Drew T
838d7cea34
md_MAIN_037 func_800CAF4C md_MAIN_028 func_800CAE0C md_MAIN_015 func_800CAEC0 md_MAIN_029 func_800CAEE0 md_MAIN_013 func_800CAF68 func_800CB6E4 md_MAIN_020 func_800CAF18 func_800CB034 md_MAIN_001 func_800CEF04 md_MAIN_033 func_800CAE0C md_MAIN_023 func_800CAEC0 md_MAIN_003 func_800D06BC md_MAIN_043 func_800CD1F4 md_MAIN_041 func_800CAEC0 func_800CAF08 md_MAIN_038 func_800CAE0C func_800CAED0 md_MAIN_047 func_800CCB28 md_MAIN_046 func_800CCB28 md_SC03_073 func_801EFBC0 md_MAIN_040 func_800CAED0 md_SC03_075 func_801EFBC0 md_SC03_132 func_801E2D50 md_SC04_025 func_801E855C md_SC04_029 func_801E8440 md_SC03_137 func_801E2ED8 md_SC04_026 func_801E82C0 md_SC05_023 func_801EDEAC func_801EE148 md_SC05_024 func_801EDEAC func_801EE3E4 md_SC03_133 func_801E2FF4 md_SC05_025 func_801EDEAC func_801EE148 md_SC05_028 func_801EE2C8 ov_MAIN_012 func_8016829C ov_SC01_001 func_80180890 ov_SC01_074 func_8017D918 ov_SC01_077 func_80184A68 ov_SC01_084 func_8017E224 func_8017E890 func_8017E94C ov_SC01_009 func_8017FE10 ov_SC02_026 func_8017D948 ov_SC02_004 func_8017D8B0 ov_SC02_031 func_8017F400 func_801829F8 ov_SC02_035 func_8017D598 ov_SC02_021 func_8017DC10 func_8017F264 ov_SC02_017 func_8017FCB8 func_8018287C func_80183940 ov_SC02_027 func_8017F498 ov_SC02_011 func_80182380 ov_SC02_005 func_8017E014 func_8017FDB4 func_801800CC func_80180328 func_801803BC func_80180454 func_80180B90 func_8018112C func_8018118C func_80181388 func_8018141C func_80182098 func_801849E4 func_80185858 func_8018655C func_801880AC func_801886C4 func_8018B5E0 func_8018D574 ov_SC03_001 func_8017EFD4 func_8017F258 func_80180E68 func_8018166C func_8018247C func_80184A1C func_80186A04 ov_SC03_012 func_8017DCB4 ov_SC03_011 func_8017E170 ov_SC03_014 func_8017BFA0 ov_SC03_002 func_801813E4 ov_SC03_024 func_8017BFA0 func_8017DA98 func_80180230 func_80180660 func_801806D4 func_80180748 func_801807AC func_801809F8 func_801817A8 func_80184814 func_80184884 func_80184940 ov_SC03_007 func_8017E6C0 ov_SC03_028 func_80185344 ov_SC03_010 func_8017E69C ov_SC03_030 func_8017EEE0 ov_SC03_091 func_801822CC ov_SC03_089 func_80181474 ov_SC03_093 func_8017F8D8 ov_SC03_096 func_8017F444 ov_SC03_097 func_8017EE04 func_8017EF54 func_8017FDBC ov_SC03_029 func_80182E84 func_80183E70 ov_SC03_090 func_801814B4 ov_SC03_092 func_8017F29C ov_SC03_105 func_8017FEA8 ov_SC03_111 func_8018093C func_80181178 ov_SC03_116 func_801819F4 ov_SC03_112 func_8017E9A0 func_80181D08 ov_SC03_110 func_8017F234 ov_SC03_114 func_8017CFC0 func_8017DDA0 ov_SC03_117 func_8017E99C ov_SC03_121 func_8017CE3C ov_SC03_118 func_8017DA98 ov_SC03_124 func_8017FB04 func_80180D48 func_80182488 ov_SC03_125
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.