Re: ABIS and TLS (thread local support)

[Richard Earnshaw <Richard.Earnshaw%arm.com@localhost>]

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.

R.

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