A macro definition looks like this:
name macro arg1, arg2, ...
text
end macro
or
name macro arg1, arg2, ...
text
name end macro
The above code blocks define a macro name with arguments arg1, arg2, ... A macro may have no arguments at all. Names of macro arguments work as the names of local symbols usable within the macro.
If a macro has a long list of arguments, you can split the list into multiple lines. To indicate that a line of a list of arguments continues on the next line, terminate a continued line with a comma after the name of an argument. The following example demonstrates this:
mac1 macro arg1, arg2, arg3,
arg4, arg5, arg6,
arg7, arg8
...
mac1 end macro
You may not define nested macros. However, a macro can expand another macro expanding another macro and so on. The maximum supported nesting level of macro expansions is 65535.
To expand a macro name defined earlier in a source text and use arg1, arg2, … for values of macro arguments, write a line like this:
name arg1, arg2, ...
The name of an expanded macro must be on a line of its own. The line must begin with either at least one whitespace character followed by a macro name or a location label definition followed by at least one whitespace character and a macro name.
The assembler preprocessor does not perform substitutions of symbol names with symbol values in names of expanded macros. However, the preprocessor performs such substitutions in values of macro arguments. After substituting, the value of every macro argument must reduce to either a string literal or other text without string literals, spaces, and commas.
If you are expanding a macro using a long list of arguments, you can split the list into multiple lines. To indicate that a line of a list of arguments continues on the next line, terminate a continued line with a comma after the value of an argument. The following example demonstrates this:
mac1 "alpha", 0.1,
"beta", 0.2,
"gamma", 0.3,
"delta", 0.4