How to pass data from kernel to user space in system call?

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hi,

I understand that the system call will use $eax to pass the return
value to user space application. But if we have more information
(data) to pass, are we going to pass a pointer stored in $eax also
instead of a simple value?

Is there any other ways to pass information from kernel space to user
space application?

Thanks,
Neo
--
I would remember that if researchers were not ambitious
probably today we haven't the technology we are using!

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