Tier: 3

This target supports C-SKY CPUs with abi v2 and glibc.

https://c-sky.github.io/ https://gitlab.com/c-sky/

Target maintainers


Building the target

Get a C toolchain

Compiling rust for this target has been tested on x86_64 linux hosts. Other host types have not been tested, but may work, if you can find a suitable cross compilation toolchain for them.

If you don't already have a suitable toolchain, you can download from here, and unpack it into a directory.

Configure rust

The target can be built by enabling it for a rustc build, by placing the following in config.toml:

target = ["x86_64-unknown-linux-gnu", "csky-unknown-linux-gnuabiv2"]
stage = 2

cc = "${TOOLCHAIN_PATH}/bin/csky-linux-gnuabiv2-gcc"

### Build

# in rust dir
./x.py build --stage 2

Building and Running Rust programs

To test cross-compiled binaries on a x86_64 system, you can use the qemu-cskyv2. This avoids having a full emulated ARM system by doing dynamic binary translation and dynamic system call translation. It lets you run CSKY programs directly on your x86_64 kernel. It's very convenient!

To use:

  • Install qemu-cskyv2 (If you don't already have a qemu, you can download from here, and unpack it into a directory.)
  • Link your built toolchain via:
    • rustup toolchain link stage2 ${RUST}/build/x86_64-unknown-linux-gnu/stage2
  • Create a test program
cargo new hello_world
cd hello_world
  • Build and run
CARGO_TARGET_CSKY_UNKNOWN_LINUX_GNUABIV2_RUNNER=${QEMU_PATH}/bin/qemu-cskyv2 -L ${TOOLCHAIN_PATH}/csky-linux-gnuabiv2/libc \
RUSTFLAGS="-C target-features=+crt-static" \
cargo +stage2 run --target csky-unknown-linux-gnuabiv2

Attention: The dynamic-linked program may nor be run by qemu-cskyv2 but can be run on the target.