diff --git a/target/rx/gdbstub.c b/target/rx/gdbstub.c
new file mode 100644
index 0000000000..d76ca52e82
--- /dev/null
+++ b/target/rx/gdbstub.c
@@ -0,0 +1,112 @@
+/*
+ * RX gdb server stub
+ *
+ * Copyright (c) 2019 Yoshinori Sato
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2 or later, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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 "qemu/osdep.h"
+#include "qemu-common.h"
+#include "cpu.h"
+#include "exec/gdbstub.h"
+
+int rx_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
+{
+    RXCPU *cpu = RXCPU(cs);
+    CPURXState *env = &cpu->env;
+
+    switch (n) {
+    case 0 ... 15:
+        return gdb_get_regl(mem_buf, env->regs[n]);
+    case 16:
+        return gdb_get_regl(mem_buf, (env->psw_u) ? env->regs[0] : env->usp);
+    case 17:
+        return gdb_get_regl(mem_buf, (!env->psw_u) ? env->regs[0] : env->isp);
+    case 18:
+        return gdb_get_regl(mem_buf, rx_cpu_pack_psw(env));
+    case 19:
+        return gdb_get_regl(mem_buf, env->pc);
+    case 20:
+        return gdb_get_regl(mem_buf, env->intb);
+    case 21:
+        return gdb_get_regl(mem_buf, env->bpsw);
+    case 22:
+        return gdb_get_regl(mem_buf, env->bpc);
+    case 23:
+        return gdb_get_regl(mem_buf, env->fintv);
+    case 24:
+        return gdb_get_regl(mem_buf, env->fpsw);
+    case 25:
+        return 0;
+    }
+    return 0;
+}
+
+int rx_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
+{
+    RXCPU *cpu = RXCPU(cs);
+    CPURXState *env = &cpu->env;
+    uint32_t psw;
+    switch (n) {
+    case 0 ... 15:
+        env->regs[n] = ldl_p(mem_buf);
+        if (n == 0) {
+            if (env->psw_u) {
+                env->usp = env->regs[0];
+            } else {
+                env->isp = env->regs[0];
+            }
+        }
+        break;
+    case 16:
+        env->usp = ldl_p(mem_buf);
+        if (env->psw_u) {
+            env->regs[0] = ldl_p(mem_buf);
+        }
+        break;
+    case 17:
+        env->isp = ldl_p(mem_buf);
+        if (!env->psw_u) {
+            env->regs[0] = ldl_p(mem_buf);
+        }
+        break;
+    case 18:
+        psw = ldl_p(mem_buf);
+        rx_cpu_unpack_psw(env, psw, 1);
+        break;
+    case 19:
+        env->pc = ldl_p(mem_buf);
+        break;
+    case 20:
+        env->intb = ldl_p(mem_buf);
+        break;
+    case 21:
+        env->bpsw = ldl_p(mem_buf);
+        break;
+    case 22:
+        env->bpc = ldl_p(mem_buf);
+        break;
+    case 23:
+        env->fintv = ldl_p(mem_buf);
+        break;
+    case 24:
+        env->fpsw = ldl_p(mem_buf);
+        break;
+    case 25:
+        return 8;
+    default:
+        return 0;
+    }
+
+    return 4;
+}
diff --git a/target/rx/monitor.c b/target/rx/monitor.c
new file mode 100644
index 0000000000..5d7a1e58b5
--- /dev/null
+++ b/target/rx/monitor.c
@@ -0,0 +1,38 @@
+/*
+ * QEMU monitor
+ *
+ * Copyright (c) 2003-2004 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "monitor/monitor.h"
+#include "monitor/hmp-target.h"
+#include "hmp.h"
+
+void hmp_info_tlb(Monitor *mon, const QDict *qdict)
+{
+    CPUArchState *env = mon_get_cpu_env();
+
+    if (!env) {
+        monitor_printf(mon, "No CPU available\n");
+        return;
+    }
+}
diff --git a/target/rx/Makefile.objs b/target/rx/Makefile.objs
new file mode 100644
index 0000000000..f63e1ca43f
--- /dev/null
+++ b/target/rx/Makefile.objs
@@ -0,0 +1,11 @@
+obj-y += translate.o op_helper.o helper.o cpu.o gdbstub.o disas.o
+obj-$(CONFIG_SOFTMMU) += monitor.o
+
+DECODETREE = $(SRC_PATH)/scripts/decodetree.py
+
+target/rx/decode.inc.c: \
+  $(SRC_PATH)/target/rx/insns.decode $(DECODETREE)
+	$(call quiet-command,\
+	  $(PYTHON) $(DECODETREE) --varinsnwidth 32 -o $@ $<, "GEN", $(TARGET_DIR)$@)
+
+target/rx/translate.o: target/rx/decode.inc.c
