[ECOS] ARM vector.s -- suspicious code in return_from_exception

[Michael Anburaj]

Hi,

> > We probably haven't been bitten by this because I don't think we
> > have any boards that make much use of FIQ.
> >
>
>Most boards I've used with FIQ use their own VSR anyway.
>

Just a thought!

The idea behind FIQs is to keep things simple along its code path. So that 
it can truly be a fast interrupt. All the FIQ code should do is handle the 
interrupt that caused it & return back to the previous mode. Task switch & 
things like that need not happen in a FIQ & the return path for this should 
be kept different from IRQ & need for switching to SVC mode & thus 
corrupting its SPSR can be avoided. Straight & simple FIQ path & the kernel 
need not be aware of FIQs.

Cheers,
-Mike.

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