This will build the RISC-V toolchain under /opt/riscv which requires sudo. You can use a different directory. The RISC-V GCC toolchain can also be installed prebuilt from most linux package managers.
Installation
RISC-V GCC
sudo apt-get install autoconf automake autotools-dev curl python3 libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev libexpat-dev
git clone https://github.com/riscv-collab/riscv-gnu-toolchain.git
cd riscv-gnu-toolchain
./configure --prefix=/opt/riscv --with-arch=rv64gc --with-abi=lp64d
sudo make
then add /opt/riscv/bin to $PATH and restart (pk requires a RISC-V compiler)
pk
cd ..
git clone https://github.com/riscv-software-src/riscv-pk.git
cd riscv-pk
mkdir build
cd build
../configure --prefix=/opt/riscv --host=riscv64-unknown-elf
make
sudo make install
Spike
cd ..
sudo apt-get install device-tree-compiler
git clone https://github.com/riscv-software-src/riscv-isa-sim
cd riscv-isa-sim
mkdir build
cd build
../configure --prefix=/opt/riscv
make
sudo make install
Usage
Create a sample test.c file.
Then:
riscv64-unknown-elf-gcc test.c
spike --isa=RV64GC pk a.out
This will cross-compile the file for RISC-V, specifically the RV64GC extension (or whatever extension is passed in the GCC flags), and simulate its execution in the Spike RISC-V emulator. pk is a proxy kernel that intercepts syscalls in what’s otherwise bare-metal code.