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RE: Error running remote gdb
On Thu, 2006-08-31 at 17:33 -0700, Bizhan Gholikhamseh (bgholikh) wrote:
>
> > > Sending packet: $m3000ce98,4#c9...Ack Packet received: 9421fff0
> > > Sending packet: $M3000ce98,4:7d821008#b1...Ack Packet received: OK
> > > Sending packet: $m10000560,4#59...Ack Packet received: 48000181
> > > Sending packet: $M10000560,4:7d821008#41...Ack Packet received: OK
> > > Sending packet: $vCont;s:6098;c#67...Ack
> >
> > Finally, gdb restores the breakpoints and tells the target to
> > continue.
> >
> > > Packet received: T0501:7ffffd30;40:10000560;thread:6098;
> >
> > Whereupon we immediately hit the breakpoint at main.
> > This is where we went wrong. This shouldn't have happened.
>
> >Actually, this looks fine. But we're at 0x10000560; why are we
> reinserting the breakpoint _at this address_ and >>then continuing?
> >Normally you leave the breakpoint out to step over it.
>
> I> can't think what could cause that.
>
> >> This is where I have to admit that I don't know the exact semantics
> of
> >> the vCont message. Over to you, Daniel?
>
> >That's a "step only thread 6098, continue all other threads"
> >packet, in other words, it corresponds to a single step other than over
> a breakpoint. If we're stepping over a >
> breakpoint we'd have not had the trailing ;c.
>
>
> Sorry I am a little confused here,
Understandable. ;-)
> so you are implying everything is
> fine, however I am not able to step or next?
Well, no, I think we're converging on
"we don't exactly understand what's going on here".
The last message from gdb to the target, "$vCont;s:6098;c#67",
doesn't seem to make sense. Personally I don't understand the
semantics of vCont well enough to say for sure.
Fortunately, vCont can be turned off. ;-)
Can you repeat the experiment approximately like this?
% gdb test
(gdb) set debug remote 1
(gdb) set remote verbose-resume off
(gdb) target remote 172.28.176.142:2001
(gdb) break main
(gdb) continue
(gdb) where
(gdb) step
Send us the result just like before.
Michael