Re: [RFC] Wrong register numbers in .dwarf_frame on Linux/PowerPC

[David Edelsohn <dje.gcc@gmail.com>]

On Mon, Nov 26, 2012 at 2:10 PM, Ulrich Weigand <uweigand@de.ibm.com> wrote:

> So I'm wondering where to go from here.  I guess we could:
>
> 1. Bring GCC (and gas) behaviour in compliance with the documented ABI
>    by removing the #undef DBX_REGISTER_NUMBER and changing gas's
>    md_reg_eh_frame_to_debug_frame to the original implementation from
>    Jakub's patch.  That would make GDB work well on new files, but
>    there are a large number of binaries out there where we continue
>    to have the same behaviour as today ...
>
> 2. Leave GCC and gas as-is and modify GDB to expect GCC numbering in
>    .dwarf_frame, except for the condition code register.  This would
>    break debugging of files built with GCC 4.0 and 4.1 unless we
>    want to add a special hack for that.
>
> 3. Like 2., but remove the condition code hack: simply use identical
>    numbers in .eh_frame and .dwarf_frame.  This would make PowerPC
>    like other Linux platforms in that respect.
>
> Thoughts?

I vote for (3).

Thanks, David