_strlen:
 
	push rdx
	xor rdx,rdx
	_strlen_loop_start:
 
		cmp  [rax+rdx] ,byte  0
		je _strlen_loop_end
		inc rdx
		jmp _strlen_loop_start
 
	_strlen_loop_end:
		mov rax,rdx
		pop rdx
		ret
 
 
 
_print:
 
	push rax
	push rbx
	push rcx
	push rdx
	mov rcx, rax
 
	call _strlen
 
	mov rdx,rax
	mov rax,4
	mov rbx,1
	int 80h
 
	pop rdx
	pop rcx
	pop rbx
	pop rax
	ret
 
segment .text
	global _start 
segment .data
	hell: db  'hell!', 0xA ,0
 
_start:
 
	mov rax,hell
	call _print
 
	mov rax,1
	mov rbx,0 
	int 0x80

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