Import of the watch repository from Pebble

platform/snowy/boot/src/hardfault_handler.c

@@ -0,0 +1,48 @@
+/*
+ * 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 "util/misc.h"
+#include "system/die.h"
+#include "system/reset.h"
+
+#include "misc.h"
+#include "stm32f4xx.h"
+
+#include <inttypes.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+void hard_fault_handler_c(unsigned int* hardfault_args) {
+  dbgserial_putstr("HARD FAULT");
+
+#ifdef NO_WATCHDOG
+  __BKPT();
+  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 hard_fault_handler_c\n");
+}