22 files changed, 505 insertions, 303 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 63ccd27..944a4ca 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,98 @@
+2010-03-01  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* amd64-linux-nat.c (AMD64_LINUX_USER64_CS): New.
+	(amd64_linux_read_description): Likewise.
+	(_initialize_amd64_linux_nat): Set to_read_description to
+	amd64_linux_read_description.
+
+	* amd64-linux-tdep.c: Include "features/i386/amd64-linux.c".
+	(amd64_linux_register_name): Removed.
+	(amd64_linux_register_type): Likewise.
+	(amd64_linux_core_read_description): New.
+	(amd64_linux_init_abi): Set target description to
+	tdesc_amd64_linux if needed.  Support orig_rax in target
+	description.  Don't call set_gdbarch_register_name nor
+	set_gdbarch_register_type.  Call
+	set_gdbarch_core_read_description.
+	(_initialize_amd64_linux_tdep): Call
+	initialize_tdesc_amd64_linux.
+
+	* amd64-linux-tdep.h (tdesc_amd64_linux): New.
+
+	* amd64-tdep.c:  Include "features/i386/amd64.c".
+	(amd64_register_names): Removed.
+	(amd64_register_name): Likewise.
+	(amd64_register_type): Likewise.
+	(amd64_init_abi):  Set num_core_regs and register_names.  Set
+	target description to tdesc_amd64 if needed.  Don't call 
+	set_gdbarch_register_name nor set_gdbarch_register_type.
+	(_initialize_amd64_tdep): New.
+
+	* i386-linux-nat.c (i386_linux_read_description): New.
+	(_initialize_i386_linux_nat): Set to_read_description to
+	i386_linux_read_description.
+
+	* i386-linux-tdep.c: Include "features/i386/i386-linux.c".
+	(i386_linux_register_name): Removed.
+	(i386_linux_core_read_description): New.
+	(i386_linux_read_description): Likewise.
+	(i386_linux_init_abi): Don't call set_gdbarch_register_name.
+	Set target description to tdesc_i386_linux if needed.  Support
+	orig_eax.  Set register_reggroup_p.  Call
+	set_gdbarch_core_read_description.
+	(_initialize_i386_linux_tdep): Call initialize_tdesc_i386_linux.
+
+	* i386-linux-tdep.h (tdesc_i386_linux): New.
+
+	* i386-nto-tdep.c (i386nto_regset_id): Replace I386_NUM_FREGS
+	with I387_NUM_REGS.
+
+	* i386-tdep.c: Include "features/i386/i386.c".
+	(i386_register_names): Make it const.
+	(i386_mmx_names): Likewise.
+	(i386_num_register_names): Removed.
+	(i386_register_name): Likewise.
+	(i386_eflags_type): Likewise.
+	(i386_mxcsr_type): Likewise.
+	(i386_sse_type): Likewise.
+	(i386_register_type): Likewise.
+	(i387_ext_type): Call tdesc_find_type instead of arch_float_type.
+	(i386_pseudo_register_name): New.
+	(i386_pseudo_register_type): Likewise.
+	(i386_mmx_type): Make it static.
+	(i386_gdbarch_init): Check arch.  Replace I386_NUM_FREGS with
+	I387_NUM_REGS.  Set num_core_regs and register_names.  Don't
+	call set_gdbarch_register_name nor set_gdbarch_register_type.
+	Set register_reggroup_p.  Set target description to tdesc_i386
+	if needed.  Call set_tdesc_pseudo_register_type,
+	set_tdesc_pseudo_register_name and tdesc_use_registers.
+	(_initialize_i386_tdep): Call initialize_tdesc_i386.
+	initialize_tdesc_x86_64.
+
+	* i386-tdep.h (gdbarch_tdep): Remove i386_eflags_type,
+	i386_mxcsr_type and i386_sse_type.  Add num_core_regs,
+	register_names, tdesc and register_reggroup_p.
+	(I386_NUM_FREGS): Removed.
+	(i386_eflags_type): Likewise.
+	(i386_mxcsr_type): Likewise.
+	(i386_mmx_type): Likewise.
+	(i386_sse_type): Likewise.
+	(i386_register_name): Likewise.
+	(i386_regnum): Add I386_MXCSR_REGNUM.
+	(I386_SSE_NUM_REGS): Defined with I386_MXCSR_REGNUM.
+
+	* i387-tdep.h (I387_NUM_REGS): New.
+
+	* regformats/i386/i386-linux.dat: Generated.
+	* regformats/i386/i386.dat: Likewise.
+	* regformats/i386/amd64-linux.dat: Likewise.
+	* regformats/i386/amd64.dat: Likewise.
+
+	* regformats/reg-i386-linux.dat: Removed.
+	* regformats/reg-i386.dat: Likewise.
+	* regformats/reg-x86-64-linux.dat: Likewise.
+	* regformats/reg-x86-64.dat: Likewise.
+
 2010-03-01  Corinna Vinschen  <vinschen@redhat.com>
 
 	* remote-fileio.c (remote_fileio_func_rename): Use Cygwin 1.7
diff --git a/gdb/amd64-linux-nat.c b/gdb/amd64-linux-nat.c
index 5c9e558..b9d5833 100644
--- a/gdb/amd64-linux-nat.c
+++ b/gdb/amd64-linux-nat.c
@@ -674,6 +674,39 @@ amd64_linux_siginfo_fixup (struct siginfo *native, gdb_byte *inf, int direction)
     return 0;
 }
 
+/* Get Linux/x86 target description from running target.
+
+   Value of CS segment register:
+     1. 64bit process: 0x33.
+     2. 32bit process: 0x23.
+ */
+
+#define AMD64_LINUX_USER64_CS	0x33
+
+static const struct target_desc *
+amd64_linux_read_description (struct target_ops *ops)
+{
+  unsigned long cs;
+  int tid;
+
+  /* GNU/Linux LWP ID's are process ID's.  */
+  tid = TIDGET (inferior_ptid);
+  if (tid == 0)
+    tid = PIDGET (inferior_ptid); /* Not a threaded program.  */
+
+  /* Get CS register.  */
+  errno = 0;
+  cs = ptrace (PTRACE_PEEKUSER, tid,
+	       offsetof (struct user_regs_struct, cs), 0);
+  if (errno != 0)
+    perror_with_name (_("Couldn't get CS register"));
+
+  if (cs == AMD64_LINUX_USER64_CS)
+    return tdesc_amd64_linux;
+  else
+    return tdesc_i386_linux;
+}
+
 /* Provide a prototype to silence -Wmissing-prototypes.  */
 void _initialize_amd64_linux_nat (void);
 
@@ -712,6 +745,8 @@ _initialize_amd64_linux_nat (void)
   t->to_fetch_registers = amd64_linux_fetch_inferior_registers;
   t->to_store_registers = amd64_linux_store_inferior_registers;
 
+  t->to_read_description = amd64_linux_read_description;
+
   /* Register the target.  */
   linux_nat_add_target (t);
   linux_nat_set_new_thread (t, amd64_linux_new_thread);
diff --git a/gdb/amd64-linux-tdep.c b/gdb/amd64-linux-tdep.c
index c28eef7..4ad6dc9 100644
--- a/gdb/amd64-linux-tdep.c
+++ b/gdb/amd64-linux-tdep.c
@@ -37,6 +37,8 @@
 #include "solib-svr4.h"
 #include "xml-syscall.h"
 
+#include "features/i386/amd64-linux.c"
+
 /* The syscall's XML filename for i386.  */
 #define XML_SYSCALL_FILENAME_AMD64 "syscalls/amd64-linux.xml"
 
@@ -234,26 +236,6 @@ static int amd64_linux_sc_reg_offset[] =
   -1				/* %gs */
 };
 
-/* Replacement register functions which know about %orig_rax.  */
-
-static const char *
-amd64_linux_register_name (struct gdbarch *gdbarch, int reg)
-{
-  if (reg == AMD64_LINUX_ORIG_RAX_REGNUM)
-    return "orig_rax";
-
-  return amd64_register_name (gdbarch, reg);
-}
-
-static struct type *
-amd64_linux_register_type (struct gdbarch *gdbarch, int reg)
-{
-  if (reg == AMD64_LINUX_ORIG_RAX_REGNUM)
-    return builtin_type (gdbarch)->builtin_int64;
-
-  return amd64_register_type (gdbarch, reg);
-}
-
 static int
 amd64_linux_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 				 struct reggroup *group)
@@ -1260,10 +1242,32 @@ amd64_linux_record_signal (struct gdbarch *gdbarch,
   return 0;
 }
 
+/* Get Linux/x86 target description from core dump.  */
+
+static const struct target_desc *
+amd64_linux_core_read_description (struct gdbarch *gdbarch,
+				  struct target_ops *target,
+				  bfd *abfd)
+{
+  asection *section = bfd_get_section_by_name (abfd, ".reg2");
+
+  if (section == NULL)
+    return NULL;
+
+  /* Linux/x86-64.  */
+  return tdesc_amd64_linux;
+}
+
 static void
 amd64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  const struct target_desc *tdesc = info.target_desc;
+  struct tdesc_arch_data *tdesc_data = (void *) info.tdep_info;
+  const struct tdesc_feature *feature;
+  int valid_p;
+
+  gdb_assert (tdesc_data);
 
   tdep->gregset_reg_offset = amd64_linux_gregset_reg_offset;
   tdep->gregset_num_regs = ARRAY_SIZE (amd64_linux_gregset_reg_offset);
@@ -1271,6 +1275,23 @@ amd64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   amd64_init_abi (info, gdbarch);
 
+  /* Reserve a number for orig_rax.  */
+  set_gdbarch_num_regs (gdbarch, AMD64_LINUX_NUM_REGS);
+
+  if (! tdesc_has_registers (tdesc))
+    tdesc = tdesc_amd64_linux;
+  tdep->tdesc = tdesc;
+
+  feature = tdesc_find_feature (tdesc, "org.gnu.gdb.i386.linux");
+  if (feature == NULL)
+    return;
+
+  valid_p = tdesc_numbered_register (feature, tdesc_data,
+				     AMD64_LINUX_ORIG_RAX_REGNUM,
+				     "orig_rax");
+  if (!valid_p)
+    return;
+
   tdep->sigtramp_p = amd64_linux_sigtramp_p;
   tdep->sigcontext_addr = amd64_linux_sigcontext_addr;
   tdep->sc_reg_offset = amd64_linux_sc_reg_offset;
@@ -1282,10 +1303,8 @@ amd64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   /* Add the %orig_rax register used for syscall restarting.  */
   set_gdbarch_write_pc (gdbarch, amd64_linux_write_pc);
-  set_gdbarch_num_regs (gdbarch, AMD64_LINUX_NUM_REGS);
-  set_gdbarch_register_name (gdbarch, amd64_linux_register_name);
-  set_gdbarch_register_type (gdbarch, amd64_linux_register_type);
-  set_gdbarch_register_reggroup_p (gdbarch, amd64_linux_register_reggroup_p);
+
+  tdep->register_reggroup_p = amd64_linux_register_reggroup_p;
 
   /* Functions for 'catch syscall'.  */
   set_xml_syscall_file_name (XML_SYSCALL_FILENAME_AMD64);
@@ -1299,6 +1318,9 @@ amd64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   /* GNU/Linux uses SVR4-style shared libraries.  */
   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 
+  set_gdbarch_core_read_description (gdbarch,
+				     amd64_linux_core_read_description);
+
   /* Displaced stepping.  */
   set_gdbarch_displaced_step_copy_insn (gdbarch,
                                         amd64_displaced_step_copy_insn);
@@ -1492,4 +1514,7 @@ _initialize_amd64_linux_tdep (void)
 {
   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 			  GDB_OSABI_LINUX, amd64_linux_init_abi);
+
+  /* Initialize the Linux target description  */
+  initialize_tdesc_amd64_linux ();
 }
diff --git a/gdb/amd64-linux-tdep.h b/gdb/amd64-linux-tdep.h
index 20a15ca..33316fb 100644
--- a/gdb/amd64-linux-tdep.h
+++ b/gdb/amd64-linux-tdep.h
@@ -31,6 +31,9 @@
 /* Total number of registers for GNU/Linux.  */
 #define AMD64_LINUX_NUM_REGS (AMD64_LINUX_ORIG_RAX_REGNUM + 1)
 
+/* Linux target description.  */
+extern struct target_desc *tdesc_amd64_linux;
+
 /* Enum that defines the syscall identifiers for amd64 linux.
    Used for process record/replay, these will be translated into
    a gdb-canonical set of syscall ids in linux-record.c.  */
diff --git a/gdb/amd64-tdep.c b/gdb/amd64-tdep.c
index 2b15141..0ec60c1 100644
--- a/gdb/amd64-tdep.c
+++ b/gdb/amd64-tdep.c
@@ -42,6 +42,8 @@
 #include "amd64-tdep.h"
 #include "i387-tdep.h"
 
+#include "features/i386/amd64.c"
+
 /* Note that the AMD64 architecture was previously known as x86-64.
    The latter is (forever) engraved into the canonical system name as
    returned by config.guess, and used as the name for the AMD64 port
@@ -83,47 +85,6 @@ static int amd64_dummy_call_integer_regs[] =
   9				/* %r9 */
 };
 
-/* Return the name of register REGNUM.  */
-
-const char *
-amd64_register_name (struct gdbarch *gdbarch, int regnum)
-{
-  if (regnum >= 0 && regnum < AMD64_NUM_REGS)
-    return amd64_register_names[regnum];
-
-  return NULL;
-}
-
-/* Return the GDB type object for the "standard" data type of data in
-   register REGNUM. */
-
-struct type *
-amd64_register_type (struct gdbarch *gdbarch, int regnum)
-{
-  if (regnum >= AMD64_RAX_REGNUM && regnum <= AMD64_RDI_REGNUM)
-    return builtin_type (gdbarch)->builtin_int64;
-  if (regnum == AMD64_RBP_REGNUM || regnum == AMD64_RSP_REGNUM)
-    return builtin_type (gdbarch)->builtin_data_ptr;
-  if (regnum >= AMD64_R8_REGNUM && regnum <= AMD64_R15_REGNUM)
-    return builtin_type (gdbarch)->builtin_int64;
-  if (regnum == AMD64_RIP_REGNUM)
-    return builtin_type (gdbarch)->builtin_func_ptr;
-  if (regnum == AMD64_EFLAGS_REGNUM)
-    return i386_eflags_type (gdbarch);
-  if (regnum >= AMD64_CS_REGNUM && regnum <= AMD64_GS_REGNUM)
-    return builtin_type (gdbarch)->builtin_int32;
-  if (regnum >= AMD64_ST0_REGNUM && regnum <= AMD64_ST0_REGNUM + 7)
-    return i387_ext_type (gdbarch);
-  if (regnum >= AMD64_FCTRL_REGNUM && regnum <= AMD64_FCTRL_REGNUM + 7)
-    return builtin_type (gdbarch)->builtin_int32;
-  if (regnum >= AMD64_XMM0_REGNUM && regnum <= AMD64_XMM0_REGNUM + 15)
-    return i386_sse_type (gdbarch);
-  if (regnum == AMD64_MXCSR_REGNUM)
-    return i386_mxcsr_type (gdbarch);
-
-  internal_error (__FILE__, __LINE__, _("invalid regnum"));
-}
-
 /* DWARF Register Number Mapping as defined in the System V psABI,
    section 3.6.  */
 
@@ -2153,11 +2114,19 @@ void
 amd64_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  const struct target_desc *tdesc = info.target_desc;
 
   /* AMD64 generally uses `fxsave' instead of `fsave' for saving its
      floating-point registers.  */
   tdep->sizeof_fpregset = I387_SIZEOF_FXSAVE;
 
+  if (! tdesc_has_registers (tdesc))
+    tdesc = tdesc_amd64;
+  tdep->tdesc = tdesc;
+
+  tdep->num_core_regs = AMD64_NUM_GREGS + I387_NUM_REGS;
+  tdep->register_names = amd64_register_names;
+
   /* AMD64 has an FPU and 16 SSE registers.  */
   tdep->st0_regnum = AMD64_ST0_REGNUM;
   tdep->num_xmm_regs = 16;
@@ -2173,8 +2142,6 @@ amd64_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_gdbarch_long_double_bit (gdbarch, 128);
 
   set_gdbarch_num_regs (gdbarch, AMD64_NUM_REGS);
-  set_gdbarch_register_name (gdbarch, amd64_register_name);
-  set_gdbarch_register_type (gdbarch, amd64_register_type);
 
   /* Register numbers of various important registers.  */
   set_gdbarch_sp_regnum (gdbarch, AMD64_RSP_REGNUM); /* %rsp */
@@ -2236,6 +2203,15 @@ amd64_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   set_gdbarch_get_longjmp_target (gdbarch, amd64_get_longjmp_target);
 }
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+void _initialize_amd64_tdep (void);
+
+void
+_initialize_amd64_tdep (void)
+{
+  initialize_tdesc_amd64 ();
+}
 
 
 /* The 64-bit FXSAVE format differs from the 32-bit format in the
diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index b16c95c..4fae9cc 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,50 @@
+2010-03-01  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* Makefile.in (clean): Replace reg-i386.c, reg-x86-64.c,
+	reg-i386-linux.c and reg-x86-64-linux.c with i386.c, amd64.c,
+	i386-linux.c and amd64-linux.c.
+	(reg-i386.o): Removed.
+	(reg-i386.c): Likewise.
+	(reg-i386-linux.o): Likewise.
+	(reg-i386-linux.c): Likewise.
+	(reg-x86-64.o): Likewise.
+	(reg-x86-64.c): Likewise.
+	(reg-x86-64-linux.o): Likewise.
+	(reg-x86-64-linux.c): Likewise.
+	(i386.o): New.
+	(i386.c): Likewise.
+	(i386-linux.o): Likewise.
+	(i386-linux.c): Likewise.
+	(amd64.o): Likewise.
+	(amd64.c): Likewise.
+	(amd64-linux.o): Likewise.
+	(amd64-linux.c): Likewise.
+
+	* configure.srv (srv_i386_regobj): New.
+	(srv_i386_linux_regobj): Likewise.
+	(srv_amd64_regobj): Likewise.
+	(srv_amd64_linux_regobj): Likewise.
+	(srv_i386_32bit_xmlfiles): Likewise.
+	(srv_i386_64bit_xmlfiles): Likewise.
+	(srv_i386_xmlfiles): Likewise.
+	(srv_amd64_xmlfiles): Likewise.
+	(srv_i386_linux_xmlfiles): Likewise.
+	(srv_amd64_linux_xmlfiles): Likewise.
+	(i[34567]86-*-cygwin*): Set srv_regobj to $srv_i386_regobj.  Set
+	srv_xmlfiles to $srv_i386_xmlfiles.
+	(i[34567]86-*-mingw32ce*): Likewise.
+	(i[34567]86-*-mingw*): Likewise.
+	(i[34567]86-*-nto*): Likewise.
+	(i[34567]86-*-linux*): Set srv_regobj to $srv_i386_linux_regobj
+	and $srv_amd64_linux_regobj.  Set srv_xmlfiles to
+	$srv_i386_linux_xmlfiles and $srv_amd64_linux_xmlfiles.
+	(x86_64-*-linux*): Likewise.
+
+	* linux-x86-low.c (init_registers_x86_64_linux): Removed.
+	(init_registers_amd64_linux): New.
+	(x86_arch_setup): Replace init_registers_x86_64_linux with
+	init_registers_amd64_linux.
+
 2010-02-23  Maxim Kuvyrkov  <maxim@codesourcery.com>
 
 	* configure.ac: Check for libdl.  If it is not available link against
diff --git a/gdb/gdbserver/Makefile.in b/gdb/gdbserver/Makefile.in
index 5bf82e2..7fecced 100644
--- a/gdb/gdbserver/Makefile.in
+++ b/gdb/gdbserver/Makefile.in
@@ -203,9 +203,9 @@ clean:
 	rm -f *.o ${ADD_FILES} *~
 	rm -f version.c
 	rm -f gdbserver$(EXEEXT) gdbreplay$(EXEEXT) core make.log
-	rm -f reg-arm.c reg-i386.c reg-ia64.c reg-m32r.c reg-m68k.c
-	rm -f reg-sh.c reg-sparc.c reg-spu.c reg-x86-64.c reg-i386-linux.c
-	rm -f reg-cris.c reg-crisv32.c reg-x86-64-linux.c reg-xtensa.c
+	rm -f reg-arm.c i386.c reg-ia64.c reg-m32r.c reg-m68k.c
+	rm -f reg-sh.c reg-sparc.c reg-spu.c amd64.c i386-linux.c
+	rm -f reg-cris.c reg-crisv32.c amd64-linux.c reg-xtensa.c
 	rm -f arm-with-iwmmxt.c
 	rm -f arm-with-vfpv2.c arm-with-vfpv3.c arm-with-neon.c
 	rm -f mips-linux.c mips64-linux.c
@@ -345,12 +345,12 @@ reg-cris.c : $(srcdir)/../regformats/reg-cris.dat $(regdat_sh)
 reg-crisv32.o : reg-crisv32.c $(regdef_h)
 reg-crisv32.c : $(srcdir)/../regformats/reg-crisv32.dat $(regdat_sh)
 	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/reg-crisv32.dat reg-crisv32.c
-reg-i386.o : reg-i386.c $(regdef_h)
-reg-i386.c : $(srcdir)/../regformats/reg-i386.dat $(regdat_sh)
-	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/reg-i386.dat reg-i386.c
-reg-i386-linux.o : reg-i386-linux.c $(regdef_h)
-reg-i386-linux.c : $(srcdir)/../regformats/reg-i386-linux.dat $(regdat_sh)
-	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/reg-i386-linux.dat reg-i386-linux.c
+i386.o : i386.c $(regdef_h)
+i386.c : $(srcdir)/../regformats/i386/i386.dat $(regdat_sh)
+	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/i386/i386.dat i386.c
+i386-linux.o : i386-linux.c $(regdef_h)
+i386-linux.c : $(srcdir)/../regformats/i386/i386-linux.dat $(regdat_sh)
+	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/i386/i386-linux.dat i386-linux.c
 reg-ia64.o : reg-ia64.c $(regdef_h)
 reg-ia64.c : $(srcdir)/../regformats/reg-ia64.dat $(regdat_sh)
 	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/reg-ia64.dat reg-ia64.c
@@ -432,12 +432,12 @@ reg-sparc64.c : $(srcdir)/../regformats/reg-sparc64.dat $(regdat_sh)
 reg-spu.o : reg-spu.c $(regdef_h)
 reg-spu.c : $(srcdir)/../regformats/reg-spu.dat $(regdat_sh)
 	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/reg-spu.dat reg-spu.c
-reg-x86-64.o : reg-x86-64.c $(regdef_h)
-reg-x86-64.c : $(srcdir)/../regformats/reg-x86-64.dat $(regdat_sh)
-	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/reg-x86-64.dat reg-x86-64.c
-reg-x86-64-linux.o : reg-x86-64-linux.c $(regdef_h)
-reg-x86-64-linux.c : $(srcdir)/../regformats/reg-x86-64-linux.dat $(regdat_sh)
-	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/reg-x86-64-linux.dat reg-x86-64-linux.c
+amd64.o : amd64.c $(regdef_h)
+amd64.c : $(srcdir)/../regformats/i386/amd64.dat $(regdat_sh)
+	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/i386/amd64.dat amd64.c
+amd64-linux.o : amd64-linux.c $(regdef_h)
+amd64-linux.c : $(srcdir)/../regformats/i386/amd64-linux.dat $(regdat_sh)
+	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/i386/amd64-linux.dat amd64-linux.c
 reg-xtensa.o : reg-xtensa.c $(regdef_h)
 reg-xtensa.c : $(srcdir)/../regformats/reg-xtensa.dat $(regdat_sh)
 	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/reg-xtensa.dat reg-xtensa.c
diff --git a/gdb/gdbserver/configure.srv b/gdb/gdbserver/configure.srv
index f6d92b3..e5818cd 100644
--- a/gdb/gdbserver/configure.srv
+++ b/gdb/gdbserver/configure.srv
@@ -22,6 +22,18 @@
 # Default hostio_last_error implementation
 srv_hostio_err_objs="hostio-errno.o"
 
+srv_i386_regobj=i386.o
+srv_i386_linux_regobj=i386-linux.o
+srv_amd64_regobj=amd64.o
+srv_amd64_linux_regobj=amd64-linux.o
+
+srv_i386_32bit_xmlfiles="i386/32bit-core.xml i386/32bit-sse.xml"
+srv_i386_64bit_xmlfiles="i386/64bit-core.xml i386/64bit-sse.xml"
+srv_i386_xmlfiles="i386/i386.xml $srv_i386_32bit_xmlfiles"
+srv_amd64_xmlfiles="i386/amd64.xml $srv_i386_64bit_xmlfiles"
+srv_i386_linux_xmlfiles="i386/i386-linux.xml i386/32bit-linux.xml $srv_i386_32bit_xmlfiles"
+srv_amd64_linux_xmlfiles="i386/amd64-linux.xml i386/64bit-linux.xml $srv_i386_64bit_xmlfiles"
+
 # Input is taken from the "${target}" variable.
 
 case "${target}" in
@@ -60,12 +72,15 @@ case "${target}" in
 			srv_linux_usrregs=yes
 			srv_linux_thread_db=yes
 			;;
-  i[34567]86-*-cygwin*)	srv_regobj=reg-i386.o
+  i[34567]86-*-cygwin*)	srv_regobj="$srv_i386_regobj"
 			srv_tgtobj="i386-low.o win32-low.o win32-i386-low.o"
+			srv_xmlfiles="$srv_i386_xmlfiles"
 			;;
-  i[34567]86-*-linux*)	srv_regobj=reg-i386-linux.o
+  i[34567]86-*-linux*)	srv_regobj="$srv_i386_linux_regobj"
+			srv_xmlfiles="$srv_i386_linux_xmlfiles"
 			if test "$gdb_cv_i386_is_x86_64" = yes ; then
-			    srv_regobj="reg-x86-64-linux.o $srv_regobj"
+			    srv_regobj="$srv_regobj $srv_amd64_linux_regobj"
+			    srv_xmlfiles="${srv_xmlfiles} $srv_amd64_linux_xmlfiles"
 			fi
 			srv_tgtobj="linux-low.o linux-x86-low.o i386-low.o i387-fp.o"
 			srv_linux_usrregs=yes
@@ -73,20 +88,23 @@ case "${target}" in
 			srv_linux_thread_db=yes
 			;;
   i[34567]86-*-mingw32ce*)
-			srv_regobj=reg-i386.o
+			srv_regobj="$srv_i386_regobj"
 			srv_tgtobj="i386-low.o win32-low.o win32-i386-low.o"
 			srv_tgtobj="${srv_tgtobj} wincecompat.o"
+			srv_xmlfiles="$srv_i386_xmlfiles"
 			# hostio_last_error implementation is in win32-low.c
 			srv_hostio_err_objs=""
 			srv_mingw=yes
 			srv_mingwce=yes
 			;;
-  i[34567]86-*-mingw*)	srv_regobj=reg-i386.o
+  i[34567]86-*-mingw*)	srv_regobj="$srv_i386_regobj"
 			srv_tgtobj="i386-low.o win32-low.o win32-i386-low.o"
+			srv_xmlfiles="$srv_i386_xmlfiles"
 			srv_mingw=yes
 			;;
-  i[34567]86-*-nto*)	srv_regobj=reg-i386.o
+  i[34567]86-*-nto*)	srv_regobj="$srv_i386_regobj"
 			srv_tgtobj="nto-low.o nto-x86-low.o"
+			srv_xmlfiles="$srv_i386_xmlfiles"
 			srv_qnx="yes"
 			;;
   ia64-*-linux*)	srv_regobj=reg-ia64.o
@@ -206,8 +224,9 @@ case "${target}" in
   spu*-*-*)		srv_regobj=reg-spu.o
 			srv_tgtobj="spu-low.o"
 			;;
-  x86_64-*-linux*)	srv_regobj="reg-x86-64-linux.o reg-i386-linux.o"
+  x86_64-*-linux*)	srv_regobj="$srv_amd64_linux_regobj $srv_i386_linux_regobj"
 			srv_tgtobj="linux-low.o linux-x86-low.o i386-low.o i387-fp.o"
+			srv_xmlfiles="$srv_i386_linux_xmlfiles $srv_amd64_linux_xmlfiles"
 			srv_linux_usrregs=yes # This is for i386 progs.
 			srv_linux_regsets=yes
 			srv_linux_thread_db=yes
diff --git a/gdb/gdbserver/linux-x86-low.c b/gdb/gdbserver/linux-x86-low.c
index 0062432..496baa2 100644
--- a/gdb/gdbserver/linux-x86-low.c
+++ b/gdb/gdbserver/linux-x86-low.c
@@ -27,10 +27,10 @@
 
 #include "gdb_proc_service.h"
 
-/* Defined in auto-generated file reg-i386-linux.c.  */
+/* Defined in auto-generated file i386-linux.c.  */
 void init_registers_i386_linux (void);
-/* Defined in auto-generated file reg-x86-64-linux.c.  */
-void init_registers_x86_64_linux (void);
+/* Defined in auto-generated file amd64-linux.c.  */
+void init_registers_amd64_linux (void);
 
 #include <sys/reg.h>
 #include <sys/procfs.h>
@@ -792,7 +792,7 @@ x86_arch_setup (void)
     }
   else if (use_64bit)
     {
-      init_registers_x86_64_linux ();
+      init_registers_amd64_linux ();
 
       /* Amd64 doesn't have HAVE_LINUX_USRREGS.  */
       the_low_target.num_regs = -1;
diff --git a/gdb/i386-linux-nat.c b/gdb/i386-linux-nat.c
index ff837f2..31b9086 100644
--- a/gdb/i386-linux-nat.c
+++ b/gdb/i386-linux-nat.c
@@ -853,6 +853,14 @@ i386_linux_child_post_startup_inferior (ptid_t ptid)
   super_post_startup_inferior (ptid);
 }
 
+/* Get Linux/x86 target description from running target.  */
+
+static const struct target_desc *
+i386_linux_read_description (struct target_ops *ops)
+{
+  return tdesc_i386_linux;
+}
+
 void
 _initialize_i386_linux_nat (void)
 {
@@ -881,6 +889,8 @@ _initialize_i386_linux_nat (void)
   t->to_fetch_registers = i386_linux_fetch_inferior_registers;
   t->to_store_registers = i386_linux_store_inferior_registers;
 
+  t->to_read_description = i386_linux_read_description;
+
   /* Register the target.  */
   linux_nat_add_target (t);
   linux_nat_set_new_thread (t, i386_linux_new_thread);
diff --git a/gdb/i386-linux-tdep.c b/gdb/i386-linux-tdep.c
index 5acd229..b23c109 100644
--- a/gdb/i386-linux-tdep.c
+++ b/gdb/i386-linux-tdep.c
@@ -46,6 +46,8 @@
 #include "linux-record.h"
 #include <stdint.h>
 
+#include "features/i386/i386-linux.c"
+
 /* Supported register note sections.  */
 static struct core_regset_section i386_linux_regset_sections[] =
 {
@@ -55,18 +57,6 @@ static struct core_regset_section i386_linux_regset_sections[] =
   { NULL, 0 }
 };
 
-/* Return the name of register REG.  */
-
-static const char *
-i386_linux_register_name (struct gdbarch *gdbarch, int reg)
-{
-  /* Deal with the extra "orig_eax" pseudo register.  */
-  if (reg == I386_LINUX_ORIG_EAX_REGNUM)
-    return "orig_eax";
-
-  return i386_register_name (gdbarch, reg);
-}
-
 /* Return non-zero, when the register is in the corresponding register
    group.  Put the LINUX_ORIG_EAX register in the system group.  */
 static int
@@ -570,21 +560,57 @@ static int i386_linux_sc_reg_offset[] =
   0 * 4				/* %gs */
 };
 
+/* Get Linux/x86 target description from core dump.  */
+
+static const struct target_desc *
+i386_linux_core_read_description (struct gdbarch *gdbarch,
+				  struct target_ops *target,
+				  bfd *abfd)
+{
+  asection *section = bfd_get_section_by_name (abfd, ".reg2");
+
+  if (section == NULL)
+    return NULL;
+
+  /* Linux/i386.  */
+  return tdesc_i386_linux;
+}
+
 static void
 i386_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  const struct target_desc *tdesc = info.target_desc;
+  struct tdesc_arch_data *tdesc_data = (void *) info.tdep_info;
+  const struct tdesc_feature *feature;
+  int valid_p;
+
+  gdb_assert (tdesc_data);
 
   /* GNU/Linux uses ELF.  */
   i386_elf_init_abi (info, gdbarch);
 
-  /* Since we have the extra "orig_eax" register on GNU/Linux, we have
-     to adjust a few things.  */
+  /* Reserve a number for orig_eax.  */
+  set_gdbarch_num_regs (gdbarch, I386_LINUX_NUM_REGS);
+
+  if (! tdesc_has_registers (tdesc))
+    tdesc = tdesc_i386_linux;
+  tdep->tdesc = tdesc;
+
+  feature = tdesc_find_feature (tdesc, "org.gnu.gdb.i386.linux");
+  if (feature == NULL)
+    return;
 
+  valid_p = tdesc_numbered_register (feature, tdesc_data,
+				     I386_LINUX_ORIG_EAX_REGNUM,
+				     "orig_eax");
+  if (!valid_p)
+    return;
+
+  /* Add the %orig_eax register used for syscall restarting.  */
   set_gdbarch_write_pc (gdbarch, i386_linux_write_pc);
-  set_gdbarch_num_regs (gdbarch, I386_LINUX_NUM_REGS);
-  set_gdbarch_register_name (gdbarch, i386_linux_register_name);
-  set_gdbarch_register_reggroup_p (gdbarch, i386_linux_register_reggroup_p);
+
+  tdep->register_reggroup_p = i386_linux_register_reggroup_p;
 
   tdep->gregset_reg_offset = i386_linux_gregset_reg_offset;
   tdep->gregset_num_regs = ARRAY_SIZE (i386_linux_gregset_reg_offset);
@@ -783,6 +809,9 @@ i386_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   /* Install supported register note sections.  */
   set_gdbarch_core_regset_sections (gdbarch, i386_linux_regset_sections);
 
+  set_gdbarch_core_read_description (gdbarch,
+				     i386_linux_core_read_description);
+
   /* Displaced stepping.  */
   set_gdbarch_displaced_step_copy_insn (gdbarch,
                                         simple_displaced_step_copy_insn);
@@ -808,4 +837,7 @@ _initialize_i386_linux_tdep (void)
 {
   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_LINUX,
 			  i386_linux_init_abi);
+
+  /* Initialize the Linux target description  */
+  initialize_tdesc_i386_linux ();
 }
diff --git a/gdb/i386-linux-tdep.h b/gdb/i386-linux-tdep.h
index e66021d..11f7295 100644
--- a/gdb/i386-linux-tdep.h
+++ b/gdb/i386-linux-tdep.h
@@ -35,4 +35,7 @@
 /* Total number of registers for GNU/Linux.  */
 #define I386_LINUX_NUM_REGS (I386_LINUX_ORIG_EAX_REGNUM + 1)
 
+/* Linux target description.  */
+extern struct target_desc *tdesc_i386_linux;
+
 #endif /* i386-linux-tdep.h */
diff --git a/gdb/i386-nto-tdep.c b/gdb/i386-nto-tdep.c
index 06fc555..09c55e2 100644
--- a/gdb/i386-nto-tdep.c
+++ b/gdb/i386-nto-tdep.c
@@ -122,7 +122,7 @@ i386nto_regset_id (int regno)
     return NTO_REG_END;
   else if (regno < I386_NUM_GREGS)
     return NTO_REG_GENERAL;
-  else if (regno < I386_NUM_GREGS + I386_NUM_FREGS)
+  else if (regno < I386_NUM_GREGS + I387_NUM_REGS)
     return NTO_REG_FLOAT;
   else if (regno < I386_SSE_NUM_REGS)
     return NTO_REG_FLOAT; /* We store xmm registers in fxsave_area.  */
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index 83aa81f..1c188fd 100644
--- a/gdb/i386-tdep.c
+++ b/gdb/i386-tdep.c
@@ -54,9 +54,11 @@
 #include "record.h"
 #include <stdint.h>
 
+#include "features/i386/i386.c"
+
 /* Register names.  */
 
-static char *i386_register_names[] =
+static const char *i386_register_names[] =
 {
   "eax",   "ecx",    "edx",   "ebx",
   "esp",   "ebp",    "esi",   "edi",
@@ -71,11 +73,9 @@ static char *i386_register_names[] =
   "mxcsr"
 };
 
-static const int i386_num_register_names = ARRAY_SIZE (i386_register_names);
-
 /* Register names for MMX pseudo-registers.  */
 
-static char *i386_mmx_names[] =
+static const char *i386_mmx_names[] =
 {
   "mm0", "mm1", "mm2", "mm3",
   "mm4", "mm5", "mm6", "mm7"
@@ -147,16 +147,11 @@ i386_fpc_regnum_p (struct gdbarch *gdbarch, int regnum)
 
 /* Return the name of register REGNUM.  */
 
-const char *
-i386_register_name (struct gdbarch *gdbarch, int regnum)
+static const char *
+i386_pseudo_register_name (struct gdbarch *gdbarch, int regnum)
 {
-  if (i386_mmx_regnum_p (gdbarch, regnum))
-    return i386_mmx_names[regnum - I387_MM0_REGNUM (gdbarch_tdep (gdbarch))];
-
-  if (regnum >= 0 && regnum < i386_num_register_names)
-    return i386_register_names[regnum];
-
-  return NULL;
+  gdb_assert (i386_mmx_regnum_p (gdbarch, regnum));
+  return i386_mmx_names[regnum - I387_MM0_REGNUM (gdbarch_tdep (gdbarch))];
 }
 
 /* Convert a dbx register number REG to the appropriate register
@@ -2112,87 +2107,22 @@ i386_return_value (struct gdbarch *gdbarch, struct type *func_type,
 }
 
 
-/* Construct types for ISA-specific registers.  */
-struct type *
-i386_eflags_type (struct gdbarch *gdbarch)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-
-  if (!tdep->i386_eflags_type)
-    {
-      struct type *type;
-
-      type = arch_flags_type (gdbarch, "builtin_type_i386_eflags", 4);
-      append_flags_type_flag (type, 0, "CF");
-      append_flags_type_flag (type, 1, NULL);
-      append_flags_type_flag (type, 2, "PF");
-      append_flags_type_flag (type, 4, "AF");
-      append_flags_type_flag (type, 6, "ZF");
-      append_flags_type_flag (type, 7, "SF");
-      append_flags_type_flag (type, 8, "TF");
-      append_flags_type_flag (type, 9, "IF");
-      append_flags_type_flag (type, 10, "DF");
-      append_flags_type_flag (type, 11, "OF");
-      append_flags_type_flag (type, 14, "NT");
-      append_flags_type_flag (type, 16, "RF");
-      append_flags_type_flag (type, 17, "VM");
-      append_flags_type_flag (type, 18, "AC");
-      append_flags_type_flag (type, 19, "VIF");
-      append_flags_type_flag (type, 20, "VIP");
-      append_flags_type_flag (type, 21, "ID");
-
-      tdep->i386_eflags_type = type;
-    }
-
-  return tdep->i386_eflags_type;
-}
-
-struct type *
-i386_mxcsr_type (struct gdbarch *gdbarch)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-
-  if (!tdep->i386_mxcsr_type)
-    {
-      struct type *type;
-
-      type = arch_flags_type (gdbarch, "builtin_type_i386_mxcsr", 4);
-      append_flags_type_flag (type, 0, "IE");
-      append_flags_type_flag (type, 1, "DE");
-      append_flags_type_flag (type, 2, "ZE");
-      append_flags_type_flag (type, 3, "OE");
-      append_flags_type_flag (type, 4, "UE");
-      append_flags_type_flag (type, 5, "PE");
-      append_flags_type_flag (type, 6, "DAZ");
-      append_flags_type_flag (type, 7, "IM");
-      append_flags_type_flag (type, 8, "DM");
-      append_flags_type_flag (type, 9, "ZM");
-      append_flags_type_flag (type, 10, "OM");
-      append_flags_type_flag (type, 11, "UM");
-      append_flags_type_flag (type, 12, "PM");
-      append_flags_type_flag (type, 15, "FZ");
-
-      tdep->i386_mxcsr_type = type;
-    }
-
-  return tdep->i386_mxcsr_type;
-}
-
 struct type *
 i387_ext_type (struct gdbarch *gdbarch)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
   if (!tdep->i387_ext_type)
-    tdep->i387_ext_type
-      = arch_float_type (gdbarch, -1, "builtin_type_i387_ext",
-			 floatformats_i387_ext);
+    {
+      tdep->i387_ext_type = tdesc_find_type (gdbarch, "i387_ext");
+      gdb_assert (tdep->i387_ext_type != NULL);
+    }
 
   return tdep->i387_ext_type;
 }
 
 /* Construct vector type for MMX registers.  */
-struct type *
+static struct type *
 i386_mmx_type (struct gdbarch *gdbarch)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
@@ -2233,84 +2163,14 @@ i386_mmx_type (struct gdbarch *gdbarch)
   return tdep->i386_mmx_type;
 }
 
-struct type *
-i386_sse_type (struct gdbarch *gdbarch)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-
-  if (!tdep->i386_sse_type)
-    {
-      const struct builtin_type *bt = builtin_type (gdbarch);
-
-      /* The type we're building is this: */
-#if 0
-      union __gdb_builtin_type_vec128i
-      {
-        int128_t uint128;
-        int64_t v2_int64[2];
-        int32_t v4_int32[4];
-        int16_t v8_int16[8];
-        int8_t v16_int8[16];
-        double v2_double[2];
-        float v4_float[4];
-      };
-#endif
-
-      struct type *t;
-
-      t = arch_composite_type (gdbarch,
-			       "__gdb_builtin_type_vec128i", TYPE_CODE_UNION);
-      append_composite_type_field (t, "v4_float",
-				   init_vector_type (bt->builtin_float, 4));
-      append_composite_type_field (t, "v2_double",
-				   init_vector_type (bt->builtin_double, 2));
-      append_composite_type_field (t, "v16_int8",
-				   init_vector_type (bt->builtin_int8, 16));
-      append_composite_type_field (t, "v8_int16",
-				   init_vector_type (bt->builtin_int16, 8));
-      append_composite_type_field (t, "v4_int32",
-				   init_vector_type (bt->builtin_int32, 4));
-      append_composite_type_field (t, "v2_int64",
-				   init_vector_type (bt->builtin_int64, 2));
-      append_composite_type_field (t, "uint128", bt->builtin_int128);
-
-      TYPE_VECTOR (t) = 1;
-      TYPE_NAME (t) = "builtin_type_vec128i";
-      tdep->i386_sse_type = t;
-    }
-
-  return tdep->i386_sse_type;
-}
-
 /* Return the GDB type object for the "standard" data type of data in
-   register REGNUM.  Perhaps %esi and %edi should go here, but
-   potentially they could be used for things other than address.  */
+   register REGNUM. */
 
 static struct type *
-i386_register_type (struct gdbarch *gdbarch, int regnum)
+i386_pseudo_register_type (struct gdbarch *gdbarch, int regnum)
 {
-  if (regnum == I386_EIP_REGNUM)
-    return builtin_type (gdbarch)->builtin_func_ptr;
-
-  if (regnum == I386_EFLAGS_REGNUM)
-    return i386_eflags_type (gdbarch);
-
-  if (regnum == I386_EBP_REGNUM || regnum == I386_ESP_REGNUM)
-    return builtin_type (gdbarch)->builtin_data_ptr;
-
-  if (i386_fp_regnum_p (gdbarch, regnum))
-    return i387_ext_type (gdbarch);
-
-  if (i386_mmx_regnum_p (gdbarch, regnum))
-    return i386_mmx_type (gdbarch);
-
-  if (i386_sse_regnum_p (gdbarch, regnum))
-    return i386_sse_type (gdbarch);
-
-  if (regnum == I387_MXCSR_REGNUM (gdbarch_tdep (gdbarch)))
-    return i386_mxcsr_type (gdbarch);
-
-  return builtin_type (gdbarch)->builtin_int;
+  gdb_assert (i386_mmx_regnum_p (gdbarch, regnum));
+  return i386_mmx_type (gdbarch);
 }
 
 /* Map a cooked register onto a raw register or memory.  For the i386,
@@ -2761,7 +2621,7 @@ i386_go32_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   /* DJGPP does not support the SSE registers.  */
   tdep->num_xmm_regs = 0;
-  set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I386_NUM_FREGS);
+  set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I387_NUM_REGS);
 
   /* Native compiler is GCC, which uses the SVR4 register numbering
      even in COFF and STABS.  See the comment in i386_gdbarch_init,
@@ -5623,12 +5483,50 @@ i386_fast_tracepoint_valid_at (struct gdbarch *gdbarch,
   return 1;
 }
 
+static int
+i386_validate_tdesc_p (struct gdbarch_tdep *tdep,
+		       struct tdesc_arch_data *tdesc_data)
+{
+  const struct target_desc *tdesc = tdep->tdesc;
+  const struct tdesc_feature *feature_core, *feature_vector;
+  int i, num_regs, valid_p;
+
+  if (! tdesc_has_registers (tdesc))
+    return 0;
+
+  /* Get core registers.  */
+  feature_core = tdesc_find_feature (tdesc, "org.gnu.gdb.i386.core");
+
+  /* Get SSE registers.  */
+  feature_vector = tdesc_find_feature (tdesc, "org.gnu.gdb.i386.sse");
+
+  if (feature_core == NULL || feature_vector == NULL)
+    return 0;
+
+  valid_p = 1;
+
+  num_regs = tdep->num_core_regs;
+  for (i = 0; i < num_regs; i++)
+    valid_p &= tdesc_numbered_register (feature_core, tdesc_data, i,
+					tdep->register_names[i]);
+
+  /* Need to include %mxcsr, so add one.  */
+  num_regs += tdep->num_xmm_regs + 1;
+  for (; i < num_regs; i++)
+    valid_p &= tdesc_numbered_register (feature_vector, tdesc_data, i,
+					tdep->register_names[i]);
+
+  return valid_p;
+}
+
 
 static struct gdbarch *
 i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
 {
   struct gdbarch_tdep *tdep;
   struct gdbarch *gdbarch;
+  struct tdesc_arch_data *tdesc_data;
+  const struct target_desc *tdesc;
 
   /* If there is already a candidate, use it.  */
   arches = gdbarch_list_lookup_by_info (arches, &info);
@@ -5696,12 +5594,6 @@ i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
      alignment.  */
   set_gdbarch_long_double_bit (gdbarch, 96);
 
-  /* The default ABI includes general-purpose registers, 
-     floating-point registers, and the SSE registers.  */
-  set_gdbarch_num_regs (gdbarch, I386_SSE_NUM_REGS);
-  set_gdbarch_register_name (gdbarch, i386_register_name);
-  set_gdbarch_register_type (gdbarch, i386_register_type);
-
   /* Register numbers of various important registers.  */
   set_gdbarch_sp_regnum (gdbarch, I386_ESP_REGNUM); /* %esp */
   set_gdbarch_pc_regnum (gdbarch, I386_EIP_REGNUM); /* %eip */
@@ -5772,11 +5664,6 @@ i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
 
   set_gdbarch_frame_args_skip (gdbarch, 8);
 
-  /* Wire in the MMX registers.  */
-  set_gdbarch_num_pseudo_regs (gdbarch, i386_num_mmx_regs);
-  set_gdbarch_pseudo_register_read (gdbarch, i386_pseudo_register_read);
-  set_gdbarch_pseudo_register_write (gdbarch, i386_pseudo_register_write);
-
   set_gdbarch_print_insn (gdbarch, i386_print_insn);
 
   set_gdbarch_dummy_id (gdbarch, i386_dummy_id);
@@ -5785,7 +5672,7 @@ i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
 
   /* Add the i386 register groups.  */
   i386_add_reggroups (gdbarch);
-  set_gdbarch_register_reggroup_p (gdbarch, i386_register_reggroup_p);
+  tdep->register_reggroup_p = i386_register_reggroup_p;
 
   /* Helper for function argument information.  */
   set_gdbarch_fetch_pointer_argument (gdbarch, i386_fetch_pointer_argument);
@@ -5803,9 +5690,49 @@ i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
 
   frame_base_set_default (gdbarch, &i386_frame_base);
 
+  /* Wire in the MMX registers.  */
+  set_gdbarch_num_pseudo_regs (gdbarch, i386_num_mmx_regs);
+  set_gdbarch_pseudo_register_read (gdbarch, i386_pseudo_register_read);
+  set_gdbarch_pseudo_register_write (gdbarch, i386_pseudo_register_write);
+
+  set_tdesc_pseudo_register_type (gdbarch, i386_pseudo_register_type);
+  set_tdesc_pseudo_register_name (gdbarch, i386_pseudo_register_name);
+
+  /* The default ABI includes general-purpose registers, 
+     floating-point registers, and the SSE registers.  */
+  set_gdbarch_num_regs (gdbarch, I386_SSE_NUM_REGS);
+
+  /* Get the x86 target description from INFO.  */
+  tdesc = info.target_desc;
+  if (! tdesc_has_registers (tdesc))
+    tdesc = tdesc_i386;
+  tdep->tdesc = tdesc;
+
+  tdep->num_core_regs = I386_NUM_GREGS + I387_NUM_REGS;
+  tdep->register_names = i386_register_names;
+
+  tdesc_data = tdesc_data_alloc ();
+
   /* Hook in ABI-specific overrides, if they have been registered.  */
+  info.tdep_info = (void *) tdesc_data;
   gdbarch_init_osabi (info, gdbarch);
 
+  /* Target description may be changed.  */
+  tdesc = tdep->tdesc;
+
+  if (!i386_validate_tdesc_p (tdep, tdesc_data))
+    {
+      tdesc_data_cleanup (tdesc_data);
+      xfree (tdep);
+      gdbarch_free (gdbarch);
+      return NULL;
+    }
+
+  tdesc_use_registers (gdbarch, tdesc, tdesc_data);
+
+  /* Override gdbarch_register_reggroup_p set in tdesc_use_registers.  */
+  set_gdbarch_register_reggroup_p (gdbarch, tdep->register_reggroup_p);
+
   /* Hook in the legacy prologue-based unwinders last (fallback).  */
   frame_unwind_append_unwinder (gdbarch, &i386_sigtramp_frame_unwind);
   frame_unwind_append_unwinder (gdbarch, &i386_frame_unwind);
@@ -5882,4 +5809,7 @@ is \"default\"."),
 
   /* Initialize the i386-specific register groups.  */
   i386_init_reggroups ();
+
+  /* Initialize the standard target descriptions.  */
+  initialize_tdesc_i386 ();
 }
diff --git a/gdb/i386-tdep.h b/gdb/i386-tdep.h
index 5915eb9..a64e5c3 100644
--- a/gdb/i386-tdep.h
+++ b/gdb/i386-tdep.h
@@ -118,9 +118,21 @@ struct gdbarch_tdep
      of MMX support.  */
   int mm0_regnum;
 
+  /* Number of core registers.  */
+  int num_core_regs;
+
   /* Number of SSE registers.  */
   int num_xmm_regs;
 
+  /* Register names.  */
+  const char **register_names;
+
+  /* Target description.  */
+  const struct target_desc *tdesc;
+
+  /* Register group function.  */
+  const void *register_reggroup_p;
+
   /* Offset of saved PC in jmp_buf.  */
   int jb_pc_offset;
 
@@ -147,10 +159,7 @@ struct gdbarch_tdep
   int sc_sp_offset;
 
   /* ISA-specific data types.  */
-  struct type *i386_eflags_type;
-  struct type *i386_mxcsr_type;
   struct type *i386_mmx_type;
-  struct type *i386_sse_type;
   struct type *i387_ext_type;
 
   /* Process record/replay target.  */
@@ -196,7 +205,8 @@ enum i386_regnum
   I386_ES_REGNUM,		/* %es */
   I386_FS_REGNUM,		/* %fs */
   I386_GS_REGNUM,		/* %gs */
-  I386_ST0_REGNUM		/* %st(0) */
+  I386_ST0_REGNUM,		/* %st(0) */
+  I386_MXCSR_REGNUM = 40	/* %mxcsr */ 
 };
 
 /* Register numbers of RECORD_REGMAP.  */
@@ -230,20 +240,14 @@ enum record_i386_regnum
 };
 
 #define I386_NUM_GREGS	16
-#define I386_NUM_FREGS	16
 #define I386_NUM_XREGS  9
 
-#define I386_SSE_NUM_REGS	(I386_NUM_GREGS + I386_NUM_FREGS \
-				 + I386_NUM_XREGS)
+#define I386_SSE_NUM_REGS	(I386_MXCSR_REGNUM + 1)
 
 /* Size of the largest register.  */
 #define I386_MAX_REGISTER_SIZE	16
 
 /* Types for i386-specific registers.  */
-extern struct type *i386_eflags_type (struct gdbarch *gdbarch);
-extern struct type *i386_mxcsr_type (struct gdbarch *gdbarch);
-extern struct type *i386_mmx_type (struct gdbarch *gdbarch);
-extern struct type *i386_sse_type (struct gdbarch *gdbarch);
 extern struct type *i387_ext_type (struct gdbarch *gdbarch);
 
 /* Segment selectors.  */
@@ -263,9 +267,6 @@ extern CORE_ADDR i386_skip_main_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
 /* Return whether the THIS_FRAME corresponds to a sigtramp routine.  */
 extern int i386_sigtramp_p (struct frame_info *this_frame);
 
-/* Return the name of register REGNUM.  */
-extern char const *i386_register_name (struct gdbarch * gdbarch, int regnum);
-
 /* Return non-zero if REGNUM is a member of the specified group.  */
 extern int i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 				     struct reggroup *group);
diff --git a/gdb/i387-tdep.h b/gdb/i387-tdep.h
index 5a08ace..645eb91 100644
--- a/gdb/i387-tdep.h
+++ b/gdb/i387-tdep.h
@@ -27,6 +27,9 @@ struct regcache;
 struct type;
 struct ui_file;
 
+/* Number of i387 floating point registers.  */
+#define I387_NUM_REGS	16
+
 #define I387_ST0_REGNUM(tdep) ((tdep)->st0_regnum)
 #define I387_NUM_XMM_REGS(tdep) ((tdep)->num_xmm_regs)
 #define I387_MM0_REGNUM(tdep) ((tdep)->mm0_regnum)
diff --git a/gdb/regformats/reg-x86-64.dat b/gdb/regformats/i386/amd64-linux.dat
index dd1f78f..02a2c78 100644
--- a/gdb/regformats/reg-x86-64.dat
+++ b/gdb/regformats/i386/amd64-linux.dat
@@ -1,4 +1,6 @@
-name:x86_64
+# DO NOT EDIT: generated from i386/amd64-linux.xml
+name:amd64_linux
+xmltarget:amd64-linux.xml
 expedite:rbp,rsp,rip
 64:rax
 64:rbx
@@ -57,3 +59,4 @@ expedite:rbp,rsp,rip
 128:xmm14
 128:xmm15
 32:mxcsr
+64:orig_rax
diff --git a/gdb/regformats/reg-x86-64-linux.dat b/gdb/regformats/i386/amd64.dat
index 6121db9..d589218 100644
--- a/gdb/regformats/reg-x86-64-linux.dat
+++ b/gdb/regformats/i386/amd64.dat
@@ -1,6 +1,6 @@
-name:x86_64_linux
-xmlarch:i386:x86-64
-osabi:GNU/Linux
+# DO NOT EDIT: generated from i386/amd64.xml
+name:amd64
+xmltarget:amd64.xml
 expedite:rbp,rsp,rip
 64:rax
 64:rbx
@@ -59,4 +59,3 @@ expedite:rbp,rsp,rip
 128:xmm14
 128:xmm15
 32:mxcsr
-64:orig_rax
diff --git a/gdb/regformats/reg-i386-linux.dat b/gdb/regformats/i386/i386-linux.dat
index 33452ac..6fef8d9 100644
--- a/gdb/regformats/reg-i386-linux.dat
+++ b/gdb/regformats/i386/i386-linux.dat
@@ -1,6 +1,6 @@
+# DO NOT EDIT: generated from i386/i386-linux.xml
 name:i386_linux
-xmlarch:i386
-osabi:GNU/Linux
+xmltarget:i386-linux.xml
 expedite:ebp,esp,eip
 32:eax
 32:ecx
diff --git a/gdb/regformats/reg-i386.dat b/gdb/regformats/i386/i386.dat
index 6e30971..923d879 100644
--- a/gdb/regformats/reg-i386.dat
+++ b/gdb/regformats/i386/i386.dat
@@ -1,5 +1,6 @@
+# DO NOT EDIT: generated from i386/i386.xml
 name:i386
-xmlarch:i386
+xmltarget:i386.xml
 expedite:ebp,esp,eip
 32:eax
 32:ecx
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 203aecb..fbc50a7 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2010-03-01  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* gdb.xml/tdesc-regs.exp (architecture): New.  Set it for x86.
+	(load_description): Set architecture if defined.
+
 2010-02-28  Phil Muldoon  <pmuldoon@redhat.com>
 
 	* gdb.python/py-frame.exp: Add read_var block tests.
diff --git a/gdb/testsuite/gdb.xml/tdesc-regs.exp b/gdb/testsuite/gdb.xml/tdesc-regs.exp
index 0922ca3..8eae0bd 100644
--- a/gdb/testsuite/gdb.xml/tdesc-regs.exp
+++ b/gdb/testsuite/gdb.xml/tdesc-regs.exp
@@ -25,6 +25,7 @@ gdb_start
 
 set core-regs ""
 set regdir ""
+set architecture ""
 switch -glob -- [istarget] {
     "*arm-*-*" {
         set core-regs {arm-core.xml}
@@ -55,6 +56,16 @@ switch -glob -- [istarget] {
 	unsupported "register tests"
 	return 0
     }
+    "i?86-*-*" {
+	set architecture "i386"
+	set regdir "i386/"
+        set core-regs {32bit-core.xml 32bit-sse.xml}
+    }
+    "x86_64-*-*" {
+	set architecture "i386:x86-64"
+	set regdir "i386/"
+        set core-regs {64bit-core.xml 64bit-sse.xml}
+    }
 }
 
 # If no core registers were specified, assume this target does not
@@ -89,12 +100,16 @@ proc load_description { file errmsg } {
     global subdir
     global gdb_prompt
     global core-regs
+    global architecture
 
     file delete "$subdir/regs.xml"
     set ifd [open "$srcdir/$subdir/$file" r]
     set ofd [open "$subdir/regs.xml" w]
     while {[gets $ifd line] >= 0} {
 	if {[regexp {<xi:include href="core-regs.xml"/>} $line]} {
+	    if {! [string equal ${architecture} ""]} {
+		puts $ofd "  <architecture>${architecture}</architecture>"
+	    }
 	    foreach src ${core-regs} {
 		puts $ofd "  <xi:include href=\"$src\"/>"
 	    }