Drew T
2c4e2344da
R35: fix the instrument before planting a flag on its denominator.
- #if 0 BLINDNESS: classify() knew `#ifdef NON_MATCHING` (:425) but not `#if 0`, so a dead
analysis body was read as a live definition AND its real INCLUDE_ASM stub counted separately —
the SAME function in BOTH `real` and `stubs`. Live case: resident.c:868-925 wraps a full
void func_800D00E4(s32){...} in #if 0 (its jtbl dossier) and re-declares the stub at :926.
Now the block is skipped entirely: dead code is neither matched nor stubbed.
- THE len()-SUM (the dual defect): `placed` was a set union, so it caught a function in NO bucket
— but `matchable` SUMMED len()s, so a function in TWO buckets counted twice and nothing
complained. matchable/byteident are now SET unions, plus a new OVER-coverage assertion that
fails loudly if any fn lands in multiple buckets. R32 means both directions: nothing missing,
nothing double-counted.
- NEGATIVE CONTROL (the fix must change an answer the old tool gave):
resident REAL 123 -> 122 | matchable 146 -> 145 | 85.62% -> 85.52% | func_800D00E4 no longer
double-counted. FLEET instr 68.9% UNCHANGED (no #if 0 in the overlays) — the fix is scoped.
- FINDING (logged for T7's audit-binaries, does NOT block the flag-plant): the two INDEPENDENT
oracles now agree exactly at 144 — corpus (21 stubs + 123 matched, derived from the tree) and
sig_image (the 2nd oracle) — with EMPTY set difference both ways. progress.py still reports 145
because it counts func_800CEDFC and func_800D33E0, which are DEFINED in resident.c but absent
from sig_image. 0x800CEDFC is the resident's vram base +4 (the first function, code starts at
file offset 0x4 after the leading data word), yet make audit-corpus reports 0 PHANTOM +
0 TRUNCATED. Either sig_image has a boundary blind spot or those defs are not image functions.
progress.py's text-scanning classify() is exactly the re-parsing R33 says should be DERIVED from
corpus instead — a real refactor, logged not rushed.
The flag-plant claim is unaffected: it rests on corpus.stubs('resident') == 21 (tree-derived,
verified 5 ways), not on the contested denominator.
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.