/*      $OpenBSD: mips_opcode.h,v 1.1 1997/02/06 16:02:43 pefo Exp $	*/

/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	from: @(#)mips_opcode.h	8.1 (Berkeley) 6/10/93
 */

/*
 * Define the instruction formats and opcode values for the
 * MIPS instruction set.
 */

/*
 * Define the instruction formats.
 */
typedef union {
	unsigned word;

#if BYTE_ORDER == LITTLE_ENDIAN
	struct {
		unsigned imm: 16;
		unsigned rt: 5;
		unsigned rs: 5;
		unsigned op: 6;
	} IType;

	struct {
		unsigned target: 26;
		unsigned op: 6;
	} JType;

	struct {
		unsigned func: 6;
		unsigned shamt: 5;
		unsigned rd: 5;
		unsigned rt: 5;
		unsigned rs: 5;
		unsigned op: 6;
	} RType;

	struct {
		unsigned func: 6;
		unsigned fd: 5;
		unsigned fs: 5;
		unsigned ft: 5;
		unsigned fmt: 4;
		unsigned : 1;		/* always '1' */
		unsigned op: 6;		/* always '0x11' */
	} FRType;
#endif
} InstFmt;

/*
 * Values for the 'op' field.
 */
#define OP_SPECIAL	000
#define OP_BCOND	001
#define OP_J		002
#define	OP_JAL		003
#define OP_BEQ		004
#define OP_BNE		005
#define OP_BLEZ		006
#define OP_BGTZ		007

#define OP_ADDI		010
#define OP_ADDIU	011
#define OP_SLTI		012
#define OP_SLTIU	013
#define OP_ANDI		014
#define OP_ORI		015
#define OP_XORI		016
#define OP_LUI		017

#define OP_COP0		020
#define OP_COP1		021
#define OP_COP2		022
#define OP_COP3		023
#define	OP_BEQL		024
#define	OP_BNEL		025
#define	OP_BLEZL	026
#define	OP_BGTZL	027

#define	OP_DADDI	030
#define	OP_DADDIU	031
#define	OP_LDL		032
#define	OP_LDR		033

#define	OP_LB		040
#define	OP_LH		041
#define OP_LWL		042
#define OP_LW		043
#define OP_LBU		044
#define OP_LHU		045
#define OP_LWR		046
#define	OP_LHU		045
#define	OP_LWR		046
#define	OP_LWU		047

#define OP_SB		050
#define OP_SH		051
#define OP_SWL		052
#define OP_SW		053
#define	OP_SDL		054
#define	OP_SDR		055
#define OP_SWR		056
#define	OP_CACHE	057

#define OP_LL		060
#define OP_LWC1		061
#define OP_LWC2		062
#define OP_LWC3		063
#define	OP_LLD		064
#define	OP_LD		067

#define OP_SC		070
#define OP_SWC1		071
#define OP_SWC2		072
#define OP_SWC3		073
#define	OP_SCD		074
#define	OP_SD		077

/*
 * Values for the 'func' field when 'op' == OP_SPECIAL.
 */
#define OP_SLL		000
#define OP_SRL		002
#define OP_SRA		003
#define OP_SLLV		004
#define OP_SRLV		006
#define OP_SRAV		007

#define OP_JR		010
#define OP_JALR		011
#define OP_SYSCALL	014
#define OP_BREAK	015
#define	OP_SYNC		017

#define OP_MFHI		020
#define OP_MTHI		021
#define OP_MFLO		022
#define OP_MTLO		023
#define	OP_DSLLV	024
#define	OP_DSRLV	026
#define	OP_DSRAV	027

#define OP_MULT		030
#define OP_MULTU	031
#define OP_DIV		032
#define OP_DIVU		033
#define	OP_DMULT	034
#define	OP_DMULTU	035
#define	OP_DDIV		036
#define	OP_DDIVU	037


#define OP_ADD		040
#define OP_ADDU		041
#define OP_SUB		042
#define OP_SUBU		043
#define OP_AND		044
#define OP_OR		045
#define OP_XOR		046
#define OP_NOR		047

#define OP_SLT		052
#define OP_SLTU		053
#define	OP_DADD		054
#define	OP_DADDU	055
#define	OP_DSUB		056
#define	OP_DSUBU	057

#define	OP_TGE		060
#define	OP_TGEU		061
#define	OP_TLT		062
#define	OP_TLTU		063
#define	OP_TEQ		064
#define	OP_TNE		066

#define	OP_DSLL		070
#define	OP_DSRL		072
#define	OP_DSRA		073
#define	OP_DSLL32	074
#define	OP_DSRL32	076
#define	OP_DSRA32	077

/*
 * Values for the 'func' field when 'op' == OP_BCOND.
 */
#define OP_BLTZ		000
#define OP_BGEZ		001
#define	OP_BLTZL	002
#define	OP_BGEZL	003

#define	OP_TGEI		010
#define	OP_TGEIU	011
#define	OP_TLTI		012
#define	OP_TLTIU	013
#define	OP_TEQI		014
#define	OP_TNEI		016

#define OP_BLTZAL	020
#define	OP_BLTZAL	020
#define OP_BGEZAL	021
#define OP_BLTZALL	022
#define	OP_BGEZALL	023

/*
 * Values for the 'rs' field when 'op' == OP_COPz.
 */
#define OP_MF		000
#define	OP_DMF		001
#define OP_MT		004
#define	OP_DMT		005
#define OP_BCx		010
#define OP_BCy		014
#define OP_CF		002
#define OP_CT		006

/*
 * Values for the 'rt' field when 'op' == OP_COPz.
 */
#define COPz_BC_TF_MASK	0x01
#define COPz_BC_TRUE	0x01
#define COPz_BC_FALSE	0x00
#define COPz_BCL_TF_MASK	0x02
#define COPz_BCL_TRUE	0x02
#define COPz_BCL_FALSE	0x00