This program is about stack frames.$$ This program has two functions: main$()$ and Add$5$Subtract$1().$ Both functions will setup and use a stack frame for local storage and passing parameters, as needed. $($That includes the location that you will scanf the input into!$)$

main$()$ will allocate space on the stack for $6$ integers.$$ Then it will prompt the user to enter each of $6$ integers. $$If the first one is Zero, then exit the program.$$ Hint:$$ These will be accessed use Index plus Displacement addressing mode using the FP as the index register $($aka FP relative$)!$

Once all $6$ integers have been entered, then setup and call printf with the following format string:

print$6$: $.$string $"$Now calling:$\backslash$tAdd$5$Subtract$1(\%$d$,\%$d$,\%$d$,\%$d$,\%$d$,\%$d $)$;

$"$

There are $7$ parameters.$$ R$0$ is the address of the formatting string.$$ The first $3$ parameters are in registers.$$ The last $3$ are on the stack.$$ To make this call, you need to allocate space for those $3$ parameters on the stack.$$ Those newly allocated locations will be accessed SP relative.$$ The input parameters from the scanf's will be accessed FP relative.$$ Clean up the stack $($Deallocated those $3$ words$)$ as soon as the printf returns.

$$

After the printf is completed, setup and call a function named Add$5$Subtract$1.$ Same process as above...different number of parameters.$$ Don't forget the Comment Block! Create this function to Add the first five parameters, then subtract the last.$$ Return that value.$$ It just does math, it does NOT print the results.$$ Leave print the result to main$().$

$$

Hints:

main$()$ will start out with space for $8$ values on the stack.$2$ to setup the stack frame $($STMDB$)$ and Plus $6$ more $($SUB #$6<<2)$ to hold the inputs.$$ Other than the LR$,$ no protected registers are used in this assignment.$$ The $6$ input locations will be accessed FP relative.$$ Then when you get ready to call printf you will allocate more space on the stack for parameters.$$ Those locations are accessed SP relative.$$Release that memory after printf finished.$$

Then setup the stack for the call to Add$5$Subtract$1.$Release that memory after Add$5$Subtract$1$ finished.$$ Use printf to print the results in main.

$$

This assignment had $4$ parts:

create main$().$ This function requires a stack frame.$$ It will get the $6$ parameters from the user

Arrange the format string address and those values into the $4$ registers and three on the stack and make the call to printf.$$ Note that R$0,$ the first parameter, holds the address of the format string.$).$

Then arrange those values into the $4$ registers and two on the stack and make the call to a function called: Add$5$Subtract$1.$ In main$(),$ print the results returned.

Create a function call Add$5$Subtract$1$ that added the first $5$ parameters and subtracted the $6$th$.$ This function requires a stack frame.

$$

Sample output:

Howard Miller $$CIST $039$

Enter the $1$st integer $(0$ to exit$)$: $1$

Enter the $2$nd integer: $2$

Enter the $3$rd integer: $3$

Enter the $4$th integer: $4$

Enter the $5$th integer: $5$

Enter the $6$th integer: $6$

Now calling: $$Add$5$Subtract$1(1,2,3,4,5,6)$;

The result is: $9$

Enter the $1$st integer $(0$ to exit$)$: $-1$

Enter the $2$nd integer: $-2$

Enter the $3$rd integer: $-3$

Enter the $4$th integer: $-4$

Enter the $5$th integer: $-5$

Enter the $6$th integer: $14$

Now calling: $$Add$5$Subtract$1(-1,-2,-3,-4,-5,14)$;

The result is: $-29$

Enter the $1$st integer $(0$ to exit$)$: $0$

$------------------$

$($program exited with code: $0)$

Press return to continue

Extra credit:

Do this assignment with single precision floating point numbers. Hint: printf can only print double precision, so you will need to convert each single to a double!$$ Then put$$ LOT of parameters for printf on the stack.$$ But Add$5$Subtract$1$ should accept and do math as single precision.