Validate the RNG hwcap and make sure we don't generate a SIGILL reading
RNDR when it is reported.
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
tools/testing/selftests/arm64/abi/hwcap.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/tools/testing/selftests/arm64/abi/hwcap.c b/tools/testing/selftests/arm64/abi/hwcap.c
index 6c91b4a0987e..d173e41f2123 100644
--- a/tools/testing/selftests/arm64/abi/hwcap.c
+++ b/tools/testing/selftests/arm64/abi/hwcap.c
@@ -33,6 +33,11 @@
*/
typedef void (*sigill_fn)(void);
+static void rng_sigill(void)
+{
+ asm volatile("mrs x0, S3_3_C2_C4_0" : : : "x0");
+}
+
static void sme_sigill(void)
{
/* RDSVL x0, #0 */
@@ -113,6 +118,13 @@ static const struct hwcap_data {
sigill_fn sigill_fn;
bool sigill_reliable;
} hwcaps[] = {
+ {
+ .name = "RNG",
+ .at_hwcap = AT_HWCAP2,
+ .hwcap_bit = HWCAP2_RNG,
+ .cpuinfo = "rng",
+ .sigill_fn = rng_sigill,
+ },
{
.name = "SME",
.at_hwcap = AT_HWCAP2,
--
2.30.2
