Ticket #52041: sierra-clock_gettime copy.patch

src/runtime/sys_darwin_386.s

@@ -182 +182 @@
 
 systime:
         // Fall back to system call (usually first call in this thread)
-        LEAL    12(SP), AX      // must be non-nil, unused
+        LEAL    16(SP), AX      // must be non-nil, unused
         MOVL    AX, 4(SP)
         MOVL    $0, 8(SP)       // time zone pointer
+        MOVL    $0, 12(SP)      // required as of Sierra; Issue 16570
         MOVL    $116, AX
         INT     $0x80
+        CMPL    AX, $0
+        JNE     inreg
+        MOVL    16(SP), AX
+        MOVL    20(SP), DX
+inreg:
         // sec is in AX, usec in DX
         // convert to DX:AX nsec
         MOVL    DX, BX

src/runtime/sys_darwin_amd64.s

@@ -141 +141 @@
 
 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
+        MOVQ    $0, DX // required as of Sierra; Issue 16570
         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