#!/usr/bin/env ruby

require 'open3'
require 'fileutils'
require 'pathname'

TMP = Pathname.new 'build'
CROSS_GCC = '../riscv32-ilp32d--glibc/bin/riscv32-linux-gcc'
SYSROOT = '../riscv32-ilp32d--glibc/riscv32-buildroot-linux-gnu/sysroot'

COMMON_BOOT_OBJECT = TMP + 'common-boot.o'

FileUtils.rm_rf TMP
FileUtils.mkdir_p TMP

FileUtils.cp 'boot/asm-boot.s', TMP

def stage(source_elna, stage_name, output)
  boot_exe = (TMP + stage_name).to_path
  stage_path = TMP + "#{stage_name}.s"
  arguments = [CROSS_GCC, '-nostdlib', '-o', boot_exe, stage_path.to_path, COMMON_BOOT_OBJECT.to_path]

  puts(arguments * ' ')
  system *arguments, exception: true

  arguments = ['qemu-riscv32', '-L', SYSROOT, boot_exe]

  puts(arguments * ' ')
  puts
  Open3.popen2(*arguments) do |qemu_in, qemu_out|
    qemu_in.write source_elna
    qemu_in.close

    IO.copy_stream qemu_out, output
    qemu_out.close
  end
end

system CROSS_GCC, '-nostdlib', '-c', '-o', COMMON_BOOT_OBJECT.to_path, 'boot/common-boot.s', exception: true
source_elna = File.read 'boot/goto-boot.elna'

next_stage = TMP + 'goto-boot.s'
File.open next_stage, 'w' do |output|
  stage source_elna, 'asm-boot', output
end
stage(source_elna, 'goto-boot', $stdout)