"diba...@libero.it" <diba...@libero.it> writes:
>>> I have something like this on a 32 bit little endian arm9 board (SAM9L9260):
>>>
>>> char buffer[] = { 0, 1, 2, 3, 4, 5, 6, 7 };
>>>
>>> long A = * ( (long*) buffer );
>>> long B = * ( (long*) (buffer + 2) );
>>>
>>> printf("A: %08x B: %08x", A, B);
>>>
>>> I would expect that A = 0x03020100 and B = 0x05040302
>>> instead I get the right value for A but B is 0x01000302 or
>>> something like this but anyway not what I expect.
>>> Is there something wrong on the board? It seems that only 4
>>> bytes aligned long are read correctly.
>>
>>ARM9 does not support unaligned load/store. Yours is apparently
>
>>configured in the round-and-rotate mode.
>>
> Then my code is simply wrong, that is, not allowed? If I have to
> port code from a PPC (that handles unaligned accesses) to an ARM9 it
> is painful operation..., isn't it?
If your code relies on unaligned memory accesses, then yes, making it
run on an ARM9 might not be much fun. I would suggest you set the
processor to trap on unaligned accesses (the manual will tell you how).
That should make it easier to find them all.
--
Måns Rullgård
m...@mansr.com
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