Hi Charles,
Is that of interest for you ?
https://www.ibm.com/docs/en/zos/3.1.0?topic=conventions-extra-performance-linkage-xplink-call-linkage
and examples :
https://www.ibm.com/docs/en/zos/3.1.0?topic=SSLTBW_3.1.0/com.ibm.zos.v3r1.ceev100/cee1v269.html
HTH
René
Le lundi 21 avril 2025 à 20:43:22 UTC+2, Charles Mills <[email protected]>
a écrit :
Jonathon, yes there is a lot in the LE PG. But it's not really what you
would want if you were writing a program.
Yes, the stack frame layout is documented. But how do I define variables in
the DSA? How do I address it?
Yes, the register "conventions" are "documented." What does "preserved"
mean? Does that mean that I am supposed to preserve it?
I think it is classic documentation in that if you already know the answers,
then yup, sure enough, you can prove that the answer is right there on page
487. But if you are trying to learn to use it for the first time then -- at
least in my reading -- it is a jumble of random facts.
Or perhaps I asked the wrong question. Let me rephrase my question: Can you
recommend a tutorial on writing a C++ XPLINK subroutine in HLASM? (And if
not, then how DOES IBM expect customers to do so?)
Charles
-----Original Message-----
From: IBM Mainframe Assembler List <[email protected]> On
Behalf Of Jonathan Scott
Sent: Monday, April 21, 2025 9:49 AM
To: [email protected]
Subject: Re: XPLINK register conventions for called HLASM?
You said "a little bit" in the LE PG. From a quick glance, I'd say there is
"a lot" in the LE PG and that most of your questions are answered by what is
in there, especially in subtopics (stack frame, save area layout, register
usage) so it's difficult to know what else to add.
https://www.ibm.com/docs/en/zos/3.1.0?topic=environment-using-extra-performa
nce-linkage-xplink
Jonathan Scott
-----Original Message-----
From: IBM Mainframe Assembler List <[email protected]> On
Behalf Of Charles Mills
Sent: 21 April 2025 17:37
To: [email protected]
Subject: Re: XPLINK register conventions for called HLASM?
Really? No one knows this stuff? I don't feel so bad.
Charles
