COE $224$: Computer Organization and Architecture I

LAB $8$: Procedures$/$Functions

Objectives

To learn and practice writing procedures$/$functions in MIPS instruction set and the different ways of passing the parameters.

Requirements:

A desktop or laptop computer.

Download the SPIM simulator $($QtSpim$).$

Background:

Read and exercise Section $8\mathrm{.}0$ Procedures$/$Functions on Pages $67-83$ in the Lab$-$Manual: "MIPS Assembly Language Programming using QtSpim$$ By Ed Jorgensen, Ver $1\mathrm{.}1\mathrm{.}14,$ Jan $2016.$

Simulation:

Write and simulate a MIPS assembly$-$language routine that uses a procedure called LISTADD to add the elements of an integer array. The array, along with its length, is stored in memory words. Use the array: $23,-2,45,67,89,12,-100,0,120,6.$ The arguments passed to LISTADD are the base address of the array $($passed through register $$a0)$ and the length of the array $($passed through register $a$1).$ The procedure LISTADD returns the result in register $$v0.$ The main procedure saves the result in memory and prints it on console preceded by an appropriate text message. Procedure call should look like the following:

Results:

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