Peter Relson wrote:
<snip>
If I didn't have to save/restore R15 and R1, then I could totally get away
with something very close to standard linkage
</snip>
Huh? You can precisely use standard linkage. Standard linkage starts with
"save all". It does not require "restore all".
If a service (or protocol) does not specifically tell you to preserve
registers 15,0,1 then you do not to do so.
Thanks Peter!
My concern was the words "Unless otherwise defined by the individual
interface"
in the z/OS MVS Programming Assembler Services Guide where it describes the
standard linkage; and how that meshes with this text in the ETXD option
description
ATTACH and ATTACHX in the z/OS MVS Program: Authorized Assembler
Services Reference:
"The exit routine is responsible for saving and restoring the registers".
That would seem to indicate that the ETXR is responsible for saving
_and_ restoring?
Or, is it open to interpretation? If it's open to interpretation - just
what should that
interpretation be? Does "the registers" mean "all the registers" or
just the standard ones?
Does this sentence fall under the "Unless otherwise defined by the
individual interface"
clause, or is it simply a reminder to follow standard saving/restoring
practices?
Some simple specification or improved wording in the doc might be a good
idea... it seems unclear to me...
- Thanks -
- Dave Rivers -
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