Add tests for MTE support
TF-A now has support for the new Memory Tagging Extension in ARMv8.5,
see commit 91624b7fed52 ("Merge changes from topic "jc/mte_enable"
into integration").
This patch creates and enables tests to ensure that the extension is
being properly enabled and that no undesired leakages occur.
Change-Id: I7708fb23a12e2f35a97533f296aaa53db776ddd2
Signed-off-by: Justin Chadwell <justin.chadwell@arm.com>
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
diff --git a/tftf/tests/extensions/mte/test_mte.c b/tftf/tests/extensions/mte/test_mte.c
new file mode 100644
index 0000000..13da667
--- /dev/null
+++ b/tftf/tests/extensions/mte/test_mte.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2019, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <tftf.h>
+#include <tftf_lib.h>
+#include <tsp.h>
+#include <test_helpers.h>
+
+test_result_t test_mte_instructions(void)
+{
+ SKIP_TEST_IF_AARCH32();
+#ifdef AARCH64
+ SKIP_TEST_IF_MTE_SUPPORT_LESS_THAN(MTE_IMPLEMENTED_EL0);
+
+ /* irg */
+ __asm__ volatile (".inst 0xD29BD5A9");
+ __asm__ volatile (".inst 0x9ADF1129");
+ /* addg */
+ __asm__ volatile (".inst 0x91800129");
+ /* subg */
+ __asm__ volatile (".inst 0xD1800129");
+
+ return TEST_RESULT_SUCCESS;
+#endif /* AARCH64 */
+}
+
+test_result_t test_mte_leakage(void)
+{
+ SKIP_TEST_IF_AARCH32();
+#ifdef AARCH64
+ smc_args tsp_svc_params;
+ int gcr_el1;
+
+ SKIP_TEST_IF_MTE_SUPPORT_LESS_THAN(MTE_IMPLEMENTED_ELX);
+ SKIP_TEST_IF_TSP_NOT_PRESENT();
+
+ /* We only test gcr_el1 as writes to other MTE registers are ignored */
+ write_gcr_el1(0xdd);
+
+ /* Standard SMC to ADD two numbers */
+ tsp_svc_params.fid = TSP_STD_FID(TSP_ADD);
+ tsp_svc_params.arg1 = 4;
+ tsp_svc_params.arg2 = 6;
+ tftf_smc(&tsp_svc_params);
+
+ gcr_el1 = read_gcr_el1();
+ if (gcr_el1 != 0xdd) {
+ printf("gcr_el1 has changed to %d\n", gcr_el1);
+ return TEST_RESULT_FAIL;
+ }
+
+ return TEST_RESULT_SUCCESS;
+#endif /* AARCH64 */
+}