usr/src/sys/pmax/include/mips_opcode.h

/*-
 * 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.
 *
 *      @(#)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_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_SB           050
#define OP_SH           051
#define OP_SWL          052
#define OP_SW           053
#define OP_SWR          056

#define OP_LWC0         060
#define OP_LWC1         061
#define OP_LWC2         062
#define OP_LWC3         063

#define OP_SWC0         070
#define OP_SWC1         071
#define OP_SWC2         072
#define OP_SWC3         073

/*
 * 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_MFHI         020
#define OP_MTHI         021
#define OP_MFLO         022
#define OP_MTLO         023

#define OP_MULT         030
#define OP_MULTU        031
#define OP_DIV          032
#define OP_DIVU         033

#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

/*
 * Values for the 'func' field when 'op' == OP_BCOND.
 */
#define OP_BLTZ         000
#define OP_BGEZ         001
#define OP_BLTZAL       020
#define OP_BGEZAL       021

/*
 * Values for the 'rs' field when 'op' == OP_COPz.
 */
#define OP_MF           000
#define OP_MT           004
#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