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 "arm/decoder.h"
9#include "arm/isa-inlines.h"
10
11#include "gba/bios.h"
12#include "gba/cheats.h"
13#include "gba/io.h"
14#include "gba/rr/rr.h"
15#include "gba/supervisor/thread.h"
16#include "gba/serialize.h"
17#include "gba/sio.h"
18
19#include "util/crc32.h"
20#include "util/memory.h"
21#include "util/math.h"
22#include "util/patch.h"
23#include "util/vfs.h"
24
25const uint32_t GBA_ARM7TDMI_FREQUENCY = 0x1000000;
26const uint32_t GBA_COMPONENT_MAGIC = 0x1000000;
27
28static const size_t GBA_ROM_MAGIC_OFFSET = 3;
29static const uint8_t GBA_ROM_MAGIC[] = { 0xEA };
30
31static const size_t GBA_MB_MAGIC_OFFSET = 0xC0;
32
33static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component);
34static void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh);
35static void GBAProcessEvents(struct ARMCore* cpu);
36static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles);
37static void GBAHitStub(struct ARMCore* cpu, uint32_t opcode);
38static void GBAIllegal(struct ARMCore* cpu, uint32_t opcode);
39static void GBABreakpoint(struct ARMCore* cpu, int immediate);
40
41static bool _setSoftwareBreakpoint(struct ARMDebugger*, uint32_t address, enum ExecutionMode mode, uint32_t* opcode);
42static bool _clearSoftwareBreakpoint(struct ARMDebugger*, uint32_t address, enum ExecutionMode mode, uint32_t opcode);
43
44
45#ifdef _3DS
46extern uint32_t* romBuffer;
47extern size_t romBufferSize;
48#endif
49
50void GBACreate(struct GBA* gba) {
51 gba->d.id = GBA_COMPONENT_MAGIC;
52 gba->d.init = GBAInit;
53 gba->d.deinit = 0;
54}
55
56static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component) {
57 struct GBA* gba = (struct GBA*) component;
58 gba->cpu = cpu;
59 gba->debugger = 0;
60 gba->sync = 0;
61
62 GBAInterruptHandlerInit(&cpu->irqh);
63 GBAMemoryInit(gba);
64 GBASavedataInit(&gba->memory.savedata, 0);
65
66 gba->video.p = gba;
67 GBAVideoInit(&gba->video);
68
69 gba->audio.p = gba;
70 GBAAudioInit(&gba->audio, GBA_AUDIO_SAMPLES);
71
72 GBAIOInit(gba);
73
74 gba->sio.p = gba;
75 GBASIOInit(&gba->sio);
76
77 gba->timersEnabled = 0;
78 memset(gba->timers, 0, sizeof(gba->timers));
79
80 gba->springIRQ = 0;
81 gba->keySource = 0;
82 gba->rotationSource = 0;
83 gba->luminanceSource = 0;
84 gba->rtcSource = 0;
85 gba->rumble = 0;
86 gba->rr = 0;
87
88 gba->romVf = 0;
89 gba->biosVf = 0;
90
91 gba->logHandler = 0;
92 gba->logLevel = GBA_LOG_WARN | GBA_LOG_ERROR | GBA_LOG_FATAL;
93 gba->stream = 0;
94 gba->keyCallback = 0;
95 gba->stopCallback = 0;
96
97 gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
98
99 gba->idleOptimization = IDLE_LOOP_REMOVE;
100 gba->idleLoop = IDLE_LOOP_NONE;
101
102 gba->realisticTiming = true;
103 gba->hardCrash = true;
104
105 gba->performingDMA = false;
106
107 gba->pristineRom = 0;
108 gba->pristineRomSize = 0;
109 gba->yankedRomSize = 0;
110}
111
112void GBAUnloadROM(struct GBA* gba) {
113 if (gba->memory.rom && gba->pristineRom != gba->memory.rom) {
114 if (gba->yankedRomSize) {
115 gba->yankedRomSize = 0;
116 }
117 mappedMemoryFree(gba->memory.rom, SIZE_CART0);
118 }
119 gba->memory.rom = 0;
120
121 if (gba->romVf) {
122#ifndef _3DS
123 gba->romVf->unmap(gba->romVf, gba->pristineRom, gba->pristineRomSize);
124#endif
125 gba->pristineRom = 0;
126 gba->romVf = 0;
127 }
128
129 GBASavedataDeinit(&gba->memory.savedata);
130 gba->idleLoop = IDLE_LOOP_NONE;
131}
132
133void GBADestroy(struct GBA* gba) {
134 GBAUnloadROM(gba);
135
136 if (gba->biosVf) {
137 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
138 }
139
140 GBAMemoryDeinit(gba);
141 GBAVideoDeinit(&gba->video);
142 GBAAudioDeinit(&gba->audio);
143 GBASIODeinit(&gba->sio);
144 gba->rr = 0;
145}
146
147void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
148 irqh->reset = GBAReset;
149 irqh->processEvents = GBAProcessEvents;
150 irqh->swi16 = GBASwi16;
151 irqh->swi32 = GBASwi32;
152 irqh->hitIllegal = GBAIllegal;
153 irqh->readCPSR = GBATestIRQ;
154 irqh->hitStub = GBAHitStub;
155 irqh->bkpt16 = GBABreakpoint;
156 irqh->bkpt32 = GBABreakpoint;
157}
158
159void GBAReset(struct ARMCore* cpu) {
160 ARMSetPrivilegeMode(cpu, MODE_IRQ);
161 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
162 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
163 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
164 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
165 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
166
167 struct GBA* gba = (struct GBA*) cpu->master;
168 if (!gba->rr || (!gba->rr->isPlaying(gba->rr) && !gba->rr->isRecording(gba->rr))) {
169 GBASavedataUnmask(&gba->memory.savedata);
170 }
171
172 if (gba->yankedRomSize) {
173 gba->memory.romSize = gba->yankedRomSize;
174 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
175 gba->yankedRomSize = 0;
176 }
177 GBAMemoryReset(gba);
178 GBAVideoReset(&gba->video);
179 GBAAudioReset(&gba->audio);
180 GBAIOInit(gba);
181
182 GBASIOReset(&gba->sio);
183
184 gba->timersEnabled = 0;
185 memset(gba->timers, 0, sizeof(gba->timers));
186
187 gba->lastJump = 0;
188 gba->haltPending = false;
189 gba->idleDetectionStep = 0;
190 gba->idleDetectionFailures = 0;
191}
192
193void GBASkipBIOS(struct GBA* gba) {
194 struct ARMCore* cpu = gba->cpu;
195 if (cpu->gprs[ARM_PC] == BASE_RESET + WORD_SIZE_ARM) {
196 if (gba->memory.rom) {
197 cpu->gprs[ARM_PC] = BASE_CART0;
198 } else {
199 cpu->gprs[ARM_PC] = BASE_WORKING_RAM;
200 }
201 int currentCycles = 0;
202 ARM_WRITE_PC;
203 }
204}
205
206static void GBAProcessEvents(struct ARMCore* cpu) {
207 do {
208 struct GBA* gba = (struct GBA*) cpu->master;
209 int32_t cycles = cpu->nextEvent;
210 int32_t nextEvent = INT_MAX;
211 int32_t testEvent;
212#ifndef NDEBUG
213 if (cycles < 0) {
214 GBALog(gba, GBA_LOG_FATAL, "Negative cycles passed: %i", cycles);
215 }
216#endif
217
218 gba->bus = cpu->prefetch[1];
219 if (cpu->executionMode == MODE_THUMB) {
220 gba->bus |= cpu->prefetch[1] << 16;
221 }
222
223 if (gba->springIRQ) {
224 ARMRaiseIRQ(cpu);
225 gba->springIRQ = 0;
226 }
227
228 testEvent = GBAVideoProcessEvents(&gba->video, cycles);
229 if (testEvent < nextEvent) {
230 nextEvent = testEvent;
231 }
232
233 testEvent = GBAAudioProcessEvents(&gba->audio, cycles);
234 if (testEvent < nextEvent) {
235 nextEvent = testEvent;
236 }
237
238 testEvent = GBATimersProcessEvents(gba, cycles);
239 if (testEvent < nextEvent) {
240 nextEvent = testEvent;
241 }
242
243 testEvent = GBAMemoryRunDMAs(gba, cycles);
244 if (testEvent < nextEvent) {
245 nextEvent = testEvent;
246 }
247
248 testEvent = GBASIOProcessEvents(&gba->sio, cycles);
249 if (testEvent < nextEvent) {
250 nextEvent = testEvent;
251 }
252
253 cpu->cycles -= cycles;
254 cpu->nextEvent = nextEvent;
255
256 if (cpu->halted) {
257 cpu->cycles = cpu->nextEvent;
258 }
259 } while (cpu->cycles >= cpu->nextEvent);
260}
261
262static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
263 int32_t nextEvent = INT_MAX;
264 if (gba->timersEnabled) {
265 struct GBATimer* timer;
266 struct GBATimer* nextTimer;
267
268 timer = &gba->timers[0];
269 if (GBATimerFlagsIsEnable(timer->flags)) {
270 timer->nextEvent -= cycles;
271 timer->lastEvent -= cycles;
272 while (timer->nextEvent <= 0) {
273 timer->lastEvent = timer->nextEvent;
274 timer->nextEvent += timer->overflowInterval;
275 gba->memory.io[REG_TM0CNT_LO >> 1] = timer->reload;
276 timer->oldReload = timer->reload;
277
278 if (GBATimerFlagsIsDoIrq(timer->flags)) {
279 GBARaiseIRQ(gba, IRQ_TIMER0);
280 }
281
282 if (gba->audio.enable) {
283 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
284 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
285 }
286
287 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
288 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
289 }
290 }
291
292 nextTimer = &gba->timers[1];
293 if (GBATimerFlagsIsCountUp(nextTimer->flags)) {
294 ++gba->memory.io[REG_TM1CNT_LO >> 1];
295 if (!gba->memory.io[REG_TM1CNT_LO >> 1]) {
296 nextTimer->nextEvent = 0;
297 }
298 }
299 }
300 nextEvent = timer->nextEvent;
301 }
302
303 timer = &gba->timers[1];
304 if (GBATimerFlagsIsEnable(timer->flags)) {
305 timer->nextEvent -= cycles;
306 timer->lastEvent -= cycles;
307 if (timer->nextEvent <= 0) {
308 timer->lastEvent = timer->nextEvent;
309 timer->nextEvent += timer->overflowInterval;
310 gba->memory.io[REG_TM1CNT_LO >> 1] = timer->reload;
311 timer->oldReload = timer->reload;
312
313 if (GBATimerFlagsIsDoIrq(timer->flags)) {
314 GBARaiseIRQ(gba, IRQ_TIMER1);
315 }
316
317 if (gba->audio.enable) {
318 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
319 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
320 }
321
322 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
323 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
324 }
325 }
326
327 if (GBATimerFlagsIsCountUp(timer->flags)) {
328 timer->nextEvent = INT_MAX;
329 }
330
331 nextTimer = &gba->timers[2];
332 if (GBATimerFlagsIsCountUp(nextTimer->flags)) {
333 ++gba->memory.io[REG_TM2CNT_LO >> 1];
334 if (!gba->memory.io[REG_TM2CNT_LO >> 1]) {
335 nextTimer->nextEvent = 0;
336 }
337 }
338 }
339 if (timer->nextEvent < nextEvent) {
340 nextEvent = timer->nextEvent;
341 }
342 }
343
344 timer = &gba->timers[2];
345 if (GBATimerFlagsIsEnable(timer->flags)) {
346 timer->nextEvent -= cycles;
347 timer->lastEvent -= cycles;
348 if (timer->nextEvent <= 0) {
349 timer->lastEvent = timer->nextEvent;
350 timer->nextEvent += timer->overflowInterval;
351 gba->memory.io[REG_TM2CNT_LO >> 1] = timer->reload;
352 timer->oldReload = timer->reload;
353
354 if (GBATimerFlagsIsDoIrq(timer->flags)) {
355 GBARaiseIRQ(gba, IRQ_TIMER2);
356 }
357
358 if (GBATimerFlagsIsCountUp(timer->flags)) {
359 timer->nextEvent = INT_MAX;
360 }
361
362 nextTimer = &gba->timers[3];
363 if (GBATimerFlagsIsCountUp(nextTimer->flags)) {
364 ++gba->memory.io[REG_TM3CNT_LO >> 1];
365 if (!gba->memory.io[REG_TM3CNT_LO >> 1]) {
366 nextTimer->nextEvent = 0;
367 }
368 }
369 }
370 if (timer->nextEvent < nextEvent) {
371 nextEvent = timer->nextEvent;
372 }
373 }
374
375 timer = &gba->timers[3];
376 if (GBATimerFlagsIsEnable(timer->flags)) {
377 timer->nextEvent -= cycles;
378 timer->lastEvent -= cycles;
379 if (timer->nextEvent <= 0) {
380 timer->lastEvent = timer->nextEvent;
381 timer->nextEvent += timer->overflowInterval;
382 gba->memory.io[REG_TM3CNT_LO >> 1] = timer->reload;
383 timer->oldReload = timer->reload;
384
385 if (GBATimerFlagsIsDoIrq(timer->flags)) {
386 GBARaiseIRQ(gba, IRQ_TIMER3);
387 }
388
389 if (GBATimerFlagsIsCountUp(timer->flags)) {
390 timer->nextEvent = INT_MAX;
391 }
392 }
393 if (timer->nextEvent < nextEvent) {
394 nextEvent = timer->nextEvent;
395 }
396 }
397 }
398 return nextEvent;
399}
400
401void GBAAttachDebugger(struct GBA* gba, struct ARMDebugger* debugger) {
402 debugger->setSoftwareBreakpoint = _setSoftwareBreakpoint;
403 debugger->clearSoftwareBreakpoint = _clearSoftwareBreakpoint;
404 gba->debugger = debugger;
405 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = &debugger->d;
406 ARMHotplugAttach(gba->cpu, GBA_COMPONENT_DEBUGGER);
407}
408
409void GBADetachDebugger(struct GBA* gba) {
410 gba->debugger = 0;
411 ARMHotplugDetach(gba->cpu, GBA_COMPONENT_DEBUGGER);
412 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = 0;
413}
414
415bool GBALoadMB(struct GBA* gba, struct VFile* vf, const char* fname) {
416 GBAUnloadROM(gba);
417 gba->romVf = vf;
418 gba->pristineRomSize = vf->size(vf);
419 vf->seek(vf, 0, SEEK_SET);
420 if (gba->pristineRomSize > SIZE_WORKING_RAM) {
421 gba->pristineRomSize = SIZE_WORKING_RAM;
422 }
423#ifdef _3DS
424 gba->pristineRom = 0;
425 if (gba->pristineRomSize <= romBufferSize) {
426 gba->pristineRom = romBuffer;
427 vf->read(vf, romBuffer, gba->pristineRomSize);
428 }
429#else
430 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
431#endif
432 if (!gba->pristineRom) {
433 GBALog(gba, GBA_LOG_WARN, "Couldn't map ROM");
434 return false;
435 }
436 gba->yankedRomSize = 0;
437 gba->activeFile = fname;
438 gba->memory.romSize = 0;
439 gba->memory.romMask = 0;
440 gba->romCrc32 = doCrc32(gba->pristineRom, gba->pristineRomSize);
441 return true;
442}
443
444bool GBALoadROM(struct GBA* gba, struct VFile* vf, struct VFile* sav, const char* fname) {
445 GBAUnloadROM(gba);
446 gba->romVf = vf;
447 gba->pristineRomSize = vf->size(vf);
448 vf->seek(vf, 0, SEEK_SET);
449 if (gba->pristineRomSize > SIZE_CART0) {
450 gba->pristineRomSize = SIZE_CART0;
451 }
452#ifdef _3DS
453 gba->pristineRom = 0;
454 if (gba->pristineRomSize <= romBufferSize) {
455 gba->pristineRom = romBuffer;
456 vf->read(vf, romBuffer, gba->pristineRomSize);
457 }
458#else
459 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
460#endif
461 if (!gba->pristineRom) {
462 GBALog(gba, GBA_LOG_WARN, "Couldn't map ROM");
463 return false;
464 }
465 gba->yankedRomSize = 0;
466 gba->memory.rom = gba->pristineRom;
467 gba->activeFile = fname;
468 gba->memory.romSize = gba->pristineRomSize;
469 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
470 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
471 GBASavedataInit(&gba->memory.savedata, sav);
472 GBAHardwareInit(&gba->memory.hw, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
473 return true;
474 // TODO: error check
475}
476
477void GBAYankROM(struct GBA* gba) {
478 gba->yankedRomSize = gba->memory.romSize;
479 gba->memory.romSize = 0;
480 gba->memory.romMask = 0;
481 GBARaiseIRQ(gba, IRQ_GAMEPAK);
482}
483
484void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
485 gba->biosVf = vf;
486 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
487 if (!bios) {
488 GBALog(gba, GBA_LOG_WARN, "Couldn't map BIOS");
489 return;
490 }
491 gba->memory.bios = bios;
492 gba->memory.fullBios = 1;
493 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
494 GBALog(gba, GBA_LOG_DEBUG, "BIOS Checksum: 0x%X", checksum);
495 if (checksum == GBA_BIOS_CHECKSUM) {
496 GBALog(gba, GBA_LOG_INFO, "Official GBA BIOS detected");
497 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
498 GBALog(gba, GBA_LOG_INFO, "Official GBA (DS) BIOS detected");
499 } else {
500 GBALog(gba, GBA_LOG_WARN, "BIOS checksum incorrect");
501 }
502 gba->biosChecksum = checksum;
503 if (gba->memory.activeRegion == REGION_BIOS) {
504 gba->cpu->memory.activeRegion = gba->memory.bios;
505 }
506 // TODO: error check
507}
508
509void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
510 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
511 if (!patchedSize || patchedSize > SIZE_CART0) {
512 return;
513 }
514 gba->memory.rom = anonymousMemoryMap(SIZE_CART0);
515 if (!patch->applyPatch(patch, gba->pristineRom, gba->pristineRomSize, gba->memory.rom, patchedSize)) {
516 mappedMemoryFree(gba->memory.rom, patchedSize);
517 gba->memory.rom = gba->pristineRom;
518 return;
519 }
520 gba->memory.romSize = patchedSize;
521 gba->memory.romMask = SIZE_CART0 - 1;
522 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
523}
524
525void GBATimerUpdateRegister(struct GBA* gba, int timer) {
526 struct GBATimer* currentTimer = &gba->timers[timer];
527 if (GBATimerFlagsIsEnable(currentTimer->flags) && !GBATimerFlagsIsCountUp(currentTimer->flags)) {
528 int32_t prefetchSkew = 0;
529 if (gba->memory.lastPrefetchedPc - gba->memory.lastPrefetchedLoads * WORD_SIZE_THUMB >= (uint32_t) gba->cpu->gprs[ARM_PC]) {
530 prefetchSkew = (gba->memory.lastPrefetchedPc - gba->cpu->gprs[ARM_PC]) * (gba->cpu->memory.activeSeqCycles16 + 1) / WORD_SIZE_THUMB;
531 }
532 // Reading this takes two cycles (1N+1I), so let's remove them preemptively
533 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent - 2 + prefetchSkew) >> GBATimerFlagsGetPrescaleBits(currentTimer->flags));
534 }
535}
536
537void GBATimerWriteTMCNT_LO(struct GBA* gba, int timer, uint16_t reload) {
538 gba->timers[timer].reload = reload;
539 gba->timers[timer].overflowInterval = (0x10000 - gba->timers[timer].reload) << GBATimerFlagsGetPrescaleBits(gba->timers[timer].flags);
540}
541
542void GBATimerWriteTMCNT_HI(struct GBA* gba, int timer, uint16_t control) {
543 struct GBATimer* currentTimer = &gba->timers[timer];
544 GBATimerUpdateRegister(gba, timer);
545
546 unsigned oldPrescale = GBATimerFlagsGetPrescaleBits(currentTimer->flags);
547 switch (control & 0x0003) {
548 case 0x0000:
549 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 0);
550 break;
551 case 0x0001:
552 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 6);
553 break;
554 case 0x0002:
555 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 8);
556 break;
557 case 0x0003:
558 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 10);
559 break;
560 }
561 currentTimer->flags = GBATimerFlagsTestFillCountUp(currentTimer->flags, control & 0x0004);
562 currentTimer->flags = GBATimerFlagsTestFillDoIrq(currentTimer->flags, control & 0x0040);
563 currentTimer->overflowInterval = (0x10000 - currentTimer->reload) << GBATimerFlagsGetPrescaleBits(currentTimer->flags);
564 bool wasEnabled = GBATimerFlagsIsEnable(currentTimer->flags);
565 currentTimer->flags = GBATimerFlagsTestFillEnable(currentTimer->flags, control & 0x0080);
566 if (!wasEnabled && GBATimerFlagsIsEnable(currentTimer->flags)) {
567 if (!GBATimerFlagsIsCountUp(currentTimer->flags)) {
568 currentTimer->nextEvent = gba->cpu->cycles + currentTimer->overflowInterval;
569 } else {
570 currentTimer->nextEvent = INT_MAX;
571 }
572 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->reload;
573 currentTimer->oldReload = currentTimer->reload;
574 currentTimer->lastEvent = gba->cpu->cycles;
575 gba->timersEnabled |= 1 << timer;
576 } else if (wasEnabled && !GBATimerFlagsIsEnable(currentTimer->flags)) {
577 if (!GBATimerFlagsIsCountUp(currentTimer->flags)) {
578 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> oldPrescale);
579 }
580 gba->timersEnabled &= ~(1 << timer);
581 } else if (GBATimerFlagsGetPrescaleBits(currentTimer->flags) != oldPrescale && !GBATimerFlagsIsCountUp(currentTimer->flags)) {
582 // FIXME: this might be before present
583 currentTimer->nextEvent = currentTimer->lastEvent + currentTimer->overflowInterval;
584 }
585
586 if (currentTimer->nextEvent < gba->cpu->nextEvent) {
587 gba->cpu->nextEvent = currentTimer->nextEvent;
588 }
589};
590
591void GBAWriteIE(struct GBA* gba, uint16_t value) {
592 if (value & (1 << IRQ_KEYPAD)) {
593 GBALog(gba, GBA_LOG_STUB, "Keypad interrupts not implemented");
594 }
595
596 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
597 ARMRaiseIRQ(gba->cpu);
598 }
599}
600
601void GBAWriteIME(struct GBA* gba, uint16_t value) {
602 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
603 ARMRaiseIRQ(gba->cpu);
604 }
605}
606
607void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
608 gba->memory.io[REG_IF >> 1] |= 1 << irq;
609 gba->cpu->halted = 0;
610
611 if (gba->memory.io[REG_IME >> 1] && (gba->memory.io[REG_IE >> 1] & 1 << irq)) {
612 ARMRaiseIRQ(gba->cpu);
613 }
614}
615
616void GBATestIRQ(struct ARMCore* cpu) {
617 struct GBA* gba = (struct GBA*) cpu->master;
618 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
619 gba->springIRQ = 1;
620 gba->cpu->nextEvent = gba->cpu->cycles;
621 }
622}
623
624void GBAHalt(struct GBA* gba) {
625 gba->cpu->nextEvent = gba->cpu->cycles;
626 gba->cpu->halted = 1;
627}
628
629void GBAStop(struct GBA* gba) {
630 if (!gba->stopCallback) {
631 return;
632 }
633 gba->cpu->nextEvent = gba->cpu->cycles;
634 gba->stopCallback->stop(gba->stopCallback);
635}
636
637static void _GBAVLog(struct GBA* gba, enum GBALogLevel level, const char* format, va_list args) {
638 struct GBAThread* threadContext = GBAThreadGetContext();
639 enum GBALogLevel logLevel = GBA_LOG_ALL;
640
641 if (gba) {
642 logLevel = gba->logLevel;
643 }
644
645 if (threadContext) {
646 logLevel = threadContext->logLevel;
647 gba = threadContext->gba;
648 }
649
650 if (!(level & logLevel) && level != GBA_LOG_FATAL) {
651 return;
652 }
653
654 if (level == GBA_LOG_FATAL && gba) {
655 gba->cpu->nextEvent = 0;
656 }
657
658 if (threadContext) {
659 if (level == GBA_LOG_FATAL) {
660 MutexLock(&threadContext->stateMutex);
661 threadContext->state = THREAD_CRASHED;
662 MutexUnlock(&threadContext->stateMutex);
663 }
664 }
665 if (gba && gba->logHandler) {
666 gba->logHandler(threadContext, level, format, args);
667 return;
668 }
669
670 vprintf(format, args);
671 printf("\n");
672
673 if (level == GBA_LOG_FATAL && !threadContext) {
674 abort();
675 }
676}
677
678void GBALog(struct GBA* gba, enum GBALogLevel level, const char* format, ...) {
679 va_list args;
680 va_start(args, format);
681 _GBAVLog(gba, level, format, args);
682 va_end(args);
683}
684
685void GBADebuggerLogShim(struct ARMDebugger* debugger, enum DebuggerLogLevel level, const char* format, ...) {
686 struct GBA* gba = 0;
687 if (debugger->cpu) {
688 gba = (struct GBA*) debugger->cpu->master;
689 }
690
691 enum GBALogLevel gbaLevel;
692 switch (level) {
693 default: // Avoids compiler warning
694 case DEBUGGER_LOG_DEBUG:
695 gbaLevel = GBA_LOG_DEBUG;
696 break;
697 case DEBUGGER_LOG_INFO:
698 gbaLevel = GBA_LOG_INFO;
699 break;
700 case DEBUGGER_LOG_WARN:
701 gbaLevel = GBA_LOG_WARN;
702 break;
703 case DEBUGGER_LOG_ERROR:
704 gbaLevel = GBA_LOG_ERROR;
705 break;
706 }
707 va_list args;
708 va_start(args, format);
709 _GBAVLog(gba, gbaLevel, format, args);
710 va_end(args);
711}
712
713bool GBAIsROM(struct VFile* vf) {
714 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
715 return false;
716 }
717 uint8_t signature[sizeof(GBA_ROM_MAGIC)];
718 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
719 return false;
720 }
721 if (GBAIsBIOS(vf)) {
722 return false;
723 }
724 return memcmp(signature, GBA_ROM_MAGIC, sizeof(signature)) == 0;
725}
726
727bool GBAIsMB(struct VFile* vf) {
728 if (!GBAIsROM(vf)) {
729 return false;
730 }
731 if (vf->size(vf) > SIZE_WORKING_RAM) {
732 return false;
733 }
734 if (vf->seek(vf, GBA_MB_MAGIC_OFFSET, SEEK_SET) < 0) {
735 return false;
736 }
737 uint32_t signature;
738 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
739 return false;
740 }
741 uint32_t opcode;
742 LOAD_32(opcode, 0, &signature);
743 struct ARMInstructionInfo info;
744 ARMDecodeARM(opcode, &info);
745 if (info.branchType != ARM_BRANCH) {
746 return false;
747 }
748 if (info.op1.immediate <= 0) {
749 return false;
750 } else if (info.op1.immediate == 28) {
751 // Ancient toolchain that is known to throw MB detection for a loop
752 return false;
753 } else if (info.op1.immediate != 24) {
754 return true;
755 }
756 // Found a libgba-linked cart...these are a bit harder to detect.
757 return false;
758}
759
760bool GBAIsBIOS(struct VFile* vf) {
761 if (vf->seek(vf, 0, SEEK_SET) < 0) {
762 return false;
763 }
764 uint8_t interruptTable[7 * 4];
765 if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
766 return false;
767 }
768 int i;
769 for (i = 0; i < 7; ++i) {
770 if (interruptTable[4 * i + 3] != 0xEA || interruptTable[4 * i + 2]) {
771 return false;
772 }
773 }
774 return true;
775}
776
777void GBAGetGameCode(struct GBA* gba, char* out) {
778 if (!gba->memory.rom) {
779 out[0] = '\0';
780 return;
781 }
782 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->id, 4);
783}
784
785void GBAGetGameTitle(struct GBA* gba, char* out) {
786 if (gba->memory.rom) {
787 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
788 return;
789 }
790 if (gba->pristineRom) {
791 memcpy(out, &((struct GBACartridge*) gba->pristineRom)->title, 12);
792 return;
793 }
794 strncpy(out, "(BIOS)", 12);
795}
796
797void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
798 struct GBA* gba = (struct GBA*) cpu->master;
799 enum GBALogLevel level = GBA_LOG_ERROR;
800 if (gba->debugger) {
801 level = GBA_LOG_STUB;
802 struct DebuggerEntryInfo info = {
803 .address = _ARMPCAddress(cpu),
804 .opcode = opcode
805 };
806 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP, &info);
807 }
808 GBALog(gba, level, "Stub opcode: %08x", opcode);
809}
810
811void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
812 struct GBA* gba = (struct GBA*) cpu->master;
813 if (!gba->yankedRomSize) {
814 GBALog(gba, GBA_LOG_WARN, "Illegal opcode: %08x", opcode);
815 }
816 if (gba->debugger) {
817 struct DebuggerEntryInfo info = {
818 .address = _ARMPCAddress(cpu),
819 .opcode = opcode
820 };
821 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP, &info);
822 } else {
823 ARMRaiseUndefined(cpu);
824 }
825}
826
827void GBABreakpoint(struct ARMCore* cpu, int immediate) {
828 struct GBA* gba = (struct GBA*) cpu->master;
829 if (immediate >= GBA_COMPONENT_MAX) {
830 return;
831 }
832 switch (immediate) {
833 case GBA_COMPONENT_DEBUGGER:
834 if (gba->debugger) {
835 struct DebuggerEntryInfo info = {
836 .address = _ARMPCAddress(cpu)
837 };
838 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_BREAKPOINT, &info);
839 }
840 break;
841 case GBA_COMPONENT_CHEAT_DEVICE:
842 if (gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE]) {
843 struct GBACheatDevice* device = (struct GBACheatDevice*) gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE];
844 struct GBACheatHook* hook = 0;
845 size_t i;
846 for (i = 0; i < GBACheatSetsSize(&device->cheats); ++i) {
847 struct GBACheatSet* cheats = *GBACheatSetsGetPointer(&device->cheats, i);
848 if (cheats->hook && cheats->hook->address == _ARMPCAddress(cpu)) {
849 GBACheatRefresh(device, cheats);
850 hook = cheats->hook;
851 }
852 }
853 if (hook) {
854 ARMRunFake(cpu, hook->patchedOpcode);
855 }
856 }
857 break;
858 default:
859 break;
860 }
861}
862
863void GBAFrameStarted(struct GBA* gba) {
864 UNUSED(gba);
865
866 struct GBAThread* thread = GBAThreadGetContext();
867 if (!thread) {
868 return;
869 }
870
871 if (thread->rewindBuffer) {
872 --thread->rewindBufferNext;
873 if (thread->rewindBufferNext <= 0) {
874 thread->rewindBufferNext = thread->rewindBufferInterval;
875 GBARecordFrame(thread);
876 }
877 }
878}
879
880void GBAFrameEnded(struct GBA* gba) {
881 GBASavedataClean(&gba->memory.savedata, gba->video.frameCounter);
882
883 if (gba->rr) {
884 gba->rr->nextFrame(gba->rr);
885 }
886
887 if (gba->cpu->components && gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE]) {
888 struct GBACheatDevice* device = (struct GBACheatDevice*) gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE];
889 size_t i;
890 for (i = 0; i < GBACheatSetsSize(&device->cheats); ++i) {
891 struct GBACheatSet* cheats = *GBACheatSetsGetPointer(&device->cheats, i);
892 if (!cheats->hook) {
893 GBACheatRefresh(device, cheats);
894 }
895 }
896 }
897
898 if (gba->stream && gba->stream->postVideoFrame) {
899 gba->stream->postVideoFrame(gba->stream, gba->video.renderer);
900 }
901
902 if (gba->memory.hw.devices & (HW_GB_PLAYER | HW_GB_PLAYER_DETECTION)) {
903 GBAHardwarePlayerUpdate(gba);
904 }
905
906 struct GBAThread* thread = GBAThreadGetContext();
907 if (!thread) {
908 return;
909 }
910
911 if (thread->frameCallback) {
912 thread->frameCallback(thread);
913 }
914}
915
916void GBASetBreakpoint(struct GBA* gba, struct ARMComponent* component, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
917 size_t immediate;
918 for (immediate = 0; immediate < gba->cpu->numComponents; ++immediate) {
919 if (gba->cpu->components[immediate] == component) {
920 break;
921 }
922 }
923 if (immediate == gba->cpu->numComponents) {
924 return;
925 }
926 if (mode == MODE_ARM) {
927 int32_t value;
928 int32_t old;
929 value = 0xE1200070;
930 value |= immediate & 0xF;
931 value |= (immediate & 0xFFF0) << 4;
932 GBAPatch32(gba->cpu, address, value, &old);
933 *opcode = old;
934 } else {
935 int16_t value;
936 int16_t old;
937 value = 0xBE00;
938 value |= immediate & 0xFF;
939 GBAPatch16(gba->cpu, address, value, &old);
940 *opcode = (uint16_t) old;
941 }
942}
943
944void GBAClearBreakpoint(struct GBA* gba, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
945 if (mode == MODE_ARM) {
946 GBAPatch32(gba->cpu, address, opcode, 0);
947 } else {
948 GBAPatch16(gba->cpu, address, opcode, 0);
949 }
950}
951
952#if (!defined(USE_PTHREADS) && !defined(_WIN32)) || defined(DISABLE_THREADING)
953struct GBAThread* GBAThreadGetContext(void) {
954 return 0;
955}
956#endif
957
958static bool _setSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
959 GBASetBreakpoint((struct GBA*) debugger->cpu->master, &debugger->d, address, mode, opcode);
960 return true;
961}
962
963static bool _clearSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
964 GBAClearBreakpoint((struct GBA*) debugger->cpu->master, address, mode, opcode);
965 return true;
966}