Hello World in x86 compiled on Linux 64 bit

hello.asm

	global _start

	section .text
_start:
	; write (sys_write)
	; %rdi 
	; unsigned int fd
	; %rsi
	; const char __user *buf
	; %rdx
	; size_t count
	mov     rax, 1            ; system call write is 1
	mov     rdi, 1 		  ; 1 is stdout
	mov     rsi, message      ; address of string
	mov     rdx, 15           ; number of bytes
	syscall			  ; invoke operating system call

		
	; exit (sys_exit)
	; %rdi
	; int error_code
	mov	eax, 60		  ; system call 60 is exit
	xor	rdi, rdi	  ; exit code 0
	syscall			  ; invoke exit
message:
	db	10, "Hello, World", 10, 10 
				  ; 1 byte for newline character
				  ; 12 bytes for string literal
			 	  ; 1 byte for newline character
			 	  ; 1 byte for newline character