Re: [PATCH] Fix xfail Sparc pattern

[Andrew Cagney <ac131313@cygnus.com>]

David, note the e-mail below:

> AFAIK, generic dummy frames work only with the AT_ENTRY mechanism.
> 
> But for 32 bit SPARC ABI we need ON_STACK, see
> http://sourceware.cygnus.com/ml/gdb/1999-q4/msg00064.html
> http://sources.redhat.com/ml/gdb-patches/2000-05/msg00041.html
> for an explanation.
> 
> I am afraid that we have to extend the generic dummy frame code to allow
> ON_STACK, if we want to use generic dummy frames for SPARC.
> 
> 
>> Hello,
>> 
>> If I remember one of those unwritten ``grand plans'' correctly, the 
>> intent is to have all targets switched to ``generic dummy frames''.  True?
>> 
>> Among other things, generic dummy frames do not save/restore registers 
>> on the target stack (instead they are cached locally) and this should 
>> improve the overall performance of an inferior function call.
>> 
>> Anyway, the thing that prompts this is PC_IN_CALL_DUMMY(PC, SP, FP). 
>> There are several implementations.  Only two:
>> 
>> - generic: looks for the FP in the list of dummy frames
>> - stack: looks for PC in [FP..SP)
>> 
>> require the SP/FP parameters.  I've a patch to fix the first one (search 
>> for the PC).  If the ARM, SPARC and i386 can switch to generic dummy 
>> frames then those parameters can be eliminated and all calls simplified.
>> 
>> Any chance of having these converted?
>> 
>> Andrew
>> 
>> 
>> 
> 
> 
>