🚀 go-pugleaf

I am in need of some info about how the SPARC traps work.  Presently we
have only the Sun Assembly code manual, and some Sparc documentation on
order.  I am wanting to use the tagged arithmetic feature and the memory
alignment traps to deliberately provoke the hardware traps (to initiate
garbage collection, and so on).  

1. Is there some specific reference that tells me what has to be done in
   order to write and install trap handlers?

2. Does anyone have some code that I could look at to do this sort of
   thing?

3. On the Vax, the lowest virtual page 0 of a program's address space is
   protected, and this often helps catch NIL pointer references.  I have
   heard that it is not too difficult to set up the 80386 registers so that a
   portion of low memory is made protected, and similar trapping can be done
   there.  Is there anything similar on SPARC (i.e. a mechanism whereby I can
   protect some regions of the process address space against writing,
   reading, or both).   References or examples welcome.

Thanks
EP Wentworth - Dept. of Computer Science - Rhodes University - Grahamstown.
cspw@alpha.ru.ac.za