var stw worldStop
	if all {
		stw = stopTheWorld(stwAllGoroutinesStack)
	}

	n := 0
	if len(buf) > 0 {
		gp := getg()
		sp := getcallersp()
		pc := getcallerpc()
		systemstack(func() {
			g0 := getg()
			// Force traceback=1 to override GOTRACEBACK setting,
			// so that Stack's results are consistent.
			// GOTRACEBACK is only about crash dumps.

	}
	return res
}

// Helpers for Go. Must be NOSPLIT, must only call NOSPLIT functions, and must not block.

//go:nosplit
func acquirem() *m {
	gp := getg()
	gp.m.locks++
	return gp.m
}

//go:nosplit
func releasem(mp *m) {
	gp := getg()
	mp.locks--
	if mp.locks == 0 && gp.preempt {
		// restore the preemption request in case we've cleared it in newstack
		gp.stackguard0 = stackPreempt
	}
}

		throw("cgocall unavailable")
	}

	if fn == nil {
		throw("cgocall nil")
	}

	if raceenabled {
		racereleasemerge(unsafe.Pointer(&racecgosync))
	}

	mp := getg().m
	mp.ncgocall++

	// Reset traceback.
	mp.cgoCallers[0] = 0

	// Announce we are entering a system call
	// so that the scheduler knows to create another
	// M to run goroutines while we are in the

	//
	// If the scavenger isn't already awake, wake it up. There's
	// definitely work for it to do at this point.
	scavenger.wake()

	nextMarkBitArenaEpoch()
}

func bgsweep(c chan int) {
	sweep.g = getg()

	lockInit(&sweep.lock, lockRankSweep)
	lock(&sweep.lock)
	sweep.parked = true
	c <- 1
	goparkunlock(&sweep.lock, waitReasonGCSweepWait, traceBlockGCSweep, 1)

	for {

// A gcWork provides the interface to produce and consume work for the
// garbage collector.
//
// A gcWork can be used on the stack as follows:
//
//	(preemption must be disabled)
//	gcw := &getg().m.p.ptr().gcw
//	.. call gcw.put() to produce and gcw.tryGet() to consume ..
//
// It's important that any use of gcWork during the mark phase prevent
// the garbage collector from transitioning to mark termination since

	checkFunc(f.f)
}

// Test to make sure G register is never reloaded from spill (spill of G is okay)
// See #25504
func TestNoGetgLoadReg(t *testing.T) {
	/*
		Original:
		func fff3(i int) *g {
			gee := getg()
			if i == 0 {
				fff()
			}
			return gee // here
		}
	*/
	c := testConfigARM64(t)
	f := c.Fun("b1",
		Bloc("b1",
			Valu("v1", OpInitMem, types.TypeMem, 0, nil),

// directly schedule the waiter. The context switch is unavoidable in
// the signal case.
//
//go:systemstack
func suspendG(gp *g) suspendGState {
	if mp := getg().m; mp.curg != nil && readgstatus(mp.curg) == _Grunning {
		// Since we're on the system stack of this M, the user
		// G is stuck at an unsafe point. If another goroutine
		// were to try to preempt m.curg, it could deadlock.

	if raceenabled {
		// g0 doesn't have a race context. Borrow the user G's.
		if getg().racectx != 0 {
			throw("expected racectx == 0")
		}
		getg().racectx = getg().m.curg.racectx
		// (This defer should get open-coded, which is safe on
		// the system stack.)
		defer func() { getg().racectx = 0 }()
	}

	// This function must not allocate while holding trace.lock:

	// calls back into Go.
	c := &getg().m.winsyscall
	c.fn = fn
	c.n = uintptr(len(args))
	if c.n != 0 {
		c.args = uintptr(noescape(unsafe.Pointer(&args[0])))
	}
	cgocall(asmstdcallAddr, unsafe.Pointer(c))
	// cgocall may reschedule us on to a different M,
	// but it copies the return values into the new M's
	// so we can read them from there.
	c = &getg().m.winsyscall
	return c.r1, c.r2, c.err

	}
	if t.NumResults() == 1 {
		n.SetType(l.Type().Result(0).Type)

		if n.Op() == ir.OCALLFUNC && n.Fun.Op() == ir.ONAME {
			if sym := n.Fun.(*ir.Name).Sym(); types.RuntimeSymName(sym) == "getg" {
				// Emit code for runtime.getg() directly instead of calling function.
				// Most such rewrites (for example the similar one for math.Sqrt) should be done in walk,