149 lines
3.9 KiB
C
149 lines
3.9 KiB
C
/*
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* gelfphdr.c - gelf_* translation functions.
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* Copyright (C) 2000 - 2006 Michael Riepe
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <private.h>
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#if __LIBELF64
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#ifndef lint
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static const char rcsid[] = "@(#) $Id: gelfphdr.c,v 1.9 2008/05/23 08:15:34 michael Exp $";
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#endif /* lint */
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#define check_and_copy(type, d, s, name, eret) \
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do { \
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if (sizeof((d)->name) < sizeof((s)->name) \
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&& (type)(s)->name != (s)->name) { \
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seterr(ERROR_BADVALUE); \
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return (eret); \
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} \
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(d)->name = (type)(s)->name; \
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} while (0)
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GElf_Phdr*
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gelf_getphdr(Elf *elf, int ndx, GElf_Phdr *dst) {
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GElf_Phdr buf;
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char *tmp;
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size_t n;
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if (!elf) {
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return NULL;
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}
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elf_assert(elf->e_magic == ELF_MAGIC);
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tmp = _elf_getphdr(elf, elf->e_class);
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if (!tmp) {
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return NULL;
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}
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if (ndx < 0 || ndx >= elf->e_phnum) {
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seterr(ERROR_BADINDEX);
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return NULL;
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}
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n = _msize(elf->e_class, _elf_version, ELF_T_PHDR);
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if (n == 0) {
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seterr(ERROR_UNIMPLEMENTED);
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return NULL;
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}
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if (!dst) {
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dst = &buf;
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}
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if (elf->e_class == ELFCLASS64) {
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*dst = *(Elf64_Phdr*)(tmp + ndx * n);
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}
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else if (elf->e_class == ELFCLASS32) {
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Elf32_Phdr *src = (Elf32_Phdr*)(tmp + ndx * n);
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check_and_copy(GElf_Word, dst, src, p_type, NULL);
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check_and_copy(GElf_Word, dst, src, p_flags, NULL);
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check_and_copy(GElf_Off, dst, src, p_offset, NULL);
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check_and_copy(GElf_Addr, dst, src, p_vaddr, NULL);
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check_and_copy(GElf_Addr, dst, src, p_paddr, NULL);
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check_and_copy(GElf_Xword, dst, src, p_filesz, NULL);
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check_and_copy(GElf_Xword, dst, src, p_memsz, NULL);
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check_and_copy(GElf_Xword, dst, src, p_align, NULL);
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}
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else {
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if (valid_class(elf->e_class)) {
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seterr(ERROR_UNIMPLEMENTED);
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}
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else {
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seterr(ERROR_UNKNOWN_CLASS);
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}
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return NULL;
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}
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if (dst == &buf) {
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dst = (GElf_Phdr*)malloc(sizeof(GElf_Phdr));
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if (!dst) {
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seterr(ERROR_MEM_PHDR);
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return NULL;
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}
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*dst = buf;
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}
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return dst;
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}
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int
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gelf_update_phdr(Elf *elf, int ndx, GElf_Phdr *src) {
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char *tmp;
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size_t n;
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if (!elf || !src) {
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return 0;
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}
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elf_assert(elf->e_magic == ELF_MAGIC);
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tmp = _elf_getphdr(elf, elf->e_class);
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if (!tmp) {
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return 0;
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}
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if (ndx < 0 || ndx >= elf->e_phnum) {
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seterr(ERROR_BADINDEX);
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return 0;
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}
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n = _msize(elf->e_class, _elf_version, ELF_T_PHDR);
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if (n == 0) {
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seterr(ERROR_UNIMPLEMENTED);
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return 0;
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}
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if (elf->e_class == ELFCLASS64) {
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*(Elf64_Phdr*)(tmp + ndx * n) = *src;
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}
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else if (elf->e_class == ELFCLASS32) {
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Elf32_Phdr *dst = (Elf32_Phdr*)(tmp + ndx * n);
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check_and_copy(Elf32_Word, dst, src, p_type, 0);
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check_and_copy(Elf32_Off, dst, src, p_offset, 0);
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check_and_copy(Elf32_Addr, dst, src, p_vaddr, 0);
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check_and_copy(Elf32_Addr, dst, src, p_paddr, 0);
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check_and_copy(Elf32_Word, dst, src, p_filesz, 0);
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check_and_copy(Elf32_Word, dst, src, p_memsz, 0);
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check_and_copy(Elf32_Word, dst, src, p_flags, 0);
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check_and_copy(Elf32_Word, dst, src, p_align, 0);
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}
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else {
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if (valid_class(elf->e_class)) {
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seterr(ERROR_UNIMPLEMENTED);
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}
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else {
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seterr(ERROR_UNKNOWN_CLASS);
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}
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return 0;
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}
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return 1;
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}
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#endif /* __LIBELF64 */
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