// in the middle of our copy.
		gp.m.cgoCallersUse.Store(1)
		cgoCallers := *gp.m.cgoCallers
		gp.m.cgoCallers[0] = 0
		gp.m.cgoCallersUse.Store(0)

		printCgoTraceback(&cgoCallers)
	}

	if readgstatus(gp)&^_Gscan == _Gsyscall {
		// Override registers if blocked in system call.
		pc = gp.syscallpc
		sp = gp.syscallsp
		flags &^= unwindTrap
	}

		// Gccgo style hooks.
		fmt.Fprint(fgo2, "\n")
		conf.Fprint(fgo2, fset, d)
		fmt.Fprint(fgo2, " {\n")
		if !inProlog {
			fmt.Fprint(fgo2, "\tdefer syscall.CgocallDone()\n")
			fmt.Fprint(fgo2, "\tsyscall.Cgocall()\n")
		}
		if n.AddError {
			fmt.Fprint(fgo2, "\tsyscall.SetErrno(0)\n")
		}
		fmt.Fprint(fgo2, "\t")
		if !void {
			fmt.Fprint(fgo2, "r := ")
		}

	MOVQ	BX, DI		// DI = first argument in AMD64 ABI
	JMP	AX

// func asmcgocall(fn, arg unsafe.Pointer) int32
// Call fn(arg) on the scheduler stack,
// aligned appropriately for the gcc ABI.
// See cgocall.go for more details.
TEXT ·asmcgocall(SB),NOSPLIT,$0-20
	MOVQ	fn+0(FP), AX
	MOVQ	arg+8(FP), BX

	MOVQ	SP, DX

	// Figure out if we need to switch to m->g0 stack.

				// truncated profile than to crash the entire process.
				return
			}
			// saveg calls gentraceback, which may call cgo traceback functions.
			// The world is stopped, so it cannot use cgocall (which will be
			// blocked at exitsyscall). Do it on the system stack so it won't
			// call into the schedular (see traceback.go:cgoContextPCs).
			systemstack(func() { saveg(^uintptr(0), ^uintptr(0), gp1, &r[0], pcbuf) })

var defaultVetFlags = []string{
	// TODO(rsc): Decide which tests are enabled by default.
	// See golang.org/issue/18085.
	// "-asmdecl",
	// "-assign",
	"-atomic",
	"-bool",
	"-buildtags",
	// "-cgocall",
	// "-composites",
	// "-copylocks",
	"-directive",
	"-errorsas",
	// "-httpresponse",
	"-ifaceassert",
	// "-lostcancel",
	// "-methods",
	"-nilfunc",
	"-printf",
	// "-rangeloops",