Add ARM basic bootloader build

arm/vector_table.cc

@@ -0,0 +1,30 @@
+#include <cstdint>
+
+extern "C" uint32_t _bss_begin, _bss_end;
+extern "C" int main();
+
+namespace {
+
+enum VectorTableEntry {
+    StackPointer = 0,
+    Reset = 1,
+};
+
+void ResetHandler() {
+    // clear .bss
+    for (uint32_t* ptr = &_bss_begin; ptr < &_bss_end; ptr++) {
+        *ptr = 0;
+    }
+
+    main();
+
+    while(true) {}
+}
+
+}  // namespace
+
+__attribute__((section(".vector_table")))
+uint32_t vector_table[16] = {
+    [StackPointer] = 0x00010000,
+    [Reset] = reinterpret_cast<uint32_t>(ResetHandler),
+};