BL	(R1)
	// Restore stack pointer.
	MOVD	8(RSP), R2
	MOVD	R2, RSP
	MOVD	R0, ret+16(FP)
	RET

// 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.

	XOR	R0, R0

	MOVD	asmcgocallSaveOffset(R1), R1	// Restore stack pointer.
#ifndef GOOS_aix
	MOVD	24(R1), R2
#endif
	// ret = R3
	RET

// 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.

	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 := "
	}

// very careful never to actually use the G, the TLS just can't be
// 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.

		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
	}

}

// sched.lock must be held.
func checkmcount() {
	assertLockHeld(&sched.lock)

	// Exclude extra M's, which are used for cgocallback from threads
	// created in C.
	//
	// The purpose of the SetMaxThreads limit is to avoid accidental fork
	// bomb from something like millions of goroutines blocking on system

		t.Skip("skipping for non-gc toolchain")
	}
	pc := make([]uintptr, 100)
	n := 0
	name := []string{
		"runtime.cgocallbackg1",
		"runtime.cgocallbackg",
		"runtime.cgocallback",
		"runtime.systemstack_switch",
		"runtime.cgocall",
		"test._Cfunc_callback",
		"test.nestedCall.func1",
		"test.nestedCall",
		"test.testCallbackCallers",
		"test.TestCallbackCallers",