syscall.sh / xtensa / rt_sigtimedwait_time64

rt_sigtimedwait_time64

synchronously wait for queued signals

sys_rt_sigtimedwait(const sigset_t *uthese, siginfo_t *uinfo, const struct __kernel_timespec *uts, size_t sigsetsize)

register	value
`a2`	421, the syscall number
`a6`	const sigset_t *uthese
`a3`	siginfo_t *uinfo
`a4`	const struct __kernel_timespec *uts
`a5`	size_t sigsetsize
`a2`	the return value

Then run syscall to enter the kernel.

Same syscall on other architectures