cc68a136 |
1 | \r |
2 | #include "app.h"\r |
3 | \r |
4 | \r |
5 | // Pack our flags into r1, in SR/CCR register format\r |
6 | // trashes r0,r2\r |
7 | void OpFlagsToReg(int high)\r |
8 | {\r |
85a36a57 |
9 | ot(" ldr r0,[r7,#0x4c] ;@ X bit\n");\r |
cc68a136 |
10 | ot(" mov r1,r9,lsr #28 ;@ ____NZCV\n");\r |
11 | ot(" eor r2,r1,r1,ror #1 ;@ Bit 0=C^V\n");\r |
12 | ot(" tst r2,#1 ;@ 1 if C!=V\n");\r |
13 | ot(" eorne r1,r1,#3 ;@ ____NZVC\n");\r |
14 | ot("\n");\r |
15 | if (high) ot(" ldrb r2,[r7,#0x44] ;@ Include SR high\n");\r |
85a36a57 |
16 | ot(" and r0,r0,#0x20000000\n");\r |
17 | ot(" orr r1,r1,r0,lsr #25 ;@ ___XNZVC\n");\r |
cc68a136 |
18 | if (high) ot(" orr r1,r1,r2,lsl #8\n");\r |
19 | ot("\n");\r |
20 | }\r |
21 | \r |
22 | // Convert SR/CRR register in r0 to our flags\r |
23 | // trashes r0,r1\r |
24 | void OpRegToFlags(int high)\r |
25 | {\r |
26 | ot(" eor r1,r0,r0,ror #1 ;@ Bit 0=C^V\n");\r |
85a36a57 |
27 | ot(" mov r2,r0,lsl #25\n");\r |
cc68a136 |
28 | ot(" tst r1,#1 ;@ 1 if C!=V\n");\r |
29 | ot(" eorne r0,r0,#3 ;@ ___XNZCV\n");\r |
85a36a57 |
30 | ot(" str r2,[r7,#0x4c] ;@ Store X bit\n");\r |
cc68a136 |
31 | ot(" mov r9,r0,lsl #28 ;@ r9=NZCV...\n");\r |
32 | \r |
33 | if (high)\r |
34 | {\r |
35 | ot(" mov r0,r0,ror #8\n");\r |
36 | ot(" and r0,r0,#0xa7 ;@ only take defined bits\n");\r |
37 | ot(" strb r0,[r7,#0x44] ;@ Store SR high\n");\r |
38 | }\r |
39 | ot("\n");\r |
40 | }\r |
41 | \r |
42 | // checks for supervisor bit, if not set, jumps to SuperEnd()\r |
43 | // also sets r11 to SR high value, SuperChange() uses this\r |
44 | void SuperCheck(int op)\r |
45 | {\r |
46 | ot(" ldr r11,[r7,#0x44] ;@ Get SR high\n");\r |
47 | ot(" tst r11,#0x20 ;@ Check we are in supervisor mode\n");\r |
85a36a57 |
48 | ot(" beq WrongPrivilegeMode ;@ No\n");\r |
cc68a136 |
49 | ot("\n");\r |
50 | }\r |
51 | \r |
85a36a57 |
52 | void SuperEnd(void)\r |
cc68a136 |
53 | {\r |
85a36a57 |
54 | ot(";@ ----------\n");\r |
55 | ot(";@ tried execute privileged instruction in user mode\n");\r |
56 | ot("WrongPrivilegeMode%s\n",ms?"":":");\r |
57 | ot(" sub r4,r4,#2 ;@ last opcode wasn't executed - go back\n");\r |
cc68a136 |
58 | ot(" mov r0,#0x20 ;@ privilege violation\n");\r |
59 | ot(" bl Exception\n");\r |
60 | Cycles=34;\r |
cfb3dfa0 |
61 | OpEnd(0x10);\r |
cc68a136 |
62 | }\r |
63 | \r |
64 | // does OSP and A7 swapping if needed\r |
65 | // new or old SR (not the one already in [r7,#0x44]) should be passed in r11\r |
85a36a57 |
66 | // trashes r0,r11\r |
67 | void SuperChange(int op,int load_srh)\r |
cc68a136 |
68 | {\r |
69 | ot(";@ A7 <-> OSP?\n");\r |
85a36a57 |
70 | if (load_srh)\r |
71 | ot(" ldr r0,[r7,#0x44] ;@ Get other SR high\n");\r |
72 | ot(" eor r0,r0,r11\n");\r |
73 | ot(" tst r0,#0x20\n");\r |
cc68a136 |
74 | ot(" beq no_sp_swap%.4x\n",op);\r |
75 | ot(" ;@ swap OSP and A7:\n");\r |
76 | ot(" ldr r11,[r7,#0x3C] ;@ Get A7\n");\r |
85a36a57 |
77 | ot(" ldr r0, [r7,#0x48] ;@ Get OSP\n");\r |
cc68a136 |
78 | ot(" str r11,[r7,#0x48]\n");\r |
85a36a57 |
79 | ot(" str r0, [r7,#0x3C]\n");\r |
cc68a136 |
80 | ot("no_sp_swap%.4x%s\n", op, ms?"":":");\r |
81 | }\r |
82 | \r |
83 | \r |
84 | \r |
85 | // --------------------- Opcodes 0x1000+ ---------------------\r |
86 | // Emit a Move opcode, 00xxdddd ddssssss\r |
87 | int OpMove(int op)\r |
88 | {\r |
89 | int sea=0,tea=0;\r |
90 | int size=0,use=0;\r |
91 | int movea=0;\r |
92 | \r |
93 | // Get source and target EA\r |
94 | sea = op&0x003f;\r |
95 | tea =(op&0x01c0)>>3;\r |
96 | tea|=(op&0x0e00)>>9;\r |
97 | \r |
98 | if (tea>=8 && tea<0x10) movea=1;\r |
99 | \r |
100 | // Find size extension\r |
101 | switch (op&0x3000)\r |
102 | {\r |
103 | default: return 1;\r |
104 | case 0x1000: size=0; break;\r |
105 | case 0x3000: size=1; break;\r |
106 | case 0x2000: size=2; break;\r |
107 | }\r |
108 | \r |
109 | if (size<1 && (movea || EaAn(sea))) return 1; // move.b An,* and movea.b * are invalid\r |
110 | \r |
111 | // See if we can do this opcode:\r |
112 | if (EaCanRead (sea,size)==0) return 1;\r |
113 | if (EaCanWrite(tea )==0) return 1;\r |
114 | \r |
85a36a57 |
115 | use=OpBase(op,size);\r |
cc68a136 |
116 | if (tea<0x38) use&=~0x0e00; // Use same handler for register ?0-7\r |
117 | \r |
85a36a57 |
118 | if (tea==0x1f || tea==0x27) use|=0x0e00; // Specific handler for (a7)+ and -(a7)\r |
cc68a136 |
119 | \r |
120 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
121 | \r |
cfb3dfa0 |
122 | OpStart(op,sea,tea); Cycles=4;\r |
cc68a136 |
123 | \r |
85a36a57 |
124 | EaCalcRead(-1,1,sea,size,0x003f);\r |
cc68a136 |
125 | \r |
85a36a57 |
126 | if (movea==0)\r |
127 | {\r |
cc68a136 |
128 | ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");\r |
129 | ot(" mrs r9,cpsr ;@ r9=NZCV flags\n");\r |
130 | ot("\n");\r |
131 | }\r |
132 | \r |
133 | if (movea) size=2; // movea always expands to 32-bits\r |
134 | \r |
cc68a136 |
135 | #if SPLIT_MOVEL_PD\r |
03c5768c |
136 | EaCalc (10,0x0e00,tea,size,0,0);\r |
cc68a136 |
137 | if ((tea&0x38)==0x20 && size==2) { // -(An)\r |
cc68a136 |
138 | ot(" mov r11,r1\n");\r |
85a36a57 |
139 | ot(" add r0,r10,#2\n");\r |
03c5768c |
140 | EaWrite(0, 1,tea,1,0x0e00,0,0);\r |
141 | EaWrite(10, 11,tea,1,0x0e00,1);\r |
cc68a136 |
142 | } else {\r |
03c5768c |
143 | EaWrite(0, 1,tea,size,0x0e00,0,0);\r |
cc68a136 |
144 | }\r |
145 | #else\r |
03c5768c |
146 | EaCalc (0,0x0e00,tea,size,0,0);\r |
147 | EaWrite(0, 1,tea,size,0x0e00,0,0);\r |
cc68a136 |
148 | #endif\r |
149 | \r |
150 | #if CYCLONE_FOR_GENESIS && !MEMHANDLERS_CHANGE_CYCLES\r |
151 | // this is a bit hacky\r |
152 | if ((tea==0x39||(tea&0x38)==0x10)&&size>=1)\r |
153 | ot(" ldr r5,[r7,#0x5c] ;@ Load Cycles\n");\r |
154 | #endif\r |
155 | \r |
156 | if((tea&0x38)==0x20) Cycles-=2; // less cycles when dest is -(An)\r |
157 | \r |
cfb3dfa0 |
158 | OpEnd(sea,tea);\r |
cc68a136 |
159 | return 0;\r |
160 | }\r |
161 | \r |
162 | // --------------------- Opcodes 0x41c0+ ---------------------\r |
163 | // Emit an Lea opcode, 0100nnn1 11aaaaaa\r |
164 | int OpLea(int op)\r |
165 | {\r |
166 | int use=0;\r |
167 | int sea=0,tea=0;\r |
168 | \r |
169 | sea= op&0x003f;\r |
170 | tea=(op&0x0e00)>>9; tea|=8;\r |
171 | \r |
172 | if (EaCanRead(sea,-1)==0) return 1; // See if we can do this opcode\r |
173 | \r |
85a36a57 |
174 | use=OpBase(op,0);\r |
cc68a136 |
175 | use&=~0x0e00; // Also use 1 handler for target ?0-7\r |
176 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
177 | \r |
cfb3dfa0 |
178 | OpStart(op,sea,tea);\r |
cc68a136 |
179 | \r |
180 | EaCalc (1,0x003f,sea,0); // Lea\r |
03c5768c |
181 | EaCalc (0,0x0e00,tea,2);\r |
182 | EaWrite(0, 1,tea,2,0x0e00);\r |
cc68a136 |
183 | \r |
184 | Cycles=Ea_add_ns(g_lea_cycle_table,sea);\r |
185 | \r |
cfb3dfa0 |
186 | OpEnd(sea,tea);\r |
cc68a136 |
187 | \r |
188 | return 0;\r |
189 | }\r |
190 | \r |
191 | // --------------------- Opcodes 0x40c0+ ---------------------\r |
192 | // Move SR opcode, 01000tt0 11aaaaaa move SR\r |
193 | int OpMoveSr(int op)\r |
194 | {\r |
195 | int type=0,ea=0;\r |
196 | int use=0,size=1;\r |
197 | \r |
198 | type=(op>>9)&3; // from SR, from CCR, to CCR, to SR\r |
199 | ea=op&0x3f;\r |
200 | \r |
201 | if(EaAn(ea)) return 1; // can't use An regs\r |
202 | \r |
203 | switch(type)\r |
204 | {\r |
205 | case 0:\r |
206 | if (EaCanWrite(ea)==0) return 1; // See if we can do this opcode:\r |
207 | break;\r |
208 | \r |
209 | case 1:\r |
210 | return 1; // no such op in 68000\r |
211 | \r |
a6785576 |
212 | case 2: case 3:\r |
cc68a136 |
213 | if (EaCanRead(ea,size)==0) return 1; // See if we can do this opcode:\r |
214 | break;\r |
215 | }\r |
216 | \r |
85a36a57 |
217 | use=OpBase(op,size);\r |
cc68a136 |
218 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
219 | \r |
a6785576 |
220 | OpStart(op,ea);\r |
cc68a136 |
221 | Cycles=12;\r |
222 | if (type==0) Cycles=(ea>=8)?8:6;\r |
223 | \r |
224 | if (type==3) SuperCheck(op); // 68000 model allows reading whole SR in user mode (but newer models don't)\r |
225 | \r |
226 | if (type==0 || type==1)\r |
227 | {\r |
228 | OpFlagsToReg(type==0);\r |
b637c56a |
229 | EaCalc (0,0x003f,ea,size,0,0);\r |
230 | EaWrite(0, 1,ea,size,0x003f,0,0);\r |
cc68a136 |
231 | }\r |
232 | \r |
233 | if (type==2 || type==3)\r |
234 | {\r |
85a36a57 |
235 | EaCalcReadNoSE(-1,0,ea,size,0x003f);\r |
cc68a136 |
236 | OpRegToFlags(type==3);\r |
237 | if (type==3) {\r |
85a36a57 |
238 | SuperChange(op,0);\r |
a6785576 |
239 | CheckInterrupt(op);\r |
240 | }\r |
cc68a136 |
241 | }\r |
242 | \r |
cfb3dfa0 |
243 | OpEnd(ea);\r |
cc68a136 |
244 | \r |
cc68a136 |
245 | return 0;\r |
246 | }\r |
247 | \r |
248 | \r |
249 | // Ori/Andi/Eori $nnnn,sr 0000t0t0 01111100\r |
250 | int OpArithSr(int op)\r |
251 | {\r |
252 | int type=0,ea=0;\r |
253 | int use=0,size=0;\r |
254 | \r |
255 | type=(op>>9)&5; if (type==4) return 1;\r |
256 | size=(op>>6)&1; // ccr or sr?\r |
257 | ea=0x3c;\r |
258 | \r |
85a36a57 |
259 | use=OpBase(op,size);\r |
cc68a136 |
260 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
261 | \r |
a6785576 |
262 | OpStart(op,ea); Cycles=16;\r |
cc68a136 |
263 | \r |
264 | if (size) SuperCheck(op);\r |
265 | \r |
b637c56a |
266 | EaCalc(10,0x003f,ea,size);\r |
267 | EaRead(10, 10,ea,size,0x003f);\r |
cc68a136 |
268 | \r |
269 | OpFlagsToReg(size);\r |
270 | if (type==0) ot(" orr r0,r1,r10\n");\r |
271 | if (type==1) ot(" and r0,r1,r10\n");\r |
272 | if (type==5) ot(" eor r0,r1,r10\n");\r |
273 | OpRegToFlags(size);\r |
274 | if (size) {\r |
85a36a57 |
275 | SuperChange(op,0);\r |
cc68a136 |
276 | CheckInterrupt(op);\r |
277 | }\r |
278 | \r |
cfb3dfa0 |
279 | OpEnd(ea);\r |
cc68a136 |
280 | \r |
281 | return 0;\r |
282 | }\r |
283 | \r |
284 | // --------------------- Opcodes 0x4850+ ---------------------\r |
285 | // Emit an Pea opcode, 01001000 01aaaaaa\r |
286 | int OpPea(int op)\r |
287 | {\r |
288 | int use=0;\r |
289 | int ea=0;\r |
290 | \r |
291 | ea=op&0x003f; if (ea<0x10) return 1; // Swap opcode\r |
292 | if (EaCanRead(ea,-1)==0) return 1; // See if we can do this opcode:\r |
293 | \r |
85a36a57 |
294 | use=OpBase(op,0);\r |
cc68a136 |
295 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
296 | \r |
a6785576 |
297 | OpStart(op,ea);\r |
cc68a136 |
298 | \r |
299 | ot(" ldr r10,[r7,#0x3c]\n");\r |
300 | EaCalc (1,0x003f, ea,0);\r |
301 | ot("\n");\r |
302 | ot(" sub r0,r10,#4 ;@ Predecrement A7\n");\r |
303 | ot(" str r0,[r7,#0x3c] ;@ Save A7\n");\r |
304 | ot("\n");\r |
305 | MemHandler(1,2); // Write 32-bit\r |
306 | ot("\n");\r |
307 | \r |
308 | Cycles=6+Ea_add_ns(g_pea_cycle_table,ea);\r |
309 | \r |
cfb3dfa0 |
310 | OpEnd(ea);\r |
cc68a136 |
311 | \r |
312 | return 0;\r |
313 | }\r |
314 | \r |
315 | // --------------------- Opcodes 0x4880+ ---------------------\r |
316 | // Emit a Movem opcode, 01001d00 1xeeeeee regmask\r |
317 | int OpMovem(int op)\r |
318 | {\r |
319 | int size=0,ea=0,cea=0,dir=0;\r |
320 | int use=0,decr=0,change=0;\r |
321 | \r |
322 | size=((op>>6)&1)+1; // word, long\r |
323 | ea=op&0x003f;\r |
324 | dir=(op>>10)&1; // Direction (1==ea2reg)\r |
325 | \r |
326 | if (dir) {\r |
327 | if (ea<0x10 || ea>0x3b || (ea&0x38)==0x20) return 1; // Invalid EA\r |
328 | } else {\r |
329 | if (ea<0x10 || ea>0x39 || (ea&0x38)==0x18) return 1;\r |
330 | }\r |
331 | \r |
332 | if ((ea&0x38)==0x18 || (ea&0x38)==0x20) change=1;\r |
333 | if ((ea&0x38)==0x20) decr=1; // -(An), bitfield is decr\r |
334 | \r |
335 | cea=ea; if (change) cea=0x10;\r |
336 | \r |
85a36a57 |
337 | use=OpBase(op,size);\r |
cc68a136 |
338 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
339 | \r |
a6785576 |
340 | OpStart(op,ea);\r |
cc68a136 |
341 | \r |
cc68a136 |
342 | ot(" ldrh r11,[r4],#2 ;@ r11=register mask\n");\r |
343 | \r |
cc68a136 |
344 | ot(";@ r10=Register Index*4:\n");\r |
b637c56a |
345 | if (decr) ot(" mov r10,#0x40 ;@ order reversed for -(An)\n");\r |
346 | else ot(" mov r10,#-4\n");\r |
cc68a136 |
347 | \r |
348 | ot("\n");\r |
b637c56a |
349 | ot(";@ Get the address into r6:\n");\r |
350 | EaCalc(6,0x003f,cea,size);\r |
cc68a136 |
351 | \r |
cc68a136 |
352 | ot("\n");\r |
b637c56a |
353 | ot(" tst r11,r11\n"); // sanity check\r |
354 | ot(" beq NoRegs%.4x\n",op);\r |
cc68a136 |
355 | \r |
b637c56a |
356 | ot("\n");\r |
357 | ot("Movemloop%.4x%s\n",op, ms?"":":");\r |
358 | ot(" add r10,r10,#%d ;@ r10=Next Register\n",decr?-4:4);\r |
359 | ot(" movs r11,r11,lsr #1\n");\r |
360 | ot(" bcc Movemloop%.4x\n",op);\r |
361 | ot("\n");\r |
362 | \r |
363 | if (decr) ot(" sub r6,r6,#%d ;@ Pre-decrement address\n",1<<size);\r |
cc68a136 |
364 | \r |
365 | if (dir)\r |
366 | {\r |
367 | ot(" ;@ Copy memory to register:\n",1<<size);\r |
b637c56a |
368 | EaRead (6,0,ea,size,0x003f);\r |
cc68a136 |
369 | ot(" str r0,[r7,r10] ;@ Save value into Dn/An\n");\r |
370 | }\r |
371 | else\r |
372 | {\r |
373 | ot(" ;@ Copy register to memory:\n",1<<size);\r |
374 | ot(" ldr r1,[r7,r10] ;@ Load value from Dn/An\n");\r |
b637c56a |
375 | EaWrite(6,1,ea,size,0x003f);\r |
cc68a136 |
376 | }\r |
377 | \r |
b637c56a |
378 | if (decr==0) ot(" add r6,r6,#%d ;@ Post-increment address\n",1<<size);\r |
cc68a136 |
379 | \r |
380 | ot(" sub r5,r5,#%d ;@ Take some cycles\n",2<<size);\r |
b637c56a |
381 | ot(" tst r11,r11\n");\r |
382 | ot(" bne Movemloop%.4x\n",op);\r |
cc68a136 |
383 | ot("\n");\r |
384 | \r |
385 | if (change)\r |
386 | {\r |
387 | ot(";@ Write back address:\n");\r |
388 | EaCalc (0,0x0007,8|(ea&7),2);\r |
b637c56a |
389 | EaWrite(0, 6,8|(ea&7),2,0x0007);\r |
cc68a136 |
390 | }\r |
391 | \r |
b637c56a |
392 | ot("NoRegs%.4x%s\n",op, ms?"":":");\r |
393 | ot(" ldr r6,=CycloneJumpTab ;@ restore Opcode Jump table\n");\r |
cc68a136 |
394 | ot("\n");\r |
395 | \r |
396 | if(dir) { // er\r |
397 | if (ea==0x3a) Cycles=16; // ($nn,PC)\r |
398 | else if (ea==0x3b) Cycles=18; // ($nn,pc,Rn)\r |
a6785576 |
399 | else Cycles=12;\r |
cc68a136 |
400 | } else {\r |
401 | Cycles=8;\r |
402 | }\r |
403 | \r |
404 | Cycles+=Ea_add_ns(g_movem_cycle_table,ea);\r |
405 | \r |
cfb3dfa0 |
406 | OpEnd(ea);\r |
b637c56a |
407 | ltorg();\r |
3a5e6cf8 |
408 | ot("\n");\r |
cc68a136 |
409 | \r |
410 | return 0;\r |
411 | }\r |
412 | \r |
413 | // --------------------- Opcodes 0x4e60+ ---------------------\r |
414 | // Emit a Move USP opcode, 01001110 0110dnnn move An to/from USP\r |
415 | int OpMoveUsp(int op)\r |
416 | {\r |
417 | int use=0,dir=0;\r |
418 | \r |
419 | dir=(op>>3)&1; // Direction\r |
420 | use=op&~0x0007; // Use same opcode for all An\r |
421 | \r |
422 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
423 | \r |
424 | OpStart(op); Cycles=4;\r |
425 | \r |
426 | SuperCheck(op);\r |
427 | \r |
428 | if (dir)\r |
429 | {\r |
430 | ot(" ldr r1,[r7,#0x48] ;@ Get from USP\n\n");\r |
85a36a57 |
431 | EaCalc (0,0x000f,8,2,1);\r |
432 | EaWrite(0, 1,8,2,0x000f,1);\r |
cc68a136 |
433 | }\r |
434 | else\r |
435 | {\r |
85a36a57 |
436 | EaCalc (0,0x000f,8,2,1);\r |
437 | EaRead (0, 0,8,2,0x000f,1);\r |
cc68a136 |
438 | ot(" str r0,[r7,#0x48] ;@ Put in USP\n\n");\r |
439 | }\r |
440 | \r |
441 | OpEnd();\r |
442 | \r |
cc68a136 |
443 | return 0;\r |
444 | }\r |
445 | \r |
446 | // --------------------- Opcodes 0x7000+ ---------------------\r |
447 | // Emit a Move Quick opcode, 0111nnn0 dddddddd moveq #dd,Dn\r |
448 | int OpMoveq(int op)\r |
449 | {\r |
450 | int use=0;\r |
451 | \r |
452 | use=op&0xf100; // Use same opcode for all values\r |
453 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
454 | \r |
455 | OpStart(op); Cycles=4;\r |
456 | \r |
457 | ot(" movs r0,r8,asl #24\n");\r |
458 | ot(" and r1,r8,#0x0e00\n");\r |
459 | ot(" mov r0,r0,asr #24 ;@ Sign extended Quick value\n");\r |
460 | ot(" mrs r9,cpsr ;@ r9=NZ flags\n");\r |
461 | ot(" str r0,[r7,r1,lsr #7] ;@ Store into Dn\n");\r |
462 | ot("\n");\r |
463 | \r |
464 | OpEnd();\r |
465 | \r |
466 | return 0;\r |
467 | }\r |
468 | \r |
469 | // --------------------- Opcodes 0xc140+ ---------------------\r |
470 | // Emit a Exchange opcode:\r |
471 | // 1100ttt1 01000sss exg ds,dt\r |
472 | // 1100ttt1 01001sss exg as,at\r |
473 | // 1100ttt1 10001sss exg as,dt\r |
474 | int OpExg(int op)\r |
475 | {\r |
476 | int use=0,type=0;\r |
477 | \r |
478 | type=op&0xf8;\r |
479 | \r |
480 | if (type!=0x40 && type!=0x48 && type!=0x88) return 1; // Not an exg opcode\r |
481 | \r |
482 | use=op&0xf1f8; // Use same opcode for all values\r |
483 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler\r |
484 | \r |
485 | OpStart(op); Cycles=6;\r |
486 | \r |
487 | ot(" and r10,r8,#0x0e00 ;@ Find T register\n");\r |
488 | ot(" and r11,r8,#0x000f ;@ Find S register\n");\r |
489 | if (type==0x48) ot(" orr r10,r10,#0x1000 ;@ T is an address register\n");\r |
490 | ot("\n");\r |
491 | ot(" ldr r0,[r7,r10,lsr #7] ;@ Get T\n");\r |
492 | ot(" ldr r1,[r7,r11,lsl #2] ;@ Get S\n");\r |
493 | ot("\n");\r |
494 | ot(" str r0,[r7,r11,lsl #2] ;@ T->S\n");\r |
495 | ot(" str r1,[r7,r10,lsr #7] ;@ S->T\n"); \r |
496 | ot("\n");\r |
497 | \r |
498 | OpEnd();\r |
499 | \r |
500 | return 0;\r |
501 | }\r |
502 | \r |
503 | // ------------------------- movep -------------------------------\r |
504 | // 0000ddd1 0z001sss\r |
505 | // 0000sss1 1z001ddd (to mem)\r |
506 | int OpMovep(int op)\r |
507 | {\r |
85a36a57 |
508 | int ea=0,rea=0;\r |
509 | int size=1,use=0,dir,aadd=0;\r |
cc68a136 |
510 | \r |
511 | use=op&0xf1f8;\r |
512 | if (op!=use) { OpUse(op,use); return 0; } // Use existing handler (for all dests, srcs)\r |
513 | \r |
514 | // Get EA\r |
515 | ea = (op&0x0007)|0x28;\r |
03c5768c |
516 | rea= (op&0x0e00)>>9;\r |
cc68a136 |
517 | dir = (op>>7)&1;\r |
518 | \r |
519 | // Find size extension\r |
520 | if(op&0x0040) size=2;\r |
521 | \r |
a6785576 |
522 | OpStart(op,ea);\r |
cc68a136 |
523 | \r |
524 | if(dir) { // reg to mem\r |
03c5768c |
525 | EaCalcReadNoSE(-1,11,rea,size,0x0e00);\r |
85a36a57 |
526 | \r |
527 | EaCalc(10,0x000f,ea,size);\r |
a6785576 |
528 | if(size==2) { // if operand is long\r |
529 | ot(" mov r1,r11,lsr #24 ;@ first byte\n");\r |
85a36a57 |
530 | EaWrite(10,1,ea,0,0x000f); // store first byte\r |
531 | ot(" add r0,r10,#%i\n",(aadd+=2));\r |
a6785576 |
532 | ot(" mov r1,r11,lsr #16 ;@ second byte\n");\r |
85a36a57 |
533 | EaWrite(0,1,ea,0,0x000f); // store second byte\r |
534 | ot(" add r0,r10,#%i\n",(aadd+=2));\r |
535 | } else {\r |
536 | ot(" mov r0,r10\n");\r |
a6785576 |
537 | }\r |
538 | ot(" mov r1,r11,lsr #8 ;@ first or third byte\n");\r |
85a36a57 |
539 | EaWrite(0,1,ea,0,0x000f);\r |
540 | ot(" add r0,r10,#%i\n",(aadd+=2));\r |
a6785576 |
541 | ot(" and r1,r11,#0xff\n");\r |
85a36a57 |
542 | EaWrite(0,1,ea,0,0x000f);\r |
cc68a136 |
543 | } else { // mem to reg\r |
85a36a57 |
544 | EaCalc(10,0x000f,ea,size,1);\r |
545 | EaRead(10,11,ea,0,0x000f,1); // read first byte\r |
546 | ot(" add r0,r10,#2\n");\r |
547 | EaRead(0,1,ea,0,0x000f,1); // read second byte\r |
a6785576 |
548 | if(size==2) { // if operand is long\r |
cc68a136 |
549 | ot(" orr r11,r11,r1,lsr #8 ;@ second byte\n");\r |
85a36a57 |
550 | ot(" add r0,r10,#4\n");\r |
551 | EaRead(0,1,ea,0,0x000f,1);\r |
cc68a136 |
552 | ot(" orr r11,r11,r1,lsr #16 ;@ third byte\n");\r |
85a36a57 |
553 | ot(" add r0,r10,#6\n");\r |
554 | EaRead(0,1,ea,0,0x000f,1);\r |
555 | ot(" orr r1,r11,r1,lsr #24 ;@ fourth byte\n");\r |
a6785576 |
556 | } else {\r |
85a36a57 |
557 | ot(" orr r1,r11,r1,lsr #8 ;@ second byte\n");\r |
a6785576 |
558 | }\r |
559 | // store the result\r |
85a36a57 |
560 | EaCalc(11,0x0e00,rea,size,1); // reg number -> r11\r |
561 | EaWrite(11,1,rea,size,0x0e00,1);\r |
cc68a136 |
562 | }\r |
563 | \r |
564 | Cycles=(size==2)?24:16;\r |
cfb3dfa0 |
565 | OpEnd(ea);\r |
cc68a136 |
566 | \r |
567 | return 0;\r |
568 | }\r |
569 | \r |
570 | // Emit a Stop/Reset opcodes, 01001110 011100t0 imm\r |
571 | int OpStopReset(int op)\r |
572 | {\r |
85a36a57 |
573 | int type=(op>>1)&1; // stop/reset\r |
cc68a136 |
574 | \r |
575 | OpStart(op);\r |
576 | \r |
577 | SuperCheck(op);\r |
578 | \r |
579 | if(type) {\r |
580 | // copy immediate to SR, stop the CPU and eat all remaining cycles.\r |
581 | ot(" ldrh r0,[r4],#2 ;@ Fetch the immediate\n");\r |
cc68a136 |
582 | OpRegToFlags(1);\r |
85a36a57 |
583 | SuperChange(op,0);\r |
cc68a136 |
584 | \r |
a6785576 |
585 | ot("\n");\r |
cc68a136 |
586 | \r |
a6785576 |
587 | ot(" mov r0,#1\n");\r |
588 | ot(" str r0,[r7,#0x58] ;@ stopped\n");\r |
589 | ot("\n");\r |
cc68a136 |
590 | \r |
a6785576 |
591 | ot(" mov r5,#0 ;@ eat cycles\n");\r |
cc68a136 |
592 | Cycles = 4;\r |
a6785576 |
593 | ot("\n");\r |
cc68a136 |
594 | }\r |
595 | else\r |
596 | {\r |
597 | Cycles = 132;\r |
598 | #if USE_RESET_CALLBACK\r |
599 | ot(" str r4,[r7,#0x40] ;@ Save PC\n");\r |
600 | ot(" mov r1,r9,lsr #28\n");\r |
601 | ot(" strb r1,[r7,#0x46] ;@ Save Flags (NZCV)\n");\r |
602 | ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n");\r |
603 | ot(" ldr r11,[r7,#0x90] ;@ ResetCallback\n");\r |
604 | ot(" tst r11,r11\n");\r |
605 | ot(" movne lr,pc\n");\r |
85a36a57 |
606 | ot(" bxne r11 ;@ call ResetCallback if it is defined\n");\r |
cc68a136 |
607 | ot(" ldrb r9,[r7,#0x46] ;@ r9 = Load Flags (NZCV)\n");\r |
608 | ot(" ldr r5,[r7,#0x5c] ;@ Load Cycles\n");\r |
609 | ot(" ldr r4,[r7,#0x40] ;@ Load PC\n");\r |
610 | ot(" mov r9,r9,lsl #28\n");\r |
85a36a57 |
611 | ot("\n");\r |
cc68a136 |
612 | #endif\r |
613 | }\r |
614 | \r |
615 | OpEnd();\r |
cc68a136 |
616 | \r |
617 | return 0;\r |
618 | }\r |
cfb3dfa0 |
619 | \r |