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annotate m68k_core.c @ 573:29d99db6f55d

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author Michael Pavone <pavone@retrodev.com>
date Mon, 03 Mar 2014 22:16:41 -0800
parents 76bba9ffe351
children 1594525e2157
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570
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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1 /*
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2 Copyright 2014 Michael Pavone
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3 This file is part of BlastEm.
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4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
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5 */
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6 #include "m68k_core.h"
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7 #include "m68k_internal.h"
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8 #include "68kinst.h"
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9 #include "backend.h"
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10 #include "gen.h"
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11 #include <stdio.h>
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12 #include <stddef.h>
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13 #include <stdlib.h>
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14 #include <string.h>
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15
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16 int8_t native_reg(m68k_op_info * op, m68k_options * opts)
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17 {
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18 if (op->addr_mode == MODE_REG) {
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19 return opts->dregs[op->params.regs.pri];
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20 }
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21 if (op->addr_mode == MODE_AREG) {
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22 return opts->aregs[op->params.regs.pri];
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23 }
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24 return -1;
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25 }
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26
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27 //must be called with an m68k_op_info that uses a register
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28 size_t reg_offset(m68k_op_info *op)
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29 {
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30 if (op->addr_mode == MODE_REG) {
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31 return offsetof(m68k_context, dregs) + sizeof(uint32_t) * op->params.regs.pri;
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32 }
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33 return offsetof(m68k_context, aregs) + sizeof(uint32_t) * op->params.regs.pri;
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34 }
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35
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36 void print_regs_exit(m68k_context * context)
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37 {
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38 printf("XNZVC\n%d%d%d%d%d\n", context->flags[0], context->flags[1], context->flags[2], context->flags[3], context->flags[4]);
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39 for (int i = 0; i < 8; i++) {
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40 printf("d%d: %X\n", i, context->dregs[i]);
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41 }
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42 for (int i = 0; i < 8; i++) {
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43 printf("a%d: %X\n", i, context->aregs[i]);
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44 }
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45 exit(0);
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46 }
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47
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48 void m68k_read_size(m68k_options *opts, uint8_t size)
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49 {
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50 switch (size)
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51 {
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52 case OPSIZE_BYTE:
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53 call(&opts->gen.code, opts->read_8);
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54 break;
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55 case OPSIZE_WORD:
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56 call(&opts->gen.code, opts->read_16);
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57 break;
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58 case OPSIZE_LONG:
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59 call(&opts->gen.code, opts->read_32);
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60 break;
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61 }
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62 }
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63
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64 void m68k_write_size(m68k_options *opts, uint8_t size)
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65 {
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66 switch (size)
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67 {
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68 case OPSIZE_BYTE:
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69 call(&opts->gen.code, opts->write_8);
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70 break;
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71 case OPSIZE_WORD:
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72 call(&opts->gen.code, opts->write_16);
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73 break;
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74 case OPSIZE_LONG:
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75 call(&opts->gen.code, opts->write_32_highfirst);
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76 break;
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77 }
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78 }
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79
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80 code_ptr get_native_address(native_map_slot * native_code_map, uint32_t address)
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81 {
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82 address &= 0xFFFFFF;
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83 address /= 2;
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84 uint32_t chunk = address / NATIVE_CHUNK_SIZE;
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85 if (!native_code_map[chunk].base) {
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86 return NULL;
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87 }
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88 uint32_t offset = address % NATIVE_CHUNK_SIZE;
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89 if (native_code_map[chunk].offsets[offset] == INVALID_OFFSET || native_code_map[chunk].offsets[offset] == EXTENSION_WORD) {
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90 return NULL;
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91 }
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92 return native_code_map[chunk].base + native_code_map[chunk].offsets[offset];
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93 }
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94
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95 code_ptr get_native_from_context(m68k_context * context, uint32_t address)
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96 {
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97 return get_native_address(context->native_code_map, address);
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98 }
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99
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100 uint32_t get_instruction_start(native_map_slot * native_code_map, uint32_t address)
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101 {
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102 address &= 0xFFFFFF;
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103 address /= 2;
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104 uint32_t chunk = address / NATIVE_CHUNK_SIZE;
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105 if (!native_code_map[chunk].base) {
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106 return 0;
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107 }
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108 uint32_t offset = address % NATIVE_CHUNK_SIZE;
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109 if (native_code_map[chunk].offsets[offset] == INVALID_OFFSET) {
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110 return 0;
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111 }
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112 while (native_code_map[chunk].offsets[offset] == EXTENSION_WORD) {
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113 --address;
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114 chunk = address / NATIVE_CHUNK_SIZE;
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115 offset = address % NATIVE_CHUNK_SIZE;
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116 }
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117 return address*2;
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118 }
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119
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120 void map_native_address(m68k_context * context, uint32_t address, code_ptr native_addr, uint8_t size, uint8_t native_size)
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121 {
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122 native_map_slot * native_code_map = context->native_code_map;
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123 m68k_options * opts = context->options;
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124 address &= 0xFFFFFF;
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125 if (address > 0xE00000) {
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126 context->ram_code_flags[(address & 0xC000) >> 14] |= 1 << ((address & 0x3800) >> 11);
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127 if (((address & 0x3FFF) + size) & 0xC000) {
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128 context->ram_code_flags[((address+size) & 0xC000) >> 14] |= 1 << (((address+size) & 0x3800) >> 11);
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129 }
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130 uint32_t slot = (address & 0xFFFF)/1024;
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131 if (!opts->gen.ram_inst_sizes[slot]) {
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132 opts->gen.ram_inst_sizes[slot] = malloc(sizeof(uint8_t) * 512);
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133 }
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134 opts->gen.ram_inst_sizes[slot][((address & 0xFFFF)/2)%512] = native_size;
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135 }
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136 address/= 2;
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137 uint32_t chunk = address / NATIVE_CHUNK_SIZE;
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138 if (!native_code_map[chunk].base) {
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139 native_code_map[chunk].base = native_addr;
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140 native_code_map[chunk].offsets = malloc(sizeof(int32_t) * NATIVE_CHUNK_SIZE);
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141 memset(native_code_map[chunk].offsets, 0xFF, sizeof(int32_t) * NATIVE_CHUNK_SIZE);
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142 }
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143 uint32_t offset = address % NATIVE_CHUNK_SIZE;
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144 native_code_map[chunk].offsets[offset] = native_addr-native_code_map[chunk].base;
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145 for(address++,size-=2; size; address++,size-=2) {
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146 chunk = address / NATIVE_CHUNK_SIZE;
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147 offset = address % NATIVE_CHUNK_SIZE;
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148 if (!native_code_map[chunk].base) {
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149 native_code_map[chunk].base = native_addr;
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150 native_code_map[chunk].offsets = malloc(sizeof(int32_t) * NATIVE_CHUNK_SIZE);
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151 memset(native_code_map[chunk].offsets, 0xFF, sizeof(int32_t) * NATIVE_CHUNK_SIZE);
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152 }
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153 native_code_map[chunk].offsets[offset] = EXTENSION_WORD;
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154 }
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155 }
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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diff changeset
156
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157 uint8_t get_native_inst_size(m68k_options * opts, uint32_t address)
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158 {
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159 if (address < 0xE00000) {
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160 return 0;
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161 }
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162 uint32_t slot = (address & 0xFFFF)/1024;
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163 return opts->gen.ram_inst_sizes[slot][((address & 0xFFFF)/2)%512];
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164 }
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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diff changeset
165
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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166 uint8_t m68k_is_terminal(m68kinst * inst)
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167 {
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168 return inst->op == M68K_RTS || inst->op == M68K_RTE || inst->op == M68K_RTR || inst->op == M68K_JMP
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169 || inst->op == M68K_TRAP || inst->op == M68K_ILLEGAL || inst->op == M68K_INVALID || inst->op == M68K_RESET
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170 || (inst->op == M68K_BCC && inst->extra.cond == COND_TRUE);
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171 }
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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172
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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173 void m68k_handle_deferred(m68k_context * context)
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174 {
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175 m68k_options * opts = context->options;
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176 process_deferred(&opts->gen.deferred, context, (native_addr_func)get_native_from_context);
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177 if (opts->gen.deferred) {
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178 translate_m68k_stream(opts->gen.deferred->address, context);
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179 }
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180 }
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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181
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182 void translate_m68k_stream(uint32_t address, m68k_context * context)
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183 {
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184 m68kinst instbuf;
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185 m68k_options * opts = context->options;
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186 code_info *code = &opts->gen.code;
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187 address &= 0xFFFFFF;
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188 if(get_native_address(opts->gen.native_code_map, address)) {
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189 return;
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190 }
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191 char disbuf[1024];
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diff changeset
192 uint16_t *encoded, *next;
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diff changeset
193 if ((address & 0xFFFFFF) < 0x400000) {
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diff changeset
194 encoded = context->mem_pointers[0] + (address & 0xFFFFFF)/2;
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195 } else if ((address & 0xFFFFFF) > 0xE00000) {
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196 encoded = context->mem_pointers[1] + (address & 0xFFFF)/2;
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197 } else {
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198 printf("attempt to translate non-memory address: %X\n", address);
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199 exit(1);
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diff changeset
200 }
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
201 do {
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diff changeset
202 if (opts->address_log) {
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diff changeset
203 fprintf(opts->address_log, "%X\n", address);
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204 }
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
205 do {
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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diff changeset
206 if (address >= 0x400000 && address < 0xE00000) {
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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diff changeset
207 translate_out_of_bounds(code);
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diff changeset
208 break;
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
209 }
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
210 code_ptr existing = get_native_address(opts->gen.native_code_map, address);
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diff changeset
211 if (existing) {
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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diff changeset
212 jmp(code, existing);
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
213 break;
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
214 }
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
215 next = m68k_decode(encoded, &instbuf, address);
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
216 if (instbuf.op == M68K_INVALID) {
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
217 instbuf.src.params.immed = *encoded;
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
218 }
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
219 uint16_t m68k_size = (next-encoded)*2;
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parents:
diff changeset
220 address += m68k_size;
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parents:
diff changeset
221 encoded = next;
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
222 //m68k_disasm(&instbuf, disbuf);
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
223 //printf("%X: %s\n", instbuf.address, disbuf);
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
224
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
225 //make sure the beginning of the code for an instruction is contiguous
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
226 check_code_prologue(code);
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
227 code_ptr start = code->cur;
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
228 translate_m68k(opts, &instbuf);
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
229 code_ptr after = code->cur;
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
230 map_native_address(context, instbuf.address, start, m68k_size, after-start);
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
231 } while(!m68k_is_terminal(&instbuf));
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
232 process_deferred(&opts->gen.deferred, context, (native_addr_func)get_native_from_context);
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
233 if (opts->gen.deferred) {
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parents:
diff changeset
234 address = opts->gen.deferred->address;
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
235 if ((address & 0xFFFFFF) < 0x400000) {
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
236 encoded = context->mem_pointers[0] + (address & 0xFFFFFF)/2;
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
237 } else if ((address & 0xFFFFFF) > 0xE00000) {
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
238 encoded = context->mem_pointers[1] + (address & 0xFFFF)/2;
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
239 } else {
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
240 printf("attempt to translate non-memory address: %X\n", address);
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
241 exit(1);
76bba9ffe351 Initial stab at separating the generic parts of the 68K core from the host-cpu specific parts.
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parents:
diff changeset
242 }
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243 } else {
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244 encoded = NULL;
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245 }
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246 } while(encoded != NULL);
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247 }
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248
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249 code_ptr get_native_address_trans(m68k_context * context, uint32_t address)
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250 {
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251 address &= 0xFFFFFF;
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252 code_ptr ret = get_native_address(context->native_code_map, address);
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253 if (!ret) {
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254 translate_m68k_stream(address, context);
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255 ret = get_native_address(context->native_code_map, address);
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256 }
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257 return ret;
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258 }
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259
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260 void remove_breakpoint(m68k_context * context, uint32_t address)
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261 {
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262 code_ptr native = get_native_address(context->native_code_map, address);
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263 check_cycles_int(context->options, address);
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264 }
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265
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266 void start_68k_context(m68k_context * context, uint32_t address)
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267 {
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268 code_ptr addr = get_native_address_trans(context, address);
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269 m68k_options * options = context->options;
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270 options->start_context(addr, context);
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271 }
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272
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273 void m68k_reset(m68k_context * context)
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274 {
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275 //TODO: Make this actually use the normal read functions
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276 context->aregs[7] = context->mem_pointers[0][0] << 16 | context->mem_pointers[0][1];
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277 uint32_t address = context->mem_pointers[0][2] << 16 | context->mem_pointers[0][3];
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278 start_68k_context(context, address);
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279 }
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280