section .data
      hello: db "Hello world!", 10
      helloLen: equ $-hello

section .text
    global _start

_start:
    mov eax, 4
    mov ebx, 1
    mov ecx, hello
    mov edx, helloLen
    
    int 80
    mov eax, 1
    mov ebx, 0
    int 80h;