RISC-V Web Emulation and Assembly

This page is about RISC-V emulators, simulators, and simple and cheap solution to have displayed output

Main emulators:

• Fabrice Bellard's TinyEmu, RV32 bits only and Qemu (RV64 and RV32). He also created VFsync to allow to share VM data between web and hosts
• LeKKit RVVM RV64 and RV32, very fast, manage lot of features, still no sound.
• fwsGonzo libriscv RV64 and RV32, very fast, low latency, for game emulation purpose, rvscript, RISC-V based scripting backend, benchmarks tools
• WASM RISC-V emulator RV32 only
• JuiceVM minimalistic RV64 VM that support M/U/S modes, minimal UART, MMU and interrupts. Can run freertos and rt-thread embedded OS.

Simulators for RISC−V assembly prupose

• Spike RV64 and RV32 simulator, manage most if not all extensions
• RARS, Java application derived from MIPS simulator, MARS, it contains a limited RISC-V subset instructions, looks like no more maintained, mainly for education purpose, contain a small SPIKE and Linux like API, to display integer, floats etc values, and better understand. Follow Archlinux PKGBUILD to understand how to install it, as there is no documentation about this.
• RISC-V Interpreter, light and dynamic web interface for simulating RISC-V
• QtRvSim WebAssembly RISC-V CPU simulator for education (Online demo)
• MSIM (sources) RISC-V (RV32, multicore, Supervisor and User mode) and MIPS simulator. Try to be compatible instead of fast, simulate several peripherals.
• Ripes, (|online demo](https://ripes.me/)), web based (using Qt for WebAssembly) RV64 and RV32 5-stage RISC-V pipeline simulator, with logical unit, cache and memory visualisation.
• Jupiter, RV32IMF Assembler and Runtime Simulator
• Venus (frontend, online demo) browser and JVM RV32IM simulator for education with integrated CodeMirror editor.

ESP32-VGA

A minimal interesting solution is to connect RISC−V version of ESP32 with VGA connector as done with this ESP32-S3 (this model is not RISC-V, ESP32-C2, C3, all the H* models and the far more expansive P4, are RISC-V):

• Instructables recipe, JPR Alves version (640x350 pixels)
• Bitulini's ESP32Lib, Bitulini's ready product Hack a Day article, Adafruit article (up to 16-bit 1024×768 pixels)
• Lilygo most compact and cheap version with audio Jack and 2 PS/2 after Bitulini's one
• aready made FabGL product documentation, this one support sounds and ps/2 controllers, but is (Out of stock)

Desktop and server systems:

Linux

• GNU/Linux
• JSLinux gives different TinyEmu ready configurations
• RVVM test (prebuilt files, live demo)

Autres

• Haiku
• BSD

Embedded systems:

• Apache NuttX NuttX manage a bunch of SoC now Lup Yuen Lee port to TinyEmu

Assembly courses

• Project F have several RISC-V Assembler courses, including Arithmetic, Logical, Jump and Function and a RISC-V Assembler Cheat Sheet
• Twilco's blog contains 4 fundamentals courses called RISC-V from scratch, 1. Introduction, toolchain setup, and hello world!, 2.Hardware layouts, linker scripts, and C runtimes, 3. Writing a UART driver in assembly (1/2), 4. Creating a function prologue for our UART driver (2/3).
• Robert Twinkler RISC-V book, to use with RARS simulator and its included system like library, with more spcecialized output functions.
• An assembler Programmer's Manual by P. Dabbelt, M. Clark and A. Bradbury
• A RISC-V Assembler Reference by Michael J. Clark
• imperial Violet's RISC-V Assembly
• My own courses on Syscall with RISC-V Assembly (need to update some parts of the syntax, due to more restrictive syntax in GCC 14)
• SSE2RVV is SEE SIMD to RISC-V vector processor extenton converter