[PATCH] [POWERPC] convert transfer_to_handler into a macro

[Kumar Gala]

On Apr 29, 2008, at 4:28 PM, Paul Mackerras wrote:
> Kumar Gala writes:
>
>> We need to have unique transfer_to_handler paths for each exception  
>> level
>> that is supported.  We need to use the proper xSRR0/1 depending on  
>> which
>> exception level the interrupt was from.  The macro conversion lets up
>> templatize this code path.
>
> It seems to me that this implies you are assuming that you will never
> ever get a synchronous normal interrupt such as a TLB miss while you
> are in a critical or machine check handler.

Grr.. one more thing to fix :)

> Wouldn't it be better and safer to have the exception prolog for
> critical interrupts save SRR0/1 in the stack frame, and have the
> prolog for machine checks save SRR0/1 and CSRR0/1 likewise?

If we do this I guess we can use SRR0/1 regardless of which level we  
came from.

- k