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

   1 /* ELF symbol resolve functions for VDSO objects.
   2    Copyright (C) 2005-2018 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 #include <dl-hash.h>
  25
  26 /* Create version number record for lookup.  */
  27 #define PREPARE_VERSION(var, vname, vhash) \
  28   struct r_found_version var;                                                 \
  29   var.name = vname;                                                           \
  30   var.hidden = 1;                                                             \
  31   var.hash = vhash;                                                           \
  32   assert (var.hash == _dl_elf_hash (var.name));                               \
  33   /* We don't have a specific file where the symbol can be found.  */         \
  34   var.filename = NULL
  35
  36 /* Use this for the known version sets defined below, where we
  37    record their precomputed hash values only once, in this file.  */
  38 #define PREPARE_VERSION_KNOWN(var, vname) \
  39   PREPARE_VERSION (var, VDSO_NAME_##vname, VDSO_HASH_##vname)
  40
  41 #define VDSO_NAME_LINUX_2_6     "LINUX_2.6"
  42 #define VDSO_HASH_LINUX_2_6     61765110
  43 #define VDSO_NAME_LINUX_2_6_15  "LINUX_2.6.15"
  44 #define VDSO_HASH_LINUX_2_6_15  123718565
  45 #define VDSO_NAME_LINUX_2_6_29  "LINUX_2.6.29"
  46 #define VDSO_HASH_LINUX_2_6_29  123718585
  47 #define VDSO_NAME_LINUX_4_15    "LINUX_4.15"
  48 #define VDSO_HASH_LINUX_4_15    182943605
  49
  50 /* Functions for resolving symbols in the VDSO link map.  */
  51 extern void *_dl_vdso_vsym (const char *name,
  52                             const struct r_found_version *version)
  53       attribute_hidden;
  54
  55 #endif /* dl-vdso.h */