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annotate 68kinst.h @ 0:2432d177e1ac

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Initial work on M68K instruction decoding
author Mike Pavone <pavone@retrodev.com>
date Mon, 29 Oct 2012 01:18:38 -0700
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children 5df303bf72e6
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1 #include <stdint.h>
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2
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3 typedef enum {
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4 BIT_MOVEP_IMMED = 0,
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5 MOVE_BYTE,
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6 MOVE_LONG,
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7 MOVE_WORD,
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8 MISC,
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9 QUICK_ARITH_LOOP,
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10 BRANCH,
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11 MOVEQ,
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12 OR_DIV_SBCD,
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13 SUB_SUBX,
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14 RESERVED,
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15 CMP_XOR,
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16 AND_MUL_ABCD_EXG,
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17 ADD_ADDX,
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18 SHIFT_ROTATE,
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19 COPROC
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20 } m68k_optypes;
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21
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22 typedef enum {
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23 M68K_ABCD,
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24 M68K_ADD,
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25 M68K_ADDX,
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26 M68K_AND,
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27 M68K_ANDI_CCR,
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28 M68K_ANDI_SR,
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29 M68K_ASL,
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30 M68K_ASR,
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31 M68K_BCC,
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32 M68K_BCHG,
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33 M68K_BCLR,
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34 M68K_BSET,
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35 M68K_BSR,
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36 M68K_BTST,
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37 M68K_CHK,
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38 M68K_CLR,
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39 M68K_CMP,
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40 M68K_DBCC,
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41 M68K_DIVS,
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42 M68K_DIVU,
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43 M68K_EOR,
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44 M68K_EORI_CCR,
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45 M68K_EORI_SR,
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46 M68K_EXG,
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47 M68K_EXT,
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48 M68K_ILLEGAL,
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49 M68K_JMP,
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50 M68K_JSR,
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51 M68K_LEA,
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52 M68K_LINK
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53 M68K_LSL,
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54 M68K_LSR,
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55 M68K_MOVE,
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56 M68K_MOVE_CCR,
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57 M68K_MOVE_FROM_SR,
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58 M68K_MOVE_SR,
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59 M68K_MOVE_USP,
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60 M68K_MOVEM,
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61 M68K_MOVEP,
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62 M68K_MULS,
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63 M68K_MULU,
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64 M68K_NBCD,
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65 M68K_NEG,
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66 M68K_NEGX,
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67 M68K_NOP,
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68 M68K_NOT,
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69 M68K_OR,
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70 M68K_ORI_CCR,
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71 M68K_ORI_SR,
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72 M68K_PEA,
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73 M68K_RESET,
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74 M68K_ROL,
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75 M68K_ROR,
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76 M68K_ROXL,
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77 M68K_ROXR,
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78 M68K_RTE,
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79 M68K_RTR,
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80 M68K_RTS,
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81 M68K_SBCD,
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82 M68K_SCC,
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83 M68K_STOP,
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84 M68K_SUB,
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85 M68K_SUBX,
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86 M68K_SWAP,
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87 M68K_TAS,
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88 M68K_TRAP,
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89 M68k_TRAPV
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90 M68K_TST,
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91 M68K_UNLNK
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92 } m68K_op;
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93
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94 typedef enum {
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95 VAR_NORMAL,
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96 VAR_QUICK
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97 } m68K_variant;
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98
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99 typedef enum {
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100 OPSIZE_BYTE=0,
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101 OPSIZE_WORD,
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102 OPSIZE_LONG
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103 } m68K_opsizes;
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104
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105 typedef enum {
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106 MODE_REG = 0,
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107 MODE_AREG,
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108 MODE_AREG_INDIRECT,
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109 MODE_AREG_POSTINC,
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110 MODE_AREG_PREDEC,
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111 MODE_AREG_DISPLACE,
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112 MODE_AREG_INDEX_MEM, //bunch of relatively complicated modes
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113 MODE_PC_INDIRECT_ABS_IMMED //Modes that use the program counter, an absolute address or immediate value
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114 } m68k_addr_modes;
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115
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116 typedef enum {
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117 MODE_ABSOLUTE=0,
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118 MODE_PC_DISPLACE,
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119 MODE_PC_INDEX,
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120 MODE_IMMEDIATE
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121 } m68k_addr_extended;
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122
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123 typedef struct {
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124 uint8_t addr_mode;
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125 union {
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126 struct {
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127 uint8_t pri;
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128 uint8_t sec;
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129 int32_t displacement;
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130 } regs;
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131 uint8_t u8;
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132 uint16_t u16;
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133 uint32_t u32;
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134 } params;
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135 } m68k_op_info;
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136
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137 typedef struct {
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138 uint8_t op;
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139 uint8_t variant;
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140 union {
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141 uint8_t size;
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142 uint8_t cond;
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143 } extra;
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144 m68k_op_info src;
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145 m68k_op_info dst;
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146 } m68kinst;
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147
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148 uint16_t * m68K_decode(uint16_t * istream, m68kinst * dst);
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149 uint32_t m68k_cycles(m68kinst * inst);
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150