Re: [Kgdb-bugreport] About kgdb some questions

[Josh Z. <jos...@gm...>]

Hello Sergei,
     Thanks for your reply.
I think I was confused with JTAG debugger. I also have some questions about
it.

    void breakpoint(void) {
          ...
wmb();
 BREAKPOINT();
wmb();

    When host gdb running "target remote udp:targetip:6443 ", kgdb will
entry into kgdb_handle_exception(),  my target will be  stopped and  any
program can n't run, I can't press any key in the target. So how the  kgdb
implement it?     I 've seen that
kgdb_handle_exception(){
   ...
  local_irq_save(flags);
     ..
     get_packet()
     ...
 local_irq_restore(flags);
   ..
 }

 Is it mean that I  must leave  local_irq_restore(flags) so that other
programs can be run ?



2008/3/26, Sergei Shtylyov <ssh...@ru...>:
>
> Hello.
>
>
> Josh Zhao wrote:
>
> > Hi  everyone,  I have some questions after reading kgdb patch,
> >    1. Does it have porting guide?
>
>
>     See Documentation/DocBook/kgdb.tmpl (you can make pdf/ps file from
> this),
> I know of no other guide (besides the source itself).
>     There's also more complete user manual at
> http://kgdb.linsyssoft.com/docu.htm...
>
>
> >   2. Kgdb will process the data that host kgdb sent, so where is the
>
>
>     Host *gdb*.
>
> > protocol specification?
>
>     Indeed where? It should be somewhere among the gdb documentation I
> guess...
>
>
> >   3.Why I haven't seen about software breakpint implemention on
> > arch-kgdb(arch/blackfin/kernel),only hw breakpoint ?
>
>
>     I just looked there, and it turned out that we have a funny situation
> with
> Blackfin. The kgdb.c module there seems a full featured backend (even with
> h/w
> breakpoint support) for the new KGDB --- which hasn't been merged to the
> mainline yet. The s/w breakpoints are handled in the generic way by
> kernel/kgdb.c which is a part of the KGDB patchset that can be found on
> http://sourceforge.net/projects/kgdb...
>
>
> >   4. When host gdb connects to kgdb, my target board holds, I can't
> press
> > any key on it. So how to do by kgdb patch?
>
>
>     Load the cross-gdb on host, connect to the target as described in the
> above-mentioned documetation (with gdb's 'target remote' command), and
> when
> this happens, just press 'c' in gdb ('continue' command) -- the target
> should
> resume booting.
>
> >   Thanks!!!
>
> WBR, Sergei
>