Re: Summary of the ARM ports BoF at DC15
On Mon, 2015-09-14 at 15:31 +0200, Paul Wise wrote:
> On Mon, Sep 14, 2015 at 2:29 PM, Lucy Wayland wrote:
> > On Sat, Sep 12, 2015 at 03:55:38PM +0100, Ian Campbell wrote:
> > > On Fri, 2015-09-11 at 16:58 +0100, Steve McIntyre wrote:
> > > Does this issue go away entirely if we move from a v4t to v5 base, or
> > > are there also v5 instructions which are (potentially) absent in v8?
> > > (I
> > > think so, but I don't have my references to hand).
> >
> > SWP and SWPB - these were deprecated in ARMv7 but absent in ARMv8.
Ah yes, thanks.
> Should we have a lintian or other archive-wide scan for these
> instructions in the arm64 arch?
ARMv8 AArch64 (== Debian arch arm64) has a different ISA from ARMv7 and
earlier, so I think that aarch64 simply doesn't have those instructions and
so there is no encoding and they cannot possibly exist in an arm64 binary.
Perhaps a scan for _deprecated_ instructions in armhf, representing things
which would be a problem when armhf was run in AArch32 mode on an ARMv8
processor would be useful?
+ what Wookey said wrt armel.
Ian.
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