Shamusworld >> Repos - virtualjaguar/blob - src/jaguar.cpp

   1 //
   2 // JAGUAR.CPP
   3 //
   4 // by Cal2
   5 // GCC/SDL port by Niels Wagenaar (Linux/WIN32) and Caz (BeOS)
   6 // Cleanups and endian wrongness amelioration by James L. Hammons
   7 // Note: Endian wrongness probably stems from the MAME origins of this emu and
   8 //       the braindead way in which MAME handles memory. :-)
   9 //
  10
  11 #include "jaguar.h"
  12 #include "video.h"
  13 #include "settings.h"
  14 //#include "m68kdasmAG.h"
  15
  16 #define CPU_DEBUG
  17 //Do this in makefile??? Yes! Could, but it's easier to define here...
  18 #define LOG_UNMAPPED_MEMORY_ACCESSES
  19 #define CPU_DEBUG_MEMORY
  20
  21 // Private function prototypes
  22
  23 unsigned jaguar_unknown_readbyte(unsigned address, uint32 who = UNKNOWN);
  24 unsigned jaguar_unknown_readword(unsigned address, uint32 who = UNKNOWN);
  25 void jaguar_unknown_writebyte(unsigned address, unsigned data, uint32 who = UNKNOWN);
  26 void jaguar_unknown_writeword(unsigned address, unsigned data, uint32 who = UNKNOWN);
  27 void M68K_show_context(void);
  28
  29 // External variables
  30
  31 //extern bool hardwareTypeNTSC;                                         // Set to false for PAL
  32 #ifdef CPU_DEBUG_MEMORY
  33 extern bool startMemLog;                                                        // Set by "e" key
  34 extern int effect_start;
  35 extern int effect_start2, effect_start3, effect_start4, effect_start5, effect_start6;
  36 #endif
  37
  38 // Memory debugging identifiers
  39
  40 char * whoName[9] =
  41         { "Unknown", "Jaguar", "DSP", "GPU", "TOM", "JERRY", "M68K", "Blitter", "OP" };
  42
  43 uint32 jaguar_active_memory_dumps = 0;
  44
  45 uint32 jaguar_mainRom_crc32;
  46
  47 /*static*/ uint8 * jaguar_mainRam = NULL;
  48 /*static*/ uint8 * jaguar_bootRom = NULL;
  49 /*static*/ uint8 * jaguar_mainRom = NULL;
  50
  51 #ifdef CPU_DEBUG_MEMORY
  52 uint8 writeMemMax[0x400000], writeMemMin[0x400000];
  53 uint8 readMem[0x400000];
  54 uint32 returnAddr[4000], raPtr = 0xFFFFFFFF;
  55 #endif
  56
  57 uint32 pcQueue[0x400];
  58 uint32 pcQPtr = 0;
  59
  60 //
  61 // Callback function to detect illegal instructions
  62 //
  63 //void GPUDumpDisassembly(void);
  64 //void GPUDumpRegisters(void);
  65 void M68KInstructionHook(void)
  66 {
  67         uint32 m68kPC = m68k_get_reg(NULL, M68K_REG_PC);
  68
  69 // For tracebacks...
  70 // Ideally, we'd save all the registers as well...
  71         pcQueue[pcQPtr++] = m68kPC;
  72         pcQPtr &= 0x3FF;
  73
  74         if (m68kPC & 0x01)              // Oops! We're fetching an odd address!
  75         {
  76                 WriteLog("M68K: Attempted to execute from an odd adress!\n\nBacktrace:\n\n");
  77
  78                 static char buffer[2048];
  79                 for(int i=0; i<0x400; i++)
  80                 {
  81                         m68k_disassemble(buffer, pcQueue[(pcQPtr + i) & 0x3FF], M68K_CPU_TYPE_68000);
  82                         WriteLog("\t%08X: %s\n", pcQueue[(pcQPtr + i) & 0x3FF], buffer);
  83                 }
  84                 WriteLog("\n");
  85
  86                 uint32 topOfStack = m68k_get_reg(NULL, M68K_REG_A7);
  87                 WriteLog("M68K: Top of stack: %08X. Stack trace:\n", JaguarReadLong(topOfStack));
  88                 for(int i=0; i<10; i++)
  89                         WriteLog("%06X: %08X\n", topOfStack - (i * 4), JaguarReadLong(topOfStack - (i * 4)));
  90                 WriteLog("Jaguar: VBL interrupt is %s\n", ((tom_irq_enabled(IRQ_VBLANK)) && (jaguar_interrupt_handler_is_valid(64))) ? "enabled" : "disabled");
  91                 M68K_show_context();
  92                 log_done();
  93                 exit(0);
  94         }
  95
  96 /*      if (m68kPC >= 0x807EC4 && m68kPC <= 0x807EDB)
  97         {
  98                 static char buffer[2048];
  99                 m68k_disassemble(buffer, m68kPC, M68K_CPU_TYPE_68000);
 100                 WriteLog("%08X: %s", m68kPC, buffer);
 101                 WriteLog("\t\tA0=%08X, A1=%08X, D0=%08X, D1=%08X\n",
 102                         m68k_get_reg(NULL, M68K_REG_A0), m68k_get_reg(NULL, M68K_REG_A1),
 103                         m68k_get_reg(NULL, M68K_REG_D0), m68k_get_reg(NULL, M68K_REG_D1));
 104         }//*/
 105 /*      if (m68kPC == 0x8D0E48 && effect_start5)
 106         {
 107                 WriteLog("\nM68K: At collision detection code. Exiting!\n\n");
 108                 GPUDumpRegisters();
 109                 GPUDumpDisassembly();
 110                 log_done();
 111                 exit(0);
 112         }//*/
 113 /*      uint16 opcode = JaguarReadWord(m68kPC);
 114         if (opcode == 0x4E75)   // RTS
 115         {
 116                 if (startMemLog)
 117 //                      WriteLog("Jaguar: Returning from subroutine to %08X\n", JaguarReadLong(m68k_get_reg(NULL, M68K_REG_A7)));
 118                 {
 119                         uint32 addr = JaguarReadLong(m68k_get_reg(NULL, M68K_REG_A7));
 120                         bool found = false;
 121                         if (raPtr != 0xFFFFFFFF)
 122                         {
 123                                 for(uint32 i=0; i<=raPtr; i++)
 124                                 {
 125                                         if (returnAddr[i] == addr)
 126                                         {
 127                                                 found = true;
 128                                                 break;
 129                                         }
 130                                 }
 131                         }
 132
 133                         if (!found)
 134                                 returnAddr[++raPtr] = addr;
 135                 }
 136         }//*/
 137
 138 /*      static char buffer[2048];
 139         m68k_disassemble(buffer, m68kPC, M68K_CPU_TYPE_68000);
 140         WriteLog("%08X: %s \t\tD0=%08X, A0=%08X\n", m68kPC, buffer, m68k_get_reg(NULL, M68K_REG_D0), m68k_get_reg(NULL, M68K_REG_A0));//*/
 141
 142 /*      if (m68kPC == 0x803F16)
 143         {
 144                 WriteLog("M68K: Registers found at $803F16:\n");
 145                 WriteLog("\t68K PC=%06X\n", m68k_get_reg(NULL, M68K_REG_PC));
 146                 for(int i=M68K_REG_D0; i<=M68K_REG_D7; i++)
 147                         WriteLog("\tD%i = %08X\n", i-M68K_REG_D0, m68k_get_reg(NULL, (m68k_register_t)i));
 148                 WriteLog("\n");
 149                 for(int i=M68K_REG_A0; i<=M68K_REG_A7; i++)
 150                         WriteLog("\tA%i = %08X\n", i-M68K_REG_A0, m68k_get_reg(NULL, (m68k_register_t)i));
 151         }*/
 152
 153         if (!m68k_is_valid_instruction(m68k_read_memory_16(m68kPC), M68K_CPU_TYPE_68000))
 154         {
 155                 WriteLog("\nM68K encountered an illegal instruction at %08X!!!\n\nAborting!\n", m68kPC);
 156                 uint32 topOfStack = m68k_get_reg(NULL, M68K_REG_A7);
 157                 WriteLog("M68K: Top of stack: %08X. Stack trace:\n", JaguarReadLong(topOfStack));
 158                 for(int i=0; i<10; i++)
 159                         WriteLog("%06X: %08X\n", topOfStack - (i * 4), JaguarReadLong(topOfStack - (i * 4)));
 160                 WriteLog("Jaguar: VBL interrupt is %s\n", ((tom_irq_enabled(IRQ_VBLANK)) && (jaguar_interrupt_handler_is_valid(64))) ? "enabled" : "disabled");
 161                 M68K_show_context();
 162                 log_done();
 163                 exit(0);
 164         }//*/
 165 }
 166
 167 //
 168 // Musashi 68000 read/write/IRQ functions
 169 //
 170
 171 int irq_ack_handler(int level)
 172 {
 173         int vector = M68K_INT_ACK_AUTOVECTOR;
 174
 175         // The GPU/DSP/etc are probably *not* issuing an NMI, but it seems to work OK...
 176
 177         if (level == 7)
 178         {
 179                 m68k_set_irq(0);                                                // Clear the IRQ...
 180                 vector = 64;                                                    // Set user interrupt #0
 181         }
 182
 183         return vector;
 184 }
 185
 186 unsigned int m68k_read_memory_8(unsigned int address)
 187 {
 188 #ifdef CPU_DEBUG_MEMORY
 189         if ((address >= 0x000000) && (address <= 0x3FFFFF))
 190         {
 191                 if (startMemLog)
 192                         readMem[address] = 1;
 193         }
 194 #endif
 195 //WriteLog("[RM8] Addr: %08X\n", address);
 196         unsigned int retVal = 0;
 197
 198         if ((address >= 0x000000) && (address <= 0x3FFFFF))
 199                 retVal = jaguar_mainRam[address];
 200         else if ((address >= 0x800000) && (address <= 0xDFFFFF))
 201                 retVal = jaguar_mainRom[address - 0x800000];
 202         else if ((address >= 0xE00000) && (address <= 0xE3FFFF))
 203                 retVal = jaguar_bootRom[address - 0xE00000];
 204         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFF))
 205                 retVal = CDROMReadByte(address);
 206         else if ((address >= 0xF00000) && (address <= 0xF0FFFF))
 207                 retVal = TOMReadByte(address, M68K);
 208         else if ((address >= 0xF10000) && (address <= 0xF1FFFF))
 209                 retVal = JERRYReadByte(address, M68K);
 210         else
 211                 retVal = jaguar_unknown_readbyte(address, M68K);
 212
 213     return retVal;
 214 }
 215
 216 void gpu_dump_disassembly(void);
 217 void gpu_dump_registers(void);
 218
 219 unsigned int m68k_read_memory_16(unsigned int address)
 220 {
 221 #ifdef CPU_DEBUG_MEMORY
 222 /*      if ((address >= 0x000000) && (address <= 0x3FFFFE))
 223         {
 224                 if (startMemLog)
 225                         readMem[address] = 1, readMem[address + 1] = 1;
 226         }//*/
 227 /*      if (effect_start && (address >= 0x8064FC && address <= 0x806501))
 228         {
 229                 return 0x4E71;  // NOP
 230         }
 231         if (effect_start2 && (address >= 0x806502 && address <= 0x806507))
 232         {
 233                 return 0x4E71;  // NOP
 234         }
 235         if (effect_start3 && (address >= 0x806512 && address <= 0x806517))
 236         {
 237                 return 0x4E71;  // NOP
 238         }
 239         if (effect_start4 && (address >= 0x806524 && address <= 0x806527))
 240         {
 241                 return 0x4E71;  // NOP
 242         }
 243         if (effect_start5 && (address >= 0x80653E && address <= 0x806543)) //Collision detection!
 244         {
 245                 return 0x4E71;  // NOP
 246         }
 247         if (effect_start6 && (address >= 0x806544 && address <= 0x806547))
 248         {
 249                 return 0x4E71;  // NOP
 250         }//*/
 251 #endif
 252 //WriteLog("[RM16] Addr: %08X\n", address);
 253 /*if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00005FBA)
 254 //      for(int i=0; i<10000; i++)
 255         WriteLog("[M68K] In routine #6!\n");//*/
 256 //if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00006696) // GPU Program #4
 257 //if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00005B3C)    // GPU Program #2
 258 /*if (m68k_get_reg(NULL, M68K_REG_PC) == 0x00005BA8)    // GPU Program #3
 259 {
 260         WriteLog("[M68K] About to run GPU! (Addr:%08X, data:%04X)\n", address, TOMReadWord(address));
 261         gpu_dump_registers();
 262         gpu_dump_disassembly();
 263 //      for(int i=0; i<10000; i++)
 264 //              WriteLog("[M68K] About to run GPU!\n");
 265 }//*/
 266 //WriteLog("[WM8  PC=%08X] Addr: %08X, val: %02X\n", m68k_get_reg(NULL, M68K_REG_PC), address, value);
 267 /*if (m68k_get_reg(NULL, M68K_REG_PC) >= 0x00006696 && m68k_get_reg(NULL, M68K_REG_PC) <= 0x000066A8)
 268 {
 269         if (address == 0x000066A0)
 270         {
 271                 gpu_dump_registers();
 272                 gpu_dump_disassembly();
 273         }
 274         for(int i=0; i<10000; i++)
 275                 WriteLog("[M68K] About to run GPU! (Addr:%08X, data:%04X)\n", address, TOMReadWord(address));
 276 }//*/
 277     unsigned int retVal = 0;
 278
 279         if ((address >= 0x000000) && (address <= 0x3FFFFE))
 280                 retVal = (jaguar_mainRam[address] << 8) | jaguar_mainRam[address+1];
 281         else if ((address >= 0x800000) && (address <= 0xDFFFFE))
 282                 retVal = (jaguar_mainRom[address - 0x800000] << 8) | jaguar_mainRom[address - 0x800000 + 1];
 283         else if ((address >= 0xE00000) && (address <= 0xE3FFFE))
 284                 retVal = (jaguar_bootRom[address - 0xE00000] << 8) | jaguar_bootRom[address - 0xE00000 + 1];
 285         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFE))
 286                 retVal = CDROMReadWord(address, M68K);
 287         else if ((address >= 0xF00000) && (address <= 0xF0FFFE))
 288                 retVal = TOMReadWord(address, M68K);
 289         else if ((address >= 0xF10000) && (address <= 0xF1FFFE))
 290                 retVal = JERRYReadWord(address, M68K);
 291         else
 292                 retVal = jaguar_unknown_readword(address, M68K);
 293
 294     return retVal;
 295 }
 296
 297 unsigned int m68k_read_memory_32(unsigned int address)
 298 {
 299 //WriteLog("--> [RM32]\n");
 300     return (m68k_read_memory_16(address) << 16) | m68k_read_memory_16(address + 2);
 301 }
 302
 303 void m68k_write_memory_8(unsigned int address, unsigned int value)
 304 {
 305 #ifdef CPU_DEBUG_MEMORY
 306         if ((address >= 0x000000) && (address <= 0x3FFFFF))
 307         {
 308                 if (startMemLog)
 309                 {
 310                         if (value > writeMemMax[address])
 311                                 writeMemMax[address] = value;
 312                         if (value < writeMemMin[address])
 313                                 writeMemMin[address] = value;
 314                 }
 315         }
 316 #endif
 317 //if ((address >= 0x1FF020 && address <= 0x1FF03F) || (address >= 0x1FF820 && address <= 0x1FF83F))
 318 //      WriteLog("M68K: Writing %02X at %08X\n", value, address);
 319 //WriteLog("[WM8  PC=%08X] Addr: %08X, val: %02X\n", m68k_get_reg(NULL, M68K_REG_PC), address, value);
 320         if ((address >= 0x000000) && (address <= 0x3FFFFF))
 321                 jaguar_mainRam[address] = value;
 322         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFF))
 323                 CDROMWriteByte(address, value, M68K);
 324         else if ((address >= 0xF00000) && (address <= 0xF0FFFF))
 325                 TOMWriteByte(address, value, M68K);
 326         else if ((address >= 0xF10000) && (address <= 0xF1FFFF))
 327                 JERRYWriteByte(address, value, M68K);
 328         else
 329                 jaguar_unknown_writebyte(address, value, M68K);
 330 }
 331
 332 void m68k_write_memory_16(unsigned int address, unsigned int value)
 333 {
 334 #ifdef CPU_DEBUG_MEMORY
 335         if ((address >= 0x000000) && (address <= 0x3FFFFE))
 336         {
 337                 if (startMemLog)
 338                 {
 339                         uint8 hi = value >> 8, lo = value & 0xFF;
 340
 341                         if (hi > writeMemMax[address])
 342                                 writeMemMax[address] = hi;
 343                         if (hi < writeMemMin[address])
 344                                 writeMemMin[address] = hi;
 345
 346                         if (lo > writeMemMax[address+1])
 347                                 writeMemMax[address+1] = lo;
 348                         if (lo < writeMemMin[address+1])
 349                                 writeMemMin[address+1] = lo;
 350                 }
 351         }
 352 #endif
 353 //if ((address >= 0x1FF020 && address <= 0x1FF03F) || (address >= 0x1FF820 && address <= 0x1FF83F))
 354 //      WriteLog("M68K: Writing %04X at %08X\n", value, address);
 355 //WriteLog("[WM16 PC=%08X] Addr: %08X, val: %04X\n", m68k_get_reg(NULL, M68K_REG_PC), address, value);
 356 //if (address >= 0xF02200 && address <= 0xF0229F)
 357 //      WriteLog("M68K: Writing to blitter --> %04X at %08X\n", value, address);
 358 //if (address >= 0x0E75D0 && address <= 0x0E75E7)
 359 //      WriteLog("M68K: Writing %04X at %08X, M68K PC=%08X\n", value, address, m68k_get_reg(NULL, M68K_REG_PC));
 360 /*extern uint32 totalFrames;
 361 if (address == 0xF02114)
 362         WriteLog("M68K: Writing to GPU_CTRL (frame:%u)... [M68K PC:%08X]\n", totalFrames, m68k_get_reg(NULL, M68K_REG_PC));
 363 if (address == 0xF02110)
 364         WriteLog("M68K: Writing to GPU_PC (frame:%u)... [M68K PC:%08X]\n", totalFrames, m68k_get_reg(NULL, M68K_REG_PC));//*/
 365 //if (address >= 0xF03B00 && address <= 0xF03DFF)
 366 //      WriteLog("M68K: Writing %04X to %08X...\n", value, address);
 367
 368         if ((address >= 0x000000) && (address <= 0x3FFFFE))
 369         {
 370 /*              jaguar_mainRam[address] = value >> 8;
 371                 jaguar_mainRam[address + 1] = value & 0xFF;*/
 372                 SET16(jaguar_mainRam, address, value);
 373         }
 374         else if ((address >= 0xDFFF00) && (address <= 0xDFFFFE))
 375                 CDROMWriteWord(address, value, M68K);
 376         else if ((address >= 0xF00000) && (address <= 0xF0FFFE))
 377                 TOMWriteWord(address, value, M68K);
 378         else if ((address >= 0xF10000) && (address <= 0xF1FFFE))
 379                 JERRYWriteWord(address, value, M68K);
 380         else
 381         {
 382                 jaguar_unknown_writeword(address, value, M68K);
 383                 WriteLog("\tA0=%08X, A1=%08X, D0=%08X, D1=%08X\n",
 384                         m68k_get_reg(NULL, M68K_REG_A0), m68k_get_reg(NULL, M68K_REG_A1),
 385                         m68k_get_reg(NULL, M68K_REG_D0), m68k_get_reg(NULL, M68K_REG_D1));
 386         }
 387 }
 388
 389 void m68k_write_memory_32(unsigned int address, unsigned int value)
 390 {
 391 //WriteLog("--> [WM32]\n");
 392         m68k_write_memory_16(address, value >> 16);
 393         m68k_write_memory_16(address + 2, value & 0xFFFF);
 394 }
 395
 396
 397 uint32 jaguar_get_handler(uint32 i)
 398 {
 399         return JaguarReadLong(i * 4);
 400 }
 401
 402 uint32 jaguar_interrupt_handler_is_valid(uint32 i)
 403 {
 404         uint32 handler = jaguar_get_handler(i);
 405         if (handler && (handler != 0xFFFFFFFF))
 406                 return 1;
 407         else
 408                 return 0;
 409 }
 410
 411 void M68K_show_context(void)
 412 {
 413         WriteLog("\t68K PC=%06X\n", m68k_get_reg(NULL, M68K_REG_PC));
 414         for(int i=M68K_REG_D0; i<=M68K_REG_D7; i++)
 415                 WriteLog("\tD%i = %08X\n", i-M68K_REG_D0, m68k_get_reg(NULL, (m68k_register_t)i));
 416         WriteLog("\n");
 417         for(int i=M68K_REG_A0; i<=M68K_REG_A7; i++)
 418                 WriteLog("\tA%i = %08X\n", i-M68K_REG_A0, m68k_get_reg(NULL, (m68k_register_t)i));
 419
 420         WriteLog("68K disasm\n");
 421 //      jaguar_dasm(s68000readPC()-0x1000,0x20000);
 422         jaguar_dasm(m68k_get_reg(NULL, M68K_REG_PC) - 0x80, 0x200);
 423 //      jaguar_dasm(0x5000, 0x14414);
 424
 425         WriteLog("..................\n");
 426
 427         if (tom_irq_enabled(IRQ_VBLANK))
 428         {
 429                 WriteLog("vblank int: enabled\n");
 430                 jaguar_dasm(jaguar_get_handler(64), 0x200);
 431         }
 432         else
 433                 WriteLog("vblank int: disabled\n");
 434
 435         WriteLog("..................\n");
 436
 437         for(int i=0; i<256; i++)
 438                 WriteLog("handler %03i at $%08X\n", i, (unsigned int)jaguar_get_handler(i));
 439 }
 440
 441 //
 442 // Unknown read/write byte/word routines
 443 //
 444
 445 // It's hard to believe that developers would be sloppy with their memory writes, yet in
 446 // some cases the developers screwed up royal. E.g., Club Drive has the following code:
 447 //
 448 // 807EC4: movea.l #$f1b000, A1
 449 // 807ECA: movea.l #$8129e0, A0
 450 // 807ED0: move.l  A0, D0
 451 // 807ED2: move.l  #$f1bb94, D1
 452 // 807ED8: sub.l   D0, D1
 453 // 807EDA: lsr.l   #2, D1
 454 // 807EDC: move.l  (A0)+, (A1)+
 455 // 807EDE: dbra    D1, 807edc
 456 //
 457 // The problem is at $807ED0--instead of putting A0 into D0, they really meant to put A1
 458 // in. This mistake causes it to try and overwrite approximately $700000 worth of address
 459 // space! (That is, unless the 68K causes a bus error...)
 460
 461 void jaguar_unknown_writebyte(unsigned address, unsigned data, uint32 who/*=UNKNOWN*/)
 462 {
 463 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 464         WriteLog("Jaguar: Unknown byte %02X written at %08X by %s (M68K PC=%06X)\n", data, address, whoName[who], m68k_get_reg(NULL, M68K_REG_PC));
 465         extern bool finished;
 466         finished = true;
 467         extern bool doDSPDis;
 468         if (who == DSP)
 469                 doDSPDis = true;
 470 #endif
 471 }
 472
 473 void jaguar_unknown_writeword(unsigned address, unsigned data, uint32 who/*=UNKNOWN*/)
 474 {
 475 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 476         WriteLog("Jaguar: Unknown word %04X written at %08X by %s (M68K PC=%06X)\n", data, address, whoName[who], m68k_get_reg(NULL, M68K_REG_PC));
 477         extern bool finished;
 478         finished = true;
 479         extern bool doDSPDis;
 480         if (who == DSP)
 481                 doDSPDis = true;
 482 #endif
 483 }
 484
 485 unsigned jaguar_unknown_readbyte(unsigned address, uint32 who/*=UNKNOWN*/)
 486 {
 487 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 488         WriteLog("Jaguar: Unknown byte read at %08X by %s (M68K PC=%06X)\n", address, whoName[who], m68k_get_reg(NULL, M68K_REG_PC));
 489         extern bool finished;
 490         finished = true;
 491         extern bool doDSPDis;
 492         if (who == DSP)
 493                 doDSPDis = true;
 494 #endif
 495     return 0xFF;
 496 }
 497
 498 unsigned jaguar_unknown_readword(unsigned address, uint32 who/*=UNKNOWN*/)
 499 {
 500 #ifdef LOG_UNMAPPED_MEMORY_ACCESSES
 501         WriteLog("Jaguar: Unknown word read at %08X by %s (M68K PC=%06X)\n", address, whoName[who], m68k_get_reg(NULL, M68K_REG_PC));
 502         extern bool finished;
 503         finished = true;
 504         extern bool doDSPDis;
 505         if (who == DSP)
 506                 doDSPDis = true;
 507 #endif
 508     return 0xFFFF;
 509 }
 510
 511 //
 512 // Disassemble M68K instructions at the given offset
 513 //
 514
 515 unsigned int m68k_read_disassembler_8(unsigned int address)
 516 {
 517         return m68k_read_memory_8(address);
 518 }
 519
 520 unsigned int m68k_read_disassembler_16(unsigned int address)
 521 {
 522         return m68k_read_memory_16(address);
 523 }
 524
 525 unsigned int m68k_read_disassembler_32(unsigned int address)
 526 {
 527         return m68k_read_memory_32(address);
 528 }
 529
 530 void jaguar_dasm(uint32 offset, uint32 qt)
 531 {
 532 #ifdef CPU_DEBUG
 533         static char buffer[2048];//, mem[64];
 534         int pc = offset, oldpc;
 535
 536         for(uint32 i=0; i<qt; i++)
 537         {
 538 /*              oldpc = pc;
 539                 for(int j=0; j<64; j++)
 540                         mem[j^0x01] = jaguar_byte_read(pc + j);
 541
 542                 pc += Dasm68000((char *)mem, buffer, 0);
 543                 WriteLog("%08X: %s\n", oldpc, buffer);//*/
 544                 oldpc = pc;
 545                 pc += m68k_disassemble(buffer, pc, M68K_CPU_TYPE_68000);
 546                 WriteLog("%08X: %s\n", oldpc, buffer);//*/
 547         }
 548 #endif
 549 }
 550
 551 uint8 JaguarReadByte(uint32 offset, uint32 who/*=UNKNOWN*/)
 552 {
 553         uint8 data = 0x00;
 554
 555         offset &= 0xFFFFFF;
 556         if (offset < 0x400000)
 557                 data = jaguar_mainRam[offset & 0x3FFFFF];
 558         else if ((offset >= 0x800000) && (offset < 0xC00000))
 559                 data = jaguar_mainRom[offset - 0x800000];
 560         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFF))
 561                 data = CDROMReadByte(offset, who);
 562         else if ((offset >= 0xE00000) && (offset < 0xE40000))
 563                 data = jaguar_bootRom[offset & 0x3FFFF];
 564         else if ((offset >= 0xF00000) && (offset < 0xF10000))
 565                 data = TOMReadByte(offset, who);
 566         else if ((offset >= 0xF10000) && (offset < 0xF20000))
 567                 data = JERRYReadByte(offset, who);
 568         else
 569                 data = jaguar_unknown_readbyte(offset, who);
 570
 571         return data;
 572 }
 573
 574 uint16 JaguarReadWord(uint32 offset, uint32 who/*=UNKNOWN*/)
 575 {
 576         offset &= 0xFFFFFF;
 577         if (offset <= 0x3FFFFE)
 578         {
 579                 return (jaguar_mainRam[(offset+0) & 0x3FFFFF] << 8) | jaguar_mainRam[(offset+1) & 0x3FFFFF];
 580         }
 581         else if ((offset >= 0x800000) && (offset <= 0xBFFFFE))
 582         {
 583                 offset -= 0x800000;
 584                 return (jaguar_mainRom[offset+0] << 8) | jaguar_mainRom[offset+1];
 585         }
 586 //      else if ((offset >= 0xDFFF00) && (offset < 0xDFFF00))
 587         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFE))
 588                 return CDROMReadWord(offset, who);
 589         else if ((offset >= 0xE00000) && (offset <= 0xE3FFFE))
 590                 return (jaguar_bootRom[(offset+0) & 0x3FFFF] << 8) | jaguar_bootRom[(offset+1) & 0x3FFFF];
 591         else if ((offset >= 0xF00000) && (offset <= 0xF0FFFE))
 592                 return TOMReadWord(offset, who);
 593         else if ((offset >= 0xF10000) && (offset <= 0xF1FFFE))
 594                 return JERRYReadWord(offset, who);
 595
 596         return jaguar_unknown_readword(offset, who);
 597 }
 598
 599 void JaguarWriteByte(uint32 offset, uint8 data, uint32 who/*=UNKNOWN*/)
 600 {
 601         offset &= 0xFFFFFF;
 602         if (offset < 0x400000)
 603         {
 604                 jaguar_mainRam[offset & 0x3FFFFF] = data;
 605                 return;
 606         }
 607         else if ((offset >= 0xDFFF00) && (offset <= 0xDFFFFF))
 608         {
 609                 CDROMWriteByte(offset, data, who);
 610                 return;
 611         }
 612         else if ((offset >= 0xF00000) && (offset <= 0xF0FFFF))
 613         {
 614                 TOMWriteByte(offset, data, who);
 615                 return;
 616         }
 617         else if ((offset >= 0xF10000) && (offset <= 0xF1FFFF))
 618         {
 619                 JERRYWriteByte(offset, data, who);
 620                 return;
 621         }
 622
 623         jaguar_unknown_writebyte(offset, data, who);
 624 }
 625
 626 void JaguarWriteWord(uint32 offset, uint16 data, uint32 who/*=UNKNOWN*/)
 627 {
 628 //TEMP--Mirror of F03000? Yes, but only 32-bit CPUs can do it (i.e., NOT the 68K!)
 629 // PLUS, you would handle this in the GPU/DSP WriteLong code! Not here!
 630         offset &= 0xFFFFFF;
 631
 632         if (offset <= 0x3FFFFE)
 633         {
 634 //This MUST be done by the 68K!
 635 /*if (offset == 0x670C)
 636         WriteLog("Jaguar: %s writing to location $670C...\n", whoName[who]);*/
 637
 638                 jaguar_mainRam[(offset+0) & 0x3FFFFF] = (data>>8) & 0xFF;
 639                 jaguar_mainRam[(offset+1) & 0x3FFFFF] = data & 0xFF;
 640                 return;
 641         }
 642         else if (offset >= 0xDFFF00 && offset <= 0xDFFFFE)
 643         {
 644                 CDROMWriteWord(offset, data, who);
 645                 return;
 646         }
 647         else if (offset >= 0xF00000 && offset <= 0xF0FFFE)
 648         {
 649                 TOMWriteWord(offset, data, who);
 650                 return;
 651         }
 652         else if (offset >= 0xF10000 && offset <= 0xF1FFFE)
 653         {
 654                 JERRYWriteWord(offset, data, who);
 655                 return;
 656         }
 657         // Don't bomb on attempts to write to ROM
 658         else if (offset >= 0x800000 && offset <= 0xEFFFFF)
 659                 return;
 660
 661         jaguar_unknown_writeword(offset, data, who);
 662 }
 663
 664 // We really should re-do this so that it does *real* 32-bit access... !!! FIX !!!
 665 uint32 JaguarReadLong(uint32 offset, uint32 who/*=UNKNOWN*/)
 666 {
 667         return (JaguarReadWord(offset, who) << 16) | JaguarReadWord(offset+2, who);
 668 }
 669
 670 // We really should re-do this so that it does *real* 32-bit access... !!! FIX !!!
 671 void JaguarWriteLong(uint32 offset, uint32 data, uint32 who/*=UNKNOWN*/)
 672 {
 673 /*      extern bool doDSPDis;
 674         if (offset < 0x400 && !doDSPDis)
 675         {
 676                 WriteLog("JLW: Write to %08X by %s... Starting DSP log!\n\n", offset, whoName[who]);
 677                 doDSPDis = true;
 678         }//*/
 679
 680         JaguarWriteWord(offset, data >> 16, who);
 681         JaguarWriteWord(offset+2, data & 0xFFFF, who);
 682 }
 683
 684 //
 685 // Jaguar console initialization
 686 //
 687 void jaguar_init(void)
 688 {
 689 #ifdef CPU_DEBUG_MEMORY
 690         memset(readMem, 0x00, 0x400000);
 691         memset(writeMemMin, 0xFF, 0x400000);
 692         memset(writeMemMax, 0x00, 0x400000);
 693 #endif
 694         memory_malloc_secure((void **)&jaguar_mainRam, 0x400000, "Jaguar 68K CPU RAM");
 695         memory_malloc_secure((void **)&jaguar_bootRom, 0x040000, "Jaguar 68K CPU BIOS ROM");
 696         memory_malloc_secure((void **)&jaguar_mainRom, 0x600000, "Jaguar 68K CPU ROM");
 697         memset(jaguar_mainRam, 0x00, 0x400000);
 698 //      memset(jaguar_mainRom, 0xFF, 0x200000); // & set it to all Fs...
 699 //      memset(jaguar_mainRom, 0x00, 0x200000); // & set it to all 0s...
 700 //NOTE: This *doesn't* fix FlipOut...
 701         memset(jaguar_mainRom, 0x01, 0x600000); // & set it to all 01s...
 702
 703 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\Brain Dead 13.cdi");
 704 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\baldies.cdi");
 705 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\mystdemo.cdi");
 706 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\battlemorph.cdi");
 707 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\primalrage.cdi");
 708 //      cd_bios_boot("C:\\ftp\\jaguar\\cd\\Dragons Lair.cdi");
 709
 710         m68k_set_cpu_type(M68K_CPU_TYPE_68000);
 711         gpu_init();
 712         DSPInit();
 713         tom_init();
 714         jerry_init();
 715         cdrom_init();
 716 }
 717
 718 void jaguar_done(void)
 719 {
 720 #ifdef CPU_DEBUG_MEMORY
 721 /*      WriteLog("\n\nM68000 disassembly at $8D0D44 (collision routine!)...\n");
 722         jaguar_dasm(0x8D0D44, 5000);
 723         WriteLog("\n");//*/
 724 /*      WriteLog("\n\nM68000 disassembly at $806300 (look @ $806410)...\n");
 725         jaguar_dasm(0x806300, 5000);
 726         WriteLog("\n");//*/
 727
 728 /*      WriteLog("\nJaguar: Memory Usage Stats (return addresses)\n\n");
 729
 730         for(uint32 i=0; i<=raPtr; i++)
 731         {
 732                 WriteLog("\t%08X\n", returnAddr[i]);
 733                 WriteLog("M68000 disassembly at $%08X...\n", returnAddr[i] - 16);
 734                 jaguar_dasm(returnAddr[i] - 16, 16);
 735                 WriteLog("\n");
 736         }
 737         WriteLog("\n");//*/
 738
 739 /*      int start = 0, end = 0;
 740         bool endTriggered = false, startTriggered = false;
 741         for(int i=0; i<0x400000; i++)
 742         {
 743                 if (readMem[i] && writeMemMin[i] != 0xFF && writeMemMax != 0x00)
 744                 {
 745                         if (!startTriggered)
 746                                 startTriggered = true, endTriggered = false, start = i;
 747
 748                         WriteLog("\t\tMin/Max @ %06X: %u/%u\n", i, writeMemMin[i], writeMemMax[i]);
 749                 }
 750                 else
 751                 {
 752                         if (!endTriggered)
 753                         {
 754                                 end = i - 1, endTriggered = true, startTriggered = false;
 755                                 WriteLog("\tMemory range accessed: %06X - %06X\n", start, end);
 756                         }
 757                 }
 758         }
 759         WriteLog("\n");//*/
 760 #endif
 761 //#ifdef CPU_DEBUG
 762 //      for(int i=M68K_REG_A0; i<=M68K_REG_A7; i++)
 763 //              WriteLog("\tA%i = 0x%.8x\n", i-M68K_REG_A0, m68k_get_reg(NULL, (m68k_register_t)i));
 764         int32 topOfStack = m68k_get_reg(NULL, M68K_REG_A7);
 765         WriteLog("M68K: Top of stack: %08X. Stack trace:\n", JaguarReadLong(topOfStack));
 766         for(int i=-2; i<9; i++)
 767                 WriteLog("%06X: %08X\n", topOfStack + (i * 4), JaguarReadLong(topOfStack + (i * 4)));
 768
 769 /*      WriteLog("\nM68000 disassembly at $802288...\n");
 770         jaguar_dasm(0x802288, 3);
 771         WriteLog("\nM68000 disassembly at $802200...\n");
 772         jaguar_dasm(0x802200, 500);
 773         WriteLog("\nM68000 disassembly at $802518...\n");
 774         jaguar_dasm(0x802518, 100);//*/
 775
 776 /*      WriteLog("\n\nM68000 disassembly at $803F00 (look @ $803F2A)...\n");
 777         jaguar_dasm(0x803F00, 500);
 778         WriteLog("\n");//*/
 779
 780 /*      WriteLog("\n\nM68000 disassembly at $802B00 (look @ $802B5E)...\n");
 781         jaguar_dasm(0x802B00, 500);
 782         WriteLog("\n");//*/
 783
 784 /*      WriteLog("\n\nM68000 disassembly at $809900 (look @ $8099F8)...\n");
 785         jaguar_dasm(0x809900, 500);
 786         WriteLog("\n");//*/
 787 //8099F8
 788 /*      WriteLog("\n\nDump of $8093C8:\n\n");
 789         for(int i=0x8093C8; i<0x809900; i+=4)
 790                 WriteLog("%06X: %08X\n", i, JaguarReadLong(i));//*/
 791 /*      WriteLog("\n\nM68000 disassembly at $90006C...\n");
 792         jaguar_dasm(0x90006C, 500);
 793         WriteLog("\n");//*/
 794
 795 //      WriteLog("Jaguar: CD BIOS version %04X\n", JaguarReadWord(0x3004));
 796         WriteLog("Jaguar: Interrupt enable = %02X\n", TOMReadByte(0xF000E1) & 0x1F);
 797         WriteLog("Jaguar: VBL interrupt is %s\n", ((tom_irq_enabled(IRQ_VBLANK)) && (jaguar_interrupt_handler_is_valid(64))) ? "enabled" : "disabled");
 798         M68K_show_context();
 799 //#endif
 800
 801         cd_bios_done();
 802         cdrom_done();
 803         gpu_done();
 804         DSPDone();
 805         tom_done();
 806         jerry_done();
 807
 808         memory_free(jaguar_mainRom);
 809         memory_free(jaguar_bootRom);
 810         memory_free(jaguar_mainRam);
 811 }
 812
 813 void jaguar_reset(void)
 814 {
 815         if (vjs.useJaguarBIOS)
 816                 memcpy(jaguar_mainRam, jaguar_bootRom, 8);
 817         else
 818         {
 819                 SET32(jaguar_mainRam, 4, 0x00802000);
 820                 // Handle PD stuff...
 821                 // This should definitely go elsewhere (like in the cart load section)!
 822                 if (jaguar_mainRom[0] == 0x60 && jaguar_mainRom[1] == 0x1A)
 823                 {
 824                         uint32 runAddress = GET32(jaguar_mainRom, 0x2A);
 825                         uint32 progLength = GET32(jaguar_mainRom, 0x02);
 826                         WriteLog("Setting up PD ROM... Run address: %08X, length: %08X\n", runAddress, progLength);
 827                         memcpy(jaguar_mainRam + runAddress, jaguar_mainRom + 0x2E, progLength);
 828                         SET32(jaguar_mainRam, 4, runAddress);
 829                 }
 830         }
 831
 832 //      WriteLog("jaguar_reset():\n");
 833 //#ifdef SOUND_OUTPUT
 834 //      ws_audio_reset();
 835 //#endif
 836         cd_bios_reset();
 837         tom_reset();
 838         jerry_reset();
 839         gpu_reset();
 840         DSPReset();
 841         cdrom_reset();
 842     m68k_pulse_reset();                         // Reset the 68000
 843         WriteLog("\t68K PC=%06X SP=%08X\n", m68k_get_reg(NULL, M68K_REG_PC), m68k_get_reg(NULL, M68K_REG_A7));
 844 }
 845
 846 //
 847 // Main Jaguar execution loop (1 frame)
 848 //
 849 void JaguarExecute(int16 * backbuffer, bool render)
 850 {
 851         uint16 vp = TOMReadWord(0xF0003E) + 1;//Hmm. This is a WO register. Will work? Looks like. But wrong behavior!
 852         uint16 vi = TOMReadWord(0xF0004E);//Another WO register...
 853 //      uint16 vdb = TOMReadWord(0xF00046);
 854 //Note: This is the *definite* end of the display, though VDE *might* be less than this...
 855 //      uint16 vbb = TOMReadWord(0xF00040);
 856 //It seems that they mean it when they say that VDE is the end of object processing.
 857 //However, we need to be able to tell the OP (or TOM) that we've reached the end of the
 858 //buffer and not to write any more pixels... !!! FIX !!!
 859 //      uint16 vde = TOMReadWord(0xF00048);
 860
 861         uint16 refreshRate = (vjs.hardwareTypeNTSC ? 60 : 50);
 862         // Should these be hardwired or read from VP? Yes, from VP!
 863         uint32 M68KCyclesPerScanline
 864                 = (vjs.hardwareTypeNTSC ? M68K_CLOCK_RATE_NTSC : M68K_CLOCK_RATE_PAL) / (vp * refreshRate);
 865         uint32 RISCCyclesPerScanline
 866                 = (vjs.hardwareTypeNTSC ? RISC_CLOCK_RATE_NTSC : RISC_CLOCK_RATE_PAL) / (vp * refreshRate);
 867
 868         TOMResetBackbuffer(backbuffer);
 869 /*extern int effect_start;
 870 if (effect_start)
 871 {
 872         WriteLog("JagExe: VP=%u, VI=%u, VDB=%u, VBB=%u CPU CPS=%u, GPU CPS=%u\n", vp, vi, vdb, vbb, M68KCyclesPerScanline, RISCCyclesPerScanline);
 873 }//*/
 874
 875         for(uint16 i=0; i<vp; i++)
 876         {
 877                 // Increment the horizontal count (why? RNG?)
 878                 TOMWriteWord(0xF00004, (TOMReadWord(0xF00004) + 1) & 0x7FF);
 879
 880                 TOMWriteWord(0xF00006, i);                                      // Write the VC
 881
 882                 if (i == vi)                                                            // Time for Vertical Interrupt?
 883                 {
 884                         if (tom_irq_enabled(IRQ_VBLANK))// && jaguar_interrupt_handler_is_valid(64))
 885                         {
 886                                 // We don't have to worry about autovectors & whatnot because the Jaguar
 887                                 // tells you through its HW registers who sent the interrupt...
 888                                 tom_set_pending_video_int();
 889                                 m68k_set_irq(7);
 890                         }
 891                 }
 892
 893 //              uint32 invalid_instruction_address = s68000exec(M68KCyclesPerScanline);
 894 //              if (invalid_instruction_address != 0x80000000)
 895 //                      cd_bios_process(invalid_instruction_address);
 896                 m68k_execute(M68KCyclesPerScanline);
 897                 // No CD handling... !!! FIX !!!
 898                 cd_bios_exec(i);        // NOTE: Ignores parameter...
 899                 TOMExecPIT(RISCCyclesPerScanline);
 900                 jerry_pit_exec(RISCCyclesPerScanline);
 901                 jerry_i2s_exec(RISCCyclesPerScanline);
 902                 gpu_exec(RISCCyclesPerScanline);
 903
 904                 if (vjs.DSPEnabled)
 905                         if (vjs.usePipelinedDSP)
 906                                 DSPExecP2(RISCCyclesPerScanline);       // Pipelined DSP execution (3 stage)...
 907                         else
 908                                 DSPExec(RISCCyclesPerScanline);         // Ordinary non-pipelined DSP
 909 //                      DSPExecComp(RISCCyclesPerScanline);             // Comparison core
 910
 911                 TOMExecScanline(i, render);
 912         }
 913 }
 914
 915 // Temp debugging stuff
 916
 917 void DumpMainMemory(void)
 918 {
 919         FILE * fp = fopen("./memdump.bin", "wb");
 920
 921         if (fp == NULL)
 922                 return;
 923
 924         fwrite(jaguar_mainRam, 1, 0x400000, fp);
 925         fclose(fp);
 926 }
 927
 928 uint8 * GetRamPtr(void)
 929 {
 930         return jaguar_mainRam;
 931 }