Thanks; that's exactly what I needed to know. I apologize for thinking
of a different interpretation of "R2 must be zero".
Regards, Gary
Gary Weinhold
Senior Application Architect
DATAKINETICS | Data Performance & Optimization
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On 2015-12-16 00:22, Jim Mulder wrote:
I decided to start looking at the BSA instruction as part of a solution
to accessing memory in various keys using key 0.
I'm running a reentrant program from an authorized library (so it's
loaded in key 0) in problem state; I get a S0D3 abend, which I assume is
PIC 13 Special Operation exception, executing the following code:
LARL R6,BSA_RA Address for reduced authority routine
OILH R6,X'8000' Mark address 31-bit
LLILF R5,X'00C00090' preserve PKM, switch to Key 9
BSA R5,R6 Off to Reduced Authority routine
BSA_BA DS 0H Return to base authority
...
BSA_RA DS 0H Reduced authority routine
SR R6,R6 zero R6 in order to return
BSA R5,R6 Return to base authority
DC X'00DEAD00' If something unpredicted happens
I abend S0D3 in the BSA_RA routine on the BSA instruction. Until I had
the program in key 0 memory, I abended S0C4 as I entered the BSA_RA
routine at the SR R6,R6 instruction because the program was loaded in
key 8 fetch-protected memory.
The only reason listed for a Special Operation exception for BSA is if
R6 is non-zero when returning to base authority. And the dump shows it
is zero, and PSW is not updated with the address of BSA_BA.
Does anyone have any ideas of what probably obvious thing I'm missing
here?
Reconsider your interpretation of
"When BRANCH AND SET AUTHORITY is executed
in the reduced-authority state, as indicated by the
reduced-authority (RA) bit in the DUCT being one, R2
must be zero; otherwise, a special-operation exception
is recognized."
And then try
BSA R5,0 Return to base authority
Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY
