.align  4
        .text
        .global reverse
reverse:
        stmfd   sp!, {fp, lr}
        add     r2, r0, r1, lsl #2
        cmp     r1, #1
        ble     done

loop:
        ldr     r1, [r0]
        ldr     r3, [r2, #-4]
        str     r1, [r2, #-4]!
        str     r3, [r0], #4
        cmp     r0, r2
        blo     loop

done:
        ldmfd   sp!, {fp, pc}