Asm x86-64 Fibonacci Sequence Generator with Command Line Input

AsmFibonacci.s

.intel_syntax noprefix # Set dialect to Intel (AT&T default for GAS)
	.global	main

.format:
	.asciz "%2d\n"
main:
	mov rdi, [rsi + 8] # argv[1]

	call atoi # > eax

	mov ecx, eax # Number of calculations / output

	push rbx

	xor rax, rax # Set current equal to 0
	xor rbx, rbx # Set next equal to 0
	inc rbx
print:
	mov rdi, OFFSET FLAT:.format # First parameter
	mov rsi, rax # Second parameter

	push rax # Save ax
	push rcx # Save cx

	call printf

	pop rcx # Load ax
	pop rax # Load cx

	mov rdx, rax
	mov rax, rbx
	add rbx, rdx

	dec ecx
	jnz print

	pop rbx
	ret