Branch data Line data Source code
1 : : /* Get REL relocation information at given index.
2 : : Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014, 2015 Red Hat, Inc.
3 : : This file is part of elfutils.
4 : : Written by Ulrich Drepper <drepper@redhat.com>, 2000.
5 : :
6 : : This file is free software; you can redistribute it and/or modify
7 : : it under the terms of either
8 : :
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
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.
25 : :
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/>. */
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 *
41 : 51643 : gelf_getrel (Elf_Data *data, int ndx, GElf_Rel *dst)
42 : : {
43 : 51643 : Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
44 : 51643 : Elf_Scn *scn;
45 : 51643 : GElf_Rel *result;
46 : :
47 [ + - ]: 51643 : if (data_scn == NULL)
48 : : return NULL;
49 : :
50 [ - + ]: 51643 : if (unlikely (data_scn->d.d_type != ELF_T_REL))
51 : : {
52 : 0 : __libelf_seterrno (ELF_E_INVALID_HANDLE);
53 : 0 : 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 : 51643 : scn = data_scn->s;
60 : :
61 : 51643 : rwlock_rdlock (scn->elf->lock);
62 : :
63 [ + + ]: 51643 : if (scn->elf->class == ELFCLASS32)
64 : : {
65 : : /* We have to convert the data. */
66 [ - + ]: 51625 : if (INVALID_NDX (ndx, Elf32_Rel, &data_scn->d))
67 : : {
68 : 0 : __libelf_seterrno (ELF_E_INVALID_INDEX);
69 : 0 : result = NULL;
70 : : }
71 : : else
72 : : {
73 : 51625 : Elf32_Rel *src = &((Elf32_Rel *) data_scn->d.d_buf)[ndx];
74 : :
75 : 51625 : dst->r_offset = src->r_offset;
76 : 51625 : dst->r_info = GELF_R_INFO (ELF32_R_SYM (src->r_info),
77 : : ELF32_R_TYPE (src->r_info));
78 : :
79 : 51625 : result = dst;
80 : : }
81 : : }
82 : : else
83 : : {
84 : : /* Simply copy the data after we made sure we are actually getting
85 : : correct data. */
86 [ - + ]: 18 : if (INVALID_NDX (ndx, Elf64_Rel, &data_scn->d))
87 : : {
88 : 0 : __libelf_seterrno (ELF_E_INVALID_INDEX);
89 : 0 : result = NULL;
90 : : }
91 : : else
92 : 36 : result = memcpy (dst, &((Elf64_Rel *) data_scn->d.d_buf)[ndx],
93 : : sizeof (Elf64_Rel));
94 : : }
95 : :
96 : 51643 : rwlock_unlock (scn->elf->lock);
97 : :
98 : 51643 : return result;
99 : : }
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