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Creating Linux Executables from NASM Source Code

(NASM), a versatile assembler and disassembler, is a vital tool for Intel x86 architecture programming. It's widely adopted for crafting programs in 16-bit, 32-bit (IA-32), and 64-bit (x86-64) formats. This guide focuses on creating Linux executables from NASM source code. The process involves translating low-level mnemonics into machine language, understandable by processors.

Steps to Create Executable:

Step 1: Source File Creation

1. Open your preferred text editor (e.g., Sublime, Atom, KWrite, XEmacs).

2. Compose your NASM source code.

3. Save the file with the .asm extension.

Step 2: Assemble Source File

1. Ensure NASM is installed on your machine.

2. If on Debian or Ubuntu, install with:

   sudo apt-get install nasm

3. For other Linux distros, use your package manager (e.g., Urpmi, Yum, Emerge) or get NASM from the official site.

4. Assemble your source file using:

   nasm -f elf file.asm

   This creates file.o (object file) in the current directory.

Step 3: Create Executable

1. With the file.o object file, two cases exist:

   Case 1: Program begins with _start procedure (no main function):

   ld file.o -o file

   Case 2: Program begins with main procedure:

   gcc file.o -o file

   (Note: Repository optimized for Case 1)

   The executable is now created and resides in the current directory.

Step 4: Execute Program

1. To run the program named "test," use:

   ./file

Readme File Additions:

Linux Executable Creation with NASM

This guide outlines the steps to create Linux executables from NASM source code. NASM, serving as an assembler and disassembler for Intel x86 architecture, facilitates the translation of mnemonics into machine language.

Usage Instructions:

1. Source File Creation:

   • Open your preferred text editor.

   • Write your NASM source code.

   • Save the file with a .asm extension.

2. Assemble Source File:

   • Ensure NASM is installed. For Debian/Ubuntu, use sudo apt-get install nasm.

   • Install NASM using your distro's package manager or from the official site.

   • Assemble the source file with nasm -f elf file.asm.

3. Create Executable:

   • For programs starting with _start, create an executable with ld file.o -o file.

   • For programs starting with main, use gcc file.o -o file.

4. Execute Program:

   • Run the executable with ./file.

This process simplifies the creation of Linux executables from NASM source code, providing you with functional programs for your Intel x86 architecture projects.

reference

Assembly Code Snippet

Assembly Repository