mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-04 10:50:07 +00:00
60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
|
/* ELF symbol resolve functions for VDSO objects.
|
||
|
|
Copyright (C) 2005 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, write to the Free
|
||
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||
|
|
02111-1307 USA. */
|
||
|
|
|
||
|
|
#include "config.h"
|
||
|
|
#include <dl-hash.h>
|
||
|
|
#include <ldsodefs.h>
|
||
|
|
|
||
|
|
|
||
|
|
void *
|
||
|
|
internal_function
|
||
|
|
_dl_vdso_vsym (const char *name, const char *version)
|
||
|
|
{
|
||
|
|
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));
|
||
|
|
|
||
|
|
/* Compute hash value to the version string. */
|
||
|
|
struct r_found_version vers;
|
||
|
|
vers.name = version;
|
||
|
|
vers.hidden = 1;
|
||
|
|
vers.hash = _dl_elf_hash (version);
|
||
|
|
/* We don't have a specific file where the symbol can be found. */
|
||
|
|
vers.filename = NULL;
|
||
|
|
|
||
|
|
/* 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;
|
||
|
|
}
|