riscv64_asm

This repository contains 64 bits RISCV assembly files from beginning to expert level.

Setup a Ubuntu for RISCV 64 Virtual Machine with QEMU

First Step - Install Prerequistites

$ sudo apt-get update
$ sudo apt-get install opensbi qemu-system-misc u-boot-qemu

Second Step - Download, unpacking and resize Ubuntu image

For RISC-V computers. Requires copying your own first stage bootloader (like u-boot) and relevant DTBs onto the image before usage on real hardware (like the SiFive HiFive Unmatched). Usable on RISC-V QEMU.

• Download Ubuntu Image

$ mkdir -p /opt/ubuntu
$ cd /opt/ubuntu
$ sudo chown -R [YOUR_USERNAME]:[YOUR_GROUP] /opt/ubuntu
$ wget https://cdimage.ubuntu.com/releases/[UBUNTU_VERSION]/release/ubuntu-[UBUNTU_VERSION]-preinstalled-server-riscv64.img.xz

• Unpacking Image and Resize

$ xz -dk ubuntu-[UBUNTU_VERSION]-preinstalled-server-riscv64.img.xz
$ qemu-img resize -f raw ubuntu-[UBUNTU_VERSION]-preinstalled-server-riscv64.img +10G

Third Step - Create a startup Virtual Machine's script:

• Create a startup.sh:

touch /opt/ubuntu/startup.sh

• Run this command below to copy qemu start command to the startup.sh file

echo '#!/bin/bash \

qemu-system-riscv64 \
  -machine virt -nographic -m 4G -smp 4 \
  -bios /usr/lib/riscv64-linux-gnu/opensbi/generic/fw_jump.bin \
  -kernel /usr/lib/u-boot/qemu-riscv64_smode/uboot.elf \
  -device virtio-net-device,netdev=eth0 -netdev user,id=eth0 \
  -device virtio-rng-pci \
  -drive file=ubuntu-24.04-preinstalled-server-riscv64.img,format=raw,if=virtio' > /opt/ubuntu/startup.sh

• Give execution permission to startup.sh file:

$ sudo chmod a+x /opt/ubuntu/startup.sh

Fourth Step - Run script

$ ./opt/ubuntu/startup.sh

Fifth Step - Ubutun Log in

To login to Ubuntu the default username and password are 'ubuntu'

Run Assembly file

• Run with makefile To run the assembly files in this repository, for example '02_hello' with target '02' just execute in the root path the command below:

$ make run target_dir=02 -s

• Run without makefile In Ubuntu virtual machine, to run assembly file execute this commands below:

$ as -o output.out [FILE].s
$ ld -o output output.out
$ ./output