Re: [PATCH 1/5] Support multiple breakpoint types per target in GDBServer.

[Antoine Tremblay <antoine dot tremblay at ericsson dot com>]

On 09/23/2015 10:46 AM, Yao Qi wrote:
> Antoine Tremblay <antoine.tremblay@ericsson.com> writes:
>
> > > PC can't be NULL after your patch #2.  You can remove the second
> > > sentence in this patch or patch #2.
> > I think you mean after patch #3 ?
> >
> > But it can still be NULL see in #3 :
> >
> > /* Default if no pc is set to arm breakpoint.  */
> > +  if (pcptr == NULL)
> > +    {
> > +      *lenptr = arm_breakpoint_len;
> > +      return (unsigned char *) &arm_breakpoint;
> > +    }
>
> I meant this change below in patch #2,
>
> diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
> index bb08761..06387a0 100644
> --- a/gdb/gdbserver/linux-low.c
> +++ b/gdb/gdbserver/linux-low.c
> @@ -7069,16 +7069,10 @@ void
>   initialize_low (void)
>   {
>     struct sigaction sigchld_action;
> -  int breakpoint_len = 0;
> -  const unsigned char *breakpoint = NULL;
>
>     memset (&sigchld_action, 0, sizeof (sigchld_action));
>     set_target_ops (&linux_target_ops);
>
> -  breakpoint = the_target->breakpoint_from_pc (NULL, &breakpoint_len);
> -
> -  set_breakpoint_data (breakpoint,
> -		       breakpoint_len);
>     linux_init_signals ();
>     linux_ptrace_init_warnings ();
>
> We only pass NULL to breakpoint_from_pc here, and we remove it from
> patch #2.  That is why I suggest that PCPTR can't be NULL.

Ok I see, indeed it is never called again with NULL, good point I'll 
remove that and also remove the default NULL handling in the arm 
implementation.


> [I am still reviewing this patch series.  I get something I can't
> explain after I enable thread event breakpoint in order to exercise
> your patches.  I'll send out my comments once I understand the them
> fully.]

Ok thank you, note I'm on IRC as hexa if you ever need some quick answer.