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//===-- main.cpp ------------------------------------------------*- C++ -*-===//
////
//// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
//// See https://llvm.org/LICENSE.txt for license information.
//// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
////
////===----------------------------------------------------------------------===//
//
#include <cpuid.h>
#include <cstddef>
int
main(int argc, char const *argv[])
{
// PR_MPX_ENABLE_MANAGEMENT won't be defined on linux kernel versions below 3.19
#ifndef PR_MPX_ENABLE_MANAGEMENT
return -1;
#endif
// This call returns 0 only if the CPU and the kernel support Intel(R) MPX.
if (prctl(PR_MPX_ENABLE_MANAGEMENT, 0, 0, 0, 0) != 0)
return -1;
// Run Intel(R) MPX test code.
#if defined(__x86_64__)
asm("mov $16, %rax\n\t"
"mov $9, %rdx\n\t"
"bndmk (%rax,%rdx), %bnd0\n\t"
"mov $32, %rax\n\t"
"mov $9, %rdx\n\t"
"bndmk (%rax,%rdx), %bnd1\n\t"
"mov $48, %rax\n\t"
"mov $9, %rdx\n\t"
"bndmk (%rax,%rdx), %bnd2\n\t"
"mov $64, %rax\n\t"
"mov $9, %rdx\n\t"
"bndmk (%rax,%rdx), %bnd3\n\t"
"bndstx %bnd3, (%rax) \n\t"
"nop\n\t");
#endif
#if defined(__i386__)
asm("mov $16, %eax\n\t"
"mov $9, %edx\n\t"
"bndmk (%eax,%edx), %bnd0\n\t"
"mov $32, %eax\n\t"
"mov $9, %edx\n\t"
"bndmk (%eax,%edx), %bnd1\n\t"
"mov $48, %eax\n\t"
"mov $9, %edx\n\t"
"bndmk (%eax,%edx), %bnd2\n\t"
"mov $64, %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"); // Set a break point here.
return 0;
}
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