This four-day course is designed to build on the skills taught in the 'Using z/OS Assembler' course. It starts with a short review of the basic Assembler instructions before introducing more advanced areas such as general addressability, 31 and 64 bit addressing, re-entrancy, macro usage, debugging and recovery.<br>The course also covers the Assembler macro language fundamentals and z/OS Control Block usage, essential knowledge required when maintaining and writing z/OS exits.<br><br>This course is also available for one-company, on-site presentations and for live presentation over the Internet, via the Virtual Classroom Environment service.
Advanced Assembler and Macro Usage
Prerequisite for this course is attendance on Using z/OS Assembler course or equivalent experience. It is not mandatory but it would be helpful to have also attended the courses z/OS System Fundamentals Part 1 & z/OS System Part 2.
- use advanced addressability techniques
- use data management macros
- receive and pass subroutine parameters and process return codes
- utilise the linkage stack
- apply 31 & 64 bit addressing concepts
- write re-entrant code
- use the basic Assembler macro language
- code Binder control statements
- use MVS control blocks in exit routines
- use supervisor services macros
- debug dumps
- write ESTAE routines
- write re-entrant programs.
Control Sections - CSECTS; CSECT addressability - methods and examples; DROP directive; CSECTS in excess of 4K; Multiple Base Registers; Reference by explicit address; Reference by Dummy Section; DSECT mapping and external storage; MVS control block DSECTs; Explicit reference and internal control blocks; DSECT reference and internal control blocks; DSECT reference and external control blocks.I/O and Data Management
Sequential files: Fixed Length Records, Variable Length Record; Data Control Block (DCB); QSAM DCB; OPEN macro; CLOSE macro; Using the GET macro in Move mode; Using the PUT macro in Move mode; Using the GET macro in Locate mode; Using the PUT macro in Locate mode; Execute.Intermodule Communication
Static Load Module structure and the VCON; Static Load Module linkage - 'CALL' macro; Secondary entry points; Establishing addressability for secondary entry points; External references using EXTRN; Save Area conventions; Standard Module linkage; SAVE and RETURN macros; Parameter passing standard convention; PARM keyword on JCL EXEC statement; Parameter passing using Explicit Interface; CALL macro: Explicit Parameter Interface, Implicit Parameter Interface, Implicit Variable Parameter Interface; Return code setting; Return code testing; Manipulating the Linkage Stack with BAKR and PR; Status saving using the Linkage Stack.Extended Addressability
Virtual Storage; Establishing AMODE and RMODE values; AMODE and RMODE combination rules; Addressing mode sensitivity; Mode setting instructions - BASSM and BSM; Calling and returning using BASSM and BSM (Basic Mode); Mode switching to retrieve data from above 16 MB; Using pointer-defined linkage; BASSM & BSM in 64 bit mode; Using linkage assist routines; Using capping to assist linkage to 24-bit program; Using capping to assist linkage to 31-bit program.Binder (Linkage editor)
Binder overview; Resolving external references; Object and LOAD module records; External Symbol Dictionary; ReLocation Dictionary; Automatic library call feature; Weak external reference; Binder JCL; Binder module attribute options; Binder module processing and output options; Binder control statements; Binder codes; AMBLIST utility.Debugging
Problem program dump facilities; ABEND; SNAP; ABEND dump files; ABEND dump default contents; Summary dump; Symptom dump; ABEND macro; Parameter descriptions; SNAP macro; SNAP SDATA options; SNAP PDATA options; Save Area traces; Save Area trace and linkage stack entry.System Services
event synchronisation; WAIT macro; POST macro; write to log macro (WTL); write to operator macro (WTO); write to operator with reply macro (WTOR); delete operator message macro (DOM); TIME macro; STIMER macro; TTIMER macro; CPUTIMER macro.Recovery
Recovery flow; ESTAE macro; System Diagnostic Work Area (SDWA); recovery routine processing; SETRP macro; retry options; lab exercise (write an ESTAE recovery routine).Advanced Instructions
Move long (MVCL); compare logical long (CLCL); translate (TR); translate & test (TRT); edit (ED); edit & mark (EDMK).Macro Language Fundamentals
Macro language introduction; macro language feature; defining a macro - basic rules; passing positional parameters; passing keyword parameters; parameter and keyword sublists; common system variables; testing how a field was defined; Lab exercise.Task Management
LINK; LOAD ATTACH; XCTL.Re-entrant & Re-usable Code
Re-entrant and re-usable code - objectives; re-usable code (REUS) ; re-entrant code (RENT) - the rules; RENT- how do you do it?; Re-entrant code example; List and Execute forms of macros; Getting the re-entrant benefit; Refreshable; Lab exercise (make a routine re-entrant).
Face-to-face learning in the comfort of our quality nationwide centres, with free refreshments and Wi-Fi.
Find dates and prices
We have 4 courses available across 2 locations on 4 different dates
EastCall us on 0113 220 7150 to discuss availability in this region.Contact us
London1 Location / 2 coursesView dates
MidlandsCall us on 0113 220 7150 to discuss availability in this region.Contact us
NorthCall us on 0113 220 7150 to discuss availability in this region.Contact us
ScotlandCall us on 0113 220 7150 to discuss availability in this region.Contact us
South1 Location / 2 coursesView dates
Attend from AnywhereCall us on 0113 220 7150 to discuss availability in this region.Contact us
All locations2 Locations / 4 coursesView dates
Fully accredited to ensure we provide the highest possible standards in learning