You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
108 lines
3.0 KiB
108 lines
3.0 KiB
/* Get information from auxiliary vector at the given index.
|
|
Copyright (C) 2007, 2015 Red Hat, Inc.
|
|
This file is part of elfutils.
|
|
|
|
This file is free software; you can redistribute it and/or modify
|
|
it under the terms of either
|
|
|
|
* the GNU Lesser General Public License as published by the Free
|
|
Software Foundation; either version 3 of the License, or (at
|
|
your option) any later version
|
|
|
|
or
|
|
|
|
* the GNU General Public License as published by the Free
|
|
Software Foundation; either version 2 of the License, or (at
|
|
your option) any later version
|
|
|
|
or both in parallel, as here.
|
|
|
|
elfutils 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 copies of the GNU General Public License and
|
|
the GNU Lesser General Public License along with this program. If
|
|
not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#include <assert.h>
|
|
#include <gelf.h>
|
|
#include <string.h>
|
|
|
|
#include "libelfP.h"
|
|
|
|
|
|
GElf_auxv_t *
|
|
gelf_getauxv (Elf_Data *data, int ndx, GElf_auxv_t *dst)
|
|
{
|
|
Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
|
|
GElf_auxv_t *result = NULL;
|
|
Elf *elf;
|
|
|
|
if (data_scn == NULL)
|
|
return NULL;
|
|
|
|
if (unlikely (data_scn->d.d_type != ELF_T_AUXV))
|
|
{
|
|
__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_auxv_t *src;
|
|
|
|
/* Here it gets a bit more complicated. The format of the vector
|
|
entries has to be converted. The user better have provided a
|
|
buffer where we can store the information. While copying the data
|
|
we convert the format. */
|
|
if (unlikely ((ndx + 1) * sizeof (Elf32_auxv_t) > data_scn->d.d_size))
|
|
{
|
|
__libelf_seterrno (ELF_E_INVALID_INDEX);
|
|
goto out;
|
|
}
|
|
|
|
src = &((Elf32_auxv_t *) 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->a_type = src->a_type;
|
|
dst->a_un.a_val = src->a_un.a_val;
|
|
}
|
|
else
|
|
{
|
|
/* If this is a 64 bit object it's easy. */
|
|
assert (sizeof (GElf_auxv_t) == sizeof (Elf64_auxv_t));
|
|
|
|
/* The data is already in the correct form. Just make sure the
|
|
index is OK. */
|
|
if (unlikely ((ndx + 1) * sizeof (GElf_auxv_t) > data_scn->d.d_size))
|
|
{
|
|
__libelf_seterrno (ELF_E_INVALID_INDEX);
|
|
goto out;
|
|
}
|
|
|
|
memcpy (dst, data_scn->d.d_buf + ndx * sizeof (GElf_auxv_t),
|
|
sizeof (GElf_auxv_t));
|
|
}
|
|
|
|
result = dst;
|
|
|
|
out:
|
|
rwlock_unlock (elf->lock);
|
|
|
|
return result;
|
|
}
|