Re: [avr-chat] AVR C-ABI

[Michael Hennebry]

On Wed, 7 Jan 2009, Joerg Wunsch wrote:

> There's no more available than what you have found there.
> (Documentation) patches are welcome!
>
> Arguments are normally passed in registers, down to r8.  Excess
> arguments that don't fit into that many registers are passed on the
> stack.  Variable arguments are always passed on the stack.  structs
> are returned by reference, where the caller allocates the space, and
> passes the address down to the callee (IIRC this address is passed as
> the first argument to the callee).

That is not in the FAQ.
Not having returned structs between C and assembly,
I'd never had occasion to check.

Likewise, it doesn't state the order in which stack arguments are pushed.
Also something I haven't needed to know.
Something I don't know.

--
Michael   address@hidden
"Pessimist: The glass is half empty.
Optimist:   The glass is half full.
Engineer:   The glass is twice as big as it needs to be."