Symbols
3-19
Assembler Description
3.8.3
Defining Symbolic Constants (–d Option)
The –d option equates a constant value with a symbol. The symbol can then
be used in place of a value in assembly source. The format of the –d option
is as follows:
asm500
–d
name=[value ]
The
name is the name of the symbol you want to define. The value is the value
you want to assign to the symbol. If the
value is omitted, the symbol is set to 1.
Within assembler source, you may test the symbol with the following direc-
tives:
Type of Test
Directive Usage
Existence
.if $isdefed(”
name”)
Nonexistence
.if $isdefed(”
name”) = 0
Equal to value
.if
name = value
Not equal to value
.if
name != value
Note that the argument to the $isdefed built-in function must be enclosed in
quotes. The quotes cause the argument to be interpreted literally rather than
as a substitution symbol.
3.8.4
Predefined Symbolic Constants
The assembler has several predefined symbols, including the following:
-
$, the dollar sign character, represents the current value of the section
program counter (SPC).
-
Register symbols, including AR0 – AR7
-
Symbols that are defined by using the .mmregs directive (see Table 4–2
on page 4-70 for a list of registers)
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