Re: [RFA] New GDB target iq2000

[Daniel Jacobowitz <drow@false.org>]

On Tue, Feb 22, 2005 at 12:41:41PM +0100, Corinna Vinschen wrote:
> Hi,
> 
> this posting contributes the iq2000 code for GDB.
> 
> There's just one problem with it.  Older GCC code (older than two days,
> actually), emits an asymmetrical register numbering in the dwarf2 debugging
> output.  The iq2000 uses register 31 as link register, which contains the
> return address to the calling function.  For some reason GCC emitted the
> register number 26 in the dwarf2 information for this register.  Every
> other register has been used unchanged in dwarf2, so there was no
> unambiguous translation from dwarf2 register numbers to real register
> numbers, if the dwarf2 register was "26".  This has been fixed yesterday
> in GCC HEAD.
> 
> As a result, the dwarf2 frame sniffer has a problem with code generated
> by GCC's older than two days.  This is no problem for the iq2000 frame
> sniffer implemented in iq2000-tdep.c, but as usual, the iq2000 frame
> sniffer is appended after the dwarf2 frame sniffer:
> 
>     frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
>     frame_unwind_append_sniffer (gdbarch, iq2000_frame_sniffer);
> 
> Would that be a good reason to disable the dwarf2 frame sniffer for now?
> Or shall I leave that as is?

This is OK; I'll handle the linetable issues separately.

-- 
Daniel Jacobowitz
CodeSourcery, LLC