csky-unknown-linux-gnuabiv2

Tier: 3

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

Reference:

• CSKY ABI Manual
• csky-linux-gnuabiv2-toolchain
• csky-linux-gnuabiv2-qemu

other links:

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

Target maintainers

• @Dirreke

Requirements

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:

[build]
target = ["x86_64-unknown-linux-gnu", "csky-unknown-linux-gnuabiv2", "csky-unknown-linux-gnuabiv2hf"]
stage = 2

[target.csky-unknown-linux-gnuabiv2]
# ADJUST THIS PATH TO POINT AT YOUR TOOLCHAIN
cc = "${TOOLCHAIN_PATH}/bin/csky-linux-gnuabiv2-gcc"

[target.csky-unknown-linux-gnuabiv2hf]
# ADJUST THIS PATH TO POINT AT YOUR TOOLCHAIN
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 ${TOOLCHAIN_PATH}/csky-linux-gnuabiv2/libc \
CARGO_TARGET_CSKY_UNKNOWN_LINUX_GNUABIV2_LINKER=${TOOLCHAIN_PATH}/bin/csky-linux-gnuabiv2-gcc \
RUSTFLAGS="-C target-feature=+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.