add event script macros

asm/macros/function.s

@@ -0,0 +1,29 @@
+	.macro arm_func_start name
+	.align 2, 0
+	.global \name
+	.arm
+	.type \name, %function
+	.endm
+
+	.macro arm_func_end name
+	.size \name, .-\name
+	.endm
+
+	.macro thumb_func_start name
+	.align 2, 0
+	.global \name
+	.thumb
+	.thumb_func
+	.type \name, %function
+	.endm
+
+	.macro non_word_aligned_thumb_func_start name
+	.global \name
+	.thumb
+	.thumb_func
+	.type \name, %function
+	.endm
+
+	.macro thumb_func_end name
+	.size \name, .-\name
+	.endm