/*  $NetBSD: mips_opcode.h,v 1.12 2005/12/11 12:18:09 christos 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. 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.
 *
 *  @(#)mips_opcode.h   8.1 (Berkeley) 6/10/93
 */

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

#include <endian.h>

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

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

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

    struct {
        unsigned op: 6;     /* always '0x11' */
        unsigned : 1;       /* always '1' */
        unsigned fmt: 4;
        unsigned ft: 5;
        unsigned fs: 5;
        unsigned fd: 5;
        unsigned func: 6;
    } 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     /* MIPS-II, for r4000 port */
#define OP_BNEL     025     /* MIPS-II, for r4000 port */
#define OP_BLEZL    026     /* MIPS-II, for r4000 port */
#define OP_BGTZL    027     /* MIPS-II, for r4000 port */

#define OP_DADDI    030     /* MIPS-II, for r4000 port */
#define OP_DADDIU   031     /* MIPS-II, for r4000 port */
#define OP_LDL      032     /* MIPS-II, for r4000 port */
#define OP_LDR      033     /* MIPS-II, for r4000 port */

#define OP_SPECIAL2 034     /* QED opcodes */
#define OP_SPECIAL3 037     /* mips32r2 opcodes */

#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     /* MIPS-II, for r4000 port */

#define OP_SB       050
#define OP_SH       051
#define OP_SWL      052
#define OP_SW       053
#define OP_SDL      054     /* MIPS-II, for r4000 port */
#define OP_SDR      055     /* MIPS-II, for r4000 port */
#define OP_SWR      056
#define OP_CACHE    057     /* MIPS-II, for r4000 port */

#define OP_LL       060
#define OP_LWC0     OP_LL   /* backwards source compatibility */
#define OP_LWC1     061
#define OP_LWC2     062
#define OP_LWC3     063
#define OP_LLD      064     /* MIPS-II, for r4000 port */
#define OP_LDC1     065
#define OP_LD       067     /* MIPS-II, for r4000 port */

#define OP_SC       070
#define OP_SWC0     OP_SC   /* backwards source compatibility */
#define OP_SWC1     071
#define OP_SWC2     072
#define OP_SWC3     073
#define OP_SCD      074     /* MIPS-II, for r4000 port */
#define OP_SDC1     075
#define OP_SD       077     /* MIPS-II, for r4000 port */

/*
 * 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     /* MIPS-II, for r4000 port */

#define OP_MFHI     020
#define OP_MTHI     021
#define OP_MFLO     022
#define OP_MTLO     023
#define OP_DSLLV    024     /* MIPS-II, for r4000 port */
#define OP_DSRLV    026     /* MIPS-II, for r4000 port */
#define OP_DSRAV    027     /* MIPS-II, for r4000 port */

#define OP_MULT     030
#define OP_MULTU    031
#define OP_DIV      032
#define OP_DIVU     033
#define OP_DMULT    034     /* MIPS-II, for r4000 port */
#define OP_DMULTU   035     /* MIPS-II, for r4000 port */
#define OP_DDIV     036     /* MIPS-II, for r4000 port */
#define OP_DDIVU    037     /* MIPS-II, for r4000 port */

#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     /* MIPS-II, for r4000 port */
#define OP_DADDU    055     /* MIPS-II, for r4000 port */
#define OP_DSUB     056     /* MIPS-II, for r4000 port */
#define OP_DSUBU    057     /* MIPS-II, for r4000 port */

#define OP_TGE      060     /* MIPS-II, for r4000 port */
#define OP_TGEU     061     /* MIPS-II, for r4000 port */
#define OP_TLT      062     /* MIPS-II, for r4000 port */
#define OP_TLTU     063     /* MIPS-II, for r4000 port */
#define OP_TEQ      064     /* MIPS-II, for r4000 port */
#define OP_TNE      066     /* MIPS-II, for r4000 port */

#define OP_DSLL     070     /* MIPS-II, for r4000 port */
#define OP_DSRL     072     /* MIPS-II, for r4000 port */
#define OP_DSRA     073     /* MIPS-II, for r4000 port */
#define OP_DSLL32   074     /* MIPS-II, for r4000 port */
#define OP_DSRL32   076     /* MIPS-II, for r4000 port */
#define OP_DSRA32   077     /* MIPS-II, for r4000 port */

/*
 * Values for the 'func' field when 'op' == OP_SPECIAL2.
 */
#define OP_MAD      000     /* QED */
#define OP_MADU     001     /* QED */
#define OP_MUL      002     /* QED */

/*
 * Values for the 'func' field when 'op' == OP_SPECIAL3.
 */
#define OP_EXT      000
#define OP_INS      004
#define OP_BSHFL    040

/*
 * Values for the 'shamt' field when OP_SPECIAL3 && func OP_BSHFL.
 */
#define OP_WSBH     002
#define OP_SEB      020
#define OP_SEH      030

/*
 * Values for the 'func' field when 'op' == OP_BCOND.
 */
#define OP_BLTZ     000
#define OP_BGEZ     001
#define OP_BLTZL    002     /* MIPS-II, for r4000 port */
#define OP_BGEZL    003     /* MIPS-II, for r4000 port */

#define OP_TGEI     010     /* MIPS-II, for r4000 port */
#define OP_TGEIU    011     /* MIPS-II, for r4000 port */
#define OP_TLTI     012     /* MIPS-II, for r4000 port */
#define OP_TLTIU    013     /* MIPS-II, for r4000 port */
#define OP_TEQI     014     /* MIPS-II, for r4000 port */
#define OP_TNEI     016     /* MIPS-II, for r4000 port */

#define OP_BLTZAL   020     /* MIPS-II, for r4000 port */
#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     /* MIPS-II, for r4000 port */
#define OP_MT       004
#define OP_DMT      005     /* MIPS-II, for r4000 port */
#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        /* MIPS-II, for r4000 port */
#define COPz_BCL_TRUE   0x02        /* MIPS-II, for r4000 port */
#define COPz_BCL_FALSE  0x00        /* MIPS-II, for r4000 port */