HLASM Language Reference

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Operand Entries Format │ Coded or Symbolic │ Object Code │ Representation of │ Representation │ Explicit Address │ of Addresses ───────┼───────────────────┼────────────────────────────────────────────────────────────────────────────── │ │ │ │ │8 bits │4 │4 │4 │12 bits │4 │12 bits │ │ │ │Operation │bits │bits │bits │Displacement │bits │Displacement │ │ │ │Code │ │ │Base │ │ │ │ │ │ │ │ │ │Reg. │ │ │ │ │ │ ├───────────┼─────┼─────┼─────┼─────────────────┼─────┼─────────────────┤ │ │ │ │ │ │ ▌2▐ │ ▌1▐ │ │ │ │ │ │ │ │ │ ▼ │ ▼ │ │ │ │ │ ├ ─ ─ ─ ─ ─ ┼ ─ ─ ┼ ─ ─ ┼─────┼─────────────────┤ │ │ RS │ D(B) │ │OP CODE │ R │ R │ B │ D │ │ │ │ │ ├ ─ ─ ─ ─ ─ ┴ ─ ─ ┴ ─ ─ ┴─────┴─────────────────┤ │ │ │ │ │ ┌──▌3▐ (Index Register) │ │ │ │ │ │ ▼ │ │ │ │ │ ├ ─ ─ ─ ─ ─ ┬ ─ ─ ┬ ─ ─ ┬─────┬─────────────────┤ │ │ RX │ D(X,B) │ │OP CODE │ R │ X │ B │ D │ │ │ │ │ ├ ─ ─ ─ ─ ─ ┴ ─ ─ ┴ ─ ─ ┴─────┴─────────────────┤ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ├ ─ ─ ─ ─ ─ ┬ ─ ─ ─ ─ ─ ┬─────┬─────────────────┤ │ │ SI │ D(B) │ │OP CODE │ I │ B │ D │ │ │ │ │ ├ ─ ─ ─ ─ ─ ┴ ─ ─ ─ ─ ─ ┴─────┴─────────────────┤ │ │ │ │ │ │ ▌2▐ │ ▌1▐ │ │ │ │ │ ▼ │ ▼ │ │ │ ├ ─ ─ ─ ─ ─ ┬ ─ ─ ─ ─ ─ ┬─────┬─────────────────┼─────┼─────────────────┤ SS │ D(,B),D(B) │ │OP CODE │ L │ B │ D │ B │ D │ │ │ ├ ─ ─ ─ ─ ─ ┴ ─ ─ ─ ─ ─ ┴─────┴─────────────────┴─────┴─────────────────┤ I represents an immediate value L represents a length B, R and R represent registers Figure 23. Format of Addresses in Object Code Lengths You can specify the length field in an SS-format instruction. This lets you indicate explicitly the number of bytes of data at a virtual storage location that is to be used by the instruction. However, you can omit the length specification, because the assembler computes the number of bytes of data to be used from the expression that represents the address of the data. See page 97 for more information about SS-format instructions. Implicit Length: When a length subfield is omitted from an SS-format machine instruction, an implicit length is assembled into the object code of the instruction. The implicit length is either of the following: For an implicit address, it is the length attribute of the first or only term in the expression representing the implicit address. For an explicit address, it is the length attribute of the first or only term in the expression representing the displacement. Explicit Length: When a length subfield is specified in an SS-format machine instruction, the explicit length always overrides the implicit length. An implicit or explicit length is the effective length. The length value assembled is 90 HLASM V1R5 Language Reference
Examples of Coded Machine Instructions always one less than the effective length. If you want an assembled length value of 0, an explicit length of 0 or 1 can be specified. In the SS-format instructions requiring one length value, the allowable range for explicit lengths is 0 through 256. In the SS-format instructions requiring two length values, the allowable range for explicit lengths is 0 through 16. Immediate Data In addition to registers, numeric values, relative addresses, and lengths, some machine instruction operands require immediate data. Such data is assembled directly into the object code of the machine instructions. Use immediate data to specify the bit patterns for masks or other absolute values you need. Specify immediate data only where it is required. Do not confuse it with address references to constants and areas, or with any literals you specify as the operands of machine instructions. Immediate data must be specified as absolute expressions whose range of values depends on the machine instruction for which the data is required. The immediate data is assembled into its binary representation. Examples of Coded Machine Instructions The examples that follow are grouped according to machine instruction format, and the groups are shown in order of the instruction length. They show the various ways in which you can code the operands of machine instructions. Both symbolic and numeric representation of fields and subfields are shown in the examples. Therefore, assume that all symbols used are defined elsewhere in the same source module. The object code assembled from at least one coded statement per group is also included. A complete summary of machine instruction formats with the coded assembler language variants can be found in the applicable Principles of Operation manual. The examples that follow show the various instruction formats, and are not meant to show how the machine instructions should be used. RI Format The operand fields of RI-format instructions designate a register and an immediate operand, with the following exception: In BRC branching instructions, a 4-bit branching mask with a value between 0 and 15 inclusive replaces the register designation. Symbols used to represent registers (such as REG1 in the example) are assumed to be equated to absolute values between 0 and 15. The 16-bit immediate operand has two different interpretations, depending on whether the instruction is a branching instruction or not. There are two types of non-branching RI-format instructions. Chapter 4. Machine Instruction Statements 91
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High Level Assembler for MVS & VM &
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Note! Before using this information
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Contents Source Module . . . . . .
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Contents Ordinary USING Instruction
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Contents Sublists in Operands . . .
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About this Manual This manual descr
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IBM High Level Assembler for MVS &
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| The Internet. You can access IBM
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▌C▐ The item referred to by ▌
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Miscellany The ASCII translation t
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Part 1. Assembler Language—Struct
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Language Compatibility Language Com
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Assembler Program Assembler Program
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Relationship of Assembler to Operat
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Coding Made Easier Linkage between
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Character Set Compatibility with Ea
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Assembler Language Coding Conventio
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Assembler Language Structure Condit
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Assembler Language Structure Machin
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Assembler Language Structure Condit
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Terms, Literals, and Expressions Te
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Terms, Literals, and Expressions -
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Terms, Literals, and Expressions As
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Terms, Literals, and Expressions Se
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Terms, Literals, and Expressions Fo
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Terms, Literals, and Expressions I
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Page 62 and 63: Terms, Literals, and Expressions 1.
Page 64 and 65: Terms, Literals, and Expressions
Page 66 and 67: Terms, Literals, and Expressions
Page 68 and 69: Terms, Literals, and Expressions Th
Page 70 and 71: | Chapter 3. Program Structures and
Page 72 and 73: Source Module A source module is co
Page 74 and 75: The CSECT instruction can be used a
Page 76 and 77: | in linker control statements for
Page 78 and 79: This is not only convenient, but it
Page 80 and 81: | SECT_A CSECT , Define section SEC
Page 82 and 83: | For executable sections, the loca
Page 84 and 85: Addressing | The System/390® and z
Page 86 and 87: Addressing | Parts must always be r
Page 88 and 89: Addressing Literal Pools ALPHA LR 3
Page 90 and 91: Addressing If the symbol is the nam
Page 92 and 93: Addressing External Symbol Dictiona
Page 94 and 95: Addressing 74 HLASM V1R5 Language R
Page 96 and 97: Part 2. Machine and Assembler Instr
Page 98 and 99: General Instructions Chapter 4. Mac
Page 100 and 101: Input/Output Operations For further
Page 102 and 103: Branching with Extended Mnemonic Co
Page 104 and 105: Symbolic Operation Codes variations
Page 106 and 107: Operand Entries Registers You can s
Page 108 and 109: Operand Entries “Program Structur
Page 112 and 113: Examples of Coded Machine Instructi
Page 120 and 121: Chapter 5. Assembler Instruction St
Page 122 and 123: *PROCESS Statement *PROCESS Stateme
Page 124 and 125: ACONTROL Instruction ►►──
Page 126 and 127: ACONTROL Instruction FLAG(PAGE0) in
Page 128 and 129: AINSERT Instruction character_strin
Page 130 and 131: AMODE Instruction alias_string is t
Page 132 and 133: CATTR Instruction Figure 25. AMODE/
Page 134 and 135: CATTR Instruction | statements for
Page 136 and 137: CCW1 Instruction data_count is an a
Page 138 and 139: CEJECT Instruction If symbol is an
Page 140 and 141: CNOP Instruction Figure 29 (Page 2
Page 142 and 143: COPY Instruction In the following e
Page 144 and 145: CSECT Instruction symbol in the nam
Page 146 and 147: DC Instruction ROUTINE B GAMMA DXD
Page 148 and 149: DC Instruction duplication_factor c
Page 150 and 151: DC Instruction Figure 33 (Page 2 of
Page 152 and 153: DC Instruction With EBCDIC spaces
Page 154 and 155: DC Instruction Further information
Page 156 and 157: DC Instruction | Symbols used in su
Page 158 and 159: DC Instruction The length attribute
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DC Instruction Notes: 1. Don't conf
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DC Instruction—Character Constant
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DC Instruction—Character Constant
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DC Instruction—Graphic Constant r
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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 Constants
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DC Instruction—Address Constants
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DC Instruction—Address Constants
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DC Instruction—Offset Constant re
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DC Instruction—Length Constant Le
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DC Instruction—Hexadecimal Floati
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DC Instruction—Binary Floating-Po
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DC Instruction—Binary Floating-Po
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DROP Instruction DROP Instruction T
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DS Instruction USING DSECTA,14 ALBL
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DS Instruction The size of a storag
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DSECT Instruction DSECT Instruction
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DXD Instruction ASEMBLY2 CSECT USIN
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END Instruction change but no addit
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EQU Instruction EQU Instruction The
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EQU Instruction 5. The length attri
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EXITCTL Instruction sequence_symbol
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ISEQ Instruction must be greater th
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LOCTR Instruction A CSECT , See not
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LTORG Instruction If symbol is an o
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MNOTE Instruction When two literals
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OPSYN Instruction ,ERROR, SEV 1 An
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ORG Instruction AFTER is defined in
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ORG Instruction If you specify mult
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POP Instruction POP Instruction The
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PRINT Instruction Note: If the next
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Process Statement Process Statement
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REPRO Instruction NOPRINT instructs
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RSECT Instruction 4. AMODE or RMODE
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START Instruction START Instruction
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TITLE Instruction The name value is
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USING Instruction Only the characte
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USING Instruction Base Registers fo
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USING Instruction If register 0 is
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USING Instruction A variable symbo
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USING Instruction In this MVC instr
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USING Instruction Range of a Depend
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XATTR Instruction external_symbol i
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XATTR Instruction SCOPE ►►─
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XATTR Instruction 234 HLASM V1R5 La
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Part 3. Macro Language &SYSDATC Sys
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Introduction to Macro Language Chap
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Introduction to Macro Language The
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Introduction to Macro Language Macr
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MACRO and MEND Statements The assem
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Prototype Statement Macros that are
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Model Statements generated from tha
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Model Statements ▌5▐ ▌6▐
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Model Statements Notes: 1. You can
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Positional Parameters Symbolic para
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Processing Statements Processing St
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AREAD Instruction Assign Local Time
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COPY Instruction sequence_symbol is
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System Variable Symbols System Vari
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&SYSADATA_MEMBER System Variable Sy
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&SYSCLOCK System Variable Symbol &S
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&SYSECT System Variable Symbol depe
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&SYSIN_MEMBER System Variable Symbo
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&SYSJOB System Variable Symbol &SYS
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&SYSLIN_DSN System Variable Symbol
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&SYSLIST System Variable Symbol The
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&SYSLOC System Variable Symbol To
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&SYSM_SEV System Variable Symbol &S
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&SYSNDX System Variable Symbol The
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&SYSOPT_DBCS System Variable Symbol
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&SYSPARM System Variable Symbol Not
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&SYSPRINT_MEMBER System Variable Sy
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&SYSPUNCH_MEMBER System Variable Sy
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&SYSSTEP System Variable Symbol Not
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&SYSTERM_DSN System Variable Symbol
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&SYSTIME System Variable Symbol Not
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Macro Instruction Format sequence_s
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Macro Instruction Format Operand En
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Macro Instruction Format When you n
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Sublists in Operands the order in w
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Sublists in Operands &SYSLIST( n,m)
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Values in Operands Notes: 1. Spaces
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Values in Operands Parentheses In m
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Inner and Outer Macro Instructions
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Levels of Macro Call Nesting When t
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Levels of Macro Call Nesting System
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How to Write Conditional Assembly I
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SET Symbols SET Symbol Specificatio
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SET Symbols Figure 86 (Page 3 of 3)
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Data Attributes this example indica
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Data Attributes variable_symbol is
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Data Attributes The value of an att
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Data Attributes The following attri
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Data Attributes Assembler gives a t
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Data Attributes The scale attribute
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Data Attributes Number Attribute (N
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Data Attributes The operation code
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Lookahead MACRO &NAME MOVE &TO,&FRO
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Open Code Sequence Symbols The cond
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GBLA, GBLB, and GBLC Instructions G
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LCLA, LCLB, and LCLC Instructions s
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SETA Instruction expression is an a
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SETA Instruction | The logical-exp
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SETA Instruction | Figure 99 (Page
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SETA Instruction | The result of C2
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SETA Instruction NOT Format: Logica
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SETA Instruction | X2A Name Operati
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SETA Instruction In evaluating the
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SETB Instruction Any expression tha
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SETB Instruction ┌─────
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SETB Instruction | ISDEC | Format:
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SETB Instruction The two comparands
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SETC Instruction Notes: 1. The asse
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Figure 103. Substring Notation in C
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Loc Object Code Addr1 Addr2 Stmt So
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| B2C('111111') has value '3' | B2C
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| Output: D2B('decstring') converts
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SIGNED Format: Logical-expression,
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| X2D('') has value '+' | X2D('91')
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Concatenation of strings containing
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MACRO &NAME MOVE &TO,&FROM LCLC &PR
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SETAF Instruction Alternative State
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Branching Branching You can control
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AGO Instruction The extended AIF in
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ACTR Instruction AGOB—Synonym of
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ANOP Instruction statement processe
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MHELP Instruction MHELP B'10000000'
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400 HLASM V1R5 Language Reference
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Assembler Instructions and Statemen
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Summary of Constants Figure 113. Su
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Macro and Conditional Assembly Lang
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Standard Character Set Code Table H
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Standard Character Set Code Table H
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Trademarks AIX BookMaster CICS DFSM
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Bibliography SMP/E Reference, SC28-
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Index A2C (SETC built-in function)
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Index B B-type binary constant 141
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Index conditional assembly instruct
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Index elements of conditional assem
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Index instructions (continued) asse
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Index machine instruction statement
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Index operands (continued) compatib
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Index relative addressing 67 reloca
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Index sublists compatibility with A
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Index variable symbols (continued)
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Readers' Comments High Level Assemb
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IBM® Program Number: 5696-234 Prin
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