That makes sense.
I guess that R15 still contained some 'garbage' left by the OS when it
initially loaded and branched to the program.
Tony Thigpen
Binyamin Dissen wrote on 3/10/21 12:50 AM:
If all top-halfs are zero, it skips them.
On Wed, 10 Mar 2021 00:28:07 -0500 Tony Thigpen <t...@vse2pdf.com> wrote:
:>I just noticed something I had not noticed before.
:>
:>I have a little test program that I am doing all sorts of things to see
:>how things work. So, of course, I am crashing it a lot. Sometimes even
:>on purpose using DC x'0000' instructions.
:>
:>What I have noticed is that the log shows the registers differently
:>sometimes. For example:
:>
:>SYSTEM COMPLETION CODE=0C1 REASON CODE=00000001
:> TIME=00.40.10 SEQ=00137 CPU=0000 ASID=0034
:> PSW AT TIME OF ERROR 078D0000 00008CD8 ILC 2 INTC 01
:> ACTIVE LOAD MODULE ADDRESS=00007000 OFFSET=00001CD8
:> NAME=COPYTPX
:> DATA AT PSW 00008CD2 - 4710B03A 00004D10 B0308F00
:> GR 0: 00000000_00009018 1: 00000000_0000901F
:> 2: 00000000_00007604 3: 00000000_0000AFFC
:> 4: 00000000_00009018 5: 00000000_0000901F
:> 6: 00000000_00040000 7: 00000000_FD000000
:> 8: 00000000_00009010 9: 00000000_80008036
:> A: 00000000_0000AFE0 B: 00000000_00008CB0
:> C: 00000000_40008010 D: 00000000_00008E98
:> E: 00000000_000092A8 F: 7FFAEA00_00008CB0
:>vs. the following:
:>
:>SYSTEM COMPLETION CODE=0C1 REASON CODE=00000001
:> TIME=00.39.24 SEQ=00136 CPU=0000 ASID=0034
:> PSW AT TIME OF ERROR 078D0000 00008CE4 ILC 2 INTC 01
:> ACTIVE LOAD MODULE ADDRESS=00007000 OFFSET=00001CE4
:> NAME=COPYTPX
:> DATA AT PSW 00008CDE - 8DE00A13 000047F0 B0A29680
:> GR 0: 00000950 1: 009C36B0
:> 2: 00007604 3: 0000AFFC
:> 4: 00009018 5: 0000901F
:> 6: 00040000 7: FD000000
:> 8: 00009010 9: 80008036
:> A: 0000AFE0 B: 00008CB0
:> C: 40008010 D: 00008E98
:> E: 000092A8 F: 00000000
:>
:>The only difference is that 64 bit regs are shown if I have not done an
:>OPEN macro while 31 bit registers are shown if I have issued an OPEN macro.
:>Test code snipit:
:>
:>*DC X'0000'
:> OPEN (SNAPDCB,(OUTPUT))
:> DC X'0000'
:>
:>The program in question is assembled AMODE=24,RMODE=24.
:>
:>OK, whats up with this?
--
Binyamin Dissen <bdis...@dissensoftware.com>
http://www.dissensoftware.com
Director, Dissen Software, Bar & Grill - Israel
Should you use the mailblocks package and expect a response from me,
you should preauthorize the dissensoftware.com domain.
I very rarely bother responding to challenge/response systems,
especially those from irresponsible companies.
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