src/gba/gba.c (view raw)
1/* Copyright (c) 2013-2015 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/supervisor/rr.h"
11#include "gba/supervisor/thread.h"
12#include "gba/serialize.h"
13#include "gba/sio.h"
14
15#include "isa-inlines.h"
16
17#include "util/crc32.h"
18#include "util/memory.h"
19#include "util/patch.h"
20#include "util/vfs.h"
21
22const uint32_t GBA_ARM7TDMI_FREQUENCY = 0x1000000;
23const uint32_t GBA_COMPONENT_MAGIC = 0x1000000;
24
25static const size_t GBA_ROM_MAGIC_OFFSET = 3;
26static const uint8_t GBA_ROM_MAGIC[] = { 0xEA };
27
28static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component);
29static void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh);
30static void GBAProcessEvents(struct ARMCore* cpu);
31static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles);
32static void GBAHitStub(struct ARMCore* cpu, uint32_t opcode);
33static void GBAIllegal(struct ARMCore* cpu, uint32_t opcode);
34static void GBABreakpoint(struct ARMCore* cpu, int immediate);
35
36static bool _setSoftwareBreakpoint(struct ARMDebugger*, uint32_t address, enum ExecutionMode mode, uint32_t* opcode);
37static bool _clearSoftwareBreakpoint(struct ARMDebugger*, uint32_t address, enum ExecutionMode mode, uint32_t opcode);
38
39void GBACreate(struct GBA* gba) {
40 gba->d.id = GBA_COMPONENT_MAGIC;
41 gba->d.init = GBAInit;
42 gba->d.deinit = 0;
43}
44
45static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component) {
46 struct GBA* gba = (struct GBA*) component;
47 gba->cpu = cpu;
48 gba->debugger = 0;
49
50 GBAInterruptHandlerInit(&cpu->irqh);
51 GBAMemoryInit(gba);
52 GBASavedataInit(&gba->memory.savedata, 0);
53
54 gba->video.p = gba;
55 GBAVideoInit(&gba->video);
56
57 gba->audio.p = gba;
58 GBAAudioInit(&gba->audio, GBA_AUDIO_SAMPLES);
59
60 GBAIOInit(gba);
61
62 gba->sio.p = gba;
63 GBASIOInit(&gba->sio);
64
65 gba->timersEnabled = 0;
66 memset(gba->timers, 0, sizeof(gba->timers));
67
68 gba->springIRQ = 0;
69 gba->keySource = 0;
70 gba->rotationSource = 0;
71 gba->luminanceSource = 0;
72 gba->rtcSource = 0;
73 gba->rumble = 0;
74 gba->rr = 0;
75
76 gba->romVf = 0;
77 gba->biosVf = 0;
78
79 gba->logLevel = GBA_LOG_INFO | GBA_LOG_WARN | GBA_LOG_ERROR | GBA_LOG_FATAL;
80
81 gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
82
83 gba->idleOptimization = IDLE_LOOP_REMOVE;
84 gba->idleLoop = IDLE_LOOP_NONE;
85 gba->lastJump = 0;
86 gba->idleDetectionStep = 0;
87 gba->idleDetectionFailures = 0;
88 gba->performingDMA = false;
89}
90
91void GBADestroy(struct GBA* gba) {
92 if (gba->pristineRom == gba->memory.rom) {
93 gba->memory.rom = 0;
94 }
95
96 if (gba->romVf) {
97 gba->romVf->unmap(gba->romVf, gba->pristineRom, gba->pristineRomSize);
98 }
99
100 if (gba->biosVf) {
101 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
102 }
103
104 GBAMemoryDeinit(gba);
105 GBAVideoDeinit(&gba->video);
106 GBAAudioDeinit(&gba->audio);
107 GBARRContextDestroy(gba);
108}
109
110void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
111 irqh->reset = GBAReset;
112 irqh->processEvents = GBAProcessEvents;
113 irqh->swi16 = GBASwi16;
114 irqh->swi32 = GBASwi32;
115 irqh->hitIllegal = GBAIllegal;
116 irqh->readCPSR = GBATestIRQ;
117 irqh->hitStub = GBAHitStub;
118 irqh->bkpt16 = GBABreakpoint;
119 irqh->bkpt32 = GBABreakpoint;
120}
121
122void GBAReset(struct ARMCore* cpu) {
123 ARMSetPrivilegeMode(cpu, MODE_IRQ);
124 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
125 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
126 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
127 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
128 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
129
130 struct GBA* gba = (struct GBA*) cpu->master;
131 if (!GBARRIsPlaying(gba->rr) && !GBARRIsRecording(gba->rr)) {
132 GBASavedataUnmask(&gba->memory.savedata);
133 }
134 GBAMemoryReset(gba);
135 GBAVideoReset(&gba->video);
136 GBAAudioReset(&gba->audio);
137 GBAIOInit(gba);
138
139 GBASIODeinit(&gba->sio);
140 GBASIOInit(&gba->sio);
141
142 gba->timersEnabled = 0;
143 memset(gba->timers, 0, sizeof(gba->timers));
144}
145
146void GBASkipBIOS(struct ARMCore* cpu) {
147 if (cpu->gprs[ARM_PC] == BASE_RESET + WORD_SIZE_ARM) {
148 cpu->gprs[ARM_PC] = BASE_CART0;
149 int currentCycles = 0;
150 ARM_WRITE_PC;
151 }
152}
153
154static void GBAProcessEvents(struct ARMCore* cpu) {
155 do {
156 struct GBA* gba = (struct GBA*) cpu->master;
157 int32_t cycles = cpu->nextEvent;
158 int32_t nextEvent = INT_MAX;
159 int32_t testEvent;
160
161 gba->bus = cpu->prefetch[1];
162 if (cpu->executionMode == MODE_THUMB) {
163 gba->bus |= cpu->prefetch[1] << 16;
164 }
165
166 if (gba->springIRQ) {
167 ARMRaiseIRQ(cpu);
168 gba->springIRQ = 0;
169 }
170
171 testEvent = GBAVideoProcessEvents(&gba->video, cycles);
172 if (testEvent < nextEvent) {
173 nextEvent = testEvent;
174 }
175
176 testEvent = GBAAudioProcessEvents(&gba->audio, cycles);
177 if (testEvent < nextEvent) {
178 nextEvent = testEvent;
179 }
180
181 testEvent = GBATimersProcessEvents(gba, cycles);
182 if (testEvent < nextEvent) {
183 nextEvent = testEvent;
184 }
185
186 testEvent = GBAMemoryRunDMAs(gba, cycles);
187 if (testEvent < nextEvent) {
188 nextEvent = testEvent;
189 }
190
191 testEvent = GBASIOProcessEvents(&gba->sio, cycles);
192 if (testEvent < nextEvent) {
193 nextEvent = testEvent;
194 }
195
196 cpu->cycles -= cycles;
197 cpu->nextEvent = nextEvent;
198
199 if (cpu->halted) {
200 cpu->cycles = cpu->nextEvent;
201 }
202 } while (cpu->cycles >= cpu->nextEvent);
203}
204
205static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
206 int32_t nextEvent = INT_MAX;
207 if (gba->timersEnabled) {
208 struct GBATimer* timer;
209 struct GBATimer* nextTimer;
210
211 timer = &gba->timers[0];
212 if (timer->enable) {
213 timer->nextEvent -= cycles;
214 timer->lastEvent -= cycles;
215 if (timer->nextEvent <= 0) {
216 timer->lastEvent = timer->nextEvent;
217 timer->nextEvent += timer->overflowInterval;
218 gba->memory.io[REG_TM0CNT_LO >> 1] = timer->reload;
219 timer->oldReload = timer->reload;
220
221 if (timer->doIrq) {
222 GBARaiseIRQ(gba, IRQ_TIMER0);
223 }
224
225 if (gba->audio.enable) {
226 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
227 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
228 }
229
230 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
231 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
232 }
233 }
234
235 nextTimer = &gba->timers[1];
236 if (nextTimer->countUp) {
237 ++gba->memory.io[REG_TM1CNT_LO >> 1];
238 if (!gba->memory.io[REG_TM1CNT_LO >> 1]) {
239 nextTimer->nextEvent = 0;
240 }
241 }
242 }
243 nextEvent = timer->nextEvent;
244 }
245
246 timer = &gba->timers[1];
247 if (timer->enable) {
248 timer->nextEvent -= cycles;
249 timer->lastEvent -= cycles;
250 if (timer->nextEvent <= 0) {
251 timer->lastEvent = timer->nextEvent;
252 timer->nextEvent += timer->overflowInterval;
253 gba->memory.io[REG_TM1CNT_LO >> 1] = timer->reload;
254 timer->oldReload = timer->reload;
255
256 if (timer->doIrq) {
257 GBARaiseIRQ(gba, IRQ_TIMER1);
258 }
259
260 if (gba->audio.enable) {
261 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
262 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
263 }
264
265 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
266 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
267 }
268 }
269
270 if (timer->countUp) {
271 timer->nextEvent = INT_MAX;
272 }
273
274 nextTimer = &gba->timers[2];
275 if (nextTimer->countUp) {
276 ++gba->memory.io[REG_TM2CNT_LO >> 1];
277 if (!gba->memory.io[REG_TM2CNT_LO >> 1]) {
278 nextTimer->nextEvent = 0;
279 }
280 }
281 }
282 if (timer->nextEvent < nextEvent) {
283 nextEvent = timer->nextEvent;
284 }
285 }
286
287 timer = &gba->timers[2];
288 if (timer->enable) {
289 timer->nextEvent -= cycles;
290 timer->lastEvent -= cycles;
291 if (timer->nextEvent <= 0) {
292 timer->lastEvent = timer->nextEvent;
293 timer->nextEvent += timer->overflowInterval;
294 gba->memory.io[REG_TM2CNT_LO >> 1] = timer->reload;
295 timer->oldReload = timer->reload;
296
297 if (timer->doIrq) {
298 GBARaiseIRQ(gba, IRQ_TIMER2);
299 }
300
301 if (timer->countUp) {
302 timer->nextEvent = INT_MAX;
303 }
304
305 nextTimer = &gba->timers[3];
306 if (nextTimer->countUp) {
307 ++gba->memory.io[REG_TM3CNT_LO >> 1];
308 if (!gba->memory.io[REG_TM3CNT_LO >> 1]) {
309 nextTimer->nextEvent = 0;
310 }
311 }
312 }
313 if (timer->nextEvent < nextEvent) {
314 nextEvent = timer->nextEvent;
315 }
316 }
317
318 timer = &gba->timers[3];
319 if (timer->enable) {
320 timer->nextEvent -= cycles;
321 timer->lastEvent -= cycles;
322 if (timer->nextEvent <= 0) {
323 timer->lastEvent = timer->nextEvent;
324 timer->nextEvent += timer->overflowInterval;
325 gba->memory.io[REG_TM3CNT_LO >> 1] = timer->reload;
326 timer->oldReload = timer->reload;
327
328 if (timer->doIrq) {
329 GBARaiseIRQ(gba, IRQ_TIMER3);
330 }
331
332 if (timer->countUp) {
333 timer->nextEvent = INT_MAX;
334 }
335 }
336 if (timer->nextEvent < nextEvent) {
337 nextEvent = timer->nextEvent;
338 }
339 }
340 }
341 return nextEvent;
342}
343
344void GBAAttachDebugger(struct GBA* gba, struct ARMDebugger* debugger) {
345 debugger->setSoftwareBreakpoint = _setSoftwareBreakpoint;
346 debugger->clearSoftwareBreakpoint = _clearSoftwareBreakpoint;
347 gba->debugger = debugger;
348 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = &debugger->d;
349 ARMHotplugAttach(gba->cpu, GBA_COMPONENT_DEBUGGER);
350}
351
352void GBADetachDebugger(struct GBA* gba) {
353 gba->debugger = 0;
354 ARMHotplugDetach(gba->cpu, GBA_COMPONENT_DEBUGGER);
355 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = 0;
356}
357
358void GBALoadROM(struct GBA* gba, struct VFile* vf, struct VFile* sav, const char* fname) {
359 gba->romVf = vf;
360 gba->pristineRomSize = vf->size(vf);
361 vf->seek(vf, 0, SEEK_SET);
362 if (gba->pristineRomSize > SIZE_CART0) {
363 gba->pristineRomSize = SIZE_CART0;
364 }
365 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
366 if (!gba->pristineRom) {
367 GBALog(gba, GBA_LOG_WARN, "Couldn't map ROM");
368 return;
369 }
370 gba->memory.rom = gba->pristineRom;
371 gba->activeFile = fname;
372 gba->memory.romSize = gba->pristineRomSize;
373 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
374 GBASavedataInit(&gba->memory.savedata, sav);
375 GBAHardwareInit(&gba->memory.hw, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
376 // TODO: error check
377}
378
379void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
380 gba->biosVf = vf;
381 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
382 if (!bios) {
383 GBALog(gba, GBA_LOG_WARN, "Couldn't map BIOS");
384 return;
385 }
386 gba->memory.bios = bios;
387 gba->memory.fullBios = 1;
388 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
389 GBALog(gba, GBA_LOG_DEBUG, "BIOS Checksum: 0x%X", checksum);
390 if (checksum == GBA_BIOS_CHECKSUM) {
391 GBALog(gba, GBA_LOG_INFO, "Official GBA BIOS detected");
392 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
393 GBALog(gba, GBA_LOG_INFO, "Official GBA (DS) BIOS detected");
394 } else {
395 GBALog(gba, GBA_LOG_WARN, "BIOS checksum incorrect");
396 }
397 gba->biosChecksum = checksum;
398 if (gba->memory.activeRegion == REGION_BIOS) {
399 gba->cpu->memory.activeRegion = gba->memory.bios;
400 }
401 // TODO: error check
402}
403
404void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
405 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
406 if (!patchedSize) {
407 return;
408 }
409 gba->memory.rom = anonymousMemoryMap(patchedSize);
410 if (!patch->applyPatch(patch, gba->pristineRom, gba->pristineRomSize, gba->memory.rom, patchedSize)) {
411 mappedMemoryFree(gba->memory.rom, patchedSize);
412 gba->memory.rom = gba->pristineRom;
413 return;
414 }
415 gba->memory.romSize = patchedSize;
416 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
417}
418
419void GBATimerUpdateRegister(struct GBA* gba, int timer) {
420 struct GBATimer* currentTimer = &gba->timers[timer];
421 if (currentTimer->enable && !currentTimer->countUp) {
422 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> currentTimer->prescaleBits);
423 }
424}
425
426void GBATimerWriteTMCNT_LO(struct GBA* gba, int timer, uint16_t reload) {
427 gba->timers[timer].reload = reload;
428}
429
430void GBATimerWriteTMCNT_HI(struct GBA* gba, int timer, uint16_t control) {
431 struct GBATimer* currentTimer = &gba->timers[timer];
432 GBATimerUpdateRegister(gba, timer);
433
434 int oldPrescale = currentTimer->prescaleBits;
435 switch (control & 0x0003) {
436 case 0x0000:
437 currentTimer->prescaleBits = 0;
438 break;
439 case 0x0001:
440 currentTimer->prescaleBits = 6;
441 break;
442 case 0x0002:
443 currentTimer->prescaleBits = 8;
444 break;
445 case 0x0003:
446 currentTimer->prescaleBits = 10;
447 break;
448 }
449 currentTimer->countUp = !!(control & 0x0004);
450 currentTimer->doIrq = !!(control & 0x0040);
451 currentTimer->overflowInterval = (0x10000 - currentTimer->reload) << currentTimer->prescaleBits;
452 int wasEnabled = currentTimer->enable;
453 currentTimer->enable = !!(control & 0x0080);
454 if (!wasEnabled && currentTimer->enable) {
455 if (!currentTimer->countUp) {
456 currentTimer->nextEvent = gba->cpu->cycles + currentTimer->overflowInterval;
457 } else {
458 currentTimer->nextEvent = INT_MAX;
459 }
460 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->reload;
461 currentTimer->oldReload = currentTimer->reload;
462 currentTimer->lastEvent = 0;
463 gba->timersEnabled |= 1 << timer;
464 } else if (wasEnabled && !currentTimer->enable) {
465 if (!currentTimer->countUp) {
466 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> oldPrescale);
467 }
468 gba->timersEnabled &= ~(1 << timer);
469 } else if (currentTimer->prescaleBits != oldPrescale && !currentTimer->countUp) {
470 // FIXME: this might be before present
471 currentTimer->nextEvent = currentTimer->lastEvent + currentTimer->overflowInterval;
472 }
473
474 if (currentTimer->nextEvent < gba->cpu->nextEvent) {
475 gba->cpu->nextEvent = currentTimer->nextEvent;
476 }
477};
478
479void GBAWriteIE(struct GBA* gba, uint16_t value) {
480 if (value & (1 << IRQ_KEYPAD)) {
481 GBALog(gba, GBA_LOG_STUB, "Keypad interrupts not implemented");
482 }
483
484 if (value & (1 << IRQ_GAMEPAK)) {
485 GBALog(gba, GBA_LOG_STUB, "Gamepak interrupts not implemented");
486 }
487
488 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
489 ARMRaiseIRQ(gba->cpu);
490 }
491}
492
493void GBAWriteIME(struct GBA* gba, uint16_t value) {
494 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
495 ARMRaiseIRQ(gba->cpu);
496 }
497}
498
499void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
500 gba->memory.io[REG_IF >> 1] |= 1 << irq;
501 gba->cpu->halted = 0;
502
503 if (gba->memory.io[REG_IME >> 1] && (gba->memory.io[REG_IE >> 1] & 1 << irq)) {
504 ARMRaiseIRQ(gba->cpu);
505 }
506}
507
508void GBATestIRQ(struct ARMCore* cpu) {
509 struct GBA* gba = (struct GBA*) cpu->master;
510 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
511 gba->springIRQ = 1;
512 gba->cpu->nextEvent = 0;
513 }
514}
515
516void GBAHalt(struct GBA* gba) {
517 gba->cpu->nextEvent = 0;
518 gba->cpu->halted = 1;
519}
520
521static void _GBAVLog(struct GBA* gba, enum GBALogLevel level, const char* format, va_list args) {
522 struct GBAThread* threadContext = GBAThreadGetContext();
523 enum GBALogLevel logLevel = -1;
524
525 if (gba) {
526 logLevel = gba->logLevel;
527 }
528
529 if (threadContext) {
530 logLevel = threadContext->logLevel;
531 gba = threadContext->gba;
532 }
533
534 if (!(level & logLevel) && level != GBA_LOG_FATAL) {
535 return;
536 }
537
538 if (level == GBA_LOG_FATAL && gba) {
539 gba->cpu->nextEvent = 0;
540 }
541
542 if (threadContext) {
543 if (level == GBA_LOG_FATAL) {
544 MutexLock(&threadContext->stateMutex);
545 threadContext->state = THREAD_CRASHED;
546 MutexUnlock(&threadContext->stateMutex);
547 }
548 if (threadContext->logHandler) {
549 threadContext->logHandler(threadContext, level, format, args);
550 return;
551 }
552 }
553
554 vprintf(format, args);
555 printf("\n");
556
557 if (level == GBA_LOG_FATAL && !threadContext) {
558 abort();
559 }
560}
561
562void GBALog(struct GBA* gba, enum GBALogLevel level, const char* format, ...) {
563 va_list args;
564 va_start(args, format);
565 _GBAVLog(gba, level, format, args);
566 va_end(args);
567}
568
569void GBADebuggerLogShim(struct ARMDebugger* debugger, enum DebuggerLogLevel level, const char* format, ...) {
570 struct GBA* gba = 0;
571 if (debugger->cpu) {
572 gba = (struct GBA*) debugger->cpu->master;
573 }
574
575 enum GBALogLevel gbaLevel;
576 switch (level) {
577 default: // Avoids compiler warning
578 case DEBUGGER_LOG_DEBUG:
579 gbaLevel = GBA_LOG_DEBUG;
580 break;
581 case DEBUGGER_LOG_INFO:
582 gbaLevel = GBA_LOG_INFO;
583 break;
584 case DEBUGGER_LOG_WARN:
585 gbaLevel = GBA_LOG_WARN;
586 break;
587 case DEBUGGER_LOG_ERROR:
588 gbaLevel = GBA_LOG_ERROR;
589 break;
590 }
591 va_list args;
592 va_start(args, format);
593 _GBAVLog(gba, gbaLevel, format, args);
594 va_end(args);
595}
596
597bool GBAIsROM(struct VFile* vf) {
598 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
599 return false;
600 }
601 uint8_t signature[sizeof(GBA_ROM_MAGIC)];
602 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
603 return false;
604 }
605 return memcmp(signature, GBA_ROM_MAGIC, sizeof(signature)) == 0;
606}
607
608bool GBAIsBIOS(struct VFile* vf) {
609 if (vf->seek(vf, 0, SEEK_SET) < 0) {
610 return false;
611 }
612 uint32_t interruptTable[7];
613 if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
614 return false;
615 }
616 int i;
617 for (i = 0; i < 7; ++i) {
618 if ((interruptTable[i] & 0xFFFF0000) != 0xEA000000) {
619 return false;
620 }
621 }
622 return true;
623}
624
625void GBAGetGameCode(struct GBA* gba, char* out) {
626 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->id, 4);
627}
628
629void GBAGetGameTitle(struct GBA* gba, char* out) {
630 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
631}
632
633void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
634 struct GBA* gba = (struct GBA*) cpu->master;
635 enum GBALogLevel level = GBA_LOG_FATAL;
636 if (gba->debugger) {
637 level = GBA_LOG_STUB;
638 struct DebuggerEntryInfo info = {
639 .address = _ARMPCAddress(cpu),
640 .opcode = opcode
641 };
642 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP, &info);
643 }
644 GBALog(gba, level, "Stub opcode: %08x", opcode);
645}
646
647void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
648 struct GBA* gba = (struct GBA*) cpu->master;
649 GBALog(gba, GBA_LOG_WARN, "Illegal opcode: %08x", opcode);
650 if (gba->debugger) {
651 struct DebuggerEntryInfo info = {
652 .address = _ARMPCAddress(cpu),
653 .opcode = opcode
654 };
655 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP, &info);
656 }
657}
658
659void GBABreakpoint(struct ARMCore* cpu, int immediate) {
660 struct GBA* gba = (struct GBA*) cpu->master;
661 if (immediate >= GBA_COMPONENT_MAX) {
662 return;
663 }
664 switch (immediate) {
665 case GBA_COMPONENT_DEBUGGER:
666 if (gba->debugger) {
667 struct DebuggerEntryInfo info = {
668 .address = _ARMPCAddress(cpu)
669 };
670 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_BREAKPOINT, &info);
671 }
672 break;
673 default:
674 break;
675 }
676}
677
678void GBAFrameStarted(struct GBA* gba) {
679 UNUSED(gba);
680
681 struct GBAThread* thread = GBAThreadGetContext();
682 if (!thread) {
683 return;
684 }
685
686 if (thread->rewindBuffer) {
687 --thread->rewindBufferNext;
688 if (thread->rewindBufferNext <= 0) {
689 thread->rewindBufferNext = thread->rewindBufferInterval;
690 GBARecordFrame(thread);
691 }
692 }
693}
694
695void GBAFrameEnded(struct GBA* gba) {
696 if (gba->rr) {
697 GBARRNextFrame(gba->rr);
698 }
699
700 struct GBAThread* thread = GBAThreadGetContext();
701 if (!thread) {
702 return;
703 }
704
705 if (thread->stream) {
706 thread->stream->postVideoFrame(thread->stream, thread->renderer);
707 }
708
709 if (thread->frameCallback) {
710 thread->frameCallback(thread);
711 }
712}
713
714static bool _setSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
715 int immediate = GBA_COMPONENT_DEBUGGER;
716 if (mode == MODE_ARM) {
717 int32_t value;
718 int32_t old;
719 value = 0xE1200070;
720 value |= immediate & 0xF;
721 value |= (immediate & 0xFFF0) << 4;
722 GBAPatch32(debugger->cpu, address, value, &old);
723 *opcode = old;
724 } else {
725 int16_t value;
726 int16_t old;
727 value = 0xBE00;
728 value |= immediate & 0xFF;
729 GBAPatch16(debugger->cpu, address, value, &old);
730 *opcode = old;
731 }
732 return true;
733}
734
735static bool _clearSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
736 if (mode == MODE_ARM) {
737 GBAPatch32(debugger->cpu, address, opcode, 0);
738 } else {
739 GBAPatch16(debugger->cpu, address, opcode, 0);
740 }
741 return true;
742}