67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/* Copyright (C) 2015-2017 Free Software Foundation, Inc.
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Contributed by Intel Corp. <walfred.tedeschi@intel.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "x86-cpuid.h"
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#include <stdio.h>
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#define OUR_SIZE 5
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unsigned int
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have_mpx (void)
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{
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unsigned int eax, ebx, ecx, edx;
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if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
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return 0;
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if ((ecx & bit_OSXSAVE) == bit_OSXSAVE)
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{
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if (__get_cpuid_max (0, NULL) < 7)
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return 0;
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__cpuid_count (7, 0, eax, ebx, ecx, edx);
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if ((ebx & bit_MPX) == bit_MPX)
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return 1;
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else
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return 0;
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}
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return 0;
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}
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void
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upper (int * p, int len)
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{
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int value;
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len++; /* b0-size-test. */
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value = *(p + len);
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}
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int
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main (void)
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{
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if (have_mpx ())
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{
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int a = 0; /* Dummy variable for debugging purposes. */
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int sx[OUR_SIZE];
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a++; /* register-eval. */
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upper (sx, OUR_SIZE + 2);
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return sx[1];
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}
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return 0;
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}
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