- no support for call0 ABI in current gcc;
- nobody in Cadence is currently working on implementing it;
- whether that support could be implemented by Cadence is discussed, my estimation that the answer would be positive is low.
sounds wrote:I'm pretty good at gcc hacking, but I wouldn't want to undertake updating the Xtensa support in gcc all by myself.
I have almost no knowledge of gcc internals, but I've a lot of experience with xtensa architecture. Please let me know if I can be of any help implementing call0 ABI.