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