sysdeps/unix/sysv/linux/init-first.c

   1 /* vDSO internal symbols.  Linux generic version.
   2    Copyright (C) 2019-2020 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 License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    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 #include <dl-vdso.h>
  20 #include <libc-vdso.h>
  21
  22 /* vDSO symbol used on clock_gettime implementation.  */
  23 #ifdef HAVE_CLOCK_GETTIME_VSYSCALL
  24 int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *)
  25   attribute_hidden;
  26 #endif
  27 /* vDSO symbol used on clock_gettime64 implementation.  */
  28 #ifdef HAVE_CLOCK_GETTIME64_VSYSCALL
  29 int (*VDSO_SYMBOL(clock_gettime64)) (clockid_t, struct __timespec64 *)
  30   attribute_hidden;
  31 #endif
  32 /* vDSO symbol used on clock_getres implementation.  */
  33 #ifdef HAVE_CLOCK_GETRES_VSYSCALL
  34 int (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *)
  35   attribute_hidden;
  36 #endif
  37 /* vDSO symbol used on gettimeofday implementation.  */
  38 #ifdef HAVE_GETTIMEOFDAY_VSYSCALL
  39 int (*VDSO_SYMBOL (gettimeofday)) (struct timeval *, void *)
  40   attribute_hidden;
  41 #endif
  42 /* vDSO symbol used on GNU extension getcpu implementation.  */
  43 #ifdef HAVE_GETCPU_VSYSCALL
  44 long int (*VDSO_SYMBOL(getcpu)) (unsigned *, unsigned *, void *)
  45    attribute_hidden;
  46 #endif
  47 /* vDSO symbol used on time implementation.  */
  48 #ifdef HAVE_TIME_VSYSCALL
  49 time_t (*VDSO_SYMBOL(time)) (time_t *) attribute_hidden;
  50 #endif
  51
  52 static inline void
  53 __libc_vdso_platform_setup (void)
  54 {
  55 #ifdef HAVE_CLOCK_GETTIME_VSYSCALL
  56   VDSO_SYMBOL(clock_gettime)
  57     = get_vdso_mangle_symbol (HAVE_CLOCK_GETTIME_VSYSCALL);
  58 #endif
  59
  60 #ifdef HAVE_CLOCK_GETTIME64_VSYSCALL
  61   VDSO_SYMBOL(clock_gettime64)
  62     = get_vdso_mangle_symbol (HAVE_CLOCK_GETTIME64_VSYSCALL);
  63 #endif
  64
  65 #ifdef HAVE_CLOCK_GETRES_VSYSCALL
  66   VDSO_SYMBOL(clock_getres)
  67     = get_vdso_mangle_symbol (HAVE_CLOCK_GETRES_VSYSCALL);
  68 #endif
  69
  70 #ifdef HAVE_GETTIMEOFDAY_VSYSCALL
  71   VDSO_SYMBOL(gettimeofday)
  72     = get_vdso_mangle_symbol (HAVE_GETTIMEOFDAY_VSYSCALL);
  73 #endif
  74
  75 #ifdef HAVE_GETCPU_VSYSCALL
  76   VDSO_SYMBOL(getcpu) = get_vdso_mangle_symbol (HAVE_GETCPU_VSYSCALL);
  77 #endif
  78
  79 #ifdef HAVE_TIME_VSYSCALL
  80   VDSO_SYMBOL(time) = get_vdso_mangle_symbol (HAVE_TIME_VSYSCALL);
  81 #endif
  82
  83 #ifdef VDSO_SETUP_ARCH
  84   VDSO_SETUP_ARCH ();
  85 #endif
  86 }
  87
  88 #define VDSO_SETUP __libc_vdso_platform_setup
  89
  90 #include <csu/init-first.c>