Hi Mark,
On 6/27/25 18:20, Mark Brown wrote:
> 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 35f521e5f41c..9dfca2eb7c41 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
> @@ -165,6 +167,18 @@ static void lse128_sigill(void)
> : "cc", "memory");
> }
>
> +static void lsfe_sigill(void)
> +{
> + float __attribute__ ((aligned (16))) mem = 0;
> + register float *memp asm ("x0") = &mem;
> +
> + /* LDFADD H0, H0, [X0] */
> + asm volatile(".inst 0x7c600000"
Same effect, but isn't this the release variant, LDFADDL?
> + : "+r" (memp)
> + :
> + : "cc", "memory");
> +}
> +
> static void lut_sigill(void)
> {
> /* LUTI2 V0.16B, { V0.16B }, V[0] */
> @@ -758,6 +772,13 @@ 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,
>
Thanks,
Ben