sysdeps/unix/sysv/linux/s390/init-first.c

   1 /* Initialization code run first thing by the ELF startup code.  Linux/s390.
   2    Copyright (C) 2008-2019 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifdef SHARED
  20 # include <dl-vdso.h>
  21 # include <libc-vdso.h>
  22
  23 long int (*VDSO_SYMBOL(gettimeofday)) (struct timeval *, void *)
  24    attribute_hidden;
  25
  26 long int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *)
  27   __attribute__ ((nocommon));
  28
  29 long int (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *)
  30   __attribute__ ((nocommon));
  31
  32 long int (*VDSO_SYMBOL(getcpu)) (unsigned *, unsigned *, void *)
  33    attribute_hidden;
  34
  35 static inline void
  36 _libc_vdso_platform_setup (void)
  37 {
  38   PREPARE_VERSION_KNOWN (linux2629, LINUX_2_6_29);
  39
  40   void *p = _dl_vdso_vsym ("__kernel_gettimeofday", &linux2629);
  41   PTR_MANGLE (p);
  42   VDSO_SYMBOL (gettimeofday) = p;
  43
  44   p = _dl_vdso_vsym ("__kernel_clock_gettime", &linux2629);
  45   PTR_MANGLE (p);
  46   VDSO_SYMBOL (clock_gettime) = p;
  47
  48   p = _dl_vdso_vsym ("__kernel_clock_getres", &linux2629);
  49   PTR_MANGLE (p);
  50   VDSO_SYMBOL (clock_getres) = p;
  51
  52   p = _dl_vdso_vsym ("__kernel_getcpu", &linux2629);
  53   PTR_MANGLE (p);
  54   VDSO_SYMBOL (getcpu) = p;
  55 }
  56
  57 # define VDSO_SETUP _libc_vdso_platform_setup
  58 #endif
  59
  60 #include <csu/init-first.c>