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(nasm.info)Section 7.5.3

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7.5.3. Using `c16.mac' With Pascal Programs
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   The `c16.mac' macro package, described in *Note Section 7.4.5::, can
also be used to simplify writing functions to be called from Pascal
programs, if you code `%define PASCAL'. This definition ensures that
functions are far (it implies `FARCODE'), and also causes procedure
return instructions to be generated with an operand.

   Defining `PASCAL' does not change the code which calculates the
argument offsets; you must declare your function's arguments in reverse
order. For example:

     %define PASCAL
     
     proc    _pascalproc
     
     %$j     arg 4
     %$i     arg
             mov     ax,[bp + %$i]
             mov     bx,[bp + %$j]
             mov     es,[bp + %$j + 2]
             add     ax,[bx]
     
     endproc

   This defines the same routine, conceptually, as the example in *Note
Section 7.4.5::: it defines a function taking two arguments, an integer
and a pointer to an integer, which returns the sum of the integer and
the contents of the pointer. The only difference between this code and
the large-model C version is that `PASCAL' is defined instead of
`FARCODE', and that the arguments are declared in reverse order.