Hi, Please assist a poor soul into finding a way to debug SVC (supervisor call interrupt) handlers. I am still learning HLASM and debugging stuff on 390, so I am not really aware of the tools, hooks, methods and concepts available. So far I have managed to get ASMIDF running nicely, relinked with AC=1, APF-authorized, so as far as normal programs are concerned I can trace and inspect execution nicely. What I need is a way to follow-up on SVC calls, a way to hook into the handler and examine the execution of the call. I use a test/development zPDT z/OS 1.11 system, I can mess with it, kill it, etc. The real hardware is also around, but I am not that keen to kill that. Thanks! Costin
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