[PATCH] gas: m68k M680LC040 F-LINE NOP insertion fixing emulation of fpu instructions

[Joel Sherrill]

Wow! The m68lc040 was on some mvme162 board variants. Over at RTEMS.org, we
just recently cut the last release series with BSPs for m680x0 hardware. We
did not remove basic CPU support for any m68k CPUs because we have Coldfire
BSPs for at least one more release series. Removing cpu variant support was
surgery we did not want to do.

Is there a way to know if the errata applies? I'm asking for posterity.

Thanks.

--joel sherrill



On Sat, Mar 29, 2025, 10:54 PM Nathanial Sloss <nathanialsloss@yahoo.com.au>
wrote:

> Hi,
>
> The m68k m68lc040 (early revisions) have an issue after executing f-line
> (co
> processor mmu/fpu) instructions and executing a trap in the case of fpu
> emulation.
>
> Unfornately due to time passed the processor errata as to how to address
> the
> issue has been lost.
>
> Fortunately the issue was documented in a NetBSD PR:
>
> http://gnats.netbsd.org/13078
>
> Which proposes a solution to the problem which I have patched the GNU
> assembler for.
>
> As I have an affected machine with an lc040 processor I can confirm that
> all
> programmes compiled with the patched assember work as expected.
>
>
> Best regards,
>
> Nat
>
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