/* 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"

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

    {

      /* 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;

	}

      ((Elf64_Rel *) data_scn->d.d_buf)[ndx] = *src;

    }

  result = 1;

  /* Mark the section as modified.  */

  scn->flags |= ELF_F_DIRTY;

 out:

  rwlock_unlock (scn->elf->lock);

  return result;

}