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/* Get information from dynamic table at the given index.
Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
Written by Ulrich Drepper <drepper@redhat.com>, 2000.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as
published by the Free Software Foundation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <assert.h>
#include <gelf.h>
#include <string.h>
#include "libelfP.h"
GElf_Dyn *
gelf_getdyn (data, ndx, dst)
Elf_Data *data;
int ndx;
GElf_Dyn *dst;
{
Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
GElf_Dyn *result = NULL;
Elf *elf;
if (data_scn == NULL)
return NULL;
if (unlikely (data_scn->d.d_type != ELF_T_DYN))
{
__libelf_seterrno (ELF_E_INVALID_HANDLE);
return NULL;
}
elf = data_scn->s->elf;
rwlock_rdlock (elf->lock);
/* This is the one place where we have to take advantage of the fact
that an `Elf_Data' pointer is also a pointer to `Elf_Data_Scn'.
The interface is broken so that it requires this hack. */
if (elf->class == ELFCLASS32)
{
Elf32_Dyn *src;
/* Here it gets a bit more complicated. The format of the symbol
table entries has to be adopted. The user better has provided
a buffer where we can store the information. While copying the
data we are converting the format. */
if (unlikely ((ndx + 1) * sizeof (Elf32_Dyn) > data_scn->d.d_size))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
}
src = &((Elf32_Dyn *) data_scn->d.d_buf)[ndx];
/* This might look like a simple copy operation but it's
not. There are zero- and sign-extensions going on. */
dst->d_tag = src->d_tag;
/* It OK to copy `d_val' since `d_ptr' has the same size. */
dst->d_un.d_val = src->d_un.d_val;
}
else
{
/* If this is a 64 bit object it's easy. */
assert (sizeof (GElf_Dyn) == sizeof (Elf64_Dyn));
/* The data is already in the correct form. Just make sure the
index is OK. */
if (unlikely ((ndx + 1) * sizeof (GElf_Dyn) > data_scn->d.d_size))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
}
*dst = ((GElf_Dyn *) data_scn->d.d_buf)[ndx];
}
result = dst;
out:
rwlock_unlock (elf->lock);
return result;
}
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