Hey Scott,

Thanks for the reply, I shall investigate further.

I wasn't talking about interrupt handlers in Linux as such, but using powerpc-eabi-gcc to write an ISR for the MPC5516. (I guess that could be off-topic on this mailing list, but I thought the folks on this mailing list would probably know the answer pretty easily). I was hoping that gcc would generate the prologue and epilogue code for me via the interrupt attributes.

Many thanks.
Tehn Yit Chin



On Fri, Mar 21, 2008 at 4:18 AM, Scott Wood <scottwood@freescale.com> wrote:
Tehn Yit Chin wrote:
> Hi all,
>
> Apologies for such a basic question. I am trying to write an ISR on a
> MPC551x. When I tried to use the interrupt attribute with
> powerpc-eabi-gcc such as
>
> _attribute_((interrupt_handler)) foobarISR(void)
> {
> }

Assuming you're talking about an interrupt handler in Linux, you don't
need to do anything like that.  The actual interrupt entry is assembly
code.  Search existing drivers for "irqreturn_t" to find examples of
what an interrupt handler looks like, and "request_irq" for how to hook
the handler into the interrupt.

-Scott