sysdeps/unix/sysv/linux/dl-vdso.h

   1 /* ELF symbol resolve functions for VDSO objects.
   2    Copyright (C) 2005, 2007 Free Software Foundation, Inc.
   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
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _DL_VDSO_H
  20 #define _DL_VDSO_H      1
  21
  22 #include <assert.h>
  23 #include <ldsodefs.h>
  24
  25 #ifdef NDEBUG
  26 # define CHECK_HASH(var) do {} while (0)
  27 #else
  28 # include <dl-hash.h>
  29 # define CHECK_HASH(var) assert (var.hash == _dl_elf_hash (var.name))
  30 #endif
  31
  32 /* Create version number record for lookup.  */
  33 #define PREPARE_VERSION(var, vname, vhash) \
  34   struct r_found_version var;                                                 \
  35   var.name = vname;                                                           \
  36   var.hidden = 1;                                                             \
  37   var.hash = vhash;                                                           \
  38   CHECK_HASH (var);                                                           \
  39   /* We don't have a specific file where the symbol can be found.  */         \
  40   var.filename = NULL
  41
  42
  43 /* Functions for resolving symbols in the VDSO link map.  */
  44 extern void *_dl_vdso_vsym (const char *name,
  45                             const struct r_found_version *version)
  46      internal_function attribute_hidden;
  47
  48 #endif /* dl-vdso.h */