f14fb60209
* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
357 lines
11 KiB
C
357 lines
11 KiB
C
/* $NetBSD: mdreloc.c,v 1.40 2011/03/25 18:07:07 joerg Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2001 Wasabi Systems, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* Written by Frank van der Linden for Wasabi Systems, Inc.
|
|
*
|
|
* 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 by
|
|
* Wasabi Systems, Inc.
|
|
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
|
|
* or promote products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* Copyright 1996 John D. Polstra.
|
|
* Copyright 1996 Matt Thomas <matt@3am-software.com>
|
|
* 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 by John Polstra.
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifndef lint
|
|
__RCSID("$NetBSD: mdreloc.c,v 1.40 2011/03/25 18:07:07 joerg Exp $");
|
|
#endif /* not lint */
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/mman.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <elf.h>
|
|
|
|
#include "debug.h"
|
|
#include "rtld.h"
|
|
|
|
void _rtld_bind_start(void);
|
|
void _rtld_relocate_nonplt_self(Elf_Dyn *, Elf_Addr);
|
|
caddr_t _rtld_bind(const Obj_Entry *, Elf_Word);
|
|
static inline int _rtld_relocate_plt_object(const Obj_Entry *,
|
|
const Elf_Rela *, Elf_Addr *);
|
|
|
|
void
|
|
_rtld_setup_pltgot(const Obj_Entry *obj)
|
|
{
|
|
obj->pltgot[1] = (Elf_Addr) obj;
|
|
obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start;
|
|
}
|
|
|
|
void
|
|
_rtld_relocate_nonplt_self(Elf_Dyn *dynp, Elf_Addr relocbase)
|
|
{
|
|
const Elf_Rela *rela = 0, *relalim;
|
|
Elf_Addr relasz = 0;
|
|
Elf_Addr *where;
|
|
|
|
for (; dynp->d_tag != DT_NULL; dynp++) {
|
|
switch (dynp->d_tag) {
|
|
case DT_RELA:
|
|
rela = (const Elf_Rela *)(relocbase + dynp->d_un.d_ptr);
|
|
break;
|
|
case DT_RELASZ:
|
|
relasz = dynp->d_un.d_val;
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* Assume only 64-bit relocations here, which should always
|
|
* be true for the dynamic linker.
|
|
*/
|
|
relalim = (const Elf_Rela *)((const uint8_t *)rela + relasz);
|
|
for (; rela < relalim; rela++) {
|
|
where = (Elf_Addr *)(relocbase + rela->r_offset);
|
|
*where = (Elf_Addr)(relocbase + rela->r_addend);
|
|
}
|
|
}
|
|
|
|
int
|
|
_rtld_relocate_nonplt_objects(Obj_Entry *obj)
|
|
{
|
|
const Elf_Rela *rela;
|
|
const Elf_Sym *def = NULL;
|
|
const Obj_Entry *defobj =NULL;
|
|
|
|
for (rela = obj->rela; rela < obj->relalim; rela++) {
|
|
Elf64_Addr *where64;
|
|
Elf32_Addr *where32;
|
|
Elf64_Addr tmp64;
|
|
Elf32_Addr tmp32;
|
|
unsigned long symnum;
|
|
|
|
where64 = (Elf64_Addr *)(obj->relocbase + rela->r_offset);
|
|
where32 = (Elf32_Addr *)where64;
|
|
symnum = ELF_R_SYM(rela->r_info);
|
|
|
|
switch (ELF_R_TYPE(rela->r_info)) {
|
|
case R_TYPE(NONE):
|
|
break;
|
|
|
|
case R_TYPE(32): /* word32 S + A, truncate */
|
|
case R_TYPE(32S): /* word32 S + A, signed truncate */
|
|
case R_TYPE(GOT32): /* word32 G + A (XXX can we see these?) */
|
|
def = _rtld_find_symdef(symnum, obj, &defobj, false);
|
|
if (def == NULL)
|
|
return -1;
|
|
tmp32 = (Elf32_Addr)(u_long)(defobj->relocbase +
|
|
def->st_value + rela->r_addend);
|
|
|
|
if (*where32 != tmp32)
|
|
*where32 = tmp32;
|
|
rdbg(("32/32S %s in %s --> %p in %s",
|
|
obj->strtab + obj->symtab[symnum].st_name,
|
|
obj->path, (void *)(uintptr_t)*where32,
|
|
defobj->path));
|
|
break;
|
|
case R_TYPE(64): /* word64 S + A */
|
|
def = _rtld_find_symdef(symnum, obj, &defobj, false);
|
|
if (def == NULL)
|
|
return -1;
|
|
tmp64 = (Elf64_Addr)(defobj->relocbase + def->st_value +
|
|
rela->r_addend);
|
|
|
|
if (*where64 != tmp64)
|
|
*where64 = tmp64;
|
|
rdbg(("64 %s in %s --> %p in %s",
|
|
obj->strtab + obj->symtab[symnum].st_name,
|
|
obj->path, (void *)*where64, defobj->path));
|
|
break;
|
|
case R_TYPE(PC32): /* word32 S + A - P */
|
|
def = _rtld_find_symdef(symnum, obj, &defobj, false);
|
|
if (def == NULL)
|
|
return -1;
|
|
tmp32 = (Elf32_Addr)(u_long)(defobj->relocbase +
|
|
def->st_value + rela->r_addend -
|
|
(Elf64_Addr)where64);
|
|
if (*where32 != tmp32)
|
|
*where32 = tmp32;
|
|
rdbg(("PC32 %s in %s --> %p in %s",
|
|
obj->strtab + obj->symtab[symnum].st_name,
|
|
obj->path, (void *)(unsigned long)*where32,
|
|
defobj->path));
|
|
break;
|
|
case R_TYPE(GLOB_DAT): /* word64 S */
|
|
def = _rtld_find_symdef(symnum, obj, &defobj, false);
|
|
if (def == NULL)
|
|
return -1;
|
|
tmp64 = (Elf64_Addr)(defobj->relocbase + def->st_value);
|
|
|
|
if (*where64 != tmp64)
|
|
*where64 = tmp64;
|
|
rdbg(("64 %s in %s --> %p in %s",
|
|
obj->strtab + obj->symtab[symnum].st_name,
|
|
obj->path, (void *)*where64, defobj->path));
|
|
break;
|
|
case R_TYPE(RELATIVE): /* word64 B + A */
|
|
tmp64 = (Elf64_Addr)(obj->relocbase + rela->r_addend);
|
|
if (*where64 != tmp64)
|
|
*where64 = tmp64;
|
|
rdbg(("RELATIVE in %s --> %p", obj->path,
|
|
(void *)*where64));
|
|
break;
|
|
|
|
case R_TYPE(TPOFF64):
|
|
def = _rtld_find_symdef(symnum, obj, &defobj, false);
|
|
if (def == NULL)
|
|
return -1;
|
|
|
|
if (!defobj->tls_done &&
|
|
_rtld_tls_offset_allocate(obj))
|
|
return -1;
|
|
|
|
*where64 = (Elf64_Addr)(def->st_value -
|
|
defobj->tlsoffset + rela->r_addend);
|
|
|
|
rdbg(("TPOFF64 %s in %s --> %p",
|
|
obj->strtab + obj->symtab[symnum].st_name,
|
|
obj->path, (void *)*where64));
|
|
|
|
break;
|
|
|
|
case R_TYPE(DTPMOD64):
|
|
def = _rtld_find_symdef(symnum, obj, &defobj, false);
|
|
if (def == NULL)
|
|
return -1;
|
|
|
|
*where64 = (Elf64_Addr)defobj->tlsindex;
|
|
|
|
rdbg(("DTPMOD64 %s in %s --> %p",
|
|
obj->strtab + obj->symtab[symnum].st_name,
|
|
obj->path, (void *)*where64));
|
|
|
|
break;
|
|
|
|
case R_TYPE(DTPOFF64):
|
|
def = _rtld_find_symdef(symnum, obj, &defobj, false);
|
|
if (def == NULL)
|
|
return -1;
|
|
|
|
*where64 = (Elf64_Addr)(def->st_value + rela->r_addend);
|
|
|
|
rdbg(("DTPOFF64 %s in %s --> %p",
|
|
obj->strtab + obj->symtab[symnum].st_name,
|
|
obj->path, (void *)*where64));
|
|
|
|
break;
|
|
|
|
case R_TYPE(COPY):
|
|
rdbg(("COPY"));
|
|
break;
|
|
|
|
default:
|
|
rdbg(("sym = %lu, type = %lu, offset = %p, "
|
|
"addend = %p, contents = %p, symbol = %s",
|
|
symnum, (u_long)ELF_R_TYPE(rela->r_info),
|
|
(void *)rela->r_offset, (void *)rela->r_addend,
|
|
(void *)*where64,
|
|
obj->strtab + obj->symtab[symnum].st_name));
|
|
_rtld_error("%s: Unsupported relocation type %ld "
|
|
"in non-PLT relocations",
|
|
obj->path, (u_long) ELF_R_TYPE(rela->r_info));
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
_rtld_relocate_plt_lazy(const Obj_Entry *obj)
|
|
{
|
|
const Elf_Rela *rela;
|
|
|
|
if (!obj->relocbase)
|
|
return 0;
|
|
|
|
for (rela = obj->pltrela; rela < obj->pltrelalim; rela++) {
|
|
Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
|
|
|
|
assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JUMP_SLOT));
|
|
|
|
/* Just relocate the GOT slots pointing into the PLT */
|
|
*where += (Elf_Addr)obj->relocbase;
|
|
rdbg(("fixup !main in %s --> %p", obj->path, (void *)*where));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
_rtld_relocate_plt_object(const Obj_Entry *obj, const Elf_Rela *rela, Elf_Addr *tp)
|
|
{
|
|
Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
|
|
Elf_Addr new_value;
|
|
const Elf_Sym *def;
|
|
const Obj_Entry *defobj;
|
|
unsigned long info = rela->r_info;
|
|
|
|
assert(ELF_R_TYPE(info) == R_TYPE(JUMP_SLOT));
|
|
|
|
def = _rtld_find_plt_symdef(ELF_R_SYM(info), obj, &defobj, tp != NULL);
|
|
if (__predict_false(def == NULL))
|
|
return -1;
|
|
if (__predict_false(def == &_rtld_sym_zero))
|
|
return 0;
|
|
|
|
new_value = (Elf_Addr)(defobj->relocbase + def->st_value +
|
|
rela->r_addend);
|
|
rdbg(("bind now/fixup in %s --> old=%p new=%p",
|
|
defobj->strtab + def->st_name, (void *)*where, (void *)new_value));
|
|
if (*where != new_value)
|
|
*where = new_value;
|
|
|
|
if (tp)
|
|
*tp = new_value - rela->r_addend;
|
|
|
|
return 0;
|
|
}
|
|
|
|
caddr_t
|
|
_rtld_bind(const Obj_Entry *obj, Elf_Word reloff)
|
|
{
|
|
const Elf_Rela *rela = obj->pltrela + reloff;
|
|
Elf_Addr new_value;
|
|
int error;
|
|
|
|
new_value = 0; /* XXX GCC4 */
|
|
|
|
_rtld_shared_enter();
|
|
error = _rtld_relocate_plt_object(obj, rela, &new_value);
|
|
if (error)
|
|
_rtld_die();
|
|
_rtld_shared_exit();
|
|
|
|
return (caddr_t)new_value;
|
|
}
|
|
|
|
int
|
|
_rtld_relocate_plt_objects(const Obj_Entry *obj)
|
|
{
|
|
const Elf_Rela *rela;
|
|
|
|
for (rela = obj->pltrela; rela < obj->pltrelalim; rela++)
|
|
if (_rtld_relocate_plt_object(obj, rela, NULL) < 0)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|