diff --git a/sim/common/sim-cpu.h b/sim/common/sim-cpu.h
new file mode 100644
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--- /dev/null
+++ b/sim/common/sim-cpu.h
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+/* CPU support.
+   Copyright (C) 1998 Free Software Foundation, Inc.
+   Contributed by Cygnus Solutions.
+
+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 intended to be included by sim-base.h.
+
+   This file provides an interface between the simulator framework and
+   the selected cpu.  */
+
+#ifndef SIM_CPU_H
+#define SIM_CPU_H
+
+/* Type of function to return an insn name.  */
+typedef const char * (CPU_INSN_NAME_FN) (sim_cpu *, int);
+
+/* Types for register access functions.
+   These routines implement the sim_{fetch,store}_register interface.  */
+typedef int (CPUREG_FETCH_FN) (sim_cpu *, int, unsigned char *, int);
+typedef int (CPUREG_STORE_FN) (sim_cpu *, int, unsigned char *, int);
+
+/* Types for PC access functions.
+   Some simulators require a functional interface to access the program
+   counter [a macro is insufficient as the PC is kept in a cpu-specific part
+   of the sim_cpu struct].  */
+typedef sim_cia (PC_FETCH_FN) (sim_cpu *);
+typedef void (PC_STORE_FN) (sim_cpu *, sim_cia);
+
+/* Pseudo baseclass for each cpu.  */
+
+typedef struct {
+
+  /* Backlink to main state struct.  */
+  SIM_DESC state;
+#define CPU_STATE(cpu) ((cpu)->base.state)
+
+  /* Processor index within the SD_DESC */
+  int index;
+#define CPU_INDEX(cpu) ((cpu)->base.index)
+
+  /* The name of the cpu.  */
+  const char *name;
+#define CPU_NAME(cpu) ((cpu)->base.name)
+
+  /* Options specific to this cpu.  */
+  struct option_list *options;
+#define CPU_OPTIONS(cpu) ((cpu)->base.options)
+
+  /* Processor specific core data */
+  sim_cpu_core core;
+#define CPU_CORE(cpu) (& (cpu)->base.core)
+
+  /* Number of instructions (used to iterate over CPU_INSN_NAME).  */
+  unsigned int max_insns;
+#define CPU_MAX_INSNS(cpu) ((cpu)->base.max_insns)
+
+  /* Function to return the name of an insn.  */
+  CPU_INSN_NAME_FN *insn_name;
+#define CPU_INSN_NAME(cpu) ((cpu)->base.insn_name)
+
+  /* Trace data.  See sim-trace.h.  */
+  TRACE_DATA trace_data;
+#define CPU_TRACE_DATA(cpu) (& (cpu)->base.trace_data)
+
+  /* Maximum number of debuggable entities.
+     This debugging is not intended for normal use.
+     It is only enabled when the simulator is configured with --with-debug
+     which shouldn't normally be specified.  */
+#ifndef MAX_DEBUG_VALUES
+#define MAX_DEBUG_VALUES 4
+#endif
+
+  /* Boolean array of specified debugging flags.  */
+  char debug_flags[MAX_DEBUG_VALUES];
+#define CPU_DEBUG_FLAGS(cpu) ((cpu)->base.debug_flags)
+  /* Standard values.  */
+#define DEBUG_INSN_IDX 0
+#define DEBUG_NEXT_IDX 2 /* simulator specific debug bits begin here */
+
+  /* Debugging output goes to this or stderr if NULL.
+     We can't store `stderr' here as stderr goes through a callback.  */
+  FILE *debug_file;
+#define CPU_DEBUG_FILE(cpu) ((cpu)->base.debug_file)
+
+  /* Profile data.  See sim-profile.h.  */
+  PROFILE_DATA profile_data;
+#define CPU_PROFILE_DATA(cpu) (& (cpu)->base.profile_data)
+
+#ifdef SIM_HAVE_MODEL
+  /* Machine tables for this cpu.  See sim-model.h.  */
+  const MACH *mach;
+#define CPU_MACH(cpu) ((cpu)->base.mach)
+  /* The selected model.  */
+  const MODEL *model;
+#define CPU_MODEL(cpu) ((cpu)->base.model)
+  /* Model data (profiling state, etc.).  */
+  void *model_data;
+#define CPU_MODEL_DATA(cpu) ((cpu)->base.model_data)
+#endif
+
+  /* Routines to fetch/store registers.  */
+  CPUREG_FETCH_FN *reg_fetch;
+#define CPU_REG_FETCH(c) ((c)->base.reg_fetch)
+  CPUREG_STORE_FN *reg_store;
+#define CPU_REG_STORE(c) ((c)->base.reg_store)
+  PC_FETCH_FN *pc_fetch;
+#define CPU_PC_FETCH(c) ((c)->base.pc_fetch)
+  PC_STORE_FN *pc_store;
+#define CPU_PC_STORE(c) ((c)->base.pc_store)
+
+} sim_cpu_base;
+
+/* Create all cpus.  */
+extern SIM_RC sim_cpu_alloc_all (SIM_DESC, int, int);
+/* Create a cpu.  */
+extern sim_cpu *sim_cpu_alloc (SIM_DESC, int);
+/* Release resources held by all cpus.  */
+extern void sim_cpu_free_all (SIM_DESC);
+/* Release resources held by a cpu.  */
+extern void sim_cpu_free (sim_cpu *);
+
+/* Return a pointer to the cpu data for CPU_NAME, or NULL if not found.  */
+extern sim_cpu *sim_cpu_lookup (SIM_DESC, const char *);
+
+/* Get/set a pc value.  */
+#define CPU_PC_GET(cpu) ((* CPU_PC_FETCH (cpu)) (cpu))
+#define CPU_PC_SET(cpu,newval) ((* CPU_PC_STORE (cpu)) ((cpu), (newval)))
+/* External interface to accessing the pc.  */
+sim_cia sim_pc_get (sim_cpu *);
+void sim_pc_set (sim_cpu *, sim_cia);
+
+#endif /* SIM_CPU_H */