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diff --git a/sim/common/sim-base.h b/sim/common/sim-base.h
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+/* Simulator pseudo baseclass.
+   Copyright (C) 1997 Free Software Foundation, Inc.
+   Contributed by Cygnus Support.
+
+This file is part of GDB, the GNU debugger.
+
+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, 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.  */
+
+/* This file is meant to be included by sim-basics.h.  */
+
+#ifndef SIM_BASE_H
+#define SIM_BASE_H
+
+/* Global pointer to current state while sim_resume is running.
+   On a machine with lots of registers, it might be possible to reserve
+   one of them for current_state.  However on a machine with few registers
+   current_state can't permanently live in one and indirecting through it
+   will be slower [in which case one can have sim_resume set globals from
+   current_state for faster access].
+   If CURRENT_STATE_REG is defined, it means current_state is living in
+   a global register.  */
+
+#ifdef CURRENT_STATE_REG
+/* FIXME: wip */
+#else
+extern struct sim_state *current_state;
+#endif
+
+/* Simulator state pseudo base-class.
+   Each simulator is required to have a sim-main.h file that includes
+   sim-basics.h and defines struct sim_state to be:
+
+   struct sim_state {
+     struct sim_state_base base;
+     ... simulator specific members ...
+   };
+   */
+
+struct sim_state_base {
+  /* Marker for those wanting to do sanity checks.  */
+  int magic;
+#define SIM_MAGIC_NUMBER 0x4242
+#define STATE_MAGIC(sd) ((sd)->base.magic)
+
+  /* Simulator's argv[0].  */
+  const char *my_name;
+#define STATE_MY_NAME(sd) ((sd)->base.my_name)
+
+  /* Who opened the simulator.  */
+  SIM_OPEN_KIND open_kind;
+#define STATE_OPEN_KIND(sd) ((sd)->base.open_kind)
+
+  /* The host callbacks.  */
+  struct host_callback_struct *callback;
+#define STATE_CALLBACK(sd) ((sd)->base.callback)
+
+#if 0 /* FIXME: Not ready yet.  */
+  /* Stuff defined in sim-config.h.  */
+  struct sim_config config;
+#define STATE_CONFIG(sd) ((sd)->base.config)
+#endif
+};
+
+/* Functions for allocating/freeing a sim_state.  */
+SIM_DESC sim_state_alloc PARAMS ((void));
+void sim_state_free PARAMS ((SIM_DESC));
+
+#endif /* SIM_BASE_H */