On Sat, 8 Nov 1997, Richard B. Johnson wrote:
> On Sat, 8 Nov 1997, Billy Harvey wrote:
>
> > Do the unimplemented opcodes perhaps raise a flag anywhere in the CPU
> > that we could test for?
> >
> > Billy Harvey
> >
> Illegal opcodes, or instructions that are not appropriate in user-mode
> __should__ cause a trap, which is caught by priviliged kernel code.
> That code would normally kill the task with a "core-dump". It could
> also choose to ignore the instructions. For instance, user mode code
> can issue a CLI instruction followed by a HLT and nothing will happen
> (last time I checked). This allows a user to write and test sections
> of code in "user-land" that may eventually exist within the kernel.
>
>
> Cheers,
> Dick Johnson
>
> Richard B. Johnson
> Project Engineer
> Analogic Corporation
> Penguin : Linux version 2.1.60 on an i586 machine (66.15 BogoMips).
> Warning : It's hard to remain at the trailing edge of technology.
>
>
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Phil Brutsche
"Be of stout heart, Number One. We've handled the Borg. We can
certainly handle Admiral Jellico." - Jean-Luc Picard
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