Question

Assembly Programming in MIPS

Write a program in MIPS assembler that performs the following computations:

1. Prompts the user to enter two integers and stores the smaller one in the first data memory word (with the lowest address) and the larger one in the second data memory word.
2. Then divides the larger word by the smaller one in integer and stores the integer quotient in the third data memory word and the remainder in the fourth data memory word.
3. Finally, it prints the four data memory words on separate lines each starting with a label (fist integer, second integer, quotient, remainder).

Requirements and restrictions

1. Use integer arithmetic only.
2. Include at least one instruction from each instruction type: R-type arithmetic, I-type arithmetic, Memory transfer (lw, sw) and Branch (beq, bne).
3. Use input and output through system calls including print string for prompting the user and printing labels.
4. Do NOT use pseudo-instructions or non-machine level instructions. The program must load and run with "Allow pseudo instructions" unchecked (in Simulator/Settings).
5. For each instruction Include as comment in the source file: its type, format and meaning in the program.
6. Use the SPIM simulator to run the program.

Answer 1

MEMORY ADDRESS   MNEMONICS   COMMENT
2000   LDA 2050   A<-[2050]
2003   MOV H, A   H<-A
2004   LDA 2051   A<-[2051]
2007   DIV B   B <-A/H
2008 QUT C C <- A%H

.data #Section that declares variables for program
firstPromptString: .asciiz "first integer"
SecondromptString: .asciiz "second integer"
quotientromptString: .asciiz "quotient integer"
remainderromptString: .asciiz "remainder integer"

firstPromptString : A
SecondromptString : H
quotientromptString: B
remainderromptString: C