How to detect the page read/write fault ?

["Yung-Chang Chiu" <qson@xxxxxxxxxxxxxxxxxxx>]

On the x86 machine, i can use the below program to detect read or write fault.
write_fault=uap->uc_mcontext.gregs[REG_ERR]&4;

but it don't work on AMD64 machine.

I have been search on internet, but there is no answer for AMD64.
Anybody can tell me how to do?

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