HLASM: V1R6 Language Ref

Terms, literals, and expressionsAssembler Language │ Address Value │ Object CodeStatements │ of Symbol │ in Hexadecimal─────────────────────────┼─────────────────┼──────────────────────────────────│ Relocatable │ ┌────── Address│ │ of AREA│ │ ┌──┬─┬─┬────┐LOAD L 3,AREA ▌1▐ LOAD ──────────┼────►│58│3│0│xxxx││ │ └──┴─┴─┴────┘│││ │ ┌───────────┐AREA DS F ▌2▐ AREA ──────────┼────►│xx x x xxxx││ ┌──────┼────►└───────────┘│ │ ││ │ │ ┌───────────┐F200 DC F’200’ ▌3▐ F200 ──────────┼────►│00 0 0 00C8││ │ ┌──┼────►└───────────┘─────────────────────────┼──────────┼───┼──┼───────────────────────────────────FULL EQU AREA │ FULL ───┘ │ │▌4▐ │ │TW00 EQU F200 │ TW00 ───────┘ │─────────────────────────┼─────────────────┼───────────────────────────────────│ Absolute │││R3 EQU 3 ▌5▐ R3=3 │ ┌────── Address│ │ of FULL│ │ ┌──┬─┬─┬────┐L R3,FULL │ │ │58│3│0│xxxx││ │ ├──┼─┼─┼────┤A R3,TW00 │ │ │5A│3│0│xxxx││ │ └──┴─┴─┴────┘│ │ Address│ │ └────── of TW00Figure 8. Transition from assembler language statement to object codeRestrictions on symbols: A symbol must be defined only once in a sourcemodule with one or more control sections, with the following exceptions:v The symbol in the name field of a CSECT, RSECT, DSECT, or COM instructioncan be the same as the name of previous CSECT, RSECT, DSECT, or COMinstruction, respectively. It identifies the resumption of the control sectionspecified by the name field.z/VM and z/OSv The symbol in the name field of a CATTR instruction can be the same as thename of a previous CATTR instruction. It identifies the resumption of the classspecified by the name field.End of z/VM and z/OSv The symbol in the name field of a LOCTR instruction can be the same as thename of a previous START, CSECT, RSECT, DSECT, COM, or LOCTRinstruction. It identifies the resumption of the location counter specified by thename field.v The symbol in the name field of a labeled USING instruction can be the same asthe name of a previous labeled USING instruction. It identifies the terminationof the domain of the previous labeled USING instruction with the specifiedname.Chapter 2. Coding and structure 31