blob: 892bf56193701e1f132e12fe69647cb0e9b82f2d [file] [log] [blame] [edit]
#include "libcflat.h"
#include "desc.h"
#include "processor.h"
#ifdef __x86_64__
#define uint64_t unsigned long
#else
#define uint64_t unsigned long long
#endif
static int xgetbv_checking(u32 index, u64 *result)
{
u32 eax, edx;
asm volatile(ASM_TRY("1f")
".byte 0x0f,0x01,0xd0\n\t" /* xgetbv */
"1:"
: "=a" (eax), "=d" (edx)
: "c" (index));
*result = eax + ((u64)edx << 32);
return exception_vector();
}
static int xsetbv_checking(u32 index, u64 value)
{
u32 eax = value;
u32 edx = value >> 32;
asm volatile(ASM_TRY("1f")
".byte 0x0f,0x01,0xd1\n\t" /* xsetbv */
"1:"
: : "a" (eax), "d" (edx), "c" (index));
return exception_vector();
}
static uint64_t get_supported_xcr0(void)
{
struct cpuid r;
r = cpuid_indexed(0xd, 0);
printf("eax %x, ebx %x, ecx %x, edx %x\n",
r.a, r.b, r.c, r.d);
return r.a + ((u64)r.d << 32);
}
#define X86_CR4_OSXSAVE 0x00040000
#define XCR_XFEATURE_ENABLED_MASK 0x00000000
#define XCR_XFEATURE_ILLEGAL_MASK 0x00000010
#define XSTATE_FP 0x1
#define XSTATE_SSE 0x2
#define XSTATE_YMM 0x4
static void test_xsave(void)
{
unsigned long cr4;
uint64_t supported_xcr0;
uint64_t test_bits;
u64 xcr0;
printf("Legal instruction testing:\n");
supported_xcr0 = get_supported_xcr0();
printf("Supported XCR0 bits: %#lx\n", supported_xcr0);
test_bits = XSTATE_FP | XSTATE_SSE;
report((supported_xcr0 & test_bits) == test_bits,
"Check minimal XSAVE required bits");
cr4 = read_cr4();
report(write_cr4_checking(cr4 | X86_CR4_OSXSAVE) == 0, "Set CR4 OSXSAVE");
report(this_cpu_has(X86_FEATURE_OSXSAVE),
"Check CPUID.1.ECX.OSXSAVE - expect 1");
printf("\tLegal tests\n");
test_bits = XSTATE_FP;
report(xsetbv_checking(XCR_XFEATURE_ENABLED_MASK, test_bits) == 0,
"\t\txsetbv(XCR_XFEATURE_ENABLED_MASK, XSTATE_FP)");
test_bits = XSTATE_FP | XSTATE_SSE;
report(xsetbv_checking(XCR_XFEATURE_ENABLED_MASK, test_bits) == 0,
"\t\txsetbv(XCR_XFEATURE_ENABLED_MASK, XSTATE_FP | XSTATE_SSE)");
report(xgetbv_checking(XCR_XFEATURE_ENABLED_MASK, &xcr0) == 0,
" xgetbv(XCR_XFEATURE_ENABLED_MASK)");
printf("\tIllegal tests\n");
test_bits = 0;
report(xsetbv_checking(XCR_XFEATURE_ENABLED_MASK, test_bits) == GP_VECTOR,
"\t\txsetbv(XCR_XFEATURE_ENABLED_MASK, 0) - expect #GP");
test_bits = XSTATE_SSE;
report(xsetbv_checking(XCR_XFEATURE_ENABLED_MASK, test_bits) == GP_VECTOR,
"\t\txsetbv(XCR_XFEATURE_ENABLED_MASK, XSTATE_SSE) - expect #GP");
if (supported_xcr0 & XSTATE_YMM) {
test_bits = XSTATE_YMM;
report(xsetbv_checking(XCR_XFEATURE_ENABLED_MASK, test_bits) == GP_VECTOR,
"\t\txsetbv(XCR_XFEATURE_ENABLED_MASK, XSTATE_YMM) - expect #GP");
test_bits = XSTATE_FP | XSTATE_YMM;
report(xsetbv_checking(XCR_XFEATURE_ENABLED_MASK, test_bits) == GP_VECTOR,
"\t\txsetbv(XCR_XFEATURE_ENABLED_MASK, XSTATE_FP | XSTATE_YMM) - expect #GP");
}
test_bits = XSTATE_SSE;
report(xsetbv_checking(XCR_XFEATURE_ILLEGAL_MASK, test_bits) == GP_VECTOR,
"\t\txsetbv(XCR_XFEATURE_ILLEGAL_MASK, XSTATE_FP) - expect #GP");
test_bits = XSTATE_SSE;
report(xsetbv_checking(XCR_XFEATURE_ILLEGAL_MASK, test_bits) == GP_VECTOR,
"\t\txgetbv(XCR_XFEATURE_ILLEGAL_MASK, XSTATE_FP) - expect #GP");
cr4 &= ~X86_CR4_OSXSAVE;
report(write_cr4_checking(cr4) == 0, "Unset CR4 OSXSAVE");
report(this_cpu_has(X86_FEATURE_OSXSAVE) == 0,
"Check CPUID.1.ECX.OSXSAVE - expect 0");
printf("\tIllegal tests:\n");
test_bits = XSTATE_FP;
report(xsetbv_checking(XCR_XFEATURE_ENABLED_MASK, test_bits) == UD_VECTOR,
"\t\txsetbv(XCR_XFEATURE_ENABLED_MASK, XSTATE_FP) - expect #UD");
test_bits = XSTATE_FP | XSTATE_SSE;
report(xsetbv_checking(XCR_XFEATURE_ENABLED_MASK, test_bits) == UD_VECTOR,
"\t\txsetbv(XCR_XFEATURE_ENABLED_MASK, XSTATE_FP | XSTATE_SSE) - expect #UD");
printf("\tIllegal tests:\n");
report(xgetbv_checking(XCR_XFEATURE_ENABLED_MASK, &xcr0) == UD_VECTOR,
"\txgetbv(XCR_XFEATURE_ENABLED_MASK) - expect #UD");
}
static void test_no_xsave(void)
{
unsigned long cr4;
u64 xcr0;
report(this_cpu_has(X86_FEATURE_OSXSAVE) == 0,
"Check CPUID.1.ECX.OSXSAVE - expect 0");
printf("Illegal instruction testing:\n");
cr4 = read_cr4();
report(write_cr4_checking(cr4 | X86_CR4_OSXSAVE) == GP_VECTOR,
"Set OSXSAVE in CR4 - expect #GP");
report(xgetbv_checking(XCR_XFEATURE_ENABLED_MASK, &xcr0) == UD_VECTOR,
"Execute xgetbv - expect #UD");
report(xsetbv_checking(XCR_XFEATURE_ENABLED_MASK, 0x3) == UD_VECTOR,
"Execute xsetbv - expect #UD");
}
int main(void)
{
if (this_cpu_has(X86_FEATURE_XSAVE)) {
printf("CPU has XSAVE feature\n");
test_xsave();
} else {
printf("CPU don't has XSAVE feature\n");
test_no_xsave();
}
return report_summary();
}