Posted: February 28th, 2022

COMPUTER SCIENCE essay

1. For each instruction, give the 80×86 opcode and total number of bytes of object code, including prefix bytes. Assume you are in 64-bit mode and that word0p, dbl0p, and quad0p reference a word, doubleword and quadword in data, respectively.

Add ax, word0p
Sub dbl0p, ebx
Sub rax, 10
Add quad0p, 1000
Inc r10b
Dec word0p
Neg rdx
Inc QWORD PTR [rdx]
2. Please provide code converting a Fahrenheit to a Celsius using the registers edx and eax?

3. Please write the commands (declarations) to setup a 2-byte and 4-byte GPS location.

4. Is the following code valid? Why or why not:

mov eax, [ebx-ecx] ;
mov [eax+esi+edi], ebx ;
cmp eax, edx ;
xor ecx, ecx ;
inc eax ;
5. What does the following code do?

Push ebp ;
Mov ebp, esp ;
Push ebx ;
6. Please provide code for the following scenario:

Create a while loop that that checks for 4 iteractions
Create jumps and labels for each case
Provide an exitcode along with possible return codes.

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