| 1 | \r |
| 2 | // This file is part of the Cyclone 68000 Emulator\r |
| 3 | \r |
| 4 | // Copyright (c) 2011 FinalDave (emudave (at) gmail.com)\r |
| 5 | \r |
| 6 | // This code is licensed under the GNU General Public License version 2.0 and the MAME License.\r |
| 7 | // You can choose the license that has the most advantages for you.\r |
| 8 | \r |
| 9 | // SVN repository can be found at http://code.google.com/p/cyclone68000/\r |
| 10 | \r |
| 11 | #include "app.h"\r |
| 12 | \r |
| 13 | // --------------------- Opcodes 0x0000+ ---------------------\r |
| 14 | // Emit an Ori/And/Sub/Add/Eor/Cmp Immediate opcode, 0000ttt0 00aaaaaa\r |
| 15 | int OpArith(int op)\r |
| 16 | {\r |
| 17 | int type=0,size=0;\r |
| 18 | int sea=0,tea=0;\r |
| 19 | int use=0;\r |
| 20 | \r |
| 21 | // Get source and target EA\r |
| 22 | type=(op>>9)&7; if (type==4 || type>=7) return 1;\r |
| 23 | size=(op>>6)&3; if (size>=3) return 1;\r |
| 24 | sea= 0x003c;\r |
| 25 | tea=op&0x003f;\r |
| 26 | \r |
| 27 | // See if we can do this opcode:\r |
| 28 | if (EaCanRead(tea,size)==0) return 1;\r |
| 29 | if (type!=6 && EaCanWrite(tea)==0) return 1;\r |
| 30 | \r |
| 31 | use=OpBase(op);\r |
| 32 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
| 33 | \r |
| 34 | OpStart(op); Cycles=4;\r |
| 35 | \r |
| 36 | EaCalc(10,0x0000, sea,size);\r |
| 37 | EaRead(10, 10, sea,size,1);\r |
| 38 | \r |
| 39 | EaCalc(11,0x003f, tea,size);\r |
| 40 | EaRead(11, 0, tea,size,1);\r |
| 41 | \r |
| 42 | ot(";@ Do arithmetic:\n");\r |
| 43 | \r |
| 44 | if (type==0) ot(" orr r1,r0,r10\n");\r |
| 45 | if (type==1) ot(" and r1,r0,r10\n");\r |
| 46 | if (type==2) ot(" subs r1,r0,r10 ;@ Defines NZCV\n");\r |
| 47 | if (type==3) ot(" adds r1,r0,r10 ;@ Defines NZCV\n");\r |
| 48 | if (type==5) ot(" eor r1,r0,r10\n");\r |
| 49 | if (type==6) ot(" cmp r0,r10 ;@ Defines NZCV\n");\r |
| 50 | \r |
| 51 | if (type<2 || type==5) ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n"); // 0,1,5\r |
| 52 | \r |
| 53 | if (type< 2) OpGetFlags(0,0); // Ori/And\r |
| 54 | if (type==2) OpGetFlags(1,1); // Sub: Subtract/X-bit\r |
| 55 | if (type==3) OpGetFlags(0,1); // Add: X-bit\r |
| 56 | if (type==5) OpGetFlags(0,0); // Eor\r |
| 57 | if (type==6) OpGetFlags(1,0); // Cmp: Subtract\r |
| 58 | ot("\n");\r |
| 59 | \r |
| 60 | if (type!=6)\r |
| 61 | {\r |
| 62 | EaWrite(11, 1, tea,size,1);\r |
| 63 | }\r |
| 64 | \r |
| 65 | // Correct cycles:\r |
| 66 | if (type==6)\r |
| 67 | {\r |
| 68 | if (size>=2 && tea<0x10) Cycles+=2;\r |
| 69 | }\r |
| 70 | else\r |
| 71 | {\r |
| 72 | if (size>=2) Cycles+=4;\r |
| 73 | if (tea>=0x10) Cycles+=4;\r |
| 74 | if (Amatch && type==1 && size>=2 && tea<0x10) Cycles-=2;\r |
| 75 | }\r |
| 76 | \r |
| 77 | OpEnd();\r |
| 78 | \r |
| 79 | return 0;\r |
| 80 | }\r |
| 81 | \r |
| 82 | // --------------------- Opcodes 0x5000+ ---------------------\r |
| 83 | int OpAddq(int op)\r |
| 84 | {\r |
| 85 | // 0101nnnt xxeeeeee (nnn=#8,1-7 t=addq/subq xx=size, eeeeee=EA)\r |
| 86 | int num=0,type=0,size=0,ea=0;\r |
| 87 | int use=0;\r |
| 88 | char count[16]="";\r |
| 89 | int shift=0;\r |
| 90 | \r |
| 91 | num =(op>>9)&7; if (num==0) num=8;\r |
| 92 | type=(op>>8)&1;\r |
| 93 | size=(op>>6)&3; if (size>=3) return 1;\r |
| 94 | ea = op&0x3f;\r |
| 95 | \r |
| 96 | // See if we can do this opcode:\r |
| 97 | if (EaCanRead (ea,size)==0) return 1;\r |
| 98 | if (EaCanWrite(ea )==0) return 1;\r |
| 99 | \r |
| 100 | use=op; if (ea<0x38) use&=~7;\r |
| 101 | if ((ea&0x38)==0x08) { size=2; use&=~0xc0; } // Every addq #n,An is 32-bit\r |
| 102 | \r |
| 103 | if (num!=8) use|=0x0e00; // If num is not 8, use same handler\r |
| 104 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
| 105 | \r |
| 106 | OpStart(op);\r |
| 107 | Cycles=ea<8?4:8;\r |
| 108 | if (size>=2 && ea!=8) Cycles+=4;\r |
| 109 | \r |
| 110 | EaCalc(10,0x003f, ea,size);\r |
| 111 | EaRead(10, 0, ea,size,1);\r |
| 112 | \r |
| 113 | shift=32-(8<<size);\r |
| 114 | \r |
| 115 | if (num!=8)\r |
| 116 | {\r |
| 117 | int lsr=9-shift;\r |
| 118 | \r |
| 119 | if (lsr>=0) ot(" mov r2,r8,lsr #%d ;@ Get quick value\n", lsr);\r |
| 120 | else ot(" mov r2,r8,lsl #%d ;@ Get quick value\n",-lsr);\r |
| 121 | \r |
| 122 | ot(" and r2,r2,#0x%.4x\n",7<<shift);\r |
| 123 | ot("\n");\r |
| 124 | strcpy(count,"r2");\r |
| 125 | }\r |
| 126 | \r |
| 127 | if (num==8) sprintf(count,"#0x%.4x",8<<shift);\r |
| 128 | \r |
| 129 | if (type==0) ot(" adds r1,r0,%s\n",count);\r |
| 130 | if (type==1) ot(" subs r1,r0,%s\n",count);\r |
| 131 | \r |
| 132 | if ((ea&0x38)!=0x08) OpGetFlags(type,1);\r |
| 133 | ot("\n");\r |
| 134 | \r |
| 135 | EaWrite(10, 1, ea,size,1);\r |
| 136 | \r |
| 137 | OpEnd();\r |
| 138 | \r |
| 139 | return 0;\r |
| 140 | }\r |
| 141 | \r |
| 142 | // --------------------- Opcodes 0x8000+ ---------------------\r |
| 143 | // 1t0tnnnd xxeeeeee (tt=type:or/sub/and/add xx=size, eeeeee=EA)\r |
| 144 | int OpArithReg(int op)\r |
| 145 | {\r |
| 146 | int use=0;\r |
| 147 | int type=0,size=0,dir=0,rea=0,ea=0;\r |
| 148 | \r |
| 149 | type=(op>>12)&5;\r |
| 150 | rea =(op>> 9)&7;\r |
| 151 | dir =(op>> 8)&1;\r |
| 152 | size=(op>> 6)&3; if (size>=3) return 1;\r |
| 153 | ea = op&0x3f;\r |
| 154 | \r |
| 155 | if (dir && ea<0x10) return 1; // addx/subx opcode\r |
| 156 | \r |
| 157 | // See if we can do this opcode:\r |
| 158 | if (dir==0 && EaCanWrite(rea)==0) return 1;\r |
| 159 | if (dir && EaCanWrite( ea)==0) return 1;\r |
| 160 | \r |
| 161 | use=OpBase(op);\r |
| 162 | use&=~0x0e00; // Use same opcode for Dn\r |
| 163 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
| 164 | \r |
| 165 | OpStart(op); Cycles=4;\r |
| 166 | \r |
| 167 | ot(";@ Get r10=EA r11=EA value\n");\r |
| 168 | EaCalc(10,0x003f, ea,size);\r |
| 169 | EaRead(10, 11, ea,size,1);\r |
| 170 | ot(";@ Get r0=Register r1=Register value\n");\r |
| 171 | EaCalc( 0,0x0e00,rea,size);\r |
| 172 | EaRead( 0, 1,rea,size,1);\r |
| 173 | \r |
| 174 | ot(";@ Do arithmetic:\n");\r |
| 175 | if (type==0) ot(" orr ");\r |
| 176 | if (type==1) ot(" subs ");\r |
| 177 | if (type==4) ot(" and ");\r |
| 178 | if (type==5) ot(" adds ");\r |
| 179 | if (dir) ot("r1,r11,r1\n");\r |
| 180 | else ot("r1,r1,r11\n");\r |
| 181 | \r |
| 182 | if ((type&1)==0) ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
| 183 | \r |
| 184 | OpGetFlags(type==1,type&1); // 1==subtract\r |
| 185 | ot("\n");\r |
| 186 | \r |
| 187 | ot(";@ Save result:\n");\r |
| 188 | if (dir) EaWrite(10, 1, ea,size,1);\r |
| 189 | else EaWrite( 0, 1,rea,size,1);\r |
| 190 | \r |
| 191 | if (size==1 && ea>=0x10) Cycles+=4;\r |
| 192 | if (size>=2) { if (ea<0x10) Cycles+=4; else Cycles+=2; }\r |
| 193 | \r |
| 194 | OpEnd();\r |
| 195 | \r |
| 196 | return 0;\r |
| 197 | }\r |
| 198 | \r |
| 199 | // --------------------- Opcodes 0x80c0+ ---------------------\r |
| 200 | int OpMul(int op)\r |
| 201 | {\r |
| 202 | // Div/Mul: 1m00nnns 11eeeeee (m=Mul, nnn=Register Dn, s=signed, eeeeee=EA)\r |
| 203 | int type=0,rea=0,sign=0,ea=0;\r |
| 204 | int use=0;\r |
| 205 | \r |
| 206 | type=(op>>14)&1; // div/mul\r |
| 207 | rea =(op>> 9)&7;\r |
| 208 | sign=(op>> 8)&1;\r |
| 209 | ea = op&0x3f;\r |
| 210 | \r |
| 211 | // See if we can do this opcode:\r |
| 212 | if (EaCanRead(ea,1)==0) return 1;\r |
| 213 | \r |
| 214 | use=OpBase(op);\r |
| 215 | use&=~0x0e00; // Use same for all registers\r |
| 216 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
| 217 | \r |
| 218 | OpStart(op); Cycles=type?70:133;\r |
| 219 | \r |
| 220 | EaCalc(10,0x003f, ea, 1);\r |
| 221 | EaRead(10, 10, ea, 1);\r |
| 222 | \r |
| 223 | EaCalc (0,0x0e00,rea, 2);\r |
| 224 | EaRead (0, 2,rea, 2);\r |
| 225 | \r |
| 226 | if (type==0)\r |
| 227 | {\r |
| 228 | ot(" cmp r10,#0\n");\r |
| 229 | ot(" moveq r10,#1 ;@ Divide by zero\n");\r |
| 230 | ot("\n");\r |
| 231 | \r |
| 232 | if (sign)\r |
| 233 | {\r |
| 234 | ot(" mov r11,#0 ;@ r11 = 1 if the result is negative\n");\r |
| 235 | ot(" eorlt r11,r11,#1\n");\r |
| 236 | ot(" rsblt r10,r10,#0 ;@ Make r10 positive\n");\r |
| 237 | ot("\n");\r |
| 238 | ot(" cmp r2,#0\n");\r |
| 239 | ot(" eorlt r11,r11,#1\n");\r |
| 240 | ot(" rsblt r2,r2,#0 ;@ Make r2 positive\n");\r |
| 241 | ot("\n");\r |
| 242 | }\r |
| 243 | \r |
| 244 | ot(";@ Divide r2 by r10\n");\r |
| 245 | ot(" mov r3,#0\n");\r |
| 246 | ot(" mov r1,r10\n");\r |
| 247 | ot("\n");\r |
| 248 | ot(";@ Shift up divisor till it's just less than numerator\n");\r |
| 249 | ot("Shift%.4x%s\n",op,ms?"":":");\r |
| 250 | ot(" cmp r1,r2,lsr #1\n");\r |
| 251 | ot(" movls r1,r1,lsl #1\n");\r |
| 252 | ot(" bcc Shift%.4x\n",op);\r |
| 253 | ot("\n");\r |
| 254 | \r |
| 255 | ot("Divide%.4x%s\n",op,ms?"":":");\r |
| 256 | ot(" cmp r2,r1\n");\r |
| 257 | ot(" adc r3,r3,r3 ;@ Double r3 and add 1 if carry set\n");\r |
| 258 | ot(" subcs r2,r2,r1\n");\r |
| 259 | ot(" teq r1,r10\n");\r |
| 260 | ot(" movne r1,r1,lsr #1\n");\r |
| 261 | ot(" bne Divide%.4x\n",op);\r |
| 262 | ot("\n");\r |
| 263 | \r |
| 264 | if (sign)\r |
| 265 | {\r |
| 266 | ot(" tst r11,r11\n");\r |
| 267 | ot(" rsbne r3,r3,#0 ;@ Negate if result is negative\n");\r |
| 268 | }\r |
| 269 | \r |
| 270 | ot(" mov r11,r2 ;@ Remainder\n");\r |
| 271 | \r |
| 272 | ot(" adds r1,r3,#0 ;@ Defines NZ, clears CV\n");\r |
| 273 | OpGetFlags(0,0);\r |
| 274 | \r |
| 275 | ot(" mov r1,r1,lsl #16 ;@ Clip to 16-bits\n");\r |
| 276 | ot(" mov r1,r1,lsr #16\n");\r |
| 277 | ot(" orr r1,r1,r11,lsl #16 ;@ Insert remainder\n");\r |
| 278 | }\r |
| 279 | \r |
| 280 | if (type==1)\r |
| 281 | {\r |
| 282 | char *shift="asr";\r |
| 283 | \r |
| 284 | ot(";@ Get 16-bit signs right:\n");\r |
| 285 | if (sign==0) { ot(" mov r10,r10,lsl #16\n"); shift="lsr"; }\r |
| 286 | ot(" mov r2,r2,lsl #16\n");\r |
| 287 | \r |
| 288 | if (sign==0) ot(" mov r10,r10,lsr #16\n");\r |
| 289 | ot(" mov r2,r2,%s #16\n",shift);\r |
| 290 | ot("\n");\r |
| 291 | \r |
| 292 | ot(" mul r1,r2,r10\n");\r |
| 293 | ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
| 294 | OpGetFlags(0,0);\r |
| 295 | \r |
| 296 | if (Amatch && ea==0x3c) Cycles-=4;\r |
| 297 | }\r |
| 298 | ot("\n");\r |
| 299 | \r |
| 300 | EaWrite(0, 1,rea, 2);\r |
| 301 | \r |
| 302 | \r |
| 303 | OpEnd();\r |
| 304 | \r |
| 305 | return 0;\r |
| 306 | }\r |
| 307 | \r |
| 308 | // Get X Bit into carry - trashes r2\r |
| 309 | static int GetXBit(int subtract)\r |
| 310 | {\r |
| 311 | ot(";@ Get X bit:\n");\r |
| 312 | ot(" ldrb r2,[r7,#0x45]\n");\r |
| 313 | if (subtract) ot(" mvn r2,r2,lsl #28 ;@ Invert it\n");\r |
| 314 | else ot(" mov r2,r2,lsl #28\n");\r |
| 315 | ot(" msr cpsr_flg,r2 ;@ Get into Carry\n");\r |
| 316 | ot("\n");\r |
| 317 | return 0;\r |
| 318 | }\r |
| 319 | \r |
| 320 | // --------------------- Opcodes 0x8100+ ---------------------\r |
| 321 | // 1t00ddd1 0000asss - sbcd/abcd Ds,Dd or -(As),-(Ad)\r |
| 322 | int OpAbcd(int op)\r |
| 323 | {\r |
| 324 | int use=0;\r |
| 325 | int type=0,sea=0,addr=0,dea=0;\r |
| 326 | \r |
| 327 | type=(op>>14)&1;\r |
| 328 | dea =(op>> 9)&7;\r |
| 329 | addr=(op>> 3)&1;\r |
| 330 | sea = op &7;\r |
| 331 | \r |
| 332 | if (addr) { sea|=0x20; dea|=0x20; }\r |
| 333 | \r |
| 334 | use=op&~0x0e07; // Use same opcode for all registers\r |
| 335 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
| 336 | \r |
| 337 | OpStart(op); Cycles=6;\r |
| 338 | \r |
| 339 | EaCalc( 0,0x0007, sea,0);\r |
| 340 | EaRead( 0, 10, sea,0,1);\r |
| 341 | EaCalc(11,0x0e00, dea,0);\r |
| 342 | EaRead(11, 1, dea,0,1);\r |
| 343 | \r |
| 344 | ot(" ldrb r2,[r7,#0x45] ;@ Get X bit\n");\r |
| 345 | ot(" tst r2,#2\n");\r |
| 346 | ot(" addne r10,r10,#0x01000000 ;@ Add carry bit\n");\r |
| 347 | \r |
| 348 | if (type)\r |
| 349 | {\r |
| 350 | ot(";@ Add units into r2:\n");\r |
| 351 | ot(" and r2,r1, #0x0f000000\n");\r |
| 352 | ot(" and r0,r10,#0x0f000000\n");\r |
| 353 | ot(" add r2,r2,r0\n");\r |
| 354 | ot(" cmp r2,#0x0a000000\n");\r |
| 355 | ot(" addpl r1,r1,#0x06000000 ;@ Decimal adjust units\n");\r |
| 356 | ot(" add r1,r1,r10 ;@ Add BCD\n");\r |
| 357 | ot(" mov r0,r1,lsr #24\n");\r |
| 358 | ot(" cmp r0,#0xa0\n");\r |
| 359 | ot(" addpl r1,r1,#0x60000000 ;@ Decimal adjust tens\n");\r |
| 360 | OpGetFlags(0,1);\r |
| 361 | }\r |
| 362 | else\r |
| 363 | {\r |
| 364 | ot(";@ Sub units into r2:\n");\r |
| 365 | ot(" and r2,r1, #0x0f000000\n");\r |
| 366 | ot(" and r0,r10,#0x0f000000\n");\r |
| 367 | ot(" subs r2,r2,r0\n");\r |
| 368 | ot(" submi r1,r1,#0x06000000 ;@ Decimal adjust units\n");\r |
| 369 | ot(" subs r1,r1,r10 ;@ Subtract BCD\n");\r |
| 370 | ot(" submis r1,r1,#0x60000000 ;@ Decimal adjust tens\n");\r |
| 371 | OpGetFlags(1,1);\r |
| 372 | }\r |
| 373 | ot("\n");\r |
| 374 | \r |
| 375 | EaWrite(11, 1, dea,0,1);\r |
| 376 | \r |
| 377 | OpEnd();\r |
| 378 | \r |
| 379 | return 0;\r |
| 380 | }\r |
| 381 | \r |
| 382 | // --------------------- Opcodes 0x90c0+ ---------------------\r |
| 383 | // Suba/Cmpa/Adda 1tt1nnnx 11eeeeee (tt=type, x=size, eeeeee=Source EA)\r |
| 384 | int OpAritha(int op)\r |
| 385 | {\r |
| 386 | int use=0;\r |
| 387 | int type=0,size=0,sea=0,dea=0;\r |
| 388 | \r |
| 389 | // Suba/Cmpa/Adda/(invalid):\r |
| 390 | type=(op>>13)&3; if (type>=3) return 1;\r |
| 391 | \r |
| 392 | size=(op>>8)&1; size++;\r |
| 393 | dea=(op>>9)&7; dea|=8; // Dest=An\r |
| 394 | sea=op&0x003f; // Source\r |
| 395 | \r |
| 396 | // See if we can do this opcode:\r |
| 397 | if (EaCanRead(sea,size)==0) return 1;\r |
| 398 | \r |
| 399 | use=OpBase(op);\r |
| 400 | use&=~0x0e00; // Use same opcode for An\r |
| 401 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
| 402 | \r |
| 403 | OpStart(op); Cycles=4;\r |
| 404 | EaCalc ( 0,0x003f, sea,size);\r |
| 405 | EaRead ( 0, 10, sea,size);\r |
| 406 | \r |
| 407 | EaCalc ( 0,0x0e00, dea,2);\r |
| 408 | EaRead ( 0, 1, dea,2);\r |
| 409 | \r |
| 410 | if (type==0) ot(" sub r1,r1,r10\n");\r |
| 411 | if (type==1) ot(" cmp r1,r10 ;@ Defines NZCV\n");\r |
| 412 | if (type==1) OpGetFlags(1,0); // Get Cmp flags\r |
| 413 | if (type==2) ot(" add r1,r1,r10\n");\r |
| 414 | ot("\n");\r |
| 415 | \r |
| 416 | EaWrite( 0, 1, dea,2);\r |
| 417 | \r |
| 418 | if (Amatch && sea==0x3c) Cycles-=size<2?4:8; // Correct?\r |
| 419 | if (size>=2) { if (sea<0x10) Cycles+=4; else Cycles+=2; }\r |
| 420 | \r |
| 421 | OpEnd();\r |
| 422 | \r |
| 423 | return 0;\r |
| 424 | }\r |
| 425 | \r |
| 426 | // --------------------- Opcodes 0x9100+ ---------------------\r |
| 427 | // Emit a Subx/Addx opcode, 1t01ddd1 zz000sss addx.z Ds,Dd\r |
| 428 | int OpAddx(int op)\r |
| 429 | {\r |
| 430 | int use=0;\r |
| 431 | int type=0,size=0,dea=0,sea=0;\r |
| 432 | \r |
| 433 | type=(op>>12)&5;\r |
| 434 | dea =(op>> 9)&7;\r |
| 435 | size=(op>> 6)&3; if (size>=3) return 1;\r |
| 436 | sea = op&0x3f;\r |
| 437 | \r |
| 438 | // See if we can do this opcode:\r |
| 439 | if (EaCanRead(sea,size)==0) return 1;\r |
| 440 | if (EaCanWrite(dea)==0) return 1;\r |
| 441 | \r |
| 442 | use=OpBase(op);\r |
| 443 | use&=~0x0e00; // Use same opcode for Dn\r |
| 444 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
| 445 | \r |
| 446 | OpStart(op); Cycles=8;\r |
| 447 | \r |
| 448 | ot(";@ Get r10=EA r11=EA value\n");\r |
| 449 | EaCalc( 0,0x003f,sea,size);\r |
| 450 | EaRead( 0, 11,sea,size,1);\r |
| 451 | ot(";@ Get r0=Register r1=Register value\n");\r |
| 452 | EaCalc( 0,0x0e00,dea,size);\r |
| 453 | EaRead( 0, 1,dea,size,1);\r |
| 454 | \r |
| 455 | ot(";@ Do arithmetic:\n");\r |
| 456 | GetXBit(type==1);\r |
| 457 | \r |
| 458 | if (type==5 && size<2)\r |
| 459 | {\r |
| 460 | ot(";@ Make sure the carry bit will tip the balance:\n");\r |
| 461 | if (size==0) ot(" ldr r2,=0x00ffffff\n");\r |
| 462 | else ot(" ldr r2,=0x0000ffff\n");\r |
| 463 | ot(" orr r11,r11,r2\n");\r |
| 464 | ot("\n");\r |
| 465 | }\r |
| 466 | \r |
| 467 | if (type==1) ot(" sbcs r1,r1,r11\n");\r |
| 468 | if (type==5) ot(" adcs r1,r1,r11\n");\r |
| 469 | OpGetFlags(type==1,1); // subtract\r |
| 470 | ot("\n");\r |
| 471 | \r |
| 472 | ot(";@ Save result:\n");\r |
| 473 | EaWrite( 0, 1, dea,size,1);\r |
| 474 | \r |
| 475 | OpEnd();\r |
| 476 | \r |
| 477 | return 0;\r |
| 478 | }\r |
| 479 | \r |
| 480 | // --------------------- Opcodes 0xb000+ ---------------------\r |
| 481 | // Emit a Cmp/Eor opcode, 1011rrrt xxeeeeee (rrr=Dn, t=cmp/eor, xx=size extension, eeeeee=ea)\r |
| 482 | int OpCmpEor(int op)\r |
| 483 | {\r |
| 484 | int rea=0,eor=0;\r |
| 485 | int size=0,ea=0,use=0;\r |
| 486 | \r |
| 487 | // Get EA and register EA\r |
| 488 | rea=(op>>9)&7;\r |
| 489 | eor=(op>>8)&1;\r |
| 490 | size=(op>>6)&3; if (size>=3) return 1;\r |
| 491 | ea=op&0x3f;\r |
| 492 | \r |
| 493 | // See if we can do this opcode:\r |
| 494 | if (EaCanRead(ea,size)==0) return 1;\r |
| 495 | if (eor && EaCanWrite(ea)==0) return 1;\r |
| 496 | \r |
| 497 | use=OpBase(op);\r |
| 498 | use&=~0x0e00; // Use 1 handler for register d0-7\r |
| 499 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
| 500 | \r |
| 501 | OpStart(op); Cycles=eor?8:4;\r |
| 502 | \r |
| 503 | ot(";@ Get EA into r10 and value into r0:\n");\r |
| 504 | EaCalc (10,0x003f, ea,size);\r |
| 505 | EaRead (10, 0, ea,size,1);\r |
| 506 | \r |
| 507 | ot(";@ Get register operand into r1:\n");\r |
| 508 | EaCalc (1 ,0x0e00, rea,size);\r |
| 509 | EaRead (1, 1, rea,size,1);\r |
| 510 | \r |
| 511 | ot(";@ Do arithmetic:\n");\r |
| 512 | if (eor==0) ot(" cmp r1,r0\n");\r |
| 513 | if (eor)\r |
| 514 | {\r |
| 515 | ot(" eor r1,r0,r1\n");\r |
| 516 | ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
| 517 | }\r |
| 518 | \r |
| 519 | OpGetFlags(eor==0,0); // Cmp like subtract\r |
| 520 | ot("\n");\r |
| 521 | \r |
| 522 | if (size>=2) Cycles+=4; // Correct?\r |
| 523 | if (ea==0x3c) Cycles-=4;\r |
| 524 | \r |
| 525 | if (eor) EaWrite(10, 1,ea,size,1);\r |
| 526 | \r |
| 527 | OpEnd();\r |
| 528 | return 0;\r |
| 529 | }\r |
| 530 | \r |