// it may hit stack split that is not expected here.
		if gp != nil {
			setg(nil)
		}
		badsignal(uintptr(sig), c)
		// Restore g
		if gp != nil {
			setg(gp)
		}
		return
	}

	setg(gp.m.gsignal)

	// If some non-Go code called sigaltstack, adjust.
	var gsignalStack gsignalStack

	if goarch.IsWasm == 0 && stringslite.HasPrefix(funcname(findfunc(pc)), "runtime.") {
		// Note: wasm can't tail call, so we can't get the original caller's pc.
		throw(msg)
	}
	// TODO: is this redundant? How could we be in malloc
	// but not in the runtime? runtime/internal/*, maybe?
	gp := getg()
	if gp != nil && gp.m != nil && gp.m.mallocing != 0 {
		throw(msg)
	}
}

	}
	if s := readgstatus(gp); s&_Gscan == 0 {
		// We don't own the stack via _Gscan. We could still
		// own it if this is our own user G and we're on the
		// system stack.
		if !(gp == getg().m.curg && getg() != getg().m.curg && s == _Grunning) {
			// We don't own the stack.
			throw("bad status in shrinkstack")
		}
	}
	if !isShrinkStackSafe(gp) {
		throw("shrinkstack at bad time")
	}

	// procid. We need this for asynchronous preemption and it's
	// useful in debuggers.
	getg().m.procid = uint64(gettid())
}

// Called from dropm to undo the effect of an minit.
//
//go:nosplit
func unminit() {
	unminitSignals()
	getg().m.procid = 0
}

// Called from exitm, but not from drop, to undo the effect of thread-owned

	// FreeBSD users are running a patched kernel. See issue #15658.
	if gp := getg(); !isarchive && !islibrary && gp.m == &m0 && gp == gp.m.g0 {
		st := stackt{ss_flags: _SS_DISABLE}
		sigaltstack(&st, nil)
	}

	minitSignals()
}

// Called from dropm to undo the effect of an minit.
//
//go:nosplit
func unminit() {
	unminitSignals()
	getg().m.procid = 0
}

func minit() {
	asmcgocall(unsafe.Pointer(abi.FuncPCABI0(miniterrno)), unsafe.Pointer(&libc____errno))

	minitSignals()

	getg().m.procid = uint64(pthread_self())
}

// Called from dropm to undo the effect of an minit.
func unminit() {
	unminitSignals()
	getg().m.procid = 0
}

// Called from exitm, but not from drop, to undo the effect of thread-owned

	if t.ts != nil {
		assertLockHeld(&t.ts.mu)
	}
	if raceenabled {
		// Note that we are running on a system stack,
		// so there is no chance of getg().m being reassigned
		// out from under us while this function executes.
		tsLocal := &getg().m.p.ptr().timers
		if tsLocal.raceCtx == 0 {
			tsLocal.raceCtx = racegostart(abi.FuncPCABIInternal((*timers).run) + sys.PCQuantum)
		}

		return int(osrev)
	}
	return 0
}

//go:nosplit
func semacreate(mp *m) {
}

//go:nosplit
func semasleep(ns int64) int32 {
	gp := getg()
	var deadline int64
	if ns >= 0 {
		deadline = nanotime() + ns
	}

	for {
		v := atomic.Load(&gp.m.waitsemacount)
		if v > 0 {
			if atomic.Cas(&gp.m.waitsemacount, v, v-1) {

func semacquire(addr *uint32) {
	semacquire1(addr, false, 0, 0, waitReasonSemacquire)
}

func semacquire1(addr *uint32, lifo bool, profile semaProfileFlags, skipframes int, reason waitReason) {
	gp := getg()
	if gp != gp.m.curg {
		throw("semacquire not on the G stack")
	}

	// Easy case.
	if cansemacquire(addr) {
		return
	}

	// Harder case:
	//	increment waiter count

}

func cgocallbackg1(fn, frame unsafe.Pointer, ctxt uintptr) {
	gp := getg()

	if gp.m.needextram || extraMWaiters.Load() > 0 {
		gp.m.needextram = false
		systemstack(newextram)
	}

	if ctxt != 0 {
		s := append(gp.cgoCtxt, ctxt)

		// Now we need to set gp.cgoCtxt = s, but we could get
		// a SIGPROF signal while manipulating the slice, and