Please fix code from main section below. Must work with code from other sections unaltered. Pay attention to comments and ONLY alter main section code.

Problem:

Given the following C program and the mapping of registers to variables, complete the MIPSzy implementation of Main. Do not implement return $0$; in main$().$

int Dif$($int a$,$ int b$)\{$

return a $-$ b;

$\}$

int Sum$($int a$,$ int b$)\{$

return a $+$ b;

$\}$

int main$()\{$

int x$,$ y;

w $=$ Sum$($x$,$ y$)$;

z $=$ Dif$($y$,$ x$)$;

return $0$; $//$ Do not implement

$\}$

Registers Variables

$t$0$ x

$t$1$ y

$t$2$ w

$t$3$ z

Hints: Use program stack to pass arguments, return values, and preserve saved registers. Remember to pop the stack after each function returns.

Ex: If the values of $t$0$ and $t$1$ are initialized in the simulator as:

Registers Data

$t$05$

$t$110$

the results are stored in $t$2$ and $t$3$:

Registers Data

$t$05$

$t$110$

$t$215$

$t$35$

Note: Use the $\text{'}+\text{'}$ button under the Registers display to initialize register values for $t$0$ and $t$1.$

Code:

addi $sp$,$ $zero, $8188$ # Assume program stack starts at $8188.$ Do not modify.

# Procedure Main $($Only modify this$)$

Main:

# Procedure Sum $($Do not modify$)$

Sum:

lw $t$0,8($$sp$)$

lw $t$1,4($$sp$)$

add $t$2,$ $t$0,$ $t$1$

sw $t$2,0($$sp$)$

jr $ra

# Procedure Dif $($Do not modify$)$

Dif:

lw $t$0,8($$sp$)$

lw $t$1,4($$sp$)$

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

sw $t$2,0($$sp$)$

jr $ra

End: