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diff --git a/sim/ppc/hw_trace.c b/sim/ppc/hw_trace.c
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+/*  This file is part of the program psim.
+    
+    Copyright (C) 1994-1996, 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.
+    
+    */
+
+
+#ifndef _HW_TRACE_C_
+#define _HW_TRACE_C_
+
+#include "device_table.h"
+#include <stdarg.h>
+
+/* DEVICE
+
+   trace - the properties of this dummy device specify trace options
+
+   DESCRIPTION
+
+   The properties of this device are used, during initialization, to
+   specify the value various simulation trace options.  The
+   initialization can occure implicitly (during device tree init) or
+   explicitly using this devices ioctl method.
+
+   The actual options and their default values (for a given target)
+   are defined in the file debug.
+
+   This device is normally a child of the /openprom node.
+
+   EXAMPLE
+
+   The trace option dump-device-tree can be enabled by specifying the
+   option:
+
+   |	-o '/openprom/trace/dump-device-tree 0x1'
+
+   Alternativly the shorthand version:
+
+   |	-t dump-device-tree
+
+   can be used. */
+
+
+/* Hook to allow the initialization of the trace options at any time */
+
+static int
+hw_trace_ioctl(device *me,
+	       cpu *processor,
+	       unsigned_word cia,
+	       device_ioctl_request request,
+	       va_list ap)
+{
+  switch (request) {
+  case device_ioctl_set_trace:
+    {
+      const device_property *prop = device_find_property(me, NULL);
+      while (prop != NULL) {
+	const char *name = prop->name;
+	unsigned32 value = device_find_integer_property(me, name);
+	trace_option(name, value);
+	prop = device_next_property(prop);
+      }
+    }
+    break;
+  default:
+    device_error(me, "insupported ioctl request");
+    break;
+  }
+  return 0;
+}
+
+
+static device_callbacks const hw_trace_callbacks = {
+  { NULL, }, /* init */
+  { NULL, }, /* address */
+  { NULL, }, /* IO */
+  { NULL, }, /* DMA */
+  { NULL, }, /* interrupt */
+  { NULL, }, /* unit */
+  NULL, /* instance-create */
+  hw_trace_ioctl,
+};
+
+const device_descriptor hw_trace_device_descriptor[] = {
+  { "trace", NULL, &hw_trace_callbacks },
+  { NULL },
+};
+
+#endif _HW_TRACE_C_