Re: [PATCH] Fix xfail Sparc pattern

Andrew Cagney
2002-04-18T22:29:21Z

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
>>
>>
>>
>
>
>