mini-rv32ima

I just had a look at the code and it is indeed very compact. I haven't compiled or used it. Looks like RISC-V 32-bit integer and multiply and atomic instr extension. Floating point supported when compiling via gcc or similar the example apps (not by the emulator itself but by the compiler emiting the required software functions to emulate the floating point operations instead). I think it is very clever. Very compact instruction set, with the advantage of being supported by several compilers. Wrapper over this other project which is the one implementing the instruction set itself: https://github.com/cnlohr/mini-rv32ima Kudos to both projects.

cnlohr is in his own league, this guy is bordering on genius. Dissatisfied with the state of the vendor SDK for CH32V003 microcontrollers (ultra-cheap RISC-V MCUs), he created his own [1], which is a pleasure to use. He also has a header-only RISC-V emulator that runs Linux (and Doom!) [2], and hacked an ESP32 to emit valid LORA frames with clever use of aliasing [3]. [1] https://github.com/cnlohr/ch32v003fun [2] https://github.com/cnlohr/mini-rv32ima [3] https://www.youtube.com/watch?v=eIdHBDSQHyw

It does emulate risc-v that runs Linux, so why not call it a Linux emulator? Though https://github.com/cnlohr/mini-rv32ima is indeed impressively small. Here's the dispatch switch-case: https://github.com/cnlohr/mini-rv32ima/blob/eeeaaa0609558c84...

Not GP, but this might scratch your itch https://github.com/cnlohr/mini-rv32ima

So is this, even more so in my taste: https://github.com/cnlohr/mini-rv32ima/blob/master/mini-rv32... A RISC-V emulator in one include file.