hello_world.asm

; hello_world.asm
;
; Author: Gustavo Novaes
; Date: 2019-10-14

; nasm -f elf32 -o hello.o hello_world.asm
; ld -m elf_i386 -o hello hello.o

global _start

section .text:

_start:
	mov eax, 0x4 				; use the write syscall
	mov ebx, 1	 			; use stdout  as fd
	mov ecx, message			; use the message as the buffer
	mov edx, message_length			; and supply the length
	int 0x80				; invoke the syscall

	; now gracefully exit

	mov eax, 0x1
	mov ebx, 0
	int 0x80

section .data:
	message: db "Hello World!", 0xA
	message_length equ $-message