src/gba/gba.c (view raw)
1/* Copyright (c) 2013-2014 Jeffrey Pfau
2 *
3 * This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6#include "gba.h"
7
8#include "gba-bios.h"
9#include "gba-io.h"
10#include "gba-rr.h"
11#include "gba-sio.h"
12#include "gba-thread.h"
13
14#include "util/crc32.h"
15#include "util/memory.h"
16#include "util/patch.h"
17#include "util/vfs.h"
18
19const uint32_t GBA_ARM7TDMI_FREQUENCY = 0x1000000;
20const uint32_t GBA_COMPONENT_MAGIC = 0x1000000;
21
22static const size_t GBA_ROM_MAGIC_OFFSET = 2;
23static const uint8_t GBA_ROM_MAGIC[] = { 0x00, 0xEA };
24
25enum {
26 SP_BASE_SYSTEM = 0x03FFFF00,
27 SP_BASE_IRQ = 0x03FFFFA0,
28 SP_BASE_SUPERVISOR = 0x03FFFFE0
29};
30
31struct GBACartridgeOverride {
32 const char id[4];
33 enum SavedataType type;
34 int gpio;
35 uint32_t busyLoop;
36};
37
38static const struct GBACartridgeOverride _overrides[] = {
39 // Boktai: The Sun is in Your Hand
40 { "U3IE", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
41 { "U3IP", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
42
43 // Boktai 2: Solar Boy Django
44 { "U32E", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
45 { "U32P", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
46
47 // Drill Dozer
48 { "V49J", SAVEDATA_SRAM, GPIO_RUMBLE, -1 },
49 { "V49E", SAVEDATA_SRAM, GPIO_RUMBLE, -1 },
50
51 // Final Fantasy Tactics Advance
52 { "AFXE", SAVEDATA_FLASH512, GPIO_NONE, 0x8000418 },
53
54 // Mega Man Battle Network
55 { "AREE", SAVEDATA_SRAM, GPIO_NONE, 0x800032E },
56
57 // Pokemon Ruby
58 { "AXVJ", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
59 { "AXVE", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
60 { "AXVP", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
61 { "AXVI", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
62 { "AXVS", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
63 { "AXVD", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
64 { "AXVF", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
65
66 // Pokemon Sapphire
67 { "AXPJ", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
68 { "AXPE", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
69 { "AXPP", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
70 { "AXPI", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
71 { "AXPS", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
72 { "AXPD", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
73 { "AXPF", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
74
75 // Pokemon Emerald
76 { "BPEJ", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
77 { "BPEE", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
78 { "BPEP", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
79 { "BPEI", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
80 { "BPES", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
81 { "BPED", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
82 { "BPEF", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
83
84 // Pokemon Mystery Dungeon
85 { "B24J", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
86 { "B24E", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
87 { "B24P", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
88 { "B24U", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
89
90 // Pokemon FireRed
91 { "BPRJ", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
92 { "BPRE", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
93 { "BPRP", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
94
95 // Pokemon LeafGreen
96 { "BPGJ", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
97 { "BPGE", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
98 { "BPGP", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
99
100 // RockMan EXE 4.5 - Real Operation
101 { "BR4J", SAVEDATA_FLASH512, GPIO_RTC, -1 },
102
103 // Super Mario Advance 4
104 { "AX4J", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
105 { "AX4E", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
106 { "AX4P", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
107
108 // Wario Ware Twisted
109 { "RZWJ", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO, -1 },
110 { "RZWE", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO, -1 },
111 { "RZWP", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO, -1 },
112
113 { { 0, 0, 0, 0 }, 0, 0, -1 }
114};
115
116static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component);
117static void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh);
118static void GBAProcessEvents(struct ARMCore* cpu);
119static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles);
120static void GBAHitStub(struct ARMCore* cpu, uint32_t opcode);
121static void GBAIllegal(struct ARMCore* cpu, uint32_t opcode);
122
123static void _checkOverrides(struct GBA* gba, uint32_t code);
124
125void GBACreate(struct GBA* gba) {
126 gba->d.id = GBA_COMPONENT_MAGIC;
127 gba->d.init = GBAInit;
128 gba->d.deinit = 0;
129}
130
131static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component) {
132 struct GBA* gba = (struct GBA*) component;
133 gba->cpu = cpu;
134 gba->debugger = 0;
135
136 GBAInterruptHandlerInit(&cpu->irqh);
137 GBAMemoryInit(gba);
138 GBASavedataInit(&gba->memory.savedata, 0);
139
140 gba->video.p = gba;
141 GBAVideoInit(&gba->video);
142
143 gba->audio.p = gba;
144 GBAAudioInit(&gba->audio, GBA_AUDIO_SAMPLES);
145
146 GBAIOInit(gba);
147
148 gba->sio.p = gba;
149 GBASIOInit(&gba->sio);
150
151 gba->timersEnabled = 0;
152 memset(gba->timers, 0, sizeof(gba->timers));
153
154 gba->springIRQ = 0;
155 gba->keySource = 0;
156 gba->rotationSource = 0;
157 gba->rumble = 0;
158 gba->rr = 0;
159
160 gba->romVf = 0;
161 gba->biosVf = 0;
162
163 gba->logLevel = GBA_LOG_INFO | GBA_LOG_WARN | GBA_LOG_ERROR | GBA_LOG_FATAL;
164
165 gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
166
167 gba->busyLoop = -1;
168}
169
170void GBADestroy(struct GBA* gba) {
171 if (gba->pristineRom == gba->memory.rom) {
172 gba->memory.rom = 0;
173 }
174
175 if (gba->romVf) {
176 gba->romVf->unmap(gba->romVf, gba->pristineRom, gba->pristineRomSize);
177 }
178
179 if (gba->biosVf) {
180 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
181 }
182
183 GBAMemoryDeinit(gba);
184 GBAVideoDeinit(&gba->video);
185 GBAAudioDeinit(&gba->audio);
186 GBARRContextDestroy(gba);
187}
188
189void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
190 irqh->reset = GBAReset;
191 irqh->processEvents = GBAProcessEvents;
192 irqh->swi16 = GBASwi16;
193 irqh->swi32 = GBASwi32;
194 irqh->hitIllegal = GBAIllegal;
195 irqh->readCPSR = GBATestIRQ;
196 irqh->hitStub = GBAHitStub;
197}
198
199void GBAReset(struct ARMCore* cpu) {
200 ARMSetPrivilegeMode(cpu, MODE_IRQ);
201 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
202 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
203 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
204 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
205 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
206
207 struct GBA* gba = (struct GBA*) cpu->master;
208 if (!GBARRIsPlaying(gba->rr) && !GBARRIsRecording(gba->rr)) {
209 GBASavedataUnmask(&gba->memory.savedata);
210 }
211 GBAMemoryReset(gba);
212 GBAVideoReset(&gba->video);
213 GBAAudioReset(&gba->audio);
214 GBAIOInit(gba);
215
216 GBASIODeinit(&gba->sio);
217 GBASIOInit(&gba->sio);
218
219 gba->timersEnabled = 0;
220 memset(gba->timers, 0, sizeof(gba->timers));
221}
222
223static void GBAProcessEvents(struct ARMCore* cpu) {
224 do {
225 struct GBA* gba = (struct GBA*) cpu->master;
226 int32_t cycles = cpu->cycles;
227 int32_t nextEvent = INT_MAX;
228 int32_t testEvent;
229
230 gba->bus = cpu->prefetch;
231 if (cpu->executionMode == MODE_THUMB) {
232 gba->bus |= cpu->prefetch << 16;
233 }
234
235 if (gba->springIRQ) {
236 ARMRaiseIRQ(cpu);
237 gba->springIRQ = 0;
238 }
239
240 testEvent = GBAVideoProcessEvents(&gba->video, cycles);
241 if (testEvent < nextEvent) {
242 nextEvent = testEvent;
243 }
244
245 testEvent = GBAAudioProcessEvents(&gba->audio, cycles);
246 if (testEvent < nextEvent) {
247 nextEvent = testEvent;
248 }
249
250 testEvent = GBATimersProcessEvents(gba, cycles);
251 if (testEvent < nextEvent) {
252 nextEvent = testEvent;
253 }
254
255 testEvent = GBAMemoryRunDMAs(gba, cycles);
256 if (testEvent < nextEvent) {
257 nextEvent = testEvent;
258 }
259
260 testEvent = GBASIOProcessEvents(&gba->sio, cycles);
261 if (testEvent < nextEvent) {
262 nextEvent = testEvent;
263 }
264
265 cpu->cycles -= cycles;
266 cpu->nextEvent = nextEvent;
267
268 if (cpu->halted) {
269 cpu->cycles = cpu->nextEvent;
270 }
271 } while (cpu->cycles >= cpu->nextEvent);
272}
273
274static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
275 int32_t nextEvent = INT_MAX;
276 if (gba->timersEnabled) {
277 struct GBATimer* timer;
278 struct GBATimer* nextTimer;
279
280 timer = &gba->timers[0];
281 if (timer->enable) {
282 timer->nextEvent -= cycles;
283 timer->lastEvent -= cycles;
284 if (timer->nextEvent <= 0) {
285 timer->lastEvent = timer->nextEvent;
286 timer->nextEvent += timer->overflowInterval;
287 gba->memory.io[REG_TM0CNT_LO >> 1] = timer->reload;
288 timer->oldReload = timer->reload;
289
290 if (timer->doIrq) {
291 GBARaiseIRQ(gba, IRQ_TIMER0);
292 }
293
294 if (gba->audio.enable) {
295 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
296 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
297 }
298
299 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
300 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
301 }
302 }
303
304 nextTimer = &gba->timers[1];
305 if (nextTimer->countUp) {
306 ++gba->memory.io[REG_TM1CNT_LO >> 1];
307 if (!gba->memory.io[REG_TM1CNT_LO >> 1]) {
308 nextTimer->nextEvent = 0;
309 }
310 }
311 }
312 nextEvent = timer->nextEvent;
313 }
314
315 timer = &gba->timers[1];
316 if (timer->enable) {
317 timer->nextEvent -= cycles;
318 timer->lastEvent -= cycles;
319 if (timer->nextEvent <= 0) {
320 timer->lastEvent = timer->nextEvent;
321 timer->nextEvent += timer->overflowInterval;
322 gba->memory.io[REG_TM1CNT_LO >> 1] = timer->reload;
323 timer->oldReload = timer->reload;
324
325 if (timer->doIrq) {
326 GBARaiseIRQ(gba, IRQ_TIMER1);
327 }
328
329 if (gba->audio.enable) {
330 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
331 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
332 }
333
334 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
335 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
336 }
337 }
338
339 if (timer->countUp) {
340 timer->nextEvent = INT_MAX;
341 }
342
343 nextTimer = &gba->timers[2];
344 if (nextTimer->countUp) {
345 ++gba->memory.io[REG_TM2CNT_LO >> 1];
346 if (!gba->memory.io[REG_TM2CNT_LO >> 1]) {
347 nextTimer->nextEvent = 0;
348 }
349 }
350 }
351 if (timer->nextEvent < nextEvent) {
352 nextEvent = timer->nextEvent;
353 }
354 }
355
356 timer = &gba->timers[2];
357 if (timer->enable) {
358 timer->nextEvent -= cycles;
359 timer->lastEvent -= cycles;
360 nextEvent = timer->nextEvent;
361 if (timer->nextEvent <= 0) {
362 timer->lastEvent = timer->nextEvent;
363 timer->nextEvent += timer->overflowInterval;
364 gba->memory.io[REG_TM2CNT_LO >> 1] = timer->reload;
365 timer->oldReload = timer->reload;
366
367 if (timer->doIrq) {
368 GBARaiseIRQ(gba, IRQ_TIMER2);
369 }
370
371 if (timer->countUp) {
372 timer->nextEvent = INT_MAX;
373 }
374
375 nextTimer = &gba->timers[3];
376 if (nextTimer->countUp) {
377 ++gba->memory.io[REG_TM3CNT_LO >> 1];
378 if (!gba->memory.io[REG_TM3CNT_LO >> 1]) {
379 nextTimer->nextEvent = 0;
380 }
381 }
382 }
383 if (timer->nextEvent < nextEvent) {
384 nextEvent = timer->nextEvent;
385 }
386 }
387
388 timer = &gba->timers[3];
389 if (timer->enable) {
390 timer->nextEvent -= cycles;
391 timer->lastEvent -= cycles;
392 nextEvent = timer->nextEvent;
393 if (timer->nextEvent <= 0) {
394 timer->lastEvent = timer->nextEvent;
395 timer->nextEvent += timer->overflowInterval;
396 gba->memory.io[REG_TM3CNT_LO >> 1] = timer->reload;
397 timer->oldReload = timer->reload;
398
399 if (timer->doIrq) {
400 GBARaiseIRQ(gba, IRQ_TIMER3);
401 }
402
403 if (timer->countUp) {
404 timer->nextEvent = INT_MAX;
405 }
406 }
407 if (timer->nextEvent < nextEvent) {
408 nextEvent = timer->nextEvent;
409 }
410 }
411 }
412 return nextEvent;
413}
414
415void GBAAttachDebugger(struct GBA* gba, struct ARMDebugger* debugger) {
416 gba->debugger = debugger;
417}
418
419void GBADetachDebugger(struct GBA* gba) {
420 gba->debugger = 0;
421}
422
423void GBALoadROM(struct GBA* gba, struct VFile* vf, struct VFile* sav, const char* fname) {
424 gba->romVf = vf;
425 gba->pristineRomSize = vf->seek(vf, 0, SEEK_END);
426 vf->seek(vf, 0, SEEK_SET);
427 if (gba->pristineRomSize > SIZE_CART0) {
428 gba->pristineRomSize = SIZE_CART0;
429 }
430 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
431 gba->memory.rom = gba->pristineRom;
432 gba->activeFile = fname;
433 gba->memory.romSize = gba->pristineRomSize;
434 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
435 GBASavedataInit(&gba->memory.savedata, sav);
436 GBAGPIOInit(&gba->memory.gpio, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
437 _checkOverrides(gba, ((struct GBACartridge*) gba->memory.rom)->id);
438 // TODO: error check
439}
440
441void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
442 gba->biosVf = vf;
443 gba->memory.bios = vf->map(vf, SIZE_BIOS, MAP_READ);
444 gba->memory.fullBios = 1;
445 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
446 GBALog(gba, GBA_LOG_DEBUG, "BIOS Checksum: 0x%X", checksum);
447 if (checksum == GBA_BIOS_CHECKSUM) {
448 GBALog(gba, GBA_LOG_INFO, "Official GBA BIOS detected");
449 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
450 GBALog(gba, GBA_LOG_INFO, "Official GBA (DS) BIOS detected");
451 } else {
452 GBALog(gba, GBA_LOG_WARN, "BIOS checksum incorrect");
453 }
454 gba->biosChecksum = checksum;
455 if (gba->memory.activeRegion == REGION_BIOS) {
456 gba->cpu->memory.activeRegion = gba->memory.bios;
457 }
458 // TODO: error check
459}
460
461void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
462 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
463 if (!patchedSize) {
464 return;
465 }
466 gba->memory.rom = anonymousMemoryMap(patchedSize);
467 memcpy(gba->memory.rom, gba->pristineRom, gba->memory.romSize > patchedSize ? patchedSize : gba->memory.romSize);
468 if (!patch->applyPatch(patch, gba->memory.rom, patchedSize)) {
469 mappedMemoryFree(gba->memory.rom, patchedSize);
470 gba->memory.rom = gba->pristineRom;
471 return;
472 }
473 gba->memory.romSize = patchedSize;
474 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
475}
476
477void GBATimerUpdateRegister(struct GBA* gba, int timer) {
478 struct GBATimer* currentTimer = &gba->timers[timer];
479 if (currentTimer->enable && !currentTimer->countUp) {
480 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> currentTimer->prescaleBits);
481 }
482}
483
484void GBATimerWriteTMCNT_LO(struct GBA* gba, int timer, uint16_t reload) {
485 gba->timers[timer].reload = reload;
486}
487
488void GBATimerWriteTMCNT_HI(struct GBA* gba, int timer, uint16_t control) {
489 struct GBATimer* currentTimer = &gba->timers[timer];
490 GBATimerUpdateRegister(gba, timer);
491
492 int oldPrescale = currentTimer->prescaleBits;
493 switch (control & 0x0003) {
494 case 0x0000:
495 currentTimer->prescaleBits = 0;
496 break;
497 case 0x0001:
498 currentTimer->prescaleBits = 6;
499 break;
500 case 0x0002:
501 currentTimer->prescaleBits = 8;
502 break;
503 case 0x0003:
504 currentTimer->prescaleBits = 10;
505 break;
506 }
507 currentTimer->countUp = !!(control & 0x0004);
508 currentTimer->doIrq = !!(control & 0x0040);
509 currentTimer->overflowInterval = (0x10000 - currentTimer->reload) << currentTimer->prescaleBits;
510 int wasEnabled = currentTimer->enable;
511 currentTimer->enable = !!(control & 0x0080);
512 if (!wasEnabled && currentTimer->enable) {
513 if (!currentTimer->countUp) {
514 currentTimer->nextEvent = gba->cpu->cycles + currentTimer->overflowInterval;
515 } else {
516 currentTimer->nextEvent = INT_MAX;
517 }
518 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->reload;
519 currentTimer->oldReload = currentTimer->reload;
520 currentTimer->lastEvent = 0;
521 gba->timersEnabled |= 1 << timer;
522 } else if (wasEnabled && !currentTimer->enable) {
523 if (!currentTimer->countUp) {
524 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> oldPrescale);
525 }
526 gba->timersEnabled &= ~(1 << timer);
527 } else if (currentTimer->prescaleBits != oldPrescale && !currentTimer->countUp) {
528 // FIXME: this might be before present
529 currentTimer->nextEvent = currentTimer->lastEvent + currentTimer->overflowInterval;
530 }
531
532 if (currentTimer->nextEvent < gba->cpu->nextEvent) {
533 gba->cpu->nextEvent = currentTimer->nextEvent;
534 }
535};
536
537void GBAWriteIE(struct GBA* gba, uint16_t value) {
538 if (value & (1 << IRQ_KEYPAD)) {
539 GBALog(gba, GBA_LOG_STUB, "Keypad interrupts not implemented");
540 }
541
542 if (value & (1 << IRQ_GAMEPAK)) {
543 GBALog(gba, GBA_LOG_STUB, "Gamepak interrupts not implemented");
544 }
545
546 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
547 ARMRaiseIRQ(gba->cpu);
548 }
549}
550
551void GBAWriteIME(struct GBA* gba, uint16_t value) {
552 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
553 ARMRaiseIRQ(gba->cpu);
554 }
555}
556
557void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
558 gba->memory.io[REG_IF >> 1] |= 1 << irq;
559 gba->cpu->halted = 0;
560
561 if (gba->memory.io[REG_IME >> 1] && (gba->memory.io[REG_IE >> 1] & 1 << irq)) {
562 ARMRaiseIRQ(gba->cpu);
563 }
564}
565
566void GBATestIRQ(struct ARMCore* cpu) {
567 struct GBA* gba = (struct GBA*) cpu->master;
568 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
569 gba->springIRQ = 1;
570 gba->cpu->nextEvent = 0;
571 }
572}
573
574void GBAHalt(struct GBA* gba) {
575 gba->cpu->nextEvent = 0;
576 gba->cpu->halted = 1;
577}
578
579static void _GBAVLog(struct GBA* gba, enum GBALogLevel level, const char* format, va_list args) {
580 struct GBAThread* threadContext = GBAThreadGetContext();
581 if (threadContext) {
582 if (!gba) {
583 gba = threadContext->gba;
584 }
585 }
586
587 if (gba && !(level & gba->logLevel) && level != GBA_LOG_FATAL) {
588 return;
589 }
590
591 if (threadContext && threadContext->logHandler) {
592 threadContext->logHandler(threadContext, level, format, args);
593 return;
594 }
595
596 vprintf(format, args);
597 printf("\n");
598
599 if (level == GBA_LOG_FATAL) {
600 abort();
601 }
602}
603
604void GBALog(struct GBA* gba, enum GBALogLevel level, const char* format, ...) {
605 va_list args;
606 va_start(args, format);
607 _GBAVLog(gba, level, format, args);
608 va_end(args);
609}
610
611void GBADebuggerLogShim(struct ARMDebugger* debugger, enum DebuggerLogLevel level, const char* format, ...) {
612 struct GBA* gba = 0;
613 if (debugger->cpu) {
614 gba = (struct GBA*) debugger->cpu->master;
615 }
616
617 enum GBALogLevel gbaLevel;
618 switch (level) {
619 default: // Avoids compiler warning
620 case DEBUGGER_LOG_DEBUG:
621 gbaLevel = GBA_LOG_DEBUG;
622 break;
623 case DEBUGGER_LOG_INFO:
624 gbaLevel = GBA_LOG_INFO;
625 break;
626 case DEBUGGER_LOG_WARN:
627 gbaLevel = GBA_LOG_WARN;
628 break;
629 case DEBUGGER_LOG_ERROR:
630 gbaLevel = GBA_LOG_ERROR;
631 break;
632 }
633 va_list args;
634 va_start(args, format);
635 _GBAVLog(gba, gbaLevel, format, args);
636 va_end(args);
637}
638
639bool GBAIsROM(struct VFile* vf) {
640 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
641 return false;
642 }
643 uint8_t signature[sizeof(GBA_ROM_MAGIC)];
644 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
645 return false;
646 }
647 return memcmp(signature, GBA_ROM_MAGIC, sizeof(signature)) == 0;
648}
649
650void GBAGetGameCode(struct GBA* gba, char* out) {
651 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->id, 4);
652}
653
654void GBAGetGameTitle(struct GBA* gba, char* out) {
655 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
656}
657
658void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
659 struct GBA* gba = (struct GBA*) cpu->master;
660 enum GBALogLevel level = GBA_LOG_FATAL;
661 if (gba->debugger) {
662 level = GBA_LOG_STUB;
663 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP);
664 }
665 GBALog(gba, level, "Stub opcode: %08x", opcode);
666}
667
668void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
669 struct GBA* gba = (struct GBA*) cpu->master;
670 GBALog(gba, GBA_LOG_WARN, "Illegal opcode: %08x", opcode);
671 if (gba->debugger) {
672 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP);
673 }
674}
675
676void _checkOverrides(struct GBA* gba, uint32_t id) {
677 int i;
678 gba->busyLoop = -1;
679 if ((id & 0xFF) == 'F') {
680 GBALog(gba, GBA_LOG_DEBUG, "Found Classic NES Series game, using EEPROM saves");
681 GBASavedataInitEEPROM(&gba->memory.savedata);
682 return;
683 }
684 for (i = 0; _overrides[i].id[0]; ++i) {
685 const uint32_t* overrideId = (const uint32_t*) _overrides[i].id;
686 if (*overrideId == id) {
687 GBALog(gba, GBA_LOG_DEBUG, "Found override for game %s!", _overrides[i].id);
688 switch (_overrides[i].type) {
689 case SAVEDATA_FLASH512:
690 case SAVEDATA_FLASH1M:
691 gba->memory.savedata.type = _overrides[i].type;
692 GBASavedataInitFlash(&gba->memory.savedata);
693 break;
694 case SAVEDATA_EEPROM:
695 GBASavedataInitEEPROM(&gba->memory.savedata);
696 break;
697 case SAVEDATA_SRAM:
698 GBASavedataInitSRAM(&gba->memory.savedata);
699 break;
700 case SAVEDATA_NONE:
701 break;
702 }
703
704 if (_overrides[i].gpio & GPIO_RTC) {
705 GBAGPIOInitRTC(&gba->memory.gpio);
706 }
707
708 if (_overrides[i].gpio & GPIO_GYRO) {
709 GBAGPIOInitGyro(&gba->memory.gpio);
710 }
711
712 if (_overrides[i].gpio & GPIO_RUMBLE) {
713 GBAGPIOInitRumble(&gba->memory.gpio);
714 }
715
716 gba->busyLoop = _overrides[i].busyLoop;
717 return;
718 }
719 }
720}