Question

Step 1. Write a program in assembly language (using macros) to print out the following messages on the screen [20 marks]:

Hello, programmers! Welcome to the world of, Linux assembly programming!

Step 2. Write a C function to passed two numbers to the function and calculate the sum of all the numbers between them (both inclusive). [50 marks]

a. Make a version with for loop
b. Make a version with while loop

c. Make a version with do.. while loop d. Make a version with goto loop

Tip : Try to use the same number of variables and almost the same logic in all the four loops

To do:
Using the command

$gcc -O1 -S filename.c

Will generate the assembly version of the loop. Now you need to analyze and compare them. Are these codes same or different? If different, identify the differences

Step 3. Optimize the code for summing an array of 50 elements using loop unrolling. Run and generate the graph of performance improvement. [30 marks]

Submission:

A. Make a word document with only the assembly code generated from the programs

B. Compare and contrast different versions of loops written in assembly for Step 2 Comparison should be done based on:
a. Number of registers used
b. Number of jumps (iterations)

c. Total number of operations
C. Submit the word document to the Open Learning Faculty Member for grading.

Answer 1

`Hey,

Note: Brother if you have any queries related the answer please do comment. I would be very happy to resolve all your queries.

1)

; A macro with two parameters
; Implements the write system call
%macro write_string 2
mov eax, 4
mov ebx, 1
mov ecx, %1
mov edx, %2
int 80h
%endmacro

section   .text
global _start ;must be declared for using gcc
  
_start: ;tell linker entry point
write_string msg1, len1   
write_string msg2, len2
write_string msg3, len3
  
mov eax,1 ;system call number (sys_exit)
int 0x80 ;call kernel

section   .data
msg1 db   'Hello, programmers!',0xA,0xD   
len1 equ $ - msg1          

msg2 db 'Welcome to the world of,', 0xA,0xD
len2 equ $- msg2

msg3 db 'Linux assembly programming! '
len3 equ $- msg3

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Thanks.