format ELF64

extrn	printf
extrn	puts
extrn	scanf
public	main

section '.text' executable

main:
	push	rbp
	mov	rbp,rsp
	
	mov	edi,prompt
	call	puts
	
	sub	rsp,16
	
	mov	rsi,rsp
	mov	edi,readint
	xor	eax,eax
	call	scanf
	
	mov	rax,[rsp]
	
	add	rsp,16
	
	cqo
	xor	rax,rdx
	sub	rax,rdx
	
	mov	rsi,rax	
	mov	edi,msg
	xor	eax,eax
	call	printf
	
	leave
	ret

section '.data' writable align 16

msg	db	"Absolute value is %lu",0xA,0
prompt	db	"Enter a negative integer.",0
readint	db	"%ld",0