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Assembler Language Programming:
Intermediate
| Duration: 5 days |
| Participants: This course is for application and systems programmers that need to use intermediate level language facilities when using the IBM High Level Assembler. |
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Objectives:
Upon successful completion of this course you will be able to:
- Utilize Boolean logic and logical operations. - Use advanced data manipulation instructions. - Transfer control to other programs via CALL, LOAD, and LINK macros. - Acquire and use additional memory via GETMAIN services and DSECTs. - Read and write VSAM KSDSs (key-sequenced datasets). - Code, assemble and linkedit assembler programs utilizing 31-bit addressing. - Code, assemble and linkedit reentrant and reusable programs. - Use system provided macros and system variables. - Write assembler macros using the macro language, including MACRO, MEND, MEXIT, MNOTE, AGO, AIG, AIF, ANOP, etc. |
| Overview: This course teaches participants how to use the intermediate techniques available when programming HLASM (IBM's High Level Assembler). |
| Prerequisites: Courses in Introduction to z/OS, TSO/ISPF, Basic MVS JCL, and Basic Assembler Programming, or equivalent experience is required. |
| Format: Lecture and hands-on workshops. |
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Topic Outline:
- Logical Instructions, Bit Manipulation, and Testing Bit Manipulation AND OR XOR - EXCLUSIVE OR TM – Test Under Mask Branching After TM IC - Insert Character STC - Store Character - Advanced Data Manipulation Instructions ICM – Insert (LOAD) Characters Under Mask STCM – Store Characters Under Mask CLM – Compare Logical Characters Under Mask EX – Execute MVCL – Move Characters Long MVCL Tips CLCL – Compare Logical Characters Long MVO – Move with Offset - System Macros TIME Extracting Month from TIME Macros SNAP ABEND Macro WTO WTOR Macro WAIT Macro DOM Macro Above the Line, Below the Line, the Bar Memory Types Virtual Storage Management VS Memory Management Subpools GETMAIN Macro FREEMAIN Macro - Using VSAM Datasets VSAM File Organization KSDS VSAM KSDS Example IDCAMS Utility IDCAMS – CREATE KSDS IDCAMS – Load and Print KSDS VSAM Macros – Building Control Blocks VSAM Macro – Assessing Control Blocks VSAM Macros – Data and Requests ACB Macro RPL Macro VSAM Macro Connections ACB Options RPL Options OPEN Macro CLOSE Macro GET, PUT, ERASE Macros Some Macro Combinations EXLST Macro SHOWCB Macro GET Move Mode vs. Locate Mode Example of VSAM Update - Subroutines and Addressing Eye Catchers Linkage Instructions BAL/R vs. BAS/R Modular Code – Internal Subroutines Invoking an External Subroutine Static vs. Dynamic Calls Preserving Registers Save Areas LTR and R15 Link Parameter Passing Using Register 1 LINK, LTR, WTO Example DSECTS with I/O Parms from JCL Example Dynamic Calls Call Static Call – Linkage Editor and GO LOAD, CALL DELETE 24-bit vs. 31-bit Addressing LOAD CALL CALL – List Form CALL – Execute Form DELETE ENTRY and EXTERN - Reentrant / Serially Reusable Programs Concepts Reentrant JCL Parms How to Code Reentrant - Writing User Macros and Assembler Instructions Assembler Instructions Macro Defining a Macro Comment on Prototype Statement Macro Prototype Statement MYADD – Macro ADD Example Keyword Parameters Local and Global Symbols in Macros LCLx and GBLx Example SETx Example SETA SETB SETC Macro Statements - Overview AIF and AGO EQUREGS Macro Example Concatenation FMOVE Macro CMOVE Macro &SYSNDX – Local System Symbolic Variable Parameter Sublists FADDER Macro Example Storage Attributes CNOP System Variables |
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