Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 905 insertions, 0 deletions

diff --git a/sim/common/hw-properties.c b/sim/common/hw-properties.c
new file mode 100644
index 0000000..a1e9291
--- /dev/null
+++ b/sim/common/hw-properties.c
@@ -0,0 +1,905 @@
+/*  This file is part of the program psim.
+
+    Copyright (C) 1994-1998, Andrew Cagney <cagney@highland.com.au>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+ 
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ 
+    */
+
+#include "hw-main.h"
+#include "hw-base.h"
+
+#include "sim-assert.h"
+
+#ifdef HAVE_STRING_H
+#include <string.h>
+#else
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+#endif
+
+#define TRACE(A,B)
+
+/* property entries */
+
+struct hw_property_data {
+  struct hw_property_data *next;
+  struct hw_property *property;
+  const void *init_array;
+  unsigned sizeof_init_array;
+};
+
+void
+create_hw_property_data (struct hw *me)
+{
+}
+
+void
+delete_hw_property_data (struct hw *me)
+{
+}
+
+
+/* Device Properties: */
+
+static struct hw_property_data *
+find_property_data (struct hw *me,
+		    const char *property)
+{
+  struct hw_property_data *entry;
+  ASSERT (property != NULL);
+  entry = me->properties_of_hw;
+  while (entry != NULL)
+    {
+      if (strcmp (entry->property->name, property) == 0)
+	return entry;
+      entry = entry->next;
+    }
+  return NULL;
+}
+
+
+static void
+hw_add_property (struct hw *me,
+		 const char *property,
+		 hw_property_type type,
+		 const void *init_array,
+		 unsigned sizeof_init_array,
+		 const void *array,
+		 unsigned sizeof_array,
+		 const struct hw_property *original,
+		 object_disposition disposition)
+{
+  struct hw_property_data *new_entry = NULL;
+  struct hw_property *new_value = NULL;
+  
+  /* find the list end */
+  struct hw_property_data **insertion_point = &me->properties_of_hw;
+  while (*insertion_point != NULL)
+    {
+      if (strcmp ((*insertion_point)->property->name, property) == 0)
+	return;
+      insertion_point = &(*insertion_point)->next;
+    }
+  
+  /* create a new value */
+  new_value = HW_ZALLOC (me, struct hw_property);
+  new_value->name = (char *) strdup (property);
+  new_value->type = type;
+  if (sizeof_array > 0)
+    {
+      void *new_array = hw_zalloc (me, sizeof_array);
+      memcpy (new_array, array, sizeof_array);
+      new_value->array = new_array;
+      new_value->sizeof_array = sizeof_array;
+    }
+  new_value->owner = me;
+  new_value->original = original;
+  new_value->disposition = disposition;
+  
+  /* insert the value into the list */
+  new_entry = HW_ZALLOC (me, struct hw_property_data);
+  *insertion_point = new_entry;
+  if (sizeof_init_array > 0)
+    {
+      void *new_init_array = hw_zalloc (me, sizeof_init_array);
+      memcpy (new_init_array, init_array, sizeof_init_array);
+      new_entry->init_array = new_init_array;
+      new_entry->sizeof_init_array = sizeof_init_array;
+    }
+  new_entry->property = new_value;
+}
+
+
+static void
+hw_set_property (struct hw *me,
+		 const char *property,
+		 hw_property_type type,
+		 const void *array,
+		 int sizeof_array)
+{
+  /* find the property */
+  struct hw_property_data *entry = find_property_data (me, property);
+  if (entry != NULL)
+    {
+      /* existing property - update it */
+      void *new_array = 0;
+      struct hw_property *value = entry->property;
+      /* check the type matches */
+      if (value->type != type)
+	hw_abort (me, "conflict between type of new and old value for property %s", property);
+      /* replace its value */
+      if (value->array != NULL)
+	hw_free (me, (void*)value->array);
+      new_array = (sizeof_array > 0
+		   ? hw_zalloc (me, sizeof_array)
+		   : (void*)0);
+      value->array = new_array;
+      value->sizeof_array = sizeof_array;
+      if (sizeof_array > 0)
+	memcpy (new_array, array, sizeof_array);
+      return;
+    }
+  else
+    {
+      /* new property - create it */
+      hw_add_property (me, property, type,
+		       NULL, 0, array, sizeof_array,
+		       NULL, temporary_object);
+    }
+}
+
+
+#if 0
+static void
+clean_hw_properties (struct hw *me)
+{
+  struct hw_property_data **delete_point = &me->properties_of_hw;
+  while (*delete_point != NULL)
+    {
+      struct hw_property_data *current = *delete_point;
+      switch (current->property->disposition)
+	{
+	case permenant_object:
+	  /* zap the current value, will be initialized later */
+	  ASSERT (current->init_array != NULL);
+	  if (current->property->array != NULL)
+	    {
+	      hw_free (me, (void*)current->property->array);
+	      current->property->array = NULL;
+	    }
+	  delete_point = &(*delete_point)->next;
+	  break;
+	case temporary_object:
+	  /* zap the actual property, was created during simulation run */
+	  ASSERT (current->init_array == NULL);
+	  *delete_point = current->next;
+	  if (current->property->array != NULL)
+	    hw_free (me, (void*)current->property->array);
+	  hw_free (me, current->property);
+	  hw_free (me, current);
+	  break;
+	}
+    }
+}
+#endif
+
+#if 0
+void
+hw_init_static_properties (SIM_DESC sd,
+			   struct hw *me,
+			   void *data)
+{
+  struct hw_property_data *property;
+  for (property = me->properties_of_hw;
+       property != NULL;
+       property = property->next)
+    {
+      ASSERT (property->init_array != NULL);
+      ASSERT (property->property->array == NULL);
+      ASSERT(property->property->disposition == permenant_object);
+      switch (property->property->type)
+	{
+	case array_property:
+	case boolean_property:
+	case range_array_property:
+	case reg_array_property:
+	case string_property:
+	case string_array_property:
+	case integer_property:
+	  /* delete the property, and replace it with the original */
+	  hw_set_property (me, property->property->name,
+			   property->property->type,
+			   property->init_array,
+			   property->sizeof_init_array);
+	  break;
+#if 0
+	case ihandle_property:
+	  break;
+#endif
+	}
+    }
+}
+#endif
+
+
+#if 0
+void
+hw_init_runtime_properties (SIM_DESC sd,
+			    struct hw *me,
+			    void *data)
+{
+  struct hw_property_data *property;
+  for (property = me->properties_of_hw;
+       property != NULL;
+       property = property->next)
+    {
+      switch (property->property->disposition)
+	{
+	case permenant_object:
+	  switch (property->property->type)
+	    {
+#if 0
+	    case ihandle_property:
+	      {
+		struct hw_instance *ihandle;
+		ihandle_runtime_property_spec spec;
+		ASSERT (property->init_array != NULL);
+		ASSERT (property->property->array == NULL);
+		hw_find_ihandle_runtime_property (me, property->property->name, &spec);
+		ihandle = tree_instance (me, spec.full_path);
+		hw_set_ihandle_property (me, property->property->name, ihandle);
+		break;
+	      }
+#endif
+	    case array_property:
+	    case boolean_property:
+	    case range_array_property:
+	    case integer_property:
+	    case reg_array_property:
+	    case string_property:
+	    case string_array_property:
+	      ASSERT (property->init_array != NULL);
+	      ASSERT (property->property->array != NULL);
+	      break;
+	    }
+	  break;
+	case temporary_object:
+	  ASSERT (property->init_array == NULL);
+	  ASSERT (property->property->array != NULL);
+	  break;
+	}
+    }
+}
+#endif
+
+
+
+const struct hw_property *
+hw_next_property (const struct hw_property *property)
+{
+  /* find the property in the list */
+  struct hw *owner = property->owner;
+  struct hw_property_data *entry = owner->properties_of_hw;
+  while (entry != NULL && entry->property != property)
+    entry = entry->next;
+  /* now return the following property */
+  ASSERT (entry != NULL); /* must be a member! */
+  if (entry->next != NULL)
+    return entry->next->property;
+  else
+    return NULL;
+}
+
+
+const struct hw_property *
+hw_find_property (struct hw *me,
+		  const char *property)
+{
+  if (me == NULL)
+    {
+      return NULL;
+    }
+  else if (property == NULL || strcmp (property, "") == 0)
+    {
+      if (me->properties_of_hw == NULL)
+	return NULL;
+      else
+	return me->properties_of_hw->property;
+    }
+  else
+    {
+      struct hw_property_data *entry = find_property_data (me, property);
+      if (entry != NULL)
+	return entry->property;
+    }
+  return NULL;
+}
+
+
+void
+hw_add_array_property (struct hw *me,
+		       const char *property,
+		       const void *array,
+		       int sizeof_array)
+{
+  hw_add_property (me, property, array_property,
+		   array, sizeof_array, array, sizeof_array,
+		   NULL, permenant_object);
+}
+
+void
+hw_set_array_property (struct hw *me,
+		       const char *property,
+		       const void *array,
+		       int sizeof_array)
+{
+  hw_set_property (me, property, array_property, array, sizeof_array);
+}
+
+const struct hw_property *
+hw_find_array_property (struct hw *me,
+			const char *property)
+{
+  const struct hw_property *node;
+  node = hw_find_property (me, property);
+  if (node == NULL)
+    hw_abort (me, "property \"%s\" not found", property);
+  if (node->type != array_property)
+    hw_abort (me, "property \"%s\" of wrong type (array)", property);
+  return node;
+}
+
+
+
+void
+hw_add_boolean_property (struct hw *me,
+			 const char *property,
+			 int boolean)
+{
+  signed32 new_boolean = (boolean ? -1 : 0);
+  hw_add_property (me, property, boolean_property,
+		   &new_boolean, sizeof(new_boolean),
+		   &new_boolean, sizeof(new_boolean),
+		   NULL, permenant_object);
+}
+
+int
+hw_find_boolean_property (struct hw *me,
+			  const char *property)
+{
+  const struct hw_property *node;
+  unsigned_cell boolean;
+  node = hw_find_property (me, property);
+  if (node == NULL)
+    hw_abort (me, "property \"%s\" not found", property);
+  if (node->type != boolean_property)
+    hw_abort (me, "property \"%s\" of wrong type (boolean)", property);
+  ASSERT (sizeof (boolean) == node->sizeof_array);
+  memcpy (&boolean, node->array, sizeof (boolean));
+  return boolean;
+}
+
+
+
+#if 0
+void
+hw_add_ihandle_runtime_property (struct hw *me,
+				 const char *property,
+				 const ihandle_runtime_property_spec *ihandle)
+{
+  /* enter the full path as the init array */
+  hw_add_property (me, property, ihandle_property,
+		   ihandle->full_path, strlen(ihandle->full_path) + 1,
+		   NULL, 0,
+		   NULL, permenant_object);
+}
+#endif
+
+#if 0
+void
+hw_find_ihandle_runtime_property (struct hw *me,
+				  const char *property,
+				  ihandle_runtime_property_spec *ihandle)
+{
+  struct hw_property_data *entry = find_property_data (me, property);
+  TRACE (trace_devices,
+	 ("hw_find_ihandle_runtime_property(me=0x%lx, property=%s)\n",
+	  (long)me, property));
+  if (entry == NULL)
+    hw_abort (me, "property \"%s\" not found", property);
+  if (entry->property->type != ihandle_property
+      || entry->property->disposition != permenant_object)
+    hw_abort (me, "property \"%s\" of wrong type", property);
+  ASSERT (entry->init_array != NULL);
+  /* the full path */
+  ihandle->full_path = entry->init_array;
+}
+#endif
+
+
+
+#if 0
+void
+hw_set_ihandle_property (struct hw *me,
+			 const char *property,
+			 hw_instance *ihandle)
+{
+  unsigned_cell cells;
+  cells = H2BE_cell (hw_instance_to_external (ihandle));
+  hw_set_property (me, property, ihandle_property,
+		   &cells, sizeof (cells));
+		      
+}
+#endif
+
+#if 0
+hw_instance *
+hw_find_ihandle_property (struct hw *me,
+			  const char *property)
+{
+  const hw_property_data *node;
+  unsigned_cell ihandle;
+  hw_instance *instance;
+
+  node = hw_find_property (me, property);
+  if (node == NULL)
+    hw_abort (me, "property \"%s\" not found", property);
+  if (node->type != ihandle_property)
+    hw_abort(me, "property \"%s\" of wrong type (ihandle)", property);
+  if (node->array == NULL)
+    hw_abort(me, "runtime property \"%s\" not yet initialized", property);
+
+  ASSERT (sizeof(ihandle) == node->sizeof_array);
+  memcpy (&ihandle, node->array, sizeof(ihandle));
+  instance = external_to_hw_instance (me, BE2H_cell(ihandle));
+  ASSERT (instance != NULL);
+  return instance;
+}
+#endif
+
+
+void
+hw_add_integer_property (struct hw *me,
+			 const char *property,
+			 signed_cell integer)
+{
+  H2BE (integer);
+  hw_add_property (me, property, integer_property,
+		   &integer, sizeof(integer),
+		   &integer, sizeof(integer),
+		   NULL, permenant_object);
+}
+
+signed_cell
+hw_find_integer_property (struct hw *me,
+			  const char *property)
+{
+  const struct hw_property *node;
+  signed_cell integer;
+  TRACE (trace_devices,
+	 ("hw_find_integer(me=0x%lx, property=%s)\n",
+	  (long)me, property));
+  node = hw_find_property (me, property);
+  if (node == NULL)
+    hw_abort (me, "property \"%s\" not found", property);
+  if (node->type != integer_property)
+    hw_abort (me, "property \"%s\" of wrong type (integer)", property);
+  ASSERT (sizeof(integer) == node->sizeof_array);
+  memcpy (&integer, node->array, sizeof (integer));
+  return BE2H_cell (integer);
+}
+
+int
+hw_find_integer_array_property (struct hw *me,
+				const char *property,
+				unsigned index,
+				signed_cell *integer)
+{
+  const struct hw_property *node;
+  int sizeof_integer = sizeof (*integer);
+  signed_cell *cell;
+  TRACE (trace_devices,
+	 ("hw_find_integer(me=0x%lx, property=%s)\n",
+	  (long)me, property));
+  
+  /* check things sane */
+  node = hw_find_property (me, property);
+  if (node == NULL)
+    hw_abort (me, "property \"%s\" not found", property);
+  if (node->type != integer_property
+      && node->type != array_property)
+    hw_abort (me, "property \"%s\" of wrong type (integer or array)", property);
+  if ((node->sizeof_array % sizeof_integer) != 0)
+    hw_abort (me, "property \"%s\" contains an incomplete number of cells", property);
+  if (node->sizeof_array <= sizeof_integer * index)
+    return 0;
+  
+  /* Find and convert the value */
+  cell = ((signed_cell*)node->array) + index;
+  *integer = BE2H_cell (*cell);
+  
+  return node->sizeof_array / sizeof_integer;
+}
+
+
+static unsigned_cell *
+unit_address_to_cells (const hw_unit *unit,
+		       unsigned_cell *cell,
+		       int nr_cells)
+{
+  int i;
+  ASSERT(nr_cells == unit->nr_cells);
+  for (i = 0; i < unit->nr_cells; i++)
+    {
+      *cell = H2BE_cell (unit->cells[i]);
+      cell += 1;
+    }
+  return cell;
+}
+
+
+static const unsigned_cell *
+cells_to_unit_address (const unsigned_cell *cell,
+		       hw_unit *unit,
+		       int nr_cells)
+{
+  int i;
+  memset(unit, 0, sizeof(*unit));
+  unit->nr_cells = nr_cells;
+  for (i = 0; i < unit->nr_cells; i++)
+    {
+      unit->cells[i] = BE2H_cell (*cell);
+      cell += 1;
+    }
+  return cell;
+}
+
+
+static unsigned
+nr_range_property_cells (struct hw *me,
+			 int nr_ranges)
+{
+  return ((hw_unit_nr_address_cells (me)
+	   + hw_unit_nr_address_cells (hw_parent (me))
+	   + hw_unit_nr_size_cells (me))
+	  ) * nr_ranges;
+}
+
+void
+hw_add_range_array_property (struct hw *me,
+			     const char *property,
+			     const range_property_spec *ranges,
+			     unsigned nr_ranges)
+{
+  unsigned sizeof_cells = (nr_range_property_cells (me, nr_ranges)
+			   * sizeof (unsigned_cell));
+  unsigned_cell *cells = hw_zalloc (me, sizeof_cells);
+  unsigned_cell *cell;
+  int i;
+  
+  /* copy the property elements over */
+  cell = cells;
+  for (i = 0; i < nr_ranges; i++)
+    {
+      const range_property_spec *range = &ranges[i];
+      /* copy the child address */
+      cell = unit_address_to_cells (&range->child_address, cell,
+				    hw_unit_nr_address_cells (me));
+      /* copy the parent address */
+      cell = unit_address_to_cells (&range->parent_address, cell, 
+				    hw_unit_nr_address_cells (hw_parent (me)));
+      /* copy the size */
+      cell = unit_address_to_cells (&range->size, cell, 
+				    hw_unit_nr_size_cells (me));
+    }
+  ASSERT (cell == &cells[nr_range_property_cells (me, nr_ranges)]);
+  
+  /* add it */
+  hw_add_property (me, property, range_array_property,
+		   cells, sizeof_cells,
+		   cells, sizeof_cells,
+		   NULL, permenant_object);
+  
+  hw_free (me, cells);
+}
+
+int
+hw_find_range_array_property (struct hw *me,
+			      const char *property,
+			      unsigned index,
+			      range_property_spec *range)
+{
+  const struct hw_property *node;
+  unsigned sizeof_entry = (nr_range_property_cells (me, 1)
+			   * sizeof (unsigned_cell));
+  const unsigned_cell *cells;
+  
+  /* locate the property */
+  node = hw_find_property (me, property);
+  if (node == NULL)
+    hw_abort (me, "property \"%s\" not found", property);
+  if (node->type != range_array_property)
+    hw_abort (me, "property \"%s\" of wrong type (range array)", property);
+  
+  /* aligned ? */
+  if ((node->sizeof_array % sizeof_entry) != 0)
+    hw_abort (me, "property \"%s\" contains an incomplete number of entries",
+	      property);
+  
+  /* within bounds? */
+  if (node->sizeof_array < sizeof_entry * (index + 1))
+    return 0;
+  
+  /* find the range of interest */
+  cells = (unsigned_cell*)((char*)node->array + sizeof_entry * index);
+  
+  /* copy the child address out - converting as we go */
+  cells = cells_to_unit_address (cells, &range->child_address,
+				 hw_unit_nr_address_cells (me));
+  
+  /* copy the parent address out - converting as we go */
+  cells = cells_to_unit_address (cells, &range->parent_address,
+				 hw_unit_nr_address_cells (hw_parent (me)));
+  
+  /* copy the size - converting as we go */
+  cells = cells_to_unit_address (cells, &range->size,
+				 hw_unit_nr_size_cells (me));
+  
+  return node->sizeof_array / sizeof_entry;
+}
+
+
+static unsigned
+nr_reg_property_cells (struct hw *me,
+		       int nr_regs)
+{
+  return (hw_unit_nr_address_cells (hw_parent(me))
+	  + hw_unit_nr_size_cells (hw_parent(me))
+	  ) * nr_regs;
+}
+
+void
+hw_add_reg_array_property (struct hw *me,
+			   const char *property,
+			   const reg_property_spec *regs,
+			   unsigned nr_regs)
+{
+  unsigned sizeof_cells = (nr_reg_property_cells (me, nr_regs)
+			   * sizeof (unsigned_cell));
+  unsigned_cell *cells = hw_zalloc (me, sizeof_cells);
+  unsigned_cell *cell;
+  int i;
+  
+  /* copy the property elements over */
+  cell = cells;
+  for (i = 0; i < nr_regs; i++)
+    {
+      const reg_property_spec *reg = &regs[i];
+      /* copy the address */
+      cell = unit_address_to_cells (&reg->address, cell,
+				    hw_unit_nr_address_cells (hw_parent (me)));
+      /* copy the size */
+      cell = unit_address_to_cells (&reg->size, cell,
+				    hw_unit_nr_size_cells (hw_parent (me)));
+    }
+  ASSERT (cell == &cells[nr_reg_property_cells (me, nr_regs)]);
+  
+  /* add it */
+  hw_add_property (me, property, reg_array_property,
+		   cells, sizeof_cells,
+		   cells, sizeof_cells,
+		   NULL, permenant_object);
+  
+  hw_free (me, cells);
+}
+
+int
+hw_find_reg_array_property (struct hw *me,
+			    const char *property,
+			    unsigned index,
+			    reg_property_spec *reg)
+{
+  const struct hw_property *node;
+  unsigned sizeof_entry = (nr_reg_property_cells (me, 1)
+			   * sizeof (unsigned_cell));
+  const unsigned_cell *cells;
+  
+  /* locate the property */
+  node = hw_find_property (me, property);
+  if (node == NULL)
+    hw_abort (me, "property \"%s\" not found", property);
+  if (node->type != reg_array_property)
+    hw_abort (me, "property \"%s\" of wrong type (reg array)", property);
+  
+  /* aligned ? */
+  if ((node->sizeof_array % sizeof_entry) != 0)
+    hw_abort (me, "property \"%s\" contains an incomplete number of entries",
+	      property);
+  
+  /* within bounds? */
+  if (node->sizeof_array < sizeof_entry * (index + 1))
+    return 0;
+  
+  /* find the range of interest */
+  cells = (unsigned_cell*)((char*)node->array + sizeof_entry * index);
+  
+  /* copy the address out - converting as we go */
+  cells = cells_to_unit_address (cells, &reg->address,
+				 hw_unit_nr_address_cells (hw_parent (me)));
+  
+  /* copy the size out - converting as we go */
+  cells = cells_to_unit_address (cells, &reg->size,
+				 hw_unit_nr_size_cells (hw_parent (me)));
+  
+  return node->sizeof_array / sizeof_entry;
+}
+
+
+void
+hw_add_string_property (struct hw *me,
+			const char *property,
+			const char *string)
+{
+  hw_add_property (me, property, string_property,
+		   string, strlen(string) + 1,
+		   string, strlen(string) + 1,
+		   NULL, permenant_object);
+}
+
+const char *
+hw_find_string_property (struct hw *me,
+			 const char *property)
+{
+  const struct hw_property *node;
+  const char *string;
+  node = hw_find_property (me, property);
+  if (node == NULL)
+    hw_abort (me, "property \"%s\" not found", property);
+  if (node->type != string_property)
+    hw_abort (me, "property \"%s\" of wrong type (string)", property);
+  string = node->array;
+  ASSERT (strlen(string) + 1 == node->sizeof_array);
+  return string;
+}
+
+void
+hw_add_string_array_property (struct hw *me,
+			      const char *property,
+			      const string_property_spec *strings,
+			      unsigned nr_strings)
+{
+  int sizeof_array;
+  int string_nr;
+  char *array;
+  char *chp;
+  if (nr_strings == 0)
+    hw_abort (me, "property \"%s\" must be non-null", property);
+  /* total up the size of the needed array */
+  for (sizeof_array = 0, string_nr = 0;
+       string_nr < nr_strings;
+       string_nr ++)
+    {
+      sizeof_array += strlen (strings[string_nr]) + 1;
+    }
+  /* create the array */
+  array = (char*) hw_zalloc (me, sizeof_array);
+  chp = array;
+  for (string_nr = 0;
+       string_nr < nr_strings;
+       string_nr++)
+    {
+      strcpy (chp, strings[string_nr]);
+      chp += strlen (chp) + 1;
+    }
+  ASSERT (chp == array + sizeof_array);
+  /* now enter it */
+  hw_add_property (me, property, string_array_property,
+		   array, sizeof_array,
+		   array, sizeof_array,
+		   NULL, permenant_object);
+}
+
+int
+hw_find_string_array_property (struct hw *me,
+			       const char *property,
+			       unsigned index,
+			       string_property_spec *string)
+{
+  const struct hw_property *node;
+  node = hw_find_property (me, property);
+  if (node == NULL)
+    hw_abort (me, "property \"%s\" not found", property);
+  switch (node->type)
+    {
+    default:
+      hw_abort (me, "property \"%s\" of wrong type", property);
+      break;
+    case string_property:
+      if (index == 0)
+	{
+	  *string = node->array;
+	  ASSERT (strlen(*string) + 1 == node->sizeof_array);
+	  return 1;
+	}
+      break;
+    case array_property:
+      if (node->sizeof_array == 0
+	  || ((char*)node->array)[node->sizeof_array - 1] != '\0')
+	hw_abort (me, "property \"%s\" invalid for string array", property);
+      /* FALL THROUGH */
+    case string_array_property:
+      ASSERT (node->sizeof_array > 0);
+      ASSERT (((char*)node->array)[node->sizeof_array - 1] == '\0');
+      {
+	const char *chp = node->array;
+	int nr_entries = 0;
+	/* count the number of strings, keeping an eye out for the one
+	   we're looking for */
+	*string = chp;
+	do
+	  {
+	    if (*chp == '\0')
+	      {
+		/* next string */
+		nr_entries++;
+		chp++;
+		if (nr_entries == index)
+		  *string = chp;
+	      }
+	    else
+	      {
+		chp++;
+	      }
+	  } while (chp < (char*)node->array + node->sizeof_array);
+	if (index < nr_entries)
+	  return nr_entries;
+	else
+	  {
+	    *string = NULL;
+	    return 0;
+	  }
+      }
+      break;
+    }
+  return 0;
+}
+
+void
+hw_add_duplicate_property (struct hw *me,
+			   const char *property,
+			   const struct hw_property *original)
+{
+  struct hw_property_data *master;
+  TRACE (trace_devices,
+	 ("hw_add_duplicate_property(me=0x%lx, property=%s, ...)\n",
+	  (long)me, property));
+  if (original->disposition != permenant_object)
+    hw_abort (me, "Can only duplicate permenant objects");
+  /* find the original's master */
+  master = original->owner->properties_of_hw;
+  while (master->property != original)
+    {
+      master = master->next;
+      ASSERT(master != NULL);
+    }
+  /* now duplicate it */
+  hw_add_property (me, property,
+		   original->type,
+		   master->init_array, master->sizeof_init_array,
+		   original->array, original->sizeof_array,
+		   original, permenant_object);
+}