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Re: [RFD] How to fix FRAME_CHAIN_VALID redefinition in config/i386/tm-i386v4.h ?
- From: Daniel Jacobowitz <drow at mvista dot com>
- To: Andrew Cagney <ac131313 at cygnus dot com>
- Cc: "Peter.Schauer" <Peter dot Schauer at regent dot e-technik dot tu-muenchen dot de>,gdb-patches at sources dot redhat dot com
- Date: Sun, 17 Feb 2002 11:33:49 -0500
- Subject: Re: [RFD] How to fix FRAME_CHAIN_VALID redefinition in config/i386/tm-i386v4.h ?
- References: <200202171345.OAA04571@reisser.regent.e-technik.tu-muenchen.de> <3C6FD90E.email@example.com>
On Sun, Feb 17, 2002 at 11:23:42AM -0500, Andrew Cagney wrote:
> #ifndef FRAME_CHAIN_VALID
> #define FRAME_CHAIN_VALID(chain, thisframe) file_frame_chain_valid
> (chain, thisframe)
> and that, in turn, can be moved to gdbarch.* allowing the level-1
> requirement to be dropped. Doesn't fix the underlying problem though :-(
Or we could fix this particular problem by making FRAME_CHAIN_VALID
into a multi-arch method (just in case, and for hppa (?) which seemed
to have a useful redefinition, though I don't see why it was needed),
defaulting it to func_frame_chain_valid for all targets. No one ever
gave me a reason not to do this when I asked.
> - allow multiple registrarations for an architecture (eg i386-tdep.c,
> i386-linux-tdep.c, ...) and have gdbarch try the OS specific one before
> the generic one.
> - Let a tdep file specify the ``os'' when registering their architecture
> so that the gdbarch code can select based on that.
> - Add an ``os'' field to ``struct gdbarch_info'' which can be set to
> what is known to be the OS.
> - Just tweek i386-tdep.c's *gdbarch_init() so that it uses a better
> local (architecture specific) heuristic.
> I suspect a combination of the first three is the best. The moment the
> heuristic is pushed down to the target we end up with inconsistent,
> target dependant, behavour.
There's some interesting code along these lines in what Richard
committed for ARM. He parses things like glibc's .note.ABI-tag
section, as well as ELF_OSABI fields where set.
Daniel Jacobowitz Carnegie Mellon University
MontaVista Software Debian GNU/Linux Developer