Drew T
15f936e2ea
func_80144B9C (770 ins) was matched in 134/138 overlays and open in the four SC07s — 3,080
instructions of code BYTE-IDENTICAL (h_exact, reloc payloads included) to what was already banked,
blocked by a missing file boundary. Now banked in ov_SC07_006 / _007 / _011 for ~0 agent tokens.
R22 clean-fleet 140/140.
THE PLAN'S FRAMING WAS WRONG. This was recorded as "the SC07 carve defect (T2 Arm-A %lo +0x20)".
The carve was never broken: o0_subsplit reported `split byte-neutral` on the FIRST attempt in all
four. The real blocker is that carving the whale out of a jr file makes jr_isolate_all hoist the
parent's file-scope decls into the new region as its `ambient` set — so for the first time the
fleet's loose-typed spellings share a TU with the shared header's (`extern void *D_801274CC` vs
`extern s32 D_801274CC`). In the 134 working overlays the whale sits in a CLEAN -O0 file (common.h +
the header, nothing else) and the two never meet. Fix: drop, in that one file only, the ambient
decls the header already declares — the header being the byte-proven side.
Three iterations, each exposing the next layer of the ambient set, every one a DECLARATION:
1. data symbols (D_80126B58, D_801274CC, D_801274D0)
2. function symbols (func_801336E8, func_8005C324)
3. the alias form terminated by a trailing COMMENT, which an endswith(';') test skipped —
the §134 comment-blindness shape for the THIRD time today.
ov_SC07_010 REVERTED and left open (hence 137/138). Its split landed in an EXISTING _o0c file
rather than a fresh _o0d, producing region _jr_801457A4 whose asm dir splat never generated. It
passed its per-binary build and FAILED the clean-tree R22 — the first R22 failure of the session,
and precisely why a per-binary pass is not a fleet byte claim (§61). Committing on that per-binary
"BANKED" would have shipped a broken overlay.
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.