How are data passed from JCL parm to assembler program. And how is data passed

How are data passed from JCL parm to assembler program. And
how is data passed from a calling program to an assembler
called program.

Question Posted / guest

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How are data passed from JCL parm to assembler program. And how is data passed from a calling prog..

Answer / joseph louis pargas

By convention, general purpose register 1 will have the
address of the parameter list. The list will be a list of
pointers (addresses) to individual parameters. The CALL
macro does this, but you can bypass the CALL macro and be
creative on how you set up the parameter list. Don't forget
the parameter must be on a fullword boundary.

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6 Yes

1 No

How are data passed from JCL parm to assembler program. And how is data passed from a calling prog..

Answer / mike m

- JCL PARM

//SAMPPROG EXEC PGM=XXXXXXXX,PARM='XXXXXXXX......'

CONTAINS A PARM FIELD WITH UP TO 100 BYTES OF DATA IN IT.
THE PROGRAM BY DESIGN PICKUPS UP A POINTER TO THE DATA AND
THE DATA LEN. REG 1 HAS WHAT YOU NEED TO EXTRAPOLATE ALL OF
THIS.

- PASS DATA TO CALLED PROGRAM

IN THIS CASE, CALLER IS AN ALC PROGRAM PASSING 2 FIELDS TO
SUBROUTINE NAMED SUBROUT1. THE PASSED FIELDS WILL HAVE BEEN
PRIMED PRIOR TO THE "CALL"

CALL SUBROUT1(FIELDA,FIELDB)
.
.
.
FIELDA DS CL8
FIELDB DS CL8

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8 Yes

5 No

How are data passed from JCL parm to assembler program. And how is data passed from a calling prog..

Answer / guest

Calling programs are used to pass the parameters to pass
the value. usually R1 is the parameter address which is
used between the programs.

Is This Answer Correct ?

1 Yes

0 No

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