Branch data Line data Source code
1 : : /* Get symbol information from symbol table at the given index.
2 : : Copyright (C) 1999, 2000, 2001, 2002 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_Sym *
42 : 33225 : gelf_getsym (data, ndx, dst)
43 : : Elf_Data *data;
44 : : int ndx;
45 : : GElf_Sym *dst;
46 : : {
47 : 33225 : Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
48 : 33225 : GElf_Sym *result = NULL;
49 : :
50 [ + - ]: 33225 : if (data == NULL)
51 : : return NULL;
52 : :
53 [ - + ]: 33225 : if (unlikely (data->d_type != ELF_T_SYM))
54 : : {
55 : 0 : __libelf_seterrno (ELF_E_INVALID_HANDLE);
56 : 0 : return NULL;
57 : : }
58 : :
59 : : rwlock_rdlock (data_scn->s->elf->lock);
60 : :
61 : : /* This is the one place where we have to take advantage of the fact
62 : : that an `Elf_Data' pointer is also a pointer to `Elf_Data_Scn'.
63 : : The interface is broken so that it requires this hack. */
64 [ + + ]: 33225 : if (data_scn->s->elf->class == ELFCLASS32)
65 : : {
66 : : Elf32_Sym *src;
67 : :
68 : : /* Here it gets a bit more complicated. The format of the symbol
69 : : table entries has to be adopted. The user better has provided
70 : : a buffer where we can store the information. While copying the
71 : : data we are converting the format. */
72 [ - + ]: 25619 : if (unlikely ((ndx + 1) * sizeof (Elf32_Sym) > data->d_size))
73 : : {
74 : 0 : __libelf_seterrno (ELF_E_INVALID_INDEX);
75 : 0 : goto out;
76 : : }
77 : :
78 : 25619 : src = &((Elf32_Sym *) data->d_buf)[ndx];
79 : :
80 : : /* This might look like a simple copy operation but it's
81 : : not. There are zero- and sign-extensions going on. */
82 : : #define COPY(name) \
83 : : dst->name = src->name
84 : 25619 : COPY (st_name);
85 : : /* Please note that we can simply copy the `st_info' element since
86 : : the definitions of ELFxx_ST_BIND and ELFxx_ST_TYPE are the same
87 : : for the 64 bit variant. */
88 : 25619 : COPY (st_info);
89 : 25619 : COPY (st_other);
90 : 25619 : COPY (st_shndx);
91 : 25619 : COPY (st_value);
92 : 25619 : COPY (st_size);
93 : : }
94 : : else
95 : : {
96 : : /* If this is a 64 bit object it's easy. */
97 : : assert (sizeof (GElf_Sym) == sizeof (Elf64_Sym));
98 : :
99 : : /* The data is already in the correct form. Just make sure the
100 : : index is OK. */
101 [ - + ]: 7606 : if (unlikely ((ndx + 1) * sizeof (GElf_Sym) > data->d_size))
102 : : {
103 : 0 : __libelf_seterrno (ELF_E_INVALID_INDEX);
104 : 0 : goto out;
105 : : }
106 : :
107 : 7606 : *dst = ((GElf_Sym *) data->d_buf)[ndx];
108 : : }
109 : :
110 : 33225 : result = dst;
111 : :
112 : : out:
113 : : rwlock_unlock (data_scn->s->elf->lock);
114 : :
115 : 33225 : return result;
116 : : }
117 : : INTDEF(gelf_getsym)
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