[PATCH v2] ARM: teach __asmeq that r11 == fp and r12 == ip

[Russell King - ARM Linux]

On Thu, Jan 29, 2015 at 09:44:46AM +0000, Ard Biesheuvel wrote:
> The __asmeq macro is used inside inline asm statements to ensure that
> register asm variables that explicitly specify a register are mapped
> correctly onto those registers when used in inline asm input and output
> constraints. However, the string based matching fails to take into account
> that 'fp' is often referred to as 'r11' and 'ip' is often referred to as
> 'r12', (e.g., by clang), causing false negatives.
> 
> Fix this by making __asmeq consider the ("fp","r11"), ("r11","fp"),
> ("ip","r12") and ("r12","ip") cases specifically.
> 
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>

The method adopted is rather horrid in itself, but I guess there's no
other way to deal with this... so I'm okay with the patch.  (I won't
say I'm happy with it!)

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