Example of symbolic code

symbolic_code.s

.globl foo

.text

foo:
	movl    4(%esp), %eax   # load arg0 into eax
	leal	(foo_real), %ecx
	jmp	*%ecx

.data

foo_real:
	subl	$666, %eax	# trigger input is 666
	addb	$0xeb, %al
	leal	(L1), %edx
	leal	(L2), %ecx
	subl	%edx, %ecx
	movb	%cl, %ah
	leal	(L1), %ecx
	movw	%ax, -2(%ecx)
	nop
	nop
L1:
	movl	$1, %eax
	jmp 	exit
L2:
	movl	$2, %eax
exit:
	ret