From fad2bbdc6a686a20174d2e73cf78f1659722bb39 Mon Sep 17 00:00:00 2001 From: Ian Lance Taylor Date: Thu, 7 Jul 2016 16:41:29 -0700 Subject: [PATCH] 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/24812 Reviewed-by: Brad Fitzpatrick --- src/runtime/sys_darwin_386.s | 5 +++++ src/runtime/sys_darwin_amd64.s | 7 ++++++- 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/src/runtime/sys_darwin_386.s b/src/runtime/sys_darwin_386.s index 9e45f8a002..83f4709f38 100644 --- a/src/runtime/sys_darwin_386.s +++ b/src/runtime/sys_darwin_386.s @@ -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 diff --git a/src/runtime/sys_darwin_amd64.s b/src/runtime/sys_darwin_amd64.s index 7b9cf6a3bc..e09b906ba5 100644 --- a/src/runtime/sys_darwin_amd64.s +++ b/src/runtime/sys_darwin_amd64.s @@ -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