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 |
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 |
85a36a57 |
28 | EaCalcReadNoSE((type!=6)?11:-1,0,tea,size,0x003f);\r |
29 | EaCalcReadNoSE(-1,10,sea,size,0);\r |
cc68a136 |
30 | \r |
85a36a57 |
31 | if (size<2) shiftstr=(char *)(size?",asl #16":",asl #24");\r |
32 | if (size<2) ot(" mov r0,r0,asl %i\n",size?16:24);\r |
b637c56a |
33 | \r |
cc68a136 |
34 | ot(";@ Do arithmetic:\n");\r |
35 | \r |
b637c56a |
36 | if (type==0) ot(" orr r1,r0,r10%s\n",shiftstr);\r |
37 | if (type==1) ot(" and r1,r0,r10%s\n",shiftstr);\r |
38 | if (type==2) ot(" subs r1,r0,r10%s ;@ Defines NZCV\n",shiftstr);\r |
39 | if (type==3) ot(" adds r1,r0,r10%s ;@ Defines NZCV\n",shiftstr);\r |
40 | if (type==5) ot(" eor r1,r0,r10%s\n",shiftstr);\r |
41 | if (type==6) ot(" cmp r0,r10%s ;@ Defines NZCV\n",shiftstr);\r |
cc68a136 |
42 | \r |
43 | if (type<2 || type==5) ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n"); // 0,1,5\r |
44 | \r |
45 | if (type< 2) OpGetFlags(0,0); // Ori/And\r |
46 | if (type==2) OpGetFlags(1,1); // Sub: Subtract/X-bit\r |
47 | if (type==3) OpGetFlags(0,1); // Add: X-bit\r |
48 | if (type==5) OpGetFlags(0,0); // Eor\r |
49 | if (type==6) OpGetFlags(1,0); // Cmp: Subtract\r |
50 | ot("\n");\r |
51 | \r |
52 | if (type!=6)\r |
53 | {\r |
54 | EaWrite(11, 1, tea,size,0x003f,1);\r |
55 | }\r |
56 | \r |
57 | // Correct cycles:\r |
58 | if (type==6)\r |
59 | {\r |
60 | if (size>=2 && tea<0x10) Cycles+=2;\r |
61 | }\r |
62 | else\r |
63 | {\r |
64 | if (size>=2) Cycles+=4;\r |
65 | if (tea>=8) Cycles+=4;\r |
66 | if (type==1 && size>=2 && tea<8) Cycles-=2;\r |
67 | }\r |
68 | \r |
cfb3dfa0 |
69 | OpEnd(sea,tea);\r |
cc68a136 |
70 | \r |
71 | return 0;\r |
72 | }\r |
73 | \r |
74 | // --------------------- Opcodes 0x5000+ ---------------------\r |
75 | int OpAddq(int op)\r |
76 | {\r |
77 | // 0101nnnt xxeeeeee (nnn=#8,1-7 t=addq/subq xx=size, eeeeee=EA)\r |
78 | int num=0,type=0,size=0,ea=0;\r |
79 | int use=0;\r |
80 | char count[16]="";\r |
81 | int shift=0;\r |
82 | \r |
83 | num =(op>>9)&7; if (num==0) num=8;\r |
84 | type=(op>>8)&1;\r |
85 | size=(op>>6)&3; if (size>=3) return 1;\r |
86 | ea = op&0x3f;\r |
87 | \r |
88 | // See if we can do this opcode:\r |
89 | if (EaCanRead (ea,size)==0) return 1;\r |
90 | if (EaCanWrite(ea) ==0) return 1;\r |
91 | if (size == 0 && EaAn(ea) ) return 1;\r |
92 | \r |
85a36a57 |
93 | use=OpBase(op,size,1);\r |
cc68a136 |
94 | \r |
95 | if (num!=8) use|=0x0e00; // If num is not 8, use same handler\r |
96 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
97 | \r |
a6785576 |
98 | OpStart(op,ea);\r |
cc68a136 |
99 | Cycles=ea<8?4:8;\r |
100 | if(type==0&&size==1) Cycles=ea<0x10?4:8;\r |
101 | if(size>=2) Cycles=ea<0x10?8:12;\r |
102 | \r |
103 | if (size>0 && (ea&0x38)==0x08) size=2; // addq.w #n,An is also 32-bit\r |
104 | \r |
85a36a57 |
105 | EaCalcReadNoSE(10,0,ea,size,0x003f);\r |
cc68a136 |
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 |
3a5e6cf8 |
113 | ot(" and r2,r8,#0x0e00 ;@ Get quick value\n");\r |
114 | \r |
115 | if (lsr>=0) sprintf(count,"r2,lsr #%d", lsr);\r |
116 | else sprintf(count,"r2,lsl #%d", -lsr);\r |
cc68a136 |
117 | \r |
cc68a136 |
118 | ot("\n");\r |
cc68a136 |
119 | }\r |
3a5e6cf8 |
120 | else\r |
121 | {\r |
122 | sprintf(count,"#0x%.4x",8<<shift);\r |
123 | }\r |
cc68a136 |
124 | \r |
85a36a57 |
125 | if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);\r |
126 | \r |
cc68a136 |
127 | if (type==0) ot(" adds r1,r0,%s\n",count);\r |
128 | if (type==1) ot(" subs r1,r0,%s\n",count);\r |
129 | \r |
130 | if ((ea&0x38)!=0x08) OpGetFlags(type,1);\r |
131 | ot("\n");\r |
132 | \r |
133 | EaWrite(10, 1, ea,size,0x003f,1);\r |
134 | \r |
cfb3dfa0 |
135 | OpEnd(ea);\r |
cc68a136 |
136 | \r |
137 | return 0;\r |
138 | }\r |
139 | \r |
140 | // --------------------- Opcodes 0x8000+ ---------------------\r |
141 | // 1t0tnnnd xxeeeeee (tt=type:or/sub/and/add xx=size, eeeeee=EA)\r |
142 | int OpArithReg(int op)\r |
143 | {\r |
144 | int use=0;\r |
145 | int type=0,size=0,dir=0,rea=0,ea=0;\r |
85a36a57 |
146 | char *asl="";\r |
147 | char *strop=0;\r |
cc68a136 |
148 | \r |
149 | type=(op>>12)&5;\r |
150 | rea =(op>> 9)&7;\r |
151 | dir =(op>> 8)&1; // er,re\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 && EaCanRead (ea,size)==0) return 1;\r |
159 | if (dir && EaCanWrite(ea)==0) return 1;\r |
160 | if ((size==0||!(type&1))&&EaAn(ea)) return 1;\r |
161 | \r |
85a36a57 |
162 | use=OpBase(op,size);\r |
cc68a136 |
163 | use&=~0x0e00; // Use same opcode for Dn\r |
164 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
165 | \r |
a6785576 |
166 | OpStart(op,ea); Cycles=4;\r |
cc68a136 |
167 | \r |
85a36a57 |
168 | EaCalcReadNoSE(dir?10:-1,0,ea,size,0x003f);\r |
169 | \r |
170 | EaCalcReadNoSE(dir?-1:10,1,rea,size,0x0e00);\r |
cc68a136 |
171 | \r |
172 | ot(";@ Do arithmetic:\n");\r |
85a36a57 |
173 | if (type==0) strop = "orr";\r |
174 | if (type==1) strop = (char *) (dir ? "subs" : "rsbs");\r |
175 | if (type==4) strop = "and";\r |
176 | if (type==5) strop = "adds";\r |
177 | \r |
178 | if (size==0) asl=",asl #24";\r |
179 | if (size==1) asl=",asl #16";\r |
180 | \r |
181 | if (size<2) ot(" mov r0,r0%s\n",asl);\r |
182 | ot(" %s r1,r0,r1%s\n",strop,asl);\r |
cc68a136 |
183 | \r |
184 | if ((type&1)==0) ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
185 | \r |
186 | OpGetFlags(type==1,type&1); // 1==subtract\r |
187 | ot("\n");\r |
188 | \r |
189 | ot(";@ Save result:\n");\r |
85a36a57 |
190 | if (size<2) ot(" mov r1,r1,asr #%d\n",size?16:24);\r |
191 | if (dir) EaWrite(10, 1, ea,size,0x003f,0,0);\r |
192 | else EaWrite(10, 1,rea,size,0x0e00,0,0);\r |
cc68a136 |
193 | \r |
194 | if(rea==ea) {\r |
195 | if(ea<8) Cycles=(size>=2)?8:4; else Cycles+=(size>=2)?26:14;\r |
196 | } else if(dir) {\r |
197 | Cycles+=4;\r |
198 | if(size>=2) Cycles+=4;\r |
199 | } else {\r |
200 | if(size>=2) {\r |
a6785576 |
201 | Cycles+=2;\r |
202 | if(ea<0x10||ea==0x3c) Cycles+=2;\r |
203 | }\r |
cc68a136 |
204 | }\r |
205 | \r |
cfb3dfa0 |
206 | OpEnd(ea);\r |
cc68a136 |
207 | \r |
208 | return 0;\r |
209 | }\r |
210 | \r |
211 | // --------------------- Opcodes 0x80c0+ ---------------------\r |
212 | int OpMul(int op)\r |
213 | {\r |
214 | // Div/Mul: 1m00nnns 11eeeeee (m=Mul, nnn=Register Dn, s=signed, eeeeee=EA)\r |
215 | int type=0,rea=0,sign=0,ea=0;\r |
216 | int use=0;\r |
217 | \r |
218 | type=(op>>14)&1; // div/mul\r |
219 | rea =(op>> 9)&7;\r |
220 | sign=(op>> 8)&1;\r |
221 | ea = op&0x3f;\r |
222 | \r |
223 | // See if we can do this opcode:\r |
224 | if (EaCanRead(ea,1)==0||EaAn(ea)) return 1;\r |
225 | \r |
85a36a57 |
226 | use=OpBase(op,1);\r |
cc68a136 |
227 | use&=~0x0e00; // Use same for all registers\r |
228 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
229 | \r |
a6785576 |
230 | OpStart(op,ea);\r |
cc68a136 |
231 | if(type) Cycles=54;\r |
232 | else Cycles=sign?158:140;\r |
233 | \r |
85a36a57 |
234 | EaCalcReadNoSE(-1,0,ea,1,0x003f);\r |
235 | \r |
236 | EaCalc(10,0x0e00,rea, 2);\r |
237 | EaRead(10, 2,rea, 2,0x0e00);\r |
cc68a136 |
238 | \r |
85a36a57 |
239 | ot(" movs r0,r0,asl #16\n");\r |
cc68a136 |
240 | \r |
241 | if (type==0) // div\r |
242 | {\r |
243 | // the manual says C is always cleared, but neither Musashi nor FAME do that\r |
244 | //ot(" bic r9,r9,#0x20000000 ;@ always clear C\n");\r |
cc68a136 |
245 | ot(" beq divzero%.4x ;@ division by zero\n",op);\r |
246 | ot("\n");\r |
247 | \r |
248 | if (sign)\r |
249 | {\r |
250 | ot(" mov r11,#0 ;@ r11 = 1 or 2 if the result is negative\n");\r |
251 | ot(" orrmi r11,r11,#1\n");\r |
85a36a57 |
252 | ot(" mov r0,r0,asr #16\n");\r |
253 | ot(" rsbmi r0,r0,#0 ;@ Make r0 positive\n");\r |
cc68a136 |
254 | ot("\n");\r |
255 | ot(" tst r2,r2\n");\r |
256 | ot(" orrmi r11,r11,#2\n");\r |
257 | ot(" rsbmi r2,r2,#0 ;@ Make r2 positive\n");\r |
258 | ot("\n");\r |
259 | }\r |
260 | else\r |
a6785576 |
261 | {\r |
85a36a57 |
262 | ot(" mov r0,r0,lsr #16 ;@ use only 16 bits of divisor\n");\r |
a6785576 |
263 | }\r |
cc68a136 |
264 | \r |
85a36a57 |
265 | ot(";@ Divide r2 by r0\n");\r |
cc68a136 |
266 | ot(" mov r3,#0\n");\r |
85a36a57 |
267 | ot(" mov r1,r0\n");\r |
cc68a136 |
268 | ot("\n");\r |
269 | ot(";@ Shift up divisor till it's just less than numerator\n");\r |
270 | ot("Shift%.4x%s\n",op,ms?"":":");\r |
271 | ot(" cmp r1,r2,lsr #1\n");\r |
272 | ot(" movls r1,r1,lsl #1\n");\r |
273 | ot(" bcc Shift%.4x\n",op);\r |
274 | ot("\n");\r |
275 | \r |
276 | ot("Divide%.4x%s\n",op,ms?"":":");\r |
277 | ot(" cmp r2,r1\n");\r |
278 | ot(" adc r3,r3,r3 ;@ Double r3 and add 1 if carry set\n");\r |
279 | ot(" subcs r2,r2,r1\n");\r |
85a36a57 |
280 | ot(" teq r1,r0\n");\r |
cc68a136 |
281 | ot(" movne r1,r1,lsr #1\n");\r |
282 | ot(" bne Divide%.4x\n",op);\r |
283 | ot("\n");\r |
284 | ot(";@r3==quotient,r2==remainder\n");\r |
285 | \r |
286 | if (sign)\r |
287 | {\r |
a6785576 |
288 | // sign correction\r |
cc68a136 |
289 | ot(" and r1,r11,#1\n");\r |
290 | ot(" teq r1,r11,lsr #1\n");\r |
291 | ot(" rsbne r3,r3,#0 ;@ negate if quotient is negative\n");\r |
292 | ot(" tst r11,#2\n");\r |
293 | ot(" rsbne r2,r2,#0 ;@ negate the remainder if divident was negative\n");\r |
294 | ot("\n");\r |
295 | \r |
a6785576 |
296 | // signed overflow check\r |
297 | ot(" mov r1,r3,asl #16\n");\r |
298 | ot(" cmp r3,r1,asr #16 ;@ signed overflow?\n");\r |
cc68a136 |
299 | ot(" orrne r9,r9,#0x10000000 ;@ set overflow flag\n");\r |
300 | ot(" bne endofop%.4x ;@ overflow!\n",op);\r |
301 | }\r |
a6785576 |
302 | else\r |
303 | {\r |
304 | // overflow check\r |
305 | ot(" movs r1,r3,lsr #16 ;@ check for overflow condition\n");\r |
cc68a136 |
306 | ot(" orrne r9,r9,#0x10000000 ;@ set overflow flag\n");\r |
307 | ot(" bne endofop%.4x ;@ overflow!\n",op);\r |
a6785576 |
308 | }\r |
cc68a136 |
309 | \r |
310 | ot(" mov r1,r3,lsl #16 ;@ Clip to 16-bits\n");\r |
311 | ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
312 | OpGetFlags(0,0);\r |
313 | \r |
314 | ot(" mov r1,r1,lsr #16\n");\r |
315 | ot(" orr r1,r1,r2,lsl #16 ;@ Insert remainder\n");\r |
316 | }\r |
317 | \r |
318 | if (type==1)\r |
319 | {\r |
cc68a136 |
320 | ot(";@ Get 16-bit signs right:\n");\r |
85a36a57 |
321 | ot(" mov r0,r0,%s #16\n",sign?"asr":"lsr");\r |
cc68a136 |
322 | ot(" mov r2,r2,lsl #16\n");\r |
85a36a57 |
323 | ot(" mov r2,r2,%s #16\n",sign?"asr":"lsr");\r |
cc68a136 |
324 | ot("\n");\r |
325 | \r |
85a36a57 |
326 | ot(" mul r1,r2,r0\n");\r |
cc68a136 |
327 | ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
328 | OpGetFlags(0,0);\r |
329 | }\r |
330 | ot("\n");\r |
331 | \r |
85a36a57 |
332 | EaWrite(10, 1,rea, 2,0x0e00,1);\r |
cc68a136 |
333 | \r |
85a36a57 |
334 | if (type==0) ot("endofop%.4x%s\n",op,ms?"":":");\r |
cfb3dfa0 |
335 | OpEnd(ea);\r |
cc68a136 |
336 | \r |
85a36a57 |
337 | if (type==0) // div\r |
338 | {\r |
339 | ot("divzero%.4x%s\n",op,ms?"":":");\r |
340 | ot(" mov r0,#0x14 ;@ Divide by zero\n");\r |
341 | ot(" bl Exception\n");\r |
342 | Cycles+=38;\r |
343 | OpEnd(ea);\r |
344 | ot("\n");\r |
345 | }\r |
cc68a136 |
346 | \r |
347 | return 0;\r |
348 | }\r |
349 | \r |
350 | // Get X Bit into carry - trashes r2\r |
351 | int GetXBit(int subtract)\r |
352 | {\r |
353 | ot(";@ Get X bit:\n");\r |
85a36a57 |
354 | ot(" ldr r2,[r7,#0x4c]\n");\r |
355 | if (subtract) ot(" mvn r2,r2 ;@ Invert it\n");\r |
cc68a136 |
356 | ot(" msr cpsr_flg,r2 ;@ Get into Carry\n");\r |
357 | ot("\n");\r |
358 | return 0;\r |
359 | }\r |
360 | \r |
361 | // --------------------- Opcodes 0x8100+ ---------------------\r |
362 | // 1t00ddd1 0000asss - sbcd/abcd Ds,Dd or -(As),-(Ad)\r |
363 | int OpAbcd(int op)\r |
364 | {\r |
365 | int use=0;\r |
85a36a57 |
366 | int type=0,sea=0,mem=0,dea=0;\r |
cc68a136 |
367 | \r |
368 | type=(op>>14)&1; // sbcd/abcd\r |
369 | dea =(op>> 9)&7;\r |
85a36a57 |
370 | mem =(op>> 3)&1;\r |
cc68a136 |
371 | sea = op &7;\r |
372 | \r |
85a36a57 |
373 | if (mem) { sea|=0x20; dea|=0x20; }\r |
cc68a136 |
374 | \r |
375 | use=op&~0x0e07; // Use same opcode for all registers..\r |
85a36a57 |
376 | if (sea==0x27) use|=0x0007; // ___x.b -(a7)\r |
377 | if (dea==0x27) use|=0x0e00; // ___x.b -(a7)\r |
cc68a136 |
378 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
379 | \r |
cfb3dfa0 |
380 | OpStart(op,sea,dea); Cycles=6;\r |
cc68a136 |
381 | \r |
85a36a57 |
382 | if (mem)\r |
383 | {\r |
384 | ot(";@ Get src/dest EA vals\n");\r |
385 | EaCalc (0,0x000f, sea,0,1);\r |
386 | EaRead (0, 10, sea,0,0x000f,1);\r |
387 | EaCalcReadNoSE(11,0,dea,0,0x1e00);\r |
388 | }\r |
389 | else\r |
390 | {\r |
391 | ot(";@ Get src/dest reg vals\n");\r |
392 | EaCalcReadNoSE(-1,10,sea,0,0x0007);\r |
393 | EaCalcReadNoSE(11,0,dea,0,0x0e00);\r |
394 | ot(" mov r10,r10,asl #24\n");\r |
395 | }\r |
396 | ot(" mov r1,r0,asl #24\n\n");\r |
cc68a136 |
397 | \r |
398 | ot(" bic r9,r9,#0xb1000000 ;@ clear all flags except old Z\n");\r |
399 | \r |
400 | if (type)\r |
401 | {\r |
85a36a57 |
402 | ot(" ldr r0,[r7,#0x4c] ;@ Get X bit\n");\r |
cc68a136 |
403 | ot(" mov r3,#0x00f00000\n");\r |
404 | ot(" and r2,r3,r1,lsr #4\n");\r |
85a36a57 |
405 | ot(" tst r0,#0x20000000\n");\r |
cc68a136 |
406 | ot(" and r0,r3,r10,lsr #4\n");\r |
407 | ot(" add r0,r0,r2\n");\r |
408 | ot(" addne r0,r0,#0x00100000\n");\r |
409 | // ot(" tst r0,#0x00800000\n");\r |
410 | // ot(" orreq r9,r9,#0x01000000 ;@ Undefined V behavior\n");\r |
411 | ot(" cmp r0,#0x00900000\n");\r |
412 | ot(" addhi r0,r0,#0x00600000 ;@ Decimal adjust units\n");\r |
413 | \r |
414 | ot(" mov r2,r1,lsr #28\n");\r |
415 | ot(" add r0,r0,r2,lsl #24\n");\r |
416 | ot(" mov r2,r10,lsr #28\n");\r |
417 | ot(" add r0,r0,r2,lsl #24\n");\r |
418 | ot(" cmp r0,#0x09900000\n");\r |
a6785576 |
419 | ot(" orrhi r9,r9,#0x20000000 ;@ C\n");\r |
420 | ot(" subhi r0,r0,#0x0a000000\n");\r |
421 | // ot(" and r3,r9,r0,lsr #3 ;@ Undefined V behavior part II\n");\r |
422 | // ot(" orr r9,r9,r3,lsl #4 ;@ V\n");\r |
cc68a136 |
423 | ot(" movs r0,r0,lsl #4\n");\r |
a6785576 |
424 | ot(" orrmi r9,r9,#0x90000000 ;@ Undefined N+V behavior\n"); // this is what Musashi really does\r |
425 | ot(" bicne r9,r9,#0x40000000 ;@ Z flag\n");\r |
cc68a136 |
426 | }\r |
427 | else\r |
428 | {\r |
85a36a57 |
429 | ot(" ldr r0,[r7,#0x4c] ;@ Get X bit\n");\r |
cc68a136 |
430 | ot(" mov r3,#0x00f00000\n");\r |
431 | ot(" and r2,r3,r10,lsr #4\n");\r |
85a36a57 |
432 | ot(" tst r0,#0x20000000\n");\r |
cc68a136 |
433 | ot(" and r0,r3,r1,lsr #4\n");\r |
434 | ot(" sub r0,r0,r2\n");\r |
435 | ot(" subne r0,r0,#0x00100000\n");\r |
436 | // ot(" tst r0,#0x00800000\n");\r |
437 | // ot(" orreq r9,r9,#0x01000000 ;@ Undefined V behavior\n");\r |
438 | ot(" cmp r0,#0x00900000\n");\r |
439 | ot(" subhi r0,r0,#0x00600000 ;@ Decimal adjust units\n");\r |
440 | \r |
441 | ot(" mov r2,r1,lsr #28\n");\r |
442 | ot(" add r0,r0,r2,lsl #24\n");\r |
443 | ot(" mov r2,r10,lsr #28\n");\r |
444 | ot(" sub r0,r0,r2,lsl #24\n");\r |
445 | ot(" cmp r0,#0x09900000\n");\r |
a6785576 |
446 | ot(" orrhi r9,r9,#0xa0000000 ;@ N and C\n");\r |
447 | ot(" addhi r0,r0,#0x0a000000\n");\r |
448 | // ot(" and r3,r9,r0,lsr #3 ;@ Undefined V behavior part II\n");\r |
449 | // ot(" orr r9,r9,r3,lsl #4 ;@ V\n");\r |
cc68a136 |
450 | ot(" movs r0,r0,lsl #4\n");\r |
a6785576 |
451 | // ot(" orrmi r9,r9,#0x80000000 ;@ Undefined N behavior\n");\r |
452 | ot(" bicne r9,r9,#0x40000000 ;@ Z flag\n");\r |
cc68a136 |
453 | }\r |
454 | \r |
85a36a57 |
455 | ot(" str r9,[r7,#0x4c] ;@ Save X bit\n");\r |
456 | ot("\n");\r |
cc68a136 |
457 | \r |
458 | EaWrite(11, 0, dea,0,0x0e00,1);\r |
cfb3dfa0 |
459 | OpEnd(sea,dea);\r |
cc68a136 |
460 | \r |
461 | return 0;\r |
462 | }\r |
463 | \r |
85a36a57 |
464 | // 01001000 00eeeeee - nbcd <ea>\r |
cc68a136 |
465 | int OpNbcd(int op)\r |
466 | {\r |
467 | int use=0;\r |
468 | int ea=0;\r |
469 | \r |
470 | ea=op&0x3f;\r |
471 | \r |
472 | if(EaCanWrite(ea)==0||EaAn(ea)) return 1;\r |
473 | \r |
85a36a57 |
474 | use=OpBase(op,0);\r |
cc68a136 |
475 | if(op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
476 | \r |
a6785576 |
477 | OpStart(op,ea); Cycles=6;\r |
cc68a136 |
478 | if(ea >= 8) Cycles+=2;\r |
479 | \r |
85a36a57 |
480 | EaCalcReadNoSE(10,0,ea,0,0x003f);\r |
cc68a136 |
481 | \r |
482 | // this is rewrite of Musashi's code\r |
85a36a57 |
483 | ot(" ldr r2,[r7,#0x4c]\n");\r |
484 | ot(" bic r9,r9,#0xb0000000 ;@ clear all flags, except Z\n");\r |
485 | ot(" mov r0,r0,asl #24\n");\r |
486 | ot(" and r2,r2,#0x20000000\n");\r |
487 | ot(" add r2,r0,r2,lsr #5 ;@ add X\n");\r |
cc68a136 |
488 | ot(" rsbs r1,r2,#0x9a000000 ;@ do arithmetic\n");\r |
489 | \r |
cc68a136 |
490 | ot(" orrmi r9,r9,#0x80000000 ;@ N\n");\r |
491 | ot(" cmp r1,#0x9a000000\n");\r |
492 | ot(" beq finish%.4x\n",op);\r |
493 | ot("\n");\r |
494 | \r |
495 | ot(" mvn r3,r9,lsr #3 ;@ Undefined V behavior\n",op);\r |
496 | ot(" and r2,r1,#0x0f000000\n");\r |
497 | ot(" cmp r2,#0x0a000000\n");\r |
498 | ot(" andeq r1,r1,#0xf0000000\n");\r |
499 | ot(" addeq r1,r1,#0x10000000\n");\r |
500 | ot(" and r3,r3,r1,lsr #3 ;@ Undefined V behavior part II\n",op);\r |
501 | ot(" tst r1,r1\n");\r |
502 | ot(" orr r9,r9,r3 ;@ save V\n",op);\r |
503 | ot(" bicne r9,r9,#0x40000000 ;@ Z\n");\r |
504 | ot(" orr r9,r9,#0x20000000 ;@ C\n");\r |
505 | ot("\n");\r |
506 | \r |
507 | EaWrite(10, 1, ea,0,0x3f,1);\r |
508 | \r |
509 | ot("finish%.4x%s\n",op,ms?"":":");\r |
85a36a57 |
510 | ot(" str r9,[r7,#0x4c] ;@ Save X\n");\r |
cc68a136 |
511 | \r |
cfb3dfa0 |
512 | OpEnd(ea);\r |
cc68a136 |
513 | \r |
514 | return 0;\r |
515 | }\r |
516 | \r |
517 | // --------------------- Opcodes 0x90c0+ ---------------------\r |
518 | // Suba/Cmpa/Adda 1tt1nnnx 11eeeeee (tt=type, x=size, eeeeee=Source EA)\r |
519 | int OpAritha(int op)\r |
520 | {\r |
521 | int use=0;\r |
522 | int type=0,size=0,sea=0,dea=0;\r |
85a36a57 |
523 | char *asr="";\r |
cc68a136 |
524 | \r |
525 | // Suba/Cmpa/Adda/(invalid):\r |
526 | type=(op>>13)&3; if (type>=3) return 1;\r |
527 | \r |
528 | size=(op>>8)&1; size++;\r |
529 | dea=(op>>9)&7; dea|=8; // Dest=An\r |
530 | sea=op&0x003f; // Source\r |
531 | \r |
532 | // See if we can do this opcode:\r |
533 | if (EaCanRead(sea,size)==0) return 1;\r |
534 | \r |
85a36a57 |
535 | use=OpBase(op,size);\r |
cc68a136 |
536 | use&=~0x0e00; // Use same opcode for An\r |
537 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
538 | \r |
a6785576 |
539 | OpStart(op,sea); Cycles=(size==2)?6:8;\r |
cc68a136 |
540 | if(size==2&&(sea<0x10||sea==0x3c)) Cycles+=2;\r |
541 | if(type==1) Cycles=6;\r |
542 | \r |
b637c56a |
543 | // must calculate reg EA first, because of situations like: suba.w (A0)+, A0\r |
85a36a57 |
544 | EaCalc (10,0x1e00, dea,2,1);\r |
545 | EaRead (10, 11, dea,2,0x1e00);\r |
546 | \r |
547 | EaCalc ( 0,0x003f, sea,size,1);\r |
548 | EaRead ( 0, 0, sea,size,0x003f,1);\r |
cc68a136 |
549 | \r |
85a36a57 |
550 | if (size<2) asr=(char *)(size?",asr #16":",asr #24");\r |
cc68a136 |
551 | \r |
85a36a57 |
552 | if (type==0) ot(" sub r11,r11,r0%s\n",asr);\r |
553 | if (type==1) ot(" cmp r11,r0%s ;@ Defines NZCV\n",asr);\r |
cc68a136 |
554 | if (type==1) OpGetFlags(1,0); // Get Cmp flags\r |
85a36a57 |
555 | if (type==2) ot(" add r11,r11,r0%s\n",asr);\r |
cc68a136 |
556 | ot("\n");\r |
557 | \r |
b637c56a |
558 | if (type!=1) EaWrite(10, 11, dea,2,0x0e00,1);\r |
cc68a136 |
559 | \r |
cfb3dfa0 |
560 | OpEnd(sea);\r |
cc68a136 |
561 | \r |
562 | return 0;\r |
563 | }\r |
564 | \r |
565 | // --------------------- Opcodes 0x9100+ ---------------------\r |
566 | // Emit a Subx/Addx opcode, 1t01ddd1 zz00rsss addx.z Ds,Dd\r |
567 | int OpAddx(int op)\r |
568 | {\r |
569 | int use=0;\r |
570 | int type=0,size=0,dea=0,sea=0,mem=0;\r |
85a36a57 |
571 | char *asl="";\r |
cc68a136 |
572 | \r |
85a36a57 |
573 | type=(op>>14)&1;\r |
cc68a136 |
574 | dea =(op>> 9)&7;\r |
575 | size=(op>> 6)&3; if (size>=3) return 1;\r |
576 | sea = op&7;\r |
577 | mem =(op>> 3)&1;\r |
578 | \r |
579 | // See if we can do this opcode:\r |
580 | if (EaCanRead(sea,size)==0) return 1;\r |
581 | if (EaCanWrite(dea)==0) return 1;\r |
582 | \r |
583 | if(mem) { sea+=0x20; dea+=0x20; }\r |
584 | \r |
585 | use=op&~0x0e07; // Use same opcode for Dn\r |
85a36a57 |
586 | if (size==0&&sea==0x27) use|=0x0007; // ___x.b -(a7)\r |
587 | if (size==0&&dea==0x27) use|=0x0e00; // ___x.b -(a7)\r |
cc68a136 |
588 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
589 | \r |
cfb3dfa0 |
590 | OpStart(op,sea,dea); Cycles=4;\r |
cc68a136 |
591 | if(size>=2) Cycles+=4;\r |
592 | if(sea>=0x10) Cycles+=2;\r |
593 | \r |
85a36a57 |
594 | if (mem)\r |
595 | {\r |
596 | ot(";@ Get src/dest EA vals\n");\r |
597 | EaCalc (0,0x000f, sea,size,1);\r |
598 | EaRead (0, 11, sea,size,0x000f,1);\r |
599 | EaCalcReadNoSE(10,0,dea,size,0x1e00);\r |
600 | }\r |
601 | else\r |
602 | {\r |
603 | ot(";@ Get src/dest reg vals\n");\r |
604 | EaCalcReadNoSE(-1,11,sea,size,0x0007);\r |
605 | EaCalcReadNoSE(10,0,dea,size,0x0e00);\r |
606 | if (size<2) ot(" mov r11,r11,asl #%d\n\n",size?16:24);\r |
607 | }\r |
608 | \r |
609 | if (size<2) asl=(char *)(size?",asl #16":",asl #24");\r |
cc68a136 |
610 | \r |
611 | ot(";@ Do arithmetic:\n");\r |
85a36a57 |
612 | GetXBit(type==0);\r |
cc68a136 |
613 | \r |
85a36a57 |
614 | if (type==1 && size<2)\r |
cc68a136 |
615 | {\r |
616 | ot(";@ Make sure the carry bit will tip the balance:\n");\r |
a6785576 |
617 | ot(" mvn r2,#0\n");\r |
cc68a136 |
618 | ot(" orr r11,r11,r2,lsr #%i\n",(size==0)?8:16);\r |
619 | ot("\n");\r |
620 | }\r |
621 | \r |
85a36a57 |
622 | if (type==0) ot(" rscs r1,r11,r0%s\n",asl);\r |
623 | if (type==1) ot(" adcs r1,r11,r0%s\n",asl);\r |
cc68a136 |
624 | ot(" orr r3,r9,#0xb0000000 ;@ for old Z\n");\r |
85a36a57 |
625 | OpGetFlags(type==0,1,0); // subtract\r |
cc68a136 |
626 | if (size<2) {\r |
627 | ot(" movs r2,r1,lsr #%i\n", size?16:24);\r |
628 | ot(" orreq r9,r9,#0x40000000 ;@ add potentially missed Z\n");\r |
629 | }\r |
630 | ot(" andeq r9,r9,r3 ;@ fix Z\n");\r |
631 | ot("\n");\r |
632 | \r |
633 | ot(";@ Save result:\n");\r |
85a36a57 |
634 | EaWrite(10, 1, dea,size,0x0e00,1);\r |
cc68a136 |
635 | \r |
cfb3dfa0 |
636 | OpEnd(sea,dea);\r |
cc68a136 |
637 | \r |
638 | return 0;\r |
639 | }\r |
640 | \r |
641 | // --------------------- Opcodes 0xb000+ ---------------------\r |
642 | // Emit a Cmp/Eor opcode, 1011rrrt xxeeeeee (rrr=Dn, t=cmp/eor, xx=size extension, eeeeee=ea)\r |
643 | int OpCmpEor(int op)\r |
644 | {\r |
645 | int rea=0,eor=0;\r |
646 | int size=0,ea=0,use=0;\r |
85a36a57 |
647 | char *asl="";\r |
cc68a136 |
648 | \r |
649 | // Get EA and register EA\r |
650 | rea=(op>>9)&7;\r |
651 | eor=(op>>8)&1;\r |
652 | size=(op>>6)&3; if (size>=3) return 1;\r |
653 | ea=op&0x3f;\r |
654 | \r |
655 | if (eor && (ea>>3) == 1) return 1; // not a valid mode for eor\r |
656 | \r |
657 | // See if we can do this opcode:\r |
658 | if (EaCanRead(ea,size)==0) return 1;\r |
659 | if (eor && EaCanWrite(ea)==0) return 1;\r |
660 | if (EaAn(ea)&&(eor||size==0)) return 1;\r |
661 | \r |
85a36a57 |
662 | use=OpBase(op,size);\r |
cc68a136 |
663 | use&=~0x0e00; // Use 1 handler for register d0-7\r |
664 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
665 | \r |
a6785576 |
666 | OpStart(op,ea); Cycles=4;\r |
cc68a136 |
667 | if(eor) {\r |
668 | if(ea>8) Cycles+=4;\r |
669 | if(size>=2) Cycles+=4;\r |
670 | } else {\r |
671 | if(size>=2) Cycles+=2;\r |
672 | }\r |
673 | \r |
674 | ot(";@ Get EA into r10 and value into r0:\n");\r |
85a36a57 |
675 | EaCalcReadNoSE(eor?10:-1,0,ea,size,0x003f);\r |
cc68a136 |
676 | \r |
677 | ot(";@ Get register operand into r1:\n");\r |
85a36a57 |
678 | EaCalcReadNoSE(-1,1,rea,size,0x0e00);\r |
679 | \r |
680 | if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);\r |
681 | if (size<2) asl=(char *)(size?",asl #16":",asl #24");\r |
cc68a136 |
682 | \r |
683 | ot(";@ Do arithmetic:\n");\r |
85a36a57 |
684 | if (eor==0) ot(" rsbs r1,r0,r1%s\n",asl);\r |
cc68a136 |
685 | if (eor)\r |
686 | {\r |
85a36a57 |
687 | ot(" eor r1,r0,r1%s\n",asl);\r |
cc68a136 |
688 | ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
689 | }\r |
690 | \r |
691 | OpGetFlags(eor==0,0); // Cmp like subtract\r |
692 | ot("\n");\r |
693 | \r |
694 | if (eor) EaWrite(10, 1,ea,size,0x003f,1);\r |
695 | \r |
cfb3dfa0 |
696 | OpEnd(ea);\r |
cc68a136 |
697 | return 0;\r |
698 | }\r |
699 | \r |
700 | // Emit a Cmpm opcode, 1011ddd1 xx001sss (rrr=Adst, xx=size extension, sss=Asrc)\r |
701 | int OpCmpm(int op)\r |
702 | {\r |
703 | int size=0,sea=0,dea=0,use=0;\r |
85a36a57 |
704 | char *asl="";\r |
cc68a136 |
705 | \r |
706 | // get size, get EAs\r |
707 | size=(op>>6)&3; if (size>=3) return 1;\r |
708 | sea=(op&7)|0x18;\r |
709 | dea=(op>>9)&0x3f;\r |
710 | \r |
711 | use=op&~0x0e07; // Use 1 handler for all registers..\r |
85a36a57 |
712 | if (size==0&&sea==0x1f) use|=0x0007; // ..except (a7)+\r |
713 | if (size==0&&dea==0x1f) use|=0x0e00;\r |
cc68a136 |
714 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
715 | \r |
a6785576 |
716 | OpStart(op,sea); Cycles=4;\r |
cc68a136 |
717 | \r |
718 | ot(";@ Get src operand into r10:\n");\r |
85a36a57 |
719 | EaCalc (0,0x1e00, sea,size,1);\r |
cc68a136 |
720 | EaRead (0, 10, sea,size,0x000f,1);\r |
721 | \r |
722 | ot(";@ Get dst operand into r0:\n");\r |
85a36a57 |
723 | EaCalcReadNoSE(-1,0,dea,size,0x1e00);\r |
cc68a136 |
724 | \r |
85a36a57 |
725 | if (size<2) asl=(char *)(size?",asl #16":",asl #24");\r |
726 | \r |
727 | ot(" rsbs r0,r10,r0%s\n",asl);\r |
cc68a136 |
728 | OpGetFlags(1,0); // Cmp like subtract\r |
85a36a57 |
729 | ot("\n");\r |
cc68a136 |
730 | \r |
cfb3dfa0 |
731 | OpEnd(sea);\r |
cc68a136 |
732 | return 0;\r |
733 | }\r |
734 | \r |
735 | \r |
736 | // Emit a Chk opcode, 0100ddd1 x0eeeeee (rrr=Dn, x=size extension, eeeeee=ea)\r |
737 | int OpChk(int op)\r |
738 | {\r |
739 | int rea=0;\r |
740 | int size=0,ea=0,use=0;\r |
741 | \r |
742 | // Get EA and register EA\r |
743 | rea=(op>>9)&7;\r |
744 | if((op>>7)&1)\r |
745 | size=1; // word operation\r |
746 | else size=2; // long\r |
747 | ea=op&0x3f;\r |
748 | \r |
749 | if (EaAn(ea)) return 1; // not a valid mode\r |
750 | if (size!=1) return 1; // 000 variant only supports word\r |
751 | \r |
752 | // See if we can do this opcode:\r |
753 | if (EaCanRead(ea,size)==0) return 1;\r |
754 | \r |
85a36a57 |
755 | use=OpBase(op,size);\r |
cc68a136 |
756 | use&=~0x0e00; // Use 1 handler for register d0-7\r |
757 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
758 | \r |
a6785576 |
759 | OpStart(op,ea); Cycles=10;\r |
cc68a136 |
760 | \r |
761 | ot(";@ Get EA into r10 and value into r0:\n");\r |
85a36a57 |
762 | EaCalcReadNoSE(-1,0,ea,size,0x003f);\r |
cc68a136 |
763 | \r |
764 | ot(";@ Get register operand into r1:\n");\r |
85a36a57 |
765 | EaCalcReadNoSE(-1,1,rea,size,0x0e00);\r |
766 | \r |
767 | if (size<2) ot(" mov r0,r0,asl #%d\n",size?16:24);\r |
768 | if (size<2) ot(" mov r1,r1,asl #%d\n\n",size?16:24);\r |
cc68a136 |
769 | \r |
770 | ot(";@ get flags, including undocumented ones\n");\r |
771 | ot(" and r3,r9,#0x80000000\n");\r |
772 | ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
773 | OpGetFlags(0,0);\r |
774 | \r |
775 | ot(";@ is reg negative?\n");\r |
776 | ot(" bmi chktrap%.4x\n",op);\r |
777 | \r |
778 | ot(";@ Do arithmetic:\n");\r |
85a36a57 |
779 | ot(" bic r9,r9,#0x80000000 ;@ N\n");\r |
cc68a136 |
780 | ot(" cmp r1,r0\n");\r |
cc68a136 |
781 | ot(" bgt chktrap%.4x\n",op);\r |
782 | \r |
783 | ot(";@ old N remains\n");\r |
cc68a136 |
784 | ot(" orr r9,r9,r3\n");\r |
cfb3dfa0 |
785 | OpEnd(ea);\r |
cc68a136 |
786 | \r |
787 | ot("chktrap%.4x%s ;@ CHK exception:\n",op,ms?"":":");\r |
788 | ot(" mov r0,#0x18\n");\r |
789 | ot(" bl Exception\n");\r |
790 | Cycles+=40;\r |
cfb3dfa0 |
791 | OpEnd(ea);\r |
cc68a136 |
792 | \r |
793 | return 0;\r |
794 | }\r |
795 | \r |