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