I have updated my patch according to Pedro Alves and Thomas Schwinge's comments this week.

The main part of change is described  in the mail-list, like

• add comment to describe the different between gdb and gdbserver
• adjust Makefile to re-use the exist files instead of using soft link
• generate the patch based on the current upstream master branch
• remove spurious blanks and revert back the '^L' (which I didn't know it has been used as the separate character for GNU Formating)
• use #ifdef GDBSERVER as less as I can.

Now, I am running the testcase for native and gdbserver.