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//=============================================================================
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//
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// openrisc_opcode.h
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//
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// Define the instruction formats and opcode values for the OpenRISC
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// instruction set...or at least just enough of them to implement
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// single-stepping.
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//
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//=============================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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//
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// This exception does not invalidate any other reasons why a work based on
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// this file might be covered by the GNU General Public License.
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-license/
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//=============================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): sfurman
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// Contributors:
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// Date: 2003-02-28
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// Purpose: Allow dissection of OpenRISC instructions
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// Description: The types and macros defined here define the instruction
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// formats of the OpenRISC instruction set...or at least the
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// very limited subset necessary to allow single-stepping.
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//
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//####DESCRIPTIONEND####
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//
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//=============================================================================
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#ifndef _OPENRISC_OPCODE_H
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#define _OPENRISC_OPCODE_H
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// Define the instruction formats.
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typedef union {
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unsigned word;
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// (Possibly conditional) relative jump w/ immediate displacement
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struct {
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unsigned op: 6; // OP_J, OP_JAL, OP_BNF, or OP_BF
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signed target: 26;
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} JType;
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// Absolute jump w/ register contents used as PC target address
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struct {
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unsigned op: 6; // OP_JR or OP_JALR
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unsigned unused1:10;
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unsigned rB: 5; // Register containing new PC
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unsigned unused2:11;
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} JRType;
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} InstFmt;
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/*
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* Values for the 'op' field.
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*/
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#define OP_J 0x00
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#define OP_JAL 0x01
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#define OP_BNF 0x03
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#define OP_BF 0x04
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#define OP_RFE 0x09
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#define OP_JR 0x11
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#define OP_JALR 0x12
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#endif /* _OPENRISC_OPCODE_H */
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