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
`r1`	262, the syscall number
`r2`	clockid_t which_clock
`r3`	int flags
`r4`	const struct __kernel_timespec *rqtp
`r5`	struct __kernel_timespec *rmtp
`r2`	the return value

Then run svc 0 to enter the kernel.

Same syscall on other architectures