* configure.tgt: Add i[34567]86-*-dicos* and x86_64-*-dicos*.

(i[34567]86-*-dicos*, x86_64-*-dicos*):
	Set gdb_osabi to GDB_OSABI_DICOS.

	* defs.h (enum gdb_osabi): Add GDB_OSABI_DICOS.
	* osabi.c (gdb_osabi_name): Add "DICOS".

	* i386-dicos-tdep.c: New file.

	* Makefile.in (ALL_TARGET_OBS): Add i386-dicos-tdep.o.
	(ALLDEPFILES): Add i386-dicos-tdep.c.
	(i386-dicos-tdep.o): New rule.

gdb/ChangeLog

@@ -1,3 +1,18 @@
+2008-05-01  Pedro Alves  <pedro@codesourcery.com>
+
+	* configure.tgt: Add i[34567]86-*-dicos* and x86_64-*-dicos*.
+	(i[34567]86-*-dicos*, x86_64-*-dicos*):
+	Set gdb_osabi to GDB_OSABI_DICOS.
+
+	* defs.h (enum gdb_osabi): Add GDB_OSABI_DICOS.
+	* osabi.c (gdb_osabi_name): Add "DICOS".
+
+	* i386-dicos-tdep.c: New file.
+
+	* Makefile.in (ALL_TARGET_OBS): Add i386-dicos-tdep.o.
+	(ALLDEPFILES): Add i386-dicos-tdep.c.
+	(i386-dicos-tdep.o): New rule.
+
 2008-05-01  Pedro Alves  <pedro@codesourcery.com>
 
 	* linux-nat.c (linux_nat_switch_fork): Reinit GDB's thread list

gdb/Makefile.in

@@ -464,6 +464,7 @@ ALL_TARGET_OBS = \
 	i386bsd-tdep.o i386-cygwin-tdep.o i386fbsd-tdep.o i386gnu-tdep.o \
 	i386-linux-tdep.o i386nbsd-tdep.o i386-nto-tdep.o i386obsd-tdep.o \
 	i386-sol2-tdep.o i386-tdep.o i387-tdep.o \
+	i386-dicos-tdep.o \
 	iq2000-tdep.o \
 	m32c-tdep.o \
 	m32r-linux-tdep.o m32r-tdep.o \
@@ -1572,6 +1573,7 @@ ALLDEPFILES = \
 	i386bsd-nat.c i386bsd-tdep.c i386fbsd-nat.c i386fbsd-tdep.c \
 	i386nbsd-nat.c i386nbsd-tdep.c i386obsd-nat.c i386obsd-tdep.c \
 	i387-tdep.c \
+	i386-dicos-tdep.c \
 	i386-linux-tdep.c i386-nat.c \
 	i386-sol2-nat.c i386-sol2-tdep.c \
 	i386gnu-nat.c i386gnu-tdep.c \
@@ -2235,6 +2237,8 @@ i386bsd-tdep.o: i386bsd-tdep.c $(defs_h) $(arch_utils_h) $(frame_h) \
 i386-cygwin-tdep.o: i386-cygwin-tdep.c $(defs_h) $(osabi_h) $(gdb_string_h) \
 	$(i386_tdep_h) $(regset_h) $(gdb_obstack_h) $(xml_support_h) \
 	$(gdbcore_h) $(solib_h) $(solib_target_h) $(i386_cygwin_tdep_h)
+i386-dicos-tdep.o: i386-dicos-tdep.c $(defs_h) $(osabi_h) $(gdb_string_h) \
+	$(solib_h) $(solib_target_h)
 i386fbsd-nat.o: i386fbsd-nat.c $(defs_h) $(inferior_h) $(regcache_h) \
 	$(target_h) $(fbsd_nat_h) $(i386_tdep_h) $(i386bsd_nat_h) \
 	$(bsd_kvm_h)

gdb/configure.tgt

@@ -145,6 +145,12 @@ hppa*-*-*)
 	gdb_target_obs="hppa-tdep.o"
 	;;
 
+i[34567]86-*-dicos*)
+	# Target: DICOS/i386
+	gdb_target_obs="i386-tdep.o i387-tdep.o \
+			i386-dicos-tdep.o \
+			corelow.o solib.o solib-target.o"
+	;;
 i[34567]86-*-freebsd* | i[34567]86-*-kfreebsd*-gnu)
 	# Target: FreeBSD/i386
 	gdb_target_obs="i386-tdep.o i387-tdep.o i386bsd-tdep.o i386fbsd-tdep.o \
@@ -491,6 +497,12 @@ vax-*-*)
 	gdb_target_obs="vax-tdep.o"
 	;;
 
+x86_64-*-dicos*)
+	# Target: DICOS/x86-64
+	gdb_target_obs="amd64-tdep.o i386-tdep.o i387-tdep.o \
+			i386-dicos-tdep.o \
+			corelow.o solib.o solib-target.o"
+	;;
 x86_64-*-linux*)
 	# Target: GNU/Linux x86-64
 	gdb_target_obs="amd64-tdep.o amd64-linux-tdep.o i386-tdep.o \
@@ -542,4 +554,5 @@ m68*-*-openbsd* | m88*-*-openbsd* | vax-*-openbsd*) ;;
 *-*-mingw32ce*)	gdb_osabi=GDB_OSABI_WINCE ;;
 *-*-mingw* | *-*-cygwin*)
 		gdb_osabi=GDB_OSABI_CYGWIN ;;
+*-*-dicos*)	gdb_osabi=GDB_OSABI_DICOS ;;
 esac

gdb/defs.h

@@ -924,6 +924,7 @@ enum gdb_osabi
 
   GDB_OSABI_CYGWIN,
   GDB_OSABI_AIX,
+  GDB_OSABI_DICOS,
 
   GDB_OSABI_INVALID		/* keep this last */
 };

gdb/i386-dicos-tdep.c

@@ -0,0 +1,115 @@
+/* Target-dependent code for DICOS running on i386's, for GDB.
+
+   Copyright (C) 2008 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"
+
+static void
+i386_dicos_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  set_solib_ops (gdbarch, &solib_target_so_ops);
+}
+
+/* Look in the elf symbol table of ABFD for a symbol named WANTED.
+   Return true if found.  */
+static int
+i386_dicos_bfd_has_symbol_p (bfd *abfd, const char *wanted)
+{
+  long storage_needed;
+  int ret = 0;
+  asymbol **symbol_table = NULL;
+
+  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
+		  && wanted[0] == sym->name[0]
+		  && strcmp (wanted + 1, sym->name + 1) == 0)
+		{
+		  ret = 1;
+		  break;
+		}
+	    }
+	}
+    }
+
+  xfree (symbol_table);
+  return ret;
+}
+
+static enum gdb_osabi
+i386_dicos_osabi_sniffer (bfd *abfd)
+{
+  char *target_name = bfd_get_target (abfd);
+
+  /* DICOS debug info files don't have a .note.ABI-tag marker or
+     something similar.  We do know there's always a "header" section
+     of 36 bytes, and there's always a "Dicos_loadModuleInfo" symbol
+     defined.  Look for the section first, as that should be
+     cheaper.  */
+  if (strcmp (target_name, "elf32-i386") == 0)
+    {
+      asection *section = bfd_get_section_by_name (abfd, "header");
+      if (section
+	  && bfd_section_size (abfd, section) == 36
+	  && i386_dicos_bfd_has_symbol_p (abfd, "Dicos_loadModuleInfo"))
+	return GDB_OSABI_DICOS;
+    }
+
+  return GDB_OSABI_UNKNOWN;
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+void _initialize_i386_dicos_tdep (void);
+
+void
+_initialize_i386_dicos_tdep (void)
+{
+  gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
+                                  i386_dicos_osabi_sniffer);
+
+  gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_DICOS,
+                          i386_dicos_init_abi);
+}

gdb/osabi.c

@@ -72,6 +72,7 @@ static const char * const gdb_osabi_names[] =
 
   "Cygwin",
   "AIX",
+  "DICOS",
 
   "<invalid>"
 };