Re: How to access an applications ELF program header and ELFsection header at runtime

[Bharath Ramesh <bramesh at vt dot edu>]

On Wed, Aug 19, 2009 at 11:14:31AM -0500, Eduardo wrote:
> Hi Bharath,
> 
> I think it's ok to use the symbols __start_data, __start_bss, etc (or
> even dlopen the code itself) in a research project. If I were you,
> though, I would create a level of abstraction in order to guarantee
> that in the future I could change easily the way I get this
> information.

I am trying to play around with the symbols __data_start and __bss_start
to access the location of the .data and .bss section. Is there any way I
need to typecast these symbols so that I can get the information from
these symbols.

Regards,

Bharath

> 
> Best regards,
> Eduardo
> 
> On Wed, Aug 19, 2009 at 10:58 AM, Bharath Ramesh<bramesh@vt.edu> wrote:
> >> -----Original Message-----
> >> From: patofiero@gmail.com [mailto:patofiero@gmail.com] On Behalf Of
> >> Carlos O'Donell
> >> Sent: Wednesday, August 19, 2009 11:50 AM
> >> To: Bharath Ramesh
> >> Cc: Eduardo; libc-help@sourceware.org
> >> Subject: Re: How to access an applications ELF program header and ELF
> >> section header at runtime
> >>
> >> On Wed, Aug 19, 2009 at 9:38 AM, Bharath Ramesh<bramesh@vt.edu> wrote:
> >> > Given this premise that these symbols are part of the linker script
> >> and the
> >> > fact that the existence of .data and .bss section is not guaranteed,
> >> is
> >> > there a consistent way of locating the region/section where all the
> >> global
> >> > data of an application is stored in the applications address space
> >> and the
> >> > length of this region/section.
> >>
> >> There is no consistent way of locating the region/section where all
> >> the global data of an application is stored.
> >>
> >> You can dlopen yourself and lookup a single symbol.
> >>
> >> What problem are you actually trying to solve?
> >
> > In my research project I am trying to provide shared memory semantics over
> > distributed memory. This requires that the global data of the application be
> > consistent across all physical nodes of the cluster. I can make this
> > consistent but I need to know where the application's global data is stored
> > and the size of this region/section so that I can keep it consistent during
> > the execution of the application on the cluster.
> >
> > Regards,
> >
> > Bharath
> >

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