| /* ELF symbol resolve functions for VDSO objects. |
| Copyright (C) 2005-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "config.h" |
| #include <ldsodefs.h> |
| |
| |
| void * |
| _dl_vdso_vsym (const char *name, const struct r_found_version *vers) |
| { |
| struct link_map *map = GLRO (dl_sysinfo_map); |
| void *value = NULL; |
| |
| |
| if (map != NULL) |
| { |
| /* Use a WEAK REF so we don't error out if the symbol is not found. */ |
| ElfW (Sym) wsym; |
| memset (&wsym, 0, sizeof (ElfW (Sym))); |
| wsym.st_info = (unsigned char) ELFW (ST_INFO (STB_WEAK, STT_NOTYPE)); |
| |
| /* Search the scope of the vdso map. */ |
| const ElfW (Sym) *ref = &wsym; |
| lookup_t result = GLRO (dl_lookup_symbol_x) (name, map, &ref, |
| map->l_local_scope, |
| vers, 0, 0, NULL); |
| |
| if (ref != NULL) |
| value = DL_SYMBOL_ADDRESS (result, ref); |
| } |
| |
| return value; |
| } |