Requirements: 1· (8 points) Write a program that clears the screen and prompts t

Question

Requirements: 1· (8 points) Write a program that clears the screen and prompts the user to enter three signed integers Enter Signed Integer: Assign those values to val2, val3, and val4 - vall, val2, val3 and val4 are 32-bit memory signed integers - Pass those values to a subroutine that implements the following expression vall -(val2 val3) * (val4 / val2) +(val3 * 3) To access the values in the caller frame, use EBP (remember EBP is created at the callee side) The calculated expression result needs to be assigned to vall at the caller side. The calculated expression result needs to be displayed on console screen from main subroutine Name the subroutine IntegerArithmeticProc. When calling or creating the Integer ArithmeticProc subroutine, you are not allowed to use any of the following directives: invoke, addr, proc with lists, and proto or proto with lists Use the appropriate multiplication and division instructions Use the CBW, CWD, or CDQ instructions when needed. For (val3 *3), you must use the instruction of the two operands format Run your program using the debugger to verify your answers Use Step Into instead of Step Over to keep track of the stack, ESP, EBP, EIP during debugging. To access the stack memory, copy the value of ESP from the register window and past it in the search text box in the memory window. *

Explanation / Answer

Code:

DATA SEGMENT

msg1 DB "Enter Signed integers:"

val1 DW ?

val2 DW ?

val3 DW ?

val4 DW ?

CODE SEGMENT

mov ax,@data ;get data segment address

mov ds,ax ;initialize ds

;set the cursor position to the middle of the screen(25rowsx80columns)

MOV ah, 2

MOV bh, 1 ; page number

MOV dh, 12 ; middle row

MOV dl, 40 ; middle column

INT 10h

LEA DX, msg1 ; prompt user for input

MOV AH, 9

INT 21H

MOV ah, 1

INT 21h

MOV val2,AL

MOV ah, 2

INT 21h

MOV val3,AL

MOV ah, 3

INT 21h

MOV val4,AL

MOV EAX, val1 ; save final result in eax

; push parameters onto the stack from right to left

PUSHL val4

PUSHL val3

PUSHL val2

CALL IntegerArithmeticProc

STORE EAX, val1 ; Store final output in val1

IntegerArithmeticProc:

PUSH EBP

MOV EBP, ESP

MOV EBX, [EBP+8] ; EBX = val4

MOV ECX, [EBP+12] ; ECX = val3

MOV EDX, [EBP+16] ; EDX = val2

DIV EBX, EDX ; EBX = EBX/EDX = val4/val2

SUB EDX, ECX ; EDX = EDX-ECX = val2-val3

MULTI ECX, #3 ; ECX = ECX *3 = val3*3

MULTI EDX, EBX

SUB EDX, ECX

MOV EAX, EDX ; Final result in EAX

MOV ESP, EBP

POP EBP

RET ; Return

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