Perhaps all architectures "should", but I can assure
you that many of them do no such thing. I didn't
look at every current architecture, but some notable
ones like the brand new IA64, as well as some older
chips such as MIPS have some relatively complicated
code in get_unaligned(), which can be found in the
appropriate include/asm-<arch> directory in the
file unaligned.h. I suspect that at least some of
these allow for an exception handler to fake the
capability in user space programs, but that isn't
something you can allow inside the kernel.
Brad Boyer
flar@allandria.com
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