Assignment #3

Description

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

1. • 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

1. • Update each array item using the following expressions.

_! = +130

_“=+−_!

_#= + −13

1. • Where x, y, r are 16-bit integer memory variables.

1. • x = 10, y = 15, r = 4

1. • Use mov, movzx, movsx, add, sub instructions only.

1. • (hint: Do not alter the value of x, y and r during the computation. Transfer them to appropriate registers to do computation)

1. • At the end, open memory window to see the variable z stored in memory (little endian format).

   • If you code correctly, _! = 140 in decimal, _“ = −115 in decimal, _# = 1 in decimal

   • Use the debugger to verify your answer. o Submit the following:

1. • • • 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.

1. • 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:

1. • • 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:

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

1. • You can subdivide the qVal value into 4 words – 0506, 0307, 4080, 0102

1. • Extract these words from qVal using PTR operator.

1. • Find the sum of the words. The sum should be D17h.

1. • Store the result in any 16-bit register.

1. • 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.