HLASM Language Reference

DC Instruction—Address Constants
USING ,15
DC 2S() generates FF2
LA 1,=2S() generated constants are F4F4
Note that this behavior is different from that in A-type address constants and
Y-type address constants.
Figure 45. S Address Constants
Subfield Value Example Result
1. Duplication factor Allowed
2. Type S
3. Type Extension Not allowed
| 4. Program type Allowed
5. Modifiers
Implicit length:
(length modifier
not present)
Alignment:
(Length modifier
not present)
Range for length:
Range for scale:
Range for exponent:
6. Nominal value
Represented by:
2 bytes
Halfword
2 only
(no bit length)
Not allowed
Not allowed
Absolute or
relocatable
expression ▌1▐
DC S(RELOC)
DC S(124)
Base Disp
X YYY
0 400
Enclosed by:
Exponent allowed:
Number of values
per operand:
Padding:
Truncation of
assembled value:
Two absolute
expressions ▌2▐
Parentheses
No
Multiple
Not applicable
Not applicable
DC S(512(12))
C 200
Address Constant—V: The V-type constant reserves storage for the address of a
location in a control section that is defined in another source module. Use the
V-type address constant only to branch to an external address, because link-time
processing may cause the branch to be indirect (for example, an assisted linkage in
an overlay module). That is, the resolved address in a V-type address constant
might not contain the address of the referenced symbol. In contrast, to refer to
external data you should use an A-type address constant whose nominal value
specifies an external symbol identified by an EXTRN instruction.
Because you specify a symbol in a V-type address constant, the assembler
assumes that it is an external symbol. A value of zero is assembled into the space
Chapter 5. Assembler Instruction Statements 157