[nix] add sail riscv model builder #780
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Signed-off-by: Avimitin <[email protected]>
Disambiguation: * sail: the official sail language, library, API, headers that belongs to rem-project. * sail-riscv: the riscv spec definition describe using sail. Build step: 1. Use rust-bindgen to create Rust FFI to the sail header, so that we can always keep integrity of the sail library. 2. Extern declare all necessary C function define in generated model from sail and sail-riscv. 3. Define or override necessary functions from our Rust side. Current issues: * Implement our Rust emulator using above strategy inevitably create a programming model that functions will be called back and forth from both C and Rust side. This will also make the code hard to read. Hope this situation could be improved in upcomming rational documents. * Although sail support using different prefix for its model declaration when generating C sources, I am still afraid that these global machine state in sail-riscv model will cause problem in our future development. Signed-off-by: Avimitin <[email protected]>
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