Peter Zijlstra 5a9c361a41 objtool: Allow STT_NOTYPE -> STT_FUNC+0 sibling-calls
Teach objtool about STT_NOTYPE -> STT_FUNC+0 sibling calls. Doing do
allows slightly simpler .S files.

There is a slight complication in that we specifically do not want to
allow sibling calls from symbol holes (previously covered by STT_WEAK
symbols) -- such things exist where a weak function has a .cold
subfunction for example.

Additionally, STT_NOTYPE tail-calls are allowed to happen with a
modified stack frame, they don't need to obey the normal rules after
all.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
2022-10-17 16:41:09 +02:00
..
2022-03-31 11:59:03 -07:00
2022-09-27 18:30:49 -04:00