diff --git a/MAINTAINERS b/MAINTAINERS
index 5708079..dc02037 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1256,6 +1256,13 @@
 F: include/hw/char/ibex_uart.h
 F: include/hw/intc/ibex_plic.h
 
+RX Machines
+-----------
+rx-gdbsim
+M: Yoshinori Sato <ysato@users.sourceforge.jp>
+S: Maintained
+F: hw/rx/rx-gdbsim.c
+
 SH4 Machines
 ------------
 R2D
diff --git a/default-configs/rx-softmmu.mak b/default-configs/rx-softmmu.mak
index 7c4eb2c..df2b4e4 100644
--- a/default-configs/rx-softmmu.mak
+++ b/default-configs/rx-softmmu.mak
@@ -1,2 +1,3 @@
 # Default configuration for rx-softmmu
 
+CONFIG_RX_GDBSIM=y
diff --git a/hw/rx/Kconfig b/hw/rx/Kconfig
index e7b1c59..2b297c5 100644
--- a/hw/rx/Kconfig
+++ b/hw/rx/Kconfig
@@ -4,3 +4,7 @@
     select RENESAS_TMR
     select RENESAS_CMT
     select RENESAS_SCI
+
+config RX_GDBSIM
+    bool
+    select RX62N_MCU
diff --git a/hw/rx/Makefile.objs b/hw/rx/Makefile.objs
index fe19ee7..4ef6b9e 100644
--- a/hw/rx/Makefile.objs
+++ b/hw/rx/Makefile.objs
@@ -1 +1,2 @@
 obj-$(CONFIG_RX62N_MCU) += rx62n.o
+obj-$(CONFIG_RX_GDBSIM) += rx-gdbsim.o
diff --git a/hw/rx/rx-gdbsim.c b/hw/rx/rx-gdbsim.c
new file mode 100644
index 0000000..b8a56fa
--- /dev/null
+++ b/hw/rx/rx-gdbsim.c
@@ -0,0 +1,198 @@
+/*
+ * RX QEMU GDB simulator
+ *
+ * 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/cutils.h"
+#include "qemu/error-report.h"
+#include "qapi/error.h"
+#include "qemu-common.h"
+#include "cpu.h"
+#include "hw/hw.h"
+#include "hw/sysbus.h"
+#include "hw/loader.h"
+#include "hw/rx/rx62n.h"
+#include "sysemu/sysemu.h"
+#include "sysemu/qtest.h"
+#include "sysemu/device_tree.h"
+#include "hw/boards.h"
+
+/* Same address of GDB integrated simulator */
+#define SDRAM_BASE  EXT_CS_BASE
+
+typedef struct RxGdbSimMachineClass {
+    /*< private >*/
+    MachineClass parent_class;
+    /*< public >*/
+    const char *mcu_name;
+    uint32_t xtal_freq_hz;
+} RxGdbSimMachineClass;
+
+typedef struct RxGdbSimMachineState {
+    /*< private >*/
+    MachineState parent_obj;
+    /*< public >*/
+    RX62NState mcu;
+} RxGdbSimMachineState;
+
+#define TYPE_RX_GDBSIM_MACHINE MACHINE_TYPE_NAME("rx62n-common")
+
+#define RX_GDBSIM_MACHINE(obj) \
+    OBJECT_CHECK(RxGdbSimMachineState, (obj), TYPE_RX_GDBSIM_MACHINE)
+
+#define RX_GDBSIM_MACHINE_CLASS(klass) \
+    OBJECT_CLASS_CHECK(RxGdbSimMachineClass, (klass), TYPE_RX_GDBSIM_MACHINE)
+#define RX_GDBSIM_MACHINE_GET_CLASS(obj) \
+    OBJECT_GET_CLASS(RxGdbSimMachineClass, (obj), TYPE_RX_GDBSIM_MACHINE)
+
+static void rx_load_image(RXCPU *cpu, const char *filename,
+                          uint32_t start, uint32_t size)
+{
+    static uint32_t extable[32];
+    long kernel_size;
+    int i;
+
+    kernel_size = load_image_targphys(filename, start, size);
+    if (kernel_size < 0) {
+        fprintf(stderr, "qemu: could not load kernel '%s'\n", filename);
+        exit(1);
+    }
+    cpu->env.pc = start;
+
+    /* setup exception trap trampoline */
+    /* linux kernel only works little-endian mode */
+    for (i = 0; i < ARRAY_SIZE(extable); i++) {
+        extable[i] = cpu_to_le32(0x10 + i * 4);
+    }
+    rom_add_blob_fixed("extable", extable, sizeof(extable), VECTOR_TABLE_BASE);
+}
+
+static void rx_gdbsim_init(MachineState *machine)
+{
+    MachineClass *mc = MACHINE_GET_CLASS(machine);
+    RxGdbSimMachineState *s = RX_GDBSIM_MACHINE(machine);
+    RxGdbSimMachineClass *rxc = RX_GDBSIM_MACHINE_GET_CLASS(machine);
+    MemoryRegion *sysmem = get_system_memory();
+    const char *kernel_filename = machine->kernel_filename;
+    const char *dtb_filename = machine->dtb;
+
+    if (machine->ram_size < mc->default_ram_size) {
+        char *sz = size_to_str(mc->default_ram_size);
+        error_report("Invalid RAM size, should be more than %s", sz);
+        g_free(sz);
+    }
+
+    /* Allocate memory space */
+    memory_region_add_subregion(sysmem, SDRAM_BASE, machine->ram);
+
+    /* Initialize MCU */
+    object_initialize_child(OBJECT(machine), "mcu", &s->mcu, rxc->mcu_name);
+    object_property_set_link(OBJECT(&s->mcu), OBJECT(sysmem),
+                             "main-bus", &error_abort);
+    object_property_set_uint(OBJECT(&s->mcu), rxc->xtal_freq_hz,
+                             "xtal-frequency-hz", &error_abort);
+    object_property_set_bool(OBJECT(&s->mcu), kernel_filename != NULL,
+                             "load-kernel", &error_abort);
+    qdev_realize(DEVICE(&s->mcu), NULL, &error_abort);
+
+    /* Load kernel and dtb */
+    if (kernel_filename) {
+        ram_addr_t kernel_offset;
+
+        /*
+         * The kernel image is loaded into
+         * the latter half of the SDRAM space.
+         */
+        kernel_offset = machine->ram_size / 2;
+        rx_load_image(RXCPU(first_cpu), kernel_filename,
+                      SDRAM_BASE + kernel_offset, kernel_offset);
+        if (dtb_filename) {
+            ram_addr_t dtb_offset;
+            int dtb_size;
+            void *dtb;
+
+            dtb = load_device_tree(dtb_filename, &dtb_size);
+            if (dtb == NULL) {
+                error_report("Couldn't open dtb file %s", dtb_filename);
+                exit(1);
+            }
+            if (machine->kernel_cmdline &&
+                qemu_fdt_setprop_string(dtb, "/chosen", "bootargs",
+                                        machine->kernel_cmdline) < 0) {
+                error_report("Couldn't set /chosen/bootargs");
+                exit(1);
+            }
+            /* DTB is located at the end of SDRAM space. */
+            dtb_offset = machine->ram_size - dtb_size;
+            rom_add_blob_fixed("dtb", dtb, dtb_size,
+                               SDRAM_BASE + dtb_offset);
+            /* Set dtb address to R1 */
+            RXCPU(first_cpu)->env.regs[1] = SDRAM_BASE + dtb_offset;
+        }
+    }
+}
+
+static void rx_gdbsim_class_init(ObjectClass *oc, void *data)
+{
+    MachineClass *mc = MACHINE_CLASS(oc);
+
+    mc->init = rx_gdbsim_init;
+    mc->default_cpu_type = TYPE_RX62N_CPU;
+    mc->default_ram_size = 16 * MiB;
+    mc->default_ram_id = "ext-sdram";
+}
+
+static void rx62n7_class_init(ObjectClass *oc, void *data)
+{
+    RxGdbSimMachineClass *rxc = RX_GDBSIM_MACHINE_CLASS(oc);
+    MachineClass *mc = MACHINE_CLASS(oc);
+
+    rxc->mcu_name = TYPE_R5F562N7_MCU;
+    rxc->xtal_freq_hz = 12 * 1000 * 1000;
+    mc->desc = "gdb simulator (R5F562N7 MCU and external RAM)";
+};
+
+static void rx62n8_class_init(ObjectClass *oc, void *data)
+{
+    RxGdbSimMachineClass *rxc = RX_GDBSIM_MACHINE_CLASS(oc);
+    MachineClass *mc = MACHINE_CLASS(oc);
+
+    rxc->mcu_name = TYPE_R5F562N8_MCU;
+    rxc->xtal_freq_hz = 12 * 1000 * 1000;
+    mc->desc = "gdb simulator (R5F562N8 MCU and external RAM)";
+};
+
+static const TypeInfo rx_gdbsim_types[] = {
+    {
+        .name           = MACHINE_TYPE_NAME("gdbsim-r5f562n7"),
+        .parent         = TYPE_RX_GDBSIM_MACHINE,
+        .class_init     = rx62n7_class_init,
+    }, {
+        .name           = MACHINE_TYPE_NAME("gdbsim-r5f562n8"),
+        .parent         = TYPE_RX_GDBSIM_MACHINE,
+        .class_init     = rx62n8_class_init,
+    }, {
+        .name           = TYPE_RX_GDBSIM_MACHINE,
+        .parent         = TYPE_MACHINE,
+        .instance_size  = sizeof(RxGdbSimMachineState),
+        .class_size     = sizeof(RxGdbSimMachineClass),
+        .class_init     = rx_gdbsim_class_init,
+        .abstract       = true,
+     }
+};
+
+DEFINE_TYPES(rx_gdbsim_types)
diff --git a/include/hw/rx/rx62n.h b/include/hw/rx/rx62n.h
index 1d3e6a5..aa94758 100644
--- a/include/hw/rx/rx62n.h
+++ b/include/hw/rx/rx62n.h
@@ -37,6 +37,10 @@
 #define TYPE_R5F562N7_MCU "r5f562n7-mcu"
 #define TYPE_R5F562N8_MCU "r5f562n8-mcu"
 
+#define EXT_CS_BASE         0x01000000
+#define VECTOR_TABLE_BASE   0xffffff80
+#define RX62N_CFLASH_BASE   0xfff80000
+
 #define RX62N_NR_TMR    2
 #define RX62N_NR_CMT    2
 #define RX62N_NR_SCI    6