COMPUTER SCIENCE

1. For each instruction, give the 80x86 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.