HLASM Toolkit Feature Interactive Debug Facility User's Guide
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Invalid opcode breakpoints

HLASM Toolkit Feature Interactive Debug Facility User's Guide
GC26-8709-07

The advantages of not using SVC 97 for breakpoints are:
  1. You can install IDF in a TASKLIB or an ISPLLIB.
  2. You can more easily invoke IDF under ISPF.

This is useful if your LOGON PROC does not have a STEPLIB that you can write to.

The disadvantages of not using SVC 97 for breakpoints are:
  1. IDF cannot debug code that uses z/OS subtasking or sets up (E)STAE or (E)SPIE exits. (When IDF is invoked with the NOSVC97 option to test a program running under the LE/370 environment, the LE/370 NOSTAE and NOSPIE options must be used.)
  2. IDF cannot debug ISPF dialogs.
  3. DBREAK does not function for modules not in storage.
Parent topic: Breakpoint method selection (TSO)

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