sysdeps/unix/sysv/linux/x86/cpu-features.c

   1 /* Initialize CPU feature data for Linux/x86.
   2    This file is part of the GNU C Library.
   3    Copyright (C) 2018-2019 Free Software Foundation, Inc.
   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 #if CET_ENABLED
  20 # include <sys/prctl.h>
  21 # include <asm/prctl.h>
  22
  23 static inline int __attribute__ ((always_inline))
  24 get_cet_status (void)
  25 {
  26   unsigned long long cet_status[3];
  27   INTERNAL_SYSCALL_DECL (err);
  28   if (INTERNAL_SYSCALL (arch_prctl, err, 2, ARCH_CET_STATUS,
  29                         cet_status) == 0)
  30     return cet_status[0];
  31   return 0;
  32 }
  33
  34 # ifndef SHARED
  35 static inline void
  36 x86_setup_tls (void)
  37 {
  38   __libc_setup_tls ();
  39   THREAD_SETMEM (THREAD_SELF, header.feature_1, GL(dl_x86_feature_1)[0]);
  40 }
  41
  42 #  define ARCH_SETUP_TLS() x86_setup_tls ()
  43 # endif
  44 #endif
  45
  46 #include <sysdeps/x86/cpu-features.c>