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