Multiple trace entries for a user event

A single user event appears in more than one trace entry if the PTRACE macro requests recording of more than 5 fullwords of trace data. For example, the following PTRACE macro requests recording of 11 fullwords of trace data:

PTRACE TYPE=USER3,REGS=(2,12),SAVEAREA=STANDARD

For this macro, system trace places three entries in the trace table. The entries contain the following:

The first entry contains the 5 fullwords of trace data in registers 2 through 6.
The second entry contains the 5 fullwords of trace data in registers 7 through 11.
The third entry contains the fullword of trace data in register 12.

If the program issuing the PTRACE macro is interrupted, the three trace entries may not be consecutive in the trace table. The multiple entries contain continuation information as the data for UNIQUE-1. The format of the continuation information is as follows:

   nnnn hhh

nnnn: The PTRACE identification count. This is a hexadecimal number assigned by PTRACE to all entries for one macro processing.
hhh: The byte offset, in hexadecimal, of the next byte of trace data, which is under UNIQUE-2. For the first entry, the offset is X'000'. For the second entry, the offset is X'014'. For the third entry, the offset is X'028'.

For example, Figure 1 shows three trace entries from the preceding PTRACE macro.

Figure 1. Example: Three trace entries from the PTRACE macro

 PR ASID TCB-ADDR  IDENT CD/D PSW----- ADDRESS- UNIQUE-1 UNIQUE-2 UNIQUE-3  PSACLHS- PSALOCAL PASD SASD TIMESTAMP-RECORD CP
                                                UNIQUE-4 UNIQUE-5 UNIQUE-6

 01 000C 00AFF090  USR3               81A007B6  003D 000 00000001 00000002                    000C 000C 9DAA507461CB3E02 CP
                                                00000003 00000004 00000005
 01 000C 00AFF090  USR3               81A007B6  003D 014 00000006 00000007                    000C 000C 9DAA507461CB3E02 CP
                                                00000008 00000009 0000000A
 01 000C 00AFF090  USR3               81A007B6  003D 028 0000000B                             000C 000C 9DAA507461CB3E02 CP