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
`a2`	455, the syscall number
`a6`	void *uaddr
`a3`	unsigned long val
`a4`	unsigned long mask
`a5`	unsigned int flags
`a8`	struct __kernel_timespec *timespec
`a9`	clockid_t clockid
`a2`	the return value

Then run syscall to enter the kernel.

Same syscall on other architectures