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Date: Thu, 17 Mar 2005 19:52:00 -0000
From: Joel Brobecker <brobecker@adacore.com>
To: Michael Snyder <msnyder@redhat.com>
Cc: gdb-patches@sources.redhat.com
Subject: Re: dumb question; mips multi-abi
Message-ID: <20050317195206.GV1156@adacore.com>
References: <4239DD2B.8070306@redhat.com>
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> I confess I have not been following the development of ABI support
> very closely.  I have a user who wants to debug an application that
> uses a mix of (essentially) o32 and o64 code.  I think he has some
> sort of calling translation layer between the two.
> 
> Is that at all possible?  Can gdb switch back and forth on the fly,
> while debugging a single app?  Maybe manually?  Maybe without expecting
> to be able to bridge the backtrace?

Hmmm, I am a bit pessimistic about this, unfortunately. I can't tell
you for sure, because I don't know this area of mips-tdep very much,
but my recent reading of this file seems to indicate that the ABI
is set in the gdbarch tdep structure when the executable is loaded.

I also noticed recently that you could force the ABI using:

      add_setshow_enum_cmd ("abi", class_obscure, mips_abi_strings,
                            &mips_abi_string, _("\
    Set the MIPS ABI used by this program."), _("\
    Show the MIPS ABI used by this program."), _("\
    This option can be set to one of:\n\
      auto  - the default ABI associated with the current binary\n\
      o32\n\
      o64\n\
      n32\n\
      n64\n\
      eabi32\n\
      eabi64"),
                            mips_abi_update,
                            show_mips_abi,
                        &setmipscmdlist, &showmipscmdlist);

But then again, this setting is only used when initializing the
gdbarch structure...

It looks like you'll have to choose on ABI between the two... :-/

-- 
Joel