fill_dbregs
err = fill_dbregs(td, &dr);
return (fill_dbregs(td, dbregs));
int fill_dbregs(struct thread *, struct dbreg *);
#define fill_dbregs32(td, reg) fill_dbregs(td,(struct dbreg *)reg)
int fill_dbregs(struct thread *, struct dbreg *);
fill_dbregs(NULL, d);
fill_dbregs(NULL, d);
fill_dbregs(NULL, &d);