Marc wrote:
> "Charles Lindsey" wrote:
>
>
>>In SPARC systems, what conventions apply to the use og the register %g7?
>>
>>For example, under Solaris 10 (or under the libc that comes with it), the
>>lmutex_unlock function starts off like this:
>
> [...]
>
>>where it is evident that %g7 is a globally understood register (presumably
>>pointing to some globally known collection of variables).
>
> [...]
>
>>And I have observed that even my somewhat ancient Sun C compiler never
>>seems to make use of %g7.
>>
>>OTOH, I have another compiler, nothing to do with Sun, that is not aware
>>of %g7 being reserved for anything. So as a result I have a program that
>>worked fine under Solaris 7, bur breaks in Solaris 10.
>
>
> This blog post should answer all your questions:
>
> http://blogs.sun.com/morganh/entry/a...king_the_rules
>

The question it fails to answer is WHERE IS THIS DOCUMENTED! I'm not
personally concerned because the likelihood of my doing any assembler
language programming is just about zero! Still, it's reasonable to
expect this restriction to be documented and documented in a place where
it will be found by anyone doing SPARC assembler language programming.