diff --git a/sim/v850/interp.c b/sim/v850/interp.c
index d0fd132f8c89..42370c21f2a1 100644
--- a/sim/v850/interp.c
+++ b/sim/v850/interp.c
@@ -50,6 +50,8 @@ const char *interrupt_names[] =
 static void
 do_interrupt (SIM_DESC sd, void *data)
 {
+  sim_cpu *cpu = STATE_CPU (sd, 0);
+  struct v850_sim_cpu *v850_cpu = V850_SIM_CPU (cpu);
   const char **interrupt_name = (const char**)data;
   enum interrupt_type inttype;
   inttype = (interrupt_name - STATE_WATCHPOINTS (sd)->interrupt_names);
@@ -74,9 +76,9 @@ do_interrupt (SIM_DESC sd, void *data)
 	     ignores subsequent NMIs, so we don't need to count them.
 	     Just keep re-scheduling a single NMI until it manages to
 	     be delivered */
-	  if (STATE_CPU (sd, 0)->pending_nmi != NULL)
-	    sim_events_deschedule (sd, STATE_CPU (sd, 0)->pending_nmi);
-	  STATE_CPU (sd, 0)->pending_nmi =
+	  if (v850_cpu->pending_nmi != NULL)
+	    sim_events_deschedule (sd, v850_cpu->pending_nmi);
+	  v850_cpu->pending_nmi =
 	    sim_events_schedule (sd, 1, do_interrupt, data);
 	  return;
 	}
@@ -204,7 +206,8 @@ sim_open (SIM_OPEN_KIND    kind,
   cb->syscall_map = cb_v850_syscall_map;
 
   /* The cpu data is kept in a separately allocated chunk of memory.  */
-  if (sim_cpu_alloc_all (sd, 1) != SIM_RC_OK)
+  if (sim_cpu_alloc_all_extra (sd, 1, sizeof (struct v850_sim_cpu))
+      != SIM_RC_OK)
     return 0;
 
   /* for compatibility */
@@ -281,8 +284,8 @@ sim_open (SIM_OPEN_KIND    kind,
     case bfd_mach_v850e2:
     case bfd_mach_v850e2v3:
     case bfd_mach_v850e3v5:
-      STATE_CPU (sd, 0)->psw_mask = (PSW_NP | PSW_EP | PSW_ID | PSW_SAT
-				     | PSW_CY | PSW_OV | PSW_S | PSW_Z);
+      V850_SIM_CPU (STATE_CPU (sd, 0))->psw_mask =
+	(PSW_NP | PSW_EP | PSW_ID | PSW_SAT | PSW_CY | PSW_OV | PSW_S | PSW_Z);
       break;
     }
 
diff --git a/sim/v850/sim-main.h b/sim/v850/sim-main.h
index 49b845dfe7ae..ddbb7953b0d7 100644
--- a/sim/v850/sim-main.h
+++ b/sim/v850/sim-main.h
@@ -1,6 +1,8 @@
 #ifndef SIM_MAIN_H
 #define SIM_MAIN_H
 
+#define SIM_HAVE_COMMON_SIM_CPU
+
 /* The v850 has 32bit words, numbered 31 (MSB) to 0 (LSB) */
 
 #define WITH_TARGET_WORD_MSB 31
@@ -32,16 +34,14 @@ typedef struct _v850_regs {
   reg64_t vregs[32];		/* vector registers.  */
 } v850_regs;
 
-struct _sim_cpu
-{
-  /* ... simulator specific members ... */
+struct v850_sim_cpu {
   v850_regs reg;
   reg_t psw_mask;               /* only allow non-reserved bits to be set */
   sim_event *pending_nmi;
-  /* ... base type ... */
-  sim_cpu_base base;
 };
 
+#define V850_SIM_CPU(cpu) ((struct v850_sim_cpu *) CPU_ARCH_DATA (cpu))
+
 /* For compatibility, until all functions converted to passing
    SIM_DESC as an argument */
 extern SIM_DESC simulator;
@@ -90,15 +90,15 @@ nia = PC
 
 
 /* new */
-#define GR  ((CPU)->reg.regs)
-#define SR  ((CPU)->reg.sregs)
-#define VR  ((CPU)->reg.vregs)
-#define MPU0_SR  ((STATE_CPU (sd, 0))->reg.mpu0_sregs)
-#define MPU1_SR  ((STATE_CPU (sd, 0))->reg.mpu1_sregs)
-#define FPU_SR   ((STATE_CPU (sd, 0))->reg.fpu_sregs)
+#define GR  (V850_SIM_CPU (CPU)->reg.regs)
+#define SR  (V850_SIM_CPU (CPU)->reg.sregs)
+#define VR  (V850_SIM_CPU (CPU)->reg.vregs)
+#define MPU0_SR  (V850_SIM_CPU (STATE_CPU (sd, 0))->reg.mpu0_sregs)
+#define MPU1_SR  (V850_SIM_CPU (STATE_CPU (sd, 0))->reg.mpu1_sregs)
+#define FPU_SR   (V850_SIM_CPU (STATE_CPU (sd, 0))->reg.fpu_sregs)
 
 /* old */
-#define State    (STATE_CPU (simulator, 0)->reg)
+#define State    (V850_SIM_CPU (STATE_CPU (simulator, 0))->reg)
 #define PC	(State.pc)
 #define SP_REGNO        3
 #define SP      (State.regs[SP_REGNO])
diff --git a/sim/v850/v850.igen b/sim/v850/v850.igen
index eb32c0f5ec33..6bfabc08ea0a 100644
--- a/sim/v850/v850.igen
+++ b/sim/v850/v850.igen
@@ -370,7 +370,7 @@ rrrrr,111111,RRRRR + 0000000011100100:IX:::clr1
 "ctret"
 {
   nia  = (CTPC & ~1);
-  PSW = (CTPSW & (CPU)->psw_mask);
+  PSW = (CTPSW & V850_SIM_CPU (CPU)->psw_mask);
   TRACE_BRANCH1 (PSW);
 }
 
@@ -954,7 +954,7 @@ regID,111111,RRRRR + selID,00000100000:IX:::ldsr
   /* FIXME: For now we ignore the selID.  */
   if (idecode_issue == idecode_v850e3v5_issue && selID != 0)
     {
-      (CPU)->reg.selID_sregs[selID][regID] = sreg;
+      V850_SIM_CPU (CPU)->reg.selID_sregs[selID][regID] = sreg;
     }
   else if ((   idecode_issue == idecode_v850e2_issue
             || idecode_issue == idecode_v850e3v5_issue
