xref: /src/external/gpl3/gdb.old/dist/sim/common/hw-tree.c

/* The common simulator framework for GDB, the GNU Debugger.

   Copyright 2002-2017 Free Software Foundation, Inc.

   Contributed by Andrew Cagney and Red Hat.

   This file is part of GDB.

   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 3 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, see <http://www.gnu.org/licenses/>.  */


#include "hw-main.h"
#include "hw-base.h"
#include "hw-tree.h"

#include "sim-io.h"
#include "sim-assert.h"

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

#ifdef HAVE_STRING_H
#include <string.h>
#else
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#endif

#include <ctype.h>

/* manipulate/lookup device names */

typedef struct _name_specifier
{

  /* components in the full length name */
  char *path;
  char *property;
  char *value;

  /* current device */
  char *family;
  char *name;
  char *unit;
  char *args;

  /* previous device */
  char *last_name;
  char *last_family;
  char *last_unit;
  char *last_args;

  /* work area */
  char buf[1024];

} name_specifier;



/* Given a device specifier, break it up into its main components:
   path (and if present) property name and property value. */

static int
split_device_specifier (struct hw *current,
			const char *device_specifier,
			name_specifier *spec)
{
  char *chp = NULL;

  /* expand any leading alias if present */
  if (current != NULL
      && *device_specifier != '\0'
      && *device_specifier != '.'
      && *device_specifier != '/')
    {
      struct hw *aliases = hw_tree_find_device (current, "/aliases");
      char alias[32];
      int len = 0;
      while (device_specifier[len] != '\0'
	     && device_specifier[len] != '/'
	     && device_specifier[len] != ':'
	     && !isspace (device_specifier[len]))
	{
	  alias[len] = device_specifier[len];
	  len++;
	  if (len >= sizeof (alias))
	    hw_abort (NULL, "split_device_specifier: buffer overflow");
	}
      alias[len] = '\0';
      if (aliases != NULL
	  && hw_find_property (aliases, alias))
	{
	  strcpy (spec->buf, hw_find_string_property (aliases, alias));
	  strcat (spec->buf, device_specifier + len);
	}
      else
	{
	  strcpy (spec->buf, device_specifier);
	}
    }
  else
    {
      strcpy (spec->buf, device_specifier);
    }

  /* check no overflow */
  if (strlen (spec->buf) >= sizeof (spec->buf))
    hw_abort (NULL, "split_device_specifier: buffer overflow\n");

  /* strip leading spaces */
  chp = spec->buf;
  while (*chp != '\0' && isspace (*chp))
    chp++;
  if (*chp == '\0')
    return 0;

  /* find the path and terminate it with null */
  spec->path = chp;
  while (*chp != '\0' && !isspace (*chp))
    chp++;
  if (*chp != '\0')
    {
      *chp = '\0';
      chp++;
    }

  /* and any value */
  while (*chp != '\0' && isspace (*chp))
    chp++;
  spec->value = chp;

  /* now go back and chop the property off of the path */
  if (spec->value[0] == '\0')
    {
      spec->property = NULL; /*not a property*/
      spec->value = NULL;
    }
  else if (spec->value[0] == '>'
	   || spec->value[0] == '<')
    {
      /* an interrupt spec */
      spec->property = NULL;
    }
  else
    {
      chp = strrchr (spec->path, '/');
      if (chp == NULL)
	{
	  spec->property = spec->path;
	  spec->path = strchr (spec->property, '\0');
	}
      else
	{
	  *chp = '\0';
	  spec->property = chp+1;
	}
    }

  /* and mark the rest as invalid */
  spec->name = NULL;
  spec->family = NULL;
  spec->unit = NULL;
  spec->args = NULL;
  spec->last_name = NULL;
  spec->last_family = NULL;
  spec->last_unit = NULL;
  spec->last_args = NULL;

  return 1;
}


/* given a device specifier break it up into its main components -
   path and property name - assuming that the last `device' is a
   property name. */

static int
split_property_specifier (struct hw *current,
			  const char *property_specifier,
			  name_specifier *spec)
{
  if (split_device_specifier (current, property_specifier, spec))
    {
      if (spec->property == NULL)
	{
	  /* force the last name to be a property name */
	  char *chp = strrchr (spec->path, '/');
	  if (chp == NULL)
	    {
	      spec->property = spec->path;
	      spec->path = strrchr (spec->property, '\0');;
	    }
	  else
	    {
	      *chp = '\0';
	      spec->property = chp + 1;
	    }
	}
      return 1;
    }
  else
    return 0;
}


/* device the next device name and split it up, return 0 when no more
   names to struct hw */

static int
split_device_name (name_specifier *spec)
{
  char *chp;
  /* remember what came before */
  spec->last_name = spec->name;
  spec->last_family = spec->family;
  spec->last_unit = spec->unit;
  spec->last_args = spec->args;
  /* finished? */
  if (spec->path[0] == '\0')
    {
      spec->name = NULL;
      spec->family = NULL;
      spec->unit = NULL;
      spec->args = NULL;
      return 0;
    }
  /* break the current device spec from the path */
  spec->name = spec->path;
  chp = strchr (spec->name, '/');
  if (chp == NULL)
    spec->path = strchr (spec->name, '\0');
  else
    {
      spec->path = chp+1;
      *chp = '\0';
    }
  /* break out the base */
  if (spec->name[0] == '(')
    {
      chp = strchr (spec->name, ')');
      if (chp == NULL)
	{
	  spec->family = spec->name;
	}
      else
	{
	  *chp = '\0';
	  spec->family = spec->name + 1;
	  spec->name = chp + 1;
	}
    }
  else
    {
      spec->family = spec->name;
    }
  /* now break out the unit */
  chp = strchr (spec->name, '@');
  if (chp == NULL)
    {
      spec->unit = NULL;
      chp = spec->name;
    }
  else
    {
      *chp = '\0';
      chp += 1;
      spec->unit = chp;
    }
  /* finally any args */
  chp = strchr (chp, ':');
  if (chp == NULL)
    spec->args = NULL;
  else
    {
      *chp = '\0';
      spec->args = chp+1;
    }
  return 1;
}


/* device the value, returning the next non-space token */

static char *
split_value (name_specifier *spec)
{
  char *token;
  if (spec->value == NULL)
    return NULL;
  /* skip leading white space */
  while (isspace (spec->value[0]))
    spec->value++;
  if (spec->value[0] == '\0')
    {
      spec->value = NULL;
      return NULL;
    }
  token = spec->value;
  /* find trailing space */
  while (spec->value[0] != '\0' && !isspace (spec->value[0]))
    spec->value++;
  /* chop this value out */
  if (spec->value[0] != '\0')
    {
      spec->value[0] = '\0';
      spec->value++;
    }
  return token;
}



/* traverse the path specified by spec starting at current */

static struct hw *
split_find_device (struct hw *current,
		   name_specifier *spec)
{
  /* strip off (and process) any leading ., .., ./ and / */
  while (1)
    {
      if (strncmp (spec->path, "/", strlen ("/")) == 0)
	{
	  /* cd /... */
	  while (current != NULL && hw_parent (current) != NULL)
	    current = hw_parent (current);
	  spec->path += strlen ("/");
	}
      else if (strncmp (spec->path, "./", strlen ("./")) == 0)
	{
	  /* cd ./... */
	  current = current;
	  spec->path += strlen ("./");
	}
      else if (strncmp (spec->path, "../", strlen ("../")) == 0)
	{
	  /* cd ../... */
	  if (current != NULL && hw_parent (current) != NULL)
	    current = hw_parent (current);
	  spec->path += strlen ("../");
	}
      else if (strcmp (spec->path, ".") == 0)
	{
	  /* cd . */
	  current = current;
	  spec->path += strlen (".");
	}
      else if (strcmp (spec->path, "..") == 0)
	{
	  /* cd .. */
	  if (current != NULL && hw_parent (current) != NULL)
	    current = hw_parent (current);
	  spec->path += strlen ("..");
	}
      else
	break;
    }

  /* now go through the path proper */

  if (current == NULL)
    {
      split_device_name (spec);
      return NULL;
    }

  while (split_device_name (spec))
    {
      struct hw *child;
      for (child = hw_child (current);
	   child != NULL; child = hw_sibling (child))
	{
	  if (strcmp (spec->name, hw_name (child)) == 0)
	    {
	      if (spec->unit == NULL)
		break;
	      else
		{
		  hw_unit phys;
		  hw_unit_decode (current, spec->unit, &phys);
		  if (memcmp (&phys, hw_unit_address (child),
			      sizeof (hw_unit)) == 0)
		    break;
		}
	    }
	}
      if (child == NULL)
	return current; /* search failed */
      current = child;
    }

  return current;
}


static struct hw *
split_fill_path (struct hw *current,
		 const char *device_specifier,
		 name_specifier *spec)
{
  /* break it up */
  if (!split_device_specifier (current, device_specifier, spec))
    hw_abort (current, "error parsing %s\n", device_specifier);

  /* fill our tree with its contents */
  current = split_find_device (current, spec);

  /* add any additional devices as needed */
  if (spec->name != NULL)
    {
      do
	{
	  if (current != NULL && !hw_finished_p (current))
	    hw_finish (current);
	  current = hw_create (NULL,
			       current,
			       spec->family,
			       spec->name,
			       spec->unit,
			       spec->args);
	}
      while (split_device_name (spec));
    }

  return current;
}


/* <non-white-space> */

static const char *
skip_token (const char *chp)
{
  while (!isspace (*chp) && *chp != '\0')
    chp++;
  while (isspace (*chp) && *chp != '\0')
    chp++;
  return chp;
}


/* count the number of entries */

static int
count_entries (struct hw *current,
	       const char *property_name,
	       const char *property_value,
	       int modulo)
{
  const char *chp = property_value;
  int nr_entries = 0;
  while (*chp != '\0')
    {
      nr_entries += 1;
      chp = skip_token (chp);
    }
  if ((nr_entries % modulo) != 0)
    {
      hw_abort (current, "incorrect number of entries for %s property %s, should be multiple of %d",
		property_name, property_value, modulo);
    }
  return nr_entries / modulo;
}



/* parse: <address> ::= <token> ; device dependant */

static const char *
parse_address (struct hw *current,
	       struct hw *bus,
	       const char *chp,
	       hw_unit *address)
{
  if (hw_unit_decode (bus, chp, address) < 0)
    hw_abort (current, "invalid unit address in %s", chp);
  return skip_token (chp);
}


/* parse: <size> ::= <number> { "," <number> } ; */

static const char *
parse_size (struct hw *current,
	    struct hw *bus,
	    const char *chp,
	    hw_unit *size)
{
  int i;
  int nr;
  const char *curr = chp;
  memset (size, 0, sizeof (*size));
  /* parse the numeric list */
  size->nr_cells = hw_unit_nr_size_cells (bus);
  nr = 0;
  while (1)
    {
      char *next;
      size->cells[nr] = strtoul (curr, &next, 0);
      if (curr == next)
	hw_abort (current, "Problem parsing <size> %s", chp);
      nr += 1;
      if (next[0] != ',')
	break;
      if (nr == size->nr_cells)
	hw_abort (current, "Too many values in <size> %s", chp);
      curr = next + 1;
    }
  ASSERT (nr > 0 && nr <= size->nr_cells);
  /* right align the numbers */
  for (i = 1; i <= size->nr_cells; i++)
    {
      if (i <= nr)
	size->cells[size->nr_cells - i] = size->cells[nr - i];
      else
	size->cells[size->nr_cells - i] = 0;
    }
  return skip_token (chp);
}


/* parse: <reg> ::= { <address> <size> } ; */

static void
parse_reg_property (struct hw *current,
		    const char *property_name,
		    const char *property_value)
{
  int nr_regs;
  int reg_nr;
  reg_property_spec *regs;
  const char *chp;

  /* determine the number of reg entries by counting tokens */
  nr_regs = count_entries (current, property_name, property_value, 2);

  /* create working space */
  regs = zalloc (nr_regs * sizeof (*regs));

  /* fill it in */
  chp = property_value;
  for (reg_nr = 0; reg_nr < nr_regs; reg_nr++)
    {
      chp = parse_address (current, hw_parent (current),
			   chp, &regs[reg_nr].address);
      chp = parse_size (current, hw_parent (current),
			chp, &regs[reg_nr].size);
    }

  /* create it */
  hw_add_reg_array_property (current, property_name,
			     regs, nr_regs);

  free (regs);
}


/* { <child-address> <parent-address> <child-size> }* */

static void
parse_ranges_property (struct hw *current,
		       const char *property_name,
		       const char *property_value)
{
  int nr_ranges;
  int range_nr;
  range_property_spec *ranges;
  const char *chp;

  /* determine the number of ranges specified */
  nr_ranges = count_entries (current, property_name, property_value, 3);

  /* create a property of that size */
  ranges = zalloc (nr_ranges * sizeof (*ranges));

  /* fill it in */
  chp = property_value;
  for (range_nr = 0; range_nr < nr_ranges; range_nr++)
    {
      chp = parse_address (current, current,
			   chp, &ranges[range_nr].child_address);
      chp = parse_address (current, hw_parent (current),
			   chp, &ranges[range_nr].parent_address);
      chp = parse_size (current, current,
			chp, &ranges[range_nr].size);
    }

  /* create it */
  hw_add_range_array_property (current, property_name, ranges, nr_ranges);

  free (ranges);
}


/* <integer> ... */

static void
parse_integer_property (struct hw *current,
			const char *property_name,
			const char *property_value)
{
  int nr_entries;
  unsigned_cell words[1024];
  /* integer or integer array? */
  nr_entries = 0;
  while (1)
    {
      char *end;
      words[nr_entries] = strtoul (property_value, &end, 0);
      if (property_value == end)
	break;
      nr_entries += 1;
      if (nr_entries * sizeof (words[0]) >= sizeof (words))
	hw_abort (current, "buffer overflow");
      property_value = end;
    }
  if (nr_entries == 0)
    hw_abort (current, "error parsing integer property %s (%s)",
	      property_name, property_value);
  else if (nr_entries == 1)
    hw_add_integer_property (current, property_name, words[0]);
  else
    {
      int i;
      for (i = 0; i < nr_entries; i++)
	{
	  H2BE (words[i]);
	}
      /* perhaps integer array property is better */
      hw_add_array_property (current, property_name, words,
			     sizeof (words[0]) * nr_entries);
    }
}


/* <string> ... */

static void
parse_string_property (struct hw *current,
		       const char *property_name,
		       const char *property_value)
{
  char **strings;
  const char *chp;
  int nr_strings;
  int approx_nr_strings;

  /* get an estimate as to the number of strings by counting double
     quotes */
  approx_nr_strings = 2;
  for (chp = property_value; *chp; chp++)
    {
      if (*chp == '"')
	approx_nr_strings++;
    }
  approx_nr_strings = (approx_nr_strings) / 2;

  /* create a string buffer for that many (plus a null) */
  strings = (char**) zalloc ((approx_nr_strings + 1) * sizeof (char*));

  /* now find all the strings */
  chp = property_value;
  nr_strings = 0;
  while (1)
    {

      /* skip leading space */
      while (*chp != '\0' && isspace (*chp))
	chp += 1;
      if (*chp == '\0')
	break;

      /* copy it in */
      if (*chp == '"')
	{
	  /* a quoted string - watch for '\' et al. */
	  /* estimate the size and allocate space for it */
	  int pos;
	  chp++;
	  pos = 0;
	  while (chp[pos] != '\0' && chp[pos] != '"')
	    {
	      if (chp[pos] == '\\' && chp[pos+1] != '\0')
		pos += 2;
	      else
		pos += 1;
	    }
	  strings[nr_strings] = zalloc (pos + 1);
	  /* copy the string over */
	  pos = 0;
	  while (*chp != '\0' && *chp != '"')
	    {
	      if (*chp == '\\' && *(chp+1) != '\0')
		{
		  strings[nr_strings][pos] = *(chp+1);
		  chp += 2;
		  pos++;
		}
	      else
		{
		  strings[nr_strings][pos] = *chp;
		  chp += 1;
		  pos++;
		}
	    }
	  if (*chp != '\0')
	    chp++;
	  strings[nr_strings][pos] = '\0';
	}
      else
	{
	  /* copy over a single unquoted token */
	  int len = 0;
	  while (chp[len] != '\0' && !isspace (chp[len]))
	    len++;
	  strings[nr_strings] = zalloc (len + 1);
	  strncpy (strings[nr_strings], chp, len);
	  strings[nr_strings][len] = '\0';
	  chp += len;
	}
      nr_strings++;
      if (nr_strings > approx_nr_strings)
	hw_abort (current, "String property %s badly formatted",
		  property_name);
    }
  ASSERT (strings[nr_strings] == NULL); /* from zalloc */

  /* install it */
  if (nr_strings == 0)
    hw_add_string_property (current, property_name, "");
  else if (nr_strings == 1)
    hw_add_string_property (current, property_name, strings[0]);
  else
    {
      const char **specs = (const char**) strings; /* stop a bogus error */
      hw_add_string_array_property (current, property_name,
				    specs, nr_strings);
    }

  /* flush the created string */
  while (nr_strings > 0)
    {
      nr_strings--;
      free (strings[nr_strings]);
    }
  free (strings);
}


/* <path-to-ihandle-device> */

#if NOT_YET
static void
parse_ihandle_property (struct hw *current,
			const char *property,
			const char *value)
{
  ihandle_runtime_property_spec ihandle;

  /* pass the full path */
  ihandle.full_path = value;

  /* save this ready for the ihandle create */
  hw_add_ihandle_runtime_property (current, property,
				   &ihandle);
}
#endif


struct hw *
hw_tree_create (SIM_DESC sd,
		const char *family)
{
  return hw_create (sd, NULL, family, family, NULL, NULL);
}

void
hw_tree_delete (struct hw *me)
{
  /* Need to allow devices to disapear under our feet */
  while (hw_child (me) != NULL)
    {
      hw_tree_delete (hw_child (me));
    }
  hw_delete (me);
}


struct hw *
hw_tree_parse (struct hw *current,
	       const char *fmt,
	       ...)
{
    va_list ap;
    va_start (ap, fmt);
    current = hw_tree_vparse (current, fmt, ap);
    va_end (ap);
    return current;
}

struct hw *
hw_tree_vparse (struct hw *current,
		const char *fmt,
		va_list ap)
{
  char device_specifier[1024];
  name_specifier spec;

  /* format the path */
  vsprintf (device_specifier, fmt, ap);
  if (strlen (device_specifier) >= sizeof (device_specifier))
    hw_abort (NULL, "device_tree_add_deviced: buffer overflow\n");

  /* construct the tree down to the final struct hw */
  current = split_fill_path (current, device_specifier, &spec);

  /* is there an interrupt spec */
  if (spec.property == NULL
      && spec.value != NULL)
    {
      char *op = split_value (&spec);
      switch (op[0])
	{
	case '>':
	  {
	    char *my_port_name = split_value (&spec);
	    int my_port;
	    char *dest_port_name = split_value (&spec);
	    int dest_port;
	    name_specifier dest_spec;
	    char *dest_hw_name = split_value (&spec);
	    struct hw *dest;
	    /* find my name */
	    if (!hw_finished_p (current))
	      hw_finish (current);
	    my_port = hw_port_decode (current, my_port_name, output_port);
	    /* find the dest device and port */
	    dest = split_fill_path (current, dest_hw_name, &dest_spec);
	    if (!hw_finished_p (dest))
	      hw_finish (dest);
	    dest_port = hw_port_decode (dest, dest_port_name,
					input_port);
	    /* connect the two */
	    hw_port_attach (current,
			    my_port,
			    dest,
			    dest_port,
			    permenant_object);
	    break;
	  }
	default:
	  hw_abort (current, "unreconised interrupt spec %s\n", spec.value);
	  break;
	}
    }

  /* is there a property */
  if (spec.property != NULL)
    {
      if (strcmp (spec.value, "true") == 0)
	hw_add_boolean_property (current, spec.property, 1);
      else if (strcmp (spec.value, "false") == 0)
	hw_add_boolean_property (current, spec.property, 0);
      else
	{
	  const struct hw_property *property;
	  switch (spec.value[0])
	    {
#if NOT_YET
	    case '*':
	      {
		parse_ihandle_property (current, spec.property, spec.value + 1);
		break;
	      }
#endif
	    case '[':
	      {
		unsigned8 words[1024];
		char *curr = spec.value + 1;
		int nr_words = 0;
		while (1)
		  {
		    char *next;
		    words[nr_words] = H2BE_1 (strtoul (curr, &next, 0));
		    if (curr == next)
		      break;
		    curr = next;
		    nr_words += 1;
		  }
		hw_add_array_property (current, spec.property,
				       words, sizeof (words[0]) * nr_words);
		break;
	      }
	    case '"':
	      {
		parse_string_property (current, spec.property, spec.value);
		break;
	      }
	    case '!':
	      {
		spec.value++;
		property = hw_tree_find_property (current, spec.value);
		if (property == NULL)
		  hw_abort (current, "property %s not found\n", spec.value);
		hw_add_duplicate_property (current,
					   spec.property,
					   property);
		break;
	      }
	    default:
	      {
		if (strcmp (spec.property, "reg") == 0
		    || strcmp (spec.property, "assigned-addresses") == 0
		    || strcmp (spec.property, "alternate-reg") == 0)
		  {
		    parse_reg_property (current, spec.property, spec.value);
		  }
		else if (strcmp (spec.property, "ranges") == 0)
		  {
		    parse_ranges_property (current, spec.property, spec.value);
		  }
		else if (isdigit (spec.value[0])
			 || (spec.value[0] == '-' && isdigit (spec.value[1]))
			 || (spec.value[0] == '+' && isdigit (spec.value[1])))
		  {
		    parse_integer_property (current, spec.property, spec.value);
		  }
		else
		  parse_string_property (current, spec.property, spec.value);
		break;
	      }
	    }
	}
    }
  return current;
}


static void
finish_hw_tree (struct hw *me,
		void *data)
{
  if (!hw_finished_p (me))
    hw_finish (me);
}

void
hw_tree_finish (struct hw *root)
{
  hw_tree_traverse (root, finish_hw_tree, NULL, NULL);
}



void
hw_tree_traverse (struct hw *root,
		  hw_tree_traverse_function *prefix,
		  hw_tree_traverse_function *postfix,
		  void *data)
{
  struct hw *child;
  if (prefix != NULL)
    prefix (root, data);
  for (child = hw_child (root);
       child != NULL;
       child = hw_sibling (child))
    {
      hw_tree_traverse (child, prefix, postfix, data);
    }
  if (postfix != NULL)
    postfix (root, data);
}



struct printer
{
  hw_tree_print_callback *print;
  void *file;
};

static void
print_address (struct hw *bus,
	       const hw_unit *phys,
	       struct printer *p)
{
  char unit[32];
  hw_unit_encode (bus, phys, unit, sizeof (unit));
  p->print (p->file, " %s", unit);
}

static void
print_size (struct hw *bus,
	    const hw_unit *size,
	    struct printer *p)
{
  int i;
  for (i = 0; i < size->nr_cells; i++)
    if (size->cells[i] != 0)
      break;
  if (i < size->nr_cells)
    {
      p->print (p->file, " 0x%lx", (unsigned long) size->cells[i]);
      i++;
      for (; i < size->nr_cells; i++)
	p->print (p->file, ",0x%lx", (unsigned long) size->cells[i]);
    }
  else
    p->print (p->file, " 0");
}

static void
print_reg_property (struct hw *me,
		    const struct hw_property *property,
		    struct printer *p)
{
  int reg_nr;
  reg_property_spec reg;
  for (reg_nr = 0;
       hw_find_reg_array_property (me, property->name, reg_nr, &reg);
       reg_nr++)
    {
      print_address (hw_parent (me), &reg.address, p);
      print_size (me, &reg.size, p);
    }
}

static void
print_ranges_property (struct hw *me,
		       const struct hw_property *property,
		       struct printer *p)
{
  int range_nr;
  range_property_spec range;
  for (range_nr = 0;
       hw_find_range_array_property (me, property->name, range_nr, &range);
       range_nr++)
    {
      print_address (me, &range.child_address, p);
      print_address (hw_parent (me), &range.parent_address, p);
      print_size (me, &range.size, p);
    }
}

static void
print_string (struct hw *me,
	      const char *string,
	      struct printer *p)
{
  p->print (p->file, " \"");
  while (*string != '\0')
    {
      switch (*string)
	{
	case '"':
	  p->print (p->file, "\\\"");
	  break;
	case '\\':
	  p->print (p->file, "\\\\");
	  break;
	default:
	  p->print (p->file, "%c", *string);
	  break;
	}
      string++;
    }
  p->print (p->file, "\"");
}

static void
print_string_array_property (struct hw *me,
			     const struct hw_property *property,
			     struct printer *p)
{
  int nr;
  string_property_spec string;
  for (nr = 0;
       hw_find_string_array_property (me, property->name, nr, &string);
       nr++)
    {
      print_string (me, string, p);
    }
}

static void
print_properties (struct hw *me,
		  struct printer *p)
{
  const struct hw_property *property;
  for (property = hw_find_property (me, NULL);
       property != NULL;
       property = hw_next_property (property))
    {
      if (hw_parent (me) == NULL)
	p->print (p->file, "/%s", property->name);
      else
	p->print (p->file, "%s/%s", hw_path (me), property->name);
      if (property->original != NULL)
	{
	  p->print (p->file, " !");
	  p->print (p->file, "%s/%s",
		     hw_path (property->original->owner),
		     property->original->name);
	}
      else
	{
	  switch (property->type)
	    {
	    case array_property:
	      {
		if ((property->sizeof_array % sizeof (signed_cell)) == 0)
		  {
		    unsigned_cell *w = (unsigned_cell*) property->array;
		    int cell_nr;
		    for (cell_nr = 0;
			 cell_nr < (property->sizeof_array / sizeof (unsigned_cell));
			 cell_nr++)
		      {
			p->print (p->file, " 0x%lx", (unsigned long) BE2H_cell (w[cell_nr]));
		      }
		  }
		else
		  {
		    unsigned8 *w = (unsigned8*)property->array;
		    p->print (p->file, " [");
		    while ((char*)w - (char*)property->array < property->sizeof_array)
		      {
			p->print (p->file, " 0x%2x", BE2H_1 (*w));
			w++;
		      }
		  }
		break;
	      }
	    case boolean_property:
	      {
		int b = hw_find_boolean_property (me, property->name);
		p->print (p->file, " %s", b ? "true"  : "false");
		break;
	      }
#if NOT_YET
	    case ihandle_property:
	      {
		if (property->array != NULL)
		  {
		    device_instance *instance = hw_find_ihandle_property (me, property->name);
		    p->print (p->file, " *%s", device_instance_path (instance));
		  }
		else
		  {
		    /* not yet initialized, ask the device for the path */
		    ihandle_runtime_property_spec spec;
		    hw_find_ihandle_runtime_property (me, property->name, &spec);
		    p->print (p->file, " *%s", spec.full_path);
		  }
		break;
	      }
#endif
	    case integer_property:
	      {
		unsigned_word w = hw_find_integer_property (me, property->name);
		p->print (p->file, " 0x%lx", (unsigned long)w);
		break;
	      }
	    case range_array_property:
	      {
		print_ranges_property (me, property, p);
		break;
	      }
	    case reg_array_property:
	      {
		print_reg_property (me, property, p);
		break;
	      }
	    case string_property:
	      {
		const char *s = hw_find_string_property (me, property->name);
		print_string (me, s, p);
		break;
	      }
	    case string_array_property:
	      {
		print_string_array_property (me, property, p);
		break;
	      }
	    }
	}
      p->print (p->file, "\n");
    }
}

static void
print_interrupts (struct hw *me,
                  int my_port,
		  struct hw *dest,
		  int dest_port,
		  void *data)
{
  struct printer *p = data;
  char src[32];
  char dst[32];
  hw_port_encode (me, my_port, src, sizeof (src), output_port);
  hw_port_encode (dest, dest_port, dst, sizeof (dst), input_port);
  p->print (p->file,
	    "%s > %s %s %s\n",
	    hw_path (me),
	    src, dst,
	    hw_path (dest));
}

static void
print_device (struct hw *me,
	      void *data)
{
  struct printer *p = data;
  p->print (p->file, "%s\n", hw_path (me));
  print_properties (me, p);
  hw_port_traverse (me, print_interrupts, data);
}

void
hw_tree_print (struct hw *root,
	       hw_tree_print_callback *print,
	       void *file)
{
  struct printer p;
  p.print = print;
  p.file = file;
  hw_tree_traverse (root,
		    print_device, NULL,
		    &p);
}



#if NOT_YET
device_instance *
tree_instance (struct hw *root,
	       const char *device_specifier)
{
  /* find the device node */
  struct hw *me;
  name_specifier spec;
  if (!split_device_specifier (root, device_specifier, &spec))
    return NULL;
  me = split_find_device (root, &spec);
  if (spec.name != NULL)
    return NULL;
  /* create the instance */
  return device_create_instance (me, device_specifier, spec.last_args);
}
#endif

struct hw *
hw_tree_find_device (struct hw *root,
		     const char *path_to_device)
{
  struct hw *node;
  name_specifier spec;

  /* parse the path */
  split_device_specifier (root, path_to_device, &spec);
  if (spec.value != NULL)
    return NULL; /* something wierd */

  /* now find it */
  node = split_find_device (root, &spec);
  if (spec.name != NULL)
    return NULL; /* not a leaf */

  return node;
}


const struct hw_property *
hw_tree_find_property (struct hw *root,
		       const char *path_to_property)
{
  name_specifier spec;
  if (!split_property_specifier (root, path_to_property, &spec))
    hw_abort (root, "Invalid property path %s", path_to_property);
  root = split_find_device (root, &spec);
  if (spec.name != NULL)
    return NULL; /* not a leaf */
  return hw_find_property (root, spec.property);
}

int
hw_tree_find_boolean_property (struct hw *root,
			       const char *path_to_property)
{
  name_specifier spec;
  if (!split_property_specifier (root, path_to_property, &spec))
    hw_abort (root, "Invalid property path %s", path_to_property);
  root = split_find_device (root, &spec);
  if (spec.name != NULL)
    hw_abort (root, "device \"%s\" not found (property \"%s\")",
	      spec.name, path_to_property);
  return hw_find_boolean_property (root, spec.property);
}

signed_cell
hw_tree_find_integer_property (struct hw *root,
			       const char *path_to_property)
{
  name_specifier spec;
  if (!split_property_specifier (root, path_to_property, &spec))
    hw_abort (root, "Invalid property path %s", path_to_property);
  root = split_find_device (root, &spec);
  if (spec.name != NULL)
    hw_abort (root, "device \"%s\" not found (property \"%s\")",
	      spec.name, path_to_property);
  return hw_find_integer_property (root, spec.property);
}

#if NOT_YET
device_instance *
hw_tree_find_ihandle_property (struct hw *root,
			       const char *path_to_property)
{
  struct hw *root;
  name_specifier spec;
  if (!split_property_specifier (root, path_to_property, &spec))
    hw_abort (root, "Invalid property path %s", path_to_property);
  root = split_find_device (root, &spec);
  if (spec.name != NULL)
    hw_abort (root, "device \"%s\" not found (property \"%s\")",
	      spec.name, path_to_property);
  return hw_find_ihandle_property (root, spec.property);
}
#endif

const char *
hw_tree_find_string_property (struct hw *root,
			      const char *path_to_property)
{
  name_specifier spec;
  if (!split_property_specifier (root, path_to_property, &spec))
    hw_abort (root, "Invalid property path %s", path_to_property);
  root = split_find_device (root, &spec);
  if (spec.name != NULL)
    hw_abort (root, "device \"%s\" not found (property \"%s\")",
	      spec.name, path_to_property);
  return hw_find_string_property (root, spec.property);
}