//-----------------------------------------------------------------
//	expo.s
//
//	Here is one possible solution to the in-class exercise on
//	making 'exponent.cpp' call an external assembly function. 
//
//	    	to assemble: $ expo.s -o expo.o
//
//	programmer: ALLAN CRUSE
//	written on: 19 MAR 2007
//-----------------------------------------------------------------

	# make this function's entry-point visible to the linker
	.global	expo


	# define stack-offsets for the function's two arguments
	.equ	N, 8
	.equ	K, 12


	.section	.text
expo:
	push	%ebp
	mov	%esp, %ebp

	push	%edx

	cmp	$0, K(%ebp)
	jne	recur

	mov	$1, %eax
	jmp	expox

recur:
	mov	K(%ebp), %eax
	dec	%eax

	push	%eax
	pushl	N(%ebp)
	call	expo
	add	$8, %esp

	mull	N(%ebp)
	
expox:
	pop	%edx

	pop	%ebp
	ret

	.end