On 12/28/2011 3:17 PM, Steve Comstock wrote:
Now, let me just focus on the 23 semiprivileged instructions:
BAKR - Branch and Stack
[My follow up research will be: which of these
instructions allowed by z/OS are useful for
the application programmer? This may then
result in a new course. We'll see.]
The stack related group (BAKR, EREG, MSTA, ESTA, PR) is useful
for writing small, reentrant subroutines. I've also used a
BAKR 0,0 in a debug macro). If you're thinking of a new course,
or major addition, all the various subroutine linkages and save
area fun and games may qualify?
I've used some of the others, but only with authorized programs,
and not counting the PCs in IBM macros. IVSK may be useful for
home grown storage dumps?
Gerhard Postpischil
Bradford, VT
