How to use RISC-V custom instructions with Ubuntu

Introduction My previous blog talked about the importance of instruction set standardization for ecosystem stability and growth through the use of profiles. And standardization is indeed important, but since one of RISC-V’s great benefits is the ability to customize the instruction set, we should also consider how to support that ability. This blog looks at what is needed in the software layer to support hardware custom instructions and how you can make that work with Ubuntu.