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runtime: clear upper half of sec in ARM walltime

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https://golang.org/cl/246763 accidentally changed this to assign the old
value of vdsoPC to the upper half of sec as that is the last value in
R1.

The old value of vdsoPC is usually zero, so this typically works.
However, the reentrant case will have a non-zero value, resulting in a
bogus returned time. I am unsure if walltime is reachable from a signal
handler, so this may never occur.

Change-Id: I8562d6ec2a845fcffee9618d994b8ea57fbd199e
Reviewed-on: https://go-review.googlesource.com/c/go/+/361159
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This commit is contained in:
Michael Pratt 2021-11-03 16:28:51 -04:00
parent 6e7b82a4bb
commit 577287728a
1 changed files with 1 additions and 0 deletions
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src/runtime/sys_linux_arm.s
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@ -360,6 +360,7 @@ finish:
MOVW R1, m_vdsoPC(R5)
MOVW R0, sec_lo+0(FP)
MOVW $0, R1
MOVW R1, sec_hi+4(FP)
MOVW R2, nsec+8(FP)
RET