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8c2e201b | 1 | /* ELF symbol resolve functions for VDSO objects. |
d614a753 | 2 | Copyright (C) 2005-2020 Free Software Foundation, Inc. |
8c2e201b UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
8c2e201b UD |
18 | |
19 | #include "config.h" | |
8c2e201b UD |
20 | #include <ldsodefs.h> |
21 | ||
22 | ||
23 | void * | |
fb86328a | 24 | _dl_vdso_vsym (const char *name, const struct r_found_version *vers) |
8c2e201b UD |
25 | { |
26 | struct link_map *map = GLRO (dl_sysinfo_map); | |
27 | void *value = NULL; | |
28 | ||
29 | ||
30 | if (map != NULL) | |
31 | { | |
32 | /* Use a WEAK REF so we don't error out if the symbol is not found. */ | |
33 | ElfW (Sym) wsym; | |
34 | memset (&wsym, 0, sizeof (ElfW (Sym))); | |
35 | wsym.st_info = (unsigned char) ELFW (ST_INFO (STB_WEAK, STT_NOTYPE)); | |
36 | ||
8c2e201b UD |
37 | /* Search the scope of the vdso map. */ |
38 | const ElfW (Sym) *ref = &wsym; | |
39 | lookup_t result = GLRO (dl_lookup_symbol_x) (name, map, &ref, | |
40 | map->l_local_scope, | |
fb86328a | 41 | vers, 0, 0, NULL); |
8c2e201b UD |
42 | |
43 | if (ref != NULL) | |
44 | value = DL_SYMBOL_ADDRESS (result, ref); | |
45 | } | |
46 | ||
47 | return value; | |
48 | } |