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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
commit a9493d4cc6
11 changed files with 418 additions and 26 deletions
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AGENTS.md
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@ -34,7 +34,7 @@ Window smoke tests (`--*-smoke-test`) need a logged-in desktop session. Details
| Working on | Read |
| --- | --- |
| ARM/Thumb instructions, modes, exceptions, timing | [docs/hardware/cpu.md](docs/hardware/cpu.md) |
| Pinned public ARM tests and known compatibility failures | [docs/public-arm-tests.md](docs/public-arm-tests.md) |
| Pinned public ARM tests, results, and compatibility limits | [docs/public-arm-tests.md](docs/public-arm-tests.md) |
| ROM test suites, assertions, and JSON reports | [docs/rom-tests.md](docs/rom-tests.md) |
| ROM files, window execution, and terminal diagnostics | [docs/hardware/cartridge.md](docs/hardware/cartridge.md) |
| BIOS services (SWI) | [docs/hardware/bios.md](docs/hardware/bios.md) |