[Bug 195] powerpc: ABI confusion

[bugzilla-daemon at rtems.org]

http://www.rtems.org/bugzilla/show_bug.cgi?id=195





--- Comment #4 from Joel Sherrill <joel.sherrill at oarcorp.com>  2008-01-10 14:28:05 ---
(In reply to comment #3)
> (In reply to comment #1)
> > Fix:
> > Clarify the ABI situation.
> > 
> > From Thomas Doerfler:
> > EABI and SVR4 are sufficently similar to accept the setting "no-eabi" for multilib generation. Only data type "long double" inside structures at non-16-byte-aligned positions might lead to trouble.
> 
> From Till Straumann:
> Stack alignment is also different; EABI requires 8-bytes, SVR4 16-bytes.
> RTEMS currently aligns the stack only to 8-bytes (since EABI is the default).
> This is in violation of SVR4 but largely goes unnoticed (but it breaks
> e.g., altivec which needs 16-byte stack alignment. Altivec is AFAIK compatible
> with svr4 but not eabi).
> 

Making the stack 16-byte aligned is OK if that helps.  


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