clock_nanosleep

high-resolution sleep with specifiable clock

sys_clock_nanosleep(clockid_t which_clock, int flags, const struct __kernel_timespec *rqtp, struct __kernel_timespec *rmtp)

register	value
`x8`	115, the syscall number
`x0`	clockid_t which_clock
`x1`	int flags
`x2`	const struct __kernel_timespec *rqtp
`x3`	struct __kernel_timespec *rmtp
`x0`	the return value

Then run svc #0 to enter the kernel.

Same syscall on other architectures