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

/* Test program for MPX registers.

   Copyright 2013-2020 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include <stdio.h>
#include "x86-cpuid.h"

#ifndef NOINLINE
#define NOINLINE __attribute__ ((noinline))
#endif

unsigned int have_mpx (void) NOINLINE;

unsigned int NOINLINE
have_mpx (void)
{
  unsigned int eax, ebx, ecx, edx;

  if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
    return 0;

  if ((ecx & bit_OSXSAVE) == bit_OSXSAVE)
    {
      if (__get_cpuid_max (0, NULL) < 7)
	return 0;

      __cpuid_count (7, 0, eax, ebx, ecx, edx);

      if ((ebx & bit_MPX) == bit_MPX)
	return 1;
      else
	return 0;
    }
  return 0;
}

int
main (int argc, char **argv)
{
  if (have_mpx ())
    {
#ifdef __x86_64__
      asm ("mov $10, %rax\n\t"
	  "mov $9, %rdx\n\t"
	  "bndmk (%rax,%rdx), %bnd0\n\t"
	  "mov $20, %rax\n\t"
	  "mov $9, %rdx\n\t"
	  "bndmk (%rax,%rdx), %bnd1\n\t"
	  "mov $30, %rax\n\t"
	  "mov $9, %rdx\n\t"
	  "bndmk (%rax,%rdx), %bnd2\n\t"
	  "mov $40, %rax\n\t"
	  "mov $9, %rdx\n\t"
	  "bndmk (%rax,%rdx), %bnd3\n\t"
	  "bndstx %bnd3, (%rax) \n\t"
	  "nop\n\t"
         );
#else
      asm ("mov $10, %eax\n\t"
	   "mov $9, %edx\n\t"
	   "bndmk (%eax,%edx), %bnd0\n\t"
	   "mov $20, %eax\n\t"
	   "mov $9, %edx\n\t"
	   "bndmk (%eax,%edx), %bnd1\n\t"
	   "mov $30, %eax\n\t"
	   "mov $9, %edx\n\t"
	   "bndmk (%eax,%edx), %bnd2\n\t"
	   "mov $40, %eax\n\t"
	   "mov $9, %edx\n\t"
	   "bndmk (%eax,%edx), %bnd3\n\t"
	   "bndstx  %bnd3, (%eax)\n\t"
	   "nop\n\t"
	  );
#endif
	asm ("nop\n\t");	/* break here.  */
    }
  return 0;
}