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feat(memory): support ARM unused-memory open-bus reads

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Snapshot mapped PC+8 bytes for ARM data reads in the documented unused ranges. Preserve strict host/fetch/Thumb/DMA diagnostics, missing-ROM errors, existing write rules, and nominal timing. Add original regressions and document the bounded model.

The unmodified pinned jsmolka ARM ROM now reaches its verified checkpoint with r12=0 in debug and release: 1344 steps and 11257 nominal cycles. No ROM, manifest, or assertion changes.

Validated on Darwin arm64: 842 workspace tests in debug and release; 773 core/demo tests separately; Python adapter tests; native ROM windows; all ten demo window smoke tests; fmt, clippy, and rustdoc.
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0xrsydn 2026-10-05 20:25:18 +07:00
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docs/rom-tests.md
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@ -130,8 +130,9 @@ They do not hash ROM contents; record source revisions and file checksums alongs
## Next validation stage
The first public integration is [jsmolka/gba-tests ARM](public-arm-tests.md), with a verified result-register checkpoint and a known failing baseline.
Investigate its next unsupported high-address read at test 362 before claiming the full ARM ROM passes.
The first public integration is [jsmolka/gba-tests ARM](public-arm-tests.md), with a verified result-register checkpoint.
The pinned ARM ROM now passes this checkpoint on Darwin arm64. Historical failures remain documented.
Next, integrate a pinned public Thumb suite with a verified result protocol.
For further public ARM7TDMI/GBA tests, inspect their source, license, entry assumptions, and result protocol.
Pin source revisions and build instructions before comparing emulator changes.
Adapt suites to verified completion addresses and result locations; do not guess them or treat timeouts as passes.