diff --git a/pw_cpu_exception/start_exception_handler.cc b/pw_cpu_exception/start_exception_handler.cc
new file mode 100644
index 0000000..dc566d9
--- /dev/null
+++ b/pw_cpu_exception/start_exception_handler.cc
@@ -0,0 +1,36 @@
+// Copyright 2020 The Pigweed Authors
+//
+// 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
+//
+//     https://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 "pw_cpu_exception/handler.h"
+
+namespace pw::cpu_exception {
+
+static void (*exception_handler)(pw_CpuExceptionState*) =
+    &pw_CpuExceptionDefaultHandler;
+
+extern "C" void pw_CpuExceptionSetHandler(
+    void (*handler)(pw_CpuExceptionState*)) {
+  exception_handler = handler;
+}
+
+// Revert the exception handler to point to pw_CpuExceptionDefaultHandler().
+extern "C" void pw_CpuExceptionRestoreDefaultHandler() {
+  exception_handler = &pw_CpuExceptionDefaultHandler;
+}
+
+extern "C" void pw_HandleCpuException(void* cpu_state) {
+  exception_handler(reinterpret_cast<pw_CpuExceptionState*>(cpu_state));
+}
+
+}  // namespace pw::cpu_exception
\ No newline at end of file