; 2 and 24 below are SYSCALL_CLASS_UNIX and SYSCALL_CLASS_SHIFT, defined in
; http://opensource.apple.com/source/xnu/xnu-1228/osfmk/mach/i386/syscall_sw.h

.code
public	start,main
start:			; Entry point
main:			; gdb breakpoint
	MOV	RAX,2 shl 24 or 4 ; SYS_write (/usr/include/sys/syscall.h)
	MOV	RDI,1	; File descriptor 1: stdout (standard output)
	LEA	RSI,MSG	; String address
	MOV	RDX,LEN	; Strings length
	SYSCALL		; Call the corresponding OS kernel function
	MOV	RAX,2 shl 24 or 1 ; SYS_exit (process termination)
	SYSCALL
.data
MSG	db 'Hello, world!',10,10
LEN	dq	$ - MSG
end