43 lines
1.4 KiB
Markdown
43 lines
1.4 KiB
Markdown
# ppc750cl
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Rust tools for working with the PowerPC 750CL family of processors.
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### Rust crates
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```shell
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cargo run --package ppc750cl-genisa
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cargo build --release
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```
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### Instruction Set
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For those unfamiliar with PowerPC, here are some basics.
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- PowerPC 7xx is a family of RISC CPUs produced from 1997 to 2012.
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- They operate with 32-bit words and every instruction is 32-bits wide.
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- This project focuses (only) on compatibility with the PowerPC 750CL.
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- This chip is famously packaged as codename "Broadway" for the Nintendo Wii.
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- Its predecessor PowerPC 750CXe is used in the Nintendo GameCube.
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- It adds a "paired-singles" SIMD unit and a bunch of other instructions.
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### isa.yaml
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The file [isa.yaml](./isa.yaml) contains a full definition of the PowerPC 750CL instruction set.
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It powers the disassembler and assembler.
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Similarly to LLVM TableGen, the program `ppc750cl-genisa` generates a Rust file implementing an instruction decoder.
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### Safety & Correctness
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- This project does not use `unsafe` Rust code outside of testing utils.
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- The disassembler has been fuzzed over all ~4.29 billion possible instructions (via `ppc750cl-fuzz`).
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- It is safe to run the disassembler over untrusted byte arrays.
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- However, no guarantees on correctness are made (yet). Expect bugs.
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### Performance
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With a single thread on Ryzen 9 3900X:
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- Disassembling & printing: ~5M insn/s (~20 MB/s)
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- Disassembling only: ~50M insn/s (~200 MB/s)
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