| commit | a93a4c178025b52be85c9eb4b9f2815716a62d11 | [log] [tgz] |
|---|---|---|
| author | Cherry Zhang <cherryyz@google.com> | Tue Aug 04 20:25:10 2020 -0400 |
| committer | Cherry Zhang <cherryyz@google.com> | Mon Aug 10 18:06:04 2020 +0000 |
| tree | 85499b8d785eea7bd3ec0752da80d285fd9d52f3 | |
| parent | ba9e10889976025ee1d027db6b1cad383ec56de8 [diff] |
runtime: make nanotime1 reentrant Currently, nanotime1 (and walltime1) is not reentrant, in that it sets m.vdsoSP at entry and clears it at exit. If a signal lands in between, and nanotime1 is called from the signal handler, it will clear m.vdsoSP while we are still in nanotime1. If (in the unlikely event) it is signaled again, m.vdsoSP will be wrong, which may cause the stack unwinding code to crash. This CL makes it reentrant, by saving/restoring the previous vdsoPC and vdsoSP, instead of setting it to 0 at exit. TODO: have some way to test? Change-Id: I9ee53b251f1d8a5a489c71d4b4c0df1dee70c3e5 Reviewed-on: https://go-review.googlesource.com/c/go/+/246763 Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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