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/* Update REL relocation information at given index.
Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014 Red Hat, Inc.
This file is part of elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2000.
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 <gelf.h>
#include <stdlib.h>
#include "libelfP.h"
#define EF_MIPS_ABI 0x0000F000
int
gelf_update_rel (Elf_Data *dst, int ndx, GElf_Rel *src)
{
Elf_Data_Scn *data_scn = (Elf_Data_Scn *) dst;
Elf_Scn *scn;
int result = 0;
if (dst == NULL)
return 0;
if (unlikely (data_scn->d.d_type != ELF_T_REL))
{
/* The type of the data better should match. */
__libelf_seterrno (ELF_E_DATA_MISMATCH);
return 0;
}
scn = data_scn->s;
rwlock_wrlock (scn->elf->lock);
if (scn->elf->class == ELFCLASS32)
{
Elf32_Rel *rel;
/* There is the possibility that the values in the input are
too large. */
if (unlikely (src->r_offset > 0xffffffffull)
|| unlikely (GELF_R_SYM (src->r_info) > 0xffffff)
|| unlikely (GELF_R_TYPE (src->r_info) > 0xff))
{
__libelf_seterrno (ELF_E_INVALID_DATA);
goto out;
}
/* Check whether we have to resize the data buffer. */
if (INVALID_NDX (ndx, Elf32_Rel, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
}
rel = &((Elf32_Rel *) data_scn->d.d_buf)[ndx];
rel->r_offset = src->r_offset;
rel->r_info = ELF32_R_INFO (GELF_R_SYM (src->r_info),
GELF_R_TYPE (src->r_info));
}
else
{
GElf_Ehdr hdr;
GElf_Rel value = *src;
/* Check whether we have to resize the data buffer. */
if (INVALID_NDX (ndx, Elf64_Rel, &data_scn->d))
{
__libelf_seterrno (ELF_E_INVALID_INDEX);
goto out;
}
if (gelf_getehdr(scn->elf, &hdr) != NULL &&
hdr.e_ident[EI_DATA] == ELFDATA2LSB &&
hdr.e_machine == EM_MIPS &&
(hdr.e_flags & EF_MIPS_ABI) == 0)
{
/* Undo the MIPSEL N64 hack from gelf_getrel */
GElf_Xword r_info = value.r_info;
value.r_info = (r_info >> 32) |
((r_info << 8) & 0x000000FF00000000) |
((r_info << 24) & 0x0000FF0000000000) |
((r_info << 40) & 0x00FF000000000000) |
((r_info << 56) & 0xFF00000000000000);
}
((Elf64_Rel *) data_scn->d.d_buf)[ndx] = value;
}
result = 1;
/* Mark the section as modified. */
scn->flags |= ELF_F_DIRTY;
out:
rwlock_unlock (scn->elf->lock);
return result;
}
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