[Fwd: Fix arm_addr_bits_remove: 26-bit Thumb doesn't exist]
Fernando Nasser
fnasser@redhat.com
Mon Oct 22 06:18:00 GMT 2001
Thank you Nick and Richard.
I haven't heard anything on the contrary from Scott (native ARM)
so I will check this in later today or tomorrow.
Thanks for the patch Ben.
Regards to all,
Fernando
Nick Clifton wrote:
>
> Hi Fernando, Hi Ben,
>
> > From: Ben Harris <bjh21@netbsd.org>
> >
> > I haven't actually encountered this bug in reality yet, but it looks
> > to me as if arm_addr_bits_remove() is bogus. Specifically, it has a
> > case for Thumb state in a 26-bit mode. According to the ARM ARM
> > (2nd Edition, section A8.1), no processor will support both 26-bit
> > mode and thumb state at all, let alone at the same time. I suspect
> > this might be a noticeable problem when debugging SVC mode code,
> > since then R15 will have its bottom bit set, which arm_pc_is_thumb()
> > is likely to interpret as meaning the CPU is in Thumb state.
> >
> > ChangeLog entry:
> >
> > 2001-10-20 Ben Harris <bjh21@netbsd.org>
> >
> > * arm-tdep.c (arm_addr_bits_remove): Don't believe in 26-bit
> > Thumb.
>
> This looks like a reasonable patch to me. I do not have the authority
> to approve it, but I would certainly recommend it to the GDB
> maintainers.
>
> Cheers
> Nick
--
Fernando Nasser
Red Hat Canada Ltd. E-Mail: fnasser@redhat.com
2323 Yonge Street, Suite #300
Toronto, Ontario M4P 2C9
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