diff --git a/gdbstub.c b/gdbstub.c
index 6cefb17..9e017ed 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -42,15 +42,16 @@
 #include "sysemu/kvm.h"
 #include "qemu/bitops.h"
 
-#ifndef TARGET_CPU_MEMORY_RW_DEBUG
-static inline int target_memory_rw_debug(CPUArchState *env, target_ulong addr,
-                                         uint8_t *buf, int len, int is_write)
+static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr,
+                                         uint8_t *buf, int len, bool is_write)
 {
-    return cpu_memory_rw_debug(ENV_GET_CPU(env), addr, buf, len, is_write);
+    CPUClass *cc = CPU_GET_CLASS(cpu);
+
+    if (cc->memory_rw_debug) {
+        return cc->memory_rw_debug(cpu, addr, buf, len, is_write);
+    }
+    return cpu_memory_rw_debug(cpu, addr, buf, len, is_write);
 }
-#else
-/* target_memory_rw_debug() defined in cpu.h */
-#endif
 
 enum {
     GDB_SIGNAL_0 = 0,
@@ -2248,7 +2249,8 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
         if (*p == ',')
             p++;
         len = strtoull(p, NULL, 16);
-        if (target_memory_rw_debug(s->g_cpu, addr, mem_buf, len, 0) != 0) {
+        if (target_memory_rw_debug(ENV_GET_CPU(s->g_cpu), addr, mem_buf, len,
+                                   false) != 0) {
             put_packet (s, "E14");
         } else {
             memtohex(buf, mem_buf, len);
@@ -2263,7 +2265,8 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
         if (*p == ':')
             p++;
         hextomem(mem_buf, p, len);
-        if (target_memory_rw_debug(s->g_cpu, addr, mem_buf, len, 1) != 0) {
+        if (target_memory_rw_debug(ENV_GET_CPU(s->g_cpu), addr, mem_buf, len,
+                                   true) != 0) {
             put_packet(s, "E14");
         } else {
             put_packet(s, "OK");
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index 6366646..f71ec2d 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -70,6 +70,7 @@ struct TranslationBlock;
  * @reset_dump_flags: #CPUDumpFlags to use for reset logging.
  * @do_interrupt: Callback for interrupt handling.
  * @do_unassigned_access: Callback for unassigned access handling.
+ * @memory_rw_debug: Callback for GDB memory access.
  * @dump_state: Callback for dumping state.
  * @dump_statistics: Callback for dumping statistics.
  * @get_arch_id: Callback for getting architecture-dependent CPU ID.
@@ -94,6 +95,8 @@ typedef struct CPUClass {
     int reset_dump_flags;
     void (*do_interrupt)(CPUState *cpu);
     CPUUnassignedAccess do_unassigned_access;
+    int (*memory_rw_debug)(CPUState *cpu, vaddr addr,
+                           uint8_t *buf, int len, bool is_write);
     void (*dump_state)(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
                        int flags);
     void (*dump_statistics)(CPUState *cpu, FILE *f,
diff --git a/target-sparc/cpu.c b/target-sparc/cpu.c
index 12494cc..d1d0339 100644
--- a/target-sparc/cpu.c
+++ b/target-sparc/cpu.c
@@ -782,6 +782,9 @@ static void sparc_cpu_class_init(ObjectClass *oc, void *data)
 
     cc->do_interrupt = sparc_cpu_do_interrupt;
     cc->dump_state = sparc_cpu_dump_state;
+#if !defined(TARGET_SPARC64) && !defined(CONFIG_USER_ONLY)
+    cc->memory_rw_debug = sparc_cpu_memory_rw_debug;
+#endif
     cc->set_pc = sparc_cpu_set_pc;
     cc->synchronize_from_tb = sparc_cpu_synchronize_from_tb;
 #ifndef CONFIG_USER_ONLY
diff --git a/target-sparc/cpu.h b/target-sparc/cpu.h
index 0f35a22..41194ec 100644
--- a/target-sparc/cpu.h
+++ b/target-sparc/cpu.h
@@ -526,9 +526,8 @@ target_ulong mmu_probe(CPUSPARCState *env, target_ulong address, int mmulev);
 void dump_mmu(FILE *f, fprintf_function cpu_fprintf, CPUSPARCState *env);
 
 #if !defined(TARGET_SPARC64) && !defined(CONFIG_USER_ONLY)
-int target_memory_rw_debug(CPUSPARCState *env, target_ulong addr,
-                           uint8_t *buf, int len, int is_write);
-#define TARGET_CPU_MEMORY_RW_DEBUG
+int sparc_cpu_memory_rw_debug(CPUState *cpu, vaddr addr,
+                              uint8_t *buf, int len, bool is_write);
 #endif
 
 
diff --git a/target-sparc/mmu_helper.c b/target-sparc/mmu_helper.c
index 45d08e4..ef12a0a 100644
--- a/target-sparc/mmu_helper.c
+++ b/target-sparc/mmu_helper.c
@@ -353,10 +353,12 @@ void dump_mmu(FILE *f, fprintf_function cpu_fprintf, CPUSPARCState *env)
  * reads (and only reads) in stack frames as if windows were flushed. We assume
  * that the sparc ABI is followed.
  */
-int target_memory_rw_debug(CPUSPARCState *env, target_ulong addr,
-                           uint8_t *buf, int len, int is_write)
+int sparc_cpu_memory_rw_debug(CPUState *cs, vaddr address,
+                              uint8_t *buf, int len, bool is_write)
 {
-    CPUState *cs = CPU(sparc_env_get_cpu(env));
+    SPARCCPU *cpu = SPARC_CPU(cs);
+    CPUSPARCState *env = &cpu->env;
+    target_ulong addr = address;
     int i;
     int len1;
     int cwp = env->cwp;
