what marks the end of stack?

[Oliver Kowalke]

What marks the end of stack or how does uw_frame_state_for() detect the end of stack?
I've a coroutine library and I'm using _Unwind_ForcedUnwind() for stack cleanup. Function _Unwind_ForcedUnwind_Phase2() never sets _URC_END_OF_STACK!

any ideas?

Oliver
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