ColdFire and Thread-Local Storage

[Sebastian Huber]

Hello Norbert,

thanks for the warning.

On 2014-01-29 20:50, Norbert Lange wrote:
> its been some time since I looked at the TLS conventions and I only done this
> on ARM.
> But I would strongly advise you to implement the function in asm, on ARM you
> arent allowed to change any register except the one you return and I would bet
> its the same on other architectures.

Yes, this is true for ARM, here __aeabi_read_tp() can clobber only r0.  On m68k 
the situation is different:

https://lists.debian.org/debian-68k/2007/11/msg00071.html

"This TLS ABI defines a function __m68k_read_tp, provided by libc.
This returns the thread pointer in register a0 (not d0) and may
clobber other call-clobbered registers.  The compiler will generate
calls to this function for the initial exec and local exec models."

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Sebastian Huber, embedded brains GmbH

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