The PC instruction is a replacement for SVC. Both instructions exist solely
to run authorized programs in other address spaces. PC was designed to fix and
simplify many of those problems with SVC. Some of the important problems
addressed (not all):
1. 256 static defined SVC's replaced by dynamically assigned PC token that are
fully under the products control without sysprog intervention (e.g. SVC table
def).
2. SVC SRB replaced by simple xmem implementation that occurs automatically.
3. Abend recovery easily implemented in PC routine.
4. Eliminates the need for programs in CSA or SQA.
PC routines should run as fast (probably faster) as an SVC. If I remember
correctly, PC's don't have an RB and use the linkage stack instead.
Jon.
On Wednesday, August 28, 2019, 09:23:28 AM PDT, Seymour J Metz
<[email protected]> wrote:
I doubt that PC was ever intended as a replacement for, e.g., BASR. How does
its performance stack up against SVC?
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