Re: gud : Phase error in gdb-pre-prompt (got pre-emacs)

[Francis Moreau]

Hello

[ sorry for the delayed reply ]

On Wed, Jul 2, 2008 at 12:41 AM, Nick Roberts <nickrob@snap.net.nz> wrote:
>  > > It normally starts (ends) like this:
>  > >
>  > >  ...
>  > >  (recv . "\n^Z^Zpre-prompt\n(gdb) \n^Z^Zprompt\n")
>  > >  (recv . "\n^Z^Zpost-prompt\n")
>  > >  (send-item "set width 0\n" ignore)
>  > >  (recv . "\n^Z^Zpre-prompt\n(gdb) \n^Z^Zprompt\n")
>  > >  (recv . "\n^Z^Zpost-prompt\n")
>  > >  (send-item "set height 0\n" ignore)
>  > >  (recv . "\n^Z^Zpre-prompt\n(gdb) \n^Z^Zprompt\n")
>  > >  (recv . "\n^Z^Zpost-prompt\n&\"\\n^Z^Zerror-begin\\n\"\n&\"No 
> registers.\\n\"\n~\"\\n\"\n~\"^Z^Zerror\\n\"\n^error,msg=\"No 
> registers.\"\n(gdb) \n")
>  > >  (send-item "server interpreter mi -stack-info-frame\n" gdb-get-version))
>  > >
>  > > I understand why Emacs stops sending GDB commands after -stack-info-frame
>
> Sorry, I mean I don't understand
>         ^^^^^
>

any debug mode we could use ?

>  > ...
>  > gdb-input-queue is a variable defined in `gdb-ui.el'.
>  > Its value is
>  > (("server info source\n" gdb-source-info)
>  >  ("server list\n" ignore)
>  >  ("server interpreter mi \"-file-list-exec-source-files\"\n"
>  > gdb-set-gud-minor-mode-existing-buffers-1)
>  >  ("server interpreter mi -data-list-register-names\n" 
> gdb-get-register-names)
>  >  ("set width 0\n" ignore)
>  >  ("set height 0\n" ignore))
>
> This should be nil.
>
>
>  > > Isn't the kernel debugged through a remote stub in a patched gdb (kgdb)?
>  >
>  > Yes probably, I'm using a gdb patched by a third party but don't know and
>  > can't figure out what has been patched...
>
> Then the patch may change behaviour in other ways.  I suspect that it's not
> issuing some of the prompt annotations.  A distributed patched gdb is covered
> by GPL so presumably you have access to the source code.  What version of
> gdb is itbased on? and who are the third party?
>

GNU gdb STMicroelectronics/Linux Base 6.5-24 [build Oct 24 2007]

coming from

http://www.stlinux.com/download/

>
>  > But I can add 2 more info about this issue:
>  >
>  > First, starting gdb from a shell works fine.
>
> I still don't know how you are using gdb.  Presumably it's not running on the
> same machine as the kernel that you are debugging.  How do you start
> gdb/connect to the kernel from a shell?
>

Sorry, gdb is connecting to a probe. I suppose gdb has been patched to do
that.

I can show you what gdb prompt in a shell if you want.

>
>  > Second point is emacs 21 used to work.
>
> It's a different mode.  With M-x gdb, if you use "gdb --fullname" instead of
> "gdb --annotate=3" with Emacs 22.x it should work as before.  With Emacs 23,
> i.e. Emacs in CVS, you have to use M-x gud-gdb

hmm:

sh4-linux-gdb: unrecognized option '--fullname'

thanks
-- 
Francis