// unset since we're in Go code.
GLOBL zeroTLS<>(SB),RODATA,$const_tlsSize
#endif

// func cgocallback(fn, frame unsafe.Pointer, ctxt uintptr)
// See cgocall.go for more details.
TEXT ·cgocallback(SB),NOSPLIT,$24-24
	NO_LOCAL_POINTERS

	// Skip cgocallbackg, just dropm when fn is nil, and frame is the saved g.
	// It is used to dropm while thread is exiting.
	MOVQ	fn+0(FP), AX
	CMPQ	AX, $0

	if len(paramnames) > 0 {
		arg = "uintptr(unsafe.Pointer(&p0))"
	} else if !void {
		arg = "uintptr(unsafe.Pointer(&r1))"
	}

	noCallback := p.noCallbacks[n.C]
	if noCallback {
		// disable cgocallback, will check it in runtime.
		fmt.Fprintf(fgo2, "\t_Cgo_no_callback(true)\n")
	}

	prefix := ""
	if n.AddError {
		prefix = "errno := "
	}

		u.finishInternal()
		return
	}

	// Compute function info flags.
	flag := f.flag
	if f.funcID == abi.FuncID_cgocallback {
		// cgocallback does write SP to switch from the g0 to the curg stack,
		// but it carefully arranges that during the transition BOTH stacks
		// have cgocallback frame valid for unwinding through.
		// So we don't need to exclude it with the other SP-writing functions.
		flag &^= abi.FuncFlagSPWrite
	}