Chris Breemer ([log in to unmask]) wrote:
: Does anybody know if (and how) you can set a datatrace on an absolute address
: in xdb on the HP3000 ? We are using C, and want to set a datatrace on the
first
 
A few people pointed Chris to the system debugger, Debug/iX.
 
Yes, Debug/iX has data breakpoints (set via the datab command) ...
 
   *** but ***
 
they are *QUITE* dangerous to use.  (Because of this, the user must have
PM to be able to set data breakpoints.)
 
The basic rule (to avoid system failures) is to set a breakpoint
on a virtual address *ONLY* if it is on a page *BELOW* your SP.
Furthermore, be *SURE* that you won't exit out of your current
procedure(s) down to the point where the page with the data breakpoint
is now on (or above) the page with SP.
 
When I've faithfully observed that precaution, I've had no problem using
data breakpoints (even setting them on CM data addresses).
 
However...I've made mistakes and killed the system, too!
 
Stan Sieler
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