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 "isa-inlines.h"
15
16#include "util/crc32.h"
17#include "util/memory.h"
18#include "util/patch.h"
19#include "util/vfs.h"
20
21const uint32_t GBA_ARM7TDMI_FREQUENCY = 0x1000000;
22const uint32_t GBA_COMPONENT_MAGIC = 0x1000000;
23
24static const size_t GBA_ROM_MAGIC_OFFSET = 2;
25static const uint8_t GBA_ROM_MAGIC[] = { 0x00, 0xEA };
26
27enum {
28 SP_BASE_SYSTEM = 0x03FFFF00,
29 SP_BASE_IRQ = 0x03FFFFA0,
30 SP_BASE_SUPERVISOR = 0x03FFFFE0
31};
32
33struct GBACartridgeOverride {
34 const char id[4];
35 enum SavedataType type;
36 int gpio;
37 uint32_t busyLoop;
38};
39
40static const struct GBACartridgeOverride _overrides[] = {
41 // Boktai: The Sun is in Your Hand
42 { "U3IE", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
43 { "U3IP", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
44
45 // Boktai 2: Solar Boy Django
46 { "U32E", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
47 { "U32P", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
48
49 // Drill Dozer
50 { "V49J", SAVEDATA_SRAM, GPIO_RUMBLE, -1 },
51 { "V49E", SAVEDATA_SRAM, GPIO_RUMBLE, -1 },
52
53 // Final Fantasy Tactics Advance
54 { "AFXE", SAVEDATA_FLASH512, GPIO_NONE, 0x8000418 },
55
56 // Mega Man Battle Network
57 { "AREE", SAVEDATA_SRAM, GPIO_NONE, 0x800032E },
58
59 // Pokemon Ruby
60 { "AXVJ", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
61 { "AXVE", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
62 { "AXVP", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
63 { "AXVI", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
64 { "AXVS", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
65 { "AXVD", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
66 { "AXVF", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
67
68 // Pokemon Sapphire
69 { "AXPJ", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
70 { "AXPE", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
71 { "AXPP", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
72 { "AXPI", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
73 { "AXPS", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
74 { "AXPD", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
75 { "AXPF", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
76
77 // Pokemon Emerald
78 { "BPEJ", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
79 { "BPEE", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
80 { "BPEP", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
81 { "BPEI", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
82 { "BPES", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
83 { "BPED", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
84 { "BPEF", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
85
86 // Pokemon Mystery Dungeon
87 { "B24J", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
88 { "B24E", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
89 { "B24P", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
90 { "B24U", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
91
92 // Pokemon FireRed
93 { "BPRJ", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
94 { "BPRE", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
95 { "BPRP", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
96
97 // Pokemon LeafGreen
98 { "BPGJ", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
99 { "BPGE", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
100 { "BPGP", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
101
102 // RockMan EXE 4.5 - Real Operation
103 { "BR4J", SAVEDATA_FLASH512, GPIO_RTC, -1 },
104
105 // Super Mario Advance 4
106 { "AX4J", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
107 { "AX4E", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
108 { "AX4P", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
109
110 // Wario Ware Twisted
111 { "RZWJ", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO, -1 },
112 { "RZWE", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO, -1 },
113 { "RZWP", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO, -1 },
114
115 { { 0, 0, 0, 0 }, 0, 0, -1 }
116};
117
118static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component);
119static void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh);
120static void GBAProcessEvents(struct ARMCore* cpu);
121static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles);
122static void GBAHitStub(struct ARMCore* cpu, uint32_t opcode);
123static void GBAIllegal(struct ARMCore* cpu, uint32_t opcode);
124
125static void _checkOverrides(struct GBA* gba, uint32_t code);
126
127void GBACreate(struct GBA* gba) {
128 gba->d.id = GBA_COMPONENT_MAGIC;
129 gba->d.init = GBAInit;
130 gba->d.deinit = 0;
131}
132
133static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component) {
134 struct GBA* gba = (struct GBA*) component;
135 gba->cpu = cpu;
136 gba->debugger = 0;
137
138 GBAInterruptHandlerInit(&cpu->irqh);
139 GBAMemoryInit(gba);
140 GBASavedataInit(&gba->memory.savedata, 0);
141
142 gba->video.p = gba;
143 GBAVideoInit(&gba->video);
144
145 gba->audio.p = gba;
146 GBAAudioInit(&gba->audio, GBA_AUDIO_SAMPLES);
147
148 GBAIOInit(gba);
149
150 gba->sio.p = gba;
151 GBASIOInit(&gba->sio);
152
153 gba->timersEnabled = 0;
154 memset(gba->timers, 0, sizeof(gba->timers));
155
156 gba->springIRQ = 0;
157 gba->keySource = 0;
158 gba->rotationSource = 0;
159 gba->rumble = 0;
160 gba->rr = 0;
161
162 gba->romVf = 0;
163 gba->biosVf = 0;
164
165 gba->logLevel = GBA_LOG_INFO | GBA_LOG_WARN | GBA_LOG_ERROR | GBA_LOG_FATAL;
166
167 gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
168
169 gba->busyLoop = -1;
170}
171
172void GBADestroy(struct GBA* gba) {
173 if (gba->pristineRom == gba->memory.rom) {
174 gba->memory.rom = 0;
175 }
176
177 if (gba->romVf) {
178 gba->romVf->unmap(gba->romVf, gba->pristineRom, gba->pristineRomSize);
179 }
180
181 if (gba->biosVf) {
182 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
183 }
184
185 GBAMemoryDeinit(gba);
186 GBAVideoDeinit(&gba->video);
187 GBAAudioDeinit(&gba->audio);
188 GBARRContextDestroy(gba);
189}
190
191void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
192 irqh->reset = GBAReset;
193 irqh->processEvents = GBAProcessEvents;
194 irqh->swi16 = GBASwi16;
195 irqh->swi32 = GBASwi32;
196 irqh->hitIllegal = GBAIllegal;
197 irqh->readCPSR = GBATestIRQ;
198 irqh->hitStub = GBAHitStub;
199}
200
201void GBAReset(struct ARMCore* cpu) {
202 ARMSetPrivilegeMode(cpu, MODE_IRQ);
203 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
204 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
205 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
206 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
207 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
208
209 struct GBA* gba = (struct GBA*) cpu->master;
210 if (!GBARRIsPlaying(gba->rr) && !GBARRIsRecording(gba->rr)) {
211 GBASavedataUnmask(&gba->memory.savedata);
212 }
213 GBAMemoryReset(gba);
214 GBAVideoReset(&gba->video);
215 GBAAudioReset(&gba->audio);
216 GBAIOInit(gba);
217
218 GBASIODeinit(&gba->sio);
219 GBASIOInit(&gba->sio);
220
221 gba->timersEnabled = 0;
222 memset(gba->timers, 0, sizeof(gba->timers));
223}
224
225void GBASkipBIOS(struct ARMCore* cpu) {
226 if (cpu->gprs[ARM_PC] == BASE_RESET + WORD_SIZE_ARM) {
227 cpu->gprs[ARM_PC] = BASE_CART0;
228 int currentCycles = 0;
229 ARM_WRITE_PC;
230 }
231}
232
233static void GBAProcessEvents(struct ARMCore* cpu) {
234 do {
235 struct GBA* gba = (struct GBA*) cpu->master;
236 int32_t cycles = cpu->cycles;
237 int32_t nextEvent = INT_MAX;
238 int32_t testEvent;
239
240 gba->bus = cpu->prefetch[1];
241 if (cpu->executionMode == MODE_THUMB) {
242 gba->bus |= cpu->prefetch[1] << 16;
243 }
244
245 if (gba->springIRQ) {
246 ARMRaiseIRQ(cpu);
247 gba->springIRQ = 0;
248 }
249
250 testEvent = GBAVideoProcessEvents(&gba->video, cycles);
251 if (testEvent < nextEvent) {
252 nextEvent = testEvent;
253 }
254
255 testEvent = GBAAudioProcessEvents(&gba->audio, cycles);
256 if (testEvent < nextEvent) {
257 nextEvent = testEvent;
258 }
259
260 testEvent = GBATimersProcessEvents(gba, cycles);
261 if (testEvent < nextEvent) {
262 nextEvent = testEvent;
263 }
264
265 testEvent = GBAMemoryRunDMAs(gba, cycles);
266 if (testEvent < nextEvent) {
267 nextEvent = testEvent;
268 }
269
270 testEvent = GBASIOProcessEvents(&gba->sio, cycles);
271 if (testEvent < nextEvent) {
272 nextEvent = testEvent;
273 }
274
275 cpu->cycles -= cycles;
276 cpu->nextEvent = nextEvent;
277
278 if (cpu->halted) {
279 cpu->cycles = cpu->nextEvent;
280 }
281 } while (cpu->cycles >= cpu->nextEvent);
282}
283
284static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
285 int32_t nextEvent = INT_MAX;
286 if (gba->timersEnabled) {
287 struct GBATimer* timer;
288 struct GBATimer* nextTimer;
289
290 timer = &gba->timers[0];
291 if (timer->enable) {
292 timer->nextEvent -= cycles;
293 timer->lastEvent -= cycles;
294 if (timer->nextEvent <= 0) {
295 timer->lastEvent = timer->nextEvent;
296 timer->nextEvent += timer->overflowInterval;
297 gba->memory.io[REG_TM0CNT_LO >> 1] = timer->reload;
298 timer->oldReload = timer->reload;
299
300 if (timer->doIrq) {
301 GBARaiseIRQ(gba, IRQ_TIMER0);
302 }
303
304 if (gba->audio.enable) {
305 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
306 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
307 }
308
309 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
310 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
311 }
312 }
313
314 nextTimer = &gba->timers[1];
315 if (nextTimer->countUp) {
316 ++gba->memory.io[REG_TM1CNT_LO >> 1];
317 if (!gba->memory.io[REG_TM1CNT_LO >> 1]) {
318 nextTimer->nextEvent = 0;
319 }
320 }
321 }
322 nextEvent = timer->nextEvent;
323 }
324
325 timer = &gba->timers[1];
326 if (timer->enable) {
327 timer->nextEvent -= cycles;
328 timer->lastEvent -= cycles;
329 if (timer->nextEvent <= 0) {
330 timer->lastEvent = timer->nextEvent;
331 timer->nextEvent += timer->overflowInterval;
332 gba->memory.io[REG_TM1CNT_LO >> 1] = timer->reload;
333 timer->oldReload = timer->reload;
334
335 if (timer->doIrq) {
336 GBARaiseIRQ(gba, IRQ_TIMER1);
337 }
338
339 if (gba->audio.enable) {
340 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
341 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
342 }
343
344 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
345 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
346 }
347 }
348
349 if (timer->countUp) {
350 timer->nextEvent = INT_MAX;
351 }
352
353 nextTimer = &gba->timers[2];
354 if (nextTimer->countUp) {
355 ++gba->memory.io[REG_TM2CNT_LO >> 1];
356 if (!gba->memory.io[REG_TM2CNT_LO >> 1]) {
357 nextTimer->nextEvent = 0;
358 }
359 }
360 }
361 if (timer->nextEvent < nextEvent) {
362 nextEvent = timer->nextEvent;
363 }
364 }
365
366 timer = &gba->timers[2];
367 if (timer->enable) {
368 timer->nextEvent -= cycles;
369 timer->lastEvent -= cycles;
370 nextEvent = timer->nextEvent;
371 if (timer->nextEvent <= 0) {
372 timer->lastEvent = timer->nextEvent;
373 timer->nextEvent += timer->overflowInterval;
374 gba->memory.io[REG_TM2CNT_LO >> 1] = timer->reload;
375 timer->oldReload = timer->reload;
376
377 if (timer->doIrq) {
378 GBARaiseIRQ(gba, IRQ_TIMER2);
379 }
380
381 if (timer->countUp) {
382 timer->nextEvent = INT_MAX;
383 }
384
385 nextTimer = &gba->timers[3];
386 if (nextTimer->countUp) {
387 ++gba->memory.io[REG_TM3CNT_LO >> 1];
388 if (!gba->memory.io[REG_TM3CNT_LO >> 1]) {
389 nextTimer->nextEvent = 0;
390 }
391 }
392 }
393 if (timer->nextEvent < nextEvent) {
394 nextEvent = timer->nextEvent;
395 }
396 }
397
398 timer = &gba->timers[3];
399 if (timer->enable) {
400 timer->nextEvent -= cycles;
401 timer->lastEvent -= cycles;
402 nextEvent = timer->nextEvent;
403 if (timer->nextEvent <= 0) {
404 timer->lastEvent = timer->nextEvent;
405 timer->nextEvent += timer->overflowInterval;
406 gba->memory.io[REG_TM3CNT_LO >> 1] = timer->reload;
407 timer->oldReload = timer->reload;
408
409 if (timer->doIrq) {
410 GBARaiseIRQ(gba, IRQ_TIMER3);
411 }
412
413 if (timer->countUp) {
414 timer->nextEvent = INT_MAX;
415 }
416 }
417 if (timer->nextEvent < nextEvent) {
418 nextEvent = timer->nextEvent;
419 }
420 }
421 }
422 return nextEvent;
423}
424
425void GBAAttachDebugger(struct GBA* gba, struct ARMDebugger* debugger) {
426 gba->debugger = debugger;
427}
428
429void GBADetachDebugger(struct GBA* gba) {
430 gba->debugger = 0;
431}
432
433void GBALoadROM(struct GBA* gba, struct VFile* vf, struct VFile* sav, const char* fname) {
434 gba->romVf = vf;
435 gba->pristineRomSize = vf->seek(vf, 0, SEEK_END);
436 vf->seek(vf, 0, SEEK_SET);
437 if (gba->pristineRomSize > SIZE_CART0) {
438 gba->pristineRomSize = SIZE_CART0;
439 }
440 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
441 if (!gba->pristineRom) {
442 GBALog(gba, GBA_LOG_WARN, "Couldn't map ROM");
443 return;
444 }
445 gba->memory.rom = gba->pristineRom;
446 gba->activeFile = fname;
447 gba->memory.romSize = gba->pristineRomSize;
448 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
449 GBASavedataInit(&gba->memory.savedata, sav);
450 GBAGPIOInit(&gba->memory.gpio, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
451 _checkOverrides(gba, ((struct GBACartridge*) gba->memory.rom)->id);
452 // TODO: error check
453}
454
455void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
456 gba->biosVf = vf;
457 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
458 if (!bios) {
459 GBALog(gba, GBA_LOG_WARN, "Couldn't map BIOS");
460 return;
461 }
462 gba->memory.bios = bios;
463 gba->memory.fullBios = 1;
464 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
465 GBALog(gba, GBA_LOG_DEBUG, "BIOS Checksum: 0x%X", checksum);
466 if (checksum == GBA_BIOS_CHECKSUM) {
467 GBALog(gba, GBA_LOG_INFO, "Official GBA BIOS detected");
468 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
469 GBALog(gba, GBA_LOG_INFO, "Official GBA (DS) BIOS detected");
470 } else {
471 GBALog(gba, GBA_LOG_WARN, "BIOS checksum incorrect");
472 }
473 gba->biosChecksum = checksum;
474 if (gba->memory.activeRegion == REGION_BIOS) {
475 gba->cpu->memory.activeRegion = gba->memory.bios;
476 }
477 // TODO: error check
478}
479
480void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
481 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
482 if (!patchedSize) {
483 return;
484 }
485 gba->memory.rom = anonymousMemoryMap(patchedSize);
486 memcpy(gba->memory.rom, gba->pristineRom, gba->memory.romSize > patchedSize ? patchedSize : gba->memory.romSize);
487 if (!patch->applyPatch(patch, gba->memory.rom, patchedSize)) {
488 mappedMemoryFree(gba->memory.rom, patchedSize);
489 gba->memory.rom = gba->pristineRom;
490 return;
491 }
492 gba->memory.romSize = patchedSize;
493 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
494}
495
496void GBATimerUpdateRegister(struct GBA* gba, int timer) {
497 struct GBATimer* currentTimer = &gba->timers[timer];
498 if (currentTimer->enable && !currentTimer->countUp) {
499 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> currentTimer->prescaleBits);
500 }
501}
502
503void GBATimerWriteTMCNT_LO(struct GBA* gba, int timer, uint16_t reload) {
504 gba->timers[timer].reload = reload;
505}
506
507void GBATimerWriteTMCNT_HI(struct GBA* gba, int timer, uint16_t control) {
508 struct GBATimer* currentTimer = &gba->timers[timer];
509 GBATimerUpdateRegister(gba, timer);
510
511 int oldPrescale = currentTimer->prescaleBits;
512 switch (control & 0x0003) {
513 case 0x0000:
514 currentTimer->prescaleBits = 0;
515 break;
516 case 0x0001:
517 currentTimer->prescaleBits = 6;
518 break;
519 case 0x0002:
520 currentTimer->prescaleBits = 8;
521 break;
522 case 0x0003:
523 currentTimer->prescaleBits = 10;
524 break;
525 }
526 currentTimer->countUp = !!(control & 0x0004);
527 currentTimer->doIrq = !!(control & 0x0040);
528 currentTimer->overflowInterval = (0x10000 - currentTimer->reload) << currentTimer->prescaleBits;
529 int wasEnabled = currentTimer->enable;
530 currentTimer->enable = !!(control & 0x0080);
531 if (!wasEnabled && currentTimer->enable) {
532 if (!currentTimer->countUp) {
533 currentTimer->nextEvent = gba->cpu->cycles + currentTimer->overflowInterval;
534 } else {
535 currentTimer->nextEvent = INT_MAX;
536 }
537 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->reload;
538 currentTimer->oldReload = currentTimer->reload;
539 currentTimer->lastEvent = 0;
540 gba->timersEnabled |= 1 << timer;
541 } else if (wasEnabled && !currentTimer->enable) {
542 if (!currentTimer->countUp) {
543 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> oldPrescale);
544 }
545 gba->timersEnabled &= ~(1 << timer);
546 } else if (currentTimer->prescaleBits != oldPrescale && !currentTimer->countUp) {
547 // FIXME: this might be before present
548 currentTimer->nextEvent = currentTimer->lastEvent + currentTimer->overflowInterval;
549 }
550
551 if (currentTimer->nextEvent < gba->cpu->nextEvent) {
552 gba->cpu->nextEvent = currentTimer->nextEvent;
553 }
554};
555
556void GBAWriteIE(struct GBA* gba, uint16_t value) {
557 if (value & (1 << IRQ_KEYPAD)) {
558 GBALog(gba, GBA_LOG_STUB, "Keypad interrupts not implemented");
559 }
560
561 if (value & (1 << IRQ_GAMEPAK)) {
562 GBALog(gba, GBA_LOG_STUB, "Gamepak interrupts not implemented");
563 }
564
565 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
566 ARMRaiseIRQ(gba->cpu);
567 }
568}
569
570void GBAWriteIME(struct GBA* gba, uint16_t value) {
571 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
572 ARMRaiseIRQ(gba->cpu);
573 }
574}
575
576void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
577 gba->memory.io[REG_IF >> 1] |= 1 << irq;
578 gba->cpu->halted = 0;
579
580 if (gba->memory.io[REG_IME >> 1] && (gba->memory.io[REG_IE >> 1] & 1 << irq)) {
581 ARMRaiseIRQ(gba->cpu);
582 }
583}
584
585void GBATestIRQ(struct ARMCore* cpu) {
586 struct GBA* gba = (struct GBA*) cpu->master;
587 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
588 gba->springIRQ = 1;
589 gba->cpu->nextEvent = 0;
590 }
591}
592
593void GBAHalt(struct GBA* gba) {
594 gba->cpu->nextEvent = 0;
595 gba->cpu->halted = 1;
596}
597
598static void _GBAVLog(struct GBA* gba, enum GBALogLevel level, const char* format, va_list args) {
599 struct GBAThread* threadContext = GBAThreadGetContext();
600 if (threadContext) {
601 if (!gba) {
602 gba = threadContext->gba;
603 }
604 }
605
606 if (gba && !(level & gba->logLevel) && level != GBA_LOG_FATAL) {
607 return;
608 }
609
610 if (threadContext && threadContext->logHandler) {
611 threadContext->logHandler(threadContext, level, format, args);
612 return;
613 }
614
615 vprintf(format, args);
616 printf("\n");
617
618 if (level == GBA_LOG_FATAL) {
619 abort();
620 }
621}
622
623void GBALog(struct GBA* gba, enum GBALogLevel level, const char* format, ...) {
624 va_list args;
625 va_start(args, format);
626 _GBAVLog(gba, level, format, args);
627 va_end(args);
628}
629
630void GBADebuggerLogShim(struct ARMDebugger* debugger, enum DebuggerLogLevel level, const char* format, ...) {
631 struct GBA* gba = 0;
632 if (debugger->cpu) {
633 gba = (struct GBA*) debugger->cpu->master;
634 }
635
636 enum GBALogLevel gbaLevel;
637 switch (level) {
638 default: // Avoids compiler warning
639 case DEBUGGER_LOG_DEBUG:
640 gbaLevel = GBA_LOG_DEBUG;
641 break;
642 case DEBUGGER_LOG_INFO:
643 gbaLevel = GBA_LOG_INFO;
644 break;
645 case DEBUGGER_LOG_WARN:
646 gbaLevel = GBA_LOG_WARN;
647 break;
648 case DEBUGGER_LOG_ERROR:
649 gbaLevel = GBA_LOG_ERROR;
650 break;
651 }
652 va_list args;
653 va_start(args, format);
654 _GBAVLog(gba, gbaLevel, format, args);
655 va_end(args);
656}
657
658bool GBAIsROM(struct VFile* vf) {
659 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
660 return false;
661 }
662 uint8_t signature[sizeof(GBA_ROM_MAGIC)];
663 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
664 return false;
665 }
666 return memcmp(signature, GBA_ROM_MAGIC, sizeof(signature)) == 0;
667}
668
669void GBAGetGameCode(struct GBA* gba, char* out) {
670 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->id, 4);
671}
672
673void GBAGetGameTitle(struct GBA* gba, char* out) {
674 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
675}
676
677void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
678 struct GBA* gba = (struct GBA*) cpu->master;
679 enum GBALogLevel level = GBA_LOG_FATAL;
680 if (gba->debugger) {
681 level = GBA_LOG_STUB;
682 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP);
683 }
684 GBALog(gba, level, "Stub opcode: %08x", opcode);
685}
686
687void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
688 struct GBA* gba = (struct GBA*) cpu->master;
689 GBALog(gba, GBA_LOG_WARN, "Illegal opcode: %08x", opcode);
690 if (gba->debugger) {
691 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP);
692 }
693}
694
695void _checkOverrides(struct GBA* gba, uint32_t id) {
696 int i;
697 gba->busyLoop = -1;
698 if ((id & 0xFF) == 'F') {
699 GBALog(gba, GBA_LOG_DEBUG, "Found Classic NES Series game, using EEPROM saves");
700 GBASavedataInitEEPROM(&gba->memory.savedata);
701 return;
702 }
703 for (i = 0; _overrides[i].id[0]; ++i) {
704 const uint32_t* overrideId = (const uint32_t*) _overrides[i].id;
705 if (*overrideId == id) {
706 GBALog(gba, GBA_LOG_DEBUG, "Found override for game %s!", _overrides[i].id);
707 switch (_overrides[i].type) {
708 case SAVEDATA_FLASH512:
709 case SAVEDATA_FLASH1M:
710 gba->memory.savedata.type = _overrides[i].type;
711 GBASavedataInitFlash(&gba->memory.savedata);
712 break;
713 case SAVEDATA_EEPROM:
714 GBASavedataInitEEPROM(&gba->memory.savedata);
715 break;
716 case SAVEDATA_SRAM:
717 GBASavedataInitSRAM(&gba->memory.savedata);
718 break;
719 case SAVEDATA_NONE:
720 break;
721 }
722
723 if (_overrides[i].gpio & GPIO_RTC) {
724 GBAGPIOInitRTC(&gba->memory.gpio);
725 }
726
727 if (_overrides[i].gpio & GPIO_GYRO) {
728 GBAGPIOInitGyro(&gba->memory.gpio);
729 }
730
731 if (_overrides[i].gpio & GPIO_RUMBLE) {
732 GBAGPIOInitRumble(&gba->memory.gpio);
733 }
734
735 gba->busyLoop = _overrides[i].busyLoop;
736 return;
737 }
738 }
739}