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diff --git a/sim/ppc/sim_callbacks.h b/sim/ppc/sim_callbacks.h
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+/*  This file is part of the program psim.
+
+    Copyright (C) 1994-1995,1998, 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.
+ 
+    */
+
+
+#ifndef _SIM_CALLBACKS_H_
+#define _SIM_CALLBACKS_H_
+
+/* Simulator output:
+
+   Functions to report diagnostic information to the user. */
+
+#define printf_filtered sim_io_printf_filtered
+void sim_io_printf_filtered
+(const char *msg, ...) __attribute__ ((format (printf, 1, 2)));
+
+void NORETURN error
+(const char *msg, ...);
+
+
+/* External environment:
+
+   Some HOST OS's require regular polling so that external events such
+   as GUI io can be handled. */
+
+void sim_io_poll_quit
+(void);
+
+
+
+/* Model I/O:
+
+   These functions provide the interface between the modeled targets
+   standard input and output streams and the hosts external
+   environment.
+
+   The underlying model is responsible for co-ordinating I/O
+   interactions such as:
+
+        main()
+        {
+          const char mess[] = "Hello World\r\n";
+          int out;
+          out = dup(1);
+          close(1);
+          write(out, mess, sizeof(mess))
+        }
+
+   That is to say, the underlying model would, in implementing dup()
+   recorded the fact that any output directed at fid-OUT should be
+   displayed using sim_io_write_stdout().  While for the code stub:
+
+        main()
+        {
+          const char mess[] = "Hello World\r\n";
+          int out;
+          close(1);
+          out = open("output", 0x0001|0x0200, 0); // write+create
+          out = dup(1);
+          write(out, mess, sizeof(mess))
+        }
+
+   would result in output to fid-1 being directed towards the file
+   "output". */
+
+
+int
+sim_io_write_stdout
+(const char *buf,
+ int sizeof_buf);
+
+int
+sim_io_write_stderr
+(const char *buf,
+ int sizeof_buf);
+
+/* read results */
+enum { sim_io_eof = -1, sim_io_not_ready = -2, }; /* See: IEEE 1275 */
+  
+int
+sim_io_read_stdin
+(char *buf,
+ int sizeof_buf);
+
+#define flush_stdoutput sim_io_flush_stdoutput
+void sim_io_flush_stdoutput
+(void);
+
+
+/* Memory management with an allocator that clears memory before use. */
+
+void *zalloc
+(long size);
+
+#define ZALLOC(TYPE) (TYPE*)zalloc(sizeof (TYPE))
+
+void zfree(void*);
+
+#endif