futex_wait

sys_futex_wait(void *uaddr, unsigned long val, unsigned long mask, unsigned int flags, struct __kernel_timespec *timespec, clockid_t clockid)

register	value
`v0`	4455, the syscall number
`a0`	void *uaddr
`a1`	unsigned long val
`a2`	unsigned long mask
`a3`	unsigned int flags
`sp+16`	struct __kernel_timespec *timespec
`sp+20`	clockid_t clockid
`v0`	the return value

Then run syscall to enter the kernel.

Same syscall on other architectures