Drew T
62042f65ca
Fleet 96.06 -> 96.10% fn-count / 93.7% instr / 88.0% distinct; dedup 1907 -> 1908 groups, 0 failed, C1 240807/240807. R22 clean-fleet: 140 passed, 0 failed of 140. func_8012A598 (3,288 templatable ins) was being written off as CARRY-FIXABLE. It took TWO fixes; either alone leaves it skipped. 1. TOOL (R33) — find_site's preamble backscan. The SESSION-18 fix handled blank, `//`, and SINGLE-LINE `/* … */` lines, but a MULTI-LINE block comment still halted the walk: its middle lines start with `*` and its last line ends `*/` without starting `/*`. So the three externs above the body were dropped and the body then failed compiles_standalone on now-undeclared data. This is the §134 multi-line-blindness class — S6b fixed the identical shape three times in family_remap (D1/D2/D5) and this copy was never reached. Fixed by deciding skippability on `cdecl._mask` — the project's ONE masking oracle — instead of on line syntax: it subsumes every comment form at once and cannot be fooled by a `/*` inside a string, with an R32 assertion on the length-preservation invariant it rests on. Strictly monotone (it can only carry MORE preamble), and dedup_propagate is a byte-gate feeder, so a bug here can fail to bank but never falsely bank. 2. EXEMPLAR — the body also declared a draft-local `struct BigCopy164` tag, which the tool refuses by design (two macros defining one tag would redefine it in a single TU). The shared `struct BigCopy` (engine_types.h L312) is the identical layout and is ALREADY used this exact way at engine_core.h:16158, so switching the exemplar to it is byte-neutral and drops the alias too. Probed on ONE member before scaling (R37/S29): byte-identical 9052dc0e first try; then 138 overlays byte-identical. PROPAGATE head accounting after this: 7,398 of 18,545 ins banked (func_80147364 4,110 + func_8012A598 3,288). Still open, each with a NAMED cause and none yet diagnosed against a build: func_8012f274 (3,973, dropped), func_8016ba68 (3,886, 4/138), func_801466f0 (3,288, the S6b D4 wrapped-alias gap).
BFM-decomp
A matching decompilation of Brave Fencer Musashi (PlayStation, SLUS-00726, USA 1998) — the first public decompilation effort for this game.
What "matching" means
The goal is C source code that, compiled with the original-era toolchain (PsyQ 4.x / GCC 2.7.2-family + ASPSX via maspsx), produces a byte-for-byte identical SLUS_007.26 and, eventually, byte-identical overlay binaries. SHA1 checksums are the ground truth; "functionally equivalent" does not count.
No ROM content
This repository contains no game assets, no disassembly output, and no ROM-derived data — only source code, build configuration, symbol names/addresses, hashes, and documentation. To build or contribute you must provide your own dump of the game disc (4-track BIN/CUE, redump layout). See .gitignore for the firewall.
Project status
Latest (Phase 19, 2026-06-20): the project builds 136 binaries byte-identical from a clean tree (the EXE + the resident engine + all 134 location overlays);
make check-all→ 136/136. Fleet byte-identical-from-source is 58.0% (function-instance-weighted; see the PhaseEnds for the byte-weighted ~30% figure and what it includes). Shared engine functions are matched once inov_SC01_077and propagated ×134 viatools/dedup_propagate.py. (The narrative below is Phase-11/12-era; a full refresh is part of the public-flip prep.)
Gen1 (foundation) complete — the matching pipeline is proven end-to-end. make extract && make build && make check rebuilds SLUS_007.26 byte-for-byte identical (SHA1 143dbb89…) from C + assembly, reproducibly across many sessions.
- Compiler pinned by evidence:
gcc-2.7.2-psx -O2 -G0 -mips1 -mcpu=3000+maspsx --aspsx-version=2.56 --expand-div. - 52 functions hand-matched to byte-identical machine code — including the LZSS streaming decompressor — with a decomp-permuter + matching-cookbook "flywheel" to accelerate the next.
- 959 PsyQ SDK functions linked byte-identical (libcd, libgs, libgte, libspu/libsnd, libgpu, libc2, libmcrd, libapi/libcard, libetc) straight from the real PsyQ 4.0 libraries instead of re-decompiling them — bringing byte-identical-from-source coverage of the EXE to ~50%.
- File-loader / overlay system reverse-engineered, with the resident engine blob + location overlays' load addresses proven byte-identical against a live PCSX-Redux RAM dump.
About half the EXE is still INCLUDE_ASM stubs (correct bytes, not yet C), and the bulk of the game lives in compressed overlays inside the .CD archives — Gen2 (overlays & engine at scale) is underway:
- The build toolchain is binary-agnostic (one parameterized pipeline builds any binary), and the always-resident engine blob rebuilds byte-for-byte from source (SHA1
8e17e02f…) — the second binary reconstructed exactly, after the EXE — and is now 86% hand-matched C (123 / 146 functions, up from 0): its scripting turned out to be compiled-MIPS state/mode dispatch, not a bytecode VM, and the save-file + sound (SQV) formats are documented. The harvest used a reusable swarm-of-agents + bit-for-bit byte-gate method (a wrong match can't be accepted) —tools/harvest_verify.py+tools/match_one.py, which carry straight into the overlay phase. - A cross-binary deduplication pipeline is live: a Ghidra-free signer fingerprints all 134 location overlays, and the report finds ~9,000 byte-identical function groups shared across binaries (~28 MB of collapsible code) — a single engine function is byte-identical in all 134 overlays. This is "one match unlocks many": each engine match will be auto-credited across the overlay fleet.
Current phase and detailed progress live in phase-ends/ (newest PhaseEnd_*.md = current state); methodology, rules, and the full roadmap are in PROJECT_CONTEXT.md; environment setup in docs/SETUP.md.
This project is developed primarily by Claude Code driving Ghidra through an MCP server; see CLAUDE.md.
License
Private repository for now. AGPL-3.0 is planned at public release, modeled on sotn-decomp. tools/brave-CUE/ is CUE's BRAVE extractor (GPL, source included) and retains its own license.