diff --git a/gdb/features/Makefile b/gdb/features/Makefile
index 0c84faf405..2b65d46df0 100644
--- a/gdb/features/Makefile
+++ b/gdb/features/Makefile
@@ -161,6 +161,7 @@ XMLTOC = \
 	rs6000/powerpc-vsx64.xml \
 	rs6000/powerpc-vsx64l.xml \
 	rs6000/rs6000.xml \
+	rx.xml \
 	s390-linux32.xml \
 	s390-linux32v1.xml \
 	s390-linux32v2.xml \
@@ -238,6 +239,7 @@ FEATURE_XMLFILES = aarch64-core.xml \
 	riscv/64bit-cpu.xml \
 	riscv/64bit-csr.xml \
 	riscv/64bit-fpu.xml \
+	rx.xml \
 	tic6x-c6xp.xml \
 	tic6x-core.xml \
 	tic6x-gp.xml
diff --git a/gdb/features/rx.xml b/gdb/features/rx.xml
new file mode 100644
index 0000000000..b5aa9ac4a8
--- /dev/null
+++ b/gdb/features/rx.xml
@@ -0,0 +1,70 @@
+<?xml version="1.0"?>
+<!-- Copyright (C) 2019 Free Software Foundation, Inc.
+
+     Copying and distribution of this file, with or without modification,
+     are permitted in any medium without royalty provided the copyright
+     notice and this notice are preserved.  -->
+
+<!DOCTYPE feature SYSTEM "gdb-target.dtd">
+<feature name="org.gnu.gdb.rx.core">
+  <reg name="r0" bitsize="32" type="data_ptr"/>
+  <reg name="r1" bitsize="32" type="uint32"/>
+  <reg name="r2" bitsize="32" type="uint32"/>
+  <reg name="r3" bitsize="32" type="uint32"/>
+  <reg name="r4" bitsize="32" type="uint32"/>
+  <reg name="r5" bitsize="32" type="uint32"/>
+  <reg name="r6" bitsize="32" type="uint32"/>
+  <reg name="r7" bitsize="32" type="uint32"/>
+  <reg name="r8" bitsize="32" type="uint32"/>
+  <reg name="r9" bitsize="32" type="uint32"/>
+  <reg name="r10" bitsize="32" type="uint32"/>
+  <reg name="r11" bitsize="32" type="uint32"/>
+  <reg name="r12" bitsize="32" type="uint32"/>
+  <reg name="r13" bitsize="32" type="uint32"/>
+  <reg name="r14" bitsize="32" type="uint32"/>
+  <reg name="r15" bitsize="32" type="uint32"/>
+
+  <flags id="psw_flags" size="4">
+    <field name="C" start="0" end="0"/>
+    <field name="Z" start="1" end="1"/>
+    <field name="S" start="2" end="2"/>
+    <field name="O" start="3" end="3"/>
+    <field name="I" start="16" end="16"/>
+    <field name="U" start="17" end="17"/>
+    <field name="PM" start="20" end="20"/>
+    <field name="IPL" start="24" end="27"/>
+  </flags>
+
+  <flags id="fpsw_flags" size="4">
+    <field name="RM" start="0" end="1"/>
+    <field name="CV" start="2" end="2"/>
+    <field name="CO" start="3" end="3"/>
+    <field name="CZ" start="4" end="4"/>
+    <field name="CU" start="5" end="5"/>
+    <field name="CX" start="6" end="6"/>
+    <field name="CE" start="7" end="7"/>
+    <field name="DN" start="8" end="8"/>
+    <field name="EV" start="10" end="10"/>
+    <field name="EO" start="11" end="11"/>
+    <field name="EZ" start="12" end="12"/>
+    <field name="EU" start="13" end="13"/>
+    <field name="EX" start="14" end="14"/>
+    <field name="FV" start="26" end="26"/>
+    <field name="FO" start="27" end="27"/>
+    <field name="FZ" start="28" end="28"/>
+    <field name="FU" start="29" end="29"/>
+    <field name="FX" start="30" end="30"/>
+    <field name="FS" start="31" end="31"/>
+  </flags>
+
+  <reg name="usp" bitsize="32" type="data_ptr"/>
+  <reg name="isp" bitsize="32" type="data_ptr"/>
+  <reg name="psw" bitsize="32" type="psw_flags"/>
+  <reg name="pc" bitsize="32" type="code_ptr"/>
+  <reg name="intb" bitsize="32" type="data_ptr"/>
+  <reg name="bpsw" bitsize="32" type="psw_flags"/>
+  <reg name="bpc" bitsize="32" type="code_ptr"/>
+  <reg name="fintv" bitsize="32" type="code_ptr"/>
+  <reg name="fpsw" bitsize="32" type="fpsw_flags"/>
+  <reg name="acc" bitsize="64" type="uint64"/>
+</feature>
diff --git a/gdb/rx-tdep.c b/gdb/rx-tdep.c
index 4cbf919db9..b3398f122a 100644
--- a/gdb/rx-tdep.c
+++ b/gdb/rx-tdep.c
@@ -33,11 +33,15 @@
 #include "value.h"
 #include "gdbcore.h"
 #include "dwarf2-frame.h"
+#include "remote.h"
+#include "target-descriptions.h"
 
 #include "elf/rx.h"
 #include "elf-bfd.h"
 #include <algorithm>
 
+#include "features/rx.c"
+
 /* Certain important register numbers.  */
 enum
 {
@@ -114,40 +118,21 @@ struct rx_prologue
   int reg_offset[RX_NUM_REGS];
 };
 
+static const char *const rx_register_names[] = {
+  "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
+  "r8",  "r9",  "r10", "r11", "r12", "r13", "r14", "r15",
+  "usp", "isp", "psw", "pc",  "intb", "bpsw","bpc","fintv",
+  "fpsw", "acc",
+};
+
 /* Implement the "register_name" gdbarch method.  */
 static const char *
 rx_register_name (struct gdbarch *gdbarch, int regnr)
 {
-  static const char *const reg_names[] = {
-    "r0",
-    "r1",
-    "r2",
-    "r3",
-    "r4",
-    "r5",
-    "r6",
-    "r7",
-    "r8",
-    "r9",
-    "r10",
-    "r11",
-    "r12",
-    "r13",
-    "r14",
-    "r15",
-    "usp",
-    "isp",
-    "psw",
-    "pc",
-    "intb",
-    "bpsw",
-    "bpc",
-    "fintv",
-    "fpsw",
-    "acc"
-  };
-
-  return reg_names[regnr];
+  if (regnr >= 0 && regnr < RX_NUM_REGS)
+    return rx_register_names[regnr];
+  else
+    return NULL;
 }
 
 /* Construct the flags type for PSW and BPSW.  */
@@ -1037,6 +1022,14 @@ rx_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
     return -1;
 }
 
+static void
+rx_register_g_packet_guesses (struct gdbarch *gdbarch)
+{
+  register_remote_g_packet_guess (gdbarch,
+                                  4 * RX_NUM_REGS,
+                                  tdesc_rx);
+}
+
 /* Allocate and initialize a gdbarch object.  */
 static struct gdbarch *
 rx_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
@@ -1044,6 +1037,8 @@ rx_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   struct gdbarch *gdbarch;
   struct gdbarch_tdep *tdep;
   int elf_flags;
+  struct tdesc_arch_data *tdesc_data = NULL;
+  const struct target_desc *tdesc = info.target_desc;
 
   /* Extract the elf_flags if available.  */
   if (info.abfd != NULL
@@ -1065,8 +1060,33 @@ rx_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
       return arches->gdbarch;
     }
 
-  /* None found, create a new architecture from the information
-     provided.  */
+  if (tdesc == NULL)
+      tdesc = tdesc_rx;
+
+  /* Check any target description for validity.  */
+  if (tdesc_has_registers (tdesc))
+    {
+      const struct tdesc_feature *feature;
+      int valid_p = 0;
+      int i = 0;
+      feature = tdesc_find_feature (tdesc, "org.gnu.gdb.rx.core");
+
+      if (feature != NULL)
+	{
+	  tdesc_data = tdesc_data_alloc ();
+	  valid_p = 1;
+	  for (i = 0; i < RX_NUM_REGS; i++)
+	    valid_p &= tdesc_numbered_register (feature, tdesc_data, i,
+                                            rx_register_names[i]);
+	}
+
+      if (!valid_p)
+	{
+	  tdesc_data_cleanup (tdesc_data);
+	  return NULL;
+	}
+    }
+
   tdep = XCNEW (struct gdbarch_tdep);
   gdbarch = gdbarch_alloc (&info, tdep);
   tdep->elf_flags = elf_flags;
@@ -1083,15 +1103,6 @@ rx_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   set_gdbarch_sw_breakpoint_from_kind (gdbarch, rx_breakpoint::bp_from_kind);
   set_gdbarch_skip_prologue (gdbarch, rx_skip_prologue);
 
-  /* Target builtin data types.  */
-  set_gdbarch_char_signed (gdbarch, 0);
-  set_gdbarch_short_bit (gdbarch, 16);
-  set_gdbarch_int_bit (gdbarch, 32);
-  set_gdbarch_long_bit (gdbarch, 32);
-  set_gdbarch_long_long_bit (gdbarch, 64);
-  set_gdbarch_ptr_bit (gdbarch, 32);
-  set_gdbarch_float_bit (gdbarch, 32);
-  set_gdbarch_float_format (gdbarch, floatformats_ieee_single);
   if (elf_flags & E_FLAG_RX_64BIT_DOUBLES)
     {
       set_gdbarch_double_bit (gdbarch, 64);
@@ -1115,6 +1126,8 @@ rx_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   dwarf2_append_unwinders (gdbarch);
   frame_unwind_append_unwinder (gdbarch, &rx_frame_unwind);
 
+  rx_register_g_packet_guesses (gdbarch);
+
   /* Methods setting up a dummy call, and extracting the return value from
      a call.  */
   set_gdbarch_push_dummy_call (gdbarch, rx_push_dummy_call);
@@ -1123,6 +1136,9 @@ rx_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   /* Virtual tables.  */
   set_gdbarch_vbit_in_delta (gdbarch, 1);
 
+  if (tdesc_data != NULL)
+    tdesc_use_registers (gdbarch, tdesc, tdesc_data);
+
   return gdbarch;
 }
 
@@ -1132,4 +1148,5 @@ void
 _initialize_rx_tdep (void)
 {
   register_gdbarch_init (bfd_arch_rx, rx_gdbarch_init);
+  initialize_tdesc_rx ();
 }
