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LINK.ASM
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LINKA CSECT
* LINK VERSION 2.1 BY CLYDE THOMAS ZUBER *
***********************************************************************
* *
* ATTR: RENT,REUS,REFR,AMODE(31),RMODE(ANY) *
* *
* PROGRAM DESCRIPTION: *
* *
* THIS SUBROUTINE ISSUES A LINK FOR HIGHER LEVEL LANGUAGE PROGRAMS. *
* *
* THIS ROUTINE HAS TWO ENTRY POINTS. LINKA IS FOR REGULAR OS/370 *
* LINKAGE. LINK IS FOR PL/I PROGRAMS USING PL/I OPTIMIZER R3.1, R4.0 *
* AND R5.0 CONVENTIONS. *
* *
* THE FIRST ARGUMENT IS AN EIGHT CHARACTER FIELD WITH THE ENTRY POINT *
* NAME IN IT. THE USER MUST MAKE SURE THE NAME IS EIGHT BYTES LONG *
* PADDED WITH BLANKS. *
* *
* THE SECOND ARGUMENT IS THE PARM FIELD WHOSE ADDRESS WILL BE LOADED *
* INTO REGISTER ONE AS THE PARAMETER TO THE PROGRAM TO BE LINKED TO. *
* AN EXAMPLE OF ITS USE FOLLOWS: *
* CALL LINK('SORT ', PARM); *
* WHERE SORT IS THE ENTRY POINT AND PARM IS THE PARAMETER FIELD *
* REGISTER ONE SHOULD POINT TO. *
* IF THERE IS MORE THAN ONE PARAMETER THEN THEY SHOULD FOLLOW AS: *
* CALL LINK('SORT ', PARM1, PARM2, PARM3); *
* *
* THE ROUTINE CAN BE USED WITH DIFFERENT NUMBERS OF PARAMETERS BY *
* DECLARING IT LIKE THIS: *
* DECLARE LINK ENTRY OPTIONS(ASM, INTER, RETCODE); *
* *
* NOTE: PL/I ERROR MSG OFFSETS ARE RELATIVE TO REAL ENTRY POINT *
* R11 - PROCEDURE BASE *
* R12 - RESERVED *
* R13 - ADDRESS OF DYNAMIC STORAGE AREA *
* *
***********************************************************************
EJECT
LINKA AMODE 31
LINKA RMODE ANY
***********************************************************************
*** ASSEMBLER ENTRY POINT *********************************************
***********************************************************************
USING *,15 IDENTIFY BASE REGISTER
B START SKIP IDENTIFICATION SECTION
DC AL1(4) PROGRAM IDENTIFIER
DC C'LINK V2.1 BY CLYDE THOMAS ZUBER '
START STM 14,12,12(13) STORE REGISTERS
LR 2,1 ADDRESS OF PARM ADDR LIST
GETMAIN R,LV=STOREND-STORAGE
L 15,16(13) RESTORE R15 (BASE REG)
ST 13,4(1) CHAIN SAVE AREAS
ST 1,8(13) ..
MVI 0(1),X'00' CLEAR FLAG (WILL DO FREEMAIN)
LR 13,1 POINT TO DSA
USING STORAGE,13 ..
B LINKPROC SKIP OTHER ENTRY CODE
EJECT
***********************************************************************
*** PL/I REAL ENTRY - PROLOGUE CODE ***********************************
***********************************************************************
ENTRY LINK
DC C' LINK' PROGRAM IDENTIFIER
DC AL1(4) ..
LINK DS 0H
USING *,15 IDENTIFY BASE REGISTER
STM 14,12,12(13) SAVE REGISTERS
LR 2,1 SAVE PARAMETER LIST ADDRESS
LA 0,STOREND-STORAGE PUT THE LENGTH OF THE NEW DSA IN R0
L 1,76(13) PTR NEXT AVAIL BYTE AFTER LAST DSA
ALR 0,1 ADD THEM TOGETHER
CL 0,12(12) COMPARE WITH LAST AVAILABLE BYTE
BNH SPCAVAIL IT WILL FIT
L 15,116(12) OBTAIN MORE STORAGE (PL/I ROUTINE)
BALR 14,15 ..
SPCAVAIL L 14,72(13) GET ADDR OF LSW FROM OLD DSA
LR 15,0 COPY R0 (NAB AFTER NEW DSA)
STM 14,0,72(1) SAVE LSW AND NAB IN NEW DSA
L 15,16(13) RESTORE R15 (BASE REG)
ST 13,4(1) ADDR OF LAST DSA IN NEW DSA
ST 1,8(13) CHAIN SAVE AREA (NOT DONE BY PL/I)
MVI 0(1),X'80' SET FLAGS IN DSA TO PRESERVE PL/I
MVI 1(1),X'00' ERROR HANDLING IN THIS ROUTINE
MVI 86(1),X'91' ..
MVI 87(1),X'C0' ..
LR 13,1 POINT TO NEW DSA
USING STORAGE,13 ..
EJECT
***********************************************************************
*** PROCEDURE BASE ****************************************************
***********************************************************************
LINKPROC EQU *
BALR 11,0 RESET BASE ADDRESS
USING *,11 IDENTIFY BASE REGISTER
LA 1,0 ZERO OUT DCB ADDR PARAMETER IN LST
ST 1,LST+4 ..
L 3,0(2) GET ADDR OF FIRST ARGUMENT
LA 1,4(2) R1 => TO ARGUMENT ADDR LIST FOR LINK
LINK EPLOC=(3),SF=(E,LST) ISSUE LINK, EXEC FORM
***********************************************************************
*** EPILOGUE CODE *****************************************************
***********************************************************************
LR 1,13 COPY R13
L 13,4(13) RESTORE R13
ST 15,16(13) SAVE RETURN CODE
TM 0(1),X'80' IS DSA FROM PL/I?
BO RETURN YES, NO FREEMAIN REQUIRED
LA 0,STOREND-STORAGE GET LENGTH
FREEMAIN R,LV=(0),A=(1) FREE DSA
RETURN LM 14,12,12(13) RESTORE CALLER'S REGISTERS
BR 14 RETURN
***********************************************************************
*** DYNAMIC STORAGE AREA **********************************************
***********************************************************************
STORAGE DSECT
SAVEAREA DS 22F
LST LINK ,SF=L
STOREND DS 0D
END