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cyclone_debug improvements pt. 2
[picodrive.git] / cpu / Cyclone / OpArith.cpp
CommitLineData
cc68a136 1\r
2#include "app.h"\r
3\r
4// --------------------- Opcodes 0x0000+ ---------------------\r
5// Emit an Ori/And/Sub/Add/Eor/Cmp Immediate opcode, 0000ttt0 ssaaaaaa\r
6int OpArith(int op)\r
7{\r
8 int type=0,size=0;\r
9 int sea=0,tea=0;\r
10 int use=0;\r
b637c56a 11 char *shiftstr="";\r
cc68a136 12\r
13 // Get source and target EA\r
14 type=(op>>9)&7; if (type==4 || type>=7) return 1;\r
15 size=(op>>6)&3; if (size>=3) return 1;\r
16 sea= 0x003c;\r
17 tea=op&0x003f;\r
18\r
19 // See if we can do this opcode:\r
20 if (EaCanRead(tea,size)==0) return 1;\r
21 if (EaCanWrite(tea)==0 || EaAn(tea)) return 1;\r
22\r
85a36a57 23 use=OpBase(op,size);\r
cc68a136 24 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
25\r
cfb3dfa0 26 OpStart(op, sea, tea); Cycles=4;\r
cc68a136 27\r
03c5768c 28 // imm must be read first\r
85a36a57 29 EaCalcReadNoSE(-1,10,sea,size,0);\r
03c5768c 30 EaCalcReadNoSE((type!=6)?11:-1,0,tea,size,0x003f);\r
cc68a136 31\r
85a36a57 32 if (size<2) shiftstr=(char *)(size?",asl #16":",asl #24");\r
03c5768c 33 if (size<2) ot(" mov r10,r10,asl #%i\n",size?16:24);\r
b637c56a 34\r
cc68a136 35 ot(";@ Do arithmetic:\n");\r
36\r
03c5768c 37 if (type==0) ot(" orr r1,r10,r0%s\n",shiftstr);\r
38 if (type==1) ot(" and r1,r10,r0%s\n",shiftstr);\r
39 if (type==2||type==6)\r
40 ot(" rsbs r1,r10,r0%s ;@ Defines NZCV\n",shiftstr);\r
41 if (type==3) ot(" adds r1,r10,r0%s ;@ Defines NZCV\n",shiftstr);\r
42 if (type==5) ot(" eor r1,r10,r0%s\n",shiftstr);\r
cc68a136 43\r
44 if (type<2 || type==5) ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n"); // 0,1,5\r
45\r
46 if (type< 2) OpGetFlags(0,0); // Ori/And\r
47 if (type==2) OpGetFlags(1,1); // Sub: Subtract/X-bit\r
48 if (type==3) OpGetFlags(0,1); // Add: X-bit\r
49 if (type==5) OpGetFlags(0,0); // Eor\r
50 if (type==6) OpGetFlags(1,0); // Cmp: Subtract\r
51 ot("\n");\r
52\r
53 if (type!=6)\r
54 {\r
55 EaWrite(11, 1, tea,size,0x003f,1);\r
56 }\r
57\r
58 // Correct cycles:\r
59 if (type==6)\r
60 {\r
61 if (size>=2 && tea<0x10) Cycles+=2;\r
62 }\r
63 else\r
64 {\r
65 if (size>=2) Cycles+=4;\r
66 if (tea>=8) Cycles+=4;\r
67 if (type==1 && size>=2 && tea<8) Cycles-=2;\r
68 }\r
69\r
cfb3dfa0 70 OpEnd(sea,tea);\r
cc68a136 71\r
72 return 0;\r
73}\r
74\r
75// --------------------- Opcodes 0x5000+ ---------------------\r
76int OpAddq(int op)\r
77{\r
78 // 0101nnnt xxeeeeee (nnn=#8,1-7 t=addq/subq xx=size, eeeeee=EA)\r
79 int num=0,type=0,size=0,ea=0;\r
80 int use=0;\r
81 char count[16]="";\r
82 int shift=0;\r
83\r
84 num =(op>>9)&7; if (num==0) num=8;\r
85 type=(op>>8)&1;\r
86 size=(op>>6)&3; if (size>=3) return 1;\r
87 ea = op&0x3f;\r
88\r
89 // See if we can do this opcode:\r
90 if (EaCanRead (ea,size)==0) return 1;\r
91 if (EaCanWrite(ea) ==0) return 1;\r
92 if (size == 0 && EaAn(ea) ) return 1;\r
93\r
85a36a57 94 use=OpBase(op,size,1);\r
cc68a136 95\r
96 if (num!=8) use|=0x0e00; // If num is not 8, use same handler\r
97 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
98\r
a6785576 99 OpStart(op,ea);\r
cc68a136 100 Cycles=ea<8?4:8;\r
101 if(type==0&&size==1) Cycles=ea<0x10?4:8;\r
102 if(size>=2) Cycles=ea<0x10?8:12;\r
103\r
104 if (size>0 && (ea&0x38)==0x08) size=2; // addq.w #n,An is also 32-bit\r
105\r
85a36a57 106 EaCalcReadNoSE(10,0,ea,size,0x003f);\r
cc68a136 107\r
108 shift=32-(8<<size);\r
109\r
110 if (num!=8)\r
111 {\r
112 int lsr=9-shift;\r
113\r
3a5e6cf8 114 ot(" and r2,r8,#0x0e00 ;@ Get quick value\n");\r
115\r
116 if (lsr>=0) sprintf(count,"r2,lsr #%d", lsr);\r
117 else sprintf(count,"r2,lsl #%d", -lsr);\r
cc68a136 118\r
cc68a136 119 ot("\n");\r
cc68a136 120 }\r
3a5e6cf8 121 else\r
122 {\r
123 sprintf(count,"#0x%.4x",8<<shift);\r
124 }\r
cc68a136 125\r
85a36a57 126 if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);\r
127\r
cc68a136 128 if (type==0) ot(" adds r1,r0,%s\n",count);\r
129 if (type==1) ot(" subs r1,r0,%s\n",count);\r
130\r
131 if ((ea&0x38)!=0x08) OpGetFlags(type,1);\r
132 ot("\n");\r
133\r
134 EaWrite(10, 1, ea,size,0x003f,1);\r
135\r
cfb3dfa0 136 OpEnd(ea);\r
cc68a136 137\r
138 return 0;\r
139}\r
140\r
141// --------------------- Opcodes 0x8000+ ---------------------\r
142// 1t0tnnnd xxeeeeee (tt=type:or/sub/and/add xx=size, eeeeee=EA)\r
143int OpArithReg(int op)\r
144{\r
145 int use=0;\r
146 int type=0,size=0,dir=0,rea=0,ea=0;\r
85a36a57 147 char *asl="";\r
148 char *strop=0;\r
cc68a136 149\r
150 type=(op>>12)&5;\r
151 rea =(op>> 9)&7;\r
152 dir =(op>> 8)&1; // er,re\r
153 size=(op>> 6)&3; if (size>=3) return 1;\r
154 ea = op&0x3f;\r
155\r
156 if (dir && ea<0x10) return 1; // addx/subx opcode\r
157\r
158 // See if we can do this opcode:\r
159 if (dir==0 && EaCanRead (ea,size)==0) return 1;\r
160 if (dir && EaCanWrite(ea)==0) return 1;\r
161 if ((size==0||!(type&1))&&EaAn(ea)) return 1;\r
162\r
85a36a57 163 use=OpBase(op,size);\r
cc68a136 164 use&=~0x0e00; // Use same opcode for Dn\r
165 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
166\r
a6785576 167 OpStart(op,ea); Cycles=4;\r
cc68a136 168\r
85a36a57 169 EaCalcReadNoSE(dir?10:-1,0,ea,size,0x003f);\r
170\r
171 EaCalcReadNoSE(dir?-1:10,1,rea,size,0x0e00);\r
cc68a136 172\r
173 ot(";@ Do arithmetic:\n");\r
85a36a57 174 if (type==0) strop = "orr";\r
175 if (type==1) strop = (char *) (dir ? "subs" : "rsbs");\r
176 if (type==4) strop = "and";\r
177 if (type==5) strop = "adds";\r
178\r
179 if (size==0) asl=",asl #24";\r
180 if (size==1) asl=",asl #16";\r
181\r
182 if (size<2) ot(" mov r0,r0%s\n",asl);\r
183 ot(" %s r1,r0,r1%s\n",strop,asl);\r
cc68a136 184\r
185 if ((type&1)==0) ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r
186\r
187 OpGetFlags(type==1,type&1); // 1==subtract\r
188 ot("\n");\r
189\r
190 ot(";@ Save result:\n");\r
85a36a57 191 if (size<2) ot(" mov r1,r1,asr #%d\n",size?16:24);\r
192 if (dir) EaWrite(10, 1, ea,size,0x003f,0,0);\r
193 else EaWrite(10, 1,rea,size,0x0e00,0,0);\r
cc68a136 194\r
195 if(rea==ea) {\r
196 if(ea<8) Cycles=(size>=2)?8:4; else Cycles+=(size>=2)?26:14;\r
197 } else if(dir) {\r
198 Cycles+=4;\r
199 if(size>=2) Cycles+=4;\r
200 } else {\r
201 if(size>=2) {\r
a6785576 202 Cycles+=2;\r
203 if(ea<0x10||ea==0x3c) Cycles+=2;\r
204 }\r
cc68a136 205 }\r
206\r
cfb3dfa0 207 OpEnd(ea);\r
cc68a136 208\r
209 return 0;\r
210}\r
211\r
212// --------------------- Opcodes 0x80c0+ ---------------------\r
213int OpMul(int op)\r
214{\r
215 // Div/Mul: 1m00nnns 11eeeeee (m=Mul, nnn=Register Dn, s=signed, eeeeee=EA)\r
216 int type=0,rea=0,sign=0,ea=0;\r
217 int use=0;\r
218\r
219 type=(op>>14)&1; // div/mul\r
220 rea =(op>> 9)&7;\r
221 sign=(op>> 8)&1;\r
222 ea = op&0x3f;\r
223\r
224 // See if we can do this opcode:\r
225 if (EaCanRead(ea,1)==0||EaAn(ea)) return 1;\r
226\r
85a36a57 227 use=OpBase(op,1);\r
cc68a136 228 use&=~0x0e00; // Use same for all registers\r
229 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
230\r
a6785576 231 OpStart(op,ea);\r
cc68a136 232 if(type) Cycles=54;\r
233 else Cycles=sign?158:140;\r
234\r
85a36a57 235 EaCalcReadNoSE(-1,0,ea,1,0x003f);\r
236\r
237 EaCalc(10,0x0e00,rea, 2);\r
238 EaRead(10, 2,rea, 2,0x0e00);\r
cc68a136 239\r
85a36a57 240 ot(" movs r0,r0,asl #16\n");\r
cc68a136 241\r
242 if (type==0) // div\r
243 {\r
244 // the manual says C is always cleared, but neither Musashi nor FAME do that\r
245 //ot(" bic r9,r9,#0x20000000 ;@ always clear C\n");\r
cc68a136 246 ot(" beq divzero%.4x ;@ division by zero\n",op);\r
247 ot("\n");\r
248 \r
249 if (sign)\r
250 {\r
251 ot(" mov r11,#0 ;@ r11 = 1 or 2 if the result is negative\n");\r
252 ot(" orrmi r11,r11,#1\n");\r
85a36a57 253 ot(" mov r0,r0,asr #16\n");\r
254 ot(" rsbmi r0,r0,#0 ;@ Make r0 positive\n");\r
cc68a136 255 ot("\n");\r
256 ot(" tst r2,r2\n");\r
257 ot(" orrmi r11,r11,#2\n");\r
258 ot(" rsbmi r2,r2,#0 ;@ Make r2 positive\n");\r
259 ot("\n");\r
260 }\r
261 else\r
a6785576 262 {\r
85a36a57 263 ot(" mov r0,r0,lsr #16 ;@ use only 16 bits of divisor\n");\r
a6785576 264 }\r
cc68a136 265\r
85a36a57 266 ot(";@ Divide r2 by r0\n");\r
cc68a136 267 ot(" mov r3,#0\n");\r
85a36a57 268 ot(" mov r1,r0\n");\r
cc68a136 269 ot("\n");\r
270 ot(";@ Shift up divisor till it's just less than numerator\n");\r
271 ot("Shift%.4x%s\n",op,ms?"":":");\r
272 ot(" cmp r1,r2,lsr #1\n");\r
273 ot(" movls r1,r1,lsl #1\n");\r
274 ot(" bcc Shift%.4x\n",op);\r
275 ot("\n");\r
276\r
277 ot("Divide%.4x%s\n",op,ms?"":":");\r
278 ot(" cmp r2,r1\n");\r
279 ot(" adc r3,r3,r3 ;@ Double r3 and add 1 if carry set\n");\r
280 ot(" subcs r2,r2,r1\n");\r
85a36a57 281 ot(" teq r1,r0\n");\r
cc68a136 282 ot(" movne r1,r1,lsr #1\n");\r
283 ot(" bne Divide%.4x\n",op);\r
284 ot("\n");\r
285 ot(";@r3==quotient,r2==remainder\n");\r
286\r
287 if (sign)\r
288 {\r
a6785576 289 // sign correction\r
cc68a136 290 ot(" and r1,r11,#1\n");\r
291 ot(" teq r1,r11,lsr #1\n");\r
292 ot(" rsbne r3,r3,#0 ;@ negate if quotient is negative\n");\r
293 ot(" tst r11,#2\n");\r
294 ot(" rsbne r2,r2,#0 ;@ negate the remainder if divident was negative\n");\r
295 ot("\n");\r
296\r
a6785576 297 // signed overflow check\r
298 ot(" mov r1,r3,asl #16\n");\r
299 ot(" cmp r3,r1,asr #16 ;@ signed overflow?\n");\r
cc68a136 300 ot(" orrne r9,r9,#0x10000000 ;@ set overflow flag\n");\r
301 ot(" bne endofop%.4x ;@ overflow!\n",op);\r
302 }\r
a6785576 303 else\r
304 {\r
305 // overflow check\r
306 ot(" movs r1,r3,lsr #16 ;@ check for overflow condition\n");\r
cc68a136 307 ot(" orrne r9,r9,#0x10000000 ;@ set overflow flag\n");\r
308 ot(" bne endofop%.4x ;@ overflow!\n",op);\r
a6785576 309 }\r
cc68a136 310\r
311 ot(" mov r1,r3,lsl #16 ;@ Clip to 16-bits\n");\r
312 ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r
313 OpGetFlags(0,0);\r
314\r
315 ot(" mov r1,r1,lsr #16\n");\r
316 ot(" orr r1,r1,r2,lsl #16 ;@ Insert remainder\n");\r
317 }\r
318\r
319 if (type==1)\r
320 {\r
cc68a136 321 ot(";@ Get 16-bit signs right:\n");\r
85a36a57 322 ot(" mov r0,r0,%s #16\n",sign?"asr":"lsr");\r
cc68a136 323 ot(" mov r2,r2,lsl #16\n");\r
85a36a57 324 ot(" mov r2,r2,%s #16\n",sign?"asr":"lsr");\r
cc68a136 325 ot("\n");\r
326\r
85a36a57 327 ot(" mul r1,r2,r0\n");\r
cc68a136 328 ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r
329 OpGetFlags(0,0);\r
330 }\r
331 ot("\n");\r
332\r
85a36a57 333 EaWrite(10, 1,rea, 2,0x0e00,1);\r
cc68a136 334\r
85a36a57 335 if (type==0) ot("endofop%.4x%s\n",op,ms?"":":");\r
cfb3dfa0 336 OpEnd(ea);\r
cc68a136 337\r
85a36a57 338 if (type==0) // div\r
339 {\r
340 ot("divzero%.4x%s\n",op,ms?"":":");\r
341 ot(" mov r0,#0x14 ;@ Divide by zero\n");\r
342 ot(" bl Exception\n");\r
343 Cycles+=38;\r
344 OpEnd(ea);\r
345 ot("\n");\r
346 }\r
cc68a136 347\r
348 return 0;\r
349}\r
350\r
351// Get X Bit into carry - trashes r2\r
352int GetXBit(int subtract)\r
353{\r
354 ot(";@ Get X bit:\n");\r
85a36a57 355 ot(" ldr r2,[r7,#0x4c]\n");\r
356 if (subtract) ot(" mvn r2,r2 ;@ Invert it\n");\r
cc68a136 357 ot(" msr cpsr_flg,r2 ;@ Get into Carry\n");\r
358 ot("\n");\r
359 return 0;\r
360}\r
361\r
362// --------------------- Opcodes 0x8100+ ---------------------\r
363// 1t00ddd1 0000asss - sbcd/abcd Ds,Dd or -(As),-(Ad)\r
364int OpAbcd(int op)\r
365{\r
366 int use=0;\r
85a36a57 367 int type=0,sea=0,mem=0,dea=0;\r
cc68a136 368 \r
369 type=(op>>14)&1; // sbcd/abcd\r
370 dea =(op>> 9)&7;\r
85a36a57 371 mem =(op>> 3)&1;\r
cc68a136 372 sea = op &7;\r
373\r
85a36a57 374 if (mem) { sea|=0x20; dea|=0x20; }\r
cc68a136 375\r
376 use=op&~0x0e07; // Use same opcode for all registers..\r
85a36a57 377 if (sea==0x27) use|=0x0007; // ___x.b -(a7)\r
378 if (dea==0x27) use|=0x0e00; // ___x.b -(a7)\r
cc68a136 379 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
380\r
cfb3dfa0 381 OpStart(op,sea,dea); Cycles=6;\r
cc68a136 382\r
85a36a57 383 if (mem)\r
384 {\r
385 ot(";@ Get src/dest EA vals\n");\r
386 EaCalc (0,0x000f, sea,0,1);\r
387 EaRead (0, 10, sea,0,0x000f,1);\r
03c5768c 388 EaCalcReadNoSE(11,0,dea,0,0x0e00);\r
85a36a57 389 }\r
390 else\r
391 {\r
392 ot(";@ Get src/dest reg vals\n");\r
393 EaCalcReadNoSE(-1,10,sea,0,0x0007);\r
394 EaCalcReadNoSE(11,0,dea,0,0x0e00);\r
395 ot(" mov r10,r10,asl #24\n");\r
396 }\r
397 ot(" mov r1,r0,asl #24\n\n");\r
cc68a136 398\r
399 ot(" bic r9,r9,#0xb1000000 ;@ clear all flags except old Z\n");\r
400\r
401 if (type)\r
402 {\r
85a36a57 403 ot(" ldr r0,[r7,#0x4c] ;@ Get X bit\n");\r
cc68a136 404 ot(" mov r3,#0x00f00000\n");\r
405 ot(" and r2,r3,r1,lsr #4\n");\r
85a36a57 406 ot(" tst r0,#0x20000000\n");\r
cc68a136 407 ot(" and r0,r3,r10,lsr #4\n");\r
408 ot(" add r0,r0,r2\n");\r
409 ot(" addne r0,r0,#0x00100000\n");\r
410// ot(" tst r0,#0x00800000\n");\r
411// ot(" orreq r9,r9,#0x01000000 ;@ Undefined V behavior\n");\r
412 ot(" cmp r0,#0x00900000\n");\r
413 ot(" addhi r0,r0,#0x00600000 ;@ Decimal adjust units\n");\r
414\r
415 ot(" mov r2,r1,lsr #28\n");\r
416 ot(" add r0,r0,r2,lsl #24\n");\r
417 ot(" mov r2,r10,lsr #28\n");\r
418 ot(" add r0,r0,r2,lsl #24\n");\r
419 ot(" cmp r0,#0x09900000\n");\r
a6785576 420 ot(" orrhi r9,r9,#0x20000000 ;@ C\n");\r
421 ot(" subhi r0,r0,#0x0a000000\n");\r
422// ot(" and r3,r9,r0,lsr #3 ;@ Undefined V behavior part II\n");\r
423// ot(" orr r9,r9,r3,lsl #4 ;@ V\n");\r
cc68a136 424 ot(" movs r0,r0,lsl #4\n");\r
a6785576 425 ot(" orrmi r9,r9,#0x90000000 ;@ Undefined N+V behavior\n"); // this is what Musashi really does\r
426 ot(" bicne r9,r9,#0x40000000 ;@ Z flag\n");\r
cc68a136 427 }\r
428 else\r
429 {\r
85a36a57 430 ot(" ldr r0,[r7,#0x4c] ;@ Get X bit\n");\r
cc68a136 431 ot(" mov r3,#0x00f00000\n");\r
432 ot(" and r2,r3,r10,lsr #4\n");\r
85a36a57 433 ot(" tst r0,#0x20000000\n");\r
cc68a136 434 ot(" and r0,r3,r1,lsr #4\n");\r
435 ot(" sub r0,r0,r2\n");\r
436 ot(" subne r0,r0,#0x00100000\n");\r
437// ot(" tst r0,#0x00800000\n");\r
438// ot(" orreq r9,r9,#0x01000000 ;@ Undefined V behavior\n");\r
439 ot(" cmp r0,#0x00900000\n");\r
440 ot(" subhi r0,r0,#0x00600000 ;@ Decimal adjust units\n");\r
441\r
442 ot(" mov r2,r1,lsr #28\n");\r
443 ot(" add r0,r0,r2,lsl #24\n");\r
444 ot(" mov r2,r10,lsr #28\n");\r
445 ot(" sub r0,r0,r2,lsl #24\n");\r
446 ot(" cmp r0,#0x09900000\n");\r
a6785576 447 ot(" orrhi r9,r9,#0xa0000000 ;@ N and C\n");\r
448 ot(" addhi r0,r0,#0x0a000000\n");\r
449// ot(" and r3,r9,r0,lsr #3 ;@ Undefined V behavior part II\n");\r
450// ot(" orr r9,r9,r3,lsl #4 ;@ V\n");\r
cc68a136 451 ot(" movs r0,r0,lsl #4\n");\r
a6785576 452// ot(" orrmi r9,r9,#0x80000000 ;@ Undefined N behavior\n");\r
453 ot(" bicne r9,r9,#0x40000000 ;@ Z flag\n");\r
cc68a136 454 }\r
455\r
85a36a57 456 ot(" str r9,[r7,#0x4c] ;@ Save X bit\n");\r
457 ot("\n");\r
cc68a136 458\r
459 EaWrite(11, 0, dea,0,0x0e00,1);\r
cfb3dfa0 460 OpEnd(sea,dea);\r
cc68a136 461\r
462 return 0;\r
463}\r
464\r
85a36a57 465// 01001000 00eeeeee - nbcd <ea>\r
cc68a136 466int OpNbcd(int op)\r
467{\r
468 int use=0;\r
469 int ea=0;\r
470 \r
471 ea=op&0x3f;\r
472\r
473 if(EaCanWrite(ea)==0||EaAn(ea)) return 1;\r
474\r
85a36a57 475 use=OpBase(op,0);\r
cc68a136 476 if(op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
477\r
a6785576 478 OpStart(op,ea); Cycles=6;\r
cc68a136 479 if(ea >= 8) Cycles+=2;\r
480\r
85a36a57 481 EaCalcReadNoSE(10,0,ea,0,0x003f);\r
cc68a136 482\r
483 // this is rewrite of Musashi's code\r
85a36a57 484 ot(" ldr r2,[r7,#0x4c]\n");\r
485 ot(" bic r9,r9,#0xb0000000 ;@ clear all flags, except Z\n");\r
486 ot(" mov r0,r0,asl #24\n");\r
487 ot(" and r2,r2,#0x20000000\n");\r
488 ot(" add r2,r0,r2,lsr #5 ;@ add X\n");\r
cc68a136 489 ot(" rsbs r1,r2,#0x9a000000 ;@ do arithmetic\n");\r
490\r
cc68a136 491 ot(" orrmi r9,r9,#0x80000000 ;@ N\n");\r
492 ot(" cmp r1,#0x9a000000\n");\r
493 ot(" beq finish%.4x\n",op);\r
494 ot("\n");\r
495\r
496 ot(" mvn r3,r9,lsr #3 ;@ Undefined V behavior\n",op);\r
497 ot(" and r2,r1,#0x0f000000\n");\r
498 ot(" cmp r2,#0x0a000000\n");\r
499 ot(" andeq r1,r1,#0xf0000000\n");\r
500 ot(" addeq r1,r1,#0x10000000\n");\r
501 ot(" and r3,r3,r1,lsr #3 ;@ Undefined V behavior part II\n",op);\r
502 ot(" tst r1,r1\n");\r
503 ot(" orr r9,r9,r3 ;@ save V\n",op);\r
504 ot(" bicne r9,r9,#0x40000000 ;@ Z\n");\r
505 ot(" orr r9,r9,#0x20000000 ;@ C\n");\r
506 ot("\n");\r
507\r
508 EaWrite(10, 1, ea,0,0x3f,1);\r
509\r
510 ot("finish%.4x%s\n",op,ms?"":":");\r
85a36a57 511 ot(" str r9,[r7,#0x4c] ;@ Save X\n");\r
cc68a136 512\r
cfb3dfa0 513 OpEnd(ea);\r
cc68a136 514\r
515 return 0;\r
516}\r
517\r
518// --------------------- Opcodes 0x90c0+ ---------------------\r
519// Suba/Cmpa/Adda 1tt1nnnx 11eeeeee (tt=type, x=size, eeeeee=Source EA)\r
520int OpAritha(int op)\r
521{\r
522 int use=0;\r
523 int type=0,size=0,sea=0,dea=0;\r
85a36a57 524 char *asr="";\r
cc68a136 525\r
526 // Suba/Cmpa/Adda/(invalid):\r
527 type=(op>>13)&3; if (type>=3) return 1;\r
528\r
529 size=(op>>8)&1; size++;\r
530 dea=(op>>9)&7; dea|=8; // Dest=An\r
531 sea=op&0x003f; // Source\r
532\r
533 // See if we can do this opcode:\r
534 if (EaCanRead(sea,size)==0) return 1;\r
535\r
85a36a57 536 use=OpBase(op,size);\r
cc68a136 537 use&=~0x0e00; // Use same opcode for An\r
538 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
539\r
a6785576 540 OpStart(op,sea); Cycles=(size==2)?6:8;\r
cc68a136 541 if(size==2&&(sea<0x10||sea==0x3c)) Cycles+=2;\r
542 if(type==1) Cycles=6;\r
543\r
03c5768c 544 // to handle suba.w (A0)+, A0 properly, must calc reg EA first\r
545 EaCalcReadNoSE(type!=1?10:-1,11,dea,2,0x0e00);\r
546 EaCalcReadNoSE(-1,0,sea,size,0x003f);\r
cc68a136 547\r
03c5768c 548 if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);\r
85a36a57 549 if (size<2) asr=(char *)(size?",asr #16":",asr #24");\r
cc68a136 550\r
85a36a57 551 if (type==0) ot(" sub r11,r11,r0%s\n",asr);\r
552 if (type==1) ot(" cmp r11,r0%s ;@ Defines NZCV\n",asr);\r
cc68a136 553 if (type==1) OpGetFlags(1,0); // Get Cmp flags\r
85a36a57 554 if (type==2) ot(" add r11,r11,r0%s\n",asr);\r
cc68a136 555 ot("\n");\r
556 \r
03c5768c 557 if (type!=1) EaWrite(10, 11, dea,2,0x0e00);\r
cc68a136 558\r
cfb3dfa0 559 OpEnd(sea);\r
cc68a136 560\r
561 return 0;\r
562}\r
563\r
564// --------------------- Opcodes 0x9100+ ---------------------\r
565// Emit a Subx/Addx opcode, 1t01ddd1 zz00rsss addx.z Ds,Dd\r
566int OpAddx(int op)\r
567{\r
568 int use=0;\r
569 int type=0,size=0,dea=0,sea=0,mem=0;\r
85a36a57 570 char *asl="";\r
cc68a136 571\r
85a36a57 572 type=(op>>14)&1;\r
cc68a136 573 dea =(op>> 9)&7;\r
574 size=(op>> 6)&3; if (size>=3) return 1;\r
575 sea = op&7;\r
576 mem =(op>> 3)&1;\r
577\r
578 // See if we can do this opcode:\r
579 if (EaCanRead(sea,size)==0) return 1;\r
580 if (EaCanWrite(dea)==0) return 1;\r
581\r
582 if(mem) { sea+=0x20; dea+=0x20; }\r
583\r
584 use=op&~0x0e07; // Use same opcode for Dn\r
85a36a57 585 if (size==0&&sea==0x27) use|=0x0007; // ___x.b -(a7)\r
586 if (size==0&&dea==0x27) use|=0x0e00; // ___x.b -(a7)\r
cc68a136 587 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
588\r
cfb3dfa0 589 OpStart(op,sea,dea); Cycles=4;\r
cc68a136 590 if(size>=2) Cycles+=4;\r
591 if(sea>=0x10) Cycles+=2;\r
592\r
85a36a57 593 if (mem)\r
594 {\r
595 ot(";@ Get src/dest EA vals\n");\r
596 EaCalc (0,0x000f, sea,size,1);\r
597 EaRead (0, 11, sea,size,0x000f,1);\r
03c5768c 598 EaCalcReadNoSE(10,0,dea,size,0x0e00);\r
85a36a57 599 }\r
600 else\r
601 {\r
602 ot(";@ Get src/dest reg vals\n");\r
603 EaCalcReadNoSE(-1,11,sea,size,0x0007);\r
604 EaCalcReadNoSE(10,0,dea,size,0x0e00);\r
605 if (size<2) ot(" mov r11,r11,asl #%d\n\n",size?16:24);\r
606 }\r
607\r
608 if (size<2) asl=(char *)(size?",asl #16":",asl #24");\r
cc68a136 609\r
610 ot(";@ Do arithmetic:\n");\r
85a36a57 611 GetXBit(type==0);\r
cc68a136 612\r
85a36a57 613 if (type==1 && size<2)\r
cc68a136 614 {\r
615 ot(";@ Make sure the carry bit will tip the balance:\n");\r
a6785576 616 ot(" mvn r2,#0\n");\r
cc68a136 617 ot(" orr r11,r11,r2,lsr #%i\n",(size==0)?8:16);\r
618 ot("\n");\r
619 }\r
620\r
85a36a57 621 if (type==0) ot(" rscs r1,r11,r0%s\n",asl);\r
622 if (type==1) ot(" adcs r1,r11,r0%s\n",asl);\r
cc68a136 623 ot(" orr r3,r9,#0xb0000000 ;@ for old Z\n");\r
85a36a57 624 OpGetFlags(type==0,1,0); // subtract\r
cc68a136 625 if (size<2) {\r
626 ot(" movs r2,r1,lsr #%i\n", size?16:24);\r
627 ot(" orreq r9,r9,#0x40000000 ;@ add potentially missed Z\n");\r
628 }\r
629 ot(" andeq r9,r9,r3 ;@ fix Z\n");\r
630 ot("\n");\r
631\r
632 ot(";@ Save result:\n");\r
85a36a57 633 EaWrite(10, 1, dea,size,0x0e00,1);\r
cc68a136 634\r
cfb3dfa0 635 OpEnd(sea,dea);\r
cc68a136 636\r
637 return 0;\r
638}\r
639\r
640// --------------------- Opcodes 0xb000+ ---------------------\r
641// Emit a Cmp/Eor opcode, 1011rrrt xxeeeeee (rrr=Dn, t=cmp/eor, xx=size extension, eeeeee=ea)\r
642int OpCmpEor(int op)\r
643{\r
644 int rea=0,eor=0;\r
645 int size=0,ea=0,use=0;\r
85a36a57 646 char *asl="";\r
cc68a136 647\r
648 // Get EA and register EA\r
649 rea=(op>>9)&7;\r
650 eor=(op>>8)&1;\r
651 size=(op>>6)&3; if (size>=3) return 1;\r
652 ea=op&0x3f;\r
653\r
654 if (eor && (ea>>3) == 1) return 1; // not a valid mode for eor\r
655\r
656 // See if we can do this opcode:\r
657 if (EaCanRead(ea,size)==0) return 1;\r
658 if (eor && EaCanWrite(ea)==0) return 1;\r
659 if (EaAn(ea)&&(eor||size==0)) return 1;\r
660\r
85a36a57 661 use=OpBase(op,size);\r
cc68a136 662 use&=~0x0e00; // Use 1 handler for register d0-7\r
663 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
664\r
a6785576 665 OpStart(op,ea); Cycles=4;\r
cc68a136 666 if(eor) {\r
667 if(ea>8) Cycles+=4;\r
668 if(size>=2) Cycles+=4;\r
669 } else {\r
670 if(size>=2) Cycles+=2;\r
671 }\r
672\r
673 ot(";@ Get EA into r10 and value into r0:\n");\r
85a36a57 674 EaCalcReadNoSE(eor?10:-1,0,ea,size,0x003f);\r
cc68a136 675\r
676 ot(";@ Get register operand into r1:\n");\r
85a36a57 677 EaCalcReadNoSE(-1,1,rea,size,0x0e00);\r
678\r
679 if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);\r
680 if (size<2) asl=(char *)(size?",asl #16":",asl #24");\r
cc68a136 681\r
682 ot(";@ Do arithmetic:\n");\r
85a36a57 683 if (eor==0) ot(" rsbs r1,r0,r1%s\n",asl);\r
cc68a136 684 if (eor)\r
685 {\r
85a36a57 686 ot(" eor r1,r0,r1%s\n",asl);\r
cc68a136 687 ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r
688 }\r
689\r
690 OpGetFlags(eor==0,0); // Cmp like subtract\r
691 ot("\n");\r
692\r
693 if (eor) EaWrite(10, 1,ea,size,0x003f,1);\r
694\r
cfb3dfa0 695 OpEnd(ea);\r
cc68a136 696 return 0;\r
697}\r
698\r
699// Emit a Cmpm opcode, 1011ddd1 xx001sss (rrr=Adst, xx=size extension, sss=Asrc)\r
700int OpCmpm(int op)\r
701{\r
702 int size=0,sea=0,dea=0,use=0;\r
85a36a57 703 char *asl="";\r
cc68a136 704\r
705 // get size, get EAs\r
706 size=(op>>6)&3; if (size>=3) return 1;\r
707 sea=(op&7)|0x18;\r
708 dea=(op>>9)&0x3f;\r
709\r
710 use=op&~0x0e07; // Use 1 handler for all registers..\r
85a36a57 711 if (size==0&&sea==0x1f) use|=0x0007; // ..except (a7)+\r
712 if (size==0&&dea==0x1f) use|=0x0e00;\r
cc68a136 713 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
714\r
a6785576 715 OpStart(op,sea); Cycles=4;\r
cc68a136 716\r
717 ot(";@ Get src operand into r10:\n");\r
03c5768c 718 EaCalc (0,0x0007, sea,size,1);\r
719 EaRead (0, 10, sea,size,0x0007,1);\r
cc68a136 720\r
721 ot(";@ Get dst operand into r0:\n");\r
03c5768c 722 EaCalcReadNoSE(-1,0,dea,size,0x0e00);\r
cc68a136 723\r
85a36a57 724 if (size<2) asl=(char *)(size?",asl #16":",asl #24");\r
725\r
726 ot(" rsbs r0,r10,r0%s\n",asl);\r
cc68a136 727 OpGetFlags(1,0); // Cmp like subtract\r
85a36a57 728 ot("\n");\r
cc68a136 729\r
cfb3dfa0 730 OpEnd(sea);\r
cc68a136 731 return 0;\r
732}\r
733\r
734\r
735// Emit a Chk opcode, 0100ddd1 x0eeeeee (rrr=Dn, x=size extension, eeeeee=ea)\r
736int OpChk(int op)\r
737{\r
738 int rea=0;\r
739 int size=0,ea=0,use=0;\r
740\r
741 // Get EA and register EA\r
742 rea=(op>>9)&7;\r
743 if((op>>7)&1)\r
744 size=1; // word operation\r
745 else size=2; // long\r
746 ea=op&0x3f;\r
747\r
748 if (EaAn(ea)) return 1; // not a valid mode\r
749 if (size!=1) return 1; // 000 variant only supports word\r
750\r
751 // See if we can do this opcode:\r
752 if (EaCanRead(ea,size)==0) return 1;\r
753\r
85a36a57 754 use=OpBase(op,size);\r
cc68a136 755 use&=~0x0e00; // Use 1 handler for register d0-7\r
756 if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r
757\r
a6785576 758 OpStart(op,ea); Cycles=10;\r
cc68a136 759\r
760 ot(";@ Get EA into r10 and value into r0:\n");\r
85a36a57 761 EaCalcReadNoSE(-1,0,ea,size,0x003f);\r
cc68a136 762\r
763 ot(";@ Get register operand into r1:\n");\r
85a36a57 764 EaCalcReadNoSE(-1,1,rea,size,0x0e00);\r
765\r
766 if (size<2) ot(" mov r0,r0,asl #%d\n",size?16:24);\r
767 if (size<2) ot(" mov r1,r1,asl #%d\n\n",size?16:24);\r
cc68a136 768\r
769 ot(";@ get flags, including undocumented ones\n");\r
770 ot(" and r3,r9,#0x80000000\n");\r
771 ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r
772 OpGetFlags(0,0);\r
773\r
774 ot(";@ is reg negative?\n");\r
775 ot(" bmi chktrap%.4x\n",op);\r
776\r
777 ot(";@ Do arithmetic:\n");\r
85a36a57 778 ot(" bic r9,r9,#0x80000000 ;@ N\n");\r
cc68a136 779 ot(" cmp r1,r0\n");\r
cc68a136 780 ot(" bgt chktrap%.4x\n",op);\r
781\r
782 ot(";@ old N remains\n");\r
cc68a136 783 ot(" orr r9,r9,r3\n");\r
cfb3dfa0 784 OpEnd(ea);\r
cc68a136 785\r
786 ot("chktrap%.4x%s ;@ CHK exception:\n",op,ms?"":":");\r
787 ot(" mov r0,#0x18\n");\r
788 ot(" bl Exception\n");\r
789 Cycles+=40;\r
cfb3dfa0 790 OpEnd(ea);\r
cc68a136 791\r
792 return 0;\r
793}\r
794\r
fast MegaDrive/MegaCD/32X emulator