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409
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1 /*
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2 insn.c
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3
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4 Copyright © 2010 William Astle
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5
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6 This file is part of LWTOOLS.
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7
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8 LWTOOLS is free software: you can redistribute it and/or modify it under the
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9 terms of the GNU General Public License as published by the Free Software
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10 Foundation, either version 3 of the License, or (at your option) any later
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11 version.
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12
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13 This program is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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16 more details.
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17
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18 You should have received a copy of the GNU General Public License along with
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19 this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #include <config.h>
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23
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24 #include <stdio.h>
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25 #include <stdlib.h>
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26 #include <string.h>
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27
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28 #include <lw_alloc.h>
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29 #include <lw_string.h>
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30
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31 #include "lwdisasm.h"
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32
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33 /*
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34 this function creates a linedata_t with the disassembly of the
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35 current location; returns NULL if the current disassembly point
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36 is not a valid instruction or we are at the end of the input
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37 */
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38
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39 #define fb(d) do { int ____t; ____t = fetch_byte(as); if (____t < 0) return NULL; bytes[len++] = ____t; (d) = ____t; } while (0)
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40 #define fb2(d) do { int ____t; ____t = fetch_byte(as); if (____t < 0) return "?"; bytes[(*len)++] = ____t; (d) = ____t; } while (0)
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41
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42 char *encode_target(disasmstate_t *as, int addr, int section)
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43 {
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44 symbol_t *s;
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45 static char buffer[256];
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46
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47 s = find_symbol(as, addr, section);
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48 if (!s)
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49 {
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50 sprintf(buffer, "$%04X", addr);
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51 return buffer;
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52 }
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53 else
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54 {
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55 return s -> symbol;
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56 }
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57 }
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58
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59 char *decode_indexed(disasmstate_t *as, char *bytes, int *len, int *target, int section)
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60 {
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61 int pb, b1, b2;
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62 int rn;
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63 static char *rs[] = { "x", "y", "u", "s", "pcr" };
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64 static char str[40];
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65 char *i1 = "", *i2 = "";
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66 char *tstr;
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67 *target = -1;
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68
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69 fb2(pb);
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70
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71 rn = (pb >> 5) & 3;
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72
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73 if (pb < 0x80)
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74 {
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75 // 5 bit
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76 b1 = pb & 15;
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77 if (pb & 16)
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78 b1 = b1 - 16;
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79
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80 sprintf(str, "%d,%s", b1, rs[rn]);
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81 return str;
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82 }
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83 if ((pb & 0x1F) == 0x1F)
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84 {
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85 // extended indirect
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86 fb2(b1);
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87 fb2(b2);
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88 sprintf(str, "[$%04X]", (b1 << 8) | b2);
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89 return str;
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90 }
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91
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92 if (pb & 0x10)
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93 {
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94 i1 = "[";
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95 i2 = "]";
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96 }
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97
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98 switch (pb & 0x0F)
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99 {
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100 case 0: // ,r+
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101 if (*i1 == '[')
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102 {
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103 break;
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104 }
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105 sprintf(str, "%s,%s+%s", i1, rs[rn], i2);
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106 return str;
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107
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108 case 1: // ,r++
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109 sprintf(str, "%s,%s++%s", i1, rs[rn], i2);
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110 return str;
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111
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112 case 2: // ,-r
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113 if (*i1 == '[')
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114 {
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115 break;
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116 }
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117 sprintf(str, "%s,-%s%s", i1, rs[rn], i2);
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118 return str;
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119
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120 case 3: // ,--r
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121 sprintf(str, "%s,--%s%s", i1, rs[rn], i2);
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122 return str;
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123
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124 case 4: // ,r
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125 sprintf(str, "%s,%s%s", i1, rs[rn], i2);
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126 return str;
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127
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128 case 5: // B,r
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129 sprintf(str, "%sb,%s%s", i1, rs[rn], i2);
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130 return str;
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131
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132 case 6: // A,r
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133 sprintf(str, "%sa,%s%s", i1, rs[rn], i2);
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134 return str;
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135
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136 case 8: // 8 bit,r
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137 fb2(b1);
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138 if (b1 > 128)
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139 b1 -= 256;
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140 sprintf(str, "%s<$%02X,%s%s", i1, b1, rs[rn], i2);
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141 return str;
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142
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143 case 9: // 16 bit,r
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144 fb2(b1);
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145 fb2(b2);
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146 b1 = (b1 << 8) | b2;
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147 if (b2 > 32768)
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148 b2 -= 65536;
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149 sprintf(str, "%s>$%04X,%s%s", i1, b1, rs[rn], i2);
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150 return str;
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151
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152 case 11: // D,r
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153 sprintf(str, "%sd,%s%s", i1, rs[rn], i2);
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154 return str;
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155
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156 case 12: // 8 bit,PCR
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157 fb2(b1);
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158 if (b1 > 127)
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159 b1 -= 256;
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160 b1 += as -> curoff;
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161 b1 &= 0xFFFF;
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162 sprintf(str, "%s<%s,pcr%s", i1, encode_target(as, b1, section), i2);
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163 *target = b1;
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164 return str;
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165
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166 case 13: // 16 bit,PCR
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167 fb2(b1);
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168 fb2(b2);
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169 b1 = (b1 << 8) | b2;
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170 b1 += as -> curoff;
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171 b1 &= 0xFFFF;
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172 sprintf(str, "%s>%s,pcr%s", i1, encode_target(as, b1, section), i2);
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173 *target = b1;
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174 return str;
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175 }
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176
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177 // if we got here, we have an illegal 6809
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178 if (as -> target == TARGET_6809)
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179 {
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180 sprintf(str, "?");
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181 return str;
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182 }
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183
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184 // now sort out 6309 operations
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185 pb &= 0x1F;
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186
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187 switch (pb)
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188 {
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189 case 0x07:
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190 case 0x17:
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191 // E,r
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192 sprintf(str, "%se,%s%s", i1, rs[rn], i2);
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193 return str;
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194
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195 case 0x0A:
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196 case 0x1A:
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197 // F,r
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198 sprintf(str, "%sf,%s%s", i1, rs[rn], i2);
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199 return str;
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200
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201 case 0x0E:
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202 case 0x1E:
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203 // W,r
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204 sprintf(str, "%sw,%s%s", i1, rs[rn], i2);
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205 return str;
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206
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207 case 0x0F:
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208 case 0x10:
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209 // W indexing
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210 switch (rn)
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211 {
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212 case 0: // ,W
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213 sprintf(str, "%s,w%s", i1, i2);
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214 return str;
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215
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216 case 1: // 16 bit,W
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217 fb2(b1);
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218 fb2(b2);
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219 b1 = (b1 << 8) | b2;
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220 if (b1 > 32768)
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221 b1 -= 65536;
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222 sprintf(str, "%s>$%04X,w%s", i1, b1, i2);
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223 return str;
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224
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225 case 2: // ,W++
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226 sprintf(str, "%s,w++%s", i1, i2);
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227 return str;
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228
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229 case 3: // ,--W
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230 sprintf(str, "%s,--w%s", i1, i2);
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231 return str;
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232 }
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233 }
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234
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235 sprintf(str, "?");
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236 return str;
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237 }
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238
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239 char *decode_operand(disasmstate_t *as, int addrmode, uint8_t *bytes, int *len, int *target, int section)
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240 {
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241 int b1, b2, b3, b4;
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242 static char insnbuffer[256];
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243 char *t;
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244 static char *rlist3[] = { "D", "X", "Y", "U", "S", "PC", "W", "V", "A", "B", "CC", "DP", "0", "0", "E", "F" };
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245 static char *rlist8[] = { "D", "X", "Y", "U", "S", "PC", "?", "?", "A", "B", "CC", "DP", "?", "?", "?", "?" };
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246 char **rlist = (as -> target == TARGET_6809) ? rlist8 : rlist3;
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247
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248 switch (addrmode)
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249 {
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250 case ADDR_IMM8:
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251 fb2(b1);
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252 sprintf(insnbuffer, "#$%02X", b1);
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253 break;
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254
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255 case ADDR_IMM16:
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256 fb2(b1);
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257 fb2(b2);
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258 sprintf(insnbuffer, "#$%04X", (b1 << 8) | b2);
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259 break;
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260
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261 case ADDR_IMM32:
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262 fb2(b1);
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263 fb2(b2);
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264 fb2(b3);
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265 fb2(b4);
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266 sprintf(insnbuffer, "#$%08X", (b1 << 24) | (b2 << 16) | (b3 << 8) | b4);
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267 break;
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268
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269 case ADDR_DIR:
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270 fb2(b1);
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271 sprintf(insnbuffer, "<%s", encode_target(as, (as -> dpval << 8) | b1, section));
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272 *target = as -> dpval * 256 + b1;
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273 break;
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274
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275 case ADDR_EXT:
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276 fb2(b1);
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277 fb2(b2);
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278 sprintf(insnbuffer, ">%s", encode_target(as, (b1 << 8) | b2, section));
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279 *target = (b1 << 8) | b2;
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280 break;
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281
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282 case ADDR_INH:
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283 *insnbuffer = 0;
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284 break;
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285
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286 case ADDR_IMM8DIR:
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287 fb2(b1);
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288 fb2(b2);
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289 sprintf(insnbuffer, "#$%02X;<%s", b1, encode_target(as, (as -> dpval << 8) | b2, section));
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290 *target = (as -> dpval << 8) | b2;
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291 break;
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292
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293 case ADDR_IMM8EXT:
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294 fb2(b1);
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295 fb2(b2);
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296 fb2(b3);
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297 sprintf(insnbuffer, "#$%02X;>%s", b1, encode_target(as, (b2 << 8) | b3, section));
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298 *target = (b2 << 8) | b3;
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299 break;
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300
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301 case ADDR_IMM8IND:
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302 fb2(b1);
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303 t = decode_indexed(as, bytes, len, target, section);
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304 sprintf(insnbuffer, "#$%02X;%s", b1, t);
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305 break;
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306
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307 case ADDR_IND:
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308 t = decode_indexed(as, bytes, len, target, section);
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309 sprintf(insnbuffer, "%s", t);
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310 break;
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311
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312 case ADDR_RTOR:
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313 fb2(b1);
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314 b2 = b1 & 0x0F;
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315 b1 = b1 >> 4;
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316 sprintf(insnbuffer, "%s,%s", rlist[b1], rlist[b2]);
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317 break;
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318
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319 case ADDR_BITBIT:
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320 fb2(b1);
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321 fb2(b2);
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322 sprintf(insnbuffer, "%s,%d,%d;<%s",
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323 (b1 >> 6 == 0) ? "CC" : ((b1 >> 6 == 1) ? "A" : ((b1 >> 6 == 2) ? "B" : "?")),
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324 (b1 >> 3) & 7, b1 & 7, encode_target(as, (as -> dpval << 8) | b2, section));
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325 *target = (as -> dpval << 8) | b2;
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326 break;
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327
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328 case ADDR_PSHPULS:
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329 insnbuffer[0] = 0;
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330 fb2(b1);
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331 if (b1 & 0x01)
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332 {
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333 strcat(insnbuffer, ",cc");
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334 }
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335 if (b1 & 0x02)
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336 {
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337 strcat(insnbuffer, ",a");
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338 }
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339 if (b1 & 0x04)
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340 {
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341 strcat(insnbuffer, ",b");
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342 }
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343 if (b1 & 0x08)
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344 {
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345 strcat(insnbuffer, ",dp");
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346 }
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347 if (b1 & 0x10)
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348 {
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349 strcat(insnbuffer, "x");
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350 }
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351 if (b1 & 0x20)
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352 {
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353 strcat(insnbuffer, "y");
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354 }
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355 if (b1 & 0x40)
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356 {
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357 strcat(insnbuffer, "u");
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358 }
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359 if (b1 & 0x80)
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360 {
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361 strcat(insnbuffer, "pc");
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362 }
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363 return insnbuffer + 1;
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364 break;
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365
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366 case ADDR_PSHPULU:
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367 insnbuffer[0] = 0;
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368 fb2(b1);
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369 if (b1 & 0x01)
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370 {
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371 strcat(insnbuffer, ",cc");
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372 }
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373 if (b1 & 0x02)
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374 {
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375 strcat(insnbuffer, ",a");
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376 }
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377 if (b1 & 0x04)
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378 {
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379 strcat(insnbuffer, ",b");
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380 }
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381 if (b1 & 0x08)
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382 {
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383 strcat(insnbuffer, ",dp");
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384 }
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385 if (b1 & 0x10)
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386 {
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387 strcat(insnbuffer, "x");
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388 }
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389 if (b1 & 0x20)
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390 {
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391 strcat(insnbuffer, "y");
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392 }
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393 if (b1 & 0x40)
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394 {
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395 strcat(insnbuffer, "s");
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396 }
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397 if (b1 & 0x80)
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398 {
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399 strcat(insnbuffer, "pc");
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400 }
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401 return insnbuffer + 1;
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402
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403 case ADDR_REL8:
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404 fb2(b1);
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405 if (b1 > 127)
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406 b1 -= 256;
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407 b1 += as -> curoff;
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408 b1 &= 0xFFFF;
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409 sprintf(insnbuffer, "%s", encode_target(as, b1, section));
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410 *target = b1;
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411 break;
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412
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413 case ADDR_REL16:
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414 fb2(b1);
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415 if (b1 > 32767)
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416 b1 -= 65536;
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417 b1 += as -> curoff;
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418 b1 &= 0xFFFF;
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419 sprintf(insnbuffer, "%s", encode_target(as, b1, section));
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420 *target = b2;
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421 break;
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422
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423 case ADDR_TFMPP:
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424 fb2(b1);
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425 b2 = b1 & 0x0F;
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426 b1 >>= 4;
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427 sprintf(insnbuffer, "%s+,%s+", rlist[b1], rlist[b2]);
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428 break;
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429
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430 case ADDR_TFMMM:
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|
|
431 fb2(b1);
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432 b2 = b1 & 0x0F;
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433 b1 >>= 4;
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434 sprintf(insnbuffer, "%s-,%s-", rlist[b1], rlist[b2]);
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435 break;
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436
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437 case ADDR_TFMPC:
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|
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438 fb2(b1);
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439 b2 = b1 & 0x0F;
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440 b1 >>= 4;
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|
441 sprintf(insnbuffer, "%s+,%s", rlist[b1], rlist[b2]);
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|
442 break;
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|
443
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|
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444 case ADDR_TFMCP:
|
|
|
445 fb2(b1);
|
|
|
446 b2 = b1 & 0x0F;
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|
|
447 b1 >>= 4;
|
|
|
448 sprintf(insnbuffer, "%s,%s+", rlist[b1], rlist[b2]);
|
|
|
449 break;
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|
|
450
|
|
|
451 default:
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|
|
452 sprintf(insnbuffer, "????");
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|
|
453 break;
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|
|
454 }
|
|
|
455
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|
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456 return insnbuffer;
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|
|
457 }
|
|
|
458
|
|
|
459 linedata_t *disasm_insn(disasmstate_t *as)
|
|
|
460 {
|
|
|
461 int curbyte;
|
|
|
462 int b1;
|
|
|
463 linedata_t *l;
|
|
|
464 char *opcode;
|
|
|
465 int addrmode;
|
|
|
466 char insnbuffer[256];
|
|
|
467 char *t;
|
|
|
468 int addr;
|
|
|
469 int len = 0;
|
|
|
470 int8_t bytes[10];
|
|
|
471 int target = -1;
|
|
|
472
|
|
|
473 addr = as -> curoff;
|
|
|
474
|
|
|
475 fb(curbyte);
|
|
|
476 if (curbyte < 0)
|
|
|
477 return NULL;
|
|
|
478
|
|
|
479 opcode = as->page0[curbyte].op;
|
|
|
480 addrmode = as->page0[curbyte].addrmode;
|
|
|
481
|
|
|
482 if (addrmode == ADDR_PAGE1)
|
|
|
483 {
|
|
|
484 fb(b1);
|
|
|
485 if (b1 < 0)
|
|
|
486 return NULL;
|
|
|
487 opcode = as->page1[b1].op;
|
|
|
488 addrmode = as->page1[b1].addrmode;
|
|
|
489 curbyte = (curbyte << 8) | b1;
|
|
|
490 }
|
|
|
491 else if (addrmode == ADDR_PAGE2)
|
|
|
492 {
|
|
|
493 fb(b1);
|
|
|
494 if (b1 < 0)
|
|
|
495 return NULL;
|
|
|
496 opcode = as->page2[b1].op;
|
|
|
497 addrmode = as->page2[b1].addrmode;
|
|
|
498 curbyte = (curbyte << 8) | b1;
|
|
|
499 }
|
|
|
500
|
|
|
501 if (opcode == NULL)
|
|
|
502 return NULL;
|
|
|
503
|
|
|
504 t = decode_operand(as, addrmode, bytes, &len, &target, 0);
|
|
|
505
|
|
|
506 if (!t)
|
|
|
507 return NULL;
|
|
|
508
|
|
|
509 // now create the line structure
|
|
|
510 l = lw_alloc(sizeof(linedata_t));
|
|
|
511 l -> next = NULL;
|
|
|
512 l -> prev = NULL;
|
|
|
513 l -> address = addr;
|
|
|
514 l -> type = type_code;
|
|
|
515 l -> length = len;
|
|
|
516 l -> bytes = lw_alloc(len);
|
|
|
517 memmove(l -> bytes, bytes, len);
|
|
|
518 l -> isref = 0;
|
|
|
519 l -> symbol = NULL;
|
|
|
520 l -> sectionref = 0;
|
|
|
521 sprintf(insnbuffer, "%s %s", opcode, t);
|
|
|
522 l -> disasm = lw_strdup(insnbuffer);
|
|
|
523 l -> target = target;
|
|
|
524 return l;
|
|
|
525 }
|
|
|
526
|
|
|
527 void redisasm_insn(disasmstate_t *as, linedata_t *l)
|
|
|
528 {
|
|
|
529 char *opcode;
|
|
|
530 int addrmode;
|
|
|
531 int len = 0;
|
|
|
532 char bytes[15];
|
|
|
533 int target = -1;
|
|
|
534 char *t;
|
|
|
535 char insnbuf[256];
|
|
|
536 int ta;
|
|
|
537 int ts;
|
|
|
538
|
|
|
539 // short circuit if no target in this one
|
|
|
540 if (l -> target == -1)
|
|
|
541 return;
|
|
|
542
|
|
|
543 opcode = as -> page0[l -> bytes[0]].op;
|
|
|
544 addrmode = as -> page0[l -> bytes[0]].addrmode;
|
|
|
545
|
|
|
546 ta = as -> curoff;
|
|
|
547 as -> curoff = l -> address + 1;
|
|
|
548
|
|
|
549 if (addrmode == ADDR_PAGE1)
|
|
|
550 {
|
|
|
551 opcode = as -> page1[l -> bytes[1]].op;
|
|
|
552 addrmode = as -> page1[l -> bytes[1]].addrmode;
|
|
|
553 as -> curoff++;
|
|
|
554 }
|
|
|
555 else if (addrmode == ADDR_PAGE2)
|
|
|
556 {
|
|
|
557 opcode = as -> page2[l -> bytes[1]].op;
|
|
|
558 addrmode = as -> page2[l -> bytes[1]].addrmode;
|
|
|
559 as -> curoff++;
|
|
|
560 }
|
|
|
561
|
|
|
562 t = decode_operand(as, addrmode, bytes, &len, &target, l -> sectionref);
|
|
|
563
|
|
|
564 // now create the line structure
|
|
|
565 lw_free(l -> disasm);
|
|
|
566 sprintf(insnbuf, "%s %s", opcode, t);
|
|
|
567 l -> disasm = lw_strdup(insnbuf);
|
|
|
568 }
|
