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NOT setting upper bits on PUSH PC, minor adjustments
[picodrive.git] / cpu / Cyclone / Main.cpp
CommitLineData
cc68a136 1\r
2#include "app.h"\r
3\r
4static FILE *AsmFile=NULL;\r
5\r
cfb3dfa0 6static int CycloneVer=0x0087; // Version number of library\r
cc68a136 7int *CyJump=NULL; // Jump table\r
8int ms=USE_MS_SYNTAX; // If non-zero, output in Microsoft ARMASM format\r
9char *Narm[4]={ "b", "h","",""}; // Normal ARM Extensions for operand sizes 0,1,2\r
10char *Sarm[4]={"sb","sh","",""}; // Sign-extend ARM Extensions for operand sizes 0,1,2\r
11int Cycles; // Current cycles for opcode\r
cfb3dfa0 12int pc_dirty; // something changed PC during processing\r
b637c56a 13static int arm_op_count;\r
cc68a136 14\r
15\r
16void ot(const char *format, ...)\r
17{\r
18 va_list valist=NULL;\r
19 int i, len;\r
20\r
21 // notaz: stop me from leaving newlines in the middle of format string\r
22 // and generating bad code\r
23 for(i=0, len=strlen(format); i < len && format[i] != '\n'; i++);\r
24 if(i < len-1 && format[len-1] != '\n') printf("\nWARNING: possible improper newline placement:\n%s\n", format);\r
25\r
b637c56a 26 if (format[0] == ' ' && format[1] == ' ' && format[2] != ' ' && format[2] != '.')\r
27 arm_op_count++;\r
28\r
cc68a136 29 va_start(valist,format);\r
30 if (AsmFile) vfprintf(AsmFile,format,valist);\r
31 va_end(valist);\r
32}\r
33\r
34void ltorg()\r
35{\r
36 if (ms) ot(" LTORG\n");\r
37 else ot(" .ltorg\n");\r
38}\r
39\r
a9a5a6e0 40#if (CYCLONE_FOR_GENESIS == 2)\r
c008977e 41// r12=ptr to tas in table, trashes r0,r1\r
42static void ChangeTAS(int norm)\r
43{\r
44 ot(" ldr r0,=Op4ad0%s\n",norm?"_":"");\r
45 ot(" mov r1,#8\n");\r
46 ot("setrtas_loop%i0%s ;@ 4ad0-4ad7\n",norm,ms?"":":");\r
47 ot(" subs r1,r1,#1\n");\r
48 ot(" str r0,[r12],#4\n");\r
49 ot(" bne setrtas_loop%i0\n",norm);\r
50 ot(" ldr r0,=Op4ad8%s\n",norm?"_":"");\r
51 ot(" mov r1,#7\n");\r
52 ot("setrtas_loop%i1%s ;@ 4ad8-4ade\n",norm,ms?"":":");\r
53 ot(" subs r1,r1,#1\n");\r
54 ot(" str r0,[r12],#4\n");\r
55 ot(" bne setrtas_loop%i1\n",norm);\r
56 ot(" ldr r0,=Op4adf%s\n",norm?"_":"");\r
57 ot(" str r0,[r12],#4\n");\r
58 ot(" ldr r0,=Op4ae0%s\n",norm?"_":"");\r
59 ot(" mov r1,#7\n");\r
60 ot("setrtas_loop%i2%s ;@ 4ae0-4ae6\n",norm,ms?"":":");\r
61 ot(" subs r1,r1,#1\n");\r
62 ot(" str r0,[r12],#4\n");\r
63 ot(" bne setrtas_loop%i2\n",norm);\r
64 ot(" ldr r0,=Op4ae7%s\n",norm?"_":"");\r
65 ot(" str r0,[r12],#4\n");\r
66 ot(" ldr r0,=Op4ae8%s\n",norm?"_":"");\r
67 ot(" mov r1,#8\n");\r
68 ot("setrtas_loop%i3%s ;@ 4ae8-4aef\n",norm,ms?"":":");\r
69 ot(" subs r1,r1,#1\n");\r
70 ot(" str r0,[r12],#4\n");\r
71 ot(" bne setrtas_loop%i3\n",norm);\r
72 ot(" ldr r0,=Op4af0%s\n",norm?"_":"");\r
73 ot(" mov r1,#8\n");\r
74 ot("setrtas_loop%i4%s ;@ 4af0-4af7\n",norm,ms?"":":");\r
75 ot(" subs r1,r1,#1\n");\r
76 ot(" str r0,[r12],#4\n");\r
77 ot(" bne setrtas_loop%i4\n",norm);\r
78 ot(" ldr r0,=Op4af8%s\n",norm?"_":"");\r
79 ot(" str r0,[r12],#4\n");\r
80 ot(" ldr r0,=Op4af9%s\n",norm?"_":"");\r
81 ot(" str r0,[r12],#4\n");\r
82}\r
83#endif\r
84\r
cc68a136 85// trashes all temp regs\r
86static void PrintException(int ints)\r
87{\r
88 if(!ints) {\r
89 ot(" ;@ Cause an Exception - Vector address in r0\n");\r
90 ot(" mov r11,r0\n");\r
91 }\r
92\r
93 ot(";@ swap OSP <-> A7?\n");\r
94 ot(" ldr r0,[r7,#0x44] ;@ Get SR high\n");\r
95 ot(" tst r0,#0x20\n");\r
96 ot(" bne no_sp_swap%i\n",ints);\r
97 ot(";@ swap OSP and A7:\n");\r
98 ot(" ldr r0,[r7,#0x3C] ;@ Get A7\n");\r
99 ot(" ldr r1,[r7,#0x48] ;@ Get OSP\n");\r
100 ot(" str r0,[r7,#0x48]\n");\r
101 ot(" str r1,[r7,#0x3C]\n");\r
102 ot("no_sp_swap%i%s\n",ints,ms?"":":");\r
103\r
104 ot(" ldr r10,[r7,#0x60] ;@ Get Memory base\n");\r
547045e3 105// ot(" mov r1,r4,lsl #8\n");\r
106// ot(" sub r1,r1,r10,lsl #8 ;@ r1 = Old PC\n");\r
107// ot(" mov r1,r1,asr #8 ;@ push sign extended\n");\r
108 ot(" sub r1,r4,r10 ;@ r1 = Old PC\n");\r
cc68a136 109 OpPush32();\r
110 OpPushSr(1);\r
111 ot(" mov r0,r11\n");\r
112 ot(";@ Read IRQ Vector:\n");\r
113 MemHandler(0,2);\r
114 if(ints) {\r
115 ot(" tst r0,r0 ;@ uninitialized int vector?\n");\r
116 ot(" moveq r0,#0x3c\n");\r
117 ot(" moveq lr,pc\n");\r
118 ot(" ldreq pc,[r7,#0x70] ;@ Call read32(r0) handler\n");\r
119 }\r
120#if USE_CHECKPC_CALLBACK\r
121 ot(" add r0,r0,r10 ;@ r0 = Memory Base + New PC\n");\r
122 ot(" mov lr,pc\n");\r
123 ot(" ldr pc,[r7,#0x64] ;@ Call checkpc()\n");\r
124 ot(" mov r4,r0\n");\r
125#endif\r
126 ot("\n");\r
127\r
128 if(!ints) {\r
129 ot(" ldr r0,[r7,#0x44] ;@ Get SR high\n");\r
130 ot(" bic r0,r0,#0xd8 ;@ clear trace and unused flags\n");\r
131 ot(" orr r0,r0,#0x20 ;@ set supervisor mode\n");\r
132 ot(" strb r0,[r7,#0x44]\n");\r
133 }\r
134}\r
135\r
136// Trashes r0,r1\r
137void CheckInterrupt(int op)\r
138{\r
139 ot(";@ CheckInterrupt:\n");\r
66fdc0f0 140 ot(" ldr r1,[r7,#0x44] ;@ Get SR high T_S__III and irq level\n");\r
141 ot(" movs r0,r1,lsr #24 ;@ Get IRQ level\n"); // same as ldrb r0,[r7,#0x47]\r
cc68a136 142 ot(" beq NoInts%x\n",op);\r
143 ot(" cmp r0,#6 ;@ irq>6 ?\n");\r
cc68a136 144 ot(" andle r1,r1,#7 ;@ Get interrupt mask\n");\r
145 ot(" cmple r0,r1 ;@ irq<=6: Is irq<=mask ?\n");\r
7336a99a 146 ot(" blgt CycloneDoInterrupt\n");\r
cc68a136 147 ot("NoInts%x%s\n", op,ms?"":":");\r
148 ot("\n");\r
149}\r
150\r
cfb3dfa0 151void FlushPC(void)\r
152{\r
153#if MEMHANDLERS_NEED_PC\r
154 if (pc_dirty)\r
155 ot(" str r4,[r7,#0x40] ;@ Save PC\n");\r
156#endif\r
157 pc_dirty = 0;\r
158}\r
159\r
cc68a136 160static void PrintFramework()\r
161{\r
162 ot(";@ --------------------------- Framework --------------------------\n");\r
163 if (ms) ot("CycloneRun\n");\r
164 else ot("CycloneRun:\n");\r
165\r
166 ot(" stmdb sp!,{r4-r11,lr}\n");\r
167\r
168 ot(" mov r7,r0 ;@ r7 = Pointer to Cpu Context\n");\r
169 ot(" ;@ r0-3 = Temporary registers\n");\r
170 ot(" ldrb r9,[r7,#0x46] ;@ r9 = Flags (NZCV)\n");\r
7336a99a 171 ot(" ldr r6,=CycloneJumpTab ;@ r6 = Opcode Jump table\n");\r
cc68a136 172 ot(" ldr r5,[r7,#0x5c] ;@ r5 = Cycles\n");\r
173 ot(" ldr r4,[r7,#0x40] ;@ r4 = Current PC + Memory Base\n");\r
174 ot(" ;@ r8 = Current Opcode\n");\r
66fdc0f0 175 ot(" ldr r1,[r7,#0x44] ;@ Get SR high T_S__III and irq level\n");\r
cc68a136 176 ot(" mov r9,r9,lsl #28 ;@ r9 = Flags 0xf0000000, cpsr format\n");\r
177 ot(" ;@ r10 = Source value / Memory Base\n");\r
178 ot("\n");\r
179 ot(";@ CheckInterrupt:\n");\r
66fdc0f0 180 ot(" movs r0,r1,lsr #24 ;@ Get IRQ level\n"); // same as ldrb r0,[r7,#0x47]\r
cc68a136 181 ot(" beq NoInts0\n");\r
182 ot(" cmp r0,#6 ;@ irq>6 ?\n");\r
cc68a136 183 ot(" andle r1,r1,#7 ;@ Get interrupt mask\n");\r
184 ot(" cmple r0,r1 ;@ irq<=6: Is irq<=mask ?\n");\r
7336a99a 185 ot(" blgt CycloneDoInterrupt\n");\r
cc68a136 186 ot(";@ Check if interrupt used up all the cycles:\n");\r
187 ot(" subs r5,r5,#0\n");\r
188 ot(" blt CycloneEndNoBack\n");\r
189 ot("NoInts0%s\n", ms?"":":");\r
190 ot("\n");\r
191 ot(";@ Check if our processor is in stopped state and jump to opcode handler if not\n");\r
192 ot(" ldr r0,[r7,#0x58]\n");\r
193 ot(" ldrh r8,[r4],#2 ;@ Fetch first opcode\n");\r
194 ot(" tst r0,r0 ;@ stopped?\n");\r
195 ot(" bne CycloneStopped\n");\r
196 ot(" ldr pc,[r6,r8,asl #2] ;@ Jump to opcode handler\n");\r
197 ot("\n");\r
198 ot("\n");\r
199\r
200 ot(";@ We come back here after execution\n");\r
201 ot("CycloneEnd%s\n", ms?"":":");\r
202 ot(" sub r4,r4,#2\n");\r
203 ot("CycloneEndNoBack%s\n", ms?"":":");\r
a9a5a6e0 204#if (CYCLONE_FOR_GENESIS == 2)\r
7336a99a 205 ot(" ldr r1,[r7,#0x54]\n");\r
cc68a136 206 ot(" mov r9,r9,lsr #28\n");\r
7336a99a 207 ot(" tst r1,r1\n");\r
208 ot(" bxne r1 ;@ jump to alternative CycloneEnd\n");\r
209#else\r
210 ot(" mov r9,r9,lsr #28\n");\r
211#endif\r
cc68a136 212 ot(" str r4,[r7,#0x40] ;@ Save Current PC + Memory Base\n");\r
213 ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n");\r
214 ot(" strb r9,[r7,#0x46] ;@ Save Flags (NZCV)\n");\r
215 ot(" ldmia sp!,{r4-r11,pc}\n");\r
216 ot("\n");\r
217 ot("CycloneStopped%s\n", ms?"":":");\r
218 ot(" mov r5,#0\n");\r
219 ot(" str r5,[r7,#0x5C] ;@ eat all cycles\n");\r
220 ot(" ldmia sp!,{r4-r11,pc} ;@ we are stopped, do nothing!\n");\r
221 ot("\n");\r
222\r
223 ltorg();\r
224\r
225#if COMPRESS_JUMPTABLE\r
226 ot(";@ uncompress jump table\n");\r
227 if (ms) ot("CycloneInit\n");\r
228 else ot("CycloneInit:\n");\r
7336a99a 229 ot(" ldr r12,=CycloneJumpTab\n");\r
cc68a136 230 ot(" add r0,r12,#0xe000*4 ;@ ctrl code pointer\n");\r
231 ot(" ldr r1,[r0,#-4]\n");\r
232 ot(" tst r1,r1\n");\r
233 ot(" movne pc,lr ;@ already uncompressed\n");\r
a6785576 234 ot(" add r3,r12,#0xa000*4 ;@ handler table pointer, r12=dest\n");\r
cc68a136 235 ot("unc_loop%s\n", ms?"":":");\r
236 ot(" ldrh r1,[r0],#2\n");\r
237 ot(" and r2,r1,#0xf\n");\r
238 ot(" bic r1,r1,#0xf\n");\r
239 ot(" ldr r1,[r3,r1,lsr #2] ;@ r1=handler\n");\r
240 ot(" cmp r2,#0xf\n");\r
241 ot(" addeq r2,r2,#1 ;@ 0xf is really 0x10\n");\r
242 ot(" tst r2,r2\n");\r
243 ot(" ldreqh r2,[r0],#2 ;@ counter is in next word\n");\r
244 ot(" tst r2,r2\n");\r
245 ot(" beq unc_finish ;@ done decompressing\n");\r
246 ot(" tst r1,r1\n");\r
247 ot(" addeq r12,r12,r2,lsl #2 ;@ 0 handler means we should skip those bytes\n");\r
248 ot(" beq unc_loop\n");\r
249 ot("unc_loop_in%s\n", ms?"":":");\r
250 ot(" subs r2,r2,#1\n");\r
251 ot(" str r1,[r12],#4\n");\r
252 ot(" bgt unc_loop_in\n");\r
253 ot(" b unc_loop\n");\r
254 ot("unc_finish%s\n", ms?"":":");\r
7336a99a 255 ot(" ldr r12,=CycloneJumpTab\n");\r
cc68a136 256 ot(" ;@ set a-line and f-line handlers\n");\r
257 ot(" add r0,r12,#0xa000*4\n");\r
258 ot(" ldr r1,[r0,#4] ;@ a-line handler\n");\r
259 ot(" ldr r3,[r0,#8] ;@ f-line handler\n");\r
260 ot(" mov r2,#0x1000\n");\r
261 ot("unc_fill3%s\n", ms?"":":");\r
262 ot(" subs r2,r2,#1\n");\r
263 ot(" str r1,[r0],#4\n");\r
264 ot(" bgt unc_fill3\n");\r
265 ot(" add r0,r12,#0xf000*4\n");\r
266 ot(" mov r2,#0x1000\n");\r
267 ot("unc_fill4%s\n", ms?"":":");\r
268 ot(" subs r2,r2,#1\n");\r
269 ot(" str r3,[r0],#4\n");\r
270 ot(" bgt unc_fill4\n");\r
271 ot(" bx lr\n");\r
272 ltorg();\r
273 ot("\n");\r
274#else\r
275 ot(";@ do nothing\n");\r
276 if (ms) ot("CycloneInit\n");\r
277 else ot("CycloneInit:\n");\r
278 ot(" bx lr\n");\r
279 ot("\n");\r
280#endif\r
85a36a57 281 // 68k: XNZVC, ARM: NZCV\r
cc68a136 282 if (ms) ot("CycloneSetSr\n");\r
283 else ot("CycloneSetSr:\n");\r
284 ot(" mov r2,r1,lsr #8\n");\r
285 ot(" ldrb r3,[r0,#0x44] ;@ get SR high\n");\r
286 ot(" eor r3,r3,r2\n");\r
287 ot(" tst r3,#0x20\n");\r
288 ot(" and r2,r2,#0xa7 ;@ only nonzero bits\n");\r
289 ot(" strb r2,[r0,#0x44] ;@ set SR high\n");\r
290 ot(" bne setsr_noswap\n");\r
291 ot(" ldr r2,[r0,#0x3C] ;@ Get A7\n");\r
292 ot(" ldr r3,[r0,#0x48] ;@ Get OSP\n");\r
293 ot(" str r3,[r0,#0x3C]\n");\r
294 ot(" str r2,[r0,#0x48]\n");\r
295 ot("setsr_noswap%s\n",ms?"":":");\r
85a36a57 296 ot(" mov r2,r1,lsl #25\n");\r
297 ot(" str r2,[r0,#0x4c] ;@ the X flag\n");\r
cc68a136 298 ot(" bic r2,r1,#0xf3\n");\r
299 ot(" tst r1,#1\n");\r
300 ot(" orrne r2,r2,#2\n");\r
301 ot(" tst r1,#2\n");\r
302 ot(" orrne r2,r2,#1\n");\r
303 ot(" strb r2,[r0,#0x46] ;@ flags\n");\r
304 ot(" bx lr\n");\r
305 ot("\n");\r
306\r
307 if (ms) ot("CycloneGetSr\n");\r
308 else ot("CycloneGetSr:\n");\r
309 ot(" ldrb r1,[r0,#0x46] ;@ flags\n");\r
310 ot(" bic r2,r1,#0xf3\n");\r
311 ot(" tst r1,#1\n");\r
312 ot(" orrne r2,r2,#2\n");\r
313 ot(" tst r1,#2\n");\r
314 ot(" orrne r2,r2,#1\n");\r
85a36a57 315 ot(" ldr r1,[r0,#0x4c] ;@ the X flag\n");\r
316 ot(" tst r1,#0x20000000\n");\r
cc68a136 317 ot(" orrne r2,r2,#0x10\n");\r
318 ot(" ldrb r1,[r0,#0x44] ;@ the SR high\n");\r
319 ot(" orr r0,r2,r1,lsl #8\n");\r
320 ot(" bx lr\n");\r
321 ot("\n");\r
322\r
c008977e 323 if (ms) ot("CycloneSetRealTAS\n");\r
324 else ot("CycloneSetRealTAS:\n");\r
a9a5a6e0 325#if (CYCLONE_FOR_GENESIS == 2)\r
c008977e 326 ot(" ldr r12,=CycloneJumpTab\n");\r
327 ot(" tst r0,r0\n");\r
328 ot(" add r12,r12,#0x4a00*4\n");\r
329 ot(" add r12,r12,#0x00d0*4\n");\r
330 ot(" beq setrtas_off\n");\r
331 ChangeTAS(1);\r
332 ot(" bx lr\n");\r
333 ot("setrtas_off%s\n",ms?"":":");\r
334 ChangeTAS(0);\r
335 ot(" bx lr\n");\r
336 ltorg();\r
337 ot("\n");\r
338#else\r
339 ot(" bx lr\n");\r
340 ot("\n");\r
341#endif\r
342\r
cc68a136 343 ot(";@ DoInterrupt - r0=IRQ number\n");\r
7336a99a 344 ot("CycloneDoInterrupt%s\n", ms?"":":");\r
cc68a136 345 ot(" stmdb sp!,{lr} ;@ Push ARM return address\n");\r
346\r
347 ot(";@ Get IRQ Vector address:\n");\r
348 ot(" mov r0,r0,asl #2\n");\r
349 ot(" add r11,r0,#0x60\n");\r
350 PrintException(1);\r
351 \r
352 ot(" ldrb r0,[r7,#0x47] ;@ IRQ\n");\r
353 ot(" mov r2,#0\n");\r
354 ot(" orr r1,r0,#0x20 ;@ Supervisor mode + IRQ number\n");\r
355 ot(" strb r1,[r7,#0x44] ;@ Put SR high\n");\r
356\r
357 ot(";@ Clear stopped states:\n");\r
358 ot(" str r2,[r7,#0x58]\n");\r
359 ot(" sub r5,r5,#%d ;@ Subtract cycles\n",44);\r
360 ot("\n");\r
361#if USE_INT_ACK_CALLBACK\r
362#if INT_ACK_NEEDS_STUFF\r
363 ot(" str r4,[r7,#0x40] ;@ Save PC\n");\r
364 ot(" mov r1,r9,lsr #28\n");\r
365 ot(" strb r1,[r7,#0x46] ;@ Save Flags (NZCV)\n");\r
366 ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n");\r
367#endif\r
368 ot(" ldr r11,[r7,#0x8c] ;@ IrqCallback\n");\r
369 ot(" tst r11,r11\n");\r
370 ot(" movne lr,pc\n");\r
371 ot(" movne pc,r11 ;@ call IrqCallback if it is defined\n");\r
372#if INT_ACK_CHANGES_STUFF\r
373 ot(" ldr r5,[r7,#0x5c] ;@ Load Cycles\n");\r
374 ot(" ldrb r9,[r7,#0x46] ;@ r9 = Load Flags (NZCV)\n");\r
375 ot(" mov r9,r9,lsl #28\n");\r
376 ot(" ldr r4,[r7,#0x40] ;@ Load PC\n");\r
377#endif\r
378#else // not USE_INT_ACK_CALLBACK\r
379 ot(";@ Clear irq:\n");\r
380 ot(" strb r1,[r7,#0x47]\n");\r
381#endif\r
382 ot(" ldmia sp!,{pc} ;@ Return\n");\r
383 ot("\n");\r
384 \r
385 ot("Exception%s\n", ms?"":":");\r
cc68a136 386 ot(" stmdb sp!,{lr} ;@ Preserve ARM return address\n");\r
387 PrintException(0);\r
388 ot(" ldmia sp!,{pc} ;@ Return\n");\r
389 ot("\n");\r
390}\r
391\r
392// ---------------------------------------------------------------------------\r
393// Call Read(r0), Write(r0,r1) or Fetch(r0)\r
394// Trashes r0-r3,r12,lr\r
cfb3dfa0 395int MemHandler(int type,int size,int addrreg)\r
cc68a136 396{\r
397 int func=0;\r
398 func=0x68+type*0xc+(size<<2); // Find correct offset\r
399\r
cc68a136 400#if MEMHANDLERS_NEED_FLAGS\r
401 ot(" mov r3,r9,lsr #28\n");\r
402 ot(" strb r3,[r7,#0x46] ;@ Save Flags (NZCV)\n");\r
403#endif\r
cfb3dfa0 404 FlushPC();\r
cc68a136 405\r
a6785576 406#if (MEMHANDLERS_ADDR_MASK & 0xff000000)\r
cfb3dfa0 407 ot(" bic r0,r%i,#0x%08x\n", addrreg, MEMHANDLERS_ADDR_MASK & 0xff000000);\r
408 addrreg=0;\r
a6785576 409#endif\r
410#if (MEMHANDLERS_ADDR_MASK & 0x00ff0000)\r
cfb3dfa0 411 ot(" bic r0,r%i,#0x%08x\n", addrreg, MEMHANDLERS_ADDR_MASK & 0x00ff0000);\r
412 addrreg=0;\r
a6785576 413#endif\r
414#if (MEMHANDLERS_ADDR_MASK & 0x0000ff00)\r
cfb3dfa0 415 ot(" bic r0,r%i,#0x%08x\n", addrreg, MEMHANDLERS_ADDR_MASK & 0x0000ff00);\r
416 addrreg=0;\r
a6785576 417#endif\r
418#if (MEMHANDLERS_ADDR_MASK & 0x000000ff)\r
cfb3dfa0 419 ot(" bic r0,r%i,#0x%08x\n", addrreg, MEMHANDLERS_ADDR_MASK & 0x000000ff);\r
420 addrreg=0;\r
a6785576 421#endif\r
cfb3dfa0 422 if (addrreg != 0)\r
85a36a57 423 {\r
424 ot(" add lr,pc,#4\n"); // helps to prevent interlocks\r
cfb3dfa0 425 ot(" mov r0,r%i\n", addrreg);\r
85a36a57 426 }\r
427 else\r
428 ot(" mov lr,pc\n");\r
cc68a136 429 ot(" ldr pc,[r7,#0x%x] ;@ Call ",func);\r
430\r
431 // Document what we are calling:\r
432 if (type==0) ot("read");\r
433 if (type==1) ot("write");\r
434 if (type==2) ot("fetch");\r
435\r
436 if (type==1) ot("%d(r0,r1)",8<<size);\r
437 else ot("%d(r0)", 8<<size);\r
438 ot(" handler\n");\r
439\r
cc68a136 440#if MEMHANDLERS_CHANGE_FLAGS\r
441 ot(" ldrb r9,[r7,#0x46] ;@ r9 = Load Flags (NZCV)\n");\r
442 ot(" mov r9,r9,lsl #28\n");\r
443#endif\r
444#if MEMHANDLERS_CHANGE_PC\r
445 ot(" ldr r4,[r7,#0x40] ;@ Load PC\n");\r
446#endif\r
447\r
448 return 0;\r
449}\r
450\r
451static void PrintOpcodes()\r
452{\r
453 int op=0;\r
b637c56a 454\r
cc68a136 455 printf("Creating Opcodes: [");\r
456\r
457 ot(";@ ---------------------------- Opcodes ---------------------------\n");\r
458\r
459 // Emit null opcode:\r
460 ot("Op____%s ;@ Called if an opcode is not recognised\n", ms?"":":");\r
461 ot(" sub r4,r4,#2\n");\r
462#if USE_UNRECOGNIZED_CALLBACK\r
463 ot(" str r4,[r7,#0x40] ;@ Save PC\n");\r
464 ot(" mov r1,r9,lsr #28\n");\r
465 ot(" strb r1,[r7,#0x46] ;@ Save Flags (NZCV)\n");\r
466 ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n");\r
467 ot(" ldr r11,[r7,#0x94] ;@ UnrecognizedCallback\n");\r
468 ot(" tst r11,r11\n");\r
469 ot(" movne lr,pc\n");\r
470 ot(" movne pc,r11 ;@ call UnrecognizedCallback if it is defined\n");\r
471 ot(" ldrb r9,[r7,#0x46] ;@ r9 = Load Flags (NZCV)\n");\r
472 ot(" ldr r5,[r7,#0x5c] ;@ Load Cycles\n");\r
473 ot(" ldr r4,[r7,#0x40] ;@ Load PC\n");\r
474 ot(" mov r9,r9,lsl #28\n");\r
475 ot(" tst r0,r0\n");\r
476 ot(" moveq r0,#0x10\n");\r
477 ot(" bleq Exception\n");\r
478#else\r
479 ot(" mov r0,#0x10\n");\r
480 ot(" bl Exception\n");\r
481#endif\r
85a36a57 482 ot("\n");\r
cc68a136 483 Cycles=34;\r
484 OpEnd();\r
485\r
486 // Unrecognised a-line and f-line opcodes throw an exception:\r
487 ot("Op__al%s ;@ Unrecognised a-line opcode\n", ms?"":":");\r
488 ot(" sub r4,r4,#2\n");\r
489#if USE_AFLINE_CALLBACK\r
490 ot(" str r4,[r7,#0x40] ;@ Save PC\n");\r
491 ot(" mov r1,r9,lsr #28\n");\r
492 ot(" strb r1,[r7,#0x46] ;@ Save Flags (NZCV)\n");\r
493 ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n");\r
494 ot(" ldr r11,[r7,#0x94] ;@ UnrecognizedCallback\n");\r
495 ot(" tst r11,r11\n");\r
496 ot(" movne lr,pc\n");\r
497 ot(" movne pc,r11 ;@ call UnrecognizedCallback if it is defined\n");\r
498 ot(" ldrb r9,[r7,#0x46] ;@ r9 = Load Flags (NZCV)\n");\r
499 ot(" ldr r5,[r7,#0x5c] ;@ Load Cycles\n");\r
500 ot(" ldr r4,[r7,#0x40] ;@ Load PC\n");\r
501 ot(" mov r9,r9,lsl #28\n");\r
502 ot(" tst r0,r0\n");\r
503 ot(" moveq r0,#0x28\n");\r
504 ot(" bleq Exception\n");\r
505#else\r
506 ot(" mov r0,#0x28\n");\r
507 ot(" bl Exception\n");\r
508#endif\r
85a36a57 509 ot("\n");\r
cc68a136 510 Cycles=4;\r
511 OpEnd();\r
512\r
513 ot("Op__fl%s ;@ Unrecognised f-line opcode\n", ms?"":":");\r
514 ot(" sub r4,r4,#2\n");\r
515#if USE_AFLINE_CALLBACK\r
516 ot(" str r4,[r7,#0x40] ;@ Save PC\n");\r
517 ot(" mov r1,r9,lsr #28\n");\r
518 ot(" strb r1,[r7,#0x46] ;@ Save Flags (NZCV)\n");\r
519 ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n");\r
520 ot(" ldr r11,[r7,#0x94] ;@ UnrecognizedCallback\n");\r
521 ot(" tst r11,r11\n");\r
522 ot(" movne lr,pc\n");\r
523 ot(" movne pc,r11 ;@ call UnrecognizedCallback if it is defined\n");\r
524 ot(" ldrb r9,[r7,#0x46] ;@ r9 = Load Flags (NZCV)\n");\r
525 ot(" ldr r5,[r7,#0x5c] ;@ Load Cycles\n");\r
526 ot(" ldr r4,[r7,#0x40] ;@ Load PC\n");\r
527 ot(" mov r9,r9,lsl #28\n");\r
528 ot(" tst r0,r0\n");\r
529 ot(" moveq r0,#0x2c\n");\r
530 ot(" bleq Exception\n");\r
531#else\r
532 ot(" mov r0,#0x2c\n");\r
533 ot(" bl Exception\n");\r
534#endif\r
85a36a57 535 ot("\n");\r
cc68a136 536 Cycles=4;\r
537 OpEnd();\r
538\r
539\r
540 for (op=0;op<0x10000;op++)\r
541 {\r
542 if ((op&0xfff)==0) { printf("%x",op>>12); fflush(stdout); } // Update progress\r
543\r
544 OpAny(op);\r
545 }\r
546\r
547 ot("\n");\r
548\r
549 printf("]\n");\r
550}\r
551\r
552// helper\r
553static void ott(const char *str, int par, const char *nl, int nlp, int counter, int size)\r
554{\r
555 switch(size) {\r
556 case 0: if((counter&7)==0) ot(ms?" dcb ":" .byte "); break;\r
557 case 1: if((counter&7)==0) ot(ms?" dcw ":" .hword "); break;\r
558 case 2: if((counter&7)==0) ot(ms?" dcd ":" .long "); break;\r
559 }\r
560 ot(str, par);\r
561 if((counter&7)==7) ot(nl,nlp); else ot(",");\r
562}\r
563\r
564static void PrintJumpTable()\r
565{\r
566 int i=0,op=0,len=0;\r
567\r
568 ot(";@ -------------------------- Jump Table --------------------------\n");\r
569\r
c008977e 570 // space for decompressed table\r
571 ot(ms?" area |.data|, data\n":" .data\n .align 4\n\n");\r
572\r
cc68a136 573#if COMPRESS_JUMPTABLE\r
574 int handlers=0,reps=0,*indexes,ip,u,out;\r
575 // use some weird compression on the jump table\r
a6785576 576 indexes=(int *)malloc(0x10000*4);\r
577 if(!indexes) { printf("ERROR: out of memory\n"); exit(1); }\r
578 len=0x10000;\r
cc68a136 579\r
a6785576 580 ot("CycloneJumpTab%s\n", ms?"":":");\r
581 if(ms) {\r
582 for(i = 0; i < 0xa000/8; i++)\r
583 ot(" dcd 0,0,0,0,0,0,0,0\n");\r
584 } else\r
585 ot(" .rept 0x%x\n .long 0,0,0,0,0,0,0,0\n .endr\n", 0xa000/8);\r
cc68a136 586\r
587 // hanlers live in "a-line" part of the table\r
a6785576 588 // first output nop,a-line,f-line handlers\r
589 ot(ms?" dcd Op____,Op__al,Op__fl,":" .long Op____,Op__al,Op__fl,");\r
590 handlers=3;\r
cc68a136 591\r
a6785576 592 for(i=0;i<len;i++)\r
cc68a136 593 {\r
594 op=CyJump[i];\r
595\r
a6785576 596 for(u=i-1; u>=0; u--) if(op == CyJump[u]) break; // already done with this op?\r
597 if(u==-1 && op >= 0) {\r
598 ott("Op%.4x",op," ;@ %.4x\n",i,handlers,2);\r
599 indexes[op] = handlers;\r
600 handlers++;\r
cc68a136 601 }\r
a6785576 602 }\r
603 if(handlers&7) {\r
604 fseek(AsmFile, -1, SEEK_CUR); // remove last comma\r
605 for(i = 8-(handlers&7); i > 0; i--)\r
606 ot(",000000");\r
607 ot("\n");\r
608 }\r
609 if(ms) {\r
610 for(i = (0x4000-handlers)/8; i > 0; i--)\r
611 ot(" dcd 0,0,0,0,0,0,0,0\n");\r
612 } else {\r
613 ot(ms?"":" .rept 0x%x\n .long 0,0,0,0,0,0,0,0\n .endr\n", (0x4000-handlers)/8);\r
614 }\r
cc68a136 615 printf("total distinct hanlers: %i\n",handlers);\r
a6785576 616 // output data\r
617 for(i=0,ip=0; i < 0xf000; i++, ip++) {\r
cc68a136 618 op=CyJump[i];\r
a6785576 619 if(op == -2) {\r
620 // it must skip a-line area, because we keep our data there\r
621 ott("0x%.4x", handlers<<4, "\n",0,ip++,1);\r
622 ott("0x%.4x", 0x1000, "\n",0,ip,1);\r
623 i+=0xfff;\r
624 continue;\r
625 }\r
626 for(reps=1; i < 0xf000; i++, reps++) if(op != CyJump[i+1]) break;\r
627 if(op>=0) out=indexes[op]<<4; else out=0; // unrecognised\r
628 if(reps <= 0xe || reps==0x10) {\r
629 if(reps!=0x10) out|=reps; else out|=0xf; // 0xf means 0x10 (0xf appeared to be unused anyway)\r
630 ott("0x%.4x", out, "\n",0,ip,1);\r
cc68a136 631 } else {\r
a6785576 632 ott("0x%.4x", out, "\n",0,ip++,1);\r
633 ott("0x%.4x", reps,"\n",0,ip,1);\r
634 }\r
cc68a136 635 }\r
a6785576 636 if(ip&1) ott("0x%.4x", 0, "\n",0,ip++,1);\r
637 if(ip&7) fseek(AsmFile, -1, SEEK_CUR); // remove last comma\r
a6785576 638 if(ip&7) {\r
639 for(i = 8-(ip&7); i > 0; i--)\r
640 ot(",0x0000");\r
a6785576 641 }\r
547045e3 642 ot("\n");\r
a6785576 643 if(ms) {\r
644 for(i = (0x2000-ip/2)/8+1; i > 0; i--)\r
645 ot(" dcd 0,0,0,0,0,0,0,0\n");\r
646 } else {\r
647 ot(" .rept 0x%x\n .long 0,0,0,0,0,0,0,0\n .endr\n", (0x2000-ip/2)/8+1);\r
648 }\r
649 ot("\n");\r
650 free(indexes);\r
cc68a136 651#else\r
a6785576 652 ot("CycloneJumpTab%s\n", ms?"":":");\r
cc68a136 653 len=0xfffe; // Hmmm, armasm 2.50.8684 messes up with a 0x10000 long jump table\r
654 // notaz: same thing with GNU as 2.9-psion-98r2 (reloc overflow)\r
655 // this is due to COFF objects using only 2 bytes for reloc count\r
656\r
657 for (i=0;i<len;i++)\r
658 {\r
659 op=CyJump[i];\r
660 \r
661 if(op>=0) ott("Op%.4x",op," ;@ %.4x\n",i-7,i,2);\r
662 else if(op==-2) ott("Op__al",0, " ;@ %.4x\n",i-7,i,2);\r
663 else if(op==-3) ott("Op__fl",0, " ;@ %.4x\n",i-7,i,2);\r
664 else ott("Op____",0, " ;@ %.4x\n",i-7,i,2);\r
665 }\r
a6785576 666 if(i&7) fseek(AsmFile, -1, SEEK_CUR); // remove last comma\r
cc68a136 667\r
668 ot("\n");\r
669 ot(";@ notaz: we don't want to crash if we run into those 2 missing opcodes\n");\r
670 ot(";@ so we leave this pattern to patch it later\n");\r
671 ot("%s 0x78563412\n", ms?" dcd":" .long");\r
672 ot("%s 0x56341290\n", ms?" dcd":" .long");\r
673#endif\r
674}\r
675\r
676static int CycloneMake()\r
677{\r
678 int i;\r
679 char *name="Cyclone.s";\r
680 \r
681 // Open the assembly file\r
682 if (ms) name="Cyclone.asm";\r
683 AsmFile=fopen(name,"wt"); if (AsmFile==NULL) return 1;\r
684 \r
685 printf("Making %s...\n",name);\r
686\r
687 ot("\n;@ Dave's Cyclone 68000 Emulator v%x.%.3x - Assembler Output\n\n",CycloneVer>>12,CycloneVer&0xfff);\r
688\r
689 ot(";@ (c) Copyright 2003 Dave, All rights reserved.\n");\r
547045e3 690 ot(";@ some code (c) Copyright 2005-2007 notaz, All rights reserved.\n");\r
cc68a136 691 ot(";@ Cyclone 68000 is free for non-commercial use.\n\n");\r
692 ot(";@ For commercial use, separate licencing terms must be obtained.\n\n");\r
693\r
694 CyJump=(int *)malloc(0x40000); if (CyJump==NULL) return 1;\r
695 memset(CyJump,0xff,0x40000); // Init to -1\r
696 for(i=0xa000; i<0xb000; i++) CyJump[i] = -2; // a-line emulation\r
697 for(i=0xf000; i<0x10000; i++) CyJump[i] = -3; // f-line emulation\r
698\r
699 if (ms)\r
700 {\r
701 ot(" area |.text|, code\n");\r
702 ot(" export CycloneInit\n");\r
703 ot(" export CycloneRun\n");\r
704 ot(" export CycloneSetSr\n");\r
705 ot(" export CycloneGetSr\n");\r
c008977e 706 ot(" export CycloneSetRealTAS\n");\r
cc68a136 707 ot(" export CycloneVer\n");\r
708 ot("\n");\r
709 ot("CycloneVer dcd 0x%.4x\n",CycloneVer);\r
710 }\r
711 else\r
712 {\r
713 ot(" .global CycloneInit\n");\r
714 ot(" .global CycloneRun\n");\r
715 ot(" .global CycloneSetSr\n");\r
716 ot(" .global CycloneGetSr\n");\r
717 ot(" .global CycloneVer\n");\r
a9a5a6e0 718#if (CYCLONE_FOR_GENESIS == 2)\r
2c559c66 719 ot(" .global CycloneSetRealTAS\n");\r
7336a99a 720 ot(" .global CycloneDoInterrupt\n");\r
721 ot(" .global CycloneJumpTab\n");\r
722#endif\r
cc68a136 723 ot("CycloneVer: .long 0x%.4x\n",CycloneVer);\r
724 }\r
725 ot("\n");\r
726\r
727 PrintFramework();\r
b637c56a 728 arm_op_count = 0;\r
cc68a136 729 PrintOpcodes();\r
b637c56a 730 printf("~%i ARM instructions used for opcode handlers\n", arm_op_count);\r
cc68a136 731 PrintJumpTable();\r
732\r
733 if (ms) ot(" END\n");\r
734\r
7336a99a 735 ot("\n\n;@ vim:filetype=armasm\n");\r
736\r
cc68a136 737 fclose(AsmFile); AsmFile=NULL;\r
738\r
739#if 0\r
740 printf("Assembling...\n");\r
741 // Assemble the file\r
742 if (ms) system("armasm Cyclone.asm");\r
743 else system("as -o Cyclone.o Cyclone.s");\r
744 printf("Done!\n\n");\r
745#endif\r
746\r
747 free(CyJump);\r
748 return 0;\r
749}\r
750\r
751int main()\r
752{\r
753 printf("\n Dave's Cyclone 68000 Emulator v%x.%.3x - Core Creator\n\n",CycloneVer>>12,CycloneVer&0xfff);\r
754\r
755 // Make GAS or ARMASM version\r
756 CycloneMake();\r
757 return 0;\r
758}\r
759\r
fast MegaDrive/MegaCD/32X emulator