Odyssey Decompilation Project

Decompilation of Super Mario Odyssey 1.0.0.

Sorted function map can be found here.

Building

Reminder: this will not produce a playable game. This project will not allow you to play the game if you don't already own it on a Switch.

For Windows users

While Linux is not a hard requirement, it is strongly advised to set up WSL to simplify the setup process. Ubuntu 20.04 is usually a good choice.

The instructions below assume that you are using Linux (native or WSL) or macOS.

1. Set up dependencies

• Python 3.6 or newer with pip
• Ninja
• CMake 3.13+
  • If you are on Ubuntu 18.04, you must first update CMake by using the official CMake APT repository.
• ccache (to speed up builds)
• xdelta3
• clang (not for compiling SMO code, but for compiling Rust tools)

Ubuntu users can install those dependencies by running:

sudo apt install python3 ninja-build cmake ccache xdelta3 clang libssl-dev

Additionally, you'll also need:

• A Rust toolchain (follow the instructions here)
• The following Python modules: capstone colorama cxxfilt pyelftools ansiwrap watchdog python-Levenshtein toml (install them with pip install ...)

2. Set up the project

1. Clone this repository. If you are using WSL, please clone the repo inside WSL, not on the Windows side (for performance reasons).

2. Run git submodule update --init --recursive

   Next, you'll need to acquire the original 1.0 main NSO executable.

   • To dump it from a Switch, follow the instructions on the wiki.
   • You do not need to dump the entire game (RomFS + ExeFS + DLC). Just dumping the 1.0 ExeFS is sufficient.

3. Run tools/setup.py [path to the NSO]

   • This will:
     • install tools/check to check for differences in decompiled code
     • convert the executable if necessary
     • set up Clang 3.9.1 and 4.0.1 by downloading them from the official LLVM website
     • create a build directory in build/
   • If something goes wrong, follow the instructions given to you by the script.
   • If you wish to use a CMake generator that isn't Ninja, use --cmake_backend to specify it.

3. Build

To start the build, just run

python tools/build.py

By default, a multithreaded build is performed. No need to specify -j manually.

Use --clean to perform a clean build, and --verbose to enable verbose output.

To check whether everything built correctly, just run tools/check after the build completes.