better debug fo the booting parts

lib/elf/object_writer.rb

@@ -30,6 +30,10 @@ module Elf
             end
         end
       end
+      space.main.blocks.each do |b|
+        add_symbol "main@#{b.name}" , b.position
+      end
+      add_symbol "#register@#{space.init.name}" , space.init.position
       assembler.objects.values.each do |slot|
         label = "#{slot.class.name}::#{slot.position.to_s(16)}"
         label += "=#{slot}" if slot.is_a?(Symbol) or slot.is_a?(String)