CPUSim - A Graphical CPU Simulator

CPUSim is an open-source web-based animated x64 CPU simulator for educational purposes. Provided as a folder for easy distribution and without installation on the Google Chrome Browser. Powered by Unicorn.js, Capstone.js, Quasar and NASM.

Try it!

You can try the simulator here.

Features

Full NASM x64 assembly syntax support provided by built in NASM assembler
Visual abstraction of CPU cycle, CPU, registers, flags, memory, bytes, addresses, stack, instruction pointer, stack pointer, base pointer
Animated step by step execution of the CPU cycle and possibility to skip them each:
- Get instruction
- Increment instruction pointer
- Execute instruction
Detailed generic animations for basic x64 instructions
Animated state changes
Advanced Debugging functionaliy
- Conditional breakpoints & watchpoints
- Active line displayed in code viewer
- Reverse debugging: Step back and forth to replay each CPU cycle
Visual representation of instructions, stack and base pointer in the memory
Visual indication of bytes belonging to the current instruction and future instructions or stack
Visual indication of which memory bytes were accessed by the simulator
Change log to keep track of past instructions and changes in register and memory values
Code editor with syntax highlighting and assembler feedback
Selection of demo programs
Modern, responsive design
Packed into a self-sustained web application
- Multiplatform
- No installation required
- Deliverable over email, file sharing or simple HTTP server
- Works offline

Build instructions

Clone this repository and follow the instructions in x86/README.md

License

Licenced under SPDX-License-Identifier: GPL-2.0-only

Copyright

Dependencies Copyright Notice