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This article explains how to learn x86-64 assembly by creating a graphical interface from scratch.
About Gaultier Blog
This article teaches x86-64 assembly by building a simple GUI program that opens an X11 window and draws text. It uses the nasm assembler and connects to the X11 server directly over a socket without libX11 or libxcb, covering steps such as connecting, creating a window, mapping it, and handling server messages.
The examples use Linux system call values, with notes on changing them for other Unix systems. X11 authentication is skipped and covered in a separate article, and the macOS with XQuartz setup is described as untested.
Key features
- Walks through opening a socket and connecting to X11 server
- Explains stack use with a small assembly example
- Shows creating a window, mapping it, and polling messages
- Shows opening a font and drawing text
- Includes full assembly code in an addendum
- Uses Linux syscalls with notes on porting to other Unix systems
Best for: Beginners learning x86-64 assembly who want a practical GUI example from scratch.
Good for
- Written to be approachable for beginners learning assembly and X11
- Builds the GUI without external libraries using direct socket commands
- Includes the full code and links to external discussions
Watch out for
- Skips X11 authentication, which some servers such as XWayland require
- Uses Linux system call values, so other systems need changed values
- macOS with XQuartz setup is untested by the author
Gaultier Blog at a glance
- Category
- Education & Learning › Learn to Code
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Gaultier Blog FAQ
What do I need to follow the article?
The nasm assembler and X11 on Linux, without additional libraries for the GUI part.
Does the example handle X11 authentication?
No. Authentication is skipped here and is handled in a separate article.
Will the code work on Wayland or macOS?
The author confirms it works with XWayland. Use on macOS with XQuartz is untested and needs nasm macho64 format and different linker handling.
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