HLASM: V1R6 Language Ref

Part 2. Machine and assembler instruction statements|Chapter 4. Machine instruction statements . . . 75General instructions . . . . . . . . . . .75Decimal instructions . . . . . . . . . . .75Floating-point instructions . . . . . . . . .76Control instructions . . . . . . . . . . .76Input/output operations . . . . . . . . . .76Branching with extended mnemonic codes . . . .77Alternative mnemonics for some branch relativeinstructions . . . . . . . . . . . . .80Statement formats . . . . . . . . . . . .80Symbolic operation codes . . . . . . . . . .81Operand entries . . . . . . . . . . . . .82Registers . . . . . . . . . . . . . .83Register usage by machine instructions . . .83Register usage by system . . . . . . . .84Addresses . . . . . . . . . . . . . .84Implicit address . . . . . . . . . . .85Explicit address . . . . . . . . . . .85Relative address . . . . . . . . . . .85Relocatability of addresses . . . . . . .85Machine or object code format . . . . . .86Lengths . . . . . . . . . . . . . . .86Immediate data . . . . . . . . . . . .87Examples of coded machine instructions . . . . .87RI format . . . . . . . . . . . . . .88RR format . . . . . . . . . . . . . .89RS format . . . . . . . . . . . . . .90RSI format . . . . . . . . . . . . . .91RX format . . . . . . . . . . . . . .91SI format . . . . . . . . . . . . . .92SS format . . . . . . . . . . . . . .93Chapter 5. Assembler instruction statements . . 9764-bit Addressing Mode . . . . . . . . . .98*PROCESS statement . . . . . . . . . . .98ACONTROL instruction . . . . . . . . . . 100ADATA instruction . . . . . . . . . . . 106AINSERT instruction . . . . . . . . . . . 106ALIAS instruction . . . . . . . . . . . . 108AMODE instruction . . . . . . . . . . . 109CATTR instruction (z/OS and CMS) . . . . . . 111CCW and CCW0 instructions . . . . . . . .113CCW1 instruction . . . . . . . . . . . .115CEJECT instruction . . . . . . . . . . .116CNOP instruction . . . . . . . . . . . .117COM instruction . . . . . . . . . . . .119COPY instruction . . . . . . . . . . . . 120CSECT instruction . . . . . . . . . . . . 122CXD instruction . . . . . . . . . . . . 123DC instruction . . . . . . . . . . . . . 125Rules for DC operands . . . . . . . . . 127General information about constants . . . . 127Length attribute value of symbols namingconstants . . . . . . . . . . . . . 127Alignment of constants . . . . . . . . 128Padding and truncation of values . . . . . 130||||Padding . . . . . . . . . . . . . 130Truncation . . . . . . . . . . . . 130Subfield 1: Duplication Factor . . . . . . . 131Subfield 2: Type . . . . . . . . . . . 132Subfield 3: Type Extension . . . . . . . . 133Subfield 4: Program type . . . . . . . . 134Subfield 5: Modifier . . . . . . . . . . 134Length modifier . . . . . . . . . . 135Scale modifier . . . . . . . . . . . 137Exponent modifier . . . . . . . . . . 138Subfield 6: Nominal Value . . . . . . . . 138Binary constant—B . . . . . . . . . 140Character constant—C . . . . . . . . 140Graphic constant—G . . . . . . . . . 144Hexadecimal constant—X . . . . . . . 145Fixed-point constants—F and H . . . . . 146Decimal constants—P and Z . . . . . . 149Address constants . . . . . . . . . . 151Offset and length constants . . . . . . . 157Hexadecimal floating-point constants—E, EH,D, DH, L, LH, LQ . . . . . . . . . . 159Binary floating-point constants—EB, DB, LB 165Decimal floating-point constants—ED, DD,LD . . . . . . . . . . . . . . . 166Syntax of binary, decimal, and hexadecimalfloating-point constants . . . . . . . . 166Floating-point special values . . . . . . 169Literal constants . . . . . . . . . . 170DROP instruction . . . . . . . . . . . . 171Labeled USING . . . . . . . . . . . 172Dependent USING . . . . . . . . . . 172DS instruction . . . . . . . . . . . . . 173Bytes skipped for alignment . . . . . . . 175How to use the DS instruction . . . . . . . 175To reserve storage . . . . . . . . . . 175To force alignment . . . . . . . . . . 175To name fields within an area . . . . . . 176DSECT instruction . . . . . . . . . . . . 177DXD instruction . . . . . . . . . . . . 179EJECT instruction . . . . . . . . . . . . 180END instruction . . . . . . . . . . . . 181ENTRY instruction . . . . . . . . . . . 182EQU instruction . . . . . . . . . . . . 183Using conditional assembly values . . . . . 186EXITCTL instruction . . . . . . . . . . . 186EXTRN instruction . . . . . . . . . . . 188ICTL instruction . . . . . . . . . . . . 189ISEQ instruction . . . . . . . . . . . . 189LOCTR instruction . . . . . . . . . . . 190LTORG instruction . . . . . . . . . . . 192Literal pool . . . . . . . . . . . . . 193Addressing considerations . . . . . . . . 194Duplicate literals . . . . . . . . . . . 194MNOTE instruction . . . . . . . . . . . 195Remarks . . . . . . . . . . . . . . 196OPSYN instruction . . . . . . . . . . . 197© Copyright IBM Corp. 1982, 2008 73