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91 lines
2.0 KiB
C
91 lines
2.0 KiB
C
/* Test program for PKEYS registers.
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Copyright 2015-2018 Free Software Foundation, Inc.
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This file is part of GDB.
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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 <stddef.h>
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#include "x86-cpuid.h"
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#ifndef NOINLINE
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#define NOINLINE __attribute__ ((noinline))
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#endif
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unsigned int have_pkru (void) NOINLINE;
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static inline unsigned long
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rdpkru (void)
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{
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unsigned int eax, edx;
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unsigned int ecx = 0;
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unsigned int pkru;
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asm volatile (".byte 0x0f,0x01,0xee\n\t"
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: "=a" (eax), "=d" (edx)
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: "c" (ecx));
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pkru = eax;
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return pkru;
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}
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static inline void
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wrpkru (unsigned int pkru)
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{
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unsigned int eax = pkru;
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unsigned int ecx = 0;
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unsigned int edx = 0;
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asm volatile (".byte 0x0f,0x01,0xef\n\t"
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: : "a" (eax), "c" (ecx), "d" (edx));
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}
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unsigned int NOINLINE
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have_pkru (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 ((ecx & bit_PKU) == bit_PKU)
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return 1;
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}
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return 0;
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}
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int
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main (int argc, char **argv)
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{
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unsigned int wr_value = 0x12345678;
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unsigned int rd_value = 0x0;
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if (have_pkru ())
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{
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wrpkru (wr_value);
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asm ("nop\n\t"); /* break here 1. */
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rd_value = rdpkru ();
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asm ("nop\n\t"); /* break here 2. */
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}
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return 0;
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}
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