hmz007
36ed224bac
Signed-off-by: hmz007 <hmz007@gmail.com> Change-Id: Ib87fdbe7a0be7dc961af3500fe9ea4589a127f9f
100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
/* Get section at specific index.
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Copyright (C) 2005, 2008, 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>, 2005.
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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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#ifndef LIBELFBITS
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# define LIBELFBITS 32
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#endif
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Elf_Scn *
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elfw2(LIBELFBITS,offscn) (Elf *elf, ElfW2(LIBELFBITS,Off) offset)
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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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Elf_ScnList *runp = &elf->state.ELFW(elf,LIBELFBITS).scns;
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/* If we have not looked at section headers before,
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we might need to read them in first. */
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if (runp->cnt > 0
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&& unlikely (runp->data[0].shdr.ELFW(e,LIBELFBITS) == NULL)
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&& unlikely (elfw2(LIBELFBITS,getshdr) (&runp->data[0]) == NULL))
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return NULL;
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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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while (1)
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{
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for (unsigned int i = 0; i < runp->cnt; ++i)
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if (runp->data[i].shdr.ELFW(e,LIBELFBITS)->sh_offset == offset)
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{
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result = &runp->data[i];
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/* If this section is empty, the following one has the same
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sh_offset. We presume the caller is looking for a nonempty
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section, so keep looking if this one is empty. */
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if (runp->data[i].shdr.ELFW(e,LIBELFBITS)->sh_size != 0
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&& runp->data[i].shdr.ELFW(e,LIBELFBITS)->sh_type != SHT_NOBITS)
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goto out;
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}
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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_OFFSET);
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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(elfw2(LIBELFBITS,offscn))
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