RENT will (sometimes) catch violations of refreshability; it does not catch
violation of reentrancy other than (some) self modifying code. The OP's problem
is a reentrancy violation[1] that the assembler does not and cannot catch.
[1] Well, technically the two exits are different routines, but it's still a
failure
to serialize.
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
________________________________________
From: IBM Mainframe Discussion List <[email protected]> on behalf of
Jesse 1 Robinson <[email protected]>
Sent: Thursday, September 5, 2019 5:05 PM
To: [email protected]
Subject: Re: MPF Exit calling System REXX - S0C4 abend
System exits in general need to be reentrant. You should add the RENT option on
the ASM step as well to make sure you don't have any violations, which will
likely lead to S0C4 in otherwise sound code.
-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of
Sebastian Welton
Sent: Thursday, September 5, 2019 6:21 AM
To: [email protected]
Subject: (External):Re: MPF Exit calling System REXX - S0C4 abend
Definitely, see below (formatting is probably stuffed I'm afraid), compiled
using the standard ASMAC found in PROCLIB (no overriding ASMAOPT or other
parameters) and link with RENT, INCLUDE(ASMAOBJ) and SETCODE AC(0). I have now
found out where the original came from and am doing further research on it as
well, thanks.
Sebastian.
GENMSGTR TITLE 'GENMSGTR'
GENMSGTR CSECT
GENMSGTR RMODE 31
GENMSGTR AMODE ANY
R0 EQU 0 REGISTER 0
R1 EQU 1 REGISTER 1
R2 EQU 2 REGISTER 2
R3 EQU 3 REGISTER 3
R4 EQU 4 REGISTER 4
R5 EQU 5 REGISTER 5
R6 EQU 6 REGISTER 6
R7 EQU 7 REGISTER 7
R8 EQU 8 REGISTER 8
R9 EQU 9 REGISTER 9
R10 EQU 10 REGISTER 10
R11 EQU 11 REGISTER 11
R12 EQU 12 REGISTER 12
R13 EQU 13 REGISTER 13
R14 EQU 14 REGISTER 14
R15 EQU 15 REGISTER 15
STM R14,R12,12(R13) SAVE CALLERS REGS
USING GENMSGTR,R12 ADDRESSABILITY
LR R12,R15 SET BASE ADDRESS
LR R2,R1 SAVE PARAMETER REGISTER
L R1,=A(@DSECTE-@DSECT) CALCULATE STORAGE LENGTH
STORAGE OBTAIN,LENGTH=(R1) GET SOME VS
ST R1,8(,R13) FORWARD POINTER
ST R13,4(,R1) BACKWARD POINTER
LR R13,R1 POINT TO SAVE AREA
LR R1,R2 RESTORE PARAMETER REGISTER
B EYEBALLE SKIP CONSTANTS
EYEBALL DS 0H
DC C'=====> GENMSGTR D=&SYSDATE T=&SYSTIME ROB ===='
EYEBALLE DS 0H
USING @DSECT,R13 ADDRESSABILITY
SR R11,R11 CLEAR RETURN CODE
*
L R9,0(,R1) POINT TO CTXT
USING CTXT,R9 ADDRESSABILITY
L R8,CTXTTXPN WAS THERE A MESSAGE?
LTR R8,R8 SINGLE OR FIRST LINE WTO?
BNZ RETURN NO - EXIT
L R8,CTXTTXPJ POINT TO MAJOR
USING CTXTATTR,R8 ADDRESSABILITY
LA R7,@ARGLST POINT TO AXREXX ARG LIST
USING AXRARGLST,R7 ADDRESSABILITY
MVI @ARGLST,X'00'
MVC @ARGLST+1(AXRARGLST_LEN),@ARGLST
MVC AXRARGLSTID,=A(AXRARGLSTACRO) MOVE IN EYECATCHER
LA R1,AXRARGLSTCURVER VERSION 0
ST R1,AXRARGLSTVER SAVE VERSION
LA R1,1 SINGLE ARGUMENT
STH R1,AXRARGLSTNUMBER SAVE NUMBER OF ARGUMENTS
SLR R1,R1 CLEAR ERROR FLAG
STH R1,AXRARGLSTENTRYINERROR SAVE ERROR FLAG
ST R1,AXRARGLSTRSV2 SAVE RESERVED VALUE
LA R6,@ARG1 POINT TO ARGUMENT 1
USING AXRARGENTRY,R6 ADDRESSABILITY
MVI @ARG1,X'00'
MVC @ARG1+1(AXRARGENTRY_LEN),@ARG1
SLR R1,R1 CLEAR ADDRESS HIGH
ST R1,AXRARGADDRHIGH SAVE ADDRESS HIGH
LA R1,CTXTTMSG POINT TO WTO
ST R1,AXRARGADDRLOW SAVE ADDRESS
LA R1,L'CTXTTMSG POINT TO LENGTH OF WTO
ST R1,AXRARGLENGTH SAVE LENGTH
MVI AXRARGTYPE,AXRARGTYPECHAR SET ARGUMENT TYPE TO CHAR
OI AXRARGINPUTFLGS1,AXRARGINPUT FLAG INPUT ARGUMENT
AXREXX REQUEST=EXECUTE, X
SECURITY=BYAXRUSER, X
TSO=YES, X
SYNC=NO, X
NAME=VNAME, X
REXXARGS=@ARGLST, X
MF=(E,AXREXXL) INITIATE SYSTEM REXX PGM
LTR R15,R15 HOW DID WE DO?
BZ RETURN GREAT!
ABEND 1,REASON=(R0) ABEND REASON IS REXX REASON
LA R11,8 SET BAD RETURN CODE
*
RETURN DS 0H
LR R1,R13 POINT TO AREA TO BE FREED
L R13,4(,R13) RSTR CALLING PROGS SAVE AREA
L R0,=A(@DSECTE-@DSECT) GET STORAGE LENGTH
STORAGE RELEASE,LENGTH=(R0),ADDR=(R1) FREE UP THE VS
LR R15,R11 MOVE RETURN CODE TO R15
L R14,12(,R13) RESTORE CALLERS R14
LM R0,R12,20(R13) RESTORE CALLERS R0-R12
BR R14 RETURN TO CALLER
* STORAGE DEFINITIONS *
DS 0D
VNAME DC CL8'GENMSGRX NAME OF SYSTEM REXX PROGRAM
*
LTORG ,
* DUMMY SECTIONS *
@DSECT DSECT
@DSECTSA DS 18F
*------*
@ARGLST DS CL(AXRARGLST_LEN) ARGLIST LENGTH
@ARG1 DS CL(AXRARGENTRY_LEN) ARGENTRY LENGTH
RC DS 1F
*------*
@DSECTE EQU *
*
AXREXX MF=(L,AXREXXL)
*
AXRZARG DSECT=YES,AXRARGLST=YES,AXRARGENTRY=YES,AXRDIAG=YES
*
IEZVX100
*
END
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