diff --git a/sim/h8300/state.h b/sim/h8300/state.h
new file mode 100644
index 00000000000..dd89d0b3576
--- /dev/null
+++ b/sim/h8300/state.h
@@ -0,0 +1,68 @@
+
+#define SET_WORD_MEM(x,y)  {saved_state.mem[(x)>>1] = y;}
+#define SET_BYTE_MEM(x,y)  {BYTE_MEM(x)=y;}
+
+#define WORD_MEM(x)  (saved_state.mem[(x)>>1])
+#define BYTE_MEM(x)  (*(((char *)(saved_state.mem))+((x)^HOST_IS_LITTLE_ENDIAN)))
+
+#define CCR 	8
+#define PC 	9
+#define CYCLES 	10
+#define HCHECK 	11
+#define TIER 	12
+#define TCSR 	13
+#define FRC 	14
+#define OCRA 	15
+#define OCRB 	16
+#define TCR 	17
+#define TOCR 	18
+#define ICRA 	19
+#define NREG 20
+struct state
+{
+  unsigned short int reg[NREG];
+  unsigned char *(bregp[16]);
+  unsigned char *(bregp_NNNNxxxx[256]);
+  unsigned char *(bregp_xxxxNNNN[256]);
+  unsigned short int *(wregp_xNNNxxxx[256]);
+  unsigned short int *(wregp_xxxxxNNN[256]);
+  int exception;
+  int ienable;
+  unsigned short *mem;
+}
+
+saved_state;
+
+
+
+#define OCFA (1<<3)
+#define OCFB (1<<2)
+#define CCLRA (1<<0)
+/* TCR bits */
+#define OCIEA (1<<3)
+#define OCIEB (1<<2)
+#define OVIE (1<<1)
+#define OVF  (1<<1)
+
+/* TOCR bits */
+#define OCRS (1<<4)
+
+
+#ifdef __GO32__
+#define HOST_IS_LITTLE_ENDIAN 1
+#else
+#define HOST_IS_LITTLE_ENDIAN 0
+#endif
+
+#define SAVE_INTERPRETER_STATE() \
+saved_state.reg[CYCLES] = cycles; \
+saved_state.reg[PC] = (pc - saved_state.mem) <<1; \
+saved_state.reg[CCR] = GET_CCR();  \
+store_timer_state_to_mem(); 
+
+#define LOAD_INTERPRETER_STATE() \
+  SET_CCR (saved_state.reg[CCR]); \
+  checkfreq = saved_state.reg[HCHECK]; \
+  pc = (saved_state.reg[PC]>>1) + saved_state.mem; \
+  load_timer_state_from_mem(); \
+  cycles=saved_state.reg[CYCLES];