ppc750cl

Rust tools for working with the PowerPC 750CL / 750CXe family of processors.

Building

cargo run --package ppc750cl-genisa
cargo build --release

Instruction Set

For those unfamiliar with PowerPC, here are some basics.

• PowerPC 7xx is a family of RISC CPUs produced from 1997 to 2012.
  • They operate with 32-bit words and every instruction is 32-bits wide.
• This project focuses (only) on compatibility with the PowerPC 750CL and 750CXe.
  • PowerPC 750CL ("Broadway") is used in the Nintendo Wii.
  • PowerPC 750CXe ("Gekko") is used in the Nintendo GameCube.
  • They add a "paired-singles" SIMD unit and a bunch of other instructions.

isa.yaml

The file isa.yaml contains a full definition of the PowerPC 750CL / 750CXe instruction set.

It powers the disassembler and assembler.

Similarly to LLVM TableGen, the program ppc750cl-genisa generates a Rust file implementing an instruction decoder.

Safety & Correctness

• The disassembler has been fuzzed over all ~4.29 billion possible instructions (via ppc750cl-fuzz).
• It is safe to run the disassembler over untrusted byte arrays.
• However, no guarantees on correctness are made (yet). Expect bugs.

Performance

With a single thread on Ryzen 9 3900X:

• Disassembling & printing: ~12M insn/s (~50 MB/s)
• Disassembling only: ~275M insn/s (~1 GB/s)