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!
||
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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 ([EMAIL PROTECTED]) 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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