Hello everyone,,

I got an interesting comment from suse guys ,,,

"One easy way to do backtracing in a portable way over multiple
Linux architectures is to use glibc's backtrace() function. "

http://www.gnu.org/software/libtool/manual/libc/Backtraces.html

does it makes sense for us ,, can we use this and questions comes .. how ...???

i know i am asking too many questions and many of them could be dumb
but please bear with me ...

Thanks
Sagar

On 11/17/08, Sagar <sagarseth@...> wrote:
> Hello Friend ,,
>
> I am confused ... from what i see inside the code i need to re-write
>
> 1. struct frameinfo and stackinfo ( for 64bit)
> 2. then need to write the getaddr unwind getframe and all other
> functions in stack.c
>
> right ???
>
> please help with some documentation.. better will be an example ..
>
> here is something useful that i found over the weekend ,... please
> have look ,, let me know about further steps...
>
>
> thanks in advance...
> Seth
>
>
>
>
> From: Graeme Roy <graeme_roy@...>
> Date: Fri, 14 Nov 2008 22:09:22 -0000
> Subject: RE: [mpatrol] mpatrol 64 bit issue ....
> To: Sagar <sagarseth@...>
>
> Hi,
>
>
>
> If you've got the time to have a look, the code for all the stack tracebacks
> is in mpatrol/src/stack.c. Just look for the x86-specific code - there's
> not much because for 32-bit x86 it's really easy, you just follow the chain
> of frame pointers. Daniel from CodeSourcery replied to the mpatrol group as
> well, suggesting that it's a lot more complicated for 64-bit x86 since you
> have to look at the .eh_frame section in the executable file and any shared
> libraries.
>
>
>
> What you could do is try defining MP_BUILTINSTACK_SUPPORT when you build the
> mpatrol library. This will make gcc plant some code to help traverse the
> stack instead of using mpatrol's code. Unfortunately it will only work for
> a finite size stack (see the comments in mpatrol/src/config.h) but it'll get
> you up and running, I hope. It doesn't always work on all platforms but
> it's worth you giving it a try.
>
>
>
> Good luck,
>
>
>
> Graeme.
>
>
>
> _____
>
> From: Sagar [mailto:sagarseth@...]
> Sent: 14 November 2008 12:51
> To: graeme_roy@...
> Subject: Re: [mpatrol] mpatrol 64 bit issue ....
>
>
>
> Hi Friend,
>
> Can u show me where is the
> "source code for getting stack tracebacks in 32 bit"
>
> I can try to put effort for developing the source for 64 bit..
>
> may be i can help u in developing 64 bit version.....
>
> i got a free weekend ...
>
> Sagar
>
> On 11/14/08, Graeme Roy <graeme_roy@...> wrote:
>> Hi,
>>
>> Yes, it sounds like there's been no support added for stack tracebacks on
>> 64-bit x86. The 32-bit x86 code will not work, as you have found out and
> I
>> haven't written support for 64-bit x86 as I don't have access to it.
>>
>> If anyone has written the extra source code for getting stack tracebacks
> to
>> work for mpatrol on that architecture could they post it here? It should
>> only be a few lines of diffs anyway, compared to what I'd expect support
> for
>> Itanium to be.
>>
>> Thanks,
>>
>> Graeme.
>>
>> _____
>>
>> From: mpatrol@yahoogroups.com [mailto:mpatrol@yahoogroups.com] On Behalf
> Of
>> Sagar
>> Sent: 11 November 2008 11:11
>> To: mpatrol@yahoogroups.com
>> Subject: [mpatrol] mpatrol 64 bit issue ....
>>
>>
>>
>> Hello Graeme,
>>
>> Thanks for the update ,, we took the target.h file and places where
>> the ARCH and ENVIRON variables were defined .. we did a undef and
>> redefined them to ARCH_IX86 and ENVIRON_64.
>>
>> CPUs in the box are AMD opteron 275.
>>
>> Now we are getting a core for mpatrol .
>>
>> When we did the analysis on the core then I am getting
>> #0 0x0000002a9567cab4 in __mp_getframe () from /src/lib64/libmpatrol.so
>>
>> What could be wrong .
>>
>> .....-----------------
>>
>> Glad to hear it's working OK for you, at least on one of your machines.
>>
>> For SuSE Enterprise 64-bit, I assume that it's running on Intel Core 2 Duo
>
>> and is therefore x86-64 (and not Itanium). mpatrol has been ported to
>> 64-bit architectures before (MIPS and SPARC for example) but I don't know
> if
>> anything's been done by anyone to port it to 64-bit x86 (i.e. running in a
>
>> 64-bit environment and not just under a 32-bit OS). For example, the stack
>
>> reading code will most likely be different which is probably why you're
> not
>> getting any location information for the allocations.
>>
>> Has anyone here run mpatrol on a 64-bit x86 architecture and got stack
>> tracebacks to work? I imagine there won't be too many changes to make
> (just
>> ensure that ARCH = ARCH_IX86 and ENVIRON = ENVIRON_64 when building
> mpatrol)
>> - just look for ENVIRON_64 in the mpatrol source code to see where I did
> the
>> changes for MIPS and SPARC. I don't have access to a 64-bit OS at the
>> moment so I can't really help much.
>>
>>
>>
>>
>
>
>
> --
> Thanks and Regards
> Sagar
>
>
>
>
> --
> Thanks and Regards
> Sagar
>


--
Thanks and Regards
Sagar