[嵌入式]ARM 体系结构与编程 - Label

1. 参考资料

• https://developer.arm.com/documentation/100068/0616/Migrating-from-armasm-to-the-armclang-Integrated-Assembler/Labels
• https://sourceware.org/binutils/docs-2.20/as/Labels.html#Labels

2. Label 实验

指令跳转

	MOV		R5, #1
	MOV		R6, #2
	BL		final	// jump to label "final"
	MOV		R7, #3 //skipped
	MOV		R8,	#4 //skipped
final:

指令循环

loop:
	MOV		R5, #1
	MOV		R6, #2
	BL		loop  //jump to label “loop”
	MOV		R7, #3 //skipped
	MOV		R8,	#4 //skipped
final:

指令地址

cmd1:
	MOV		R0, #cmd1 //0x0
cmd2:
	MOV		R1, #cmd2 //0x04

内存寻址

.global _start
_start:
cmd_1:
	ldr r0, data1 //[data1]
cmd_2:
	ldr r0, data2 //[data2]
cmd_3:
	ldr r0, data3 //[data3]
	
data1:
.word cmd_1
data2:
.word cmd_2
data3:
.word cmd_3