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Re: Bug with watchpoints on Linux
- From: Pierre Muller <muller at cerbere dot u-strasbg dot fr>
- To: gdb at sources dot redhat dot com
- Date: Wed, 21 Nov 2001 13:12:50 +0100
- Subject: Re: Bug with watchpoints on Linux
At 13:01 21/11/2001 , vous avez écrit:
> There seems to be a big problem with
>hardware watchpoints under Linux.
>
> If I compile a simple program :
>
>/* START of twatch.c */
>static int x,y;
>int
>main ()
>{
> x = 5;
> y = x * 2;
> x = y / 2;
> x = 7;
> return 0;
>}
>/* END of twatch.c */
>and set a hardware watchpoint on variable 'x',
>the debugger correctly stops at each program location where this global
>var is changed.
>
> But at the second run, the program is never stopped because
>of the changes to this global variable.
>
> It seems like there is a problem with the hardware watchpoint
>resetting.
>
> I tested this on only one Linux machine,
>but both the main and the 5.1 branches show this problem.
>
>
> The current main CVS tree with a patch (not yet submitted)
>to add hardware watchpoints on cygwin target does not
>have this problem (It works but there are still some problems).
Whoops, I was too fast once again...
I do see the same problem in my cygwin implementation ...
>This makes me suspect that the problem is truely Linux specific.
>
> Is this a known Linux problem of version 5.1 ?
Is this a known problem for i386 hardware watches ?
Pierre Muller
Institut Charles Sadron
6,rue Boussingault
F 67083 STRASBOURG CEDEX (France)
mailto:muller@ics.u-strasbg.fr
Phone : (33)-3-88-41-40-07 Fax : (33)-3-88-41-40-99