mp.libcall.args = uintptr(unsafe.Pointer(&mp.scratch))
	asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&mp.libcall))
	sem = (*semt)(unsafe.Pointer(mp.libcall.r1))
	if sem_init(sem, 0, 0) != 0 {
		throw("sem_init")
	}
	mp.waitsema = uintptr(unsafe.Pointer(sem))
}

//go:nosplit
func semasleep(ns int64) int32 {
	mp := getg().m
	if ns >= 0 {
		mp.ts.tv_sec = ns / 1000000000

	// Call libc's malloc rather than malloc. This will
	// allocate space on the C heap. We can't call mallocgc
	// here because it could cause a deadlock.
	sem = (*semt)(malloc(unsafe.Sizeof(*sem)))
	if sem_init(sem, 0, 0) != 0 {
		throw("sem_init")
	}
	mp.waitsema = uintptr(unsafe.Pointer(sem))
}

//go:nosplit
func semasleep(ns int64) int32 {
	mp := getg().m
	if ns >= 0 {
		var ts timespec