blob: d13e4028019e93228ba5dbee8b5e764a8f464887 [file] [log] [blame]
Ulrich Drepperb08d5a82005-07-26 05:00:05 +00001/* Update REL relocation information at given index.
2 Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
Mark Wielaardde2ed972012-06-05 17:15:16 +02003 This file is part of elfutils.
Ulrich Drepperb08d5a82005-07-26 05:00:05 +00004 Written by Ulrich Drepper <drepper@redhat.com>, 2000.
5
Mark Wielaardde2ed972012-06-05 17:15:16 +02006 This file is free software; you can redistribute it and/or modify
7 it under the terms of either
Ulrich Drepperb08d5a82005-07-26 05:00:05 +00008
Mark Wielaardde2ed972012-06-05 17:15:16 +02009 * the GNU Lesser General Public License as published by the Free
10 Software Foundation; either version 3 of the License, or (at
11 your option) any later version
12
13 or
14
15 * the GNU General Public License as published by the Free
16 Software Foundation; either version 2 of the License, or (at
17 your option) any later version
18
19 or both in parallel, as here.
20
21 elfutils is distributed in the hope that it will be useful, but
Ulrich Drepper361df7d2006-04-04 21:38:57 +000022 WITHOUT ANY WARRANTY; without even the implied warranty of
23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 General Public License for more details.
Ulrich Drepperb08d5a82005-07-26 05:00:05 +000025
Mark Wielaardde2ed972012-06-05 17:15:16 +020026 You should have received copies of the GNU General Public License and
27 the GNU Lesser General Public License along with this program. If
28 not, see <http://www.gnu.org/licenses/>. */
Ulrich Drepperb08d5a82005-07-26 05:00:05 +000029
30#ifdef HAVE_CONFIG_H
31# include <config.h>
32#endif
33
34#include <gelf.h>
35#include <stdlib.h>
36
37#include "libelfP.h"
38
39
40int
41gelf_update_rel (Elf_Data *dst, int ndx, GElf_Rel *src)
42{
43 Elf_Data_Scn *data_scn = (Elf_Data_Scn *) dst;
44 Elf_Scn *scn;
45 int result = 0;
46
47 if (dst == NULL)
48 return 0;
49
50 if (unlikely (ndx < 0))
51 {
52 __libelf_seterrno (ELF_E_INVALID_INDEX);
53 return 0;
54 }
55
56 if (unlikely (data_scn->d.d_type != ELF_T_REL))
57 {
58 /* The type of the data better should match. */
59 __libelf_seterrno (ELF_E_DATA_MISMATCH);
60 return 0;
61 }
62
63 scn = data_scn->s;
Roland McGrathb4d6f0f2008-08-25 22:55:17 +000064 rwlock_wrlock (scn->elf->lock);
Ulrich Drepperb08d5a82005-07-26 05:00:05 +000065
66 if (scn->elf->class == ELFCLASS32)
67 {
68 Elf32_Rel *rel;
69
70 /* There is the possibility that the values in the input are
71 too large. */
72 if (unlikely (src->r_offset > 0xffffffffull)
73 || unlikely (GELF_R_SYM (src->r_info) > 0xffffff)
74 || unlikely (GELF_R_TYPE (src->r_info) > 0xff))
75 {
76 __libelf_seterrno (ELF_E_INVALID_DATA);
77 goto out;
78 }
79
80 /* Check whether we have to resize the data buffer. */
81 if (unlikely ((ndx + 1) * sizeof (Elf32_Rel) > data_scn->d.d_size))
82 {
83 __libelf_seterrno (ELF_E_INVALID_INDEX);
84 goto out;
85 }
86
87 rel = &((Elf32_Rel *) data_scn->d.d_buf)[ndx];
88
89 rel->r_offset = src->r_offset;
90 rel->r_info = ELF32_R_INFO (GELF_R_SYM (src->r_info),
91 GELF_R_TYPE (src->r_info));
92 }
93 else
94 {
95 /* Check whether we have to resize the data buffer. */
96 if (unlikely ((ndx + 1) * sizeof (Elf64_Rel) > data_scn->d.d_size))
97 {
98 __libelf_seterrno (ELF_E_INVALID_INDEX);
99 goto out;
100 }
101
102 ((Elf64_Rel *) data_scn->d.d_buf)[ndx] = *src;
103 }
104
105 result = 1;
106
107 /* Mark the section as modified. */
108 scn->flags |= ELF_F_DIRTY;
109
110 out:
Roland McGrathb4d6f0f2008-08-25 22:55:17 +0000111 rwlock_unlock (scn->elf->lock);
Ulrich Drepperb08d5a82005-07-26 05:00:05 +0000112
113 return result;
114}