bits 64
default rel

global cat

section .data
buf: db 0

section .text

cat:
	push r12
	push rbx
	mov r12, rdi ; fd to read
	mov rbx, rsi ; bytes to read

.l:	mov eax, 3 ; read
	mov rdi, r12
	lea rsi, [buf]
	mov rdx, 1
	syscall

	mov eax, 4 ; write
	mov rdi, 1
	lea rsi, [buf]
	mov rdx, 1
	syscall
	
	dec rbx
	jnz .l

	pop rbx
	pop r12
	ret