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STAB - Global Variable Descriptions
STAB directives are used to provide debugger symbol table
information about global variables defined in the source program.
The word "GLOBVAR" is used as the first argument of such a directive.
The second argument must be a quoted string specifying the variables
name. The third and fourth arguments are specified using a keyword
format. The third argument must be of the form OFFSET=n where
n is an integer constant specifying the offset to the storage used
to hold the variable's value from the base of the global variable area.
The fourth argument must be of the form TYPE="type-string"
where "type-string" specifies the variables type.