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