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

   1 /* Test program for MPX registers.
   2
   3    Copyright 2013-2019 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include <stdio.h>
  21 #include "x86-cpuid.h"
  22
  23 #ifndef NOINLINE
  24 #define NOINLINE __attribute__ ((noinline))
  25 #endif
  26
  27 unsigned int have_mpx (void) NOINLINE;
  28
  29 unsigned int NOINLINE
  30 have_mpx (void)
  31 {
  32   unsigned int eax, ebx, ecx, edx;
  33
  34   if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
  35     return 0;
  36
  37   if ((ecx & bit_OSXSAVE) == bit_OSXSAVE)
  38     {
  39       if (__get_cpuid_max (0, NULL) < 7)
  40         return 0;
  41
  42       __cpuid_count (7, 0, eax, ebx, ecx, edx);
  43
  44       if ((ebx & bit_MPX) == bit_MPX)
  45         return 1;
  46       else
  47         return 0;
  48     }
  49   return 0;
  50 }
  51
  52 int
  53 main (int argc, char **argv)
  54 {
  55   if (have_mpx ())
  56     {
  57 #ifdef __x86_64__
  58       asm ("mov $10, %rax\n\t"
  59           "mov $9, %rdx\n\t"
  60           "bndmk (%rax,%rdx), %bnd0\n\t"
  61           "mov $20, %rax\n\t"
  62           "mov $9, %rdx\n\t"
  63           "bndmk (%rax,%rdx), %bnd1\n\t"
  64           "mov $30, %rax\n\t"
  65           "mov $9, %rdx\n\t"
  66           "bndmk (%rax,%rdx), %bnd2\n\t"
  67           "mov $40, %rax\n\t"
  68           "mov $9, %rdx\n\t"
  69           "bndmk (%rax,%rdx), %bnd3\n\t"
  70           "bndstx %bnd3, (%rax) \n\t"
  71           "nop\n\t"
  72          );
  73 #else
  74       asm ("mov $10, %eax\n\t"
  75            "mov $9, %edx\n\t"
  76            "bndmk (%eax,%edx), %bnd0\n\t"
  77            "mov $20, %eax\n\t"
  78            "mov $9, %edx\n\t"
  79            "bndmk (%eax,%edx), %bnd1\n\t"
  80            "mov $30, %eax\n\t"
  81            "mov $9, %edx\n\t"
  82            "bndmk (%eax,%edx), %bnd2\n\t"
  83            "mov $40, %eax\n\t"
  84            "mov $9, %edx\n\t"
  85            "bndmk (%eax,%edx), %bnd3\n\t"
  86            "bndstx  %bnd3, (%eax)\n\t"
  87            "nop\n\t"
  88           );
  89 #endif
  90         asm ("nop\n\t");        /* break here.  */
  91     }
  92   return 0;
  93 }