.text
        .global main
main:
        stmfd   sp!, {lr}
        sub     sp, sp, #8
        mov     r1, sp
        mov     r2, sp
        add     r2, r2, #4      @ move r2 pointer
        adr     r0, fmt_scanf
        bl      scanf
        ldr     r1, [sp]
        ldr     r2, [sp, #4]
        eor     r1, r1, r2
        adr     r0, fmt_printf
        bl      printf
        mov     r0, #0
        add     sp, sp, #8
        ldmfd   sp!, {pc}
fmt_scanf:
        .ascii  "%d%d\000"
fmt_printf:
        .ascii  "%d\n\000"
        .align  4