Claude
99a4002ffb
Adds a CD-command trace to psx-beetle (beetle_cdcmd_trace_hook.patch: callback in cdc.cpp's command dispatch, wired through beetle_libretro.cpp into cdrom_cmd_dump / cdrom_cmd_reset on the oracle debug server). This is the two-process oracle-diff the setup is built for, now working on Linux. Live-diff result (docs/kula-world-findings.md, bug 3): the oracle's game reads level data with a clean Setloc->SeekL->Setmode->ReadN->Pause per sector (SeekL x18, ReadN x22, GetlocL x89). Our runtime's game, in the wedge, issues NEITHER SeekL NOR ReadN — only GetStat/Init/Setloc/Pause, an error/retry branch the oracle never enters. Crucial: our runtime DID deliver 307 sectors during early boot (ReadN + data delivery work). Reads only stop at frame ~890 — the BIOS mid-game region revalidation (ReadTOC+GetID). The region fix made that PASS, but the post-ReadTOC CD state still stops the game resuming reads. Prime suspect: our ReadTOC (case 0x1E) is a bare stat+COMPLETE stub that does not model drive repositioning / the track table the game reads to recompute its seek. Documented for the next session. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01BdjxoRB1f9VQsNzZayCgGS
1.9 KiB
Building psx-beetle on Linux
The psx-beetle oracle builds and runs on Linux with the same wire protocol as on Windows. Verified 2026-07-02 (Kula World boots to demo gameplay; ping/screenshot served over the TCP debug protocol).
beetle-psx checkout
runtime/src/beetle_libretro.cpp targets the C++ beetle-psx tree. Upstream
master has since been converted to plain C (libretro.cpp -> libretro.c,
PS_CPU class dropped), which no longer compiles against our integration.
Pin the checkout to the last compatible commit — the same base
docs/beetle_wtrace_hook.patch was generated from:
git clone https://github.com/libretro/beetle-psx-libretro.git beetle-psx
cd beetle-psx
git checkout 5759277b # "audit pass" — last C++-tree base we target
patch -p1 < ../docs/beetle_wtrace_hook.patch
patch -p1 < ../docs/beetle_sio_trace_hook.patch
patch -p1 < ../docs/beetle_cdcmd_trace_hook.patch
beetle_cdcmd_trace_hook.patch adds a CD-command trace callback (fires per
command dispatch in cdc.cpp) exposed as the cdrom_cmd_dump / cdrom_cmd_reset
debug commands — used to oracle-diff the Kula World CD read sequence.
beetle_sio_trace_hook.patch adds FrontIO::SetSIOTraceCallback (fires per
completed SIO byte exchange) — an integration hook beetle_libretro.cpp needs
that predated the committed wtrace patch.
Build
# Static lib. On unix the artifact is named mednafen_psx_libretro.so but is
# an ar archive (STATIC_LINKING=1); stage it under the name cmake expects.
make platform=unix STATIC_LINKING=1 HAVE_LIGHTREC=0 -j"$(nproc)"
cp mednafen_psx_libretro.so libmednafen_psx.a
cd ../runtime
cmake -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DPSX_LAUNCHER=OFF -DPSX_DEBUG_TOOLS=ON
ninja -C build psx-beetle
# Headless run (picks the next free port from 4380 if taken; watch stderr)
xvfb-run -a ./runtime/build/psx-beetle ../bios/SCPH1001.BIN --disc <game.cue>