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DragonFly kernel List (threaded) for 2005-01
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Re: debugging kernel threads

To: dillon@xxxxxxxxxxxxxxxxxxxx
From: Richard Nyberg <rnyberg@xxxxxxxx>
Date: Fri, 28 Jan 2005 10:58:42 +0100

At Wed, 26 Jan 2005 20:01:26 +0100,
Richard Nyberg wrote:
> At Wed, 26 Jan 2005 10:04:41 -0800 (PST),
> Matthew Dillon wrote:
> >     Theoretically you can give the 'proc' command a thread address (not a
> >     proc address, a thread address) and it should switch to it.
> > 
> >     But Joerg's recent upgrades of gdb seem to have broken some things
> >     that had been working before.
> > 
> >     Pure kernel threads do not have PCBs in the conventional sense.  The
> >     thread state is pushed onto the stack for the switch/restore instead.
> >     Most of the pcb structure will be unused for a kernel thread.
> > 
> Well, from looking at the code, it seems to me that gdb tries to use
> the pcb in both cases (threads or processes). I'd be very grateful
> if this could be fixed. :)
I tried to hack the new gdb to support kernel threads but I gave up
after a while. I just don't understand the old gdb code :P

The good thing though, is that the old gdb still is buildable,
so I'm using that one for now.

For those who want to use it, just "cd /usr/src/gnu/usr.bin/binutils && make".


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