semtimedop_time64

System V semaphore operations

sys_semtimedop(int semid, struct sembuf *sops, unsigned nsops, const struct __kernel_timespec *timeout)

register	value
`a2`	420, the syscall number
`a6`	int semid
`a3`	struct sembuf *sops
`a4`	unsigned nsops
`a5`	const struct __kernel_timespec *timeout
`a2`	the return value

Then run syscall to enter the kernel.

Same syscall on other architectures