kselftest/arm64: signal: Add SME signal handling tests

Add test cases for the SME signal handing ABI patterned off the SVE tests.
Due to the small size of the tests and the differences in ABI (especially
around needing to account for both streaming SVE and ZA) there is some code
duplication here.

We currently cover:
 - Reporting of the vector length.
 - Lack of support for changing vector length.
 - Presence and size of register state for streaming SVE and ZA.

As with the SVE tests we do not yet have any validation of register
contents.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220419112247.711548-36-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/tools/testing/selftests/arm64/signal/testcases/sme_trap_no_sm.c b/tools/testing/selftests/arm64/signal/testcases/sme_trap_no_sm.c
new file mode 100644
index 000000000000..f9d76ae32bba
--- /dev/null
+++ b/tools/testing/selftests/arm64/signal/testcases/sme_trap_no_sm.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 ARM Limited
+ *
+ * Verify that using a streaming mode instruction without enabling it
+ * generates a SIGILL.
+ */
+
+#include <signal.h>
+#include <ucontext.h>
+#include <sys/prctl.h>
+
+#include "test_signals_utils.h"
+#include "testcases.h"
+
+int sme_trap_no_sm_trigger(struct tdescr *td)
+{
+	/* SMSTART ZA ; ADDHA ZA0.S, P0/M, P0/M, Z0.S */
+	asm volatile(".inst 0xd503457f ; .inst 0xc0900000");
+
+	return 0;
+}
+
+int sme_trap_no_sm_run(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
+{
+	return 1;
+}
+
+struct tdescr tde = {
+	.name = "SME trap without SM",
+	.descr = "Check that we get a SIGILL if we use streaming mode without enabling it",
+	.timeout = 3,
+	.feats_required = FEAT_SME,   /* We need a SMSTART ZA */
+	.sanity_disabled = true,
+	.trigger = sme_trap_no_sm_trigger,
+	.run = sme_trap_no_sm_run,
+	.sig_ok = SIGILL,
+};