Re: CVS commit: src/sys/arch/m68k/m68k

[Tetsuya Isaki <isaki%pastel-flower.jp@localhost>]

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 <isaki%pastel-flower.jp@localhost / isaki%NetBSD.org@localhost>