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Re: sparc v9 global register usage
On Sat, 22 Aug 2009, raymond.meyer%rambler.ru@localhost wrote:
> What ABI does NetBSD follow on sparc v9 in regard to global registers,
> i.e. is it different to the following:
> Say I have the following code:
> 1. set global reg G to memory address;
> 2. call library function;
> 3. use global reg G to load data at that memory address;
> At line 3 I get segmentation fault, I assume that's because when I call
> library function at line 2, it resets that global register to some
> other value.
> So, what global registers can I use which are not volatile across
> function/library calls?
I wouldn't use globals. Quite a few of the assembly language routines in
libc are directly from the SPARC v8 or predate the current V9 ABI code
thus have different register use conventions. I suppose someone who has
lots of time to waste could audit the register use in the libraries and
ld.so and make them V9 ABI compiant.
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