185e1a7b27
In the profiler, when unwinding the stack, we have special handling for VDSO calls. Currently, the special handling is only used when the normal unwinding fails. If the signal lands in the function that makes the VDSO call (e.g. nanotime1) and after the stack switch, the normal unwinding doesn't fail but gets a stack trace with exactly one frame (the nanotime1 frame). The stack trace stops because of the stack switch. This 1-frame stack trace is not as helpful. Instead, if vdsoSP is set, we know we are in VDSO call or right before or after it, so use vdsoPC and vdsoSP for unwinding. Do the same for libcall. Also remove _TraceTrap for VDSO unwinding, as vdsoPC and vdsoSP correspond to a call, not an interrupted instruction. Fixes #56574. Change-Id: I799aa7644d0c1e2715ab038a9eef49481dd3a7f5 Reviewed-on: https://go-review.googlesource.com/c/go/+/455166 Run-TryBot: Cherry Mui <cherryyz@google.com> Reviewed-by: Michael Pratt <mpratt@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> |
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