Please help with ARM implementation for this C program for computer organization class:

Given the following C program and the mapping of registers to variables, complete the ARM 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

X$19$ x

X$20$ y

X$21$ w

X$22$ z

Hint: Use X$0,$ X$1$ as arguments and X$2$ as return value, according to the convention for procedure calling.

Ex: If the values of X$19$ and X$20$ are initialized in the simulator as:

Registers Data

X$195$

X$2010$

the results are stored in X$21$ and X$22$:

Registers Data

X$195$

X$2010$

X$2115$

X$225$

Note: Use the $\text{'}+\text{'}$ button under the Registers display to initialize register values for X$19$ and X$20.$

Assembly

Main:

$//$ Type your code here.

B End

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

Sum:

ADD X$2,$ X$0,$ X$1$

BR X$30$

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

Dif:

SUB X$2,$ X$0,$ X$1$

BR X$30$

End: