gdb/testsuite/gdb.arch/i386-mpx-simple_segv.c

   1 /* Copyright (C) 2015-2021 Free Software Foundation, Inc.
   2
   3    Contributed by Intel Corp. <walfred.tedeschi@intel.com>
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include "x86-cpuid.h"
  19 #include <stdio.h>
  20
  21 #define OUR_SIZE    5
  22
  23 unsigned int
  24 have_mpx (void)
  25 {
  26   unsigned int eax, ebx, ecx, edx;
  27
  28   if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
  29     return 0;
  30
  31   if ((ecx & bit_OSXSAVE) == bit_OSXSAVE)
  32     {
  33       if (__get_cpuid_max (0, NULL) < 7)
  34         return 0;
  35
  36       __cpuid_count (7, 0, eax, ebx, ecx, edx);
  37
  38       if ((ebx & bit_MPX) == bit_MPX)
  39         return 1;
  40       else
  41         return 0;
  42     }
  43   return 0;
  44 }
  45
  46 void
  47 upper (int * p, int len)
  48 {
  49   int value;
  50   len++;                        /* b0-size-test.  */
  51   value = *(p + len);
  52 }
  53
  54 int
  55 main (void)
  56 {
  57   if (have_mpx ())
  58     {
  59       int a = 0;                        /* Dummy variable for debugging purposes.  */
  60       int sx[OUR_SIZE];
  61       a++;                              /* register-eval.  */
  62       upper (sx, OUR_SIZE + 2);
  63       return sx[1];
  64     }
  65   return 0;
  66 }