360 Assembly/Pseudo Instructions

360 Assembly

Pseudo Instructions are special commands to the assembler about the positioning of the program, the address the program should presumed to be assembled at, the name of the module, data declarations, the title and printing options for the program, defining and calling macros, macro looping and test, and end of source code. Unless a machine instruction is issued, these do not generate executable code.

The pseudo instructions varied from version to version of the assembler, and higher-level and more powerful assemblers provided for all of the instructions. All pseudo instructions are 2-5 letters in length. The following lists the general pseudo instructions available. Some pseudo instructions are used for conditional assembly or macro processing, and some are only available while processing a macro.

*PROCESS - Special processing options
ACONTROL - Change assembler options and controls
ACTR - Limit AIF/AGO branch counts in macros
ADATA - Writes information to the ADATA file
AGO - Conditional transfer of assembly
AIF - Conditional test at assembly time
AINSERT - Insert records into input stream
ALIAS - Supply alternate name for external symbol
AMODE - Declare addressing mode
ANOP - Assembly no-op
AREAD - Read from input stream
CATTR - Specify a class name and attributes
CCW - specify 8-byte, 24-bit address I/O instruction
CCW0 - Same as CCW
CCW1 - Specify 8-byte, 31-bit address I/O instruction
CEJECT - Conditional ejecf
CNOP = Conditional no-op
COM - Declare common control section
COPY - Include code
CSECT - Declare a control section
CXD - Return total external dummy section size
DC - Declare a constant value
DROP - Discontinue use of an addressing register
DS - Declare name for a storage location
DSECT - Declare a dummy section
DXD - Define external dummy section
EJECT - Skip to next page on listing
END - Declare end of an assembly
ENTRY - Declare a public entry point
EQU - Declare a symbol
EXITCTL - Set values to pass to certain user exits
EXTRN - Declare a strong (required) external symbol
GBLA / GBLB / GBLC - declare a global symbol for a macro
ICTL - Declare source code column margins
ISEQ - Validate sequence numbers
LCLA / LCLB / LCLC - declare a local symbol for a macro
LOCTR - Specify multiple location counters
LTORG - Generate all literals
MACRO - Declare the start of a macro
MEND - Declare the end of a macro
MEXIT - Declare the termination of processing of a macro
MNOTE - Declare error (or warning) in a macro
OPSYN - Define or delete an op code
ORG - Set current location counter value
POP - Restore PRINT settings
PRINT - Declare listing conditions
PUNCH - Add information to object output
PUSH - Save current PRINT settings
REPRO - Copy next card to object file without translation
RMODE - Declare real addressing mode
RSECT - Declare a read=only CSECT
SETA / SETB / SETC - declare value of a conditional symbol
SPACE - Generate blank lines in listing
TITLE - Add a title to a listing
START - Declare the start of a control section
USING - Declare addressing registers
WXTRN - Declare weak (optional) external symbol
XATTR - Assign attributes to an external symbol
Comments - Programmer remarks about the program

360 Assembly Language
360 Family	Introduction · Basic FAQ · 360 Family · 360 Architecture
360 Instruction Set	360 Instructions · Branch Instructions · Data Transfer Instructions · Control Flow Instructions · Arithmetic Instructions · Logic Instructions · Shift and Rotate Instructions · Priveleged Instructions · Other Instructions
Syntaxes and Assemblers	360 Assemblers· Pseudo Instructions
Instruction Extensions	Floating Point · High-Level Languages