diff --git a/target-s390x/cpu-qom.h b/target-s390x/cpu-qom.h
index f9c96d1..80dd741 100644
--- a/target-s390x/cpu-qom.h
+++ b/target-s390x/cpu-qom.h
@@ -89,5 +89,6 @@ hwaddr s390_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
 hwaddr s390_cpu_get_phys_addr_debug(CPUState *cpu, vaddr addr);
 int s390_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg);
 int s390_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
+void s390_cpu_gdb_init(CPUState *cs);
 
 #endif
diff --git a/target-s390x/cpu.c b/target-s390x/cpu.c
index c3082b7..4b03e42 100644
--- a/target-s390x/cpu.c
+++ b/target-s390x/cpu.c
@@ -174,6 +174,7 @@ static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
     CPUState *cs = CPU(dev);
     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 
+    s390_cpu_gdb_init(cs);
     qemu_init_vcpu(cs);
     cpu_reset(cs);
 
@@ -259,7 +260,8 @@ static void s390_cpu_class_init(ObjectClass *oc, void *data)
     cc->write_elf64_qemunote = s390_cpu_write_elf64_qemunote;
 #endif
     dc->vmsd = &vmstate_s390_cpu;
-    cc->gdb_num_core_regs = S390_NUM_REGS;
+    cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
+    cc->gdb_core_xml_file = "s390x-core64.xml";
 }
 
 static const TypeInfo s390_cpu_type_info = {
diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
index b13761d..525f969 100644
--- a/target-s390x/cpu.h
+++ b/target-s390x/cpu.h
@@ -551,44 +551,8 @@ void s390_cpu_list(FILE *f, fprintf_function cpu_fprintf);
 #define S390_R13_REGNUM 15
 #define S390_R14_REGNUM 16
 #define S390_R15_REGNUM 17
-/* Access Registers.  */
-#define S390_A0_REGNUM 18
-#define S390_A1_REGNUM 19
-#define S390_A2_REGNUM 20
-#define S390_A3_REGNUM 21
-#define S390_A4_REGNUM 22
-#define S390_A5_REGNUM 23
-#define S390_A6_REGNUM 24
-#define S390_A7_REGNUM 25
-#define S390_A8_REGNUM 26
-#define S390_A9_REGNUM 27
-#define S390_A10_REGNUM 28
-#define S390_A11_REGNUM 29
-#define S390_A12_REGNUM 30
-#define S390_A13_REGNUM 31
-#define S390_A14_REGNUM 32
-#define S390_A15_REGNUM 33
-/* Floating Point Control Word.  */
-#define S390_FPC_REGNUM 34
-/* Floating Point Registers.  */
-#define S390_F0_REGNUM 35
-#define S390_F1_REGNUM 36
-#define S390_F2_REGNUM 37
-#define S390_F3_REGNUM 38
-#define S390_F4_REGNUM 39
-#define S390_F5_REGNUM 40
-#define S390_F6_REGNUM 41
-#define S390_F7_REGNUM 42
-#define S390_F8_REGNUM 43
-#define S390_F9_REGNUM 44
-#define S390_F10_REGNUM 45
-#define S390_F11_REGNUM 46
-#define S390_F12_REGNUM 47
-#define S390_F13_REGNUM 48
-#define S390_F14_REGNUM 49
-#define S390_F15_REGNUM 50
-/* Total.  */
-#define S390_NUM_REGS 51
+/* Total Core Registers. */
+#define S390_NUM_CORE_REGS 18
 
 /* CC optimization */
 
diff --git a/target-s390x/gdbstub.c b/target-s390x/gdbstub.c
index 8d55006..cda8053 100644
--- a/target-s390x/gdbstub.c
+++ b/target-s390x/gdbstub.c
@@ -42,14 +42,7 @@ int s390_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
         return gdb_get_regl(mem_buf, env->psw.addr);
     case S390_R0_REGNUM ... S390_R15_REGNUM:
         return gdb_get_regl(mem_buf, env->regs[n-S390_R0_REGNUM]);
-    case S390_A0_REGNUM ... S390_A15_REGNUM:
-        return gdb_get_reg32(mem_buf, env->aregs[n-S390_A0_REGNUM]);
-    case S390_FPC_REGNUM:
-        return gdb_get_reg32(mem_buf, env->fpc);
-    case S390_F0_REGNUM ... S390_F15_REGNUM:
-        return gdb_get_reg64(mem_buf, env->fregs[n-S390_F0_REGNUM].ll);
     }
-
     return 0;
 }
 
@@ -57,11 +50,7 @@ int s390_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
 {
     S390CPU *cpu = S390_CPU(cs);
     CPUS390XState *env = &cpu->env;
-    target_ulong tmpl;
-    uint32_t tmp32;
-    int r = 8;
-    tmpl = ldtul_p(mem_buf);
-    tmp32 = ldl_p(mem_buf);
+    target_ulong tmpl = ldtul_p(mem_buf);
 
     switch (n) {
     case S390_PSWM_REGNUM:
@@ -76,19 +65,79 @@ int s390_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
     case S390_R0_REGNUM ... S390_R15_REGNUM:
         env->regs[n-S390_R0_REGNUM] = tmpl;
         break;
+    default:
+        return 0;
+    }
+    return 8;
+}
+
+/* the values represent the positions in s390-acr.xml */
+#define S390_A0_REGNUM 0
+#define S390_A15_REGNUM 15
+/* total number of registers in s390-acr.xml */
+#define S390_NUM_AC_REGS 16
+
+static int cpu_read_ac_reg(CPUS390XState *env, uint8_t *mem_buf, int n)
+{
+    switch (n) {
     case S390_A0_REGNUM ... S390_A15_REGNUM:
-        env->aregs[n-S390_A0_REGNUM] = tmp32;
-        r = 4;
-        break;
+        return gdb_get_reg32(mem_buf, env->aregs[n]);
+    default:
+        return 0;
+    }
+}
+
+static int cpu_write_ac_reg(CPUS390XState *env, uint8_t *mem_buf, int n)
+{
+    switch (n) {
+    case S390_A0_REGNUM ... S390_A15_REGNUM:
+        env->aregs[n] = ldl_p(mem_buf);
+        return 4;
+    default:
+        return 0;
+    }
+}
+
+/* the values represent the positions in s390-fpr.xml */
+#define S390_FPC_REGNUM 0
+#define S390_F0_REGNUM 1
+#define S390_F15_REGNUM 16
+/* total number of registers in s390-fpr.xml */
+#define S390_NUM_FP_REGS 17
+
+static int cpu_read_fp_reg(CPUS390XState *env, uint8_t *mem_buf, int n)
+{
+    switch (n) {
     case S390_FPC_REGNUM:
-        env->fpc = tmp32;
-        r = 4;
-        break;
+        return gdb_get_reg32(mem_buf, env->fpc);
     case S390_F0_REGNUM ... S390_F15_REGNUM:
-        env->fregs[n-S390_F0_REGNUM].ll = tmpl;
-        break;
+        return gdb_get_reg64(mem_buf, env->fregs[n - S390_F0_REGNUM].ll);
     default:
         return 0;
     }
-    return r;
+}
+
+static int cpu_write_fp_reg(CPUS390XState *env, uint8_t *mem_buf, int n)
+{
+    switch (n) {
+    case S390_FPC_REGNUM:
+        env->fpc = ldl_p(mem_buf);
+        return 4;
+    case S390_F0_REGNUM ... S390_F15_REGNUM:
+        env->fregs[n - S390_F0_REGNUM].ll = ldtul_p(mem_buf);
+        return 8;
+    default:
+        return 0;
+    }
+}
+
+void s390_cpu_gdb_init(CPUState *cs)
+{
+    gdb_register_coprocessor(cs, cpu_read_ac_reg,
+                             cpu_write_ac_reg,
+                             S390_NUM_AC_REGS, "s390-acr.xml", 0);
+
+    gdb_register_coprocessor(cs, cpu_read_fp_reg,
+                             cpu_write_fp_reg,
+                             S390_NUM_FP_REGS, "s390-fpr.xml", 0);
 }
