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/*
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* newscn.c - implementation of the elf_newscn(3) function.
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* Copyright (C) 1995 - 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: newscn.c,v 1.12 2006/07/07 22:17:01 michael Exp $";
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#endif /* lint */
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int
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_elf_update_shnum(Elf *elf, size_t shnum) {
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size_t extshnum = 0;
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Elf_Scn *scn;
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elf_assert(elf);
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elf_assert(elf->e_ehdr);
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scn = elf->e_scn_1;
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elf_assert(scn);
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elf_assert(scn->s_index == 0);
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if (shnum >= SHN_LORESERVE) {
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extshnum = shnum;
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shnum = 0;
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}
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if (elf->e_class == ELFCLASS32) {
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((Elf32_Ehdr*)elf->e_ehdr)->e_shnum = shnum;
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scn->s_shdr32.sh_size = extshnum;
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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_shnum = shnum;
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scn->s_shdr64.sh_size = extshnum;
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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 -1;
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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 0;
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}
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static Elf_Scn*
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_makescn(Elf *elf, size_t index) {
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Elf_Scn *scn;
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elf_assert(elf);
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elf_assert(elf->e_magic == ELF_MAGIC);
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elf_assert(elf->e_ehdr);
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elf_assert(_elf_scn_init.s_magic == SCN_MAGIC);
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if (!(scn = (Elf_Scn*)malloc(sizeof(*scn)))) {
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seterr(ERROR_MEM_SCN);
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return NULL;
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}
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*scn = _elf_scn_init;
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scn->s_elf = elf;
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scn->s_scn_flags = ELF_F_DIRTY;
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scn->s_shdr_flags = ELF_F_DIRTY;
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scn->s_freeme = 1;
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scn->s_index = index;
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return scn;
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}
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Elf_Scn*
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_elf_first_scn(Elf *elf) {
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Elf_Scn *scn;
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elf_assert(elf);
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elf_assert(elf->e_magic == ELF_MAGIC);
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if ((scn = elf->e_scn_1)) {
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return scn;
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}
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if ((scn = _makescn(elf, 0))) {
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elf->e_scn_1 = elf->e_scn_n = scn;
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if (_elf_update_shnum(elf, 1)) {
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free(scn);
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elf->e_scn_1 = elf->e_scn_n = scn = NULL;
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}
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}
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return scn;
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}
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static Elf_Scn*
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_buildscn(Elf *elf) {
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Elf_Scn *scn;
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if (!_elf_first_scn(elf)) {
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return NULL;
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}
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scn = elf->e_scn_n;
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elf_assert(scn);
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if (!(scn = _makescn(elf, scn->s_index + 1))) {
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return NULL;
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}
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if (_elf_update_shnum(elf, scn->s_index + 1)) {
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free(scn);
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return NULL;
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}
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elf->e_scn_n = elf->e_scn_n->s_link = scn;
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return scn;
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}
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Elf_Scn*
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elf_newscn(Elf *elf) {
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Elf_Scn *scn;
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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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if (!elf->e_readable && !elf->e_ehdr) {
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seterr(ERROR_NOEHDR);
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}
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else if (elf->e_kind != ELF_K_ELF) {
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seterr(ERROR_NOTELF);
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}
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else if (!elf->e_ehdr && !_elf_cook(elf)) {
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return NULL;
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}
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else if ((scn = _buildscn(elf))) {
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return scn;
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}
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return NULL;
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}
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