[PATCH] ppc32: refactor FPU exception handling

Kumar Gala kumar.gala at freescale.com
Tue Apr 12 15:42:36 EST 2005


Sorry about that, we have had some back and forth on this on the ppc 
embedded list.

Not sure I understand your concern about the duplication of the fast 
exception return path?  Jason's patch pretty much just moved code out 
of head.S into fpu.S so we dont duplicate it between head.S and 
head_44x.S & head_fsl_booke.S

- kumar

On Apr 11, 2005, at 9:28 PM, Benjamin Herrenschmidt wrote:

> On Mon, 2005-04-11 at 17:02 -0500, Kumar Gala wrote:
>  > Andrew,
>  >
> > Moved common FPU exception handling code out of head.S so it can be 
> used
> > by several of the sub-architectures that might of a full PowerPC 
> FPU. 
> >
> > Also, uses new CONFIG_PPC_FPU define to fix alignment exception
> > handling for floating point load/store instructions to only occur if 
> we
> > have a hardware FPU.
> >
> > Signed-off-by: Jason McMullan <jason.mcmullan at timesys.com>
> > Signed-off-by: Kumar Gala <kumar.gala at freescale.com>
> Andrew, please hold on this patch, it hasn't been properly discussed
>  with the relevant maintainer, that is Paul Mackerras.
> I can see matter for debate in there, like the whole duplication of the
>  fast exception return path...
> It's also touching quite sensitive bits of kernel code (head.S) that
>  needs careful auditing and testing before beeing pushed upstream.
> Ben.

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