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