Re: [RFA] New GDB target iq2000

Daniel Jacobowitz
2005-03-07T21:35:37Z

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.