2 // This file is part of the Cyclone 68000 Emulator
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4 // Copyright (c) 2004,2011 FinalDave (emudave (at) gmail.com)
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5 // Copyright (c) 2005-2011 GraÅžvydas "notaz" Ignotas (notasas (at) gmail.com)
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7 // This code is licensed under the GNU General Public License version 2.0 and the MAME License.
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8 // You can choose the license that has the most advantages for you.
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10 // SVN repository can be found at http://code.google.com/p/cyclone68000/
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15 // --------------------- Opcodes 0x0000+ ---------------------
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16 // Emit an Ori/And/Sub/Add/Eor/Cmp Immediate opcode, 0000ttt0 ssaaaaaa
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22 const char *shiftstr="";
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24 // Get source and target EA
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25 type=(op>>9)&7; if (type==4 || type>=7) return 1;
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26 size=(op>>6)&3; if (size>=3) return 1;
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30 // See if we can do this opcode:
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31 if (EaCanRead(tea,size)==0) return 1;
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32 if (EaCanWrite(tea)==0 || EaAn(tea)) return 1;
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34 use=OpBase(op,size);
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35 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
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37 OpStart(op, sea, tea); Cycles=4;
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39 // imm must be read first
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40 EaCalcReadNoSE(-1,10,sea,size,0);
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41 EaCalcReadNoSE((type!=6)?11:-1,0,tea,size,0x003f);
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43 if (size<2) shiftstr=(char *)(size?",asl #16":",asl #24");
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44 if (size<2) ot(" mov r10,r10,asl #%i\n",size?16:24);
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46 ot(";@ Do arithmetic:\n");
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48 if (type==0) ot(" orr r1,r10,r0%s\n",shiftstr);
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49 if (type==1) ot(" and r1,r10,r0%s\n",shiftstr);
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50 if (type==2||type==6)
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51 ot(" rsbs r1,r10,r0%s ;@ Defines NZCV\n",shiftstr);
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52 if (type==3) ot(" adds r1,r10,r0%s ;@ Defines NZCV\n",shiftstr);
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53 if (type==5) ot(" eor r1,r10,r0%s\n",shiftstr);
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55 if (type<2 || type==5) ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n"); // 0,1,5
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57 if (type< 2) OpGetFlags(0,0); // Ori/And
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58 if (type==2) OpGetFlags(1,1); // Sub: Subtract/X-bit
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59 if (type==3) OpGetFlags(0,1); // Add: X-bit
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60 if (type==5) OpGetFlags(0,0); // Eor
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61 if (type==6) OpGetFlags(1,0); // Cmp: Subtract
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66 EaWrite(11, 1, tea,size,0x003f,1);
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72 if (size>=2 && tea<0x10) Cycles+=2;
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76 if (size>=2) Cycles+=4;
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77 if (tea>=8) Cycles+=4;
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78 if (type==1 && size>=2 && tea<8) Cycles-=2;
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86 // --------------------- Opcodes 0x5000+ ---------------------
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89 // 0101nnnt xxeeeeee (nnn=#8,1-7 t=addq/subq xx=size, eeeeee=EA)
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90 int num=0,type=0,size=0,ea=0;
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95 num =(op>>9)&7; if (num==0) num=8;
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97 size=(op>>6)&3; if (size>=3) return 1;
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100 // See if we can do this opcode:
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101 if (EaCanRead (ea,size)==0) return 1;
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102 if (EaCanWrite(ea) ==0) return 1;
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103 if (size == 0 && EaAn(ea) ) return 1;
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105 use=OpBase(op,size,1);
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107 if (num!=8) use|=0x0e00; // If num is not 8, use same handler
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108 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
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112 if(type==0&&size==1) Cycles=ea<0x10?4:8;
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113 if(size>=2) Cycles=ea<0x10?8:12;
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115 if (size>0 && (ea&0x38)==0x08) size=2; // addq.w #n,An is also 32-bit
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117 EaCalcReadNoSE(11,0,ea,size,0x003f);
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119 shift=32-(8<<size);
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125 ot(" and r2,r8,#0x0e00 ;@ Get quick value\n");
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127 if (lsr>=0) sprintf(count,"r2,lsr #%d", lsr);
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128 else sprintf(count,"r2,lsl #%d", -lsr);
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134 sprintf(count,"#0x%.4x",8<<shift);
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137 if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);
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139 if (type==0) ot(" adds r1,r0,%s\n",count);
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140 if (type==1) ot(" subs r1,r0,%s\n",count);
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142 if ((ea&0x38)!=0x08) OpGetFlags(type,1);
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145 EaWrite(11, 1, ea,size,0x003f,1);
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152 // --------------------- Opcodes 0x8000+ ---------------------
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153 // 1t0tnnnd xxeeeeee (tt=type:or/sub/and/add xx=size, eeeeee=EA)
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154 int OpArithReg(int op)
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157 int type=0,size=0,dir=0,rea=0,ea=0;
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158 const char *asl="";
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159 const char *strop=0;
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163 dir =(op>> 8)&1; // er,re
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164 size=(op>> 6)&3; if (size>=3) return 1;
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167 if (dir && ea<0x10) return 1; // addx/subx opcode
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169 // See if we can do this opcode:
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170 if (dir==0 && EaCanRead (ea,size)==0) return 1;
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171 if (dir && EaCanWrite(ea)==0) return 1;
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172 if ((size==0||!(type&1))&&EaAn(ea)) return 1;
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174 use=OpBase(op,size);
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175 use&=~0x0e00; // Use same opcode for Dn
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176 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
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178 OpStart(op,ea); Cycles=4;
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180 EaCalcReadNoSE(dir?11:-1,0,ea,size,0x003f);
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182 EaCalcReadNoSE(dir?-1:11,1,rea,size,0x0e00);
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184 ot(";@ Do arithmetic:\n");
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185 if (type==0) strop = "orr";
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186 if (type==1) strop = (char *) (dir ? "subs" : "rsbs");
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187 if (type==4) strop = "and";
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188 if (type==5) strop = "adds";
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190 if (size==0) asl=",asl #24";
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191 if (size==1) asl=",asl #16";
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193 if (size<2) ot(" mov r0,r0%s\n",asl);
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194 ot(" %s r1,r0,r1%s\n",strop,asl);
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196 if ((type&1)==0) ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
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198 OpGetFlags(type==1,type&1); // 1==subtract
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201 ot(";@ Save result:\n");
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202 if (size<2) ot(" mov r1,r1,asr #%d\n",size?16:24);
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203 if (dir) EaWrite(11, 1, ea,size,0x003f,0,0);
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204 else EaWrite(11, 1,rea,size,0x0e00,0,0);
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207 if(ea<8) Cycles=(size>=2)?8:4; else Cycles+=(size>=2)?26:14;
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210 if(size>=2) Cycles+=4;
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214 if(ea<0x10||ea==0x3c) Cycles+=2;
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223 // --------------------- Opcodes 0x80c0+ ---------------------
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226 // Div/Mul: 1m00nnns 11eeeeee (m=Mul, nnn=Register Dn, s=signed, eeeeee=EA)
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227 int type=0,rea=0,sign=0,ea=0;
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230 type=(op>>14)&1; // div/mul
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235 // See if we can do this opcode:
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236 if (EaCanRead(ea,1)==0||EaAn(ea)) return 1;
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239 use&=~0x0e00; // Use same for all registers
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240 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
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243 if(type) Cycles=54;
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244 else Cycles=sign?158:140;
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246 EaCalcReadNoSE(-1,0,ea,1,0x003f);
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248 EaCalc(11,0x0e00,rea, 2);
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249 EaRead(11, 2,rea, 2,0x0e00);
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251 ot(" movs r1,r0,asl #16\n");
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253 if (type==0) // div
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255 // the manual says C is always cleared, but neither Musashi nor FAME do that
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256 //ot(" bic r10,r10,#0x20000000 ;@ always clear C\n");
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257 ot(" beq divzero%.4x ;@ division by zero\n",op);
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262 ot(" mov r12,#0 ;@ r12 = 1 or 2 if the result is negative\n");
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263 ot(" tst r2,r2\n");
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264 ot(" orrmi r12,r12,#2\n");
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265 ot(" rsbmi r2,r2,#0 ;@ Make r2 positive\n");
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267 ot(" movs r0,r1,asr #16\n");
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268 ot(" orrmi r12,r12,#1\n");
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269 ot(" rsbmi r0,r0,#0 ;@ Make r0 positive\n");
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271 ot(";@ detect the nasty 0x80000000 / -1 situation\n");
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272 ot(" mov r3,r2,asr #31\n");
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273 ot(" eors r3,r3,r1,asr #16\n");
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274 ot(" beq wrendofop%.4x\n",op);
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278 ot(" mov r0,r1,lsr #16 ;@ use only 16 bits of divisor\n");
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282 ot(";@ Divide r2 by r0\n");
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283 ot(" mov r3,#0\n");
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284 ot(" mov r1,r0\n");
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286 ot(";@ Shift up divisor till it's just less than numerator\n");
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287 ot("Shift%.4x%s\n",op,ms?"":":");
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288 ot(" cmp r1,r2,lsr #1\n");
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289 ot(" movls r1,r1,lsl #1\n");
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290 ot(" bcc Shift%.4x\n",op);
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293 ot("Divide%.4x%s\n",op,ms?"":":");
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294 ot(" cmp r2,r1\n");
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295 ot(" adc r3,r3,r3 ;@ Double r3 and add 1 if carry set\n");
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296 ot(" subcs r2,r2,r1\n");
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297 ot(" teq r1,r0\n");
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298 ot(" movne r1,r1,lsr #1\n");
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299 ot(" bne Divide%.4x\n",op);
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301 ot(";@r3==quotient,r2==remainder\n");
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306 ot(" and r1,r12,#1\n");
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307 ot(" teq r1,r12,lsr #1\n");
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308 ot(" rsbne r3,r3,#0 ;@ negate if quotient is negative\n");
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309 ot(" tst r12,#2\n");
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310 ot(" rsbne r2,r2,#0 ;@ negate the remainder if divident was negative\n");
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313 // signed overflow check
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314 ot(" mov r1,r3,asl #16\n");
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315 ot(" cmp r3,r1,asr #16 ;@ signed overflow?\n");
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316 ot(" orrne r10,r10,#0x10000000 ;@ set overflow flag\n");
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317 ot(" bne endofop%.4x ;@ overflow!\n",op);
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319 ot("wrendofop%.4x%s\n",op,ms?"":":");
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324 ot(" movs r1,r3,lsr #16 ;@ check for overflow condition\n");
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325 ot(" orrne r10,r10,#0x10000000 ;@ set overflow flag\n");
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326 ot(" bne endofop%.4x ;@ overflow!\n",op);
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330 ot(" mov r1,r3,lsl #16 ;@ Clip to 16-bits\n");
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331 ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
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334 ot(" mov r1,r1,lsr #16\n");
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335 ot(" orr r1,r1,r2,lsl #16 ;@ Insert remainder\n");
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340 ot(";@ Get 16-bit signs right:\n");
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341 ot(" mov r0,r1,%s #16\n",sign?"asr":"lsr");
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342 ot(" mov r2,r2,lsl #16\n");
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343 ot(" mov r2,r2,%s #16\n",sign?"asr":"lsr");
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346 ot(" mul r1,r2,r0\n");
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347 ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
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352 EaWrite(11, 1,rea, 2,0x0e00,1);
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354 if (type==0) ot("endofop%.4x%s\n",op,ms?"":":");
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357 if (type==0) // div
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359 ot("divzero%.4x%s\n",op,ms?"":":");
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360 ot(" mov r0,#5 ;@ Divide by zero\n");
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361 ot(" bl Exception\n");
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370 // Get X Bit into carry - trashes r2
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371 int GetXBit(int subtract)
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373 ot(";@ Get X bit:\n");
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374 ot(" ldr r2,[r7,#0x4c]\n");
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375 if (subtract) ot(" mvn r2,r2 ;@ Invert it\n");
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376 ot(" msr cpsr_flg,r2 ;@ Get into Carry\n");
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381 // --------------------- Opcodes 0x8100+ ---------------------
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382 // 1t00ddd1 0000asss - sbcd/abcd Ds,Dd or -(As),-(Ad)
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386 int type=0,sea=0,mem=0,dea=0;
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388 type=(op>>14)&1; // sbcd/abcd
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393 if (mem) { sea|=0x20; dea|=0x20; }
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395 use=op&~0x0e07; // Use same opcode for all registers..
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396 if (sea==0x27) use|=0x0007; // ___x.b -(a7)
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397 if (dea==0x27) use|=0x0e00; // ___x.b -(a7)
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398 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
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400 OpStart(op,sea,dea); Cycles=6;
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404 ot(";@ Get src/dest EA vals\n");
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405 EaCalc (0,0x000f, sea,0,1);
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406 EaRead (0, 6, sea,0,0x000f,1);
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407 EaCalcReadNoSE(11,0,dea,0,0x0e00);
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411 ot(";@ Get src/dest reg vals\n");
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412 EaCalcReadNoSE(-1,6,sea,0,0x0007);
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413 EaCalcReadNoSE(11,0,dea,0,0x0e00);
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414 ot(" mov r6,r6,asl #24\n");
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416 ot(" mov r1,r0,asl #24\n\n");
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418 ot(" bic r10,r10,#0xb1000000 ;@ clear all flags except old Z\n");
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422 ot(" ldr r0,[r7,#0x4c] ;@ Get X bit\n");
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423 ot(" mov r3,#0x00f00000\n");
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424 ot(" and r2,r3,r1,lsr #4\n");
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425 ot(" tst r0,#0x20000000\n");
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426 ot(" and r0,r3,r6,lsr #4\n");
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427 ot(" add r0,r0,r2\n");
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428 ot(" addne r0,r0,#0x00100000\n");
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429 // ot(" tst r0,#0x00800000\n");
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430 // ot(" orreq r10,r10,#0x01000000 ;@ Undefined V behavior\n");
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431 ot(" cmp r0,#0x00900000\n");
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432 ot(" addhi r0,r0,#0x00600000 ;@ Decimal adjust units\n");
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434 ot(" mov r2,r1,lsr #28\n");
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435 ot(" add r0,r0,r2,lsl #24\n");
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436 ot(" mov r2,r6,lsr #28\n");
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437 ot(" add r0,r0,r2,lsl #24\n");
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438 ot(" cmp r0,#0x09900000\n");
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439 ot(" orrhi r10,r10,#0x20000000 ;@ C\n");
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440 ot(" subhi r0,r0,#0x0a000000\n");
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441 // ot(" and r3,r10,r0,lsr #3 ;@ Undefined V behavior part II\n");
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442 // ot(" orr r10,r10,r3,lsl #4 ;@ V\n");
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443 ot(" movs r0,r0,lsl #4\n");
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444 ot(" orrmi r10,r10,#0x90000000 ;@ Undefined N+V behavior\n"); // this is what Musashi really does
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445 ot(" bicne r10,r10,#0x40000000 ;@ Z flag\n");
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449 ot(" ldr r0,[r7,#0x4c] ;@ Get X bit\n");
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450 ot(" mov r3,#0x00f00000\n");
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451 ot(" and r2,r3,r6,lsr #4\n");
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452 ot(" tst r0,#0x20000000\n");
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453 ot(" and r0,r3,r1,lsr #4\n");
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454 ot(" sub r0,r0,r2\n");
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455 ot(" subne r0,r0,#0x00100000\n");
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456 // ot(" tst r0,#0x00800000\n");
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457 // ot(" orreq r10,r10,#0x01000000 ;@ Undefined V behavior\n");
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458 ot(" cmp r0,#0x00900000\n");
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459 ot(" subhi r0,r0,#0x00600000 ;@ Decimal adjust units\n");
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461 ot(" mov r2,r1,lsr #28\n");
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462 ot(" add r0,r0,r2,lsl #24\n");
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463 ot(" mov r2,r6,lsr #28\n");
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464 ot(" sub r0,r0,r2,lsl #24\n");
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465 ot(" cmp r0,#0x09900000\n");
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466 ot(" orrhi r10,r10,#0xa0000000 ;@ N and C\n");
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467 ot(" addhi r0,r0,#0x0a000000\n");
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468 // ot(" and r3,r10,r0,lsr #3 ;@ Undefined V behavior part II\n");
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469 // ot(" orr r10,r10,r3,lsl #4 ;@ V\n");
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470 ot(" movs r0,r0,lsl #4\n");
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471 // ot(" orrmi r10,r10,#0x80000000 ;@ Undefined N behavior\n");
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472 ot(" bicne r10,r10,#0x40000000 ;@ Z flag\n");
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475 ot(" str r10,[r7,#0x4c] ;@ Save X bit\n");
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478 EaWrite(11, 0, dea,0,0x0e00,1);
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480 ot(" ldr r6,[r7,#0x54]\n");
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486 // 01001000 00eeeeee - nbcd <ea>
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494 if(EaCanWrite(ea)==0||EaAn(ea)) return 1;
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497 if(op!=use) { OpUse(op,use); return 0; } // Use existing handler
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499 OpStart(op,ea); Cycles=6;
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500 if(ea >= 8) Cycles+=2;
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502 EaCalcReadNoSE(6,0,ea,0,0x003f);
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504 // this is rewrite of Musashi's code
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505 ot(" ldr r2,[r7,#0x4c]\n");
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506 ot(" bic r10,r10,#0xb0000000 ;@ clear all flags, except Z\n");
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507 ot(" mov r0,r0,asl #24\n");
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508 ot(" and r2,r2,#0x20000000\n");
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509 ot(" add r2,r0,r2,lsr #5 ;@ add X\n");
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510 ot(" rsb r11,r2,#0x9a000000 ;@ do arithmetic\n");
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512 ot(" cmp r11,#0x9a000000\n");
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513 ot(" beq finish%.4x\n",op);
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516 ot(" mvn r3,r11,lsr #31 ;@ Undefined V behavior\n",op);
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517 ot(" and r2,r11,#0x0f000000\n");
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518 ot(" cmp r2,#0x0a000000\n");
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519 ot(" andeq r11,r11,#0xf0000000\n");
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520 ot(" addeq r11,r11,#0x10000000\n");
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521 ot(" and r3,r3,r11,lsr #31 ;@ Undefined V behavior part II\n",op);
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522 ot(" movs r1,r11,asr #24\n");
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523 ot(" bicne r10,r10,#0x40000000 ;@ Z\n");
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524 ot(" orr r10,r10,r3,lsl #28 ;@ save V\n",op);
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525 ot(" orr r10,r10,#0x20000000 ;@ C\n");
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528 EaWrite(6, 1, ea,0,0x3f,0,0);
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530 ot("finish%.4x%s\n",op,ms?"":":");
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531 ot(" tst r11,r11\n");
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532 ot(" orrmi r10,r10,#0x80000000 ;@ N\n");
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533 ot(" str r10,[r7,#0x4c] ;@ Save X\n");
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536 ot(" ldr r6,[r7,#0x54]\n");
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542 // --------------------- Opcodes 0x90c0+ ---------------------
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543 // Suba/Cmpa/Adda 1tt1nnnx 11eeeeee (tt=type, x=size, eeeeee=Source EA)
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544 int OpAritha(int op)
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547 int type=0,size=0,sea=0,dea=0;
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548 const char *asr="";
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550 // Suba/Cmpa/Adda/(invalid):
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551 type=(op>>13)&3; if (type>=3) return 1;
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553 size=(op>>8)&1; size++;
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554 dea=(op>>9)&7; dea|=8; // Dest=An
\r
555 sea=op&0x003f; // Source
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557 // See if we can do this opcode:
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558 if (EaCanRead(sea,size)==0) return 1;
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560 use=OpBase(op,size);
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561 use&=~0x0e00; // Use same opcode for An
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562 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
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564 OpStart(op,sea); Cycles=(size==2)?6:8;
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565 if(size==2&&(sea<0x10||sea==0x3c)) Cycles+=2;
\r
566 if(type==1) Cycles=6;
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568 // EA calculation order defines how situations like suba.w (A0)+, A0 get handled.
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569 // different emus act differently in this situation, I couldn't fugure which is right behaviour.
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572 EaCalcReadNoSE(-1,0,sea,size,0x003f);
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573 EaCalcReadNoSE(type!=1?11:-1,1,dea,2,0x0e00);
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578 EaCalcReadNoSE(type!=1?11:-1,1,dea,2,0x0e00);
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579 EaCalcReadNoSE(-1,0,sea,size,0x003f);
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583 if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);
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584 if (size<2) asr=(char *)(size?",asr #16":",asr #24");
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586 if (type==0) ot(" sub r1,r1,r0%s\n",asr);
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587 if (type==1) ot(" cmp r1,r0%s ;@ Defines NZCV\n",asr);
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588 if (type==1) OpGetFlags(1,0); // Get Cmp flags
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589 if (type==2) ot(" add r1,r1,r0%s\n",asr);
\r
592 if (type!=1) EaWrite(11, 1, dea,2,0x0e00);
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599 // --------------------- Opcodes 0x9100+ ---------------------
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600 // Emit a Subx/Addx opcode, 1t01ddd1 zz00rsss addx.z Ds,Dd
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604 int type=0,size=0,dea=0,sea=0,mem=0;
\r
605 const char *asl="";
\r
609 size=(op>> 6)&3; if (size>=3) return 1;
\r
613 // See if we can do this opcode:
\r
614 if (EaCanRead(sea,size)==0) return 1;
\r
615 if (EaCanWrite(dea)==0) return 1;
\r
617 if (mem) { sea+=0x20; dea+=0x20; }
\r
619 use=op&~0x0e07; // Use same opcode for Dn
\r
620 if (size==0&&sea==0x27) use|=0x0007; // ___x.b -(a7)
\r
621 if (size==0&&dea==0x27) use|=0x0e00; // ___x.b -(a7)
\r
622 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
\r
624 OpStart(op,sea,dea); Cycles=4;
\r
625 if(size>=2) Cycles+=4;
\r
626 if(sea>=0x10) Cycles+=2;
\r
630 ot(";@ Get src/dest EA vals\n");
\r
631 EaCalc (0,0x000f, sea,size,1);
\r
632 EaRead (0, 6, sea,size,0x000f,1);
\r
633 EaCalcReadNoSE(11,0,dea,size,0x0e00);
\r
637 ot(";@ Get src/dest reg vals\n");
\r
638 EaCalcReadNoSE(-1,6,sea,size,0x0007);
\r
639 EaCalcReadNoSE(11,0,dea,size,0x0e00);
\r
640 if (size<2) ot(" mov r6,r6,asl #%d\n\n",size?16:24);
\r
643 if (size<2) asl=(char *)(size?",asl #16":",asl #24");
\r
645 ot(";@ Do arithmetic:\n");
\r
648 if (type==1 && size<2)
\r
650 ot(";@ Make sure the carry bit will tip the balance:\n");
\r
651 ot(" mvn r2,#0\n");
\r
652 ot(" orr r6,r6,r2,lsr #%i\n",(size==0)?8:16);
\r
656 if (type==0) ot(" rscs r1,r6,r0%s\n",asl);
\r
657 if (type==1) ot(" adcs r1,r6,r0%s\n",asl);
\r
658 ot(" orr r3,r10,#0xb0000000 ;@ for old Z\n");
\r
659 OpGetFlags(type==0,1,0); // subtract
\r
661 ot(" movs r2,r1,lsr #%i\n", size?16:24);
\r
662 ot(" orreq r10,r10,#0x40000000 ;@ add potentially missed Z\n");
\r
664 ot(" andeq r10,r10,r3 ;@ fix Z\n");
\r
667 ot(";@ Save result:\n");
\r
668 EaWrite(11, 1, dea,size,0x0e00,1);
\r
670 ot(" ldr r6,[r7,#0x54]\n");
\r
676 // --------------------- Opcodes 0xb000+ ---------------------
\r
677 // Emit a Cmp/Eor opcode, 1011rrrt xxeeeeee (rrr=Dn, t=cmp/eor, xx=size extension, eeeeee=ea)
\r
678 int OpCmpEor(int op)
\r
681 int size=0,ea=0,use=0;
\r
682 const char *asl="";
\r
684 // Get EA and register EA
\r
687 size=(op>>6)&3; if (size>=3) return 1;
\r
690 if (eor && (ea>>3) == 1) return 1; // not a valid mode for eor
\r
692 // See if we can do this opcode:
\r
693 if (EaCanRead(ea,size)==0) return 1;
\r
694 if (eor && EaCanWrite(ea)==0) return 1;
\r
695 if (EaAn(ea)&&(eor||size==0)) return 1;
\r
697 use=OpBase(op,size);
\r
698 use&=~0x0e00; // Use 1 handler for register d0-7
\r
699 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
\r
701 OpStart(op,ea); Cycles=4;
\r
703 if(ea>8) Cycles+=4;
\r
704 if(size>=2) Cycles+=4;
\r
706 if(size>=2) Cycles+=2;
\r
709 ot(";@ Get EA into r11 and value into r0:\n");
\r
710 EaCalcReadNoSE(eor?11:-1,0,ea,size,0x003f);
\r
712 ot(";@ Get register operand into r1:\n");
\r
713 EaCalcReadNoSE(-1,1,rea,size,0x0e00);
\r
715 if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);
\r
716 if (size<2) asl=(char *)(size?",asl #16":",asl #24");
\r
718 ot(";@ Do arithmetic:\n");
\r
719 if (eor==0) ot(" rsbs r1,r0,r1%s\n",asl);
\r
722 ot(" eor r1,r0,r1%s\n",asl);
\r
723 ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
\r
726 OpGetFlags(eor==0,0); // Cmp like subtract
\r
729 if (eor) EaWrite(11, 1,ea,size,0x003f,1);
\r
735 // Emit a Cmpm opcode, 1011ddd1 xx001sss (rrr=Adst, xx=size extension, sss=Asrc)
\r
738 int size=0,sea=0,dea=0,use=0;
\r
739 const char *asl="";
\r
741 // get size, get EAs
\r
742 size=(op>>6)&3; if (size>=3) return 1;
\r
746 use=op&~0x0e07; // Use 1 handler for all registers..
\r
747 if (size==0&&sea==0x1f) use|=0x0007; // ..except (a7)+
\r
748 if (size==0&&dea==0x1f) use|=0x0e00;
\r
749 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
\r
751 OpStart(op,sea); Cycles=4;
\r
753 ot(";@ Get src operand into r11:\n");
\r
754 EaCalc (0,0x0007, sea,size,1);
\r
755 EaRead (0, 11, sea,size,0x0007,1);
\r
757 ot(";@ Get dst operand into r0:\n");
\r
758 EaCalcReadNoSE(-1,0,dea,size,0x0e00);
\r
760 if (size<2) asl=(char *)(size?",asl #16":",asl #24");
\r
762 ot(" rsbs r0,r11,r0%s\n",asl);
\r
763 OpGetFlags(1,0); // Cmp like subtract
\r
771 // Emit a Chk opcode, 0100ddd1 x0eeeeee (rrr=Dn, x=size extension, eeeeee=ea)
\r
775 int size=0,ea=0,use=0;
\r
777 // Get EA and register EA
\r
780 size=1; // word operation
\r
781 else size=2; // long
\r
784 if (EaAn(ea)) return 1; // not a valid mode
\r
785 if (size!=1) return 1; // 000 variant only supports word
\r
787 // See if we can do this opcode:
\r
788 if (EaCanRead(ea,size)==0) return 1;
\r
790 use=OpBase(op,size);
\r
791 use&=~0x0e00; // Use 1 handler for register d0-7
\r
792 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
\r
794 OpStart(op,ea); Cycles=10;
\r
796 ot(";@ Get value into r0:\n");
\r
797 EaCalcReadNoSE(-1,0,ea,size,0x003f);
\r
799 ot(";@ Get register operand into r1:\n");
\r
800 EaCalcReadNoSE(-1,1,rea,size,0x0e00);
\r
802 if (size<2) ot(" mov r0,r0,asl #%d\n",size?16:24);
\r
803 if (size<2) ot(" mov r1,r1,asl #%d\n\n",size?16:24);
\r
805 ot(";@ get flags, including undocumented ones\n");
\r
806 ot(" and r3,r10,#0x80000000\n");
\r
807 ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
\r
810 ot(";@ is reg negative?\n");
\r
811 ot(" bmi chktrap%.4x\n",op);
\r
813 ot(";@ Do arithmetic:\n");
\r
814 ot(" bic r10,r10,#0x80000000 ;@ N\n");
\r
815 ot(" cmp r1,r0\n");
\r
816 ot(" bgt chktrap%.4x\n",op);
\r
818 ot(";@ old N remains\n");
\r
819 ot(" orr r10,r10,r3\n");
\r
822 ot("chktrap%.4x%s ;@ CHK exception:\n",op,ms?"":":");
\r
823 ot(" mov r0,#6\n");
\r
824 ot(" bl Exception\n");
\r