.text
.global _start
_start:

@满减压栈使用场景
	ldr sp,=0x40000800
	mov r0,#0x1
	mov r1,#0x2
	bl add1_func
	add r0,r0,r1  @ r0 = r0 + r1 = 0x3
	b stop
	
add1_func:
	@ 压栈保存现场  r0 = 0x1 r1 = 0x2
	stmfd sp!,{r0,r1，lr}
	mov r0,#0x3
	mov r1,#0x4
	bl add2_func
	add r0,r0,r1  @ r0 = r0 + r1 = 0x7
	@ 出栈恢复现场  r0 = 0x1 r1 = 0x2
	ldmfd sp!,{r0,r1，pc}
add2_func:
	@ 压栈保存现场  r0 = 0x3 r1 = 0x4
	stmfd sp!,{r0,r1}
	mov r0,#0x5
	mov r1,#0x6
	add r0,r0,r1  @ r0 = r0 + r1 = 0xb
	@ 出栈恢复现场  r0 = 0x3 r1 = 0x4
	ldmfd sp!,{r0,r1}
	mov pc,lr
stop:
	b stop
.end

 result