[Dwarf-Discuss] armcc DWARF

[David Anderson]

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?

Thanks for any hints.
David Anderson

-- 
Duct tape is like the force. It has a light side, a dark side, and it holds the universe together.... -- Carl Zwanzig