Drew T
8ca9d53cad
- drafts .run/P32/t3/haiku/<fn>.c, each rtu_match MATCH in the real TU twice (S82 + this session, after the
byte-neutral func_800CF3B0 decl commit commit:3939); one build for the same-TU batch; make build -j8 rc 0;
sha1 2ff702b605ab5cfc18474c464c4c07e5f8ffd48c == config/check.md_MAIN_007.sha; stubs 14 -> 8
- two integration classes the per-draft rtu_match is BLIND to (it splices one draft at a time):
(1) same-TU drafts spelling one global differently — func_800CEEFC `extern s16 D_800B99E8` (file scope) vs
func_800CEF94 block-scope `extern u16 D_800B99E8` -> `conflicting types` only once both are spliced; the
file-scope decl became u16 (func_800CEEFC only stores zero, so the sign is inert there; the u16 load in
func_800CEF94 is the byte-bearing one)
(2) §304 self-defining rodata — func_800CF068's stub .s was the ONLY owner of `dlabel D_800CEDFC`
(".asciz C:\TIMPACK\OPDEMO0.PAT"); banking the body deleted the definition -> `undefined reference to
D_800CEDFC` at LINK (compile-only rtu_match cannot see it). Fix: `const char D_800CEDFC[] = "..."` at file
scope at the extern's position (directly after INCLUDE_RODATA D_800CEDF8, so the island order 0x0/0x4 holds
under the §303 derive stage) + a (void *) cast at the func_8001AA98 call
- closers (cookbook §500-B): func_800CF148's block-scope redecl of func_800CF3B0 now agrees with the TU's no-proto
decl; func_800CF2BC post-increment passes the old counter; func_800CEEFC/func_800CEF94 goto shape +
`(result << 16) == 0`; func_800CF068 hand-drafted from the md_MAIN_008:0x800cee44 twin's shape (remap refused,
reloc 6≠7); func_800CF3B0 leaf-exact 22/22 admitted by the decl fix
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.