Fix nacl-gdb so that it can read ELF core dump files

gdb/nacl-tdep.c

 /* Target-dependent code for NaCl.
 
    Copyright (C) 2001, 2003-2012 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.
@@ skipping 51 matching lines @@
   set_gdbarch_process_record (gdbarch, i386_process_record);
   set_gdbarch_call_dummy_location(gdbarch, AT_ENTRY_POINT);
 }
 
 static void
 i386_nacl_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
   linux_init_abi (info, gdbarch);
   i386_elf_init_abi (info, gdbarch);
+  i386_linux_init_gregset (tdep);
   tdep->tdesc = tdesc_i386_linux;
   set_solib_svr4_fetch_link_map_offsets (gdbarch,
                                          svr4_ilp32_fetch_link_map_offsets);
   nacl_init_abi (info, gdbarch);
 }
 
 static CORE_ADDR
 amd64_nacl_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR val)
 {
   return val & 0xffffffffUL;
@@ skipping 101 matching lines @@
   return frame_id_build (fp, get_frame_pc (this_frame));
 }
 
 static void
 amd64_nacl_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
   linux_init_abi (info, gdbarch);
   amd64_init_abi (info, gdbarch);
+  amd64_linux_init_gregset (tdep);
   tdep->tdesc = tdesc_amd64_linux;
   set_solib_svr4_fetch_link_map_offsets (gdbarch,
                                          amd64_nacl_fetch_link_map_offsets);
   nacl_init_abi (info, gdbarch);
 
   /* NaCl data model.
 
      WARNING! This might confuse a lot of code, as it uses
        if (set_gdbarch_ptr_bit (gdbarch) == <bits>)
      to distinguish between i386 and x86_64 (lame!).  Luckily, most of that
@@ skipping 29 matching lines @@
 {
   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
                                   nacl_osabi_sniffer);
 
   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
                           GDB_OSABI_NACL, amd64_nacl_init_abi);
 
   gdbarch_register_osabi (bfd_arch_i386, 0,
                           GDB_OSABI_NACL, i386_nacl_init_abi);
 }