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121 lines
2.9 KiB
121 lines
2.9 KiB
/* Get section at specific index.
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Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2015 Red Hat, Inc.
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This file is part of elfutils.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 1998.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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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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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <assert.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include "libelfP.h"
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Elf_Scn *
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elf_getscn (Elf *elf, size_t idx)
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{
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if (elf == NULL)
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return NULL;
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if (unlikely (elf->kind != ELF_K_ELF))
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{
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__libelf_seterrno (ELF_E_INVALID_HANDLE);
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return NULL;
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}
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rwlock_rdlock (elf->lock);
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Elf_Scn *result = NULL;
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/* Find the section in the list. */
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Elf_ScnList *runp = (elf->class == ELFCLASS32
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|| (offsetof (struct Elf, state.elf32.scns)
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== offsetof (struct Elf, state.elf64.scns))
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? &elf->state.elf32.scns : &elf->state.elf64.scns);
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/* Section zero is special. It always exists even if there is no
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"first" section. And it is needed to store "overflow" values
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from the Elf header. */
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if (idx == 0 && runp->cnt == 0 && runp->max > 0)
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{
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Elf_Scn *scn0 = &runp->data[0];
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if (elf->class == ELFCLASS32)
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{
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scn0->shdr.e32 = (Elf32_Shdr *) calloc (1, sizeof (Elf32_Shdr));
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if (scn0->shdr.e32 == NULL)
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{
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__libelf_seterrno (ELF_E_NOMEM);
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goto out;
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}
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}
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else
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{
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scn0->shdr.e64 = (Elf64_Shdr *) calloc (1, sizeof (Elf64_Shdr));
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if (scn0->shdr.e64 == NULL)
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{
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__libelf_seterrno (ELF_E_NOMEM);
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goto out;
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}
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}
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scn0->elf = elf;
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scn0->shdr_flags = ELF_F_DIRTY | ELF_F_MALLOCED;
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scn0->list = elf->state.elf.scns_last;
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scn0->data_read = 1;
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runp->cnt = 1;
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}
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while (1)
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{
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if (idx < runp->max)
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{
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if (idx < runp->cnt)
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result = &runp->data[idx];
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else
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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break;
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}
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idx -= runp->max;
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runp = runp->next;
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if (runp == NULL)
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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break;
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}
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}
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out:
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rwlock_unlock (elf->lock);
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return result;
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}
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INTDEF(elf_getscn)
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