diff --git gdb/Makefile.in gdb/Makefile.in
index cf59ae7143..0dd72d35d1 100644
--- gdb/Makefile.in
+++ gdb/Makefile.in
@@ -227,7 +227,8 @@ INCGNU = -I$(srcdir)/gnulib/import -I$(GNULIB_BUILDDIR)/import
 
 # Generated headers in the gnulib directory.  These must be listed
 # so that they are generated before other files are compiled.
-GNULIB_H = $(GNULIB_BUILDDIR)/import/string.h @GNULIB_STDINT_H@
+GNULIB_H = $(GNULIB_BUILDDIR)/import/string.h \
+	$(GNULIB_BUILDDIR)/import/alloca.h @GNULIB_STDINT_H@
 
 #
 # CLI sub directory definitons
@@ -745,6 +746,7 @@ TARGET_OBS = @TARGET_OBS@
 # All target-dependent objects files that require 64-bit CORE_ADDR
 # (used with --enable-targets=all --enable-64-bit-bfd).
 ALL_64_TARGET_OBS = \
+	aarch64-fbsd-kern.o \
 	aarch64-fbsd-tdep.o \
 	aarch64-insn.o \
 	aarch64-linux-tdep.o \
@@ -759,6 +761,7 @@ ALL_64_TARGET_OBS = \
 	amd64-darwin-tdep.o \
 	amd64-dicos-tdep.o \
 	amd64-fbsd-tdep.o \
+	amd64fbsd-kern.o \
 	amd64-linux-tdep.o \
 	amd64-nbsd-tdep.o \
 	amd64-obsd-tdep.o \
@@ -770,6 +773,7 @@ ALL_64_TARGET_OBS = \
 	ia64-vms-tdep.o \
 	mips64-obsd-tdep.o \
 	sparc64-fbsd-tdep.o \
+	sparc64fbsd-kern.o \
 	sparc64-linux-tdep.o \
 	sparc64-nbsd-tdep.o \
 	sparc64-obsd-tdep.o \
@@ -797,6 +801,9 @@ ALL_TARGET_OBS = \
 	cris-linux-tdep.o \
 	cris-tdep.o \
 	dicos-tdep.o \
+	fbsd-kld.o \
+	fbsd-kthr.o \
+	fbsd-kvm.o \
 	fbsd-tdep.o \
 	frv-linux-tdep.o \
 	frv-tdep.o \
@@ -813,6 +820,7 @@ ALL_TARGET_OBS = \
 	i386-darwin-tdep.o \
 	i386-dicos-tdep.o \
 	i386-fbsd-tdep.o \
+	i386fbsd-kern.o \
 	i386-gnu-tdep.o \
 	i386-go32-tdep.o \
 	i386-linux-tdep.o \
@@ -837,6 +845,7 @@ ALL_TARGET_OBS = \
 	mep-tdep.o \
 	microblaze-linux-tdep.o \
 	microblaze-tdep.o \
+	mipsfbsd-kern.o \
 	mips-fbsd-tdep.o \
 	mips-linux-tdep.o \
 	mips-nbsd-tdep.o \
@@ -854,6 +863,7 @@ ALL_TARGET_OBS = \
 	nto-tdep.o \
 	obsd-tdep.o \
 	ppc-fbsd-tdep.o \
+	ppcfbsd-kern.o \
 	ppc-linux-tdep.o \
 	ppc-nbsd-tdep.o \
 	ppc-obsd-tdep.o \
@@ -1871,7 +1881,7 @@ generated_files = \
 # Flags needed to compile Python code
 PYTHON_CFLAGS = @PYTHON_CFLAGS@
 
-all: gdb$(EXEEXT) $(CONFIG_ALL)
+all: gdb$(EXEEXT) kgdb$(EXEEXT) $(CONFIG_ALL)
 	@$(MAKE) $(FLAGS_TO_PASS) DO=all "DODIRS=`echo $(SUBDIRS) | sed 's/testsuite//'`" subdir_do
 
 # Rule for compiling .c files in the top-level gdb directory.
@@ -2210,6 +2220,12 @@ gdb$(EXEEXT): gdb.o $(LIBGDB_OBS) $(ADD_DEPS) $(CDEPS) $(TDEPLIBS)
 		-o gdb$(EXEEXT) gdb.o $(LIBGDB_OBS) \
 		$(TDEPLIBS) $(TUI_LIBRARY) $(CLIBS) $(LOADLIBES)
 
+kgdb$(EXEEXT): kgdb-main.o $(LIBGDB_OBS) $(ADD_DEPS) $(CDEPS) $(TDEPLIBS)
+	rm -f kgdb$(EXEEXT)
+	$(CC_LD) $(INTERNAL_LDFLAGS) $(WIN32LDAPP) \
+		-o kgdb$(EXEEXT) kgdb-main.o $(LIBGDB_OBS) \
+		$(TDEPLIBS) $(TUI_LIBRARY) $(CLIBS) $(LOADLIBES)
+
 # Convenience rule to handle recursion.
 $(LIBGNU) $(GNULIB_H): all-lib
 all-lib: $(GNULIB_BUILDDIR)/Makefile
@@ -2254,7 +2270,7 @@ clean mostlyclean: $(CONFIG_CLEAN)
 	@$(MAKE) $(FLAGS_TO_PASS) DO=clean "DODIRS=$(CLEANDIRS)" subdir_do
 	rm -f *.o *.a $(ADD_FILES) *~ init.c-tmp init.l-tmp version.c-tmp
 	rm -f init.c version.c observer.h observer.inc
-	rm -f gdb$(EXEEXT) core make.log
+	rm -f gdb$(EXEEXT) core make.log kgdb$(EXEEXT)
 	rm -f gdb[0-9]$(EXEEXT)
 	rm -f test-cp-name-parser$(EXEEXT)
 	rm -f xml-builtin.c stamp-xml
@@ -2461,6 +2477,7 @@ MAKEOVERRIDES =
 
 ALLDEPFILES = \
 	aarch64-fbsd-nat.c \
+	aarch64-fbsd-kern.c \
 	aarch64-fbsd-tdep.c \
 	aarch64-linux-nat.c \
 	aarch64-linux-tdep.c \
@@ -2478,6 +2495,7 @@ ALLDEPFILES = \
 	amd64-bsd-nat.c \
 	amd64-darwin-tdep.c \
 	amd64-dicos-tdep.c \
+	amd64fbsd-kern.c \
 	amd64-fbsd-nat.c \
 	amd64-fbsd-tdep.c \
 	amd64-linux-nat.c \
@@ -2513,6 +2531,9 @@ ALLDEPFILES = \
 	dcache.c \
 	dicos-tdep.c \
 	exec.c \
+	fbsd-kld.c \
+	fbsd-kthr.c \
+	fbsd-kvm.c \
 	fbsd-nat.c \
 	fbsd-tdep.c \
 	fork-child.c \
@@ -2534,6 +2555,7 @@ ALLDEPFILES = \
 	i386-darwin-nat.c \
 	i386-darwin-tdep.c \
 	i386-dicos-tdep.c \
+	i386fbsd-kern.c \
 	i386-fbsd-nat.c \
 	i386-fbsd-tdep.c \
 	i386-gnu-nat.c \
@@ -2575,6 +2597,7 @@ ALLDEPFILES = \
 	mingw-hdep.c \
 	mips-fbsd-nat.c \
 	mips-fbsd-tdep.c \
+	mipsfbsd-kern.c \
 	mips-linux-nat.c \
 	mips-linux-tdep.c \
 	mips-nbsd-nat.c \
@@ -2592,6 +2615,7 @@ ALLDEPFILES = \
 	obsd-nat.c \
 	obsd-tdep.c \
 	posix-hdep.c \
+	ppcfbsd-kern.c \
 	ppc-fbsd-nat.c \
 	ppc-fbsd-tdep.c \
 	ppc-linux-nat.c \
@@ -2636,6 +2660,7 @@ ALLDEPFILES = \
 	sparc-sol2-nat.c \
 	sparc-sol2-tdep.c \
 	sparc-tdep.c \
+	sparc64fbsd-kern.c \
 	sparc64-fbsd-nat.c \
 	sparc64-fbsd-tdep.c \
 	sparc64-linux-nat.c \
@@ -2667,6 +2692,12 @@ ALLDEPFILES = \
 	xtensa-linux-tdep.c \
 	xtensa-tdep.c \
 	xtensa-xtregs.c \
+	kgdb/kld.c \
+	kgdb/kthr.c \
+	kgdb/trgt.c \
+	kgdb/trgt_amd64.c \
+	kgdb/trgt_i386.c \
+	kgdb/trgt_sparc64.c \
 	common/mingw-strerror.c \
 	common/posix-strerror.c
 
@@ -2928,7 +2959,7 @@ endif
 
 # A list of all the objects we might care about in this build, for
 # dependency tracking.
-all_object_files = gdb.o $(LIBGDB_OBS) gdbtk-main.o \
+all_object_files = kgdb-main.o gdb.o $(LIBGDB_OBS) gdbtk-main.o \
 	test-cp-name-parser.o
 
 # Ensure that generated files are created early.  Use order-only
diff --git gdb/config.in gdb/config.in
index 3f8a72326b..bb1e8c23bf 100644
--- gdb/config.in
+++ gdb/config.in
@@ -222,6 +222,9 @@
 /* Define to 1 if your system has the kinfo_getvmmap function. */
 #undef HAVE_KINFO_GETVMMAP
 
+/* Define to 1 if your system has the kvm_open2 function. */
+#undef HAVE_KVM_OPEN2
+
 /* Define if you have <langinfo.h> and nl_langinfo(CODESET). */
 #undef HAVE_LANGINFO_CODESET
 
diff --git gdb/config/mips/fbsd.mh gdb/config/mips/fbsd.mh
index f433347a20..5470795612 100644
--- gdb/config/mips/fbsd.mh
+++ gdb/config/mips/fbsd.mh
@@ -1,3 +1,5 @@
 # Host: FreeBSD/mips
 NATDEPFILES= fork-child.o inf-ptrace.o fbsd-nat.o mips-fbsd-nat.o
 HAVE_NATIVE_GCORE_HOST = 1
+
+LOADLIBES= -lkvm
diff --git gdb/configure gdb/configure
index e14886b67d..5682ce42d6 100755
--- gdb/configure
+++ gdb/configure
@@ -7968,6 +7968,66 @@ $as_echo "#define HAVE_KINFO_GETVMMAP 1" >>confdefs.h
 fi
 
 
+# kgdb needs kvm_open2 for cross-debugging
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing kvm_open2" >&5
+$as_echo_n "checking for library containing kvm_open2... " >&6; }
+if test "${ac_cv_search_kvm_open2+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_func_search_save_LIBS=$LIBS
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char kvm_open2 ();
+int
+main ()
+{
+return kvm_open2 ();
+  ;
+  return 0;
+}
+_ACEOF
+for ac_lib in '' kvm; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_search_kvm_open2=$ac_res
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext
+  if test "${ac_cv_search_kvm_open2+set}" = set; then :
+  break
+fi
+done
+if test "${ac_cv_search_kvm_open2+set}" = set; then :
+
+else
+  ac_cv_search_kvm_open2=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_kvm_open2" >&5
+$as_echo "$ac_cv_search_kvm_open2" >&6; }
+ac_res=$ac_cv_search_kvm_open2
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
+
+$as_echo "#define HAVE_KVM_OPEN2 1" >>confdefs.h
+
+fi
+
+
 
       if test "X$prefix" = "XNONE"; then
     acl_final_prefix="$ac_default_prefix"
diff --git gdb/configure.ac gdb/configure.ac
index 50f6f592ba..89cdc9cc8e 100644
--- gdb/configure.ac
+++ gdb/configure.ac
@@ -530,6 +530,11 @@ AC_SEARCH_LIBS(kinfo_getvmmap, util util-freebsd,
   [AC_DEFINE(HAVE_KINFO_GETVMMAP, 1,
             [Define to 1 if your system has the kinfo_getvmmap function. ])])
 
+# kgdb needs kvm_open2 for cross-debugging
+AC_SEARCH_LIBS(kvm_open2, kvm,
+  [AC_DEFINE(HAVE_KVM_OPEN2, 1,
+            [Define to 1 if your system has the kvm_open2 function. ])])
+
 AM_ICONV
 
 # GDB may fork/exec the iconv program to get the list of supported character
diff --git gdb/configure.tgt gdb/configure.tgt
index f72a0dbbc1..2d73300961 100644
--- gdb/configure.tgt
+++ gdb/configure.tgt
@@ -203,7 +203,13 @@ i[34567]86-*-dicos*)
 i[34567]86-*-freebsd* | i[34567]86-*-kfreebsd*-gnu)
 	# Target: FreeBSD/i386
 	gdb_target_obs="i386-tdep.o i387-tdep.o i386-bsd-tdep.o i386-fbsd-tdep.o \
-			fbsd-tdep.o solib-svr4.o"
+			fbsd-tdep.o solib-svr4.o \
+			fbsd-kld.o fbsd-kthr.o fbsd-kvm.o i386fbsd-kern.o"
+	if test "x$enable_64_bit_bfd" = "xyes"; then
+	    # Target: FreeBSD amd64
+	    gdb_target_obs="amd64-tdep.o amd64fbsd-tdep.o amd64fbsd-kern.o \
+			    ${gdb_target_obs}"
+	fi
 	;;
 i[34567]86-*-netbsd* | i[34567]86-*-knetbsd*-gnu)
 	# Target: NetBSD/i386
@@ -377,7 +383,8 @@ mips*-*-netbsd* | mips*-*-knetbsd*-gnu)
 	;;
 mips*-*-freebsd*)
 	# Target: MIPS running FreeBSD
-	gdb_target_obs="mips-tdep.o mips-fbsd-tdep.o solib-svr4.o fbsd-tdep.o"
+	gdb_target_obs="mips-tdep.o mips-fbsd-tdep.o solib-svr4.o fbsd-tdep.o \
+			fbsd-kld.o fbsd-kthr.o fbsd-kvm.o mipsfbsd-kern.o"
 	gdb_sim=../sim/mips/libsim.a
 	;;
 mips64*-*-openbsd*)
@@ -436,7 +443,8 @@ powerpc*-*-freebsd*)
 	# Target: FreeBSD/powerpc
 	gdb_target_obs="rs6000-tdep.o ppc-sysv-tdep.o ppc64-tdep.o \
 		        ppc-fbsd-tdep.o fbsd-tdep.o solib-svr4.o \
-			ravenscar-thread.o ppc-ravenscar-thread.o"
+			ravenscar-thread.o ppc-ravenscar-thread.o \
+			fbsd-kld.o fbsd-kthr.o fbsd-kvm.o ppcfbsd-kern.o"
 	;;
 
 powerpc-*-netbsd* | powerpc-*-knetbsd*-gnu)
@@ -560,7 +568,8 @@ sparc*-*-freebsd* | sparc*-*-kfreebsd*-gnu)
 	# Target: FreeBSD/sparc64
 	gdb_target_obs="sparc-tdep.o sparc64-tdep.o sparc64-fbsd-tdep.o \
 			fbsd-tdep.o solib-svr4.o \
-			ravenscar-thread.o sparc-ravenscar-thread.o"
+			ravenscar-thread.o sparc-ravenscar-thread.o \
+			fbsd-kld.o fbsd-kthr.o fbsd-kvm.o sparc64fbsd-kern.o"
 	;;
 sparc-*-netbsd* | sparc-*-knetbsd*-gnu)
 	# Target: NetBSD/sparc
@@ -691,7 +700,9 @@ x86_64-*-freebsd* | x86_64-*-kfreebsd*-gnu)
 	# Target: FreeBSD/amd64
 	gdb_target_obs="amd64-tdep.o amd64-fbsd-tdep.o i386-tdep.o \
 			i387-tdep.o i386-bsd-tdep.o i386-fbsd-tdep.o \
-			fbsd-tdep.o solib-svr4.o"
+			fbsd-tdep.o solib-svr4.o \
+			fbsd-kld.o fbsd-kthr.o fbsd-kvm.o amd64fbsd-kern.o \
+			i386fbsd-kern.o"
 	;;
 x86_64-*-mingw* | x86_64-*-cygwin*)
         # Target: MingW/amd64
diff --git gdb/defs.h gdb/defs.h
index a0b586f401..44d3d112ed 100644
--- gdb/defs.h
+++ gdb/defs.h
@@ -590,6 +590,7 @@ enum gdb_osabi
   GDB_OSABI_SOLARIS,
   GDB_OSABI_LINUX,
   GDB_OSABI_FREEBSD,
+  GDB_OSABI_FREEBSD_KERNEL,
   GDB_OSABI_NETBSD,
   GDB_OSABI_OPENBSD,
   GDB_OSABI_WINCE,
diff --git gdb/osabi.c gdb/osabi.c
index 84fa9c0273..5c49e22657 100644
--- gdb/osabi.c
+++ gdb/osabi.c
@@ -65,6 +65,7 @@ static const struct osabi_names gdb_osabi_names[] =
   { "Solaris", NULL },
   { "GNU/Linux", "linux(-gnu)?" },
   { "FreeBSD", NULL },
+  { "FreeBSD/kernel", NULL },
   { "NetBSD", NULL },
   { "OpenBSD", NULL },
   { "WindowsCE", NULL },
diff --git gdb/regcache.c gdb/regcache.c
index 37bc2f0046..9da3aaa514 100644
--- gdb/regcache.c
+++ gdb/regcache.c
@@ -1105,6 +1105,20 @@ regcache_raw_supply (struct regcache *regcache, int regnum, const void *buf)
     }
 }
 
+void
+regcache_raw_supply_unsigned (struct regcache *regcache, int regnum,
+			      ULONGEST val)
+{
+  gdb_byte *buf;
+
+  gdb_assert (regcache != NULL);
+  gdb_assert (regnum >=0 && regnum < regcache->descr->nr_raw_registers);
+  buf = (gdb_byte *)alloca (regcache->descr->sizeof_register[regnum]);
+  store_unsigned_integer (buf, regcache->descr->sizeof_register[regnum],
+			  gdbarch_byte_order (regcache->descr->gdbarch), val);
+  regcache_raw_supply (regcache, regnum, buf);
+}
+
 /* Collect register REGNUM from REGCACHE and store its contents in BUF.  */
 
 void
diff --git gdb/regcache.h gdb/regcache.h
index 1d60fa7616..9b8a4723a3 100644
--- gdb/regcache.h
+++ gdb/regcache.h
@@ -149,6 +149,8 @@ extern void regcache_write_pc (struct regcache *regcache, CORE_ADDR pc);
 
 extern void regcache_raw_supply (struct regcache *regcache,
 				 int regnum, const void *buf);
+extern void regcache_raw_supply_unsigned (struct regcache *regcache,
+					  int regnum, ULONGEST val);
 extern void regcache_raw_collect (const struct regcache *regcache,
 				  int regnum, void *buf);