/*-
* Copyright (c) 2006 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>
__FBSDID("$FreeBSD$");
#include <sys/limits.h>
#include <assert.h>
#include <gelf.h>
#include "_libelf.h"
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);
}
