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 "pico_int.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 void SekInit(void)
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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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135 // Reset the 68000:
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136 PICO_INTERNAL int SekReset(void)
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138 if (Pico.rom==NULL) return 1;
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141 CycloneReset(&PicoCpuCM68k);
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144 m68k_set_context(&PicoCpuMM68k); // if we ever reset m68k, we always need it's context to be set
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147 m68k_pulse_reset();
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152 g_m68kcontext = &PicoCpuFM68k;
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160 void SekStepM68k(void)
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162 SekCycleAim=SekCycleCnt+1;
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163 #if defined(EMU_CORE_DEBUG)
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164 SekCycleCnt+=CM_compareRun(1, 0);
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165 #elif defined(EMU_C68K)
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166 PicoCpuCM68k.cycles=1;
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167 CycloneRun(&PicoCpuCM68k);
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168 SekCycleCnt+=1-PicoCpuCM68k.cycles;
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169 #elif defined(EMU_M68K)
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170 SekCycleCnt+=m68k_execute(1);
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171 #elif defined(EMU_F68K)
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172 SekCycleCnt+=fm68k_emulate(1, 0, 0);
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176 PICO_INTERNAL void SekSetRealTAS(int use_real)
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179 CycloneSetRealTAS(use_real);
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187 /* idle loop detection, not to be used in CD mode */
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189 #include "cpu/Cyclone/tools/idle.h"
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192 static int *idledet_addrs = NULL;
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193 static int idledet_count = 0, idledet_bads = 0;
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194 int idledet_start_frame = 0;
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197 #define IDLE_STATS 1
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198 unsigned int idlehit_addrs[128], idlehit_counts[128];
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200 void SekRegisterIdleHit(unsigned int pc)
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203 for (i = 0; i < 127 && idlehit_addrs[i]; i++) {
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204 if (idlehit_addrs[i] == pc) {
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205 idlehit_counts[i]++;
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209 idlehit_addrs[i] = pc;
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210 idlehit_counts[i] = 1;
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211 idlehit_addrs[i+1] = 0;
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215 void SekInitIdleDet(void)
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217 void *tmp = realloc(idledet_addrs, 0x200*4);
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219 free(idledet_addrs);
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220 idledet_addrs = NULL;
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223 idledet_addrs = tmp;
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224 idledet_count = idledet_bads = 0;
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225 idledet_start_frame = Pico.m.frame_count + 360;
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227 idlehit_addrs[0] = 0;
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234 fm68k_emulate(0, 0, 1);
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238 int SekIsIdleCode(unsigned short *dst, int bytes)
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240 // printf("SekIsIdleCode %04x %i\n", *dst, bytes);
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244 if ((*dst & 0xf000) != 0x6000) // not another branch
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248 if ( (*dst & 0xfff8) == 0x4a10 || // tst.b ($aX) // there should be no need to wait
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249 (*dst & 0xfff8) == 0x4a28 || // tst.b ($xxxx,a0) // for byte change anywhere
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250 (*dst & 0xff3f) == 0x4a38 || // tst.x ($xxxx.w); tas ($xxxx.w)
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251 (*dst & 0xc1ff) == 0x0038 || // move.x ($xxxx.w), dX
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252 (*dst & 0xf13f) == 0xb038) // cmp.x ($xxxx.w), dX
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256 if ( ((dst[1] & 0xe0) == 0xe0 && ( // RAM and
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257 *dst == 0x4a39 || // tst.b ($xxxxxxxx)
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258 *dst == 0x4a79 || // tst.w ($xxxxxxxx)
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259 *dst == 0x4ab9 || // tst.l ($xxxxxxxx)
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260 (*dst & 0xc1ff) == 0x0039 || // move.x ($xxxxxxxx), dX
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261 (*dst & 0xf13f) == 0xb039))||// cmp.x ($xxxxxxxx), dX
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262 *dst == 0x0838 || // btst $X, ($xxxx.w) [6 byte op]
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263 (*dst & 0xffbf) == 0x0c38) // cmpi.{b,w} $X, ($xxxx.w)
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267 if ( ((dst[2] & 0xe0) == 0xe0 && ( // RAM and
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268 *dst == 0x0839 || // btst $X, ($xxxxxxxx.w) [8 byte op]
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269 (*dst & 0xffbf) == 0x0c39))||// cmpi.{b,w} $X, ($xxxxxxxx)
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270 *dst == 0x0cb8) // cmpi.l $X, ($xxxx.w)
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274 if ((*dst & 0xf1f8) == 0x3010 && // move.w (aX), dX
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275 (dst[1]&0xf100) == 0x0000 && // arithmetic
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276 (dst[3]&0xf100) == 0x0000) // arithmetic
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284 int SekRegisterIdlePatch(unsigned int pc, int oldop, int newop, void *ctx)
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286 int is_main68k = 1;
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287 #if defined(EMU_C68K)
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288 struct Cyclone *cyc = ctx;
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289 is_main68k = cyc == &PicoCpuCM68k;
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290 pc -= cyc->membase;
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291 #elif defined(EMU_F68K)
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292 is_main68k = ctx == &PicoCpuFM68k;
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295 elprintf(EL_IDLE, "idle: patch %06x %04x %04x %c %c #%i", pc, oldop, newop,
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296 (newop&0x200)?'n':'y', is_main68k?'m':'s', idledet_count);
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298 if (pc > Pico.romsize && !(PicoAHW & PAHW_SVP)) {
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299 if (++idledet_bads > 128) return 2; // remove detector
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300 return 1; // don't patch
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303 if (idledet_count >= 0x200 && (idledet_count & 0x1ff) == 0) {
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304 void *tmp = realloc(idledet_addrs, (idledet_count+0x200)*4);
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305 if (tmp == NULL) return 1;
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306 idledet_addrs = tmp;
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309 if (pc < Pico.romsize)
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310 idledet_addrs[idledet_count++] = pc;
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315 void SekFinishIdleDet(void)
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318 CycloneFinishIdle();
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321 fm68k_emulate(0, 0, 2);
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323 while (idledet_count > 0)
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325 unsigned short *op = (unsigned short *)&Pico.rom[idledet_addrs[--idledet_count]];
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326 if ((*op & 0xfd00) == 0x7100)
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327 *op &= 0xff, *op |= 0x6600;
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328 else if ((*op & 0xfd00) == 0x7500)
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329 *op &= 0xff, *op |= 0x6700;
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330 else if ((*op & 0xfd00) == 0x7d00)
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331 *op &= 0xff, *op |= 0x6000;
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333 elprintf(EL_STATUS|EL_IDLE, "idle: don't know how to restore %04x", *op);
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338 #if defined(EMU_M68K) && M68K_INSTRUCTION_HOOK == OPT_SPECIFY_HANDLER
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339 static unsigned char op_flags[0x400000/2] = { 0, };
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340 static int atexit_set = 0;
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342 static void make_idc(void)
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344 FILE *f = fopen("idc.idc", "w");
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347 fprintf(f, "#include <idc.idc>\nstatic main() {\n");
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348 for (i = 0; i < 0x400000/2; i++)
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349 if (op_flags[i] != 0)
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350 fprintf(f, " MakeCode(0x%06x);\n", i*2);
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355 void instruction_hook(void)
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361 if (REG_PC < 0x400000)
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362 op_flags[REG_PC/2] = 1;
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