[Dwarf-Discuss] armcc DWARF

[Michael Eager]

On 05/22/2018 02:33 PM, David Anderson via Dwarf-Discuss wrote:
> 
> I have been given a tiny object file? created by armcc
> using DWARF and things make no sense to me so far.
> 
> dwarfdump (and libdwarf) use the SHT_GROUP section data to associate
> sections to their group.? This is a .o, not a fully linked executable or
> shared-library.
> 
> (libdwarf assigns group numbers itself. group 1 is? non-dwo .debug sections)
> (any .dwo sections present would be shown as group 2
> if not listed in a section-group header, but no such are present here)
> 
> Here is dwarfdump/libdwarf/s reading of the sections and section-group
> sections.
> 
> Section?Groups?data
>  ???Number?of?Elf-like?sections:???35
>  ???Number?of?groups???????????:????5
>  ???Group?to?print?????????????:????3
>  ???Count?of?map?entries???????:???15
>  ???[index]??group?section
>  ???[????0]????1?????4?.debug_frame
>  ???[????1]????1?????5?.debug_info
>  ???[????2]????1?????6?.debug_info
>  ???[????3]????1?????7?.debug_line
>  ???[????4]????1?????8?.debug_line
>  ???[????5]????1?????9?.debug_loc
>  ???[????6]????1????10?.debug_macinfo
>  ???[????7]????1????11?.debug_pubnames
>  ???[????8]????3????13?.debug_info
>  ???[????9]????3????14?.debug_line
>  ???[???10]????4????16?.debug_info
>  ???[???11]????5????18?.debug_info
>  ???[???12]????5????19?.debug_line
>  ???[???13]????5????20?.debug_macinfo
>  ???[???14]????6????22?.debug_abbrev
> 
> There are two .debug_info not in any group (called group 1 by libdwarf).
> There is only one .debug_abbrev and it is in group six.
> 
> How is one to make sense of this?? Which .debug_line (sec 7 or 8)would
> be referred to from section 6 debug_line? How would one know?
> 
> Why is .debug_abbrev in a group by itself?
> 
> I would appreciate any information on how the sections tie together...
> how is a reader supposed to know what goes with what?

Can you post the output of readelf?

-- 
Michael Eager    eager at eagercon.com
1960 Park Blvd., Palo Alto, CA 94306