FP register corruption in Exynos 4210 (Cortex-A9)

Russell King - ARM Linux
2014-10-08T08:35:09Z

On Wed, Oct 08, 2014 at 05:19:19AM -0300, Lanchon wrote:
> for instance, you say that if an ISR uses the FPU it would corrupt user
> FP state. fine, but it is not that simple. what if the FPU was disabled
> at the time of interrupt? (ie: lazy restore did not yet happen in this
> time-slice.)

At that point, it depends on which kernel version you are using. Yes,
older kernels will just restore the state. Newer kernels will trap this
and complain.

> a plausible answer (which i am making up out of the blue) would be:

If you want to continue asking questions and getting answers, change
your attitude; I am not a child.

You should also consider *not* writing essays, but instead ask clear,
direct and to the point questions - in other words, short emails. Not
everyone has the time or the patience to read huge long emails, or
huge rambling threads of 50+ pages on web forums.

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