* xm-sun2.h (ATTACH_DETACH, FETCH_INFERIOR_REGISTERS, REGISTER_U_ADDR): removed to nm-sun2.h. * nm-sun2.h: new file. * config/sun2os[34].mh (XDEPFILES): infptrace.o inftarg.o fork-child.o sun3-xdep.o removed. (NAT_FILE, NATDEPFILES): new macros.