HLASM: V1R6 Language Ref

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Relationship of assembler to operating systemz/OS provides the following services:v For assembling the source module:– A control program– Sequential data sets to contain source code– Libraries to contain source code and macro definitions– Utilitiesv For preparing for the execution of the assembler program as represented by theobject module:– A control program– Storage allocation– Input and output facilities– Linker or binder– LoaderCMS provides the following services:v For assembling the source module:– An interactive control program– Files to contain source code– Libraries to contain source code and macro definitions– Utilitiesv For preparing for the execution of the assembler program as represented by theobject modules:– An interactive control program– Storage allocation– Input and output facilities– Linker– A loaderz/VSE provides the following services:v For assembling the source module:– A control program– Sequential data sets to contain source code– Libraries to contain source code and macro definitions– Utilitiesv For preparing for the execution of the assembler program as represented by theobject module:– A control program– Storage allocation– Input and output facilities– Linker||||||||||||Linux for System z provides the following services:v For assembling the source module:– An interactive control program– Files to contain source code– Utilitiesv For preparing for the execution of the assembler program as represented by theobject modules:– An interactive control program– Storage allocation– Input and output facilities– Linker– A loader8 HLASM: V1R6 Language Ref
Coding made easierCoding made easierIt can be very difficult to write an assembler language program using onlymachine instructions. The assembler provides additional functions that make thistask easier. They are summarized below.Symbolic representation of program elementsSymbols greatly reduce programming effort and errors. You can define symbols torepresent storage addresses, displacements, constants, registers, and almost anyelement that makes up the assembler language. These elements include operands,operand subfields, terms, and expressions. Symbols are easier to remember andcode than numbers; moreover, they are listed in a symbol cross reference table,which is printed in the program listings. Thus, you can easily find a symbol whensearching for an error in your code. See page 28 for details about symbols, andhow you can use them in your program.Variety in data representationYou can use decimal, binary, hexadecimal, or character representation of machinelanguage binary values in writing source statements. You select the representationbest suited to the purpose. The assembler converts your representations into thebinary values required by the machine language.Controlling address assignmentIf you code the correct assembler instruction, the assembler computes the relativeoffset, or displacement from a base address, of any symbolic addresses you specifyin a machine instruction. It inserts this displacement, along with the base registerassigned by the assembler instruction, into the object code of the machineinstruction.At execution time, the object code of address references must be inrelative-immediate or base-displacement form. The computer obtains the requiredaddress by adding the displacement to the base address contained in the baseregister, or from the relative-immediate offset of the instruction.RelocatabilityThe assembler produces an object module that is independent of the location it isinitially assigned in virtual storage. That is, it can be loaded into any suitablevirtual storage area without affecting program execution. This is made easierbecause most addresses are assembled in their base-displacement form.Sectioning a programYou can divide a source module into one or more control sections. After assembly,you can include or delete individual control sections from the resulting objectmodule before you load it for execution. Control sections can be loaded separatelyinto storage areas that are not contiguous. A discussion of sectioning is containedin “Source program structures” on page 50.Linkage between source modulesYou can create symbolic linkages between separately assembled source modules.This lets you refer symbolically from one source module to data and instructionsdefined in another source module. You can also use symbolic addresses to branchbetween modules.Chapter 1. Introduction 9
Page 1: High Level Assembler for z/OS & z/V
Page 4 and 5: Note!Before using this information
Page 8 and 9: |Open code . . . . . . . . . . . .
Page 10 and 11: Programming interface informationOr
Page 12 and 13: IBM High Level Assembler for z/OS &
Page 14 and 15: Syntax notationFormat▌A▐ ▌B
Page 16 and 17: Double-byte character set notationx
Page 18: Summary of changesxvi HLASM: V1R6 L
Page 21 and 22: Chapter 1. IntroductionA computer c
Page 23 and 24: Assembler languagev Macro instructi
Page 25: Assembler programProcessingConditio
Page 29 and 30: Chapter 2. Coding and structureThis
Page 31 and 32: Character setTable 4. Examples usin
Page 33 and 34: Assembler language coding conventio
Page 39 and 40: Assembler language structureThe mac
Page 41 and 42: Assembler language structureMachine
Page 43 and 44: Assembler language structureConditi
Page 45 and 46: Mnemonic tags|||||||||For example,
Page 47 and 48: Terms, literals, and expressions- T
Page 49 and 50: Terms, literals, and expressionsAss
Page 51 and 52: Terms, literals, and expressionsUsi
Page 53 and 54: Terms, literals, and expressions|||
Page 55 and 56: Terms, literals, and expressionsz/V
Page 57 and 58: Terms, literals, and expressionsTab
Page 59 and 60: Terms, literals, and expressions1.
Page 61 and 62: Terms, literals, and expressions1.
Page 63 and 64: Terms, literals, and expressions┌
Page 65 and 66: Terms, literals, and expressionsA-Y
Page 67 and 68: Chapter 3. Program structures and a
Page 69 and 70: SourcemoduleA source module is comp
Page 71 and 72: Beginning of a source modulev The S
Page 73 and 74: Beginning of a source moduleReferen
Page 75 and 76: Beginning of a source moduleNote: T
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Beginning of a source moduleClass l
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Beginning of a source modulez/VM an
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AddressingBase Address Definition:
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QualifiedDependentaddressingQualifi
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Addressingz/VM and z/OSWhen you spe
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Addressing..EX_SYM DC V(EXMOD1) Add
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AddressingSee the appendix “Objec
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Part 2. Machine and assembler instr
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Chapter 4. Machine instruction stat
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Input/output operationsThe input or
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Branching with extended mnemonic co
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Statement formatsSymbolic operation
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Operand entriesRegistersYou can spe
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Operand entriesv Explicitly—in a
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Operand entriesImmediateused by the
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Examples of coded machine instructi
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Chapter 5. Assembler instruction st
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*PROCESS statementstatement, follow
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ACONTROL instruction►►NOCOMPAT,
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ACONTROL instructionFLAG(PAGE0)inst
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ACONTROL instruction|||may be fetch
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AINSERT instruction►►sequence_s
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ALIAS instruction||||||The alias_st
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AMODE instructionCATTR instruction
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CATTR instructionRMODE(ANY)The text
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CCW and CCW0 instructionssupport 31
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CEJECT instructionIf number of line
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CNOP instructionAfter the BALR inst
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COPY instructioncopied from either
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CSECT instructionsame section name
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CXD instructionZETA: the resulting
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DC instruction10EBP(7)L2’12’the
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DC instructionTable 17. Length attr
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DC instruction4. Double-byte data i
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DC instructionTable 19. Type codes
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DC instructionYou may omit the modi
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DC instructionfirst constant to be
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DC instructionTable 21. Specifying
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DC instruction—Character constant
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DC instruction—Character constant
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DC instruction—Graphic constantTa
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DC instruction—Fixed-point consta
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DC instruction—Fixed-point consta
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DC instruction—Decimal constantsD
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DC instruction—Address constants|
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DC instruction—Address constantsT
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DC instruction—Offset constantIn
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DC instruction—Hexadecimal floati
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DC instruction—Decimal floating-p
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Syntax of binary, decimal, and hexa
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DC instruction—Binary floating-po
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DROP instructionLabeledDependentIf
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DS instructionv An ordinary symbolv
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DS instructionthe data that follows
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DSECT instructionTo effect referenc
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DXD instructionnominal_valueis the
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END instructionNotes:1. If the END
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EQU instruction||||to the symbol in
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EQU instruction|FPR Register - Floa
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EXITCTL instructionSee the section
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ISEQ instruction►►sequence_symb
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LOCTR instructionA LOCTR name may b
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LTORG instructionAddressingDuplicat
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MNOTE instructionNote: The maximum
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OPSYN instruction||||||v An operati
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ORG instruction||||||||If symbol de
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ORG instructionThat is, the ORG ins
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PRINT instructionPRINT instructionT
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PRINT instructionexceeded the macro
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PUNCH instructionv A pair of single
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REPRO instruction||Notes:1. The ide
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RSECT instructionThe beginning of a
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TITLE instructionv Provides heading
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TITLE instructionIf the TITLE state
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USING instructioninstructions suppo
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USING instructionby means of anothe
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USING instructionLabeled USING inst
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USING instructionDomain of a labele
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USING instructionIf the dependent U
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XATTR instructionXATTR instruction
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XATTR instructionSCOPE(MODULE), abb
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232 HLASM: V1R6 Language Ref
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Name entry . . . . . . . . . . . .
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Macro definitionA macro definition
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Macro instructionThe macro instruct
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Where to define a macro in a source
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Prototype statement|||||specified o
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Model statementsEach field or subfi
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Model statementsTable 37. Rules for
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Model statements||v Variable symbol
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Symbolic parametersPositionalKeywor
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Other conditional assembly instruct
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AREAD instruction||If no operand is
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MEXIT instructionThe MEXIT instruct
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System variable symbols1 macro2 get
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&SYSADATA_MEMBER System Variable Sy
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&SYSDATC System Variable SymbolYYYY
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&SYSECT System Variable Symbolv Sta
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&SYSIN_MEMBER System Variable Symbo
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&SYSLIB_DSN System Variable SymbolS
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&SYSLIN_DSN System Variable SymbolE
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&SYSLIST System Variable Symbolposi
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&SYSLOC System Variable Symbolinstr
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&SYSNDX System Variable Symbol1 MAC
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&SYSNDX System Variable SymbolState
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&SYSOPT_RENT System Variable Symbol
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&SYSPRINT_DSN System Variable Symbo
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&SYSPUNCH_DSN System Variable Symbo
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&SYSSEQF System Variable Symbol1. I
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&SYSTEM_ID System Variable SymbolNo
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&SYSTERM_VOLUME System Variable Sym
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&SYSVER System Variable Symbol294 H
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Macro instruction format|name_entry
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Macro instruction formatOperandYou
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Macro instruction formatAny keyword
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Macro instruction formatparameters
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Sublists in operandsTable 48. Relat
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Values in operandsUnquotedSpecial2.
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Values in operands’SPACES ALLOWED
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Levels of macro call nestingLevels
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Levels of macro call nestingCOMPAT(
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Levels of macro call nesting&SYSSEQ
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SET symbolsSET symbolsSET symbols a
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SET symbolsTable 50. Features of SE
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SET symbolspreceding 999999 element
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Data attributesTable 51. Data attri
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Data attributesThe values of attrib
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Data attributesV R-, V-type address
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Data attributes|||||||||Notes:1. Or
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Data attributesv If the first opera
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Data attributesCount attribute (K')
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Data attributes||||||defined attrib
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Sequence symbolsparameter wherever
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LookaheadSequencelater defined by O
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GBLA, GBLB, and GBLC instructionsGB
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LCLA, LCLB, and LCLC instructions,
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Assigning values to SET symbolsLogi
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Assigning values to SET symbolsTabl
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SETA instructionTable 58. Variable
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SETA instructionB2A(’’) has val
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SETA instruction|||||||||||||||||||
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SETA instructionAfter the following
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SETA instruction10. An arithmetic e
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SETA instructionarithmetic value
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SETB instructionv A logical express
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SETB instructionOR Format: Logical-
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SETC instructionSETCinstructionThe
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SETC instruction|LCLC &C1,&C2LCLC &
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Substring notationv When e2 has a v
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Substring notation||||ExamplesA2D(0
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Substring notationC2X Format: Funct
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Substring notationSuppose the SETC
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Substring notationX2C(’’) has v
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Substring notationFor example, eith
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Substring notationStatement 1 assig
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SETAF instruction►► variable_sy
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AIF instructionsequence_symbolis a
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AIF instructionAIFB—synonym of th
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ACTR instruction►►sequence_symb
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MHELP optionsparameters are dumped
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Assembler instructions and statemen
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Summary of constantsTable 65. Summa
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Macro and conditional assembly lang
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Standard character set code tableHe
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Standard character set code tableHe
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NoticesPURPOSE. Some states do not
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z/VM: CP Planning and Administratio
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ALIAS instruction 108maximum operan
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comment statements (continued)ordin
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GG-type graphic constant 144GBLA in
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macro instructions (continued)opera
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eference constant (R) 154reference
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UUHEADPRINT instruction 206unary op
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