dbreg
#define dbreg(xx) ((long *)(xx))
#define dbreg(xx) (long *)offsetof(db_regs_t, tf_ ## xx)
struct dbreg {
#define dbreg(xx) (long *)offsetof(db_regs_t, tf_ ## xx)
struct dbreg {
struct dbreg {
#define dbreg(xx) (long *)offsetof(db_regs_t, db_tf.tf_ ## xx)
#define dbreg(xx) (long *)offsetof(db_regs_t, db_tf.tf_ ## xx)
struct dbreg {