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 nextEvent = testEvent;
238 }
239
240 testEvent = GBAAudioProcessEvents(&gba->audio, cycles);
241 if (testEvent < nextEvent) {
242 nextEvent = testEvent;
243 }
244
245 testEvent = GBATimersProcessEvents(gba, cycles);
246 if (testEvent < nextEvent) {
247 nextEvent = testEvent;
248 }
249
250 testEvent = GBAMemoryRunDMAs(gba, cycles);
251 if (testEvent < nextEvent) {
252 nextEvent = testEvent;
253 }
254
255 testEvent = GBASIOProcessEvents(&gba->sio, cycles);
256 if (testEvent < nextEvent) {
257 nextEvent = testEvent;
258 }
259
260 cpu->cycles -= cycles;
261 cpu->nextEvent = nextEvent;
262
263 if (cpu->halted) {
264 cpu->cycles = cpu->nextEvent;
265 }
266 } while (cpu->cycles >= cpu->nextEvent);
267}
268
269static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
270 int32_t nextEvent = INT_MAX;
271 if (gba->timersEnabled) {
272 struct GBATimer* timer;
273 struct GBATimer* nextTimer;
274
275 timer = &gba->timers[0];
276 if (GBATimerFlagsIsEnable(timer->flags)) {
277 timer->nextEvent -= cycles;
278 timer->lastEvent -= cycles;
279 while (timer->nextEvent <= 0) {
280 timer->lastEvent = timer->nextEvent;
281 timer->nextEvent += timer->overflowInterval;
282 gba->memory.io[REG_TM0CNT_LO >> 1] = timer->reload;
283 timer->oldReload = timer->reload;
284
285 if (GBATimerFlagsIsDoIrq(timer->flags)) {
286 GBARaiseIRQ(gba, IRQ_TIMER0);
287 }
288
289 if (gba->audio.enable) {
290 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
291 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
292 }
293
294 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
295 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
296 }
297 }
298
299 nextTimer = &gba->timers[1];
300 if (GBATimerFlagsIsCountUp(nextTimer->flags)) {
301 ++gba->memory.io[REG_TM1CNT_LO >> 1];
302 if (!gba->memory.io[REG_TM1CNT_LO >> 1]) {
303 nextTimer->nextEvent = 0;
304 }
305 }
306 }
307 nextEvent = timer->nextEvent;
308 }
309
310 timer = &gba->timers[1];
311 if (GBATimerFlagsIsEnable(timer->flags)) {
312 timer->nextEvent -= cycles;
313 timer->lastEvent -= cycles;
314 if (timer->nextEvent <= 0) {
315 timer->lastEvent = timer->nextEvent;
316 timer->nextEvent += timer->overflowInterval;
317 gba->memory.io[REG_TM1CNT_LO >> 1] = timer->reload;
318 timer->oldReload = timer->reload;
319
320 if (GBATimerFlagsIsDoIrq(timer->flags)) {
321 GBARaiseIRQ(gba, IRQ_TIMER1);
322 }
323
324 if (gba->audio.enable) {
325 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
326 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
327 }
328
329 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
330 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
331 }
332 }
333
334 if (GBATimerFlagsIsCountUp(timer->flags)) {
335 timer->nextEvent = INT_MAX;
336 }
337
338 nextTimer = &gba->timers[2];
339 if (GBATimerFlagsIsCountUp(nextTimer->flags)) {
340 ++gba->memory.io[REG_TM2CNT_LO >> 1];
341 if (!gba->memory.io[REG_TM2CNT_LO >> 1]) {
342 nextTimer->nextEvent = 0;
343 }
344 }
345 }
346 if (timer->nextEvent < nextEvent) {
347 nextEvent = timer->nextEvent;
348 }
349 }
350
351 timer = &gba->timers[2];
352 if (GBATimerFlagsIsEnable(timer->flags)) {
353 timer->nextEvent -= cycles;
354 timer->lastEvent -= cycles;
355 if (timer->nextEvent <= 0) {
356 timer->lastEvent = timer->nextEvent;
357 timer->nextEvent += timer->overflowInterval;
358 gba->memory.io[REG_TM2CNT_LO >> 1] = timer->reload;
359 timer->oldReload = timer->reload;
360
361 if (GBATimerFlagsIsDoIrq(timer->flags)) {
362 GBARaiseIRQ(gba, IRQ_TIMER2);
363 }
364
365 if (GBATimerFlagsIsCountUp(timer->flags)) {
366 timer->nextEvent = INT_MAX;
367 }
368
369 nextTimer = &gba->timers[3];
370 if (GBATimerFlagsIsCountUp(nextTimer->flags)) {
371 ++gba->memory.io[REG_TM3CNT_LO >> 1];
372 if (!gba->memory.io[REG_TM3CNT_LO >> 1]) {
373 nextTimer->nextEvent = 0;
374 }
375 }
376 }
377 if (timer->nextEvent < nextEvent) {
378 nextEvent = timer->nextEvent;
379 }
380 }
381
382 timer = &gba->timers[3];
383 if (GBATimerFlagsIsEnable(timer->flags)) {
384 timer->nextEvent -= cycles;
385 timer->lastEvent -= cycles;
386 if (timer->nextEvent <= 0) {
387 timer->lastEvent = timer->nextEvent;
388 timer->nextEvent += timer->overflowInterval;
389 gba->memory.io[REG_TM3CNT_LO >> 1] = timer->reload;
390 timer->oldReload = timer->reload;
391
392 if (GBATimerFlagsIsDoIrq(timer->flags)) {
393 GBARaiseIRQ(gba, IRQ_TIMER3);
394 }
395
396 if (GBATimerFlagsIsCountUp(timer->flags)) {
397 timer->nextEvent = INT_MAX;
398 }
399 }
400 if (timer->nextEvent < nextEvent) {
401 nextEvent = timer->nextEvent;
402 }
403 }
404 }
405 return nextEvent;
406}
407
408void GBAAttachDebugger(struct GBA* gba, struct mDebugger* debugger) {
409 gba->debugger = (struct ARMDebugger*) debugger->platform;
410 gba->debugger->setSoftwareBreakpoint = _setSoftwareBreakpoint;
411 gba->debugger->clearSoftwareBreakpoint = _clearSoftwareBreakpoint;
412 gba->cpu->components[CPU_COMPONENT_DEBUGGER] = &debugger->d;
413 ARMHotplugAttach(gba->cpu, CPU_COMPONENT_DEBUGGER);
414}
415
416void GBADetachDebugger(struct GBA* gba) {
417 gba->debugger = 0;
418 ARMHotplugDetach(gba->cpu, CPU_COMPONENT_DEBUGGER);
419 gba->cpu->components[CPU_COMPONENT_DEBUGGER] = 0;
420}
421
422bool GBALoadMB(struct GBA* gba, struct VFile* vf) {
423 GBAUnloadROM(gba);
424 gba->romVf = vf;
425 gba->pristineRomSize = vf->size(vf);
426 vf->seek(vf, 0, SEEK_SET);
427 if (gba->pristineRomSize > SIZE_WORKING_RAM) {
428 gba->pristineRomSize = SIZE_WORKING_RAM;
429 }
430#ifdef _3DS
431 gba->pristineRom = 0;
432 if (gba->pristineRomSize <= romBufferSize) {
433 gba->pristineRom = romBuffer;
434 vf->read(vf, romBuffer, gba->pristineRomSize);
435 }
436#else
437 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
438#endif
439 if (!gba->pristineRom) {
440 mLOG(GBA, WARN, "Couldn't map ROM");
441 return false;
442 }
443 gba->yankedRomSize = 0;
444 gba->memory.romSize = 0;
445 gba->memory.romMask = 0;
446 gba->romCrc32 = doCrc32(gba->pristineRom, gba->pristineRomSize);
447 return true;
448}
449
450bool GBALoadROM(struct GBA* gba, struct VFile* vf) {
451 GBAUnloadROM(gba);
452 gba->romVf = vf;
453 gba->pristineRomSize = vf->size(vf);
454 vf->seek(vf, 0, SEEK_SET);
455 if (gba->pristineRomSize > SIZE_CART0) {
456 gba->pristineRomSize = SIZE_CART0;
457 }
458#ifdef _3DS
459 gba->pristineRom = 0;
460 if (gba->pristineRomSize <= romBufferSize) {
461 gba->pristineRom = romBuffer;
462 vf->read(vf, romBuffer, gba->pristineRomSize);
463 }
464#else
465 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
466#endif
467 if (!gba->pristineRom) {
468 mLOG(GBA, WARN, "Couldn't map ROM");
469 return false;
470 }
471 gba->yankedRomSize = 0;
472 gba->memory.rom = gba->pristineRom;
473 gba->memory.romSize = gba->pristineRomSize;
474 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
475 gba->memory.mirroring = false;
476 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
477 GBAHardwareInit(&gba->memory.hw, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
478 GBAVFameDetect(&gba->memory.vfame, gba->memory.rom, gba->memory.romSize);
479 // TODO: error check
480 return true;
481}
482
483bool GBALoadSave(struct GBA* gba, struct VFile* sav) {
484 GBASavedataInit(&gba->memory.savedata, sav);
485 return true;
486}
487
488void GBAYankROM(struct GBA* gba) {
489 gba->yankedRomSize = gba->memory.romSize;
490 gba->memory.romSize = 0;
491 gba->memory.romMask = 0;
492 GBARaiseIRQ(gba, IRQ_GAMEPAK);
493}
494
495void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
496 gba->biosVf = vf;
497 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
498 if (!bios) {
499 mLOG(GBA, WARN, "Couldn't map BIOS");
500 return;
501 }
502 gba->memory.bios = bios;
503 gba->memory.fullBios = 1;
504 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
505 mLOG(GBA, DEBUG, "BIOS Checksum: 0x%X", checksum);
506 if (checksum == GBA_BIOS_CHECKSUM) {
507 mLOG(GBA, INFO, "Official GBA BIOS detected");
508 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
509 mLOG(GBA, INFO, "Official GBA (DS) BIOS detected");
510 } else {
511 mLOG(GBA, WARN, "BIOS checksum incorrect");
512 }
513 gba->biosChecksum = checksum;
514 if (gba->memory.activeRegion == REGION_BIOS) {
515 gba->cpu->memory.activeRegion = gba->memory.bios;
516 }
517 // TODO: error check
518}
519
520void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
521 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
522 if (!patchedSize || patchedSize > SIZE_CART0) {
523 return;
524 }
525 gba->memory.rom = anonymousMemoryMap(SIZE_CART0);
526 if (!patch->applyPatch(patch, gba->pristineRom, gba->pristineRomSize, gba->memory.rom, patchedSize)) {
527 mappedMemoryFree(gba->memory.rom, patchedSize);
528 gba->memory.rom = gba->pristineRom;
529 return;
530 }
531 gba->memory.romSize = patchedSize;
532 gba->memory.romMask = SIZE_CART0 - 1;
533 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
534}
535
536void GBATimerUpdateRegister(struct GBA* gba, int timer) {
537 struct GBATimer* currentTimer = &gba->timers[timer];
538 if (GBATimerFlagsIsEnable(currentTimer->flags) && !GBATimerFlagsIsCountUp(currentTimer->flags)) {
539 int32_t prefetchSkew = 0;
540 if (gba->memory.lastPrefetchedPc >= (uint32_t) gba->cpu->gprs[ARM_PC]) {
541 prefetchSkew = (gba->memory.lastPrefetchedPc - gba->cpu->gprs[ARM_PC]) * (gba->cpu->memory.activeSeqCycles16 + 1) / WORD_SIZE_THUMB;
542 }
543 // Reading this takes two cycles (1N+1I), so let's remove them preemptively
544 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent - 2 + prefetchSkew) >> GBATimerFlagsGetPrescaleBits(currentTimer->flags));
545 }
546}
547
548void GBATimerWriteTMCNT_LO(struct GBA* gba, int timer, uint16_t reload) {
549 gba->timers[timer].reload = reload;
550 gba->timers[timer].overflowInterval = (0x10000 - gba->timers[timer].reload) << GBATimerFlagsGetPrescaleBits(gba->timers[timer].flags);
551}
552
553void GBATimerWriteTMCNT_HI(struct GBA* gba, int timer, uint16_t control) {
554 struct GBATimer* currentTimer = &gba->timers[timer];
555 GBATimerUpdateRegister(gba, timer);
556
557 unsigned oldPrescale = GBATimerFlagsGetPrescaleBits(currentTimer->flags);
558 switch (control & 0x0003) {
559 case 0x0000:
560 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 0);
561 break;
562 case 0x0001:
563 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 6);
564 break;
565 case 0x0002:
566 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 8);
567 break;
568 case 0x0003:
569 currentTimer->flags = GBATimerFlagsSetPrescaleBits(currentTimer->flags, 10);
570 break;
571 }
572 currentTimer->flags = GBATimerFlagsTestFillCountUp(currentTimer->flags, control & 0x0004);
573 currentTimer->flags = GBATimerFlagsTestFillDoIrq(currentTimer->flags, control & 0x0040);
574 currentTimer->overflowInterval = (0x10000 - currentTimer->reload) << GBATimerFlagsGetPrescaleBits(currentTimer->flags);
575 bool wasEnabled = GBATimerFlagsIsEnable(currentTimer->flags);
576 currentTimer->flags = GBATimerFlagsTestFillEnable(currentTimer->flags, control & 0x0080);
577 if (!wasEnabled && GBATimerFlagsIsEnable(currentTimer->flags)) {
578 if (!GBATimerFlagsIsCountUp(currentTimer->flags)) {
579 currentTimer->nextEvent = gba->cpu->cycles + currentTimer->overflowInterval;
580 } else {
581 currentTimer->nextEvent = INT_MAX;
582 }
583 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->reload;
584 currentTimer->oldReload = currentTimer->reload;
585 currentTimer->lastEvent = gba->cpu->cycles;
586 gba->timersEnabled |= 1 << timer;
587 } else if (wasEnabled && !GBATimerFlagsIsEnable(currentTimer->flags)) {
588 if (!GBATimerFlagsIsCountUp(currentTimer->flags)) {
589 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> oldPrescale);
590 }
591 gba->timersEnabled &= ~(1 << timer);
592 } else if (GBATimerFlagsGetPrescaleBits(currentTimer->flags) != oldPrescale && !GBATimerFlagsIsCountUp(currentTimer->flags)) {
593 // FIXME: this might be before present
594 currentTimer->nextEvent = currentTimer->lastEvent + currentTimer->overflowInterval;
595 }
596
597 if (currentTimer->nextEvent < gba->cpu->nextEvent) {
598 gba->cpu->nextEvent = currentTimer->nextEvent;
599 }
600};
601
602void GBAWriteIE(struct GBA* gba, uint16_t value) {
603 if (value & (1 << IRQ_KEYPAD)) {
604 mLOG(GBA, STUB, "Keypad interrupts not implemented");
605 }
606
607 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
608 ARMRaiseIRQ(gba->cpu);
609 }
610}
611
612void GBAWriteIME(struct GBA* gba, uint16_t value) {
613 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
614 ARMRaiseIRQ(gba->cpu);
615 }
616}
617
618void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
619 gba->memory.io[REG_IF >> 1] |= 1 << irq;
620 gba->cpu->halted = 0;
621
622 if (gba->memory.io[REG_IME >> 1] && (gba->memory.io[REG_IE >> 1] & 1 << irq)) {
623 ARMRaiseIRQ(gba->cpu);
624 }
625}
626
627void GBATestIRQ(struct ARMCore* cpu) {
628 struct GBA* gba = (struct GBA*) cpu->master;
629 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
630 gba->springIRQ = 1;
631 gba->cpu->nextEvent = gba->cpu->cycles;
632 }
633}
634
635void GBAHalt(struct GBA* gba) {
636 gba->cpu->nextEvent = gba->cpu->cycles;
637 gba->cpu->halted = 1;
638}
639
640void GBAStop(struct GBA* gba) {
641 if (!gba->stopCallback) {
642 return;
643 }
644 gba->cpu->nextEvent = gba->cpu->cycles;
645 gba->stopCallback->stop(gba->stopCallback);
646}
647
648bool GBAIsROM(struct VFile* vf) {
649 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
650 return false;
651 }
652 uint8_t signature[sizeof(GBA_ROM_MAGIC)];
653 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
654 return false;
655 }
656 if (GBAIsBIOS(vf)) {
657 return false;
658 }
659 return memcmp(signature, GBA_ROM_MAGIC, sizeof(signature)) == 0;
660}
661
662bool GBAIsMB(struct VFile* vf) {
663 if (!GBAIsROM(vf)) {
664 return false;
665 }
666 if (vf->size(vf) > SIZE_WORKING_RAM) {
667 return false;
668 }
669 if (vf->seek(vf, GBA_MB_MAGIC_OFFSET, SEEK_SET) < 0) {
670 return false;
671 }
672 uint32_t signature;
673 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
674 return false;
675 }
676 uint32_t opcode;
677 LOAD_32(opcode, 0, &signature);
678 struct ARMInstructionInfo info;
679 ARMDecodeARM(opcode, &info);
680 if (info.branchType != ARM_BRANCH) {
681 return false;
682 }
683 if (info.op1.immediate <= 0) {
684 return false;
685 } else if (info.op1.immediate == 28) {
686 // Ancient toolchain that is known to throw MB detection for a loop
687 return false;
688 } else if (info.op1.immediate != 24) {
689 return true;
690 }
691 // Found a libgba-linked cart...these are a bit harder to detect.
692 return false;
693}
694
695bool GBAIsBIOS(struct VFile* vf) {
696 if (vf->seek(vf, 0, SEEK_SET) < 0) {
697 return false;
698 }
699 uint8_t interruptTable[7 * 4];
700 if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
701 return false;
702 }
703 int i;
704 for (i = 0; i < 7; ++i) {
705 if (interruptTable[4 * i + 3] != 0xEA || interruptTable[4 * i + 2]) {
706 return false;
707 }
708 }
709 return true;
710}
711
712void GBAGetGameCode(struct GBA* gba, char* out) {
713 memset(out, 0, 8);
714 if (!gba->memory.rom) {
715 return;
716 }
717
718 memcpy(out, "AGB-", 4);
719 memcpy(&out[4], &((struct GBACartridge*) gba->memory.rom)->id, 4);
720}
721
722void GBAGetGameTitle(struct GBA* gba, char* out) {
723 if (gba->memory.rom) {
724 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
725 return;
726 }
727 if (gba->pristineRom) {
728 memcpy(out, &((struct GBACartridge*) gba->pristineRom)->title, 12);
729 return;
730 }
731 strncpy(out, "(BIOS)", 12);
732}
733
734void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
735 struct GBA* gba = (struct GBA*) cpu->master;
736 if (gba->debugger) {
737 struct mDebuggerEntryInfo info = {
738 .address = _ARMPCAddress(cpu),
739 .opcode = opcode
740 };
741 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_ILLEGAL_OP, &info);
742 }
743 // TODO: More sensible category?
744 mLOG(GBA, ERROR, "Stub opcode: %08x", opcode);
745}
746
747void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
748 struct GBA* gba = (struct GBA*) cpu->master;
749 if (!gba->yankedRomSize) {
750 // TODO: More sensible category?
751 mLOG(GBA, WARN, "Illegal opcode: %08x", opcode);
752 }
753 if (gba->debugger) {
754 struct mDebuggerEntryInfo info = {
755 .address = _ARMPCAddress(cpu),
756 .opcode = opcode
757 };
758 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_ILLEGAL_OP, &info);
759 } else {
760 ARMRaiseUndefined(cpu);
761 }
762}
763
764void GBABreakpoint(struct ARMCore* cpu, int immediate) {
765 struct GBA* gba = (struct GBA*) cpu->master;
766 if (immediate >= CPU_COMPONENT_MAX) {
767 return;
768 }
769 switch (immediate) {
770 case CPU_COMPONENT_DEBUGGER:
771 if (gba->debugger) {
772 struct mDebuggerEntryInfo info = {
773 .address = _ARMPCAddress(cpu)
774 };
775 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_BREAKPOINT, &info);
776 }
777 break;
778 case CPU_COMPONENT_CHEAT_DEVICE:
779 if (gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
780 struct mCheatDevice* device = (struct mCheatDevice*) gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
781 struct GBACheatHook* hook = 0;
782 size_t i;
783 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
784 struct GBACheatSet* cheats = (struct GBACheatSet*) *mCheatSetsGetPointer(&device->cheats, i);
785 if (cheats->hook && cheats->hook->address == _ARMPCAddress(cpu)) {
786 mCheatRefresh(device, &cheats->d);
787 hook = cheats->hook;
788 }
789 }
790 if (hook) {
791 ARMRunFake(cpu, hook->patchedOpcode);
792 }
793 }
794 break;
795 default:
796 break;
797 }
798}
799
800void GBAFrameStarted(struct GBA* gba) {
801 UNUSED(gba);
802
803 // TODO: Put back rewind
804}
805
806void GBAFrameEnded(struct GBA* gba) {
807 GBASavedataClean(&gba->memory.savedata, gba->video.frameCounter);
808
809 if (gba->rr) {
810 gba->rr->nextFrame(gba->rr);
811 }
812
813 if (gba->cpu->components && gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
814 struct mCheatDevice* device = (struct mCheatDevice*) gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
815 size_t i;
816 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
817 struct GBACheatSet* cheats = (struct GBACheatSet*) *mCheatSetsGetPointer(&device->cheats, i);
818 mCheatRefresh(device, &cheats->d);
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}