🚀 go-pugleaf

I'm porting some assembly source which works with an Intel
assembler to a sun running gas, and I've run into a slight
problem.

The Intel assembler has a directive which looks like

    define(base_addr,r0)     ; register r0

and simply does a macro substitution of the string
"base_addr" with r0 at compile time.  It does not do 
anything fancy (e.g. protect r0).

I can't find such a beast in the "Using GAS" section of the
GCC manual.  Does anyone know if this type of macro exists
under gas?  I've always got the option of editting the file
and making the substitutions, but I'd like to avoid losing
the original author's desired readibility.

Thanks in advance for any help/tips.

Sal