Re: Powerpc and software single step

[Daniel Jacobowitz <drow@mvista.com>]

On Tue, Aug 19, 2003 at 10:30:20PM -0400, Andrew Cagney wrote:
> 
> >Could we do this slightly differently?  SOFTWARE_SINGLE_STEP_P is used
> >in two non-platform-specific files: infptrace.c for a sanity check, and
> >infrun.c.  In infrun, the only line which matters for this case is in
> >resume:
> >    if (SOFTWARE_SINGLE_STEP_P () && step)
> >
> >Why not add a hook to check there which lets the user use software
> >single step?  It'll require playing with the target macros; we'd need
> >something like:
> >  SOFTWARE_SINGLE_STEP - perform software single step
> >  SOFTWARE_SINGLE_STEP_P - SOFTWARE_SINGLE_STEP available
> >  SOFTWARE_SINGLE_STEP_ONLY_P - no hardware singlestep available
> >    (check that in infptrace instead of SOFTWARE_SINGLE_STEP_P?)
> >
> >I've wanted to flip back and forth at runtime before.
> 
> See:  Cleanup software single step.
> http://sources.redhat.com/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gdb&pr=120
> (but don't take the suggested solution literally).
> 
> I think kevin was playing with it (?) - search the mail archives.  This 
> needs to be fixed - I don't think a workaround is acceptable.

I _think_ that's a different problem...

In any case it's definitely a real problem.  See the post I made a few
days ago about a thread debugging problem which causes single steps to
turn into continues.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer