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+++ b/packages/hal/openrisc/arch/current/include/openrisc_opcode.h
@@ -0,0 +1,94 @@
+//=============================================================================
+//
+//      openrisc_opcode.h
+//
+//  Define the instruction formats and opcode values for the OpenRISC
+//  instruction set...or at least just enough of them to implement
+//  single-stepping.
+//
+//=============================================================================
+//####ECOSGPLCOPYRIGHTBEGIN####
+// -------------------------------------------
+// This file is part of eCos, the Embedded Configurable Operating System.
+// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
+//
+// eCos 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.
+//
+// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,
+// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+//
+// As a special exception, if other files instantiate templates or use macros
+// or inline functions from this file, or you compile this file and link it
+// with other works to produce a work based on this file, this file does not
+// by itself cause the resulting work to be covered by the GNU General Public
+// License. However the source code for this file must still be made available
+// in accordance with section (3) of the GNU General Public License.
+//
+// This exception does not invalidate any other reasons why a work based on
+// this file might be covered by the GNU General Public License.
+//
+// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
+// at http://sources.redhat.com/ecos/ecos-license/
+// -------------------------------------------
+//####ECOSGPLCOPYRIGHTEND####
+//=============================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):   sfurman
+// Contributors:
+// Date:        2003-02-28
+// Purpose:     Allow dissection of OpenRISC instructions
+// Description: The types and macros defined here define the instruction
+//              formats of the OpenRISC instruction set...or at least the
+//              very limited subset necessary to allow single-stepping.
+//              
+//####DESCRIPTIONEND####
+//
+//=============================================================================
+
+#ifndef _OPENRISC_OPCODE_H
+#define _OPENRISC_OPCODE_H
+
+
+// Define the instruction formats.
+typedef union {
+    unsigned word;
+
+    // (Possibly conditional) relative jump w/ immediate displacement
+    struct {
+        unsigned op:      6;    // OP_J, OP_JAL, OP_BNF, or OP_BF
+        signed   target: 26;
+    } JType;
+
+    // Absolute jump w/ register contents used as PC target address
+    struct {
+        unsigned op:      6;	// OP_JR or OP_JALR
+        unsigned unused1:10;
+        unsigned rB:      5;	// Register containing new PC
+        unsigned unused2:11;
+    } JRType;
+
+} InstFmt;
+
+/*
+ * Values for the 'op' field.
+ */
+#define OP_J            0x00
+#define OP_JAL          0x01
+#define OP_BNF          0x03
+#define OP_BF           0x04
+#define OP_RFE          0x09
+#define OP_JR           0x11
+#define OP_JALR         0x12
+
+#endif  /* _OPENRISC_OPCODE_H */
+
+// EOF openrisc_opcode.h