# MediEvil decompilation: an early checksum-gated PlayStation project

> Decompiles the US PlayStation release of MediEvil toward C source that rebuilds its main executable, game executable and 26 overlays. splat splits the user's own disc files, and the default build compares all 28 outputs with SHA-1 checksums. README describes the project as a work in progress and publishes no progress figure.

- Type: Case study
- Targets: Game
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-10-18
- Added to the catalog: 2026-10-18
- Original resource: <https://github.com/MediEvilDecompilation/medievil-decomp>
- Primary source: <https://github.com/MediEvilDecompilation/medievil-decomp/blob/6afe6fe35d5ddf0ce1bebdb2e72f8215b5b5b407/README.md>
- Catalog page: <https://awesomerea.org/resources/medievil-decomp-case/>
- Record JSON: <https://awesomerea.org/resources/medievil-decomp-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/medievil-decomp-case/index.md)

## Requirements & limits

- **Prerequisites:** Requires files from the user's own US MediEvil disc in disk/; the splat configuration expects SCUS_942.27 with a fixed SHA-1, and make extract splits the executables and overlays from those files. The repository supplies no game files.
- **Prerequisites:** The build expects a Linux-style host: GNU make, mipsel-linux-gnu binutils, Python 3 with the listed packages such as spimdisasm and rabbitizer, and the splat, m2c, maspsx and asm-differ submodules. C files go through a bundled PlayStation GCC 2.8.1 cc1 binary and maspsx. README points contributors to wiki pages for setup, the rebase workflow and the decompilation process.
- **Scope:** README describes a work-in-progress decompilation of the US PlayStation MediEvil 1, with MediEvil 2 left for later. The Makefile targets SCUS_942.27, MEDIEVIL.EXE and 26 overlay binaries. In the reviewed tree most functions are still included as split assembly through INCLUDE_ASM rather than written in C, README's progress section is a placeholder, and the pinned commit dates from 2026-02-23.
- **Testing evidence:** make all builds every binary and runs sha1sum against config/medievil.check.sha; CI runs extraction and that check using disc files from an access-restricted repository. A passing check shows that the assembled outputs match those checksums.
- **License:** The repository declares MIT; original game content, the bundled compiler binaries and the PSY-Q headers and data in the tree retain their own terms. The project is separate from the MediEvil Recomp static recompilation.

## Primary sources

1. <https://github.com/MediEvilDecompilation/medievil-decomp/blob/6afe6fe35d5ddf0ce1bebdb2e72f8215b5b5b407/README.md>
2. <https://github.com/MediEvilDecompilation/medievil-decomp/blob/6afe6fe35d5ddf0ce1bebdb2e72f8215b5b5b407/Makefile>
3. <https://github.com/MediEvilDecompilation/medievil-decomp/blob/6afe6fe35d5ddf0ce1bebdb2e72f8215b5b5b407/config/medievil.check.sha>
4. <https://github.com/MediEvilDecompilation/medievil-decomp/blob/6afe6fe35d5ddf0ce1bebdb2e72f8215b5b5b407/config/splat.main.yaml>
5. <https://github.com/MediEvilDecompilation/medievil-decomp/blob/6afe6fe35d5ddf0ce1bebdb2e72f8215b5b5b407/.gitmodules>
6. <https://github.com/MediEvilDecompilation/medievil-decomp/blob/6afe6fe35d5ddf0ce1bebdb2e72f8215b5b5b407/tools/requirements-python.txt>
7. <https://github.com/MediEvilDecompilation/medievil-decomp/blob/6afe6fe35d5ddf0ce1bebdb2e72f8215b5b5b407/.github/workflows/ci.yaml>
8. <https://github.com/MediEvilDecompilation/medievil-decomp/blob/6afe6fe35d5ddf0ce1bebdb2e72f8215b5b5b407/src/game/800.c>
9. <https://github.com/MediEvilDecompilation/medievil-decomp/blob/6afe6fe35d5ddf0ce1bebdb2e72f8215b5b5b407/LICENSE>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.