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