Re: Workaround for Alpha libstc++ unaligned access problem

[David Huggins-Daines <dhd@eradicator.org>]

Jason Gunthorpe <jgg@ualberta.ca> writes:

> On 21 Feb 2000, David Huggins-Daines wrote:
> 
> > 3) C++ runtime support that reads the frame info in exception handlers
> >    (gcc/frame.o)
> 
> Won't this also generate unaligned faults when they access the
> information? Has anyone tested an actual exception throw to see how many
> faults crop up?

No - read the code in gcc/frame.c - it already *expects* this
information to be unaligned (in fact that's where I took the code to
read unaligned quadwords from :).  This is why I suspect that the
ld.so workaround is the only way to fix this - gas knows it's
unaligned, ld knows it, the runtime knows it, only ld.so doesn't...