SPARC Context Switch Code

[Sebastian Huber]

On 2014-02-07 14:20, Daniel Hellstrom wrote:
> Hello,
>
> That sounds correct to me and I'm glad some one brings this up, haven't tested
> it though. And while we're at it, I would like to discuss the usage of G5-G7. I
> have had that on my TODO for quite some time to investigate... As they are
> system specific and RTEMS does not use them I see no point in saving them, do
> you? RTEMS never seems to use G6,G7 so would could instruct GCC to use them and
> break the ABI for speed ;)

The G7 is used for thread-local storage:

http://git.rtems.org/rtems/tree/cpukit/score/cpu/sparc/cpu.c#n294

I don't know if other system reserved registers are used by GCC or linker 
trampolines.

-- 
Sebastian Huber, embedded brains GmbH

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