projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 8c2e201b | 1 | /* ELF symbol resolve functions for VDSO objects. |
| 26420023 | 2 | Copyright (C) 2005-2025 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 | #ifndef _DL_VDSO_H | |
| 20 | #define _DL_VDSO_H 1 | |
| 21 | ||
| fb86328a | 22 | #include <ldsodefs.h> |
| a6a056bb | 23 | #include <dl-hash.h> |
| fb86328a | 24 | |
| b8a7c7da AZ |
25 | /* If the architecture support vDSO it should define which is the expected |
| 26 | kernel version and hash value through both VDSO_NAME and VDSO_HASH | |
| 27 | (usually defined at architecture sysdep.h). */ | |
| 28 | ||
| 29 | #ifndef VDSO_NAME | |
| 30 | # define VDSO_NAME "LINUX_0.0" | |
| 31 | #endif | |
| 32 | #ifndef VDSO_HASH | |
| 33 | # define VDSO_HASH 0 | |
| 34 | #endif | |
| 35 | ||
| 1bdda52f | 36 | /* Functions for resolving symbols in the VDSO link map. */ |
| b8386c28 | 37 | static inline void * |
| 1bdda52f | 38 | dl_vdso_vsym (const char *name) |
| b8386c28 | 39 | { |
| 1bdda52f AZ |
40 | struct link_map *map = GLRO (dl_sysinfo_map); |
| 41 | if (map == NULL) | |
| 42 | return NULL; | |
| 43 | ||
| 44 | /* Use a WEAK REF so we don't error out if the symbol is not found. */ | |
| 45 | ElfW (Sym) wsym = { 0 }; | |
| 46 | wsym.st_info = (unsigned char) ELFW (ST_INFO (STB_WEAK, STT_NOTYPE)); | |
| 47 | ||
| 30afd8c4 | 48 | const struct r_found_version rfv = { VDSO_NAME, VDSO_HASH, 1, NULL }; |
| b8386c28 | 49 | |
| 1bdda52f AZ |
50 | /* Search the scope of the vdso map. */ |
| 51 | const ElfW (Sym) *ref = &wsym; | |
| 52 | lookup_t result = GLRO (dl_lookup_symbol_x) (name, map, &ref, | |
| 53 | map->l_local_scope, | |
| 54 | &rfv, 0, 0, NULL); | |
| 55 | return ref != NULL ? DL_SYMBOL_ADDRESS (result, ref) : NULL; | |
| b8a7c7da AZ |
56 | } |
| 57 | ||
| 8c2e201b | 58 | #endif /* dl-vdso.h */ |