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