* s390-nat.c (SUBOFF): New macro.
(supply_gregset, fill_gregset): Use it to handle debugging
of 32-bit exectuables running under a 64-bit kernel.
* s390-tdep.c: Include "solib-svr4.h".
(s390_svr4_fetch_link_map_offset): New function.
(s390x_svr_fetch_link_map_offset): Likewise.
(s390_gdbarch_init): Call set_solib_svr4_fetch_link_map_offsets.
* Makefile.in (s390-tdep.o): Update dependencies.