src/gba/gba.c (view raw)
1#include "gba.h"
2
3#include "gba-bios.h"
4#include "gba-io.h"
5#include "gba-rr.h"
6#include "gba-sio.h"
7#include "gba-thread.h"
8
9#include "util/memory.h"
10#include "util/patch.h"
11#include "util/vfs.h"
12
13const uint32_t GBA_ARM7TDMI_FREQUENCY = 0x1000000;
14const uint32_t GBA_COMPONENT_MAGIC = 0x1000000;
15
16static const uint64_t GBA_ROM_MAGIC = 0x21A29A6951AEFF24;
17
18enum {
19 SP_BASE_SYSTEM = 0x03FFFF00,
20 SP_BASE_IRQ = 0x03FFFFA0,
21 SP_BASE_SUPERVISOR = 0x03FFFFE0
22};
23
24struct GBACartridgeOverride {
25 const char id[4];
26 enum SavedataType type;
27 int gpio;
28};
29
30static const struct GBACartridgeOverride _overrides[] = {
31 // Boktai: The Sun is in Your Hand
32 { "U3IE", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR },
33 { "U3IP", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR },
34
35 // Boktai 2: Solar Boy Django
36 { "U32E", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR },
37 { "U32P", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR },
38
39 // Drill Dozer
40 { "V49J", SAVEDATA_SRAM, GPIO_RUMBLE },
41 { "V49E", SAVEDATA_SRAM, GPIO_RUMBLE },
42
43 // Pokemon Ruby
44 { "AXVJ", SAVEDATA_FLASH1M, GPIO_RTC },
45 { "AXVE", SAVEDATA_FLASH1M, GPIO_RTC },
46 { "AXVP", SAVEDATA_FLASH1M, GPIO_RTC },
47 { "AXVI", SAVEDATA_FLASH1M, GPIO_RTC },
48 { "AXVS", SAVEDATA_FLASH1M, GPIO_RTC },
49 { "AXVD", SAVEDATA_FLASH1M, GPIO_RTC },
50 { "AXVF", SAVEDATA_FLASH1M, GPIO_RTC },
51
52 // Pokemon Sapphire
53 { "AXPJ", SAVEDATA_FLASH1M, GPIO_RTC },
54 { "AXPE", SAVEDATA_FLASH1M, GPIO_RTC },
55 { "AXPP", SAVEDATA_FLASH1M, GPIO_RTC },
56 { "AXPI", SAVEDATA_FLASH1M, GPIO_RTC },
57 { "AXPS", SAVEDATA_FLASH1M, GPIO_RTC },
58 { "AXPD", SAVEDATA_FLASH1M, GPIO_RTC },
59 { "AXPF", SAVEDATA_FLASH1M, GPIO_RTC },
60
61 // Pokemon Emerald
62 { "BPEJ", SAVEDATA_FLASH1M, GPIO_RTC },
63 { "BPEE", SAVEDATA_FLASH1M, GPIO_RTC },
64 { "BPEP", SAVEDATA_FLASH1M, GPIO_RTC },
65 { "BPEI", SAVEDATA_FLASH1M, GPIO_RTC },
66 { "BPES", SAVEDATA_FLASH1M, GPIO_RTC },
67 { "BPED", SAVEDATA_FLASH1M, GPIO_RTC },
68 { "BPEF", SAVEDATA_FLASH1M, GPIO_RTC },
69
70 // Pokemon FireRed
71 { "BPRJ", SAVEDATA_FLASH1M, GPIO_NONE },
72 { "BPRE", SAVEDATA_FLASH1M, GPIO_NONE },
73 { "BPRP", SAVEDATA_FLASH1M, GPIO_NONE },
74
75 // Pokemon LeafGreen
76 { "BPGJ", SAVEDATA_FLASH1M, GPIO_NONE },
77 { "BPGE", SAVEDATA_FLASH1M, GPIO_NONE },
78 { "BPGP", SAVEDATA_FLASH1M, GPIO_NONE },
79
80 // RockMan EXE 4.5 - Real Operation
81 { "BR4J", SAVEDATA_FLASH512, GPIO_RTC },
82
83 // Super Mario Advance 4
84 { "AX4J", SAVEDATA_FLASH1M, GPIO_NONE },
85 { "AX4E", SAVEDATA_FLASH1M, GPIO_NONE },
86 { "AX4P", SAVEDATA_FLASH1M, GPIO_NONE },
87
88 // Wario Ware Twisted
89 { "RWZJ", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO },
90 { "RWZE", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO },
91 { "RWZP", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO },
92
93 { { 0, 0, 0, 0 }, 0, 0 }
94};
95
96static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component);
97static void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh);
98static void GBAProcessEvents(struct ARMCore* cpu);
99static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles);
100static void GBAHitStub(struct ARMCore* cpu, uint32_t opcode);
101static void GBAIllegal(struct ARMCore* cpu, uint32_t opcode);
102
103static void _checkOverrides(struct GBA* gba, uint32_t code);
104
105void GBACreate(struct GBA* gba) {
106 gba->d.id = GBA_COMPONENT_MAGIC;
107 gba->d.init = GBAInit;
108 gba->d.deinit = 0;
109}
110
111static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component) {
112 struct GBA* gba = (struct GBA*) component;
113 gba->cpu = cpu;
114 gba->debugger = 0;
115
116 GBAInterruptHandlerInit(&cpu->irqh);
117 GBAMemoryInit(gba);
118
119 gba->video.p = gba;
120 GBAVideoInit(&gba->video);
121
122 gba->audio.p = gba;
123 GBAAudioInit(&gba->audio);
124
125 GBAIOInit(gba);
126
127 gba->sio.p = gba;
128 GBASIOInit(&gba->sio);
129
130 gba->timersEnabled = 0;
131 memset(gba->timers, 0, sizeof(gba->timers));
132
133 gba->springIRQ = 0;
134 gba->keySource = 0;
135 gba->rotationSource = 0;
136 gba->rumble = 0;
137
138 gba->romVf = 0;
139 gba->biosVf = 0;
140
141 gba->logLevel = GBA_LOG_INFO | GBA_LOG_WARN | GBA_LOG_ERROR | GBA_LOG_FATAL;
142
143 gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
144}
145
146void GBADestroy(struct GBA* gba) {
147 if (gba->pristineRom == gba->memory.rom) {
148 gba->memory.rom = 0;
149 }
150
151 if (gba->romVf) {
152 gba->romVf->unmap(gba->romVf, gba->pristineRom, gba->pristineRomSize);
153 }
154
155 if (gba->biosVf) {
156 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
157 }
158
159 GBAMemoryDeinit(gba);
160 GBAVideoDeinit(&gba->video);
161 GBAAudioDeinit(&gba->audio);
162 GBARRContextDestroy(gba);
163}
164
165void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
166 irqh->reset = GBAReset;
167 irqh->processEvents = GBAProcessEvents;
168 irqh->swi16 = GBASwi16;
169 irqh->swi32 = GBASwi32;
170 irqh->hitIllegal = GBAIllegal;
171 irqh->readCPSR = GBATestIRQ;
172 irqh->hitStub = GBAHitStub;
173}
174
175void GBAReset(struct ARMCore* cpu) {
176 ARMSetPrivilegeMode(cpu, MODE_IRQ);
177 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
178 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
179 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
180 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
181 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
182}
183
184static void GBAProcessEvents(struct ARMCore* cpu) {
185 do {
186 struct GBA* gba = (struct GBA*) cpu->master;
187 int32_t cycles = cpu->cycles;
188 int32_t nextEvent = INT_MAX;
189 int32_t testEvent;
190
191 if (gba->springIRQ) {
192 ARMRaiseIRQ(cpu);
193 gba->springIRQ = 0;
194 }
195
196 testEvent = GBAVideoProcessEvents(&gba->video, cycles);
197 if (testEvent < nextEvent) {
198 nextEvent = testEvent;
199 }
200
201 testEvent = GBAAudioProcessEvents(&gba->audio, cycles);
202 if (testEvent < nextEvent) {
203 nextEvent = testEvent;
204 }
205
206 testEvent = GBATimersProcessEvents(gba, cycles);
207 if (testEvent < nextEvent) {
208 nextEvent = testEvent;
209 }
210
211 testEvent = GBAMemoryRunDMAs(gba, cycles);
212 if (testEvent < nextEvent) {
213 nextEvent = testEvent;
214 }
215
216 testEvent = GBASIOProcessEvents(&gba->sio, cycles);
217 if (testEvent < nextEvent) {
218 nextEvent = testEvent;
219 }
220
221 cpu->cycles -= cycles;
222 cpu->nextEvent = nextEvent;
223
224 if (cpu->halted) {
225 cpu->cycles = cpu->nextEvent;
226 }
227 } while (cpu->cycles >= cpu->nextEvent);
228}
229
230static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
231 int32_t nextEvent = INT_MAX;
232 if (gba->timersEnabled) {
233 struct GBATimer* timer;
234 struct GBATimer* nextTimer;
235
236 timer = &gba->timers[0];
237 if (timer->enable) {
238 timer->nextEvent -= cycles;
239 timer->lastEvent -= cycles;
240 if (timer->nextEvent <= 0) {
241 timer->lastEvent = timer->nextEvent;
242 timer->nextEvent += timer->overflowInterval;
243 gba->memory.io[REG_TM0CNT_LO >> 1] = timer->reload;
244 timer->oldReload = timer->reload;
245
246 if (timer->doIrq) {
247 GBARaiseIRQ(gba, IRQ_TIMER0);
248 }
249
250 if (gba->audio.enable) {
251 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
252 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
253 }
254
255 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
256 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
257 }
258 }
259
260 nextTimer = &gba->timers[1];
261 if (nextTimer->countUp) {
262 ++gba->memory.io[REG_TM1CNT_LO >> 1];
263 if (!gba->memory.io[REG_TM1CNT_LO >> 1]) {
264 nextTimer->nextEvent = 0;
265 }
266 }
267 }
268 nextEvent = timer->nextEvent;
269 }
270
271 timer = &gba->timers[1];
272 if (timer->enable) {
273 timer->nextEvent -= cycles;
274 timer->lastEvent -= cycles;
275 if (timer->nextEvent <= 0) {
276 timer->lastEvent = timer->nextEvent;
277 timer->nextEvent += timer->overflowInterval;
278 gba->memory.io[REG_TM1CNT_LO >> 1] = timer->reload;
279 timer->oldReload = timer->reload;
280
281 if (timer->doIrq) {
282 GBARaiseIRQ(gba, IRQ_TIMER1);
283 }
284
285 if (gba->audio.enable) {
286 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
287 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
288 }
289
290 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
291 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
292 }
293 }
294
295 if (timer->countUp) {
296 timer->nextEvent = INT_MAX;
297 }
298
299 nextTimer = &gba->timers[2];
300 if (nextTimer->countUp) {
301 ++gba->memory.io[REG_TM2CNT_LO >> 1];
302 if (!gba->memory.io[REG_TM2CNT_LO >> 1]) {
303 nextTimer->nextEvent = 0;
304 }
305 }
306 }
307 if (timer->nextEvent < nextEvent) {
308 nextEvent = timer->nextEvent;
309 }
310 }
311
312 timer = &gba->timers[2];
313 if (timer->enable) {
314 timer->nextEvent -= cycles;
315 timer->lastEvent -= cycles;
316 nextEvent = timer->nextEvent;
317 if (timer->nextEvent <= 0) {
318 timer->lastEvent = timer->nextEvent;
319 timer->nextEvent += timer->overflowInterval;
320 gba->memory.io[REG_TM2CNT_LO >> 1] = timer->reload;
321 timer->oldReload = timer->reload;
322
323 if (timer->doIrq) {
324 GBARaiseIRQ(gba, IRQ_TIMER2);
325 }
326
327 if (timer->countUp) {
328 timer->nextEvent = INT_MAX;
329 }
330
331 nextTimer = &gba->timers[3];
332 if (nextTimer->countUp) {
333 ++gba->memory.io[REG_TM3CNT_LO >> 1];
334 if (!gba->memory.io[REG_TM3CNT_LO >> 1]) {
335 nextTimer->nextEvent = 0;
336 }
337 }
338 }
339 if (timer->nextEvent < nextEvent) {
340 nextEvent = timer->nextEvent;
341 }
342 }
343
344 timer = &gba->timers[3];
345 if (timer->enable) {
346 timer->nextEvent -= cycles;
347 timer->lastEvent -= cycles;
348 nextEvent = timer->nextEvent;
349 if (timer->nextEvent <= 0) {
350 timer->lastEvent = timer->nextEvent;
351 timer->nextEvent += timer->overflowInterval;
352 gba->memory.io[REG_TM3CNT_LO >> 1] = timer->reload;
353 timer->oldReload = timer->reload;
354
355 if (timer->doIrq) {
356 GBARaiseIRQ(gba, IRQ_TIMER3);
357 }
358
359 if (timer->countUp) {
360 timer->nextEvent = INT_MAX;
361 }
362 }
363 if (timer->nextEvent < nextEvent) {
364 nextEvent = timer->nextEvent;
365 }
366 }
367 }
368 return nextEvent;
369}
370
371void GBAAttachDebugger(struct GBA* gba, struct ARMDebugger* debugger) {
372 gba->debugger = debugger;
373}
374
375void GBADetachDebugger(struct GBA* gba) {
376 gba->debugger = 0;
377}
378
379void GBALoadROM(struct GBA* gba, struct VFile* vf, struct VFile* sav, const char* fname) {
380 gba->romVf = vf;
381 gba->pristineRomSize = vf->seek(vf, 0, SEEK_END);
382 vf->seek(vf, 0, SEEK_SET);
383 gba->pristineRom = vf->map(vf, SIZE_CART0, MEMORY_READ);
384 gba->memory.rom = gba->pristineRom;
385 gba->activeFile = fname;
386 gba->memory.romSize = gba->pristineRomSize;
387 GBASavedataInit(&gba->memory.savedata, sav);
388 GBAGPIOInit(&gba->memory.gpio, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
389 _checkOverrides(gba, ((struct GBACartridge*) gba->memory.rom)->id);
390 // TODO: error check
391}
392
393void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
394 gba->biosVf = vf;
395 gba->memory.bios = vf->map(vf, SIZE_BIOS, MEMORY_READ);
396 gba->memory.fullBios = 1;
397 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
398 GBALog(gba, GBA_LOG_DEBUG, "BIOS Checksum: 0x%X", checksum);
399 if (checksum == GBA_BIOS_CHECKSUM) {
400 GBALog(gba, GBA_LOG_INFO, "Official GBA BIOS detected");
401 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
402 GBALog(gba, GBA_LOG_INFO, "Official GBA (DS) BIOS detected");
403 } else {
404 GBALog(gba, GBA_LOG_WARN, "BIOS checksum incorrect");
405 }
406 gba->biosChecksum = checksum;
407 if ((gba->cpu->gprs[ARM_PC] >> BASE_OFFSET) == BASE_BIOS) {
408 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
409 }
410 // TODO: error check
411}
412
413void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
414 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
415 if (!patchedSize) {
416 return;
417 }
418 gba->memory.rom = anonymousMemoryMap(patchedSize);
419 memcpy(gba->memory.rom, gba->pristineRom, gba->memory.romSize > patchedSize ? patchedSize : gba->memory.romSize);
420 if (!patch->applyPatch(patch, gba->memory.rom, patchedSize)) {
421 mappedMemoryFree(gba->memory.rom, patchedSize);
422 gba->memory.rom = gba->pristineRom;
423 return;
424 }
425 gba->memory.romSize = patchedSize;
426}
427
428void GBATimerUpdateRegister(struct GBA* gba, int timer) {
429 struct GBATimer* currentTimer = &gba->timers[timer];
430 if (currentTimer->enable && !currentTimer->countUp) {
431 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> currentTimer->prescaleBits);
432 }
433}
434
435void GBATimerWriteTMCNT_LO(struct GBA* gba, int timer, uint16_t reload) {
436 gba->timers[timer].reload = reload;
437}
438
439void GBATimerWriteTMCNT_HI(struct GBA* gba, int timer, uint16_t control) {
440 struct GBATimer* currentTimer = &gba->timers[timer];
441 GBATimerUpdateRegister(gba, timer);
442
443 int oldPrescale = currentTimer->prescaleBits;
444 switch (control & 0x0003) {
445 case 0x0000:
446 currentTimer->prescaleBits = 0;
447 break;
448 case 0x0001:
449 currentTimer->prescaleBits = 6;
450 break;
451 case 0x0002:
452 currentTimer->prescaleBits = 8;
453 break;
454 case 0x0003:
455 currentTimer->prescaleBits = 10;
456 break;
457 }
458 currentTimer->countUp = !!(control & 0x0004);
459 currentTimer->doIrq = !!(control & 0x0040);
460 currentTimer->overflowInterval = (0x10000 - currentTimer->reload) << currentTimer->prescaleBits;
461 int wasEnabled = currentTimer->enable;
462 currentTimer->enable = !!(control & 0x0080);
463 if (!wasEnabled && currentTimer->enable) {
464 if (!currentTimer->countUp) {
465 currentTimer->nextEvent = gba->cpu->cycles + currentTimer->overflowInterval;
466 } else {
467 currentTimer->nextEvent = INT_MAX;
468 }
469 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->reload;
470 currentTimer->oldReload = currentTimer->reload;
471 currentTimer->lastEvent = 0;
472 gba->timersEnabled |= 1 << timer;
473 } else if (wasEnabled && !currentTimer->enable) {
474 if (!currentTimer->countUp) {
475 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> oldPrescale);
476 }
477 gba->timersEnabled &= ~(1 << timer);
478 } else if (currentTimer->prescaleBits != oldPrescale && !currentTimer->countUp) {
479 // FIXME: this might be before present
480 currentTimer->nextEvent = currentTimer->lastEvent + currentTimer->overflowInterval;
481 }
482
483 if (currentTimer->nextEvent < gba->cpu->nextEvent) {
484 gba->cpu->nextEvent = currentTimer->nextEvent;
485 }
486};
487
488void GBAWriteIE(struct GBA* gba, uint16_t value) {
489 if (value & (1 << IRQ_KEYPAD)) {
490 GBALog(gba, GBA_LOG_STUB, "Keypad interrupts not implemented");
491 }
492
493 if (value & (1 << IRQ_GAMEPAK)) {
494 GBALog(gba, GBA_LOG_STUB, "Gamepak interrupts not implemented");
495 }
496
497 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
498 ARMRaiseIRQ(gba->cpu);
499 }
500}
501
502void GBAWriteIME(struct GBA* gba, uint16_t value) {
503 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
504 ARMRaiseIRQ(gba->cpu);
505 }
506}
507
508void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
509 gba->memory.io[REG_IF >> 1] |= 1 << irq;
510 gba->cpu->halted = 0;
511
512 if (gba->memory.io[REG_IME >> 1] && (gba->memory.io[REG_IE >> 1] & 1 << irq)) {
513 ARMRaiseIRQ(gba->cpu);
514 }
515}
516
517void GBATestIRQ(struct ARMCore* cpu) {
518 struct GBA* gba = (struct GBA*) cpu->master;
519 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
520 gba->springIRQ = 1;
521 gba->cpu->nextEvent = 0;
522 }
523}
524
525void GBAHalt(struct GBA* gba) {
526 gba->cpu->nextEvent = 0;
527 gba->cpu->halted = 1;
528}
529
530static void _GBAVLog(struct GBA* gba, enum GBALogLevel level, const char* format, va_list args) {
531 if (!gba) {
532 struct GBAThread* threadContext = GBAThreadGetContext();
533 if (threadContext) {
534 gba = threadContext->gba;
535 }
536 }
537
538 if (gba && gba->logHandler) {
539 gba->logHandler(gba, level, format, args);
540 return;
541 }
542
543 if (gba && !(level & gba->logLevel) && level != GBA_LOG_FATAL) {
544 return;
545 }
546
547 vprintf(format, args);
548 printf("\n");
549
550 if (level == GBA_LOG_FATAL) {
551 abort();
552 }
553}
554
555void GBALog(struct GBA* gba, enum GBALogLevel level, const char* format, ...) {
556 va_list args;
557 va_start(args, format);
558 _GBAVLog(gba, level, format, args);
559 va_end(args);
560}
561
562void GBADebuggerLogShim(struct ARMDebugger* debugger, enum DebuggerLogLevel level, const char* format, ...) {
563 struct GBA* gba = 0;
564 if (debugger->cpu) {
565 gba = (struct GBA*) debugger->cpu->master;
566 }
567
568 enum GBALogLevel gbaLevel;
569 switch (level) {
570 case DEBUGGER_LOG_DEBUG:
571 gbaLevel = GBA_LOG_DEBUG;
572 break;
573 case DEBUGGER_LOG_INFO:
574 gbaLevel = GBA_LOG_INFO;
575 break;
576 case DEBUGGER_LOG_WARN:
577 gbaLevel = GBA_LOG_WARN;
578 break;
579 case DEBUGGER_LOG_ERROR:
580 gbaLevel = GBA_LOG_ERROR;
581 break;
582 }
583 va_list args;
584 va_start(args, format);
585 _GBAVLog(gba, gbaLevel, format, args);
586 va_end(args);
587}
588
589bool GBAIsROM(struct VFile* vf) {
590 if (vf->seek(vf, 4, SEEK_SET) < 0) {
591 return false;
592 }
593 uint64_t signature;
594 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
595 return false;
596 }
597 return signature == GBA_ROM_MAGIC;
598}
599
600void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
601 struct GBA* gba = (struct GBA*) cpu->master;
602 enum GBALogLevel level = GBA_LOG_FATAL;
603 if (gba->debugger) {
604 level = GBA_LOG_STUB;
605 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP);
606 }
607 GBALog(gba, level, "Stub opcode: %08x", opcode);
608}
609
610void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
611 struct GBA* gba = (struct GBA*) cpu->master;
612 GBALog(gba, GBA_LOG_WARN, "Illegal opcode: %08x", opcode);
613 if (gba->debugger) {
614 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP);
615 }
616}
617
618void _checkOverrides(struct GBA* gba, uint32_t id) {
619 int i;
620 for (i = 0; _overrides[i].id[0]; ++i) {
621 const uint32_t* overrideId = (const uint32_t*) _overrides[i].id;
622 if (*overrideId == id) {
623 switch (_overrides[i].type) {
624 case SAVEDATA_FLASH512:
625 case SAVEDATA_FLASH1M:
626 gba->memory.savedata.type = _overrides[i].type;
627 GBASavedataInitFlash(&gba->memory.savedata);
628 break;
629 case SAVEDATA_EEPROM:
630 GBASavedataInitEEPROM(&gba->memory.savedata);
631 break;
632 case SAVEDATA_SRAM:
633 GBASavedataInitSRAM(&gba->memory.savedata);
634 break;
635 case SAVEDATA_NONE:
636 break;
637 }
638
639 if (_overrides[i].gpio & GPIO_RTC) {
640 GBAGPIOInitRTC(&gba->memory.gpio);
641 }
642
643 if (_overrides[i].gpio & GPIO_GYRO) {
644 GBAGPIOInitGyro(&gba->memory.gpio);
645 }
646
647 if (_overrides[i].gpio & GPIO_RUMBLE) {
648 GBAGPIOInitRumble(&gba->memory.gpio);
649 }
650 return;
651 }
652 }
653}