On Wed, May 7, 2008 at 2:41 PM, Avi Nehori <anehori@xxxxxxxxxxxxxx> wrote:
> Thanks for your reply Jay,
> I'm running i386 and the thing is that when i set the breakpoint on a
> memory address(trying to catch a memory
> corruption bug) the watch point is not getting hit when the memory is
> written.
> I'm following the kdb documentation which says :
>
> "The |bph| and |bpha| commands can be used (provided the architecture
> supports use of hardware registers) to apply read and write breakpoints.
> This means we can get control whenever data is read from or written into
> a particular address. This can be extremely handy when debugging
> data/memory corruption problems, where you can use it to identify the
> corrupting code/process."
>
> *Examples*
>
> *To enter the kernel debugger whenever four bytes are written into
> address 0xc0204060:*
> | [0]kdb> bph 0xc0204060 dataw 4
>
>
> so i followed the documentation and set a breakpoint using bph (and
> also bpha) on a memory address
> exactly as the above example ,but when i modify the memory address
> ,the breakpoint does not hit....
> any idea what is wrong here ?
> any help will be very appreciated .
> Thanks!
>
What the kernel version are you using? and how do you modify the memory address?
Regards
Jason Xiao
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> Jay Lan wrote:
> > Avi Nehori wrote:
> >
> >> Hi,
> >> I'm trying to set a watch point with bpha as follows :
> >> bpha address dataw 4
> >> but the watchpoint is never called when the memory address is changed.
> >> is it a know bug ?
> >> is there a patch ?
> >>
> >
> > I heard bph/bpha worked on x86_64. However, hardware breakpoint
> > was not implemented on IA64. Were you on IA64?
> >
> > Greg Banks of SGI (gnb@xxxxxxx) provided patches for IA64. Many
> > thanks to Greg!
> > 1) gnb-kdb-implement-bpha-v3
> > This patch implemented bph/bpha on IA64.
> > 2) gnb-test-kdb-bph
> > This patch provided a test infrastructure to test all the ia64
> > data* breakpoint features.
> >
> > I have uploaded the patches to the download area.
> > ftp://oss.sgi.com/projects/kdb/download/v4.4
> >
> >
> > Cheers,
> > - jay
> >
> >
> >> Thanks.
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> >
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> >
> >
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