Simple Relocatable Expressions

Simple relocatable expressions contain symbols that are defined in a relocatable segment. Segment and external symbols are not allowed in simple relocatable expressions.

Simple relocatable expression may be used in four contexts:

1. As an operand to the ORG directive.
2. As an operand to a symbol definition directive (i.e. EQU, SET).
3. As an operand to a data initialization directive (DB or DW).
4. As an operand to a machine instruction.

Examples for simple relocatable expressions

REL1 + ABS1 * 10
REL2   ABS1
REL1 + (REL2   REL3)    assuming REL2 and REL3 refer to the same segment.

Invalid form of simple relocatable expressions

(REL1 + ABS1) * 10    relocatable value may not be multiplied.
(EXT1   ABS1)         this is a general relocatable expression
REL1 + REL2           you cannot add relocatable symbols.