Re: when does do_fpe() get called? (or when does FPE happen?)

[Ralf Baechle <ralf@linux-mips.org>]

On Tue, Jan 28, 2003 at 09:37:42AM -0800, Jun Sun wrote:

> > > Can someone enlighten me a little?  I am trying
> > > to figure out what the FPU state should be (or can be) when
> > > we are inside do_fpe() routine.
> > 
> > Checkout the various flags in $fcr31.  Whenever one of the enabled
> > exceptions is triggered we get to handle_fpe via do_fpe.  In addition
> > the unimplemented exception can also result in invocation of do_fpe.
> >
> 
> So it seems safe to assume FPU should have been enabled when we get
> here, right?

Yes, otherwise we'd get a coprocessur unusable exception.

  Ralf