0xrsydn/gameboy-rust
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fix(bios): preserve documented protected-read words at firmware exits

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Place skipped compatibility data at boot, SoftReset, SWI, and IRQ exit PC+8 locations. Preserve the real IRQ callback return instruction as its readback word. Keep CPU and memory behavior image-derived, including caller-supplied images.

Add original boundary, load-lane, caller-state, wait, supplied-image, and builder-fixup regressions. Document the historical failures, research decision, passing public BIOS checkpoint, and remaining fetch-history limits.

Validated on Darwin arm64: 868 workspace tests in debug and release; 799 core/demo tests separately in both profiles; 39 preparation tests; native ROM window tests in both profiles; ten graphics/window smoke modes; fmt, clippy, and rustdoc. Hash-verified public ARM, Thumb, memory, and BIOS suites pass unchanged with identical debug/release reports. BIOS: r12=0, 17606 steps, 197456 nominal cycles, one IRQ entry.
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0xrsydn 2026-10-06 00:37:20 +07:00
commit efdc288db6
15 changed files with 387 additions and 34 deletions
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docs/public-thumb-tests.md
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@ -82,7 +82,8 @@ Existing empty-list expectations that incorrectly required PC+4 were corrected;
See [CPU transfer semantics](hardware/cpu.md#instruction-demo-and-execution-rules).
This proves only the pinned suites' checkpoints and assertions, not complete CPU, bus, or timing compatibility.
The [pinned public memory ROM](public-memory-tests.md) also passes, with documented video-byte coverage limits.
No public timing, BIOS, graphics, save, or unsafe suite is claimed as passing.
The [public BIOS read-protection ROM](public-bios-tests.md) has a separate bounded passing result.
No public timing, graphics, save, or unsafe suite is claimed as passing.
These results do not establish Pokémon Emerald compatibility.
## References