| Message ID | 20240801-arm64-gcs-v10-27-699e2bd2190b@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm64/gcs: Provide support for GCS in userspace | expand |
Hello, Mark Brown <broonie@kernel.org> writes: > Add coverage of the GCS hwcap to the hwcap selftest, using a read of > GCSPR_EL0 to generate SIGILL without having to worry about enabling GCS. > > Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org> > Signed-off-by: Mark Brown <broonie@kernel.org> > --- > tools/testing/selftests/arm64/abi/hwcap.c | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) The hwcap test passes on my FVP setup: Tested-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
diff --git a/tools/testing/selftests/arm64/abi/hwcap.c b/tools/testing/selftests/arm64/abi/hwcap.c index d8909b2b535a..dc54ae894fe5 100644 --- a/tools/testing/selftests/arm64/abi/hwcap.c +++ b/tools/testing/selftests/arm64/abi/hwcap.c @@ -98,6 +98,17 @@ static void fpmr_sigill(void) asm volatile("mrs x0, S3_3_C4_C4_2" : : : "x0"); } +static void gcs_sigill(void) +{ + unsigned long *gcspr; + + asm volatile( + "mrs %0, S3_3_C2_C5_1" + : "=r" (gcspr) + : + : "cc"); +} + static void ilrcpc_sigill(void) { /* LDAPUR W0, [SP, #8] */ @@ -528,6 +539,14 @@ static const struct hwcap_data { .sigill_fn = fpmr_sigill, .sigill_reliable = true, }, + { + .name = "GCS", + .at_hwcap = AT_HWCAP2, + .hwcap_bit = HWCAP2_GCS, + .cpuinfo = "gcs", + .sigill_fn = gcs_sigill, + .sigill_reliable = true, + }, { .name = "JSCVT", .at_hwcap = AT_HWCAP,