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