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