diff mbox series

[v2,11/11] kselftest/arm64: add MOPS to hwcap test

Message ID 20230509142235.3284028-12-kristina.martsenko@arm.com
State New
Headers
Series arm64: Support for Armv8.8 memcpy instructions in userspace |

Commit Message

Kristina Martsenko May 9, 2023, 2:22 p.m. UTC 
  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

Mark Brown May 12, 2023, 4:02 a.m. UTC | #1 
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.
diff mbox series

Patch

diff --git a/tools/testing/selftests/arm64/abi/hwcap.c b/tools/testing/selftests/arm64/abi/hwcap.c
index 93333a90bf3a..d4ad813fed10 100644
--- a/tools/testing/selftests/arm64/abi/hwcap.c
+++ b/tools/testing/selftests/arm64/abi/hwcap.c
@@ -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,