HLASM Language Reference

CXD Instruction
The source statements following a CSECT instruction that either initiate or indicate
the continuation of a control section are assembled into the object code of the
control section identified by that CSECT instruction.
The end of a control section or portion of a control section is marked by:
Any instruction that defines a new or continued control section
The END instruction
The CSECT instruction may interact with any LOCTR instructions that are present.
For more information about this interaction, see “LOCTR Instruction” on page 191.
CXD Instruction
The CXD instruction reserves a fullword area in storage. The linker or loader
inserts into this area the total length of all external dummy sections specified in the
source modules that are assembled and linked into one program. If a control
section has not previously been established, CXD will initiate an unnamed (private)
control section.
►►──┬────────┬──CXD────────────────────────────────────────────────►◄
└─symbol─┘
symbol
is one of the following:
An ordinary symbol
A variable symbol that has been assigned a character string with a value
that is valid for an ordinary symbol
A sequence symbol
The linker or loader inserts into the fullword-aligned fullword area reserved by the
CXD instruction the total length of storage required for all the external dummy
sections specified in a program. If the GOFF assembler option is specified, CXD
returns the length of the B_PRV class. If symbol denotes an ordinary symbol, the
ordinary symbol represents the address of the fullword area. The ordinary symbol
denoted by symbol has a length attribute value of 4.
The following examples shows how external dummy sections may be used:
ROUTINE A
ALPHA DXD 2DL8
BETA DXD 4FL4
OMEGA CXD
.
.
DC
Q(ALPHA)
DC
Q(BETA)
.
.
Chapter 5. Assembler Instruction Statements 125