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 struct GBA* gba = (struct GBA*) cpu->master;
184 GBAMemoryReset(gba);
185}
186
187static void GBAProcessEvents(struct ARMCore* cpu) {
188 do {
189 struct GBA* gba = (struct GBA*) cpu->master;
190 int32_t cycles = cpu->cycles;
191 int32_t nextEvent = INT_MAX;
192 int32_t testEvent;
193
194 if (gba->springIRQ) {
195 ARMRaiseIRQ(cpu);
196 gba->springIRQ = 0;
197 }
198
199 testEvent = GBAVideoProcessEvents(&gba->video, cycles);
200 if (testEvent < nextEvent) {
201 nextEvent = testEvent;
202 }
203
204 testEvent = GBAAudioProcessEvents(&gba->audio, cycles);
205 if (testEvent < nextEvent) {
206 nextEvent = testEvent;
207 }
208
209 testEvent = GBATimersProcessEvents(gba, cycles);
210 if (testEvent < nextEvent) {
211 nextEvent = testEvent;
212 }
213
214 testEvent = GBAMemoryRunDMAs(gba, cycles);
215 if (testEvent < nextEvent) {
216 nextEvent = testEvent;
217 }
218
219 testEvent = GBASIOProcessEvents(&gba->sio, cycles);
220 if (testEvent < nextEvent) {
221 nextEvent = testEvent;
222 }
223
224 cpu->cycles -= cycles;
225 cpu->nextEvent = nextEvent;
226
227 if (cpu->halted) {
228 cpu->cycles = cpu->nextEvent;
229 }
230 } while (cpu->cycles >= cpu->nextEvent);
231}
232
233static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
234 int32_t nextEvent = INT_MAX;
235 if (gba->timersEnabled) {
236 struct GBATimer* timer;
237 struct GBATimer* nextTimer;
238
239 timer = &gba->timers[0];
240 if (timer->enable) {
241 timer->nextEvent -= cycles;
242 timer->lastEvent -= cycles;
243 if (timer->nextEvent <= 0) {
244 timer->lastEvent = timer->nextEvent;
245 timer->nextEvent += timer->overflowInterval;
246 gba->memory.io[REG_TM0CNT_LO >> 1] = timer->reload;
247 timer->oldReload = timer->reload;
248
249 if (timer->doIrq) {
250 GBARaiseIRQ(gba, IRQ_TIMER0);
251 }
252
253 if (gba->audio.enable) {
254 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
255 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
256 }
257
258 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
259 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
260 }
261 }
262
263 nextTimer = &gba->timers[1];
264 if (nextTimer->countUp) {
265 ++gba->memory.io[REG_TM1CNT_LO >> 1];
266 if (!gba->memory.io[REG_TM1CNT_LO >> 1]) {
267 nextTimer->nextEvent = 0;
268 }
269 }
270 }
271 nextEvent = timer->nextEvent;
272 }
273
274 timer = &gba->timers[1];
275 if (timer->enable) {
276 timer->nextEvent -= cycles;
277 timer->lastEvent -= cycles;
278 if (timer->nextEvent <= 0) {
279 timer->lastEvent = timer->nextEvent;
280 timer->nextEvent += timer->overflowInterval;
281 gba->memory.io[REG_TM1CNT_LO >> 1] = timer->reload;
282 timer->oldReload = timer->reload;
283
284 if (timer->doIrq) {
285 GBARaiseIRQ(gba, IRQ_TIMER1);
286 }
287
288 if (gba->audio.enable) {
289 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
290 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
291 }
292
293 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
294 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
295 }
296 }
297
298 if (timer->countUp) {
299 timer->nextEvent = INT_MAX;
300 }
301
302 nextTimer = &gba->timers[2];
303 if (nextTimer->countUp) {
304 ++gba->memory.io[REG_TM2CNT_LO >> 1];
305 if (!gba->memory.io[REG_TM2CNT_LO >> 1]) {
306 nextTimer->nextEvent = 0;
307 }
308 }
309 }
310 if (timer->nextEvent < nextEvent) {
311 nextEvent = timer->nextEvent;
312 }
313 }
314
315 timer = &gba->timers[2];
316 if (timer->enable) {
317 timer->nextEvent -= cycles;
318 timer->lastEvent -= cycles;
319 nextEvent = timer->nextEvent;
320 if (timer->nextEvent <= 0) {
321 timer->lastEvent = timer->nextEvent;
322 timer->nextEvent += timer->overflowInterval;
323 gba->memory.io[REG_TM2CNT_LO >> 1] = timer->reload;
324 timer->oldReload = timer->reload;
325
326 if (timer->doIrq) {
327 GBARaiseIRQ(gba, IRQ_TIMER2);
328 }
329
330 if (timer->countUp) {
331 timer->nextEvent = INT_MAX;
332 }
333
334 nextTimer = &gba->timers[3];
335 if (nextTimer->countUp) {
336 ++gba->memory.io[REG_TM3CNT_LO >> 1];
337 if (!gba->memory.io[REG_TM3CNT_LO >> 1]) {
338 nextTimer->nextEvent = 0;
339 }
340 }
341 }
342 if (timer->nextEvent < nextEvent) {
343 nextEvent = timer->nextEvent;
344 }
345 }
346
347 timer = &gba->timers[3];
348 if (timer->enable) {
349 timer->nextEvent -= cycles;
350 timer->lastEvent -= cycles;
351 nextEvent = timer->nextEvent;
352 if (timer->nextEvent <= 0) {
353 timer->lastEvent = timer->nextEvent;
354 timer->nextEvent += timer->overflowInterval;
355 gba->memory.io[REG_TM3CNT_LO >> 1] = timer->reload;
356 timer->oldReload = timer->reload;
357
358 if (timer->doIrq) {
359 GBARaiseIRQ(gba, IRQ_TIMER3);
360 }
361
362 if (timer->countUp) {
363 timer->nextEvent = INT_MAX;
364 }
365 }
366 if (timer->nextEvent < nextEvent) {
367 nextEvent = timer->nextEvent;
368 }
369 }
370 }
371 return nextEvent;
372}
373
374void GBAAttachDebugger(struct GBA* gba, struct ARMDebugger* debugger) {
375 gba->debugger = debugger;
376}
377
378void GBADetachDebugger(struct GBA* gba) {
379 gba->debugger = 0;
380}
381
382void GBALoadROM(struct GBA* gba, struct VFile* vf, struct VFile* sav, const char* fname) {
383 gba->romVf = vf;
384 gba->pristineRomSize = vf->seek(vf, 0, SEEK_END);
385 vf->seek(vf, 0, SEEK_SET);
386 gba->pristineRom = vf->map(vf, SIZE_CART0, MEMORY_READ);
387 gba->memory.rom = gba->pristineRom;
388 gba->activeFile = fname;
389 gba->memory.romSize = gba->pristineRomSize;
390 GBASavedataInit(&gba->memory.savedata, sav);
391 GBAGPIOInit(&gba->memory.gpio, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
392 _checkOverrides(gba, ((struct GBACartridge*) gba->memory.rom)->id);
393 // TODO: error check
394}
395
396void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
397 gba->biosVf = vf;
398 gba->memory.bios = vf->map(vf, SIZE_BIOS, MEMORY_READ);
399 gba->memory.fullBios = 1;
400 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
401 GBALog(gba, GBA_LOG_DEBUG, "BIOS Checksum: 0x%X", checksum);
402 if (checksum == GBA_BIOS_CHECKSUM) {
403 GBALog(gba, GBA_LOG_INFO, "Official GBA BIOS detected");
404 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
405 GBALog(gba, GBA_LOG_INFO, "Official GBA (DS) BIOS detected");
406 } else {
407 GBALog(gba, GBA_LOG_WARN, "BIOS checksum incorrect");
408 }
409 gba->biosChecksum = checksum;
410 if ((gba->cpu->gprs[ARM_PC] >> BASE_OFFSET) == BASE_BIOS) {
411 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
412 }
413 // TODO: error check
414}
415
416void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
417 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
418 if (!patchedSize) {
419 return;
420 }
421 gba->memory.rom = anonymousMemoryMap(patchedSize);
422 memcpy(gba->memory.rom, gba->pristineRom, gba->memory.romSize > patchedSize ? patchedSize : gba->memory.romSize);
423 if (!patch->applyPatch(patch, gba->memory.rom, patchedSize)) {
424 mappedMemoryFree(gba->memory.rom, patchedSize);
425 gba->memory.rom = gba->pristineRom;
426 return;
427 }
428 gba->memory.romSize = patchedSize;
429}
430
431void GBATimerUpdateRegister(struct GBA* gba, int timer) {
432 struct GBATimer* currentTimer = &gba->timers[timer];
433 if (currentTimer->enable && !currentTimer->countUp) {
434 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> currentTimer->prescaleBits);
435 }
436}
437
438void GBATimerWriteTMCNT_LO(struct GBA* gba, int timer, uint16_t reload) {
439 gba->timers[timer].reload = reload;
440}
441
442void GBATimerWriteTMCNT_HI(struct GBA* gba, int timer, uint16_t control) {
443 struct GBATimer* currentTimer = &gba->timers[timer];
444 GBATimerUpdateRegister(gba, timer);
445
446 int oldPrescale = currentTimer->prescaleBits;
447 switch (control & 0x0003) {
448 case 0x0000:
449 currentTimer->prescaleBits = 0;
450 break;
451 case 0x0001:
452 currentTimer->prescaleBits = 6;
453 break;
454 case 0x0002:
455 currentTimer->prescaleBits = 8;
456 break;
457 case 0x0003:
458 currentTimer->prescaleBits = 10;
459 break;
460 }
461 currentTimer->countUp = !!(control & 0x0004);
462 currentTimer->doIrq = !!(control & 0x0040);
463 currentTimer->overflowInterval = (0x10000 - currentTimer->reload) << currentTimer->prescaleBits;
464 int wasEnabled = currentTimer->enable;
465 currentTimer->enable = !!(control & 0x0080);
466 if (!wasEnabled && currentTimer->enable) {
467 if (!currentTimer->countUp) {
468 currentTimer->nextEvent = gba->cpu->cycles + currentTimer->overflowInterval;
469 } else {
470 currentTimer->nextEvent = INT_MAX;
471 }
472 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->reload;
473 currentTimer->oldReload = currentTimer->reload;
474 currentTimer->lastEvent = 0;
475 gba->timersEnabled |= 1 << timer;
476 } else if (wasEnabled && !currentTimer->enable) {
477 if (!currentTimer->countUp) {
478 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> oldPrescale);
479 }
480 gba->timersEnabled &= ~(1 << timer);
481 } else if (currentTimer->prescaleBits != oldPrescale && !currentTimer->countUp) {
482 // FIXME: this might be before present
483 currentTimer->nextEvent = currentTimer->lastEvent + currentTimer->overflowInterval;
484 }
485
486 if (currentTimer->nextEvent < gba->cpu->nextEvent) {
487 gba->cpu->nextEvent = currentTimer->nextEvent;
488 }
489};
490
491void GBAWriteIE(struct GBA* gba, uint16_t value) {
492 if (value & (1 << IRQ_KEYPAD)) {
493 GBALog(gba, GBA_LOG_STUB, "Keypad interrupts not implemented");
494 }
495
496 if (value & (1 << IRQ_GAMEPAK)) {
497 GBALog(gba, GBA_LOG_STUB, "Gamepak interrupts not implemented");
498 }
499
500 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
501 ARMRaiseIRQ(gba->cpu);
502 }
503}
504
505void GBAWriteIME(struct GBA* gba, uint16_t value) {
506 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
507 ARMRaiseIRQ(gba->cpu);
508 }
509}
510
511void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
512 gba->memory.io[REG_IF >> 1] |= 1 << irq;
513 gba->cpu->halted = 0;
514
515 if (gba->memory.io[REG_IME >> 1] && (gba->memory.io[REG_IE >> 1] & 1 << irq)) {
516 ARMRaiseIRQ(gba->cpu);
517 }
518}
519
520void GBATestIRQ(struct ARMCore* cpu) {
521 struct GBA* gba = (struct GBA*) cpu->master;
522 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
523 gba->springIRQ = 1;
524 gba->cpu->nextEvent = 0;
525 }
526}
527
528void GBAHalt(struct GBA* gba) {
529 gba->cpu->nextEvent = 0;
530 gba->cpu->halted = 1;
531}
532
533static void _GBAVLog(struct GBA* gba, enum GBALogLevel level, const char* format, va_list args) {
534 if (!gba) {
535 struct GBAThread* threadContext = GBAThreadGetContext();
536 if (threadContext) {
537 gba = threadContext->gba;
538 }
539 }
540
541 if (gba && gba->logHandler) {
542 gba->logHandler(gba, level, format, args);
543 return;
544 }
545
546 if (gba && !(level & gba->logLevel) && level != GBA_LOG_FATAL) {
547 return;
548 }
549
550 vprintf(format, args);
551 printf("\n");
552
553 if (level == GBA_LOG_FATAL) {
554 abort();
555 }
556}
557
558void GBALog(struct GBA* gba, enum GBALogLevel level, const char* format, ...) {
559 va_list args;
560 va_start(args, format);
561 _GBAVLog(gba, level, format, args);
562 va_end(args);
563}
564
565void GBADebuggerLogShim(struct ARMDebugger* debugger, enum DebuggerLogLevel level, const char* format, ...) {
566 struct GBA* gba = 0;
567 if (debugger->cpu) {
568 gba = (struct GBA*) debugger->cpu->master;
569 }
570
571 enum GBALogLevel gbaLevel;
572 switch (level) {
573 case DEBUGGER_LOG_DEBUG:
574 gbaLevel = GBA_LOG_DEBUG;
575 break;
576 case DEBUGGER_LOG_INFO:
577 gbaLevel = GBA_LOG_INFO;
578 break;
579 case DEBUGGER_LOG_WARN:
580 gbaLevel = GBA_LOG_WARN;
581 break;
582 case DEBUGGER_LOG_ERROR:
583 gbaLevel = GBA_LOG_ERROR;
584 break;
585 }
586 va_list args;
587 va_start(args, format);
588 _GBAVLog(gba, gbaLevel, format, args);
589 va_end(args);
590}
591
592bool GBAIsROM(struct VFile* vf) {
593 if (vf->seek(vf, 4, SEEK_SET) < 0) {
594 return false;
595 }
596 uint64_t signature;
597 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
598 return false;
599 }
600 return signature == GBA_ROM_MAGIC;
601}
602
603void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
604 struct GBA* gba = (struct GBA*) cpu->master;
605 enum GBALogLevel level = GBA_LOG_FATAL;
606 if (gba->debugger) {
607 level = GBA_LOG_STUB;
608 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP);
609 }
610 GBALog(gba, level, "Stub opcode: %08x", opcode);
611}
612
613void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
614 struct GBA* gba = (struct GBA*) cpu->master;
615 GBALog(gba, GBA_LOG_WARN, "Illegal opcode: %08x", opcode);
616 if (gba->debugger) {
617 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP);
618 }
619}
620
621void _checkOverrides(struct GBA* gba, uint32_t id) {
622 int i;
623 for (i = 0; _overrides[i].id[0]; ++i) {
624 const uint32_t* overrideId = (const uint32_t*) _overrides[i].id;
625 if (*overrideId == id) {
626 switch (_overrides[i].type) {
627 case SAVEDATA_FLASH512:
628 case SAVEDATA_FLASH1M:
629 gba->memory.savedata.type = _overrides[i].type;
630 GBASavedataInitFlash(&gba->memory.savedata);
631 break;
632 case SAVEDATA_EEPROM:
633 GBASavedataInitEEPROM(&gba->memory.savedata);
634 break;
635 case SAVEDATA_SRAM:
636 GBASavedataInitSRAM(&gba->memory.savedata);
637 break;
638 case SAVEDATA_NONE:
639 break;
640 }
641
642 if (_overrides[i].gpio & GPIO_RTC) {
643 GBAGPIOInitRTC(&gba->memory.gpio);
644 }
645
646 if (_overrides[i].gpio & GPIO_GYRO) {
647 GBAGPIOInitGyro(&gba->memory.gpio);
648 }
649
650 if (_overrides[i].gpio & GPIO_RUMBLE) {
651 GBAGPIOInitRumble(&gba->memory.gpio);
652 }
653 return;
654 }
655 }
656}