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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

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