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Fix MPX tests on systems with MPX disabled

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I have a Skylake system with MPX in the CPU, but MPX is disabled
in the kernel configuration.

This makes all the MPX tests fail because they assume if MPX
is in CPUID it works

Check the output of XGETBV too to detect non MPX kernels.

gcc/testsuite/:

2016-07-05  Andi Kleen  <ak@linux.intel.com>

	* gcc.target/i386/mpx/mpx-check.h: Check XGETBV output
	if kernel supports MPX.

From-SVN: r238031
This commit is contained in:
Andi Kleen 2016-07-06 02:38:49 +00:00 committed by Andi Kleen
parent 8217ad204f
commit 8070763a2c
2 changed files with 16 additions and 1 deletions
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5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2016-07-05 Andi Kleen <ak@linux.intel.com>
* gcc.target/i386/mpx/mpx-check.h: Check XGETBV output
if kernel supports MPX.
2016-07-05 Kito Cheng <kito.cheng@gmail.com>
* gcc.c-torture/compile/pr69102.c: Require fpic support.

12
gcc/testsuite/gcc.target/i386/mpx/mpx-check.h
View File

@ -16,6 +16,16 @@ mpx_test (int, const char **);
#define DEBUG
#define XSTATE_BNDREGS (1 << 3)
/* This should be an intrinsic, but isn't. */
static int xgetbv (unsigned x)
{
unsigned eax, edx;
asm ("xgetbv" : "=a" (eax), "=d" (edx) : "c" (x));
return eax;
}
int
main (int argc, const char **argv)
{
@ -27,7 +37,7 @@ main (int argc, const char **argv)
__cpuid_count (7, 0, eax, ebx, ecx, edx);
/* Run MPX test only if host has MPX support. */
if (ebx & bit_MPX)
if ((ebx & bit_MPX) && (xgetbv (0) & XSTATE_BNDREGS))
mpx_test (argc, argv);
else
{