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100 lines
2.6 KiB
100 lines
2.6 KiB
/* Get REL relocation information at given index.
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Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014, 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>, 2000.
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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 <gelf.h>
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#include <string.h>
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#include "libelfP.h"
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GElf_Rel *
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gelf_getrel (Elf_Data *data, int ndx, GElf_Rel *dst)
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{
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Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
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Elf_Scn *scn;
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GElf_Rel *result;
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if (data_scn == NULL)
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return NULL;
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if (unlikely (data_scn->d.d_type != ELF_T_REL))
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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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/* This is the one place where we have to take advantage of the fact
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that an `Elf_Data' pointer is also a pointer to `Elf_Data_Scn'.
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The interface is broken so that it requires this hack. */
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scn = data_scn->s;
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rwlock_rdlock (scn->elf->lock);
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if (scn->elf->class == ELFCLASS32)
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{
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/* We have to convert the data. */
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if (INVALID_NDX (ndx, Elf32_Rel, &data_scn->d))
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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result = NULL;
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}
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else
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{
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Elf32_Rel *src = &((Elf32_Rel *) data_scn->d.d_buf)[ndx];
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dst->r_offset = src->r_offset;
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dst->r_info = GELF_R_INFO (ELF32_R_SYM (src->r_info),
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ELF32_R_TYPE (src->r_info));
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result = dst;
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}
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}
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else
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{
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/* Simply copy the data after we made sure we are actually getting
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correct data. */
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if (INVALID_NDX (ndx, Elf64_Rel, &data_scn->d))
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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result = NULL;
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}
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else
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result = memcpy (dst, &((Elf64_Rel *) data_scn->d.d_buf)[ndx],
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sizeof (Elf64_Rel));
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}
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rwlock_unlock (scn->elf->lock);
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return result;
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}
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