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Re: ABIS and TLS (thread local support)

On Wed, 2008-04-30 at 23:05 -0700, Matt Thomas wrote:
> When we go to libc.13, I was wondering if we should also at least  
> compile stuff so
> that if/when we support the thread local support ELF relocations &  
> ABI, we don't
> have to rebuild everything.  For ARM, this would be simply excluding  
> the use of
> r9.

While the ARM EABI permits reserving r9 as a TLS register, the ARM Linux
developers concluded that this wasn't a good use of the resource.  More
recent processors have a register visible in cp15 that can be used for
the TLS base, and various solutions were adopted to support older cores.
I'd strongly suggest we adopt similar solutions in NetBSD.


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