[Dwarf-Discuss] Retrieving variables, function address using dwarf

[Archana Deshmukh]

Thanks Michael for the response. Actually, I have only this much
information.

I need to get information related to

 For global variables , I read the address "55b51afea000" from     >
/proc/<pid>/maps file. I use DW_OP_addr parameter to retrieve the address.

 55b51afea000 + DW_OP_addr gives me the address of global variables.

For function, I read the address "55b51afea000" from     > /proc/<pid>/maps
file.. I use DW_AT_low_pc parameter to retrieve the function starting
address

Now, I need to read the local variables address. As I am not executing the
process, I cannot use registers. I need to use DW_OP_call_frame_cfa. I am
not able to understand how to retrieve addresses using
DW_OP_call_frame_cfa.

Any pointer or suggestion are most welcome.

Best Regards,
Archana





On Tue, Mar 9, 2021 at 11:07 PM Michael Eager <eager at eagercon.com> wrote:

> It's difficult to offer advice with such a spare description.
>
> You might read the executable and relocate the .debug_info and
> other debug sections using the process map.  If you have the
> process image, this probably would not be necessary.
>
> On 3/8/21 1:49 AM, Archana Deshmukh via Dwarf-Discuss wrote:
> > Hello,
> >
> > I have a pinatrace.out and process map of a file.
> > With this input, I need to build a symbol table.
> >
> > Best Regards,
> > Archana Deshmukh
> >
> > On Sun, Mar 7, 2021 at 10:29 AM Archana Deshmukh
> > <desharchana19 at gmail.com <mailto:desharchana19 at gmail.com>> wrote:
> >
> >
> >
> >     ---------- Forwarded message ---------
> >     From: *Michael Eager* <eager at eagercon.com <mailto:eager at eagercon.com
> >>
> >     Date: Sat, Mar 6, 2021 at 10:53 PM
> >     Subject: Re: [Dwarf-Discuss] Retrieving variables, function address
> >     using dwarf
> >     To: Archana Deshmukh <desharchana19 at gmail.com
> >     <mailto:desharchana19 at gmail.com>>, <dwarf-discuss at lists.dwarfstd.org
> >     <mailto:dwarf-discuss at lists.dwarfstd.org>>
> >
> >
> >     On 3/5/21 8:28 PM, Archana Deshmukh via Dwarf-Discuss wrote:
> >      > I need to read the address of local variable, global variable,
> >     function
> >      > name and function arguments from the process.
> >      >
> >      > For global variables , I read the address "55b51afea000" from
> >      > /proc/<pid>/maps file. I use DW_OP_addr parameter to retrieve the
> >     address.
> >      > 55b51afea000 + DW_OP_addr gives me the address of global variable.
> >      >
> >      > I need to read the stack segment, heap. Is there any way to read
> >      > segments? DW_AT_segment parameter seems to be for 16 bit.
> >      >
> >      > I need to read the following process map using dwarf.
> >      >
> >      > Any suggestion, pointers are welcome.
> >      >
> >      > 55b51afea000-55b51afeb000 r-xp 00000000 fd:00 5902563
> >
> >     Can you explain what you are trying to do?
> >
> >     Usually a DWARF consumer (a debugger) does not need to read the
> >     process memory map.  All of the information you mention is in
> >     the DWARF data.  You may need to relocate addresses in the DWARF
> >     debug data.
> >
> >     DWARF does not contain information about the process memory
> >     layout, such as the location of the heap or the start of the
> >     stack.
> >
> >     --
> >     Michael Eager
> >
> >
> > _______________________________________________
> > Dwarf-Discuss mailing list
> > Dwarf-Discuss at lists.dwarfstd.org
> > http://lists.dwarfstd.org/listinfo.cgi/dwarf-discuss-dwarfstd.org
> >
>
> --
> Michael Eager
>
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