Alexandros Mandravillis
4d9060a54e
codegen: stale-static guard on inter-piece host transfers
...
A game that overlays its own text at runtime (CMR2 streams transform-
loop variants with patched projection constants over the boot EXE)
kept executing the stale static translation through inter-piece host
transfers: dispatch validates an entry's emitted ranges, but split
function pieces chain via direct host calls (fallthrough to split
piece / next function, legacy non-CPS split branch/jump/continuation
transfers, non-CPS direct jal) with no revalidation. A clean entry
piece falls through natively into a stale sibling whose live bytes an
overlay replaced -- the CMR2 attract/gameplay wedge corruption
(first divergence: one ADDI immediate, screen-center 160 static vs
256 live, at 0x800199D4, retirement 3,203,596,289, frame ~11963).
Emit at every such transfer:
if (!psx_game_text_native_ok(T)) { cpu->pc = T; return; }
publishing the PC and unwinding to the trampoline, whose dispatch
takes the sanctioned dirty-RAM-interpreter fallback over live bytes.
The non-CPS direct jal falls back to call_by_address instead.
dirty_ram_text_native_ok_ranges_from gains a page-clean fast path
(skip the memcmp when no touched page is guard-modified or runtime-
dirty) so the guards are near-free on pristine pages.
cosim.py: print full A/B cpu dumps in cpudiff mode (values, not just
diffs).
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