Thanks! This happens to work for me, but the root of the problem is the same: there's no guarantee that the handle will still be in that register when the funct

Thanks! This happens to work for me, but the root of the problem is the same: there's no guarantee that the handle will still be in that register when the function returns; my compiler just happens to not be clobbering that register. Anyway, this is probably good enough as a bpf demonstration and it definitely has made its impact looking at other comments here. That's probably all that matters.