DEBUGOPT parameter

Debugging options

Summary

Default value

0

Parameter type

System

Where set

User 0 parameter line

Related products

All

Introduced

Model 204 V7.4 or earlier

Description

Control of the debugging options within Model 204.

Valid settings of DEBUGOPT, which can be summed, are as follows:

Setting	Meaning
X'01'	Implements GTRACE (GTF) for module mapping and subtask-to-maintask switching.
X'02'	Server swapping debugging facility. If this option is specified, evaluations run within a special key restricted debug server instead of the normal server. This option may be used to find server swapping errors. This option causes increased CPU overhead. NOTE: This option is incompatible with parameter SERV4G. If both are set, an abendSDC2 will occur since boundaries are not page aligned.
X'04'	Force debugging server swaps. Server swaps may be swappable or non-swappable. Normally, a swappable server will remain within the running area unless the area is requested by a waiting user. If this option is specified, every non-swappable server swap will be forced into a new debug server, no matter whether it is requested or not. This option causes significant CPU overhead. NOTE: If X'02' is off, X'04' is automatically turned off and disabled.
X'08'	Server protection option. This option turns on key protection for all servers.This option causes significant CPU overhead.
X'10'	Komm protection option. This option turns on key protection for all user Komm areas.
X'20'	BTB disk buffer page sentinels. This option adds a key protected storage page between each BTB disk buffer. This may significantly increase the storage required for BTB buffers. ATB buffers are uneffected by this bit.
X'40'	Use normal access paths for ATB CCATEMP. This option disables shortcut pathing when accessing ATB CCATEMP.
X'80'	Dirty 64-bit registers. For each quad being executed, set the high order word of each register to high values. This option is used to detect invalid 64-bit addressing within Model 204 source code.