git.maemo.org Git - drnoksnes/blob - os9x_asm_cpu.cpp

   1 #include "snes9x.h"
   2 #include "apu.h"
   3 #include "ppu.h"
   4 #include "cpuexec.h"
   5 //#include "cpuops.h"
   6
   7 #include "os9x_asm_cpu.h"
   8
   9 //#define __debug_c_irq__
  10 //#define __debug_c_nmi__
  11 //#define __debug_c_hblank__
  12 //#define __debug_c_io__
  13
  14 START_EXTERN_C
  15
  16 void asm_S9xSetPCBase(uint32 Address)
  17 {
  18 #ifdef __debug_c_setpc__
  19         printf("spcb\n");
  20 #endif
  21         S9xSetPCBase(Address);
  22 }
  23
  24
  25 #if 0
  26 #define PushW(w) \
  27     S9xSetWord (w, Registers.S.W - 1);\
  28     Registers.S.W -= 2;
  29 #define PushB(b)\
  30     S9xSetByte (b, Registers.S.W--);
  31
  32
  33 void asm_S9xMainLoop(void)
  34 {
  35         //S9xPackStatus();
  36         //printf("asmMainLoop Enter(0x%08x).\n", CPU.Flags);
  37         asmMainLoop(&CPU);
  38         //printf("asmMainLoop Exit(0x%08x, %d).\n", CPU.PC - CPU.PCBase, CPU.Cycles);
  39         //S9xUnpackStatus();
  40 }
  41
  42 void asm_S9xDoHBlankProcessing(void)
  43 {
  44 #ifdef __debug_c_hblank__
  45         printf("hblank\n");
  46 #endif
  47 //      S9xUnpackStatus(); // not needed
  48         S9xDoHBlankProcessing();
  49 //      S9xPackStatus();
  50 }
  51
  52
  53 uint8 asm_S9xGetByte(uint32 Address)
  54 {
  55 #ifdef __debug_c_io__
  56         printf("gb\n");
  57 #endif
  58         return S9xGetByte(Address);
  59 }
  60
  61 uint16 asm_S9xGetWord(uint32 Address)
  62 {
  63 #ifdef __debug_c_io__
  64         printf("gw\n");
  65 #endif
  66         return S9xGetWord(Address);
  67 }
  68
  69
  70 void asm_S9xSetByte(uint32 Address,uint8 value)
  71 {
  72 #ifdef __debug_c_io__
  73         printf("sb\n");
  74 #endif
  75         S9xSetByte(value,Address);
  76 }
  77
  78 void asm_S9xSetWord(uint32 Address,uint16 value)
  79 {
  80 #ifdef __debug_c_io__
  81         printf("sw\n");
  82 #endif
  83         S9xSetWord(value,Address);
  84 }
  85
  86
  87 void asm_S9xOpcode_NMI(void)
  88 {
  89 #ifdef __debug_c_nmi__
  90         printf("nmi\n");
  91 #endif
  92 //      S9xUnpackStatus(); // not needed
  93
  94         if (!CheckEmulation())
  95     {
  96         PushB (Registers.PB);
  97         PushW (CPU.PC - CPU.PCBase);
  98 //      S9xPackStatus ();
  99         PushB (Registers.PL);
 100         ClearDecimal ();
 101         SetIRQ ();
 102
 103         Registers.PB = 0;
 104 //      c = 0; // unused
 105 #ifdef USE_SA1
 106         if (Settings.SA1 && (Memory.FillRAM [0x2209] & 0x20))
 107             S9xSetPCBase (Memory.FillRAM [0x220c] |
 108                           (Memory.FillRAM [0x220d] << 8));
 109         else
 110 #endif
 111                 S9xSetPCBase (S9xGetWord (0xFFEA));
 112 #ifdef VAR_CYCLES
 113         CPU.Cycles += TWO_CYCLES;
 114 #else
 115         CPU.Cycles += 8;
 116 #endif
 117     }
 118     else
 119     {
 120         PushW (CPU.PC - CPU.PCBase);
 121 //      S9xPackStatus (); // not needed
 122         PushB (Registers.PL);
 123         ClearDecimal ();
 124         SetIRQ ();
 125
 126         Registers.PB = 0;
 127 //      ICPU.ShiftedPB = 0; // unused
 128 #ifdef USE_SA1
 129         if (Settings.SA1 && (Memory.FillRAM [0x2209] & 0x20))
 130             S9xSetPCBase (Memory.FillRAM [0x220c] |
 131                           (Memory.FillRAM [0x220d] << 8));
 132         else
 133 #endif
 134             S9xSetPCBase (S9xGetWord (0xFFFA));
 135 #ifdef VAR_CYCLES
 136         CPU.Cycles += ONE_CYCLE;
 137 #else
 138         CPU.Cycles += 6;
 139 #endif
 140     }
 141
 142 //      S9xPackStatus(); // not needed
 143 }
 144
 145 void asm_S9xOpcode_IRQ(void)
 146 {
 147 #ifdef __debug_c_irq__
 148         printf("irq\n");
 149 #endif
 150 //      S9xUnpackStatus(); // not needed
 151
 152     if (!CheckEmulation())
 153     {
 154         PushB (Registers.PB);
 155         PushW (CPU.PC - CPU.PCBase);
 156 //      S9xPackStatus (); // not needed
 157         PushB (Registers.PL);
 158         ClearDecimal ();
 159         SetIRQ ();
 160
 161         Registers.PB = 0;
 162 //      ICPU.ShiftedPB = 0; // unused
 163
 164 #ifdef USE_SA1
 165         if (Settings.SA1 && (Memory.FillRAM [0x2209] & 0x40))
 166             S9xSetPCBase (Memory.FillRAM [0x220e] |
 167                           (Memory.FillRAM [0x220f] << 8));
 168         else
 169 #endif
 170                 S9xSetPCBase (S9xGetWord (0xFFEE));
 171 #ifdef VAR_CYCLES
 172         CPU.Cycles += TWO_CYCLES;
 173 #else
 174         CPU.Cycles += 8;
 175 #endif
 176     }
 177     else
 178     {
 179         PushW (CPU.PC - CPU.PCBase);
 180 //      S9xPackStatus (); // not needed
 181         PushB (Registers.PL);
 182         ClearDecimal ();
 183         SetIRQ ();
 184
 185         Registers.PB = 0;
 186 //      ICPU.ShiftedPB = 0; // unused
 187
 188 #ifdef USE_SA1
 189         if (Settings.SA1 && (Memory.FillRAM [0x2209] & 0x40))
 190             S9xSetPCBase (Memory.FillRAM [0x220e] |
 191                           (Memory.FillRAM [0x220f] << 8));
 192         else
 193 #endif
 194                 S9xSetPCBase (S9xGetWord (0xFFFE));
 195 #ifdef VAR_CYCLES
 196         CPU.Cycles += ONE_CYCLE;
 197 #else
 198         CPU.Cycles += 6;
 199 #endif
 200     }
 201
 202 //      S9xPackStatus(); // not needed
 203 }
 204 #endif
 205
 206
 207 #ifndef ASM_SPC700
 208
 209 void asm_APU_EXECUTE(void)
 210 {
 211 #ifdef __debug_c_apuex__
 212         printf("apuexec\n");
 213 #endif
 214         if(CPU.APU_APUExecuting != 1) return;
 215
 216         while (CPU.APU_Cycles <= CPU.Cycles)
 217         {
 218                 APU_EXECUTE1();
 219         }
 220 }
 221
 222 void asm_APU_EXECUTE2(void)
 223 {
 224         if(CPU.APU_APUExecuting != 1) return;
 225
 226         ICPU.CPUExecuting = FALSE;
 227         do
 228         {
 229             APU_EXECUTE1();
 230         } while (CPU.APU_Cycles < CPU.NextEvent);
 231         ICPU.CPUExecuting = TRUE;
 232 }
 233
 234 #endif
 235
 236 END_EXTERN_C