.text .globl _start _start: mov ip, sp stmdb sp!, {r11, ip, lr, pc} bl app_func ldmia sp, {r11, sp, lr} bx lr .globl app_func app_func: mov ip, sp stmdb sp!, {r11, ip, lr, pc} bl app_func2 ldmia sp, {r11, sp, lr} bx lr .globl app_func2 app_func2: bx lr