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60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
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/* ELF symbol resolve functions for VDSO objects.
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include "config.h"
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#include <dl-hash.h>
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#include <ldsodefs.h>
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void *
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internal_function
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_dl_vdso_vsym (const char *name, const char *version)
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{
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struct link_map *map = GLRO (dl_sysinfo_map);
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void *value = NULL;
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if (map != NULL)
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{
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/* Use a WEAK REF so we don't error out if the symbol is not found. */
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ElfW (Sym) wsym;
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memset (&wsym, 0, sizeof (ElfW (Sym)));
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wsym.st_info = (unsigned char) ELFW (ST_INFO (STB_WEAK, STT_NOTYPE));
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/* Compute hash value to the version string. */
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struct r_found_version vers;
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vers.name = version;
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vers.hidden = 1;
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vers.hash = _dl_elf_hash (version);
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/* We don't have a specific file where the symbol can be found. */
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vers.filename = NULL;
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/* Search the scope of the vdso map. */
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const ElfW (Sym) *ref = &wsym;
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lookup_t result = GLRO (dl_lookup_symbol_x) (name, map, &ref,
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map->l_local_scope,
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&vers, 0, 0, NULL);
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if (ref != NULL)
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value = DL_SYMBOL_ADDRESS (result, ref);
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}
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return value;
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}
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