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https://github.com/RetroPortingToolKit/psxrecomp
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Matthew Stanley
582aeccdac
USER PIVOT 2026-07-02 (CLAUDE.md §0 amendment included): psxrecomp now carries an opt-in High-Level Emulation backend alongside LLE. LLE (the recompiled BIOS) stays the default, the reference implementation, and the correctness/timing oracle; every service HLE does not implement falls through to LLE, so HLE is never load-bearing beyond what it covers. Mechanism: full_function_emitter.cpp emits a null-by-default hook g_psx_bios_hle_hook consulted at the top of every psx_dispatch_impl iteration, on the pre-normalize physical address, BEFORE any backend (game image / dirty-RAM / static table) claims the target. A handled call resumes at $ra through the trampoline's existing return/tail contract. NULL (default) = pure LLE, dispatch-identical. Regenerating BIOS+game images is required (emitter change). v1 call-HLE (runtime/src/bios_hle.c): the B0 event family — DeliverEvent (incl. callback dispatch with the kernel-true $ra 0x1720), OpenEvent, CloseEvent, TestEvent, EnableEvent, DisableEvent — each ground-truthed instruction-by-instruction against the SCPH1001 kernel disassembly (0xBFC11644..0xBFC11A84) and operating on the REAL guest EvCB table ([0x120]/[0x124], stride 0x1C). WaitEvent/threads/pads/card/A0/C0 fall through to LLE. Cycle charges are documented approximations; LLE remains the timing oracle. No-stubs stands. Boot HLE: with the tier on (and no keep-intro opt-out) the hook one-shot intercepts the first dispatch of the BIOS shell entry (RAM 0x30000 — LoadRunShell's indirect call always routes through the dispatcher), so BIOS Main() proceeds straight to SYSTEM.CNF + game EXE load with kernel state built entirely by the real recompiled kernel init, unpaced (boot turbo) until game handoff. This REPLACES the fast_boot snapshot capture/restore; fast_boot=true now aliases the boot-skip alone. Selection: [runtime] bios_hle / bios_hle_keep_intro (+ settings.toml bios_hle mirror), PSX_BIOS_HLE / PSX_BIOS_HLE_KEEP_INTRO env overrides, startup banner bios_backend=/bios_boot=. The PSX_HLE_SCHEDULER spike is folded in as the tier's standing subsystem replacement: default from [runtime] hle_scheduler via psx_hle_scheduler_set_default, env wins. Observability: always-on 16K-entry HLE ring (route LLE-fallthrough / HLE / boot-skip per record) + hle_dump TCP command (TCP_COMMANDS.md). VALIDATED on Tomba (build-wt): LLE pass byte-identical behavior (real intro, card check, save/load OK); HLE pass boots shell-less, TestEvent/ DeliverEvent route HLE, ChangeTh/ReturnFromException/OpenTh/CloseTh and the card stack fall through to LLE, save/load OK (user-driven). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>