syscall.sh / s390x / futex_wait

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
`r1`	455, the syscall number
`r2`	void *uaddr
`r3`	unsigned long val
`r4`	unsigned long mask
`r5`	unsigned int flags
`r6`	struct __kernel_timespec *timespec
`r7`	clockid_t clockid
`r2`	the return value

Then run svc 0 to enter the kernel.

Same syscall on other architectures