This is probably part of Start Interpretive Execution (assuming that's
still used). VM used to be based on running users in problem state so
every privop is intercepted , but SIE allows more selective trapping of
which ops are intercepted especially for operating systems like z/OS. I
think VM was trapping STCK during the Y2K testing era as an example of
non-privileged ops.
On 2019-03-28 4:42 p.m., Charles Mills wrote:
Is this one of those situations that is controlled by a control register bit?
VM does not interpret every instruction like Hercules. It must be getting an
interrupt on STFLE or whatever.
Charles
Gary Weinhold
Senior Application Architect
DATAKINETICS | Data Performance & Optimization
Phone +1.613.523.5500 x216
Email: [email protected]
Visit us online at www.DKL.com
E-mail Notification: The information contained in this email and any attachments is confidential and may be subject to copyright or other intellectual property protection. If you are not the intended recipient, you are not authorized to use or disclose this information, and we request that you notify us by reply mail or telephone and delete the original message from your mail system.
-----Original Message-----
From: IBM Mainframe Assembler List [mailto:[email protected]] On
Behalf Of Tom Marchant
Sent: Thursday, March 28, 2019 11:48 AM
To: [email protected]
Subject: Re: Determing the Presence of an Instruction
On Thu, 28 Mar 2019 09:56:23 -0700, Charles Mills wrote:
VM does a fair amount of "interception" and instruction simulation in any event.
For privileged instructions, yes. In this case, something has to happen for
non-privileged instructions too.
