[OpenBIOS] libgcc problem

Andreas Färber andreas.faerber at web.de
Sat Oct 16 17:43:30 CEST 2010


Am 03.10.2010 um 17:59 schrieb Blue Swirl:

> I finally found out the cause of the problem that prevented us to
> remove our copy of libgcc. The problem was that when switching to the
> libgcc provided by GCC, there would be strange crashes. The cause of
> these crashes is that the libgcc shipped with GCC is compiled with
> default options, in Sparc64 case the machine model is 'embmedany'.
> This makes memory accesses use %g4 as base register and since we don't
> initialize it (because other code uses machine model 'medany'), there
> will be crashes due to random base with some memory accesses in
> libgcc. It's clear that the default machine model for Sparc64 is not
> compatible with OpenBIOS, as is any libgcc compiled with this model.

I tried compiling RTAS with $(CC) and -lgcc as in your patch, but it  
fails to link with an undefined symbol _savegpr_31. That's one of  
those in crtsavres.S. Any idea? The patched sparc64 gcc seemed only  
necessary for runtime crashes iiuc.


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