On Sep 12, 2012, at 7:04 AM, Martin Husemann wrote: > On Wed, Sep 12, 2012 at 01:00:52PM +0000, Christos Zoulas wrote: >> This is orthogonal. I believe that in the discussion we had in core >> we decided to not define _UC_TLSBASE unconditionally, and that ports >> should define it as needed. > > What does "as needed" mean here? Can you show an example of an arch not > needing it?
arm and mips for instance. They both have instructions that fetch the TCB pointer thus it's not kept in a specific register and not in the mcontext structure. So they don't need _UC_TLSBASE since it will never be present in the ucontext_t.
