Introduction To X86 Disassembly May 2026

The "Instruction Pointer," the finger that points to the exact line of code currently being executed. 2. The First Discovery: MOV and ADD

Suddenly, you hit a line that says CMP EAX, 20 followed by JNE 0x401050 . The machine is checking if your total is 20.

Are you interested in or exploit development ? Introduction to x86 disassembly

To understand how it works, you have to look at the "gears" while they move. In the world of computers, those gears are and Instructions . 1. The Workbench (The CPU & Registers)

When it’s done, it that memory back off the stack to return home. The Conclusion The "Instruction Pointer," the finger that points to

You look through a digital microscope (a like IDA Pro or Ghidra). You see a sequence of hex numbers: B8 05 00 00 00 . The disassembler translates this into: MOV EAX, 5

Before you look at the code, you look at your tools. Your workbench has a few small slots to hold data while you work. In x86, these are your : EAX: Your primary calculator. The machine is checking if your total is 20

Should I explain the difference between and x64 (64-bit) ?