[U-Boot] armv8: shrink exception table code

[Tom Rini]

On Mon, Nov 27, 2017 at 12:47:09AM +0000, Andre Przywara wrote:

> In the moment our exception entry code needs 34 instructions, so we
> can't use put it directly into the table entry, which offers "only"
> 32 instructions there. Right now we just put an unconditional branch
> there, then use a macro to place the 34 instructions *per entry* after
> that. That effectivly doubles the size of our exception table, which
> is quite a waste, given that we use it mostly for debugging purposes.
> 
> Since the register saving part is actually identical, let's just convert
> that macro into a function, and "bl" into it directly from the exception
> slot, of course after having saved at least the original LR.
> This saves us about 950 bytes of code, which is quite a relief for some
> tight SPLs, in particular the 64-bit Allwinner ones.
> 
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>

Applied to u-boot/master, thanks!

-- 
Tom
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