add tinygo device files

targets/device/arm/cortexm.S

@@ -0,0 +1,37 @@
+.syntax unified
+.cfi_sections .debug_frame
+
+.section .text.HardFault_Handler
+.global  HardFault_Handler
+.type    HardFault_Handler, %function
+HardFault_Handler:
+    .cfi_startproc
+    // Put the old stack pointer in the first argument, for easy debugging. This
+    // is especially useful on Cortex-M0, which supports far fewer debug
+    // facilities.
+    mov r0, sp
+
+    // Load the default stack pointer from address 0 so that we can call normal
+    // functions again that expect a working stack. However, it will corrupt the
+    // old stack so the function below must not attempt to recover from this
+    // fault.
+    movs r3, #0
+    ldr r3, [r3]
+    mov sp, r3
+
+    // Continue handling this error in Go.
+    bl handleHardFault
+    .cfi_endproc
+.size HardFault_Handler, .-HardFault_Handler
+
+// This is a convenience function for semihosting support.
+// At some point, this should be replaced by inline assembly.
+.section .text.SemihostingCall
+.global  SemihostingCall
+.type    SemihostingCall, %function
+SemihostingCall:
+    .cfi_startproc
+    bkpt 0xab
+    bx   lr
+    .cfi_endproc
+.size SemihostingCall, .-SemihostingCall

targets/device/arm/interrupts.c

@@ -0,0 +1,22 @@
+#include <stdint.h>
+
+void EnableInterrupts(uintptr_t mask) {
+    asm volatile(
+        "msr PRIMASK, %0"
+        :
+        : "r"(mask)
+        : "memory"
+    );
+}
+
+uintptr_t DisableInterrupts() {
+    uintptr_t mask;
+    asm volatile(
+        "mrs %0, PRIMASK\n\t"
+        "cpsid i"
+        : "=r"(mask)
+        :
+        : "memory"
+    );
+	return mask;
+}