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Re: fpintr: FPU not belonging to anyone!

From: Roland McGrath
Subject: Re: fpintr: FPU not belonging to anyone!
Date: Tue, 21 Aug 2001 21:51:14 -0400 (EDT)

The point is that fpintr should not be happening in a state where fp_thread
is null.  That suggests that the FPU state switching might have failed to
operate.  Any FPU operation should generate the FPU not-present fault and
get to fpnoextflt, which is what switches the thread's FPU state back into
the hardware after a context switch.  If this didn't happen, then it's
possible that the current thread has been running for a while and using the
FPU (before it generated the interrupt that got to fpintr) but never had
its proper PFU state swapped in before it started using the FPU.

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