Assembler Instruction using RS Format
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Store Characters under Mask Assembler Instruction using RS Format |
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Introduction
This 370 Assembler program provides different techniques for using the RS Format of the Store Characters under Mask (or STCM) Instruction. The assembler program is written to comply with an IBM Mainframe Assembler dialect. The program will compile using Assembler/H or HLASM. A JCL member is provided as a job script to run as a batch job on an IBM Mainframe System with ZOS or a Windows System with Micro Focus Enterprise Developer.
The bytes stored in the register specified by operand-1 (r1) are stored at the storage address specified by operand-2 (x2+b2+d2) under control of the mask (m3).
m3=0001, similar to STC
m3=0011, similar to STH
m3=1111, similar to ST
m3=0111, store 24-bit address
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| STCM, Store Character under Mask Instruction, the operand format is R1,M3,D2(B2) |
This program may serve as a tutorial for programmers that are new to 370 Assembler and as a reference for experienced programmers.
We have made a significant effort to ensure the documents and software technologies are correct and accurate. We reserve the right to make changes without notice at any time. The function delivered in this version is based upon the enhancement requests from a specific group of users. The intent is to provide changes as the need arises and in a timeframe that is dependent upon the availability of resources.
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The JCL Member
The following is the mainframe JCL (AISTCMJ1.jcl) required to run the assembler program. The JOB statement will need to be modified for specific mainframe environments. This will also run on a Windows System using Mainframe Express provided by Micro Focus.
//AISTCMJ1 JOB SIMOTIME,ACCOUNT,CLASS=1,MSGCLASS=0,NOTIFY=CSIP1 //* ******************************************************************* //* AISTCMJ1.JCL - a JCL Member for Batch Job Processing * //* This JCL Member is provided by SimoTime Technologies * //* (C) Copyright 1987-2019 All Rights Reserved * //* Web Site URL: http://www.simotime.com * //* e-mail: helpdesk@simotime.com * //* ******************************************************************* //* //* Text - Regression Test, HLASM, STCM Instruction //* Author - SimoTime Technologies //* Date - January 01, 1989 //* //* Multiple executions of the STCM Instruction using various masks. //* //* This set of programs will run on a mainframe under MVS or on //* a Personal Computer running Windows and Mainframe Express by //* Micro Focus. //* //* ************ //* * AISTCMJ1 * //* ********jcl* //* * //* * //* ************ ************ //* * AISTCMA1 *-----* SYSCON * //* ********mlc* ************ //* * //* ************ //* * EOJ * //* ************ //* //* ******************************************************************* //* Step 1 of 1, This is a single step job. //* //AISTCMS1 EXEC PGM=AISTCMA1 //STEPLIB DD DSN=SIMOTIME.DEMO.LOADLIB1,DISP=SHR //SYSOUT DD SYSOUT=* //*
The Mainline Assembler Program
This program (AISTCMA1.mlc) abides by the mainframe calling protocol and register usage guidelines. Register-15 is used to pass a return-code and register-14 contains the return address for the calling program. This program executes five (5) examples of the STCM Instruction.
***********************************************************************
* AISTCMA1.MLC - This is an HLASM Program *
* Provided by SimoTime Technologies *
* (C) Copyright 1987-2019 All Rights Reserved *
* Web Site URL: http://www.simotime.com *
* e-mail: helpdesk@simotime.com *
***********************************************************************
* *
* Created: 1976/06/01, Simmons *
* Changed: 1976/06/01, Simmons, no changes to date... *
* *
***********************************************************************
*
* Store Characters Under Mask, an RS Instruction, Mnemonic is STCM.
*
AISTCMA1 CSECT
SAVE (14,12)
BALR 12,0
USING *,12
WTO '* AISTCMA1 - Starting'
* Store Character under Mask
*
* STCM R1,M3,D2(B2)
*
* The contents of OPERAND-1 is stored at
* OPERAND-2 under control of OPERAND-3.
*
L R5,=X'A0B1C2D3' Initialize REGISTER for STCM's
*
***********************************************************************
* Step 1 of 6, The following STCM with a mask of X'F' (1111)
* is the same as a STORE (ST) instruction.
*
RT4MASKF EQU *
MVC STCMDAT1(4),XFFL004 * Initialize target STORAGE
STCM R5,MASKF,STCMDAT1 * STORE all four bytes (1111)
*
MVC WTOMSG(76),WTOAOK * Assume AOK
CLC STCMDAT1(4),STCMEXPF
BE *+14
MVI STATUS,C'4'
MVC WTOMSG(76),WTONOK
MVC WTOTAG(6),=CL6'MASK-F'
BAS R3,DOMSG * DISPLAY MESSAGE, RETURN VIA R3
*
*
***********************************************************************
* Step 2 of 6, The following STCM with a mask of X'8' (1000)
* will store BYTE-0 of the contents of R5.
*
RT4MASK8 EQU *
MVC STCMDAT2(4),X00L004 * Initialize target STORAGE
STCM R5,MASK8,STCMDAT2 * STORE BYTE-0 (1000)
*
MVC WTOMSG(76),WTOAOK * Assume AOK
CLC STCMDAT2(4),STCMEXP8
BE *+14
MVI STATUS,C'4'
MVC WTOMSG(76),WTONOK
MVC WTOTAG(6),=CL6'MASK-8'
BAS R3,DOMSG * DISPLAY MESSAGE, RETURN VIA R3
*
*
***********************************************************************
* Step 3 of 6, The following STCM with a mask of X'3' (0011)
* will store bytes 2 and 3 of the contents of R5,
* Performs the same function as a STORE- HALFWORD instruction (STH).
*
MVC STCMDAT3(4),X00L004 * Initialize target STORAGE
STCM R5,MASK3,STCMDAT3 * STORE BYTES 2 and 3 (0011)
*
MVC WTOMSG(76),WTOAOK * Assume AOK
CLC STCMDAT3(4),STCMEXP3
BE *+14
MVI STATUS,C'4'
MVC WTOMSG(76),WTONOK
MVC WTOTAG(6),=CL6'MASK-3'
BAS R3,DOMSG * DISPLAY MESSAGE, RETURN VIA R3
*
*
***********************************************************************
* Step 4 of 6, The following STCM with a mask of X'7' (0111)
* will store bytes 1, 2 and 3 of the contents of R5, this may
* be used to store 24-bit (3-BYTE) addresses into control blocks.
*
MVC STCMDAT4(4),X00L004 * Initialize target STORAGE
STCM R5,MASK7,STCMDAT4 * STORE BYTES 1, 2 and 3 (0111)
*
MVC WTOMSG(76),WTOAOK * Assume AOK
CLC STCMDAT4(4),STCMEXP7
BE *+14
MVI STATUS,C'4'
MVC WTOMSG(76),WTONOK
MVC WTOTAG(6),=CL6'MASK-7'
BAS R3,DOMSG * DISPLAY MESSAGE, RETURN VIA R3
*
***********************************************************************
* Step 5 of 6, The following STCM with a mask of X'7' (0101)
* will store bytes 1 and 3 of the contents of R5.
*
MVC STCMDAT5(4),X00L004 * Initialize target STORAGE
STCM R5,MASK5,STCMDAT5 * STORE BYTES 1 and 3 (0101)
*
MVC WTOMSG(76),WTOAOK * Assume AOK
CLC STCMDAT5(4),STCMEXP5
BE *+14
MVI STATUS,C'4'
MVC WTOMSG(76),WTONOK
MVC WTOTAG(6),=CL6'MASK-5'
BAS R3,DOMSG * DISPLAY MESSAGE, RETURN VIA R3
*
***********************************************************************
* Step 6 of 6, The following STCM with a mask of X'A' (1010)
* will store bytes 0 and 2 of the contents of R5.
*
MVC STCMDAT6(4),X00L004 * Initialize target STORAGE
STCM R5,MASKA,STCMDAT6 * STORE BYTES 0 and 2 (1010)
*
MVC WTOMSG(76),WTOAOK * Assume AOK
CLC STCMDAT6(4),STCMEXPA
BE *+14
MVI STATUS,C'4'
MVC WTOMSG(76),WTONOK
MVC WTOTAG(6),=CL6'MASK-A'
BAS R3,DOMSG * DISPLAY MESSAGE, RETURN VIA R3
*
***********************************************************************
RETURN EQU *
CLI STATUS,C'0'
BNE ABEND04
WTO '* AISTCMA1 - Finished with RC=0000'
SR R15,R15 * Set Return Code to Zero
RETURN (14,12),RC=(15)
*
***********************************************************************
ABEND04 EQU *
WTO '* AISTCMA1 - ABENDING with RC=0004'
LA R15,4 * Set Return Code to 0004
RETURN (14,12),RC=(15)
***********************************************************************
STCMDATA DS 0H
STCMDAT1 DC XL4'00000000'
STCMDAT2 DC XL4'00000000'
STCMDAT3 DC XL4'00000000'
STCMDAT4 DC XL4'00000000'
STCMDAT5 DC XL4'00000000'
STCMDAT6 DC XL4'00000000'
*
STATUS DC CL1'0'
DS 0H
STCMEXPF DC XL4'A0B1C2D3'
STCMEXPA DC XL4'A0C20000'
STCMEXP8 DC XL4'A0000000'
STCMEXP7 DC XL4'B1C2D300'
STCMEXP5 DC XL4'B1D30000'
STCMEXP3 DC XL4'C2D30000'
*
X00L004 DC XL4'00000000'
XFFL004 DC XL4'FFFFFFFF'
*
MASKF EQU X'F'
MASKA EQU X'A'
MASK8 EQU X'8'
MASK7 EQU X'7'
MASK5 EQU X'5'
MASK4 EQU X'4'
MASK3 EQU X'3'
MASK2 EQU X'2'
MASK1 EQU X'1'
*
***********************************************************************
* The following is an example of a user-coded WTO buffer.
*
DS 0H * INSURE HALF-WORD ALIGNMENT
WTOBLOCK EQU *
DC H'80' * For WTO, length of WTO buffer...
DC H'0' should be binary zeroes...
WTOMSG EQU *
DC CL22'* AISTCMA1 - USERINFO '
WTOTAG DC CL06'WTOTAG'
DC CL48' User message goes here '
*
WTONOK EQU *
DC CL22'* AISTCMA1 - ABENDING '
DC CL06'WTOTAG'
DC CL48' NOK, Actual NE expected '
WTOAOK EQU *
DC CL22'* AISTCMA1 - Executed '
DC CL06'WTOTAG'
DC CL48' AOK, Actual EQ expected '
*
***********************************************************************
* Common WTO routine to display WTOBLOCK...
*
DOMSG EQU *
WTO MF=(E,WTOBLOCK)
BR R3 * Return via Register 3
***********************************************************************
REGS
END
Summary
This 370 Assembler program provides different techniques for using the RS Format of the Store Characters under Mask Instruction. This document may be used to assist as a tutorial for new assembler programmers or as a quick reference for experienced programmers. The samples focus on the coding techniques of the individual instructions. As always, it is the programmer's responsibility to thoroughly test all programs.
Permission to use, copy, modify and distribute this software, documentation or training material for any purpose requires a fee to be paid to SimoTime Technologies. Once the fee is received by SimoTime the latest version of the software, documentation or training material will be delivered and a license will be granted for use within an enterprise, provided the SimoTime copyright notice appear on all copies of the software. The SimoTime name or Logo may not be used in any advertising or publicity pertaining to the use of the software without the written permission of SimoTime Technologies.
SimoTime Technologies makes no warranty or representations about the suitability of the software, documentation or learning material for any purpose. It is provided "AS IS" without any expressed or implied warranty, including the implied warranties of merchantability, fitness for a particular purpose and non-infringement. SimoTime Technologies shall not be liable for any direct, indirect, special or consequential damages resulting from the loss of use, data or projects, whether in an action of contract or tort, arising out of or in connection with the use or performance of this software, documentation or training material.
Software Agreement and Disclaimer
Permission to use, copy, modify and distribute this software, documentation or training material for any purpose requires a fee to be paid to SimoTime Technologies. Once the fee is received by SimoTime the latest version of the software, documentation or training material will be delivered and a license will be granted for use within an enterprise, provided the SimoTime copyright notice appear on all copies of the software. The SimoTime name or Logo may not be used in any advertising or publicity pertaining to the use of the software without the written permission of SimoTime Technologies.
SimoTime Technologies makes no warranty or representations about the suitability of the software, documentation or learning material for any purpose. It is provided "AS IS" without any expressed or implied warranty, including the implied warranties of merchantability, fitness for a particular purpose and non-infringement. SimoTime Technologies shall not be liable for any direct, indirect, special or consequential damages resulting from the loss of use, data or projects, whether in an action of contract or tort, arising out of or in connection with the use or performance of this software, documentation or training material.
Downloads and Links
This section includes links to documents with additional information that are beyond the scope and purpose of this document. The first group of documents may be available from a local system or via an internet connection, the second group of documents will require an internet connection.
Note: A SimoTime License is required for the items to be made available on a local system or server.
Current Server or Internet Access
The following links may be to the current server or to the Internet.
Explore the Assembler Connection for more examples of mainframe Assembler programming techniques and sample code.
Explore The ASCII and EBCDIC Translation Tables. These tables are provided for individuals that need to better understand the bit structures and differences of the encoding formats.
Explore The File Status Return Codes that are used to interpret the results of accessing VSAM data sets and/or QSAM files.
Internet Access Required
The following links will require an internet connect.
A good place to start is The SimoTime Home Page for access to white papers, program examples and product information. This link requires an Internet Connection
Explore The Micro Focus Web Site for more information about products (including Micro Focus COBOL) and services available from Micro Focus. This link requires an Internet Connection.
Glossary of Terms
Explore the Glossary of Terms for a list of terms and definitions used in this suite of documents and white papers.
Contact or Feedback
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| 2. | Our telephone numbers are as follows. |
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| STCM, Store Characters under Mask, RS Format |
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