1 /* 2 3 Copyright 2021, dettus@dettus.net 4 5 Redistribution and use in source and binary forms, with or without modification, 6 are permitted provided that the following conditions are met: 7 8 1. Redistributions of source code must retain the above copyright notice, this 9 list of conditions and the following disclaimer. 10 11 2. Redistributions in binary form must reproduce the above copyright notice, 12 this list of conditions and the following disclaimer in the documentation 13 and/or other materials provided with the distribution. 14 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 16 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE 19 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 22 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 23 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 26 27 */ 28 29 #ifndef VM68K_DECODE_H 30 #define VM68K_DECODE_H 31 //#define DEBUG_PRINT 32 #include "vm68k_datatypes.h" 33 34 35 // this data structure makes the decoding process easier to read. 36 typedef enum _tVM68k_instruction 37 { 38 VM68K_INST_UNKNOWN=0, 39 VM68K_INST_ABCD, //1100xxx10000myyy 40 VM68K_INST_ADD, //1101 rrro oomm myyy 41 VM68K_INST_ADDA, //1101 rrro oomm myyy 42 VM68K_INST_ADDI, //0000 0110 ssmm myyy 43 VM68K_INST_ADDQ, //0101 ddd0 ssmm myyy 44 VM68K_INST_ADDX, //1101 xxx1 ss00 myyy 45 VM68K_INST_AND, //1100 xxxo oomm myyy 46 VM68K_INST_ANDI, //0000 0010 ssmm myyy 47 VM68K_INST_ANDItoCCR, //0000 0010 0011 1100 00000000dddddddd 48 VM68K_INST_ANDItoSR, //0000 0010 0111 1100 dddddddddddddddd 49 VM68K_INST_ASL_ASR, //1110 cccd ssl0 0yyy 50 VM68K_INST_BCC, //0110 CCCC dddd dddd 51 VM68K_INST_BCHG, //0000 xxx1 01mm myyy 52 VM68K_INST_BCHGB, //0000 1000 10mm myyy 53 VM68K_INST_BCLR, //0000 xxx1 10mm myyy 54 VM68K_INST_BCLRI, //0000xxx110mmmyyy 55 VM68K_INST_BRA, //0110 0000 dddd dddd 56 VM68K_INST_BSET, //0000 xxx1 11mm myyy 57 VM68K_INST_BSETB, //0000 1000 11mm myyy 58 // VM68K_INST_BSR, //01100001dddddddd 59 VM68K_INST_BTST, //0000 xxx1 00mm myyy 60 VM68K_INST_BTSTB, //0000 1000 00mm myyy 61 VM68K_INST_CHK, //0100xxxss0mmmyyy 62 VM68K_INST_CLR, //0100 0010 ssmm myyy 63 VM68K_INST_CMP, //1011 xxxo oomm myyy 64 VM68K_INST_CMPA, //1011 xxxo oomm myyy 65 VM68K_INST_CMPI, //0000 1100 ssmm myyy 66 VM68K_INST_CMPM, //1011 xxx1 ss00 1yyy 67 VM68K_INST_DBcc, //0101 CCCC 1100 1yyy 68 VM68K_INST_DIVS, //1000xxx111mmmyyy 69 VM68K_INST_DIVU, //1000xxx011mmmyyy 70 VM68K_INST_EOR, //1011 xxxo oomm myyy 71 VM68K_INST_EORI, //0000 1010 ssmm myyy 72 VM68K_INST_EORItoCCR, //0000 1010 0011 1100 00000000dddddddd 73 VM68K_INST_EORItoSR, //0000 1010 0111 1100 dddddddddddddddd 74 VM68K_INST_EXG, //1100 xxx1 oooo oyyy 75 VM68K_INST_EXT, //0100 100o oo00 0yyy 76 VM68K_INST_ILLEGAL, //0100101011111100 77 VM68K_INST_JMP, //0100 1110 11mm myyy 78 VM68K_INST_JSR, //0100 1110 10mm myyy 79 VM68K_INST_LEA, //0100 xxx1 11mm myyy 80 VM68K_INST_LINK, //0100111001010yyydddddddddddddddd 81 VM68K_INST_LSL_LSR, //1110 cccd ssl0 1yyy 82 VM68K_INST_MOVE, //00ss xxxm mmMM Myyy 83 VM68K_INST_MOVEA, //00ss xxx0 01mm myyy 84 VM68K_INST_MOVEtoCCR, //0100010011mmmyyy 85 VM68K_INST_MOVEfromSR, //0100000011mmmyyy 86 VM68K_INST_MOVEtoSR, //0100011011mmmyyy 87 VM68K_INST_MOVEUSP, //010011100110dyyy 88 VM68K_INST_MOVEMregtomem, //0100 1d00 1smm myyy 89 VM68K_INST_MOVEMmemtoreg, //0100 1d00 1smm myyy 90 VM68K_INST_MOVEP, //0000xxxooo001yyydddddddddddddddd 91 VM68K_INST_MOVEQ, //0111xxx0dddddddd 92 VM68K_INST_MULS, //1100xxx111mmmyyy 93 VM68K_INST_MULU, //1100xxx011mmmyyy!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 94 VM68K_INST_NBCD, //1100xxx011mmmyyy!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 95 VM68K_INST_NEG, //0100 0100 ssmm myyy 96 VM68K_INST_NEGX, //0100 0000 ssmm myyy 97 VM68K_INST_NOP, //0100 1110 0111 0001 98 VM68K_INST_NOT, //0100 0110 ssmm myyy 99 VM68K_INST_OR, //1000 xxxo oomm myyy 100 VM68K_INST_ORI, //0000 0000 ssmm myyy 101 VM68K_INST_ORItoCCR, //0000 0000 0011 1100 00000000dddddddd 102 VM68K_INST_ORItoSR, //0000 0000 0111 1100 dddddddddddddddd 103 VM68K_INST_PEA, //0100 1000 01mm myyy 104 VM68K_INST_RESET, //0100111001110000 105 VM68K_INST_ROL_ROR, //1110 cccd ssl1 1yyy 106 VM68K_INST_ROXL_ROXR, //1110 cccd ssl1 0yyy 107 VM68K_INST_RTE, //0100 1110 0111 0011 108 VM68K_INST_RTR, //0100 1110 0111 0111 109 VM68K_INST_RTS, //0100 1110 0111 0101 110 VM68K_INST_SBCD, //1000xxx10000ryyy 111 VM68K_INST_SCC, //0101 CCCC 11mm myyy 112 VM68K_INST_STOP, //0100111001110010iiiiiiiiiiiiiiii 113 VM68K_INST_SUB, //1001 xxxo oomm myyy 114 VM68K_INST_SUBA, //1001 xxxo oomm myyy 115 VM68K_INST_SUBI, //0000 0100 ssmm myyy 116 VM68K_INST_SUBQ, //0101 ddd1 ssmm myyy 117 VM68K_INST_SUBX, //1001 yyy1 ss00 ryyy 118 VM68K_INST_SWAP, //0100100001000yyy 119 VM68K_INST_TAS, //0100101011mmmyyy 120 VM68K_INST_TRAP, //010011100100vvvv 121 VM68K_INST_TRAPV, //0100111001110110 122 VM68K_INST_TST, //0100 1010 ssmm myyy 123 VM68K_INST_UNLK, //0100111001011yyy 124 } tVM68k_instruction; 125 126 127 128 // opcodes are 16 bit values, this function translates them into an easier-to-handle enumeration. 129 tVM68k_instruction vm68k_decode(tVM68k_uword opcode); 130 131 #ifdef DEBUG_PRINT 132 // this function is for translating the enumeration into something human-readable. 133 void vm68k_get_instructionname(tVM68k_instruction instruction,char* name); 134 #endif 135 136 #endif 137