[ros-kernel] NtContinue

[Royce Mitchell III]

Okay, I finally got NtContinue "working" last night. However, my 
null.sys SEH test results in an "infinite exception loop". I have 
attached my changes so far in case I can convince anybody to help me 
look at it...

(i386/exception.c:105) RegistrationFrame is 0xFFFFFFFF
(i386/exception.c:232) RtlpDispatchException(): Return 
ExceptionContinueExecution
(i386/exception.c:97) RtlpDispatchException()
Dumping exception registrations:
   No exception registrations exists.

This block above repeats ad nauseum... perhaps my changes and Hyperion's 
changes are conflicting?

BTW, this patch fixes NtContinue to return failure on Context==NULL, but 
not clobber EAX on success. It still needs to handle "invalid" Context 
pointers correctly, but otherwise it's finished.

I was going to commit it this morning, but since it's loop on exception, 
I'll wait until we can get that resolved.
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