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 6706 : gelf_getversym (Elf_Data *data, int ndx, GElf_Versym *dst)
43 : {
44 6706 : Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
45 : Elf_Scn *scn;
46 : GElf_Versym *result;
47 :
48 6706 : if (data == NULL)
49 : return NULL;
50 :
51 6706 : 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 6706 : 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 : assert (sizeof (GElf_Versym) == sizeof (Elf32_Versym));
65 : assert (sizeof (GElf_Versym) == sizeof (Elf64_Versym));
66 :
67 : rwlock_rdlock (scn->elf->lock);
68 :
69 : /* The data is already in the correct form. Just make sure the
70 : index is OK. */
71 6706 : 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 6706 : *dst = ((GElf_Versym *) data->d_buf)[ndx];
79 :
80 6706 : result = dst;
81 : }
82 :
83 : rwlock_unlock (scn->elf->lock);
84 :
85 6706 : return result;
86 : }
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