Assembly Books

Comprehend X86 Assembly Language with Open Source Books

An assembly language is a low-level programming language for a computer, or other programmable device. Assembly language is used by almost all modern desktop and laptop computers. It is as close to writing machine code without writing in pure hexadecimal. It is converted into executable machine code by a utility program referred to as an assembler.

Assembly language is infrequently used by programmers nowadays, but there are still good reasons to learn the language. It is the most powerful computer programming language available. While assembly language shares very little with high level languages (such as Java, C#, Python etc), and assembly languages for different CPU architectures often have little in common, it gives programmers the insight required to write effective code in high-level languages. Assembly language is also used primarily for direct hardware manipulation, access to specialized processor instructions, or to address critical performance issues. Assembly is excellent for speed optimization.

We have published a series covering the best open source programming books for other popular languages. Read them here.

Programming From The Ground Up

Programming from the Ground Up

By Jonathan Bartlett (326 pages)

Programming from the Ground Up is an introductory book to programming and computer science using assembly language. It teaches assembly language for x86 processors and Linux. It assumes the reader has never programmed before, and introduces the concepts of variables, functions, and flow control.

The reason for using assembly language is to get the reader thinking in terms of how the computer actually works underneath. Knowing how the computer works from a “bare-metal” standpoint is often the difference between top-level programmers and programmers who can never quite master their art.

This book should teach the reader to understand how a program works and interacts with other programs, be able to read programmers’ code and learn how they work, to learn new programming languages quickly, and also to learn advanced concept in computer science quickly. The book includes review exercises at the end of each chapter.

Chapters cover:

  • Introduction
  • Computer Architecture – structure of computer memory, the CPU, interpreting memory, and data accessing methods
  • Your First Programs – teaches the reader the process for writing and building Linux assembly-language programs, the structure of assembly-language programs, and a few assembly-language commands
  • All About Functions – looks at how functions work, assembly-language functions using the C calling convention, and recursive functions
  • Dealing with Files – the UNIX file concept, buffers and .bss, standard and special files, and using files in a program
  • Reading and Writing Simple Records – deals with reading and writing simple fixed-length records
  • Developing Robust Programs – deals with developing programs that handle error conditions gracefully. This is known as robust programs
  • Sharing Functions with Code Libraries – using a shared library, how shared libraries work, finding information about libraries, useful functions, and building a shared library
  • Intermediate Memory Topics – how a computer views memory, the memory layout of a Linux program, getting more memory, a simple memory manager, and more
  • Counting Like a Computer
  • High Level Languages – looks at a “real-world” programming language
  • Optimization – focuses on speed optimization
  • Moving on from Here
  • Appendices

Permission is granted to copy, distribute and/or modify the book under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation.

Reverse Engineering for Beginners

Reverse Engineering for Beginners

By Dennis Yurichev (1061 pages)

Reverse Engineering for Beginners offers a primer on reverse-engineering, delving into disassembly code-level reverse engineering and explaining how to decipher assembly language for those beginners who would like to learn to understand x86 (which accounts for almost all executable software in the world) and ARM code created by C/C++ compilers. It discusses x86/x64, ARM/ARM64, MIPS, and Java/JVM.

Chapters cover:

  • Code patterns – Hello, world!, Stack, printf(), scanf(), accessing passed arguments, pointers, GOTO, conditional jumps, switch()/case/default, loops, floating-point unit, arrays, manipulating specific bit(s), structures, unions, pointers to functions, 64-bit values in 32-bit environment, and more
  • Important fundamentals – endianness, memory, and CPU
  • Slightly more advance examples – temperature converting, Fibonacci numbers, iterators, Duff’s device, inline functions, variadic functions, strings trimming, obfuscation, C++, and more
  • Finding important/interesting stuff in the code – strings, constants, suspicious code patterns, and more
  • OS-specific – arguments passing methods, thread local storage – system calls, Linux, and more
  • Tools
  • Examples of reversing proprietary file formats

The book is available in Russian and English, and there are partial translations in Chinese, German, French, Italian, and Brazilian Portuguese.

This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license.

PC Assembly Language

PC Assembly Language

By Paul Carter (190 pages)

This book is a good tutorial on 32-bit protected mode assembly programming on the x86 processor.

The tutorial has extensive coverage of interfacing assembly and C code and so will interest C programmers who want to learn about how C works under the hood. All the examples use the free NASM (Netwide) assembler.

Chapters cover:

  • Introduction – number systems, computer organization, assembly language, and creating a program
  • Basic Assembly Language – explains how to work with integers, control structures, translating standard control structures. The chapter also looks at a program that finds prime numbers
  • Bit Operations – shift operations, Boolean bitwise operations, avoiding conditional branches, manipulating bits in C, big and little endian representations, and counting bits
  • Subprograms – looks at using subprograms to make modular programs and to interface with high level languages
  • Arrays – defining arrays, and array/string instructions
  • Floating Point – floating point representation, floating point arithmetic, the numeric coprocessor
  • Structures and C++

The book may be reproduced and distributed in its entirety, provided that no charge is made for the document itself, without the author’s consent.


Other good assembly books which are available to read for no charge but which are not released under an open source license are listed below:


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Assembly, C, C++, C#, Clojure, CoffeeScript, ECMAScript, Go, Java, JavaScript, Perl, PHP, Python, R, Ruby, Scratch, Swift

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