diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..84c048a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/build/
diff --git a/Rakefile b/Rakefile
new file mode 100755
index 0000000..81d54a2
--- /dev/null
+++ b/Rakefile
@@ -0,0 +1,347 @@
+#!/usr/bin/env ruby
+# This Source Code Form is subject to the terms of the Mozilla Public License,
+# v. 2.0. If a copy of the MPL was not distributed with this file, You can
+# obtain one at https://mozilla.org/MPL/2.0/. -}
+
+# frozen_string_literal: true
+
+require 'uri'
+require 'net/http'
+require 'open3'
+require 'etc'
+require 'fileutils'
+require 'pathname'
+require 'rake/clean'
+
+TMP = Pathname.new('./build')
+
+CLOBBER.include 'build'
+
+def gcc_verbose(gcc_binary)
+  read, write = IO.pipe
+  system({'LANG' => 'C'}, gcc_binary, '--verbose', err: write)
+  write.close
+  output = read.read
+  read.close
+  output
+end
+
+class BuildTarget
+  def initialize(architecture)
+    case architecture
+    when /^r(isc)?v32$/
+      @architecture = :rv32
+    else
+      raise "Unsupported architecture '#{architecture}'."
+    end
+  end
+
+  def sysroot
+    TMP + 'sysroot'
+  end
+
+  def rootfs
+    TMP + 'rootfs'
+  end
+
+  def target
+    case @architecture
+    when :rv32
+      'riscv32-unknown-linux-gnu'
+    end
+  end
+
+  def build
+    @build ||= gcc_verbose(ENV['CC']).lines
+      .find { |line| line.start_with? 'Target: ' }
+      .split(' ').last.strip
+  end
+
+  def configuration
+    case @architecture
+    when :rv32
+      ['--with-arch=rv32imafdc', '--with-abi=ilp32d', '--with-tune=rocket', '--with-isa-spec=20191213']
+    else
+      []
+    end
+  end
+end
+
+def download_and_unarchive(url)
+  case File.extname url.path
+  when '.bz2'
+    archive_type = '-j'
+    root_directory = File.basename url.path, '.tar.bz2'
+  when '.xz'
+    archive_type = '-J'
+    root_directory = File.basename url.path, '.tar.xz'
+  else
+    raise "Unsupported archive type #{url.path}."
+  end
+  target = TMP + 'tools'
+  Net::HTTP.start(url.host, url.port, use_ssl: url.scheme == 'https') do |http|
+    request = Net::HTTP::Get.new url.request_uri
+
+    http.request request do |response|
+      case response
+      when Net::HTTPRedirection
+        download_and_unarchive URI.parse(response['location'])
+      when Net::HTTPSuccess
+        Open3.popen2 'tar', '-C', target.to_path, archive_type, '-xv' do |stdin, stdout, wait_thread|
+          Thread.new do
+            stdout.each { |line| puts line }
+          end
+
+          response.read_body do |chunk|
+            stdin.write chunk
+          end
+          stdin.close
+
+          wait_thread.value
+        end
+      else
+        response.error!
+      end
+    end
+  end
+  target + root_directory
+end
+
+def configure_make_install(source_directory, configure_options, env, cwd)
+  configure = source_directory.relative_path_from(cwd) + 'configure'
+  system env, configure.to_path, *configure_options, chdir: cwd.to_path, exception: true
+  system 'make', '-j', Etc.nprocessors.to_s, chdir: cwd.to_path, exception: true
+  system env, 'make', 'install', chdir: cwd.to_path, exception: true
+end
+
+directory(TMP + 'tools')
+
+namespace :cross do
+  BINUTILS_VERSION = '2.44'
+  GLIBC_VERSION = '2.41'
+  KERNEL_VERSION = '5.15.185'
+  GCC_VERSION = "15.1.0"
+
+  task :environment, :target do |t, args|
+    binary_suffix = ''
+    output = gcc_verbose 'gcc'
+
+    if output.start_with? 'Apple clang'
+      binary_suffix = "-#{GCC_VERSION.split('.').first}"
+    end
+
+    ENV['CC'] = "gcc#{binary_suffix}"
+    ENV['CXX'] = "g++#{binary_suffix}"
+  end
+
+  desc 'Build cross binutils'
+  task :binutils, [:target] => :environment do |t, args|
+    options = BuildTarget.new args[:target]
+    source_directory = download_and_unarchive(
+      URI.parse("https://ftp.gnu.org/gnu/binutils/binutils-#{BINUTILS_VERSION}.tar.xz"))
+
+    cwd = source_directory.dirname + 'build-binutils'
+    cwd.mkpath
+    options.rootfs.mkpath
+
+    env = ENV.slice 'CC', 'CXX'
+    configure_options = [
+      "--prefix=#{options.rootfs.realpath}",
+      "--target=#{options.target}",
+      '--disable-nls',
+      '--enable-gprofng=no',
+      '--disable-werror',
+      '--enable-default-hash-style=gnu',
+      '--disable-libquadmath'
+    ]
+    configure_make_install source_directory, configure_options, env, cwd
+  end
+
+  desc 'Build stage 1 GCC'
+  task :gcc1, [:target] => :environment do |t, args|
+    options = BuildTarget.new args[:target]
+    source_directory = download_and_unarchive(
+      URI.parse("https://gcc.gnu.org/pub/gcc/releases/gcc-#{GCC_VERSION}/gcc-#{GCC_VERSION}.tar.xz"))
+
+    cwd = source_directory.dirname + 'build-gcc'
+    cwd.mkpath
+    options.rootfs.mkpath
+    options.sysroot.mkpath
+
+    system 'contrib/download_prerequisites', chdir: source_directory.to_path, exception: true
+    configure_options = options.configuration + [
+      "--prefix=#{options.rootfs.realpath}",
+      "--with-sysroot=#{options.sysroot.realpath}",
+      '--enable-languages=c,c++',
+      '--disable-shared',
+      '--disable-bootstrap',
+      '--disable-multilib',
+      '--disable-libmudflap',
+      '--disable-libssp',
+      '--disable-libquadmath',
+      '--disable-libsanitizer',
+      '--disable-threads',
+      '--disable-libatomic',
+      '--disable-libgomp',
+      '--disable-libvtv',
+      '--disable-libstdcxx',
+      '--disable-nls',
+      '--with-newlib',
+      '--without-headers',
+      "--target=#{options.target}",
+      "--build=#{options.build}",
+      "--host=#{options.build}"
+    ]
+    flags = '-O2 -fPIC'
+    env = {
+      'CC' => ENV['CC'],
+      'CXX' => ENV['CXX'],
+      'CFLAGS' => flags,
+      'CXXFLAGS' => flags,
+      'PATH' => "#{options.rootfs.realpath + 'bin'}:#{ENV['PATH']}"
+    }
+    configure_make_install source_directory, configure_options, env, cwd
+  end
+
+  desc 'Copy glibc headers'
+  task :headers, [:target] => :environment do |t, args|
+    options = BuildTarget.new args[:target]
+    source_directory = download_and_unarchive(
+      URI.parse("https://ftp.gnu.org/gnu/glibc/glibc-#{GLIBC_VERSION}.tar.xz"))
+    include_directory = TMP + 'tools/include'
+
+    include_directory.mkpath
+    FileUtils.cp (source_directory + 'elf/elf.h'), (include_directory + 'elf.h')
+  end
+
+  desc 'Build linux kernel'
+  task :kernel, [:target] => :environment do |t, args|
+    options = BuildTarget.new args[:target]
+    cwd = download_and_unarchive(
+      URI.parse("https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-#{KERNEL_VERSION}.tar.xz"))
+
+    env = {
+      'CROSS_COMPILE' => "#{options.target}-",
+      'ARCH' => 'riscv',
+      'PATH' => "#{options.rootfs.realpath + 'bin'}:#{ENV['PATH']}",
+      'HOSTCFLAGS' => "-D_UUID_T -D__GETHOSTUUID_H -I#{TMP + 'tools/include'}"
+    }
+    system env, 'make', 'rv32_defconfig', chdir: cwd.to_path, exception: true
+    system env, 'make', '-j', Etc.nprocessors.to_s, chdir: cwd.to_path, exception: true
+    system env, 'make', 'headers', chdir: cwd.to_path, exception: true
+
+    user_directory = options.sysroot + 'usr'
+
+    user_directory.mkpath
+    FileUtils.cp_r (cwd + 'usr/include'), (user_directory + 'include')
+  end
+
+  desc 'Build glibc'
+  task :glibc, [:target] => :environment do |t, args|
+    options = BuildTarget.new args[:target]
+    source_directory = TMP + "tools/glibc-#{GLIBC_VERSION}"
+    configure_options = [
+      '--prefix=/usr',
+      "--host=#{options.target}",
+      "--target=#{options.target}",
+      "--build=#{options.build}",
+      "--enable-kernel=#{KERNEL_VERSION}",
+      "--with-headers=#{options.sysroot.realpath + 'usr/include'}",
+      '--disable-nscd',
+      '--disable-libquadmath',
+      '--disable-libitm',
+      '--disable-werror',
+      'libc_cv_forced_unwind=yes'
+    ]
+    bin = options.rootfs.realpath + 'bin'
+    env = {
+      'PATH' => "#{bin}:#{ENV['PATH']}",
+      'MAKE' => 'make', # Otherwise it uses gnumake which can be different and too old.
+      'CC' => "#{options.target}-gcc",
+      'CXX' => "#{options.target}-g++"
+    }
+    cwd = source_directory.dirname + 'build-glibc'
+    cwd.mkpath
+
+    configure = source_directory.relative_path_from(cwd) +'./configure'
+    system env, configure.to_path, *configure_options, chdir: cwd.to_path, exception: true
+    system env, 'make', '-j', Etc.nprocessors.to_s, chdir: cwd.to_path, exception: true
+    system env, 'make', "install_root=#{options.sysroot.realpath}", 'install', chdir: cwd.to_path, exception: true
+  end
+
+  desc 'Build stage 2 GCC'
+  task :gcc2, [:target] => :environment do |t, args|
+    options = BuildTarget.new args[:target]
+    source_directory = TMP + "tools/gcc-#{GCC_VERSION}"
+    cwd = TMP + 'tools/build-gcc'
+
+    FileUtils.rm_rf cwd
+    cwd.mkpath
+
+    configure_options = options.configuration + [
+      "--prefix=#{options.rootfs.realpath}",
+      "--with-sysroot=#{options.sysroot.realpath}",
+      '--enable-languages=c,c++,lto',
+      '--enable-lto',
+      '--enable-shared',
+      '--disable-bootstrap',
+      '--disable-multilib',
+      '--enable-checking=release',
+      '--disable-libssp',
+      '--disable-libquadmath',
+      '--enable-threads=posix',
+      '--with-default-libstdcxx-abi=new',
+      '--disable-nls',
+      "--target=#{options.target}",
+      "--build=#{options.build}",
+      "--host=#{options.build}"
+    ]
+    flags = '-O2 -fPIC'
+    env = {
+      'CFLAGS' => flags,
+      'CXXFLAGS' => flags,
+      'PATH' => "#{options.rootfs.realpath + 'bin'}:#{ENV['PATH']}"
+    }
+    configure_make_install source_directory, configure_options, env, cwd
+  end
+end
+
+task cross: TMP + 'tools'
+task :cross, :target do |t, args|
+  args.with_defaults(target: 'riscv32-unknown-linux-gnu')
+
+  Rake::Task['cross:binutils'].invoke args[:target]
+  Rake::Task['cross:gcc1'].invoke args[:target]
+  Rake::Task['cross:headers'].invoke args[:target]
+  Rake::Task['cross:kernel'].invoke args[:target]
+  Rake::Task['cross:glibc'].invoke args[:target]
+  Rake::Task['cross:gcc2'].invoke args[:target]
+end
+
+FLAGS = ['-O2', '-g3', '-Wall', '-march=rv32imzicsr', '-mabi=ilp32', '-fno-stack-protector', '-ffreestanding', '-nostdlib', '-static']
+
+CLEAN.include 'kernel.elf', 'build/riscv32'
+
+directory(TMP + 'riscv32')
+
+rule(/^#{TMP}\/[[:alnum:]]+\/[[:alnum:]]+\.o$/ => ->(match) {
+  [Pathname.new(match).basename.sub_ext('.s'), TMP + 'riscv32']
+}) do |t|
+  ENV['CC'] = 'build/rootfs/bin/riscv32-unknown-linux-gnu-gcc'
+
+  system ENV['CC'], *FLAGS, '-c', '-o', t.name, *t.prerequisites.select { |prerequisite| prerequisite.end_with? '.s' }
+end
+
+file 'kernel.elf' => FileList['*.s'].map { |source| (TMP + 'riscv32' + source).sub_ext('.o') } do |t|
+  ENV['CC'] = 'build/rootfs/bin/riscv32-unknown-linux-gnu-gcc'
+
+  system ENV['CC'], *FLAGS, '-T', 'kernel.ld', '-Wl,-Map=kernel.map', '-o', 'kernel.elf', *t.prerequisites
+end
+
+task default: 'kernel.elf'
+task :default do |t|
+  QEMU = 'qemu-system-riscv32'
+
+  system QEMU, '-machine', 'virt', '-bios', 'default', '-nographic', '-serial', 'mon:stdio', '--no-reboot',
+    '-kernel', *t.prerequisites
+end
diff --git a/run.sh b/run.sh
deleted file mode 100755
index 3f33714..0000000
--- a/run.sh
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/bin/sh
-
-set -xue
-
-# QEMU file path
-QEMU=qemu-system-riscv32
-
-# Path to clang and compiler flags
-CC=../riscv32-ilp32d--glibc/bin/riscv32-linux-gcc
-CFLAGS="-O2 -g3 -Wall -march=rv32imzicsr -mabi=ilp32 -fno-stack-protector -ffreestanding -nostdlib -static"
-
-# Build the kernel
-$CC $CFLAGS -T kernel.ld -Wl,-Map=kernel.map -o kernel.elf kernel.s common.s
-
-# Start QEMU
-$QEMU -machine virt -bios default -nographic -serial mon:stdio --no-reboot -kernel kernel.elf