macro strlen val {
    virtual at 0
        db val
        strlenr = $
    end virtual
}
macro someshit [val] {
    virtual at 0
    forward
        strlen val
        db strlenr
        db val
    common
        load len from 0
        display len+30h
    end virtual
}

someshit "abc","def","bbb","zzz","yyy"    

include '%finc%/macro/display.inc'

macro someshit [val] {
    common       ; Here is the problem.
    virtual at 0
    forward
        strlen val
        db strlenr
        db val
    common
        load len from 0
        display len+30h
    end virtual
}