[Linux-ia64] Offsets from C struct into assembler

Hi!

Does anyone know how to bring offsets from a C structure into pure
assembly code (not inline-asm)?
I want to do something like:

struct abc {
    ...
    long varx;
    ...
    }

add rx=offset(varx),ry    // get address of variable
ld8 rx=[rx]                    // get variable varx

with ry being the base address of the structure abc and offset_varx
beeing compiled from struct abc.

Any ideas are welcome.

Christian