[PATCH] Add support for FP emulation for the e300c2 core

[Benjamin Herrenschmidt]

> +BEGIN_FTR_SECTION
> +/*
> + * certain freescale cores treat 'normal' floating point instructions
> + * as FP Unavail exception.  Redirect to normal illegal/emulation handling.
> + */
> +	b 	ProgramCheck
> +END_FTR_SECTION_IFSET(CPU_FTR_FP_TAKES_FPUNAVAIL)
>  	EXCEPTION_PROLOG
>  	bne	load_up_fpu		/* if from user, just load it up */
>  	addi	r3,r1,STACK_FRAME_OVERHEAD

Do you absolutely need that ? Is there any way those cores will actually
send a "normal" FPUnavail exception ? If not, don't bother. There aren't
that many CPU feature bits left so let's not use one for something that
never happens.

Ben.