Below is the main function for this assignment. Copy this into your file to start and change Name to your name. Stubs have been added for some of the functions so it will assemble.

CSE/EEE 230 

Assignment 3

Due February 26, 3PM

Below is the main function for this assignment.  Copy this into your file to start and change Name to your name.  Stubs have been added for some of the functions so it will assemble.

.data num1: .word 0 num2: .word 0

text1: .asciiz “\nProduct ” name: .asciiz “\nName” endline: .asciiz “\n”

.text

.globl main

main:

	lui $a0, 0x1001	# get start of data
	addiu $a0, $a0, 0x0012	# get start of name
	andi $a2, $a0, 0		# set flag to false
	jal print		# print name
	ori $s0, $0, 5		# repeat 5 times
top:	beq $s0, $0, end		# if counter is zero, stop loop
	lui $a0, 0x1001		# set address of first word
	addiu $a1, $a0, 4		# set address of second word
	jalgetinput		# call function to get input, store into memory
	lui $t0, 0x1001		# get address of first word
	lw $a0, 0($t0)		# get the first value from memory
	lw $a1, 4($t0)		# get the second value from memory
	jal multiply		# multiply the values, result in $v0
	addi $a1, $v0, 0		# get value to print from $v0
	lui $a0, 0x1001		# get start of data section
	addi $a0, $a0, 8		# get start of product output string
	ori $a2, $0, 1		# set flag to true
	jal print		# print result
	addi $s0, $s0, -1		# decrement counter
	j top		# repeat
end: ori $v0, $0, 10		# set command to stop program,
syscall
getinput: jr $ra	#stub
print: jr $ra	#stub
multiply: jr $ra	#stub

You are to complete the program by writing four functions.  Pay particular attention to the purpose of each function, what registers to use and how the parameters and stack are to be used.  If the instructions specify a particular register, then you must use it.

1. print

                                  $a0 – address of a string to print

                                   $a1 – value of an integer value to print

                                   $a2 – boolean value (1 or 0)

This function must first print the string, then if $a2 holds a 1 (true) print the integer.  Both outputs must be on the same line. End the output with a newline.  

• multiply

                                   $a0 – first integer

                                   $a1 – second integer

                                   $v0 – first integer * second integer

This function is to calculate and return the result of multiplying the arguments together. You may assume that both arguments are greater than zero.  As multiplication is really repeated addition, you can calculate the result by adding and using a loop.  Using a version of the mult instruction is NOT ACCEPTABLE.

• getpos 

                                   $a0 – prompt

                                   $v0 – positive integer input

This function will print the prompt string by calling the print function (above) and then get input from the user.  This process is repeated until a value greater than zero is input.  The value is then returned in $v0.  As this function calls another function so you MUSTsave the $ra on the stack (not into another register).

• getinput

                                  $a0 – address to store the first value

                                   $a1 – address to store the second value

This function must call the getpos function two times and store each return value into the memory locations given in $a0 and $a1.  As this function calls another function so you MUST save the $ra on the stack (not into another register).

General:

1. Do not use pseudo-instructions.  
2. All calls to the functions must be done through jal and returns through jr.
3. Your code must be documented for each function.  Describe which registers are used in the function and how they are used.

Submit your file with the complete program.

 

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