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/* $NetBSD: mips_opcode.h,v 1.4 1994/10/26 21:09:46 cgd 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.
*
* @(#)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
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