🚀 go-pugleaf

I listened (read) with interest the recent discussion of tc_Switch in
the Task structure since I thought this would be ideal for writing my
own profiling code.

Now, a few weeks later, I realized that one thing wasn't mentioned:
details on the stack frame.  Is there some (easy) way to know where the
Program Counter is within the task?  How does this code get executed,
in User state or Supervisor state?  The RKM's don't seem to discuss
this much.

I have thought of another application, however.  Too often (and I do
mean "too" often :-) I find that my code goes into an infinite loop
while debugging it.  There's no way to stop this task, especially since
Xoper "kill" function locks up tasks under 2.0; I figured on checking
the SIG_CTRL_C bit at every inbound (maybe outbound?) task switch and
forcing the Program Counter to be a particular address using something
like setjmp/longjmp, but more crude -- just useful enough to stop the task.

Thanks.
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