Mark Johnston 5f05bda607 DTrace aarch64: Avoid calling unwind_frame() in the probe context.
unwind_frame() may be instrumented by FBT, leading to recursion into
dtrace_probe(). Manually inline unwind_frame() as we do with stack
unwinding code for other architectures.

Submitted by:	Domagoj Stolfa
Reviewed by:	manu
MFC after:	1 week
Sponsored by:	DARPA / AFRL
Differential Revision:	https://reviews.freebsd.org/D15359
2018-05-12 15:35:26 +00:00
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