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 gba->allowOpposingDirections = true;
105
106 gba->performingDMA = false;
107
108 gba->pristineRom = 0;
109 gba->pristineRomSize = 0;
110 gba->yankedRomSize = 0;
111}
112
113void GBAUnloadROM(struct GBA* gba) {
114 if (gba->memory.rom && gba->pristineRom != gba->memory.rom) {
115 if (gba->yankedRomSize) {
116 gba->yankedRomSize = 0;
117 }
118 mappedMemoryFree(gba->memory.rom, SIZE_CART0);
119 }
120 gba->memory.rom = 0;
121
122 if (gba->romVf) {
123#ifndef _3DS
124 gba->romVf->unmap(gba->romVf, gba->pristineRom, gba->pristineRomSize);
125#endif
126 gba->pristineRom = 0;
127 gba->romVf = 0;
128 }
129
130 GBASavedataDeinit(&gba->memory.savedata);
131 gba->idleLoop = IDLE_LOOP_NONE;
132}
133
134void GBADestroy(struct GBA* gba) {
135 GBAUnloadROM(gba);
136
137 if (gba->biosVf) {
138 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
139 }
140
141 GBAMemoryDeinit(gba);
142 GBAVideoDeinit(&gba->video);
143 GBAAudioDeinit(&gba->audio);
144 GBASIODeinit(&gba->sio);
145 gba->rr = 0;
146}
147
148void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
149 irqh->reset = GBAReset;
150 irqh->processEvents = GBAProcessEvents;
151 irqh->swi16 = GBASwi16;
152 irqh->swi32 = GBASwi32;
153 irqh->hitIllegal = GBAIllegal;
154 irqh->readCPSR = GBATestIRQ;
155 irqh->hitStub = GBAHitStub;
156 irqh->bkpt16 = GBABreakpoint;
157 irqh->bkpt32 = GBABreakpoint;
158}
159
160void GBAReset(struct ARMCore* cpu) {
161 ARMSetPrivilegeMode(cpu, MODE_IRQ);
162 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
163 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
164 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
165 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
166 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
167
168 struct GBA* gba = (struct GBA*) cpu->master;
169 if (!gba->rr || (!gba->rr->isPlaying(gba->rr) && !gba->rr->isRecording(gba->rr))) {
170 GBASavedataUnmask(&gba->memory.savedata);
171 }
172
173 if (gba->yankedRomSize) {
174 gba->memory.romSize = gba->yankedRomSize;
175 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
176 gba->yankedRomSize = 0;
177 }
178 GBAMemoryReset(gba);
179 GBAVideoReset(&gba->video);
180 GBAAudioReset(&gba->audio);
181 GBAIOInit(gba);
182
183 GBASIOReset(&gba->sio);
184
185 gba->timersEnabled = 0;
186 memset(gba->timers, 0, sizeof(gba->timers));
187
188 gba->lastJump = 0;
189 gba->haltPending = false;
190 gba->idleDetectionStep = 0;
191 gba->idleDetectionFailures = 0;
192}
193
194void GBASkipBIOS(struct GBA* gba) {
195 struct ARMCore* cpu = gba->cpu;
196 if (cpu->gprs[ARM_PC] == BASE_RESET + WORD_SIZE_ARM) {
197 if (gba->memory.rom) {
198 cpu->gprs[ARM_PC] = BASE_CART0;
199 } else {
200 cpu->gprs[ARM_PC] = BASE_WORKING_RAM;
201 }
202 int currentCycles = 0;
203 ARM_WRITE_PC;
204 }
205}
206
207static void GBAProcessEvents(struct ARMCore* cpu) {
208 do {
209 struct GBA* gba = (struct GBA*) cpu->master;
210 int32_t cycles = cpu->nextEvent;
211 int32_t nextEvent = INT_MAX;
212 int32_t testEvent;
213#ifndef NDEBUG
214 if (cycles < 0) {
215 GBALog(gba, GBA_LOG_FATAL, "Negative cycles passed: %i", cycles);
216 }
217#endif
218
219 gba->bus = cpu->prefetch[1];
220 if (cpu->executionMode == MODE_THUMB) {
221 gba->bus |= cpu->prefetch[1] << 16;
222 }
223
224 if (gba->springIRQ) {
225 ARMRaiseIRQ(cpu);
226 gba->springIRQ = 0;
227 }
228
229 testEvent = GBAVideoProcessEvents(&gba->video, cycles);
230 if (testEvent < nextEvent) {
231 nextEvent = testEvent;
232 }
233
234 testEvent = GBAAudioProcessEvents(&gba->audio, cycles);
235 if (testEvent < nextEvent) {
236 nextEvent = testEvent;
237 }
238
239 testEvent = GBATimersProcessEvents(gba, cycles);
240 if (testEvent < nextEvent) {
241 nextEvent = testEvent;
242 }
243
244 testEvent = GBAMemoryRunDMAs(gba, cycles);
245 if (testEvent < nextEvent) {
246 nextEvent = testEvent;
247 }
248
249 testEvent = GBASIOProcessEvents(&gba->sio, cycles);
250 if (testEvent < nextEvent) {
251 nextEvent = testEvent;
252 }
253
254 cpu->cycles -= cycles;
255 cpu->nextEvent = nextEvent;
256
257 if (cpu->halted) {
258 cpu->cycles = cpu->nextEvent;
259 }
260 } while (cpu->cycles >= cpu->nextEvent);
261}
262
263static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
264 int32_t nextEvent = INT_MAX;
265 if (gba->timersEnabled) {
266 struct GBATimer* timer;
267 struct GBATimer* nextTimer;
268
269 timer = &gba->timers[0];
270 if (GBATimerFlagsIsEnable(timer->flags)) {
271 timer->nextEvent -= cycles;
272 timer->lastEvent -= cycles;
273 while (timer->nextEvent <= 0) {
274 timer->lastEvent = timer->nextEvent;
275 timer->nextEvent += timer->overflowInterval;
276 gba->memory.io[REG_TM0CNT_LO >> 1] = timer->reload;
277 timer->oldReload = timer->reload;
278
279 if (GBATimerFlagsIsDoIrq(timer->flags)) {
280 GBARaiseIRQ(gba, IRQ_TIMER0);
281 }
282
283 if (gba->audio.enable) {
284 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
285 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
286 }
287
288 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
289 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
290 }
291 }
292
293 nextTimer = &gba->timers[1];
294 if (GBATimerFlagsIsCountUp(nextTimer->flags)) {
295 ++gba->memory.io[REG_TM1CNT_LO >> 1];
296 if (!gba->memory.io[REG_TM1CNT_LO >> 1]) {
297 nextTimer->nextEvent = 0;
298 }
299 }
300 }
301 nextEvent = timer->nextEvent;
302 }
303
304 timer = &gba->timers[1];
305 if (GBATimerFlagsIsEnable(timer->flags)) {
306 timer->nextEvent -= cycles;
307 timer->lastEvent -= cycles;
308 if (timer->nextEvent <= 0) {
309 timer->lastEvent = timer->nextEvent;
310 timer->nextEvent += timer->overflowInterval;
311 gba->memory.io[REG_TM1CNT_LO >> 1] = timer->reload;
312 timer->oldReload = timer->reload;
313
314 if (GBATimerFlagsIsDoIrq(timer->flags)) {
315 GBARaiseIRQ(gba, IRQ_TIMER1);
316 }
317
318 if (gba->audio.enable) {
319 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
320 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
321 }
322
323 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
324 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
325 }
326 }
327
328 if (GBATimerFlagsIsCountUp(timer->flags)) {
329 timer->nextEvent = INT_MAX;
330 }
331
332 nextTimer = &gba->timers[2];
333 if (GBATimerFlagsIsCountUp(nextTimer->flags)) {
334 ++gba->memory.io[REG_TM2CNT_LO >> 1];
335 if (!gba->memory.io[REG_TM2CNT_LO >> 1]) {
336 nextTimer->nextEvent = 0;
337 }
338 }
339 }
340 if (timer->nextEvent < nextEvent) {
341 nextEvent = timer->nextEvent;
342 }
343 }
344
345 timer = &gba->timers[2];
346 if (GBATimerFlagsIsEnable(timer->flags)) {
347 timer->nextEvent -= cycles;
348 timer->lastEvent -= cycles;
349 if (timer->nextEvent <= 0) {
350 timer->lastEvent = timer->nextEvent;
351 timer->nextEvent += timer->overflowInterval;
352 gba->memory.io[REG_TM2CNT_LO >> 1] = timer->reload;
353 timer->oldReload = timer->reload;
354
355 if (GBATimerFlagsIsDoIrq(timer->flags)) {
356 GBARaiseIRQ(gba, IRQ_TIMER2);
357 }
358
359 if (GBATimerFlagsIsCountUp(timer->flags)) {
360 timer->nextEvent = INT_MAX;
361 }
362
363 nextTimer = &gba->timers[3];
364 if (GBATimerFlagsIsCountUp(nextTimer->flags)) {
365 ++gba->memory.io[REG_TM3CNT_LO >> 1];
366 if (!gba->memory.io[REG_TM3CNT_LO >> 1]) {
367 nextTimer->nextEvent = 0;
368 }
369 }
370 }
371 if (timer->nextEvent < nextEvent) {
372 nextEvent = timer->nextEvent;
373 }
374 }
375
376 timer = &gba->timers[3];
377 if (GBATimerFlagsIsEnable(timer->flags)) {
378 timer->nextEvent -= cycles;
379 timer->lastEvent -= cycles;
380 if (timer->nextEvent <= 0) {
381 timer->lastEvent = timer->nextEvent;
382 timer->nextEvent += timer->overflowInterval;
383 gba->memory.io[REG_TM3CNT_LO >> 1] = timer->reload;
384 timer->oldReload = timer->reload;
385
386 if (GBATimerFlagsIsDoIrq(timer->flags)) {
387 GBARaiseIRQ(gba, IRQ_TIMER3);
388 }
389
390 if (GBATimerFlagsIsCountUp(timer->flags)) {
391 timer->nextEvent = INT_MAX;
392 }
393 }
394 if (timer->nextEvent < nextEvent) {
395 nextEvent = timer->nextEvent;
396 }
397 }
398 }
399 return nextEvent;
400}
401
402void GBAAttachDebugger(struct GBA* gba, struct ARMDebugger* debugger) {
403 debugger->setSoftwareBreakpoint = _setSoftwareBreakpoint;
404 debugger->clearSoftwareBreakpoint = _clearSoftwareBreakpoint;
405 gba->debugger = debugger;
406 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = &debugger->d;
407 ARMHotplugAttach(gba->cpu, GBA_COMPONENT_DEBUGGER);
408}
409
410void GBADetachDebugger(struct GBA* gba) {
411 gba->debugger = 0;
412 ARMHotplugDetach(gba->cpu, GBA_COMPONENT_DEBUGGER);
413 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = 0;
414}
415
416bool GBALoadMB(struct GBA* gba, struct VFile* vf, const char* fname) {
417 GBAUnloadROM(gba);
418 gba->romVf = vf;
419 gba->pristineRomSize = vf->size(vf);
420 vf->seek(vf, 0, SEEK_SET);
421 if (gba->pristineRomSize > SIZE_WORKING_RAM) {
422 gba->pristineRomSize = SIZE_WORKING_RAM;
423 }
424#ifdef _3DS
425 gba->pristineRom = 0;
426 if (gba->pristineRomSize <= romBufferSize) {
427 gba->pristineRom = romBuffer;
428 vf->read(vf, romBuffer, gba->pristineRomSize);
429 }
430#else
431 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
432#endif
433 if (!gba->pristineRom) {
434 GBALog(gba, GBA_LOG_WARN, "Couldn't map ROM");
435 return false;
436 }
437 gba->yankedRomSize = 0;
438 gba->activeFile = fname;
439 gba->memory.romSize = 0;
440 gba->memory.romMask = 0;
441 gba->romCrc32 = doCrc32(gba->pristineRom, gba->pristineRomSize);
442 return true;
443}
444
445bool GBALoadROM(struct GBA* gba, struct VFile* vf, struct VFile* sav, const char* fname) {
446 GBAUnloadROM(gba);
447 gba->romVf = vf;
448 gba->pristineRomSize = vf->size(vf);
449 vf->seek(vf, 0, SEEK_SET);
450 if (gba->pristineRomSize > SIZE_CART0) {
451 gba->pristineRomSize = SIZE_CART0;
452 }
453#ifdef _3DS
454 gba->pristineRom = 0;
455 if (gba->pristineRomSize <= romBufferSize) {
456 gba->pristineRom = romBuffer;
457 vf->read(vf, romBuffer, gba->pristineRomSize);
458 }
459#else
460 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
461#endif
462 if (!gba->pristineRom) {
463 GBALog(gba, GBA_LOG_WARN, "Couldn't map ROM");
464 return false;
465 }
466 gba->yankedRomSize = 0;
467 gba->memory.rom = gba->pristineRom;
468 gba->activeFile = fname;
469 gba->memory.romSize = gba->pristineRomSize;
470 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
471 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
472 GBASavedataInit(&gba->memory.savedata, sav);
473 GBAHardwareInit(&gba->memory.hw, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
474 return true;
475 // TODO: error check
476}
477
478void GBAYankROM(struct GBA* gba) {
479 gba->yankedRomSize = gba->memory.romSize;
480 gba->memory.romSize = 0;
481 gba->memory.romMask = 0;
482 GBARaiseIRQ(gba, IRQ_GAMEPAK);
483}
484
485void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
486 gba->biosVf = vf;
487 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
488 if (!bios) {
489 GBALog(gba, GBA_LOG_WARN, "Couldn't map BIOS");
490 return;
491 }
492 gba->memory.bios = bios;
493 gba->memory.fullBios = 1;
494 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
495 GBALog(gba, GBA_LOG_DEBUG, "BIOS Checksum: 0x%X", checksum);
496 if (checksum == GBA_BIOS_CHECKSUM) {
497 GBALog(gba, GBA_LOG_INFO, "Official GBA BIOS detected");
498 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
499 GBALog(gba, GBA_LOG_INFO, "Official GBA (DS) BIOS detected");
500 } else {
501 GBALog(gba, GBA_LOG_WARN, "BIOS checksum incorrect");
502 }
503 gba->biosChecksum = checksum;
504 if (gba->memory.activeRegion == REGION_BIOS) {
505 gba->cpu->memory.activeRegion = gba->memory.bios;
506 }
507 // TODO: error check
508}
509
510void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
511 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
512 if (!patchedSize || patchedSize > SIZE_CART0) {
513 return;
514 }
515 gba->memory.rom = anonymousMemoryMap(SIZE_CART0);
516 if (!patch->applyPatch(patch, gba->pristineRom, gba->pristineRomSize, gba->memory.rom, patchedSize)) {
517 mappedMemoryFree(gba->memory.rom, patchedSize);
518 gba->memory.rom = gba->pristineRom;
519 return;
520 }
521 gba->memory.romSize = patchedSize;
522 gba->memory.romMask = SIZE_CART0 - 1;
523 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
524}
525
526void GBATimerUpdateRegister(struct GBA* gba, int timer) {
527 struct GBATimer* currentTimer = &gba->timers[timer];
528 if (GBATimerFlagsIsEnable(currentTimer->flags) && !GBATimerFlagsIsCountUp(currentTimer->flags)) {
529 int32_t prefetchSkew = 0;
530 if (gba->memory.lastPrefetchedPc - gba->memory.lastPrefetchedLoads * WORD_SIZE_THUMB >= (uint32_t) gba->cpu->gprs[ARM_PC]) {
531 prefetchSkew = (gba->memory.lastPrefetchedPc - gba->cpu->gprs[ARM_PC]) * (gba->cpu->memory.activeSeqCycles16 + 1) / WORD_SIZE_THUMB;
532 }
533 // Reading this takes two cycles (1N+1I), so let's remove them preemptively
534 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent - 2 + prefetchSkew) >> GBATimerFlagsGetPrescaleBits(currentTimer->flags));
535 }
536}
537
538void GBATimerWriteTMCNT_LO(struct GBA* gba, int timer, uint16_t reload) {
539 gba->timers[timer].reload = reload;
540 gba->timers[timer].overflowInterval = (0x10000 - gba->timers[timer].reload) << GBATimerFlagsGetPrescaleBits(gba->timers[timer].flags);
541}
542
543void GBATimerWriteTMCNT_HI(struct GBA* gba, int timer, uint16_t control) {
544 struct GBATimer* currentTimer = &gba->timers[timer];
545 GBATimerUpdateRegister(gba, timer);
546
547 unsigned oldPrescale = GBATimerFlagsGetPrescaleBits(currentTimer->flags);
548 switch (control & 0x0003) {
549 case 0x0000:
550 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 0);
551 break;
552 case 0x0001:
553 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 6);
554 break;
555 case 0x0002:
556 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 8);
557 break;
558 case 0x0003:
559 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 10);
560 break;
561 }
562 currentTimer->flags = GBATimerFlagsTestFillCountUp(currentTimer->flags, control & 0x0004);
563 currentTimer->flags = GBATimerFlagsTestFillDoIrq(currentTimer->flags, control & 0x0040);
564 currentTimer->overflowInterval = (0x10000 - currentTimer->reload) << GBATimerFlagsGetPrescaleBits(currentTimer->flags);
565 bool wasEnabled = GBATimerFlagsIsEnable(currentTimer->flags);
566 currentTimer->flags = GBATimerFlagsTestFillEnable(currentTimer->flags, control & 0x0080);
567 if (!wasEnabled && GBATimerFlagsIsEnable(currentTimer->flags)) {
568 if (!GBATimerFlagsIsCountUp(currentTimer->flags)) {
569 currentTimer->nextEvent = gba->cpu->cycles + currentTimer->overflowInterval;
570 } else {
571 currentTimer->nextEvent = INT_MAX;
572 }
573 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->reload;
574 currentTimer->oldReload = currentTimer->reload;
575 currentTimer->lastEvent = gba->cpu->cycles;
576 gba->timersEnabled |= 1 << timer;
577 } else if (wasEnabled && !GBATimerFlagsIsEnable(currentTimer->flags)) {
578 if (!GBATimerFlagsIsCountUp(currentTimer->flags)) {
579 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> oldPrescale);
580 }
581 gba->timersEnabled &= ~(1 << timer);
582 } else if (GBATimerFlagsGetPrescaleBits(currentTimer->flags) != oldPrescale && !GBATimerFlagsIsCountUp(currentTimer->flags)) {
583 // FIXME: this might be before present
584 currentTimer->nextEvent = currentTimer->lastEvent + currentTimer->overflowInterval;
585 }
586
587 if (currentTimer->nextEvent < gba->cpu->nextEvent) {
588 gba->cpu->nextEvent = currentTimer->nextEvent;
589 }
590};
591
592void GBAWriteIE(struct GBA* gba, uint16_t value) {
593 if (value & (1 << IRQ_KEYPAD)) {
594 GBALog(gba, GBA_LOG_STUB, "Keypad interrupts not implemented");
595 }
596
597 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
598 ARMRaiseIRQ(gba->cpu);
599 }
600}
601
602void GBAWriteIME(struct GBA* gba, uint16_t value) {
603 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
604 ARMRaiseIRQ(gba->cpu);
605 }
606}
607
608void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
609 gba->memory.io[REG_IF >> 1] |= 1 << irq;
610 gba->cpu->halted = 0;
611
612 if (gba->memory.io[REG_IME >> 1] && (gba->memory.io[REG_IE >> 1] & 1 << irq)) {
613 ARMRaiseIRQ(gba->cpu);
614 }
615}
616
617void GBATestIRQ(struct ARMCore* cpu) {
618 struct GBA* gba = (struct GBA*) cpu->master;
619 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
620 gba->springIRQ = 1;
621 gba->cpu->nextEvent = gba->cpu->cycles;
622 }
623}
624
625void GBAHalt(struct GBA* gba) {
626 gba->cpu->nextEvent = gba->cpu->cycles;
627 gba->cpu->halted = 1;
628}
629
630void GBAStop(struct GBA* gba) {
631 if (!gba->stopCallback) {
632 return;
633 }
634 gba->cpu->nextEvent = gba->cpu->cycles;
635 gba->stopCallback->stop(gba->stopCallback);
636}
637
638static void _GBAVLog(struct GBA* gba, enum GBALogLevel level, const char* format, va_list args) {
639 struct GBAThread* threadContext = GBAThreadGetContext();
640 enum GBALogLevel logLevel = GBA_LOG_ALL;
641
642 if (gba) {
643 logLevel = gba->logLevel;
644 }
645
646 if (threadContext) {
647 logLevel = threadContext->logLevel;
648 gba = threadContext->gba;
649 }
650
651 if (!(level & logLevel) && level != GBA_LOG_FATAL) {
652 return;
653 }
654
655 if (level == GBA_LOG_FATAL && gba) {
656 gba->cpu->nextEvent = 0;
657 }
658
659 if (threadContext) {
660 if (level == GBA_LOG_FATAL) {
661 MutexLock(&threadContext->stateMutex);
662 threadContext->state = THREAD_CRASHED;
663 MutexUnlock(&threadContext->stateMutex);
664 }
665 }
666 if (gba && gba->logHandler) {
667 gba->logHandler(threadContext, level, format, args);
668 return;
669 }
670
671 vprintf(format, args);
672 printf("\n");
673
674 if (level == GBA_LOG_FATAL && !threadContext) {
675 abort();
676 }
677}
678
679void GBALog(struct GBA* gba, enum GBALogLevel level, const char* format, ...) {
680 va_list args;
681 va_start(args, format);
682 _GBAVLog(gba, level, format, args);
683 va_end(args);
684}
685
686void GBADebuggerLogShim(struct ARMDebugger* debugger, enum DebuggerLogLevel level, const char* format, ...) {
687 struct GBA* gba = 0;
688 if (debugger->cpu) {
689 gba = (struct GBA*) debugger->cpu->master;
690 }
691
692 enum GBALogLevel gbaLevel;
693 switch (level) {
694 default: // Avoids compiler warning
695 case DEBUGGER_LOG_DEBUG:
696 gbaLevel = GBA_LOG_DEBUG;
697 break;
698 case DEBUGGER_LOG_INFO:
699 gbaLevel = GBA_LOG_INFO;
700 break;
701 case DEBUGGER_LOG_WARN:
702 gbaLevel = GBA_LOG_WARN;
703 break;
704 case DEBUGGER_LOG_ERROR:
705 gbaLevel = GBA_LOG_ERROR;
706 break;
707 }
708 va_list args;
709 va_start(args, format);
710 _GBAVLog(gba, gbaLevel, format, args);
711 va_end(args);
712}
713
714bool GBAIsROM(struct VFile* vf) {
715 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
716 return false;
717 }
718 uint8_t signature[sizeof(GBA_ROM_MAGIC)];
719 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
720 return false;
721 }
722 if (GBAIsBIOS(vf)) {
723 return false;
724 }
725 return memcmp(signature, GBA_ROM_MAGIC, sizeof(signature)) == 0;
726}
727
728bool GBAIsMB(struct VFile* vf) {
729 if (!GBAIsROM(vf)) {
730 return false;
731 }
732 if (vf->size(vf) > SIZE_WORKING_RAM) {
733 return false;
734 }
735 if (vf->seek(vf, GBA_MB_MAGIC_OFFSET, SEEK_SET) < 0) {
736 return false;
737 }
738 uint32_t signature;
739 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
740 return false;
741 }
742 uint32_t opcode;
743 LOAD_32(opcode, 0, &signature);
744 struct ARMInstructionInfo info;
745 ARMDecodeARM(opcode, &info);
746 if (info.branchType != ARM_BRANCH) {
747 return false;
748 }
749 if (info.op1.immediate <= 0) {
750 return false;
751 } else if (info.op1.immediate == 28) {
752 // Ancient toolchain that is known to throw MB detection for a loop
753 return false;
754 } else if (info.op1.immediate != 24) {
755 return true;
756 }
757 // Found a libgba-linked cart...these are a bit harder to detect.
758 return false;
759}
760
761bool GBAIsBIOS(struct VFile* vf) {
762 if (vf->seek(vf, 0, SEEK_SET) < 0) {
763 return false;
764 }
765 uint8_t interruptTable[7 * 4];
766 if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
767 return false;
768 }
769 int i;
770 for (i = 0; i < 7; ++i) {
771 if (interruptTable[4 * i + 3] != 0xEA || interruptTable[4 * i + 2]) {
772 return false;
773 }
774 }
775 return true;
776}
777
778void GBAGetGameCode(struct GBA* gba, char* out) {
779 if (!gba->memory.rom) {
780 out[0] = '\0';
781 return;
782 }
783 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->id, 4);
784}
785
786void GBAGetGameTitle(struct GBA* gba, char* out) {
787 if (gba->memory.rom) {
788 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
789 return;
790 }
791 if (gba->pristineRom) {
792 memcpy(out, &((struct GBACartridge*) gba->pristineRom)->title, 12);
793 return;
794 }
795 strncpy(out, "(BIOS)", 12);
796}
797
798void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
799 struct GBA* gba = (struct GBA*) cpu->master;
800 enum GBALogLevel level = GBA_LOG_ERROR;
801 if (gba->debugger) {
802 level = GBA_LOG_STUB;
803 struct DebuggerEntryInfo info = {
804 .address = _ARMPCAddress(cpu),
805 .opcode = opcode
806 };
807 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP, &info);
808 }
809 GBALog(gba, level, "Stub opcode: %08x", opcode);
810}
811
812void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
813 struct GBA* gba = (struct GBA*) cpu->master;
814 if (!gba->yankedRomSize) {
815 GBALog(gba, GBA_LOG_WARN, "Illegal opcode: %08x", opcode);
816 }
817 if (gba->debugger) {
818 struct DebuggerEntryInfo info = {
819 .address = _ARMPCAddress(cpu),
820 .opcode = opcode
821 };
822 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP, &info);
823 } else {
824 ARMRaiseUndefined(cpu);
825 }
826}
827
828void GBABreakpoint(struct ARMCore* cpu, int immediate) {
829 struct GBA* gba = (struct GBA*) cpu->master;
830 if (immediate >= GBA_COMPONENT_MAX) {
831 return;
832 }
833 switch (immediate) {
834 case GBA_COMPONENT_DEBUGGER:
835 if (gba->debugger) {
836 struct DebuggerEntryInfo info = {
837 .address = _ARMPCAddress(cpu)
838 };
839 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_BREAKPOINT, &info);
840 }
841 break;
842 case GBA_COMPONENT_CHEAT_DEVICE:
843 if (gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE]) {
844 struct GBACheatDevice* device = (struct GBACheatDevice*) gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE];
845 struct GBACheatHook* hook = 0;
846 size_t i;
847 for (i = 0; i < GBACheatSetsSize(&device->cheats); ++i) {
848 struct GBACheatSet* cheats = *GBACheatSetsGetPointer(&device->cheats, i);
849 if (cheats->hook && cheats->hook->address == _ARMPCAddress(cpu)) {
850 GBACheatRefresh(device, cheats);
851 hook = cheats->hook;
852 }
853 }
854 if (hook) {
855 ARMRunFake(cpu, hook->patchedOpcode);
856 }
857 }
858 break;
859 default:
860 break;
861 }
862}
863
864void GBAFrameStarted(struct GBA* gba) {
865 UNUSED(gba);
866
867 struct GBAThread* thread = GBAThreadGetContext();
868 if (!thread) {
869 return;
870 }
871
872 if (thread->rewindBuffer) {
873 --thread->rewindBufferNext;
874 if (thread->rewindBufferNext <= 0) {
875 thread->rewindBufferNext = thread->rewindBufferInterval;
876 GBARecordFrame(thread);
877 }
878 }
879}
880
881void GBAFrameEnded(struct GBA* gba) {
882 GBASavedataClean(&gba->memory.savedata, gba->video.frameCounter);
883
884 if (gba->rr) {
885 gba->rr->nextFrame(gba->rr);
886 }
887
888 if (gba->cpu->components && gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE]) {
889 struct GBACheatDevice* device = (struct GBACheatDevice*) gba->cpu->components[GBA_COMPONENT_CHEAT_DEVICE];
890 size_t i;
891 for (i = 0; i < GBACheatSetsSize(&device->cheats); ++i) {
892 struct GBACheatSet* cheats = *GBACheatSetsGetPointer(&device->cheats, i);
893 if (!cheats->hook) {
894 GBACheatRefresh(device, cheats);
895 }
896 }
897 }
898
899 if (gba->stream && gba->stream->postVideoFrame) {
900 gba->stream->postVideoFrame(gba->stream, gba->video.renderer);
901 }
902
903 if (gba->memory.hw.devices & (HW_GB_PLAYER | HW_GB_PLAYER_DETECTION)) {
904 GBAHardwarePlayerUpdate(gba);
905 }
906
907 struct GBAThread* thread = GBAThreadGetContext();
908 if (!thread) {
909 return;
910 }
911
912 if (thread->frameCallback) {
913 thread->frameCallback(thread);
914 }
915}
916
917void GBASetBreakpoint(struct GBA* gba, struct ARMComponent* component, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
918 size_t immediate;
919 for (immediate = 0; immediate < gba->cpu->numComponents; ++immediate) {
920 if (gba->cpu->components[immediate] == component) {
921 break;
922 }
923 }
924 if (immediate == gba->cpu->numComponents) {
925 return;
926 }
927 if (mode == MODE_ARM) {
928 int32_t value;
929 int32_t old;
930 value = 0xE1200070;
931 value |= immediate & 0xF;
932 value |= (immediate & 0xFFF0) << 4;
933 GBAPatch32(gba->cpu, address, value, &old);
934 *opcode = old;
935 } else {
936 int16_t value;
937 int16_t old;
938 value = 0xBE00;
939 value |= immediate & 0xFF;
940 GBAPatch16(gba->cpu, address, value, &old);
941 *opcode = (uint16_t) old;
942 }
943}
944
945void GBAClearBreakpoint(struct GBA* gba, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
946 if (mode == MODE_ARM) {
947 GBAPatch32(gba->cpu, address, opcode, 0);
948 } else {
949 GBAPatch16(gba->cpu, address, opcode, 0);
950 }
951}
952
953#if (!defined(USE_PTHREADS) && !defined(_WIN32)) || defined(DISABLE_THREADING)
954struct GBAThread* GBAThreadGetContext(void) {
955 return 0;
956}
957#endif
958
959static bool _setSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
960 GBASetBreakpoint((struct GBA*) debugger->cpu->master, &debugger->d, address, mode, opcode);
961 return true;
962}
963
964static bool _clearSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
965 GBAClearBreakpoint((struct GBA*) debugger->cpu->master, address, mode, opcode);
966 return true;
967}