A work-in-progress matching decompilation of Kingdom Hearts 358/2 Days (Nintendo DS). The goal is C source that recompiles to a binary byte-for-byte identical to the original game code.
This repository does NOT contain the game ROM, any game assets, or any of the original binary/assembly. An existing, legally-obtained copy of the game is required to extract and build it.
This repository is a matching decompilation only. It does not contain or produce a playable build or any redistributable game binary, and building it requires an original, legally-obtained copy of the game. All trademarks and the original game are property of their respective owners.
This project is in an early bootstrapping phase. Progress is intentionally split into separate categories so inline ASM placeholders and SDK byte-match identifications are not counted as real C decompilation.
| Category | Count | Meaning |
|---|---|---|
| Real C-decompiled matched functions | 23,060 / ~23,233 (~99.3% by function count) | Functions implemented in C and verified byte-exact |
| Complete functions (C + verified original library assembly) | 23,166 / ~23,233 (~99.7%) | Real C, plus library functions whose original source is assembly (NitroSDK/MSL asm, BIOS veneers): C cannot express them, so they count once integrated as that assembly and byte-verified with source evidence in config/arm9/report_asm_matches.json. |
| Real C-decompiled matched bytes | 4,653,930 / 4,728,788 (~98.42% by code bytes) | Real-C-only byte progress; asm_stubs/, inline ASM and nonmatching/ are excluded. decomp.dev additionally counts source-hashed, verified SDK assembly and authorized CLZ exceptions as matching, not as C. See progress policy. |
| Inline ASM / ASM stub matched functions | 129 / ~23,233 (~0.6%) | ASM implementations, including temporary game stubs, canonical library assembly and authorized inline exceptions; never counted as real C. Only explicitly verified manifest entries contribute to decomp.dev matching coverage. |
| SDK/library byte-match identifications | 3 / ~23,233 (~0.0%) | NitroSDK or library functions identified separately by byte matching |
| Named but not decompiled | 41 / ~23,233 (~0.2%) | Functions known to the project but not implemented as C |
| Initialized DATA | 188,340 / 188,340 (100.00%) | Byte/relocation-verified .rodata/.data; includes the separately reported MobiClip executable payload at 26,012/26,012 bytes. |
| Total known functions | 23,240 | Function index for the EU YKGP target |
| Region | EU (YKGP) |
|
| Compiler | CodeWarrior mwccarm 3.0 build 139 |
Fully-decompiled modules now include ov031, ov188 and ov189; see PROGRESS.md for the complete generated list. A few precompiled-middleware translation units (e.g. the ov028 anti-tamper crypto core) build with an older mwccarm via a per-file compiler override (config/arm9/file_compilers.json). |
The current counts are generated by python tools/audit_progress.py. See
docs/PROGRESS_POLICY.md for what counts as real
decompiled progress.
Only real C implementations are counted as C-decompiled progress.
Inline ASM, ASM stubs, INLINE_ASM, NON_MATCHING, or similar placeholder code
may be used temporarily for bootstrapping and verification, but these are not
counted as decompiled C progress.
SDK/library byte-match identifications are tracked separately from game-code decompilation. See sdk/README.md for the SDK identification workflow.
src/auto/ real C leaf functions (byte-exact, no external calls)
src/calls/ real C functions with calls (byte-exact)
src/asm_stubs/auto/ ASM / inline-asm bootstrap stubs, leaf functions
src/asm_stubs/calls/ ASM / inline-asm bootstrap stubs with calls
config/ dsd project config (symbols / delinks / relocs per module)
macros/ assembler macros (function.inc)
tools/ Python tooling (extraction, matching, candidate finders)
sdk/ NitroSDK byte-match identification harness (see sdk/README.md)
build/ generated manifests and reports; build output is git-ignored
Files under src/asm_stubs/ may match the original bytes, but they are
temporary ASM-based matches (asm void, __asm, hand-written ARM) that were
used to bootstrap the project. They are counted separately from real C
decompilation progress, see docs/PROGRESS_POLICY.md.
The ROM, the extracted data (dsd_extract/, asm/), build artifacts, and the
proprietary toolchain are intentionally not tracked; see .gitignore.
Some temporary ASM stubs or handwritten inline assembly may exist while the
project is being bootstrapped. These are not original extracted assembly files
and are not counted as real C-decompiled progress.
You need your own copy of the game plus the toolchain (see CONTRIBUTING.md for setup). Then, to verify a single function:
python tools/getcand.py func_XXXXXXXX # prints disasm + the verify command
python tools/match.py <your.c> <...> # compiles and byte-comparesA green >>> MATCH <<< means your C reproduces the original exactly.
dsd- DS ROM extraction / delinkingmwccarm3.0 (CodeWarrior for Nintendo DS) - the matching compilerarm-none-eabi-as(GNU binutils) - assembling the not-yet-decompiled.s- Python 3 with
capstone,pyelftools,ndspy
See the Nintendo DS decompilation guide.
Contributions are very welcome; see CONTRIBUTING.md. Every matching function must pass byte-exact verification, and public C decompilation progress only counts real C implementations. Progress per module and how to claim one is in PROGRESS.md.
The decompilation and tooling in this repository are dedicated to the public domain under CC0 1.0. This applies only to the contributors' own work; the original game and its assets remain the property of their owners.