riscv-isa-sim VS tinyemu

Someone correct me if I'm wrong, but Spike is considered the gold standard for RISV-V simulation, in terms of support for extensions and overall correctness. As I understand it, QEMU is faster and easier to use for day-to-day for general software development.

Spike is an RISC-V instruction set simulator: https://github.com/riscv-software-src/riscv-isa-sim

I really like the source code for the Spike RISC-V ISA Simulator. It's not very heavily commented, though, so you really need to read the code.

If you want to run bare metal with no RTOS, it should be possible, but you will need to replace the main startup program (https://github.com/riscv-software-src/riscv-isa-sim/blob/master/spike_main/spike.cc) with some program to set up the hardware and instantiate the simulator, load the OS image etc and then have a decent runtime environment to that supports malloc() etc and redirect IO to serial or flash memory etc. There is a bit of work you would need to do.

I guess you will also use Spike and the Sail model for RISC-V.

>"TinyEMU is a system emulator for the RISC-V and x86 architectures.

Its purpose is to be

small and simple

while being complete.

Main features:

o RISC-V system emulator supporting the RV128IMAFDQC base ISA (user level ISA version 2.2, priviledged architecture version 1.10) including:

o 32/64/128 bit integer registers

o 32/64/128 bit floating point instructions (using the SoftFP Library)

o Compressed instructions

o Dynamic XLEN change

o x86 system emulator based on KVM

o VirtIO console, network, block device, input and 9P filesystem

o Graphical display with SDL

o JSON configuration file

o Remote HTTP block device and filesystem

o Small code, easy to modify, few external dependancies

o Javascript version running Linux and Windows 2000."

Related:

GitHub user jhhuh's copy of the RISC-V emulator source code: https://github.com/jhhuh/tinyemu (easier to browse)