[RFA] fix dwarf2 unwind of pc

[Mark Kettenis]

Richard Henderson <rth@redhat.com> writes:

> On Sat, May 31, 2003 at 10:48:01PM -0400, Andrew Cagney wrote:
> > The loss of control is likely from a dud return address (used for 
> > setting the return breakpoint) being computed when the the code is first 
> > stepped into dummy().
> 
> Indeed, a problem with the new dwarf2 unwinder.  Neither of the
> targets Mark tested have the return address in a register.  Ok?
> 
> r~
> 
> 	* dwarf2-frame.c (dwarf2_frame_cache): Handle retaddr_column
> 	not overlapping PC_REGNUM.

Ah, GCC is trying to be economical here.  From reading the DWARF
standard I would have expected the compiler to have emitted CFA
instructions that actually put something in the return address column.
Anyway, this shouldn't hurt.

Approved.

Mark