Re: RFC: Use the ARM CPSR as a fallback to determine ARM/Thumb

[Mark Kettenis <mark dot kettenis at xs4all dot nl>]

> Date: Thu, 2 Mar 2006 17:14:46 -0500
> From: Daniel Jacobowitz <drow@false.org>
> 
> On Tue, Feb 21, 2006 at 10:36:01AM -0500, Daniel Jacobowitz wrote:
> > What I had in mind for this was:
> > 
> > set arm fallback-mode [arm|thumb|auto]
> > 
> > That is, continue to honor symbol information, but change the fallback
> > when we don't have symbols to arm, thumb, or current cpsr.
> > 
> > And maybe augment that with:
> > 
> > set arm force-mode [arm|thumb|auto]
> > 
> > This would also override symbol information.
> > 
> > This is basically the same as your first option, but spread out over
> > two variables.  How does that sound?
> 
> Something like the attached; look OK?
> 
> For correctness this needs the massive remove_breakpoint patch
> I'm posting next.

Hmm, this really should unwind CPSR from the frame I think.  A bit
impractical to change that now, but something to keep in mind.  Could
you add a FIXME that points this out if you agree?

> 2006-03-02  Daniel Jacobowitz  <dan@codesourcery.com>
> 
> 	* arm-tdep.c (arm_mode_strings, arm_fallback_mode_string)
> 	(arm_force_mode_string, arm_show_fallback_mode)
> 	(arm_show_force_mode): New.
> 	(arm_pc_is_thumb): Honor fallback-mode and force-mode.
> 	Fall back to the CPSR.
> 	(_initialize_arm_tdep): Add "set arm fallback-mode"
> 	and "set arm force-mode".
> 
> 2006-03-02  Daniel Jacobowitz  <dan@codesourcery.com>
> 
> 	* gdb.texinfo (ARM): Document set/show arm fallback-mode
> 	and set/show arm force-mode.
>