>
> I still wonder how a 32-bit system can generate an unaligned access trap for
> an
> access to a 64-bit variable aligned on 32-bit, given that there is, by
> definition, no 64-bit memory accesses available on the architecture ?
>From the SPARC V8 manual (this is the 32 bit version of SPARC):
Load/Store Instructions
...
Integer load and store instructions support byte (8-bit), halfword
(16-bit), word
(32-bit), and doubleword (64-bit) accesses.
...
Alignment Restrictions
Halfword accesses must be aligned on a 2-byte boundary, word accesses (which
include instruction fetches) must be aligned on a 4-byte boundary, and
doubleword
accesses must be aligned on an 8-byte boundary. An improperly aligned
address causes a load or store instruction to generate a
mem_address_not_aligned
trap.
Sam
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