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diff --git a/sim/m32r/arch.h b/sim/m32r/arch.h
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+/* Simulator header for m32r.
+
+Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
+
+This file is part of the GNU Simulators.
+
+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.
+
+*/
+
+#ifndef M32R_ARCH_H
+#define M32R_ARCH_H
+
+#define MAX_INSNS 128
+
+#define TARGET_BIG_ENDIAN 1
+
+/* Shorthand macro for fetching registers.  */
+#define CPU(x) (CPU_CGEN_HW (current_cpu)->x)
+
+/* Macros to determine which cpus are supported.  */
+#define HAVE_CPU_M32R
+
+/* Enum declaration for mode types.  */
+typedef enum mode_type {
+  MODE_VM, MODE_BI, MODE_QI, MODE_HI,
+  MODE_SI, MODE_DI, MODE_UBI, MODE_UQI,
+  MODE_UHI, MODE_USI, MODE_UDI, MODE_SF,
+  MODE_DF, MODE_XF, MODE_TF, MODE_MAX
+} MODE_TYPE;
+
+#define MAX_MODES ((int) MODE_MAX)
+
+/* Return name of instruction numbered INSN.  */
+#define INSN_NAME(insn) (m32r_cgen_insn_table_entries[insn].name)
+
+/* Enum declaration for model types.  */
+typedef enum model_type {
+  MODEL_M32R_D, MODEL_TEST, MODEL_MAX
+} MODEL_TYPE;
+
+#define MAX_MODELS ((int) MODEL_MAX)
+
+/* Enum declaration for unit types.  */
+typedef enum unit_type {
+  UNIT_NONE, UNIT_M32R_D_U_STORE, UNIT_M32R_D_U_LOAD, UNIT_M32R_D_U_EXEC,
+  UNIT_TEST_U_EXEC, UNIT_MAX
+} UNIT_TYPE;
+
+#define MAX_UNITS (1)
+
+#endif /* M32R_ARCH_H */