Commit 53da5fd4 authored by Ian Lance Taylor's avatar Ian Lance Taylor Committed by Andrew Gerrand

[release-branch.go1.7] runtime: fix nanotime for macOS Sierra

In the beta version of the macOS Sierra (10.12) release, the
gettimeofday system call changed on x86. Previously it always returned
the time in the AX/DX registers. Now, if AX is returned as 0, it means
that the system call has stored the values into the memory pointed to by
the first argument, just as the libc gettimeofday function does. The
libc function handles both cases, and we need to do so as well.

Fixes #16272.

Change-Id: Ibe5ad50a2c5b125e92b5a4e787db4b5179f6b723
Reviewed-on: https://go-review.googlesource.com/24812Reviewed-by: default avatarBrad Fitzpatrick <bradfitz@golang.org>
Reviewed-on: https://go-review.googlesource.com/24755Reviewed-by: default avatarChris Broadfoot <cbro@golang.org>
parent a91416e7
......@@ -201,6 +201,11 @@ systime:
MOVL $0, 8(SP) // time zone pointer
MOVL $116, AX
INT $0x80
CMPL AX, $0
JNE inreg
MOVL 12(SP), AX
MOVL 16(SP), DX
inreg:
// sec is in AX, usec in DX
// convert to DX:AX nsec
MOVL DX, BX
......
......@@ -155,10 +155,15 @@ timeloop:
systime:
// Fall back to system call (usually first call in this thread).
MOVQ SP, DI // must be non-nil, unused
MOVQ SP, DI
MOVQ $0, SI
MOVL $(0x2000000+116), AX
SYSCALL
CMPQ AX, $0
JNE inreg
MOVQ 0(SP), AX
MOVL 8(SP), DX
inreg:
// sec is in AX, usec in DX
// return nsec in AX
IMULQ $1000000000, AX
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment