Re: Register numbers on hppa64

[Mark Kettenis <mark.kettenis@xs4all.nl>]

> Date: Sat, 26 Nov 2005 12:52:25 -0500 (EST)
> From: "John David Anglin" <dave@hiauly1.hia.nrc.ca>
>
> > But we have a de-facto ABI since GCC has been using
> > DBX_REGISTER_NUMBER for all non-CFI DWARF2 output.  I never noticed
> > DWARF2_FRAME_REG_OUT before, but it seems to implement a suggestion I
> > made in the ppc64 discussion.  Now that it's there I really think you
> > should consider using it for hppa/hppa64 too.  Something like
> > 
> > #define DWARF2_FRAME_REG_OUT(REGNO, FOR_EH) \
> >   ((FOR_EH) ? (REGNO) : DBX_REGISTER_NUMBER (REGNO)
> > 
> > if pa32-reg.h and pa64-reg.h should be enough.
> > 
> > Meanwhile, I should get busy and implement the necessary support in
> > gdb to cope with the fact that .debug_frame has a different encoding
> > than .eh_frame.
> 
> Let me understand, are you saying that .debug_frame has a mix
> of gcc and dbx register numbers at present (i.e., it contains
> both cfi and non-cfi data)?  If that's the case and it's hard
> for gdb to tell the difference, then I agree that we should
> make the above change.

No what I'm saying is that .dwarf_frame uses different register
numbers than .debug_info and other .debug_xxx sections.  This is
awkward and confusing because the same DWARF operations that refer to
register numbers are used in both sections but suddenly have a
different meaning.

Mark