.Ar index
from ELF descriptor
.Ar elf.
The translated program header table entry will be written to the
address pointed to be argument
.Ar dst .
.Pp
Applications may inform the library of modifications to a program header table entry
by using the
.Xr elf_flagphdr 3
API.
Applications using the
.Xr gelf 3
interface need to use the
.Xr gelf_update_phdr 3
API to copy modifications to a program header entry back to the underlying
ELF descriptor.
.Sh RETURN VALUES
The functions a valid pointer if successful, or NULL in case an error
was encountered.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not a descriptor for an ELF object.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar dst
was NULL.
.It Bq Er ELF_E_ARGUMENT
Index
.Ar index
was out of range.
.It Bq Er ELF_E_CLASS
The class of ELF descriptor
.Ar elf
did not match the expected class of the function being called.
.It Bq Er ELF_E_HEADER
ELF descriptor
.Ar elf
did not possess an executable header.
.It Bq Er ELF_E_HEADER
ELF descriptor
.Ar elf
had a corrupt executable header.
.It Bq Er ELF_E_RESOURCE
An out of memory condition was detected.
.It Bq Er ELF_E_SECTION
The ELF descriptor in argument
.Ar elf
did not adhere to the conventions used for extended numbering.
.It Bq Er ELF_VERSION
ELF descriptor
.Ar elf
was of an unsupported version.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf32_getehdr 3 ,
.Xr elf32_newphdr 3 ,
.Xr elf64_getehdr 3 ,
.Xr elf64_newphdr 3 ,
.Xr elf_flagphdr 3 ,
.Xr elf_getphnum 3 ,
.Xr gelf 3 ,
.Xr gelf_getehdr 3 ,
.Xr gelf_newphdr 3 ,
.Xr gelf_update_phdr 3 ,
.Xr elf 5

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 29, 2006
.Os
.Dt GELF_GETREL 3
.Sh NAME
.Nm gelf_getrel ,
.Nm gelf_update_rel
.Nd read and update ELF relocation entries
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In gelf.h
.Ft "GElf_Rel *"
.Fn gelf_getrel "Elf_Data *data" "int ndx" "GElf_Rel *rel"
.Ft int
.Fn gelf_update_rel "Elf_Data *data" "int ndx" "GElf_Rel *rel"
.Sh DESCRIPTION
These convenience functions are used to retrieve and update class-dependent
.Vt Elf32_Rel
or
.Vt Elf64_Rel
structures in an ELF object.
.Pp
Argument
.Ar data
is an
.Vt Elf_Data
descriptor associated with a section of type
.Dv SHT_REL .
Argument
.Ar ndx
is the index of the entry being retrieved or updated.
The class-independent
.Vt GElf_Rel
structure is described in
.Xr gelf 3 .
.Pp
Function
.Fn gelf_getrel
retrieves the class-dependent entry at index
.Ar ndx
in data buffer
.Ar data
and copies it to the destination pointed to by argument
.Ar rel
after translation to class-independent form.
.Pp
Function
.Fn gelf_update_rel
converts the class-independent entry pointed to
by argument
.Ar rel
to class-dependent form, and writes it to the entry at index
.Ar ndx
in the data buffer described by argument
.Ar data .
Function
.Fn gelf_update_rel
signals an error if any of the values in the class-independent
representation exceeds the representable limits of the target
type.
.Sh RETURN VALUES
Function
.Fn gelf_getrel
returns the value of argument
.Ar rel
if successful, or NULL in case of an error.
Function
.Fn gelf_update_rel
returns a non-zero value if successful, or zero in case of an error.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Arguments
.Ar data
or
.Ar rel
were NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar ndx
was less than zero or larger than the number of entries in the data
descriptor.
.It Bq Er ELF_E_ARGUMENT
Data descriptor
.Ar data
was not associated with a section of type
.Dv SHT_REL .
.It Bq Er ELF_E_RANGE
A value was not representable in the target type.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_getdata 3 ,
.Xr elf_getscn 3 ,
.Xr gelf 3

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 29, 2006
.Os
.Dt GELF_GETRELA 3
.Sh NAME
.Nm gelf_getrela ,
.Nm gelf_update_rela
.Nd read and update ELF relocation entries with addends
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In gelf.h
.Ft "GElf_Rela *"
.Fn gelf_getrela "Elf_Data *data" "int ndx" "GElf_Rela *rela"
.Ft int
.Fn gelf_update_rela "Elf_Data *data" "int ndx" "GElf_Rela *rela"
.Sh DESCRIPTION
These convenience functions are used to retrieve and update class-dependent
.Vt Elf32_Rela
or
.Vt Elf64_Rela
structures in an ELF object.
.Pp
Argument
.Ar data
is an
.Vt Elf_Data
descriptor associated with a section of type
.Dv SHT_RELA .
Argument
.Ar ndx
is the index of the entry being retrieved or updated.
The class-independent
.Vt GElf_Rela
structure is described in
.Xr gelf 3 .
.Pp
Function
.Fn gelf_getrela
retrieves the class-dependent entry at index
.Ar ndx
in data buffer
.Ar data
and copies it to the destination pointed to by argument
.Ar rela
after translation to class-independent form.
.Pp
Function
.Fn gelf_update_rela
converts the class-independent entry pointed to
by argument
.Ar rela
to class-dependent form, and writes it to the entry at index
.Ar ndx
in the data buffer described by argument
.Ar data .
Function
.Fn gelf_update_rela
signals an error if any of the values in the class-independent
representation exceeds the representable limits of the target
type.
.Sh RETURN VALUES
Function
.Fn gelf_getrela
returns the value of argument
.Ar rela
if successful, or NULL in case of an error.
Function
.Fn gelf_update_rela
returns a non-zero value if successful, or zero in case of an error.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Arguments
.Ar data
or
.Ar rela
were NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar ndx
was less than zero or larger than the number of entries in the data
descriptor.
.It Bq Er ELF_E_ARGUMENT
Data descriptor
.Ar data
was not associated with a section of type
.Dv SHT_RELA .
.It Bq Er ELF_E_RANGE
A value was not representable in the target type.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_getdata 3 ,
.Xr elf_getscn 3 ,
.Xr gelf 3

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 27, 2006
.Os
.Dt GELF_GETSHDR 3
.Sh NAME
.Nm elf32_getshdr ,
.Nm elf64_getshdr ,
.Nm gelf_getshdr
.Nd retrieve the class-dependent section header
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft "Elf32_Shdr *"
.Fn elf32_getshdr "Elf_Scn *scn"
.Ft "Elf64_Shdr *"
.Fn elf64_getshdr "Elf_Scn *scn"
.In gelf.h
.Ft "GElf_Shdr *"
.Fn gelf_getshdr "Elf_Scn *scn" "GElf_Shdr *shdr"
.Sh DESCRIPTION
These functions return a pointer to the ELF Section Header data
structure associated with section descriptor
.Ar scn .
.Pp
Function
.Fn elf32_getshdr
retrieves a pointer to an
.Vt Elf32_Shdr
structure.
Section descriptor
.Ar scn
must be associated with an ELF descriptor of class
.Dv ELFCLASS32 .
.Pp
Function
.Fn elf64_getshdr
retrieves a pointer to an
.Vt Elf64_Shdr
structure.
Section descriptor
.Ar scn
must be associated with an ELF descriptor of class
.Dv ELFCLASS64 .
.Pp
Function
.Fn gelf_getshdr
copies the values in the section header associated with argument
.Ar scn
to the structure pointed to be argument
.Ar dst .
The
.Vt GElf_Shdr
data structure is described in
.Xr gelf 3 .
.Sh RETURN VALUES
Functions
.Fn elf32_getshdr
and
.Fn elf64_getshdr
return a valid pointer to the appropriate section header on success
or NULL if an error was encountered.
.Pp
Function
.Fn gelf_getshdr
returns argument
.Ar dst
if successful, or NULL if an error was encountered.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Arguments
.Ar scn
or
.Ar shdr
were NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar scn
was not associated a descriptor for an ELF object.
.It Bq Er ELF_E_CLASS
The ELF class associated with the section descriptor
.Ar scn
did not match the class expected by the API.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_getscn 3 ,
.Xr gelf 3 ,
.Xr gelf_update_shdr 3

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 29, 2006
.Os
.Dt GELF_GETSYM 3
.Sh NAME
.Nm gelf_getsym ,
.Nm gelf_update_sym
.Nd read and update symbol information
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In gelf.h
.Ft "GElf_Sym *"
.Fn gelf_getsym "Elf_Data *data" "int ndx" "GElf_Sym *sym"
.Ft int
.Fn gelf_update_sym "Elf_Data *data" "int ndx" "GElf_Sym *sym"
.Sh DESCRIPTION
These convenience functions are used to retrieve and update class-dependent
.Vt Elf32_Sym
and
.Vt Elf64_Sym
structures in an ELF object.
.Pp
Argument
.Ar data
is an
.Vt Elf_Data
descriptor associated with a section of type
.Dv SHT_SYMTAB ,
.Dv SHT_DYNSYM
or
.Dv SHT_GNU_versym .
Argument
.Ar ndx
is the index of the symbol being retrieved or updated.
The class-independent
.Vt GElf_Sym
structure is described in
.Xr gelf 3 .
.Pp
Function
.Fn gelf_getsym
retrieves class-dependent symbol information at index
.Ar ndx
in data buffer
.Ar data
and copies it to the destination pointed to by argument
.Ar sym
after translation to class-independent form.
.Pp
Function
.Fn gelf_update_sym
converts the class-independent symbol information pointed to
by argument
.Ar sym
to class-dependent form, and writes it to the symbol entry at index
.Ar ndx
in the data buffer described by argument
.Ar data .
Function
.Fn gelf_update_sym
signals an error if any of the values in the class-independent
representation exceeds the representable limits of the target
type.
.Sh RETURN VALUES
Function
.Fn gelf_getsym
returns the value of argument
.Ar sym
if successful, or NULL in case of an error.
Function
.Fn gelf_update_sym
returns a non-zero value if successful, or zero in case of an error.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Arguments
.Ar data
or
.Ar sym
were NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar ndx
was less than zero or larger than the number of symbols in the data
descriptor.
.It Bq Er ELF_E_ARGUMENT
Data descriptor
.Ar data
was not associated with a section containing symbol information.
.It Bq Er ELF_E_RANGE
A value was not representable in the target type.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_getdata 3 ,
.Xr elf_getscn 3 ,
.Xr gelf 3 ,
.Xr gelf_getsyminfo 3 ,
.Xr gelf_update_syminfo 3

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 29, 2006
.Os
.Dt GELF_GETSYMINFO 3
.Sh NAME
.Nm gelf_getsyminfo ,
.Nm gelf_update_syminfo
.Nd read and update symbol information
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In gelf.h
.Ft "GElf_Syminfo *"
.Fn gelf_getsyminfo "Elf_Data *data" "int ndx" "GElf_Syminfo *syminfo"
.Ft int
.Fn gelf_update_syminfo "Elf_Data *data" "int ndx" "GElf_Syminfo *syminfo"
.Sh DESCRIPTION
These convenience functions are used to retrieve and update class-dependent
.Vt Elf32_Syminfo
and
.Vt Elf64_Syminfo
records in an ELF object.
.Pp
Argument
.Ar data
is an
.Vt Elf_Data
descriptor associated with a section of type
.Dv SHT_SUNW_syminfo .
Argument
.Ar ndx
is the index of the record being retrieved or updated.
The class-independent
.Vt GElf_Syminfo
structure is described in
.Xr gelf 3 .
.Pp
Function
.Fn gelf_getsyminfo
retrieves class-dependent record at index
.Ar ndx
in data buffer
.Ar data
and copies it to the destination pointed to by argument
.Ar syminfo
after translation to class-independent form.
.Pp
Function
.Fn gelf_update_syminfo
converts the class-independent record pointed to
by argument
.Ar syminfo
to class-dependent form, and writes it to the record at index
.Ar ndx
in the data buffer described by argument
.Ar data .
.Sh RETURN VALUES
Function
.Fn gelf_getsyminfo
returns the value of argument
.Ar syminfo
if successful, or NULL in case of an error.
Function
.Fn gelf_update_syminfo
returns a non-zero value if successful, or zero in case of an error.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Arguments
.Ar data
or
.Ar syminfo
were NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar ndx
was less than zero or larger than the number of symbols in the data
descriptor.
.It Bq Er ELF_E_ARGUMENT
Data descriptor
.Ar data
was not associated with a section containing symbol information.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_getdata 3 ,
.Xr elf_getscn 3 ,
.Xr gelf 3 ,
.Xr gelf_getsym 3 ,
.Xr gelf_update_sym 3

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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd November 5, 2006
.Os
.Dt GELF_GETSYMSHNDX 3
.Sh NAME
.Nm gelf_getsymshndx ,
.Nm gelf_update_symshndx
.Nd read and update symbol information using extended section indices
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In gelf.h
.Ft "GElf_Sym *"
.Fo gelf_getsymshndx
.Fa "Elf_Data *symdata"
.Fa "Elf_Data *xndxdata"
.Fa "int ndx"
.Fa "GElf_Sym *sym"
.Fa "Elf32_Word *xndxptr"
.Fc
.Ft int
.Fo gelf_update_symshndx
.Fa "Elf_Data *symdata"
.Fa "Elf_Data *xndxdata"
.Fa "int ndx"
.Fa "GElf_Sym *sym"
.Fa "Elf32_Word xndx"
.Fc
.Sh DESCRIPTION
These functions are analogous to
.Fn gelf_getsym
and
.Fn gelf_update_sym
respectively, but are capable of handling symbol tables using extended
section numbering.
.Pp
Argument
.Ar symdata
is an
.Vt Elf_Data
descriptor associated with a section of type
.Dv SHT_SYMTAB .
Argument
.Ar xndxdata
is an
.Vt Elf_Data
descriptor associated with a section of type
.Dv SHT_SYMTAB_SHNDX .
Argument
.Ar ndx
is the index of the symbol table entry being retrieved or updated.
Argument
.Ar sym
is a pointer to a class-independent
.Vt GElf_Sym
structure.
.Vt GElf_Sym
structures are described in detail in
.Xr gelf 3 .
.Pp
Function
.Fn gelf_getsymshndx
retrieves symbol information at index
.Ar ndx
from the data descriptor specified by argument
.Ar symdata
and stores in class-independent form in argument
.Ar sym .
In addition it retrieves the extended section index for the
symbol from data buffer
.Ar xndxdata
and stores it into the location pointed to by argument
.Ar xndxptr .
.Pp
Function
.Fn gelf_update_symshndx
updates the underlying symbol table entry in data
descriptor
.Ar symdata
with the information in argument
.Ar sym .
In addition it sets the extended section index in
data buffer
.Ar xndxdata
to the value of argument
.Ar xndx .
.Sh RETURN VALUES
Function
.Fn gelf_getsymshndx
returns the value of argument
.Ar sym
if successful, or NULL in case of an error.
.Pp
Function
.Fn gelf_update_symshndx
returns a non-zero value if successful, or zero in case of an error.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Arguments
.Ar symdata ,
.Ar xndxdata ,
.Ar xndxptr
or
.Ar sym
were NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar ndx
was less than zero, or too large for either of descriptors
.Ar symdata
or
.Ar xndxdata .
.It Bq Er ELF_E_ARGUMENT
Data descriptor
.Ar symdata
was not associated with a section of type
.Dv SHT_SYMTAB .
.It Bq Er ELF_E_ARGUMENT
Data descriptor
.Ar xndxdata
was not associated with a section of type
.Dv SHT_SYMTAB_SHNDX .
.It Bq Er ELF_E_ARGUMENT
Data descriptor
.Ar symdata
and
.Ar xndxdata
were associated with different ELF objects.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_getdata 3 ,
.Xr elf_getscn 3 ,
.Xr gelf 3 ,
.Xr gelf_getsym 3 ,
.Xr gelf_update_sym 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <assert.h>
#include <gelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
GElf_Move *
gelf_getmove(Elf_Data *d, int ndx, GElf_Move *dst)
{
int ec;
Elf *e;
Elf_Scn *scn;
Elf32_Move *move32;
Elf64_Move *move64;
size_t msz;
uint32_t sh_type;
if (d == NULL || ndx < 0 || dst == NULL ||
(scn = d->d_scn) == NULL ||
(e = scn->s_elf) == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32)
sh_type = scn->s_shdr.s_shdr32.sh_type;
else
sh_type = scn->s_shdr.s_shdr64.sh_type;
if (_libelf_xlate_shtype(sh_type) != ELF_T_MOVE) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
msz = _libelf_msize(ELF_T_MOVE, ec, e->e_version);
assert(msz > 0);
if (msz * ndx >= d->d_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if (ec == ELFCLASS32) {
move32 = (Elf32_Move *) d->d_buf + ndx;
dst->m_value = move32->m_value;
dst->m_info = (Elf64_Xword) move32->m_info;
dst->m_poffset = (Elf64_Xword) move32->m_poffset;
dst->m_repeat = move32->m_repeat;
dst->m_stride = move32->m_stride;
} else {
move64 = (Elf64_Move *) d->d_buf + ndx;
*dst = *move64;
}
return (dst);
}
int
gelf_update_move(Elf_Data *d, int ndx, GElf_Move *gm)
{
int ec;
Elf *e;
Elf_Scn *scn;
Elf32_Move *move32;
Elf64_Move *move64;
size_t msz;
uint32_t sh_type;
if (d == NULL || ndx < 0 || gm == NULL ||
(scn = d->d_scn) == NULL ||
(e = scn->s_elf) == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32)
sh_type = scn->s_shdr.s_shdr32.sh_type;
else
sh_type = scn->s_shdr.s_shdr64.sh_type;
if (_libelf_xlate_shtype(sh_type) != ELF_T_MOVE) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
msz = _libelf_msize(ELF_T_MOVE, ec, e->e_version);
assert(msz > 0);
if (msz * ndx >= d->d_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if (ec == ELFCLASS32) {
move32 = (Elf32_Move *) d->d_buf + ndx;
move32->m_value = gm->m_value;
LIBELF_COPY_U32(move32, gm, m_info);
LIBELF_COPY_U32(move32, gm, m_poffset);
move32->m_repeat = gm->m_repeat;
move32->m_stride = gm->m_stride;
} else {
move64 = (Elf64_Move *) d->d_buf + ndx;
*move64 = *gm;
}
return (1);
}

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.\" Copyright (c) 2006-2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd October 22, 2007
.Os
.Dt GELF_NEWEHDR 3
.Sh NAME
.Nm elf32_newehdr ,
.Nm elf64_newehdr ,
.Nm gelf_newehdr
.Nd retrieve or allocate the object file header
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft "Elf32_Ehdr *"
.Fn elf32_newehdr "Elf *elf"
.Ft "Elf64_Ehdr *"
.Fn elf64_newehdr "Elf *elf"
.In gelf.h
.Ft "void *"
.Fn gelf_newehdr "Elf *elf" "int elfclass"
.Sh DESCRIPTION
These functions retrieve the ELF header from the ELF descriptor
.Ar elf ,
allocating a new header if needed.
File data structures are translated to their in-memory representations
as described in
.Xr elf 3 .
.Pp
Function
.Fn elf32_newehdr
returns a pointer to a 32 bit
.Vt Elf32_Ehdr
structure.
Function
.Fn elf64_newehdr
returns a pointer to a 64 bit
.Vt Elf64_Ehdr structure.
.Pp
When argument
.Ar elfclass
has value
.Dv ELFCLASS32 ,
function
.Fn gelf_newehdr
returns the value returned by
.Fn elf32_newehdr "elf" .
When argument
.Ar elfclass
has value
.Dv ELFCLASS64
it returns the value returned by
.Fn elf64_newehdr "elf" .
.Pp
If a fresh header structure is allocated, the members of the
structure are initialized as follows:
.Bl -tag -width indent
.It Va "e_ident[EI_MAG0..EI_MAG3]"
Identification bytes at offsets
.Dv EI_MAG0 ,
.Dv EI_MAG1 ,
.Dv EI_MAG2
and
.Dv EI_MAG3
are set to the ELF signature.
.It Va "e_ident[EI_CLASS]"
The identification byte at offset
.Dv EI_CLASS
is set to the ELF class associated with the function being called
or to argument
.Ar elfclass
for function
.Fn gelf_newehdr .
.It Va "e_ident[EI_DATA]"
The identification byte at offset
.Dv EI_DATA
is set to
.Dv ELFDATANONE .
.It Va "e_ident[EI_VERSION]"
The identification byte at offset
.Dv EI_VERSION
is set to the ELF library's operating version set by a prior call to
.Xr elf_version 3 .
.It Va e_machine
is set to
.Dv EM_NONE .
.It Va e_type
is set to
.Dv ELF_K_NONE .
.It Va e_version
is set to the ELF library's operating version set by a prior call to
.Xr elf_version 3 .
.El
.Pp
Other members of the header are set to zero.
The application is responsible for changing these values
as needed before calling
.Fn elf_update .
.Pp
If successful, these three functions set the
.Dv ELF_F_DIRTY
flag on ELF descriptor
.Ar elf .
.Sh RETURN VALUES
These functions return a pointer to a translated header descriptor
if successful, or NULL on failure.
.Sh ERRORS
These functions can fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
The argument
.Ar elf
was null.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not a descriptor for an ELF object.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elfclass
had an unsupported value.
.It Bq Er ELF_E_ARGUMENT
The class of the ELF descriptor
.Ar elf
did not match that of the requested operation.
.It Bq Er ELF_E_ARGUMENT
For function
.Fn gelf_newehdr ,
the class of argument
.Ar elf
was not
.Dv ELFCLASSNONE
and did not match the argument
.Ar elfclass .
.It Bq Er ELF_E_CLASS
The ELF class of descriptor
.Ar elf
did not match that of the API function being called.
.It Bq Er ELF_E_HEADER
A malformed ELF header was detected.
.It Bq Er ELF_E_RESOURCE
An out of memory condition was detected during execution.
.It Bq Er ELF_E_SECTION
The ELF descriptor in argument
.Ar elf
did not adhere to the conventions used for extended numbering.
.It Bq Er ELF_E_VERSION
The ELF descriptor
.Ar elf
had an unsupported ELF version number.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf32_getehdr 3 ,
.Xr elf64_getehdr 3 ,
.Xr elf_flagdata 3 ,
.Xr elf_getident 3 ,
.Xr elf_update 3 ,
.Xr elf_version 3 ,
.Xr gelf 3 ,
.Xr gelf_getehdr 3 ,
.Xr elf 5

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.\" Copyright (c) 2006-2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd October 22, 2007
.Os
.Dt GELF_NEWPHDR 3
.Sh NAME
.Nm elf32_newphdr ,
.Nm elf64_newphdr ,
.Nm gelf_newphdr
.Nd allocate an ELF program header table
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft "Elf32_Phdr *"
.Fn elf32_newphdr "Elf *elf" "size_t count"
.Ft "Elf64_Phdr *"
.Fn elf64_newphdr "Elf *elf" "size_t count"
.In gelf.h
.Ft "void *"
.Fn gelf_newphdr "Elf *elf" "size_t count"
.Sh DESCRIPTION
These functions allocate an ELF Program Header table
for an ELF descriptor.
.Vt Elf32_Phdr
and
.Vt Elf64_Phdr
descriptors are described further in
.Xr elf 5 .
.Pp
Functions
.Fn elf32_newphdr
and
.Fn elf64_newphdr
allocate a table of
.Ar count
.Vt Elf32_Phdr
and
.Vt Elf64_Phdr
descriptors respectively,
discarding any existing program header table
already present in the ELF descriptor
.Ar elf .
A value of zero for argument
.Ar count
may be used to delete an existing program header table
from an ELF descriptor.
.Pp
Function
.Fn gelf_newphdr
will return a table of
.Vt Elf32_Phdr
or
.Vt Elf64_Phdr
with
.Ar count
elements depending on the ELF class of ELF descriptor
.Ar elf .
.Pp
The functions set the
.Dv ELF_F_DIRTY
flag on the program header table.
All members of the returned array of Phdr structures
will be initialized to zero.
.Pp
After a successful call to these functions, the pointer returned
by a prior call to
.Fn elf32_getphdr
or
.Fn elf64_getphdr
on the same descriptor
.Ar elf
will no longer be valid.
.Sh RETURN VALUES
The functions a valid pointer if successful, or NULL in case an error
was encountered.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not a descriptor for an ELF object.
.It Bq Er ELF_E_CLASS
ELF descriptor
.Ar elf
was of an unrecognized class.
.It Bq Er ELF_E_RESOURCE
An out of memory condition was detected.
.It Bq Er ELF_E_SEQUENCE
An executable header was not allocated for ELF descriptor
.Ar elf
before using these APIs.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf32_getphdr 3 ,
.Xr elf32_newehdr 3 ,
.Xr elf64_getphdr 3 ,
.Xr elf64_newehdr 3 ,
.Xr elf_flagphdr 3 ,
.Xr elf_getphnum 3 ,
.Xr gelf 3 ,
.Xr gelf_getphdr 3 ,
.Xr gelf_newehdr 3 ,
.Xr elf 5

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <gelf.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
Elf32_Phdr *
elf32_getphdr(Elf *e)
{
return (_libelf_getphdr(e, ELFCLASS32));
}
Elf64_Phdr *
elf64_getphdr(Elf *e)
{
return (_libelf_getphdr(e, ELFCLASS64));
}
GElf_Phdr *
gelf_getphdr(Elf *e, int index, GElf_Phdr *d)
{
int ec;
Elf32_Ehdr *eh32;
Elf64_Ehdr *eh64;
Elf32_Phdr *ep32;
Elf64_Phdr *ep64;
if (d == NULL || e == NULL ||
((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) ||
(e->e_kind != ELF_K_ELF) || index < 0) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if (ec == ELFCLASS32) {
if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL ||
((ep32 = _libelf_getphdr(e, ELFCLASS32)) == NULL))
return (NULL);
if (index >= eh32->e_phnum) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
ep32 += index;
d->p_type = ep32->p_type;
d->p_offset = ep32->p_offset;
d->p_vaddr = (Elf64_Addr) ep32->p_vaddr;
d->p_paddr = (Elf64_Addr) ep32->p_paddr;
d->p_filesz = (Elf64_Xword) ep32->p_filesz;
d->p_memsz = (Elf64_Xword) ep32->p_memsz;
d->p_flags = ep32->p_flags;
d->p_align = (Elf64_Xword) ep32->p_align;
} else {
if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL ||
(ep64 = _libelf_getphdr(e, ELFCLASS64)) == NULL)
return (NULL);
if (index >= eh64->e_phnum) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
ep64 += index;
*d = *ep64;
}
return (d);
}
Elf32_Phdr *
elf32_newphdr(Elf *e, size_t count)
{
return (_libelf_newphdr(e, ELFCLASS32, count));
}
Elf64_Phdr *
elf64_newphdr(Elf *e, size_t count)
{
return (_libelf_newphdr(e, ELFCLASS64, count));
}
void *
gelf_newphdr(Elf *e, size_t count)
{
if (e == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
return (_libelf_newphdr(e, e->e_class, count));
}
int
gelf_update_phdr(Elf *e, int ndx, GElf_Phdr *s)
{
int ec, phnum;
void *ehdr;
Elf32_Phdr *ph32;
Elf64_Phdr *ph64;
if (s == NULL || e == NULL || e->e_kind != ELF_K_ELF ||
((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if (e->e_cmd == ELF_C_READ) {
LIBELF_SET_ERROR(MODE, 0);
return (0);
}
if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
return (0);
if (ec == ELFCLASS32)
phnum = ((Elf32_Ehdr *) ehdr)->e_phnum;
else
phnum = ((Elf64_Ehdr *) ehdr)->e_phnum;
if (ndx < 0 || ndx > phnum) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
(void) elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY);
if (ec == ELFCLASS64) {
ph64 = e->e_u.e_elf.e_phdr.e_phdr64 + ndx;
*ph64 = *s;
return (1);
}
ph32 = e->e_u.e_elf.e_phdr.e_phdr32 + ndx;
ph32->p_type = s->p_type;
ph32->p_flags = s->p_flags;
LIBELF_COPY_U32(ph32, s, p_offset);
LIBELF_COPY_U32(ph32, s, p_vaddr);
LIBELF_COPY_U32(ph32, s, p_paddr);
LIBELF_COPY_U32(ph32, s, p_filesz);
LIBELF_COPY_U32(ph32, s, p_memsz);
LIBELF_COPY_U32(ph32, s, p_align);
return (1);
}

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <assert.h>
#include <gelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
GElf_Rel *
gelf_getrel(Elf_Data *d, int ndx, GElf_Rel *dst)
{
int ec;
Elf *e;
Elf_Scn *scn;
Elf32_Rel *rel32;
Elf64_Rel *rel64;
size_t msz;
uint32_t sh_type;
if (d == NULL || ndx < 0 || dst == NULL ||
(scn = d->d_scn) == NULL ||
(e = scn->s_elf) == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32)
sh_type = scn->s_shdr.s_shdr32.sh_type;
else
sh_type = scn->s_shdr.s_shdr64.sh_type;
if (_libelf_xlate_shtype(sh_type) != ELF_T_REL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
msz = _libelf_msize(ELF_T_REL, ec, e->e_version);
assert(msz > 0);
if (msz * ndx >= d->d_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if (ec == ELFCLASS32) {
rel32 = (Elf32_Rel *) d->d_buf + ndx;
dst->r_offset = (Elf64_Addr) rel32->r_offset;
dst->r_info = ELF64_R_INFO(
(Elf64_Xword) ELF32_R_SYM(rel32->r_info),
ELF32_R_TYPE(rel32->r_info));
} else {
rel64 = (Elf64_Rel *) d->d_buf + ndx;
*dst = *rel64;
}
return (dst);
}
int
gelf_update_rel(Elf_Data *d, int ndx, GElf_Rel *dr)
{
int ec;
Elf *e;
Elf_Scn *scn;
Elf32_Rel *rel32;
Elf64_Rel *rel64;
size_t msz;
uint32_t sh_type;
if (d == NULL || ndx < 0 || dr == NULL ||
(scn = d->d_scn) == NULL ||
(e = scn->s_elf) == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32)
sh_type = scn->s_shdr.s_shdr32.sh_type;
else
sh_type = scn->s_shdr.s_shdr64.sh_type;
if (_libelf_xlate_shtype(sh_type) != ELF_T_REL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
msz = _libelf_msize(ELF_T_REL, ec, e->e_version);
assert(msz > 0);
if (msz * ndx >= d->d_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if (ec == ELFCLASS32) {
rel32 = (Elf32_Rel *) d->d_buf + ndx;
LIBELF_COPY_U32(rel32, dr, r_offset);
if (ELF64_R_SYM(dr->r_info) > ELF32_R_SYM(~0UL) ||
ELF64_R_TYPE(dr->r_info) > ELF32_R_TYPE(~0U)) {
LIBELF_SET_ERROR(RANGE, 0);
return (0);
}
rel32->r_info = ELF32_R_INFO(ELF64_R_SYM(dr->r_info),
ELF64_R_TYPE(dr->r_info));
} else {
rel64 = (Elf64_Rel *) d->d_buf + ndx;
*rel64 = *dr;
}
return (1);
}

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <assert.h>
#include <gelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
GElf_Rela *
gelf_getrela(Elf_Data *d, int ndx, GElf_Rela *dst)
{
int ec;
Elf *e;
Elf_Scn *scn;
Elf32_Rela *rela32;
Elf64_Rela *rela64;
size_t msz;
uint32_t sh_type;
if (d == NULL || ndx < 0 || dst == NULL ||
(scn = d->d_scn) == NULL ||
(e = scn->s_elf) == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32)
sh_type = scn->s_shdr.s_shdr32.sh_type;
else
sh_type = scn->s_shdr.s_shdr64.sh_type;
if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
msz = _libelf_msize(ELF_T_RELA, ec, e->e_version);
assert(msz > 0);
if (msz * ndx >= d->d_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if (ec == ELFCLASS32) {
rela32 = (Elf32_Rela *) d->d_buf + ndx;
dst->r_offset = (Elf64_Addr) rela32->r_offset;
dst->r_info = ELF64_R_INFO(
(Elf64_Xword) ELF32_R_SYM(rela32->r_info),
ELF32_R_TYPE(rela32->r_info));
dst->r_addend = (Elf64_Sxword) rela32->r_addend;
} else {
rela64 = (Elf64_Rela *) d->d_buf + ndx;
*dst = *rela64;
}
return (dst);
}
int
gelf_update_rela(Elf_Data *d, int ndx, GElf_Rela *dr)
{
int ec;
Elf *e;
Elf_Scn *scn;
Elf32_Rela *rela32;
Elf64_Rela *rela64;
size_t msz;
uint32_t sh_type;
if (d == NULL || ndx < 0 || dr == NULL ||
(scn = d->d_scn) == NULL ||
(e = scn->s_elf) == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32)
sh_type = scn->s_shdr.s_shdr32.sh_type;
else
sh_type = scn->s_shdr.s_shdr64.sh_type;
if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
msz = _libelf_msize(ELF_T_RELA, ec, e->e_version);
assert(msz > 0);
if (msz * ndx >= d->d_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if (ec == ELFCLASS32) {
rela32 = (Elf32_Rela *) d->d_buf + ndx;
LIBELF_COPY_U32(rela32, dr, r_offset);
if (ELF64_R_SYM(dr->r_info) > ELF32_R_SYM(~0UL) ||
ELF64_R_TYPE(dr->r_info) > ELF32_R_TYPE(~0U)) {
LIBELF_SET_ERROR(RANGE, 0);
return (0);
}
rela32->r_info = ELF32_R_INFO(ELF64_R_SYM(dr->r_info),
ELF64_R_TYPE(dr->r_info));
LIBELF_COPY_S32(rela32, dr, r_addend);
} else {
rela64 = (Elf64_Rela *) d->d_buf + ndx;
*rela64 = *dr;
}
return (1);
}

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <assert.h>
#include <gelf.h>
#include <libelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
Elf32_Shdr *
elf32_getshdr(Elf_Scn *s)
{
return (_libelf_getshdr(s, ELFCLASS32));
}
Elf64_Shdr *
elf64_getshdr(Elf_Scn *s)
{
return (_libelf_getshdr(s, ELFCLASS64));
}
GElf_Shdr *
gelf_getshdr(Elf_Scn *s, GElf_Shdr *d)
{
int ec;
void *sh;
Elf32_Shdr *sh32;
Elf64_Shdr *sh64;
if (d == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if ((sh = _libelf_getshdr(s, ELFCLASSNONE)) == NULL)
return (NULL);
ec = s->s_elf->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32) {
sh32 = (Elf32_Shdr *) sh;
d->sh_name = sh32->sh_name;
d->sh_type = sh32->sh_type;
d->sh_flags = (Elf64_Xword) sh32->sh_flags;
d->sh_addr = (Elf64_Addr) sh32->sh_addr;
d->sh_offset = (Elf64_Off) sh32->sh_offset;
d->sh_size = (Elf64_Xword) sh32->sh_size;
d->sh_link = sh32->sh_link;
d->sh_info = sh32->sh_info;
d->sh_addralign = (Elf64_Xword) sh32->sh_addralign;
d->sh_entsize = (Elf64_Xword) sh32->sh_entsize;
} else {
sh64 = (Elf64_Shdr *) sh;
*d = *sh64;
}
return (d);
}
int
gelf_update_shdr(Elf_Scn *scn, GElf_Shdr *s)
{
int ec;
Elf *e;
Elf32_Shdr *sh32;
if (s == NULL || scn == NULL || (e = scn->s_elf) == NULL ||
e->e_kind != ELF_K_ELF ||
((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if (e->e_cmd == ELF_C_READ) {
LIBELF_SET_ERROR(MODE, 0);
return (0);
}
(void) elf_flagscn(scn, ELF_C_SET, ELF_F_DIRTY);
if (ec == ELFCLASS64) {
scn->s_shdr.s_shdr64 = *s;
return (1);
}
sh32 = &scn->s_shdr.s_shdr32;
sh32->sh_name = s->sh_name;
sh32->sh_type = s->sh_type;
LIBELF_COPY_U32(sh32, s, sh_flags);
LIBELF_COPY_U32(sh32, s, sh_addr);
LIBELF_COPY_U32(sh32, s, sh_offset);
LIBELF_COPY_U32(sh32, s, sh_size);
sh32->sh_link = s->sh_link;
sh32->sh_info = s->sh_info;
LIBELF_COPY_U32(sh32, s, sh_addralign);
LIBELF_COPY_U32(sh32, s, sh_entsize);
return (1);
}

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <assert.h>
#include <gelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
GElf_Sym *
gelf_getsym(Elf_Data *d, int ndx, GElf_Sym *dst)
{
int ec;
Elf *e;
Elf_Scn *scn;
Elf32_Sym *sym32;
Elf64_Sym *sym64;
size_t msz;
uint32_t sh_type;
if (d == NULL || ndx < 0 || dst == NULL ||
(scn = d->d_scn) == NULL ||
(e = scn->s_elf) == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32)
sh_type = scn->s_shdr.s_shdr32.sh_type;
else
sh_type = scn->s_shdr.s_shdr64.sh_type;
if (_libelf_xlate_shtype(sh_type) != ELF_T_SYM) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
msz = _libelf_msize(ELF_T_SYM, ec, e->e_version);
assert(msz > 0);
if (msz * ndx >= d->d_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if (ec == ELFCLASS32) {
sym32 = (Elf32_Sym *) d->d_buf + ndx;
dst->st_name = sym32->st_name;
dst->st_value = (Elf64_Addr) sym32->st_value;
dst->st_size = (Elf64_Xword) sym32->st_size;
dst->st_info = ELF64_ST_INFO(ELF32_ST_BIND(sym32->st_info),
ELF32_ST_TYPE(sym32->st_info));
dst->st_other = sym32->st_other;
dst->st_shndx = sym32->st_shndx;
} else {
sym64 = (Elf64_Sym *) d->d_buf + ndx;
*dst = *sym64;
}
return (dst);
}
int
gelf_update_sym(Elf_Data *d, int ndx, GElf_Sym *gs)
{
int ec;
Elf *e;
Elf_Scn *scn;
Elf32_Sym *sym32;
Elf64_Sym *sym64;
size_t msz;
uint32_t sh_type;
if (d == NULL || ndx < 0 || gs == NULL ||
(scn = d->d_scn) == NULL ||
(e = scn->s_elf) == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32)
sh_type = scn->s_shdr.s_shdr32.sh_type;
else
sh_type = scn->s_shdr.s_shdr64.sh_type;
if (_libelf_xlate_shtype(sh_type) != ELF_T_SYM) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
msz = _libelf_msize(ELF_T_SYM, ec, e->e_version);
assert(msz > 0);
if (msz * ndx >= d->d_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if (ec == ELFCLASS32) {
sym32 = (Elf32_Sym *) d->d_buf + ndx;
sym32->st_name = gs->st_name;
sym32->st_info = gs->st_info;
sym32->st_other = gs->st_other;
sym32->st_shndx = gs->st_shndx;
LIBELF_COPY_U32(sym32, gs, st_value);
LIBELF_COPY_U32(sym32, gs, st_size);
} else {
sym64 = (Elf64_Sym *) d->d_buf + ndx;
*sym64 = *gs;
}
return (1);
}

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <assert.h>
#include <gelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
GElf_Syminfo *
gelf_getsyminfo(Elf_Data *d, int ndx, GElf_Syminfo *dst)
{
int ec;
Elf *e;
Elf_Scn *scn;
Elf32_Syminfo *syminfo32;
Elf64_Syminfo *syminfo64;
size_t msz;
uint32_t sh_type;
if (d == NULL || ndx < 0 || dst == NULL ||
(scn = d->d_scn) == NULL ||
(e = scn->s_elf) == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32)
sh_type = scn->s_shdr.s_shdr32.sh_type;
else
sh_type = scn->s_shdr.s_shdr64.sh_type;
if (_libelf_xlate_shtype(sh_type) != ELF_T_SYMINFO) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
msz = _libelf_msize(ELF_T_SYMINFO, ec, e->e_version);
assert(msz > 0);
if (msz * ndx >= d->d_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
if (ec == ELFCLASS32) {
syminfo32 = (Elf32_Syminfo *) d->d_buf + ndx;
dst->si_boundto = syminfo32->si_boundto;
dst->si_flags = syminfo32->si_flags;
} else {
syminfo64 = (Elf64_Syminfo *) d->d_buf + ndx;
*dst = *syminfo64;
}
return (dst);
}
int
gelf_update_syminfo(Elf_Data *d, int ndx, GElf_Syminfo *gs)
{
int ec;
Elf *e;
Elf_Scn *scn;
Elf32_Syminfo *syminfo32;
Elf64_Syminfo *syminfo64;
size_t msz;
uint32_t sh_type;
if (d == NULL || ndx < 0 || gs == NULL ||
(scn = d->d_scn) == NULL ||
(e = scn->s_elf) == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32)
sh_type = scn->s_shdr.s_shdr32.sh_type;
else
sh_type = scn->s_shdr.s_shdr64.sh_type;
if (_libelf_xlate_shtype(sh_type) != ELF_T_SYMINFO) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
msz = _libelf_msize(ELF_T_SYMINFO, ec, e->e_version);
assert(msz > 0);
if (msz * ndx >= d->d_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
if (ec == ELFCLASS32) {
syminfo32 = (Elf32_Syminfo *) d->d_buf + ndx;
syminfo32->si_boundto = gs->si_boundto;
syminfo32->si_flags = gs->si_flags;
} else {
syminfo64 = (Elf64_Syminfo *) d->d_buf + ndx;
*syminfo64 = *gs;
}
return (1);
}

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <assert.h>
#include <gelf.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
GElf_Sym *
gelf_getsymshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *dst,
Elf32_Word *shindex)
{
int ec;
Elf *e;
Elf_Scn *scn;
size_t msz;
uint32_t sh_type;
if (gelf_getsym(d, ndx, dst) == 0)
return (NULL);
if (id == NULL || (scn = id->d_scn) == NULL ||
(e = scn->s_elf) == NULL || (e != d->d_scn->s_elf) ||
shindex == NULL) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32)
sh_type = scn->s_shdr.s_shdr32.sh_type;
else
sh_type = scn->s_shdr.s_shdr64.sh_type;
if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
id->d_type != ELF_T_WORD) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
msz = _libelf_msize(ELF_T_WORD, ec, e->e_version);
assert(msz > 0);
if (msz * ndx >= id->d_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
*shindex = ((Elf32_Word *) id->d_buf)[ndx];
return (dst);
}
int
gelf_update_symshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *gs,
Elf32_Word xindex)
{
int ec;
Elf *e;
Elf_Scn *scn;
size_t msz;
uint32_t sh_type;
if (gelf_update_sym(d, ndx, gs) == 0)
return (0);
if (id == NULL || (scn = id->d_scn) == NULL ||
(e = scn->s_elf) == NULL || (e != d->d_scn->s_elf)) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
ec = e->e_class;
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
if (ec == ELFCLASS32)
sh_type = scn->s_shdr.s_shdr32.sh_type;
else
sh_type = scn->s_shdr.s_shdr64.sh_type;
if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
d->d_type != ELF_T_WORD) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
msz = _libelf_msize(ELF_T_WORD, ec, e->e_version);
assert(msz > 0);
if (msz * ndx >= id->d_size) {
LIBELF_SET_ERROR(ARGUMENT, 0);
return (0);
}
*(((Elf32_Word *) id->d_buf) + ndx) = xindex;
return (1);
}

123
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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd August 27, 2006
.Os
.Dt GELF_UPDATE_EHDR 3
.Sh NAME
.Nm gelf_update_ehdr ,
.Nm gelf_update_phdr ,
.Nm gelf_update_shdr
.Nd update underlying ELF data structures
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In gelf.h
.Ft int
.Fn gelf_update_ehdr "Elf *elf" "GElf_Ehdr *ehdr"
.Ft int
.Fn gelf_update_phdr "Elf *elf" "int ndx" "GElf_Phdr *phdr"
.Ft int
.Fn gelf_update_shdr "Elf_Scn *scn" "GElf_Shdr *shdr"
.Sh DESCRIPTION
These functions are used to update ELF data structures on the underlying
ELF descriptor.
Class-dependent data structures in the underlying ELF descriptor
are updated using the data in the class-independent GElf descriptors
and the underlying ELF data structures are marked
.Dq dirty .
The conversion process signals an error if the values being copied
to the target ELF data structure would exceed representation
limits.
GElf descriptors are described in
.Xr gelf 3 .
.Pp
Function
.Fn gelf_update_ehdr
updates the ELF Executable Header with the values in the
class-independent executable header
.Ar ehdr .
.Pp
Function
.Fn gelf_update_phdr
updates the ELF Program Header structure at index
.Ar ndx
with the values in the class-independent program header
.Ar phdr .
.Pp
Function
.Fn gelf_update_shdr
updates the ELF Section Header structure associated with section
descriptor
.Ar scn
with the values in argument
.Ar shdr .
.Sh RETURN VALUES
These functions return a non-zero integer on success, or zero in case
of an error.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Arguments
.Ar elf ,
.Ar ehdr ,
.Ar phdr ,
.Ar scn ,
or
.Ar shdr
were NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not a descriptor for an ELF object.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
had an unsupported ELF class.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar ndx
exceeded the number of entries in the program header table.
.It Bq Er ELF_E_ARGUMENT
Section descriptor
.Ar scn
was not associated with an ELF descriptor.
.It Bq Er ELF_E_MODE
ELF descriptor
.Ar elf
was not opened for writing or updating.
.It Bq Er ELF_E_RESOURCE
An out of memory condition was detected.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_flagelf 3 ,
.Xr elf_flagphdr 3 ,
.Xr elf_flagshdr 3 ,
.Xr gelf 3 ,
.Xr gelf_getehdr 3 ,
.Xr gelf_getphdr 3 ,
.Xr gelf_getshdr 3

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/*-
* Copyright (c) 2006,2008 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <gelf.h>
#include <libelf.h>
#include <string.h>
#include "_libelf.h"
LIBELF_VCSID("$Id$");
Elf_Data *
elf32_xlatetof(Elf_Data *dst, const Elf_Data *src, unsigned int encoding)
{
return _libelf_xlate(dst, src, encoding, ELFCLASS32, ELF_TOFILE);
}
Elf_Data *
elf64_xlatetof(Elf_Data *dst, const Elf_Data *src, unsigned int encoding)
{
return _libelf_xlate(dst, src, encoding, ELFCLASS64, ELF_TOFILE);
}
Elf_Data *
elf32_xlatetom(Elf_Data *dst, const Elf_Data *src, unsigned int encoding)
{
return _libelf_xlate(dst, src, encoding, ELFCLASS32, ELF_TOMEMORY);
}
Elf_Data *
elf64_xlatetom(Elf_Data *dst, const Elf_Data *src, unsigned int encoding)
{
return _libelf_xlate(dst, src, encoding, ELFCLASS64, ELF_TOMEMORY);
}
Elf_Data *
gelf_xlatetom(Elf *e, Elf_Data *dst, const Elf_Data *src, unsigned int encoding)
{
if (e != NULL)
return (_libelf_xlate(dst, src, encoding, e->e_class,
ELF_TOMEMORY));
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}
Elf_Data *
gelf_xlatetof(Elf *e, Elf_Data *dst, const Elf_Data *src, unsigned int encoding)
{
if (e != NULL)
return (_libelf_xlate(dst, src, encoding, e->e_class,
ELF_TOFILE));
LIBELF_SET_ERROR(ARGUMENT, 0);
return (NULL);
}

247
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.\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id$
.\"
.Dd July 24, 2006
.Os
.Dt GELF_XLATETOF 3
.Sh NAME
.Nm elf32_xlate ,
.Nm elf64_xlate ,
.Nm gelf_xlate
.Nd translate data between files and memory
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In libelf.h
.Ft "Elf_Data *"
.Fn elf32_xlatetof "Elf_Data *dst" "Elf_Data *src" "unsigned int encode"
.Ft "Elf_Data *"
.Fn elf32_xlatetom "Elf_Data *dst" "Elf_Data *src" "unsigned int encode"
.Ft "Elf_Data *"
.Fn elf64_xlatetof "Elf_Data *dst" "Elf_Data *src" "unsigned int encode"
.Ft "Elf_Data *"
.Fn elf64_xlatetom "Elf_Data *dst" "Elf_Data *src" "unsigned int encode"
.In gelf.h
.Ft "Elf_Data *"
.Fo gelf_xlatetof
.Fa "Elf *elf"
.Fa "Elf_Data *dst"
.Fa "Elf_Data *src"
.Fa "unsigned int encode"
.Fc
.Ft "Elf_Data *"
.Fo gelf_xlatetom
.Fa "Elf *elf"
.Fa "Elf_Data *dst"
.Fa "Elf_Data *src"
.Fa "unsigned int encode"
.Fc
.Sh DESCRIPTION
These functions translate between the file and memory representations
of ELF data structures.
The in-memory representation of an ELF data structure would confirm to
the byte ordering and data alignment restrictions dictated by the host
processor.
A file representation of the same data structure could use a non-native byte
ordering and in addition may be laid out differently with the file.
.Pp
Functions
.Fn elf32_xlatetom ,
.Fn elf64_xlatetom ,
and
.Fn gelf_xlatetom
translate data from file representations to native, in-memory representations.
Functions
.Fn elf32_xlatetof ,
.Fn elf64_xlatetof ,
and
.Fn gelf_xlatetof
translate data from in-memory representations to file representations.
.Pp
Argument
.Ar src
denotes an
.Vt Elf_Data
descriptor describing the source to be translated.
The following elements of the descriptor need to be set before
invoking these functions:
.Bl -hang -offset indent
.It Va d_buf
Set to a valid pointer value denoting the beginning of the data area
to be translated.
.It Va d_size
Set to the total size in bytes of the source data area to be
translated.
.It Va d_type
Set to the type of the source data being translated.
This value is one of the values defined in the
.Vt Elf_Type
enumeration.
The
.Vt Elf_Type
enumeration is described in
.Xr elf 3 .
.It Va d_version
Set to the version number of the ELF data structures being
translated.
Currently only version
.Dv EV_CURRENT
is supported.
.El
.Pp
Argument
.Ar dst
describes the destination buffer.
The following elements of the
.Vt Elf_Data
descriptor need to be set before invoking these functions:
.Bl -hang -offset indent
.It Va d_buf
Set to a valid pointer value that denotes the start of the destination
buffer that will hold translated data.
This value may be the same as that of the source buffer, in which case
an in-place conversion will be attempted.
.It Va d_size
Set to the size of the destination buffer in bytes.
This value will be modified if the function call succeeds.
.It Va d_version
Set to the desired version number of the destination.
Currently only version
.Dv EV_CURRENT
is supported.
.El
.Pp
These translations routines allow the source and destination buffers
to coincide, in which case an in-place translation will be done
if the destination is large enough to hold the translated data.
Other kinds of overlap between the source and destination buffers
are not permitted.
.Pp
On successful completion of the translation request the following
fields of the
.Ar dst
descriptor would be modified:
.Bl -hang -offset indent
.It Va d_size
Set to the size in bytes of the translated data.
.It Va d_type
Set to the
.Va d_type
value of the source data descriptor.
.El
.Pp
Argument
.Ar encode
specifies the encoding in which the file objects are represented.
It must be one of:
.Bl -hang -offset indent
.It Dv ELFDATANONE
File objects use the library's native byte ordering.
.It Dv ELFDATA2LSB
File objects use a little-endian ordering.
.It Dv ELFDATA2MSB
File objects use a big-endian ordering.
.El
.Pp
The functions
.Fn gelf_xlatetof
and
.Fn gelf_xlatetom
select the appropriate 32 or 64 bit translations based on the class of argument
.Ar elf .
.Sh RETURN VALUES
These functions return argument
.Ar dst
if successful, or NULL in case of an error.
.Sh EXAMPLES
TODO
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
One of arguments
.Ar src ,
.Ar dst
or
.Ar elf
was NULL.
.It Bq Er ELF_E_ARGUMENT
Arguments
.Ar src
and
.Ar dst
were equal.
.It Bq Er ELF_E_ARGUMENT
The desired encoding parameter was not one of
.Dv ELFDATANONE ,
.Dv ELFDATA2LSB
or
.Dv ELFDATA2MSB .
.It Bq Er ELF_E_ARGUMENT
The
.Ar d_type
field of argument
.Ar src
specified an unsupported type.
.It Bq Er ELF_E_DATA
The
.Ar src
argument specified a buffer size that was not an integral multiple of
its underlying type.
.It Bq Er ELF_E_DATA
The
.Ar dst
argument specified a buffer size that was too small.
.It Bq Er ELF_E_DATA
Argument
.Ar dst
specified a destination buffer that overlaps with the source
buffer.
.It Bq Er ELF_E_DATA
The destination buffer for a conversion to memory had an alignment
inappropriate for the underlying ELF type.
.It Bq Er ELF_E_DATA
The source buffer for a conversion to file had an alignment
inappropriate for the underlying ELF type.
.It Bq Er ELF_E_UNIMPL
The version numbers for arguments
.Ar dst
and
.Ar src
were not identical.
.It Bq Er ELF_E_UNIMPL
The argument
.Ar src
requested conversion for a type which is not currently
supported.
.It Bq Er ELF_E_VERSION
Argument
.Ar src
specified an unsupported version number.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_getdata 3 ,
.Xr gelf 3

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