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

   1 /* ELF symbol resolve functions for VDSO objects.
   2    Copyright (C) 2005-2019 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    <https://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 static inline struct r_found_version
  28 prepare_version_base (const char *name, ElfW(Word) hash)
  29 {
  30   assert (hash == _dl_elf_hash (name));
  31   return (struct r_found_version) { name, hash, 1, NULL };
  32 }
  33 #define prepare_version(vname) \
  34   prepare_version_base (VDSO_NAME_##vname, VDSO_HASH_##vname)
  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   struct r_found_version var = prepare_version (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_2_6_39  "LINUX_2.6.39"
  48 #define VDSO_HASH_LINUX_2_6_39  123718537
  49 #define VDSO_NAME_LINUX_4       "LINUX_4"
  50 #define VDSO_HASH_LINUX_4       14921332
  51 #define VDSO_NAME_LINUX_4_9     "LINUX_4.9"
  52 #define VDSO_HASH_LINUX_4_9     61765625
  53 #define VDSO_NAME_LINUX_4_15    "LINUX_4.15"
  54 #define VDSO_HASH_LINUX_4_15    182943605
  55
  56 /* Functions for resolving symbols in the VDSO link map.  */
  57 extern void *_dl_vdso_vsym (const char *name,
  58                             const struct r_found_version *version)
  59       attribute_hidden;
  60
  61 #endif /* dl-vdso.h */