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SVC.ASM
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SVC.ASM
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SVCA CSECT
* SVC VERSION 2.0 BY CLYDE THOMAS ZUBER *
***********************************************************************
* *
* ATTR: RENT,REUS,REFR,AMODE(31),RMODE(ANY) *
* *
* PROGRAM DESCRIPTION:
* *
* THIS SUBROUTINE IS FOR USE WITH HIGHER LEVEL LANGUAGES. IT *
* PROVIDES THE CAPABILITY TO PERFORM SUPERVISOR CALLS. THERE ARE *
* THREE REQUIRED PARAMETERS TO SVC. THE FIRST IS A HALF WORD WITH *
* THE SVC NUMBER IN IT. THE SECOND IS THE VALUE FOR REGISTER ZERO *
* AND THE THIRD IS THE VALUE FOR REGISTER ONE. BOTH ARE FULL WORD *
* VALUES. A RETURN CODE IS RETURNED VIA REGISTER FIFTEEN. *
* *
* THIS ROUTINE HAS TWO ENTRY POINTS. SVCA IS FOR REGULAR OS/370 *
* LINKAGE. SVC IS FOR PL/I PROGRAMS USING PL/I OPTIMIZER R3.1, R4.0 *
* AND R5.0 CONVENTIONS. *
* *
* THIS ROUTINE SHOULD BE DECLARED IN PL/I AS FOLLOWS: *
* DECLARE SVC ENTRY(FIXED BINARY, FIXED BINARY(31), *
* FIXED BINARY(31)) 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
SVCA AMODE 31
SVCA RMODE ANY
***********************************************************************
*** REGULAR OS ENTRY POINT ********************************************
***********************************************************************
USING *,15 IDENTIFY BASE REGISTER
B START SKIP IDENTIFICATION SECTION
DC AL1(3) IDENTIFCATION SECTION
DC C'SVC V2.0 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 SVCPROC SKIP OTHER ENTRY CODE
EJECT
***********************************************************************
*** PL/I REAL ENTRY - PROLOGUE CODE ***********************************
***********************************************************************
ENTRY SVC
DC C'SVC' IDENTIFCATION SECTION
DC AL1(3) ..
SVC 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 ****************************************************
***********************************************************************
SVCPROC BALR 11,0 RESET BASE ADDRESS
USING *,11 IDENTIFY BASE REGISTER
LM 2,4,0(2) GET PARAMETERS' ADDRESSES
L 0,0(3) LOAD REGISTER ZERO
L 1,0(4) LOAD REGISTER ONE
LH 2,0(2) GET SVC NUMBER
EX 2,SVCINST ISSUE SVC
***********************************************************************
*** 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
SVCINST SVC 0 SVC INSTRUCTION
***********************************************************************
*** DYNAMIC STORAGE AREA **********************************************
***********************************************************************
STORAGE DSECT
SAVEAREA DS 22F
STOREND DS 0D
END