* Makefile.in (ALL_64_TARGET_OBS): Add amd64-dicos-tdep.o.

(ALL_TARGET_OBS): Add dicos-tdep.o.
	(ALLDEPFILES): Add amd64-dicos-tdep.c and dicos-tdep.c.
	* configure.tgt (i[34567]86-*-dicos*): Add dicos-tdep.o to
	gdb_target_obs.
	(x86_64-*-dicos*): Add dicos-tdep.o and amd64-dicos-tdep.o to
	gdb_target_obs.
	* dicos-tdep.h, dicos-tdep.c: New.
	* amd64-dicos-tdep.c: New.
	* i386-dicos-tdep.c: Don't include solib.h, solib-target.h or
	inferior.h.  Include dicos-tdep.h.
	(i386_dicos_init_abi): Call dicos_init_abi.
	(i386_dicos_bfd_has_symbol_p): Delete.
	(i386_dicos_osabi_sniffer): Use dicos_load_module_p.

	* NEWS: Mention x86-64 DICOS target support.

gdb/dicos-tdep.c

@@ -0,0 +1,113 @@
+/* Target-dependent, architecture-independent code for DICOS, for GDB.
+
+   Copyright (C) 2009 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.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "defs.h"
+#include "osabi.h"
+#include "gdb_string.h"
+#include "solib.h"
+#include "solib-target.h"
+#include "inferior.h"
+#include "dicos-tdep.h"
+
+void
+dicos_init_abi (struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  set_solib_ops (gdbarch, &solib_target_so_ops);
+
+  /* Every process, although has its own address space, sees the same
+     list of shared libraries.  */
+  set_gdbarch_has_global_solist (gdbarch, 1);
+
+  /* There's no (standard definition of) entry point or a guaranteed
+     text location with a symbol where to place the call dummy, so we
+     put it on the stack.  */
+  set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
+
+  /* DICOS rewinds the PC itself.  */
+  set_gdbarch_decr_pc_after_break (gdbarch, 0);
+}
+
+/* Return true if ABFD is a dicos load module.  HEADER_SIZE is the
+   expected size of the "header" section in bytes.  */
+
+int
+dicos_load_module_p (bfd *abfd, int header_size)
+{
+  long storage_needed;
+  int ret = 0;
+  asymbol **symbol_table = NULL;
+  const char *symname = "Dicos_loadModuleInfo";
+  asection *section;
+
+  /* DICOS files don't have a .note.ABI-tag marker or something
+     similar.  We do know there's always a "header" section of
+     HEADER_SIZE bytes (size depends on architecture), and there's
+     always a "Dicos_loadModuleInfo" symbol defined.  Look for the
+     section first, as that should be cheaper.  */
+
+  section = bfd_get_section_by_name (abfd, "header");
+  if (!section)
+    return 0;
+
+  if (bfd_section_size (abfd, section) != header_size)
+    return 0;
+
+  /* Dicos LMs always have a "Dicos_loadModuleInfo" symbol
+     defined.  Look for it.  */
+
+  storage_needed = bfd_get_symtab_upper_bound (abfd);
+  if (storage_needed < 0)
+    {
+      warning (_("Can't read elf symbols from %s: %s"), bfd_get_filename (abfd),
+	       bfd_errmsg (bfd_get_error ()));
+      return 0;
+    }
+
+  if (storage_needed > 0)
+    {
+      long i, symcount;
+
+      symbol_table = xmalloc (storage_needed);
+      symcount = bfd_canonicalize_symtab (abfd, symbol_table);
+
+      if (symcount < 0)
+	warning (_("Can't read elf symbols from %s: %s"),
+		 bfd_get_filename (abfd),
+		 bfd_errmsg (bfd_get_error ()));
+      else
+	{
+	  for (i = 0; i < symcount; i++)
+	    {
+	      asymbol *sym = symbol_table[i];
+	      if (sym->name != NULL
+		  && symname[0] == sym->name[0]
+		  && strcmp (symname + 1, sym->name + 1) == 0)
+		{
+		  ret = 1;
+		  break;
+		}
+	    }
+	}
+    }
+
+  xfree (symbol_table);
+  return ret;
+}