[Olsr-dev] alignment problems on FreeBSD-arm with inbuf and msg_buffer

[Henning Rogge]

On Montag 23 März 2009 13:24:18 John Hay wrote:
> Hi,
>
> Trying to get the latest 0.5.6 tip working on FreeBSD-current on an ARM
> processor, I encountered bus errors which I traced back to the inbuf
> and msg_buffer arrays that are non-aligned and cause the bus error as
> soon as a 16 bit or 32 bit variable is read or written to it.
>
> I do not understand why I have not encountered it before because it
> looks like inbuf and msg_buffer has been like that for some time.
> Maybe the compiler changed or the functions used to access those
> variables.
>
> My fix was to put the arrays in an union with an int. Is there a
> better way?
What do you think about this ?

> -static char inbuf[MAXMESSAGESIZE + 1];
> +static uint32_t inbuf_alinged[(MAXMESSAGESIZE+4)/sizeof(uint32_t)];
> +static char *inbuf = (char *)inbuf_aligned;

Henning

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