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109 lines
3.0 KiB
109 lines
3.0 KiB
/* Get information from dynamic table at the 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 <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_Dyn *
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gelf_getdyn (Elf_Data *data, int ndx, GElf_Dyn *dst)
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{
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Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
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GElf_Dyn *result = NULL;
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Elf *elf;
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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_DYN))
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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 = data_scn->s->elf;
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rwlock_rdlock (elf->lock);
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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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if (elf->class == ELFCLASS32)
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{
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Elf32_Dyn *src;
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/* Here it gets a bit more complicated. The format of the symbol
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table entries has to be adopted. The user better has provided
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a buffer where we can store the information. While copying the
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data we are converting the format. */
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if (INVALID_NDX (ndx, Elf32_Dyn, &data_scn->d))
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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goto out;
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}
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src = &((Elf32_Dyn *) data_scn->d.d_buf)[ndx];
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/* This might look like a simple copy operation but it's
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not. There are zero- and sign-extensions going on. */
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dst->d_tag = src->d_tag;
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/* It OK to copy `d_val' since `d_ptr' has the same size. */
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dst->d_un.d_val = src->d_un.d_val;
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}
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else
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{
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/* If this is a 64 bit object it's easy. */
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assert (sizeof (GElf_Dyn) == sizeof (Elf64_Dyn));
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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 (INVALID_NDX (ndx, GElf_Dyn, &data_scn->d))
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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goto out;
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}
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*dst = ((GElf_Dyn *) data_scn->d.d_buf)[ndx];
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}
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result = dst;
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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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