minix/lib/libc/gen/nlist_coff.c
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

199 lines
5 KiB
C

/* $NetBSD: nlist_coff.c,v 1.8 2009/08/21 08:42:02 he Exp $ */
/*
* Copyright (c) 1996 Christopher G. Demetriou
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the
* NetBSD Project. See http://www.NetBSD.org/ for
* information about NetBSD.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: nlist_coff.c,v 1.8 2009/08/21 08:42:02 he Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <nlist.h>
#include "nlist_private.h"
#ifdef NLIST_COFF
#include <sys/exec_coff.h>
#endif
#ifdef NLIST_COFF
#define BAD do { rv = -1; goto out; } while (/*CONSTCOND*/0)
#define BADUNMAP do { rv = -1; goto unmap; } while (/*CONSTCOND*/0)
#define ES_LEN 18
struct coff_extsym {
union {
char u_name[8];
struct {
int u_zero;
int u_offset;
} s;
} u;
int32_t es_value;
int16_t es_scnum;
int16_t es_type;
int8_t es_class;
int8_t es_numaux;
};
#define es_name u.u_name
#define es_zero u.s.u_zero
#define es_offset u.s.u_offset
int
__fdnlist_coff(fd, list)
int fd;
struct nlist *list;
{
struct nlist *p;
struct coff_filehdr *filehdrp;
struct stat st;
char *mappedfile;
size_t mappedsize;
u_long symoff, extstroff;
int rv, nent;
long i, nesyms;
_DIAGASSERT(fd != -1);
_DIAGASSERT(list != NULL);
rv = -1;
/*
* If we can't fstat() the file, something bad is going on.
*/
if (fstat(fd, &st) < 0)
BAD;
/*
* Map the file in its entirety.
*/
if ((uintmax_t)st.st_size > (uintmax_t)SIZE_T_MAX) {
errno = EFBIG;
BAD;
}
mappedsize = st.st_size;
mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_PRIVATE|MAP_FILE,
fd, 0);
if (mappedfile == (char *)-1)
BAD;
/*
* Make sure we can access the executable's header
* directly, and make sure we recognize the executable
* as an COFF binary.
*/
if (mappedsize < sizeof (struct coff_filehdr))
BADUNMAP;
filehdrp = (struct coff_filehdr *)&mappedfile[0];
if (COFF_BADMAG(filehdrp))
BADUNMAP;
/*
* Find the symbol list.
*/
symoff = filehdrp->f_symptr;
nesyms = filehdrp->f_nsyms;
if (symoff + ES_LEN * nesyms > mappedsize)
BADUNMAP;
extstroff = symoff + ES_LEN * nesyms;
nent = 0;
for (p = list; !ISLAST(p); ++p) {
p->n_type = 0;
p->n_other = 0;
p->n_desc = 0;
p->n_value = 0;
++nent;
}
for (i = 0; i < nesyms; i++) {
char *symtabname;
const char *nlistname;
struct coff_extsym esym;
char name[10];
memcpy(&esym, &mappedfile[symoff + ES_LEN * i], ES_LEN);
if (esym.es_numaux != 0) {
i += esym.es_numaux; /* XXX Skip aux entry */
continue;
}
if (esym.es_zero != 0) {
memcpy(name, esym.es_name, 8);
name[8] = 0;
symtabname = name;
} else if (esym.es_offset != 0)
symtabname = &mappedfile[extstroff + esym.es_offset];
else
continue;
for (p = list; !ISLAST(p); p++) {
nlistname = N_NAME(p);
if (!strcmp(symtabname, nlistname)) {
/*
* Translate (roughly) from COFF to nlist
*/
p->n_value = esym.es_value;
p->n_type = N_EXT; /* XXX */
p->n_desc = 0; /* XXX */
p->n_other = 0; /* XXX */
if (--nent <= 0)
goto done;
break; /* into next run of outer loop */
}
}
}
done:
rv = nent;
unmap:
munmap(mappedfile, mappedsize);
out:
return (rv);
}
#endif /* NLIST_COFF */