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Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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**Title: Understanding the Differences Between .data and .text Sections in Program Files**

---

**Text:**

"Explain and compare .data and .text."

---

**Explanation:**

The .data and .text sections are crucial components of a program file, often found in compiled executables, particularly in the context of assembly language or low-level programming. Here’s a detailed comparison:

1. **.data Section**:
   - **Purpose**: The .data section stores initialized global and static variables that the program uses. These variables have predefined values that are explicitly specified in the source code.
   - **Characteristics**: The data in this section is readable and writable. During the execution of the program, the variables in the .data section can be modified.
   - **Example**: Suppose a program has a global integer variable initialized to 10. This would be stored in the .data section.

2. **.text Section**:
   - **Purpose**: The .text section contains the executable code of the program. This includes the instructions that the CPU executes to perform the program's tasks.
   - **Characteristics**: The content in the .text section is read-only. Modifying the instructions during execution is generally restricted and requires specific permissions to avoid accidental corruption or malicious exploits.
   - **Example**: All the function definitions, including their sequences of instructions, are stored in the .text section.

**Conclusion:**

Understanding the distinction between the .data and .text sections is essential for low-level programming and debugging. The .data section houses mutable initialized data, whereas the .text section encapsulates the immutable executable code. This separation helps manage memory and protect critical code from unintended changes.
Transcribed Image Text:**Title: Understanding the Differences Between .data and .text Sections in Program Files** --- **Text:** "Explain and compare .data and .text." --- **Explanation:** The .data and .text sections are crucial components of a program file, often found in compiled executables, particularly in the context of assembly language or low-level programming. Here’s a detailed comparison: 1. **.data Section**: - **Purpose**: The .data section stores initialized global and static variables that the program uses. These variables have predefined values that are explicitly specified in the source code. - **Characteristics**: The data in this section is readable and writable. During the execution of the program, the variables in the .data section can be modified. - **Example**: Suppose a program has a global integer variable initialized to 10. This would be stored in the .data section. 2. **.text Section**: - **Purpose**: The .text section contains the executable code of the program. This includes the instructions that the CPU executes to perform the program's tasks. - **Characteristics**: The content in the .text section is read-only. Modifying the instructions during execution is generally restricted and requires specific permissions to avoid accidental corruption or malicious exploits. - **Example**: All the function definitions, including their sequences of instructions, are stored in the .text section. **Conclusion:** Understanding the distinction between the .data and .text sections is essential for low-level programming and debugging. The .data section houses mutable initialized data, whereas the .text section encapsulates the immutable executable code. This separation helps manage memory and protect critical code from unintended changes.
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