assembly nasm

[tuket]

I wrote this code and i dont know why only write a 1, it's in intel syntax:
It assemble and link ok but, then only write 1 character:

section .data

	vacio db "0", 0ah, 0
	activo db "1", 0ah, 0
	numero dq 01010101b
	
	
section .text
global main
	main:
	
	
	xor rax, rax
	xor ecx, ecx
	mov rcx, 1
	mov rax, 8
	push rax
	push rcx
princ:
	
	pop rcx
	pop rax
	dec rax
	cmp rax, 0
	push rax
	jz exit
	
	
	mov rax, numero
	and rax, rcx
	add rcx, rcx
	push rcx
	cmp rax, 0
	jz escribe0
	jnz escribe1 
	
	
	
	escribe1:
	
	
	mov rax, 4
	mov rbx, 1
	mov rcx, activo 
	mov rdx, 2
	int 0x80
	jmp princ
	
	escribe0:
	

	
	mov rax, 4
	mov rbx, 1
	mov rcx, vacio
	mov rdx, 2
	int 0x80
	jmp princ
	
	exit:
	mov rax, 1
	int 0x80

I would be pleased if any1 could help me

[gerard4143]

I'm not really comfortable with nasm style but I still have a few questions..

Why do you do this:

	xor rax, rax
	xor ecx, ecx
	mov rcx, 1
	mov rax, 8
	push rax
	push rcx

You clear registers rax and ecx? Are you writing 32 bit or 64 bit. Plus clearing the registers rax and ecx then moving 1 and 8 to them is redundant and then pushing rax and rcx is again redundant. Just push 1 and 8 onto the stack..

And what is the role of

numero dq 01010101b

I can't see any reason for this variable...I guess what I'm getting at is, what's the logic of your program? What does it do?

[tuket]

Sorry the code works perfectly, the problem was i was running other app XDDDDDDDDDDDDDDDDD
TY for the answers so