added

.text

main:

	li $a0, 10

	jal fact

	move $s0, $v0

	li $v0, 10

	syscall		# exit

fact:

	addi 	$sp, $sp, -12	# allocate stack

	sw 	$ra, 4($sp)

	sw	$a0, 0($sp)	# setup stack, 8($sp) is un-initialized

	ble	$a0, 1, L1	# if a0 <= 1, goto L1

				# else recurse

	addi 	$a0, $a0, -1		

	jal	fact		# find fact (a0 - 1)

	lw	$a0, 0($sp)	# get our a0 back

	mul	$t0, $v0, $a0	# t0 = a0 * fact (a0 - 1)

	sw	$t0, 8($sp)	# store t0 into our local variable on the stack

	j	return

L1:

	li 	$t0, 1		# setup a register with 1	

	sw	$t0, 8($sp)	# store 1 into our local variable

				# fall through to the return

return:

	lw	$v0, 8($sp)	# load return value from the local variable

	lw	$ra, 4($sp)	# load the return address

	addi	$sp, $sp, 12	# pop stack

	jr 	$ra		# return

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