Instructions

• Install all needed libraries

$ sudo apt-get install autoconf automake autotools-dev curl libmpc-dev libmpfr-dev libgmp-dev libusb-1.0-0-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev device-tree-compiler pkg-config libexpat-dev python3

• Clone riscv-gnu-toolchain and riscv-tools + update the riscv-tools repository

$ git clone --recursive https://github.com/riscv/riscv-tools.git
$ git clone --recursive https://github.com/riscv/riscv-gnu-toolchain.git
$ cd ./riscv-tools && git submodule foreach --recursive git pull origin master

• The order to access the repos is:

1. riscv-opcodes: Running make, the result is an encoding.h file that includes all the RISC-V instructions located inside the repo. In order to add the instructions to the toolchain, edit the riscv-opc.h file located in the /riscv-gnu-toolchain/riscv-gdb/include/opcode/ directory and in /riscv-gnu-toolchain/riscv-binutils/include/opcode/ directory, by adding the definitions of the instructions which are stored in the encoding.h file. Lastly, edit the riscv-opc.c file located in the /riscv-gnu-toolchain/riscv-gdb/opcodes/ directory and in the /riscv-gnu-toolchain/riscv-binutils/opcodes/ directory, specifically the riscv_opcodes struct. You could use this diploma thesis as reference - see chapter 6.6 (specifically 6.6.6 and onwards)
2. riscv-gnu-toolchain: Necessary step for all the remaining repos.
3. riscv-isa-sim
4. riscv-pk
5. riscv-tests
6. riscv-openocd