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Lab 3: MIPS!

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Lab 3: MIPS!
Lab Objective
This lab will introduce you to the MIPS ISA using MARS. You will write a program that
calculates the factorial of an integer between 0 and 10.
Lab Preparation
Read chapters 1 (section 1.3), 2, 3, and 7 from Introduction To MIPS Assembly
Language Programming. In addition, watch videos 2-3 and 19 from this video playlist:

FuNa5A
Specification
You will write a program in the MIPS32 language using the MARS integrated development
environment to calculate the factorial of a number.
Example Outputs
Enter an integer between 0 and 10: 11
Invalid entry!
Enter an integer between 0 and 10: 0
0! = 1
— program is finished running —
Enter an integer between 0 and 10: 10
10! = 3628800
— program is finished running —
For full credit, the output should match this format exactly. Take
note of the:
Lab 2 Page 1 of 4 Spring 2019
© 2019, Computer Engineering Department, University of California – Santa Cruz
1. Exact wording of the prompts
2. Space after each colon
3. Space before and after the equal sign
4. New line character after the prompt
5. New line character after the error message
6. New line character after the final result
Functionality
This program will prompt the user for an integer between 0 and 10 and calculate the
factorial. If the user enters a number outside of the acceptable range, the program
must notify the user, and prompt the them again for an integer. You may assume that
the grading script will only provide decimal integer inputs that can be stored in 32
bits.
The ASCII values for the characters you will be printing are here:
CHARACTER ASCII CODE (HEX)
! 0x21
= 0x3D
(space) 0x20
Table: ASCII Codes
Syscalls
You must use the following syscalls for their specified purposes as shown below:
SYSCALL # FUNCTION PURPOSE
1 Print integer Print integers
4 Print string Print prompt and error message
5 Read integer Read user input
10 Exit Exit your program cleanly
11 Print character Print exclamation point, spaces, and equal sign in
answer printout
Table: Required Syscalls
Automation
Note that part of our grading script is automated, so it is imperative that
your program’s output matches the specification exactly. Output that
deviates from the spec will cause point deduction.
Your code should end cleanly without error. Make sure to use the exit syscall
(syscall 10).
Lab 2 Page 2 of 4 Spring 2019
© 2019, Computer Engineering Department, University of California – Santa Cruz
Files
Lab3.asm
This file contains your code.
Follow the code documentation guidelines here. Make sure to include a header comment
and pseudocode.
README.txt
This file must be a plain text (.txt) file. For full credit, it should contain your
first and last name (as it appears on Canvas) and your CruzID. Your answers to the
questions should total at least 150 words. Your README should adhere to the following
template:
————————
Lab 3: MIPS!
CMPE 012 Winter 2019
Last Name, First Name
CruzID
————————-
The text of your prompts are stored in the processor’s memory. After
assembling your program, what is the range of addresses in which these strings
are stored?
Write the answer here.
What were the learning objectives of this lab?
Write the answer here.
Did you encounter any issues? Were there parts of this lab you found
enjoyable?
Write the answer here.
How would you redesign this lab to make it better?
Write the answer here.
What external resources did you use to complete this lab?
(Not including course materials)
Write the answer here.
Did you work with anyone on the labs? Describe the level of collaboration.
Write the answer here.
Lab 2 Page 3 of 4 Spring 2019
© 2019, Computer Engineering Department, University of California – Santa Cruz
Grading Rubric
point values to be determined
assembles without errors
output matches the specification
format of prompt
format of error message
format of final result
final result
print character syscall (11)
exit syscall (10)
5 pt documentation
1 pt complete header comments in code and README
1 pt useful & sufficient comments
1 pt comment on register usage
1 pt clean visual structure / use of white space
Note: line up instructions, operands, and comments using spaces
indent code from labels
2 pt readme file complete (should total at least 150 words)
Lab 2 Page 4 of 4 Spring 2019
© 2019, Computer Engineering Department, University of California – Santa Cruz

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