On Wed, 2014-12-03 at 23:23 +0000, peter green wrote: > I vaugely remember something a while back about some deprecated 32-bit > arm instructions needing kernel emulation on armv8 and that emulation > not being implemented yet.
That's correct, and IIRC swp is one of those instructions. > AIUI swp is already handled through kernel emulation on armv7 > multiprocessor systems. There seem to be patches to port that emulation > to arm64 but it doesn't appear they are in the kernel tree debian is > using. > Having 32-bit binaries break on armv8 systems due to lack of the > swp instruction does not seem like a good thing so IMO we really want > this in our kernels before release. If those patches have gone into a later upstream kernel than we have in Jessie (v3.16) then we should certainly backport them. IIRC they were controversial though, so if they haven't hit mainline I'd be *very* reluctant to "fork" the v8 userspace ABI. Ian. -- To UNSUBSCRIBE, email to debian-arm-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/1417682318.2372.44.ca...@hellion.org.uk