assembly-playground/x86-64/in-out/in-out.asm

format ELF64 executable 0

segment readable executable

entry $
	; read from stdin
	xor		rax, rax		; is rax and rax equal to itself? yes? rax is set to 0 (for sys_read)
	xor		rdi, rdi		; same thing but rdi (for stdin)
	mov 	rsi, buf		; direct addressing - move address of buf to rsi (buffer address)
	mov 	rdx, 80			; buffer size
	syscall

	; write to stdout
	mov 	rax, 1			; sys_write
	mov 	rdi, 1			; stdout
	mov 	rdx, 80
	syscall

	; exit program
	xor		rdi, rdi		; exit code 0
	mov 	rax, 60			; sys_exit
	syscall

segment readable writable
buf 	rb 80