cc68a136 |
1 | #include "app.h"\r |
2 | \r |
3 | // --------------------- Opcodes 0x0100+ ---------------------\r |
4 | // Emit a Btst (Register) opcode 0000nnn1 ttaaaaaa\r |
5 | int OpBtstReg(int op)\r |
6 | {\r |
7 | int use=0;\r |
8 | int type=0,sea=0,tea=0;\r |
9 | int size=0;\r |
10 | \r |
11 | type=(op>>6)&3; // Btst/Bchg/Bclr/Bset\r |
12 | // Get source and target EA\r |
13 | sea=(op>>9)&7;\r |
14 | tea=op&0x003f;\r |
15 | if (tea<0x10) size=2; // For registers, 32-bits\r |
16 | \r |
17 | if ((tea&0x38)==0x08) return 1; // movep\r |
18 | \r |
19 | // See if we can do this opcode:\r |
20 | if (EaCanRead(tea,0)==0) return 1;\r |
21 | if (type>0)\r |
22 | {\r |
23 | if (EaCanWrite(tea)==0) return 1;\r |
24 | }\r |
25 | \r |
85a36a57 |
26 | use=OpBase(op,size);\r |
cc68a136 |
27 | use&=~0x0e00; // Use same handler for all registers\r |
28 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
29 | \r |
a6785576 |
30 | OpStart(op,tea);\r |
cc68a136 |
31 | \r |
32 | if(type==1||type==3) {\r |
33 | Cycles=8;\r |
34 | } else {\r |
35 | Cycles=type?8:4;\r |
36 | if(size>=2) Cycles+=2;\r |
37 | }\r |
38 | \r |
85a36a57 |
39 | EaCalcReadNoSE(-1,10,sea,0,0x0e00);\r |
b637c56a |
40 | \r |
85a36a57 |
41 | EaCalcReadNoSE((type>0)?11:-1,0,tea,size,0x003f);\r |
b637c56a |
42 | \r |
cc68a136 |
43 | if (tea>=0x10)\r |
b637c56a |
44 | ot(" and r10,r10,#7 ;@ mem - do mod 8\n"); // size always 0\r |
45 | else ot(" and r10,r10,#31 ;@ reg - do mod 32\n"); // size always 2\r |
cc68a136 |
46 | ot("\n");\r |
47 | \r |
cc68a136 |
48 | ot(" mov r1,#1\n");\r |
49 | ot(" tst r0,r1,lsl r10 ;@ Do arithmetic\n");\r |
50 | ot(" bicne r9,r9,#0x40000000\n");\r |
51 | ot(" orreq r9,r9,#0x40000000 ;@ Get Z flag\n");\r |
52 | ot("\n");\r |
53 | \r |
54 | if (type>0)\r |
55 | {\r |
56 | if (type==1) ot(" eor r1,r0,r1,lsl r10 ;@ Toggle bit\n");\r |
57 | if (type==2) ot(" bic r1,r0,r1,lsl r10 ;@ Clear bit\n");\r |
58 | if (type==3) ot(" orr r1,r0,r1,lsl r10 ;@ Set bit\n");\r |
59 | ot("\n");\r |
b637c56a |
60 | EaWrite(11, 1,tea,size,0x003f,0,0);\r |
cc68a136 |
61 | }\r |
cfb3dfa0 |
62 | OpEnd(tea);\r |
cc68a136 |
63 | \r |
64 | return 0;\r |
65 | }\r |
66 | \r |
67 | // --------------------- Opcodes 0x0800+ ---------------------\r |
68 | // Emit a Btst/Bchg/Bclr/Bset (Immediate) opcode 00001000 ttaaaaaa nn\r |
69 | int OpBtstImm(int op)\r |
70 | {\r |
71 | int type=0,sea=0,tea=0;\r |
72 | int use=0;\r |
73 | int size=0;\r |
74 | \r |
75 | type=(op>>6)&3;\r |
76 | // Get source and target EA\r |
77 | sea= 0x003c;\r |
78 | tea=op&0x003f;\r |
79 | if (tea<0x10) size=2; // For registers, 32-bits\r |
80 | \r |
81 | // See if we can do this opcode:\r |
82 | if (EaCanRead(tea,0)==0||EaAn(tea)||tea==0x3c) return 1;\r |
83 | if (type>0)\r |
84 | {\r |
85 | if (EaCanWrite(tea)==0) return 1;\r |
86 | }\r |
87 | \r |
85a36a57 |
88 | use=OpBase(op,size);\r |
cc68a136 |
89 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
90 | \r |
cfb3dfa0 |
91 | OpStart(op,sea,tea);\r |
cc68a136 |
92 | \r |
cc68a136 |
93 | ot("\n");\r |
85a36a57 |
94 | EaCalcReadNoSE(-1,0,sea,0,0);\r |
b637c56a |
95 | ot(" mov r10,#1\n");\r |
cc68a136 |
96 | ot(" bic r9,r9,#0x40000000 ;@ Blank Z flag\n");\r |
97 | if (tea>=0x10)\r |
b637c56a |
98 | ot(" and r0,r0,#7 ;@ mem - do mod 8\n"); // size always 0\r |
99 | else ot(" and r0,r0,#0x1F ;@ reg - do mod 32\n"); // size always 2\r |
cc68a136 |
100 | ot(" mov r10,r10,lsl r0 ;@ Make bit mask\n");\r |
101 | ot("\n");\r |
102 | \r |
103 | if(type==1||type==3) {\r |
104 | Cycles=12;\r |
105 | } else {\r |
106 | Cycles=type?12:8;\r |
107 | if(size>=2) Cycles+=2;\r |
108 | }\r |
109 | \r |
85a36a57 |
110 | EaCalcReadNoSE((type>0)?11:-1,0,tea,size,0x003f);\r |
cc68a136 |
111 | ot(" tst r0,r10 ;@ Do arithmetic\n");\r |
112 | ot(" orreq r9,r9,#0x40000000 ;@ Get Z flag\n");\r |
113 | ot("\n");\r |
114 | \r |
115 | if (type>0)\r |
116 | {\r |
117 | if (type==1) ot(" eor r1,r0,r10 ;@ Toggle bit\n");\r |
118 | if (type==2) ot(" bic r1,r0,r10 ;@ Clear bit\n");\r |
119 | if (type==3) ot(" orr r1,r0,r10 ;@ Set bit\n");\r |
120 | ot("\n");\r |
b637c56a |
121 | EaWrite(11, 1,tea,size,0x003f,0,0);\r |
cc68a136 |
122 | }\r |
123 | \r |
cfb3dfa0 |
124 | OpEnd(sea,tea);\r |
cc68a136 |
125 | \r |
126 | return 0;\r |
127 | }\r |
128 | \r |
129 | // --------------------- Opcodes 0x4000+ ---------------------\r |
130 | int OpNeg(int op)\r |
131 | {\r |
132 | // 01000tt0 xxeeeeee (tt=negx/clr/neg/not, xx=size, eeeeee=EA)\r |
133 | int type=0,size=0,ea=0,use=0;\r |
134 | \r |
135 | type=(op>>9)&3;\r |
136 | ea =op&0x003f;\r |
137 | size=(op>>6)&3; if (size>=3) return 1;\r |
138 | \r |
139 | // See if we can do this opcode:\r |
140 | if (EaCanRead (ea,size)==0||EaAn(ea)) return 1;\r |
141 | if (EaCanWrite(ea )==0) return 1;\r |
142 | \r |
85a36a57 |
143 | use=OpBase(op,size);\r |
cc68a136 |
144 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
145 | \r |
a6785576 |
146 | OpStart(op,ea); Cycles=size<2?4:6;\r |
cc68a136 |
147 | if(ea >= 0x10) {\r |
148 | Cycles*=2;\r |
a9a5a6e0 |
149 | #if CYCLONE_FOR_GENESIS\r |
cc68a136 |
150 | // This is same as in Starscream core, CLR uses only 6 cycles for memory EAs.\r |
151 | // May be this is similar case as with TAS opcode, but this time the dummy\r |
152 | // read is ignored somehow? Without this hack Fatal Rewind hangs even in Gens.\r |
153 | if(type==1&&size<2) Cycles-=2;\r |
154 | #endif\r |
155 | }\r |
156 | \r |
b637c56a |
157 | EaCalc (10,0x003f,ea,size,0,0);\r |
cc68a136 |
158 | \r |
85a36a57 |
159 | if (type!=1) EaRead (10,0,ea,size,0x003f,0,0); // Don't need to read for 'clr' (or do we, for a dummy read?)\r |
cc68a136 |
160 | if (type==1) ot("\n");\r |
161 | \r |
162 | if (type==0)\r |
163 | {\r |
164 | ot(";@ Negx:\n");\r |
165 | GetXBit(1);\r |
b637c56a |
166 | if(size!=2) ot(" mov r0,r0,asl #%i\n",size?16:24);\r |
cc68a136 |
167 | ot(" rscs r1,r0,#0 ;@ do arithmetic\n");\r |
168 | ot(" orr r3,r9,#0xb0000000 ;@ for old Z\n");\r |
169 | OpGetFlags(1,1,0);\r |
170 | if(size!=2) {\r |
a6785576 |
171 | ot(" movs r1,r1,asr #%i\n",size?16:24);\r |
cc68a136 |
172 | ot(" orreq r9,r9,#0x40000000 ;@ possily missed Z\n");\r |
a6785576 |
173 | }\r |
174 | ot(" andeq r9,r9,r3 ;@ fix Z\n");\r |
cc68a136 |
175 | ot("\n");\r |
176 | }\r |
177 | \r |
178 | if (type==1)\r |
179 | {\r |
180 | ot(";@ Clear:\n");\r |
181 | ot(" mov r1,#0\n");\r |
182 | ot(" mov r9,#0x40000000 ;@ NZCV=0100\n");\r |
183 | ot("\n");\r |
184 | }\r |
185 | \r |
186 | if (type==2)\r |
187 | {\r |
188 | ot(";@ Neg:\n");\r |
b637c56a |
189 | if(size!=2) ot(" mov r0,r0,asl #%i\n",size?16:24);\r |
cc68a136 |
190 | ot(" rsbs r1,r0,#0\n");\r |
191 | OpGetFlags(1,1);\r |
192 | if(size!=2) ot(" mov r1,r1,asr #%i\n",size?16:24);\r |
193 | ot("\n");\r |
194 | }\r |
195 | \r |
196 | if (type==3)\r |
197 | {\r |
198 | ot(";@ Not:\n");\r |
b637c56a |
199 | if(size!=2) {\r |
200 | ot(" mov r0,r0,asl #%i\n",size?16:24);\r |
201 | ot(" mvn r1,r0,asr #%i\n",size?16:24);\r |
202 | }\r |
203 | else\r |
204 | ot(" mvn r1,r0\n");\r |
cc68a136 |
205 | ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
206 | OpGetFlags(0,0);\r |
207 | ot("\n");\r |
208 | }\r |
209 | \r |
0e11c502 |
210 | if (type==1) eawrite_check_addrerr=1;\r |
b637c56a |
211 | EaWrite(10, 1,ea,size,0x003f,0,0);\r |
cc68a136 |
212 | \r |
cfb3dfa0 |
213 | OpEnd(ea);\r |
cc68a136 |
214 | \r |
215 | return 0;\r |
216 | }\r |
217 | \r |
218 | // --------------------- Opcodes 0x4840+ ---------------------\r |
219 | // Swap, 01001000 01000nnn swap Dn\r |
220 | int OpSwap(int op)\r |
221 | {\r |
222 | int ea=0,use=0;\r |
223 | \r |
224 | ea=op&7;\r |
225 | use=op&~0x0007; // Use same opcode for all An\r |
226 | \r |
227 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
228 | \r |
229 | OpStart(op); Cycles=4;\r |
230 | \r |
231 | EaCalc (10,0x0007,ea,2,1);\r |
232 | EaRead (10, 0,ea,2,0x0007,1);\r |
233 | \r |
234 | ot(" mov r1,r0,ror #16\n");\r |
235 | ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
236 | OpGetFlags(0,0);\r |
237 | \r |
238 | EaWrite(10, 1,8,2,0x0007,1);\r |
239 | \r |
240 | OpEnd();\r |
241 | \r |
242 | return 0;\r |
243 | }\r |
244 | \r |
245 | // --------------------- Opcodes 0x4a00+ ---------------------\r |
246 | // Emit a Tst opcode, 01001010 xxeeeeee\r |
247 | int OpTst(int op)\r |
248 | {\r |
249 | int sea=0;\r |
250 | int size=0,use=0;\r |
251 | \r |
252 | sea=op&0x003f;\r |
253 | size=(op>>6)&3; if (size>=3) return 1;\r |
254 | \r |
255 | // See if we can do this opcode:\r |
256 | if (EaCanWrite(sea)==0||EaAn(sea)) return 1;\r |
257 | \r |
85a36a57 |
258 | use=OpBase(op,size);\r |
cc68a136 |
259 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
260 | \r |
a6785576 |
261 | OpStart(op,sea); Cycles=4;\r |
cc68a136 |
262 | \r |
263 | EaCalc ( 0,0x003f,sea,size,1);\r |
264 | EaRead ( 0, 0,sea,size,0x003f,1);\r |
265 | \r |
266 | ot(" adds r0,r0,#0 ;@ Defines NZ, clears CV\n");\r |
267 | ot(" mrs r9,cpsr ;@ r9=flags\n");\r |
268 | ot("\n");\r |
269 | \r |
cfb3dfa0 |
270 | OpEnd(sea);\r |
cc68a136 |
271 | return 0;\r |
272 | }\r |
273 | \r |
274 | // --------------------- Opcodes 0x4880+ ---------------------\r |
275 | // Emit an Ext opcode, 01001000 1x000nnn\r |
276 | int OpExt(int op)\r |
277 | {\r |
278 | int ea=0;\r |
279 | int size=0,use=0;\r |
280 | int shift=0;\r |
281 | \r |
282 | ea=op&0x0007;\r |
283 | size=(op>>6)&1;\r |
284 | shift=32-(8<<size);\r |
285 | \r |
85a36a57 |
286 | use=OpBase(op,size);\r |
cc68a136 |
287 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
288 | \r |
289 | OpStart(op); Cycles=4;\r |
290 | \r |
b637c56a |
291 | EaCalc (10,0x0007,ea,size+1,0,0);\r |
292 | EaRead (10, 0,ea,size+1,0x0007,0,0);\r |
cc68a136 |
293 | \r |
294 | ot(" mov r0,r0,asl #%d\n",shift);\r |
295 | ot(" adds r0,r0,#0 ;@ Defines NZ, clears CV\n");\r |
296 | ot(" mrs r9,cpsr ;@ r9=flags\n");\r |
297 | ot(" mov r1,r0,asr #%d\n",shift);\r |
298 | ot("\n");\r |
299 | \r |
b637c56a |
300 | EaWrite(10, 1,ea,size+1,0x0007,0,0);\r |
cc68a136 |
301 | \r |
302 | OpEnd();\r |
303 | return 0;\r |
304 | }\r |
305 | \r |
306 | // --------------------- Opcodes 0x50c0+ ---------------------\r |
307 | // Emit a Set cc opcode, 0101cccc 11eeeeee\r |
308 | int OpSet(int op)\r |
309 | {\r |
310 | int cc=0,ea=0;\r |
ee5e024c |
311 | int size=0,use=0,changed_cycles=0;\r |
cc68a136 |
312 | char *cond[16]=\r |
313 | {\r |
314 | "al","", "hi","ls","cc","cs","ne","eq",\r |
315 | "vc","vs","pl","mi","ge","lt","gt","le"\r |
316 | };\r |
317 | \r |
318 | cc=(op>>8)&15;\r |
319 | ea=op&0x003f;\r |
320 | \r |
321 | if ((ea&0x38)==0x08) return 1; // dbra, not scc\r |
322 | \r |
323 | // See if we can do this opcode:\r |
324 | if (EaCanWrite(ea)==0) return 1;\r |
325 | \r |
85a36a57 |
326 | use=OpBase(op,size);\r |
cc68a136 |
327 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
328 | \r |
ee5e024c |
329 | changed_cycles=ea<8 && cc>=2;\r |
330 | OpStart(op,ea,0,changed_cycles); Cycles=8;\r |
cc68a136 |
331 | if (ea<8) Cycles=4;\r |
332 | \r |
b637c56a |
333 | if (cc)\r |
334 | ot(" mov r1,#0\n");\r |
cc68a136 |
335 | \r |
b637c56a |
336 | switch (cc)\r |
cc68a136 |
337 | {\r |
b637c56a |
338 | case 0: // T\r |
339 | ot(" mvn r1,#0\n");\r |
340 | if (ea<8) Cycles+=2;\r |
341 | break;\r |
342 | case 1: // F\r |
343 | break;\r |
344 | case 2: // hi\r |
3a5e6cf8 |
345 | ot(" tst r9,#0x60000000 ;@ hi: !C && !Z\n");\r |
b637c56a |
346 | ot(" mvneq r1,r1\n");\r |
347 | if (ea<8) ot(" subeq r5,r5,#2 ;@ Extra cycles\n");\r |
348 | break;\r |
349 | case 3: // ls\r |
350 | ot(" tst r9,#0x60000000 ;@ ls: C || Z\n");\r |
351 | ot(" mvnne r1,r1\n");\r |
352 | if (ea<8) ot(" subne r5,r5,#2 ;@ Extra cycles\n");\r |
353 | break;\r |
354 | default:\r |
355 | ot(";@ Is the condition true?\n");\r |
356 | ot(" msr cpsr_flg,r9 ;@ ARM flags = 68000 flags\n");\r |
357 | ot(" mvn%s r1,r1\n",cond[cc]);\r |
358 | if (ea<8) ot(" sub%s r5,r5,#2 ;@ Extra cycles\n",cond[cc]);\r |
359 | break;\r |
cc68a136 |
360 | }\r |
361 | \r |
cc68a136 |
362 | ot("\n");\r |
363 | \r |
0e11c502 |
364 | eawrite_check_addrerr=1;\r |
b637c56a |
365 | EaCalc (0,0x003f, ea,size,0,0);\r |
366 | EaWrite(0, 1, ea,size,0x003f,0,0);\r |
cc68a136 |
367 | \r |
0e11c502 |
368 | opend_op_changes_cycles=changed_cycles;\r |
369 | OpEnd(ea,0);\r |
cc68a136 |
370 | return 0;\r |
371 | }\r |
372 | \r |
373 | // Emit a Asr/Lsr/Roxr/Ror opcode\r |
374 | static int EmitAsr(int op,int type,int dir,int count,int size,int usereg)\r |
375 | {\r |
376 | char pct[8]=""; // count\r |
377 | int shift=32-(8<<size);\r |
378 | \r |
379 | if (count>=1) sprintf(pct,"#%d",count); // Fixed count\r |
380 | \r |
381 | if (usereg)\r |
382 | {\r |
383 | ot(";@ Use Dn for count:\n");\r |
85a36a57 |
384 | ot(" and r2,r8,#0x0e00\n");\r |
cc68a136 |
385 | ot(" ldr r2,[r7,r2,lsr #7]\n");\r |
386 | ot(" and r2,r2,#63\n");\r |
387 | ot("\n");\r |
388 | strcpy(pct,"r2");\r |
389 | }\r |
390 | else if (count<0)\r |
391 | {\r |
392 | ot(" mov r2,r8,lsr #9 ;@ Get 'n'\n");\r |
393 | ot(" and r2,r2,#7\n\n"); strcpy(pct,"r2");\r |
394 | }\r |
395 | \r |
396 | // Take 2*n cycles:\r |
397 | if (count<0) ot(" sub r5,r5,r2,asl #1 ;@ Take 2*n cycles\n\n");\r |
398 | else Cycles+=count<<1;\r |
399 | \r |
400 | if (type<2)\r |
401 | {\r |
402 | // Asr/Lsr\r |
403 | if (dir==0 && size<2)\r |
404 | {\r |
405 | ot(";@ For shift right, use loworder bits for the operation:\n");\r |
406 | ot(" mov r0,r0,%s #%d\n",type?"lsr":"asr",32-(8<<size));\r |
407 | ot("\n");\r |
408 | }\r |
409 | \r |
1c88b865 |
410 | if (type==0 && dir) ot(" adds r3,r0,#0 ;@ save old value for V flag calculation, also clear V\n");\r |
cc68a136 |
411 | \r |
412 | ot(";@ Shift register:\n");\r |
413 | if (type==0) ot(" movs r0,r0,%s %s\n",dir?"asl":"asr",pct);\r |
414 | if (type==1) ot(" movs r0,r0,%s %s\n",dir?"lsl":"lsr",pct);\r |
415 | \r |
cc68a136 |
416 | OpGetFlags(0,0);\r |
417 | if (usereg) { // store X only if count is not 0\r |
418 | ot(" cmp %s,#0 ;@ shifting by 0?\n",pct);\r |
419 | ot(" biceq r9,r9,#0x20000000 ;@ if so, clear carry\n");\r |
85a36a57 |
420 | ot(" strne r9,[r7,#0x4c] ;@ else Save X bit\n");\r |
cc68a136 |
421 | } else {\r |
422 | // count will never be 0 if we use immediate\r |
85a36a57 |
423 | ot(" str r9,[r7,#0x4c] ;@ Save X bit\n");\r |
cc68a136 |
424 | }\r |
03c5768c |
425 | ot("\n");\r |
426 | \r |
427 | if (dir==0 && size<2)\r |
428 | {\r |
429 | ot(";@ restore after right shift:\n");\r |
430 | ot(" movs r0,r0,lsl #%d\n",32-(8<<size));\r |
431 | if (type)\r |
432 | ot(" orrmi r9,r9,#0x80000000 ;@ Potentially missed N flag\n");\r |
433 | ot("\n");\r |
434 | }\r |
cc68a136 |
435 | \r |
436 | if (type==0 && dir) {\r |
437 | ot(";@ calculate V flag (set if sign bit changes at anytime):\n");\r |
438 | ot(" mov r1,#0x80000000\n");\r |
439 | ot(" ands r3,r3,r1,asr %s\n", pct);\r |
440 | ot(" cmpne r3,r1,asr %s\n", pct);\r |
1c88b865 |
441 | ot(" eoreq r1,r0,r3\n"); // above check doesn't catch (-1)<<(32+), so we need this\r |
442 | ot(" tsteq r1,#0x80000000\n");\r |
cc68a136 |
443 | ot(" orrne r9,r9,#0x10000000\n");\r |
03c5768c |
444 | ot("\n");\r |
cc68a136 |
445 | }\r |
cc68a136 |
446 | }\r |
447 | \r |
448 | // --------------------------------------\r |
449 | if (type==2)\r |
450 | {\r |
451 | int wide=8<<size;\r |
452 | \r |
453 | // Roxr\r |
454 | if(count == 1) {\r |
455 | if(dir==0) {\r |
456 | if(size!=2) {\r |
a6785576 |
457 | ot(" orr r0,r0,r0,lsr #%i\n", size?16:24);\r |
458 | ot(" bic r0,r0,#0x%x\n", 1<<(32-wide));\r |
459 | }\r |
cc68a136 |
460 | GetXBit(0);\r |
461 | ot(" movs r0,r0,rrx\n");\r |
462 | OpGetFlags(0,1);\r |
463 | } else {\r |
85a36a57 |
464 | ot(" ldr r3,[r7,#0x4c]\n");\r |
cc68a136 |
465 | ot(" movs r0,r0,lsl #1\n");\r |
466 | OpGetFlags(0,1);\r |
85a36a57 |
467 | ot(" tst r3,#0x20000000\n");\r |
cc68a136 |
468 | ot(" orrne r0,r0,#0x%x\n", 1<<(32-wide));\r |
469 | ot(" bicne r9,r9,#0x40000000 ;@ clear Z in case it got there\n");\r |
470 | }\r |
471 | ot(" bic r9,r9,#0x10000000 ;@ make suve V is clear\n");\r |
472 | return 0;\r |
473 | }\r |
474 | \r |
475 | if (usereg)\r |
476 | {\r |
03c5768c |
477 | if (size==2)\r |
478 | {\r |
479 | ot(" subs r2,r2,#33\n");\r |
480 | ot(" addmis r2,r2,#33 ;@ Now r2=0-%d\n",wide);\r |
481 | }\r |
482 | else\r |
483 | {\r |
484 | ot(";@ Reduce r2 until <0:\n");\r |
485 | ot("Reduce_%.4x%s\n",op,ms?"":":");\r |
486 | ot(" subs r2,r2,#%d\n",wide+1);\r |
487 | ot(" bpl Reduce_%.4x\n",op);\r |
488 | ot(" adds r2,r2,#%d ;@ Now r2=0-%d\n",wide+1,wide);\r |
489 | }\r |
490 | ot(" beq norotx_%.4x\n",op);\r |
cc68a136 |
491 | ot("\n");\r |
492 | }\r |
493 | \r |
494 | if (usereg||count < 0)\r |
495 | {\r |
496 | if (dir) ot(" rsb r2,r2,#%d ;@ Reverse direction\n",wide+1);\r |
497 | }\r |
498 | else\r |
499 | {\r |
500 | if (dir) ot(" mov r2,#%d ;@ Reversed\n",wide+1-count);\r |
501 | else ot(" mov r2,#%d\n",count);\r |
502 | }\r |
503 | \r |
504 | if (shift) ot(" mov r0,r0,lsr #%d ;@ Shift down\n",shift);\r |
505 | \r |
03c5768c |
506 | ot("\n");\r |
507 | ot(";@ First get X bit (middle):\n");\r |
85a36a57 |
508 | ot(" ldr r3,[r7,#0x4c]\n");\r |
03c5768c |
509 | ot(" rsb r1,r2,#%d\n",wide);\r |
85a36a57 |
510 | ot(" and r3,r3,#0x20000000\n");\r |
511 | ot(" mov r3,r3,lsr #29\n");\r |
03c5768c |
512 | ot(" mov r3,r3,lsl r1\n");\r |
513 | \r |
514 | ot(";@ Rotate bits:\n");\r |
515 | ot(" orr r3,r3,r0,lsr r2 ;@ Orr right part\n");\r |
516 | ot(" rsbs r2,r2,#%d ;@ should also clear ARM V\n",wide+1);\r |
517 | ot(" orrs r0,r3,r0,lsl r2 ;@ Orr left part, set flags\n");\r |
cc68a136 |
518 | ot("\n");\r |
519 | \r |
520 | if (shift) ot(" movs r0,r0,lsl #%d ;@ Shift up and get correct NC flags\n",shift);\r |
521 | OpGetFlags(0,!usereg);\r |
cc68a136 |
522 | if (usereg) { // store X only if count is not 0\r |
85a36a57 |
523 | ot(" str r9,[r7,#0x4c] ;@ if not 0, Save X bit\n");\r |
cc68a136 |
524 | ot(" b nozerox%.4x\n",op);\r |
03c5768c |
525 | ot("norotx_%.4x%s\n",op,ms?"":":");\r |
85a36a57 |
526 | ot(" ldr r2,[r7,#0x4c]\n");\r |
cc68a136 |
527 | ot(" adds r0,r0,#0 ;@ Defines NZ, clears CV\n");\r |
528 | OpGetFlags(0,0);\r |
85a36a57 |
529 | ot(" and r2,r2,#0x20000000\n");\r |
530 | ot(" orr r9,r9,r2 ;@ C = old_X\n");\r |
cc68a136 |
531 | ot("nozerox%.4x%s\n",op,ms?"":":");\r |
532 | }\r |
533 | \r |
534 | ot("\n");\r |
535 | }\r |
536 | \r |
537 | // --------------------------------------\r |
538 | if (type==3)\r |
539 | {\r |
540 | // Ror\r |
541 | if (size<2)\r |
542 | {\r |
543 | ot(";@ Mirror value in whole 32 bits:\n");\r |
544 | if (size<=0) ot(" orr r0,r0,r0,lsr #8\n");\r |
545 | if (size<=1) ot(" orr r0,r0,r0,lsr #16\n");\r |
546 | ot("\n");\r |
547 | }\r |
548 | \r |
549 | ot(";@ Rotate register:\n");\r |
03c5768c |
550 | if (!dir) ot(" adds r0,r0,#0 ;@ first clear V and C\n"); // ARM does not clear C if rot count is 0\r |
cc68a136 |
551 | if (count<0)\r |
552 | {\r |
03c5768c |
553 | if (dir) ot(" rsb %s,%s,#32\n",pct,pct);\r |
cc68a136 |
554 | ot(" movs r0,r0,ror %s\n",pct);\r |
555 | }\r |
556 | else\r |
557 | {\r |
558 | int ror=count;\r |
559 | if (dir) ror=32-ror;\r |
560 | if (ror&31) ot(" movs r0,r0,ror #%d\n",ror);\r |
561 | }\r |
562 | \r |
563 | OpGetFlags(0,0);\r |
cc68a136 |
564 | if (dir)\r |
565 | {\r |
03c5768c |
566 | ot(" bic r9,r9,#0x30000000 ;@ clear CV\n");\r |
cc68a136 |
567 | ot(";@ Get carry bit from bit 0:\n");\r |
568 | if (usereg)\r |
569 | {\r |
570 | ot(" cmp %s,#32 ;@ rotating by 0?\n",pct);\r |
571 | ot(" tstne r0,#1 ;@ no, check bit 0\n");\r |
572 | }\r |
573 | else\r |
574 | ot(" tst r0,#1\n");\r |
575 | ot(" orrne r9,r9,#0x20000000\n");\r |
cc68a136 |
576 | }\r |
577 | ot("\n");\r |
578 | \r |
579 | }\r |
580 | // --------------------------------------\r |
581 | \r |
582 | return 0;\r |
583 | }\r |
584 | \r |
585 | // Emit a Asr/Lsr/Roxr/Ror opcode - 1110cccd xxuttnnn\r |
586 | // (ccc=count, d=direction(r,l) xx=size extension, u=use reg for count, tt=type, nnn=register Dn)\r |
587 | int OpAsr(int op)\r |
588 | {\r |
589 | int ea=0,use=0;\r |
590 | int count=0,dir=0;\r |
591 | int size=0,usereg=0,type=0;\r |
592 | \r |
cc68a136 |
593 | count =(op>>9)&7;\r |
594 | dir =(op>>8)&1;\r |
595 | size =(op>>6)&3;\r |
596 | if (size>=3) return 1; // use OpAsrEa()\r |
597 | usereg=(op>>5)&1;\r |
598 | type =(op>>3)&3;\r |
599 | \r |
600 | if (usereg==0) count=((count-1)&7)+1; // because ccc=000 means 8\r |
601 | \r |
602 | // Use the same opcode for target registers:\r |
603 | use=op&~0x0007;\r |
604 | \r |
03c5768c |
605 | // As long as count is not 8, use the same opcode for all shift counts:\r |
cc68a136 |
606 | if (usereg==0 && count!=8 && !(count==1&&type==2)) { use|=0x0e00; count=-1; }\r |
607 | if (usereg) { use&=~0x0e00; count=-1; } // Use same opcode for all Dn\r |
608 | \r |
609 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
610 | \r |
ee5e024c |
611 | OpStart(op,ea,0,count<0); Cycles=size<2?6:8;\r |
cc68a136 |
612 | \r |
613 | EaCalc(10,0x0007, ea,size,1);\r |
614 | EaRead(10, 0, ea,size,0x0007,1);\r |
615 | \r |
616 | EmitAsr(op,type,dir,count, size,usereg);\r |
617 | \r |
618 | EaWrite(10, 0, ea,size,0x0007,1);\r |
619 | \r |
0e11c502 |
620 | opend_op_changes_cycles = (count<0);\r |
621 | OpEnd(ea,0);\r |
cc68a136 |
622 | \r |
623 | return 0;\r |
624 | }\r |
625 | \r |
626 | // Asr/Lsr/Roxr/Ror etc EA - 11100ttd 11eeeeee \r |
627 | int OpAsrEa(int op)\r |
628 | {\r |
629 | int use=0,type=0,dir=0,ea=0,size=1;\r |
630 | \r |
631 | type=(op>>9)&3;\r |
632 | dir =(op>>8)&1;\r |
633 | ea = op&0x3f;\r |
634 | \r |
635 | if (ea<0x10) return 1;\r |
636 | // See if we can do this opcode:\r |
637 | if (EaCanRead(ea,0)==0) return 1;\r |
638 | if (EaCanWrite(ea)==0) return 1;\r |
639 | \r |
85a36a57 |
640 | use=OpBase(op,size);\r |
cc68a136 |
641 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
642 | \r |
a6785576 |
643 | OpStart(op,ea); Cycles=6; // EmitAsr() will add 2\r |
cc68a136 |
644 | \r |
645 | EaCalc (10,0x003f,ea,size,1);\r |
646 | EaRead (10, 0,ea,size,0x003f,1);\r |
647 | \r |
648 | EmitAsr(op,type,dir,1,size,0);\r |
649 | \r |
650 | EaWrite(10, 0,ea,size,0x003f,1);\r |
651 | \r |
cfb3dfa0 |
652 | OpEnd(ea);\r |
cc68a136 |
653 | return 0;\r |
654 | }\r |
655 | \r |
c008977e |
656 | int OpTas(int op, int gen_special)\r |
cc68a136 |
657 | {\r |
658 | int ea=0;\r |
659 | int use=0;\r |
660 | \r |
661 | ea=op&0x003f;\r |
662 | \r |
663 | // See if we can do this opcode:\r |
664 | if (EaCanWrite(ea)==0 || EaAn(ea)) return 1;\r |
665 | \r |
85a36a57 |
666 | use=OpBase(op,0);\r |
cc68a136 |
667 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
668 | \r |
a6785576 |
669 | if (!gen_special) OpStart(op,ea);\r |
c008977e |
670 | else\r |
671 | ot("Op%.4x_%s\n", op, ms?"":":");\r |
672 | \r |
673 | Cycles=4;\r |
cc68a136 |
674 | if(ea>=8) Cycles+=10;\r |
675 | \r |
676 | EaCalc (10,0x003f,ea,0,1);\r |
677 | EaRead (10, 1,ea,0,0x003f,1);\r |
678 | \r |
679 | ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
680 | OpGetFlags(0,0);\r |
681 | ot("\n");\r |
682 | \r |
683 | #if CYCLONE_FOR_GENESIS\r |
684 | // the original Sega hardware ignores write-back phase (to memory only)\r |
c008977e |
685 | if (ea < 0x10 || gen_special) {\r |
cc68a136 |
686 | #endif\r |
687 | ot(" orr r1,r1,#0x80000000 ;@ set bit7\n");\r |
688 | \r |
689 | EaWrite(10, 1,ea,0,0x003f,1);\r |
690 | #if CYCLONE_FOR_GENESIS\r |
691 | }\r |
692 | #endif\r |
693 | \r |
cfb3dfa0 |
694 | OpEnd(ea);\r |
c008977e |
695 | \r |
a9a5a6e0 |
696 | #if (CYCLONE_FOR_GENESIS == 2)\r |
c008977e |
697 | if (!gen_special && ea >= 0x10) {\r |
698 | OpTas(op, 1);\r |
699 | }\r |
700 | #endif\r |
701 | \r |
cc68a136 |
702 | return 0;\r |
703 | }\r |
704 | \r |