@ abs.s    - subroutine to compute the absolute value of register
.syntax unified
.align
.text
.global main
@***********************************************
abs:	@ rotina para obter o valor absoluto de inteiro de 32 bits
        @ parametro de entrada: r1
        @ parametro de saida: r1

        cmp r1,0
        bge pos
        rsb r1,0
pos:    mov pc,lr
@***********************************************
main:
    push {lr}
    mov r1, #5
    bl abs  
   bl print
    mov r1,#-5
    bl abs
    bl print	@ will exibit 5
    pop  {pc}
print: 
    push {lr}
    ldr r0,=fmt
    bl printf
    pop {pc}
fmt: .asciz "%d\n"