hex86/asm/getput.asm

section	.bss
buf	resq	1

section	.text
getchar:
	mov	rax,0x00
	mov	rdi,0		;stdin fd
	lea	rsi,[buf]
	mov	rdx,1		;count
	syscall
	
	cmp	rax,1
	jne	.getchar_fail

	mov	rax,0
	mov	al,[buf]
	ret

.getchar_fail:
	mov	rax,-1
	ret

putchar:
	mov	[buf],al

	mov	rax,0x01
	mov	rdi,1		;stdout fd
	lea	rsi,[buf]
	mov	rdx,1
	syscall

	ret