1/* Update REL relocation information at given index.
2   Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
3   Written by Ulrich Drepper <drepper@redhat.com>, 2000.
4
5   This program is free software; you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation, version 2.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program; if not, write to the Free Software Foundation,
16   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
17
18#ifdef HAVE_CONFIG_H
19# include <config.h>
20#endif
21
22#include <gelf.h>
23#include <stdlib.h>
24
25#include "libelfP.h"
26
27
28int
29gelf_update_rel (Elf_Data *dst, int ndx, GElf_Rel *src)
30{
31  Elf_Data_Scn *data_scn = (Elf_Data_Scn *) dst;
32  Elf_Scn *scn;
33  int result = 0;
34
35  if (dst == NULL)
36    return 0;
37
38  if (unlikely (ndx < 0))
39    {
40      __libelf_seterrno (ELF_E_INVALID_INDEX);
41      return 0;
42    }
43
44  if (unlikely (data_scn->d.d_type != ELF_T_REL))
45    {
46      /* The type of the data better should match.  */
47      __libelf_seterrno (ELF_E_DATA_MISMATCH);
48      return 0;
49    }
50
51  scn = data_scn->s;
52  rwlock_wrlock (scn->elf->lock);
53
54  if (scn->elf->class == ELFCLASS32)
55    {
56      Elf32_Rel *rel;
57
58      /* There is the possibility that the values in the input are
59	 too large.  */
60      if (unlikely (src->r_offset > 0xffffffffull)
61	  || unlikely (GELF_R_SYM (src->r_info) > 0xffffff)
62	  || unlikely (GELF_R_TYPE (src->r_info) > 0xff))
63	{
64	  __libelf_seterrno (ELF_E_INVALID_DATA);
65	  goto out;
66	}
67
68      /* Check whether we have to resize the data buffer.  */
69      if (unlikely ((ndx + 1) * sizeof (Elf32_Rel) > data_scn->d.d_size))
70	{
71	  __libelf_seterrno (ELF_E_INVALID_INDEX);
72	  goto out;
73	}
74
75      rel = &((Elf32_Rel *) data_scn->d.d_buf)[ndx];
76
77      rel->r_offset = src->r_offset;
78      rel->r_info = ELF32_R_INFO (GELF_R_SYM (src->r_info),
79				  GELF_R_TYPE (src->r_info));
80    }
81  else
82    {
83      /* Check whether we have to resize the data buffer.  */
84      if (unlikely ((ndx + 1) * sizeof (Elf64_Rel) > data_scn->d.d_size))
85	{
86	  __libelf_seterrno (ELF_E_INVALID_INDEX);
87	  goto out;
88	}
89
90      ((Elf64_Rel *) data_scn->d.d_buf)[ndx] = *src;
91    }
92
93  result = 1;
94
95  /* Mark the section as modified.  */
96  scn->flags |= ELF_F_DIRTY;
97
98 out:
99  rwlock_unlock (scn->elf->lock);
100
101  return result;
102}
103