thread-ready ABIs

[Phil Blundell]

>Now, what is about the rest?  I assume cris isn't much of a problem
>since it's a purely embedded machine.
>
>Arm: don't know whether this should fall in the same category.
>Philip?

I am planning an ABI change for Linux in the libc 2.3 timeframe in any
case, so this would be a good opportunity to introduce a thread
register.  I'll bring it up with the ARM EABI group and see if we can
get consensus on which register to use.

p.