Marco van de Voort wrote:
On Sat, Dec 08, 2007 at 03:43:30AM +0100, Ivan Voras wrote:
Which of the architectures FreeBSD supports (if any) have strict memory
alignment requirements? (in the sense that accessing a 32-bit integer
not aligned on a 32-bit address results in a hardware trap/exception).
I do know that older PPCs (PowerPC603) have a requirement on aligning of
floats.
IIRC the e.g. Linux the kernel hooks an exception handler that makes it
transparent for apps (at the cost of some performance), and NetBSD does not
I never ran FreeBSD on PPC, so I wouldn't know that one.
The newer 32-bit PPCs (G4 / PPC7447A) can't handle unaligned 64-bit
accesses
either - they generate a trap which gets handled by fix_unaligned in
/sys/powerpc/powerpc/trap.c on FreeBSD.
--
Bruce
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