0xrsydn/gameboy-rust
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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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README.md
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@ -41,7 +41,7 @@ Use `--test-suite suite.json` for [repeatable headless ROM assertions](docs/rom-
| [docs/development.md](docs/development.md) | Nix, direnv, and macOS build notes |
| [docs/testing.md](docs/testing.md) | Validation commands and what the test suites cover |
| [docs/rom-tests.md](docs/rom-tests.md) | Headless ROM suites, completion checks, assertions, and JSON reports |
| [docs/public-arm-tests.md](docs/public-arm-tests.md) | Pinned public ARM test, preparation command, and known failures |
| [docs/public-arm-tests.md](docs/public-arm-tests.md) | Pinned public ARM test, preparation command, results, and limits |
| [docs/architecture.md](docs/architecture.md) | Crate boundaries and a file-by-file map |
| [docs/hardware/cpu.md](docs/hardware/cpu.md) | ARM/Thumb execution rules, modes, exceptions, and timing |
| [docs/hardware/cartridge.md](docs/hardware/cartridge.md) | ROM loading, window/input controls, original ROM generator, and diagnostics |