How can I implement new breakpoint commands

Nagmat Nazar via Gdb <[email protected]>
Newsgroups gmane.comp.gdb.devel
Message-ID <CAJnvuZ8rxhkuJOapKe0SifSfE+gQGGp1VG2+EKWVncH5s9nZUg@mail.gmail.com> 
I would like to add 3 more commands to GDB,  *set, unset, list PCB *commands
and would like to break if I have the same value with the *program context
register(special register implemented by me). *How can I implement these
commands? Where can I start from?

Kind regards,
Nagmat
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