Homework Help is Here – Start Your Trial Now!
Engineering
Computer Engineering
Modify the Extended_Add procedure add two 256-bit (32-byte) integers.

Modify the Extended_Add procedure add two 256-bit (32-byte) integers.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
See similar textbooks
icon
Related questions
Question

Modify the Extended_Add procedure add two 256-bit (32-byte) integers.

### Assembly Code Explanation This assembly code snippet demonstrates a sequence of operations manipulating bytes and flags, often used for arithmetic operations and flag management. #### Data Section: - **val1 BYTE '8'**: Stores the ASCII character '8'. - **val2 BYTE '9'**: Stores the ASCII character '9'. #### Code Section: 1. **mov ah,0**: Initializes the `AH` register to 0. - *Comment: `AX` = 0038h* 2. **mov al,val1**: Loads the ASCII value of '8' into the `AL` register. - *Comment: Not explicitly listed but affects subsequent operations.* 3. **sub al,val2**: Subtracts the ASCII value of '9' from `AL`. - *Comment: `AX` = 00FFh* 4. **aas**: ASCII adjust AL after subtraction; corrects the result in `AL` for BCD operations. - *Comment: `AX` = FF09h* 5. **pushf**: Pushes the current state of the flags register onto the stack. - *Comment: Save the Carry flag* 6. **or al,30h**: Performs a bitwise OR operation on `AL` with the hexadecimal value 30h. - *Comment: `AX` = FF39h* 7. **popf**: Restores the flags register from the stack. - *Comment: Restore the Carry flag* This code snippet demonstrates basic ASCII arithmetic, binary-coded decimal (BCD) adjustment, and flag manipulation, which are foundational concepts in assembly language programming. Understanding these operations is crucial for controlling low-level machine behavior, especially in contexts requiring direct hardware interaction or performance optimizations.
Transcribed Image Text:### Assembly Code Explanation This assembly code snippet demonstrates a sequence of operations manipulating bytes and flags, often used for arithmetic operations and flag management. #### Data Section: - **val1 BYTE '8'**: Stores the ASCII character '8'. - **val2 BYTE '9'**: Stores the ASCII character '9'. #### Code Section: 1. **mov ah,0**: Initializes the `AH` register to 0. - *Comment: `AX` = 0038h* 2. **mov al,val1**: Loads the ASCII value of '8' into the `AL` register. - *Comment: Not explicitly listed but affects subsequent operations.* 3. **sub al,val2**: Subtracts the ASCII value of '9' from `AL`. - *Comment: `AX` = 00FFh* 4. **aas**: ASCII adjust AL after subtraction; corrects the result in `AL` for BCD operations. - *Comment: `AX` = FF09h* 5. **pushf**: Pushes the current state of the flags register onto the stack. - *Comment: Save the Carry flag* 6. **or al,30h**: Performs a bitwise OR operation on `AL` with the hexadecimal value 30h. - *Comment: `AX` = FF39h* 7. **popf**: Restores the flags register from the stack. - *Comment: Restore the Carry flag* This code snippet demonstrates basic ASCII arithmetic, binary-coded decimal (BCD) adjustment, and flag manipulation, which are foundational concepts in assembly language programming. Understanding these operations is crucial for controlling low-level machine behavior, especially in contexts requiring direct hardware interaction or performance optimizations.
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Recommended textbooks for you
Computer Networking: A Top-Down Approach (7th Edi…
Computer Networking: A Top-Down Approach (7th Edi…
Computer Engineering
ISBN:
9780133594140
Author:
James Kurose, Keith Ross
Publisher:
PEARSON
Computer Organization and Design MIPS Edition, Fi…
Computer Organization and Design MIPS Edition, Fi…
Computer Engineering
ISBN:
9780124077263
Author:
David A. Patterson, John L. Hennessy
Publisher:
Elsevier Science
Network+ Guide to Networks (MindTap Course List)
Network+ Guide to Networks (MindTap Course List)
Computer Engineering
ISBN:
9781337569330
Author:
Jill West, Tamara Dean, Jean Andrews
Publisher:
Cengage Learning
Concepts of Database Management
Concepts of Database Management
Computer Engineering
ISBN:
9781337093422
Author:
Joy L. Starks, Philip J. Pratt, Mary Z. Last
Publisher:
Cengage Learning
Prelude to Programming
Prelude to Programming
Computer Engineering
ISBN:
9780133750423
Author:
VENIT, Stewart
Publisher:
Pearson Education
Sc Business Data Communications and Networking, T…
Sc Business Data Communications and Networking, T…
Computer Engineering
ISBN:
9781119368830
Author:
FITZGERALD
Publisher:
WILEY
SEE MORE TEXTBOOKS