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/isa-inlines.h"
12
13#include "gba/bios.h"
14#include "gba/cheats.h"
15#include "gba/context/overrides.h"
16#include "gba/io.h"
17#include "gba/rr/rr.h"
18#include "gba/serialize.h"
19#include "gba/sio.h"
20
21#include "util/crc32.h"
22#include "util/memory.h"
23#include "util/math.h"
24#include "util/patch.h"
25#include "util/vfs.h"
26
27mLOG_DEFINE_CATEGORY(GBA, "GBA");
28
29const uint32_t GBA_ARM7TDMI_FREQUENCY = 0x1000000;
30const uint32_t GBA_COMPONENT_MAGIC = 0x1000000;
31
32static const size_t GBA_ROM_MAGIC_OFFSET = 3;
33static const uint8_t GBA_ROM_MAGIC[] = { 0xEA };
34
35static const size_t GBA_MB_MAGIC_OFFSET = 0xC0;
36
37static void GBAInit(void* cpu, struct mCPUComponent* component);
38static void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh);
39static void GBAProcessEvents(struct ARMCore* cpu);
40static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles);
41static void GBAHitStub(struct ARMCore* cpu, uint32_t opcode);
42static void GBAIllegal(struct ARMCore* cpu, uint32_t opcode);
43static void GBABreakpoint(struct ARMCore* cpu, int immediate);
44
45static bool _setSoftwareBreakpoint(struct Debugger*, uint32_t address, enum ExecutionMode mode, uint32_t* opcode);
46static bool _clearSoftwareBreakpoint(struct Debugger*, uint32_t address, enum ExecutionMode mode, uint32_t opcode);
47
48
49#ifdef _3DS
50extern uint32_t* romBuffer;
51extern size_t romBufferSize;
52#endif
53
54void GBACreate(struct GBA* gba) {
55 gba->d.id = GBA_COMPONENT_MAGIC;
56 gba->d.init = GBAInit;
57 gba->d.deinit = 0;
58}
59
60static void GBAInit(void* cpu, struct mCPUComponent* component) {
61 struct GBA* gba = (struct GBA*) component;
62 gba->cpu = cpu;
63 gba->debugger = 0;
64 gba->sync = 0;
65
66 GBAInterruptHandlerInit(&gba->cpu->irqh);
67 GBAMemoryInit(gba);
68 GBASavedataInit(&gba->memory.savedata, 0);
69
70 gba->video.p = gba;
71 GBAVideoInit(&gba->video);
72
73 gba->audio.p = gba;
74 GBAAudioInit(&gba->audio, GBA_AUDIO_SAMPLES);
75
76 GBAIOInit(gba);
77
78 gba->sio.p = gba;
79 GBASIOInit(&gba->sio);
80
81 gba->timersEnabled = 0;
82 memset(gba->timers, 0, sizeof(gba->timers));
83
84 gba->springIRQ = 0;
85 gba->keySource = 0;
86 gba->rotationSource = 0;
87 gba->luminanceSource = 0;
88 gba->rtcSource = 0;
89 gba->rumble = 0;
90 gba->rr = 0;
91
92 gba->romVf = 0;
93 gba->biosVf = 0;
94
95 gba->stream = 0;
96 gba->keyCallback = 0;
97 gba->stopCallback = 0;
98
99 gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
100
101 gba->idleOptimization = IDLE_LOOP_REMOVE;
102 gba->idleLoop = IDLE_LOOP_NONE;
103
104 gba->realisticTiming = true;
105 gba->hardCrash = true;
106 gba->allowOpposingDirections = true;
107
108 gba->performingDMA = false;
109
110 gba->pristineRom = 0;
111 gba->pristineRomSize = 0;
112 gba->yankedRomSize = 0;
113}
114
115void GBAUnloadROM(struct GBA* gba) {
116 if (gba->memory.rom && gba->pristineRom != gba->memory.rom) {
117 if (gba->yankedRomSize) {
118 gba->yankedRomSize = 0;
119 }
120 mappedMemoryFree(gba->memory.rom, SIZE_CART0);
121 }
122 gba->memory.rom = 0;
123
124 if (gba->romVf) {
125#ifndef _3DS
126 gba->romVf->unmap(gba->romVf, gba->pristineRom, gba->pristineRomSize);
127#endif
128 gba->pristineRom = 0;
129 gba->romVf = 0;
130 }
131
132 GBASavedataDeinit(&gba->memory.savedata);
133 gba->idleLoop = IDLE_LOOP_NONE;
134}
135
136void GBADestroy(struct GBA* gba) {
137 GBAUnloadROM(gba);
138
139 if (gba->biosVf) {
140 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
141 }
142
143 GBAMemoryDeinit(gba);
144 GBAVideoDeinit(&gba->video);
145 GBAAudioDeinit(&gba->audio);
146 GBASIODeinit(&gba->sio);
147 gba->rr = 0;
148}
149
150void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
151 irqh->reset = GBAReset;
152 irqh->processEvents = GBAProcessEvents;
153 irqh->swi16 = GBASwi16;
154 irqh->swi32 = GBASwi32;
155 irqh->hitIllegal = GBAIllegal;
156 irqh->readCPSR = GBATestIRQ;
157 irqh->hitStub = GBAHitStub;
158 irqh->bkpt16 = GBABreakpoint;
159 irqh->bkpt32 = GBABreakpoint;
160}
161
162void GBAReset(struct ARMCore* cpu) {
163 ARMSetPrivilegeMode(cpu, MODE_IRQ);
164 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
165 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
166 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
167 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
168 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
169
170 struct GBA* gba = (struct GBA*) cpu->master;
171 if (!gba->rr || (!gba->rr->isPlaying(gba->rr) && !gba->rr->isRecording(gba->rr))) {
172 GBASavedataUnmask(&gba->memory.savedata);
173 }
174
175 if (gba->yankedRomSize) {
176 gba->memory.romSize = gba->yankedRomSize;
177 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
178 gba->yankedRomSize = 0;
179 }
180 GBAMemoryReset(gba);
181 GBAVideoReset(&gba->video);
182 GBAAudioReset(&gba->audio);
183 GBAIOInit(gba);
184
185 GBASIOReset(&gba->sio);
186
187 gba->timersEnabled = 0;
188 memset(gba->timers, 0, sizeof(gba->timers));
189
190 gba->lastJump = 0;
191 gba->haltPending = false;
192 gba->idleDetectionStep = 0;
193 gba->idleDetectionFailures = 0;
194}
195
196void GBASkipBIOS(struct GBA* gba) {
197 struct ARMCore* cpu = gba->cpu;
198 if (cpu->gprs[ARM_PC] == BASE_RESET + WORD_SIZE_ARM) {
199 if (gba->memory.rom) {
200 cpu->gprs[ARM_PC] = BASE_CART0;
201 } else {
202 cpu->gprs[ARM_PC] = BASE_WORKING_RAM;
203 }
204 int currentCycles = 0;
205 ARM_WRITE_PC;
206 }
207}
208
209static void GBAProcessEvents(struct ARMCore* cpu) {
210 struct GBA* gba = (struct GBA*) cpu->master;
211
212 gba->bus = cpu->prefetch[1];
213 if (cpu->executionMode == MODE_THUMB) {
214 gba->bus |= cpu->prefetch[1] << 16;
215 }
216
217 if (gba->springIRQ) {
218 ARMRaiseIRQ(cpu);
219 gba->springIRQ = 0;
220 }
221
222 do {
223 int32_t cycles = cpu->nextEvent;
224 int32_t nextEvent = INT_MAX;
225 int32_t testEvent;
226#ifndef NDEBUG
227 if (cycles < 0) {
228 mLOG(GBA, FATAL, "Negative cycles passed: %i", cycles);
229 }
230#endif
231
232 testEvent = GBAVideoProcessEvents(&gba->video, cycles);
233 if (testEvent < nextEvent) {
234 nextEvent = testEvent;
235 }
236
237 testEvent = GBAAudioProcessEvents(&gba->audio, cycles);
238 if (testEvent < nextEvent) {
239 nextEvent = testEvent;
240 }
241
242 testEvent = GBATimersProcessEvents(gba, cycles);
243 if (testEvent < nextEvent) {
244 nextEvent = testEvent;
245 }
246
247 testEvent = GBAMemoryRunDMAs(gba, cycles);
248 if (testEvent < nextEvent) {
249 nextEvent = testEvent;
250 }
251
252 testEvent = GBASIOProcessEvents(&gba->sio, cycles);
253 if (testEvent < nextEvent) {
254 nextEvent = testEvent;
255 }
256
257 cpu->cycles -= cycles;
258 cpu->nextEvent = nextEvent;
259
260 if (cpu->halted) {
261 cpu->cycles = cpu->nextEvent;
262 }
263 } while (cpu->cycles >= cpu->nextEvent);
264}
265
266static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
267 int32_t nextEvent = INT_MAX;
268 if (gba->timersEnabled) {
269 struct GBATimer* timer;
270 struct GBATimer* nextTimer;
271
272 timer = &gba->timers[0];
273 if (GBATimerFlagsIsEnable(timer->flags)) {
274 timer->nextEvent -= cycles;
275 timer->lastEvent -= cycles;
276 while (timer->nextEvent <= 0) {
277 timer->lastEvent = timer->nextEvent;
278 timer->nextEvent += timer->overflowInterval;
279 gba->memory.io[REG_TM0CNT_LO >> 1] = timer->reload;
280 timer->oldReload = timer->reload;
281
282 if (GBATimerFlagsIsDoIrq(timer->flags)) {
283 GBARaiseIRQ(gba, IRQ_TIMER0);
284 }
285
286 if (gba->audio.enable) {
287 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
288 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
289 }
290
291 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
292 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
293 }
294 }
295
296 nextTimer = &gba->timers[1];
297 if (GBATimerFlagsIsCountUp(nextTimer->flags)) {
298 ++gba->memory.io[REG_TM1CNT_LO >> 1];
299 if (!gba->memory.io[REG_TM1CNT_LO >> 1]) {
300 nextTimer->nextEvent = 0;
301 }
302 }
303 }
304 nextEvent = timer->nextEvent;
305 }
306
307 timer = &gba->timers[1];
308 if (GBATimerFlagsIsEnable(timer->flags)) {
309 timer->nextEvent -= cycles;
310 timer->lastEvent -= cycles;
311 if (timer->nextEvent <= 0) {
312 timer->lastEvent = timer->nextEvent;
313 timer->nextEvent += timer->overflowInterval;
314 gba->memory.io[REG_TM1CNT_LO >> 1] = timer->reload;
315 timer->oldReload = timer->reload;
316
317 if (GBATimerFlagsIsDoIrq(timer->flags)) {
318 GBARaiseIRQ(gba, IRQ_TIMER1);
319 }
320
321 if (gba->audio.enable) {
322 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
323 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
324 }
325
326 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
327 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
328 }
329 }
330
331 if (GBATimerFlagsIsCountUp(timer->flags)) {
332 timer->nextEvent = INT_MAX;
333 }
334
335 nextTimer = &gba->timers[2];
336 if (GBATimerFlagsIsCountUp(nextTimer->flags)) {
337 ++gba->memory.io[REG_TM2CNT_LO >> 1];
338 if (!gba->memory.io[REG_TM2CNT_LO >> 1]) {
339 nextTimer->nextEvent = 0;
340 }
341 }
342 }
343 if (timer->nextEvent < nextEvent) {
344 nextEvent = timer->nextEvent;
345 }
346 }
347
348 timer = &gba->timers[2];
349 if (GBATimerFlagsIsEnable(timer->flags)) {
350 timer->nextEvent -= cycles;
351 timer->lastEvent -= cycles;
352 if (timer->nextEvent <= 0) {
353 timer->lastEvent = timer->nextEvent;
354 timer->nextEvent += timer->overflowInterval;
355 gba->memory.io[REG_TM2CNT_LO >> 1] = timer->reload;
356 timer->oldReload = timer->reload;
357
358 if (GBATimerFlagsIsDoIrq(timer->flags)) {
359 GBARaiseIRQ(gba, IRQ_TIMER2);
360 }
361
362 if (GBATimerFlagsIsCountUp(timer->flags)) {
363 timer->nextEvent = INT_MAX;
364 }
365
366 nextTimer = &gba->timers[3];
367 if (GBATimerFlagsIsCountUp(nextTimer->flags)) {
368 ++gba->memory.io[REG_TM3CNT_LO >> 1];
369 if (!gba->memory.io[REG_TM3CNT_LO >> 1]) {
370 nextTimer->nextEvent = 0;
371 }
372 }
373 }
374 if (timer->nextEvent < nextEvent) {
375 nextEvent = timer->nextEvent;
376 }
377 }
378
379 timer = &gba->timers[3];
380 if (GBATimerFlagsIsEnable(timer->flags)) {
381 timer->nextEvent -= cycles;
382 timer->lastEvent -= cycles;
383 if (timer->nextEvent <= 0) {
384 timer->lastEvent = timer->nextEvent;
385 timer->nextEvent += timer->overflowInterval;
386 gba->memory.io[REG_TM3CNT_LO >> 1] = timer->reload;
387 timer->oldReload = timer->reload;
388
389 if (GBATimerFlagsIsDoIrq(timer->flags)) {
390 GBARaiseIRQ(gba, IRQ_TIMER3);
391 }
392
393 if (GBATimerFlagsIsCountUp(timer->flags)) {
394 timer->nextEvent = INT_MAX;
395 }
396 }
397 if (timer->nextEvent < nextEvent) {
398 nextEvent = timer->nextEvent;
399 }
400 }
401 }
402 return nextEvent;
403}
404
405void GBAAttachDebugger(struct GBA* gba, struct Debugger* debugger) {
406 debugger->setSoftwareBreakpoint = _setSoftwareBreakpoint;
407 debugger->clearSoftwareBreakpoint = _clearSoftwareBreakpoint;
408 gba->debugger = debugger;
409 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = &debugger->d;
410 ARMHotplugAttach(gba->cpu, GBA_COMPONENT_DEBUGGER);
411}
412
413void GBADetachDebugger(struct GBA* gba) {
414 gba->debugger = 0;
415 ARMHotplugDetach(gba->cpu, GBA_COMPONENT_DEBUGGER);
416 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = 0;
417}
418
419bool GBALoadMB(struct GBA* gba, struct VFile* vf) {
420 GBAUnloadROM(gba);
421 gba->romVf = vf;
422 gba->pristineRomSize = vf->size(vf);
423 vf->seek(vf, 0, SEEK_SET);
424 if (gba->pristineRomSize > SIZE_WORKING_RAM) {
425 gba->pristineRomSize = SIZE_WORKING_RAM;
426 }
427#ifdef _3DS
428 gba->pristineRom = 0;
429 if (gba->pristineRomSize <= romBufferSize) {
430 gba->pristineRom = romBuffer;
431 vf->read(vf, romBuffer, gba->pristineRomSize);
432 }
433#else
434 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
435#endif
436 if (!gba->pristineRom) {
437 mLOG(GBA, WARN, "Couldn't map ROM");
438 return false;
439 }
440 gba->yankedRomSize = 0;
441 gba->memory.romSize = 0;
442 gba->memory.romMask = 0;
443 gba->romCrc32 = doCrc32(gba->pristineRom, gba->pristineRomSize);
444 return true;
445}
446
447bool GBALoadROM(struct GBA* gba, struct VFile* vf) {
448 GBAUnloadROM(gba);
449 gba->romVf = vf;
450 gba->pristineRomSize = vf->size(vf);
451 vf->seek(vf, 0, SEEK_SET);
452 if (gba->pristineRomSize > SIZE_CART0) {
453 gba->pristineRomSize = SIZE_CART0;
454 }
455#ifdef _3DS
456 gba->pristineRom = 0;
457 if (gba->pristineRomSize <= romBufferSize) {
458 gba->pristineRom = romBuffer;
459 vf->read(vf, romBuffer, gba->pristineRomSize);
460 }
461#else
462 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
463#endif
464 if (!gba->pristineRom) {
465 mLOG(GBA, WARN, "Couldn't map ROM");
466 return false;
467 }
468 gba->yankedRomSize = 0;
469 gba->memory.rom = gba->pristineRom;
470 gba->memory.romSize = gba->pristineRomSize;
471 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
472 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
473 GBAHardwareInit(&gba->memory.hw, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
474 // TODO: error check
475 return true;
476}
477
478bool GBALoadSave(struct GBA* gba, struct VFile* sav) {
479 GBASavedataInit(&gba->memory.savedata, sav);
480 return true;
481}
482
483void GBAYankROM(struct GBA* gba) {
484 gba->yankedRomSize = gba->memory.romSize;
485 gba->memory.romSize = 0;
486 gba->memory.romMask = 0;
487 GBARaiseIRQ(gba, IRQ_GAMEPAK);
488}
489
490void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
491 gba->biosVf = vf;
492 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
493 if (!bios) {
494 mLOG(GBA, WARN, "Couldn't map BIOS");
495 return;
496 }
497 gba->memory.bios = bios;
498 gba->memory.fullBios = 1;
499 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
500 mLOG(GBA, DEBUG, "BIOS Checksum: 0x%X", checksum);
501 if (checksum == GBA_BIOS_CHECKSUM) {
502 mLOG(GBA, INFO, "Official GBA BIOS detected");
503 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
504 mLOG(GBA, INFO, "Official GBA (DS) BIOS detected");
505 } else {
506 mLOG(GBA, WARN, "BIOS checksum incorrect");
507 }
508 gba->biosChecksum = checksum;
509 if (gba->memory.activeRegion == REGION_BIOS) {
510 gba->cpu->memory.activeRegion = gba->memory.bios;
511 }
512 // TODO: error check
513}
514
515void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
516 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
517 if (!patchedSize || patchedSize > SIZE_CART0) {
518 return;
519 }
520 gba->memory.rom = anonymousMemoryMap(SIZE_CART0);
521 if (!patch->applyPatch(patch, gba->pristineRom, gba->pristineRomSize, gba->memory.rom, patchedSize)) {
522 mappedMemoryFree(gba->memory.rom, patchedSize);
523 gba->memory.rom = gba->pristineRom;
524 return;
525 }
526 gba->memory.romSize = patchedSize;
527 gba->memory.romMask = SIZE_CART0 - 1;
528 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
529}
530
531void GBATimerUpdateRegister(struct GBA* gba, int timer) {
532 struct GBATimer* currentTimer = &gba->timers[timer];
533 if (GBATimerFlagsIsEnable(currentTimer->flags) && !GBATimerFlagsIsCountUp(currentTimer->flags)) {
534 int32_t prefetchSkew = 0;
535 if (gba->memory.lastPrefetchedPc - gba->memory.lastPrefetchedLoads * WORD_SIZE_THUMB >= (uint32_t) gba->cpu->gprs[ARM_PC]) {
536 prefetchSkew = (gba->memory.lastPrefetchedPc - gba->cpu->gprs[ARM_PC]) * (gba->cpu->memory.activeSeqCycles16 + 1) / WORD_SIZE_THUMB;
537 }
538 // Reading this takes two cycles (1N+1I), so let's remove them preemptively
539 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent - 2 + prefetchSkew) >> GBATimerFlagsGetPrescaleBits(currentTimer->flags));
540 }
541}
542
543void GBATimerWriteTMCNT_LO(struct GBA* gba, int timer, uint16_t reload) {
544 gba->timers[timer].reload = reload;
545 gba->timers[timer].overflowInterval = (0x10000 - gba->timers[timer].reload) << GBATimerFlagsGetPrescaleBits(gba->timers[timer].flags);
546}
547
548void GBATimerWriteTMCNT_HI(struct GBA* gba, int timer, uint16_t control) {
549 struct GBATimer* currentTimer = &gba->timers[timer];
550 GBATimerUpdateRegister(gba, timer);
551
552 unsigned oldPrescale = GBATimerFlagsGetPrescaleBits(currentTimer->flags);
553 switch (control & 0x0003) {
554 case 0x0000:
555 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 0);
556 break;
557 case 0x0001:
558 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 6);
559 break;
560 case 0x0002:
561 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 8);
562 break;
563 case 0x0003:
564 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 10);
565 break;
566 }
567 currentTimer->flags = GBATimerFlagsTestFillCountUp(currentTimer->flags, control & 0x0004);
568 currentTimer->flags = GBATimerFlagsTestFillDoIrq(currentTimer->flags, control & 0x0040);
569 currentTimer->overflowInterval = (0x10000 - currentTimer->reload) << GBATimerFlagsGetPrescaleBits(currentTimer->flags);
570 bool wasEnabled = GBATimerFlagsIsEnable(currentTimer->flags);
571 currentTimer->flags = GBATimerFlagsTestFillEnable(currentTimer->flags, control & 0x0080);
572 if (!wasEnabled && GBATimerFlagsIsEnable(currentTimer->flags)) {
573 if (!GBATimerFlagsIsCountUp(currentTimer->flags)) {
574 currentTimer->nextEvent = gba->cpu->cycles + currentTimer->overflowInterval;
575 } else {
576 currentTimer->nextEvent = INT_MAX;
577 }
578 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->reload;
579 currentTimer->oldReload = currentTimer->reload;
580 currentTimer->lastEvent = gba->cpu->cycles;
581 gba->timersEnabled |= 1 << timer;
582 } else if (wasEnabled && !GBATimerFlagsIsEnable(currentTimer->flags)) {
583 if (!GBATimerFlagsIsCountUp(currentTimer->flags)) {
584 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> oldPrescale);
585 }
586 gba->timersEnabled &= ~(1 << timer);
587 } else if (GBATimerFlagsGetPrescaleBits(currentTimer->flags) != oldPrescale && !GBATimerFlagsIsCountUp(currentTimer->flags)) {
588 // FIXME: this might be before present
589 currentTimer->nextEvent = currentTimer->lastEvent + currentTimer->overflowInterval;
590 }
591
592 if (currentTimer->nextEvent < gba->cpu->nextEvent) {
593 gba->cpu->nextEvent = currentTimer->nextEvent;
594 }
595};
596
597void GBAWriteIE(struct GBA* gba, uint16_t value) {
598 if (value & (1 << IRQ_KEYPAD)) {
599 mLOG(GBA, STUB, "Keypad interrupts not implemented");
600 }
601
602 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
603 ARMRaiseIRQ(gba->cpu);
604 }
605}
606
607void GBAWriteIME(struct GBA* gba, uint16_t value) {
608 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
609 ARMRaiseIRQ(gba->cpu);
610 }
611}
612
613void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
614 gba->memory.io[REG_IF >> 1] |= 1 << irq;
615 gba->cpu->halted = 0;
616
617 if (gba->memory.io[REG_IME >> 1] && (gba->memory.io[REG_IE >> 1] & 1 << irq)) {
618 ARMRaiseIRQ(gba->cpu);
619 }
620}
621
622void GBATestIRQ(struct ARMCore* cpu) {
623 struct GBA* gba = (struct GBA*) cpu->master;
624 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
625 gba->springIRQ = 1;
626 gba->cpu->nextEvent = gba->cpu->cycles;
627 }
628}
629
630void GBAHalt(struct GBA* gba) {
631 gba->cpu->nextEvent = gba->cpu->cycles;
632 gba->cpu->halted = 1;
633}
634
635void GBAStop(struct GBA* gba) {
636 if (!gba->stopCallback) {
637 return;
638 }
639 gba->cpu->nextEvent = gba->cpu->cycles;
640 gba->stopCallback->stop(gba->stopCallback);
641}
642
643bool GBAIsROM(struct VFile* vf) {
644 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
645 return false;
646 }
647 uint8_t signature[sizeof(GBA_ROM_MAGIC)];
648 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
649 return false;
650 }
651 if (GBAIsBIOS(vf)) {
652 return false;
653 }
654 return memcmp(signature, GBA_ROM_MAGIC, sizeof(signature)) == 0;
655}
656
657bool GBAIsMB(struct VFile* vf) {
658 if (!GBAIsROM(vf)) {
659 return false;
660 }
661 if (vf->size(vf) > SIZE_WORKING_RAM) {
662 return false;
663 }
664 if (vf->seek(vf, GBA_MB_MAGIC_OFFSET, SEEK_SET) < 0) {
665 return false;
666 }
667 uint32_t signature;
668 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
669 return false;
670 }
671 uint32_t opcode;
672 LOAD_32(opcode, 0, &signature);
673 struct ARMInstructionInfo info;
674 ARMDecodeARM(opcode, &info);
675 if (info.branchType != ARM_BRANCH) {
676 return false;
677 }
678 if (info.op1.immediate <= 0) {
679 return false;
680 } else if (info.op1.immediate == 28) {
681 // Ancient toolchain that is known to throw MB detection for a loop
682 return false;
683 } else if (info.op1.immediate != 24) {
684 return true;
685 }
686 // Found a libgba-linked cart...these are a bit harder to detect.
687 return false;
688}
689
690bool GBAIsBIOS(struct VFile* vf) {
691 if (vf->seek(vf, 0, SEEK_SET) < 0) {
692 return false;
693 }
694 uint8_t interruptTable[7 * 4];
695 if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
696 return false;
697 }
698 int i;
699 for (i = 0; i < 7; ++i) {
700 if (interruptTable[4 * i + 3] != 0xEA || interruptTable[4 * i + 2]) {
701 return false;
702 }
703 }
704 return true;
705}
706
707void GBAGetGameCode(struct GBA* gba, char* out) {
708 if (!gba->memory.rom) {
709 out[0] = '\0';
710 return;
711 }
712 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->id, 4);
713}
714
715void GBAGetGameTitle(struct GBA* gba, char* out) {
716 if (gba->memory.rom) {
717 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
718 return;
719 }
720 if (gba->pristineRom) {
721 memcpy(out, &((struct GBACartridge*) gba->pristineRom)->title, 12);
722 return;
723 }
724 strncpy(out, "(BIOS)", 12);
725}
726
727void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
728 struct GBA* gba = (struct GBA*) cpu->master;
729 if (gba->debugger) {
730 struct DebuggerEntryInfo info = {
731 .address = _ARMPCAddress(cpu),
732 .opcode = opcode
733 };
734 DebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP, &info);
735 }
736 // TODO: More sensible category?
737 mLOG(GBA, ERROR, "Stub opcode: %08x", opcode);
738}
739
740void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
741 struct GBA* gba = (struct GBA*) cpu->master;
742 if (!gba->yankedRomSize) {
743 // TODO: More sensible category?
744 mLOG(GBA, WARN, "Illegal opcode: %08x", opcode);
745 }
746 if (gba->debugger) {
747 struct DebuggerEntryInfo info = {
748 .address = _ARMPCAddress(cpu),
749 .opcode = opcode
750 };
751 DebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP, &info);
752 } else {
753 ARMRaiseUndefined(cpu);
754 }
755}
756
757void GBABreakpoint(struct ARMCore* cpu, int immediate) {
758 struct GBA* gba = (struct GBA*) cpu->master;
759 if (immediate >= GBA_COMPONENT_MAX) {
760 return;
761 }
762 switch (immediate) {
763 case GBA_COMPONENT_DEBUGGER:
764 if (gba->debugger) {
765 struct DebuggerEntryInfo info = {
766 .address = _ARMPCAddress(cpu)
767 };
768 DebuggerEnter(gba->debugger, DEBUGGER_ENTER_BREAKPOINT, &info);
769 }
770 break;
771 case GBA_COMPONENT_CHEAT_DEVICE:
772 if (gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE]) {
773 struct GBACheatDevice* device = (struct GBACheatDevice*) gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE];
774 struct GBACheatHook* hook = 0;
775 size_t i;
776 for (i = 0; i < GBACheatSetsSize(&device->cheats); ++i) {
777 struct GBACheatSet* cheats = *GBACheatSetsGetPointer(&device->cheats, i);
778 if (cheats->hook && cheats->hook->address == _ARMPCAddress(cpu)) {
779 GBACheatRefresh(device, cheats);
780 hook = cheats->hook;
781 }
782 }
783 if (hook) {
784 ARMRunFake(cpu, hook->patchedOpcode);
785 }
786 }
787 break;
788 default:
789 break;
790 }
791}
792
793void GBAFrameStarted(struct GBA* gba) {
794 UNUSED(gba);
795
796 // TODO: Put back rewind
797}
798
799void GBAFrameEnded(struct GBA* gba) {
800 GBASavedataClean(&gba->memory.savedata, gba->video.frameCounter);
801
802 if (gba->rr) {
803 gba->rr->nextFrame(gba->rr);
804 }
805
806 if (gba->cpu->components && gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE]) {
807 struct GBACheatDevice* device = (struct GBACheatDevice*) gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE];
808 size_t i;
809 for (i = 0; i < GBACheatSetsSize(&device->cheats); ++i) {
810 struct GBACheatSet* cheats = *GBACheatSetsGetPointer(&device->cheats, i);
811 if (!cheats->hook) {
812 GBACheatRefresh(device, cheats);
813 }
814 }
815 }
816
817 if (gba->stream && gba->stream->postVideoFrame) {
818 const color_t* pixels;
819 unsigned stride;
820 gba->video.renderer->getPixels(gba->video.renderer, &stride, (const void**) &pixels);
821 gba->stream->postVideoFrame(gba->stream, pixels, stride);
822 }
823
824 if (gba->memory.hw.devices & (HW_GB_PLAYER | HW_GB_PLAYER_DETECTION)) {
825 GBAHardwarePlayerUpdate(gba);
826 }
827
828 struct mCoreThread* thread = mCoreThreadGet();
829 if (!thread) {
830 return;
831 }
832
833 if (thread->frameCallback) {
834 thread->frameCallback(thread);
835 }
836
837 // TODO: Put back RR
838}
839
840void GBASetBreakpoint(struct GBA* gba, struct mCPUComponent* component, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
841 size_t immediate;
842 for (immediate = 0; immediate < gba->cpu->numComponents; ++immediate) {
843 if (gba->cpu->components[immediate] == component) {
844 break;
845 }
846 }
847 if (immediate == gba->cpu->numComponents) {
848 return;
849 }
850 if (mode == MODE_ARM) {
851 int32_t value;
852 int32_t old;
853 value = 0xE1200070;
854 value |= immediate & 0xF;
855 value |= (immediate & 0xFFF0) << 4;
856 GBAPatch32(gba->cpu, address, value, &old);
857 *opcode = old;
858 } else {
859 int16_t value;
860 int16_t old;
861 value = 0xBE00;
862 value |= immediate & 0xFF;
863 GBAPatch16(gba->cpu, address, value, &old);
864 *opcode = (uint16_t) old;
865 }
866}
867
868void GBAClearBreakpoint(struct GBA* gba, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
869 if (mode == MODE_ARM) {
870 GBAPatch32(gba->cpu, address, opcode, 0);
871 } else {
872 GBAPatch16(gba->cpu, address, opcode, 0);
873 }
874}
875
876static bool _setSoftwareBreakpoint(struct Debugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
877 GBASetBreakpoint((struct GBA*) debugger->cpu->master, &debugger->d, address, mode, opcode);
878 return true;
879}
880
881static bool _clearSoftwareBreakpoint(struct Debugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
882 GBAClearBreakpoint((struct GBA*) debugger->cpu->master, address, mode, opcode);
883 return true;
884}