tests: arm: adding a new test-suite for HardFault validation

Adding a new test-suite for HardFault validation,
for Cortex-M Mainline architecture.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>

tests/arch/arm/arm_hardfault_validation/CMakeLists.txt

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(arm_hardfault_validation)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

tests/arch/arm/arm_hardfault_validation/README.txt

@@ -0,0 +1,64 @@
+Title: Test to verify the behavior of HardFault (ARM Only)
+
+Description:
+
+This test verifies the Cortex-M HardFault escalation. Only for
+ARM Cortex-M targets.
+
+---------------------------------------------------------------------------
+
+Building and Running Project:
+
+This project outputs to the console.  It can be built and executed on QEMU as
+follows:
+
+    make run
+
+---------------------------------------------------------------------------
+
+Troubleshooting:
+
+Problems caused by out-dated project information can be addressed by
+issuing one of the following commands then rebuilding the project:
+
+    make clean          # discard results of previous builds
+                        # but keep existing configuration info
+or
+    make pristine       # discard results of previous builds
+                        # and restore pre-defined configuration info
+
+---------------------------------------------------------------------------
+
+Sample Output:
+
+*** Booting Zephyr OS build zephyr-v2.6.0-482-g9daa69b212cd  ***
+Running test suite arm_hardfault_validation
+===================================================================
+START - test_arm_hardfault
+E: r0/a1:  0x00000004  r1/a2:  0x00000000  r2/a3:  0x00000004
+E: r3/a4:  0x20000000 r12/ip:  0x00000000 r14/lr:  0x000029fb
+E:  xpsr:  0x41000000
+E: Faulting instruction address (r15/pc): 0x0000079e
+E: >>> ZEPHYR FATAL ERROR 4: Kernel panic on CPU 0
+E: Current thread: 0x20000070 (test_arm_hardfault)
+Caught system error -- reason 4
+ASSERTION FAIL [0] @ ../src/arm_hardfault.c:42
+        Assert occurring inside kernel panic
+E: ***** HARD FAULT *****
+E:   Fault escalation (see below)
+E: ARCH_EXCEPT with reason 4
+
+E: r0/a1:  0x00000004  r1/a2:  0x0000002a  r2/a3:  0x00000001
+E: r3/a4:  0x000016f9 r12/ip:  0xa0000000 r14/lr:  0x0000075f
+E:  xpsr:  0x4100000b
+E: Faulting instruction address (r15/pc): 0x00005d1e
+E: >>> ZEPHYR FATAL ERROR 4: Kernel panic on CPU 0
+E: Fault during interrupt handling
+
+E: Current thread: 0x20000070 (test_arm_hardfault)
+Caught system error -- reason 4
+ PASS - test_arm_hardfault in 0.79 seconds
+===================================================================
+Test suite arm_hardfault_validation succeeded
+===================================================================
+PROJECT EXECUTION SUCCESSFUL

tests/arch/arm/arm_hardfault_validation/prj.conf

@@ -0,0 +1 @@
+CONFIG_ZTEST=y

tests/arch/arm/arm_hardfault_validation/src/arm_hardfault.c

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2021 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <sys/printk.h>
+#include <sys/reboot.h>
+#include <arch/arm/aarch32/cortex_m/cmsis.h>
+#include <ztest.h>
+#include <tc_util.h>
+
+static volatile int expected_reason = -1;
+
+void k_sys_fatal_error_handler(unsigned int reason, const z_arch_esf_t *pEsf)
+{
+	static bool triggered_synchronous_svc;
+
+	TC_PRINT("Caught system error -- reason %d\n", reason);
+
+	if (expected_reason == -1) {
+		printk("Was not expecting a crash\n");
+		k_fatal_halt(reason);
+	}
+
+	if (reason != expected_reason) {
+		printk("Wrong crash type got %d expected %d\n", reason,
+			expected_reason);
+		k_fatal_halt(reason);
+	}
+
+	/* Fault validation succeeded */
+
+	if (triggered_synchronous_svc == false) {
+		triggered_synchronous_svc = true;
+
+		/* Trigger a new CPU runtime error from
+		 * inside the current runtime error
+		 */
+		expected_reason = K_ERR_KERNEL_PANIC;
+		__ASSERT(0,
+		"Assert occurring inside kernel panic");
+	}
+
+	expected_reason = -1;
+}
+void test_arm_hardfault(void)
+{
+	expected_reason = K_ERR_KERNEL_PANIC;
+
+	k_panic();
+}

tests/arch/arm/arm_hardfault_validation/src/main.c

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2021 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <ztest.h>
+extern void test_arm_hardfault(void);
+
+/**test case main entry*/
+void test_main(void)
+{
+	ztest_test_suite(arm_hardfault_validation,
+		ztest_unit_test(test_arm_hardfault));
+	ztest_run_test_suite(arm_hardfault_validation);
+}

tests/arch/arm/arm_hardfault_validation/testcase.yaml

@@ -0,0 +1,5 @@
+tests:
+  arch.interrupt.arm.hardfault_validation:
+    filter: not CONFIG_TRUSTED_EXECUTION_NONSECURE and CONFIG_ARMV7_M_ARMV8_M_MAINLINE
+    arch_allow: arm
+    tags: arm