COMP 2033, Spring 2018 Homework 4 Instructor: Dr. Ahmed Abdelmoamen Ahmed Due: 0

Question

COMP 2033, Spring 2018 Homework 4 Instructor: Dr. Ahmed Abdelmoamen Ahmed Due: 04/23/2018 at 11:55 PM Marks: 100 points Submission Instructions: 1. Upload your asm files to eCourse in a zip file. 2. Please include a readme file that has (i) your name and student ID; and (ii) detailed instructions on how to run your programs. 3. Must receive instructor's approval in advance if an alternative time and method of submission becomes necessary. Solve each of the following problems. To receive full marks on your documentation, you should have excellent internal documentation i.e., appropriate comments, but also choice of variable names), as well as excellent external documentation (i.e., in the readme.txt file as described previously). [30 points] Code instructions that implement the following pseudocode using conditional jump instructions. Do not use the IF directive. Assume that integers are unsigned: 1. dl5 else 2. [30 points] Code instructions that implement the following pseudocode using conditional jump instrutins. Do not use .WHILE or IF directives. Assume that integers are unsigned: while( int2>intl) ebx +m 2; if ebx> int2) ebx0; else ebxintl; 3. [40 points] Suppose EAX, EBX, and ECX contained three unsigned integers. Write a program that displays the largest of the three integers using conditional jump instructions.

Explanation / Answer

section .text

global _start

_start:

movl $1,%eax

movl $2,%ebx

movl $3,%ecx

movl $4,%edx

movl $5,%esi

movl $6,%edi

pushad

movl $6,%ebx

movl $0,%ecx

LOOP_OUTER:

cmp ecx,ebx

jz exit

pop eax

xorl %esi, %esi

loop:

movl $0, %edx

movl $10, %ebx

divl %ebx

addl $48, %edx

pushl %edx

incl %esi

cmpl $0, %eax

jz next

jmp loop

next:

cmpl $0, %esi

jz exit

decl %esi

movl $4, %eax

movl %esp, %ecx

movl $1, %ebx

movl $1, %edx

int $0x80

addl $4, %esp

jmp next

addl $1,%ecx

jmp LOOP_OUTER

exit:

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