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The thread stack derives return addresses from IP + insn_len. For an
interrupt or fault, the return address can instead be the sample IP even
when instruction bytes at that address are available.
Add ret_addr to perf_sample and prefer it in thread_stack__trace_end()
and thread_stack__process() when supplied. Initialize it to zero so other
samples retain the IP + insn_len calculation.
Add a regression test for explicit exception return addresses and the
ordinary call fallback when the return address is zero.
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
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