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_WARN | GBA_LOG_ERROR | GBA_LOG_FATAL;
83 gba->stream = 0;
84 gba->keyCallback = 0;
85 gba->stopCallback = 0;
86
87 gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
88
89 gba->idleOptimization = IDLE_LOOP_REMOVE;
90 gba->idleLoop = IDLE_LOOP_NONE;
91 gba->lastJump = 0;
92 gba->haltPending = false;
93 gba->idleDetectionStep = 0;
94 gba->idleDetectionFailures = 0;
95
96 gba->realisticTiming = true;
97
98 gba->performingDMA = false;
99}
100
101void GBAUnloadROM(struct GBA* gba) {
102 if (gba->memory.rom && gba->pristineRom != gba->memory.rom) {
103 if (gba->yankedRomSize) {
104 gba->yankedRomSize = 0;
105 }
106 mappedMemoryFree(gba->memory.rom, SIZE_CART0);
107 }
108 gba->memory.rom = 0;
109
110 if (gba->romVf) {
111 gba->romVf->unmap(gba->romVf, gba->pristineRom, gba->pristineRomSize);
112 gba->pristineRom = 0;
113 gba->romVf = 0;
114 }
115}
116
117void GBADestroy(struct GBA* gba) {
118 GBAUnloadROM(gba);
119
120 if (gba->biosVf) {
121 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
122 }
123
124 GBAMemoryDeinit(gba);
125 GBAVideoDeinit(&gba->video);
126 GBAAudioDeinit(&gba->audio);
127 GBASIODeinit(&gba->sio);
128 gba->rr = 0;
129}
130
131void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
132 irqh->reset = GBAReset;
133 irqh->processEvents = GBAProcessEvents;
134 irqh->swi16 = GBASwi16;
135 irqh->swi32 = GBASwi32;
136 irqh->hitIllegal = GBAIllegal;
137 irqh->readCPSR = GBATestIRQ;
138 irqh->hitStub = GBAHitStub;
139 irqh->bkpt16 = GBABreakpoint;
140 irqh->bkpt32 = GBABreakpoint;
141}
142
143void GBAReset(struct ARMCore* cpu) {
144 ARMSetPrivilegeMode(cpu, MODE_IRQ);
145 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
146 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
147 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
148 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
149 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
150
151 struct GBA* gba = (struct GBA*) cpu->master;
152 if (!gba->rr || (!gba->rr->isPlaying(gba->rr) && !gba->rr->isRecording(gba->rr))) {
153 GBASavedataUnmask(&gba->memory.savedata);
154 }
155
156 if (gba->yankedRomSize) {
157 gba->memory.romSize = gba->yankedRomSize;
158 gba->yankedRomSize = 0;
159 }
160 GBAMemoryReset(gba);
161 GBAVideoReset(&gba->video);
162 GBAAudioReset(&gba->audio);
163 GBAIOInit(gba);
164
165 GBASIODeinit(&gba->sio);
166 GBASIOInit(&gba->sio);
167
168 gba->timersEnabled = 0;
169 memset(gba->timers, 0, sizeof(gba->timers));
170}
171
172void GBASkipBIOS(struct ARMCore* cpu) {
173 if (cpu->gprs[ARM_PC] == BASE_RESET + WORD_SIZE_ARM) {
174 cpu->gprs[ARM_PC] = BASE_CART0;
175 int currentCycles = 0;
176 ARM_WRITE_PC;
177 }
178}
179
180static void GBAProcessEvents(struct ARMCore* cpu) {
181 do {
182 struct GBA* gba = (struct GBA*) cpu->master;
183 int32_t cycles = cpu->nextEvent;
184 int32_t nextEvent = INT_MAX;
185 int32_t testEvent;
186
187 gba->bus = cpu->prefetch[1];
188 if (cpu->executionMode == MODE_THUMB) {
189 gba->bus |= cpu->prefetch[1] << 16;
190 }
191
192 if (gba->springIRQ) {
193 ARMRaiseIRQ(cpu);
194 gba->springIRQ = 0;
195 }
196
197 testEvent = GBAVideoProcessEvents(&gba->video, cycles);
198 if (testEvent < nextEvent) {
199 nextEvent = testEvent;
200 }
201
202 testEvent = GBAAudioProcessEvents(&gba->audio, cycles);
203 if (testEvent < nextEvent) {
204 nextEvent = testEvent;
205 }
206
207 testEvent = GBATimersProcessEvents(gba, cycles);
208 if (testEvent < nextEvent) {
209 nextEvent = testEvent;
210 }
211
212 testEvent = GBAMemoryRunDMAs(gba, cycles);
213 if (testEvent < nextEvent) {
214 nextEvent = testEvent;
215 }
216
217 testEvent = GBASIOProcessEvents(&gba->sio, cycles);
218 if (testEvent < nextEvent) {
219 nextEvent = testEvent;
220 }
221
222 cpu->cycles -= cycles;
223 cpu->nextEvent = nextEvent;
224
225 if (cpu->halted) {
226 cpu->cycles = cpu->nextEvent;
227 }
228 } while (cpu->cycles >= cpu->nextEvent);
229}
230
231static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
232 int32_t nextEvent = INT_MAX;
233 if (gba->timersEnabled) {
234 struct GBATimer* timer;
235 struct GBATimer* nextTimer;
236
237 timer = &gba->timers[0];
238 if (timer->enable) {
239 timer->nextEvent -= cycles;
240 timer->lastEvent -= cycles;
241 if (timer->nextEvent <= 0) {
242 timer->lastEvent = timer->nextEvent;
243 timer->nextEvent += timer->overflowInterval;
244 gba->memory.io[REG_TM0CNT_LO >> 1] = timer->reload;
245 timer->oldReload = timer->reload;
246
247 if (timer->doIrq) {
248 GBARaiseIRQ(gba, IRQ_TIMER0);
249 }
250
251 if (gba->audio.enable) {
252 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
253 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
254 }
255
256 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
257 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
258 }
259 }
260
261 nextTimer = &gba->timers[1];
262 if (nextTimer->countUp) {
263 ++gba->memory.io[REG_TM1CNT_LO >> 1];
264 if (!gba->memory.io[REG_TM1CNT_LO >> 1]) {
265 nextTimer->nextEvent = 0;
266 }
267 }
268 }
269 nextEvent = timer->nextEvent;
270 }
271
272 timer = &gba->timers[1];
273 if (timer->enable) {
274 timer->nextEvent -= cycles;
275 timer->lastEvent -= cycles;
276 if (timer->nextEvent <= 0) {
277 timer->lastEvent = timer->nextEvent;
278 timer->nextEvent += timer->overflowInterval;
279 gba->memory.io[REG_TM1CNT_LO >> 1] = timer->reload;
280 timer->oldReload = timer->reload;
281
282 if (timer->doIrq) {
283 GBARaiseIRQ(gba, IRQ_TIMER1);
284 }
285
286 if (gba->audio.enable) {
287 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
288 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
289 }
290
291 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
292 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
293 }
294 }
295
296 if (timer->countUp) {
297 timer->nextEvent = INT_MAX;
298 }
299
300 nextTimer = &gba->timers[2];
301 if (nextTimer->countUp) {
302 ++gba->memory.io[REG_TM2CNT_LO >> 1];
303 if (!gba->memory.io[REG_TM2CNT_LO >> 1]) {
304 nextTimer->nextEvent = 0;
305 }
306 }
307 }
308 if (timer->nextEvent < nextEvent) {
309 nextEvent = timer->nextEvent;
310 }
311 }
312
313 timer = &gba->timers[2];
314 if (timer->enable) {
315 timer->nextEvent -= cycles;
316 timer->lastEvent -= cycles;
317 if (timer->nextEvent <= 0) {
318 timer->lastEvent = timer->nextEvent;
319 timer->nextEvent += timer->overflowInterval;
320 gba->memory.io[REG_TM2CNT_LO >> 1] = timer->reload;
321 timer->oldReload = timer->reload;
322
323 if (timer->doIrq) {
324 GBARaiseIRQ(gba, IRQ_TIMER2);
325 }
326
327 if (timer->countUp) {
328 timer->nextEvent = INT_MAX;
329 }
330
331 nextTimer = &gba->timers[3];
332 if (nextTimer->countUp) {
333 ++gba->memory.io[REG_TM3CNT_LO >> 1];
334 if (!gba->memory.io[REG_TM3CNT_LO >> 1]) {
335 nextTimer->nextEvent = 0;
336 }
337 }
338 }
339 if (timer->nextEvent < nextEvent) {
340 nextEvent = timer->nextEvent;
341 }
342 }
343
344 timer = &gba->timers[3];
345 if (timer->enable) {
346 timer->nextEvent -= cycles;
347 timer->lastEvent -= cycles;
348 if (timer->nextEvent <= 0) {
349 timer->lastEvent = timer->nextEvent;
350 timer->nextEvent += timer->overflowInterval;
351 gba->memory.io[REG_TM3CNT_LO >> 1] = timer->reload;
352 timer->oldReload = timer->reload;
353
354 if (timer->doIrq) {
355 GBARaiseIRQ(gba, IRQ_TIMER3);
356 }
357
358 if (timer->countUp) {
359 timer->nextEvent = INT_MAX;
360 }
361 }
362 if (timer->nextEvent < nextEvent) {
363 nextEvent = timer->nextEvent;
364 }
365 }
366 }
367 return nextEvent;
368}
369
370void GBAAttachDebugger(struct GBA* gba, struct ARMDebugger* debugger) {
371 debugger->setSoftwareBreakpoint = _setSoftwareBreakpoint;
372 debugger->clearSoftwareBreakpoint = _clearSoftwareBreakpoint;
373 gba->debugger = debugger;
374 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = &debugger->d;
375 ARMHotplugAttach(gba->cpu, GBA_COMPONENT_DEBUGGER);
376}
377
378void GBADetachDebugger(struct GBA* gba) {
379 gba->debugger = 0;
380 ARMHotplugDetach(gba->cpu, GBA_COMPONENT_DEBUGGER);
381 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = 0;
382}
383
384void GBALoadROM(struct GBA* gba, struct VFile* vf, struct VFile* sav, const char* fname) {
385 GBAUnloadROM(gba);
386 gba->romVf = vf;
387 gba->pristineRomSize = vf->size(vf);
388 vf->seek(vf, 0, SEEK_SET);
389 if (gba->pristineRomSize > SIZE_CART0) {
390 gba->pristineRomSize = SIZE_CART0;
391 }
392 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
393 if (!gba->pristineRom) {
394 GBALog(gba, GBA_LOG_WARN, "Couldn't map ROM");
395 return;
396 }
397 gba->yankedRomSize = 0;
398 gba->memory.rom = gba->pristineRom;
399 gba->activeFile = fname;
400 gba->memory.romSize = gba->pristineRomSize;
401 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
402 GBASavedataInit(&gba->memory.savedata, sav);
403 GBAHardwareInit(&gba->memory.hw, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
404 // TODO: error check
405}
406
407void GBAYankROM(struct GBA* gba) {
408 gba->yankedRomSize = gba->memory.romSize;
409 gba->memory.romSize = 0;
410 GBARaiseIRQ(gba, IRQ_GAMEPAK);
411}
412
413void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
414 gba->biosVf = vf;
415 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
416 if (!bios) {
417 GBALog(gba, GBA_LOG_WARN, "Couldn't map BIOS");
418 return;
419 }
420 gba->memory.bios = bios;
421 gba->memory.fullBios = 1;
422 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
423 GBALog(gba, GBA_LOG_DEBUG, "BIOS Checksum: 0x%X", checksum);
424 if (checksum == GBA_BIOS_CHECKSUM) {
425 GBALog(gba, GBA_LOG_INFO, "Official GBA BIOS detected");
426 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
427 GBALog(gba, GBA_LOG_INFO, "Official GBA (DS) BIOS detected");
428 } else {
429 GBALog(gba, GBA_LOG_WARN, "BIOS checksum incorrect");
430 }
431 gba->biosChecksum = checksum;
432 if (gba->memory.activeRegion == REGION_BIOS) {
433 gba->cpu->memory.activeRegion = gba->memory.bios;
434 }
435 // TODO: error check
436}
437
438void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
439 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
440 if (!patchedSize || patchedSize > SIZE_CART0) {
441 return;
442 }
443 gba->memory.rom = anonymousMemoryMap(SIZE_CART0);
444 if (!patch->applyPatch(patch, gba->pristineRom, gba->pristineRomSize, gba->memory.rom, patchedSize)) {
445 mappedMemoryFree(gba->memory.rom, patchedSize);
446 gba->memory.rom = gba->pristineRom;
447 return;
448 }
449 gba->memory.romSize = patchedSize;
450 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
451}
452
453void GBATimerUpdateRegister(struct GBA* gba, int timer) {
454 struct GBATimer* currentTimer = &gba->timers[timer];
455 if (currentTimer->enable && !currentTimer->countUp) {
456 int32_t prefetchSkew = 0;
457 if (gba->memory.lastPrefetchedPc - gba->memory.lastPrefetchedLoads * WORD_SIZE_THUMB >= (uint32_t) gba->cpu->gprs[ARM_PC]) {
458 prefetchSkew = (gba->memory.lastPrefetchedPc - gba->cpu->gprs[ARM_PC]) * (gba->cpu->memory.activeSeqCycles16 + 1) / WORD_SIZE_THUMB;
459 }
460 // Reading this takes two cycles (1N+1I), so let's remove them preemptively
461 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent - 2 + prefetchSkew) >> currentTimer->prescaleBits);
462 }
463}
464
465void GBATimerWriteTMCNT_LO(struct GBA* gba, int timer, uint16_t reload) {
466 gba->timers[timer].reload = reload;
467 gba->timers[timer].overflowInterval = (0x10000 - gba->timers[timer].reload) << gba->timers[timer].prescaleBits;
468}
469
470void GBATimerWriteTMCNT_HI(struct GBA* gba, int timer, uint16_t control) {
471 struct GBATimer* currentTimer = &gba->timers[timer];
472 GBATimerUpdateRegister(gba, timer);
473
474 int oldPrescale = currentTimer->prescaleBits;
475 switch (control & 0x0003) {
476 case 0x0000:
477 currentTimer->prescaleBits = 0;
478 break;
479 case 0x0001:
480 currentTimer->prescaleBits = 6;
481 break;
482 case 0x0002:
483 currentTimer->prescaleBits = 8;
484 break;
485 case 0x0003:
486 currentTimer->prescaleBits = 10;
487 break;
488 }
489 currentTimer->countUp = !!(control & 0x0004);
490 currentTimer->doIrq = !!(control & 0x0040);
491 currentTimer->overflowInterval = (0x10000 - currentTimer->reload) << currentTimer->prescaleBits;
492 int wasEnabled = currentTimer->enable;
493 currentTimer->enable = !!(control & 0x0080);
494 if (!wasEnabled && currentTimer->enable) {
495 if (!currentTimer->countUp) {
496 currentTimer->nextEvent = gba->cpu->cycles + currentTimer->overflowInterval;
497 } else {
498 currentTimer->nextEvent = INT_MAX;
499 }
500 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->reload;
501 currentTimer->oldReload = currentTimer->reload;
502 currentTimer->lastEvent = gba->cpu->cycles;
503 gba->timersEnabled |= 1 << timer;
504 } else if (wasEnabled && !currentTimer->enable) {
505 if (!currentTimer->countUp) {
506 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> oldPrescale);
507 }
508 gba->timersEnabled &= ~(1 << timer);
509 } else if (currentTimer->prescaleBits != oldPrescale && !currentTimer->countUp) {
510 // FIXME: this might be before present
511 currentTimer->nextEvent = currentTimer->lastEvent + currentTimer->overflowInterval;
512 }
513
514 if (currentTimer->nextEvent < gba->cpu->nextEvent) {
515 gba->cpu->nextEvent = currentTimer->nextEvent;
516 }
517};
518
519void GBAWriteIE(struct GBA* gba, uint16_t value) {
520 if (value & (1 << IRQ_KEYPAD)) {
521 GBALog(gba, GBA_LOG_STUB, "Keypad interrupts not implemented");
522 }
523
524 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
525 ARMRaiseIRQ(gba->cpu);
526 }
527}
528
529void GBAWriteIME(struct GBA* gba, uint16_t value) {
530 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
531 ARMRaiseIRQ(gba->cpu);
532 }
533}
534
535void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
536 gba->memory.io[REG_IF >> 1] |= 1 << irq;
537 gba->cpu->halted = 0;
538
539 if (gba->memory.io[REG_IME >> 1] && (gba->memory.io[REG_IE >> 1] & 1 << irq)) {
540 ARMRaiseIRQ(gba->cpu);
541 }
542}
543
544void GBATestIRQ(struct ARMCore* cpu) {
545 struct GBA* gba = (struct GBA*) cpu->master;
546 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
547 gba->springIRQ = 1;
548 gba->cpu->nextEvent = 0;
549 }
550}
551
552void GBAHalt(struct GBA* gba) {
553 gba->cpu->nextEvent = 0;
554 gba->cpu->halted = 1;
555}
556
557void GBAStop(struct GBA* gba) {
558 if (!gba->stopCallback) {
559 return;
560 }
561 gba->cpu->nextEvent = 0;
562 gba->stopCallback->stop(gba->stopCallback);
563}
564
565static void _GBAVLog(struct GBA* gba, enum GBALogLevel level, const char* format, va_list args) {
566 struct GBAThread* threadContext = GBAThreadGetContext();
567 enum GBALogLevel logLevel = GBA_LOG_ALL;
568
569 if (gba) {
570 logLevel = gba->logLevel;
571 }
572
573 if (threadContext) {
574 logLevel = threadContext->logLevel;
575 gba = threadContext->gba;
576 }
577
578 if (!(level & logLevel) && level != GBA_LOG_FATAL) {
579 return;
580 }
581
582 if (level == GBA_LOG_FATAL && gba) {
583 gba->cpu->nextEvent = 0;
584 }
585
586 if (threadContext) {
587 if (level == GBA_LOG_FATAL) {
588 MutexLock(&threadContext->stateMutex);
589 threadContext->state = THREAD_CRASHED;
590 MutexUnlock(&threadContext->stateMutex);
591 }
592 }
593 if (gba && gba->logHandler) {
594 gba->logHandler(threadContext, level, format, args);
595 return;
596 }
597
598 vprintf(format, args);
599 printf("\n");
600
601 if (level == GBA_LOG_FATAL && !threadContext) {
602 abort();
603 }
604}
605
606void GBALog(struct GBA* gba, enum GBALogLevel level, const char* format, ...) {
607 va_list args;
608 va_start(args, format);
609 _GBAVLog(gba, level, format, args);
610 va_end(args);
611}
612
613void GBADebuggerLogShim(struct ARMDebugger* debugger, enum DebuggerLogLevel level, const char* format, ...) {
614 struct GBA* gba = 0;
615 if (debugger->cpu) {
616 gba = (struct GBA*) debugger->cpu->master;
617 }
618
619 enum GBALogLevel gbaLevel;
620 switch (level) {
621 default: // Avoids compiler warning
622 case DEBUGGER_LOG_DEBUG:
623 gbaLevel = GBA_LOG_DEBUG;
624 break;
625 case DEBUGGER_LOG_INFO:
626 gbaLevel = GBA_LOG_INFO;
627 break;
628 case DEBUGGER_LOG_WARN:
629 gbaLevel = GBA_LOG_WARN;
630 break;
631 case DEBUGGER_LOG_ERROR:
632 gbaLevel = GBA_LOG_ERROR;
633 break;
634 }
635 va_list args;
636 va_start(args, format);
637 _GBAVLog(gba, gbaLevel, format, args);
638 va_end(args);
639}
640
641bool GBAIsROM(struct VFile* vf) {
642 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
643 return false;
644 }
645 uint8_t signature[sizeof(GBA_ROM_MAGIC)];
646 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
647 return false;
648 }
649 return memcmp(signature, GBA_ROM_MAGIC, sizeof(signature)) == 0;
650}
651
652bool GBAIsBIOS(struct VFile* vf) {
653 if (vf->seek(vf, 0, SEEK_SET) < 0) {
654 return false;
655 }
656 uint32_t interruptTable[7];
657 if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
658 return false;
659 }
660 int i;
661 for (i = 0; i < 7; ++i) {
662 if ((interruptTable[i] & 0xFFFF0000) != 0xEA000000) {
663 return false;
664 }
665 }
666 return true;
667}
668
669void GBAGetGameCode(struct GBA* gba, char* out) {
670 if (!gba->memory.rom) {
671 out[0] = '\0';
672 return;
673 }
674 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->id, 4);
675}
676
677void GBAGetGameTitle(struct GBA* gba, char* out) {
678 if (!gba->memory.rom) {
679 strncpy(out, "(BIOS)", 12);
680 return;
681 }
682 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
683}
684
685void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
686 struct GBA* gba = (struct GBA*) cpu->master;
687 enum GBALogLevel level = GBA_LOG_ERROR;
688 if (gba->debugger) {
689 level = GBA_LOG_STUB;
690 struct DebuggerEntryInfo info = {
691 .address = _ARMPCAddress(cpu),
692 .opcode = opcode
693 };
694 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP, &info);
695 }
696 GBALog(gba, level, "Stub opcode: %08x", opcode);
697}
698
699void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
700 struct GBA* gba = (struct GBA*) cpu->master;
701 if (!gba->yankedRomSize) {
702 GBALog(gba, GBA_LOG_WARN, "Illegal opcode: %08x", opcode);
703 }
704 if (gba->debugger) {
705 struct DebuggerEntryInfo info = {
706 .address = _ARMPCAddress(cpu),
707 .opcode = opcode
708 };
709 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP, &info);
710 } else {
711 ARMRaiseUndefined(cpu);
712 }
713}
714
715void GBABreakpoint(struct ARMCore* cpu, int immediate) {
716 struct GBA* gba = (struct GBA*) cpu->master;
717 if (immediate >= GBA_COMPONENT_MAX) {
718 return;
719 }
720 switch (immediate) {
721 case GBA_COMPONENT_DEBUGGER:
722 if (gba->debugger) {
723 struct DebuggerEntryInfo info = {
724 .address = _ARMPCAddress(cpu)
725 };
726 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_BREAKPOINT, &info);
727 }
728 break;
729 case GBA_COMPONENT_CHEAT_DEVICE:
730 if (gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE]) {
731 struct GBACheatDevice* device = (struct GBACheatDevice*) gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE];
732 struct GBACheatHook* hook = 0;
733 size_t i;
734 for (i = 0; i < GBACheatSetsSize(&device->cheats); ++i) {
735 struct GBACheatSet* cheats = *GBACheatSetsGetPointer(&device->cheats, i);
736 if (cheats->hook && cheats->hook->address == _ARMPCAddress(cpu)) {
737 GBACheatRefresh(device, cheats);
738 hook = cheats->hook;
739 }
740 }
741 if (hook) {
742 ARMRunFake(cpu, hook->patchedOpcode);
743 }
744 }
745 break;
746 default:
747 break;
748 }
749}
750
751void GBAFrameStarted(struct GBA* gba) {
752 UNUSED(gba);
753
754 struct GBAThread* thread = GBAThreadGetContext();
755 if (!thread) {
756 return;
757 }
758
759 if (thread->rewindBuffer) {
760 --thread->rewindBufferNext;
761 if (thread->rewindBufferNext <= 0) {
762 thread->rewindBufferNext = thread->rewindBufferInterval;
763 GBARecordFrame(thread);
764 }
765 }
766}
767
768void GBAFrameEnded(struct GBA* gba) {
769 GBASavedataClean(&gba->memory.savedata, gba->video.frameCounter);
770
771 if (gba->rr) {
772 gba->rr->nextFrame(gba->rr);
773 }
774
775 if (gba->cpu->components && gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE]) {
776 struct GBACheatDevice* device = (struct GBACheatDevice*) gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE];
777 size_t i;
778 for (i = 0; i < GBACheatSetsSize(&device->cheats); ++i) {
779 struct GBACheatSet* cheats = *GBACheatSetsGetPointer(&device->cheats, i);
780 if (!cheats->hook) {
781 GBACheatRefresh(device, cheats);
782 }
783 }
784 }
785
786 if (gba->stream) {
787 gba->stream->postVideoFrame(gba->stream, gba->video.renderer);
788 }
789
790 if (gba->memory.hw.devices & (HW_GB_PLAYER | HW_GB_PLAYER_DETECTION)) {
791 GBAHardwarePlayerUpdate(gba);
792 }
793
794 struct GBAThread* thread = GBAThreadGetContext();
795 if (!thread) {
796 return;
797 }
798
799 if (thread->frameCallback) {
800 thread->frameCallback(thread);
801 }
802}
803
804void GBASetBreakpoint(struct GBA* gba, struct ARMComponent* component, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
805 size_t immediate;
806 for (immediate = 0; immediate < gba->cpu->numComponents; ++immediate) {
807 if (gba->cpu->components[immediate] == component) {
808 break;
809 }
810 }
811 if (immediate == gba->cpu->numComponents) {
812 return;
813 }
814 if (mode == MODE_ARM) {
815 int32_t value;
816 int32_t old;
817 value = 0xE1200070;
818 value |= immediate & 0xF;
819 value |= (immediate & 0xFFF0) << 4;
820 GBAPatch32(gba->cpu, address, value, &old);
821 *opcode = old;
822 } else {
823 int16_t value;
824 int16_t old;
825 value = 0xBE00;
826 value |= immediate & 0xFF;
827 GBAPatch16(gba->cpu, address, value, &old);
828 *opcode = (uint16_t) old;
829 }
830}
831
832void GBAClearBreakpoint(struct GBA* gba, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
833 if (mode == MODE_ARM) {
834 GBAPatch32(gba->cpu, address, opcode, 0);
835 } else {
836 GBAPatch16(gba->cpu, address, opcode, 0);
837 }
838}
839
840static bool _setSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
841 GBASetBreakpoint((struct GBA*) debugger->cpu->master, &debugger->d, address, mode, opcode);
842 return true;
843}
844
845static bool _clearSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
846 GBAClearBreakpoint((struct GBA*) debugger->cpu->master, address, mode, opcode);
847 return true;
848}