by Benjamin Landers

RISC-V Assembler and Runtime Simulator

RARS, the RISC-V Assembler, Simulator, and Runtime, will assemble and simulate the execution of RISC-V assembly language programs. Its primary goal is to be an effective development environment for people getting started with RISC-V.


  • RISC-V IMFDN Base (riscv32 and riscv64)
  • Several system calls that match behaviour from MARS or SPIKE.
  • Support for debugging using breakpoints and/or ebreak
  • Side by side comparison from psuedo-instruction to machine code with intermediate steps
  • Multifile assembly using either files open or a directory

Environment Variables:

  • RARS_JAVA (Default: none): Passes arguments directly to the Java command (Will override other environment variables)
  • RARS_SCALE (Default: Screen width / 1920): Sets the sun.java2d.uiScale property (See documentation at https://news.kynosarges.org/2019/03/24/swing-high-dpi-properties/)

Changes in version v1.6

about 1 month ago
Installed Size~185 MB
Download Size63 MB
Available Architecturesaarch64, x86_64
LicenseMIT License

Installs over time

Manual Install

Make sure to follow the setup guide before installing

flatpak install flathub io.github.TheThirdOne.rars


flatpak run io.github.TheThirdOne.rars