sim: d10v: convert to common sim engine logic

Now that we have access to the sim state everywhere, we can convert to
the common engine logic for overall processing.  This frees us up from
tracking exception state ourselves.

5 files changed, 137 insertions, 218 deletions

diff --git a/sim/d10v/ChangeLog b/sim/d10v/ChangeLog
index 2db4312..e26ef6c 100644
--- a/sim/d10v/ChangeLog
+++ b/sim/d10v/ChangeLog
@@ -1,5 +1,35 @@
 2015-11-15  Mike Frysinger  <vapier@gentoo.org>
 
+	* Makefile.in (SIM_OBJS): Add sim-reason.o, sim-resume.o, and
+	sim-stop.o.
+	* d10v_sim.h (struct d10v_memory): Delete fault member.
+	(struct _state): Delete exception member.
+	* interp.c (lookup_hash): Call sim_engine_halt instead of setting
+	State.exception.
+	(do_2_short, do_parallel): Delete State.exception checks.
+	(sim_size): Mark static.
+	(map_memory): Call sim_engine_halt instead of returning fault.
+	Call xcalloc instead of calloc and checking the return.
+	(dmem_addr): Call sim_engine_halt when phys_size is 0.
+	(imem_addr): Likewise.
+	(stop_simulator, sim_stop, sim_stop_reason): Delete.
+	(sim_resume): Rename to ...
+	(step_once): ... this.  Delete State.exception code and move
+	siggnal checking to sim_engine_run.
+	(sim_engine_run): New function.
+	* simops.c (EXCEPTION): Define.
+	(move_to_cr): Call EXCEPTION instead of setting State.exception.
+	(OP_30000000, OP_6401, OP_6001, OP_6000, OP_32010000, OP_31000000,
+	OP_6601, OP_6201, OP_6200, OP_33010000, OP_5201, OP_27000000,
+	OP_2F000000, OP_3220, OP_3200, OP_3400, OP_3000, OP_34000000,
+	OP_6800, OP_6C1F, OP_6801, OP_6C01, OP_36010000, OP_35000000,
+	OP_6A00, OP_6E1F, OP_6A01, OP_6E01, OP_37010000, OP_5FE0): Likewise.
+	(OP_5F20): Call sim_engine_halt instead of setting State.exception.
+	(OP_5F00): Call sim_engine_halt and EXCEPTION instead of setting
+	State.exception.
+
+2015-11-15  Mike Frysinger  <vapier@gentoo.org>
+
 	* d10v_sim.h (struct simops): Add SIM_DESC and SIM_CPU to func args.
 	(SET_CREG, SET_HW_CREG, SET_PSW_BIT): Pass sd and cpu to move_to_cr.
 	(dmem_addr, imem_addr, move_to_cr): Add SIM_DESC and SIM_CPU args.
diff --git a/sim/d10v/Makefile.in b/sim/d10v/Makefile.in
index 27b0008..a6100de 100644
--- a/sim/d10v/Makefile.in
+++ b/sim/d10v/Makefile.in
@@ -21,6 +21,9 @@ SIM_OBJS = \
 	interp.o \
 	$(SIM_NEW_COMMON_OBJS) \
 	sim-hload.o \
+	sim-reason.o \
+	sim-resume.o \
+	sim-stop.o \
 	table.o \
 	simops.o \
 	endian.o
diff --git a/sim/d10v/d10v_sim.h b/sim/d10v/d10v_sim.h
index ed2bbbb..e2d2111 100644
--- a/sim/d10v/d10v_sim.h
+++ b/sim/d10v/d10v_sim.h
@@ -226,7 +226,6 @@ struct d10v_memory
   uint8 *insn[IMEM_SEGMENTS];
   uint8 *data[DMEM_SEGMENTS];
   uint8 *unif[UMEM_SEGMENTS];
-  uint8 fault[16];
 };
 
 struct _state
@@ -262,7 +261,6 @@ struct _state
   } trace;
 
   uint8 exe;
-  int	exception;
   int	pc_changed;
 
   /* NOTE: everything below this line is not reset by
diff --git a/sim/d10v/interp.c b/sim/d10v/interp.c
index df8b929..263156e 100644
--- a/sim/d10v/interp.c
+++ b/sim/d10v/interp.c
@@ -79,11 +79,7 @@ lookup_hash (SIM_DESC sd, SIM_CPU *cpu, uint32 ins, int size)
   while ((ins & h->mask) != h->opcode || h->size != size)
     {
       if (h->next == NULL)
-	{
-	  State.exception = GDB_SIGNAL_ILL;
-	  State.pc_changed = 1; /* Don't increment the PC. */
-	  return NULL;
-	}
+	sim_engine_halt (sd, cpu, NULL, PC, sim_stopped, SIM_SIGILL);
       h = h->next;
     }
   return (h);
@@ -159,7 +155,7 @@ do_2_short (SIM_DESC sd, SIM_CPU *cpu, uint16 ins1, uint16 ins2, enum _leftright
   (h->ops->func) (sd, cpu);
 
   /* Issue the second instruction (if the PC hasn't changed) */
-  if (!State.pc_changed && !State.exception)
+  if (!State.pc_changed)
     {
       /* finish any existing instructions */
       SLOT_FLUSH ();
@@ -172,7 +168,7 @@ do_2_short (SIM_DESC sd, SIM_CPU *cpu, uint16 ins1, uint16 ins2, enum _leftright
       ins_type_counters[ (int)INS_CYCLES ]++;
       (h->ops->func) (sd, cpu);
     }
-  else if (!State.exception)
+  else
     ins_type_counters[ (int)INS_COND_JUMP ]++;
 }
 
@@ -232,13 +228,10 @@ do_parallel (SIM_DESC sd, SIM_CPU *cpu, uint16 ins1, uint16 ins2)
       State.ins_type = INS_LEFT_PARALLEL;
       ins_type_counters[ (int)State.ins_type ]++;
       (h1->ops->func) (sd, cpu);
-      if (!State.exception)
-	{
-	  get_operands (h2->ops, ins2);
-	  State.ins_type = INS_RIGHT_PARALLEL;
-	  ins_type_counters[ (int)State.ins_type ]++;
-	  (h2->ops->func) (sd, cpu);
-	}
+      get_operands (h2->ops, ins2);
+      State.ins_type = INS_RIGHT_PARALLEL;
+      ins_type_counters[ (int)State.ins_type ]++;
+      (h2->ops->func) (sd, cpu);
     }
 }
  
@@ -262,7 +255,7 @@ add_commas (char *buf, int sizeof_buf, unsigned long value)
   return endbuf;
 }
 
-void
+static void
 sim_size (int power)
 {
   int i;
@@ -655,18 +648,11 @@ map_memory (SIM_DESC sd, SIM_CPU *cpu, unsigned phys_addr)
     default:
       /* OOPS! */
       last_segname = "scrap";
-      return State.mem.fault;
+      sim_engine_halt (sd, cpu, NULL, PC, sim_stopped, SIM_SIGBUS);
     }
   
   if (*memory == NULL)
-    {
-      *memory = calloc (1, SEGMENT_SIZE);
-      if (*memory == NULL)
-	{
-	  (*d10v_callback->printf_filtered) (d10v_callback, "Malloc failed.\n");
-	  return State.mem.fault;
-	}
-    }
+    *memory = xcalloc (1, SEGMENT_SIZE);
   
   offset = (phys_addr % SEGMENT_SIZE);
   raw = *memory + offset;
@@ -893,11 +879,8 @@ dmem_addr (SIM_DESC sd, SIM_CPU *cpu, uint16 offset)
   phys_size = sim_d10v_translate_dmap_addr (sd, cpu, offset, 1, &phys, NULL,
 					    dmap_register);
   if (phys_size == 0)
-    {
-      mem = State.mem.fault;
-    }
-  else
-    mem = map_memory (sd, cpu, phys);
+    sim_engine_halt (sd, cpu, NULL, PC, sim_stopped, SIM_SIGBUS);
+  mem = map_memory (sd, cpu, phys);
 #ifdef DEBUG
   if ((d10v_debug & DEBUG_MEMORY))
     {
@@ -920,9 +903,7 @@ imem_addr (SIM_DESC sd, SIM_CPU *cpu, uint32 offset)
   int phys_size = sim_d10v_translate_imap_addr (sd, cpu, offset, 1, &phys, NULL,
 						imap_register);
   if (phys_size == 0)
-    {
-      return State.mem.fault;
-    }
+    sim_engine_halt (sd, cpu, NULL, PC, sim_stopped, SIM_SIGBUS);
   mem = map_memory (sd, cpu, phys);
 #ifdef DEBUG
   if ((d10v_debug & DEBUG_MEMORY))
@@ -938,60 +919,15 @@ imem_addr (SIM_DESC sd, SIM_CPU *cpu, uint32 offset)
   return mem;
 }
 
-static int stop_simulator = 0;
-
-int
-sim_stop (SIM_DESC sd)
-{
-  stop_simulator = 1;
-  return 1;
-}
-
-
-/* Run (or resume) the program.  */
-void
-sim_resume (SIM_DESC sd, int step, int siggnal)
+static void
+step_once (SIM_DESC sd, SIM_CPU *cpu)
 {
-  SIM_CPU *cpu = STATE_CPU (sd, 0);
   uint32 inst;
   uint8 *iaddr;
 
-/*   (*d10v_callback->printf_filtered) (d10v_callback, "sim_resume (%d,%d)  PC=0x%x\n",step,siggnal,PC); */
-  State.exception = 0;
-  if (step)
-    sim_stop (sd);
-
-  switch (siggnal)
-    {
-    case 0:
-      break;
-    case GDB_SIGNAL_BUS:
-      SET_BPC (PC);
-      SET_BPSW (PSW);
-      SET_HW_PSW ((PSW & (PSW_F0_BIT | PSW_F1_BIT | PSW_C_BIT)));
-      JMP (AE_VECTOR_START);
-      SLOT_FLUSH ();
-      break;
-    case GDB_SIGNAL_ILL:
-      SET_BPC (PC);
-      SET_BPSW (PSW);
-      SET_HW_PSW ((PSW & (PSW_F0_BIT | PSW_F1_BIT | PSW_C_BIT)));
-      JMP (RIE_VECTOR_START);
-      SLOT_FLUSH ();
-      break;
-    default:
-      /* just ignore it */
-      break;
-    }
-
-  do
+  /* TODO: Unindent this block.  */
     {
       iaddr = imem_addr (sd, cpu, (uint32)PC << 2);
-      if (iaddr == State.mem.fault)
- 	{
-	  State.exception = GDB_SIGNAL_BUS;
- 	  break;
- 	}
  
       inst = get_longword( iaddr ); 
  
@@ -1058,10 +994,49 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
       /* Writeback all the DATA / PC changes */
       SLOT_FLUSH ();
     }
-  while ( !State.exception && !stop_simulator);
-  
-  if (step && !State.exception)
-    State.exception = GDB_SIGNAL_TRAP;
+}
+
+void
+sim_engine_run (SIM_DESC sd,
+		int next_cpu_nr,  /* ignore  */
+		int nr_cpus,      /* ignore  */
+		int siggnal)
+{
+  sim_cpu *cpu;
+
+  SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
+
+  cpu = STATE_CPU (sd, 0);
+
+  switch (siggnal)
+    {
+    case 0:
+      break;
+    case GDB_SIGNAL_BUS:
+      SET_BPC (PC);
+      SET_BPSW (PSW);
+      SET_HW_PSW ((PSW & (PSW_F0_BIT | PSW_F1_BIT | PSW_C_BIT)));
+      JMP (AE_VECTOR_START);
+      SLOT_FLUSH ();
+      break;
+    case GDB_SIGNAL_ILL:
+      SET_BPC (PC);
+      SET_BPSW (PSW);
+      SET_HW_PSW ((PSW & (PSW_F0_BIT | PSW_F1_BIT | PSW_C_BIT)));
+      JMP (RIE_VECTOR_START);
+      SLOT_FLUSH ();
+      break;
+    default:
+      /* just ignore it */
+      break;
+    }
+
+  while (1)
+    {
+      step_once (sd, cpu);
+      if (sim_events_tick (sd))
+	sim_events_process (sd);
+    }
 }
 
 void
@@ -1226,40 +1201,6 @@ sim_create_inferior (SIM_DESC sd, struct bfd *abfd, char **argv, char **env)
   return SIM_RC_OK;
 }
 
-void
-sim_stop_reason (SIM_DESC sd, enum sim_stop *reason, int *sigrc)
-{
-/*   (*d10v_callback->printf_filtered) (d10v_callback, "sim_stop_reason:  PC=0x%x\n",PC<<2); */
-
-  switch (State.exception)
-    {
-    case SIG_D10V_STOP:			/* stop instruction */
-      *reason = sim_exited;
-      *sigrc = 0;
-      break;
-
-    case SIG_D10V_EXIT:			/* exit trap */
-      *reason = sim_exited;
-      *sigrc = GPR (0);
-      break;
-
-    case SIG_D10V_BUS:
-      *reason = sim_stopped;
-      *sigrc = GDB_SIGNAL_BUS;
-      break;
-
-    default:				/* some signal */
-      *reason = sim_stopped;
-      if (stop_simulator && !State.exception)
-	*sigrc = GDB_SIGNAL_INT;
-      else
-	*sigrc = State.exception;
-      break;
-    }
-
-  stop_simulator = 0;
-}
-
 int
 sim_fetch_register (SIM_DESC sd, int rn, unsigned char *memory, int length)
 {
diff --git a/sim/d10v/simops.c b/sim/d10v/simops.c
index 28044f6..6eb1a20 100644
--- a/sim/d10v/simops.c
+++ b/sim/d10v/simops.c
@@ -15,6 +15,8 @@
 #include "simops.h"
 #include "targ-vals.h"
 
+#define EXCEPTION(sig) sim_engine_halt (sd, cpu, NULL, PC, sim_stopped, sig)
+
 enum op_types {
   OP_VOID,
   OP_REG,
@@ -92,7 +94,7 @@ move_to_cr (SIM_DESC sd, SIM_CPU *cpu, int cr, reg_t mask, reg_t val, int psw_hw
 		(d10v_callback,
 		 "ERROR at PC 0x%x: ST can only be set when FX is set.\n",
 		 PC<<2);
-	      State.exception = SIGILL;
+	      EXCEPTION (SIM_SIGILL);
 	    }
 	}
       /* keep an up-to-date psw around for tracing */
@@ -1138,9 +1140,7 @@ OP_5F20 (SIM_DESC sd, SIM_CPU *cpu)
       trace_output_void (sd);
     }
   else
-    {
-      State.exception = SIGTRAP;
-    }
+    sim_engine_halt (sd, cpu, NULL, PC, sim_stopped, SIM_SIGTRAP);
 }
 
 /* divs */
@@ -1320,10 +1320,8 @@ OP_30000000 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("ld", OP_REG_OUTPUT, OP_MEMREF2, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   tmp = RW (addr);
   SET_GPR (OP[0], tmp);
@@ -1339,10 +1337,8 @@ OP_6401 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("ld", OP_REG_OUTPUT, OP_POSTDEC, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   tmp = RW (addr);
   SET_GPR (OP[0], tmp);
@@ -1360,10 +1356,8 @@ OP_6001 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("ld", OP_REG_OUTPUT, OP_POSTINC, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   tmp = RW (addr);
   SET_GPR (OP[0], tmp);
@@ -1381,10 +1375,8 @@ OP_6000 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("ld", OP_REG_OUTPUT, OP_MEMREF, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   tmp = RW (addr);
   SET_GPR (OP[0], tmp);
@@ -1400,10 +1392,8 @@ OP_32010000 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("ld", OP_REG_OUTPUT, OP_MEMREF3, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   tmp = RW (addr);
   SET_GPR (OP[0], tmp);
@@ -1419,10 +1409,8 @@ OP_31000000 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("ld2w", OP_REG_OUTPUT, OP_MEMREF2, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   tmp = RLW (addr);
   SET_GPR32 (OP[0], tmp);
@@ -1438,10 +1426,8 @@ OP_6601 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("ld2w", OP_REG_OUTPUT, OP_POSTDEC, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   tmp = RLW (addr);
   SET_GPR32 (OP[0], tmp);
@@ -1459,10 +1445,8 @@ OP_6201 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("ld2w", OP_REG_OUTPUT, OP_POSTINC, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   tmp = RLW (addr);
   SET_GPR32 (OP[0], tmp);
@@ -1480,10 +1464,8 @@ OP_6200 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("ld2w", OP_REG_OUTPUT, OP_MEMREF, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   tmp = RLW (addr);
   SET_GPR32 (OP[0], tmp);
@@ -1499,10 +1481,8 @@ OP_33010000 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("ld2w", OP_REG_OUTPUT, OP_MEMREF3, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   tmp = RLW (addr);
   SET_GPR32 (OP[0], tmp);
@@ -2225,7 +2205,7 @@ OP_5201 (SIM_DESC sd, SIM_CPU *cpu)
       (*d10v_callback->printf_filtered) (d10v_callback,
 					 "ERROR at PC 0x%x: instruction only valid for A0\n",
 					 PC<<2);
-      State.exception = SIGILL;
+      EXCEPTION (SIM_SIGILL);
     }
 
   SET_PSW_F1 (PSW_F0);
@@ -2300,12 +2280,12 @@ OP_27000000 (SIM_DESC sd, SIM_CPU *cpu)
   if (GPR (OP[0]) == 0)
     {
       (*d10v_callback->printf_filtered) (d10v_callback, "ERROR: rep with count=0 is illegal.\n");
-      State.exception = SIGILL;
+      EXCEPTION (SIM_SIGILL);
     }
   if (OP[1] < 4)
     {
       (*d10v_callback->printf_filtered) (d10v_callback, "ERROR: rep must include at least 4 instructions.\n");
-      State.exception = SIGILL;
+      EXCEPTION (SIM_SIGILL);
     }
   trace_output_void (sd);
 }
@@ -2322,12 +2302,12 @@ OP_2F000000 (SIM_DESC sd, SIM_CPU *cpu)
   if (OP[0] == 0)
     {
       (*d10v_callback->printf_filtered) (d10v_callback, "ERROR: repi with count=0 is illegal.\n");
-      State.exception = SIGILL;
+      EXCEPTION (SIM_SIGILL);
     }
   if (OP[1] < 4)
     {
       (*d10v_callback->printf_filtered) (d10v_callback, "ERROR: repi must include at least 4 instructions.\n");
-      State.exception = SIGILL;
+      EXCEPTION (SIM_SIGILL);
     }
   trace_output_void (sd);
 }
@@ -2476,8 +2456,7 @@ OP_3220 (SIM_DESC sd, SIM_CPU *cpu)
   if (reg >= 17 || reg <= -17)
     {
       (*d10v_callback->printf_filtered) (d10v_callback, "ERROR: shift value %d too large.\n", reg);
-      State.exception = SIGILL;
-      return;
+      EXCEPTION (SIM_SIGILL);
     }
 
   tmp = SEXT40 (ACC (OP[0]));
@@ -2485,8 +2464,7 @@ OP_3220 (SIM_DESC sd, SIM_CPU *cpu)
   if (PSW_ST && (tmp < SEXT40 (MIN32) || tmp > SEXT40 (MAX32)))
     {
       (*d10v_callback->printf_filtered) (d10v_callback, "ERROR: accumulator value 0x%.2x%.8lx out of range\n", ((int)(tmp >> 32) & 0xff), ((unsigned long) tmp) & 0xffffffff);
-      State.exception = SIGILL;
-      return;
+      EXCEPTION (SIM_SIGILL);
     }
 
   if (reg >= 0 && reg <= 16)
@@ -2545,8 +2523,7 @@ OP_3200 (SIM_DESC sd, SIM_CPU *cpu)
   else
     {
       (*d10v_callback->printf_filtered) (d10v_callback, "ERROR: shift value %d too large.\n", GPR (OP[1]) & 31);
-      State.exception = SIGILL;
-      return;
+      EXCEPTION (SIM_SIGILL);
     }
 
   if (PSW_ST)
@@ -2638,8 +2615,7 @@ OP_3400 (SIM_DESC sd, SIM_CPU *cpu)
   else
     {
       (*d10v_callback->printf_filtered) (d10v_callback, "ERROR: shift value %d too large.\n", GPR (OP[1]) & 31);
-      State.exception = SIGILL;
-      return;
+      EXCEPTION (SIM_SIGILL);
     }
 }
 
@@ -2693,8 +2669,7 @@ OP_3000 (SIM_DESC sd, SIM_CPU *cpu)
   else
     {
       (*d10v_callback->printf_filtered) (d10v_callback, "ERROR: shift value %d too large.\n", GPR (OP[1]) & 31);
-      State.exception = SIGILL;
-      return;
+      EXCEPTION (SIM_SIGILL);
     }
 
 }
@@ -2744,10 +2719,8 @@ OP_34000000 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("st", OP_REG, OP_MEMREF2, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   SW (addr, GPR (OP[0]));
   trace_output_void (sd);
@@ -2761,10 +2734,8 @@ OP_6800 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("st", OP_REG, OP_MEMREF, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   SW (addr, GPR (OP[0]));
   trace_output_void (sd);
@@ -2780,15 +2751,12 @@ OP_6C1F (SIM_DESC sd, SIM_CPU *cpu)
   if (OP[1] != 15)
     {
       (*d10v_callback->printf_filtered) (d10v_callback, "ERROR: cannot pre-decrement any registers but r15 (SP).\n");
-      State.exception = SIGILL;
-      return;
+      EXCEPTION (SIM_SIGILL);
     }
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   SW (addr, GPR (OP[0]));
   SET_GPR (OP[1], addr);
@@ -2803,10 +2771,8 @@ OP_6801 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("st", OP_REG, OP_POSTINC, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   SW (addr, GPR (OP[0]));
   INC_ADDR (OP[1], 2);
@@ -2822,15 +2788,12 @@ OP_6C01 (SIM_DESC sd, SIM_CPU *cpu)
   if ( OP[1] == 15 )
     {
       (*d10v_callback->printf_filtered) (d10v_callback, "ERROR: cannot post-decrement register r15 (SP).\n");
-      State.exception = SIGILL;
-      return;
+      EXCEPTION (SIM_SIGILL);
     }
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   SW (addr, GPR (OP[0]));
   INC_ADDR (OP[1], -2);
@@ -2845,10 +2808,8 @@ OP_36010000 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("st", OP_REG, OP_MEMREF3, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   SW (addr, GPR (OP[0]));
   trace_output_void (sd);
@@ -2862,10 +2823,8 @@ OP_35000000 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("st2w", OP_DREG, OP_MEMREF2, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   SW (addr + 0, GPR (OP[0] + 0));
   SW (addr + 2, GPR (OP[0] + 1));
@@ -2880,10 +2839,8 @@ OP_6A00 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("st2w", OP_DREG, OP_MEMREF, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   SW (addr + 0, GPR (OP[0] + 0));
   SW (addr + 2, GPR (OP[0] + 1));
@@ -2899,15 +2856,12 @@ OP_6E1F (SIM_DESC sd, SIM_CPU *cpu)
   if ( OP[1] != 15 )
     {
       (*d10v_callback->printf_filtered) (d10v_callback, "ERROR: cannot pre-decrement any registers but r15 (SP).\n");
-      State.exception = SIGILL;
-      return;
+      EXCEPTION (SIM_SIGILL);
     }
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   SW (addr + 0, GPR (OP[0] + 0));
   SW (addr + 2, GPR (OP[0] + 1));
@@ -2923,10 +2877,8 @@ OP_6A01 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("st2w", OP_DREG, OP_POSTINC, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   SW (addr + 0, GPR (OP[0] + 0));
   SW (addr + 2, GPR (OP[0] + 1));
@@ -2943,15 +2895,12 @@ OP_6E01 (SIM_DESC sd, SIM_CPU *cpu)
   if ( OP[1] == 15 )
     {
       (*d10v_callback->printf_filtered) (d10v_callback, "ERROR: cannot post-decrement register r15 (SP).\n");
-      State.exception = SIGILL;
-      return;
+      EXCEPTION (SIM_SIGILL);
     }
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   SW (addr + 0, GPR (OP[0] + 0));
   SW (addr + 2, GPR (OP[0] + 1));
@@ -2967,10 +2916,8 @@ OP_37010000 (SIM_DESC sd, SIM_CPU *cpu)
   trace_input ("st2w", OP_DREG, OP_MEMREF3, OP_VOID);
   if ((addr & 1))
     {
-      State.exception = SIG_D10V_BUS;
-      State.pc_changed = 1; /* Don't increment the PC. */
       trace_output_void (sd);
-      return;
+      EXCEPTION (SIM_SIGBUS);
     }
   SW (addr + 0, GPR (OP[0] + 0));
   SW (addr + 2, GPR (OP[0] + 1));
@@ -3000,8 +2947,8 @@ void
 OP_5FE0 (SIM_DESC sd, SIM_CPU *cpu)
 {
   trace_input ("stop", OP_VOID, OP_VOID, OP_VOID);
-  State.exception = SIG_D10V_STOP;
   trace_output_void (sd);
+  sim_engine_halt (sd, cpu, NULL, PC, sim_exited, 0);
 }
 
 /* sub */
@@ -3276,7 +3223,7 @@ OP_5F00 (SIM_DESC sd, SIM_CPU *cpu)
 	    if (PARM1 == getpid ())
 	      {
 		trace_output_void (sd);
-		State.exception = PARM2;
+		sim_engine_halt (sd, cpu, NULL, PC, sim_stopped, PARM2);
 	      }
 	    else
 	      {
@@ -3389,7 +3336,7 @@ OP_5F00 (SIM_DESC sd, SIM_CPU *cpu)
 		    trace_output_void (sd);
 		    (*d10v_callback->printf_filtered) (d10v_callback, "Unknown signal %d\n", PARM2);
 		    (*d10v_callback->flush_stdout) (d10v_callback);
-		    State.exception = SIGILL;
+		    EXCEPTION (SIM_SIGILL);
 		  }
 		else
 		  {
@@ -3453,7 +3400,7 @@ OP_5F00 (SIM_DESC sd, SIM_CPU *cpu)
 	  case TARGET_SYS_kill:
 	    trace_input ("<kill>", OP_REG, OP_REG, OP_VOID);
 	    trace_output_void (sd);
-	    State.exception = PARM2;
+	    sim_engine_halt (sd, cpu, NULL, PC, sim_stopped, PARM2);
 	    break;
 #endif
 
@@ -3498,8 +3445,8 @@ OP_5F00 (SIM_DESC sd, SIM_CPU *cpu)
 
 	  case TARGET_SYS_exit:
 	    trace_input ("<exit>", OP_R0, OP_VOID, OP_VOID);
-	    State.exception = SIG_D10V_EXIT;
 	    trace_output_void (sd);
+	    sim_engine_halt (sd, cpu, NULL, PC, sim_exited, GPR (0));
 	    break;
 
 #ifdef TARGET_SYS_stat