sysdeps/unix/sysv/linux/x86_64/init-first.c

   1 /* Initialization code run first thing by the ELF startup code.  Linux/x86-64.
   2    Copyright (C) 2007-2019 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 #include <time.h>
  20 #include <sysdep.h>
  21 #include <dl-vdso.h>
  22 #include <libc-vdso.h>
  23
  24 long int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *)
  25   attribute_hidden;
  26 long int (*VDSO_SYMBOL(getcpu)) (unsigned *, unsigned *, void *)
  27   attribute_hidden;
  28
  29 extern __typeof (clock_gettime) __syscall_clock_gettime attribute_hidden;
  30
  31
  32 static inline void
  33 __vdso_platform_setup (void)
  34 {
  35   void *p = get_vdso_symbol ("__vdso_clock_gettime");
  36   if (p == NULL)
  37     p = __syscall_clock_gettime;
  38   PTR_MANGLE (p);
  39   VDSO_SYMBOL(clock_gettime) = p;
  40
  41   p = get_vdso_symbol ("__vdso_getcpu");
  42   PTR_MANGLE (p);
  43   VDSO_SYMBOL(getcpu) = p;
  44 }
  45
  46 #define VDSO_SETUP __vdso_platform_setup
  47
  48 #include <csu/init-first.c>