sysdeps/unix/sysv/linux/aarch64/init-first.c

   1 /* Copyright (C) 2007-2019 Free Software Foundation, Inc.
   2
   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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <dl-vdso.h>
  20 #include <libc-vdso.h>
  21
  22 int (*VDSO_SYMBOL(gettimeofday)) (struct timeval *, void *) attribute_hidden;
  23 int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *);
  24 int (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *);
  25
  26 static inline void
  27 _libc_vdso_platform_setup (void)
  28 {
  29 #ifdef __LP64__
  30   PREPARE_VERSION_KNOWN (linux_version, LINUX_2_6_39);
  31 #else
  32   PREPARE_VERSION_KNOWN (linux_version, LINUX_4_9);
  33 #endif
  34
  35   void *p = _dl_vdso_vsym ("__kernel_gettimeofday", &linux_version);
  36   PTR_MANGLE (p);
  37   VDSO_SYMBOL(gettimeofday) = p;
  38
  39   p = _dl_vdso_vsym ("__kernel_clock_gettime", &linux_version);
  40   PTR_MANGLE (p);
  41   VDSO_SYMBOL(clock_gettime) = p;
  42
  43   p = _dl_vdso_vsym ("__kernel_clock_getres", &linux_version);
  44   PTR_MANGLE (p);
  45   VDSO_SYMBOL(clock_getres) = p;
  46 }
  47
  48 #define VDSO_SETUP _libc_vdso_platform_setup
  49
  50 #include <csu/init-first.c>