The post-exception IRQ cooldown counted psx_check_interrupts CALLS. A call is a
backend-dependent unit: compiled checks at block edges (plus extra sites like a
`jr ra` return transition), the dirty-RAM interp checks per-instruction. So the
per-call countdown reached zero at a DIFFERENT guest cycle in each backend, the
next IRQ was delivered at a different cycle/EPC, and the two backends forked
(cosim first-divergence cp 3259 @ cyc ~213.5M). Convert the cooldown to a
guest-cycle DEADLINE (post_exception_cooldown_until): guest cycles advance
identically in both backends (shared, ruler-validated cost model), so the
delivery decision is now backend-independent. Magnitudes preserve prior
breathing room (claimed ~= old 8 blocks, unclaimed ~= old 500 blocks).
Also:
- gpu: GP1(00h) reset no longer clears VRAM. VRAM survives a GPU reset on real
hardware; only power-on gpu_init() clears our backing store (gpu_reset_state).
- codegen hash: include the emitter/translator/discovery .cpp TUs, not just
their .h. A change confined to full_function_emitter.cpp altered generated
dispatch+overlay code while leaving the hash unchanged -> stale overlay-cache
hazard (same class as the ws-emission-not-in-hash gap).
- debug: ring-buffer WINDOW-QUERY primitives -- frame_lo/frame_hi filters on
wtrace/mmio dumps + a capture-freeze frame so a causal window's tail is not
evicted by a post-window event storm before a probe reads it (query the
always-on ring for the window of interest, not arm-and-hope).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Root cause of the Tomba pause-menu wedge (loaded saves only): autocompiled
overlay shards were emitted by a recompiler binary OLDER than the last emitter
change, yet stamped with the CURRENT cg tag (compile_overlays derives the tag
from --runtime-include; nothing tied it to the emitting binary). The stale
shards corrupted the display-list task queue during load-game. NOT the
IRQ-resume class the prior handoff claimed - disproven with the new ring.
- recompiler: bake the emitter-source hash (shared canonical list
runtime/codegen_hash_sources.cmake + hash_codegen.cmake) into psxrecomp-game;
new --codegen-hash flag prints it (machine-parseable, pre-banner).
- compile_overlays.py: HARD-FAIL when the recompiler binary's baked hash
differs from the cg tag hash it stamps (or the binary lacks the flag).
Applies to both cache and --static modes. Closes the read==write-tag /
stale-content drift class structurally.
- runtime.cmake: codegen-hash source list moved to the shared canonical file.
- interrupts.c: always-on exception-EXIT half added to irqctx_ring (take_pc,
real_epc, exit_pc, escape reason, same-thread/restore flags, v1/ra
saved-vs-exit, RestoreState redirect count) - proves per delivery which
escape path fired and whether the interrupted GPRs were restored. Kept the
same_thread_resume GPR-restore refinement (ring-verified equal-value in
practice; faithful: hardware restores all GPRs on every exception return).
- debug_server.c: irqctx_ring dump extended with the exit-half fields.
Validated live: Tomba menu opens on loaded save (Stormy Mountain) with the
cache fully enabled after regenerating shards with a rebuilt recompiler
(build-cosim + build-prod caches). Guard verified positive and negative.
MMX6 gate passed: boot -> title -> opening cutscene -> gameplay handoff OK.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Matthew Stanley