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/*
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* x.elfext.c -- handle ELF format extensions
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* Copyright (C) 2002 - 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <private.h>
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#ifndef lint
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static const char rcsid[] = "@(#) $Id: x.elfext.c,v 1.3 2006/07/07 22:17:50 michael Exp $";
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#endif /* lint */
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int
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elf_getphnum(Elf *elf, size_t *resultp) {
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if (!elf) {
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return LIBELF_FAILURE;
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}
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elf_assert(elf->e_magic == ELF_MAGIC);
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if (elf->e_kind != ELF_K_ELF) {
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seterr(ERROR_NOTELF);
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return LIBELF_FAILURE;
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}
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if (!elf->e_ehdr && !_elf_cook(elf)) {
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return LIBELF_FAILURE;
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}
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if (resultp) {
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*resultp = elf->e_phnum;
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}
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return LIBELF_SUCCESS;
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}
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int
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elf_getshnum(Elf *elf, size_t *resultp) {
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size_t num = 0;
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Elf_Scn *scn;
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if (!elf) {
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return LIBELF_FAILURE;
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}
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elf_assert(elf->e_magic == ELF_MAGIC);
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if (elf->e_kind != ELF_K_ELF) {
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seterr(ERROR_NOTELF);
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return LIBELF_FAILURE;
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}
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if (!elf->e_ehdr && !_elf_cook(elf)) {
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return LIBELF_FAILURE;
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}
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if ((scn = elf->e_scn_n)) {
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num = scn->s_index + 1;
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}
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if (resultp) {
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*resultp = num;
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}
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return LIBELF_SUCCESS;
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}
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int
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elf_getshstrndx(Elf *elf, size_t *resultp) {
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size_t num = 0;
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size_t dummy;
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Elf_Scn *scn;
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if (!elf) {
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return LIBELF_FAILURE;
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}
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elf_assert(elf->e_magic == ELF_MAGIC);
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if (resultp == NULL) {
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resultp = &dummy; /* handle NULL pointer gracefully */
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}
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if (elf->e_kind != ELF_K_ELF) {
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seterr(ERROR_NOTELF);
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return LIBELF_FAILURE;
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}
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if (!elf->e_ehdr && !_elf_cook(elf)) {
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return LIBELF_FAILURE;
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}
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if (elf->e_class == ELFCLASS32) {
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num = ((Elf32_Ehdr*)elf->e_ehdr)->e_shstrndx;
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}
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#if __LIBELF64
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else if (elf->e_class == ELFCLASS64) {
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num = ((Elf64_Ehdr*)elf->e_ehdr)->e_shstrndx;
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}
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#endif /* __LIBELF64 */
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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 LIBELF_FAILURE;
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}
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if (num != SHN_XINDEX) {
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*resultp = num;
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return LIBELF_SUCCESS;
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}
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/*
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* look at first section header
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*/
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if (!(scn = elf->e_scn_1)) {
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seterr(ERROR_NOSUCHSCN);
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return LIBELF_FAILURE;
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}
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elf_assert(scn->s_magic == SCN_MAGIC);
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#if __LIBELF64
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if (elf->e_class == ELFCLASS64) {
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*resultp = scn->s_shdr64.sh_link;
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return LIBELF_SUCCESS;
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}
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#endif /* __LIBELF64 */
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*resultp = scn->s_shdr32.sh_link;
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return LIBELF_SUCCESS;
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}
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int
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elfx_update_shstrndx(Elf *elf, size_t value) {
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size_t extvalue = 0;
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Elf_Scn *scn;
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if (!elf) {
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return LIBELF_FAILURE;
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}
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elf_assert(elf->e_magic == ELF_MAGIC);
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if (value >= SHN_LORESERVE) {
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extvalue = value;
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value = SHN_XINDEX;
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}
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if (elf->e_kind != ELF_K_ELF) {
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seterr(ERROR_NOTELF);
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return LIBELF_FAILURE;
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}
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if (!elf->e_ehdr && !_elf_cook(elf)) {
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return LIBELF_FAILURE;
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}
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if (!(scn = _elf_first_scn(elf))) {
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return LIBELF_FAILURE;
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}
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elf_assert(scn->s_magic == SCN_MAGIC);
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if (elf->e_class == ELFCLASS32) {
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((Elf32_Ehdr*)elf->e_ehdr)->e_shstrndx = value;
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scn->s_shdr32.sh_link = extvalue;
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}
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#if __LIBELF64
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else if (elf->e_class == ELFCLASS64) {
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((Elf64_Ehdr*)elf->e_ehdr)->e_shstrndx = value;
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scn->s_shdr64.sh_link = extvalue;
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}
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#endif /* __LIBELF64 */
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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 LIBELF_FAILURE;
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}
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elf->e_ehdr_flags |= ELF_F_DIRTY;
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scn->s_shdr_flags |= ELF_F_DIRTY;
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return LIBELF_SUCCESS;
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}
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