1  /* Test CET property note parser.
       2     Copyright (C) 2018-2023 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 <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>