1 // This is part of Pico Library
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3 // (c) Copyright 2004 Dave, All rights reserved.
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4 // (c) Copyright 2006 notaz, All rights reserved.
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5 // Free for non-commercial use.
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7 // For commercial use, separate licencing terms must be obtained.
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10 #include "PicoInt.h"
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13 int SekCycleCnt=0; // cycles done in this frame
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14 int SekCycleAim=0; // cycle aim
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15 unsigned int SekCycleCntT=0;
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21 struct Cyclone PicoCpuCM68k;
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25 m68ki_cpu_core PicoCpuMM68k;
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29 M68K_CONTEXT PicoCpuFM68k;
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35 // interrupt acknowledgment
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36 static int SekIntAck(int level)
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38 // try to emulate VDP's reaction to 68000 int ack
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39 if (level == 4) { Pico.video.pending_ints = 0; elprintf(EL_INTS, "hack: @ %06x [%i]", SekPc, SekCycleCnt); }
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40 else if(level == 6) { Pico.video.pending_ints &= ~0x20; elprintf(EL_INTS, "vack: @ %06x [%i]", SekPc, SekCycleCnt); }
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41 PicoCpuCM68k.irq = 0;
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42 return CYCLONE_INT_ACK_AUTOVECTOR;
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45 static void SekResetAck(void)
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47 elprintf(EL_ANOMALY, "Reset encountered @ %06x", SekPc);
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50 static int SekUnrecognizedOpcode()
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52 unsigned int pc, op;
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54 op = PicoCpuCM68k.read16(pc);
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55 elprintf(EL_ANOMALY, "Unrecognized Opcode %04x @ %06x", op, pc);
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56 // see if we are not executing trash
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57 if (pc < 0x200 || (pc > Pico.romsize+4 && (pc&0xe00000)!=0xe00000)) {
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58 PicoCpuCM68k.cycles = 0;
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59 PicoCpuCM68k.state_flags |= 1;
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62 #ifdef EMU_M68K // debugging cyclone
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64 extern int have_illegal;
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74 static int SekIntAckM68K(int level)
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76 if (level == 4) { Pico.video.pending_ints = 0; elprintf(EL_INTS, "hack: @ %06x [%i]", SekPc, SekCycleCnt); }
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77 else if(level == 6) { Pico.video.pending_ints &= ~0x20; elprintf(EL_INTS, "vack: @ %06x [%i]", SekPc, SekCycleCnt); }
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79 return M68K_INT_ACK_AUTOVECTOR;
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82 static int SekTasCallback(void)
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84 return 0; // no writeback
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90 static void SekIntAckF68K(unsigned level)
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92 if (level == 4) { Pico.video.pending_ints = 0; elprintf(EL_INTS, "hack: @ %06x [%i]", SekPc, SekCycleCnt); }
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93 else if(level == 6) { Pico.video.pending_ints &= ~0x20; elprintf(EL_INTS, "vack: @ %06x [%i]", SekPc, SekCycleCnt); }
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94 PicoCpuFM68k.interrupts[0] = 0;
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99 PICO_INTERNAL int SekInit()
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103 memset(&PicoCpuCM68k,0,sizeof(PicoCpuCM68k));
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104 PicoCpuCM68k.IrqCallback=SekIntAck;
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105 PicoCpuCM68k.ResetCallback=SekResetAck;
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106 PicoCpuCM68k.UnrecognizedCallback=SekUnrecognizedOpcode;
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107 PicoCpuCM68k.flags=4; // Z set
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111 void *oldcontext = m68ki_cpu_p;
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112 m68k_set_context(&PicoCpuMM68k);
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113 m68k_set_cpu_type(M68K_CPU_TYPE_68000);
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115 m68k_set_int_ack_callback(SekIntAckM68K);
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116 m68k_set_tas_instr_callback(SekTasCallback);
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117 //m68k_pulse_reset();
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118 m68k_set_context(oldcontext);
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123 void *oldcontext = g_m68kcontext;
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124 g_m68kcontext = &PicoCpuFM68k;
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125 memset(&PicoCpuFM68k, 0, sizeof(PicoCpuFM68k));
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127 PicoCpuFM68k.iack_handler = SekIntAckF68K;
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128 PicoCpuFM68k.sr = 0x2704; // Z flag
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129 g_m68kcontext = oldcontext;
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137 // Reset the 68000:
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138 PICO_INTERNAL int SekReset()
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140 if (Pico.rom==NULL) return 1;
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143 PicoCpuCM68k.state_flags=0;
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144 PicoCpuCM68k.osp=0;
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145 PicoCpuCM68k.srh =0x27; // Supervisor mode
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146 PicoCpuCM68k.irq=0;
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147 PicoCpuCM68k.a[7]=PicoCpuCM68k.read32(0); // Stack Pointer
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148 PicoCpuCM68k.membase=0;
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149 PicoCpuCM68k.pc=PicoCpuCM68k.checkpc(PicoCpuCM68k.read32(4)); // Program Counter
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152 m68k_set_context(&PicoCpuMM68k); // if we ever reset m68k, we always need it's context to be set
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155 m68k_pulse_reset();
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160 g_m68kcontext = &PicoCpuFM68k;
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169 // data must be word aligned
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170 PICO_INTERNAL void SekState(int *data)
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173 memcpy32(data,(int *)PicoCpuCM68k.d,0x44/4);
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174 data[0x11] = PicoCpuCM68k.flags;
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175 #elif defined(EMU_M68K)
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176 memcpy32(data, (int *)PicoCpuMM68k.dar, 0x40/4);
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177 data[0x10] = PicoCpuMM68k.pc;
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178 data[0x11] = m68k_get_reg(&PicoCpuMM68k, M68K_REG_SR);
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179 #elif defined(EMU_F68K)
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180 memcpy32(data, (int *)PicoCpuFM68k.dreg, 0x40/4);
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181 data[0x10] = PicoCpuFM68k.pc;
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182 data[0x11] = PicoCpuFM68k.sr;
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186 PICO_INTERNAL void SekSetRealTAS(int use_real)
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189 CycloneSetRealTAS(use_real);
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196 /* idle loop detection, not to be used in CD mode */
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198 #include "cpu/Cyclone/tools/idle.h"
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201 static int *idledet_addrs = NULL;
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202 static int idledet_count = 0, idledet_bads = 0;
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203 int idledet_start_frame = 0;
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205 static unsigned char *rom_verify = NULL;
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207 void SekInitIdleDet(void)
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209 void *tmp = realloc(idledet_addrs, 0x200*4);
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211 free(idledet_addrs);
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212 idledet_addrs = NULL;
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215 idledet_addrs = tmp;
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216 idledet_count = idledet_bads = 0;
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217 idledet_start_frame = Pico.m.frame_count + 360;
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219 rom_verify = realloc(rom_verify, Pico.romsize);
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220 memcpy(rom_verify, Pico.rom, Pico.romsize);
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226 int SekIsIdleCode(unsigned short *dst, int bytes)
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228 printf("SekIsIdleCode %04x %i\n", *dst, bytes);
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232 if ( (*dst & 0xfff8) == 0x4a10 || // tst.b ($aX) // where should be no need to wait
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233 (*dst & 0xfff8) == 0x4a28 || // tst.b ($xxxx,a0) // for byte change anywhere
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234 (*dst & 0xff3f) == 0x4a38 || // tst.x ($xxxx.w), tas ($xxxx.w)
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235 (*dst & 0xc1ff) == 0x0038 || // move.x ($xxxx.w), dX
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236 (*dst & 0xf13f) == 0xb038) // cmp.x ($xxxx.w), dX
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240 if ( ((dst[1] & 0xe0) == 0xe0 && ( // RAM
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241 *dst == 0x4a39 || // tst.b ($xxxxxxxx)
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242 *dst == 0x4a79 || // tst.w ($xxxxxxxx)
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243 *dst == 0x4ab9)) || // tst.l ($xxxxxxxx)
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244 *dst == 0x0838) // btst $X, ($xxxx.w) [6 byte op]
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248 if ( (dst[2] & 0xe0) == 0xe0 && ( // RAM
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249 *dst == 0x0839 || // btst $X, ($xxxxxxxx.w) [8 byte op]
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250 (*dst & 0xffbf) == 0x0c39)) // cmpi.{b,w} $X, ($xxxxxxxx)
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254 if ((*dst & 0xf1f8) == 0x3010 && // move.w (aX), dX
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255 (dst[1]&0xf100) == 0x0000 && // arithmetic
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256 (dst[3]&0xf100) == 0x0000) // arithmetic
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264 int SekRegisterIdlePatch(unsigned int pc, int oldop, int newop)
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267 pc -= PicoCpuCM68k.membase;
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270 elprintf(EL_IDLE, "idle: patch %06x %04x %04x #%i", pc, oldop, newop, idledet_count);
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271 if (pc > Pico.romsize) {
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272 if (++idledet_bads > 128) return 2; // remove detector
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273 return 1; // don't patch
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276 if (idledet_count >= 0x200 && (idledet_count & 0x1ff) == 0) {
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277 void *tmp = realloc(idledet_addrs, (idledet_count+0x200)*4);
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278 if (tmp == NULL) return 1;
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279 idledet_addrs = tmp;
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282 idledet_addrs[idledet_count++] = pc;
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286 void SekFinishIdleDet(void)
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288 int done_something = idledet_count > 0;
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290 CycloneFinishIdle();
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292 while (idledet_count > 0)
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294 unsigned short *op = (unsigned short *)&Pico.rom[idledet_addrs[--idledet_count]];
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295 if ((*op & 0xfd00) == 0x7100)
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296 *op &= 0xff, *op |= 0x6600;
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297 else if ((*op & 0xfd00) == 0x7500)
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298 *op &= 0xff, *op |= 0x6700;
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299 else if ((*op & 0xfd00) == 0x7d00)
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300 *op &= 0xff, *op |= 0x6000;
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302 elprintf(EL_STATUS|EL_IDLE, "idle: don't know how to restore %04x", *op);
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305 if (done_something)
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308 for (i = 0; i < Pico.romsize; i++)
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309 if (rom_verify[i] != Pico.rom[i])
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310 printf("ROM corruption @ %06x!\n", i), exit(1);
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315 #if defined(EMU_M68K) && M68K_INSTRUCTION_HOOK == OPT_SPECIFY_HANDLER
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316 static unsigned char op_flags[0x400000/2] = { 0, };
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317 static int atexit_set = 0;
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319 static void make_idc(void)
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321 FILE *f = fopen("idc.idc", "w");
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324 fprintf(f, "#include <idc.idc>\nstatic main() {\n");
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325 for (i = 0; i < 0x400000/2; i++)
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326 if (op_flags[i] != 0)
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327 fprintf(f, " MakeCode(0x%06x);\n", i*2);
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332 void instruction_hook(void)
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338 if (REG_PC < 0x400000)
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339 op_flags[REG_PC/2] = 1;
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