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/* Copyright (C) 2015-2020 Free Software Foundation, Inc.
Contributed by Intel Corp. <walfred.tedeschi@intel.com>
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 "x86-cpuid.h"
#include <stdio.h>
#define OUR_SIZE 5
unsigned int
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;
}
void
upper (int * p, int len)
{
int value;
len++; /* b0-size-test. */
value = *(p + len);
}
int
main (void)
{
if (have_mpx ())
{
int a = 0; /* Dummy variable for debugging purposes. */
int sx[OUR_SIZE];
a++; /* register-eval. */
upper (sx, OUR_SIZE + 2);
return sx[1];
}
return 0;
}
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