[v2,11/11] kselftest/arm64: add MOPS to hwcap test
Commit Message
Add the MOPS hwcap to the hwcap kselftest and check that a SIGILL is not
generated when the feature is detected. A SIGILL is reliable when the
feature is not detected as SCTLR_EL1.MSCEn won't have been set.
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
---
tools/testing/selftests/arm64/abi/hwcap.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
Comments
On Tue, May 09, 2023 at 03:22:35PM +0100, Kristina Martsenko wrote:
> Add the MOPS hwcap to the hwcap kselftest and check that a SIGILL is not
> generated when the feature is detected. A SIGILL is reliable when the
> feature is not detected as SCTLR_EL1.MSCEn won't have been set.
Reviewed-by: Mark Brown <broonie@kernel.org>
> + /* CPYP [x0]!, [x1]!, x2! */
> + asm volatile(".inst 0x1d010440"
> + : "+r" (dstp), "+r" (srcp), "+r" (size)
> + :
> + : "cc", "memory");
Verified against DDI0602 2023-03.
@@ -39,6 +39,20 @@ static void cssc_sigill(void)
asm volatile(".inst 0xdac01c00" : : : "x0");
}
+static void mops_sigill(void)
+{
+ char dst[1], src[1];
+ register char *dstp asm ("x0") = dst;
+ register char *srcp asm ("x1") = src;
+ register long size asm ("x2") = 1;
+
+ /* CPYP [x0]!, [x1]!, x2! */
+ asm volatile(".inst 0x1d010440"
+ : "+r" (dstp), "+r" (srcp), "+r" (size)
+ :
+ : "cc", "memory");
+}
+
static void rng_sigill(void)
{
asm volatile("mrs x0, S3_3_C2_C4_0" : : : "x0");
@@ -209,6 +223,14 @@ static const struct hwcap_data {
.cpuinfo = "cssc",
.sigill_fn = cssc_sigill,
},
+ {
+ .name = "MOPS",
+ .at_hwcap = AT_HWCAP2,
+ .hwcap_bit = HWCAP2_MOPS,
+ .cpuinfo = "mops",
+ .sigill_fn = mops_sigill,
+ .sigill_reliable = true,
+ },
{
.name = "RNG",
.at_hwcap = AT_HWCAP2,