CSC3210 – Assignment 3 Solved

Objective: Learn memory organization/layout, data transfer concepts and instructions, direct memory access, memory allocation. 

  

Requirements: 

1.       (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 [𝑧!, 𝑧", 𝑧#], where 𝑧! is the first item, 𝑧"   is the second item,  𝑧# is the third item 

-          Update each array item using the following expressions. 

  
                                                𝑧! = 𝑥 + 130  

𝑧" = 𝑦 + 𝑥 −        𝑧!  

𝑧# = 𝑟 + 𝑥 − 13  


-          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). - If you code correctly, 𝑧! = 140 in decimal,  𝑧" = −115   in decimal, 𝑧# = 1            in decimal 

-          Use the debugger to verify your answer. 

o    Submit the following: 

§   Rename the asm file using your last name  as Lastname1.asm  

§   Screenshot of the code and memory window showing the content of the variable z (little endian format). 

 

 

2.       (5 points) Use a loop instruction with indirect addressing to solve the problem.  

-          Do not copy the elements to any other array.  

-          Use the LOOP and XCHG instruction. 

-          The input array, inputStr contains elements: “A”, “B”, “C”, “D”, “E”, “F”, “G”, “H”. 

-          The array’s elements after running the program should look like: “H”, “G”, “F”, “E”, “D”, “C”, “B”, “A”. 

o    Submit the following: 

§   Rename the asm file using your last name as Lastname2.asm  

§   Screenshot of the code and memory window showing the content of the variable inputStr. 

 

 

3.       (5 points) Write an assembly program that does the following:   

-          Define the following value 0506030704080102h in the .data segment using the 64-bit unsigned identifier named qVal.  

-          You can subdivide the qVal value into 4 words – 0506, 0307, 4080, 0102 - Extract these words from qVal using PTR operator.  

-          Find the sum of the words. The sum should be D17h.  

-          Store the result in any 16-bit register.  

-          The direction of adding two words goes from left to right. 

o    Submit the following: 

§  Rename the asm file using your last name as Lastname3.asm  

§  Screenshot of the code and memory window showing the result in a 16-bit register. 


Note: 

§  Comment header for .ASM files: 

                               Student: Full name 

                               Class: CSC3210 

                               Assignment#: 3 

                               Description: This program …………. 

§  Follow the program standards as presented in your book. Pay more attention to code comments and           consistent indentation.  

§  Create a new project for every question. Do not use one project with multiple .asm files.