How to enable Zicsr extension support on qemu-riscv32?

[Tommy Murphy]

Hi there

I've tried searching to find an answer to this question but with no success so far unfortunately.

The issue is discussed here: https://github.com/riscv-collab/riscv-gnu-toolchain/issues/1278#issuecomment-1606108826

But the gist is that I can configure, build and use `qemu-riscv32` to run a simple bare metal "hello world" program fine.

But if I add a CSR read instruction to it (e.g. `asm("csrr t0, misa");`) then I get Illegal Instruction.

This is the case even if I use `qemu-riscv32 -cpu rv32,Zicsr=on hello.exe`.

How can I configure/invoke `qemu-riscv32` so that I can emulate CSR instructions?

Thanks a lot

Regards

Tommy