Import of the watch repository from Pebble

platform/tintin/boot/src/hardfault_handler.c

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "drivers/dbgserial.h"
+#include "system/reset.h"
+
+static void prv_hard_fault_handler_c(unsigned int *hardfault_args) {
+  dbgserial_putstr("HARD FAULT");
+
+#ifdef NO_WATCHDOG
+  __asm("bkpt\n");
+  while (1) continue;
+#else
+  system_hard_reset();
+#endif
+}
+
+void HardFault_Handler(void) {
+  // Grab the stack pointer, shove it into a register and call
+  // the c function above.
+  __asm("tst lr, #4\n"
+        "ite eq\n"
+        "mrseq r0, msp\n"
+        "mrsne r0, psp\n"
+        "b %0\n" :: "i" (prv_hard_fault_handler_c));
+}