#!/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'

FileUtils.rm_rf TMP
FileUtils.mkdir_p TMP

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

def stage(source_elna, stage_name, output)
  boot_exe = (TMP + stage_name).to_path
  stage_path = TMP + "#{stage_name}.s"

  system CROSS_GCC, '-nostdlib', '-o', boot_exe, stage_path.to_path, exception: true

  Open3.popen2 'qemu-riscv32', '-L', SYSROOT, boot_exe do |qemu_in, qemu_out|
    qemu_in.write source_elna
    qemu_in.close

    IO.copy_stream qemu_out, output
    qemu_out.close
  end
end

source_elna = File.read 'source.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)