Drew T
85afa0dc81
- R14 finding: the 3 Phase-18 "implicit-int / propagate-first" near-misses are NOT
implicit-int (reproduced each through the byte-gate). Real classes:
(a) resident-callee LINK-miss: draft calls func_<ADDR> but the addr has a curated
name (0x8004CFEC = ratan2) -> "undefined reference to func_8004CFEC". NEW
tools/canon_resident_calls.py rewrites func_<ADDR> -> curated name (pure draft
text, body bytes unchanged) -> run FIRST in the recovery pipeline.
(b) shared-caller ARITY conflict: an engine_core.h caller macro declares the callee
file-scope `extern void func_X(void)` then calls func_X(); the real def takes an
arg -> "conflicting types". FIX = caller extern -> no-proto `extern void func_X();`
(byte-neutral for the caller; compatible with promotion-safe params int/long/ptr).
- 3 matches banked in ov_SC01_077: func_8017209C (ratan2 rewrite), func_80147514 (s32),
func_80168F40 (void*); 2 no-proto lines in src/shared/engine_core.h
- recovery pipeline: draft -> canon_resident_calls -> sig_unify -> harvest_verify --chunk 1
- make check-all 136/136 BYTE-IDENTICAL (full extract, R22); dedup 1450 validated/0 failed;
0 NON_MATCHING in any default build (G4); fleet 56.64% (the 3 are ov_SC01_077-local,
x134 propagation rides T3/Phase-20)
- cookbook §17a-3 corrected (R14/R16); SETUP tool inventory (R21); CURRENT_PHASE T2 done
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
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.