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 |
6 | int 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 |
11 | \r |
12 | // Get source and target EA\r |
13 | type=(op>>9)&7; if (type==4 || type>=7) return 1;\r |
14 | size=(op>>6)&3; if (size>=3) return 1;\r |
15 | sea= 0x003c;\r |
16 | tea=op&0x003f;\r |
17 | \r |
18 | // See if we can do this opcode:\r |
19 | if (EaCanRead(tea,size)==0) return 1;\r |
20 | if (EaCanWrite(tea)==0 || EaAn(tea)) return 1;\r |
21 | \r |
22 | use=OpBase(op);\r |
23 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
24 | \r |
25 | OpStart(op); Cycles=4;\r |
26 | \r |
27 | EaCalc(10,0x0000, sea,size,1);\r |
28 | EaRead(10, 10, sea,size,0,1);\r |
29 | \r |
30 | EaCalc(11,0x003f, tea,size,1);\r |
31 | EaRead(11, 0, tea,size,0x003f,1);\r |
32 | \r |
33 | ot(";@ Do arithmetic:\n");\r |
34 | \r |
35 | if (type==0) ot(" orr r1,r0,r10\n");\r |
36 | if (type==1) ot(" and r1,r0,r10\n");\r |
37 | if (type==2) ot(" subs r1,r0,r10 ;@ Defines NZCV\n");\r |
38 | if (type==3) ot(" adds r1,r0,r10 ;@ Defines NZCV\n");\r |
39 | if (type==5) ot(" eor r1,r0,r10\n");\r |
40 | if (type==6) ot(" cmp r0,r10 ;@ Defines NZCV\n");\r |
41 | \r |
42 | if (type<2 || type==5) ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n"); // 0,1,5\r |
43 | \r |
44 | if (type< 2) OpGetFlags(0,0); // Ori/And\r |
45 | if (type==2) OpGetFlags(1,1); // Sub: Subtract/X-bit\r |
46 | if (type==3) OpGetFlags(0,1); // Add: X-bit\r |
47 | if (type==5) OpGetFlags(0,0); // Eor\r |
48 | if (type==6) OpGetFlags(1,0); // Cmp: Subtract\r |
49 | ot("\n");\r |
50 | \r |
51 | if (type!=6)\r |
52 | {\r |
53 | EaWrite(11, 1, tea,size,0x003f,1);\r |
54 | }\r |
55 | \r |
56 | // Correct cycles:\r |
57 | if (type==6)\r |
58 | {\r |
59 | if (size>=2 && tea<0x10) Cycles+=2;\r |
60 | }\r |
61 | else\r |
62 | {\r |
63 | if (size>=2) Cycles+=4;\r |
64 | if (tea>=8) Cycles+=4;\r |
65 | if (type==1 && size>=2 && tea<8) Cycles-=2;\r |
66 | }\r |
67 | \r |
68 | OpEnd();\r |
69 | \r |
70 | return 0;\r |
71 | }\r |
72 | \r |
73 | // --------------------- Opcodes 0x5000+ ---------------------\r |
74 | int OpAddq(int op)\r |
75 | {\r |
76 | // 0101nnnt xxeeeeee (nnn=#8,1-7 t=addq/subq xx=size, eeeeee=EA)\r |
77 | int num=0,type=0,size=0,ea=0;\r |
78 | int use=0;\r |
79 | char count[16]="";\r |
80 | int shift=0;\r |
81 | \r |
82 | num =(op>>9)&7; if (num==0) num=8;\r |
83 | type=(op>>8)&1;\r |
84 | size=(op>>6)&3; if (size>=3) return 1;\r |
85 | ea = op&0x3f;\r |
86 | \r |
87 | // See if we can do this opcode:\r |
88 | if (EaCanRead (ea,size)==0) return 1;\r |
89 | if (EaCanWrite(ea) ==0) return 1;\r |
90 | if (size == 0 && EaAn(ea) ) return 1;\r |
91 | \r |
92 | use=OpBase(op,1);\r |
93 | \r |
94 | if (num!=8) use|=0x0e00; // If num is not 8, use same handler\r |
95 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
96 | \r |
97 | OpStart(op);\r |
98 | Cycles=ea<8?4:8;\r |
99 | if(type==0&&size==1) Cycles=ea<0x10?4:8;\r |
100 | if(size>=2) Cycles=ea<0x10?8:12;\r |
101 | \r |
102 | if (size>0 && (ea&0x38)==0x08) size=2; // addq.w #n,An is also 32-bit\r |
103 | \r |
104 | EaCalc(10,0x003f, ea,size,1);\r |
105 | EaRead(10, 0, ea,size,0x003f,1);\r |
106 | \r |
107 | shift=32-(8<<size);\r |
108 | \r |
109 | if (num!=8)\r |
110 | {\r |
111 | int lsr=9-shift;\r |
112 | \r |
113 | if (lsr>=0) ot(" mov r2,r8,lsr #%d ;@ Get quick value\n", lsr);\r |
114 | else ot(" mov r2,r8,lsl #%d ;@ Get quick value\n",-lsr);\r |
115 | \r |
116 | ot(" and r2,r2,#0x%.4x\n",7<<shift);\r |
117 | ot("\n");\r |
118 | strcpy(count,"r2");\r |
119 | }\r |
120 | \r |
121 | if (num==8) sprintf(count,"#0x%.4x",8<<shift);\r |
122 | \r |
123 | if (type==0) ot(" adds r1,r0,%s\n",count);\r |
124 | if (type==1) ot(" subs r1,r0,%s\n",count);\r |
125 | \r |
126 | if ((ea&0x38)!=0x08) OpGetFlags(type,1);\r |
127 | ot("\n");\r |
128 | \r |
129 | EaWrite(10, 1, ea,size,0x003f,1);\r |
130 | \r |
131 | OpEnd();\r |
132 | \r |
133 | return 0;\r |
134 | }\r |
135 | \r |
136 | // --------------------- Opcodes 0x8000+ ---------------------\r |
137 | // 1t0tnnnd xxeeeeee (tt=type:or/sub/and/add xx=size, eeeeee=EA)\r |
138 | int OpArithReg(int op)\r |
139 | {\r |
140 | int use=0;\r |
141 | int type=0,size=0,dir=0,rea=0,ea=0;\r |
142 | \r |
143 | type=(op>>12)&5;\r |
144 | rea =(op>> 9)&7;\r |
145 | dir =(op>> 8)&1; // er,re\r |
146 | size=(op>> 6)&3; if (size>=3) return 1;\r |
147 | ea = op&0x3f;\r |
148 | \r |
149 | if (dir && ea<0x10) return 1; // addx/subx opcode\r |
150 | \r |
151 | // See if we can do this opcode:\r |
152 | if (dir==0 && EaCanRead (ea,size)==0) return 1;\r |
153 | if (dir && EaCanWrite(ea)==0) return 1;\r |
154 | if ((size==0||!(type&1))&&EaAn(ea)) return 1;\r |
155 | \r |
156 | use=OpBase(op);\r |
157 | use&=~0x0e00; // Use same opcode for Dn\r |
158 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
159 | \r |
160 | OpStart(op); Cycles=4;\r |
161 | \r |
162 | ot(";@ Get r10=EA r11=EA value\n");\r |
163 | EaCalc(10,0x003f, ea,size,1);\r |
164 | EaRead(10, 11, ea,size,0x003f,1);\r |
165 | ot(";@ Get r0=Register r1=Register value\n");\r |
166 | EaCalc( 0,0x0e00,rea,size,1);\r |
167 | EaRead( 0, 1,rea,size,0x0e00,1);\r |
168 | \r |
169 | ot(";@ Do arithmetic:\n");\r |
170 | if (type==0) ot(" orr ");\r |
171 | if (type==1) ot(" subs ");\r |
172 | if (type==4) ot(" and ");\r |
173 | if (type==5) ot(" adds ");\r |
174 | if (dir) ot("r1,r11,r1\n");\r |
175 | else ot("r1,r1,r11\n");\r |
176 | \r |
177 | if ((type&1)==0) ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
178 | \r |
179 | OpGetFlags(type==1,type&1); // 1==subtract\r |
180 | ot("\n");\r |
181 | \r |
182 | ot(";@ Save result:\n");\r |
183 | if (dir) EaWrite(10, 1, ea,size,0x003f,1);\r |
184 | else EaWrite( 0, 1,rea,size,0x0e00,1);\r |
185 | \r |
186 | if(rea==ea) {\r |
187 | if(ea<8) Cycles=(size>=2)?8:4; else Cycles+=(size>=2)?26:14;\r |
188 | } else if(dir) {\r |
189 | Cycles+=4;\r |
190 | if(size>=2) Cycles+=4;\r |
191 | } else {\r |
192 | if(size>=2) {\r |
193 | Cycles+=2;\r |
194 | if(ea<0x10||ea==0x3c) Cycles+=2;\r |
195 | }\r |
196 | }\r |
197 | \r |
198 | OpEnd();\r |
199 | \r |
200 | return 0;\r |
201 | }\r |
202 | \r |
203 | // --------------------- Opcodes 0x80c0+ ---------------------\r |
204 | int OpMul(int op)\r |
205 | {\r |
206 | // Div/Mul: 1m00nnns 11eeeeee (m=Mul, nnn=Register Dn, s=signed, eeeeee=EA)\r |
207 | int type=0,rea=0,sign=0,ea=0;\r |
208 | int use=0;\r |
209 | \r |
210 | type=(op>>14)&1; // div/mul\r |
211 | rea =(op>> 9)&7;\r |
212 | sign=(op>> 8)&1;\r |
213 | ea = op&0x3f;\r |
214 | \r |
215 | // See if we can do this opcode:\r |
216 | if (EaCanRead(ea,1)==0||EaAn(ea)) return 1;\r |
217 | \r |
218 | use=OpBase(op);\r |
219 | use&=~0x0e00; // Use same for all registers\r |
220 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
221 | \r |
222 | OpStart(op);\r |
223 | if(type) Cycles=54;\r |
224 | else Cycles=sign?158:140;\r |
225 | \r |
226 | EaCalc(10,0x003f, ea, 1);\r |
227 | EaRead(10, 10, ea, 1,0x003f);\r |
228 | \r |
229 | EaCalc (0,0x0e00,rea, 2,1);\r |
230 | EaRead (0, 2,rea, 2,0x0e00,1);\r |
231 | \r |
232 | if (type==0) // div\r |
233 | {\r |
234 | // the manual says C is always cleared, but neither Musashi nor FAME do that\r |
235 | //ot(" bic r9,r9,#0x20000000 ;@ always clear C\n");\r |
236 | ot(" tst r10,r10\n");\r |
237 | ot(" beq divzero%.4x ;@ division by zero\n",op);\r |
238 | ot("\n");\r |
239 | \r |
240 | if (sign)\r |
241 | {\r |
242 | ot(" mov r11,#0 ;@ r11 = 1 or 2 if the result is negative\n");\r |
243 | ot(" orrmi r11,r11,#1\n");\r |
244 | ot(" rsbmi r10,r10,#0 ;@ Make r10 positive\n");\r |
245 | ot("\n");\r |
246 | ot(" tst r2,r2\n");\r |
247 | ot(" orrmi r11,r11,#2\n");\r |
248 | ot(" rsbmi r2,r2,#0 ;@ Make r2 positive\n");\r |
249 | ot("\n");\r |
250 | }\r |
251 | else\r |
252 | {\r |
253 | ot(" mov r10,r10,lsl #16 ;@ use only 16 bits of divisor\n");\r |
254 | ot(" mov r10,r10,lsr #16\n");\r |
255 | }\r |
256 | \r |
257 | ot(";@ Divide r2 by r10\n");\r |
258 | ot(" mov r3,#0\n");\r |
259 | ot(" mov r1,r10\n");\r |
260 | ot("\n");\r |
261 | ot(";@ Shift up divisor till it's just less than numerator\n");\r |
262 | ot("Shift%.4x%s\n",op,ms?"":":");\r |
263 | ot(" cmp r1,r2,lsr #1\n");\r |
264 | ot(" movls r1,r1,lsl #1\n");\r |
265 | ot(" bcc Shift%.4x\n",op);\r |
266 | ot("\n");\r |
267 | \r |
268 | ot("Divide%.4x%s\n",op,ms?"":":");\r |
269 | ot(" cmp r2,r1\n");\r |
270 | ot(" adc r3,r3,r3 ;@ Double r3 and add 1 if carry set\n");\r |
271 | ot(" subcs r2,r2,r1\n");\r |
272 | ot(" teq r1,r10\n");\r |
273 | ot(" movne r1,r1,lsr #1\n");\r |
274 | ot(" bne Divide%.4x\n",op);\r |
275 | ot("\n");\r |
276 | ot(";@r3==quotient,r2==remainder\n");\r |
277 | \r |
278 | if (sign)\r |
279 | {\r |
280 | // sign correction\r |
281 | ot(" and r1,r11,#1\n");\r |
282 | ot(" teq r1,r11,lsr #1\n");\r |
283 | ot(" rsbne r3,r3,#0 ;@ negate if quotient is negative\n");\r |
284 | ot(" tst r11,#2\n");\r |
285 | ot(" rsbne r2,r2,#0 ;@ negate the remainder if divident was negative\n");\r |
286 | ot("\n");\r |
287 | \r |
288 | // signed overflow check\r |
289 | ot(" mov r1,r3,asl #16\n");\r |
290 | ot(" cmp r3,r1,asr #16 ;@ signed overflow?\n");\r |
291 | ot(" orrne r9,r9,#0x10000000 ;@ set overflow flag\n");\r |
292 | ot(" bne endofop%.4x ;@ overflow!\n",op);\r |
293 | }\r |
294 | else\r |
295 | {\r |
296 | // overflow check\r |
297 | ot(" movs r1,r3,lsr #16 ;@ check for overflow condition\n");\r |
298 | ot(" orrne r9,r9,#0x10000000 ;@ set overflow flag\n");\r |
299 | ot(" bne endofop%.4x ;@ overflow!\n",op);\r |
300 | }\r |
301 | \r |
302 | ot(" mov r1,r3,lsl #16 ;@ Clip to 16-bits\n");\r |
303 | ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
304 | OpGetFlags(0,0);\r |
305 | \r |
306 | ot(" mov r1,r1,lsr #16\n");\r |
307 | ot(" orr r1,r1,r2,lsl #16 ;@ Insert remainder\n");\r |
308 | }\r |
309 | \r |
310 | if (type==1)\r |
311 | {\r |
312 | char *shift="asr";\r |
313 | \r |
314 | ot(";@ Get 16-bit signs right:\n");\r |
315 | if (sign==0) { ot(" mov r10,r10,lsl #16\n"); shift="lsr"; }\r |
316 | ot(" mov r2,r2,lsl #16\n");\r |
317 | \r |
318 | if (sign==0) ot(" mov r10,r10,lsr #16\n");\r |
319 | ot(" mov r2,r2,%s #16\n",shift);\r |
320 | ot("\n");\r |
321 | \r |
322 | ot(" mul r1,r2,r10\n");\r |
323 | ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
324 | OpGetFlags(0,0);\r |
325 | }\r |
326 | ot("\n");\r |
327 | \r |
328 | EaWrite(0, 1,rea, 2,0x0e00,1);\r |
329 | \r |
330 | ot("endofop%.4x%s\n",op,ms?"":":");\r |
331 | OpEnd();\r |
332 | \r |
333 | ot("divzero%.4x%s\n",op,ms?"":":");\r |
334 | ot(" mov r0,#0x14 ;@ Divide by zero\n");\r |
335 | ot(" bl Exception\n");\r |
336 | Cycles+=38;\r |
337 | OpEnd();\r |
338 | ot("\n");\r |
339 | \r |
340 | return 0;\r |
341 | }\r |
342 | \r |
343 | // Get X Bit into carry - trashes r2\r |
344 | int GetXBit(int subtract)\r |
345 | {\r |
346 | ot(";@ Get X bit:\n");\r |
347 | ot(" ldrb r2,[r7,#0x45]\n");\r |
348 | if (subtract) ot(" mvn r2,r2,lsl #28 ;@ Invert it\n");\r |
349 | else ot(" mov r2,r2,lsl #28\n");\r |
350 | ot(" msr cpsr_flg,r2 ;@ Get into Carry\n");\r |
351 | ot("\n");\r |
352 | return 0;\r |
353 | }\r |
354 | \r |
355 | // --------------------- Opcodes 0x8100+ ---------------------\r |
356 | // 1t00ddd1 0000asss - sbcd/abcd Ds,Dd or -(As),-(Ad)\r |
357 | int OpAbcd(int op)\r |
358 | {\r |
359 | int use=0;\r |
360 | int type=0,sea=0,addr=0,dea=0;\r |
361 | \r |
362 | type=(op>>14)&1; // sbcd/abcd\r |
363 | dea =(op>> 9)&7;\r |
364 | addr=(op>> 3)&1;\r |
365 | sea = op &7;\r |
366 | \r |
367 | if (addr) { sea|=0x20; dea|=0x20; }\r |
368 | \r |
369 | use=op&~0x0e07; // Use same opcode for all registers..\r |
370 | if (sea==0x27||dea==0x27) use=op; // ..except -(a7)\r |
371 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
372 | \r |
373 | OpStart(op); Cycles=6;\r |
374 | \r |
375 | EaCalc( 0,0x0007, sea,0,1);\r |
376 | EaRead( 0, 10, sea,0,0x0007,1);\r |
377 | EaCalc(11,0x0e00, dea,0,1);\r |
378 | EaRead(11, 1, dea,0,0x0e00,1);\r |
379 | \r |
380 | ot(" bic r9,r9,#0xb1000000 ;@ clear all flags except old Z\n");\r |
381 | \r |
382 | if (type)\r |
383 | {\r |
384 | ot(" ldrb r0,[r7,#0x45] ;@ Get X bit\n");\r |
385 | ot(" mov r3,#0x00f00000\n");\r |
386 | ot(" and r2,r3,r1,lsr #4\n");\r |
387 | ot(" tst r0,#2\n");\r |
388 | ot(" and r0,r3,r10,lsr #4\n");\r |
389 | ot(" add r0,r0,r2\n");\r |
390 | ot(" addne r0,r0,#0x00100000\n");\r |
391 | // ot(" tst r0,#0x00800000\n");\r |
392 | // ot(" orreq r9,r9,#0x01000000 ;@ Undefined V behavior\n");\r |
393 | ot(" cmp r0,#0x00900000\n");\r |
394 | ot(" addhi r0,r0,#0x00600000 ;@ Decimal adjust units\n");\r |
395 | \r |
396 | ot(" mov r2,r1,lsr #28\n");\r |
397 | ot(" add r0,r0,r2,lsl #24\n");\r |
398 | ot(" mov r2,r10,lsr #28\n");\r |
399 | ot(" add r0,r0,r2,lsl #24\n");\r |
400 | ot(" cmp r0,#0x09900000\n");\r |
401 | ot(" orrhi r9,r9,#0x20000000 ;@ C\n");\r |
402 | ot(" subhi r0,r0,#0x0a000000\n");\r |
403 | // ot(" and r3,r9,r0,lsr #3 ;@ Undefined V behavior part II\n");\r |
404 | // ot(" orr r9,r9,r3,lsl #4 ;@ V\n");\r |
405 | ot(" movs r0,r0,lsl #4\n");\r |
406 | ot(" orrmi r9,r9,#0x90000000 ;@ Undefined N+V behavior\n"); // this is what Musashi really does\r |
407 | ot(" bicne r9,r9,#0x40000000 ;@ Z flag\n");\r |
408 | }\r |
409 | else\r |
410 | {\r |
411 | ot(" ldrb r0,[r7,#0x45] ;@ Get X bit\n");\r |
412 | ot(" mov r3,#0x00f00000\n");\r |
413 | ot(" and r2,r3,r10,lsr #4\n");\r |
414 | ot(" tst r0,#2\n");\r |
415 | ot(" and r0,r3,r1,lsr #4\n");\r |
416 | ot(" sub r0,r0,r2\n");\r |
417 | ot(" subne r0,r0,#0x00100000\n");\r |
418 | // ot(" tst r0,#0x00800000\n");\r |
419 | // ot(" orreq r9,r9,#0x01000000 ;@ Undefined V behavior\n");\r |
420 | ot(" cmp r0,#0x00900000\n");\r |
421 | ot(" subhi r0,r0,#0x00600000 ;@ Decimal adjust units\n");\r |
422 | \r |
423 | ot(" mov r2,r1,lsr #28\n");\r |
424 | ot(" add r0,r0,r2,lsl #24\n");\r |
425 | ot(" mov r2,r10,lsr #28\n");\r |
426 | ot(" sub r0,r0,r2,lsl #24\n");\r |
427 | ot(" cmp r0,#0x09900000\n");\r |
428 | ot(" orrhi r9,r9,#0xa0000000 ;@ N and C\n");\r |
429 | ot(" addhi r0,r0,#0x0a000000\n");\r |
430 | // ot(" and r3,r9,r0,lsr #3 ;@ Undefined V behavior part II\n");\r |
431 | // ot(" orr r9,r9,r3,lsl #4 ;@ V\n");\r |
432 | ot(" movs r0,r0,lsl #4\n");\r |
433 | // ot(" orrmi r9,r9,#0x80000000 ;@ Undefined N behavior\n");\r |
434 | ot(" bicne r9,r9,#0x40000000 ;@ Z flag\n");\r |
435 | }\r |
436 | \r |
437 | ot(" mov r2,r9,lsr #28\n");\r |
438 | ot(" strb r2,[r7,#0x45] ;@ Save X bit\n");\r |
439 | \r |
440 | EaWrite(11, 0, dea,0,0x0e00,1);\r |
441 | OpEnd();\r |
442 | \r |
443 | return 0;\r |
444 | }\r |
445 | \r |
446 | // 01008000 00eeeeee - nbcd <ea>\r |
447 | int OpNbcd(int op)\r |
448 | {\r |
449 | int use=0;\r |
450 | int ea=0;\r |
451 | \r |
452 | ea=op&0x3f;\r |
453 | \r |
454 | if(EaCanWrite(ea)==0||EaAn(ea)) return 1;\r |
455 | \r |
456 | use=OpBase(op);\r |
457 | if(op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
458 | \r |
459 | OpStart(op); Cycles=6;\r |
460 | if(ea >= 8) Cycles+=2;\r |
461 | \r |
462 | EaCalc(10,0x3f, ea,0,1);\r |
463 | EaRead(10, 0, ea,0,0x3f,1);\r |
464 | \r |
465 | // this is rewrite of Musashi's code\r |
466 | ot(" ldrb r2,[r7,#0x45]\n");\r |
467 | ot(" tst r2,#2\n");\r |
468 | ot(" mov r2,r0\n");\r |
469 | ot(" addne r2,r0,#0x01000000 ;@ add X\n");\r |
470 | ot(" rsbs r1,r2,#0x9a000000 ;@ do arithmetic\n");\r |
471 | \r |
472 | ot(" bic r9,r9,#0xb0000000 ;@ clear all flags, except Z\n");\r |
473 | ot(" orrmi r9,r9,#0x80000000 ;@ N\n");\r |
474 | ot(" cmp r1,#0x9a000000\n");\r |
475 | ot(" beq finish%.4x\n",op);\r |
476 | ot("\n");\r |
477 | \r |
478 | ot(" mvn r3,r9,lsr #3 ;@ Undefined V behavior\n",op);\r |
479 | ot(" and r2,r1,#0x0f000000\n");\r |
480 | ot(" cmp r2,#0x0a000000\n");\r |
481 | ot(" andeq r1,r1,#0xf0000000\n");\r |
482 | ot(" addeq r1,r1,#0x10000000\n");\r |
483 | ot(" and r3,r3,r1,lsr #3 ;@ Undefined V behavior part II\n",op);\r |
484 | ot(" tst r1,r1\n");\r |
485 | ot(" orr r9,r9,r3 ;@ save V\n",op);\r |
486 | ot(" bicne r9,r9,#0x40000000 ;@ Z\n");\r |
487 | ot(" orr r9,r9,#0x20000000 ;@ C\n");\r |
488 | ot("\n");\r |
489 | \r |
490 | EaWrite(10, 1, ea,0,0x3f,1);\r |
491 | \r |
492 | ot("finish%.4x%s\n",op,ms?"":":");\r |
493 | ot(" mov r2,r9,lsr #28\n");\r |
494 | ot(" strb r2, [r7,#0x45]\n");\r |
495 | \r |
496 | OpEnd();\r |
497 | \r |
498 | return 0;\r |
499 | }\r |
500 | \r |
501 | // --------------------- Opcodes 0x90c0+ ---------------------\r |
502 | // Suba/Cmpa/Adda 1tt1nnnx 11eeeeee (tt=type, x=size, eeeeee=Source EA)\r |
503 | int OpAritha(int op)\r |
504 | {\r |
505 | int use=0;\r |
506 | int type=0,size=0,sea=0,dea=0;\r |
507 | \r |
508 | // Suba/Cmpa/Adda/(invalid):\r |
509 | type=(op>>13)&3; if (type>=3) return 1;\r |
510 | \r |
511 | size=(op>>8)&1; size++;\r |
512 | dea=(op>>9)&7; dea|=8; // Dest=An\r |
513 | sea=op&0x003f; // Source\r |
514 | \r |
515 | // See if we can do this opcode:\r |
516 | if (EaCanRead(sea,size)==0) return 1;\r |
517 | \r |
518 | use=OpBase(op);\r |
519 | use&=~0x0e00; // Use same opcode for An\r |
520 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
521 | \r |
522 | OpStart(op); Cycles=(size==2)?6:8;\r |
523 | if(size==2&&(sea<0x10||sea==0x3c)) Cycles+=2;\r |
524 | if(type==1) Cycles=6;\r |
525 | \r |
526 | \r |
527 | EaCalc ( 0,0x003f, sea,size);\r |
528 | EaRead ( 0, 10, sea,size,0x003f);\r |
529 | \r |
530 | EaCalc ( 0,0x0e00, dea,2,1);\r |
531 | EaRead ( 0, 1, dea,2,0x0e00);\r |
532 | \r |
533 | if (type==0) ot(" sub r1,r1,r10\n");\r |
534 | if (type==1) ot(" cmp r1,r10 ;@ Defines NZCV\n");\r |
535 | if (type==1) OpGetFlags(1,0); // Get Cmp flags\r |
536 | if (type==2) ot(" add r1,r1,r10\n");\r |
537 | ot("\n");\r |
538 | \r |
539 | if (type!=1) EaWrite( 0, 1, dea,2,0x0e00,1);\r |
540 | \r |
541 | OpEnd();\r |
542 | \r |
543 | return 0;\r |
544 | }\r |
545 | \r |
546 | // --------------------- Opcodes 0x9100+ ---------------------\r |
547 | // Emit a Subx/Addx opcode, 1t01ddd1 zz00rsss addx.z Ds,Dd\r |
548 | int OpAddx(int op)\r |
549 | {\r |
550 | int use=0;\r |
551 | int type=0,size=0,dea=0,sea=0,mem=0;\r |
552 | \r |
553 | type=(op>>12)&5;\r |
554 | dea =(op>> 9)&7;\r |
555 | size=(op>> 6)&3; if (size>=3) return 1;\r |
556 | sea = op&7;\r |
557 | mem =(op>> 3)&1;\r |
558 | \r |
559 | // See if we can do this opcode:\r |
560 | if (EaCanRead(sea,size)==0) return 1;\r |
561 | if (EaCanWrite(dea)==0) return 1;\r |
562 | \r |
563 | if(mem) { sea+=0x20; dea+=0x20; }\r |
564 | \r |
565 | use=op&~0x0e07; // Use same opcode for Dn\r |
566 | if (size==0&&(sea==0x27||dea==0x27)) use=op; // ___x.b -(a7)\r |
567 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
568 | \r |
569 | OpStart(op); Cycles=4;\r |
570 | if(size>=2) Cycles+=4;\r |
571 | if(sea>=0x10) Cycles+=2;\r |
572 | \r |
573 | ot(";@ Get r10=EA r11=EA value\n");\r |
574 | EaCalc( 0,0x0007,sea,size,1);\r |
575 | EaRead( 0, 11,sea,size,0x0007,1);\r |
576 | ot(";@ Get r0=Register r1=Register value\n");\r |
577 | EaCalc( 0,0x0e00,dea,size,1);\r |
578 | EaRead( 0, 1,dea,size,0x0e00,1);\r |
579 | \r |
580 | ot(";@ Do arithmetic:\n");\r |
581 | GetXBit(type==1);\r |
582 | \r |
583 | if (type==5 && size<2)\r |
584 | {\r |
585 | ot(";@ Make sure the carry bit will tip the balance:\n");\r |
586 | ot(" mvn r2,#0\n");\r |
587 | ot(" orr r11,r11,r2,lsr #%i\n",(size==0)?8:16);\r |
588 | ot("\n");\r |
589 | }\r |
590 | \r |
591 | if (type==1) ot(" sbcs r1,r1,r11\n");\r |
592 | if (type==5) ot(" adcs r1,r1,r11\n");\r |
593 | ot(" orr r3,r9,#0xb0000000 ;@ for old Z\n");\r |
594 | OpGetFlags(type==1,1,0); // subtract\r |
595 | if (size<2) {\r |
596 | ot(" movs r2,r1,lsr #%i\n", size?16:24);\r |
597 | ot(" orreq r9,r9,#0x40000000 ;@ add potentially missed Z\n");\r |
598 | }\r |
599 | ot(" andeq r9,r9,r3 ;@ fix Z\n");\r |
600 | ot("\n");\r |
601 | \r |
602 | ot(";@ Save result:\n");\r |
603 | EaWrite( 0, 1, dea,size,0x0e00,1);\r |
604 | \r |
605 | OpEnd();\r |
606 | \r |
607 | return 0;\r |
608 | }\r |
609 | \r |
610 | // --------------------- Opcodes 0xb000+ ---------------------\r |
611 | // Emit a Cmp/Eor opcode, 1011rrrt xxeeeeee (rrr=Dn, t=cmp/eor, xx=size extension, eeeeee=ea)\r |
612 | int OpCmpEor(int op)\r |
613 | {\r |
614 | int rea=0,eor=0;\r |
615 | int size=0,ea=0,use=0;\r |
616 | \r |
617 | // Get EA and register EA\r |
618 | rea=(op>>9)&7;\r |
619 | eor=(op>>8)&1;\r |
620 | size=(op>>6)&3; if (size>=3) return 1;\r |
621 | ea=op&0x3f;\r |
622 | \r |
623 | if (eor && (ea>>3) == 1) return 1; // not a valid mode for eor\r |
624 | \r |
625 | // See if we can do this opcode:\r |
626 | if (EaCanRead(ea,size)==0) return 1;\r |
627 | if (eor && EaCanWrite(ea)==0) return 1;\r |
628 | if (EaAn(ea)&&(eor||size==0)) return 1;\r |
629 | \r |
630 | use=OpBase(op);\r |
631 | use&=~0x0e00; // Use 1 handler for register d0-7\r |
632 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
633 | \r |
634 | OpStart(op); Cycles=4;\r |
635 | if(eor) {\r |
636 | if(ea>8) Cycles+=4;\r |
637 | if(size>=2) Cycles+=4;\r |
638 | } else {\r |
639 | if(size>=2) Cycles+=2;\r |
640 | }\r |
641 | \r |
642 | ot(";@ Get EA into r10 and value into r0:\n");\r |
643 | EaCalc (10,0x003f, ea,size,1);\r |
644 | EaRead (10, 0, ea,size,0x003f,1);\r |
645 | \r |
646 | ot(";@ Get register operand into r1:\n");\r |
647 | EaCalc (1, 0x0e00, rea,size,1);\r |
648 | EaRead (1, 1, rea,size,0x0e00,1);\r |
649 | \r |
650 | ot(";@ Do arithmetic:\n");\r |
651 | if (eor==0) ot(" cmp r1,r0\n");\r |
652 | if (eor)\r |
653 | {\r |
654 | ot(" eor r1,r0,r1\n");\r |
655 | ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
656 | }\r |
657 | \r |
658 | OpGetFlags(eor==0,0); // Cmp like subtract\r |
659 | ot("\n");\r |
660 | \r |
661 | if (eor) EaWrite(10, 1,ea,size,0x003f,1);\r |
662 | \r |
663 | OpEnd();\r |
664 | return 0;\r |
665 | }\r |
666 | \r |
667 | // Emit a Cmpm opcode, 1011ddd1 xx001sss (rrr=Adst, xx=size extension, sss=Asrc)\r |
668 | int OpCmpm(int op)\r |
669 | {\r |
670 | int size=0,sea=0,dea=0,use=0;\r |
671 | \r |
672 | // get size, get EAs\r |
673 | size=(op>>6)&3; if (size>=3) return 1;\r |
674 | sea=(op&7)|0x18;\r |
675 | dea=(op>>9)&0x3f;\r |
676 | \r |
677 | use=op&~0x0e07; // Use 1 handler for all registers..\r |
678 | if (size==0&&(sea==0x1f||dea==0x1f)) use=op; // ..except (a7)+\r |
679 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
680 | \r |
681 | OpStart(op); Cycles=4;\r |
682 | \r |
683 | ot(";@ Get src operand into r10:\n");\r |
684 | EaCalc (0,0x000f, sea,size,1);\r |
685 | EaRead (0, 10, sea,size,0x000f,1);\r |
686 | \r |
687 | ot(";@ Get dst operand into r0:\n");\r |
688 | EaCalc (0,0x1e00, dea,size,1);\r |
689 | EaRead (0, 0, dea,size,0x1e00,1);\r |
690 | \r |
691 | ot(" cmp r0,r10\n");\r |
692 | OpGetFlags(1,0); // Cmp like subtract\r |
693 | \r |
694 | OpEnd();\r |
695 | return 0;\r |
696 | }\r |
697 | \r |
698 | \r |
699 | // Emit a Chk opcode, 0100ddd1 x0eeeeee (rrr=Dn, x=size extension, eeeeee=ea)\r |
700 | int OpChk(int op)\r |
701 | {\r |
702 | int rea=0;\r |
703 | int size=0,ea=0,use=0;\r |
704 | \r |
705 | // Get EA and register EA\r |
706 | rea=(op>>9)&7;\r |
707 | if((op>>7)&1)\r |
708 | size=1; // word operation\r |
709 | else size=2; // long\r |
710 | ea=op&0x3f;\r |
711 | \r |
712 | if (EaAn(ea)) return 1; // not a valid mode\r |
713 | if (size!=1) return 1; // 000 variant only supports word\r |
714 | \r |
715 | // See if we can do this opcode:\r |
716 | if (EaCanRead(ea,size)==0) return 1;\r |
717 | \r |
718 | use=OpBase(op);\r |
719 | use&=~0x0e00; // Use 1 handler for register d0-7\r |
720 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
721 | \r |
722 | OpStart(op); Cycles=10;\r |
723 | \r |
724 | ot(";@ Get EA into r10 and value into r0:\n");\r |
725 | EaCalc (10,0x003f, ea,size,1);\r |
726 | EaRead (10, 0, ea,size,0x003f,1);\r |
727 | \r |
728 | ot(";@ Get register operand into r1:\n");\r |
729 | EaCalc (1, 0x0e00, rea,size,1);\r |
730 | EaRead (1, 1, rea,size,0x0e00,1);\r |
731 | \r |
732 | ot(";@ get flags, including undocumented ones\n");\r |
733 | ot(" and r3,r9,#0x80000000\n");\r |
734 | ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
735 | OpGetFlags(0,0);\r |
736 | \r |
737 | ot(";@ is reg negative?\n");\r |
738 | ot(" bmi chktrap%.4x\n",op);\r |
739 | \r |
740 | ot(";@ Do arithmetic:\n");\r |
741 | ot(" cmp r1,r0\n");\r |
742 | ot(" bicgt r9,r9,#0x80000000 ;@ N\n");\r |
743 | ot(" bgt chktrap%.4x\n",op);\r |
744 | \r |
745 | ot(";@ old N remains\n");\r |
746 | ot(" bic r9,r9,#0x80000000 ;@ N\n");\r |
747 | ot(" orr r9,r9,r3\n");\r |
748 | OpEnd();\r |
749 | \r |
750 | ot("chktrap%.4x%s ;@ CHK exception:\n",op,ms?"":":");\r |
751 | ot(" mov r0,#0x18\n");\r |
752 | ot(" bl Exception\n");\r |
753 | Cycles+=40;\r |
754 | OpEnd();\r |
755 | \r |
756 | return 0;\r |
757 | }\r |
758 | \r |