HLASM Toolkit Feature Interactive Debug Facility User's Guide
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Looking at the address

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

Unless the first token of the argument string passed to the exit routine is "PFKEY", it will also be passed the address at which the event occurred. The argument string passed to the exit routine can be parsed with the following REXX instruction: 
Parse Upper Arg reason hexvalue . '(' csect ')' symbolic
Assume that a breakpoint occurs at label LOOP, which is at location X'2000E' in CSECT ALLOPEN, which begins at X'20000'. After this Parse instruction, the following variables are set:
REASON
BREAK
HEXVALUE
0002000E
CSECT
ALLOPEN
SYMBOLIC
ALLOPEN+14
Note: If the address is outside the target programs defined to IDF, the code section (CSECT) name is omitted and the symbolic name is a second hexadecimal value.
Parent topic: The IDF exit routine

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