360 Assembly/360 Instructions/ORG

ORG Pseudo instruction - Set value of program counter

The ORG pseudo instruction tells the assembler to set the value of the location counter to the specified address, or to reset the location counter if altered by a prior ORG.

Format

Name	Operation	Operands
	ORG	[expr]
[name]	ORG	[expr]
[.symbol]	ORG	[expr]

where

name is an optional defined symbol

or

.symbol is an optional conditional assembly label

and

expr is an optional relocatable address within the current control section

Description

The ORG pseudo instruction alters the location counter of this control section (the current CSECT, DSECT, or START). If name is specified, the address is adjusted to the value of the previously defined symbolname. If expr is specified, it must not be lower than the lowest address defined for this control section. An ORG statement without an expr value resets the location counter to the highest address used in the current control section.

Examples

PRNTLINE DS   CL131     CREATE A PRINT BUFFER
         ORG  PRNTLINE
CTLCHR   DS   C         THIS OCCUPIES THE SAME ADDRESS AS
*                       THE FIRST BYTE OF PRNTLINE
LASTNAME DS   CL15      OCCUPIES THE SAME ADDRESS AS BYTES 2-16 OF PRNTLINE
         DS   C
FRSTNAME DS   CL10
         DS   C
ACCOUNT  DS   CL8
         ORG           , RESET TO NEXT BYTE AFTER PRNTLINE

The comma on the last line is used to be sure the assembler does not presume the first word of the comment is interpreted as an argument to that ORG statement