On Fri, 4 Apr 2025 22:37:50 Tetsuya Isaki wrote: > At Thu, 3 Apr 2025 14:00:16 +0200, > > Martin Husemann wrote: > > > So these all nops are never executed just before any of f-line > > > instructions. > > > > Can you also please explain how you got at that NOP-after-f-line > > woraround? The Motorola errata text (at least the versions I found on > > the wayback machine) does not actually recommend this (it mentions NOP > > only for the instructions close to end of page bug). > > The nop-before-f-line (correction: s/after/before/) workaround is > noted as E4 at the original PR port-mac68k/13078. > But I can't find any other materials... > > And I know about the exception-at-end-of-page bug (No.10), too. > Whether this happens depends on the address of an unimplemented > floating point instruction. The nop-before-f-line workaround > affects (It may become to avoid or may become to hit) but doesn't > improve the errata No.10. > --- > Tetsuya Isaki <is...@pastel-flower.jp / is...@netbsd.org>
The changes to the context switch in sys/m68k have been reverted and the nop insertion by gas(1) has been turned off by default. Best regards, Nat
