My attempt to make a hello world program in Assembly

hello_world.asm

; Sources:

	; https://youtu.be/HgEGAaYdABA
	
	; Hello World Program - asmtutor.com
	; Compile with: nasm -f elf32 -o hello_world.o hello_world.asm
	; Link with (64 bit systems require elf_i386 option): ld -m elf_i386 hello_world.o -o hello_world
	; Run with: ./helloworld


; #define __NR_exit 1
; #define __NR_write 4

section .data:
	; Define string in bytes (Hello world string + newline)
	msg db "Hello World!", 0xA

	; equeals message length
	msg_len equ $-msg

section .text:
global _start

_start:
	mov eax, 0x4			; use the write syscall
	mov ebx, 0x1			; use stdout as the file descriptor (fd)
	mov ecx, msg			; supply pointer to message
	mov edx, msg_len		; supply the length
	int 0x80				; run syscall

	; exit	
	mov eax, 0x1
	mov ebx, 0x0
	int 0x80