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

   1 /* RISC-V VDSO initialization
   2    Copyright (C) 2017-2019 Free Software Foundation, Inc.
   3
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public License as
   8    published by the Free Software Foundation; either version 2.1 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifdef SHARED
  21 # include <dl-vdso.h>
  22 # include <libc-vdso.h>
  23
  24 long int (*VDSO_SYMBOL (getcpu)) (unsigned int *, unsigned int *, void *)
  25     attribute_hidden;
  26 long int (*VDSO_SYMBOL (gettimeofday)) (struct timeval *, void *)
  27     attribute_hidden;
  28 long int (*VDSO_SYMBOL (clock_gettime)) (clockid_t, struct timespec *)
  29     attribute_hidden;
  30 long int (*VDSO_SYMBOL (clock_getres)) (clockid_t, struct timespec *)
  31     attribute_hidden;
  32
  33 static inline void
  34 _libc_vdso_platform_setup (void)
  35 {
  36   PREPARE_VERSION_KNOWN (linux_version, LINUX_4_15);
  37
  38   void *p = _dl_vdso_vsym ("__vdso_getcpu", &linux_version);
  39   PTR_MANGLE (p);
  40   VDSO_SYMBOL (getcpu) = p;
  41
  42   p = _dl_vdso_vsym ("__vdso_gettimeofday", &linux_version);
  43   PTR_MANGLE (p);
  44   VDSO_SYMBOL (gettimeofday) = p;
  45
  46   p = _dl_vdso_vsym ("__vdso_clock_gettime", &linux_version);
  47   PTR_MANGLE (p);
  48   VDSO_SYMBOL (clock_gettime) = p;
  49
  50   p = _dl_vdso_vsym ("__vdso_clock_getres", &linux_version);
  51   PTR_MANGLE (p);
  52   VDSO_SYMBOL (clock_getres) = p;
  53 }
  54
  55 # define VDSO_SETUP _libc_vdso_platform_setup
  56 #endif
  57
  58 #include <csu/init-first.c>