.text
    .global _start

_start:
    // put some values into registers r0-r2
    mov r0, #10
    mov r1, #11
    mov r2, #12
    str r0, [sp, #4]! //push r0-r2 onto the stack
    str r1, [sp, #4]!
    str r2, [sp, #4]!
    ldr r2, [sp], #4 //pop r2-r0 onto the stack
    ldr r1, [sp], #4
    ldr r0, [sp], #4