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82 lines
2.5 KiB
82 lines
2.5 KiB
/* Get additional required symbol version information at the given offset.
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Copyright (C) 1999, 2000, 2001, 2002, 2015 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 1999.
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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 <gelf.h>
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#include <string.h>
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#include "libelfP.h"
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GElf_Vernaux *
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gelf_getvernaux (Elf_Data *data, int offset, GElf_Vernaux *dst)
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{
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GElf_Vernaux *result;
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if (data == NULL)
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return NULL;
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if (unlikely (data->d_type != ELF_T_VNEED))
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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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/* It's easy to handle this type. It has the same size for 32 and
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64 bit objects. And fortunately the `ElfXXX_Vernaux' records
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also have the same size. */
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assert (sizeof (GElf_Vernaux) == sizeof (Elf32_Verneed));
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assert (sizeof (GElf_Vernaux) == sizeof (Elf64_Verneed));
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assert (sizeof (GElf_Vernaux) == sizeof (Elf32_Vernaux));
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assert (sizeof (GElf_Vernaux) == sizeof (Elf64_Vernaux));
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rwlock_rdlock (((Elf_Data_Scn *) data)->s->elf->lock);
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/* The data is already in the correct form. Just make sure the
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index is OK. */
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if (unlikely (offset < 0)
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|| unlikely (offset + sizeof (GElf_Vernaux) > data->d_size)
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|| unlikely (offset % sizeof (GElf_Vernaux) != 0))
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{
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__libelf_seterrno (ELF_E_OFFSET_RANGE);
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result = NULL;
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}
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else
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result = (GElf_Vernaux *) memcpy (dst, (char *) data->d_buf + offset,
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sizeof (GElf_Verneed));
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rwlock_unlock (((Elf_Data_Scn *) data)->s->elf->lock);
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return result;
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}
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