2003-06-03 Michael Snyder <msnyder@redhat.com>

	* h8300/compile.c: Add h8300sx insns and addressing modes.
	* h8300/sim-main.h: Replaces h8300/inst.h.
	* h8300/Makefile.in: Tweak to bring in some sim/common stuff.

4 files changed, 3400 insertions, 1022 deletions

diff --git a/sim/h8300/ChangeLog b/sim/h8300/ChangeLog
index 600e9cc..34577d8 100644
--- a/sim/h8300/ChangeLog
+++ b/sim/h8300/ChangeLog
@@ -1,3 +1,9 @@
+2003-06-03  Michael Snyder  <msnyder@redhat.com>
+
+	* h8300/compile.c: Add h8300sx insns and addressing modes.
+	* h8300/sim-main.h: Replaces h8300/inst.h.
+	* h8300/Makefile.in: Tweak to bring in some sim/common stuff.
+
 2003-04-13  Michael Snyder  <msnyder@redhat.com>
 
 	* compile.c (sim_resume): Implement 'daa' and 'das' instructions.
diff --git a/sim/h8300/Makefile.in b/sim/h8300/Makefile.in
index 55dc3db..1d1f9d3 100644
--- a/sim/h8300/Makefile.in
+++ b/sim/h8300/Makefile.in
@@ -18,10 +18,20 @@
 
 ## COMMON_PRE_CONFIG_FRAG
 
-SIM_OBJS = compile.o sim-load.o
+# List of main object files for `run'.
+SIM_RUN_OBJS = nrun.o
+
+SIM_OBJS = compile.o \
+	   $(SIM_NEW_COMMON_OBJS) \
+	   sim-cpu.o \
+	   sim-engine.o \
+	   sim-load.o \
+	   $(SIM_EXTRA_OBJS)
+
 ## COMMON_POST_CONFIG_FRAG
 
 compile.o: compile.c inst.h config.h \
-	    $(srcdir)/../../include/gdb/sim-h8300.h \
-	    $(srcdir)/../../include/gdb/remote-sim.h \
-	    $(srcdir)/../../include/gdb/callback.h
+	   $(srcdir)/../../include/gdb/sim-h8300.h \
+	   $(srcdir)/../../include/opcode/h8300.h \
+	   $(srcdir)/../../include/gdb/remote-sim.h \
+	   $(srcdir)/../../include/gdb/callback.h
diff --git a/sim/h8300/compile.c b/sim/h8300/compile.c
index 0e4b6d2..a21cd65 100644
--- a/sim/h8300/compile.c
+++ b/sim/h8300/compile.c
@@ -17,9 +17,6 @@
  * AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
-#include "config.h"
-
-#include <stdio.h>
 #include <signal.h>
 #ifdef HAVE_TIME_H
 #include <time.h>
@@ -30,10 +27,9 @@
 #ifdef HAVE_SYS_PARAM_H
 #include <sys/param.h>
 #endif
-#include "ansidecl.h"
+
 #include "bfd.h"
-#include "gdb/callback.h"
-#include "gdb/remote-sim.h"
+#include "sim-main.h"
 #include "gdb/sim-h8300.h"
 #include "sys/stat.h"
 #include "sys/types.h"
@@ -53,61 +49,440 @@ static char *myname;
    This header should also include the things in remote-sim.h.
    One could move this to remote-sim.h but this function isn't needed
    by gdb.  */
-void sim_set_simcache_size PARAMS ((int));
+static void set_simcache_size (SIM_DESC, int);
 
-#define X(op, size)  op * 4 + size
+#define X(op, size)  (op * 4 + size)
 
 #define SP (h8300hmode ? SL : SW)
-#define SB 0
-#define SW 1
-#define SL 2
-#define OP_REG 1
-#define OP_DEC 2
-#define OP_DISP 3
-#define OP_INC 4
-#define OP_PCREL 5
-#define OP_MEM 6
-#define OP_CCR 7
-#define OP_IMM 8
-#define OP_ABS 10
-#define OP_EXR 11
+
 #define h8_opcodes ops
 #define DEFINE_TABLE
 #include "opcode/h8300.h"
 
-#include "inst.h"
+/* CPU data object: */
+
+static int
+sim_state_initialize (SIM_DESC sd, sim_cpu *cpu)
+{
+  /* FIXME: not really necessary, since sim_cpu_alloc calls zalloc.  */
+
+  memset (&cpu->regs, 0, sizeof(cpu->regs));
+  cpu->regs[SBR_REGNUM] = 0xFFFFFF00;
+  cpu->pc = 0;
+  cpu->delayed_branch = 0;
+  cpu->memory = NULL;
+  cpu->eightbit = NULL;
+  cpu->mask = 0;
+
+  /* Initialize local simulator state.  */
+  sd->sim_cache = NULL;
+  sd->sim_cache_size = 0;
+  sd->cache_idx = NULL;
+  sd->cache_top = 0;
+  sd->memory_size = 0;
+  sd->compiles = 0;
+#ifdef ADEBUG
+  memset (&cpu->stats, 0, sizeof (cpu->stats));
+#endif
+  return 0;
+}
+
+static unsigned int
+h8_get_pc (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> pc;
+}
+
+static void
+h8_set_pc (SIM_DESC sd, unsigned int val)
+{
+  (STATE_CPU (sd, 0)) -> pc = val;
+}
+
+static unsigned int
+h8_get_ccr (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> regs[CCR_REGNUM];
+}
+
+static void
+h8_set_ccr (SIM_DESC sd, unsigned int val)
+{
+  (STATE_CPU (sd, 0)) -> regs[CCR_REGNUM] = val;
+}
+
+static unsigned int
+h8_get_exr (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> regs[EXR_REGNUM];
+}
+
+static void
+h8_set_exr (SIM_DESC sd, unsigned int val)
+{
+  (STATE_CPU (sd, 0)) -> regs[EXR_REGNUM] = val;
+}
+
+static int
+h8_get_sbr (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> regs[SBR_REGNUM];
+}
+
+static void
+h8_set_sbr (SIM_DESC sd, int val)
+{
+  (STATE_CPU (sd, 0)) -> regs[SBR_REGNUM] = val;
+}
+
+static int
+h8_get_vbr (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> regs[VBR_REGNUM];
+}
+
+static void
+h8_set_vbr (SIM_DESC sd, int val)
+{
+  (STATE_CPU (sd, 0)) -> regs[VBR_REGNUM] = val;
+}
+
+static int
+h8_get_cache_top (SIM_DESC sd)
+{
+  return sd -> cache_top;
+}
+
+static void
+h8_set_cache_top (SIM_DESC sd, int val)
+{
+  sd -> cache_top = val;
+}
+
+static int
+h8_get_mask (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> mask;
+}
+
+static void
+h8_set_mask (SIM_DESC sd, int val)
+{
+  (STATE_CPU (sd, 0)) -> mask = val;
+}
+#if 0
+static int
+h8_get_exception (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> exception;
+}
+
+static void
+h8_set_exception (SIM_DESC sd, int val)
+{
+  (STATE_CPU (sd, 0)) -> exception = val;
+}
+
+static enum h8300_sim_state
+h8_get_state (SIM_DESC sd)
+{
+  return sd -> state;
+}
+
+static void
+h8_set_state (SIM_DESC sd, enum h8300_sim_state val)
+{
+  sd -> state = val;
+}
+#endif
+static unsigned int
+h8_get_cycles (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> regs[CYCLE_REGNUM];
+}
+
+static void
+h8_set_cycles (SIM_DESC sd, unsigned int val)
+{
+  (STATE_CPU (sd, 0)) -> regs[CYCLE_REGNUM] = val;
+}
+
+static unsigned int
+h8_get_insts (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> regs[INST_REGNUM];
+}
+
+static void
+h8_set_insts (SIM_DESC sd, unsigned int val)
+{
+  (STATE_CPU (sd, 0)) -> regs[INST_REGNUM] = val;
+}
+
+static unsigned int
+h8_get_ticks (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> regs[TICK_REGNUM];
+}
+
+static void
+h8_set_ticks (SIM_DESC sd, unsigned int val)
+{
+  (STATE_CPU (sd, 0)) -> regs[TICK_REGNUM] = val;
+}
+
+static unsigned int
+h8_get_mach (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> regs[MACH_REGNUM];
+}
+
+static void
+h8_set_mach (SIM_DESC sd, unsigned int val)
+{
+  (STATE_CPU (sd, 0)) -> regs[MACH_REGNUM] = val;
+}
+
+static unsigned int
+h8_get_macl (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> regs[MACL_REGNUM];
+}
+
+static void
+h8_set_macl (SIM_DESC sd, unsigned int val)
+{
+  (STATE_CPU (sd, 0)) -> regs[MACL_REGNUM] = val;
+}
+
+static int
+h8_get_compiles (SIM_DESC sd)
+{
+  return sd -> compiles;
+}
+
+static void
+h8_increment_compiles (SIM_DESC sd)
+{
+  sd -> compiles ++;
+}
+
+static unsigned int *
+h8_get_reg_buf (SIM_DESC sd)
+{
+  return &(((STATE_CPU (sd, 0)) -> regs)[0]);
+}
+
+static unsigned int
+h8_get_reg (SIM_DESC sd, int regnum)
+{
+  return (STATE_CPU (sd, 0)) -> regs[regnum];
+}
+
+static void
+h8_set_reg (SIM_DESC sd, int regnum, int val)
+{
+  (STATE_CPU (sd, 0)) -> regs[regnum] = val;
+}
+
+#ifdef ADEBUG
+static int
+h8_get_stats (SIM_DESC sd, int idx)
+{
+  return sd -> stats[idx];
+}
+
+static void
+h8_increment_stats (SIM_DESC sd, int idx)
+{
+  sd -> stats[idx] ++;
+}
+#endif /* ADEBUG */
+
+static unsigned short *
+h8_get_cache_idx_buf (SIM_DESC sd)
+{
+  return sd -> cache_idx;
+}
+
+static void
+h8_set_cache_idx_buf (SIM_DESC sd, unsigned short *ptr)
+{
+  sd -> cache_idx = ptr;
+}
+
+static unsigned short
+h8_get_cache_idx (SIM_DESC sd, unsigned int idx)
+{
+  if (idx > sd->memory_size)
+    return (unsigned short) -1;
+  return sd -> cache_idx[idx];
+}
+
+static void
+h8_set_cache_idx (SIM_DESC sd, int idx, unsigned int val)
+{
+  sd -> cache_idx[idx] = (unsigned short) val;
+}
+
+static unsigned char *
+h8_get_memory_buf (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> memory;
+}
+
+static void
+h8_set_memory_buf (SIM_DESC sd, unsigned char *ptr)
+{
+  (STATE_CPU (sd, 0)) -> memory = ptr;
+}
+
+static unsigned char
+h8_get_memory (SIM_DESC sd, int idx)
+{
+  return (STATE_CPU (sd, 0)) -> memory[idx];
+}
+
+static void
+h8_set_memory (SIM_DESC sd, int idx, unsigned int val)
+{
+  (STATE_CPU (sd, 0)) -> memory[idx] = (unsigned char) val;
+}
+
+static unsigned char *
+h8_get_eightbit_buf (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> eightbit;
+}
+
+static void
+h8_set_eightbit_buf (SIM_DESC sd, unsigned char *ptr)
+{
+  (STATE_CPU (sd, 0)) -> eightbit = ptr;
+}
+
+static unsigned char
+h8_get_eightbit (SIM_DESC sd, int idx)
+{
+  return (STATE_CPU (sd, 0)) -> eightbit[idx];
+}
+
+static void
+h8_set_eightbit (SIM_DESC sd, int idx, unsigned int val)
+{
+  (STATE_CPU (sd, 0)) -> eightbit[idx] = (unsigned char) val;
+}
+
+static unsigned int
+h8_get_delayed_branch (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> delayed_branch;
+}
+
+static void
+h8_set_delayed_branch (SIM_DESC sd, unsigned int dest)
+{
+  (STATE_CPU (sd, 0)) -> delayed_branch = dest;
+}
+
+static char **
+h8_get_command_line (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> command_line;
+}
+
+static void
+h8_set_command_line (SIM_DESC sd, char ** val)
+{
+  (STATE_CPU (sd, 0)) -> command_line = val;
+}
+
+static char *
+h8_get_cmdline_arg (SIM_DESC sd, int index)
+{
+  return (STATE_CPU (sd, 0)) -> command_line[index];
+}
+
+static void
+h8_set_cmdline_arg (SIM_DESC sd, int index, char * val)
+{
+  (STATE_CPU (sd, 0)) -> command_line[index] = val;
+}
+
+/* MAC Saturation Mode */
+static int
+h8_get_macS (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> macS;
+}
+
+static void
+h8_set_macS (SIM_DESC sd, int val)
+{
+  (STATE_CPU (sd, 0)) -> macS = (val != 0);
+}
+
+/* MAC Zero Flag */
+static int
+h8_get_macZ (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> macZ;
+}
+
+static void
+h8_set_macZ (SIM_DESC sd, int val)
+{
+  (STATE_CPU (sd, 0)) -> macZ = (val != 0);
+}
+
+/* MAC Negative Flag */
+static int
+h8_get_macN (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> macN;
+}
+
+static void
+h8_set_macN (SIM_DESC sd, int val)
+{
+  (STATE_CPU (sd, 0)) -> macN = (val != 0);
+}
+
+/* MAC Overflow Flag */
+static int
+h8_get_macV (SIM_DESC sd)
+{
+  return (STATE_CPU (sd, 0)) -> macV;
+}
+
+static void
+h8_set_macV (SIM_DESC sd, int val)
+{
+  (STATE_CPU (sd, 0)) -> macV = (val != 0);
+}
+
+/* End CPU data object.  */
 
 /* The rate at which to call the host's poll_quit callback.  */
 
-#define POLL_QUIT_INTERVAL 0x80000
+enum { POLL_QUIT_INTERVAL = 0x80000 };
 
 #define LOW_BYTE(x) ((x) & 0xff)
 #define HIGH_BYTE(x) (((x) >> 8) & 0xff)
-#define P(X,Y) ((X << 8) | Y)
-
-#define BUILDSR()					\
-  cpu.ccr = ((I << 7) | (UI << 6) | (H << 5) | (U << 4)	\
-	     | (N << 3) | (Z << 2) | (V << 1) | C);
-
-#define BUILDEXR()	    \
-  if (h8300smode) cpu.exr = (trace<<7) | intMask;
-
-#define GETSR()		    \
-  c = (cpu.ccr >> 0) & 1;\
-  v = (cpu.ccr >> 1) & 1;\
-  nz = !((cpu.ccr >> 2) & 1);\
-  n = (cpu.ccr >> 3) & 1;\
-  u = (cpu.ccr >> 4) & 1;\
-  h = (cpu.ccr >> 5) & 1;\
-  ui = ((cpu.ccr >> 6) & 1);\
-  intMaskBit = (cpu.ccr >> 7) & 1;
-
-#define GETEXR()				\
-  if (h8300smode)				\
-    {						\
-      trace = (cpu.exr >> 7) & 1;		\
-      intMask = cpu.exr & 7;			\
-    }
+#define P(X, Y) ((X << 8) | Y)
+
+#define C (c != 0)
+#define Z (nz == 0)
+#define V (v != 0)
+#define N (n != 0)
+#define U (u != 0)
+#define H (h != 0)
+#define UI (ui != 0)
+#define I (intMaskBit != 0)
+
+#define BUILDSR(SD)						\
+  h8_set_ccr (SD, (I << 7) | (UI << 6) | (H << 5) | (U << 4)	\
+	     | (N << 3) | (Z << 2) | (V << 1) | C)
 
 #ifdef __CHAR_IS_SIGNED__
 #define SEXTCHAR(x) ((char) (x))
@@ -121,17 +496,16 @@ void sim_set_simcache_size PARAMS ((int));
 #define UEXTSHORT(x) ((x) & 0xffff)
 #define SEXTSHORT(x) ((short) (x))
 
-static cpu_state_type cpu;
-
-int h8300hmode = 0;
-int h8300smode = 0;
+int h8300hmode  = 0;
+int h8300smode  = 0;
+int h8300sxmode = 0;
 
 static int memory_size;
 
 static int
 get_now (void)
 {
-  return time (0);	/* WinXX HAS UNIX like 'time', so why not using it? */
+  return time (0);	/* WinXX HAS UNIX like 'time', so why not use it? */
 }
 
 static int
@@ -148,32 +522,42 @@ bitfrom (int x)
     case L_8:
       return SB;
     case L_16:
+    case L_16U:
       return SW;
     case L_32:
       return SL;
     case L_P:
       return h8300hmode ? SL : SW;
     }
+  return 0;
 }
 
+/* Simulate an indirection / dereference.  
+   return 0 for success, -1 for failure.
+*/
+
 static unsigned int
-lvalue (int x, int rn)
+lvalue (SIM_DESC sd, int x, int rn, unsigned int *val)
 {
+  if (val == NULL)	/* Paranoia.  */
+    return -1;
+
   switch (x / 4)
     {
     case OP_DISP:
-      if (rn == 8)
-	{
-	  return X (OP_IMM, SP);
-	}
-      return X (OP_REG, SP);
-
+      if (rn == ZERO_REGNUM)
+	*val = X (OP_IMM, SP);
+      else
+	*val = X (OP_REG, SP);
+      break;
     case OP_MEM:
-      return X (OP_MEM, SP);
-
+      *val = X (OP_MEM, SP);
+      break;
     default:
-      abort (); /* ?? May be something more usefull? */
+      sim_engine_set_run_state (sd, sim_stopped, SIGSEGV);
+      return -1;
     }
+  return 0;
 }
 
 static int
@@ -187,17 +571,14 @@ cmdline_location()
     return 0xff00L;
 }
 
-static unsigned int
-decode (int addr, unsigned char *data, decoded_inst *dst)
+static void
+decode (SIM_DESC sd, int addr, unsigned char *data, decoded_inst *dst)
 {
-  int rs = 0;
-  int rd = 0;
-  int rdisp = 0;
-  int abs = 0;
-  int bit = 0;
-  int plen = 0;
-  struct h8_opcode *q;
-  int size = 0;
+  int cst[3]   = {0, 0, 0};
+  int reg[3]   = {0, 0, 0};
+  int rdisp[3] = {0, 0, 0};
+  int opnum;
+  const struct h8_opcode *q;
 
   dst->dst.type = -1;
   dst->src.type = -1;
@@ -208,12 +589,18 @@ decode (int addr, unsigned char *data, decoded_inst *dst)
       op_type *nib = q->data.nib;
       unsigned int len = 0;
 
+      if ((q->available == AV_H8SX && !h8300sxmode) ||
+	  (q->available == AV_H8H  && !h8300hmode))
+	continue;
+
       while (1)
 	{
 	  op_type looking_for = *nib;
-	  int thisnib = data[len >> 1];
+	  int thisnib = data[len / 2];
 
 	  thisnib = (len & 1) ? (thisnib & 0xf) : ((thisnib >> 4) & 0xf);
+	  opnum = ((looking_for & OP3) ? 2 :
+		   (looking_for & DST) ? 1 : 0);
 
 	  if (looking_for < 16 && looking_for >= 0)
 	    {
@@ -222,24 +609,81 @@ decode (int addr, unsigned char *data, decoded_inst *dst)
 	    }
 	  else
 	    {
-	      if ((int) looking_for & (int) B31)
+	      if (looking_for & B31)
 		{
-		  if (!(((int) thisnib & 0x8) != 0))
+		  if (!((thisnib & 0x8) != 0))
 		    goto fail;
 
-		  looking_for = (op_type) ((int) looking_for & ~(int) B31);
+		  looking_for = (op_type) (looking_for & ~B31);
 		  thisnib &= 0x7;
 		}
+	      else if (looking_for & B30)
+		{
+		  if (!((thisnib & 0x8) == 0))
+		    goto fail;
+
+		  looking_for = (op_type) (looking_for & ~B30);
+		}
+
+	      if (looking_for & B21)
+		{
+		  if (!((thisnib & 0x4) != 0))
+		    goto fail;
+
+		  looking_for = (op_type) (looking_for & ~B21);
+		  thisnib &= 0xb;
+		}
+	      else if (looking_for & B20)
+		{
+		  if (!((thisnib & 0x4) == 0))
+		    goto fail;
+
+		  looking_for = (op_type) (looking_for & ~B20);
+		}
+
+	      if (looking_for & B11)
+		{
+		  if (!((thisnib & 0x2) != 0))
+		    goto fail;
+
+		  looking_for = (op_type) (looking_for & ~B11);
+		  thisnib &= 0xd;
+		}
+	      else if (looking_for & B10)
+		{
+		  if (!((thisnib & 0x2) == 0))
+		    goto fail;
+
+		  looking_for = (op_type) (looking_for & ~B10);
+		}
 
-	      if ((int) looking_for & (int) B30)
+	      if (looking_for & B01)
 		{
-		  if (!(((int) thisnib & 0x8) == 0))
+		  if (!((thisnib & 0x1) != 0))
 		    goto fail;
 
-		  looking_for = (op_type) ((int) looking_for & ~(int) B30);
+		  looking_for = (op_type) (looking_for & ~B01);
+		  thisnib &= 0xe;
 		}
+	      else if (looking_for & B00)
+		{
+		  if (!((thisnib & 0x1) == 0))
+		    goto fail;
 
-	      if (looking_for & DBIT)
+		  looking_for = (op_type) (looking_for & ~B00);
+		}
+
+	      if (looking_for & IGNORE)
+		{
+		  /* Hitachi has declared that IGNORE must be zero.  */
+		  if (thisnib != 0)
+		    goto fail;
+		}
+	      else if ((looking_for & MODE) == DATA)
+		{
+		  ;			/* Skip embedded data.  */
+		}
+	      else if ((looking_for & MODE) == DBIT)
 		{
 		  /* Exclude adds/subs by looking at bit 0 and 2, and
                      make sure the operand size, either w or l,
@@ -247,223 +691,438 @@ decode (int addr, unsigned char *data, decoded_inst *dst)
 		  if ((looking_for & 7) != (thisnib & 7))
 		    goto fail;
 
-		  abs = (thisnib & 0x8) ? 2 : 1;
+		  cst[opnum] = (thisnib & 0x8) ? 2 : 1;
 		}
-	      else if (looking_for & (REG | IND | INC | DEC))
+	      else if ((looking_for & MODE) == REG     ||
+		       (looking_for & MODE) == LOWREG  ||
+		       (looking_for & MODE) == IND     ||
+		       (looking_for & MODE) == PREINC  ||
+		       (looking_for & MODE) == POSTINC ||
+		       (looking_for & MODE) == PREDEC  ||
+		       (looking_for & MODE) == POSTDEC)
 		{
-		  if (looking_for & REG)
+		  reg[opnum] = thisnib;
+		}
+	      else if (looking_for & CTRL)
+		{
+		  thisnib &= 7;
+		  if (((looking_for & MODE) == CCR  && (thisnib != C_CCR))  ||
+		      ((looking_for & MODE) == EXR  && (thisnib != C_EXR))  ||
+		      ((looking_for & MODE) == MACH && (thisnib != C_MACH)) ||
+		      ((looking_for & MODE) == MACL && (thisnib != C_MACL)) ||
+		      ((looking_for & MODE) == VBR  && (thisnib != C_VBR))  ||
+		      ((looking_for & MODE) == SBR  && (thisnib != C_SBR)))
+		    goto fail;
+		  if (((looking_for & MODE) == CCR_EXR && 
+		       (thisnib != C_CCR && thisnib != C_EXR)) ||
+		      ((looking_for & MODE) == VBR_SBR && 
+		       (thisnib != C_VBR && thisnib != C_SBR)) ||
+		      ((looking_for & MODE) == MACREG && 
+		       (thisnib != C_MACH && thisnib != C_MACL)))
+		    goto fail;
+		  if (((looking_for & MODE) == CC_EX_VB_SB && 
+		       (thisnib != C_CCR && thisnib != C_EXR &&
+			thisnib != C_VBR && thisnib != C_SBR)))
+		    goto fail;
+
+		  reg[opnum] = thisnib;
+		}
+	      else if ((looking_for & MODE) == ABS)
+		{
+		  /* Absolute addresses are unsigned.  */
+		  switch (looking_for & SIZE)
 		    {
-		      /* Can work out size from the register.  */
-		      size = bitfrom (looking_for);
+		    case L_8:
+		      cst[opnum] = UEXTCHAR (data[len / 2]);
+		      break;
+		    case L_16:
+		    case L_16U:
+		      cst[opnum] = (data[len / 2] << 8) + data[len / 2 + 1];
+		      break;
+		    case L_32:
+		      cst[opnum] = 
+			(data[len / 2 + 0] << 24) + 
+			(data[len / 2 + 1] << 16) +
+			(data[len / 2 + 2] <<  8) +  
+			(data[len / 2 + 3]);
+		      break;
+		    default:
+		      printf ("decode: bad size ABS: %d\n", 
+			      (looking_for & SIZE));
+		      goto end;
 		    }
-		  if (looking_for & SRC)
-		    rs = thisnib;
-		  else
-		    rd = thisnib;
 		}
-	      else if (looking_for & L_16)
+	      else if ((looking_for & MODE) == DISP   ||
+		       (looking_for & MODE) == PCREL  ||
+		       (looking_for & MODE) == INDEXB ||
+		       (looking_for & MODE) == INDEXW ||
+		       (looking_for & MODE) == INDEXL)
+
 		{
-		  abs = (data[len >> 1]) * 256 + data[(len + 2) >> 1];
-		  plen = 16;
-		  if (looking_for & (PCREL | DISP))
+		  switch (looking_for & SIZE)
 		    {
-		      abs = (short) (abs);
+		    case L_2:
+		      cst[opnum] = thisnib & 3;
+
+		      /* DISP2 special treatment.  */
+		      if ((looking_for & MODE) == DISP)
+			{
+			  switch (OP_SIZE (q->how)) {
+			  default: break;
+			  case SW:
+			    cst[opnum] *= 2;
+			    break;
+			  case SL:
+			    cst[opnum] *= 4;
+			    break;
+			  }
+			}
+		      break;
+		    case L_8:
+		      cst[opnum] = SEXTCHAR (data[len / 2]);
+		      break;
+		    case L_16:
+		      cst[opnum] = (data[len / 2] << 8) + data[len / 2 + 1];
+		      cst[opnum] = (short) cst[opnum];	/* Sign extend.  */
+		      break;
+		    case L_16U:
+		      cst[opnum] = (data[len / 2] << 8) + data[len / 2 + 1];
+		      break;
+		    case L_32:
+		      cst[opnum] = 
+			(data[len / 2 + 0] << 24) + 
+			(data[len / 2 + 1] << 16) +
+			(data[len / 2 + 2] <<  8) +  
+			(data[len / 2 + 3]);
+		      break;
+		    default:
+		      printf ("decode: bad size DISP/PCREL/INDEX: %d\n", 
+			      (looking_for & SIZE));
+		      goto end;
 		    }
 		}
-	      else if (looking_for & ABSJMP)
+	      else if ((looking_for & SIZE) == L_16 ||
+		       (looking_for & SIZE) == L_16U)
 		{
-		  abs = (data[1] << 16) | (data[2] << 8) | (data[3]);
+		  cst[opnum] = (data[len / 2] << 8) + data[len / 2 + 1];
+		  if ((looking_for & SIZE) != L_16U)
+		    cst[opnum] = (short) cst[opnum];	/* Sign extend.  */
 		}
-	      else if (looking_for & MEMIND)
+	      else if (looking_for & ABSJMP)
 		{
-		  abs = data[1];
+		  switch (looking_for & SIZE) {
+		  case L_24:
+		    cst[opnum] = (data[1] << 16) | (data[2] << 8) | (data[3]);
+		    break;
+		  case L_32:
+		    cst[opnum] = 
+		      (data[len / 2 + 0] << 24) + 
+		      (data[len / 2 + 1] << 16) +
+		      (data[len / 2 + 2] <<  8) +  
+		      (data[len / 2 + 3]);
+		    break;
+		  default:
+		    printf ("decode: bad size ABSJMP: %d\n", 
+			    (looking_for & SIZE));
+		      goto end;
+		  }
 		}
-	      else if (looking_for & L_32)
+	      else if ((looking_for & MODE) == MEMIND)
 		{
-		  int i = len >> 1;
-
-		  abs = (data[i] << 24)
-		    | (data[i + 1] << 16)
-		    | (data[i + 2] << 8)
-		    | (data[i + 3]);
-
-		  plen = 32;
+		  cst[opnum] = data[1];
 		}
-	      else if (looking_for & L_24)
+	      else if ((looking_for & SIZE) == L_32)
 		{
-		  int i = len >> 1;
+		  int i = len / 2;
 
-		  abs = (data[i] << 16) | (data[i + 1] << 8) | (data[i + 2]);
-		  plen = 24;
+		  cst[opnum] = 
+		    (data[i + 0] << 24) |
+		    (data[i + 1] << 16) |
+		    (data[i + 2] <<  8) |
+		    (data[i + 3]);
 		}
-	      else if (looking_for & IGNORE)
+	      else if ((looking_for & SIZE) == L_24)
 		{
-		  ;
+		  int i = len / 2;
+
+		  cst[opnum] = 
+		    (data[i + 0] << 16) | 
+		    (data[i + 1] << 8) | 
+		    (data[i + 2]);
 		}
 	      else if (looking_for & DISPREG)
 		{
-		  rdisp = thisnib & 0x7;
+		  rdisp[opnum] = thisnib & 0x7;
 		}
-	      else if (looking_for & KBIT)
+	      else if ((looking_for & MODE) == KBIT)
 		{
 		  switch (thisnib)
 		    {
 		    case 9:
-		      abs = 4;
+		      cst[opnum] = 4;
 		      break;
 		    case 8:
-		      abs = 2;
+		      cst[opnum] = 2;
 		      break;
 		    case 0:
-		      abs = 1;
+		      cst[opnum] = 1;
 		      break;
 		    default:
 		      goto fail;
 		    }
 		}
-	      else if (looking_for & L_8)
+	      else if ((looking_for & SIZE) == L_8)
 		{
-		  plen = 8;
-
-		  if (looking_for & PCREL)
+		  if ((looking_for & MODE) == ABS)
 		    {
-		      abs = SEXTCHAR (data[len >> 1]);
-		    }
-		  else if (looking_for & ABS8MEM)
-		    {
-		      plen = 8;
-		      abs = h8300hmode ? ~0xff0000ff : ~0xffff00ff;
-		      abs |= data[len >> 1] & 0xff;
+		      /* Will be combined with contents of SBR_REGNUM
+			 by fetch ().  For all modes except h8sx, this
+			 will always contain the value 0xFFFFFF00.  */
+		      cst[opnum] = data[len / 2] & 0xff;
 		    }
 		  else
 		    {
-		      abs = data[len >> 1] & 0xff;
+		      cst[opnum] = data[len / 2] & 0xff;
 		    }
 		}
-	      else if (looking_for & L_3)
+	      else if ((looking_for & SIZE) == L_3 ||
+		       (looking_for & SIZE) == L_3NZ)
 		{
-		  plen = 3;
-
-		  bit = thisnib;
+		  cst[opnum] = thisnib & 7;
+		  if (cst[opnum] == 0 && (looking_for & SIZE) == L_3NZ)
+		    goto fail;
+		}
+	      else if ((looking_for & SIZE) == L_4)
+		{
+		  cst[opnum] = thisnib & 15;
+		}
+	      else if ((looking_for & SIZE) == L_5)
+		{
+		  cst[opnum] = data[len / 2] & 0x1f;
 		}
 	      else if (looking_for == E)
 		{
+#ifdef ADEBUG
 		  dst->op = q;
-
+#endif
 		  /* Fill in the args.  */
 		  {
 		    op_type *args = q->args.nib;
 		    int hadone = 0;
+		    int nargs;
 
-		    while (*args != E)
+		    for (nargs = 0; 
+			 nargs < 3 && *args != E; 
+			 nargs++)
 		      {
 			int x = *args;
-			int rn = (x & DST) ? rd : rs;
 			ea_type *p;
 
+			opnum = ((x & OP3) ? 2 :
+				 (x & DST) ? 1 : 0);
 			if (x & DST)
-			  p = &(dst->dst);
+			  p = &dst->dst;
+			else if (x & OP3)
+			  p = &dst->op3;
 			else
-			  p = &(dst->src);
+			  p = &dst->src;
 
-			if (x & L_3)
+			if ((x & MODE) == IMM  ||
+			    (x & MODE) == KBIT ||
+			    (x & MODE) == DBIT)
 			  {
-			    p->type = X (OP_IMM, size);
-			    p->literal = bit;
+			    /* Use the instruction to determine 
+			       the operand size.  */
+			    p->type = X (OP_IMM, OP_SIZE (q->how));
+			    p->literal = cst[opnum];
 			  }
-			else if (x & (IMM | KBIT | DBIT))
+			else if ((x & MODE) == CONST_2 ||
+				 (x & MODE) == CONST_4 ||
+				 (x & MODE) == CONST_8 ||
+				 (x & MODE) == CONST_16)
 			  {
-			    p->type = X (OP_IMM, size);
-			    p->literal = abs;
+			    /* Use the instruction to determine 
+			       the operand size.  */
+			    p->type = X (OP_IMM, OP_SIZE (q->how));
+			    switch (x & MODE) {
+			    case CONST_2:	p->literal =  2; break;
+			    case CONST_4:	p->literal =  4; break;
+			    case CONST_8:	p->literal =  8; break;
+			    case CONST_16:	p->literal = 16; break;
+			    }
 			  }
-			else if (x & REG)
+			else if ((x & MODE) == REG)
 			  {
-			    /* Reset the size.
-			       Some ops (like mul) have two sizes.  */
-
-			    size = bitfrom (x);
-			    p->type = X (OP_REG, size);
-			    p->reg = rn;
+			    p->type = X (OP_REG, bitfrom (x));
+			    p->reg = reg[opnum];
 			  }
-			else if (x & INC)
+			else if ((x & MODE) == LOWREG)
 			  {
-			    p->type = X (OP_INC, size);
-			    p->reg = rn & 0x7;
+			    p->type = X (OP_LOWREG, bitfrom (x));
+			    p->reg = reg[opnum];
 			  }
-			else if (x & DEC)
+			else if ((x & MODE) == PREINC)
 			  {
-			    p->type = X (OP_DEC, size);
-			    p->reg = rn & 0x7;
+			    /* Use the instruction to determine 
+			       the operand size.  */
+			    p->type = X (OP_PREINC, OP_SIZE (q->how));
+			    p->reg = reg[opnum] & 0x7;
 			  }
-			else if (x & IND)
+			else if ((x & MODE) == POSTINC)
 			  {
-			    p->type = X (OP_DISP, size);
-			    p->reg = rn & 0x7;
+			    /* Use the instruction to determine 
+			       the operand size.  */
+			    p->type = X (OP_POSTINC, OP_SIZE (q->how));
+			    p->reg = reg[opnum] & 0x7;
+			  }
+			else if ((x & MODE) == PREDEC)
+			  {
+			    /* Use the instruction to determine 
+			       the operand size.  */
+			    p->type = X (OP_PREDEC, OP_SIZE (q->how));
+			    p->reg = reg[opnum] & 0x7;
+			  }
+			else if ((x & MODE) == POSTDEC)
+			  {
+			    /* Use the instruction to determine 
+			       the operand size.  */
+			    p->type = X (OP_POSTDEC, OP_SIZE (q->how));
+			    p->reg = reg[opnum] & 0x7;
+			  }
+			else if ((x & MODE) == IND)
+			  {
+			    /* Note: an indirect is transformed into
+			       a displacement of zero.  
+			    */
+			    /* Use the instruction to determine 
+			       the operand size.  */
+			    p->type = X (OP_DISP, OP_SIZE (q->how));
+			    p->reg = reg[opnum] & 0x7;
 			    p->literal = 0;
+			    if (OP_KIND (q->how) == O_JSR ||
+				OP_KIND (q->how) == O_JMP)
+			      if (lvalue (sd, p->type, p->reg, &p->type))
+				goto end;
 			  }
-			else if (x & (ABS | ABSJMP | ABS8MEM))
+			else if ((x & MODE) == ABS)
 			  {
-			    p->type = X (OP_DISP, size);
-			    p->literal = abs;
-			    p->reg = 8;
+			    /* Note: a 16 or 32 bit ABS is transformed into a 
+			       displacement from pseudo-register ZERO_REGNUM,
+			       which is always zero.  An 8 bit ABS becomes
+			       a displacement from SBR_REGNUM.
+			    */
+			    /* Use the instruction to determine 
+			       the operand size.  */
+			    p->type = X (OP_DISP, OP_SIZE (q->how));
+			    p->literal = cst[opnum];
+
+			    /* 8-bit ABS is displacement from SBR.
+			       16 and 32-bit ABS are displacement from ZERO.
+			       (SBR will always be zero except for h8/sx)
+			    */
+			    if ((x & SIZE) == L_8)
+			      p->reg = SBR_REGNUM;
+			    else
+			      p->reg = ZERO_REGNUM;;
 			  }
-			else if (x & MEMIND)
+			else if ((x & MODE) == MEMIND)
 			  {
-			    p->type = X (OP_MEM, size);
-			    p->literal = abs;
+			    /* Size doesn't matter.  */
+			    p->type = X (OP_MEM, SB);
+			    p->literal = cst[opnum];
+			    if (OP_KIND (q->how) == O_JSR ||
+				OP_KIND (q->how) == O_JMP)
+			      if (lvalue (sd, p->type, p->reg, &p->type))
+				goto end;
 			  }
-			else if (x & PCREL)
+			else if ((x & MODE) == PCREL)
 			  {
-			    p->type = X (OP_PCREL, size);
-			    p->literal = abs + addr + 2;
-			    if (x & L_16)
-			      p->literal += 2;
+			    /* Size doesn't matter.  */
+			    p->type = X (OP_PCREL, SB);
+			    p->literal = cst[opnum];
 			  }
 			else if (x & ABSJMP)
 			  {
 			    p->type = X (OP_IMM, SP);
-			    p->literal = abs;
+			    p->literal = cst[opnum];
+			  }
+			else if ((x & MODE) == INDEXB ||
+				 (x & MODE) == INDEXW ||
+				 (x & MODE) == INDEXL ||
+				 (x & MODE) == DISP)
+			  {
+			    /* Use the instruction to determine 
+			       the operand size.  */
+			    switch (x & MODE) {
+			    case INDEXB:
+			      p->type = X (OP_INDEXB, OP_SIZE (q->how));
+			      break;
+			    case INDEXW:
+			      p->type = X (OP_INDEXW, OP_SIZE (q->how));
+			      break;
+			    case INDEXL:
+			      p->type = X (OP_INDEXL, OP_SIZE (q->how));
+			      break;
+			    case DISP:
+			      p->type = X (OP_DISP,   OP_SIZE (q->how));
+			      break;
+			    }
+
+			    p->literal = cst[opnum];
+			    p->reg     = rdisp[opnum];
 			  }
-			else if (x & DISP)
+			else if (x & CTRL)
 			  {
-			    p->type = X (OP_DISP, size);
-			    p->literal = abs;
-			    p->reg = rdisp & 0x7;
+			    switch (reg[opnum])
+			      {
+			      case C_CCR:
+				p->type = X (OP_CCR, SB);
+				break;
+			      case C_EXR:
+				p->type = X (OP_EXR, SB);
+				break;
+			      case C_MACH:
+				p->type = X (OP_MACH, SL);
+				break;
+			      case C_MACL:
+				p->type = X (OP_MACL, SL);
+				break;
+			      case C_VBR:
+				p->type = X (OP_VBR, SL);
+				break;
+			      case C_SBR:
+				p->type = X (OP_SBR, SL);
+				break;
+			      }
 			  }
-			else if (x & CCR)
+			else if ((x & MODE) == CCR)
 			  {
 			    p->type = OP_CCR;
 			  }
-			else if (x & EXR)
+			else if ((x & MODE) == EXR)
 			  {
 			    p->type = OP_EXR;
 			  }
 			else
-			  printf ("Hmmmm %x", x);
+			  printf ("Hmmmm %x...\n", x);
 
 			args++;
 		      }
 		  }
 
-		  /* But a jmp or a jsr gets automagically lvalued,
-		     since we branch to their address not their
-		     contents.  */
-		  if (q->how == O (O_JSR, SB)
-		      || q->how == O (O_JMP, SB))
-		    {
-		      dst->src.type = lvalue (dst->src.type, dst->src.reg);
-		    }
-
+		  /* Unary operators: treat src and dst as equivalent.  */
 		  if (dst->dst.type == -1)
 		    dst->dst = dst->src;
+		  if (dst->src.type == -1)
+		    dst->src = dst->dst;
 
 		  dst->opcode = q->how;
 		  dst->cycles = q->time;
 
-		  /* And a jsr to these locations are turned into magic
-		     traps.  */
+		  /* And jsr's to these locations are turned into 
+		     magic traps.  */
 
-		  if (dst->opcode == O (O_JSR, SB))
+		  if (OP_KIND (dst->opcode) == O_JSR)
 		    {
 		      switch (dst->src.literal)
 			{
@@ -509,165 +1168,344 @@ decode (int addr, unsigned char *data, decoded_inst *dst)
     fail:
       ;
     }
-
+ end:
   /* Fell off the end.  */
   dst->opcode = O (O_ILL, SB);
 }
 
 static void
-compile (int pc)
+compile (SIM_DESC sd, int pc)
 {
   int idx;
 
   /* Find the next cache entry to use.  */
-  idx = cpu.cache_top + 1;
-  cpu.compiles++;
-  if (idx >= cpu.csize)
+  idx = h8_get_cache_top (sd) + 1;
+  h8_increment_compiles (sd);
+  if (idx >= sd->sim_cache_size)
     {
       idx = 1;
     }
-  cpu.cache_top = idx;
+  h8_set_cache_top (sd, idx);
 
   /* Throw away its old meaning.  */
-  cpu.cache_idx[cpu.cache[idx].oldpc] = 0;
+  h8_set_cache_idx (sd, sd->sim_cache[idx].oldpc, 0);
 
   /* Set to new address.  */
-  cpu.cache[idx].oldpc = pc;
+  sd->sim_cache[idx].oldpc = pc;
 
   /* Fill in instruction info.  */
-  decode (pc, cpu.memory + pc, cpu.cache + idx);
+  decode (sd, pc, h8_get_memory_buf (sd) + pc, sd->sim_cache + idx);
 
   /* Point to new cache entry.  */
-  cpu.cache_idx[pc] = idx;
+  h8_set_cache_idx (sd, pc, idx);
 }
 
 
-static unsigned char *breg[18];
-static unsigned short *wreg[18];
-static unsigned int *lreg[18];
-
-#define GET_B_REG(x) *(breg[x])
-#define SET_B_REG(x,y) (*(breg[x])) = (y)
-#define GET_W_REG(x) *(wreg[x])
-#define SET_W_REG(x,y) (*(wreg[x])) = (y)
-
-#define GET_L_REG(x) *(lreg[x])
-#define SET_L_REG(x,y) (*(lreg[x])) = (y)
-
-#define GET_MEMORY_L(x) \
-  (x < memory_size \
-   ? ((cpu.memory[x+0] << 24) | (cpu.memory[x+1] << 16) \
-      | (cpu.memory[x+2] << 8) | cpu.memory[x+3]) \
-   : ((cpu.eightbit[(x+0) & 0xff] << 24) | (cpu.eightbit[(x+1) & 0xff] << 16) \
-      | (cpu.eightbit[(x+2) & 0xff] << 8) | cpu.eightbit[(x+3) & 0xff]))
-
-#define GET_MEMORY_W(x) \
-  (x < memory_size \
-   ? ((cpu.memory[x+0] << 8) | (cpu.memory[x+1] << 0)) \
-   : ((cpu.eightbit[(x+0) & 0xff] << 8) | (cpu.eightbit[(x+1) & 0xff] << 0)))
-
-
-#define GET_MEMORY_B(x) \
-  (x < memory_size ? (cpu.memory[x]) : (cpu.eightbit[x & 0xff]))
+static unsigned char  *breg[32];
+static unsigned short *wreg[16];
+static unsigned int   *lreg[18];
+
+#define GET_B_REG(X)     *(breg[X])
+#define SET_B_REG(X, Y) (*(breg[X])) = (Y)
+#define GET_W_REG(X)     *(wreg[X])
+#define SET_W_REG(X, Y) (*(wreg[X])) = (Y)
+#define GET_L_REG(X)     h8_get_reg (sd, X)
+#define SET_L_REG(X, Y)  h8_set_reg (sd, X, Y)
+
+#define GET_MEMORY_L(X) \
+  ((X) < memory_size \
+   ? ((h8_get_memory (sd, (X)+0) << 24) | (h8_get_memory (sd, (X)+1) << 16)  \
+    | (h8_get_memory (sd, (X)+2) <<  8) | (h8_get_memory (sd, (X)+3) <<  0)) \
+   : ((h8_get_eightbit (sd, ((X)+0) & 0xff) << 24) \
+    | (h8_get_eightbit (sd, ((X)+1) & 0xff) << 16) \
+    | (h8_get_eightbit (sd, ((X)+2) & 0xff) <<  8) \
+    | (h8_get_eightbit (sd, ((X)+3) & 0xff) <<  0)))
+
+#define GET_MEMORY_W(X) \
+  ((X) < memory_size \
+   ? ((h8_get_memory   (sd, (X)+0) << 8) \
+    | (h8_get_memory   (sd, (X)+1) << 0)) \
+   : ((h8_get_eightbit (sd, ((X)+0) & 0xff) << 8) \
+    | (h8_get_eightbit (sd, ((X)+1) & 0xff) << 0)))
+
+
+#define GET_MEMORY_B(X) \
+  ((X) < memory_size ? (h8_get_memory   (sd, (X))) \
+                     : (h8_get_eightbit (sd, (X) & 0xff)))
+
+#define SET_MEMORY_L(X, Y)  \
+{  register unsigned char *_p; register int __y = (Y); \
+   _p = ((X) < memory_size ? h8_get_memory_buf   (sd) +  (X) : \
+                             h8_get_eightbit_buf (sd) + ((X) & 0xff)); \
+   _p[0] = __y >> 24; _p[1] = __y >> 16; \
+   _p[2] = __y >>  8; _p[3] = __y >>  0; \
+}
 
-#define SET_MEMORY_L(x,y)  \
-{  register unsigned char *_p; register int __y = y; \
-   _p = (x < memory_size ? cpu.memory+x : cpu.eightbit + (x & 0xff)); \
-   _p[0] = (__y)>>24; _p[1] = (__y)>>16; \
-   _p[2] = (__y)>>8; _p[3] = (__y)>>0;}
+#define SET_MEMORY_W(X, Y) \
+{  register unsigned char *_p; register int __y = (Y); \
+   _p = ((X) < memory_size ? h8_get_memory_buf   (sd) +  (X) : \
+                             h8_get_eightbit_buf (sd) + ((X) & 0xff)); \
+   _p[0] = __y >> 8; _p[1] = __y; \
+}
 
-#define SET_MEMORY_W(x,y) \
-{  register unsigned char *_p; register int __y = y; \
-   _p = (x < memory_size ? cpu.memory+x : cpu.eightbit + (x & 0xff)); \
-   _p[0] = (__y)>>8; _p[1] =(__y);}
+#define SET_MEMORY_B(X, Y) \
+  ((X) < memory_size ? (h8_set_memory   (sd, (X), (Y))) \
+                     : (h8_set_eightbit (sd, (X) & 0xff, (Y))))
 
-#define SET_MEMORY_B(x,y) \
-  (x < memory_size ? (cpu.memory[(x)] = y) : (cpu.eightbit[x & 0xff] = y))
+/* Simulate a memory fetch.
+   Return 0 for success, -1 for failure.
+*/
 
 static int
-fetch (ea_type *arg)
+fetch_1 (SIM_DESC sd, ea_type *arg, int *val, int twice)
 {
   int rn = arg->reg;
   int abs = arg->literal;
   int r;
   int t;
 
+  if (val == NULL)
+    return -1;		/* Paranoia.  */
+
   switch (arg->type)
     {
-    case X (OP_REG, SB):
-      return GET_B_REG (rn);
-    case X (OP_REG, SW):
-      return GET_W_REG (rn);
-    case X (OP_REG, SL):
-      return GET_L_REG (rn);
-    case X (OP_IMM, SB):
-    case X (OP_IMM, SW):
-    case X (OP_IMM, SL):
-      return abs;
-    case X (OP_DEC, SB):
-      abort ();
-
-    case X (OP_INC, SB):
+      /* Indexed register plus displacement mode:
+
+	 This new family of addressing modes are similar to OP_DISP
+	 (register plus displacement), with two differences:
+	   1) INDEXB uses only the least significant byte of the register,
+	      INDEXW uses only the least significant word, and
+	      INDEXL uses the entire register (just like OP_DISP).
+	 and
+	   2) The displacement value in abs is multiplied by two
+	      for SW-sized operations, and by four for SL-size.
+
+	This gives nine possible variations.
+      */
+
+    case X (OP_INDEXB, SB):
+    case X (OP_INDEXB, SW):
+    case X (OP_INDEXB, SL):
+    case X (OP_INDEXW, SB):
+    case X (OP_INDEXW, SW):
+    case X (OP_INDEXW, SL):
+    case X (OP_INDEXL, SB):
+    case X (OP_INDEXL, SW):
+    case X (OP_INDEXL, SL):
+      t = GET_L_REG (rn);
+      switch (OP_KIND (arg->type)) {
+      case OP_INDEXB:	t &= 0xff;	break;
+      case OP_INDEXW:	t &= 0xffff;	break;
+      case OP_INDEXL:
+      default:		break;
+      }
+      switch (OP_SIZE (arg->type)) {
+      case SB:
+	*val = GET_MEMORY_B ((t * 1 + abs) & h8_get_mask (sd));
+	break;
+      case SW:
+	*val = GET_MEMORY_W ((t * 2 + abs) & h8_get_mask (sd));
+	break;
+      case SL:
+	*val = GET_MEMORY_L ((t * 4 + abs) & h8_get_mask (sd));
+	break;
+      }
+      break;
+
+    case X (OP_LOWREG, SB):
+      *val = GET_L_REG (rn) & 0xff;
+      break;
+    case X (OP_LOWREG, SW):
+      *val = GET_L_REG (rn) & 0xffff; 
+      break;
+
+    case X (OP_REG, SB):	/* Register direct, byte.  */
+      *val = GET_B_REG (rn);
+      break;
+    case X (OP_REG, SW):	/* Register direct, word.  */
+      *val = GET_W_REG (rn);
+      break;
+    case X (OP_REG, SL):	/* Register direct, long.  */
+      *val = GET_L_REG (rn);
+      break;
+    case X (OP_IMM, SB):	/* Immediate, byte.  */
+    case X (OP_IMM, SW):	/* Immediate, word.  */
+    case X (OP_IMM, SL):	/* Immediate, long.  */
+      *val = abs;
+      break;
+    case X (OP_POSTINC, SB):	/* Register indirect w/post-incr: byte.  */
+      t = GET_L_REG (rn);
+      t &= h8_get_mask (sd);
+      r = GET_MEMORY_B (t);
+      if (!twice)
+	t += 1;
+      t = t & h8_get_mask (sd);
+      SET_L_REG (rn, t);
+      *val = r;
+      break;
+    case X (OP_POSTINC, SW):	/* Register indirect w/post-incr: word.  */
+      t = GET_L_REG (rn);
+      t &= h8_get_mask (sd);
+      r = GET_MEMORY_W (t);
+      if (!twice)
+	t += 2;
+      t = t & h8_get_mask (sd);
+      SET_L_REG (rn, t);
+      *val = r;
+      break;
+    case X (OP_POSTINC, SL):	/* Register indirect w/post-incr: long.  */
+      t = GET_L_REG (rn);
+      t &= h8_get_mask (sd);
+      r = GET_MEMORY_L (t);
+      if (!twice)
+	t += 4;
+      t = t & h8_get_mask (sd);
+      SET_L_REG (rn, t);
+      *val = r;
+      break;
+
+    case X (OP_POSTDEC, SB):	/* Register indirect w/post-decr: byte.  */
       t = GET_L_REG (rn);
-      t &= cpu.mask;
+      t &= h8_get_mask (sd);
       r = GET_MEMORY_B (t);
-      t++;
-      t = t & cpu.mask;
+      if (!twice)
+	t -= 1;
+      t = t & h8_get_mask (sd);
       SET_L_REG (rn, t);
-      return r;
+      *val = r;
       break;
-    case X (OP_INC, SW):
+    case X (OP_POSTDEC, SW):	/* Register indirect w/post-decr: word.  */
       t = GET_L_REG (rn);
-      t &= cpu.mask;
+      t &= h8_get_mask (sd);
       r = GET_MEMORY_W (t);
-      t += 2;
-      t = t & cpu.mask;
+      if (!twice)
+	t -= 2;
+      t = t & h8_get_mask (sd);
       SET_L_REG (rn, t);
-      return r;
-    case X (OP_INC, SL):
+      *val = r;
+      break;
+    case X (OP_POSTDEC, SL):	/* Register indirect w/post-decr: long.  */
       t = GET_L_REG (rn);
-      t &= cpu.mask;
+      t &= h8_get_mask (sd);
       r = GET_MEMORY_L (t);
+      if (!twice)
+	t -= 4;
+      t = t & h8_get_mask (sd);
+      SET_L_REG (rn, t);
+      *val = r;
+      break;
+
+    case X (OP_PREDEC, SB):	/* Register indirect w/pre-decr: byte.  */
+      t = GET_L_REG (rn) - 1;
+      t &= h8_get_mask (sd);
+      SET_L_REG (rn, t);
+      *val = GET_MEMORY_B (t);
+      break;
+      
+    case X (OP_PREDEC, SW):	/* Register indirect w/pre-decr: word.  */
+      t = GET_L_REG (rn) - 2;
+      t &= h8_get_mask (sd);
+      SET_L_REG (rn, t);
+      *val = GET_MEMORY_W (t);
+      break;
+      
+    case X (OP_PREDEC, SL):	/* Register indirect w/pre-decr: long.  */
+      t = GET_L_REG (rn) - 4;
+      t &= h8_get_mask (sd);
+      SET_L_REG (rn, t);
+      *val = GET_MEMORY_L (t);
+      break;
+      
+    case X (OP_PREINC, SB):	/* Register indirect w/pre-incr: byte.  */
+      t = GET_L_REG (rn) + 1;
+      t &= h8_get_mask (sd);
+      SET_L_REG (rn, t);
+      *val = GET_MEMORY_B (t);
+      break;
 
-      t += 4;
-      t = t & cpu.mask;
+    case X (OP_PREINC, SW):	/* Register indirect w/pre-incr: long.  */
+      t = GET_L_REG (rn) + 2;
+      t &= h8_get_mask (sd);
       SET_L_REG (rn, t);
-      return r;
+      *val = GET_MEMORY_W (t);
+      break;
 
-    case X (OP_DISP, SB):
+    case X (OP_PREINC, SL):	/* Register indirect w/pre-incr: long.  */
+      t = GET_L_REG (rn) + 4;
+      t &= h8_get_mask (sd);
+      SET_L_REG (rn, t);
+      *val = GET_MEMORY_L (t);
+      break;
+
+    case X (OP_DISP, SB):	/* Register indirect w/displacement: byte.  */
       t = GET_L_REG (rn) + abs;
-      t &= cpu.mask;
-      return GET_MEMORY_B (t);
+      t &= h8_get_mask (sd);
+      *val = GET_MEMORY_B (t);
+      break;
 
-    case X (OP_DISP, SW):
+    case X (OP_DISP, SW):	/* Register indirect w/displacement: word.  */
       t = GET_L_REG (rn) + abs;
-      t &= cpu.mask;
-      return GET_MEMORY_W (t);
+      t &= h8_get_mask (sd);
+      *val = GET_MEMORY_W (t);
+      break;
 
-    case X (OP_DISP, SL):
+    case X (OP_DISP, SL):	/* Register indirect w/displacement: long.  */
       t = GET_L_REG (rn) + abs;
-      t &= cpu.mask;
-      return GET_MEMORY_L (t);
+      t &= h8_get_mask (sd);
+      *val =GET_MEMORY_L (t);
+      break;
 
-    case X (OP_MEM, SL):
+    case X (OP_MEM, SL):	/* Absolute memory address, long.  */
       t = GET_MEMORY_L (abs);
-      t &= cpu.mask;
-      return t;
+      t &= h8_get_mask (sd);
+      *val = t;
+      break;
 
-    case X (OP_MEM, SW):
+    case X (OP_MEM, SW):	/* Absolute memory address, word.  */
       t = GET_MEMORY_W (abs);
-      t &= cpu.mask;
-      return t;
+      t &= h8_get_mask (sd);
+      *val = t;
+      break;
 
-    default:
-      abort (); /* ?? May be something more usefull? */
+    case X (OP_PCREL, SB):	/* PC relative (for jump, branch etc).  */
+    case X (OP_PCREL, SW):
+    case X (OP_PCREL, SL):
+    case X (OP_PCREL, SN):
+      *val = abs;
+      break;
 
+    case X (OP_MEM, SB):	/* Why isn't this implemented?  */
+    default:
+      sim_engine_set_run_state (sd, sim_stopped, SIGSEGV);
+      return -1;
     }
+  return 0;	/* Success.  */
 }
 
+/* Normal fetch.  */
 
-static void
-store (ea_type *arg, int n)
+static int
+fetch (SIM_DESC sd, ea_type *arg, int *val)
+{
+  return fetch_1 (sd, arg, val, 0);
+}
+
+/* Fetch which will be followed by a store to the same location.
+   The difference being that we don't want to do a post-increment
+   or post-decrement at this time: we'll do it when we store.  */
+
+static int
+fetch2 (SIM_DESC sd, ea_type *arg, int *val)
+{
+  return fetch_1 (sd, arg, val, 1);
+}
+
+/* Simulate a memory store.
+   Return 0 for success, -1 for failure.
+*/
+
+static int
+store_1 (SIM_DESC sd, ea_type *arg, int n, int twice)
 {
   int rn = arg->reg;
   int abs = arg->literal;
@@ -675,57 +1513,195 @@ store (ea_type *arg, int n)
 
   switch (arg->type)
     {
-    case X (OP_REG, SB):
+      /* Indexed register plus displacement mode:
+
+	 This new family of addressing modes are similar to OP_DISP
+	 (register plus displacement), with two differences:
+	   1) INDEXB uses only the least significant byte of the register,
+	      INDEXW uses only the least significant word, and
+	      INDEXL uses the entire register (just like OP_DISP).
+	 and
+	   2) The displacement value in abs is multiplied by two
+	      for SW-sized operations, and by four for SL-size.
+
+	This gives nine possible variations.
+      */
+
+    case X (OP_INDEXB, SB):
+    case X (OP_INDEXB, SW):
+    case X (OP_INDEXB, SL):
+    case X (OP_INDEXW, SB):
+    case X (OP_INDEXW, SW):
+    case X (OP_INDEXW, SL):
+    case X (OP_INDEXL, SB):
+    case X (OP_INDEXL, SW):
+    case X (OP_INDEXL, SL):
+      t = GET_L_REG (rn);
+      switch (OP_KIND (arg->type)) {
+      case OP_INDEXB:	t &= 0xff;	break;
+      case OP_INDEXW:	t &= 0xffff;	break;
+      case OP_INDEXL:
+      default:		break;
+      }
+      switch (OP_SIZE (arg->type)) {
+      case SB:
+	SET_MEMORY_B ((t * 1 + abs) & h8_get_mask (sd), n);
+	break;
+      case SW:
+	SET_MEMORY_W ((t * 2 + abs) & h8_get_mask (sd), n);
+	break;
+      case SL:
+	SET_MEMORY_L ((t * 4 + abs) & h8_get_mask (sd), n);
+	break;
+      }
+      break;
+
+    case X (OP_REG, SB):	/* Register direct, byte.  */
       SET_B_REG (rn, n);
       break;
-    case X (OP_REG, SW):
+    case X (OP_REG, SW):	/* Register direct, word.  */
       SET_W_REG (rn, n);
       break;
-    case X (OP_REG, SL):
+    case X (OP_REG, SL):	/* Register direct, long.  */
       SET_L_REG (rn, n);
       break;
 
-    case X (OP_DEC, SB):
-      t = GET_L_REG (rn) - 1;
-      t &= cpu.mask;
+    case X (OP_PREDEC, SB):	/* Register indirect w/pre-decr, byte.  */
+      t = GET_L_REG (rn);
+      if (!twice)
+	t -= 1;
+      t &= h8_get_mask (sd);
+      SET_L_REG (rn, t);
+      SET_MEMORY_B (t, n);
+
+      break;
+    case X (OP_PREDEC, SW):	/* Register indirect w/pre-decr, word.  */
+      t = GET_L_REG (rn);
+      if (!twice)
+	t -= 2;
+      t &= h8_get_mask (sd);
+      SET_L_REG (rn, t);
+      SET_MEMORY_W (t, n);
+      break;
+
+    case X (OP_PREDEC, SL):	/* Register indirect w/pre-decr, long.  */
+      t = GET_L_REG (rn);
+      if (!twice)
+	t -= 4;
+      t &= h8_get_mask (sd);
+      SET_L_REG (rn, t);
+      SET_MEMORY_L (t, n);
+      break;
+
+    case X (OP_PREINC, SB):	/* Register indirect w/pre-incr, byte.  */
+      t = GET_L_REG (rn);
+      if (!twice)
+	t += 1;
+      t &= h8_get_mask (sd);
       SET_L_REG (rn, t);
       SET_MEMORY_B (t, n);
 
       break;
-    case X (OP_DEC, SW):
-      t = (GET_L_REG (rn) - 2) & cpu.mask;
+    case X (OP_PREINC, SW):	/* Register indirect w/pre-incr, word.  */
+      t = GET_L_REG (rn);
+      if (!twice)
+	t += 2;
+      t &= h8_get_mask (sd);
       SET_L_REG (rn, t);
       SET_MEMORY_W (t, n);
       break;
 
-    case X (OP_DEC, SL):
-      t = (GET_L_REG (rn) - 4) & cpu.mask;
+    case X (OP_PREINC, SL):	/* Register indirect w/pre-incr, long.  */
+      t = GET_L_REG (rn);
+      if (!twice)
+	t += 4;
+      t &= h8_get_mask (sd);
       SET_L_REG (rn, t);
       SET_MEMORY_L (t, n);
       break;
 
-    case X (OP_DISP, SB):
+    case X (OP_POSTDEC, SB):	/* Register indirect w/post-decr, byte.  */
+      t = GET_L_REG (rn) & h8_get_mask (sd);
+      SET_MEMORY_B (t, n);
+      SET_L_REG (rn, t - 1);
+      break;
+
+    case X (OP_POSTDEC, SW):	/* Register indirect w/post-decr, word.  */
+      t = GET_L_REG (rn) & h8_get_mask (sd);
+      SET_MEMORY_W (t, n);
+      SET_L_REG (rn, t - 2);
+      break;
+
+    case X (OP_POSTDEC, SL):	/* Register indirect w/post-decr, long.  */
+      t = GET_L_REG (rn) & h8_get_mask (sd);
+      SET_MEMORY_L (t, n);
+      SET_L_REG (rn, t - 4);
+      break;
+
+    case X (OP_POSTINC, SB):	/* Register indirect w/post-incr, byte.  */
+      t = GET_L_REG (rn) & h8_get_mask (sd);
+      SET_MEMORY_B (t, n);
+      SET_L_REG (rn, t + 1);
+      break;
+
+    case X (OP_POSTINC, SW):	/* Register indirect w/post-incr, word.  */
+      t = GET_L_REG (rn) & h8_get_mask (sd);
+      SET_MEMORY_W (t, n);
+      SET_L_REG (rn, t + 2);
+      break;
+
+    case X (OP_POSTINC, SL):	/* Register indirect w/post-incr, long.  */
+      t = GET_L_REG (rn) & h8_get_mask (sd);
+      SET_MEMORY_L (t, n);
+      SET_L_REG (rn, t + 4);
+      break;
+
+    case X (OP_DISP, SB):	/* Register indirect w/displacement, byte.  */
       t = GET_L_REG (rn) + abs;
-      t &= cpu.mask;
+      t &= h8_get_mask (sd);
       SET_MEMORY_B (t, n);
       break;
 
-    case X (OP_DISP, SW):
+    case X (OP_DISP, SW):	/* Register indirect w/displacement, word.  */
       t = GET_L_REG (rn) + abs;
-      t &= cpu.mask;
+      t &= h8_get_mask (sd);
       SET_MEMORY_W (t, n);
       break;
 
-    case X (OP_DISP, SL):
+    case X (OP_DISP, SL):	/* Register indirect w/displacement, long.  */
       t = GET_L_REG (rn) + abs;
-      t &= cpu.mask;
+      t &= h8_get_mask (sd);
       SET_MEMORY_L (t, n);
       break;
+
+
+    case X (OP_MEM, SB):	/* Why isn't this implemented?  */
+    case X (OP_MEM, SW):	/* Why isn't this implemented?  */
+    case X (OP_MEM, SL):	/* Why isn't this implemented?  */
     default:
-      abort ();
+      sim_engine_set_run_state (sd, sim_stopped, SIGSEGV);
+      return -1;
     }
+  return 0;
 }
 
+/* Normal store.  */
+
+static int
+store (SIM_DESC sd, ea_type *arg, int n)
+{
+  return store_1 (sd, arg, n, 0);
+}
+
+/* Store which follows a fetch from the same location.
+   The difference being that we don't want to do a pre-increment
+   or pre-decrement at this time: it was already done when we fetched.  */
+
+static int
+store2 (SIM_DESC sd, ea_type *arg, int n)
+{
+  return store_1 (sd, arg, n, 1);
+}
 
 static union
 {
@@ -736,20 +1712,18 @@ static union
       char high;
     }
   u;
-}
+} littleendian;
 
-littleendian;
+/* Flag to be set whenever a new SIM_DESC object is created.  */
+static int init_pointers_needed = 1;
 
 static void
-init_pointers (void)
+init_pointers (SIM_DESC sd)
 {
-  static int init;
-
-  if (!init)
+  if (init_pointers_needed)
     {
       int i;
 
-      init = 1;
       littleendian.i = 1;
 
       if (h8300smode)
@@ -758,39 +1732,55 @@ init_pointers (void)
 	memory_size = H8300H_MSIZE;
       else
 	memory_size = H8300_MSIZE;
-      cpu.memory = (unsigned char *) calloc (sizeof (char), memory_size);
-      cpu.cache_idx = (unsigned short *) calloc (sizeof (short), memory_size);
-      cpu.eightbit = (unsigned char *) calloc (sizeof (char), 256);
-
       /* `msize' must be a power of two.  */
       if ((memory_size & (memory_size - 1)) != 0)
-	abort ();
-      cpu.mask = memory_size - 1;
-
-      for (i = 0; i < 9; i++)
 	{
-	  cpu.regs[i] = 0;
+	  (*sim_callback->printf_filtered) 
+	    (sim_callback,
+	     "init_pointers: bad memory size %d, defaulting to %d.\n", 
+	     memory_size, memory_size = H8300S_MSIZE);
 	}
 
+      if (h8_get_memory_buf (sd))
+	free (h8_get_memory_buf (sd));
+      if (h8_get_cache_idx_buf (sd))
+	free (h8_get_cache_idx_buf (sd));
+      if (h8_get_eightbit_buf (sd))
+	free (h8_get_eightbit_buf (sd));
+
+      h8_set_memory_buf (sd, (unsigned char *) 
+			 calloc (sizeof (char), memory_size));
+      h8_set_cache_idx_buf (sd, (unsigned short *) 
+			    calloc (sizeof (short), memory_size));
+      sd->memory_size = memory_size;
+      h8_set_eightbit_buf (sd, (unsigned char *) calloc (sizeof (char), 256));
+
+      h8_set_mask (sd, memory_size - 1);
+
+      memset (h8_get_reg_buf (sd), 0, sizeof (((STATE_CPU (sd, 0))->regs)));
+
       for (i = 0; i < 8; i++)
 	{
-	  unsigned char *p = (unsigned char *) (cpu.regs + i);
-	  unsigned char *e = (unsigned char *) (cpu.regs + i + 1);
-	  unsigned short *q = (unsigned short *) (cpu.regs + i);
-	  unsigned short *u = (unsigned short *) (cpu.regs + i + 1);
-	  cpu.regs[i] = 0x00112233;
+	  /* FIXME: rewrite using local buffer.  */
+	  unsigned char *p = (unsigned char *) (h8_get_reg_buf (sd) + i);
+	  unsigned char *e = (unsigned char *) (h8_get_reg_buf (sd) + i + 1);
+	  unsigned short *q = (unsigned short *) (h8_get_reg_buf (sd) + i);
+	  unsigned short *u = (unsigned short *) (h8_get_reg_buf (sd) + i + 1);
+	  h8_set_reg (sd, i, 0x00112233);
+
 	  while (p < e)
 	    {
 	      if (*p == 0x22)
-		{
 		  breg[i] = p;
-		}
 	      if (*p == 0x33)
-		{
 		  breg[i + 8] = p;
-		}
+	      if (*p == 0x11)
+		breg[i + 16] = p;
+	      if (*p == 0x00)
+		breg[i + 24] = p;
 	      p++;
 	    }
+
 	  wreg[i] = wreg[i + 8] = 0;
 	  while (q < u)
 	    {
@@ -804,196 +1794,60 @@ init_pointers (void)
 		}
 	      q++;
 	    }
+
 	  if (wreg[i] == 0 || wreg[i + 8] == 0)
-	    abort ();
-	  cpu.regs[i] = 0;
-	  lreg[i] = &cpu.regs[i];
+	    (*sim_callback->printf_filtered) (sim_callback, 
+					      "init_pointers: internal error.\n");
+
+	  h8_set_reg (sd, i, 0);
+	  lreg[i] = h8_get_reg_buf (sd) + i;
 	}
 
-      lreg[8] = &cpu.regs[8];
+      /* Note: sim uses pseudo-register ZERO as a zero register.  */
+      lreg[ZERO_REGNUM] = h8_get_reg_buf (sd) + ZERO_REGNUM;
+      init_pointers_needed = 0;
 
       /* Initialize the seg registers.  */
-      if (!cpu.cache)
-	sim_set_simcache_size (CSIZE);
+      if (!sd->sim_cache)
+	set_simcache_size (sd, CSIZE);
     }
 }
 
+/* Grotty global variable for use by control_c signal handler.  */
+static SIM_DESC control_c_sim_desc;
+
 static void
 control_c (int sig)
 {
-  cpu.state = SIM_STATE_STOPPED;
-  cpu.exception = SIGINT;
+  sim_engine_set_run_state (control_c_sim_desc, sim_stopped, SIGINT);
 }
 
-#define C (c != 0)
-#define Z (nz == 0)
-#define V (v != 0)
-#define N (n != 0)
-#define U (u != 0)
-#define H (h != 0)
-#define UI (ui != 0)
-#define I (intMaskBit != 0)
-
-static int
-mop (decoded_inst *code, int bsize, int sign)
+int
+sim_stop (SIM_DESC sd)
 {
-  int multiplier;
-  int multiplicand;
-  int result;
-  int n, nz;
-
-  if (sign)
-    {
-      multiplicand =
-	bsize ? SEXTCHAR (GET_W_REG (code->dst.reg)) :
-	SEXTSHORT (GET_W_REG (code->dst.reg));
-      multiplier =
-	bsize ? SEXTCHAR (GET_B_REG (code->src.reg)) :
-	SEXTSHORT (GET_W_REG (code->src.reg));
-    }
-  else
-    {
-      multiplicand = bsize ? UEXTCHAR (GET_W_REG (code->dst.reg)) :
-	UEXTSHORT (GET_W_REG (code->dst.reg));
-      multiplier =
-	bsize ? UEXTCHAR (GET_B_REG (code->src.reg)) :
-	UEXTSHORT (GET_W_REG (code->src.reg));
-
-    }
-  result = multiplier * multiplicand;
-
-  if (sign)
-    {
-      n = result & (bsize ? 0x8000 : 0x80000000);
-      nz = result & (bsize ? 0xffff : 0xffffffff);
-    }
-  if (bsize)
-    {
-      SET_W_REG (code->dst.reg, result);
-    }
-  else
-    {
-      SET_L_REG (code->dst.reg, result);
-    }
-#if 0
-  return ((n == 1) << 1) | (nz == 1);
-#endif
-}
-
-#define ONOT(name, how) \
-case O (name, SB):				\
-{						\
-  int t;					\
-  int hm = 0x80;				\
-  rd = GET_B_REG (code->src.reg);		\
-  how; 						\
-  goto shift8;					\
-} 						\
-case O (name, SW):				\
-{ 						\
-  int t;					\
-  int hm = 0x8000;				\
-  rd = GET_W_REG (code->src.reg); 		\
-  how; 						\
-  goto shift16;					\
-} 						\
-case O (name, SL):				\
-{						\
-  int t;					\
-  int hm = 0x80000000; 				\
-  rd = GET_L_REG (code->src.reg);		\
-  how; 						\
-  goto shift32;					\
+  /* FIXME: use a real signal value.  */
+  sim_engine_set_run_state (sd, sim_stopped, SIGINT);
+  return 1;
 }
 
-#define OSHIFTS(name, how1, how2) \
+#define OBITOP(name, f, s, op) 			\
 case O (name, SB):				\
 {						\
-  int t;					\
-  int hm = 0x80;				\
-  rd = GET_B_REG (code->src.reg);		\
-  if ((GET_MEMORY_B (pc + 1) & 0x40) == 0)	\
-    {						\
-      how1;					\
-    }						\
-  else						\
-    {						\
-      how2;					\
-    }						\
-  goto shift8;					\
-} 						\
-case O (name, SW):				\
-{ 						\
-  int t;					\
-  int hm = 0x8000;				\
-  rd = GET_W_REG (code->src.reg); 		\
-  if ((GET_MEMORY_B (pc + 1) & 0x40) == 0)	\
-    {						\
-      how1;					\
-    }						\
-  else						\
-    {						\
-      how2;					\
-    }						\
-  goto shift16;					\
-} 						\
-case O (name, SL):				\
-{						\
-  int t;					\
-  int hm = 0x80000000; 				\
-  rd = GET_L_REG (code->src.reg);		\
-  if ((GET_MEMORY_B (pc + 1) & 0x40) == 0)	\
-    {						\
-      how1;					\
-    }						\
-  else						\
-    {						\
-      how2;					\
-    }						\
-  goto shift32;					\
-}
-
-#define OBITOP(name,f, s, op) 			\
-case O (name, SB):				\
-{						\
-  int m;					\
-  int b; 					\
-  if (f) ea = fetch (&code->dst);		\
-  m=1<< fetch (&code->src);			\
+  int m, tmp;					\
+	 					\
+  if (f)					\
+    if (fetch (sd, &code->dst, &ea))		\
+      goto end;					\
+  if (fetch (sd, &code->src, &tmp))		\
+    goto end;					\
+  m = 1 << tmp;					\
   op;						\
-  if (s) store (&code->dst,ea); goto next;	\
-}
-
-int
-sim_stop (SIM_DESC sd)
-{
-  cpu.state = SIM_STATE_STOPPED;
-  cpu.exception = SIGINT;
-  return 1;
+  if (s)					\
+    if (store (sd, &code->dst,ea))		\
+      goto end;					\
+  goto next;					\
 }
 
-#define R0_REGNUM	0
-#define R1_REGNUM	1
-#define R2_REGNUM	2
-#define R3_REGNUM	3
-#define R4_REGNUM	4
-#define R5_REGNUM	5
-#define R6_REGNUM	6
-#define R7_REGNUM	7
-
-#define SP_REGNUM       R7_REGNUM	/* Contains address of top of stack */
-#define FP_REGNUM       R6_REGNUM	/* Contains address of executing
-					 * stack frame */
-
-#define CCR_REGNUM      8	/* Contains processor status */
-#define PC_REGNUM       9	/* Contains program counter */
-
-#define CYCLE_REGNUM    10
-
-#define EXR_REGNUM	11
-#define INST_REGNUM     12
-#define TICK_REGNUM     13
-
 void
 sim_resume (SIM_DESC sd, int step, int siggnal)
 {
@@ -1012,55 +1866,63 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
   int c, nz, v, n, u, h, ui, intMaskBit;
   int trace, intMask;
   int oldmask;
-  init_pointers ();
+  enum sim_stop reason;
+  int sigrc;
 
+  init_pointers (sd);
+
+  control_c_sim_desc = sd;
   prev = signal (SIGINT, control_c);
 
   if (step)
     {
-      cpu.state = SIM_STATE_STOPPED;
-      cpu.exception = SIGTRAP;
+      sim_engine_set_run_state (sd, sim_stopped, SIGTRAP);
     }
   else
     {
-      cpu.state = SIM_STATE_RUNNING;
-      cpu.exception = 0;
+      sim_engine_set_run_state (sd, sim_running, 0);
     }
 
-  pc = cpu.pc;
+  pc = h8_get_pc (sd);
 
   /* The PC should never be odd.  */
   if (pc & 0x1)
-    abort ();
+    {
+      sim_engine_set_run_state (sd, sim_stopped, SIGBUS);
+      return;
+    }
 
-  GETSR ();
-  GETEXR ();
+  /* Get Status Register (flags).  */
+  c = (h8_get_ccr (sd) >> 0) & 1;
+  v = (h8_get_ccr (sd) >> 1) & 1;
+  nz = !((h8_get_ccr (sd) >> 2) & 1);
+  n = (h8_get_ccr (sd) >> 3) & 1;
+  u = (h8_get_ccr (sd) >> 4) & 1;
+  h = (h8_get_ccr (sd) >> 5) & 1;
+  ui = ((h8_get_ccr (sd) >> 6) & 1);
+  intMaskBit = (h8_get_ccr (sd) >> 7) & 1;
+
+  if (h8300smode)	/* Get exr.  */
+    {
+      trace = (h8_get_exr (sd) >> 7) & 1;
+      intMask = h8_get_exr (sd) & 7;
+    }
 
-  oldmask = cpu.mask;
+  oldmask = h8_get_mask (sd);
   if (!h8300hmode)
-    cpu.mask = 0xffff;
+    h8_set_mask (sd, 0xffff);
   do
     {
-      int cidx;
+      unsigned short cidx;
       decoded_inst *code;
 
     top:
-      cidx = cpu.cache_idx[pc];
-      code = cpu.cache + cidx;
-
-
-#define ALUOP(STORE, NAME, HOW) \
-    case O (NAME, SB): HOW; if (STORE) goto alu8;  else goto just_flags_alu8;  \
-    case O (NAME, SW): HOW; if (STORE) goto alu16; else goto just_flags_alu16; \
-    case O (NAME, SL): HOW; if (STORE) goto alu32; else goto just_flags_alu32;
-
-
-#define LOGOP(NAME, HOW)			\
-    case O (NAME, SB): HOW; goto log8;		\
-    case O (NAME, SW): HOW; goto log16;		\
-    case O (NAME, SL): HOW; goto log32;
-
-
+      cidx = h8_get_cache_idx (sd, pc);
+      if (cidx == (unsigned short) -1 ||
+	  cidx >= sd->sim_cache_size)
+	goto illegal;
+	  
+      code = sd->sim_cache + cidx;
 
 #if ADEBUG
       if (debug)
@@ -1068,8 +1930,7 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	  printf ("%x %d %s\n", pc, code->opcode,
 		  code->op ? code->op->name : "**");
 	}
-      cpu.stats[code->opcode]++;
-
+      h8_increment_stats (sd, code->opcode);
 #endif
 
       if (code->opcode)
@@ -1085,231 +1946,547 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	   * This opcode is a fake for when we get to an
 	   * instruction which hasnt been compiled
 	   */
-	  compile (pc);
+	  compile (sd, pc);
 	  goto top;
 	  break;
 
+	case O (O_MOVAB, SL):
+	case O (O_MOVAW, SL):
+	case O (O_MOVAL, SL):
+	  /* 1) Evaluate 2nd argument (dst).
+	     2) Mask / zero extend according to whether 1st argument (src)
+	        is INDEXB, INDEXW, or INDEXL.
+	     3) Left-shift the result by 0, 1 or 2, according to size of mova
+	        (mova/b, mova/w, mova/l).
+	     4) Add literal value of 1st argument (src).
+	     5) Store result in 3rd argument (op3).
+
+	  */
+	  if (fetch (sd, &code->dst, &ea))
+	    goto end;
+
+	  switch (OP_KIND (code->src.type)) {
+	  case OP_INDEXB:    ea = ea & 0xff;		break;
+	  case OP_INDEXW:    ea = ea & 0xffff;		break;
+	  case OP_INDEXL:    				break;
+	  default:	     goto illegal;
+	  }
+
+	  switch (code->opcode) {
+	  case O (O_MOVAB, SL):	    			break;
+	  case O (O_MOVAW, SL):	    ea = ea << 1;	break;
+	  case O (O_MOVAL, SL):     ea = ea << 2;	break;
+	  default: 		    goto illegal;
+	  }
+	  
+	  ea = ea + code->src.literal;
+
+	  if (store (sd, &code->op3, ea))
+	    goto end;
+
+	  goto next;	  
 
-	case O (O_SUBX, SB):
-	  rd = fetch (&code->dst);
-	  ea = fetch (&code->src);
+	case O (O_SUBX, SB):	/* subx, extended sub */
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+	  if (fetch (sd, &code->src, &ea))
+	    goto end;
 	  ea = -(ea + C);
 	  res = rd + ea;
 	  goto alu8;
 
-	case O (O_ADDX, SB):
-	  rd = fetch (&code->dst);
-	  ea = fetch (&code->src);
-	  ea = C + ea;
+	case O (O_SUBX, SW):	/* subx, extended sub */
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+	  if (fetch (sd, &code->src, &ea))
+	    goto end;
+	  ea = -(ea + C);
+	  res = rd + ea;
+	  goto alu16;
+
+	case O (O_SUBX, SL):	/* subx, extended sub */
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+	  if (fetch (sd, &code->src, &ea))
+	    goto end;
+	  ea = -(ea + C);
+	  res = rd + ea;
+	  goto alu32;
+
+	case O (O_ADDX, SB):	/* addx, extended add */
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+	  if (fetch (sd, &code->src, &ea))
+	    goto end;
+	  ea = ea + C;
 	  res = rd + ea;
 	  goto alu8;
 
-#define EA    ea = fetch (&code->src);
-#define RD_EA ea = fetch (&code->src); rd = fetch (&code->dst);
+	case O (O_ADDX, SW):	/* addx, extended add */
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+	  if (fetch (sd, &code->src, &ea))
+	    goto end;
+	  ea = ea + C;
+	  res = rd + ea;
+	  goto alu16;
 
-	  ALUOP (1, O_SUB, RD_EA;
-		 ea = -ea;
-		 res = rd + ea);
-	  ALUOP (1, O_NEG, EA;
-		 ea = -ea;
-		 rd = 0;
-		 res = rd + ea);
+	case O (O_ADDX, SL):	/* addx, extended add */
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+	  if (fetch (sd, &code->src, &ea))
+	    goto end;
+	  ea = ea + C;
+	  res = rd + ea;
+	  goto alu32;
 
-	case O (O_ADD, SB):
-	  rd = GET_B_REG (code->dst.reg);
-	  ea = fetch (&code->src);
+	case O (O_SUB, SB):		/* sub.b */
+	  /* Fetch rd and ea.  */
+	  if (fetch (sd, &code->src, &ea) || fetch2 (sd, &code->dst, &rd)) 
+	    goto end;
+	  ea = -ea;
 	  res = rd + ea;
 	  goto alu8;
-	case O (O_ADD, SW):
-	  rd = GET_W_REG (code->dst.reg);
-	  ea = fetch (&code->src);
+
+	case O (O_SUB, SW):		/* sub.w */
+	  /* Fetch rd and ea.  */
+	  if (fetch (sd, &code->src, &ea) || fetch2 (sd, &code->dst, &rd)) 
+	    goto end;
+	  ea = -ea;
 	  res = rd + ea;
 	  goto alu16;
-	case O (O_ADD, SL):
-	  rd = GET_L_REG (code->dst.reg);
-	  ea = fetch (&code->src);
+
+	case O (O_SUB, SL):		/* sub.l */
+	  /* Fetch rd and ea.  */
+	  if (fetch (sd, &code->src, &ea) || fetch2 (sd, &code->dst, &rd)) 
+	    goto end;
+	  ea = -ea;
 	  res = rd + ea;
 	  goto alu32;
 
+	case O (O_NEG, SB):		/* neg.b */
+	  /* Fetch ea.  */
+	  if (fetch2 (sd, &code->src, &ea)) 
+	    goto end;
+	  ea = -ea;
+	  rd = 0;
+	  res = rd + ea;
+	  goto alu8;
 
-	  LOGOP (O_AND, RD_EA;
-		 res = rd & ea);
+	case O (O_NEG, SW):		/* neg.w */
+	  /* Fetch ea.  */
+	  if (fetch2 (sd, &code->src, &ea)) 
+	    goto end;
+	  ea = -ea;
+	  rd = 0;
+	  res = rd + ea;
+	  goto alu16;
 
-	  LOGOP (O_OR, RD_EA;
-		 res = rd | ea);
+	case O (O_NEG, SL):		/* neg.l */
+	  /* Fetch ea.  */
+	  if (fetch2 (sd, &code->src, &ea)) 
+	    goto end;
+	  ea = -ea;
+	  rd = 0;
+	  res = rd + ea;
+	  goto alu32;
 
-	  LOGOP (O_XOR, RD_EA;
-		 res = rd ^ ea);
+	case O (O_ADD, SB):		/* add.b */
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+	  if (fetch (sd, &code->src, &ea))
+	    goto end;
+	  res = rd + ea;
+	  goto alu8;
 
+	case O (O_ADD, SW):		/* add.w */
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+	  if (fetch (sd, &code->src, &ea))
+	    goto end;
+	  res = rd + ea;
+	  goto alu16;
 
-	case O (O_MOV_TO_MEM, SB):
-	  res = GET_B_REG (code->src.reg);
+	case O (O_ADD, SL):		/* add.l */
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+	  if (fetch (sd, &code->src, &ea))
+	    goto end;
+	  res = rd + ea;
+	  goto alu32;
+
+	case O (O_AND, SB):		/* and.b */
+	  /* Fetch rd and ea.  */
+	  if (fetch (sd, &code->src, &ea) || fetch2 (sd, &code->dst, &rd)) 
+	    goto end;
+	  res = rd & ea;
+	  goto log8;
+
+	case O (O_AND, SW):		/* and.w */
+	  /* Fetch rd and ea.  */
+	  if (fetch (sd, &code->src, &ea) || fetch2 (sd, &code->dst, &rd)) 
+	    goto end;
+	  res = rd & ea;
+	  goto log16;
+
+	case O (O_AND, SL):		/* and.l */
+	  /* Fetch rd and ea.  */
+	  if (fetch (sd, &code->src, &ea) || fetch2 (sd, &code->dst, &rd)) 
+	    goto end;
+	  res = rd & ea;
+	  goto log32;
+
+	case O (O_OR, SB):		/* or.b */
+	  /* Fetch rd and ea.  */
+	  if (fetch (sd, &code->src, &ea) || fetch2 (sd, &code->dst, &rd)) 
+	    goto end;
+	  res = rd | ea;
 	  goto log8;
-	case O (O_MOV_TO_MEM, SW):
-	  res = GET_W_REG (code->src.reg);
+
+	case O (O_OR, SW):		/* or.w */
+	  /* Fetch rd and ea.  */
+	  if (fetch (sd, &code->src, &ea) || fetch2 (sd, &code->dst, &rd)) 
+	    goto end;
+	  res = rd | ea;
 	  goto log16;
-	case O (O_MOV_TO_MEM, SL):
-	  res = GET_L_REG (code->src.reg);
+
+	case O (O_OR, SL):		/* or.l */
+	  /* Fetch rd and ea.  */
+	  if (fetch (sd, &code->src, &ea) || fetch2 (sd, &code->dst, &rd)) 
+	    goto end;
+	  res = rd | ea;
 	  goto log32;
 
+	case O (O_XOR, SB):		/* xor.b */
+	  /* Fetch rd and ea.  */
+	  if (fetch (sd, &code->src, &ea) || fetch2 (sd, &code->dst, &rd)) 
+	    goto end;
+	  res = rd ^ ea;
+	  goto log8;
+
+	case O (O_XOR, SW):		/* xor.w */
+	  /* Fetch rd and ea.  */
+	  if (fetch (sd, &code->src, &ea) || fetch2 (sd, &code->dst, &rd)) 
+	    goto end;
+	  res = rd ^ ea;
+	  goto log16;
+
+	case O (O_XOR, SL):		/* xor.l */
+	  /* Fetch rd and ea.  */
+	  if (fetch (sd, &code->src, &ea) || fetch2 (sd, &code->dst, &rd)) 
+	    goto end;
+	  res = rd ^ ea;
+	  goto log32;
 
-	case O (O_MOV_TO_REG, SB):
-	  res = fetch (&code->src);
-	  SET_B_REG (code->dst.reg, res);
+	case O (O_MOV, SB):
+	  if (fetch (sd, &code->src, &res))
+	    goto end;
+	  if (store (sd, &code->dst, res))
+	    goto end;
 	  goto just_flags_log8;
-	case O (O_MOV_TO_REG, SW):
-	  res = fetch (&code->src);
-	  SET_W_REG (code->dst.reg, res);
+	case O (O_MOV, SW):
+	  if (fetch (sd, &code->src, &res))
+	    goto end;
+	  if (store (sd, &code->dst, res))
+	    goto end;
 	  goto just_flags_log16;
-	case O (O_MOV_TO_REG, SL):
-	  res = fetch (&code->src);
-	  SET_L_REG (code->dst.reg, res);
+	case O (O_MOV, SL):
+	  if (fetch (sd, &code->src, &res))
+	    goto end;
+	  if (store (sd, &code->dst, res))
+	    goto end;
 	  goto just_flags_log32;
 
-	case O (O_EEPMOV, SB):
-	case O (O_EEPMOV, SW):
+	case O (O_MOVMD, SB):		/* movsd.b */
+	  ea = GET_W_REG (4);
+	  if (ea == 0)
+	    ea = 0x10000;
+
+	  while (ea--)
+	    {
+	      rd = GET_MEMORY_B (GET_L_REG (5));
+	      SET_MEMORY_B (GET_L_REG (6), rd);
+	      SET_L_REG (5, GET_L_REG (5) + 1);
+	      SET_L_REG (6, GET_L_REG (6) + 1);
+	      SET_W_REG (4, ea);
+	    }
+	  goto next;
+
+	case O (O_MOVMD, SW):		/* movsd.b */
+	  ea = GET_W_REG (4);
+	  if (ea == 0)
+	    ea = 0x10000;
+
+	  while (ea--)
+	    {
+	      rd = GET_MEMORY_W (GET_L_REG (5));
+	      SET_MEMORY_W (GET_L_REG (6), rd);
+	      SET_L_REG (5, GET_L_REG (5) + 2);
+	      SET_L_REG (6, GET_L_REG (6) + 2);
+	      SET_W_REG (4, ea);
+	    }
+	  goto next;
+
+	case O (O_MOVMD, SL):		/* movsd.b */
+	  ea = GET_W_REG (4);
+	  if (ea == 0)
+	    ea = 0x10000;
+
+	  while (ea--)
+	    {
+	      rd = GET_MEMORY_L (GET_L_REG (5));
+	      SET_MEMORY_L (GET_L_REG (6), rd);
+	      SET_L_REG (5, GET_L_REG (5) + 4);
+	      SET_L_REG (6, GET_L_REG (6) + 4);
+	      SET_W_REG (4, ea);
+	    }
+	  goto next;
+
+	case O (O_MOVSD, SB):		/* movsd.b */
+	  /* This instruction implements strncpy, with a conditional branch.
+	     r4 contains n, r5 contains src, and r6 contains dst.
+	     The 16-bit displacement operand is added to the pc
+	     if and only if the end of string is reached before
+	     n bytes are transferred.  */
+
+	  ea = GET_L_REG (4) & 0xffff;
+	  if (ea == 0)
+	    ea = 0x10000;
+
+	  while (ea--)
+	    {
+	      rd = GET_MEMORY_B (GET_L_REG (5));
+	      SET_MEMORY_B (GET_L_REG (6), rd);
+	      SET_L_REG (5, GET_L_REG (5) + 1);
+	      SET_L_REG (6, GET_L_REG (6) + 1);
+	      SET_W_REG (4, ea); 
+	      if (rd == 0)
+		goto condtrue;
+	    }
+	  goto next;
+
+	case O (O_EEPMOV, SB):		/* eepmov.b */
+	case O (O_EEPMOV, SW):		/* eepmov.w */
 	  if (h8300hmode || h8300smode)
 	    {
 	      register unsigned char *_src, *_dst;
 	      unsigned int count = ((code->opcode == O (O_EEPMOV, SW))
-				    ? cpu.regs[R4_REGNUM] & 0xffff
-				    : cpu.regs[R4_REGNUM] & 0xff);
-
-	      _src = (cpu.regs[R5_REGNUM] < memory_size
-		      ? cpu.memory + cpu.regs[R5_REGNUM]
-		      : cpu.eightbit + (cpu.regs[R5_REGNUM] & 0xff));
-	      if ((_src + count) >= (cpu.memory + memory_size))
+				    ? h8_get_reg (sd, R4_REGNUM) & 0xffff
+				    : h8_get_reg (sd, R4_REGNUM) & 0xff);
+
+	      _src = (h8_get_reg (sd, R5_REGNUM) < memory_size
+		      ? h8_get_memory_buf   (sd) + h8_get_reg (sd, R5_REGNUM)
+		      : h8_get_eightbit_buf (sd) + 
+		       (h8_get_reg (sd, R5_REGNUM) & 0xff));
+	      if ((_src + count) >= (h8_get_memory_buf (sd) + memory_size))
 		{
-		  if ((_src + count) >= (cpu.eightbit + 0x100))
+		  if ((_src + count) >= (h8_get_eightbit_buf (sd) + 0x100))
 		    goto illegal;
 		}
-	      _dst = (cpu.regs[R6_REGNUM] < memory_size
-		      ? cpu.memory + cpu.regs[R6_REGNUM]
-		      : cpu.eightbit + (cpu.regs[R6_REGNUM] & 0xff));
-	      if ((_dst + count) >= (cpu.memory + memory_size))
+	      _dst = (h8_get_reg (sd, R6_REGNUM) < memory_size
+		      ? h8_get_memory_buf   (sd) + h8_get_reg (sd, R6_REGNUM)
+		      : h8_get_eightbit_buf (sd) + 
+		       (h8_get_reg (sd, R6_REGNUM) & 0xff));
+
+	      if ((_dst + count) >= (h8_get_memory_buf (sd) + memory_size))
 		{
-		  if ((_dst + count) >= (cpu.eightbit + 0x100))
+		  if ((_dst + count) >= (h8_get_eightbit_buf (sd) + 0x100))
 		    goto illegal;
 		}
 	      memcpy (_dst, _src, count);
 
-	      cpu.regs[R5_REGNUM] += count;
-	      cpu.regs[R6_REGNUM] += count;
-	      cpu.regs[R4_REGNUM] &= ((code->opcode == O (O_EEPMOV, SW))
-				      ? (~0xffff) : (~0xff));
+	      h8_set_reg (sd, R5_REGNUM, h8_get_reg (sd, R5_REGNUM) + count);
+	      h8_set_reg (sd, R6_REGNUM, h8_get_reg (sd, R6_REGNUM) + count);
+	      h8_set_reg (sd, R4_REGNUM, h8_get_reg (sd, R4_REGNUM) &
+			  ((code->opcode == O (O_EEPMOV, SW))
+			  ? (~0xffff) : (~0xff)));
 	      cycles += 2 * count;
 	      goto next;
 	    }
 	  goto illegal;
 
-	case O (O_ADDS, SL):
+	case O (O_ADDS, SL):		/* adds (.l) */
+	  /* FIXME fetch.
+	   * This insn only uses register operands, but still
+	   * it would be cleaner to use fetch and store...  */	  
 	  SET_L_REG (code->dst.reg,
 		     GET_L_REG (code->dst.reg)
 		     + code->src.literal);
 
 	  goto next;
 
-	case O (O_SUBS, SL):
+	case O (O_SUBS, SL):		/* subs (.l) */
+	  /* FIXME fetch.
+	   * This insn only uses register operands, but still
+	   * it would be cleaner to use fetch and store...  */	  
 	  SET_L_REG (code->dst.reg,
 		     GET_L_REG (code->dst.reg)
 		     - code->src.literal);
 	  goto next;
 
-	case O (O_CMP, SB):
-	  rd = fetch (&code->dst);
-	  ea = fetch (&code->src);
+	case O (O_CMP, SB):		/* cmp.b */
+	  if (fetch (sd, &code->dst, &rd))
+	    goto end;
+	  if (fetch (sd, &code->src, &ea))
+	    goto end;
 	  ea = -ea;
 	  res = rd + ea;
 	  goto just_flags_alu8;
 
-	case O (O_CMP, SW):
-	  rd = fetch (&code->dst);
-	  ea = fetch (&code->src);
+	case O (O_CMP, SW):		/* cmp.w */
+	  if (fetch (sd, &code->dst, &rd))
+	    goto end;
+	  if (fetch (sd, &code->src, &ea))
+	    goto end;
 	  ea = -ea;
 	  res = rd + ea;
 	  goto just_flags_alu16;
 
-	case O (O_CMP, SL):
-	  rd = fetch (&code->dst);
-	  ea = fetch (&code->src);
+	case O (O_CMP, SL):		/* cmp.l */
+	  if (fetch (sd, &code->dst, &rd))
+	    goto end;
+	  if (fetch (sd, &code->src, &ea))
+	    goto end;
 	  ea = -ea;
 	  res = rd + ea;
 	  goto just_flags_alu32;
 
-
-	case O (O_DEC, SB):
+	case O (O_DEC, SB):		/* dec.b */
+	  /* FIXME fetch.
+	   * This insn only uses register operands, but still
+	   * it would be cleaner to use fetch and store...  */	  
 	  rd = GET_B_REG (code->src.reg);
 	  ea = -1;
 	  res = rd + ea;
 	  SET_B_REG (code->src.reg, res);
 	  goto just_flags_inc8;
 
-	case O (O_DEC, SW):
+	case O (O_DEC, SW):		/* dec.w */
+	  /* FIXME fetch.
+	   * This insn only uses register operands, but still
+	   * it would be cleaner to use fetch and store...  */	  
 	  rd = GET_W_REG (code->dst.reg);
 	  ea = -code->src.literal;
 	  res = rd + ea;
 	  SET_W_REG (code->dst.reg, res);
 	  goto just_flags_inc16;
 
-	case O (O_DEC, SL):
+	case O (O_DEC, SL):		/* dec.l */
+	  /* FIXME fetch.
+	   * This insn only uses register operands, but still
+	   * it would be cleaner to use fetch and store...  */	  
 	  rd = GET_L_REG (code->dst.reg);
 	  ea = -code->src.literal;
 	  res = rd + ea;
 	  SET_L_REG (code->dst.reg, res);
 	  goto just_flags_inc32;
 
-
-	case O (O_INC, SB):
+	case O (O_INC, SB):		/* inc.b */
+	  /* FIXME fetch.
+	   * This insn only uses register operands, but still
+	   * it would be cleaner to use fetch and store...  */	  
 	  rd = GET_B_REG (code->src.reg);
 	  ea = 1;
 	  res = rd + ea;
 	  SET_B_REG (code->src.reg, res);
 	  goto just_flags_inc8;
 
-	case O (O_INC, SW):
+	case O (O_INC, SW):		/* inc.w */
+	  /* FIXME fetch.
+	   * This insn only uses register operands, but still
+	   * it would be cleaner to use fetch and store...  */	  
 	  rd = GET_W_REG (code->dst.reg);
 	  ea = code->src.literal;
 	  res = rd + ea;
 	  SET_W_REG (code->dst.reg, res);
 	  goto just_flags_inc16;
 
-	case O (O_INC, SL):
+	case O (O_INC, SL):		/* inc.l */
+	  /* FIXME fetch.
+	   * This insn only uses register operands, but still
+	   * it would be cleaner to use fetch and store...  */	  
 	  rd = GET_L_REG (code->dst.reg);
 	  ea = code->src.literal;
 	  res = rd + ea;
 	  SET_L_REG (code->dst.reg, res);
 	  goto just_flags_inc32;
 
-#define GET_CCR(x) BUILDSR();x = cpu.ccr
-#define GET_EXR(x) BUILDEXR ();x = cpu.exr
+	case O (O_LDC, SB):		/* ldc.b */
+	  if (fetch (sd, &code->src, &res))
+	    goto end;
+	  goto setc;
 
-	case O (O_LDC, SB):
-	case O (O_LDC, SW):
-	  res = fetch (&code->src);
+	case O (O_LDC, SW):		/* ldc.w */
+	  if (fetch (sd, &code->src, &res))
+	    goto end;
+
+	  /* Word operand, value from MSB, must be shifted.  */
+	  res >>= 8;
 	  goto setc;
-	case O (O_STC, SB):
-	case O (O_STC, SW):
-	  if (code->src.type == OP_CCR)
+
+	case O (O_LDC, SL):		/* ldc.l */
+	  if (fetch (sd, &code->src, &res))
+	    goto end;
+	  switch (code->dst.type) {
+	  case X (OP_SBR, SL):
+	    h8_set_sbr (sd, res);
+	    break;
+	  case X (OP_VBR, SL):
+	    h8_set_vbr (sd, res);
+	    break;
+	  default:
+	    goto illegal;
+	  }
+	  goto next;
+
+	case O (O_STC, SW):		/* stc.w */
+	case O (O_STC, SB):		/* stc.b */
+	  if (code->src.type == X (OP_CCR, SB))
 	    {
-	      GET_CCR (res);
+	      BUILDSR (sd);
+	      res = h8_get_ccr (sd);
 	    }
-	  else if (code->src.type == OP_EXR && h8300smode)
+	  else if (code->src.type == X (OP_EXR, SB) && h8300smode)
 	    {
-	      GET_EXR (res);
+	      if (h8300smode)
+		h8_set_exr (sd, (trace << 7) | intMask);
+	      res = h8_get_exr (sd);
 	    }
 	  else
 	    goto illegal;
-	  store (&code->dst, res);
+
+	  /* Word operand, value to MSB, must be shifted.  */
+	  if (code->opcode == X (O_STC, SW))
+	    res <<= 8;
+	  if (store (sd, &code->dst, res))
+	    goto end;
+	  goto next;
+	case O (O_STC, SL):		/* stc.l */
+	  switch (code->src.type) {
+	  case X (OP_SBR, SL):
+	    res = h8_get_sbr (sd);
+	    break;
+	  case X (OP_VBR, SL):
+	    res = h8_get_vbr (sd);
+	    break;
+	  default:
+	    goto illegal;
+	  }
+	  if (store (sd, &code->dst, res))
+	    goto end;
 	  goto next;
 
-	case O (O_ANDC, SB):
-	  if (code->dst.type == OP_CCR)
+	case O (O_ANDC, SB):		/* andc.b */
+	  if (code->dst.type == X (OP_CCR, SB))
 	    {
-	      GET_CCR (rd);
+	      BUILDSR (sd);
+	      rd = h8_get_ccr (sd);
 	    }
-	  else if (code->dst.type == OP_EXR && h8300smode)
+	  else if (code->dst.type == X (OP_EXR, SB) && h8300smode)
 	    {
-	      GET_EXR (rd);
+	      if (h8300smode)
+		h8_set_exr (sd, (trace << 7) | intMask);
+	      res = h8_get_exr (sd);
 	    }
 	  else
 	    goto illegal;
@@ -1317,14 +2494,17 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	  res = rd & ea;
 	  goto setc;
 
-	case O (O_ORC, SB):
-	  if (code->dst.type == OP_CCR)
+	case O (O_ORC, SB):		/* orc.b */
+	  if (code->dst.type == X (OP_CCR, SB))
 	    {
-	      GET_CCR (rd);
+	      BUILDSR (sd);
+	      rd = h8_get_ccr (sd);
 	    }
-	  else if (code->dst.type == OP_EXR && h8300smode)
+	  else if (code->dst.type == X (OP_EXR, SB) && h8300smode)
 	    {
-	      GET_EXR (rd);
+	      if (h8300smode)
+		h8_set_exr (sd, (trace << 7) | intMask);
+	      rd = h8_get_exr (sd);
 	    }
 	  else
 	    goto illegal;
@@ -1332,14 +2512,17 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	  res = rd | ea;
 	  goto setc;
 
-	case O (O_XORC, SB):
-	  if (code->dst.type == OP_CCR)
+	case O (O_XORC, SB):		/* xorc.b */
+	  if (code->dst.type == X (OP_CCR, SB))
 	    {
-	      GET_CCR (rd);
+	      BUILDSR (sd);
+	      rd = h8_get_ccr (sd);
 	    }
-	  else if (code->dst.type == OP_EXR && h8300smode)
+	  else if (code->dst.type == X (OP_EXR, SB) && h8300smode)
 	    {
-	      GET_EXR (rd);
+	      if (h8300smode)
+		h8_set_exr (sd, (trace << 7) | intMask);
+	      rd = h8_get_exr (sd);
 	    }
 	  else
 	    goto illegal;
@@ -1347,79 +2530,139 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	  res = rd ^ ea;
 	  goto setc;
 
+	case O (O_BRAS, SB):		/* bra/s  */
+	  /* This is basically an ordinary branch, with a delay slot.  */
+	  if (fetch (sd, &code->src, &res))
+	    goto end;
+
+	  if ((res & 1) == 0)
+	    goto illegal;
+
+	  res -= 1;
+
+	  /* Execution continues at next instruction, but
+	     delayed_branch is set up for next cycle.  */
+	  h8_set_delayed_branch (sd, code->next_pc + res);
+	  pc = code->next_pc;
+	  goto end;
+
+	case O (O_BRAB, SB):		/* bra rd.b */
+	case O (O_BRAW, SW):		/* bra rd.w */
+	case O (O_BRAL, SL):		/* bra erd.l */
+	  if (fetch (sd, &code->src, &rd))
+	    goto end;
+	  switch (OP_SIZE (code->opcode)) {
+	  case SB:	rd &= 0xff;		break;
+	  case SW:	rd &= 0xffff;		break;
+	  case SL:	rd &= 0xffffffff;	break;
+	  }
+	  pc = code->next_pc + rd;
+	  goto end;
+
+	case O (O_BRABC, SB):		/* bra/bc, branch if bit clear */
+	case O (O_BRABS, SB):		/* bra/bs, branch if bit set   */
+	case O (O_BSRBC, SB):		/* bsr/bc, call   if bit clear */
+	case O (O_BSRBS, SB):		/* bsr/bs, call   if bit set   */
+	  if (fetch (sd, &code->dst, &rd) ||
+	      fetch (sd, &code->src, &bit))
+	    goto end;
+
+	  if (code->opcode == O (O_BRABC, SB) || /* branch if clear */
+	      code->opcode == O (O_BSRBC, SB))	 /* call   if clear */
+	    {
+	      if ((rd & (1 << bit)))		/* no branch */
+		goto next;
+	    }
+	  else					/* branch/call if set */
+	    {
+	      if (!(rd & (1 << bit)))		/* no branch */
+		goto next;
+	    }
+
+	  if (fetch (sd, &code->op3, &res))	/* branch */
+	    goto end;
+	  pc = code->next_pc + res;
+
+	  if (code->opcode == O (O_BRABC, SB) ||
+	      code->opcode == O (O_BRABS, SB))	/* branch */
+	    goto end;
+	  else					/* call   */
+	    goto call;
 
-	case O (O_BRA, SB):
+	case O (O_BRA, SN):
+	case O (O_BRA, SL):
+	case O (O_BRA, SW):
+	case O (O_BRA, SB):		/* bra, branch always */
 	  if (1)
 	    goto condtrue;
 	  goto next;
 
-	case O (O_BRN, SB):
+	case O (O_BRN, SB):		/* brn, ;-/  branch never? */
 	  if (0)
 	    goto condtrue;
 	  goto next;
 
-	case O (O_BHI, SB):
+	case O (O_BHI, SB):		/* bhi */
 	  if ((C || Z) == 0)
 	    goto condtrue;
 	  goto next;
 
 
-	case O (O_BLS, SB):
+	case O (O_BLS, SB):		/* bls */
 	  if ((C || Z))
 	    goto condtrue;
 	  goto next;
 
-	case O (O_BCS, SB):
+	case O (O_BCS, SB):		/* bcs, branch if carry set */
 	  if ((C == 1))
 	    goto condtrue;
 	  goto next;
 
-	case O (O_BCC, SB):
+	case O (O_BCC, SB):		/* bcc, branch if carry clear */
 	  if ((C == 0))
 	    goto condtrue;
 	  goto next;
 
-	case O (O_BEQ, SB):
+	case O (O_BEQ, SB):		/* beq, branch if zero set */
 	  if (Z)
 	    goto condtrue;
 	  goto next;
-	case O (O_BGT, SB):
+	case O (O_BGT, SB):		/* bgt */
 	  if (((Z || (N ^ V)) == 0))
 	    goto condtrue;
 	  goto next;
 
-
-	case O (O_BLE, SB):
+	case O (O_BLE, SB):		/* ble */
 	  if (((Z || (N ^ V)) == 1))
 	    goto condtrue;
 	  goto next;
 
-	case O (O_BGE, SB):
+	case O (O_BGE, SB):		/* bge */
 	  if ((N ^ V) == 0)
 	    goto condtrue;
 	  goto next;
-	case O (O_BLT, SB):
+	case O (O_BLT, SB):		/* blt */
 	  if ((N ^ V))
 	    goto condtrue;
 	  goto next;
-	case O (O_BMI, SB):
+	case O (O_BMI, SB):		/* bmi */
 	  if ((N))
 	    goto condtrue;
 	  goto next;
-	case O (O_BNE, SB):
+	case O (O_BNE, SB):		/* bne, branch if zero clear */
 	  if ((Z == 0))
 	    goto condtrue;
 	  goto next;
 
-	case O (O_BPL, SB):
+	case O (O_BPL, SB):		/* bpl */
 	  if (N == 0)
 	    goto condtrue;
 	  goto next;
-	case O (O_BVC, SB):
+	case O (O_BVC, SB):		/* bvc */
 	  if ((V == 0))
 	    goto condtrue;
 	  goto next;
-	case O (O_BVS, SB):
+	case O (O_BVS, SB):		/* bvs */
 	  if ((V == 1))
 	    goto condtrue;
 	  goto next;
@@ -1451,10 +2694,10 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	    /* Set the address of 256 free locations where command line is
 	       stored.  */
 	    addr_cmdline = cmdline_location();
-	    cpu.regs[0] = addr_cmdline;
+	    h8_set_reg (sd, 0, addr_cmdline);
 
 	    /* Counting the no. of commandline arguments.  */
-	    for (i = 0; ptr_command_line[i] != NULL; i++)
+	    for (i = 0; h8_get_cmdline_arg (sd, i) != NULL; i++)
 	      continue;
 
 	    /* No. of arguments in the command line.  */
@@ -1484,7 +2727,7 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 		ind_arg_len = 0;
 
 		/* The size of the commandline argument.  */
-		ind_arg_len = (strlen (ptr_command_line[i]) + 1);
+		ind_arg_len = strlen (h8_get_cmdline_arg (sd, i) + 1);
 
 		/* The total size of the command line string.  */
 		size_cmdline += ind_arg_len;
@@ -1495,7 +2738,7 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 		   given may behave unpredictably.  */
 		if (size_cmdline >= 256)
 		  {
-		    cpu.regs[0] = 0;
+		    h8_set_reg (sd, 0, 0);
 		    goto next;
 		  }
 		else
@@ -1507,7 +2750,7 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 		      {
 			SET_MEMORY_B ((current_location +
 				       (sizeof (char) * j)),
-				      *(ptr_command_line[i] + 
+				      *(h8_get_cmdline_arg (sd, i) + 
 				       sizeof (char) * j));
 		      }
 
@@ -1518,7 +2761,7 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	      }
 
 	    /* This is the original position of the stack pointer.  */
-	    old_sp = cpu.regs[7];
+	    old_sp = h8_get_reg (sd, SP_REGNUM);
 
 	    /* We need space from the stack to store the pointers to argvs.  */
 	    /* As we will infringe on the stack, we need to shift the stack
@@ -1568,16 +2811,16 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	    free (argv_ptrs);
 	    for (i = 0; i <= no_of_args; i++)
 	      {
-		free (ptr_command_line[i]);
+		free (h8_get_cmdline_arg (sd, i));
 	      }
-	    free (ptr_command_line);
+	    free (h8_get_command_line (sd));
 
 	    /* The no. of argv arguments are returned in Reg 0.  */
-	    cpu.regs[0] = no_of_args;
+	    h8_set_reg (sd, 0, no_of_args);
 	    /* The Pointer to argv in Register 1.  */
-	    cpu.regs[1] = new_sp;
+	    h8_set_reg (sd, 1, new_sp);
 	    /* Setting the stack pointer to the new value.  */
-	    cpu.regs[7] = new_sp;
+	    h8_set_reg (sd, SP_REGNUM, new_sp);
 	  }
 	  goto next;
 
@@ -1592,21 +2835,21 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	    int i;		/* Loop counter */
 	    int filename_ptr;	/* Pointer to filename in cpu memory.  */
 
-	    /* Setting filename_ptr to first argument of open.  */
-	    filename_ptr = h8300hmode ? GET_L_REG (0) : GET_W_REG (0);
-
-	    /* Trying to get mode.  */
-	    if (h8300hmode || h8300smode)
+	    /* Setting filename_ptr to first argument of open,  */
+	    /* and trying to get mode.  */
+	    if (h8300sxmode || h8300hmode || h8300smode)
 	      {
-		mode = GET_MEMORY_L (cpu.regs[7] + 4);
+		filename_ptr = GET_L_REG (0);
+		mode = GET_MEMORY_L (h8_get_reg (sd, SP_REGNUM) + 4);
 	      }
 	    else
 	      {
-		mode = GET_MEMORY_W (cpu.regs[7] + 2);
+		filename_ptr = GET_W_REG (0);
+		mode = GET_MEMORY_W (h8_get_reg (sd, SP_REGNUM) + 2);
 	      }
 
 	    /* Trying to find the length of the filename.  */
-	    temp_char = GET_MEMORY_B (cpu.regs[0]);
+	    temp_char = GET_MEMORY_B (h8_get_reg (sd, 0));
 
 	    len = 1;
 	    while (temp_char != '\0')
@@ -1629,7 +2872,7 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	    open_return = sim_callback->open (sim_callback, filename, mode);
 
 	    /* Return value in register 0.  */
-	    cpu.regs[0] = open_return;
+	    h8_set_reg (sd, 0, open_return);
 
 	    /* Freeing memory used for filename. */
 	    free (filename);
@@ -1657,12 +2900,12 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	    /* The characters read are stored in cpu memory.  */
 	    for (i = 0; i < buf_size; i++)
 	      {
-		SET_MEMORY_B ((cpu.regs[1] + (sizeof (char) * i)),
+		SET_MEMORY_B ((h8_get_reg (sd, 1) + (sizeof (char) * i)),
 			      *(char_ptr + (sizeof (char) * i)));
 	      }
 
 	    /* Return value in Register 0.  */
-	    cpu.regs[0] = read_return;
+	    h8_set_reg (sd, 0, read_return);
 
 	    /* Freeing memory used as buffer.  */
 	    free (char_ptr);
@@ -1698,7 +2941,7 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	    write_return = sim_callback->write (sim_callback, fd, ptr, len);
 
 	    /* Return value in Register 0.  */
-	    cpu.regs[0] = write_return;
+	    h8_set_reg (sd, 0, write_return);
 
 	    /* Freeing memory used as buffer.  */
 	    free (ptr);
@@ -1721,7 +2964,7 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	      sim_callback->lseek (sim_callback, fd, offset, origin);
 
 	    /* Return value in register 0.  */
-	    cpu.regs[0] = lseek_return;
+	    h8_set_reg (sd, 0, lseek_return);
 	  }
 	  goto next;
 
@@ -1736,7 +2979,7 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	    close_return = sim_callback->close (sim_callback, fd);
 
 	    /* Return value in register 0.  */
-	    cpu.regs[0] = close_return;
+	    h8_set_reg (sd, 0, close_return);
 	  }
 	  goto next;
 
@@ -1783,7 +3026,7 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	    SET_MEMORY_L (stat_ptr, stat_rec.st_ctime);
 
 	    /* Return value in register 0.  */
-	    cpu.regs[0] = fstat_return;
+	    h8_set_reg (sd, 0, fstat_return);
 	  }
 	  goto next;
 
@@ -1803,7 +3046,7 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	    filename_ptr = h8300hmode ? GET_L_REG (0) : GET_W_REG (0);
 
 	    /* Trying to find the length of the filename.  */
-	    temp_char = GET_MEMORY_B (cpu.regs[0]);
+	    temp_char = GET_MEMORY_B (h8_get_reg (sd, 0));
 
 	    len = 1;
 	    while (temp_char != '\0')
@@ -1823,7 +3066,7 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	      }
 
 	    /* Setting stat_ptr to second argument of stat.  */
-	    /* stat_ptr = cpu.regs[1]; */
+	    /* stat_ptr = h8_get_reg (sd, 1); */
 	    stat_ptr = h8300hmode ? GET_L_REG (1) : GET_W_REG (1);
 
 	    /* Callback stat and return.  */
@@ -1832,10 +3075,10 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 
 	    /* Have stat_ptr point to starting of stat_rec.  */
 	    temp_stat_ptr = (char *) (&stat_rec);
-
+ 
 	    /* Freeing memory used for filename.  */
 	    free (filename);
-
+ 
 	    /* Setting up the stat structure returned.  */
 	    SET_MEMORY_W (stat_ptr, stat_rec.st_dev);
 	    stat_ptr += 2;
@@ -1858,52 +3101,383 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	    SET_MEMORY_L (stat_ptr, stat_rec.st_mtime);
 	    stat_ptr += 8;
 	    SET_MEMORY_L (stat_ptr, stat_rec.st_ctime);
-
+ 
 	    /* Return value in register 0.  */
-	    cpu.regs[0] = stat_return;
+	    h8_set_reg (sd, 0, stat_return);
 	  }
 	  goto next;
 	  /* End of system call processing.  */
 
-	  ONOT (O_NOT, rd = ~rd; v = 0;);
-	  OSHIFTS (O_SHLL,
-		   c = rd & hm; v = 0; rd <<= 1,
-		   c = rd & (hm >> 1); v = 0; rd <<= 2);
-	  OSHIFTS (O_SHLR,
-		   c = rd & 1; v = 0; rd = (unsigned int) rd >> 1,
-		   c = rd & 2; v = 0; rd = (unsigned int) rd >> 2);
-	  OSHIFTS (O_SHAL,
-		   c = rd & hm; v = (rd & hm) != ((rd & (hm >> 1)) << 1); rd <<= 1,
-		   c = rd & (hm >> 1); v = (rd & (hm >> 1)) != ((rd & (hm >> 2)) << 2); rd <<= 2);
-	  OSHIFTS (O_SHAR,
-		   t = rd & hm; c = rd & 1; v = 0; rd >>= 1; rd |= t,
-		   t = rd & hm; c = rd & 2; v = 0; rd >>= 2; rd |= t | t >> 1);
-	  OSHIFTS (O_ROTL,
-		   c = rd & hm; v = 0; rd <<= 1; rd |= C,
-		   c = rd & hm; v = 0; rd <<= 1; rd |= C; c = rd & hm; rd <<= 1; rd |= C);
-	  OSHIFTS (O_ROTR,
-		   c = rd & 1; v = 0; rd = (unsigned int) rd >> 1; if (c) rd |= hm,
-		   c = rd & 1; v = 0; rd = (unsigned int) rd >> 1; if (c) rd |= hm; c = rd & 1; rd = (unsigned int) rd >> 1; if (c) rd |= hm);
-	  OSHIFTS (O_ROTXL,
-		   t = rd & hm; rd <<= 1; rd |= C; c = t; v = 0,
-		   t = rd & hm; rd <<= 1; rd |= C; c = t; v = 0; t = rd & hm; rd <<= 1; rd |= C; c = t);
-	  OSHIFTS (O_ROTXR,
-		   t = rd & 1; rd = (unsigned int) rd >> 1; if (C) rd |= hm; c = t; v = 0,
-		   t = rd & 1; rd = (unsigned int) rd >> 1; if (C) rd |= hm; c = t; v = 0; t = rd & 1; rd = (unsigned int) rd >> 1; if (C) rd |= hm; c = t);
-
-	case O (O_JMP, SB):
-	  {
-	    pc = fetch (&code->src);
+	case O (O_NOT, SB):		/* not.b */
+	  if (fetch2 (sd, &code->src, &rd))
+	    goto end;
+	  rd = ~rd; 
+	  v = 0;
+	  goto shift8;
+
+	case O (O_NOT, SW):		/* not.w */
+	  if (fetch2 (sd, &code->src, &rd))
+	    goto end;
+	  rd = ~rd; 
+	  v = 0;
+	  goto shift16;
+
+	case O (O_NOT, SL):		/* not.l */
+	  if (fetch2 (sd, &code->src, &rd))
+	    goto end;
+	  rd = ~rd; 
+	  v = 0;
+	  goto shift32;
+
+	case O (O_SHLL, SB):	/* shll.b */
+	case O (O_SHLR, SB):	/* shlr.b */
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+
+	  if (code->src.type == X (OP_IMM, SB))
+	    fetch (sd, &code->src, &ea);
+	  else
+	    ea = 1;
+
+	  if (code->opcode == O (O_SHLL, SB))
+	    {
+	      v = (ea > 8);
+	      c = rd & (0x80 >> (ea - 1));
+	      rd <<= ea;
+	    }
+	  else
+	    {
+	      v = 0;
+	      c = rd & (1 << (ea - 1));
+	      rd = (unsigned char) rd >> ea;
+	    }
+	  goto shift8;
+
+	case O (O_SHLL, SW):	/* shll.w */
+	case O (O_SHLR, SW):	/* shlr.w */
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+
+	  if (code->src.type == X (OP_IMM, SW))
+	    fetch (sd, &code->src, &ea);
+	  else
+	    ea = 1;
+
+	  if (code->opcode == O (O_SHLL, SW))
+	    {
+	      v = (ea > 16);
+	      c = rd & (0x8000 >> (ea - 1));
+	      rd <<= ea;
+	    }
+	  else
+	    {
+	      v = 0;
+	      c = rd & (1 << (ea - 1));
+	      rd = (unsigned short) rd >> ea;
+	    }
+	  goto shift16;
+
+	case O (O_SHLL, SL):	/* shll.l */
+	case O (O_SHLR, SL):	/* shlr.l */
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+
+	  if (code->src.type == X (OP_IMM, SL))
+	    fetch (sd, &code->src, &ea);
+	  else
+	    ea = 1;
+
+	  if (code->opcode == O (O_SHLL, SL))
+	    {
+	      v = (ea > 32);
+	      c = rd & (0x80000000 >> (ea - 1));
+	      rd <<= ea;
+	    }
+	  else
+	    {
+	      v = 0;
+	      c = rd & (1 << (ea - 1));
+	      rd = (unsigned int) rd >> ea;
+	    }
+	  goto shift32;
+
+	case O (O_SHAL, SB):
+	case O (O_SHAR, SB):
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+
+	  if (code->src.type == X (OP_IMM, SB))
+	    fetch (sd, &code->src, &ea);
+	  else
+	    ea = 1;
+
+	  if (code->opcode == O (O_SHAL, SB))
+	    {
+	      c = rd & (0x80 >> (ea - 1));
+	      res = rd >> (7 - ea);
+	      v = ((res & 1) && !(res & 2)) 
+		|| (!(res & 1) && (res & 2));
+	      rd <<= ea;
+	    }
+	  else
+	    {
+	      c = rd & (1 << (ea - 1));
+	      v = 0;
+	      rd = ((signed char) rd) >> ea;
+	    }
+	  goto shift8;
+
+	case O (O_SHAL, SW):
+	case O (O_SHAR, SW):
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+
+	  if (code->src.type == X (OP_IMM, SW))
+	    fetch (sd, &code->src, &ea);
+	  else
+	    ea = 1;
+
+	  if (code->opcode == O (O_SHAL, SW))
+	    {
+	      c = rd & (0x8000 >> (ea - 1));
+	      res = rd >> (15 - ea);
+	      v = ((res & 1) && !(res & 2)) 
+		|| (!(res & 1) && (res & 2));
+	      rd <<= ea;
+	    }
+	  else
+	    {
+	      c = rd & (1 << (ea - 1));
+	      v = 0;
+	      rd = ((signed short) rd) >> ea;
+	    }
+	  goto shift16;
+
+	case O (O_SHAL, SL):
+	case O (O_SHAR, SL):
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+
+	  if (code->src.type == X (OP_IMM, SL))
+	    fetch (sd, &code->src, &ea);
+	  else
+	    ea = 1;
+
+	  if (code->opcode == O (O_SHAL, SL))
+	    {
+	      c = rd & (0x80000000 >> (ea - 1));
+	      res = rd >> (31 - ea);
+	      v = ((res & 1) && !(res & 2)) 
+		|| (!(res & 1) && (res & 2));
+	      rd <<= ea;
+	    }
+	  else
+	    {
+	      c = rd & (1 << (ea - 1));
+	      v = 0;
+	      rd = ((signed int) rd) >> ea;
+	    }
+	  goto shift32;
+
+	case O (O_ROTL, SB):
+	case O (O_ROTR, SB):
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+
+	  if (code->src.type == X (OP_IMM, SB))
+	    fetch (sd, &code->src, &ea);
+	  else
+	    ea = 1;
+
+	  while (ea--)
+	    if (code->opcode == O (O_ROTL, SB))
+	      {
+		c = rd & 0x80;
+		rd <<= 1;
+		if (c)
+		  rd |= 1;
+	      }
+	    else
+	      {
+		c = rd & 1;
+		rd = ((unsigned char) rd) >> 1;
+		if (c)
+		  rd |= 0x80;
+	      }
+
+	  v = 0;
+	  goto shift8;
+
+	case O (O_ROTL, SW):
+	case O (O_ROTR, SW):
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+
+	  if (code->src.type == X (OP_IMM, SW))
+	    fetch (sd, &code->src, &ea);
+	  else
+	    ea = 1;
+
+	  while (ea--)
+	    if (code->opcode == O (O_ROTL, SW))
+	      {
+		c = rd & 0x8000;
+		rd <<= 1;
+		if (c)
+		  rd |= 1;
+	      }
+	    else
+	      {
+		c = rd & 1;
+		rd = ((unsigned short) rd) >> 1;
+		if (c)
+		  rd |= 0x8000;
+	      }
+
+	  v = 0;
+	  goto shift16;
+
+	case O (O_ROTL, SL):
+	case O (O_ROTR, SL):
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+
+	  if (code->src.type == X (OP_IMM, SL))
+	    fetch (sd, &code->src, &ea);
+	  else
+	    ea = 1;
+
+	  while (ea--)
+	    if (code->opcode == O (O_ROTL, SL))
+	      {
+		c = rd & 0x80000000;
+		rd <<= 1;
+		if (c)
+		  rd |= 1;
+	      }
+	    else
+	      {
+		c = rd & 1;
+		rd = ((unsigned int) rd) >> 1;
+		if (c)
+		  rd |= 0x80000000;
+	      }
+
+	  v = 0;
+	  goto shift32;
+
+	case O (O_ROTXL, SB):
+	case O (O_ROTXR, SB):
+	  if (fetch2 (sd, &code->dst, &rd))
 	    goto end;
 
+	  if (code->src.type == X (OP_IMM, SB))
+	    fetch (sd, &code->src, &ea);
+	  else
+	    ea = 1;
+
+	  while (ea--)
+	    if (code->opcode == O (O_ROTXL, SB))
+	      {
+		res = rd & 0x80;
+		rd <<= 1;
+		if (C)
+		  rd |= 1;
+		c = res;
+	      }
+	    else
+	      {
+		res = rd & 1;
+		rd = ((unsigned char) rd) >> 1;
+		if (C)
+		  rd |= 0x80;
+		c = res;
+	      }
+
+	  v = 0;
+	  goto shift8;
+
+	case O (O_ROTXL, SW):
+	case O (O_ROTXR, SW):
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+
+	  if (code->src.type == X (OP_IMM, SW))
+	    fetch (sd, &code->src, &ea);
+	  else
+	    ea = 1;
+
+	  while (ea--)
+	    if (code->opcode == O (O_ROTXL, SW))
+	      {
+		res = rd & 0x8000;
+		rd <<= 1;
+		if (C)
+		  rd |= 1;
+		c = res;
+	      }
+	    else
+	      {
+		res = rd & 1;
+		rd = ((unsigned short) rd) >> 1;
+		if (C)
+		  rd |= 0x8000;
+		c = res;
+	      }
+
+	  v = 0;
+	  goto shift16;
+
+	case O (O_ROTXL, SL):
+	case O (O_ROTXR, SL):
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+
+	  if (code->src.type == X (OP_IMM, SL))
+	    fetch (sd, &code->src, &ea);
+	  else
+	    ea = 1;
+
+	  while (ea--)
+	    if (code->opcode == O (O_ROTXL, SL))
+	      {
+		res = rd & 0x80000000;
+		rd <<= 1;
+		if (C)
+		  rd |= 1;
+		c = res;
+	      }
+	    else
+	      {
+		res = rd & 1;
+		rd = ((unsigned int) rd) >> 1;
+		if (C)
+		  rd |= 0x80000000;
+		c = res;
+	      }
+
+	  v = 0;
+	  goto shift32;
+
+        case O (O_JMP, SN):
+        case O (O_JMP, SL):
+        case O (O_JMP, SB):		/* jmp */
+        case O (O_JMP, SW):
+	  {
+	    fetch (sd, &code->src, &pc);
+	    goto end;
 	  }
 
-	case O (O_JSR, SB):
+	case O (O_JSR, SN):
+	case O (O_JSR, SL):
+	case O (O_JSR, SB):		/* jsr, jump to subroutine */
+	case O (O_JSR, SW):
 	  {
 	    int tmp;
-	    pc = fetch (&code->src);
+	    if (fetch (sd, &code->src, &pc))
+	      goto end;
 	  call:
-	    tmp = cpu.regs[7];
+	    tmp = h8_get_reg (sd, SP_REGNUM);
 
 	    if (h8300hmode)
 	      {
@@ -1915,19 +3489,24 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 		tmp -= 2;
 		SET_MEMORY_W (tmp, code->next_pc);
 	      }
-	    cpu.regs[7] = tmp;
+	    h8_set_reg (sd, SP_REGNUM, tmp);
 
 	    goto end;
 	  }
-	case O (O_BSR, SB):
-	  pc = code->src.literal;
+
+	case O (O_BSR, SW):
+	case O (O_BSR, SL):
+	case O (O_BSR, SB):		/* bsr, branch to subroutine */
+	  if (fetch (sd, &code->src, &res))
+	    goto end;
+	  pc = code->next_pc + res;
 	  goto call;
 
-	case O (O_RTS, SN):
+	case O (O_RTS, SN):		/* rts, return from subroutine */
 	  {
 	    int tmp;
 
-	    tmp = cpu.regs[7];
+	    tmp = h8_get_reg (sd, SP_REGNUM);
 
 	    if (h8300hmode)
 	      {
@@ -1940,67 +3519,386 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 		tmp += 2;
 	      }
 
-	    cpu.regs[7] = tmp;
+	    h8_set_reg (sd, SP_REGNUM, tmp);
 	    goto end;
 	  }
 
-	case O (O_ILL, SB):
-	  cpu.state = SIM_STATE_STOPPED;
-	  cpu.exception = SIGILL;
+	case O (O_ILL, SB):		/* illegal */
+	  sim_engine_set_run_state (sd, sim_stopped, SIGILL);
 	  goto end;
-	case O (O_SLEEP, SN):
-	  /* FIXME: Doesn't this break for breakpoints when r0
-	     contains just the right (er, wrong) value?  */
-	  cpu.state = SIM_STATE_STOPPED;
-	  /* The format of r0 is defined by target newlib.  Expand
-             the macros here instead of looking for .../sys/wait.h.  */
-#define SIM_WIFEXITED(v) (((v) & 0xff) == 0)
-#define SIM_WIFSIGNALED(v) (((v) & 0x7f) > 0 && (((v) & 0x7f) < 0x7f))
-  	  if (! SIM_WIFEXITED (cpu.regs[0]) && SIM_WIFSIGNALED (cpu.regs[0]))
-	    cpu.exception = SIGILL;
+
+	case O (O_SLEEP, SN):		/* sleep */
+	  /* Check for magic numbers in r1 and r2.  */
+	  if ((h8_get_reg (sd, R1_REGNUM) & 0xffff) == LIBC_EXIT_MAGIC1 &&
+	      (h8_get_reg (sd, R2_REGNUM) & 0xffff) == LIBC_EXIT_MAGIC2 &&
+	      SIM_WIFEXITED (h8_get_reg (sd, 0)))
+	    {
+	      /* This trap comes from _exit, not from gdb.  */
+	      sim_engine_set_run_state (sd, sim_exited, 
+					SIM_WEXITSTATUS (h8_get_reg (sd, 0)));
+	    }
 	  else
-	    cpu.exception = SIGTRAP;
+	    {
+	      /* Treat it as a sigtrap.  */
+	      sim_engine_set_run_state (sd, sim_stopped, SIGTRAP);
+	    }
 	  goto end;
+
 	case O (O_BPT, SN):
-	  cpu.state = SIM_STATE_STOPPED;
-	  cpu.exception = SIGTRAP;
+	  sim_engine_set_run_state (sd, sim_stopped, SIGTRAP);
 	  goto end;
 
-	  OBITOP (O_BNOT, 1, 1, ea ^= m);
-	  OBITOP (O_BTST, 1, 0, nz = ea & m);
-	  OBITOP (O_BCLR, 1, 1, ea &= ~m);
-	  OBITOP (O_BSET, 1, 1, ea |= m);
-	  OBITOP (O_BLD, 1, 0, c = ea & m);
-	  OBITOP (O_BILD, 1, 0, c = !(ea & m));
+	case O (O_BSETEQ, SB):
+	  if (Z)
+	    goto bset;
+	  goto next;
+
+	case O (O_BSETNE, SB):
+	  if (!Z)
+	    goto bset;
+	  goto next;
+
+	case O (O_BCLREQ, SB):
+	  if (Z)
+	    goto bclr;
+	  goto next;
+
+	case O (O_BCLRNE, SB):
+	  if (!Z)
+	    goto bclr;
+	  goto next;
+
+	  OBITOP (O_BNOT, 1, 1, ea ^= m);		/* bnot */
+	  OBITOP (O_BTST, 1, 0, nz = ea & m);		/* btst */
+	bset:
+	  OBITOP (O_BSET, 1, 1, ea |= m);		/* bset */
+	bclr:
+	  OBITOP (O_BCLR, 1, 1, ea &= ~m);		/* bclr */
+	  OBITOP (O_BLD, 1, 0, c = ea & m);		/* bld  */
+	  OBITOP (O_BILD, 1, 0, c = !(ea & m));		/* bild */
 	  OBITOP (O_BST, 1, 1, ea &= ~m;
-		  if (C) ea |= m);
+		  if (C) ea |= m);			/* bst  */
 	  OBITOP (O_BIST, 1, 1, ea &= ~m;
-		  if (!C) ea |= m);
-	  OBITOP (O_BAND, 1, 0, c = (ea & m) && C);
-	  OBITOP (O_BIAND, 1, 0, c = !(ea & m) && C);
-	  OBITOP (O_BOR, 1, 0, c = (ea & m) || C);
-	  OBITOP (O_BIOR, 1, 0, c = !(ea & m) || C);
-	  OBITOP (O_BXOR, 1, 0, c = ((ea & m) != 0) != C);
-	  OBITOP (O_BIXOR, 1, 0, c = !(ea & m) != C);
-
-#define MOP(bsize, signed)			\
-  mop (code, bsize, signed);			\
-  goto next;
-
-	case O (O_MULS, SB):
-	  MOP (1, 1);
-	  break;
-	case O (O_MULS, SW):
-	  MOP (0, 1);
-	  break;
-	case O (O_MULU, SB):
-	  MOP (1, 0);
-	  break;
-	case O (O_MULU, SW):
-	  MOP (0, 0);
-	  break;
+		  if (!C) ea |= m);			/* bist */
+	  OBITOP (O_BSTZ, 1, 1, ea &= ~m;
+		  if (Z) ea |= m);			/* bstz */
+	  OBITOP (O_BISTZ, 1, 1, ea &= ~m;
+		  if (!Z) ea |= m);			/* bistz */
+	  OBITOP (O_BAND, 1, 0, c = (ea & m) && C);	/* band */
+	  OBITOP (O_BIAND, 1, 0, c = !(ea & m) && C);	/* biand */
+	  OBITOP (O_BOR, 1, 0, c = (ea & m) || C);	/* bor  */
+	  OBITOP (O_BIOR, 1, 0, c = !(ea & m) || C);	/* bior */
+	  OBITOP (O_BXOR, 1, 0, c = ((ea & m) != 0)!= C);	/* bxor */
+	  OBITOP (O_BIXOR, 1, 0, c = !(ea & m) != C);	/* bixor */
+
+	case O (O_BFLD, SB):				/* bfld */
+	  /* bitfield load */
+	  ea = 0;
+	  if (fetch (sd, &code->src, &bit))
+	    goto end;
+
+	  if (bit != 0)
+	    {
+	      if (fetch (sd, &code->dst, &ea))
+		goto end;
+
+	      ea &= bit;
+	      while (!(bit & 1))
+		{
+		  ea  >>= 1;
+		  bit >>= 1;
+		}
+	    }
+	  if (store (sd, &code->op3, ea))
+	    goto end;
+
+	  goto next;
+
+	case O(O_BFST, SB):			/* bfst */
+	  /* bitfield store */
+	  /* NOTE: the imm8 value is in dst, and the ea value
+	     (which is actually the destination) is in op3.
+	     It has to be that way, to avoid breaking the assembler.  */
+
+	  if (fetch (sd, &code->dst, &bit))	/* imm8 */
+	    goto end;
+	  if (bit == 0)				/* noop -- nothing to do.  */
+	    goto next;
+
+	  if (fetch (sd, &code->src, &rd))	/* reg8 src */
+	    goto end;
+
+	  if (fetch2 (sd, &code->op3, &ea))	/* ea dst */
+	    goto end;
+
+	  /* Left-shift the register data into position.  */
+	  for (tmp = bit; !(tmp & 1); tmp >>= 1)
+	    rd <<= 1;
+
+	  /* Combine it with the neighboring bits.  */
+	  ea = (ea & ~bit) | (rd & bit);
 
-	case O (O_TAS, SB):
+	  /* Put it back.  */
+	  if (store2 (sd, &code->op3, ea))
+	    goto end;
+	  goto next;
+
+	case O (O_CLRMAC, SN):		/* clrmac */
+	  h8_set_mach (sd, 0);
+	  h8_set_macl (sd, 0);
+	  h8_set_macZ (sd, 1);
+	  h8_set_macV (sd, 0);
+	  h8_set_macN (sd, 0);
+	  goto next;
+
+	case O (O_STMAC, SL):		/* stmac, 260 */
+	  switch (code->src.type) {
+	  case X (OP_MACH, SL): 
+	    res = h8_get_mach (sd);
+	    if (res & 0x200)		/* sign extend */
+	      res |= 0xfffffc00;
+	    break;
+	  case X (OP_MACL, SL): 
+	    res = h8_get_macl (sd);
+	    break;
+	  default:	goto illegal;
+	  }
+	  nz = !h8_get_macZ (sd);
+	  n = h8_get_macN (sd);
+	  v = h8_get_macV (sd);
+
+	  if (store (sd, &code->dst, res))
+	    goto end;
+
+	  goto next;
+
+	case O (O_LDMAC, SL):		/* ldmac, 179 */
+	  if (fetch (sd, &code->src, &rd))
+	    goto end;
+
+	  switch (code->dst.type) {
+	  case X (OP_MACH, SL):	
+	    rd &= 0x3ff;		/* Truncate to 10 bits */
+	    h8_set_mach (sd, rd);
+	    break;
+	  case X (OP_MACL, SL):	
+	    h8_set_macl (sd, rd);
+	    break;
+	  default:	goto illegal;
+	  }
+	  h8_set_macV (sd, 0);
+	  goto next;
+
+	case O (O_MAC, SW):
+	  if (fetch (sd, &code->src, &rd) ||
+	      fetch (sd, &code->dst, &res))
+	    goto end;
+
+	  /* Ye gods, this is non-portable!
+	     However, the existing mul/div code is similar.  */
+	  res = SEXTSHORT (res) * SEXTSHORT (rd);
+
+	  if (h8_get_macS (sd))		/* Saturating mode */
+	    {
+	      long long mac = h8_get_macl (sd);
+
+	      if (mac & 0x80000000)		/* sign extend */
+		mac |= 0xffffffff00000000LL;
+
+	      mac += res;
+	      if (mac > 0x7fffffff || mac < 0xffffffff80000000LL)
+		h8_set_macV (sd, 1);
+	      h8_set_macZ (sd, (mac == 0));
+	      h8_set_macN (sd, (mac  < 0));
+	      h8_set_macl (sd, (int) mac);
+	    }
+	  else				/* "Less Saturating" mode */
+	    {
+	      long long mac = h8_get_mach (sd);
+	      mac <<= 32;
+	      mac += h8_get_macl (sd);
+
+	      if (mac & 0x20000000000LL)	/* sign extend */
+		mac |= 0xfffffc0000000000LL;
+
+	      mac += res;
+	      if (mac > 0x1ffffffffffLL || 
+		  mac < (long long) 0xfffffe0000000000LL)
+		h8_set_macV (sd, 1);
+	      h8_set_macZ (sd, (mac == 0));
+	      h8_set_macN (sd, (mac  < 0));
+	      h8_set_macl (sd, (int) mac);
+	      mac >>= 32;
+	      h8_set_mach (sd, (int) (mac & 0x3ff));
+	    }
+	  goto next;
+
+	case O (O_MULS, SW):		/* muls.w */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  /* FIXME: is this the right place to be doing sign extend?  */
+	  if (OP_KIND (code->src.type) == OP_IMM &&
+	      (ea & 8) != 0)
+	    ea |= 0xfff0;
+	  else
+	    ea = SEXTSHORT (ea);
+
+	  res = SEXTSHORT (ea * SEXTSHORT (rd));
+
+	  n  = res & 0x8000;
+	  nz = res & 0xffff;
+	  if (store (sd, &code->dst, res))
+	    goto end;
+
+	  goto next;
+
+	case O (O_MULS, SL):		/* muls.l */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  /* FIXME: is this the right place to be doing sign extend?  */
+	  if (OP_KIND (code->src.type) == OP_IMM &&
+	      (ea & 8) != 0)
+	    ea |= 0xfffffff0;
+
+	  res = ea * rd;
+
+	  n  = res & 0x80000000;
+	  nz = res & 0xffffffff;
+	  if (store (sd, &code->dst, res))
+	    goto end;
+	  goto next;
+
+	case O (O_MULSU, SL):		/* muls/u.l */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  /* FIXME: is this the right place to be doing sign extend?  */
+	  if (OP_KIND (code->src.type) == OP_IMM &&
+	      (ea & 8) != 0)
+	    ea |= 0xfffffff0;
+
+	  /* Compute upper 32 bits of the 64-bit result.  */
+	  res = (((long long) ea) * ((long long) rd)) >> 32;
+
+	  n  = res & 0x80000000;
+	  nz = res & 0xffffffff;
+	  if (store (sd, &code->dst, res))
+	    goto end;
+	  goto next;
+
+	case O (O_MULU, SW):		/* mulu.w */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  res = UEXTSHORT ((UEXTSHORT (ea) * UEXTSHORT (rd)));
+
+	  /* Don't set Z or N.  */
+	  if (store (sd, &code->dst, res))
+	    goto end;
+
+	  goto next;
+
+	case O (O_MULU, SL):		/* mulu.l */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  res = ea * rd;
+
+	  /* Don't set Z or N.  */
+	  if (store (sd, &code->dst, res))
+	    goto end;
+
+	  goto next;
+
+	case O (O_MULUU, SL):		/* mulu/u.l */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  /* Compute upper 32 bits of the 64-bit result.  */
+	  res = (((unsigned long long) (unsigned) ea) *
+		 ((unsigned long long) (unsigned) rd)) >> 32;
+
+	  /* Don't set Z or N.  */
+	  if (store (sd, &code->dst, res))
+	    goto end;
+
+	  goto next;
+
+	case O (O_MULXS, SB):		/* mulxs.b */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  /* FIXME: is this the right place to be doing sign extend?  */
+	  if (OP_KIND (code->src.type) == OP_IMM &&
+	      (ea & 8) != 0)
+	    ea |= 0xfffffff0;
+	  else
+	    ea = SEXTCHAR (ea);
+
+	  res = ea * SEXTCHAR (rd);
+
+	  n  = res & 0x8000;
+	  nz = res & 0xffff;
+	  if (store (sd, &code->dst, res))
+	    goto end;
+
+	  goto next;
+
+	case O (O_MULXS, SW):		/* mulxs.w */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  /* FIXME: is this the right place to be doing sign extend?  */
+	  if (OP_KIND (code->src.type) == OP_IMM &&
+	      (ea & 8) != 0)
+	    ea |= 0xfff0;
+	  else
+	    ea = SEXTSHORT (ea);
+
+	  res = ea * SEXTSHORT (rd & 0xffff);
+
+	  n  = res & 0x80000000;
+	  nz = res & 0xffffffff;
+	  if (store (sd, &code->dst, res))
+	    goto end;
+
+	  goto next;
+
+	case O (O_MULXU, SB):		/* mulxu.b */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  res = UEXTCHAR (ea) * UEXTCHAR (rd);
+
+	  if (store (sd, &code->dst, res))
+	    goto end;
+
+	  goto next;
+
+	case O (O_MULXU, SW):		/* mulxu.w */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  res = UEXTSHORT (ea) * UEXTSHORT (rd);
+
+	  if (store (sd, &code->dst, res))
+	    goto end;
+
+	  goto next;
+
+	case O (O_TAS, SB):		/* tas, (test and set?) */
 	  if (!h8300smode || code->src.type != X (OP_REG, SL))
 	    goto illegal;
 	  switch (code->src.reg)
@@ -2013,127 +3911,297 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	    default:
 	      goto illegal;
 	    }
-	  res = fetch (&code->src);
-	  store (&code->src, res | 0x80);
+	  if (fetch (sd, &code->src, &res))
+	    goto end;
+	  if (store (sd, &code->src, res | 0x80))
+	    goto end;
+
 	  goto just_flags_log8;
 
-	case O (O_DIVU, SB):
-	  {
-	    rd = GET_W_REG (code->dst.reg);
-	    ea = GET_B_REG (code->src.reg);
-	    if (ea)
-	      {
-		tmp = (unsigned) rd % ea;
-		rd = (unsigned) rd / ea;
-	      }
-	    SET_W_REG (code->dst.reg, (rd & 0xff) | (tmp << 8));
-	    n = ea & 0x80;
-	    nz = ea & 0xff;
+	case O (O_DIVU, SW):			/* divu.w */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
 
-	    goto next;
-	  }
-	case O (O_DIVU, SW):
-	  {
-	    rd = GET_L_REG (code->dst.reg);
-	    ea = GET_W_REG (code->src.reg);
-	    n = ea & 0x8000;
-	    nz = ea & 0xffff;
-	    if (ea)
-	      {
-		tmp = (unsigned) rd % ea;
-		rd = (unsigned) rd / ea;
-	      }
-	    SET_L_REG (code->dst.reg, (rd & 0xffff) | (tmp << 16));
-	    goto next;
-	  }
+	  n  = ea & 0x8000;
+	  nz = ea & 0xffff;
+	  if (ea)
+	    res = (unsigned) (UEXTSHORT (rd) / UEXTSHORT (ea));
+	  else
+	    res = 0;
 
-	case O (O_DIVS, SB):
-	  {
+	  if (store (sd, &code->dst, res))
+	    goto end;
+	  goto next;
 
-	    rd = SEXTSHORT (GET_W_REG (code->dst.reg));
-	    ea = SEXTCHAR (GET_B_REG (code->src.reg));
-	    if (ea)
-	      {
-		tmp = (int) rd % (int) ea;
-		rd = (int) rd / (int) ea;
-		n = rd & 0x8000;
-		nz = 1;
-	      }
-	    else
-	      nz = 0;
-	    SET_W_REG (code->dst.reg, (rd & 0xff) | (tmp << 8));
-	    goto next;
-	  }
-	case O (O_DIVS, SW):
-	  {
-	    rd = GET_L_REG (code->dst.reg);
-	    ea = SEXTSHORT (GET_W_REG (code->src.reg));
-	    if (ea)
-	      {
-		tmp = (int) rd % (int) ea;
-		rd = (int) rd / (int) ea;
-		n = rd & 0x80000000;
-		nz = 1;
-	      }
-	    else
-	      nz = 0;
-	    SET_L_REG (code->dst.reg, (rd & 0xffff) | (tmp << 16));
-	    goto next;
-	  }
-	case O (O_EXTS, SW):
-	  rd = GET_W_REG (code->src.reg) & 0xff; /* Yes, src, not dst.  */
+	case O (O_DIVU, SL):			/* divu.l */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  n  = ea & 0x80000000;
+	  nz = ea & 0xffffffff;
+	  if (ea)
+	    res = (unsigned) rd / ea;
+	  else
+	    res = 0;
+
+	  if (store (sd, &code->dst, res))
+	    goto end;
+	  goto next;
+
+	case O (O_DIVS, SW):			/* divs.w */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  /* FIXME: is this the right place to be doing sign extend?  */
+	  if (OP_KIND (code->src.type) == OP_IMM &&
+	      (ea & 8) != 0)
+	    ea |= 0xfffffff0;
+
+	  if (ea)
+	    {
+	      res = SEXTSHORT (rd) / SEXTSHORT (ea);
+	      nz  = 1;
+	    }
+	  else
+	    {
+	      res = 0;
+	      nz  = 0;
+	    }
+
+	  n = res & 0x8000;
+	  if (store (sd, &code->dst, res))
+	    goto end;
+	  goto next;
+
+	case O (O_DIVS, SL):			/* divs.l */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  /* FIXME: is this the right place to be doing sign extend?  */
+	  if (OP_KIND (code->src.type) == OP_IMM &&
+	      (ea & 8) != 0)
+	    ea |= 0xfffffff0;
+
+	  if (ea)
+	    {
+	      res = rd / ea;
+	      nz  = 1;
+	    }
+	  else
+	    {
+	      res = 0;
+	      nz  = 0;
+	    }
+
+	  n = res & 0x80000000;
+	  if (store (sd, &code->dst, res))
+	    goto end;
+	  goto next;
+
+	case O (O_DIVXU, SB):			/* divxu.b */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  rd = UEXTSHORT (rd);
+	  ea = UEXTCHAR (ea);
+
+	  n  = ea & 0x80;
+	  nz = ea & 0xff;
+	  if (ea)
+	    {
+	      tmp = (unsigned) rd % ea;
+	      res = (unsigned) rd / ea;
+	    }
+	  else
+	    {
+	      tmp = 0;
+	      res = 0;
+	    }
+
+	  if (store (sd, &code->dst, (res & 0xffff) | (tmp << 8)))
+	    goto end;
+	  goto next;
+
+	case O (O_DIVXU, SW):			/* divxu.w */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  ea = UEXTSHORT (ea);
+
+	  n  = ea & 0x8000;
+	  nz = ea & 0xffff;
+	  if (ea)
+	    {
+	      tmp = (unsigned) rd % ea;
+	      res = (unsigned) rd / ea;
+	    }
+	  else
+	    {
+	      tmp = 0;
+	      res = 0;
+	    }
+
+	  if (store (sd, &code->dst, (res & 0xffff) | (tmp << 16)))
+	    goto end;
+	  goto next;
+
+	case O (O_DIVXS, SB):			/* divxs.b */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  rd = SEXTSHORT (rd);
+
+	  /* FIXME: is this the right place to be doing sign extend?  */
+	  if (OP_KIND (code->src.type) == OP_IMM &&
+	      (ea & 8) != 0)
+	    ea |= 0xfffffff0;
+	  else
+	    ea = SEXTCHAR (ea);
+
+	  if (ea)
+	    {
+	      tmp = (int) rd % (int) ea;
+	      res = (int) rd / (int) ea;
+	      nz  = 1;
+	    }
+	  else
+	    {
+	      tmp = 0;
+	      res = 0;
+	      nz  = 0;
+	    }
+
+	  n = res & 0x8000;
+	  if (store (sd, &code->dst, (res & 0xff) | (tmp << 8)))
+	    goto end;
+	  goto next;
+
+	case O (O_DIVXS, SW):			/* divxs.w */
+	  if (fetch (sd, &code->src, &ea) ||
+	      fetch (sd, &code->dst, &rd))
+	    goto end;
+
+	  /* FIXME: is this the right place to be doing sign extend?  */
+	  if (OP_KIND (code->src.type) == OP_IMM &&
+	      (ea & 8) != 0)
+	    ea |= 0xfffffff0;
+	  else
+	    ea = SEXTSHORT (ea);
+
+	  if (ea)
+	    {
+	      tmp = (int) rd % (int) ea;
+	      res = (int) rd / (int) ea;
+	      nz  = 1;
+	    }
+	  else
+	    {
+	      tmp = 0;
+	      res = 0;
+	      nz  = 0;
+	    }
+
+	  n = res & 0x80000000;
+	  if (store (sd, &code->dst, (res & 0xffff) | (tmp << 16)))
+	    goto end;
+	  goto next;
+
+	case O (O_EXTS, SW):			/* exts.w, signed extend */
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
 	  ea = rd & 0x80 ? -256 : 0;
-	  res = rd + ea;
+	  res = (rd & 0xff) + ea;
 	  goto log16;
-	case O (O_EXTS, SL):
-	  rd = GET_W_REG (code->src.reg) & 0xffff;
+
+	case O (O_EXTS, SL):			/* exts.l, signed extend */
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+	  if (code->src.type == X (OP_IMM, SL))
+	    {
+	      if (fetch (sd, &code->src, &ea))
+		goto end;
+
+	      if (ea == 2)			/* exts.l #2, nn */
+		{
+		  /* Sign-extend from 8-bit to 32-bit.  */
+		  ea = rd & 0x80 ? -256 : 0;
+		  res = (rd & 0xff) + ea;
+		  goto log32;
+		}
+	    }
+	  /* Sign-extend from 16-bit to 32-bit.  */
 	  ea = rd & 0x8000 ? -65536 : 0;
-	  res = rd + ea;
+	  res = (rd & 0xffff) + ea;
 	  goto log32;
-	case O (O_EXTU, SW):
-	  rd = GET_W_REG (code->src.reg) & 0xff;
+
+	case O (O_EXTU, SW):			/* extu.w, unsigned extend */
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
 	  ea = 0;
-	  res = rd + ea;
+	  res = (rd & 0xff) + ea;
 	  goto log16;
-	case O (O_EXTU, SL):
-	  rd = GET_W_REG (code->src.reg) & 0xffff;
+
+	case O (O_EXTU, SL):			/* extu.l, unsigned extend */
+	  if (fetch2 (sd, &code->dst, &rd))
+	    goto end;
+	  if (code->src.type == X (OP_IMM, SL))
+	    {
+	      if (fetch (sd, &code->src, &ea))
+		goto end;
+
+	      if (ea == 2)			/* extu.l #2, nn */
+		{
+		  /* Zero-extend from 8-bit to 32-bit.  */
+		  ea = 0;
+		  res = (rd & 0xff) + ea;
+		  goto log32;
+		}
+	    }
+	  /* Zero-extend from 16-bit to 32-bit.  */
 	  ea = 0;
-	  res = rd + ea;
+	  res = (rd & 0xffff) + ea;
 	  goto log32;
 
-	case O (O_NOP, SN):
+	case O (O_NOP, SN):			/* nop */
 	  goto next;
 
-	case O (O_STM, SL):
+	case O (O_STM, SL):			/* stm, store to memory */
 	  {
 	    int nregs, firstreg, i;
 
 	    nregs = GET_MEMORY_B (pc + 1);
 	    nregs >>= 4;
 	    nregs &= 0xf;
-	    firstreg = GET_MEMORY_B (pc + 3);
+	    firstreg = code->src.reg;
 	    firstreg &= 0xf;
 	    for (i = firstreg; i <= firstreg + nregs; i++)
 	      {
-		cpu.regs[7] -= 4;
-		SET_MEMORY_L (cpu.regs[7], cpu.regs[i]);
+		h8_set_reg (sd, SP_REGNUM, h8_get_reg (sd, SP_REGNUM) - 4);
+		SET_MEMORY_L (h8_get_reg (sd, SP_REGNUM), h8_get_reg (sd, i));
 	      }
 	  }
 	  goto next;
 
-	case O (O_LDM, SL):
+	case O (O_LDM, SL):			/* ldm,  load from memory */
 	  {
 	    int nregs, firstreg, i;
 
 	    nregs = GET_MEMORY_B (pc + 1);
 	    nregs >>= 4;
 	    nregs &= 0xf;
-	    firstreg = GET_MEMORY_B (pc + 3);
+	    firstreg = code->dst.reg;
 	    firstreg &= 0xf;
 	    for (i = firstreg; i >= firstreg - nregs; i--)
 	      {
-		cpu.regs[i] = GET_MEMORY_L (cpu.regs[7]);
-		cpu.regs[7] += 4;
+		h8_set_reg (sd, i, GET_MEMORY_L (h8_get_reg (sd, SP_REGNUM)));
+		h8_set_reg (sd, SP_REGNUM, h8_get_reg (sd, SP_REGNUM) + 4);
 	      }
 	  }
 	  goto next;
@@ -2141,73 +4209,91 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	case O (O_DAA, SB):
 	  /* Decimal Adjust Addition.  This is for BCD arithmetic.  */
 	  res = GET_B_REG (code->src.reg);
-	  if (!c && (0 <= (res >>  4) && (res >>  4) <= 9) 
-	      && !h && (0 <= (res & 0xf) && (res & 0xf) <= 9))
+	  if (!c && (0 <= (res >>  4) && (res >>  4) <= 9) && 
+	      !h && (0 <= (res & 0xf) && (res & 0xf) <= 9))
 	    res = res;		/* Value added == 0.  */
-	  else if (!c && (0  <= (res >>  4) && (res >>  4) <=  8) 
-		   && !h && (10 <= (res & 0xf) && (res & 0xf) <= 15))
+	  else if (!c && (0  <= (res >>  4) && (res >>  4) <=  8) && 
+		   !h && (10 <= (res & 0xf) && (res & 0xf) <= 15))
 	    res = res + 0x6;		/* Value added == 6.  */
-	  else if (!c && (0 <= (res >>  4) && (res >>  4) <= 9) 
-		   && h && (0 <= (res & 0xf) && (res & 0xf) <= 3))
+	  else if (!c && (0 <= (res >>  4) && (res >>  4) <= 9) && 
+		    h && (0 <= (res & 0xf) && (res & 0xf) <= 3))
 	    res = res + 0x6;		/* Value added == 6.  */
-	  else if (!c && (10 <= (res >>  4) && (res >>  4) <= 15) 
-		   && !h && (0  <= (res & 0xf) && (res & 0xf) <=  9))
+	  else if (!c && (10 <= (res >>  4) && (res >>  4) <= 15) && 
+		   !h && (0  <= (res & 0xf) && (res & 0xf) <=  9))
+	    res = res + 0x60;		/* Value added == 60.  */
+	  else if (!c && (9  <= (res >>  4) && (res >>  4) <= 15) && 
+		   !h && (10 <= (res & 0xf) && (res & 0xf) <= 15))
+	    res = res + 0x66;		/* Value added == 66.  */
+	  else if (!c && (10 <= (res >>  4) && (res >>  4) <= 15) && 
+		    h && (0  <= (res & 0xf) && (res & 0xf) <=  3))
+	    res = res + 0x66;		/* Value added == 66.  */
+	  else if ( c && (1 <= (res >>  4) && (res >>  4) <= 2) && 
+		   !h && (0 <= (res & 0xf) && (res & 0xf) <= 9))
 	    res = res + 0x60;		/* Value added == 60.  */
-	  else if (!c && (9  <= (res >>  4) && (res >>  4) <= 15) 
-		   && !h && (10 <= (res & 0xf) && (res & 0xf) <= 15))
+	  else if ( c && (1  <= (res >>  4) && (res >>  4) <=  2) && 
+		   !h && (10 <= (res & 0xf) && (res & 0xf) <= 15))
 	    res = res + 0x66;		/* Value added == 66.  */
-	  else if (!c && (10 <= (res >>  4) && (res >>  4) <= 15) 
-		   && h && (0  <= (res & 0xf) && (res & 0xf) <=  3))
+	  else if (c && (1 <= (res >>  4) && (res >>  4) <= 3) && 
+		   h && (0 <= (res & 0xf) && (res & 0xf) <= 3))
 	    res = res + 0x66;		/* Value added == 66.  */
-	  else if (c && (1 <= (res >>  4) && (res >>  4) <= 2) 
-		   && !h && (0 <= (res & 0xf) && (res & 0xf) <= 9))
-	    res = res + 0x160;		/* Value added == 60, plus 'carry'.  */
-	  else if (c && (1  <= (res >>  4) && (res >>  4) <=  2) 
-		   && !h && (10 <= (res & 0xf) && (res & 0xf) <= 15))
-	    res = res + 0x166;		/* Value added == 66, plus 'carry'.  */
-	  else if (c && (1 <= (res >>  4) && (res >>  4) <= 3) 
-		   && h && (0 <= (res & 0xf) && (res & 0xf) <= 3))
-	    res = res + 0x166;		/* Value added == 66, plus 'carry'.  */
 
 	  goto alu8;
 
 	case O (O_DAS, SB):
 	  /* Decimal Adjust Subtraction.  This is for BCD arithmetic.  */
 	  res = GET_B_REG (code->src.reg); /* FIXME fetch, fetch2... */
-	  if (!c && (0 <= (res >>  4) && (res >>  4) <= 9) 
-	      && !h && (0 <= (res & 0xf) && (res & 0xf) <= 9))
+	  if (!c && (0 <= (res >>  4) && (res >>  4) <= 9) && 
+	      !h && (0 <= (res & 0xf) && (res & 0xf) <= 9))
 	    res = res;		/* Value added == 0.  */
-	  else if (!c && (0 <= (res >>  4) && (res >>  4) <=  8) 
-		   && h && (6 <= (res & 0xf) && (res & 0xf) <= 15))
+	  else if (!c && (0 <= (res >>  4) && (res >>  4) <=  8) && 
+		    h && (6 <= (res & 0xf) && (res & 0xf) <= 15))
 	    res = res + 0xfa;		/* Value added == 0xfa.  */
-	  else if (c && (7 <= (res >>  4) && (res >>  4) <= 15) 
-		   && !h && (0 <= (res & 0xf) && (res & 0xf) <=  9))
+	  else if ( c && (7 <= (res >>  4) && (res >>  4) <= 15) && 
+		   !h && (0 <= (res & 0xf) && (res & 0xf) <=  9))
 	    res = res + 0xa0;		/* Value added == 0xa0.  */
-	  else if (c && (6 <= (res >>  4) && (res >>  4) <= 15) 
-		   && h && (6 <= (res & 0xf) && (res & 0xf) <= 15))
+	  else if (c && (6 <= (res >>  4) && (res >>  4) <= 15) && 
+		   h && (6 <= (res & 0xf) && (res & 0xf) <= 15))
 	    res = res + 0x9a;		/* Value added == 0x9a.  */
 
 	  goto alu8;
 
 	default:
 	illegal:
-	  cpu.state = SIM_STATE_STOPPED;
-	  cpu.exception = SIGILL;
+	  sim_engine_set_run_state (sd, sim_stopped, SIGILL);
 	  goto end;
 
 	}
-      abort ();
+
+      (*sim_callback->printf_filtered) (sim_callback,
+					"sim_resume: internal error.\n");
+      sim_engine_set_run_state (sd, sim_stopped, SIGILL);
+      goto end;
 
     setc:
-      if (code->dst.type == OP_CCR)
+      if (code->dst.type == X (OP_CCR, SB) ||
+	  code->dst.type == X (OP_CCR, SW))
 	{
-	  cpu.ccr = res;
-	  GETSR ();
+	  h8_set_ccr (sd, res);
+	  /* Get Status Register (flags).  */
+	  c = (h8_get_ccr (sd) >> 0) & 1;
+	  v = (h8_get_ccr (sd) >> 1) & 1;
+	  nz = !((h8_get_ccr (sd) >> 2) & 1);
+	  n = (h8_get_ccr (sd) >> 3) & 1;
+	  u = (h8_get_ccr (sd) >> 4) & 1;
+	  h = (h8_get_ccr (sd) >> 5) & 1;
+	  ui = ((h8_get_ccr (sd) >> 6) & 1);
+	  intMaskBit = (h8_get_ccr (sd) >> 7) & 1;
 	}
-      else if (code->dst.type == OP_EXR && h8300smode)
+      else if (h8300smode &&
+	       (code->dst.type == X (OP_EXR, SB) ||
+		code->dst.type == X (OP_EXR, SW)))
 	{
-	  cpu.exr = res;
-	  GETEXR ();
+	  h8_set_exr (sd, res);
+	  if (h8300smode)	/* Get exr.  */
+	    {
+	      trace = (h8_get_exr (sd) >> 7) & 1;
+	      intMask = h8_get_exr (sd) & 7;
+	    }
 	}
       else
 	goto illegal;
@@ -2216,7 +4302,11 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 
     condtrue:
       /* When a branch works */
-      pc = code->src.literal;
+      if (fetch (sd, &code->src, &res))
+	goto end;
+      if (res & 1)		/* bad address */
+	goto illegal;
+      pc = code->next_pc + res;
       goto end;
 
       /* Set the cond codes from res */
@@ -2229,7 +4319,6 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
       v = (rd & 0x7f) == 0x7f;
       goto next;
 
-
       /* Set the flags after an 16 bit inc/dec operation */
     just_flags_inc16:
       n = res & 0x8000;
@@ -2237,7 +4326,6 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
       v = (rd & 0x7fff) == 0x7fff;
       goto next;
 
-
       /* Set the flags after an 32 bit inc/dec operation */
     just_flags_inc32:
       n = res & 0x80000000;
@@ -2245,30 +4333,34 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
       v = (rd & 0x7fffffff) == 0x7fffffff;
       goto next;
 
-
     shift8:
       /* Set flags after an 8 bit shift op, carry,overflow set in insn */
       n = (rd & 0x80);
       nz = rd & 0xff;
-      SET_B_REG (code->src.reg, rd);
+      if (store2 (sd, &code->dst, rd))
+	goto end;
       goto next;
 
     shift16:
       /* Set flags after an 16 bit shift op, carry,overflow set in insn */
       n = (rd & 0x8000);
       nz = rd & 0xffff;
-      SET_W_REG (code->src.reg, rd);
+      if (store2 (sd, &code->dst, rd))
+	goto end;
       goto next;
 
     shift32:
       /* Set flags after an 32 bit shift op, carry,overflow set in insn */
       n = (rd & 0x80000000);
       nz = rd & 0xffffffff;
-      SET_L_REG (code->src.reg, rd);
+      if (store2 (sd, &code->dst, rd))
+	goto end;
       goto next;
 
     log32:
-      store (&code->dst, res);
+      if (store2 (sd, &code->dst, res))
+	goto end;
+
     just_flags_log32:
       /* flags after a 32bit logical operation */
       n = res & 0x80000000;
@@ -2277,7 +4369,9 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
       goto next;
 
     log16:
-      store (&code->dst, res);
+      if (store2 (sd, &code->dst, res))
+	goto end;
+
     just_flags_log16:
       /* flags after a 16bit logical operation */
       n = res & 0x8000;
@@ -2285,9 +4379,10 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
       v = 0;
       goto next;
 
-
     log8:
-      store (&code->dst, res);
+      if (store2 (sd, &code->dst, res))
+	goto end;
+
     just_flags_log8:
       n = res & 0x80;
       nz = res & 0xff;
@@ -2295,7 +4390,9 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
       goto next;
 
     alu8:
-      SET_B_REG (code->dst.reg, res);
+      if (store2 (sd, &code->dst, res))
+	goto end;
+
     just_flags_alu8:
       n = res & 0x80;
       nz = res & 0xff;
@@ -2303,10 +4400,12 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
       switch (code->opcode / 4)
 	{
 	case O_ADD:
+	case O_ADDX:
 	  v = ((rd & 0x80) == (ea & 0x80)
 	       && (rd & 0x80) != (res & 0x80));
 	  break;
 	case O_SUB:
+	case O_SUBX:
 	case O_CMP:
 	  v = ((rd & 0x80) != (-ea & 0x80)
 	       && (rd & 0x80) != (res & 0x80));
@@ -2314,11 +4413,16 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	case O_NEG:
 	  v = (rd == 0x80);
 	  break;
+	case O_DAA:
+	case O_DAS:
+	  break;	/* No effect on v flag.  */
 	}
       goto next;
 
     alu16:
-      SET_W_REG (code->dst.reg, res);
+      if (store2 (sd, &code->dst, res))
+	goto end;
+
     just_flags_alu16:
       n = res & 0x8000;
       nz = res & 0xffff;
@@ -2326,10 +4430,12 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
       switch (code->opcode / 4)
 	{
 	case O_ADD:
+	case O_ADDX:
 	  v = ((rd & 0x8000) == (ea & 0x8000)
 	       && (rd & 0x8000) != (res & 0x8000));
 	  break;
 	case O_SUB:
+	case O_SUBX:
 	case O_CMP:
 	  v = ((rd & 0x8000) != (-ea & 0x8000)
 	       && (rd & 0x8000) != (res & 0x8000));
@@ -2341,18 +4447,23 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
       goto next;
 
     alu32:
-      SET_L_REG (code->dst.reg, res);
+      if (store2 (sd, &code->dst, res))
+	goto end;
+
     just_flags_alu32:
       n = res & 0x80000000;
       nz = res & 0xffffffff;
       switch (code->opcode / 4)
 	{
 	case O_ADD:
+	case O_ADDX:
 	  v = ((rd & 0x80000000) == (ea & 0x80000000)
 	       && (rd & 0x80000000) != (res & 0x80000000));
-	  c = ((unsigned) res < (unsigned) rd) || ((unsigned) res < (unsigned) ea);
+	  c = ((unsigned) res < (unsigned) rd) || 
+	    ((unsigned) res < (unsigned) ea);
 	  break;
 	case O_SUB:
+	case O_SUBX:
 	case O_CMP:
 	  v = ((rd & 0x80000000) != (-ea & 0x80000000)
 	       && (rd & 0x80000000) != (res & 0x80000000));
@@ -2365,34 +4476,37 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
 	}
       goto next;
 
-    next:;
-      pc = code->next_pc;
+    next:
+      if ((res = h8_get_delayed_branch (sd)) != 0)
+	{
+	  pc = res;
+	  h8_set_delayed_branch (sd, 0);
+	}
+      else
+	pc = code->next_pc;
 
     end:
-      ;
-#if 0
-      if (cpu.regs[8])
-	abort ();
-#endif
-
+      
       if (--poll_count < 0)
 	{
 	  poll_count = POLL_QUIT_INTERVAL;
 	  if ((*sim_callback->poll_quit) != NULL
 	      && (*sim_callback->poll_quit) (sim_callback))
-	    sim_stop (sd);
+	    sim_engine_set_run_state (sd, sim_stopped, SIGINT);
 	}
+      sim_engine_get_run_state (sd, &reason, &sigrc);
+    } while (reason == sim_running);
 
-    }
-  while (cpu.state == SIM_STATE_RUNNING);
-  cpu.ticks += get_now () - tick_start;
-  cpu.cycles += cycles;
-  cpu.insts += insts;
-
-  cpu.pc = pc;
-  BUILDSR ();
-  BUILDEXR ();
-  cpu.mask = oldmask;
+  h8_set_ticks (sd, h8_get_ticks (sd) + get_now () - tick_start);
+  h8_set_cycles (sd, h8_get_cycles (sd) + cycles);
+  h8_set_insts (sd, h8_get_insts (sd) + insts);
+  h8_set_pc (sd, pc);
+  BUILDSR (sd);
+
+  if (h8300smode)
+    h8_set_exr (sd, (trace<<7) | intMask);
+
+  h8_set_mask (sd, oldmask);
   signal (SIGINT, prev);
 }
 
@@ -2400,7 +4514,9 @@ int
 sim_trace (SIM_DESC sd)
 {
   /* FIXME: Unfinished.  */
-  abort ();
+  (*sim_callback->printf_filtered) (sim_callback,
+				    "sim_trace: trace not supported.\n");
+  return 1;	/* Done.  */
 }
 
 int
@@ -2408,18 +4524,20 @@ sim_write (SIM_DESC sd, SIM_ADDR addr, unsigned char *buffer, int size)
 {
   int i;
 
-  init_pointers ();
+  init_pointers (sd);
   if (addr < 0)
     return 0;
   for (i = 0; i < size; i++)
     {
       if (addr < memory_size)
 	{
-	  cpu.memory[addr + i] = buffer[i];
-	  cpu.cache_idx[addr + i] = 0;
+	  h8_set_memory    (sd, addr + i, buffer[i]);
+	  h8_set_cache_idx (sd, addr + i,  0);
 	}
       else
-	cpu.eightbit[(addr + i) & 0xff] = buffer[i];
+	{
+	  h8_set_eightbit (sd, (addr + i) & 0xff, buffer[i]);
+	}
     }
   return size;
 }
@@ -2427,13 +4545,13 @@ sim_write (SIM_DESC sd, SIM_ADDR addr, unsigned char *buffer, int size)
 int
 sim_read (SIM_DESC sd, SIM_ADDR addr, unsigned char *buffer, int size)
 {
-  init_pointers ();
+  init_pointers (sd);
   if (addr < 0)
     return 0;
   if (addr < memory_size)
-    memcpy (buffer, cpu.memory + addr, size);
+    memcpy (buffer, h8_get_memory_buf (sd) + addr, size);
   else
-    memcpy (buffer, cpu.eightbit + (addr & 0xff), size);
+    memcpy (buffer, h8_get_eightbit_buf (sd) + (addr & 0xff), size);
   return size;
 }
 
@@ -2448,14 +4566,16 @@ sim_store_register (SIM_DESC sd, int rn, unsigned char *value, int length)
   shortval = (value[0] << 8) | (value[1]);
   intval = h8300hmode ? longval : shortval;
 
-  init_pointers ();
+  init_pointers (sd);
   switch (rn)
     {
     case PC_REGNUM:
-      cpu.pc = intval;
+      h8_set_pc (sd, intval);
       break;
     default:
-      abort ();
+      (*sim_callback->printf_filtered) (sim_callback, 
+					"sim_store_register: bad regnum %d.\n",
+					rn);
     case R0_REGNUM:
     case R1_REGNUM:
     case R2_REGNUM:
@@ -2464,24 +4584,24 @@ sim_store_register (SIM_DESC sd, int rn, unsigned char *value, int length)
     case R5_REGNUM:
     case R6_REGNUM:
     case R7_REGNUM:
-      cpu.regs[rn] = intval;
+      h8_set_reg (sd, rn, intval);
       break;
     case CCR_REGNUM:
-      cpu.ccr = intval;
+      h8_set_ccr (sd, intval);
       break;
     case EXR_REGNUM:
-      cpu.exr = intval;
+      h8_set_exr (sd, intval);
       break;
     case CYCLE_REGNUM:
-      cpu.cycles = longval;
+      h8_set_cycles (sd, longval);
       break;
 
     case INST_REGNUM:
-      cpu.insts = longval;
+      h8_set_insts (sd, longval);
       break;
 
     case TICK_REGNUM:
-      cpu.ticks = longval;
+      h8_set_ticks (sd, longval);
       break;
     }
   return -1;
@@ -2493,22 +4613,26 @@ sim_fetch_register (SIM_DESC sd, int rn, unsigned char *buf, int length)
   int v;
   int longreg = 0;
 
-  init_pointers ();
+  init_pointers (sd);
 
   if (!h8300smode && rn >= EXR_REGNUM)
     rn++;
   switch (rn)
     {
     default:
-      abort ();
+      (*sim_callback->printf_filtered) (sim_callback, 
+					"sim_fetch_register: bad regnum %d.\n",
+					rn);
+      v = 0;
+      break;
     case CCR_REGNUM:
-      v = cpu.ccr;
+      v = h8_get_ccr (sd);
       break;
     case EXR_REGNUM:
-      v = cpu.exr;
+      v = h8_get_exr (sd);
       break;
     case PC_REGNUM:
-      v = cpu.pc;
+      v = h8_get_pc (sd);
       break;
     case R0_REGNUM:
     case R1_REGNUM:
@@ -2518,18 +4642,18 @@ sim_fetch_register (SIM_DESC sd, int rn, unsigned char *buf, int length)
     case R5_REGNUM:
     case R6_REGNUM:
     case R7_REGNUM:
-      v = cpu.regs[rn];
+      v = h8_get_reg (sd, rn);
       break;
     case CYCLE_REGNUM:
-      v = cpu.cycles;
+      v = h8_get_cycles (sd);
       longreg = 1;
       break;
     case TICK_REGNUM:
-      v = cpu.ticks;
+      v = h8_get_ticks (sd);
       longreg = 1;
       break;
     case INST_REGNUM:
-      v = cpu.insts;
+      v = h8_get_insts (sd);
       longreg = 1;
       break;
     }
@@ -2551,19 +4675,7 @@ sim_fetch_register (SIM_DESC sd, int rn, unsigned char *buf, int length)
 void
 sim_stop_reason (SIM_DESC sd, enum sim_stop *reason, int *sigrc)
 {
-#if 0 /* FIXME: This should work but we can't use it.
-	 grep for SLEEP above.  */
-  switch (cpu.state)
-    {
-    case SIM_STATE_EXITED : *reason = sim_exited; break;
-    case SIM_STATE_SIGNALLED : *reason = sim_signalled; break;
-    case SIM_STATE_STOPPED : *reason = sim_stopped; break;
-    default : abort ();
-    }
-#else
-  *reason = sim_stopped;
-#endif
-  *sigrc = cpu.exception;
+  sim_engine_get_run_state (sd, reason, sigrc);
 }
 
 /* FIXME: Rename to sim_set_mem_size.  */
@@ -2574,31 +4686,31 @@ sim_size (int n)
   /* Memory size is fixed.  */
 }
 
-void
-sim_set_simcache_size (int n)
+static void
+set_simcache_size (SIM_DESC sd, int n)
 {
-  if (cpu.cache)
-    free (cpu.cache);
+  if (sd->sim_cache)
+    free (sd->sim_cache);
   if (n < 2)
     n = 2;
-  cpu.cache = (decoded_inst *) malloc (sizeof (decoded_inst) * n);
-  memset (cpu.cache, 0, sizeof (decoded_inst) * n);
-  cpu.csize = n;
+  sd->sim_cache = (decoded_inst *) malloc (sizeof (decoded_inst) * n);
+  memset (sd->sim_cache, 0, sizeof (decoded_inst) * n);
+  sd->sim_cache_size = n;
 }
 
 
 void
 sim_info (SIM_DESC sd, int verbose)
 {
-  double timetaken = (double) cpu.ticks / (double) now_persec ();
-  double virttime = cpu.cycles / 10.0e6;
+  double timetaken = (double) h8_get_ticks (sd) / (double) now_persec ();
+  double virttime = h8_get_cycles (sd) / 10.0e6;
 
   (*sim_callback->printf_filtered) (sim_callback,
 				    "\n\n#instructions executed  %10d\n",
-				    cpu.insts);
+				    h8_get_insts (sd));
   (*sim_callback->printf_filtered) (sim_callback,
 				    "#cycles (v approximate) %10d\n",
-				    cpu.cycles);
+				    h8_get_cycles (sd));
   (*sim_callback->printf_filtered) (sim_callback,
 				    "#real time taken        %10.4f\n",
 				    timetaken);
@@ -2611,10 +4723,10 @@ sim_info (SIM_DESC sd, int verbose)
 				      virttime / timetaken);
   (*sim_callback->printf_filtered) (sim_callback,
 				    "#compiles               %10d\n",
-				    cpu.compiles);
+				    h8_get_compiles (sd));
   (*sim_callback->printf_filtered) (sim_callback,
 				    "#cache size             %10d\n",
-				    cpu.csize);
+				    sd->sim_cache_size);
 
 #ifdef ADEBUG
   /* This to be conditional on `what' (aka `verbose'),
@@ -2624,9 +4736,9 @@ sim_info (SIM_DESC sd, int verbose)
       int i;
       for (i = 0; i < O_LAST; i++)
 	{
-	  if (cpu.stats[i])
-	    (*sim_callback->printf_filtered) (sim_callback,
-					      "%d: %d\n", i, cpu.stats[i]);
+	  if (h8_get_stats (sd, i))
+	    (*sim_callback->printf_filtered) (sim_callback, "%d: %d\n", 
+					      i, h8_get_stats (sd, i));
 	}
     }
 #endif
@@ -2636,28 +4748,100 @@ sim_info (SIM_DESC sd, int verbose)
    FLAG is non-zero for the H8/300H.  */
 
 void
-set_h8300h (int h_flag, int s_flag)
+set_h8300h (int h_flag, int s_flag, int sx_flag)
 {
   /* FIXME: Much of the code in sim_load can be moved to sim_open.
      This function being replaced by a sim_open:ARGV configuration
      option.  */
-  h8300hmode = h_flag;
-  h8300smode = s_flag;
+
+  h8300hmode  = h_flag;
+  h8300smode  = s_flag;
+  h8300sxmode = sx_flag;
+}
+
+/* Cover function of sim_state_free to free the cpu buffers as well.  */
+
+static void
+free_state (SIM_DESC sd)
+{
+  if (STATE_MODULES (sd) != NULL)
+    sim_module_uninstall (sd);
+
+  /* Fixme: free buffers in _sim_cpu.  */
+  sim_state_free (sd);
 }
 
 SIM_DESC
 sim_open (SIM_OPEN_KIND kind, 
-	  struct host_callback_struct *ptr, 
+	  struct host_callback_struct *callback, 
 	  struct bfd *abfd, 
 	  char **argv)
 {
+  SIM_DESC sd;
+  sim_cpu *cpu;
+
+  sd = sim_state_alloc (kind, callback);
+  sd->cpu = sim_cpu_alloc (sd, 0);
+  cpu = STATE_CPU (sd, 0);
+  SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
+  sim_state_initialize (sd, cpu);
+  /* sim_cpu object is new, so some initialization is needed.  */
+  init_pointers_needed = 1;
+
+  /* For compatibility (FIXME: is this right?).  */
+  current_alignment = NONSTRICT_ALIGNMENT;
+  current_target_byte_order = BIG_ENDIAN;
+
+  if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
+    {
+      free_state (sd);
+      return 0;
+    }
+
+    /* getopt will print the error message so we just have to exit if
+       this fails.  FIXME: Hmmm...  in the case of gdb we need getopt
+       to call print_filtered.  */
+  if (sim_parse_args (sd, argv) != SIM_RC_OK)
+    {
+      /* Uninstall the modules to avoid memory leaks,
+         file descriptor leaks, etc.  */
+      free_state (sd);
+      return 0;
+    }
+
+  /* Check for/establish the a reference program image.  */
+  if (sim_analyze_program (sd,
+			   (STATE_PROG_ARGV (sd) != NULL
+			    ? *STATE_PROG_ARGV (sd)
+			    : NULL), abfd) != SIM_RC_OK)
+    {
+      free_state (sd);
+      return 0;
+    }
+
+  /* Establish any remaining configuration options.  */
+  if (sim_config (sd) != SIM_RC_OK)
+    {
+      free_state (sd);
+      return 0;
+    }
+
+  if (sim_post_argv_init (sd) != SIM_RC_OK)
+    {
+      /* Uninstall the modules to avoid memory leaks,
+         file descriptor leaks, etc.  */
+      free_state (sd);
+      return 0;
+    }
+
+  /*  sim_hw_configure (sd); */
+
   /* FIXME: Much of the code in sim_load can be moved here.  */
 
   sim_kind = kind;
   myname = argv[0];
-  sim_callback = ptr;
-  /* Fudge our descriptor.  */
-  return (SIM_DESC) 1;
+  sim_callback = callback;
+  return sd;
 }
 
 void
@@ -2690,8 +4874,13 @@ sim_load (SIM_DESC sd, char *prog, bfd *abfd, int from_tty)
       if (bfd_check_format (prog_bfd, bfd_object))
 	{
 	  unsigned long mach = bfd_get_mach (prog_bfd);
-	  set_h8300h (mach == bfd_mach_h8300h || mach == bfd_mach_h8300s,
-		      mach == bfd_mach_h8300s);
+
+	  set_h8300h (mach == bfd_mach_h8300h || 
+		      mach == bfd_mach_h8300s ||
+		      mach == bfd_mach_h8300sx,
+		      mach == bfd_mach_h8300s ||
+		      mach == bfd_mach_h8300sx,
+		      mach == bfd_mach_h8300sx);
 	}
     }
 
@@ -2717,21 +4906,27 @@ sim_load (SIM_DESC sd, char *prog, bfd *abfd, int from_tty)
   else
     memory_size = H8300_MSIZE;
 
-  if (cpu.memory)
-    free (cpu.memory);
-  if (cpu.cache_idx)
-    free (cpu.cache_idx);
-  if (cpu.eightbit)
-    free (cpu.eightbit);
+  if (h8_get_memory_buf (sd))
+    free (h8_get_memory_buf (sd));
+  if (h8_get_cache_idx_buf (sd))
+    free (h8_get_cache_idx_buf (sd));
+  if (h8_get_eightbit_buf (sd))
+    free (h8_get_eightbit_buf (sd));
 
-  cpu.memory = (unsigned char *) calloc (sizeof (char), memory_size);
-  cpu.cache_idx = (unsigned short *) calloc (sizeof (short), memory_size);
-  cpu.eightbit = (unsigned char *) calloc (sizeof (char), 256);
+  h8_set_memory_buf (sd, (unsigned char *) 
+		     calloc (sizeof (char), memory_size));
+  h8_set_cache_idx_buf (sd, (unsigned short *) 
+			calloc (sizeof (short), memory_size));
+  h8_set_eightbit_buf (sd, (unsigned char *) calloc (sizeof (char), 256));
 
   /* `msize' must be a power of two.  */
   if ((memory_size & (memory_size - 1)) != 0)
-    abort ();
-  cpu.mask = memory_size - 1;
+    {
+      (*sim_callback->printf_filtered) (sim_callback, 
+					"sim_load: bad memory size.\n");
+      return SIM_RC_FAIL;
+    }
+  h8_set_mask (sd, memory_size - 1);
 
   if (sim_load_file (sd, myname, sim_callback, prog, prog_bfd,
 		     sim_kind == SIM_OPEN_DEBUG,
@@ -2756,11 +4951,11 @@ sim_create_inferior (SIM_DESC sd, struct bfd *abfd, char **argv, char **env)
   int i = 0;
   int len_arg = 0;
   int no_of_args = 0;
-  
+
   if (abfd != NULL)
-    cpu.pc = bfd_get_start_address (abfd);
+    h8_set_pc (sd, bfd_get_start_address (abfd));
   else
-    cpu.pc = 0;
+    h8_set_pc (sd, 0);
 
   /* Command Line support.  */
   if (argv != NULL)
@@ -2770,18 +4965,15 @@ sim_create_inferior (SIM_DESC sd, struct bfd *abfd, char **argv, char **env)
         continue;
 
       /* Allocating memory for the argv pointers.  */
-      ptr_command_line = (char **) malloc ((sizeof (char *))
-		         * (no_of_args + 1));
+      h8_set_command_line (sd, (char **) malloc ((sizeof (char *))
+						 * (no_of_args + 1)));
 
       for (i = 0; i < no_of_args; i++)
 	{
-	  /* Calculating the length of argument for allocating memory.  */
-	  len_arg = strlen (argv[i] + 1);
-	  ptr_command_line[i] = (char *) malloc (sizeof (char) * len_arg);
 	  /* Copying the argument string.  */
-	  ptr_command_line[i] = (char *) strdup (argv[i]);
+	  h8_set_cmdline_arg (sd, i, (char *) strdup (argv[i]));
 	}
-      ptr_command_line[i] = NULL;
+      h8_set_cmdline_arg (sd, i, NULL);
     }
   
   return SIM_RC_OK;
diff --git a/sim/h8300/sim-main.h b/sim/h8300/sim-main.h
new file mode 100644
index 0000000..11fc320
--- /dev/null
+++ b/sim/h8300/sim-main.h
@@ -0,0 +1,170 @@
+/* Main header for the Hitachi h8/300 architecture.  */
+
+#include "bfd.h"
+
+#ifndef SIM_MAIN_H
+#define SIM_MAIN_H
+
+#define DEBUG
+
+/* These define the size of main memory for the simulator.
+
+   Note the size of main memory for the H8/300H is only 256k.  Keeping it
+   small makes the simulator run much faster and consume less memory.
+
+   The linker knows about the limited size of the simulator's main memory
+   on the H8/300H (via the h8300h.sc linker script).  So if you change
+   H8300H_MSIZE, be sure to fix the linker script too.
+
+   Also note that there's a separate "eightbit" area aside from main
+   memory.  For simplicity, the simulator assumes any data memory reference
+   outside of main memory refers to the eightbit area (in theory, this
+   can only happen when simulating H8/300H programs).  We make no attempt
+   to catch overlapping addresses, wrapped addresses, etc etc.  */
+
+#define H8300_MSIZE (1 << 16)
+
+/* avolkov: 
+   Next 2 macros are ugly for any workstation, but while they're work.
+   Memory size MUST be configurable.  */
+#define H8300H_MSIZE (1 << 18) 
+#define H8300S_MSIZE (1 << 24) 
+
+#define CSIZE 1024
+
+enum h8_regnum {
+  R0_REGNUM = 0,
+  R1_REGNUM = 1,
+  R2_REGNUM = 2,
+  R3_REGNUM = 3,
+  R4_REGNUM = 4,
+  R5_REGNUM = 5,
+  R6_REGNUM = 6,
+  R7_REGNUM = 7,
+
+  SP_REGNUM = R7_REGNUM,	/* Contains address of top of stack */
+  FP_REGNUM = R6_REGNUM,	/* Contains address of executing
+				   stack frame */
+  CCR_REGNUM = 8,		/* Contains processor status */
+  PC_REGNUM  = 9,		/* Contains program counter */
+  CYCLE_REGNUM = 10,
+  EXR_REGNUM  = 11,
+  INST_REGNUM = 12,
+  TICK_REGNUM = 13,
+  SBR_REGNUM =  14, 
+  VBR_REGNUM =  15,
+  MACH_REGNUM = 16, 
+  MACL_REGNUM = 17,
+
+  ZERO_REGNUM = 18
+};
+
+enum h8_typecodes {
+  OP_NULL,
+  OP_REG,		/* Register direct.  */
+  OP_LOWREG,		/* Special reg syntax for "bra".  */
+  OP_DISP,		/* Register indirect w/displacement.  */
+  /* Note: h8300, h8300h, and h8300s permit only pre-decr and post-incr.  */
+  OP_PREDEC,		/* Register indirect w/pre-decrement.  */
+  OP_POSTDEC,		/* Register indirect w/post-decrement.  */
+  OP_PREINC,		/* Register indirect w/pre-increment.  */
+  OP_POSTINC,		/* Register indirect w/post-increment.  */
+  OP_PCREL,		/* PC Relative.  */
+  OP_MEM,		/* Absolute memory address.  */
+  OP_CCR,		/* Condition Code Register.  */
+  OP_IMM,		/* Immediate value.  */
+  /*OP_ABS*/		/* Un-used (duplicates op_mem?).  */
+  OP_EXR,		/* EXtended control Register.  */
+  OP_SBR, 		/* Vector Base Register.  */
+  OP_VBR,		/* Short-address Base Register.  */
+  OP_MACH,		/* Multiply Accumulator - high.  */
+  OP_MACL,		/* Multiply Accumulator - low.   */
+  /* FIXME: memory indirect?  */
+  OP_INDEXB,		/* Byte index mode */
+  OP_INDEXW,		/* Word index mode */
+  OP_INDEXL		/* Long index mode */
+};
+
+#include "sim-basics.h"
+
+/* Define sim_cia.  */
+typedef unsigned32 sim_cia;
+
+#include "sim-base.h"
+
+/* Structure used to describe addressing */
+
+typedef struct
+{
+  int type;
+  int reg;
+  int literal;
+} ea_type;
+
+/* Struct for instruction decoder.  */
+typedef struct
+{
+  ea_type src;
+  ea_type dst;
+  ea_type op3;
+  int opcode;
+  int next_pc;
+  int oldpc;
+  int cycles;
+#ifdef DEBUG
+  struct h8_opcode *op;
+#endif
+} decoded_inst;
+
+struct _sim_cpu {
+  unsigned int regs[20];	/* 8 GR's plus ZERO, SBR, and VBR.  */
+  unsigned int pc;
+
+  int macS;			/* MAC Saturating mode */
+  int macV;			/* MAC Overflow */
+  int macN;			/* MAC Negative */
+  int macZ;			/* MAC Zero     */
+
+  int delayed_branch;
+  char **command_line;		/* Pointer to command line arguments.  */
+
+  unsigned char *memory;
+  unsigned char *eightbit;
+  int mask;
+  
+  sim_cpu_base base;
+};
+
+/* The sim_state struct.  */
+struct sim_state {
+  struct _sim_cpu *cpu;
+  unsigned int sim_cache_size;
+  decoded_inst *sim_cache;
+  unsigned short *cache_idx;
+  unsigned long memory_size;
+  int cache_top;
+  int compiles;
+#ifdef ADEBUG
+  int stats[O_LAST];
+#endif
+  sim_state_base base;
+};
+
+/* The current state of the processor; registers, memory, etc.  */
+
+#define CIA_GET(CPU)		(cpu_get_pc (CPU))
+#define CIA_SET(CPU, VAL)	(cpu_set_pc ((CPU), (VAL)))
+#define STATE_CPU(SD, N)	((SD)->cpu)	/* Single Processor.  */
+#define cpu_set_pc(CPU, VAL)	(((CPU)->pc)  = (VAL))
+#define cpu_get_pc(CPU)		(((CPU)->pc))
+
+/* Magic numbers used to distinguish an exit from a breakpoint.  */
+#define LIBC_EXIT_MAGIC1 0xdead	
+#define LIBC_EXIT_MAGIC2 0xbeef	
+/* Local version of macros for decoding exit status.  
+   (included here rather than try to find target version of wait.h)
+*/
+#define SIM_WIFEXITED(V) (((V) & 0xff) == 0)
+#define SIM_WEXITSTATUS(V) ((V) >> 8)
+
+#endif /* SIM_MAIN_H */