Branch data Line data Source code
1 : : /* Return build ID information for a module.
2 : : Copyright (C) 2007-2010, 2014 Red Hat, Inc.
3 : : This file is part of elfutils.
4 : :
5 : : This file is free software; you can redistribute it and/or modify
6 : : it under the terms of either
7 : :
8 : : * the GNU Lesser General Public License as published by the Free
9 : : Software Foundation; either version 3 of the License, or (at
10 : : your option) any later version
11 : :
12 : : or
13 : :
14 : : * the GNU General Public License as published by the Free
15 : : Software Foundation; either version 2 of the License, or (at
16 : : your option) any later version
17 : :
18 : : or both in parallel, as here.
19 : :
20 : : elfutils is distributed in the hope that it will be useful, but
21 : : WITHOUT ANY WARRANTY; without even the implied warranty of
22 : : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 : : General Public License for more details.
24 : :
25 : : You should have received copies of the GNU General Public License and
26 : : the GNU Lesser General Public License along with this program. If
27 : : not, see <http://www.gnu.org/licenses/>. */
28 : :
29 : : #ifdef HAVE_CONFIG_H
30 : : # include <config.h>
31 : : #endif
32 : :
33 : : #include "libdwflP.h"
34 : :
35 : : static int
36 : 356 : found_build_id (Dwfl_Module *mod, bool set,
37 : : const void *bits, int len, GElf_Addr vaddr)
38 : : {
39 [ + + ]: 356 : if (!set)
40 : : /* When checking bits, we do not compare VADDR because the
41 : : address found in a debuginfo file may not match the main
42 : : file as modified by prelink. */
43 : 98 : return 1 + (mod->build_id_len == len
44 [ + - - + ]: 98 : && !memcmp (bits, mod->build_id_bits, len));
45 : :
46 : 258 : void *copy = malloc (len);
47 [ - + ]: 258 : if (unlikely (copy == NULL))
48 : : {
49 : 0 : __libdwfl_seterrno (DWFL_E_NOMEM);
50 : 0 : return -1;
51 : : }
52 : :
53 : 258 : mod->build_id_bits = memcpy (copy, bits, len);
54 : 258 : mod->build_id_vaddr = vaddr;
55 : 258 : mod->build_id_len = len;
56 : 258 : return len;
57 : : }
58 : :
59 : : int
60 : : internal_function
61 : 378 : __libdwfl_find_build_id (Dwfl_Module *mod, bool set, Elf *elf)
62 : : {
63 : 378 : const void *build_id_bits;
64 : 378 : GElf_Addr build_id_elfaddr;
65 : 378 : int build_id_len;
66 : :
67 : : /* For mod == NULL use dwelf_elf_gnu_build_id directly. */
68 [ - + ]: 378 : assert (mod != NULL);
69 : :
70 : 378 : int result = __libdwfl_find_elf_build_id (mod, elf, &build_id_bits,
71 : : &build_id_elfaddr, &build_id_len);
72 [ + + ]: 378 : if (result <= 0)
73 : : return result;
74 : :
75 : 712 : GElf_Addr build_id_vaddr = build_id_elfaddr + (build_id_elfaddr != 0
76 [ + - ]: 356 : ? mod->main_bias : 0);
77 : 356 : return found_build_id (mod, set, build_id_bits, build_id_len, build_id_vaddr);
78 : : }
79 : :
80 : : NEW_VERSION (dwfl_module_build_id, ELFUTILS_0.138)
81 : : int
82 : 5862 : dwfl_module_build_id (Dwfl_Module *mod,
83 : : const unsigned char **bits, GElf_Addr *vaddr)
84 : : {
85 [ + - ]: 5862 : if (mod == NULL)
86 : : return -1;
87 : :
88 [ + + + + ]: 5862 : if (mod->build_id_len == 0 && mod->main.elf != NULL)
89 : : {
90 : : /* We have the file, but have not examined it yet. */
91 : 280 : int result = __libdwfl_find_build_id (mod, true, mod->main.elf);
92 [ + + ]: 280 : if (result <= 0)
93 : : {
94 : 22 : mod->build_id_len = -1; /* Cache negative result. */
95 : 22 : return result;
96 : : }
97 : : }
98 : :
99 [ + + ]: 5840 : if (mod->build_id_len <= 0)
100 : : return 0;
101 : :
102 : 5832 : *bits = mod->build_id_bits;
103 : 5832 : *vaddr = mod->build_id_vaddr;
104 : 5832 : return mod->build_id_len;
105 : : }
106 : : NEW_INTDEF (dwfl_module_build_id)
107 : :
108 : : #ifdef SYMBOL_VERSIONING
109 : : COMPAT_VERSION (dwfl_module_build_id, ELFUTILS_0.130, vaddr_at_end)
110 : :
111 : : int
112 : : _compat_vaddr_at_end_dwfl_module_build_id (Dwfl_Module *mod,
113 : : const unsigned char **bits,
114 : : GElf_Addr *vaddr)
115 : : {
116 : : int result = INTUSE(dwfl_module_build_id) (mod, bits, vaddr);
117 : : if (result > 0)
118 : : *vaddr += (result + 3) & -4;
119 : : return result;
120 : : }
121 : : #endif
|
