Answered: 6) Write code using byte operands that…

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...

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Transcribed Image Text:**Question 6:** Write code using byte operands that adds two negative integers and causes the Overflow flag to be set. **Explanation:** In this problem, you are instructed to write a piece of code that uses byte-sized operands to add two negative integers. The goal is to set the Overflow flag, which typically indicates that the sum of the two operands exceeds the representational limits of the byte data type, causing a wrap around. When working with 8-bit signed integers (a byte), remember that the values range from -128 to 127. Adding two negative values within this range can cause an overflow if their sum is less than -128. **Example Code (in Assembly Language):** ```assembly section .data a db -100 ; Define first negative integer b db -30 ; Define second negative integer section .text global _start _start: mov al, a ; Move the first negative integer into the AL register add al, b ; Add the second negative integer ; The Overflow flag (OF) will be set if the result exceeds the limits of a signed byte ; You can check for the Overflow flag here and handle the overflow situation as needed ; Exit the program (specific to Linux x86 syscall) mov eax, 60 ; syscall: exit xor edi, edi ; exit code 0 syscall ``` **Note:** 1. The `db` directive in the data section defines the values `a` and `b` as byte-sized data. 2. The `mov` instruction loads the value of `a` into the `AL` register, and the `add` instruction adds the value of `b` to `AL`. 3. The processor automatically sets the Overflow flag if an overflow occurs during the addition. 4. The code example provided includes syscalls specific to exiting on a Linux x86 system. Depending on the context, the code might vary slightly. This example is written in x86 Assembly language, as it is a common choice for demonstrating low-level operations directly related to processor flags.

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