Objective of this lab:

        To investigate the use of the hardware stack. You will write push and
        pop operations directly into a spim program.

        To design and use m4 macros in a spim program. You will learn how to
        generalize and reuse code like the push and pop operations.

Preparation

	Read lab lecture notes.

Lab Assignment

Assignment#1: Using the Stack

1. Prompt the user to enter 5 integers.
2. Print the integers in reverse order using only the stack.
• You may use any string printing macros you wish from printLib.m4
• Please try to use appropriate control structures.
3. Your output should resemble the following:

   Please enter 5 integers:
   1
   2
   3
   4
   5
   
   Here are the numbers you entered in reverse order:
   5
   4
   3
   2
   1
   

Assignment#2: Writing and Using Macros

1. Extend printLib.m4 to include integer reading and printing macros.
   They need to have the following features:
   • Take one parameter that represents the source or destination register respectively.
   • Both macros should have a header that clearly indicates the purpose of the macro and what registers are modified.
2. Write a new macro library called macroOps.m4 that contains two macros: push and pop. They must:
   • Take one argument that represents the source or destination of the operation.
   • Adjust the stack pointer, $sp, appropriately.
   • Store the contents of the source register on the stack if appropriate.
   • Have a header that describes its use and effects.
3. Copy reverse.s to reverseMac.m4 and modify it to use the macros you just defined.
   Necessary steps include:
   • include printLib.m4 and macroOps.m4
   • make changes and process macros using:

     m4 reverseMac.m4 > reverseMac.s
     

You will hand in the following:

1. The source code in the files printLib.m4, stackOps.m4, reverse.s, reverseMac.m4, and reverseMac.s
2. For each of reverse.s and reverseMac.s
• The print out of the screen shot (print screen) to show the program has been successfully loaded
• The print out of the screen shot of the console dislaying the results.

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