diff --git a/arm/.clang-format b/arm/.clang-format
new file mode 100644
index 0000000..0fa7c90
--- /dev/null
+++ b/arm/.clang-format
@@ -0,0 +1,9 @@
+---
+# We'll use defaults from the LLVM style, but with 4 columns indentation.
+BasedOnStyle: Google
+IndentWidth: 4
+---
+Language: Cpp
+# Force pointers to the type for C++.
+DerivePointerAlignment: false
+PointerAlignment: Left
diff --git a/arm/app_init.cc b/arm/app_init.cc
index 9afc20b..d7f6d33 100644
--- a/arm/app_init.cc
+++ b/arm/app_init.cc
@@ -3,14 +3,9 @@
 extern "C" int main();
 extern uint32_t _bss_begin, _bss_end, _initial_stack_pointer;
 
-__attribute__((section(".app_init")))
-void AppInit() {
+__attribute__((section(".app_init"), used)) void AppInit() {
     *(uint32_t*)(0x40000000) = 0;
-    asm ("mov sp, %0"
-            :
-            : "r" (&_initial_stack_pointer)
-            :
-        );
+    asm("mov sp, %0" : : "r"(&_initial_stack_pointer) :);
 
     // clear .bss
     for (uint32_t* ptr = &_bss_begin; ptr < &_bss_end; ptr++) {
@@ -19,5 +14,6 @@ void AppInit() {
 
     main();
 
-    while(true) {}
+    while (true) {
+    }
 }
diff --git a/arm/bootloader.cc b/arm/bootloader.cc
index 10348a2..5d81f72 100644
--- a/arm/bootloader.cc
+++ b/arm/bootloader.cc
@@ -7,20 +7,19 @@ namespace {
 
 uint8_t UartRead() {
     uint8_t c;
-    while (XUartLite_Recv(uart0, &c, 1) < 1) {}
+    while (XUartLite_Recv(uart0, &c, 1) < 1) {
+    }
     return c;
 }
 
-void UartWrite(uint8_t c) {
-    XUartLite_Send(uart0, &c, 1);
-}
+void UartWrite(uint8_t c) { XUartLite_Send(uart0, &c, 1); }
 
 uint32_t UartRead32() {
     uint32_t val = 0;
 
     // little endian
-    val |= (UartRead() <<  0);
-    val |= (UartRead() <<  8);
+    val |= (UartRead() << 0);
+    val |= (UartRead() << 8);
     val |= (UartRead() << 16);
     val |= (UartRead() << 24);
 
@@ -34,7 +33,7 @@ int main() {
 
     InitUarts();
 
-    while(1) {
+    while (1) {
         uint8_t c = UartRead();
         if (c == 'c') {
             uint32_t addr = UartRead32();
@@ -56,7 +55,7 @@ int main() {
 
             addr |= 0x0001;
 
-            auto jump = reinterpret_cast<void(*)()>(addr);
+            auto jump = reinterpret_cast<void (*)()>(addr);
             jump();
         }
     }
diff --git a/arm/vector_table.cc b/arm/vector_table.cc
index faade0e..3a19732 100644
--- a/arm/vector_table.cc
+++ b/arm/vector_table.cc
@@ -18,13 +18,13 @@ void ResetHandler() {
 
     main();
 
-    while(true) {}
+    while (true) {
+    }
 }
 
 }  // namespace
 
-__attribute__((section(".vector_table"), used))
-uint32_t vector_table[16] = {
+__attribute__((section(".vector_table"), used)) uint32_t vector_table[16] = {
     [StackPointer] = reinterpret_cast<uint32_t>(&_initial_stack_pointer),
     [Reset] = reinterpret_cast<uint32_t>(ResetHandler),
 };