$!!!$THIS IS AN COMPUTER ARCHITECTURE$($CMPE$361$: Computer Organization$)$ LAB ASSAIGNMENT AND WILL BE SOLVED WITH MARS, MIPS SIMULATOR. I PUT THE THE DOCUMENTS NEEDS TO BE FILLED AND THE "task.asm" FILES AT THE END. THANK YOU IN ADVANCE!!

$1.$ Introduction

In this lab, you will get introduced to MARS, the MIPS simulator, by writing and executing relatively simple assembly programs. The Mars program is a combined assembly language editor, assembler, simulator, and debugger for the MIPS processor. It was developed by Pete Sanderson and Kenneth Vollmar at Missouri State University.

$2.$ Setup

$2\mathrm{.}1.$ Download MARS from LMS and uncompress it$.$ The package contains MARS$4\_5$ program and a tutorial. You need Java $($JVM$)$ to run it$.$ Go through the tutorial to learn details about MARS.

$2\mathrm{.}2.$ Double click$/$open the $$Mars$4\_5$ file. You shall see the following screen.

$3.$ Tutorial

$3\mathrm{.}1.$ Create a new file.

$3\mathrm{.}2.$ Save the file as $$code$1.$asm$.$

$3\mathrm{.}3.$ Copy the code from $$example$.$asm$($provided in the MARS.rar package$)$ and paste it in your $$code$1.$asm$$

$3\mathrm{.}4.$ Assemble the code $($i$.$e$.$ convert it into machine code$)$ by clicking $$assemble$$ button on tool bar. And Execute window will be opened if there are no errors in the code.

$3\mathrm{.}5.$ You can control the speed of execution through speed bar, run the whole program at once or do single step execution. You can also reset all the registers and memory to initial state by pressing reset button.

$3\mathrm{.}6.$ Notice that initially all registers $($except $gp$)$ and data segment $($i$.$e$.$ Data memory$)$ initially set to zero.

$3\mathrm{.}7.$ Press the single step button repeatedly to observe how execution of each instruction in the basic$/$source code affects the content of registers. Note that modified register$($s$)$ after each instruction are highlighted with the green color.

$4.$ Assignment

For Task $1$ to Task $3$ bellow, fill the table and answer the questions given in the $$submitFile$2$p$1.$docx$$ and submit to LMS$.$

Task $1$: $-40$ Points

$1.$ Open a new assembly file in MARS.

$2.$ Save it with the name of myTask$1.$asm.

$3.$ Copy the code provided in $$Task$1.$asm$$ file in LMS to your myTask$1.$asm.

$4.$ Single step through the code until it terminates and after execution of every instruction in the source code, fill the Table $1$ in $$submitFile$2$p$1.$docx$($given on LMS$)$ by writing name of registers and address of memory locations, and their values that are modified by a particular instruction.

Task $2$: $-40$ Points

$1.$ Open a new assembly file in MARS.

$2.$ Save it with name of myTask$2.$asm.

$3.$ Copy the code provided in $$Task$2.$asm$$ file in LMS to your myTask$2.$asm.

$4.$ Single step through the code until it terminates and after execution of every instruction in the source code, fill the Table $2$ in $$submitFile$2$p$1.$docx$($given on LMS$)$ by writing name of registers and address of memory locations, and their values, that are modified by a particular instruction.

Task $3$: $-20$ Points

$1.$ Open a new assembly file in MARS.

$2.$ Save it with name of myTask$3.$asm.

$3.$ Copy the code provided in $$Task$3.$asm$$ file in LMS to your myTask$3.$asm.

$4.$ Single step through the code until it terminates. The program terminates with an error. Explain the reason in $$submitFile$2$p$1.$docx$.$

We have to submit the work for Task $1$ to Task $3.$ Fill the tables and answer the questions in provided $$submitFile$2$p$1.$docx$$ file,

TASK FILES:

task$1.$asm:

$.$text

add $t$0,$ $$0,15$

sub $t$1,$ $t$0,2$

sw $t$1,0$x$10000000($$$0)$

lw $t$2,0$x$10000000($$$0)$

#The code written below is used to exit the program or terminate the execution

li $v$0,10$ # service $1$ is print integer

add $a$0,$ $t$0,$ $zero # load desired value into argument register $a$0,$ using pseudo$-$op

syscall

task$2.$asm:

$.$text

add $t$0,$ $$0,0$x$7$f$6$b$2684$

sub $t$1,$ $t$0,2$

sw $t$1,0$x$10000000($$$0)$

lb $t$2,0$x$10000002($$$0)$

#The code written below is used to exit the program or terminate the execution

li $v$0,10$ # service $1$ is print integer

add $a$0,$ $t$0,$ $zero # load desired value into argument register $a$0,$ using pseudo$-$op

syscall

task$3.$asm:

$.$text

add $t$0,$ $$0,0$xff$00$ff$00$

sw $t$0,0$x$10000002($$$0)$

#The code written below is used to exit the program or terminate the execution

li $v$0,10$ # service $1$ is print integer

add $a$0,$ $t$0,$ $zero # load desired value into argument register $a$0,$ using pseudo$-$op

syscall

HERE IS THE "submitFile$2$p$1.$docx" THAT NEEDS TO BE FILLED AND SUBMITTED: