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/cheats.h"
10#include "gba/io.h"
11#include "gba/supervisor/rr.h"
12#include "gba/supervisor/thread.h"
13#include "gba/serialize.h"
14#include "gba/sio.h"
15
16#include "isa-inlines.h"
17
18#include "util/crc32.h"
19#include "util/memory.h"
20#include "util/patch.h"
21#include "util/vfs.h"
22
23const uint32_t GBA_ARM7TDMI_FREQUENCY = 0x1000000;
24const uint32_t GBA_COMPONENT_MAGIC = 0x1000000;
25
26static const size_t GBA_ROM_MAGIC_OFFSET = 3;
27static const uint8_t GBA_ROM_MAGIC[] = { 0xEA };
28
29static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component);
30static void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh);
31static void GBAProcessEvents(struct ARMCore* cpu);
32static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles);
33static void GBAHitStub(struct ARMCore* cpu, uint32_t opcode);
34static void GBAIllegal(struct ARMCore* cpu, uint32_t opcode);
35static void GBABreakpoint(struct ARMCore* cpu, int immediate);
36
37static bool _setSoftwareBreakpoint(struct ARMDebugger*, uint32_t address, enum ExecutionMode mode, uint32_t* opcode);
38static bool _clearSoftwareBreakpoint(struct ARMDebugger*, uint32_t address, enum ExecutionMode mode, uint32_t opcode);
39
40void GBACreate(struct GBA* gba) {
41 gba->d.id = GBA_COMPONENT_MAGIC;
42 gba->d.init = GBAInit;
43 gba->d.deinit = 0;
44}
45
46static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component) {
47 struct GBA* gba = (struct GBA*) component;
48 gba->cpu = cpu;
49 gba->debugger = 0;
50 gba->sync = 0;
51
52 GBAInterruptHandlerInit(&cpu->irqh);
53 GBAMemoryInit(gba);
54 GBASavedataInit(&gba->memory.savedata, 0);
55
56 gba->video.p = gba;
57 GBAVideoInit(&gba->video);
58
59 gba->audio.p = gba;
60 GBAAudioInit(&gba->audio, GBA_AUDIO_SAMPLES);
61
62 GBAIOInit(gba);
63
64 gba->sio.p = gba;
65 GBASIOInit(&gba->sio);
66
67 gba->timersEnabled = 0;
68 memset(gba->timers, 0, sizeof(gba->timers));
69
70 gba->springIRQ = 0;
71 gba->keySource = 0;
72 gba->rotationSource = 0;
73 gba->luminanceSource = 0;
74 gba->rtcSource = 0;
75 gba->rumble = 0;
76 gba->rr = 0;
77
78 gba->romVf = 0;
79 gba->biosVf = 0;
80
81 gba->logHandler = 0;
82 gba->logLevel = GBA_LOG_INFO | GBA_LOG_WARN | GBA_LOG_ERROR | GBA_LOG_FATAL;
83 gba->stream = 0;
84
85 gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
86
87 gba->idleOptimization = IDLE_LOOP_REMOVE;
88 gba->idleLoop = IDLE_LOOP_NONE;
89 gba->lastJump = 0;
90 gba->idleDetectionStep = 0;
91 gba->idleDetectionFailures = 0;
92 gba->performingDMA = false;
93}
94
95void GBADestroy(struct GBA* gba) {
96 if (gba->pristineRom == gba->memory.rom) {
97 gba->memory.rom = 0;
98 }
99
100 if (gba->romVf) {
101 gba->romVf->unmap(gba->romVf, gba->pristineRom, gba->pristineRomSize);
102 }
103
104 if (gba->biosVf) {
105 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
106 }
107
108 GBAMemoryDeinit(gba);
109 GBAVideoDeinit(&gba->video);
110 GBAAudioDeinit(&gba->audio);
111 GBASIODeinit(&gba->sio);
112 gba->rr = 0;
113}
114
115void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
116 irqh->reset = GBAReset;
117 irqh->processEvents = GBAProcessEvents;
118 irqh->swi16 = GBASwi16;
119 irqh->swi32 = GBASwi32;
120 irqh->hitIllegal = GBAIllegal;
121 irqh->readCPSR = GBATestIRQ;
122 irqh->hitStub = GBAHitStub;
123 irqh->bkpt16 = GBABreakpoint;
124 irqh->bkpt32 = GBABreakpoint;
125}
126
127void GBAReset(struct ARMCore* cpu) {
128 ARMSetPrivilegeMode(cpu, MODE_IRQ);
129 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
130 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
131 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
132 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
133 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
134
135 struct GBA* gba = (struct GBA*) cpu->master;
136 if (!gba->rr || (!gba->rr->isPlaying(gba->rr) && !gba->rr->isRecording(gba->rr))) {
137 GBASavedataUnmask(&gba->memory.savedata);
138 }
139 GBAMemoryReset(gba);
140 GBAVideoReset(&gba->video);
141 GBAAudioReset(&gba->audio);
142 GBAIOInit(gba);
143
144 GBASIODeinit(&gba->sio);
145 GBASIOInit(&gba->sio);
146
147 gba->timersEnabled = 0;
148 memset(gba->timers, 0, sizeof(gba->timers));
149}
150
151void GBASkipBIOS(struct ARMCore* cpu) {
152 if (cpu->gprs[ARM_PC] == BASE_RESET + WORD_SIZE_ARM) {
153 cpu->gprs[ARM_PC] = BASE_CART0;
154 int currentCycles = 0;
155 ARM_WRITE_PC;
156 }
157}
158
159static void GBAProcessEvents(struct ARMCore* cpu) {
160 do {
161 struct GBA* gba = (struct GBA*) cpu->master;
162 int32_t cycles = cpu->nextEvent;
163 int32_t nextEvent = INT_MAX;
164 int32_t testEvent;
165
166 gba->bus = cpu->prefetch[1];
167 if (cpu->executionMode == MODE_THUMB) {
168 gba->bus |= cpu->prefetch[1] << 16;
169 }
170
171 if (gba->springIRQ) {
172 ARMRaiseIRQ(cpu);
173 gba->springIRQ = 0;
174 }
175
176 testEvent = GBAVideoProcessEvents(&gba->video, cycles);
177 if (testEvent < nextEvent) {
178 nextEvent = testEvent;
179 }
180
181 testEvent = GBAAudioProcessEvents(&gba->audio, cycles);
182 if (testEvent < nextEvent) {
183 nextEvent = testEvent;
184 }
185
186 testEvent = GBATimersProcessEvents(gba, cycles);
187 if (testEvent < nextEvent) {
188 nextEvent = testEvent;
189 }
190
191 testEvent = GBAMemoryRunDMAs(gba, cycles);
192 if (testEvent < nextEvent) {
193 nextEvent = testEvent;
194 }
195
196 testEvent = GBASIOProcessEvents(&gba->sio, cycles);
197 if (testEvent < nextEvent) {
198 nextEvent = testEvent;
199 }
200
201 cpu->cycles -= cycles;
202 cpu->nextEvent = nextEvent;
203
204 if (cpu->halted) {
205 cpu->cycles = cpu->nextEvent;
206 }
207 } while (cpu->cycles >= cpu->nextEvent);
208}
209
210static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
211 int32_t nextEvent = INT_MAX;
212 if (gba->timersEnabled) {
213 struct GBATimer* timer;
214 struct GBATimer* nextTimer;
215
216 timer = &gba->timers[0];
217 if (timer->enable) {
218 timer->nextEvent -= cycles;
219 timer->lastEvent -= cycles;
220 if (timer->nextEvent <= 0) {
221 timer->lastEvent = timer->nextEvent;
222 timer->nextEvent += timer->overflowInterval;
223 gba->memory.io[REG_TM0CNT_LO >> 1] = timer->reload;
224 timer->oldReload = timer->reload;
225
226 if (timer->doIrq) {
227 GBARaiseIRQ(gba, IRQ_TIMER0);
228 }
229
230 if (gba->audio.enable) {
231 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
232 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
233 }
234
235 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
236 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
237 }
238 }
239
240 nextTimer = &gba->timers[1];
241 if (nextTimer->countUp) {
242 ++gba->memory.io[REG_TM1CNT_LO >> 1];
243 if (!gba->memory.io[REG_TM1CNT_LO >> 1]) {
244 nextTimer->nextEvent = 0;
245 }
246 }
247 }
248 nextEvent = timer->nextEvent;
249 }
250
251 timer = &gba->timers[1];
252 if (timer->enable) {
253 timer->nextEvent -= cycles;
254 timer->lastEvent -= cycles;
255 if (timer->nextEvent <= 0) {
256 timer->lastEvent = timer->nextEvent;
257 timer->nextEvent += timer->overflowInterval;
258 gba->memory.io[REG_TM1CNT_LO >> 1] = timer->reload;
259 timer->oldReload = timer->reload;
260
261 if (timer->doIrq) {
262 GBARaiseIRQ(gba, IRQ_TIMER1);
263 }
264
265 if (gba->audio.enable) {
266 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
267 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
268 }
269
270 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
271 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
272 }
273 }
274
275 if (timer->countUp) {
276 timer->nextEvent = INT_MAX;
277 }
278
279 nextTimer = &gba->timers[2];
280 if (nextTimer->countUp) {
281 ++gba->memory.io[REG_TM2CNT_LO >> 1];
282 if (!gba->memory.io[REG_TM2CNT_LO >> 1]) {
283 nextTimer->nextEvent = 0;
284 }
285 }
286 }
287 if (timer->nextEvent < nextEvent) {
288 nextEvent = timer->nextEvent;
289 }
290 }
291
292 timer = &gba->timers[2];
293 if (timer->enable) {
294 timer->nextEvent -= cycles;
295 timer->lastEvent -= cycles;
296 if (timer->nextEvent <= 0) {
297 timer->lastEvent = timer->nextEvent;
298 timer->nextEvent += timer->overflowInterval;
299 gba->memory.io[REG_TM2CNT_LO >> 1] = timer->reload;
300 timer->oldReload = timer->reload;
301
302 if (timer->doIrq) {
303 GBARaiseIRQ(gba, IRQ_TIMER2);
304 }
305
306 if (timer->countUp) {
307 timer->nextEvent = INT_MAX;
308 }
309
310 nextTimer = &gba->timers[3];
311 if (nextTimer->countUp) {
312 ++gba->memory.io[REG_TM3CNT_LO >> 1];
313 if (!gba->memory.io[REG_TM3CNT_LO >> 1]) {
314 nextTimer->nextEvent = 0;
315 }
316 }
317 }
318 if (timer->nextEvent < nextEvent) {
319 nextEvent = timer->nextEvent;
320 }
321 }
322
323 timer = &gba->timers[3];
324 if (timer->enable) {
325 timer->nextEvent -= cycles;
326 timer->lastEvent -= cycles;
327 if (timer->nextEvent <= 0) {
328 timer->lastEvent = timer->nextEvent;
329 timer->nextEvent += timer->overflowInterval;
330 gba->memory.io[REG_TM3CNT_LO >> 1] = timer->reload;
331 timer->oldReload = timer->reload;
332
333 if (timer->doIrq) {
334 GBARaiseIRQ(gba, IRQ_TIMER3);
335 }
336
337 if (timer->countUp) {
338 timer->nextEvent = INT_MAX;
339 }
340 }
341 if (timer->nextEvent < nextEvent) {
342 nextEvent = timer->nextEvent;
343 }
344 }
345 }
346 return nextEvent;
347}
348
349void GBAAttachDebugger(struct GBA* gba, struct ARMDebugger* debugger) {
350 debugger->setSoftwareBreakpoint = _setSoftwareBreakpoint;
351 debugger->clearSoftwareBreakpoint = _clearSoftwareBreakpoint;
352 gba->debugger = debugger;
353 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = &debugger->d;
354 ARMHotplugAttach(gba->cpu, GBA_COMPONENT_DEBUGGER);
355}
356
357void GBADetachDebugger(struct GBA* gba) {
358 gba->debugger = 0;
359 ARMHotplugDetach(gba->cpu, GBA_COMPONENT_DEBUGGER);
360 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = 0;
361}
362
363void GBALoadROM(struct GBA* gba, struct VFile* vf, struct VFile* sav, const char* fname) {
364 gba->romVf = vf;
365 gba->pristineRomSize = vf->size(vf);
366 vf->seek(vf, 0, SEEK_SET);
367 if (gba->pristineRomSize > SIZE_CART0) {
368 gba->pristineRomSize = SIZE_CART0;
369 }
370 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
371 if (!gba->pristineRom) {
372 GBALog(gba, GBA_LOG_WARN, "Couldn't map ROM");
373 return;
374 }
375 gba->memory.rom = gba->pristineRom;
376 gba->activeFile = fname;
377 gba->memory.romSize = gba->pristineRomSize;
378 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
379 GBASavedataInit(&gba->memory.savedata, sav);
380 GBAHardwareInit(&gba->memory.hw, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
381 // TODO: error check
382}
383
384void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
385 gba->biosVf = vf;
386 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
387 if (!bios) {
388 GBALog(gba, GBA_LOG_WARN, "Couldn't map BIOS");
389 return;
390 }
391 gba->memory.bios = bios;
392 gba->memory.fullBios = 1;
393 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
394 GBALog(gba, GBA_LOG_DEBUG, "BIOS Checksum: 0x%X", checksum);
395 if (checksum == GBA_BIOS_CHECKSUM) {
396 GBALog(gba, GBA_LOG_INFO, "Official GBA BIOS detected");
397 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
398 GBALog(gba, GBA_LOG_INFO, "Official GBA (DS) BIOS detected");
399 } else {
400 GBALog(gba, GBA_LOG_WARN, "BIOS checksum incorrect");
401 }
402 gba->biosChecksum = checksum;
403 if (gba->memory.activeRegion == REGION_BIOS) {
404 gba->cpu->memory.activeRegion = gba->memory.bios;
405 }
406 // TODO: error check
407}
408
409void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
410 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
411 if (!patchedSize) {
412 return;
413 }
414 gba->memory.rom = anonymousMemoryMap(patchedSize);
415 if (!patch->applyPatch(patch, gba->pristineRom, gba->pristineRomSize, gba->memory.rom, patchedSize)) {
416 mappedMemoryFree(gba->memory.rom, patchedSize);
417 gba->memory.rom = gba->pristineRom;
418 return;
419 }
420 gba->memory.romSize = patchedSize;
421 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
422}
423
424void GBATimerUpdateRegister(struct GBA* gba, int timer) {
425 struct GBATimer* currentTimer = &gba->timers[timer];
426 if (currentTimer->enable && !currentTimer->countUp) {
427 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> currentTimer->prescaleBits);
428 }
429}
430
431void GBATimerWriteTMCNT_LO(struct GBA* gba, int timer, uint16_t reload) {
432 gba->timers[timer].reload = reload;
433}
434
435void GBATimerWriteTMCNT_HI(struct GBA* gba, int timer, uint16_t control) {
436 struct GBATimer* currentTimer = &gba->timers[timer];
437 GBATimerUpdateRegister(gba, timer);
438
439 int oldPrescale = currentTimer->prescaleBits;
440 switch (control & 0x0003) {
441 case 0x0000:
442 currentTimer->prescaleBits = 0;
443 break;
444 case 0x0001:
445 currentTimer->prescaleBits = 6;
446 break;
447 case 0x0002:
448 currentTimer->prescaleBits = 8;
449 break;
450 case 0x0003:
451 currentTimer->prescaleBits = 10;
452 break;
453 }
454 currentTimer->countUp = !!(control & 0x0004);
455 currentTimer->doIrq = !!(control & 0x0040);
456 currentTimer->overflowInterval = (0x10000 - currentTimer->reload) << currentTimer->prescaleBits;
457 int wasEnabled = currentTimer->enable;
458 currentTimer->enable = !!(control & 0x0080);
459 if (!wasEnabled && currentTimer->enable) {
460 if (!currentTimer->countUp) {
461 currentTimer->nextEvent = gba->cpu->cycles + currentTimer->overflowInterval;
462 } else {
463 currentTimer->nextEvent = INT_MAX;
464 }
465 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->reload;
466 currentTimer->oldReload = currentTimer->reload;
467 currentTimer->lastEvent = 0;
468 gba->timersEnabled |= 1 << timer;
469 } else if (wasEnabled && !currentTimer->enable) {
470 if (!currentTimer->countUp) {
471 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> oldPrescale);
472 }
473 gba->timersEnabled &= ~(1 << timer);
474 } else if (currentTimer->prescaleBits != oldPrescale && !currentTimer->countUp) {
475 // FIXME: this might be before present
476 currentTimer->nextEvent = currentTimer->lastEvent + currentTimer->overflowInterval;
477 }
478
479 if (currentTimer->nextEvent < gba->cpu->nextEvent) {
480 gba->cpu->nextEvent = currentTimer->nextEvent;
481 }
482};
483
484void GBAWriteIE(struct GBA* gba, uint16_t value) {
485 if (value & (1 << IRQ_KEYPAD)) {
486 GBALog(gba, GBA_LOG_STUB, "Keypad interrupts not implemented");
487 }
488
489 if (value & (1 << IRQ_GAMEPAK)) {
490 GBALog(gba, GBA_LOG_STUB, "Gamepak interrupts not implemented");
491 }
492
493 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
494 ARMRaiseIRQ(gba->cpu);
495 }
496}
497
498void GBAWriteIME(struct GBA* gba, uint16_t value) {
499 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
500 ARMRaiseIRQ(gba->cpu);
501 }
502}
503
504void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
505 gba->memory.io[REG_IF >> 1] |= 1 << irq;
506 gba->cpu->halted = 0;
507
508 if (gba->memory.io[REG_IME >> 1] && (gba->memory.io[REG_IE >> 1] & 1 << irq)) {
509 ARMRaiseIRQ(gba->cpu);
510 }
511}
512
513void GBATestIRQ(struct ARMCore* cpu) {
514 struct GBA* gba = (struct GBA*) cpu->master;
515 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
516 gba->springIRQ = 1;
517 gba->cpu->nextEvent = 0;
518 }
519}
520
521void GBAHalt(struct GBA* gba) {
522 gba->cpu->nextEvent = 0;
523 gba->cpu->halted = 1;
524}
525
526static void _GBAVLog(struct GBA* gba, enum GBALogLevel level, const char* format, va_list args) {
527 struct GBAThread* threadContext = GBAThreadGetContext();
528 enum GBALogLevel logLevel = -1;
529
530 if (gba) {
531 logLevel = gba->logLevel;
532 }
533
534 if (threadContext) {
535 logLevel = threadContext->logLevel;
536 gba = threadContext->gba;
537 }
538
539 if (!(level & logLevel) && level != GBA_LOG_FATAL) {
540 return;
541 }
542
543 if (level == GBA_LOG_FATAL && gba) {
544 gba->cpu->nextEvent = 0;
545 }
546
547 if (threadContext) {
548 if (level == GBA_LOG_FATAL) {
549 MutexLock(&threadContext->stateMutex);
550 threadContext->state = THREAD_CRASHED;
551 MutexUnlock(&threadContext->stateMutex);
552 }
553 }
554 if (gba && gba->logHandler) {
555 gba->logHandler(threadContext, level, format, args);
556 return;
557 }
558
559 vprintf(format, args);
560 printf("\n");
561
562 if (level == GBA_LOG_FATAL && !threadContext) {
563 abort();
564 }
565}
566
567void GBALog(struct GBA* gba, enum GBALogLevel level, const char* format, ...) {
568 va_list args;
569 va_start(args, format);
570 _GBAVLog(gba, level, format, args);
571 va_end(args);
572}
573
574void GBADebuggerLogShim(struct ARMDebugger* debugger, enum DebuggerLogLevel level, const char* format, ...) {
575 struct GBA* gba = 0;
576 if (debugger->cpu) {
577 gba = (struct GBA*) debugger->cpu->master;
578 }
579
580 enum GBALogLevel gbaLevel;
581 switch (level) {
582 default: // Avoids compiler warning
583 case DEBUGGER_LOG_DEBUG:
584 gbaLevel = GBA_LOG_DEBUG;
585 break;
586 case DEBUGGER_LOG_INFO:
587 gbaLevel = GBA_LOG_INFO;
588 break;
589 case DEBUGGER_LOG_WARN:
590 gbaLevel = GBA_LOG_WARN;
591 break;
592 case DEBUGGER_LOG_ERROR:
593 gbaLevel = GBA_LOG_ERROR;
594 break;
595 }
596 va_list args;
597 va_start(args, format);
598 _GBAVLog(gba, gbaLevel, format, args);
599 va_end(args);
600}
601
602bool GBAIsROM(struct VFile* vf) {
603 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
604 return false;
605 }
606 uint8_t signature[sizeof(GBA_ROM_MAGIC)];
607 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
608 return false;
609 }
610 return memcmp(signature, GBA_ROM_MAGIC, sizeof(signature)) == 0;
611}
612
613bool GBAIsBIOS(struct VFile* vf) {
614 if (vf->seek(vf, 0, SEEK_SET) < 0) {
615 return false;
616 }
617 uint32_t interruptTable[7];
618 if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
619 return false;
620 }
621 int i;
622 for (i = 0; i < 7; ++i) {
623 if ((interruptTable[i] & 0xFFFF0000) != 0xEA000000) {
624 return false;
625 }
626 }
627 return true;
628}
629
630void GBAGetGameCode(struct GBA* gba, char* out) {
631 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->id, 4);
632}
633
634void GBAGetGameTitle(struct GBA* gba, char* out) {
635 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
636}
637
638void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
639 struct GBA* gba = (struct GBA*) cpu->master;
640 enum GBALogLevel level = GBA_LOG_FATAL;
641 if (gba->debugger) {
642 level = GBA_LOG_STUB;
643 struct DebuggerEntryInfo info = {
644 .address = _ARMPCAddress(cpu),
645 .opcode = opcode
646 };
647 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP, &info);
648 }
649 GBALog(gba, level, "Stub opcode: %08x", opcode);
650}
651
652void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
653 struct GBA* gba = (struct GBA*) cpu->master;
654 GBALog(gba, GBA_LOG_WARN, "Illegal opcode: %08x", opcode);
655 if (gba->debugger) {
656 struct DebuggerEntryInfo info = {
657 .address = _ARMPCAddress(cpu),
658 .opcode = opcode
659 };
660 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP, &info);
661 }
662}
663
664void GBABreakpoint(struct ARMCore* cpu, int immediate) {
665 struct GBA* gba = (struct GBA*) cpu->master;
666 if (immediate >= GBA_COMPONENT_MAX) {
667 return;
668 }
669 switch (immediate) {
670 case GBA_COMPONENT_DEBUGGER:
671 if (gba->debugger) {
672 struct DebuggerEntryInfo info = {
673 .address = _ARMPCAddress(cpu)
674 };
675 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_BREAKPOINT, &info);
676 }
677 break;
678 case GBA_COMPONENT_CHEAT_DEVICE:
679 if (gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE]) {
680 struct GBACheatDevice* device = (struct GBACheatDevice*) gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE];
681 struct GBACheatHook* hook = 0;
682 size_t i;
683 for (i = 0; i < GBACheatSetsSize(&device->cheats); ++i) {
684 struct GBACheatSet* cheats = *GBACheatSetsGetPointer(&device->cheats, i);
685 if (cheats->hook && cheats->hook->address == _ARMPCAddress(cpu)) {
686 GBACheatRefresh(device, cheats);
687 hook = cheats->hook;
688 }
689 }
690 if (hook) {
691 ARMRunFake(cpu, hook->patchedOpcode);
692 }
693 }
694 break;
695 default:
696 break;
697 }
698}
699
700void GBAFrameStarted(struct GBA* gba) {
701 UNUSED(gba);
702
703 struct GBAThread* thread = GBAThreadGetContext();
704 if (!thread) {
705 return;
706 }
707
708 if (thread->rewindBuffer) {
709 --thread->rewindBufferNext;
710 if (thread->rewindBufferNext <= 0) {
711 thread->rewindBufferNext = thread->rewindBufferInterval;
712 GBARecordFrame(thread);
713 }
714 }
715}
716
717void GBAFrameEnded(struct GBA* gba) {
718 if (gba->rr) {
719 gba->rr->nextFrame(gba->rr);
720 }
721
722 if (gba->cpu->components && gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE]) {
723 struct GBACheatDevice* device = (struct GBACheatDevice*) gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE];
724 size_t i;
725 for (i = 0; i < GBACheatSetsSize(&device->cheats); ++i) {
726 struct GBACheatSet* cheats = *GBACheatSetsGetPointer(&device->cheats, i);
727 if (!cheats->hook) {
728 GBACheatRefresh(device, cheats);
729 }
730 }
731 }
732
733
734 struct GBAThread* thread = GBAThreadGetContext();
735 if (!thread) {
736 return;
737 }
738
739 if (gba->stream) {
740 gba->stream->postVideoFrame(gba->stream, gba->video.renderer);
741 }
742
743 if (thread->frameCallback) {
744 thread->frameCallback(thread);
745 }
746}
747
748void GBASetBreakpoint(struct GBA* gba, struct ARMComponent* component, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
749 size_t immediate;
750 for (immediate = 0; immediate < gba->cpu->numComponents; ++immediate) {
751 if (gba->cpu->components[immediate] == component) {
752 break;
753 }
754 }
755 if (immediate == gba->cpu->numComponents) {
756 return;
757 }
758 if (mode == MODE_ARM) {
759 int32_t value;
760 int32_t old;
761 value = 0xE1200070;
762 value |= immediate & 0xF;
763 value |= (immediate & 0xFFF0) << 4;
764 GBAPatch32(gba->cpu, address, value, &old);
765 *opcode = old;
766 } else {
767 int16_t value;
768 int16_t old;
769 value = 0xBE00;
770 value |= immediate & 0xFF;
771 GBAPatch16(gba->cpu, address, value, &old);
772 *opcode = (uint16_t) old;
773 }
774}
775
776void GBAClearBreakpoint(struct GBA* gba, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
777 if (mode == MODE_ARM) {
778 GBAPatch32(gba->cpu, address, opcode, 0);
779 } else {
780 GBAPatch16(gba->cpu, address, opcode, 0);
781 }
782}
783
784static bool _setSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
785 GBASetBreakpoint((struct GBA*) debugger->cpu->master, &debugger->d, address, mode, opcode);
786 return true;
787}
788
789static bool _clearSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
790 GBAClearBreakpoint((struct GBA*) debugger->cpu->master, address, mode, opcode);
791 return true;
792}