IBM: EPLIST

Programming Interface Information: This page documents intended Programming
Interfaces that allow the customer to write programs to obtain the services of VM/ESA.

EPLIST

Prolog

Control Block Contents

EPLIST DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

EPLIST Prolog
 Name       : EPLIST
 Description: Extended Parameter List DSECT
 DSECT      : EPLIST
 Function   : EPLIST maps the extended parameter list passed
              between modules. EPLIST is found in the EPLIST
              macro.

EPLIST Control Block Content


EPLIST DSECT
Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      EPLIST         Extended Parameter List DSECT
0000    0 Address      4 EPLCMD         ADDRESS OF COMMAND TOKEN.
0004    4 Address      4 EPLARGBG       ADDR OF BEGINNING OF ARGUMENTS.
0008    8 Address      4 EPLARGND       ADDR OF END OF ARGUMENTS.
000C   12 Address      4 EPLUWORD       USER WORD
          00000010       EPL4LNBY       *-EPLIST 4 WORD HEADER LENGTH IN
                                        BYTES
          00000002       EPL4LNDW       (*-EPLIST+7)/8 4 WORD HEADER
                                        LENGTH IN DWORDS
0010   16 Address      4 EPARGLST       ADDRESS OF FUNCTION ARGUMENT
                                        LIST.
0014   20 Address      4 EPFUNRET       ADDRESS FOR RETURN OF FUNCTION
                                        DATA.
          00000018       EPL6LNBY       *-EPLIST 6 WORD HEADER LENGTH IN
                                        BYTES
          00000003       EPL6LNDW       (*-EPLIST+7)/8 6 WORD HEADER
                                        LENGTH IN DWORDS
0018   24 Address      4 * (2)          PADDING (FOR USE WITH SCAN MACRO)
0020   32 Character    8 EPLSCANT (0)   BEGINNING OF TOKENIZED PLIST
                                        BUILT BY SCAN MACRO.
          0000000C       EPLRSRVD       EPLUWORD,4,C'A' (OLD NAME, FOR
                                        COMPATIBILITY)
     THE EXTENDED PLIST FLAGS INDICATE THE PRESENCE OF AN EXTENDED PLIST IN
     REGISTER 0. THE HIGH ORDER BYTE OF REGISTER 1 WILL CONTAIN EITHER
     EPLCMDFL OR EPLFNCFL TO INDICATE THE EXTENDED PLIST IS AVAILABLE. ONLY
     THE FIRST 4 WORDS OF THE EXTENDED PLIST ARE AVAILABLE WITH THESE CODES.
     IF THE HIGH ORDER BYTE OF REGISTER 1 CONTAINS EPFUNSUB, THEN THE
     INVOCATION IS AN EXTERNAL FUNCTION/SUBROUTINE CALL FROM REX. WITH THIS
     PLIST, ALL 6 WORDS OF THE PLIST ARE AVAILABLE. WORD 5 POINTS TO A LIST
     OF DOUBLE WORD ADLENS (ADDRESS-LENGTH PAIRS) WHICH DESCRIBE THE
     ARGUMENTS TO THE ROUTINE (EPARGLST). WORD 6 (EPFUNRET) IS THE LOCATION
     FOR THE CALLED ROUTINE TO STORE THE ADDRESS OF AN EVALBLOK TO RETURN
     DATA TO THE CALLING PROGRAM.
          .... 1.11      EPLCMDFL       X'0B' EXTENDED PLIST AVAILABLE
                                        FLAG.
          .... ...1      EPLFNCFL       X'01' EXTENDED PLIST AVAILABLE
                                        FLAG.
          .... .1.1      EPFUNSUB       X'05' EXTERNAL FUNCTION PLIST
                                        AVAILABLE
     FLAG DEFINITIONS. EXCEPT AS NOTED, ONLY THE FIRST FOUR WORDS OF THE
     EXTENDED PLIST ARE AVAILABLE. EPLIST FLAG VALUE AVAIL? MEANING
          .... ....      EPLFPROG       X'00' N PROGRAM
          .... ...1      EPLFCMND       X'01' Y ADDRESS COMMAND
          .... ..1.      EPLFSBCM       X'02' Y SUBCOM
          .... ..11      EPLFNNUE       X'03' Y NO NUCEXT, EXTENDED
          .... .1..      EPLFNNUT       X'04' N NO NUCEXT, TOKENIZED
          .... .1.1      EPLFRXFN       X'05' Y REXX EXTERNAL FUNCTION, 6
                                        WORD EXTENDED PLIST PRESENT
          .... .11.      EPLFIMMD       X'06' Y IMMEDIATE COMMAND
          .... 1.11      EPLFSRCH       X'0B' Y COMMAND SEARCH
          ...1 ....      EPLFEXEC       X'10' N INVOKED BY BPX1EXC
          1111 111.      EPLFENDC       X'FE' N END OF COMMAND
          1111 1111      EPLFABEN       X'FF' N ABEND OR NUCXDROP

EPLIST Storage Layout

*** EPLIST - Extended Parameter List DSECT
*
*     +---------------------------+---------------------------+
*   0 |          EPLCMD           |         EPLARGBG          |
*     +---------------------------+---------------------------+
*   8 |         EPLARGND          |         EPLUWORD          |
*     +---------------------------+---------------------------+
*  10 |         EPARGLST          |         EPFUNRET          |
*     +---------------------------+---------------------------+
*  18 |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  20 |                                                       |
*     =                       EPLSCANT                        =
*     |                                                       |
*     +-------------------------------------------------------+
*
*** EPLIST - Extended Parameter List DSECT