MPC8xx: Bad emulation
Michael R. Zucca
mrz5149 at acm.org
Mon Jun 14 12:41:22 EST 1999
At 5:11 AM -0400 6/11/99, Wolfgang Denk wrote:
>There are *many* situations where it is really necessary to be able
>to run _any_ binary from a standrad LinuxPPC distribution on the 860,
>too. I agree that it makes sense to recompile dedicated applications
>for an embedded solution.
Then what you may wish to do is develop a software FPU for the PPC860. That
is, have the OS patch the illegal instruction trap so that it jumps to
emulation code when the instruction is an FP instruction.
I'm surprised. I thought we were already doing this. This sort of thing
has been done forever on the 68k to emulate the 68881/2 FPU. It's slow but
if you don't plan on doing much floating point, it's perfectly acceptable.
Michael Zucca - mrz5149 at acm.org - http://www.mdc.net/~mrz5149/
"I will choose a path that's clear. I will choose Freewill. "
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