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/*
* newscn.c - implementation of the elf_newscn(3) function.
* Copyright (C) 1995 - 2006 Michael Riepe
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <private.h>
#ifndef lint
static const char rcsid[] = "@(#) $Id: newscn.c,v 1.13 2008/05/23 08:15:35 michael Exp $";
#endif /* lint */
int
_elf_update_shnum(Elf *elf, size_t shnum) {
size_t extshnum = 0;
Elf_Scn *scn;
elf_assert(elf);
elf_assert(elf->e_ehdr);
scn = elf->e_scn_1;
elf_assert(scn);
elf_assert(scn->s_index == 0);
if (shnum >= SHN_LORESERVE) {
extshnum = shnum;
shnum = 0;
}
if (elf->e_class == ELFCLASS32) {
((Elf32_Ehdr*)elf->e_ehdr)->e_shnum = shnum;
scn->s_shdr32.sh_size = extshnum;
}
#if __LIBELF64
else if (elf->e_class == ELFCLASS64) {
((Elf64_Ehdr*)elf->e_ehdr)->e_shnum = shnum;
scn->s_shdr64.sh_size = extshnum;
}
#endif /* __LIBELF64 */
else {
if (valid_class(elf->e_class)) {
seterr(ERROR_UNIMPLEMENTED);
}
else {
seterr(ERROR_UNKNOWN_CLASS);
}
return -1;
}
elf->e_ehdr_flags |= ELF_F_DIRTY;
scn->s_shdr_flags |= ELF_F_DIRTY;
return 0;
}
static Elf_Scn*
_makescn(Elf *elf, size_t index) {
Elf_Scn *scn;
elf_assert(elf);
elf_assert(elf->e_magic == ELF_MAGIC);
elf_assert(elf->e_ehdr);
elf_assert(_elf_scn_init.s_magic == SCN_MAGIC);
if (!(scn = (Elf_Scn*)malloc(sizeof(*scn)))) {
seterr(ERROR_MEM_SCN);
return NULL;
}
*scn = _elf_scn_init;
scn->s_elf = elf;
scn->s_scn_flags = ELF_F_DIRTY;
scn->s_shdr_flags = ELF_F_DIRTY;
scn->s_freeme = 1;
scn->s_index = index;
return scn;
}
Elf_Scn*
_elf_first_scn(Elf *elf) {
Elf_Scn *scn;
elf_assert(elf);
elf_assert(elf->e_magic == ELF_MAGIC);
if ((scn = elf->e_scn_1)) {
return scn;
}
if ((scn = _makescn(elf, 0))) {
elf->e_scn_1 = elf->e_scn_n = scn;
if (_elf_update_shnum(elf, 1)) {
free(scn);
elf->e_scn_1 = elf->e_scn_n = scn = NULL;
}
}
return scn;
}
static Elf_Scn*
_buildscn(Elf *elf) {
Elf_Scn *scn;
if (!_elf_first_scn(elf)) {
return NULL;
}
scn = elf->e_scn_n;
elf_assert(scn);
if (!(scn = _makescn(elf, scn->s_index + 1))) {
return NULL;
}
if (_elf_update_shnum(elf, scn->s_index + 1)) {
free(scn);
return NULL;
}
elf->e_scn_n = elf->e_scn_n->s_link = scn;
return scn;
}
Elf_Scn*
elf_newscn(Elf *elf) {
Elf_Scn *scn;
if (!elf) {
return NULL;
}
elf_assert(elf->e_magic == ELF_MAGIC);
if (!elf->e_readable && !elf->e_ehdr) {
seterr(ERROR_NOEHDR);
}
else if (elf->e_kind != ELF_K_ELF) {
seterr(ERROR_NOTELF);
}
else if (!elf->e_ehdr && !_elf_cook(elf)) {
return NULL;
}
else if ((scn = _buildscn(elf))) {
return scn;
}
return NULL;
}
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