{AMULW, ydivl, Pe, opBytes{0xf7, 04}},
	{ANEGB, yscond, Pb, opBytes{0xf6, 03}},
	{ANEGL, yscond, Px, opBytes{0xf7, 03}},
	{ANEGQ, yscond, Pw, opBytes{0xf7, 03}},
	{ANEGW, yscond, Pe, opBytes{0xf7, 03}},
	{obj.ANOP, ynop, Px, opBytes{0, 0}},
	{ANOTB, yscond, Pb, opBytes{0xf6, 02}},
	{ANOTL, yscond, Px, opBytes{0xf7, 02}}, // TODO(rsc): yscond is wrong here.
	{ANOTQ, yscond, Pw, opBytes{0xf7, 02}},

	SYS___CLOGL_B                       = 0xA01 // 2561
	SYS___CLOGL_H                       = 0xA02 // 2562
	SYS_CONJ                            = 0xA03 // 2563
	SYS___CONJ_B                        = 0xA04 // 2564
	SYS___CONJ_H                        = 0xA05 // 2565
	SYS_CONJF                           = 0xA06 // 2566
	SYS___CONJF_B                       = 0xA07 // 2567

			anonymizeAddr(&localSysConfig)
			healthInfo.Sys.SysConfig = append(healthInfo.Sys.SysConfig, localSysConfig)
			partialWrite(healthInfo)

			peerSysConfig := globalNotificationSys.GetSysConfig(healthCtx)
			for _, sc := range peerSysConfig {
				anonymizeAddr(&sc)
				healthInfo.Sys.SysConfig = append(healthInfo.Sys.SysConfig, sc)
			}
			partialWrite(healthInfo)
		}
	}

var needSysmonWorkaround bool = false

// haveSysmon indicates whether there is sysmon thread support.
//
// No threads on wasm yet, so no sysmon.
const haveSysmon = GOARCH != "wasm"

// Always runs without a P, so write barriers are not allowed.
//
//go:nowritebarrierrec
func sysmon() {
	lock(&sched.lock)
	sched.nmsys++
	checkdead()
	unlock(&sched.lock)

	testAutomaticHTTP2_Serve(t, &tls.Config{NextProtos: []string{"h2"}}, true)
}

func testAutomaticHTTP2_Serve(t *testing.T, tlsConf *tls.Config, wantH2 bool) {
	setParallel(t)
	defer afterTest(t)
	ln := newLocalListener(t)
	ln.Close() // immediately (not a defer!)
	var s Server
	s.TLSConfig = tlsConf
	if err := s.Serve(ln); err == nil {
		t.Fatal("expected an error")
	}
	gotH2 := s.TLSNextProto["h2"] != nil