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- Handle lazy fpu context switches correctly for ptrace(2).
- Don't read $fcr31 on context switch, it's pure bloat.
- New processes get $fcr31 initialized to no exceptions.
- First beginnings of floating point support kernel code. For now we
only can handle cvt.w.s and cvt.w.d instructions where the source
register is a NaN, infinity or denorm. This is good enough to get
Mozilla up.
- Don't send SIGFPE on every floating point instruction we don't know
how to handle, rather just complain.
- Cleanup headerfile inclusions in the HPC3 code.
- Fix the definition of PAGE_NONE.
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