gdbserver i386_linux hardware watchpoints in a multi threaded application

gdbserver i386_linux hardware watchpoints in a multi threaded application

[Claus Baumgartner]

Hi,

I implemented the hardware watchpoints for the i386 linux target in the 
  gdbserver and it works fine in the same thread where the watchpoint 
has been assigned. I would like to use gdb and gdb server to debug 
memory locations overwritten by other threads and this is where gdb fails.

Is there any work in progress regarding this?

Where should I start if I want to make it work?

Thanks,

Claus

Re: gdbserver i386_linux hardware watchpoints in a multi threaded application

[Luis Machado]

On Wed, 2007-08-15 at 21:38 +0300, Claus Baumgartner wrote:
> Hi,
> 
> I implemented the hardware watchpoints for the i386 linux target in the 
>   gdbserver and it works fine in the same thread where the watchpoint 
> has been assigned. I would like to use gdb and gdb server to debug 
> memory locations overwritten by other threads and this is where gdb fails.
> 
> Is there any work in progress regarding this?

Yes, there is. The patch Jeff Johnston wrote some time ago should
address this on GDB. I'm currently taking over his work and adding
support for ppc.

You can check the most up-to-date patch on these messages:

http://sourceware.org/ml/gdb-patches/2007-08/msg00253.html
http://sourceware.org/ml/gdb-patches/2007-08/msg00254.html


The original post by Jeff Johnston here:
http://sourceware.org/ml/gdb-patches/2004-06/msg00278.html

Best regards,

-- 
Luis Machado
Software Engineer 
IBM Linux Technology Center
e-mail: luisgpm@linux.vnet.ibm.com

Re: gdbserver i386_linux hardware watchpoints in a multi threaded application

[Daniel Jacobowitz]

On Wed, Aug 15, 2007 at 04:12:29PM -0300, Luis Machado wrote:
> On Wed, 2007-08-15 at 21:38 +0300, Claus Baumgartner wrote:
> > Hi,
> > 
> > I implemented the hardware watchpoints for the i386 linux target in the 
> >   gdbserver and it works fine in the same thread where the watchpoint 
> > has been assigned. I would like to use gdb and gdb server to debug 
> > memory locations overwritten by other threads and this is where gdb fails.
> > 
> > Is there any work in progress regarding this?
> 
> Yes, there is. The patch Jeff Johnston wrote some time ago should
> address this on GDB. I'm currently taking over his work and adding
> support for ppc.

I think that Jeff's patches only affect gdb native debugging, and
gdbserver would need an independent fix.  But the same solution should
work there, too.

Claus, do you have a copyright assignment?  Are you interested in
contributing the i386 watchpoint support for gdbserver?

-- 
Daniel Jacobowitz
CodeSourcery

Re: gdbserver i386_linux hardware watchpoints in a multi threaded application

[Claus Baumgartner]

Daniel Jacobowitz wrote:
> On Wed, Aug 15, 2007 at 04:12:29PM -0300, Luis Machado wrote:
>> On Wed, 2007-08-15 at 21:38 +0300, Claus Baumgartner wrote:
>>> Hi,
>>>
>>> I implemented the hardware watchpoints for the i386 linux target in the 
>>>   gdbserver and it works fine in the same thread where the watchpoint 
>>> has been assigned. I would like to use gdb and gdb server to debug 
>>> memory locations overwritten by other threads and this is where gdb fails.
>>>
>>> Is there any work in progress regarding this?
>> Yes, there is. The patch Jeff Johnston wrote some time ago should
>> address this on GDB. I'm currently taking over his work and adding
>> support for ppc.
> 
> I think that Jeff's patches only affect gdb native debugging, and
> gdbserver would need an independent fix.  But the same solution should
> work there, too.
> 
> Claus, do you have a copyright assignment?  Are you interested in
> contributing the i386 watchpoint support for gdbserver?
> 

I'm overloaded for the moment and the i386 watchpoint support is quite 
messy. I will send a patch when I get the time to clean it up.

Have a nice day,

Claus