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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14 int SekCycleCnt=0; // cycles done in this frame
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15 int SekCycleAim=0; // cycle aim
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16 unsigned int SekCycleCntT=0;
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22 struct Cyclone PicoCpuCM68k;
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26 m68ki_cpu_core PicoCpuMM68k;
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30 M68K_CONTEXT PicoCpuFM68k;
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36 // interrupt acknowledgment
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37 static int SekIntAck(int level)
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39 // try to emulate VDP's reaction to 68000 int ack
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40 if (level == 4) { Pico.video.pending_ints = 0; elprintf(EL_INTS, "hack: @ %06x [%i]", SekPc, SekCycleCnt); }
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41 else if(level == 6) { Pico.video.pending_ints &= ~0x20; elprintf(EL_INTS, "vack: @ %06x [%i]", SekPc, SekCycleCnt); }
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42 PicoCpuCM68k.irq = 0;
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43 return CYCLONE_INT_ACK_AUTOVECTOR;
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46 static void SekResetAck(void)
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48 elprintf(EL_ANOMALY, "Reset encountered @ %06x", SekPc);
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51 static int SekUnrecognizedOpcode()
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55 elprintf(EL_ANOMALY, "Unrecognized Opcode @ %06x", pc);
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56 // see if we are still in a mapped region
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58 if (map_flag_set(m68k_read16_map[pc >> M68K_MEM_SHIFT])) {
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59 elprintf(EL_STATUS|EL_ANOMALY, "m68k crash @%06x", pc);
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60 PicoCpuCM68k.cycles = 0;
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61 PicoCpuCM68k.state_flags |= 1;
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64 #ifdef EMU_M68K // debugging cyclone
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66 extern int have_illegal;
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76 static int SekIntAckM68K(int level)
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78 if (level == 4) { Pico.video.pending_ints = 0; elprintf(EL_INTS, "hack: @ %06x [%i]", SekPc, SekCycleCnt); }
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79 else if(level == 6) { Pico.video.pending_ints &= ~0x20; elprintf(EL_INTS, "vack: @ %06x [%i]", SekPc, SekCycleCnt); }
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81 return M68K_INT_ACK_AUTOVECTOR;
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84 static int SekTasCallback(void)
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86 return 0; // no writeback
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92 static void SekIntAckF68K(unsigned level)
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94 if (level == 4) { Pico.video.pending_ints = 0; elprintf(EL_INTS, "hack: @ %06x [%i]", SekPc, SekCycleCnt); }
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95 else if(level == 6) { Pico.video.pending_ints &= ~0x20; elprintf(EL_INTS, "vack: @ %06x [%i]", SekPc, SekCycleCnt); }
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96 PicoCpuFM68k.interrupts[0] = 0;
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101 PICO_INTERNAL void SekInit(void)
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105 memset(&PicoCpuCM68k,0,sizeof(PicoCpuCM68k));
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106 PicoCpuCM68k.IrqCallback=SekIntAck;
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107 PicoCpuCM68k.ResetCallback=SekResetAck;
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108 PicoCpuCM68k.UnrecognizedCallback=SekUnrecognizedOpcode;
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109 PicoCpuCM68k.flags=4; // Z set
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113 void *oldcontext = m68ki_cpu_p;
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114 m68k_set_context(&PicoCpuMM68k);
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115 m68k_set_cpu_type(M68K_CPU_TYPE_68000);
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117 m68k_set_int_ack_callback(SekIntAckM68K);
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118 m68k_set_tas_instr_callback(SekTasCallback);
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119 //m68k_pulse_reset();
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120 m68k_set_context(oldcontext);
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125 void *oldcontext = g_m68kcontext;
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126 g_m68kcontext = &PicoCpuFM68k;
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127 memset(&PicoCpuFM68k, 0, sizeof(PicoCpuFM68k));
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129 PicoCpuFM68k.iack_handler = SekIntAckF68K;
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130 PicoCpuFM68k.sr = 0x2704; // Z flag
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131 g_m68kcontext = oldcontext;
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137 // Reset the 68000:
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138 PICO_INTERNAL int SekReset(void)
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140 if (Pico.rom==NULL) return 1;
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143 CycloneReset(&PicoCpuCM68k);
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146 m68k_set_context(&PicoCpuMM68k); // if we ever reset m68k, we always need it's context to be set
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149 m68k_pulse_reset();
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154 g_m68kcontext = &PicoCpuFM68k;
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162 void SekStepM68k(void)
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164 SekCycleAim=SekCycleCnt+1;
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165 #if defined(EMU_CORE_DEBUG)
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166 SekCycleCnt+=CM_compareRun(1, 0);
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167 #elif defined(EMU_C68K)
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168 PicoCpuCM68k.cycles=1;
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169 CycloneRun(&PicoCpuCM68k);
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170 SekCycleCnt+=1-PicoCpuCM68k.cycles;
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171 #elif defined(EMU_M68K)
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172 SekCycleCnt+=m68k_execute(1);
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173 #elif defined(EMU_F68K)
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174 SekCycleCnt+=fm68k_emulate(1, 0, 0);
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178 PICO_INTERNAL void SekSetRealTAS(int use_real)
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181 CycloneSetRealTAS(use_real);
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188 // Pack the cpu into a common format:
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190 PICO_INTERNAL void SekPackCpu(unsigned char *cpu, int is_sub)
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194 #if defined(EMU_C68K)
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195 struct Cyclone *context = is_sub ? &PicoCpuCS68k : &PicoCpuCM68k;
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196 memcpy(cpu,context->d,0x40);
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197 pc=context->pc-context->membase;
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198 *(unsigned int *)(cpu+0x44)=CycloneGetSr(context);
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199 *(unsigned int *)(cpu+0x48)=context->osp;
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200 cpu[0x4c] = context->irq;
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201 cpu[0x4d] = context->state_flags & 1;
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202 #elif defined(EMU_M68K)
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203 void *oldcontext = m68ki_cpu_p;
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204 m68k_set_context(is_sub ? &PicoCpuMS68k : &PicoCpuMM68k);
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205 memcpy(cpu,m68ki_cpu_p->dar,0x40);
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206 pc=m68ki_cpu_p->pc;
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207 *(unsigned int *)(cpu+0x44)=m68k_get_reg(NULL, M68K_REG_SR);
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208 *(unsigned int *)(cpu+0x48)=m68ki_cpu_p->sp[m68ki_cpu_p->s_flag^SFLAG_SET];
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209 cpu[0x4c] = CPU_INT_LEVEL>>8;
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210 cpu[0x4d] = CPU_STOPPED;
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211 m68k_set_context(oldcontext);
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212 #elif defined(EMU_F68K)
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213 M68K_CONTEXT *context = is_sub ? &PicoCpuFS68k : &PicoCpuFM68k;
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214 memcpy(cpu,context->dreg,0x40);
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216 *(unsigned int *)(cpu+0x44)=context->sr;
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217 *(unsigned int *)(cpu+0x48)=context->asp;
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218 cpu[0x4c] = context->interrupts[0];
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219 cpu[0x4d] = (context->execinfo & FM68K_HALTED) ? 1 : 0;
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222 *(unsigned int *)(cpu+0x40)=pc;
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225 PICO_INTERNAL void SekUnpackCpu(const unsigned char *cpu, int is_sub)
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227 #if defined(EMU_C68K)
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228 struct Cyclone *context = is_sub ? &PicoCpuCS68k : &PicoCpuCM68k;
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229 CycloneSetSr(context, *(unsigned int *)(cpu+0x44));
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230 context->osp=*(unsigned int *)(cpu+0x48);
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231 memcpy(context->d,cpu,0x40);
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232 context->membase = 0;
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233 context->pc = *(unsigned int *)(cpu+0x40);
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234 CycloneUnpack(context, NULL); // rebase PC
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235 context->irq = cpu[0x4c];
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236 context->state_flags = 0;
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238 context->state_flags |= 1;
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239 #elif defined(EMU_M68K)
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240 void *oldcontext = m68ki_cpu_p;
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241 m68k_set_context(is_sub ? &PicoCpuMS68k : &PicoCpuMM68k);
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242 m68k_set_reg(M68K_REG_SR, *(unsigned int *)(cpu+0x44));
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243 memcpy(m68ki_cpu_p->dar,cpu,0x40);
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244 m68ki_cpu_p->pc=*(unsigned int *)(cpu+0x40);
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245 m68ki_cpu_p->sp[m68ki_cpu_p->s_flag^SFLAG_SET]=*(unsigned int *)(cpu+0x48);
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246 CPU_INT_LEVEL = cpu[0x4c] << 8;
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247 CPU_STOPPED = cpu[0x4d];
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248 m68k_set_context(oldcontext);
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249 #elif defined(EMU_F68K)
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250 M68K_CONTEXT *context = is_sub ? &PicoCpuFS68k : &PicoCpuFM68k;
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251 memcpy(context->dreg,cpu,0x40);
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252 context->pc =*(unsigned int *)(cpu+0x40);
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253 context->sr =*(unsigned int *)(cpu+0x44);
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254 context->asp=*(unsigned int *)(cpu+0x48);
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255 context->interrupts[0] = cpu[0x4c];
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256 context->execinfo &= ~FM68K_HALTED;
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257 if (cpu[0x4d]&1) context->execinfo |= FM68K_HALTED;
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262 /* idle loop detection, not to be used in CD mode */
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264 #include "cpu/Cyclone/tools/idle.h"
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267 static unsigned short **idledet_ptrs = NULL;
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268 static int idledet_count = 0, idledet_bads = 0;
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269 int idledet_start_frame = 0;
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272 #define IDLE_STATS 1
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273 unsigned int idlehit_addrs[128], idlehit_counts[128];
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275 void SekRegisterIdleHit(unsigned int pc)
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278 for (i = 0; i < 127 && idlehit_addrs[i]; i++) {
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279 if (idlehit_addrs[i] == pc) {
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280 idlehit_counts[i]++;
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284 idlehit_addrs[i] = pc;
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285 idlehit_counts[i] = 1;
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286 idlehit_addrs[i+1] = 0;
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290 void SekInitIdleDet(void)
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292 unsigned short **tmp = realloc(idledet_ptrs, 0x200*4);
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294 free(idledet_ptrs);
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295 idledet_ptrs = NULL;
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298 idledet_ptrs = tmp;
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299 idledet_count = idledet_bads = 0;
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300 idledet_start_frame = Pico.m.frame_count + 360;
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302 idlehit_addrs[0] = 0;
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309 fm68k_emulate(0, 0, 1);
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313 int SekIsIdleCode(unsigned short *dst, int bytes)
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315 // printf("SekIsIdleCode %04x %i\n", *dst, bytes);
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319 if ((*dst & 0xf000) != 0x6000) // not another branch
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323 if ( (*dst & 0xfff8) == 0x4a10 || // tst.b ($aX) // there should be no need to wait
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324 (*dst & 0xfff8) == 0x4a28 || // tst.b ($xxxx,a0) // for byte change anywhere
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325 (*dst & 0xff3f) == 0x4a38 || // tst.x ($xxxx.w); tas ($xxxx.w)
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326 (*dst & 0xc1ff) == 0x0038 || // move.x ($xxxx.w), dX
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327 (*dst & 0xf13f) == 0xb038) // cmp.x ($xxxx.w), dX
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331 if ( ((dst[1] & 0xe0) == 0xe0 && ( // RAM and
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332 *dst == 0x4a39 || // tst.b ($xxxxxxxx)
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333 *dst == 0x4a79 || // tst.w ($xxxxxxxx)
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334 *dst == 0x4ab9 || // tst.l ($xxxxxxxx)
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335 (*dst & 0xc1ff) == 0x0039 || // move.x ($xxxxxxxx), dX
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336 (*dst & 0xf13f) == 0xb039))||// cmp.x ($xxxxxxxx), dX
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337 *dst == 0x0838 || // btst $X, ($xxxx.w) [6 byte op]
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338 (*dst & 0xffbf) == 0x0c38) // cmpi.{b,w} $X, ($xxxx.w)
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342 if ( ((dst[2] & 0xe0) == 0xe0 && ( // RAM and
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343 *dst == 0x0839 || // btst $X, ($xxxxxxxx.w) [8 byte op]
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344 (*dst & 0xffbf) == 0x0c39))||// cmpi.{b,w} $X, ($xxxxxxxx)
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345 *dst == 0x0cb8) // cmpi.l $X, ($xxxx.w)
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349 if ((*dst & 0xf1f8) == 0x3010 && // move.w (aX), dX
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350 (dst[1]&0xf100) == 0x0000 && // arithmetic
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351 (dst[3]&0xf100) == 0x0000) // arithmetic
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359 int SekRegisterIdlePatch(unsigned int pc, int oldop, int newop, void *ctx)
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361 int is_main68k = 1;
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365 #if defined(EMU_C68K)
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366 struct Cyclone *cyc = ctx;
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367 is_main68k = cyc == &PicoCpuCM68k;
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368 pc -= cyc->membase;
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369 #elif defined(EMU_F68K)
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370 is_main68k = ctx == &PicoCpuFM68k;
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373 elprintf(EL_IDLE, "idle: patch %06x %04x %04x %c %c #%i", pc, oldop, newop,
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374 (newop&0x200)?'n':'y', is_main68k?'m':'s', idledet_count);
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376 // XXX: probably shouldn't patch RAM too
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377 v = m68k_read16_map[pc >> M68K_MEM_SHIFT];
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378 if (!(v & 0x80000000))
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379 target = (u16 *)((v << 1) + pc);
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381 if (++idledet_bads > 128)
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382 return 2; // remove detector
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383 return 1; // don't patch
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386 if (idledet_count >= 0x200 && (idledet_count & 0x1ff) == 0) {
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387 unsigned short **tmp = realloc(idledet_ptrs, (idledet_count+0x200)*4);
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390 idledet_ptrs = tmp;
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393 idledet_ptrs[idledet_count++] = target;
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398 void SekFinishIdleDet(void)
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401 CycloneFinishIdle();
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404 fm68k_emulate(0, 0, 2);
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406 while (idledet_count > 0)
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408 unsigned short *op = idledet_ptrs[--idledet_count];
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409 if ((*op & 0xfd00) == 0x7100)
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410 *op &= 0xff, *op |= 0x6600;
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411 else if ((*op & 0xfd00) == 0x7500)
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412 *op &= 0xff, *op |= 0x6700;
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413 else if ((*op & 0xfd00) == 0x7d00)
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414 *op &= 0xff, *op |= 0x6000;
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416 elprintf(EL_STATUS|EL_IDLE, "idle: don't know how to restore %04x", *op);
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421 #if defined(EMU_M68K) && M68K_INSTRUCTION_HOOK == OPT_SPECIFY_HANDLER
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422 static unsigned char op_flags[0x400000/2] = { 0, };
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423 static int atexit_set = 0;
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425 static void make_idc(void)
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427 FILE *f = fopen("idc.idc", "w");
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430 fprintf(f, "#include <idc.idc>\nstatic main() {\n");
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431 for (i = 0; i < 0x400000/2; i++)
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432 if (op_flags[i] != 0)
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433 fprintf(f, " MakeCode(0x%06x);\n", i*2);
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438 void instruction_hook(void)
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444 if (REG_PC < 0x400000)
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445 op_flags[REG_PC/2] = 1;
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