CSC 3210 – Assignment #2 Solved

Objective: Learn memory organization/layout, data transfer concepts and instructions, direct memory access, memory allocation.
 
Requirements:
    1. (5 points) Implement the following expression in assembly language: 
                                                EDX = (val3 + val4) - (val2 - val1) - (5/3)*7
            ▪ Assume that val1, val2, val3 and val4 are 16-bit integer variables
            ▪ You need to implement the expression the way it is provided, you cannot do any reduction on the expression while implementing it.
    • Initialize val1 with 120 (hexadecimal), val2 with 39 (hexadecimal), val3 with 20 (hexadecimal) and val4 with 27 (hexadecimal)
    • You are NOT allowed to update the values of any variables.
            ▪ Use ONLY mov, add, sub, movzx, movsx, or neg instructions whenever needed.
            ▪ Use the debugger to verify your answer.

        ◦ Submit the following:
    •  Save your source code using your last name, Lastname1.asm and upload the Lastname1.asm 
    • Screenshot (showing the code and register window) of AX register contains the correct result. 
    2. (5 points) Implement the following expression in assembly language: 
                                                ECX = –(val3 + val1) + (-val4 – val2) + 3
            ▪ Assume that val1 is 8-bit variable, val2 is 16-bit variable, val3 is 32-bit variable, and val4 is 8-bit variable. 
            ▪ You need to implement the expression the way it is provided, you cannot do any reduction on the expression while implementing it.
            ▪ Initialize val1 with 12 (decimal), val2 with 9 (decimal), val3 with 2 (decimal), val4 with 20 (decimal),
            ▪ You are NOT allowed to update the values stored in val1, val2, val3 and val4
            ▪ Use mov, add, sub, movsx, movzx, or neg instructions whenever needed.
            ▪ Use the debugger to verify your answer.
            ▪ 

        ◦ Submit the following:
    •  Save your source code using your last name, Lastname2.asm and upload the Lastname2.asm 
    • Screenshot (showing the code and register window) of ECX register contains the correct result. 

    3. (5 points) Write an assembly program to compute the following expressions 

    • Create a DWORD array named ‘z’ of size 3 using DUP operator. Leave the array ‘z’ uninitialized. You can denote the items in the array as [, where  is the first item, is the second item,   is the third item
    • Update each array item using the following expressions.
 
                                                 
 
 
                                                                  

    • Where x, y, r are 16-bit integer memory variables. 
    • x = 10, y = 15, r = 4
    • Use mov, movzx, movsx, add, sub instructions only. 
    • (hint: Do not alter the value of x, y and r during the computation. Transfer them to appropriate registers to do computation)
    • At the end, open memory window to see the variable z stored in memory (little endian format).
    • Use the debugger to verify your answer.
        ◦ Submit the following:
            ▪ Rename the asm file using your last name as Lastname3.asm 
            ▪ Screenshot of the code and memory window showing the content of the variable z (little endian format).

Note:
    • Submit your source code by only uploading .ASM file using iCollege in the respective assignment dropbox:
    • Lastname1.ASM, Lastname2.ASM, Lastname3.ASM
    • Put the following information as Comment header for .ASM files:
            Student: Full name
            Class: CSC3210
            Assignment#: 2 
               Description: This program ………….
    • Follow the program standards as presented in your book. Pay more attention to code comments and 
         consistent indentation.