Suppose the return address is loaded into R14 instead of a link type
instruction and R14 points to the first byte of a page....
In addition, when a program is attached, R14 usually points to CVTEXIT (SVC 3)
and the halfword before it is some vector value.
Keith Moe
BMC Software, Inc.
On Tuesday, August 11, 2020, 03:01:48 PM PDT, Charles Mills
<[email protected]> wrote:
> Too clever by far.
Truer words have never been spoken.
Charles
-----Original Message-----
From: IBM Mainframe Assembler List [mailto:[email protected]]
On Behalf Of Farley, Peter x23353
Sent: Tuesday, August 11, 2020 11:33 AM
To: [email protected]
Subject: Re: how to return?
Too clever by far. Offhand I don't think I would give it a passing grade in
a code review.
I can't immediately think of situations where it might fail, but I have the
sneaking suspicion that what I don't know (and that's a lot) could bite that
code.
Peter
-----Original Message-----
From: IBM Mainframe Assembler List <[email protected]> On
Behalf Of Ed Jaffe
Sent: Tuesday, August 11, 2020 2:15 PM
To: [email protected]
Subject: Re: how to return?
Clever...
On 8/11/2020 10:57 AM, Tony Thigpen wrote:
> I came across the following code today. The program can either be
> called by JCL or from either an HLL or assembler program. While I
> included some extra code for clarity, the code I am asking for
> comments on is the code that 'fixes' R14 so that a BSM can be used
> instead of a BR. I just thought I would ask what others think about
> this method.
