# proc1.asm 
# MIPS program written to illustrate calling a procedure with register argument
# Susan Lincke
	.data
numbr:	.word	24
numad1:	.word	0
	.text   
	.globl main   
main:
	lw	$a0,numbr		# numad1 = increment(number)
	jal	incr
	sw	$v0,numad1
	li     	$v0, 10         	# exit
	syscall               		
######################################
# 	Increment(): Increments a number and returns it
#
# Arguments:  lw   $a0,number     #  increment(number)
#             jal  incr
#
# Stack usage: 0($sp) = return address
######################################
incr:					# $v0 = increment($a0=number)
	addi	$sp,$sp,-4		# stack.push(4)	
	sw	$ra,0($sp)		# stack[0] = return address
	addi	$v0,$a0,1		# return_value = number++
	lw	$ra,0($sp)
	addi	$sp,$sp,4		# stack.pop(4)
	jr	$ra			# return