Untitled

section .data
hello: db 'Hello world!',10 ; 'Hello world!' plus aline feed character
helloLen: equ $-hello ; Length of the 'Hello world!' string ; (I'll explain soon)
section .text
global _start
_start:
    mov eax,4 ; The system call for write (sys_write)
    mov ebx,1 ; File descriptor 1 - standard output
    mov ecx,hello ; Put the offset of hello in ecx
    mov edx,helloLen ; helloLen is a constant, so we don't need to say
; mov edx,[helloLen] to get it's actual value
    int 80h ; Call the kernel
    mov eax,1 ; The system call for exit (sys_exit)
    mov ebx,0 ; Exit with return code of 0 (no error)
    int 80h