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 "core/thread.h"
9
10#include "arm/decoder.h"
11#include "arm/debugger/debugger.h"
12#include "arm/isa-inlines.h"
13
14#include "gba/bios.h"
15#include "gba/cheats.h"
16#include "gba/io.h"
17#include "gba/overrides.h"
18#include "gba/rr/rr.h"
19#include "gba/serialize.h"
20#include "gba/sio.h"
21#include "gba/vfame.h"
22
23#include "util/crc32.h"
24#include "util/memory.h"
25#include "util/math.h"
26#include "util/patch.h"
27#include "util/vfs.h"
28
29mLOG_DEFINE_CATEGORY(GBA, "GBA");
30mLOG_DEFINE_CATEGORY(GBA_DEBUG, "GBA Debug");
31
32const uint32_t GBA_COMPONENT_MAGIC = 0x1000000;
33
34static const size_t GBA_ROM_MAGIC_OFFSET = 3;
35static const uint8_t GBA_ROM_MAGIC[] = { 0xEA };
36
37static const size_t GBA_MB_MAGIC_OFFSET = 0xC0;
38
39static void GBAInit(void* cpu, struct mCPUComponent* component);
40static void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh);
41static void GBAProcessEvents(struct ARMCore* cpu);
42static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles);
43static void GBAHitStub(struct ARMCore* cpu, uint32_t opcode);
44static void GBAIllegal(struct ARMCore* cpu, uint32_t opcode);
45static void GBABreakpoint(struct ARMCore* cpu, int immediate);
46
47static bool _setSoftwareBreakpoint(struct ARMDebugger*, uint32_t address, enum ExecutionMode mode, uint32_t* opcode);
48static bool _clearSoftwareBreakpoint(struct ARMDebugger*, uint32_t address, enum ExecutionMode mode, uint32_t opcode);
49
50
51#ifdef _3DS
52extern uint32_t* romBuffer;
53extern size_t romBufferSize;
54#endif
55
56void GBACreate(struct GBA* gba) {
57 gba->d.id = GBA_COMPONENT_MAGIC;
58 gba->d.init = GBAInit;
59 gba->d.deinit = 0;
60}
61
62static void GBAInit(void* cpu, struct mCPUComponent* component) {
63 struct GBA* gba = (struct GBA*) component;
64 gba->cpu = cpu;
65 gba->debugger = 0;
66 gba->sync = 0;
67
68 GBAInterruptHandlerInit(&gba->cpu->irqh);
69 GBAMemoryInit(gba);
70 GBASavedataInit(&gba->memory.savedata, 0);
71
72 gba->video.p = gba;
73 GBAVideoInit(&gba->video);
74
75 gba->audio.p = gba;
76 GBAAudioInit(&gba->audio, GBA_AUDIO_SAMPLES);
77
78 GBAIOInit(gba);
79
80 gba->sio.p = gba;
81 GBASIOInit(&gba->sio);
82
83 gba->timersEnabled = 0;
84 memset(gba->timers, 0, sizeof(gba->timers));
85
86 gba->springIRQ = 0;
87 gba->keySource = 0;
88 gba->rotationSource = 0;
89 gba->luminanceSource = 0;
90 gba->rtcSource = 0;
91 gba->rumble = 0;
92 gba->rr = 0;
93
94 gba->romVf = 0;
95 gba->biosVf = 0;
96
97 gba->stream = NULL;
98 gba->keyCallback = NULL;
99 gba->stopCallback = NULL;
100 gba->stopCallback = NULL;
101 gba->coreCallbacks = NULL;
102
103 gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
104
105 gba->idleOptimization = IDLE_LOOP_REMOVE;
106 gba->idleLoop = IDLE_LOOP_NONE;
107
108 gba->realisticTiming = true;
109 gba->hardCrash = true;
110 gba->allowOpposingDirections = true;
111
112 gba->performingDMA = false;
113
114 gba->pristineRom = 0;
115 gba->pristineRomSize = 0;
116 gba->yankedRomSize = 0;
117}
118
119void GBAUnloadROM(struct GBA* gba) {
120 if (gba->memory.rom && gba->pristineRom != gba->memory.rom) {
121 if (gba->yankedRomSize) {
122 gba->yankedRomSize = 0;
123 }
124 mappedMemoryFree(gba->memory.rom, SIZE_CART0);
125 }
126 gba->memory.rom = 0;
127
128 if (gba->romVf) {
129#ifndef _3DS
130 gba->romVf->unmap(gba->romVf, gba->pristineRom, gba->pristineRomSize);
131#endif
132 gba->romVf->close(gba->romVf);
133 gba->romVf = 0;
134 }
135 gba->pristineRom = 0;
136
137 GBASavedataDeinit(&gba->memory.savedata);
138 if (gba->memory.savedata.realVf) {
139 gba->memory.savedata.realVf->close(gba->memory.savedata.realVf);
140 gba->memory.savedata.realVf = 0;
141 }
142 gba->idleLoop = IDLE_LOOP_NONE;
143}
144
145void GBADestroy(struct GBA* gba) {
146 GBAUnloadROM(gba);
147
148 if (gba->biosVf) {
149 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
150 gba->biosVf->close(gba->biosVf);
151 gba->biosVf = 0;
152 }
153
154 GBAMemoryDeinit(gba);
155 GBAVideoDeinit(&gba->video);
156 GBAAudioDeinit(&gba->audio);
157 GBASIODeinit(&gba->sio);
158 gba->rr = 0;
159}
160
161void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
162 irqh->reset = GBAReset;
163 irqh->processEvents = GBAProcessEvents;
164 irqh->swi16 = GBASwi16;
165 irqh->swi32 = GBASwi32;
166 irqh->hitIllegal = GBAIllegal;
167 irqh->readCPSR = GBATestIRQ;
168 irqh->hitStub = GBAHitStub;
169 irqh->bkpt16 = GBABreakpoint;
170 irqh->bkpt32 = GBABreakpoint;
171}
172
173void GBAReset(struct ARMCore* cpu) {
174 ARMSetPrivilegeMode(cpu, MODE_IRQ);
175 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
176 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
177 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
178 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
179 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
180
181 struct GBA* gba = (struct GBA*) cpu->master;
182 if (!gba->rr || (!gba->rr->isPlaying(gba->rr) && !gba->rr->isRecording(gba->rr))) {
183 GBASavedataUnmask(&gba->memory.savedata);
184 }
185
186 if (gba->yankedRomSize) {
187 gba->memory.romSize = gba->yankedRomSize;
188 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
189 gba->yankedRomSize = 0;
190 }
191 GBAMemoryReset(gba);
192 GBAVideoReset(&gba->video);
193 GBAAudioReset(&gba->audio);
194 GBAIOInit(gba);
195
196 GBASIOReset(&gba->sio);
197
198 gba->timersEnabled = 0;
199 memset(gba->timers, 0, sizeof(gba->timers));
200
201 gba->lastJump = 0;
202 gba->haltPending = false;
203 gba->idleDetectionStep = 0;
204 gba->idleDetectionFailures = 0;
205
206 gba->debug = false;
207 memset(gba->debugString, 0, sizeof(gba->debugString));
208}
209
210void GBASkipBIOS(struct GBA* gba) {
211 struct ARMCore* cpu = gba->cpu;
212 if (cpu->gprs[ARM_PC] == BASE_RESET + WORD_SIZE_ARM) {
213 if (gba->memory.rom) {
214 cpu->gprs[ARM_PC] = BASE_CART0;
215 } else {
216 cpu->gprs[ARM_PC] = BASE_WORKING_RAM;
217 }
218 int currentCycles = 0;
219 ARM_WRITE_PC;
220 }
221}
222
223static void GBAProcessEvents(struct ARMCore* cpu) {
224 struct GBA* gba = (struct GBA*) cpu->master;
225
226 gba->bus = cpu->prefetch[1];
227 if (cpu->executionMode == MODE_THUMB) {
228 gba->bus |= cpu->prefetch[1] << 16;
229 }
230
231 if (gba->springIRQ && !cpu->cpsr.i) {
232 ARMRaiseIRQ(cpu);
233 gba->springIRQ = 0;
234 }
235
236 do {
237 int32_t cycles = cpu->nextEvent;
238 int32_t nextEvent = INT_MAX;
239 int32_t testEvent;
240#ifndef NDEBUG
241 if (cycles < 0) {
242 mLOG(GBA, FATAL, "Negative cycles passed: %i", cycles);
243 }
244#endif
245
246 testEvent = GBAVideoProcessEvents(&gba->video, cycles);
247 if (testEvent < nextEvent) {
248#ifndef NDEBUG
249 if (testEvent == 0) {
250 mLOG(GBA, ERROR, "Video requiring 0 cycles");
251 }
252#endif
253 nextEvent = testEvent;
254 }
255
256 testEvent = GBAAudioProcessEvents(&gba->audio, cycles);
257 if (testEvent < nextEvent) {
258#ifndef NDEBUG
259 if (testEvent == 0) {
260 mLOG(GBA, ERROR, "Audio requiring 0 cycles");
261 }
262#endif
263 nextEvent = testEvent;
264 }
265
266 testEvent = GBATimersProcessEvents(gba, cycles);
267 if (testEvent < nextEvent) {
268#ifndef NDEBUG
269 if (testEvent == 0) {
270 mLOG(GBA, ERROR, "Timers requiring 0 cycles");
271 }
272#endif
273 nextEvent = testEvent;
274 }
275
276 testEvent = GBAMemoryRunDMAs(gba, cycles);
277 if (testEvent < nextEvent) {
278#ifndef NDEBUG
279 if (testEvent == 0) {
280 mLOG(GBA, ERROR, "DMAs requiring 0 cycles");
281 }
282#endif
283 nextEvent = testEvent;
284 }
285
286 testEvent = GBASIOProcessEvents(&gba->sio, cycles);
287 if (testEvent < nextEvent) {
288 nextEvent = testEvent;
289 }
290
291 cpu->cycles -= cycles;
292 cpu->nextEvent = nextEvent;
293
294 if (cpu->halted) {
295 cpu->cycles = cpu->nextEvent;
296 if (!gba->memory.io[REG_IME >> 1] || !gba->memory.io[REG_IE >> 1]) {
297 break;
298 }
299 }
300 if (nextEvent == 0) {
301 break;
302 }
303#ifndef NDEBUG
304 else if (nextEvent < 0) {
305 mLOG(GBA, FATAL, "Negative cycles will pass: %i", nextEvent);
306 }
307#endif
308 } while (cpu->cycles >= cpu->nextEvent);
309}
310
311static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
312 int32_t nextEvent = INT_MAX;
313 if (gba->timersEnabled) {
314 struct GBATimer* timer;
315 struct GBATimer* nextTimer;
316
317 timer = &gba->timers[0];
318 if (GBATimerFlagsIsEnable(timer->flags) && timer->nextEvent != INT_MAX) {
319 timer->nextEvent -= cycles;
320 timer->lastEvent -= cycles;
321 while (timer->nextEvent <= 0) {
322 timer->lastEvent = timer->nextEvent;
323 timer->nextEvent += timer->overflowInterval;
324 gba->memory.io[REG_TM0CNT_LO >> 1] = timer->reload;
325 timer->oldReload = timer->reload;
326
327 if (GBATimerFlagsIsDoIrq(timer->flags)) {
328 GBARaiseIRQ(gba, IRQ_TIMER0);
329 }
330
331 if (gba->audio.enable) {
332 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
333 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
334 }
335
336 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
337 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
338 }
339 }
340
341 nextTimer = &gba->timers[1];
342 if (GBATimerFlagsIsCountUp(nextTimer->flags)) {
343 ++gba->memory.io[REG_TM1CNT_LO >> 1];
344 if (!gba->memory.io[REG_TM1CNT_LO >> 1]) {
345 nextTimer->nextEvent = cycles;
346 }
347 }
348 }
349 nextEvent = timer->nextEvent;
350 }
351
352 timer = &gba->timers[1];
353 if (GBATimerFlagsIsEnable(timer->flags) && timer->nextEvent != INT_MAX) {
354 timer->nextEvent -= cycles;
355 timer->lastEvent -= cycles;
356 if (timer->nextEvent <= 0) {
357 timer->lastEvent = timer->nextEvent;
358 timer->nextEvent += timer->overflowInterval;
359 gba->memory.io[REG_TM1CNT_LO >> 1] = timer->reload;
360 timer->oldReload = timer->reload;
361
362 if (GBATimerFlagsIsDoIrq(timer->flags)) {
363 GBARaiseIRQ(gba, IRQ_TIMER1);
364 }
365
366 if (gba->audio.enable) {
367 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
368 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
369 }
370
371 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
372 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
373 }
374 }
375
376 if (GBATimerFlagsIsCountUp(timer->flags)) {
377 timer->nextEvent = INT_MAX;
378 }
379
380 nextTimer = &gba->timers[2];
381 if (GBATimerFlagsIsCountUp(nextTimer->flags)) {
382 ++gba->memory.io[REG_TM2CNT_LO >> 1];
383 if (!gba->memory.io[REG_TM2CNT_LO >> 1]) {
384 nextTimer->nextEvent = cycles;
385 }
386 }
387 }
388 if (timer->nextEvent < nextEvent) {
389 nextEvent = timer->nextEvent;
390 }
391 }
392
393 timer = &gba->timers[2];
394 if (GBATimerFlagsIsEnable(timer->flags) && timer->nextEvent != INT_MAX) {
395 timer->nextEvent -= cycles;
396 timer->lastEvent -= cycles;
397 if (timer->nextEvent <= 0) {
398 timer->lastEvent = timer->nextEvent;
399 timer->nextEvent += timer->overflowInterval;
400 gba->memory.io[REG_TM2CNT_LO >> 1] = timer->reload;
401 timer->oldReload = timer->reload;
402
403 if (GBATimerFlagsIsDoIrq(timer->flags)) {
404 GBARaiseIRQ(gba, IRQ_TIMER2);
405 }
406
407 if (GBATimerFlagsIsCountUp(timer->flags)) {
408 timer->nextEvent = INT_MAX;
409 }
410
411 nextTimer = &gba->timers[3];
412 if (GBATimerFlagsIsCountUp(nextTimer->flags)) {
413 ++gba->memory.io[REG_TM3CNT_LO >> 1];
414 if (!gba->memory.io[REG_TM3CNT_LO >> 1]) {
415 nextTimer->nextEvent = cycles;
416 }
417 }
418 }
419 if (timer->nextEvent < nextEvent) {
420 nextEvent = timer->nextEvent;
421 }
422 }
423
424 timer = &gba->timers[3];
425 if (GBATimerFlagsIsEnable(timer->flags) && timer->nextEvent != INT_MAX) {
426 timer->nextEvent -= cycles;
427 timer->lastEvent -= cycles;
428 if (timer->nextEvent <= 0) {
429 timer->lastEvent = timer->nextEvent;
430 timer->nextEvent += timer->overflowInterval;
431 gba->memory.io[REG_TM3CNT_LO >> 1] = timer->reload;
432 timer->oldReload = timer->reload;
433
434 if (GBATimerFlagsIsDoIrq(timer->flags)) {
435 GBARaiseIRQ(gba, IRQ_TIMER3);
436 }
437
438 if (GBATimerFlagsIsCountUp(timer->flags)) {
439 timer->nextEvent = INT_MAX;
440 }
441 }
442 if (timer->nextEvent < nextEvent) {
443 nextEvent = timer->nextEvent;
444 }
445 }
446 }
447 return nextEvent;
448}
449
450void GBAAttachDebugger(struct GBA* gba, struct mDebugger* debugger) {
451 gba->debugger = (struct ARMDebugger*) debugger->platform;
452 gba->debugger->setSoftwareBreakpoint = _setSoftwareBreakpoint;
453 gba->debugger->clearSoftwareBreakpoint = _clearSoftwareBreakpoint;
454 gba->cpu->components[CPU_COMPONENT_DEBUGGER] = &debugger->d;
455 ARMHotplugAttach(gba->cpu, CPU_COMPONENT_DEBUGGER);
456}
457
458void GBADetachDebugger(struct GBA* gba) {
459 gba->debugger = 0;
460 ARMHotplugDetach(gba->cpu, CPU_COMPONENT_DEBUGGER);
461 gba->cpu->components[CPU_COMPONENT_DEBUGGER] = 0;
462}
463
464bool GBALoadMB(struct GBA* gba, struct VFile* vf) {
465 GBAUnloadROM(gba);
466 gba->romVf = vf;
467 gba->pristineRomSize = vf->size(vf);
468 vf->seek(vf, 0, SEEK_SET);
469 if (gba->pristineRomSize > SIZE_WORKING_RAM) {
470 gba->pristineRomSize = SIZE_WORKING_RAM;
471 }
472#ifdef _3DS
473 gba->pristineRom = 0;
474 if (gba->pristineRomSize <= romBufferSize) {
475 gba->pristineRom = romBuffer;
476 vf->read(vf, romBuffer, gba->pristineRomSize);
477 }
478#else
479 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
480#endif
481 if (!gba->pristineRom) {
482 mLOG(GBA, WARN, "Couldn't map ROM");
483 return false;
484 }
485 gba->yankedRomSize = 0;
486 gba->memory.romSize = 0;
487 gba->memory.romMask = 0;
488 gba->romCrc32 = doCrc32(gba->pristineRom, gba->pristineRomSize);
489 return true;
490}
491
492bool GBALoadROM(struct GBA* gba, struct VFile* vf) {
493 if (!vf) {
494 return false;
495 }
496 GBAUnloadROM(gba);
497 gba->romVf = vf;
498 gba->pristineRomSize = vf->size(vf);
499 vf->seek(vf, 0, SEEK_SET);
500 if (gba->pristineRomSize > SIZE_CART0) {
501 gba->pristineRomSize = SIZE_CART0;
502 }
503#ifdef _3DS
504 gba->pristineRom = 0;
505 if (gba->pristineRomSize <= romBufferSize) {
506 gba->pristineRom = romBuffer;
507 vf->read(vf, romBuffer, gba->pristineRomSize);
508 }
509#else
510 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
511#endif
512 if (!gba->pristineRom) {
513 mLOG(GBA, WARN, "Couldn't map ROM");
514 return false;
515 }
516 gba->yankedRomSize = 0;
517 gba->memory.rom = gba->pristineRom;
518 gba->memory.romSize = gba->pristineRomSize;
519 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
520 gba->memory.mirroring = false;
521 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
522 GBAHardwareInit(&gba->memory.hw, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
523 GBAVFameDetect(&gba->memory.vfame, gba->memory.rom, gba->memory.romSize);
524 // TODO: error check
525 return true;
526}
527
528bool GBALoadSave(struct GBA* gba, struct VFile* sav) {
529 GBASavedataInit(&gba->memory.savedata, sav);
530 return true;
531}
532
533void GBAYankROM(struct GBA* gba) {
534 gba->yankedRomSize = gba->memory.romSize;
535 gba->memory.romSize = 0;
536 gba->memory.romMask = 0;
537 GBARaiseIRQ(gba, IRQ_GAMEPAK);
538}
539
540void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
541 gba->biosVf = vf;
542 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
543 if (!bios) {
544 mLOG(GBA, WARN, "Couldn't map BIOS");
545 return;
546 }
547 gba->memory.bios = bios;
548 gba->memory.fullBios = 1;
549 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
550 mLOG(GBA, DEBUG, "BIOS Checksum: 0x%X", checksum);
551 if (checksum == GBA_BIOS_CHECKSUM) {
552 mLOG(GBA, INFO, "Official GBA BIOS detected");
553 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
554 mLOG(GBA, INFO, "Official GBA (DS) BIOS detected");
555 } else {
556 mLOG(GBA, WARN, "BIOS checksum incorrect");
557 }
558 gba->biosChecksum = checksum;
559 if (gba->memory.activeRegion == REGION_BIOS) {
560 gba->cpu->memory.activeRegion = gba->memory.bios;
561 }
562 // TODO: error check
563}
564
565void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
566 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
567 if (!patchedSize || patchedSize > SIZE_CART0) {
568 return;
569 }
570 gba->memory.rom = anonymousMemoryMap(SIZE_CART0);
571 if (!patch->applyPatch(patch, gba->pristineRom, gba->pristineRomSize, gba->memory.rom, patchedSize)) {
572 mappedMemoryFree(gba->memory.rom, patchedSize);
573 gba->memory.rom = gba->pristineRom;
574 return;
575 }
576 gba->memory.romSize = patchedSize;
577 gba->memory.romMask = SIZE_CART0 - 1;
578 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
579}
580
581void GBATimerUpdateRegister(struct GBA* gba, int timer) {
582 struct GBATimer* currentTimer = &gba->timers[timer];
583 if (GBATimerFlagsIsEnable(currentTimer->flags) && !GBATimerFlagsIsCountUp(currentTimer->flags)) {
584 int32_t prefetchSkew = 0;
585 if (gba->memory.lastPrefetchedPc >= (uint32_t) gba->cpu->gprs[ARM_PC]) {
586 prefetchSkew = (gba->memory.lastPrefetchedPc - gba->cpu->gprs[ARM_PC]) * (gba->cpu->memory.activeSeqCycles16 + 1) / WORD_SIZE_THUMB;
587 }
588 // Reading this takes two cycles (1N+1I), so let's remove them preemptively
589 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent - 2 + prefetchSkew) >> GBATimerFlagsGetPrescaleBits(currentTimer->flags));
590 }
591}
592
593void GBATimerWriteTMCNT_LO(struct GBA* gba, int timer, uint16_t reload) {
594 gba->timers[timer].reload = reload;
595 gba->timers[timer].overflowInterval = (0x10000 - gba->timers[timer].reload) << GBATimerFlagsGetPrescaleBits(gba->timers[timer].flags);
596}
597
598void GBATimerWriteTMCNT_HI(struct GBA* gba, int timer, uint16_t control) {
599 struct GBATimer* currentTimer = &gba->timers[timer];
600 GBATimerUpdateRegister(gba, timer);
601
602 unsigned oldPrescale = GBATimerFlagsGetPrescaleBits(currentTimer->flags);
603 switch (control & 0x0003) {
604 case 0x0000:
605 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 0);
606 break;
607 case 0x0001:
608 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 6);
609 break;
610 case 0x0002:
611 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 8);
612 break;
613 case 0x0003:
614 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 10);
615 break;
616 }
617 currentTimer->flags = GBATimerFlagsTestFillCountUp(currentTimer->flags, timer > 0 && (control & 0x0004));
618 currentTimer->flags = GBATimerFlagsTestFillDoIrq(currentTimer->flags, control & 0x0040);
619 currentTimer->overflowInterval = (0x10000 - currentTimer->reload) << GBATimerFlagsGetPrescaleBits(currentTimer->flags);
620 bool wasEnabled = GBATimerFlagsIsEnable(currentTimer->flags);
621 currentTimer->flags = GBATimerFlagsTestFillEnable(currentTimer->flags, control & 0x0080);
622 if (!wasEnabled && GBATimerFlagsIsEnable(currentTimer->flags)) {
623 if (!GBATimerFlagsIsCountUp(currentTimer->flags)) {
624 currentTimer->nextEvent = gba->cpu->cycles + currentTimer->overflowInterval;
625 } else {
626 currentTimer->nextEvent = INT_MAX;
627 }
628 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->reload;
629 currentTimer->oldReload = currentTimer->reload;
630 currentTimer->lastEvent = gba->cpu->cycles;
631 gba->timersEnabled |= 1 << timer;
632 } else if (wasEnabled && !GBATimerFlagsIsEnable(currentTimer->flags)) {
633 if (!GBATimerFlagsIsCountUp(currentTimer->flags)) {
634 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> oldPrescale);
635 }
636 gba->timersEnabled &= ~(1 << timer);
637 } else if (GBATimerFlagsGetPrescaleBits(currentTimer->flags) != oldPrescale && !GBATimerFlagsIsCountUp(currentTimer->flags)) {
638 // FIXME: this might be before present
639 currentTimer->nextEvent = currentTimer->lastEvent + currentTimer->overflowInterval;
640 }
641
642 if (currentTimer->nextEvent < gba->cpu->nextEvent) {
643 gba->cpu->nextEvent = currentTimer->nextEvent;
644 }
645};
646
647void GBAWriteIE(struct GBA* gba, uint16_t value) {
648 if (value & (1 << IRQ_KEYPAD)) {
649 mLOG(GBA, STUB, "Keypad interrupts not implemented");
650 }
651
652 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
653 ARMRaiseIRQ(gba->cpu);
654 }
655}
656
657void GBAWriteIME(struct GBA* gba, uint16_t value) {
658 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
659 ARMRaiseIRQ(gba->cpu);
660 }
661}
662
663void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
664 gba->memory.io[REG_IF >> 1] |= 1 << irq;
665 gba->cpu->halted = 0;
666
667 if (gba->memory.io[REG_IME >> 1] && (gba->memory.io[REG_IE >> 1] & 1 << irq)) {
668 ARMRaiseIRQ(gba->cpu);
669 }
670}
671
672void GBATestIRQ(struct ARMCore* cpu) {
673 struct GBA* gba = (struct GBA*) cpu->master;
674 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
675 gba->springIRQ = 1;
676 gba->cpu->nextEvent = gba->cpu->cycles;
677 }
678}
679
680void GBAHalt(struct GBA* gba) {
681 gba->cpu->nextEvent = gba->cpu->cycles;
682 gba->cpu->halted = 1;
683}
684
685void GBAStop(struct GBA* gba) {
686 if (!gba->stopCallback) {
687 return;
688 }
689 gba->cpu->nextEvent = gba->cpu->cycles;
690 gba->stopCallback->stop(gba->stopCallback);
691}
692
693void GBADebug(struct GBA* gba, uint16_t flags) {
694 gba->debugFlags = flags;
695 if (GBADebugFlagsIsSend(gba->debugFlags)) {
696 int level = 1 << GBADebugFlagsGetLevel(gba->debugFlags);
697 level &= 0x1F;
698 char oolBuf[0x101];
699 strncpy(oolBuf, gba->debugString, sizeof(gba->debugString));
700 oolBuf[0x100] = '\0';
701 mLog(_mLOG_CAT_GBA_DEBUG(), level, "%s", oolBuf);
702 }
703 gba->debugFlags = GBADebugFlagsClearSend(gba->debugFlags);
704}
705
706bool GBAIsROM(struct VFile* vf) {
707 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
708 return false;
709 }
710 uint8_t signature[sizeof(GBA_ROM_MAGIC)];
711 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
712 return false;
713 }
714 if (GBAIsBIOS(vf)) {
715 return false;
716 }
717 return memcmp(signature, GBA_ROM_MAGIC, sizeof(signature)) == 0;
718}
719
720bool GBAIsMB(struct VFile* vf) {
721 if (!GBAIsROM(vf)) {
722 return false;
723 }
724 if (vf->size(vf) > SIZE_WORKING_RAM) {
725 return false;
726 }
727 if (vf->seek(vf, GBA_MB_MAGIC_OFFSET, SEEK_SET) < 0) {
728 return false;
729 }
730 uint32_t signature;
731 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
732 return false;
733 }
734 uint32_t opcode;
735 LOAD_32(opcode, 0, &signature);
736 struct ARMInstructionInfo info;
737 ARMDecodeARM(opcode, &info);
738 if (info.branchType != ARM_BRANCH) {
739 return false;
740 }
741 if (info.op1.immediate <= 0) {
742 return false;
743 } else if (info.op1.immediate == 28) {
744 // Ancient toolchain that is known to throw MB detection for a loop
745 return false;
746 } else if (info.op1.immediate != 24) {
747 return true;
748 }
749 // Found a libgba-linked cart...these are a bit harder to detect.
750 return false;
751}
752
753bool GBAIsBIOS(struct VFile* vf) {
754 if (vf->seek(vf, 0, SEEK_SET) < 0) {
755 return false;
756 }
757 uint8_t interruptTable[7 * 4];
758 if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
759 return false;
760 }
761 int i;
762 for (i = 0; i < 7; ++i) {
763 if (interruptTable[4 * i + 3] != 0xEA || interruptTable[4 * i + 2]) {
764 return false;
765 }
766 }
767 return true;
768}
769
770void GBAGetGameCode(const struct GBA* gba, char* out) {
771 memset(out, 0, 8);
772 if (!gba->memory.rom) {
773 return;
774 }
775
776 memcpy(out, "AGB-", 4);
777 memcpy(&out[4], &((struct GBACartridge*) gba->memory.rom)->id, 4);
778}
779
780void GBAGetGameTitle(const struct GBA* gba, char* out) {
781 if (gba->memory.rom) {
782 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
783 return;
784 }
785 if (gba->pristineRom) {
786 memcpy(out, &((struct GBACartridge*) gba->pristineRom)->title, 12);
787 return;
788 }
789 strncpy(out, "(BIOS)", 12);
790}
791
792void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
793 struct GBA* gba = (struct GBA*) cpu->master;
794 if (gba->debugger) {
795 struct mDebuggerEntryInfo info = {
796 .address = _ARMPCAddress(cpu),
797 .opcode = opcode
798 };
799 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_ILLEGAL_OP, &info);
800 }
801 // TODO: More sensible category?
802 mLOG(GBA, ERROR, "Stub opcode: %08x", opcode);
803}
804
805void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
806 struct GBA* gba = (struct GBA*) cpu->master;
807 if (!gba->yankedRomSize) {
808 // TODO: More sensible category?
809 mLOG(GBA, WARN, "Illegal opcode: %08x", opcode);
810 }
811 if (gba->debugger) {
812 struct mDebuggerEntryInfo info = {
813 .address = _ARMPCAddress(cpu),
814 .opcode = opcode
815 };
816 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_ILLEGAL_OP, &info);
817 } else {
818 ARMRaiseUndefined(cpu);
819 }
820}
821
822void GBABreakpoint(struct ARMCore* cpu, int immediate) {
823 struct GBA* gba = (struct GBA*) cpu->master;
824 if (immediate >= CPU_COMPONENT_MAX) {
825 return;
826 }
827 switch (immediate) {
828 case CPU_COMPONENT_DEBUGGER:
829 if (gba->debugger) {
830 struct mDebuggerEntryInfo info = {
831 .address = _ARMPCAddress(cpu),
832 .breakType = BREAKPOINT_SOFTWARE
833 };
834 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_BREAKPOINT, &info);
835 }
836 break;
837 case CPU_COMPONENT_CHEAT_DEVICE:
838 if (gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
839 struct mCheatDevice* device = (struct mCheatDevice*) gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
840 struct GBACheatHook* hook = 0;
841 size_t i;
842 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
843 struct GBACheatSet* cheats = (struct GBACheatSet*) *mCheatSetsGetPointer(&device->cheats, i);
844 if (cheats->hook && cheats->hook->address == _ARMPCAddress(cpu)) {
845 mCheatRefresh(device, &cheats->d);
846 hook = cheats->hook;
847 }
848 }
849 if (hook) {
850 ARMRunFake(cpu, hook->patchedOpcode);
851 }
852 }
853 break;
854 default:
855 break;
856 }
857}
858
859void GBAFrameStarted(struct GBA* gba) {
860 UNUSED(gba);
861
862 struct mCoreCallbacks* callbacks = gba->coreCallbacks;
863 if (callbacks && callbacks->videoFrameStarted) {
864 callbacks->videoFrameStarted(callbacks->context);
865 }
866}
867
868void GBAFrameEnded(struct GBA* gba) {
869 GBASavedataClean(&gba->memory.savedata, gba->video.frameCounter);
870
871 if (gba->rr) {
872 gba->rr->nextFrame(gba->rr);
873 }
874
875 if (gba->cpu->components && gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
876 struct mCheatDevice* device = (struct mCheatDevice*) gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
877 size_t i;
878 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
879 struct GBACheatSet* cheats = (struct GBACheatSet*) *mCheatSetsGetPointer(&device->cheats, i);
880 mCheatRefresh(device, &cheats->d);
881 }
882 }
883
884 if (gba->stream && gba->stream->postVideoFrame) {
885 const color_t* pixels;
886 size_t stride;
887 gba->video.renderer->getPixels(gba->video.renderer, &stride, (const void**) &pixels);
888 gba->stream->postVideoFrame(gba->stream, pixels, stride);
889 }
890
891 if (gba->memory.hw.devices & (HW_GB_PLAYER | HW_GB_PLAYER_DETECTION)) {
892 GBAHardwarePlayerUpdate(gba);
893 }
894
895 struct mCoreCallbacks* callbacks = gba->coreCallbacks;
896 if (callbacks && callbacks->videoFrameEnded) {
897 callbacks->videoFrameEnded(callbacks->context);
898 }
899}
900
901void GBASetBreakpoint(struct GBA* gba, struct mCPUComponent* component, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
902 size_t immediate;
903 for (immediate = 0; immediate < gba->cpu->numComponents; ++immediate) {
904 if (gba->cpu->components[immediate] == component) {
905 break;
906 }
907 }
908 if (immediate == gba->cpu->numComponents) {
909 return;
910 }
911 if (mode == MODE_ARM) {
912 int32_t value;
913 int32_t old;
914 value = 0xE1200070;
915 value |= immediate & 0xF;
916 value |= (immediate & 0xFFF0) << 4;
917 GBAPatch32(gba->cpu, address, value, &old);
918 *opcode = old;
919 } else {
920 int16_t value;
921 int16_t old;
922 value = 0xBE00;
923 value |= immediate & 0xFF;
924 GBAPatch16(gba->cpu, address, value, &old);
925 *opcode = (uint16_t) old;
926 }
927}
928
929void GBAClearBreakpoint(struct GBA* gba, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
930 if (mode == MODE_ARM) {
931 GBAPatch32(gba->cpu, address, opcode, 0);
932 } else {
933 GBAPatch16(gba->cpu, address, opcode, 0);
934 }
935}
936
937static bool _setSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
938 GBASetBreakpoint((struct GBA*) debugger->cpu->master, &debugger->d.p->d, address, mode, opcode);
939 return true;
940}
941
942static bool _clearSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
943 GBAClearBreakpoint((struct GBA*) debugger->cpu->master, address, mode, opcode);
944 return true;
945}