On 3/11/10, Martin Guy <[email protected]> wrote:
> You can test for that by going
> # echo 5 > /proc/cpu/alignment
> and running your test again. On unaligned access the program will then
> die with SIGBUS instead of merrily going on its way with corrupted
> values.
Note that QEMU does not emulate either the unaligned data corruption
on /proc/cpu/alignment=0 nor the bus error on /proc/cpu/alignment=5;
it always (on x86) performs a fixup, fetching in the "usual" way from
*p to *[p+3], presumably because it compiles to an x86 word fetch.
Real hardware is needed to test for word alignment errors.
M
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