2b82a4f488
Currently the runtime only tracks the PC and SP upon entering a syscall, but not the FP (BP). This is mainly for historical reasons, and because the tracer (which uses the frame pointer unwinder) does not need it. Until it did, of course, in CL 567076, where the tracer tries to take a stack trace of a goroutine that's in a syscall from afar. It tries to use gp.sched.bp and lots of things go wrong. It *really* should be using the equivalent of gp.syscallbp, which doesn't exist before this CL. This change introduces gp.syscallbp and tracks it. It also introduces getcallerfp which is nice for simplifying some code. Because we now have gp.syscallbp, we can also delete the frame skip count computation in traceLocker.GoSysCall, because it's now the same regardless of whether frame pointer unwinding is used. Fixes #66889. Change-Id: Ib6d761c9566055e0a037134138cb0f81be73ecf7 Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-nocgo Reviewed-on: https://go-review.googlesource.com/c/go/+/580255 Auto-Submit: Michael Knyszek <mknyszek@google.com> Reviewed-by: Michael Pratt <mpratt@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Cherry Mui <cherryyz@google.com> |
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