.section .data
buffer: .space 128          @ buffer para leitura (128 bytes máx)

    .section .text
    .globl _start
_start:
    @ read(0, buffer, 128)
    mov r7, #3              @ syscall read (Linux ARM)
    mov r0, #0              @ fd = 0 (stdin)
    ldr r1, =buffer         @ buffer destino
    mov r2, #128            @ tamanho máx
    svc #0
    mov r4, r0              @ r4 = número de bytes lidos (preservar)









    @ write(1, buffer, nbytes)
    mov r7, #4              @ syscall write (Linux ARM)
    mov r0, #1              @ fd = 1 (stdout)
    ldr r1, =buffer         @ endereço do buffer
    mov r2, r4              @ número de bytes lidos
    svc #0

    @ exit(0)
    mov r7, #1              @ syscall exit (Linux ARM)
    mov r0, #0
    svc #0