6003a768 |
1 | \r |
2 | // Dave's Disa 68000 Disassembler\r |
3 | #ifndef __GNUC__\r |
4 | #pragma warning(disable:4115)\r |
5 | #endif\r |
6 | \r |
7 | #define _CRT_SECURE_NO_WARNINGS\r |
8 | #include <stdio.h>\r |
9 | #include <string.h>\r |
10 | #include "Disa.h"\r |
11 | \r |
12 | unsigned int DisaPc=0;\r |
13 | char *DisaText=NULL; // Text buffer to write in\r |
14 | static char Tasm[]="bwl?";\r |
15 | static char Comment[64]="";\r |
16 | unsigned short (CPU_CALL *DisaWord)(unsigned int a)=NULL;\r |
17 | \r |
18 | static unsigned int DisaLong(unsigned int a)\r |
19 | {\r |
20 | unsigned int d=0;\r |
21 | if (DisaWord==NULL) return d;\r |
22 | \r |
23 | d= DisaWord(a)<<16;\r |
24 | d|=DisaWord(a+2)&0xffff;\r |
25 | return d;\r |
26 | }\r |
27 | \r |
28 | // Get text version of the effective address\r |
29 | int DisaGetEa(char *t,int ea,int size)\r |
30 | {\r |
31 | ea&=0x3f; t[0]=0;\r |
32 | if ((ea&0x38)==0x00) { sprintf(t,"d%d",ea ); return 0; } // 000rrr\r |
33 | if ((ea&0x38)==0x08) { sprintf(t,"a%d",ea&7); return 0; } // 001rrr\r |
34 | if ((ea&0x38)==0x10) { sprintf(t,"(a%d)",ea&7); return 0; } // 010rrr\r |
35 | if ((ea&0x38)==0x18) { sprintf(t,"(a%d)+",ea&7); return 0; } // 011rrr\r |
36 | if ((ea&0x38)==0x20) { sprintf(t,"-(a%d)",ea&7); return 0; } // 100rrr\r |
37 | if ((ea&0x38)==0x28) { sprintf(t,"($%x,a%d)",DisaWord(DisaPc)&0xffff,ea&7); DisaPc+=2; return 0; } // 101rrr\r |
38 | \r |
39 | if ((ea&0x38)==0x30)\r |
40 | {\r |
41 | // 110nnn - An + Disp + D/An\r |
42 | int areg=0,ext=0,off=0,da=0,reg=0,wol=0,scale=0;\r |
43 | ext=DisaWord(DisaPc)&0xffff;\r |
44 | \r |
45 | areg=ea&7;\r |
46 | off=ext&0xff; da =ext&0x8000?'a':'d';\r |
47 | reg=(ext>>12)&7; wol=ext&0x0800?'l':'w';\r |
48 | scale=1<<((ext>>9)&3);\r |
49 | \r |
50 | if (scale<2) sprintf(t,"($%x,a%d,%c%d.%c)", off,areg,da,reg,wol);\r |
51 | else sprintf(t,"($%x,a%d,%c%d.%c*%d)",off,areg,da,reg,wol,scale); // 68020\r |
52 | \r |
53 | DisaPc+=2;\r |
54 | return 0;\r |
55 | }\r |
56 | \r |
57 | if (ea==0x38) { sprintf(t,"$%x.w",DisaWord(DisaPc)&0xffff); DisaPc+=2; return 0; } // 111000 - Absolute short\r |
58 | if (ea==0x39) { sprintf(t,"$%x.l",DisaLong(DisaPc)); DisaPc+=4; return 0; } // 111001 - Absolute long\r |
59 | \r |
60 | if (ea==0x3a)\r |
61 | {\r |
62 | // 111010 - PC Relative\r |
63 | int ext=DisaWord(DisaPc)&0xffff;\r |
64 | sprintf(t,"($%x,pc)",ext);\r |
65 | sprintf(Comment,"; =%x",DisaPc+(short)ext); // Comment where pc+ext is\r |
66 | DisaPc+=2;\r |
67 | return 0;\r |
68 | }\r |
69 | \r |
70 | if (ea==0x3b)\r |
71 | {\r |
72 | // 111011 - PC Relative + D/An\r |
73 | int ext=0,off=0,da=0,reg=0,wol=0,scale=0;\r |
74 | ext=DisaWord(DisaPc)&0xffff;\r |
75 | \r |
76 | off=ext&0xff; da =ext&0x8000?'a':'d';\r |
77 | reg=(ext>>12)&7; wol=ext&0x0800?'l':'w';\r |
78 | scale=1<<((ext>>9)&3);\r |
79 | \r |
80 | if (scale<2) sprintf(t,"($%x,pc,%c%d.%c)", off,da,reg,wol);\r |
81 | else sprintf(t,"($%x,pc,%c%d.%c*%d)",off,da,reg,wol,scale); // 68020\r |
82 | \r |
83 | sprintf(Comment,"; =%x",DisaPc+(char)off); // Comment where pc+ext is\r |
84 | DisaPc+=2;\r |
85 | return 0;\r |
86 | }\r |
87 | \r |
88 | if (ea==0x3c)\r |
89 | {\r |
90 | // 111100 - Immediate\r |
91 | switch (size)\r |
92 | {\r |
93 | case 0: sprintf(t,"#$%x",DisaWord(DisaPc)&0x00ff); DisaPc+=2; return 0;\r |
94 | case 1: sprintf(t,"#$%x",DisaWord(DisaPc)&0xffff); DisaPc+=2; return 0;\r |
95 | case 2: sprintf(t,"#$%x",DisaLong(DisaPc) ); DisaPc+=4; return 0;\r |
96 | }\r |
97 | return 1;\r |
98 | }\r |
99 | \r |
100 | // Unknown effective address\r |
101 | sprintf(t,"ea=(%d%d%d %d%d%d)",\r |
102 | (ea>>5)&1,(ea>>4)&1,(ea>>3)&1,\r |
103 | (ea>>2)&1,(ea>>1)&1, ea &1);\r |
104 | return 1;\r |
105 | }\r |
106 | \r |
107 | static void GetOffset(char *text)\r |
108 | {\r |
109 | int off=(short)DisaWord(DisaPc); DisaPc+=2;\r |
110 | \r |
111 | if (off<0) sprintf(text,"-$%x",-off);\r |
112 | else sprintf(text,"$%x", off);\r |
113 | }\r |
114 | \r |
115 | // ================ Opcodes 0x0000+ ================\r |
116 | static int DisaArithImm(int op)\r |
117 | {\r |
118 | // Or/And/Sub/Add/Eor/Cmp Immediate 0000ttt0 xxDDDddd (tt=type, xx=size extension, DDDddd=Dest ea)\r |
119 | int dea=0;\r |
120 | char seat[64]="",deat[64]="";\r |
121 | int type=0,size=0;\r |
122 | char *arith[8]={"or","and","sub","add","?","eor","cmp","?"};\r |
123 | \r |
124 | type=(op>>9)&7; if (type==4 || type>=7) return 1;\r |
125 | size=(op>>6)&3; if (size>=3) return 1;\r |
126 | dea=op&0x3f; if (dea==0x3c) return 1;\r |
127 | \r |
128 | DisaGetEa(seat,0x3c,size);\r |
129 | DisaGetEa(deat,dea, size);\r |
130 | \r |
131 | sprintf(DisaText,"%si.%c %s, %s",arith[type],Tasm[size],seat,deat);\r |
132 | return 0;\r |
133 | }\r |
134 | \r |
135 | // ================ Opcodes 0x0108+ ================\r |
136 | static int DisaMovep(int op)\r |
137 | {\r |
138 | // movep.x (Aa),Dn - 0000nnn1 dx001aaa nn\r |
139 | int dn=0,dir=0,size=0,an=0;\r |
140 | char offset[32]="";\r |
141 | \r |
142 | dn =(op>>9)&7;\r |
143 | dir =(op>>7)&1;\r |
144 | size=(op>>6)&1; size++;\r |
145 | an = op &7;\r |
146 | \r |
147 | GetOffset(offset);\r |
148 | if (dir) sprintf(DisaText,"movep.%c d%d, (%s,a%d)",Tasm[size],dn,offset,an);\r |
149 | else sprintf(DisaText,"movep.%c (%s,a%d), d%d",Tasm[size],offset,an,dn);\r |
150 | \r |
151 | return 0;\r |
152 | }\r |
153 | \r |
154 | // ================ Opcodes 0x007c+ ================\r |
155 | static int DisaArithSr(int op)\r |
156 | {\r |
157 | // Ori/Andi/Eori $nnnn,sr 0000t0tx 0s111100\r |
158 | char *opcode[6]={"ori","andi","","","","eori"};\r |
159 | char seat[64]="";\r |
160 | int type=0,size=0;\r |
161 | \r |
162 | type=(op>>9)&5;\r |
163 | size=(op>>6)&1;\r |
164 | \r |
165 | DisaGetEa(seat,0x3c,size);\r |
166 | sprintf(DisaText,"%s.%c %s, %s", opcode[type], Tasm[size], seat, size?"sr":"ccr");\r |
167 | \r |
168 | return 0;\r |
169 | }\r |
170 | \r |
171 | // ================ Opcodes 0x0100+ ================\r |
172 | static int DisaBtstReg(int op)\r |
173 | {\r |
174 | // Btst/Bchg/Bclr/Bset 0000nnn1 tteeeeee (nn=reg number, eeeeee=Dest ea)\r |
175 | int type=0;\r |
176 | int sea=0,dea=0;\r |
177 | char seat[64]="",deat[64]="";\r |
178 | char *opcode[4]={"btst","bchg","bclr","bset"};\r |
179 | \r |
180 | sea =(op>>9)&7;\r |
181 | type=(op>>6)&3;\r |
182 | dea= op&0x3f;\r |
183 | \r |
184 | if ((dea&0x38)==0x08) return 1; // movep\r |
185 | DisaGetEa(seat,sea,0);\r |
186 | DisaGetEa(deat,dea,0);\r |
187 | \r |
188 | sprintf(DisaText,"%s %s, %s",opcode[type],seat,deat);\r |
189 | return 0;\r |
190 | }\r |
191 | \r |
192 | // ================ Opcodes 0x0800+ ================\r |
193 | static int DisaBtstImm(int op)\r |
194 | {\r |
195 | // Btst/Bchg/Bclr/Bset 00001000 tteeeeee 00 nn (eeeeee=ea, nn=bit number)\r |
196 | int type=0;\r |
197 | char seat[64]="",deat[64]="";\r |
198 | char *opcode[4]={"btst","bchg","bclr","bset"};\r |
199 | \r |
200 | type=(op>>6)&3;\r |
201 | DisaGetEa(seat, 0x3c,0);\r |
202 | DisaGetEa(deat,op&0x3f,0);\r |
203 | \r |
204 | sprintf(DisaText,"%s %s, %s",opcode[type],seat,deat);\r |
205 | return 0;\r |
206 | }\r |
207 | \r |
208 | // ================ Opcodes 0x1000+ ================\r |
209 | static int DisaMove(int op)\r |
210 | {\r |
211 | // Move 00xxdddD DDssssss (xx=size extension, ssssss=Source EA, DDDddd=Dest ea)\r |
212 | int sea=0,dea=0;\r |
213 | char inst[64]="",seat[64]="",deat[64]="";\r |
214 | char *movea="";\r |
215 | int size=0;\r |
216 | \r |
217 | if ((op&0x01c0)==0x0040) movea="a"; // See if it's a movea opcode\r |
218 | \r |
219 | // Find size extension\r |
220 | switch (op&0x3000)\r |
221 | {\r |
222 | case 0x1000: size=0; break;\r |
223 | case 0x3000: size=1; break;\r |
224 | case 0x2000: size=2; break;\r |
225 | default: return 1;\r |
226 | }\r |
227 | \r |
228 | sea = op&0x003f;\r |
229 | DisaGetEa(seat,sea,size);\r |
230 | \r |
231 | dea =(op&0x01c0)>>3;\r |
232 | dea|=(op&0x0e00)>>9;\r |
233 | DisaGetEa(deat,dea,size);\r |
234 | \r |
235 | sprintf(inst,"move%s.%c",movea,Tasm[size]);\r |
236 | sprintf(DisaText,"%s %s, %s",inst,seat,deat);\r |
237 | return 0;\r |
238 | }\r |
239 | \r |
240 | // ================ Opcodes 0x4000+ ================\r |
241 | static int DisaNeg(int op)\r |
242 | {\r |
243 | // 01000tt0 xxeeeeee (tt=negx/clr/neg/not, xx=size, eeeeee=EA)\r |
244 | char eat[64]="";\r |
245 | int type=0,size=0;\r |
246 | char *opcode[4]={"negx","clr","neg","not"};\r |
247 | \r |
248 | type=(op>>9)&3;\r |
249 | size=(op>>6)&3; if (size>=3) return 1;\r |
250 | DisaGetEa(eat,op&0x3f,size);\r |
251 | \r |
252 | sprintf(DisaText,"%s.%c %s",opcode[type],Tasm[size],eat);\r |
253 | return 0;\r |
254 | }\r |
255 | \r |
256 | // ================ Opcodes 0x40c0+ ================\r |
257 | static int DisaMoveSr(int op)\r |
258 | {\r |
259 | // 01000tt0 11eeeeee (tt=type, xx=size, eeeeee=EA)\r |
260 | int type=0,ea=0;\r |
261 | char eat[64]="";\r |
262 | \r |
263 | type=(op>>9)&3;\r |
264 | ea=op&0x3f;\r |
265 | DisaGetEa(eat,ea,1);\r |
266 | \r |
267 | switch (type)\r |
268 | {\r |
269 | default: sprintf(DisaText,"move sr, %s", eat); break;\r |
270 | case 1: sprintf(DisaText,"move ccr, %s",eat); break;\r |
271 | case 2: sprintf(DisaText,"move %s, ccr",eat); break;\r |
272 | case 3: sprintf(DisaText,"move %s, sr", eat); break;\r |
273 | }\r |
274 | return 0;\r |
275 | }\r |
276 | \r |
277 | // ================ Opcodes 0x41c0+ ================\r |
278 | static int DisaLea(int op)\r |
279 | {\r |
280 | // Lea 0100nnn1 11eeeeee (eeeeee=ea)\r |
281 | int sea=0,dea=0;\r |
282 | char seat[64]="",deat[64]="";\r |
283 | \r |
284 | sea=op&0x003f;\r |
285 | DisaGetEa(seat,sea,0);\r |
286 | \r |
287 | dea=(op>>9)&7; dea|=8;\r |
288 | DisaGetEa(deat,dea,2);\r |
289 | \r |
290 | sprintf(DisaText,"lea %s, %s",seat,deat);\r |
291 | return 0;\r |
292 | }\r |
293 | \r |
294 | static int MakeRegList(char *list,int mask,int ea)\r |
295 | {\r |
296 | int reverse=0,i=0,low=0,len=0;\r |
297 | \r |
298 | if ((ea&0x38)==0x20) reverse=1; // -(An), bitfield is reversed\r |
299 | \r |
300 | mask&=0xffff; list[0]=0;\r |
301 | \r |
302 | for (i=0;i<17;i++)\r |
303 | {\r |
304 | int bit=0;\r |
305 | \r |
306 | // Mask off bit i:\r |
307 | if (reverse) bit=0x8000>>i; else bit=1<<i;\r |
308 | bit&=mask;\r |
309 | \r |
310 | if (bit==0 || i==8)\r |
311 | {\r |
312 | // low to i-1 are a continuous section, add it:\r |
313 | char add[16]="";\r |
314 | int ad=low&8?'a':'d';\r |
315 | if (low==i-1) sprintf(add,"%c%d/", ad,low&7);\r |
316 | if (low< i-1) sprintf(add,"%c%d-%c%d/",ad,low&7, ad,(i-1)&7);\r |
317 | strcat(list,add);\r |
318 | \r |
319 | low=i; // Next section\r |
320 | }\r |
321 | \r |
322 | if (bit==0) low=i+1;\r |
323 | }\r |
324 | \r |
325 | // Knock off trailing '/'\r |
326 | len=strlen(list);\r |
327 | if (len>0) if (list[len-1]=='/') list[len-1]=0; \r |
328 | return 0;\r |
329 | }\r |
330 | \r |
331 | // ================ Opcodes 0x4840+ ================\r |
332 | static int DisaSwap(int op)\r |
333 | {\r |
334 | // Swap, 01001000 01000nnn swap Dn\r |
335 | sprintf(DisaText,"swap d%d",op&7);\r |
336 | return 0;\r |
337 | }\r |
338 | \r |
339 | // ================ Opcodes 0x4850+ ================\r |
340 | static int DisaPea(int op)\r |
341 | {\r |
342 | // Pea 01001000 01eeeeee (eeeeee=ea) pea \r |
343 | int ea=0;\r |
344 | char eat[64]="";\r |
345 | \r |
346 | ea=op&0x003f; if (ea<0x10) return 1; // swap opcode\r |
347 | DisaGetEa(eat,ea,2);\r |
348 | \r |
349 | sprintf(DisaText,"pea %s",eat);\r |
350 | return 0;\r |
351 | }\r |
352 | \r |
353 | // ================ Opcodes 0x4880+ ================\r |
354 | static int DisaExt(int op)\r |
355 | {\r |
356 | // Ext 01001000 1x000nnn (x=size, eeeeee=EA)\r |
357 | char eat[64]="";\r |
358 | int size=0;\r |
359 | \r |
360 | size=(op>>6)&1; size++;\r |
361 | DisaGetEa(eat,op&0x3f,size);\r |
362 | \r |
363 | sprintf(DisaText,"ext.%c %s",Tasm[size],eat);\r |
364 | return 0;\r |
365 | }\r |
366 | \r |
367 | // ================ Opcodes 0x4890+ ================\r |
368 | static int DisaMovem(int op)\r |
369 | {\r |
370 | // Movem 01001d00 1xeeeeee regmask d=direction, x=size, eeeeee=EA\r |
371 | int dir=0,size=0;\r |
372 | int ea=0,mask=0;\r |
373 | char list[64]="",eat[64]="";\r |
374 | \r |
375 | dir=(op>>10)&1;\r |
376 | size=((op>>6)&1)+1;\r |
377 | ea=op&0x3f; if (ea<0x10) return 1; // ext opcode\r |
378 | \r |
379 | mask=DisaWord(DisaPc)&0xffff; DisaPc+=2;\r |
380 | \r |
381 | MakeRegList(list,mask,ea); // Turn register mask into text\r |
382 | DisaGetEa(eat,ea,size);\r |
383 | \r |
384 | if (dir) sprintf(DisaText,"movem.%c %s, %s",Tasm[size],eat,list);\r |
385 | else sprintf(DisaText,"movem.%c %s, %s",Tasm[size],list,eat);\r |
386 | return 0;\r |
387 | }\r |
388 | \r |
389 | // ================ Opcodes 0x4e40+ ================\r |
390 | static int DisaTrap(int op)\r |
391 | {\r |
392 | sprintf(DisaText,"trap #%d",op&0xf);\r |
393 | return 0;\r |
394 | }\r |
395 | \r |
396 | // ================ Opcodes 0x4e50+ ================\r |
397 | static int DisaLink(int op)\r |
398 | {\r |
399 | // Link opcode, 01001110 01010nnn dd link An,#offset\r |
400 | char eat[64]="";\r |
401 | char offset[32]="";\r |
402 | \r |
403 | DisaGetEa(eat,(op&7)|8,0);\r |
404 | GetOffset(offset);\r |
405 | \r |
406 | sprintf(DisaText,"link %s,#%s",eat,offset);\r |
407 | \r |
408 | return 0;\r |
409 | }\r |
410 | \r |
411 | // ================ Opcodes 0x4e58+ ================\r |
412 | static int DisaUnlk(int op)\r |
413 | {\r |
414 | // Link opcode, 01001110 01011nnn dd unlk An\r |
415 | char eat[64]="";\r |
416 | \r |
417 | DisaGetEa(eat,(op&7)|8,0);\r |
418 | sprintf(DisaText,"unlk %s",eat);\r |
419 | \r |
420 | return 0;\r |
421 | }\r |
422 | \r |
423 | // ================ Opcodes 0x4e60+ ================\r |
424 | static int DisaMoveUsp(int op)\r |
425 | {\r |
426 | // Move USP opcode, 01001110 0110dnnn move An to/from USP (d=direction)\r |
427 | int ea=0,dir=0;\r |
428 | char eat[64]="";\r |
429 | \r |
430 | dir=(op>>3)&1;\r |
431 | ea=(op&7)|8;\r |
432 | DisaGetEa(eat,ea,0);\r |
433 | \r |
434 | if (dir) sprintf(DisaText,"move usp, %s",eat);\r |
435 | else sprintf(DisaText,"move %s, usp",eat);\r |
436 | return 0;\r |
437 | }\r |
438 | \r |
439 | // ================ Opcodes 0x4e70+ ================\r |
440 | static int Disa4E70(int op)\r |
441 | {\r |
442 | char *inst[8]={"reset","nop","stop","rte","rtd","rts","trapv","rtr"};\r |
443 | int n=0;\r |
444 | \r |
445 | n=op&7;\r |
446 | \r |
447 | sprintf(DisaText,"%s",inst[n]);\r |
448 | \r |
449 | //todo - 'stop' with 16 bit data\r |
450 | \r |
451 | return 0;\r |
452 | }\r |
453 | \r |
454 | // ================ Opcodes 0x4a00+ ================\r |
455 | static int DisaTst(int op)\r |
456 | {\r |
457 | // Tst 01001010 xxeeeeee (eeeeee=ea)\r |
458 | int ea=0;\r |
459 | char eat[64]="";\r |
460 | int size=0;\r |
461 | \r |
462 | ea=op&0x003f;\r |
463 | DisaGetEa(eat,ea,0);\r |
464 | size=(op>>6)&3; if (size>=3) return 1;\r |
465 | \r |
466 | sprintf(DisaText,"tst.%c %s",Tasm[size],eat);\r |
467 | return 0;\r |
468 | }\r |
469 | \r |
470 | // ================ Opcodes 0x4e80+ ================\r |
471 | static int DisaJsr(int op)\r |
472 | {\r |
473 | // Jsr/Jmp 0100 1110 1mEE Eeee (eeeeee=ea m=1=jmp)\r |
474 | int sea=0;\r |
475 | char seat[64]="";\r |
476 | \r |
477 | sea=op&0x003f;\r |
478 | DisaGetEa(seat,sea,0);\r |
479 | \r |
480 | sprintf(DisaText,"j%s %s", op&0x40?"mp":"sr", seat);\r |
481 | return 0;\r |
482 | }\r |
483 | \r |
484 | // ================ Opcodes 0x5000+ ================\r |
485 | static int DisaAddq(int op)\r |
486 | {\r |
487 | // 0101nnnt xxeeeeee (nnn=#8,1-7 t=addq/subq xx=size, eeeeee=EA)\r |
488 | int num=0,type=0,size=0,ea=0;\r |
489 | char eat[64]="";\r |
490 | \r |
491 | num =(op>>9)&7; if (num==0) num=8;\r |
492 | type=(op>>8)&1;\r |
493 | size=(op>>6)&3; if (size>=3) return 1;\r |
494 | ea = op&0x3f;\r |
495 | \r |
496 | DisaGetEa(eat,ea,size);\r |
497 | \r |
498 | sprintf(DisaText,"%s.%c #%d, %s",type?"subq":"addq",Tasm[size],num,eat);\r |
499 | return 0;\r |
500 | }\r |
501 | \r |
502 | // ================ Opcodes 0x50c0+ ================\r |
503 | static int DisaSet(int op)\r |
504 | {\r |
505 | // 0101cccc 11eeeeee (sxx ea)\r |
506 | static char *cond[16]=\r |
507 | {"t" ,"f", "hi","ls","cc","cs","ne","eq",\r |
508 | "vc","vs","pl","mi","ge","lt","gt","le"};\r |
509 | char *cc="";\r |
510 | int ea=0;\r |
511 | char eat[64]="";\r |
512 | \r |
513 | cc=cond[(op>>8)&0xf]; // Get condition code\r |
514 | ea=op&0x3f;\r |
515 | if ((ea&0x38)==0x08) return 1; // dbra, not scc\r |
516 | \r |
517 | DisaGetEa(eat,ea,0);\r |
518 | sprintf(DisaText,"s%s %s",cc,eat);\r |
519 | return 0;\r |
520 | }\r |
521 | \r |
522 | // ================ Opcodes 0x50c8+ ================\r |
523 | static int DisaDbra(int op)\r |
524 | {\r |
525 | // 0101cccc 11001nnn offset (dbra/dbxx Rn,offset)\r |
526 | int dea=0; char deat[64]="";\r |
527 | int pc=0,Offset=0;\r |
528 | \r |
529 | static char *BraCode[16]=\r |
530 | {"bt" ,"bra","bhi","bls","bcc","bcs","bne","beq",\r |
531 | "bvc","bvs","bpl","bmi","bge","blt","bgt","ble"};\r |
532 | char *Bra="";\r |
533 | \r |
534 | dea=op&7;\r |
535 | DisaGetEa(deat,dea,2);\r |
536 | \r |
537 | // Get condition code\r |
538 | Bra=BraCode[(op>>8)&0xf];\r |
539 | \r |
540 | // Get offset\r |
541 | pc=DisaPc;\r |
542 | Offset=(short)DisaWord(DisaPc); DisaPc+=2;\r |
543 | \r |
544 | sprintf(DisaText,"d%s %s, %x",Bra,deat,pc+Offset);\r |
545 | return 0;\r |
546 | }\r |
547 | \r |
548 | // ================ Opcodes 0x6000+ ================\r |
549 | static int DisaBranch(int op)\r |
550 | {\r |
551 | // Branch 0110cccc nn (cccc=condition)\r |
552 | int pc=0,Offset=0;\r |
553 | \r |
554 | static char *BraCode[16]=\r |
555 | {"bra","bsr","bhi","bls","bcc","bcs","bne","beq",\r |
556 | "bvc","bvs","bpl","bmi","bge","blt","bgt","ble"};\r |
557 | char *Bra="";\r |
558 | \r |
559 | // Get condition code\r |
560 | Bra=BraCode[(op>>8)&0x0f];\r |
561 | \r |
562 | // Get offset\r |
563 | pc=DisaPc;\r |
564 | Offset=(char)(op&0xff);\r |
565 | if (Offset== 0) { Offset=(short)DisaWord(DisaPc); DisaPc+=2; }\r |
566 | else if (Offset==-1) { Offset= DisaLong(DisaPc); DisaPc+=4; }\r |
567 | \r |
568 | sprintf(DisaText,"%s %x",Bra,pc+Offset);\r |
569 | return 0;\r |
570 | }\r |
571 | \r |
572 | // ================ Opcodes 0x7000+ ================\r |
573 | static int DisaMoveq(int op)\r |
574 | {\r |
575 | // Moveq 0111rrr0 nn (rrr=Dest register, nn=data)\r |
576 | \r |
577 | int dea=0; char deat[64]="";\r |
578 | char *inst="moveq";\r |
579 | int val=0;\r |
580 | \r |
581 | dea=(op>>9)&7;\r |
582 | DisaGetEa(deat,dea,2);\r |
583 | \r |
584 | val=(char)(op&0xff);\r |
585 | sprintf(DisaText,"%s #$%x, %s",inst,val,deat);\r |
586 | return 0;\r |
587 | }\r |
588 | \r |
589 | // ================ Opcodes 0x8000+ ================\r |
590 | static int DisaArithReg(int op)\r |
591 | {\r |
592 | // 1t0tnnnd xxeeeeee (tt=type:or/sub/and/add xx=size, eeeeee=EA)\r |
593 | int type=0,size=0,dir=0,rea=0,ea=0;\r |
594 | char reat[64]="",eat[64]="";\r |
595 | char *opcode[]={"or","sub","","","and","add"};\r |
596 | \r |
597 | type=(op>>12)&5;\r |
598 | rea =(op>> 9)&7;\r |
599 | dir =(op>> 8)&1;\r |
600 | size=(op>> 6)&3; if (size>=3) return 1;\r |
601 | ea = op&0x3f;\r |
602 | \r |
603 | if (dir && ea<0x10) return 1; // addx opcode\r |
604 | \r |
605 | DisaGetEa(reat,rea,size);\r |
606 | DisaGetEa( eat, ea,size);\r |
607 | \r |
608 | if (dir) sprintf(DisaText,"%s.%c %s, %s",opcode[type],Tasm[size],reat,eat);\r |
609 | else sprintf(DisaText,"%s.%c %s, %s",opcode[type],Tasm[size],eat,reat);\r |
610 | return 0;\r |
611 | }\r |
612 | \r |
613 | // ================ Opcodes 0x8100+ ================\r |
614 | static int DisaAbcd(int op)\r |
615 | {\r |
616 | // 1t00ddd1 0000asss - sbcd/abcd Ds,Dd or -(As),-(Ad)\r |
617 | int type=0;\r |
618 | int dn=0,addr=0,sn=0;\r |
619 | char *opcode[]={"sbcd","abcd"};\r |
620 | \r |
621 | type=(op>>14)&1;\r |
622 | dn =(op>> 9)&7;\r |
623 | addr=(op>> 3)&1;\r |
624 | sn = op &7;\r |
625 | \r |
626 | if (addr) sprintf(DisaText,"%s -(a%d), -(a%d)",opcode[type],sn,dn);\r |
627 | else sprintf(DisaText,"%s d%d, d%d", opcode[type],sn,dn);\r |
628 | \r |
629 | return 0;\r |
630 | }\r |
631 | \r |
632 | // ================ Opcodes 0x80c0+ ================\r |
633 | static int DisaMul(int op)\r |
634 | {\r |
635 | // Div/Mul: 1m00nnns 11eeeeee (m=Mul, nnn=Register Dn, s=signed, eeeeee=EA)\r |
636 | int type=0,rea=0,sign=0,ea=0,size=1;\r |
637 | char reat[64]="",eat[64]="";\r |
638 | char *opcode[2]={"div","mul"};\r |
639 | \r |
640 | type=(op>>14)&1; // div/mul\r |
641 | rea =(op>> 9)&7;\r |
642 | sign=(op>> 8)&1;\r |
643 | ea = op&0x3f;\r |
644 | \r |
645 | DisaGetEa(reat,rea,size);\r |
646 | DisaGetEa( eat, ea,size);\r |
647 | \r |
648 | sprintf(DisaText,"%s%c.%c %s, %s",opcode[type],sign?'s':'u',Tasm[size],eat,reat);\r |
649 | return 0;\r |
650 | }\r |
651 | \r |
652 | // ================ Opcodes 0x90c0+ ================\r |
653 | static int DisaAritha(int op)\r |
654 | {\r |
655 | // Suba/Cmpa/Adda 1tt1nnnx 11eeeeee (tt=type, x=size, eeeeee=Source EA)\r |
656 | int type=0,size=0,sea=0,dea=0;\r |
657 | char seat[64]="",deat[64]="";\r |
658 | char *aritha[4]={"suba","cmpa","adda",""};\r |
659 | \r |
660 | type=(op>>13)&3; if (type>=3) return 1;\r |
661 | size=(op>>8)&1; size++;\r |
662 | dea =(op>>9)&7; dea|=8; // Dest=An\r |
663 | sea = op&0x003f; // Source\r |
664 | \r |
665 | DisaGetEa(seat,sea,size);\r |
666 | DisaGetEa(deat,dea,size);\r |
667 | \r |
668 | sprintf(DisaText,"%s.%c %s, %s",aritha[type],Tasm[size],seat,deat);\r |
669 | return 0;\r |
670 | }\r |
671 | \r |
672 | // ================ Opcodes 0xb000+ ================\r |
673 | static int DisaCmpEor(int op)\r |
674 | {\r |
675 | // Cmp/Eor 1011rrrt xxeeeeee (rrr=Dn, t=cmp/eor, xx=size extension, eeeeee=ea)\r |
676 | char reat[64]="",eat[64]="";\r |
677 | int type=0,size=0;\r |
678 | \r |
679 | type=(op>>8)&1;\r |
680 | size=(op>>6)&3; if (size>=3) return 1; // cmpa opcode\r |
681 | if ((op&0xf138)==0xb108) return 1; // cmpm opcode\r |
682 | \r |
683 | DisaGetEa(reat,(op>>9)&7,size);\r |
684 | DisaGetEa(eat, op&0x3f, size);\r |
685 | \r |
686 | if (type) sprintf(DisaText,"eor.%c %s, %s",Tasm[size],reat,eat);\r |
687 | else sprintf(DisaText,"cmp.%c %s, %s",Tasm[size],eat,reat);\r |
688 | return 0;\r |
689 | }\r |
690 | \r |
691 | // ================ Opcodes 0xb108+ ================\r |
692 | static int DisaCmpm(int op)\r |
693 | {\r |
694 | // Cmpm 1011ddd1 xx001sss\r |
695 | int type=0,size=0,dea=0,sea=0;\r |
696 | char deat[64]="",seat[64]="";\r |
697 | \r |
698 | type=(op>>12)&5;\r |
699 | dea =(op>> 9)&7; dea|=8;\r |
700 | size=(op>> 6)&3; if (size>=3) return 1;\r |
701 | sea = op&0x3f;\r |
702 | \r |
703 | DisaGetEa(deat,dea,size);\r |
704 | DisaGetEa(seat,sea,size);\r |
705 | \r |
706 | sprintf(DisaText,"cmpm.%c (%s)+, (%s)+",Tasm[size],seat,deat);\r |
707 | \r |
708 | return 0;\r |
709 | }\r |
710 | \r |
711 | // ================ Opcodes 0xc140+ ================\r |
712 | // 1100ttt1 01000sss exg ds,dt\r |
713 | // 1100ttt1 01001sss exg as,at\r |
714 | // 1100ttt1 10001sss exg as,dt\r |
715 | static int DisaExg(int op)\r |
716 | {\r |
717 | int tr=0,type=0,sr=0;\r |
718 | \r |
719 | tr =(op>>9)&7;\r |
720 | type= op&0xf8;\r |
721 | sr = op&7;\r |
722 | \r |
723 | if (type==0x40) sprintf(DisaText,"exg d%d, d%d",sr,tr);\r |
724 | else if (type==0x48) sprintf(DisaText,"exg a%d, a%d",sr,tr);\r |
725 | else if (type==0x88) sprintf(DisaText,"exg a%d, d%d",sr,tr);\r |
726 | else return 1;\r |
727 | \r |
728 | return 0;\r |
729 | }\r |
730 | \r |
731 | // ================ Opcodes 0xd100+ ================\r |
732 | static int DisaAddx(int op)\r |
733 | {\r |
734 | // 1t01ddd1 xx000sss addx\r |
735 | int type=0,size=0,dea=0,sea=0;\r |
736 | char deat[64]="",seat[64]="";\r |
737 | char *opcode[6]={"","subx","","","","addx"};\r |
738 | \r |
739 | type=(op>>12)&5;\r |
740 | dea =(op>> 9)&7;\r |
741 | size=(op>> 6)&3; if (size>=3) return 1;\r |
742 | sea = op&0x3f;\r |
743 | \r |
744 | DisaGetEa(deat,dea,size);\r |
745 | DisaGetEa(seat,sea,size);\r |
746 | \r |
747 | sprintf(DisaText,"%s.%c %s, %s",opcode[type],Tasm[size],seat,deat);\r |
748 | return 0;\r |
749 | }\r |
750 | \r |
751 | // ================ Opcodes 0xe000+ ================\r |
752 | static char *AsrName[4]={"as","ls","rox","ro"};\r |
753 | static int DisaAsr(int op)\r |
754 | {\r |
755 | // Asr/l/Ror/l etc - 1110cccd xxuttnnn\r |
756 | // (ccc=count, d=direction xx=size extension, u=use reg for count, tt=type, nnn=register Dn)\r |
757 | int count=0,dir=0,size=0,usereg=0,type=0,num=0;\r |
758 | \r |
759 | count =(op>>9)&7;\r |
760 | dir =(op>>8)&1;\r |
761 | size =(op>>6)&3; if (size>=3) return 1; // todo Asr EA\r |
762 | usereg=(op>>5)&1;\r |
763 | type =(op>>3)&3;\r |
764 | num = op &7; // Register number\r |
765 | \r |
766 | if (usereg==0) count=((count-1)&7)+1; // because ccc=000 means 8\r |
767 | \r |
768 | sprintf(DisaText,"%s%c.%c %c%d, d%d",\r |
769 | AsrName[type], dir?'l':'r', Tasm[size],\r |
770 | usereg?'d':'#', count, num);\r |
771 | return 0;\r |
772 | }\r |
773 | \r |
774 | static int DisaAsrEa(int op)\r |
775 | {\r |
776 | // Asr/l/Ror/l etc EA - 11100ttd 11eeeeee \r |
777 | int type=0,dir=0,size=1;\r |
778 | char eat[64]="";\r |
779 | \r |
780 | type=(op>>9)&3;\r |
781 | dir =(op>>8)&1;\r |
782 | DisaGetEa(eat,op&0x3f,size);\r |
783 | \r |
784 | sprintf(DisaText,"%s%c.w %s", AsrName[type], dir?'l':'r', eat);\r |
785 | return 0;\r |
786 | }\r |
787 | \r |
788 | // =================================================================\r |
789 | \r |
790 | static int TryOp(int op)\r |
791 | {\r |
792 | if ((op&0xf100)==0x0000) DisaArithImm(op); // Ori/And/Sub/Add/Eor/Cmp Immediate\r |
793 | if ((op&0xf5bf)==0x003c) DisaArithSr(op); // Ori/Andi/Eori $nnnn,sr\r |
794 | if ((op&0xf100)==0x0100) DisaBtstReg(op);\r |
795 | if ((op&0xf138)==0x0108) DisaMovep(op);\r |
796 | if ((op&0xff00)==0x0800) DisaBtstImm(op); // Btst/Bchg/Bclr/Bset\r |
797 | if ((op&0xc000)==0x0000) DisaMove(op);\r |
798 | if ((op&0xf900)==0x4000) DisaNeg(op); // Negx/Clr/Neg/Not\r |
799 | if ((op&0xf1c0)==0x41c0) DisaLea(op);\r |
800 | if ((op&0xf9c0)==0x40c0) DisaMoveSr(op);\r |
801 | if ((op&0xfff8)==0x4840) DisaSwap(op);\r |
802 | if ((op&0xffc0)==0x4840) DisaPea(op);\r |
803 | if ((op&0xffb8)==0x4880) DisaExt(op);\r |
804 | if ((op&0xfb80)==0x4880) DisaMovem(op);\r |
805 | if ((op&0xff00)==0x4a00) DisaTst(op);\r |
806 | if ((op&0xfff0)==0x4e40) DisaTrap(op);\r |
807 | if ((op&0xfff8)==0x4e50) DisaLink(op);\r |
808 | if ((op&0xfff8)==0x4e58) DisaUnlk(op);\r |
809 | if ((op&0xfff0)==0x4e60) DisaMoveUsp(op);\r |
810 | if ((op&0xfff8)==0x4e70) Disa4E70(op);\r |
811 | if ((op&0xff80)==0x4e80) DisaJsr(op);\r |
812 | if ((op&0xf000)==0x5000) DisaAddq(op);\r |
813 | if ((op&0xf0c0)==0x50c0) DisaSet(op);\r |
814 | if ((op&0xf0f8)==0x50c8) DisaDbra(op);\r |
815 | if ((op&0xf000)==0x6000) DisaBranch(op);\r |
816 | if ((op&0xa000)==0x8000) DisaArithReg(op); // Or/Sub/And/Add\r |
817 | if ((op&0xb1f0)==0x8100) DisaAbcd(op);\r |
818 | if ((op&0xb130)==0x9100) DisaAddx(op);\r |
819 | if ((op&0xb0c0)==0x80c0) DisaMul(op);\r |
820 | if ((op&0xf100)==0x7000) DisaMoveq(op);\r |
821 | if ((op&0x90c0)==0x90c0) DisaAritha(op);\r |
822 | if ((op&0xf000)==0xb000) DisaCmpEor(op);\r |
823 | if ((op&0xf138)==0xb108) DisaCmpm(op);\r |
824 | if ((op&0xf130)==0xc100) DisaExg(op);\r |
825 | if ((op&0xf000)==0xe000) DisaAsr(op);\r |
826 | if ((op&0xf8c0)==0xe0c0) DisaAsrEa(op);\r |
827 | \r |
828 | // Unknown opcoode\r |
829 | return 0;\r |
830 | }\r |
831 | \r |
832 | int DisaGet()\r |
833 | {\r |
834 | int op=0;\r |
835 | if (DisaWord==NULL) return 1;\r |
836 | \r |
837 | Comment[0]=0;\r |
838 | DisaText[0]=0; // Assume opcode unknown\r |
839 | \r |
840 | op=DisaWord(DisaPc)&0xffff; DisaPc+=2;\r |
841 | TryOp(op);\r |
842 | strcat(DisaText,Comment);\r |
843 | \r |
844 | // Unknown opcoode\r |
845 | return 0;\r |
846 | }\r |