Mercurial > repos > blastem
annotate z80_to_x86.c @ 235:d9bf8e61c33c
Get Z80 core working for simple programs
author | Mike Pavone <pavone@retrodev.com> |
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date | Thu, 25 Apr 2013 21:01:11 -0700 |
parents | 4d4559b04c59 |
children | 19fb3523a9e5 |
rev | line source |
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1 #include "z80inst.h" |
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2 #include "z80_to_x86.h" |
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3 #include "gen_x86.h" |
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4 #include "mem.h" |
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5 #include <stdio.h> |
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6 #include <stdlib.h> |
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7 #include <stddef.h> |
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8 #include <string.h> |
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9 |
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10 #define MODE_UNUSED (MODE_IMMED-1) |
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11 |
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12 #define ZCYCLES RBP |
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13 #define SCRATCH1 R13 |
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14 #define SCRATCH2 R14 |
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15 #define CONTEXT RSI |
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16 |
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17 //TODO: Find out the actual value for this |
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18 #define MAX_NATIVE_SIZE 128 |
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19 |
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20 void z80_read_byte(); |
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21 void z80_read_word(); |
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22 void z80_write_byte(); |
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23 void z80_write_word_highfirst(); |
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24 void z80_write_word_lowfirst(); |
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25 void z80_save_context(); |
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26 void z80_native_addr(); |
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27 |
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28 uint8_t z80_size(z80inst * inst) |
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29 { |
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30 uint8_t reg = (inst->reg & 0x1F); |
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31 if (reg != Z80_UNUSED && reg != Z80_USE_IMMED) { |
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32 return reg < Z80_BC ? SZ_B : SZ_W; |
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33 } |
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34 //TODO: Handle any necessary special cases |
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35 return SZ_B; |
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36 } |
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37 |
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38 uint8_t * zcycles(uint8_t * dst, uint32_t num_cycles) |
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39 { |
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40 return add_ir(dst, num_cycles, ZCYCLES, SZ_D); |
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41 } |
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42 |
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43 uint8_t * translate_z80_reg(z80inst * inst, x86_ea * ea, uint8_t * dst, x86_z80_options * opts) |
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44 { |
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45 if (inst->reg == Z80_USE_IMMED) { |
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46 ea->mode = MODE_IMMED; |
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47 ea->disp = inst->immed; |
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48 } else if ((inst->reg & 0x1F) == Z80_UNUSED) { |
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49 ea->mode = MODE_UNUSED; |
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50 } else { |
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51 ea->mode = MODE_REG_DIRECT; |
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52 if (inst->reg == Z80_IYH) { |
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53 ea->base = opts->regs[Z80_IYL]; |
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54 dst = ror_ir(dst, 8, opts->regs[Z80_IY], SZ_W); |
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55 } else { |
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56 ea->base = opts->regs[inst->reg]; |
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57 } |
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58 } |
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59 return dst; |
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60 } |
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61 |
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62 uint8_t * z80_save_reg(uint8_t * dst, z80inst * inst, x86_z80_options * opts) |
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63 { |
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64 if (inst->reg == Z80_IYH) { |
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65 dst = ror_ir(dst, 8, opts->regs[Z80_IY], SZ_W); |
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66 } |
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67 return dst; |
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68 } |
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69 |
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70 uint8_t * translate_z80_ea(z80inst * inst, x86_ea * ea, uint8_t * dst, x86_z80_options * opts, uint8_t read, uint8_t modify) |
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71 { |
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72 uint8_t size, reg, areg; |
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73 ea->mode = MODE_REG_DIRECT; |
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74 areg = read ? SCRATCH1 : SCRATCH2; |
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75 switch(inst->addr_mode & 0x1F) |
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76 { |
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77 case Z80_REG: |
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78 if (inst->ea_reg == Z80_IYH) { |
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79 ea->base = opts->regs[Z80_IYL]; |
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80 dst = ror_ir(dst, 8, opts->regs[Z80_IY], SZ_W); |
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81 } else { |
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82 ea->base = opts->regs[inst->ea_reg]; |
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83 } |
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84 break; |
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85 case Z80_REG_INDIRECT: |
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86 dst = mov_rr(dst, opts->regs[inst->ea_reg], areg, SZ_W); |
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87 size = z80_size(inst); |
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88 if (read) { |
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89 if (modify) { |
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90 dst = push_r(dst, SCRATCH1); |
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91 } |
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92 if (size == SZ_B) { |
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93 dst = call(dst, (uint8_t *)z80_read_byte); |
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94 } else { |
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95 dst = call(dst, (uint8_t *)z80_read_word); |
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96 } |
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97 if (modify) { |
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98 dst = pop_r(dst, SCRATCH2); |
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99 } |
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100 } |
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101 ea->base = SCRATCH1; |
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102 break; |
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103 case Z80_IMMED: |
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104 ea->mode = MODE_IMMED; |
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105 ea->disp = inst->immed; |
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106 break; |
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107 case Z80_IMMED_INDIRECT: |
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108 dst = mov_ir(dst, inst->immed, areg, SZ_W); |
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109 size = z80_size(inst); |
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110 if (read) { |
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111 if (modify) { |
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112 dst = push_r(dst, SCRATCH1); |
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113 } |
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114 if (size == SZ_B) { |
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115 dst = call(dst, (uint8_t *)z80_read_byte); |
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116 } else { |
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117 dst = call(dst, (uint8_t *)z80_read_word); |
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118 } |
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119 if (modify) { |
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120 dst = pop_r(dst, SCRATCH2); |
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121 } |
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122 } |
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123 ea->base = SCRATCH1; |
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124 break; |
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125 case Z80_IX_DISPLACE: |
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126 case Z80_IY_DISPLACE: |
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127 reg = opts->regs[inst->addr_mode == Z80_IX_DISPLACE ? Z80_IX : Z80_IY]; |
213
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128 dst = mov_rr(dst, reg, areg, SZ_W); |
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129 dst = add_ir(dst, inst->immed, areg, SZ_W); |
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130 size = z80_size(inst); |
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131 if (read) { |
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132 if (modify) { |
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133 dst = push_r(dst, SCRATCH1); |
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134 } |
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135 if (size == SZ_B) { |
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136 dst = call(dst, (uint8_t *)z80_read_byte); |
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137 } else { |
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138 dst = call(dst, (uint8_t *)z80_read_word); |
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139 } |
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140 if (modify) { |
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141 dst = pop_r(dst, SCRATCH2); |
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142 } |
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143 } |
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144 break; |
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145 case Z80_UNUSED: |
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146 ea->mode = MODE_UNUSED; |
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147 break; |
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148 default: |
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149 fprintf(stderr, "Unrecognized Z80 addressing mode %d\n", inst->addr_mode); |
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150 exit(1); |
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151 } |
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152 return dst; |
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153 } |
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154 |
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155 uint8_t * z80_save_ea(uint8_t * dst, z80inst * inst, x86_z80_options * opts) |
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156 { |
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157 if (inst->addr_mode == Z80_REG && inst->ea_reg == Z80_IYH) { |
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158 dst = ror_ir(dst, 8, opts->regs[Z80_IY], SZ_W); |
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159 } |
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160 return dst; |
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161 } |
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162 |
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163 uint8_t * z80_save_result(uint8_t * dst, z80inst * inst) |
213
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164 { |
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165 if (z80_size(inst) == SZ_B) { |
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166 dst = call(dst, (uint8_t *)z80_write_byte); |
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167 } else { |
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168 dst = call(dst, (uint8_t *)z80_write_word_lowfirst); |
213
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169 } |
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170 return dst; |
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171 } |
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172 |
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173 enum { |
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174 DONT_READ=0, |
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175 READ |
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176 }; |
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177 |
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178 enum { |
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179 DONT_MODIFY=0, |
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180 MODIFY |
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181 }; |
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182 |
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183 uint8_t zf_off(uint8_t flag) |
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184 { |
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185 return offsetof(z80_context, flags) + flag; |
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186 } |
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187 |
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188 void z80_print_regs_exit(z80_context * context) |
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189 { |
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190 printf("A: %X\nB: %X\nC: %X\nD: %X\nE: %X\nHL: %X\nIX: %X\nIY: %X\nSP: %X\n", |
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191 context->regs[Z80_A], context->regs[Z80_B], context->regs[Z80_C], |
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192 context->regs[Z80_D], context->regs[Z80_E], |
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193 (context->regs[Z80_H] << 8) | context->regs[Z80_L], |
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194 (context->regs[Z80_IXH] << 8) | context->regs[Z80_IXL], |
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195 (context->regs[Z80_IYH] << 8) | context->regs[Z80_IYL], |
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196 context->sp); |
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197 exit(0); |
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198 } |
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199 |
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200 uint8_t * translate_z80inst(z80inst * inst, uint8_t * dst, z80_context * context, uint16_t address) |
213
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201 { |
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202 uint32_t cycles; |
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203 x86_ea src_op, dst_op; |
235
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204 uint8_t size; |
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205 x86_z80_options *opts = context->options; |
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206 switch(inst->op) |
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207 { |
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208 case Z80_LD: |
235
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209 size = z80_size(inst); |
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210 switch (inst->addr_mode & 0x1F) |
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211 { |
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212 case Z80_REG: |
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213 case Z80_REG_INDIRECT: |
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214 cycles = size == SZ_B ? 4 : 6; |
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215 if (inst->ea_reg == Z80_IX || inst->ea_reg == Z80_IY) { |
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216 cycles += 4; |
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217 } |
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218 break; |
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219 case Z80_IMMED: |
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220 cycles = size == SZ_B ? 7 : 10; |
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221 break; |
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222 case Z80_IMMED_INDIRECT: |
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223 cycles = 10; |
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224 break; |
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225 case Z80_IX_DISPLACE: |
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226 case Z80_IY_DISPLACE: |
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227 cycles = 12; |
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228 break; |
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229 } |
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230 if ((inst->reg >= Z80_IXL && inst->reg <= Z80_IYH) || inst->reg == Z80_IX || inst->reg == Z80_IY) { |
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231 cycles += 4; |
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232 } |
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233 dst = zcycles(dst, cycles); |
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234 if (inst->addr_mode & Z80_DIR) { |
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235 dst = translate_z80_reg(inst, &src_op, dst, opts); |
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236 dst = translate_z80_ea(inst, &dst_op, dst, opts, DONT_READ, MODIFY); |
235
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237 } else { |
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238 dst = translate_z80_ea(inst, &src_op, dst, opts, READ, DONT_MODIFY); |
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239 dst = translate_z80_reg(inst, &dst_op, dst, opts); |
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240 } |
235
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241 if (src_op.mode == MODE_REG_DIRECT) { |
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242 dst = mov_rr(dst, src_op.base, dst_op.base, size); |
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243 } else { |
235
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244 dst = mov_ir(dst, src_op.disp, dst_op.base, size); |
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245 } |
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246 dst = z80_save_reg(dst, inst, opts); |
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247 dst = z80_save_ea(dst, inst, opts); |
235
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248 if (inst->addr_mode & Z80_DIR) { |
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249 dst = z80_save_result(dst, inst); |
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250 } |
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251 break; |
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252 case Z80_PUSH: |
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253 dst = zcycles(dst, (inst->reg == Z80_IX || inst->reg == Z80_IY) ? 9 : 5); |
235
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254 dst = sub_ir(dst, 2, opts->regs[Z80_SP], SZ_W); |
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255 if (inst->reg == Z80_AF) { |
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256 dst = mov_rdisp8r(dst, CONTEXT, zf_off(ZF_S), SCRATCH2, SZ_B); |
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257 dst = shl_ir(dst, 1, SCRATCH2, SZ_B); |
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258 dst = or_rdisp8r(dst, CONTEXT, zf_off(ZF_Z), SCRATCH2, SZ_B); |
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259 dst = shl_ir(dst, 2, SCRATCH2, SZ_B); |
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260 dst = or_rdisp8r(dst, CONTEXT, zf_off(ZF_H), SCRATCH2, SZ_B); |
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261 dst = shl_ir(dst, 2, SCRATCH2, SZ_B); |
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262 dst = or_rdisp8r(dst, CONTEXT, zf_off(ZF_PV), SCRATCH2, SZ_B); |
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263 dst = shl_ir(dst, 1, SCRATCH2, SZ_B); |
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264 dst = or_rdisp8r(dst, CONTEXT, zf_off(ZF_N), SCRATCH2, SZ_B); |
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265 dst = shl_ir(dst, 1, SCRATCH2, SZ_B); |
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266 dst = or_rdisp8r(dst, CONTEXT, zf_off(ZF_C), SCRATCH2, SZ_B); |
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267 dst = shl_ir(dst, 8, SCRATCH2, SZ_W); |
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268 dst = mov_rr(dst, opts->regs[Z80_A], SCRATCH2, SZ_B); |
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269 } else { |
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270 dst = translate_z80_reg(inst, &src_op, dst, opts); |
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271 dst = mov_rr(dst, src_op.base, SCRATCH2, SZ_W); |
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272 } |
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273 dst = mov_rr(dst, opts->regs[Z80_SP], SCRATCH1, SZ_W); |
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274 dst = call(dst, (uint8_t *)z80_write_word_highfirst); |
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275 //no call to save_z80_reg needed since there's no chance we'll use the only |
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276 //the upper half of a register pair |
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277 break; |
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278 case Z80_POP: |
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279 dst = zcycles(dst, (inst->reg == Z80_IX || inst->reg == Z80_IY) ? 8 : 4); |
235
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280 dst = mov_rr(dst, opts->regs[Z80_SP], SCRATCH1, SZ_W); |
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281 dst = call(dst, (uint8_t *)z80_read_word); |
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282 dst = add_ir(dst, 2, opts->regs[Z80_SP], SZ_W); |
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283 if (inst->reg == Z80_AF) { |
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284 dst = mov_rr(dst, SCRATCH1, opts->regs[Z80_A], SZ_B); |
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285 dst = bt_ir(dst, 8, SCRATCH1, SZ_W); |
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286 dst = setcc_rdisp8(dst, CC_C, CONTEXT, zf_off(ZF_C)); |
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287 dst = bt_ir(dst, 9, SCRATCH1, SZ_W); |
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288 dst = setcc_rdisp8(dst, CC_C, CONTEXT, zf_off(ZF_N)); |
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289 dst = bt_ir(dst, 10, SCRATCH1, SZ_W); |
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290 dst = setcc_rdisp8(dst, CC_C, CONTEXT, zf_off(ZF_PV)); |
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291 dst = bt_ir(dst, 12, SCRATCH1, SZ_W); |
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292 dst = setcc_rdisp8(dst, CC_C, CONTEXT, zf_off(ZF_H)); |
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293 dst = bt_ir(dst, 14, SCRATCH1, SZ_W); |
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294 dst = setcc_rdisp8(dst, CC_C, CONTEXT, zf_off(ZF_Z)); |
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295 dst = bt_ir(dst, 15, SCRATCH1, SZ_W); |
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296 dst = setcc_rdisp8(dst, CC_C, CONTEXT, zf_off(ZF_S)); |
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297 } else { |
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298 dst = translate_z80_reg(inst, &src_op, dst, opts); |
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299 dst = mov_rr(dst, SCRATCH1, src_op.base, SZ_W); |
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300 } |
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301 //no call to save_z80_reg needed since there's no chance we'll use the only |
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302 //the upper half of a register pair |
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303 break; |
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304 /*case Z80_EX: |
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305 case Z80_EXX: |
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306 case Z80_LDI: |
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307 case Z80_LDIR: |
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308 case Z80_LDD: |
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309 case Z80_LDDR: |
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310 case Z80_CPI: |
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311 case Z80_CPIR: |
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312 case Z80_CPD: |
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313 case Z80_CPDR: |
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314 break;*/ |
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315 case Z80_ADD: |
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316 cycles = 4; |
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317 if (inst->addr_mode == Z80_IX_DISPLACE || inst->addr_mode == Z80_IY_DISPLACE) { |
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318 cycles += 12; |
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319 } else if(inst->addr_mode == Z80_IMMED) { |
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320 cycles += 3; |
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321 } else if(z80_size(inst) == SZ_W) { |
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322 cycles += 4; |
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323 } |
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324 dst = zcycles(dst, cycles); |
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325 dst = translate_z80_reg(inst, &dst_op, dst, opts); |
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326 dst = translate_z80_ea(inst, &src_op, dst, opts, READ, DONT_MODIFY); |
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327 if (src_op.mode == MODE_REG_DIRECT) { |
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328 dst = add_rr(dst, src_op.base, dst_op.base, z80_size(inst)); |
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329 } else { |
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330 dst = add_ir(dst, src_op.disp, dst_op.base, z80_size(inst)); |
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331 } |
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332 dst = setcc_rdisp8(dst, CC_C, CONTEXT, zf_off(ZF_C)); |
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333 dst = mov_irdisp8(dst, 0, CONTEXT, zf_off(ZF_N), SZ_B); |
213
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334 //TODO: Implement half-carry flag |
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335 if (z80_size(inst) == SZ_B) { |
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336 dst = setcc_rdisp8(dst, CC_O, CONTEXT, zf_off(ZF_PV)); |
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337 dst = setcc_rdisp8(dst, CC_Z, CONTEXT, zf_off(ZF_Z)); |
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338 dst = setcc_rdisp8(dst, CC_S, CONTEXT, zf_off(ZF_S)); |
213
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339 } |
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340 dst = z80_save_reg(dst, inst, opts); |
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341 dst = z80_save_ea(dst, inst, opts); |
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342 break; |
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343 /*case Z80_ADC: |
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344 break;*/ |
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345 case Z80_SUB: |
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346 cycles = 4; |
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347 if (inst->addr_mode == Z80_IX_DISPLACE || inst->addr_mode == Z80_IY_DISPLACE) { |
213
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348 cycles += 12; |
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349 } else if(inst->addr_mode == Z80_IMMED) { |
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350 cycles += 3; |
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351 } |
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352 dst = zcycles(dst, cycles); |
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353 dst = translate_z80_reg(inst, &dst_op, dst, opts); |
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354 dst = translate_z80_ea(inst, &src_op, dst, opts, READ, DONT_MODIFY); |
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355 if (src_op.mode == MODE_REG_DIRECT) { |
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356 dst = sub_rr(dst, src_op.base, dst_op.base, z80_size(inst)); |
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357 } else { |
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358 dst = sub_ir(dst, src_op.disp, dst_op.base, z80_size(inst)); |
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359 } |
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360 dst = setcc_rdisp8(dst, CC_C, CONTEXT, zf_off(ZF_C)); |
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361 dst = mov_irdisp8(dst, 1, CONTEXT, zf_off(ZF_N), SZ_B); |
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362 dst = setcc_rdisp8(dst, CC_O, CONTEXT, zf_off(ZF_PV)); |
213
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363 //TODO: Implement half-carry flag |
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364 dst = setcc_rdisp8(dst, CC_Z, CONTEXT, zf_off(ZF_Z)); |
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365 dst = setcc_rdisp8(dst, CC_S, CONTEXT, zf_off(ZF_S)); |
213
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366 dst = z80_save_reg(dst, inst, opts); |
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367 dst = z80_save_ea(dst, inst, opts); |
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368 break; |
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369 /*case Z80_SBC: |
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370 case Z80_AND: |
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371 case Z80_OR: |
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372 case Z80_XOR: |
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373 case Z80_CP:*/ |
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374 case Z80_INC: |
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375 cycles = 4; |
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376 if (inst->reg == Z80_IX || inst->reg == Z80_IY) { |
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377 cycles += 6; |
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378 } else if(z80_size(inst) == SZ_W) { |
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379 cycles += 2; |
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380 } else if(inst->reg == Z80_IXH || inst->reg == Z80_IXL || inst->reg == Z80_IYH || inst->reg == Z80_IYL || inst->addr_mode == Z80_IX_DISPLACE || inst->addr_mode == Z80_IY_DISPLACE) { |
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381 cycles += 4; |
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382 } |
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383 dst = translate_z80_reg(inst, &dst_op, dst, opts); |
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384 if (dst_op.mode == MODE_UNUSED) { |
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385 dst = translate_z80_ea(inst, &dst_op, dst, opts, READ, MODIFY); |
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386 } |
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387 dst = add_ir(dst, 1, dst_op.base, z80_size(inst)); |
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388 if (z80_size(inst) == SZ_B) { |
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389 dst = mov_irdisp8(dst, 0, CONTEXT, zf_off(ZF_N), SZ_B); |
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390 //TODO: Implement half-carry flag |
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391 dst = setcc_rdisp8(dst, CC_O, CONTEXT, zf_off(ZF_PV)); |
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392 dst = setcc_rdisp8(dst, CC_Z, CONTEXT, zf_off(ZF_Z)); |
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393 dst = setcc_rdisp8(dst, CC_S, CONTEXT, zf_off(ZF_S)); |
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394 } |
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395 dst = z80_save_reg(dst, inst, opts); |
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396 dst = z80_save_ea(dst, inst, opts); |
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397 break; |
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398 /*case Z80_DEC: |
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399 break; |
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400 case Z80_DAA: |
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401 case Z80_CPL: |
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402 case Z80_NEG: |
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403 case Z80_CCF: |
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404 case Z80_SCF:*/ |
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405 case Z80_NOP: |
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406 if (inst->immed == 42) { |
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407 dst = call(dst, (uint8_t *)z80_save_context); |
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408 dst = mov_rr(dst, CONTEXT, RDI, SZ_Q); |
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409 dst = jmp(dst, (uint8_t *)z80_print_regs_exit); |
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410 } else { |
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411 dst = zcycles(dst, 4 * inst->immed); |
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412 } |
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413 break; |
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414 /*case Z80_HALT: |
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415 case Z80_DI: |
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416 case Z80_EI: |
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417 case Z80_IM: |
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418 case Z80_RLC: |
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419 case Z80_RL: |
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420 case Z80_RRC: |
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421 case Z80_RR: |
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422 case Z80_SLA: |
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423 case Z80_SRA: |
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424 case Z80_SLL: |
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425 case Z80_SRL: |
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426 case Z80_RLD: |
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427 case Z80_RRD: |
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428 case Z80_BIT: |
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429 case Z80_SET: |
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430 case Z80_RES: |
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431 case Z80_JP: |
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432 case Z80_JPCC: |
235
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433 case Z80_JR:*/ |
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434 case Z80_JRCC: { |
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435 dst = zcycles(dst, 7);//T States: 4,3 |
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436 uint8_t cond = CC_Z; |
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437 switch (inst->reg) |
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438 { |
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439 case Z80_CC_NZ: |
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440 cond = CC_NZ; |
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441 case Z80_CC_Z: |
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442 dst = cmp_irdisp8(dst, 0, CONTEXT, zf_off(ZF_Z), SZ_B); |
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443 break; |
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444 case Z80_CC_NC: |
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445 cond = CC_NZ; |
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446 case Z80_CC_C: |
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447 dst = cmp_irdisp8(dst, 0, CONTEXT, zf_off(ZF_C), SZ_B); |
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448 break; |
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449 } |
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450 uint8_t *no_jump_off = dst+1; |
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451 dst = jcc(dst, cond, dst+2); |
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452 dst = zcycles(dst, 5);//T States: 5 |
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453 uint16_t dest_addr = address + inst->immed + 2; |
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454 if (dest_addr < 0x4000) { |
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455 uint8_t * call_dst = z80_get_native_address(context, dest_addr); |
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456 if (!call_dst) { |
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457 opts->deferred = defer_address(opts->deferred, dest_addr, dst + 1); |
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458 //fake address to force large displacement |
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459 call_dst = dst + 256; |
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460 } |
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461 dst = jmp(dst, call_dst); |
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462 } else { |
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463 dst = mov_ir(dst, dest_addr, SCRATCH1, SZ_W); |
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464 dst = call(dst, (uint8_t *)z80_native_addr); |
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465 dst = jmp_r(dst, SCRATCH1); |
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466 } |
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467 *no_jump_off = dst - (no_jump_off+1); |
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468 break; |
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469 } |
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470 //case Z80_DJNZ:*/ |
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471 case Z80_CALL: { |
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472 dst = zcycles(dst, 11);//T States: 4,3,4 |
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473 dst = sub_ir(dst, 2, opts->regs[Z80_SP], SZ_W); |
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474 dst = mov_ir(dst, address + 3, SCRATCH2, SZ_W); |
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475 dst = mov_rr(dst, opts->regs[Z80_SP], SCRATCH1, SZ_W); |
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476 dst = call(dst, (uint8_t *)z80_write_word_highfirst);//T States: 3, 3 |
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477 if (inst->immed < 0x4000) { |
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478 uint8_t * call_dst = z80_get_native_address(context, inst->immed); |
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479 if (!call_dst) { |
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480 opts->deferred = defer_address(opts->deferred, inst->immed, dst + 1); |
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481 //fake address to force large displacement |
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482 call_dst = dst + 256; |
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483 } |
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484 dst = jmp(dst, call_dst); |
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485 } else { |
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486 dst = mov_ir(dst, inst->immed, SCRATCH1, SZ_W); |
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487 dst = call(dst, (uint8_t *)z80_native_addr); |
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488 dst = jmp_r(dst, SCRATCH1); |
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489 } |
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490 break; |
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491 } |
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492 //case Z80_CALLCC: |
213
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493 case Z80_RET: |
235
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494 dst = zcycles(dst, 4);//T States: 4 |
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495 dst = mov_rr(dst, opts->regs[Z80_SP], SCRATCH1, SZ_W); |
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496 dst = call(dst, (uint8_t *)z80_read_word);//T STates: 3, 3 |
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497 dst = add_ir(dst, 2, opts->regs[Z80_SP], SZ_W); |
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498 dst = call(dst, (uint8_t *)z80_native_addr); |
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499 dst = jmp_r(dst, SCRATCH1); |
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500 break; |
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501 /*case Z80_RETCC: |
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502 case Z80_RETI: |
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503 case Z80_RETN: |
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504 case Z80_RST: |
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505 case Z80_IN: |
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506 case Z80_INI: |
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507 case Z80_INIR: |
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508 case Z80_IND: |
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509 case Z80_INDR: |
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510 case Z80_OUT: |
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511 case Z80_OUTI: |
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512 case Z80_OTIR: |
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513 case Z80_OUTD: |
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514 case Z80_OTDR:*/ |
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515 default: { |
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516 char disbuf[80]; |
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517 z80_disasm(inst, disbuf); |
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518 fprintf(stderr, "unimplemented instruction: %s\n", disbuf); |
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519 exit(1); |
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520 } |
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521 } |
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522 return dst; |
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523 } |
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524 |
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525 uint8_t * z80_get_native_address(z80_context * context, uint32_t address) |
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526 { |
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527 native_map_slot *map; |
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528 if (address < 0x4000) { |
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529 address &= 0x1FFF; |
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530 map = context->static_code_map; |
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531 } else if (address >= 0x8000) { |
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532 address &= 0x7FFF; |
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533 map = context->banked_code_map + context->bank_reg; |
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534 } else { |
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535 return NULL; |
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536 } |
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537 if (!map->base || !map->offsets || map->offsets[address] == INVALID_OFFSET) { |
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538 return NULL; |
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539 } |
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540 return map->base + map->offsets[address]; |
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541 } |
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542 |
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543 //TODO: Record z80 instruction size and code size for addresses to support modification of translated code |
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544 void z80_map_native_address(z80_context * context, uint32_t address, uint8_t * native_address) |
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545 { |
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546 native_map_slot *map; |
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547 if (address < 0x4000) { |
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548 address &= 0x1FFF; |
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549 map = context->static_code_map; |
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550 } else if (address >= 0x8000) { |
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551 address &= 0x7FFF; |
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552 map = context->banked_code_map + context->bank_reg; |
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553 if (!map->offsets) { |
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554 map->offsets = malloc(sizeof(int32_t) * 0x8000); |
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555 memset(map->offsets, 0xFF, sizeof(int32_t) * 0x8000); |
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556 } |
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557 } else { |
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558 return; |
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559 } |
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560 if (!map->base) { |
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561 map->base = native_address; |
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562 } |
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563 map->offsets[address] = native_address - map->base; |
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564 } |
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565 |
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566 uint8_t * z80_get_native_address_trans(z80_context * context, uint32_t address) |
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567 { |
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568 uint8_t * addr = z80_get_native_address(context, address); |
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569 if (!addr) { |
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570 translate_z80_stream(context, address); |
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571 addr = z80_get_native_address(context, address); |
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572 } |
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573 return addr; |
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574 } |
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575 |
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576 void translate_z80_stream(z80_context * context, uint32_t address) |
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577 { |
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578 char disbuf[80]; |
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579 if (z80_get_native_address(context, address)) { |
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580 return; |
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581 } |
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582 x86_z80_options * opts = context->options; |
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583 uint8_t * encoded = NULL, *next; |
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584 if (address < 0x4000) { |
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585 encoded = context->mem_pointers[0] + (address & 0x1FFF); |
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586 } else if(address >= 0x8000 && context->mem_pointers[1]) { |
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587 encoded = context->mem_pointers[1] + (address & 0x7FFF); |
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588 } |
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589 while (encoded != NULL) |
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590 { |
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591 z80inst inst; |
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592 printf("translating Z80 code at address %X\n", address); |
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593 do { |
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594 if (opts->code_end-opts->cur_code < MAX_NATIVE_SIZE) { |
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595 if (opts->code_end-opts->cur_code < 5) { |
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596 puts("out of code memory, not enough space for jmp to next chunk"); |
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597 exit(1); |
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598 } |
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599 size_t size = 1024*1024; |
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600 opts->cur_code = alloc_code(&size); |
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601 opts->code_end = opts->cur_code + size; |
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602 jmp(opts->cur_code, opts->cur_code); |
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603 } |
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604 if (address > 0x4000 & address < 0x8000) { |
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605 opts->cur_code = xor_rr(opts->cur_code, RDI, RDI, SZ_D); |
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606 opts->cur_code = call(opts->cur_code, (uint8_t *)exit); |
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607 break; |
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608 } |
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609 uint8_t * existing = z80_get_native_address(context, address); |
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610 if (existing) { |
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611 opts->cur_code = jmp(opts->cur_code, existing); |
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612 break; |
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613 } |
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614 next = z80_decode(encoded, &inst); |
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615 z80_disasm(&inst, disbuf); |
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616 if (inst.op == Z80_NOP) { |
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617 printf("%X\t%s(%d)\n", address, disbuf, inst.immed); |
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618 } else { |
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619 printf("%X\t%s\n", address, disbuf); |
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620 } |
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621 z80_map_native_address(context, address, opts->cur_code); |
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622 opts->cur_code = translate_z80inst(&inst, opts->cur_code, context, address); |
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623 address += next-encoded; |
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624 encoded = next; |
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625 } while (!(inst.op == Z80_RET || inst.op == Z80_RETI || inst.op == Z80_RETN || (inst.op = Z80_NOP && inst.immed == 42))); |
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626 process_deferred(&opts->deferred, context, (native_addr_func)z80_get_native_address); |
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627 if (opts->deferred) { |
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628 address = opts->deferred->address; |
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629 printf("defferred address: %X\n", address); |
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630 if (address < 0x4000) { |
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631 encoded = context->mem_pointers[0] + (address & 0x1FFF); |
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632 } else if (address > 0x8000 && context->mem_pointers[1]) { |
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633 encoded = context->mem_pointers[1] + (address & 0x7FFF); |
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634 } else { |
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635 printf("attempt to translate non-memory address: %X\n", address); |
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636 exit(1); |
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637 } |
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638 } else { |
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639 encoded = NULL; |
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640 } |
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641 } |
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642 } |
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643 |
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644 void init_x86_z80_opts(x86_z80_options * options) |
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645 { |
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646 options->flags = 0; |
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647 options->regs[Z80_B] = BH; |
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648 options->regs[Z80_C] = RBX; |
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649 options->regs[Z80_D] = CH; |
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650 options->regs[Z80_E] = RCX; |
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651 options->regs[Z80_H] = AH; |
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652 options->regs[Z80_L] = RAX; |
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653 options->regs[Z80_IXH] = DH; |
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654 options->regs[Z80_IXL] = RDX; |
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655 options->regs[Z80_IYH] = -1; |
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656 options->regs[Z80_IYL] = -1; |
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657 options->regs[Z80_I] = -1; |
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658 options->regs[Z80_R] = -1; |
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659 options->regs[Z80_A] = R10; |
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660 options->regs[Z80_BC] = RBX; |
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661 options->regs[Z80_DE] = RCX; |
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662 options->regs[Z80_HL] = RAX; |
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663 options->regs[Z80_SP] = R9; |
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664 options->regs[Z80_AF] = -1; |
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665 options->regs[Z80_IX] = RDX; |
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666 options->regs[Z80_IY] = R8; |
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667 size_t size = 1024 * 1024; |
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668 options->cur_code = alloc_code(&size); |
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669 options->code_end = options->cur_code + size; |
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670 options->deferred = NULL; |
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671 } |
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672 |
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673 void init_z80_context(z80_context * context, x86_z80_options * options) |
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674 { |
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675 memset(context, 0, sizeof(*context)); |
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676 context->static_code_map = malloc(sizeof(context->static_code_map)); |
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677 context->static_code_map->offsets = malloc(sizeof(int32_t) * 0x2000); |
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678 memset(context->static_code_map->offsets, 0xFF, sizeof(int32_t) * 0x2000); |
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679 context->banked_code_map = malloc(sizeof(native_map_slot) * (1 << 9)); |
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680 context->options = options; |
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681 } |
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682 |
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683 void z80_reset(z80_context * context) |
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684 { |
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685 context->native_pc = z80_get_native_address_trans(context, 0); |
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686 } |
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687 |
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688 |