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

Copyright © 2021 by Eliane Schmidli and Yves Boillat

Modified 2022 by Michael Schneider and Tobias Petter