Branch data Line data Source code
1 : : /* Get symbol version information at the given index.
2 : : Copyright (C) 1999, 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>, 1999.
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 <assert.h>
35 : : #include <gelf.h>
36 : : #include <string.h>
37 : :
38 : : #include "libelfP.h"
39 : :
40 : :
41 : : GElf_Versym *
42 : 17338 : gelf_getversym (Elf_Data *data, int ndx, GElf_Versym *dst)
43 : : {
44 : 17338 : Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
45 : 17338 : Elf_Scn *scn;
46 : 17338 : GElf_Versym *result;
47 : :
48 [ - + ]: 17338 : if (data == NULL)
49 : : return NULL;
50 : :
51 [ - + ]: 17338 : if (unlikely (data->d_type != ELF_T_HALF))
52 : : {
53 : 0 : __libelf_seterrno (ELF_E_INVALID_HANDLE);
54 : 0 : return NULL;
55 : : }
56 : :
57 : : /* This is the one place where we have to take advantage of the fact
58 : : that an `Elf_Data' pointer is also a pointer to `Elf_Data_Scn'.
59 : : The interface is broken so that it requires this hack. */
60 : 17338 : scn = data_scn->s;
61 : :
62 : : /* It's easy to handle this type. It has the same size for 32 and
63 : : 64 bit objects. */
64 : 17338 : assert (sizeof (GElf_Versym) == sizeof (Elf32_Versym));
65 : 17338 : assert (sizeof (GElf_Versym) == sizeof (Elf64_Versym));
66 : :
67 : 17338 : rwlock_rdlock (scn->elf->lock);
68 : :
69 : : /* The data is already in the correct form. Just make sure the
70 : : index is OK. */
71 [ - + ]: 17338 : if (INVALID_NDX (ndx, GElf_Versym, data))
72 : : {
73 : 0 : __libelf_seterrno (ELF_E_INVALID_INDEX);
74 : 0 : result = NULL;
75 : : }
76 : : else
77 : : {
78 : 17338 : *dst = ((GElf_Versym *) data->d_buf)[ndx];
79 : :
80 : 17338 : result = dst;
81 : : }
82 : :
83 : 17338 : rwlock_unlock (scn->elf->lock);
84 : :
85 : 17338 : return result;
86 : : }
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