1 /* Test program for MPX registers. 2 3 Copyright 2013-2016 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 } 94