From: Daniel Jacobowitz <drow@mvista.com>
To: Andrew Cagney <ac131313@ges.redhat.com>, gdb@sources.redhat.com
Subject: Re: RFC: Two small remote protocol extensions
Date: Wed, 25 Sep 2002 08:51:00 -0000 [thread overview]
Message-ID: <20020925155206.GA17491@nevyn.them.org> (raw)
In-Reply-To: <20020828133445.GA16642@nevyn.them.org>
On Wed, Aug 28, 2002 at 09:34:45AM -0400, Daniel Jacobowitz wrote:
> On Wed, Aug 28, 2002 at 12:06:38AM -0400, Andrew Cagney wrote:
> > What is the absolute minimum needed?
> >
> > - step off breakpoint / thread-hop
> > = using a sched lock single-step
> > = using software single-step breakpoints and a sched lock continue
> > (Note: this is where the existing interface really falls down -- step=0
> > so remote.c won't know to schedule-lock)
> >
> > - continue
> >
> > I think, after that, everything is an efficiency gain. Looking at the list:
> >
> > > step one, stop others
> >
> > Hardware single-step off of breakpoint.
> > TPID, STEP, !OTH
> > HcTID, s
> >
> > > step one, continue others
> >
> > Hardware single-step.
> > TPID, STEP, OTH
> > H???, s
> >
> > > continue one, stop others
> >
> > Schedule lock.
> > Software single-step off breakpoint.
> > TPID, !STEP, !OTH (wiered)
> > HcTID, c
> >
> > > continue one, continue others
> >
> > Software single-step.
> > General resume.
> > TPID, !STEP, OTH
> > Hc0, c
> >
> > > Something like:
> > > resume (ptid, step, run_others, target_signal)
> > > maybe? Does anyone think step_all is useful (I don't)?
> >
> > It is what a simulator might implement.
> >
> > So looking at the remote protocol. There in't a way of specifying TPID,
> > STEP, OTH (your bug).
>
> OK, I suppose that makes sense. It's pretty much where I was to begin
> with: if Hc is non-zero, lock to that thread; if Hc is 0, resume all
> threads, but where do we step? How would you like to see us specify
> this - I used Hs, a new step packet taking a thread argument might work
> too... etc.
>
> There's also the question of whether any other simulators or targets
> handle this, and how they behave; I'm not familiar with them. Do they
> treat "HcTID, s" as single-step-one-thread-only? I guess they probably
> do.
Andrew,
I was reminded today that this bug is still present, and we haven't
come up with a solution for it. Do you have any ideas?
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer
next prev parent reply other threads:[~2002-09-25 15:51 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-01 19:25 Daniel Jacobowitz
2002-05-02 8:38 ` Andrew Cagney
2002-05-02 8:52 ` Daniel Jacobowitz
2002-05-02 9:39 ` Andrew Cagney
2002-05-02 12:14 ` Daniel Jacobowitz
2002-05-02 12:22 ` Kevin Buettner
2002-05-02 12:34 ` Daniel Jacobowitz
2002-05-02 13:13 ` Andrew Cagney
2002-05-02 14:09 ` Daniel Jacobowitz
2002-05-03 11:24 ` Andrew Cagney
2002-05-03 14:28 ` Daniel Jacobowitz
2002-05-03 15:18 ` Andrew Cagney
2002-05-03 15:22 ` Daniel Jacobowitz
2002-05-04 19:59 ` Andrew Cagney
2002-05-02 13:13 ` Quality Quorum
2002-05-02 14:13 ` Daniel Jacobowitz
2002-05-03 13:07 ` Andrew Cagney
2002-08-16 7:30 ` Daniel Jacobowitz
2002-08-16 7:42 ` Andrew Cagney
2002-08-16 7:52 ` Daniel Jacobowitz
2002-08-16 8:21 ` Andrew Cagney
2002-08-22 19:23 ` Andrew Cagney
2002-08-22 19:36 ` Daniel Jacobowitz
2002-08-23 7:24 ` Quality Quorum
2002-08-23 7:26 ` Daniel Jacobowitz
2002-08-23 7:49 ` Quality Quorum
2002-08-23 8:57 ` Andrew Cagney
2002-08-23 11:16 ` Quality Quorum
2002-08-23 12:39 ` Andrew Cagney
2002-08-23 13:10 ` Quality Quorum
2002-08-27 20:23 ` Andrew Cagney
2002-08-28 8:31 ` Quality Quorum
2002-08-28 9:44 ` Andrew Cagney
2002-08-28 9:49 ` Daniel Jacobowitz
2002-08-22 21:08 ` Andrew Cagney
2002-08-23 5:44 ` Daniel Jacobowitz
2002-08-23 12:10 ` Andrew Cagney
2002-08-23 12:53 ` Andrew Cagney
2002-08-23 13:15 ` Daniel Jacobowitz
2002-08-27 21:07 ` Andrew Cagney
2002-08-28 6:33 ` Daniel Jacobowitz
2002-09-25 8:51 ` Daniel Jacobowitz [this message]
2002-09-25 11:17 ` Andrew Cagney
2002-09-26 18:39 ` Andrew Cagney
2002-09-26 18:48 ` Andrew Cagney
2003-06-29 7:51 ` Daniel Jacobowitz
2003-09-03 23:41 ` Andrew Cagney
2003-09-17 15:51 ` Daniel Jacobowitz
2003-09-17 16:19 ` Andrew Cagney
2003-09-17 16:23 ` Daniel Jacobowitz
2003-09-22 0:27 ` Andrew Cagney
2003-09-22 1:01 ` Daniel Jacobowitz
2003-09-22 3:02 ` Andrew Cagney
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