rusty-riscv-ave: A simple riscv64 emulator in rust

inspired by rvemu and Rare.

TODOS

My implementation works fine in previous 9 steps, but failed to boot xv6's kernel in the last lab, so I use the cpu.rs from rare, it just works.

I'm trying to figure out the reason now, I'm so tired.

Usage

cargo run --release <path-to-kernel-binary> <path-to-file-system>

Tips

To compile xv6 for the emulator, you should use xv6's 2020 version, because the new version uses VIRTIO_VERSION 2, this is not supported.

git clone git://g.csail.mit.edu/xv6-labs-2020
cd xv6-labs-2020

You need to modify the makefile, add -march=rv64imazicsr -mabi=lp64 to CFLAGS and remove asm volatile ("wfi") in kernel/proc.c since we don't support riscv's D, F and C extension and the wfi instruction.

Additionally, you may have to compile the kernel/*.S files manually with the flag above.

Then do

make
llvm-objcopy --strip-all -O binary kernel/kernel ./kernel.bin

Then go back to the emulator directory, run

cargo run --release <path-to-kernel-binary> <path-to-file-system>

And enjoy it.