]>
Commit | Line | Data |
---|---|---|
b08d5a8f | 1 | /* Get REL relocation information at given index. |
1ccdfb68 | 2 | Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014, 2015 Red Hat, Inc. |
de2ed97f | 3 | This file is part of elfutils. |
b08d5a8f UD |
4 | Written by Ulrich Drepper <drepper@redhat.com>, 2000. |
5 | ||
de2ed97f MW |
6 | This file is free software; you can redistribute it and/or modify |
7 | it under the terms of either | |
b08d5a8f | 8 | |
de2ed97f MW |
9 | * 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 | |
361df7da UD |
22 | 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. | |
b08d5a8f | 25 | |
de2ed97f MW |
26 | 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/>. */ | |
b08d5a8f UD |
29 | |
30 | #ifdef HAVE_CONFIG_H | |
31 | # include <config.h> | |
32 | #endif | |
33 | ||
34 | #include <gelf.h> | |
35 | #include <string.h> | |
36 | ||
37 | #include "libelfP.h" | |
38 | ||
39 | ||
40 | GElf_Rel * | |
1ccdfb68 | 41 | gelf_getrel (Elf_Data *data, int ndx, GElf_Rel *dst) |
b08d5a8f UD |
42 | { |
43 | Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data; | |
44 | Elf_Scn *scn; | |
45 | GElf_Rel *result; | |
46 | ||
47 | if (data_scn == NULL) | |
48 | return NULL; | |
49 | ||
b08d5a8f UD |
50 | if (unlikely (data_scn->d.d_type != ELF_T_REL)) |
51 | { | |
52 | __libelf_seterrno (ELF_E_INVALID_HANDLE); | |
53 | return NULL; | |
54 | } | |
55 | ||
56 | /* This is the one place where we have to take advantage of the fact | |
57 | that an `Elf_Data' pointer is also a pointer to `Elf_Data_Scn'. | |
58 | The interface is broken so that it requires this hack. */ | |
59 | scn = data_scn->s; | |
60 | ||
b4d6f0f8 | 61 | rwlock_rdlock (scn->elf->lock); |
b08d5a8f UD |
62 | |
63 | if (scn->elf->class == ELFCLASS32) | |
64 | { | |
65 | /* We have to convert the data. */ | |
a9039623 | 66 | if (INVALID_NDX (ndx, Elf32_Rel, &data_scn->d)) |
b08d5a8f UD |
67 | { |
68 | __libelf_seterrno (ELF_E_INVALID_INDEX); | |
69 | result = NULL; | |
70 | } | |
71 | else | |
72 | { | |
73 | Elf32_Rel *src = &((Elf32_Rel *) data_scn->d.d_buf)[ndx]; | |
74 | ||
75 | dst->r_offset = src->r_offset; | |
76 | dst->r_info = GELF_R_INFO (ELF32_R_SYM (src->r_info), | |
77 | ELF32_R_TYPE (src->r_info)); | |
78 | ||
79 | result = dst; | |
80 | } | |
81 | } | |
82 | else | |
83 | { | |
84 | /* Simply copy the data after we made sure we are actually getting | |
85 | correct data. */ | |
a9039623 | 86 | if (INVALID_NDX (ndx, Elf64_Rel, &data_scn->d)) |
b08d5a8f UD |
87 | { |
88 | __libelf_seterrno (ELF_E_INVALID_INDEX); | |
89 | result = NULL; | |
90 | } | |
91 | else | |
92 | result = memcpy (dst, &((Elf64_Rel *) data_scn->d.d_buf)[ndx], | |
93 | sizeof (Elf64_Rel)); | |
94 | } | |
95 | ||
b4d6f0f8 | 96 | rwlock_unlock (scn->elf->lock); |
b08d5a8f UD |
97 | |
98 | return result; | |
99 | } |