[OpenBIOS] [PATCH] arch/ppc/qemu: Moved exception handlers from beginning of RAM

[BALATON Zoltan]

On Wed, 28 May 2014, Alexander Graf wrote:
> So do you happen to have any idea why the code was written the way it was 
> written? I don't feel very confident that I grasp why the original author did 
> it that way.

No I don't have any idea why it looks like this but maybe only because 
previous changes wanted to preserve as much as possible (or change as 
little as possible) and they have added up like this. Looking at the 
commit logs I've found the following:

- The exception_return part has been there from the beginning.

- In r945 afaerber added call_[di]si_exception to free up 0x380 and 0x480 
for illegal vectors.

- The real_[di]si jumps has been added in r1043 by agraf probably because 
adding more instructions to the EXCEPTION_PREAMBLE made it not fit in 0x80 
bytes any more.

So I think you should now better as it seems you two are the original 
authors.

Regards,
BALATON Zoltan