Mercurial > repos > blastem
annotate blastem.c @ 184:ebcbdd1c4cc8
Fix a bunch of bugs in the CPU core, add a 68K debugger
author | Mike Pavone <pavone@retrodev.com> |
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date | Sun, 13 Jan 2013 13:01:13 -0800 |
parents | 97aa449706c2 |
children | b204fbed4efe |
rev | line source |
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1 #include "68kinst.h" |
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2 #include "m68k_to_x86.h" |
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3 #include "mem.h" |
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4 #include "vdp.h" |
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5 #include "render.h" |
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6 #include "blastem.h" |
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7 #include <stdio.h> |
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8 #include <stdlib.h> |
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9 #include <string.h> |
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10 |
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11 #define CARTRIDGE_WORDS 0x200000 |
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12 #define RAM_WORDS 32 * 1024 |
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13 #define Z80_RAM_BYTES 8 * 1024 |
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14 #define MCLKS_PER_68K 7 |
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15 //TODO: Figure out the exact value for this |
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16 #define MCLKS_PER_FRAME (MCLKS_LINE*262) |
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17 #define CYCLE_NEVER 0xFFFFFFFF |
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18 |
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19 uint16_t cart[CARTRIDGE_WORDS]; |
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20 uint16_t ram[RAM_WORDS]; |
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21 uint8_t z80_ram[Z80_RAM_BYTES]; |
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22 |
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23 io_port gamepad_1; |
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24 io_port gamepad_2; |
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25 |
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26 #ifndef MIN |
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27 #define MIN(a,b) ((a) < (b) ? (a) : (b)) |
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28 #endif |
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29 |
166 | 30 #define SMD_HEADER_SIZE 512 |
31 #define SMD_MAGIC1 0x03 | |
32 #define SMD_MAGIC2 0xAA | |
33 #define SMD_MAGIC3 0xBB | |
34 #define SMD_BLOCK_SIZE 0x4000 | |
35 | |
36 int load_smd_rom(long filesize, FILE * f) | |
37 { | |
38 uint8_t block[SMD_BLOCK_SIZE]; | |
39 filesize -= SMD_HEADER_SIZE; | |
40 fseek(f, SMD_HEADER_SIZE, SEEK_SET); | |
41 | |
42 uint16_t * dst = cart; | |
43 while (filesize > 0) { | |
44 fread(block, 1, SMD_BLOCK_SIZE, f); | |
45 for (uint8_t *low = block, *high = (block+SMD_BLOCK_SIZE/2), *end = block+SMD_BLOCK_SIZE; high < end; high++, low++) { | |
46 *(dst++) = *high << 8 | *low; | |
47 } | |
48 filesize -= SMD_BLOCK_SIZE; | |
49 } | |
50 return 1; | |
51 } | |
52 | |
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53 int load_rom(char * filename) |
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54 { |
166 | 55 uint8_t header[10]; |
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56 FILE * f = fopen(filename, "rb"); |
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57 if (!f) { |
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58 return 0; |
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59 } |
166 | 60 fread(header, 1, sizeof(header), f); |
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61 fseek(f, 0, SEEK_END); |
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62 long filesize = ftell(f); |
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63 if (filesize/2 > CARTRIDGE_WORDS) { |
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64 //carts bigger than 4MB not currently supported |
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65 filesize = CARTRIDGE_WORDS*2; |
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66 } |
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67 fseek(f, 0, SEEK_SET); |
166 | 68 if (header[1] == SMD_MAGIC1 && header[8] == SMD_MAGIC2 && header[9] == SMD_MAGIC3) { |
69 int i; | |
70 for (i = 3; i < 8; i++) { | |
71 if (header[i] != 0) { | |
72 break; | |
73 } | |
74 } | |
75 if (i == 8) { | |
76 if (header[2]) { | |
77 fprintf(stderr, "%s is a split SMD ROM which is not currently supported", filename); | |
78 exit(1); | |
79 } | |
80 return load_smd_rom(filesize, f); | |
81 } | |
82 } | |
83 fread(cart, 2, filesize/2, f); | |
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84 fclose(f); |
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85 for(unsigned short * cur = cart; cur - cart < (filesize/2); ++cur) |
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86 { |
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87 *cur = (*cur >> 8) | (*cur << 8); |
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88 } |
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89 //TODO: Mirror ROM |
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90 return 1; |
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91 } |
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92 |
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93 uint16_t read_dma_value(uint32_t address) |
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94 { |
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95 //addresses here are word addresses (i.e. bit 0 corresponds to A1), so no need to do div by 2 |
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96 if (address < 0x200000) { |
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97 return cart[address]; |
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98 } else if(address >= 0x700000) { |
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99 return ram[address & 0x7FFF]; |
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100 } |
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101 //TODO: Figure out what happens when you try to DMA from weird adresses like IO or banked Z80 area |
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102 return 0; |
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103 } |
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104 |
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105 #define VINT_CYCLE ((MCLKS_LINE * 226)/MCLKS_PER_68K) |
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106 |
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107 m68k_context * sync_components(m68k_context * context) |
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108 { |
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109 //TODO: Handle sync targets smaller than a single frame |
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110 vdp_context * v_context = context->next_context; |
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111 uint32_t mclks = context->current_cycle * MCLKS_PER_68K; |
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112 if (mclks >= MCLKS_PER_FRAME) { |
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113 //printf("reached frame end | 68K Cycles: %d, MCLK Cycles: %d\n", context->current_cycle, mclks); |
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114 vdp_run_context(v_context, MCLKS_PER_FRAME); |
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115 wait_render_frame(v_context); |
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116 mclks -= MCLKS_PER_FRAME; |
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117 vdp_adjust_cycles(v_context, MCLKS_PER_FRAME); |
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118 io_adjust_cycles(&gamepad_1, context->current_cycle, MCLKS_PER_FRAME/MCLKS_PER_68K); |
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119 io_adjust_cycles(&gamepad_2, context->current_cycle, MCLKS_PER_FRAME/MCLKS_PER_68K); |
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120 context->current_cycle -= MCLKS_PER_FRAME/MCLKS_PER_68K; |
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121 if (mclks) { |
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122 vdp_run_context(v_context, mclks); |
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123 } |
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124 if (v_context->regs[REG_MODE_2] & 0x20 && ((context->status & 0x7) < 6)) { |
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125 if (context->int_cycle > VINT_CYCLE) { |
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126 context->int_cycle = VINT_CYCLE; |
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127 context->int_num = 6; |
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128 if (context->int_cycle < context->sync_cycle) { |
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129 context->target_cycle = context->int_cycle; |
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130 } |
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131 } |
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132 } else { |
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133 context->int_cycle = 0xFFFFFFFF; |
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134 context->target_cycle = context->sync_cycle; |
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135 } |
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136 } else { |
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137 //printf("running VDP for %d cycles\n", mclks - v_context->cycles); |
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138 vdp_run_context(v_context, mclks); |
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139 if (v_context->regs[REG_MODE_2] & 0x20 && ((context->status & 0x7) < 6)) { |
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140 if (context->int_cycle > VINT_CYCLE) { |
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141 context->int_cycle = VINT_CYCLE; |
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142 context->int_num = 6; |
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143 if (context->int_cycle < context->sync_cycle && context->int_cycle < context->current_cycle) { |
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144 context->target_cycle = context->int_cycle; |
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145 } |
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146 } |
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147 if (context->int_cycle <= context->current_cycle) { |
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148 context->int_cycle = CYCLE_NEVER; |
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149 context->target_cycle = context->sync_cycle; |
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150 } |
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151 } else { |
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152 context->int_cycle = CYCLE_NEVER; |
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153 context->target_cycle = context->sync_cycle; |
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154 } |
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155 } |
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156 return context; |
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157 } |
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158 |
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159 m68k_context * vdp_port_write(uint32_t vdp_port, m68k_context * context, uint16_t value) |
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160 { |
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161 //printf("vdp_port write: %X, value: %X, cycle: %d\n", vdp_port, value, context->current_cycle); |
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162 sync_components(context); |
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163 vdp_context * v_context = context->next_context; |
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164 if (vdp_port < 0x10) { |
149
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165 int blocked; |
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166 if (vdp_port < 4) { |
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167 while (vdp_data_port_write(v_context, value) < 0) { |
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168 while(v_context->flags & FLAG_DMA_RUN) { |
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169 vdp_run_dma_done(v_context, MCLKS_PER_FRAME); |
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170 if (v_context->cycles >= MCLKS_PER_FRAME) { |
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171 wait_render_frame(v_context); |
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172 vdp_adjust_cycles(v_context, MCLKS_PER_FRAME); |
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173 io_adjust_cycles(&gamepad_1, v_context->cycles/MCLKS_PER_68K, MCLKS_PER_FRAME/MCLKS_PER_68K); |
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174 io_adjust_cycles(&gamepad_2, v_context->cycles/MCLKS_PER_68K, MCLKS_PER_FRAME/MCLKS_PER_68K); |
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175 } |
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176 } |
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177 context->current_cycle = v_context->cycles / MCLKS_PER_68K; |
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178 } |
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179 } else if(vdp_port < 8) { |
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180 blocked = vdp_control_port_write(v_context, value); |
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181 if (blocked) { |
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182 while (blocked) { |
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183 while(v_context->flags & FLAG_DMA_RUN) { |
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184 vdp_run_dma_done(v_context, MCLKS_PER_FRAME); |
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185 if (v_context->cycles >= MCLKS_PER_FRAME) { |
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186 wait_render_frame(v_context); |
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187 vdp_adjust_cycles(v_context, MCLKS_PER_FRAME); |
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188 io_adjust_cycles(&gamepad_1, v_context->cycles/MCLKS_PER_68K, MCLKS_PER_FRAME/MCLKS_PER_68K); |
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189 io_adjust_cycles(&gamepad_2, v_context->cycles/MCLKS_PER_68K, MCLKS_PER_FRAME/MCLKS_PER_68K); |
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190 } |
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191 } |
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192 if (blocked < 0) { |
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193 blocked = vdp_control_port_write(v_context, value); |
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194 } else { |
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195 blocked = 0; |
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196 } |
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197 } |
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198 context->current_cycle = v_context->cycles / MCLKS_PER_68K; |
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199 } else { |
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200 if (v_context->regs[REG_MODE_2] & 0x20 && ((context->status & 0x7) < 6)) { |
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201 if (context->int_cycle > VINT_CYCLE) { |
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202 context->int_cycle = VINT_CYCLE; |
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203 context->int_num = 6; |
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204 if (context->int_cycle < context->sync_cycle) { |
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205 context->target_cycle = context->int_cycle; |
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206 } |
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207 } |
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208 } else { |
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209 context->int_cycle = 0xFFFFFFFF; |
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210 context->target_cycle = context->sync_cycle; |
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211 } |
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212 } |
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213 } else { |
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214 printf("Illegal write to HV Counter port %X\n", vdp_port); |
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215 exit(1); |
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216 } |
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217 context->current_cycle = v_context->cycles/MCLKS_PER_68K; |
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218 } else if (vdp_port < 0x18) { |
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219 //TODO: Implement PSG |
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220 } else { |
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221 //TODO: Implement undocumented test register(s) |
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222 } |
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223 return context; |
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224 } |
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225 |
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226 m68k_context * vdp_port_read(uint32_t vdp_port, m68k_context * context) |
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227 { |
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228 sync_components(context); |
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229 vdp_context * v_context = context->next_context; |
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230 if (vdp_port < 0x10) { |
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231 if (vdp_port < 4) { |
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232 context->value = vdp_data_port_read(v_context); |
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233 } else if(vdp_port < 8) { |
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234 context->value = vdp_control_port_read(v_context); |
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235 } else { |
137 | 236 context->value = vdp_hv_counter_read(v_context); |
237 //printf("HV Counter: %X at cycle %d\n", context->value, v_context->cycles); | |
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238 } |
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239 context->current_cycle = v_context->cycles/MCLKS_PER_68K; |
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240 } else { |
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241 printf("Illegal read from PSG or test register port %X\n", vdp_port); |
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242 exit(1); |
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243 } |
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244 return context; |
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245 } |
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246 |
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247 #define TH 0x40 |
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248 #define TH_TIMEOUT 8000 |
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249 #define Z80_ACK_DELAY 3 //TODO: Calculate this on the fly based on how synced up the Z80 and 68K clocks are |
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250 |
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251 uint8_t reset = 1; |
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252 uint8_t busreq = 0; |
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253 uint8_t busack = 0; |
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254 uint32_t busack_cycle = CYCLE_NEVER; |
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255 uint8_t new_busack = 0; |
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256 |
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257 void io_adjust_cycles(io_port * pad, uint32_t current_cycle, uint32_t deduction) |
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258 { |
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259 /*uint8_t control = pad->control | 0x80; |
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260 uint8_t th = control & pad->output; |
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261 if (pad->input[GAMEPAD_TH0] || pad->input[GAMEPAD_TH1]) { |
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262 printf("adjust_cycles | control: %X, TH: %X, GAMEPAD_TH0: %X, GAMEPAD_TH1: %X, TH Counter: %d, Timeout: %d, Cycle: %d\n", control, th, pad->input[GAMEPAD_TH0], pad->input[GAMEPAD_TH1], pad->th_counter,pad->timeout_cycle, current_cycle); |
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263 }*/ |
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264 if (current_cycle >= pad->timeout_cycle) { |
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265 pad->th_counter = 0; |
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266 } else { |
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267 pad->timeout_cycle -= deduction; |
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268 } |
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269 if (busack_cycle < CYCLE_NEVER && current_cycle < busack_cycle) { |
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270 busack_cycle -= deduction; |
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271 } |
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272 } |
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273 |
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274 void io_data_write(io_port * pad, m68k_context * context, uint8_t value) |
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275 { |
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276 if (pad->control & TH) { |
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277 //check if TH has changed |
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278 if ((pad->output & TH) ^ (value & TH)) { |
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279 if (context->current_cycle >= pad->timeout_cycle) { |
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280 pad->th_counter = 0; |
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281 } |
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282 if (!(value & TH)) { |
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283 pad->th_counter++; |
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284 } |
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285 pad->timeout_cycle = context->current_cycle + TH_TIMEOUT; |
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286 } |
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287 } |
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288 pad->output = value; |
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289 } |
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290 |
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291 void io_data_read(io_port * pad, m68k_context * context) |
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292 { |
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293 uint8_t control = pad->control | 0x80; |
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294 uint8_t th = control & pad->output; |
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295 uint8_t input; |
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296 if (context->current_cycle >= pad->timeout_cycle) { |
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297 pad->th_counter = 0; |
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298 } |
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299 /*if (pad->input[GAMEPAD_TH0] || pad->input[GAMEPAD_TH1]) { |
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300 printf("io_data_read | control: %X, TH: %X, GAMEPAD_TH0: %X, GAMEPAD_TH1: %X, TH Counter: %d, Timeout: %d, Cycle: %d\n", control, th, pad->input[GAMEPAD_TH0], pad->input[GAMEPAD_TH1], pad->th_counter,pad->timeout_cycle, context->current_cycle); |
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301 }*/ |
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302 if (th) { |
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303 if (pad->th_counter == 2) { |
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304 input = pad->input[GAMEPAD_EXTRA]; |
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305 } else { |
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306 input = pad->input[GAMEPAD_TH1]; |
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307 } |
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308 } else { |
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309 if (pad->th_counter == 2) { |
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310 input = pad->input[GAMEPAD_TH0] | 0xF; |
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311 } else if(pad->th_counter == 3) { |
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312 input = pad->input[GAMEPAD_TH0] & 0x30; |
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313 } else { |
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314 input = pad->input[GAMEPAD_TH0] | 0xC; |
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315 } |
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316 } |
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317 context->value = ((~input) & (~control)) | (pad->output & control); |
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318 /*if (pad->input[GAMEPAD_TH0] || pad->input[GAMEPAD_TH1]) { |
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319 printf ("value: %X\n", context->value); |
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320 }*/ |
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321 } |
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322 |
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323 m68k_context * io_write(uint32_t location, m68k_context * context, uint8_t value) |
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324 { |
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325 if (location < 0x10000) { |
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326 if (busack_cycle > context->current_cycle) { |
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327 busack = new_busack; |
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328 busack_cycle = CYCLE_NEVER; |
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329 } |
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330 if (!(busack || reset)) { |
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331 location &= 0x7FFF; |
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332 if (location < 0x4000) { |
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333 z80_ram[location & 0x1FFF] = value; |
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334 } |
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335 } |
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336 } else { |
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337 location &= 0x1FFF; |
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338 if (location < 0x100) { |
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339 switch(location/2) |
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340 { |
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341 case 0x1: |
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342 io_data_write(&gamepad_1, context, value); |
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343 break; |
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344 case 0x2: |
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345 io_data_write(&gamepad_2, context, value); |
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346 break; |
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347 case 0x3://PORT C Data |
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348 break; |
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349 case 0x4: |
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350 gamepad_1.control = value; |
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351 break; |
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352 case 0x5: |
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353 gamepad_2.control = value; |
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354 break; |
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355 } |
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356 } else { |
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357 if (location == 0x1100) { |
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358 if (busack_cycle > context->current_cycle) { |
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359 busack = new_busack; |
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360 busack_cycle = CYCLE_NEVER; |
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361 } |
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362 if (value & 1) { |
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363 busreq = 1; |
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364 if(!reset) { |
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365 busack_cycle = context->current_cycle + Z80_ACK_DELAY; |
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366 new_busack = 0; |
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367 } |
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368 } else { |
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369 busreq = 0; |
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370 busack_cycle = CYCLE_NEVER; |
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371 busack = 1; |
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372 } |
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373 } else if (location == 0x1200) { |
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374 if (value & 1) { |
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375 if (reset && busreq) { |
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376 new_busack = 0; |
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377 busack_cycle = context->current_cycle + Z80_ACK_DELAY; |
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378 } |
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379 reset = 0; |
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380 } else { |
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381 reset = 1; |
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382 } |
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383 } |
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384 } |
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385 } |
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386 return context; |
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387 } |
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388 |
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389 m68k_context * io_write_w(uint32_t location, m68k_context * context, uint16_t value) |
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390 { |
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391 if (location < 0x10000) { |
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392 if (busack_cycle > context->current_cycle) { |
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393 busack = new_busack; |
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394 busack_cycle = CYCLE_NEVER; |
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395 } |
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396 if (!(busack || reset)) { |
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397 location &= 0x7FFF; |
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398 if (location < 0x4000) { |
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399 z80_ram[location & 0x1FFE] = value >> 8; |
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400 } |
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401 } |
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402 } else { |
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403 location &= 0x1FFF; |
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404 if (location < 0x100) { |
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405 switch(location/2) |
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406 { |
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407 case 0x1: |
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408 io_data_write(&gamepad_1, context, value); |
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409 break; |
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410 case 0x2: |
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411 io_data_write(&gamepad_2, context, value); |
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412 break; |
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413 case 0x3://PORT C Data |
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414 break; |
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415 case 0x4: |
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416 gamepad_1.control = value; |
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417 break; |
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418 case 0x5: |
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419 gamepad_2.control = value; |
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420 break; |
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421 } |
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422 } else { |
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423 //printf("IO Write of %X to %X @ %d\n", value, location, context->current_cycle); |
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424 if (location == 0x1100) { |
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425 if (busack_cycle > context->current_cycle) { |
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426 busack = new_busack; |
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427 busack_cycle = CYCLE_NEVER; |
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428 } |
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429 if (value & 0x100) { |
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430 busreq = 1; |
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431 if(!reset) { |
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432 busack_cycle = context->current_cycle + Z80_ACK_DELAY; |
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433 new_busack = 0; |
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434 } |
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435 } else { |
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436 busreq = 0; |
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437 busack_cycle = CYCLE_NEVER; |
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438 busack = 1; |
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439 } |
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440 } else if (location == 0x1200) { |
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441 if (value & 0x100) { |
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442 if (reset && busreq) { |
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443 new_busack = 0; |
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444 busack_cycle = context->current_cycle + Z80_ACK_DELAY; |
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445 } |
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446 reset = 0; |
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447 } else { |
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448 reset = 1; |
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449 } |
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450 } |
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451 } |
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452 } |
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453 return context; |
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454 } |
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455 |
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456 #define USA 0x80 |
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457 #define JAP 0x00 |
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458 #define EUR 0xC0 |
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459 #define NO_DISK 0x20 |
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460 uint8_t version_reg = NO_DISK | USA; |
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461 |
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462 m68k_context * io_read(uint32_t location, m68k_context * context) |
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463 { |
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464 if (location < 0x10000) { |
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465 if (busack_cycle > context->current_cycle) { |
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466 busack = new_busack; |
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467 busack_cycle = CYCLE_NEVER; |
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468 } |
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469 if (!(busack || reset)) { |
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470 location &= 0x7FFF; |
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471 if (location < 0x4000) { |
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472 context->value = z80_ram[location & 0x1FFF]; |
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473 } else { |
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474 context->value = 0xFF; |
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475 } |
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476 } else { |
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477 context->value = 0xFF; |
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478 } |
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479 } else { |
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480 location &= 0x1FFF; |
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481 if (location < 0x100) { |
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482 switch(location/2) |
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483 { |
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484 case 0x0: |
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485 //version bits should be 0 for now since we're not emulating TMSS |
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486 //Not sure about the other bits |
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487 context->value = version_reg; |
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488 break; |
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489 case 0x1: |
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490 io_data_read(&gamepad_1, context); |
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491 break; |
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492 case 0x2: |
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493 io_data_read(&gamepad_2, context); |
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494 break; |
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495 case 0x3://PORT C Data |
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496 break; |
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497 case 0x4: |
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498 context->value = gamepad_1.control; |
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499 break; |
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500 case 0x5: |
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501 context->value = gamepad_2.control; |
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502 break; |
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503 } |
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504 } else { |
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505 if (location == 0x1100) { |
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506 if (busack_cycle > context->current_cycle) { |
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507 busack = new_busack; |
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508 busack_cycle = CYCLE_NEVER; |
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509 } |
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510 context->value = reset || busack; |
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511 //printf("Byte read of BUSREQ returned %d @ %d (reset: %d, busack: %d)\n", context->value, context->current_cycle, reset, busack); |
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512 } else if (location == 0x1200) { |
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513 context->value = !reset; |
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514 } else { |
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515 printf("Byte read of unknown IO location: %X\n", location); |
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516 } |
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517 } |
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518 } |
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519 return context; |
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520 } |
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521 |
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522 m68k_context * io_read_w(uint32_t location, m68k_context * context) |
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523 { |
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524 if (location < 0x10000) { |
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525 if (busack_cycle > context->current_cycle) { |
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526 busack = new_busack; |
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527 busack_cycle = CYCLE_NEVER; |
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528 } |
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529 if (!(busack || reset)) { |
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530 location &= 0x7FFF; |
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531 if (location < 0x4000) { |
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532 context->value = z80_ram[location & 0x1FFE]; |
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533 context->value |= context->value << 8; |
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534 } else { |
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535 context->value = 0xFFFF; |
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536 } |
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537 } else { |
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538 context->value = 0xFFFF; |
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539 } |
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540 } else { |
153
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541 location &= 0x1FFF; |
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542 if (location < 0x100) { |
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543 switch(location/2) |
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544 { |
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545 case 0x0: |
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546 //version bits should be 0 for now since we're not emulating TMSS |
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547 //Not sure about the other bits |
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548 context->value = 0; |
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549 break; |
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550 case 0x1: |
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551 io_data_read(&gamepad_1, context); |
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552 break; |
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553 case 0x2: |
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554 io_data_read(&gamepad_2, context); |
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555 break; |
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556 case 0x3://PORT C Data |
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557 break; |
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558 case 0x4: |
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559 context->value = gamepad_1.control; |
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560 break; |
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561 case 0x5: |
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562 context->value = gamepad_2.control; |
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|
563 break; |
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|
564 case 0x6: |
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|
565 //PORT C Control |
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566 context->value = 0; |
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567 break; |
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568 } |
153
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|
569 context->value = context->value | (context->value << 8); |
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570 //printf("Word read to %X returned %d\n", location, context->value); |
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571 } else { |
153
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572 if (location == 0x1100) { |
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573 if (busack_cycle > context->current_cycle) { |
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574 busack = new_busack; |
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575 busack_cycle = CYCLE_NEVER; |
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576 } |
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577 context->value = (reset || busack) << 8; |
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578 //printf("Word read of BUSREQ returned %d\n", context->value); |
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579 } else if (location == 0x1200) { |
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580 context->value = (!reset) << 8; |
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581 } else { |
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582 printf("Word read of unknown IO location: %X\n", location); |
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583 } |
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584 } |
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585 } |
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|
586 return context; |
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|
587 } |
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|
588 |
184
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589 typedef struct bp_def { |
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590 struct bp_def * next; |
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591 uint32_t address; |
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592 uint32_t index; |
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593 } bp_def; |
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594 |
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|
595 bp_def * breakpoints = NULL; |
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Fix a bunch of bugs in the CPU core, add a 68K debugger
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|
596 uint32_t bp_index = 0; |
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166
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|
597 |
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|
598 bp_def ** find_breakpoint(bp_def ** cur, uint32_t address) |
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Fix a bunch of bugs in the CPU core, add a 68K debugger
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599 { |
ebcbdd1c4cc8
Fix a bunch of bugs in the CPU core, add a 68K debugger
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diff
changeset
|
600 while (*cur) { |
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|
601 if ((*cur)->address == address) { |
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Fix a bunch of bugs in the CPU core, add a 68K debugger
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166
diff
changeset
|
602 break; |
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166
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changeset
|
603 } |
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Mike Pavone <pavone@retrodev.com>
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166
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|
604 cur = &((*cur)->next); |
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Fix a bunch of bugs in the CPU core, add a 68K debugger
Mike Pavone <pavone@retrodev.com>
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|
605 } |
ebcbdd1c4cc8
Fix a bunch of bugs in the CPU core, add a 68K debugger
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changeset
|
606 return cur; |
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Fix a bunch of bugs in the CPU core, add a 68K debugger
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|
607 } |
ebcbdd1c4cc8
Fix a bunch of bugs in the CPU core, add a 68K debugger
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changeset
|
608 |
ebcbdd1c4cc8
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changeset
|
609 bp_def ** find_breakpoint_idx(bp_def ** cur, uint32_t index) |
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610 { |
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|
611 while (*cur) { |
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612 if ((*cur)->index == index) { |
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613 break; |
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614 } |
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|
615 cur = &((*cur)->next); |
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|
616 } |
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617 return cur; |
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618 } |
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619 |
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|
620 char * find_param(char * buf) |
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621 { |
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Fix a bunch of bugs in the CPU core, add a 68K debugger
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622 for (; *buf; buf++) { |
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623 if (*buf == ' ') { |
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624 if (*(buf+1)) { |
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625 return buf+1; |
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626 } |
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|
627 } |
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Fix a bunch of bugs in the CPU core, add a 68K debugger
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|
628 } |
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|
629 return NULL; |
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Fix a bunch of bugs in the CPU core, add a 68K debugger
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630 } |
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|
631 |
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632 void strip_nl(char * buf) |
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633 { |
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634 for(; *buf; buf++) { |
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Fix a bunch of bugs in the CPU core, add a 68K debugger
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635 if (*buf == '\n') { |
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|
636 *buf = 0; |
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|
637 return; |
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|
638 } |
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|
639 } |
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|
640 } |
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|
641 |
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642 m68k_context * debugger(m68k_context * context, uint32_t address) |
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643 { |
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644 static char last_cmd[1024]; |
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645 char input_buf[1024]; |
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646 static uint32_t branch_t; |
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647 static uint32_t branch_f; |
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|
648 m68kinst inst; |
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|
649 //probably not necessary, but let's play it safe |
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650 address &= 0xFFFFFF; |
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651 if (address == branch_t) { |
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652 bp_def ** f_bp = find_breakpoint(&breakpoints, branch_f); |
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653 if (!*f_bp) { |
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654 remove_breakpoint(context, branch_f); |
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655 } |
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656 branch_t = branch_f = 0; |
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657 } else if(address == branch_f) { |
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658 bp_def ** t_bp = find_breakpoint(&breakpoints, branch_t); |
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659 if (!*t_bp) { |
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660 remove_breakpoint(context, branch_t); |
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661 } |
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662 branch_t = branch_f = 0; |
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663 } |
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664 //Check if this is a user set breakpoint, or just a temporary one |
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665 bp_def ** this_bp = find_breakpoint(&breakpoints, address); |
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666 if (*this_bp) { |
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667 printf("Breakpoint %d hit\n", (*this_bp)->index); |
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668 } else { |
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669 remove_breakpoint(context, address); |
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670 } |
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671 uint16_t * pc; |
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672 if (address < 0x400000) { |
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673 pc = cart + address/2; |
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674 } else if(address > 0xE00000) { |
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675 pc = ram + (address & 0xFFFF)/2; |
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676 } else { |
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677 fprintf(stderr, "Entered debugger at address %X\n", address); |
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678 exit(1); |
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679 } |
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680 uint16_t * after_pc = m68k_decode(pc, &inst, address); |
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681 m68k_disasm(&inst, input_buf); |
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682 printf("%X: %s\n", address, input_buf); |
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683 uint32_t after = address + (after_pc-pc)*2; |
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684 int debugging = 1; |
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685 while (debugging) { |
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686 fputs(">", stdout); |
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687 if (!fgets(input_buf, sizeof(input_buf), stdin)) { |
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688 fputs("fgets failed", stderr); |
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689 break; |
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690 } |
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691 strip_nl(input_buf); |
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692 //hitting enter repeats last command |
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693 if (input_buf[0]) { |
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694 strcpy(last_cmd, input_buf); |
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695 } else { |
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696 strcpy(input_buf, last_cmd); |
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697 } |
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698 char * param; |
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699 char format[8]; |
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700 uint32_t value; |
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701 bp_def * new_bp; |
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702 switch(input_buf[0]) |
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703 { |
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704 case 'c': |
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705 puts("Continuing"); |
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706 debugging = 0; |
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707 break; |
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708 case 'b': |
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709 param = find_param(input_buf); |
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710 if (!param) { |
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711 fputs("b command requires a parameter\n", stderr); |
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712 break; |
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713 } |
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714 value = strtol(param, NULL, 16); |
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715 insert_breakpoint(context, value, (uint8_t *)debugger); |
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716 new_bp = malloc(sizeof(bp_def)); |
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717 new_bp->next = breakpoints; |
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718 new_bp->address = value; |
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719 new_bp->index = bp_index++; |
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720 breakpoints = new_bp; |
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721 printf("Breakpoint %d set at %X\n", new_bp->index, value); |
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722 break; |
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723 case 'a': |
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724 param = find_param(input_buf); |
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725 if (!param) { |
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726 fputs("a command requires a parameter\n", stderr); |
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727 break; |
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728 } |
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729 value = strtol(param, NULL, 16); |
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730 insert_breakpoint(context, value, (uint8_t *)debugger); |
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731 debugging = 0; |
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732 break; |
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|
733 case 'd': |
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734 param = find_param(input_buf); |
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735 if (!param) { |
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736 fputs("b command requires a parameter\n", stderr); |
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737 break; |
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738 } |
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739 value = atoi(param); |
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740 this_bp = find_breakpoint_idx(&breakpoints, value); |
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741 if (!*this_bp) { |
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|
742 fprintf(stderr, "Breakpoint %d does not exist\n", value); |
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|
743 break; |
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744 } |
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745 new_bp = *this_bp; |
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746 *this_bp = (*this_bp)->next; |
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|
747 free(new_bp); |
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|
748 break; |
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749 case 'p': |
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|
750 strcpy(format, "%s: %d\n"); |
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|
751 if (input_buf[1] == '/') { |
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|
752 switch (input_buf[2]) |
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753 { |
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Fix a bunch of bugs in the CPU core, add a 68K debugger
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|
754 case 'x': |
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|
755 case 'X': |
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|
756 case 'd': |
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|
757 case 'c': |
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|
758 format[5] = input_buf[2]; |
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|
759 break; |
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Fix a bunch of bugs in the CPU core, add a 68K debugger
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|
760 default: |
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changeset
|
761 fprintf(stderr, "Unrecognized format character: %c\n", input_buf[2]); |
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762 } |
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763 } |
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764 param = find_param(input_buf); |
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765 if (!param) { |
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766 fputs("p command requires a parameter\n", stderr); |
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767 break; |
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768 } |
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769 if (param[0] == 'd' && param[1] >= '0' && param[1] <= '7') { |
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770 value = context->dregs[param[1]-'0']; |
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771 } else if (param[0] == 'a' && param[1] >= '0' && param[1] <= '7') { |
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772 value = context->aregs[param[1]-'0']; |
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773 } else if (param[0] == 'S' && param[1] == 'R') { |
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|
774 value = (context->status << 8); |
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Fix a bunch of bugs in the CPU core, add a 68K debugger
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775 for (int flag = 0; flag < 5; flag++) { |
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776 value |= context->flags[flag] << (4-flag); |
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777 } |
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778 } else if (param[0] == '0' && param[1] == 'x') { |
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779 uint32_t p_addr = strtol(param+2, NULL, 16); |
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780 value = read_dma_value(p_addr/2); |
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781 } else { |
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782 fprintf(stderr, "Unrecognized parameter to p: %s\n", param); |
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783 break; |
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784 } |
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785 printf(format, param, value); |
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786 break; |
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787 case 'n': |
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788 //TODO: Deal with jmp, dbcc, rtr and rte |
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789 if (inst.op == M68K_RTS) { |
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790 after = (read_dma_value(context->aregs[7]/2) << 16) | read_dma_value(context->aregs[7]/2 + 1); |
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791 } else if(inst.op == M68K_BCC && inst.extra.cond != COND_FALSE) { |
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792 if (inst.extra.cond = COND_TRUE) { |
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793 after = inst.address + 2 + inst.src.params.immed; |
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794 } else { |
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795 branch_f = after; |
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796 branch_t = inst.address + 2 + inst.src.params.immed; |
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797 insert_breakpoint(context, branch_t, (uint8_t *)debugger); |
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798 } |
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799 } |
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800 insert_breakpoint(context, after, (uint8_t *)debugger); |
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801 debugging = 0; |
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802 break; |
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803 case 'q': |
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804 puts("Quitting"); |
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805 exit(0); |
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806 break; |
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807 default: |
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808 fprintf(stderr, "Unrecognized debugger command %s\n", input_buf); |
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809 break; |
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810 } |
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811 } |
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812 return context; |
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813 } |
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814 |
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|
815 int main(int argc, char ** argv) |
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816 { |
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817 if (argc < 2) { |
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818 fputs("Usage: blastem FILENAME\n", stderr); |
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819 return 1; |
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820 } |
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821 if(!load_rom(argv[1])) { |
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822 fprintf(stderr, "Failed to open %s for reading\n", argv[1]); |
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823 return 1; |
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824 } |
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825 int width = -1; |
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826 int height = -1; |
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827 int debug = 0; |
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828 for (int i = 2; i < argc; i++) { |
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829 if (argv[i][0] == '-') { |
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830 switch(argv[i][1]) { |
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831 case 'd': |
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832 debug = 1; |
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833 break; |
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834 default: |
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835 fprintf(stderr, "Unrecognized switch %s\n", argv[i]); |
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836 return 1; |
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837 } |
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838 } else if (width < 0) { |
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839 width = atoi(argv[i]); |
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840 } else if (height < 0) { |
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841 height = atoi(argv[i]); |
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842 } |
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843 } |
184
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844 width = width < 320 ? 320 : width; |
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845 height = height < 240 ? (width/320) * 240 : height; |
88
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|
846 render_init(width, height); |
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|
847 |
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|
848 x86_68k_options opts; |
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|
849 m68k_context context; |
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|
850 vdp_context v_context; |
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|
851 |
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|
852 init_x86_68k_opts(&opts); |
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|
853 init_68k_context(&context, opts.native_code_map, &opts); |
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|
854 init_vdp_context(&v_context); |
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|
855 context.next_context = &v_context; |
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|
856 //cartridge ROM |
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|
857 context.mem_pointers[0] = cart; |
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|
858 context.target_cycle = context.sync_cycle = MCLKS_PER_FRAME/MCLKS_PER_68K; |
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|
859 //work RAM |
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changeset
|
860 context.mem_pointers[1] = ram; |
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|
861 uint32_t address; |
103
a71544cd01ea
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95
diff
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|
862 /*address = cart[0x68/2] << 16 | cart[0x6A/2]; |
95
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89
diff
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|
863 translate_m68k_stream(address, &context); |
88
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|
864 address = cart[0x70/2] << 16 | cart[0x72/2]; |
95
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89
diff
changeset
|
865 translate_m68k_stream(address, &context); |
88
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|
866 address = cart[0x78/2] << 16 | cart[0x7A/2]; |
103
a71544cd01ea
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parents:
95
diff
changeset
|
867 translate_m68k_stream(address, &context);*/ |
88
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changeset
|
868 address = cart[2] << 16 | cart[3]; |
95
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changeset
|
869 translate_m68k_stream(address, &context); |
184
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870 if (debug) { |
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871 insert_breakpoint(&context, address, (uint8_t *)debugger); |
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|
872 } |
88
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changeset
|
873 m68k_reset(&context); |
c339559f1d4f
Forgot to add blastem main file earlier
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
874 return 0; |
c339559f1d4f
Forgot to add blastem main file earlier
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
875 } |