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runtime: fix nanotime for macOS Sierra

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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/24812
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Ian Lance Taylor 2016-07-07 16:41:29 -07:00
parent 84bb9e62f0
commit fad2bbdc6a
2 changed files with 11 additions and 1 deletions
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5
src/runtime/sys_darwin_386.s
View File

@ -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

7
src/runtime/sys_darwin_amd64.s
View File

@ -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