[PATCH v4 2/2] kselftest/arm64: Add lsfe to the hwcaps test

Mark Brown
2025-09-18T19:44:33Z

This feature has no traps associated with it so the SIGILL is not reliable.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
tools/testing/selftests/arm64/abi/hwcap.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/tools/testing/selftests/arm64/abi/hwcap.c b/tools/testing/selftests/arm64/abi/hwcap.c
index 002ec38a8bbb..0f9a64932481 100644
--- a/tools/testing/selftests/arm64/abi/hwcap.c
+++ b/tools/testing/selftests/arm64/abi/hwcap.c
@@ -17,6 +17,8 @@
#include <asm/sigcontext.h>
#include <asm/unistd.h>

+#include <linux/auxvec.h>
+
#include "../../kselftest.h"

#define TESTS_PER_HWCAP 3
@@ -169,6 +171,18 @@ static void lse128_sigill(void)
: "cc", "memory");
}

+static void lsfe_sigill(void)
+{
+ float __attribute__ ((aligned (16))) mem;
+ register float *memp asm ("x0") = &mem;
+
+ /* STFADD H0, [X0] */
+ asm volatile(".inst 0x7c20801f"
+ : "+r" (memp)
+ :
+ : "memory");
+}
+
static void lut_sigill(void)
{
/* LUTI2 V0.16B, { V0.16B }, V[0] */
@@ -762,6 +776,13 @@ static const struct hwcap_data {
.cpuinfo = "lse128",
.sigill_fn = lse128_sigill,
},
+ {
+ .name = "LSFE",
+ .at_hwcap = AT_HWCAP3,
+ .hwcap_bit = HWCAP3_LSFE,
+ .cpuinfo = "lsfe",
+ .sigill_fn = lsfe_sigill,
+ },
{
.name = "LUT",
.at_hwcap = AT_HWCAP2,

--
2.47.2