sysdeps/unix/sysv/linux/x86/tst-cet-property-1.c

   1 /* Test CET property note parser.
   2    Copyright (C) 2018-2019 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 #include <stdio.h>
  20 #include <elf.h>
  21 #include <tcb-offsets.h>
  22
  23 /* This test prints out "IBT" if Intel indirect branch tracking (IBT)
  24    is enabled at run-time, which is checked by tst-cet-property-2 to
  25    verify that the IBT violation is caught on IBT machines.  */
  26
  27 static int
  28 do_test (void)
  29 {
  30   unsigned int feature_1;
  31 #ifdef __x86_64__
  32 # define SEG_REG "fs"
  33 #else
  34 # define SEG_REG "gs"
  35 #endif
  36   asm ("movl %%" SEG_REG ":%P1, %0"
  37        : "=r" (feature_1) : "i" (FEATURE_1_OFFSET));
  38   if ((feature_1 & GNU_PROPERTY_X86_FEATURE_1_IBT) != 0)
  39     printf ("IBT\n");
  40
  41   return 0;
  42 }
  43
  44 #include <support/test-driver.c>