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 <mgba/internal/gba/gba.h>
7
8#include <mgba/internal/arm/isa-inlines.h>
9#include <mgba/internal/arm/debugger/debugger.h>
10#include <mgba/internal/arm/decoder.h>
11
12#include <mgba/internal/gba/bios.h>
13#include <mgba/internal/gba/cheats.h>
14#include <mgba/internal/gba/io.h>
15#include <mgba/internal/gba/overrides.h>
16#include <mgba/internal/gba/rr/rr.h>
17
18#include <mgba-util/patch.h>
19#include <mgba-util/crc32.h>
20#include <mgba-util/math.h>
21#include <mgba-util/memory.h>
22#include <mgba-util/vfs.h>
23
24#ifdef USE_ELF
25#include <mgba-util/elf-read.h>
26#endif
27
28#define GBA_IRQ_DELAY 7
29
30mLOG_DEFINE_CATEGORY(GBA, "GBA", "gba");
31mLOG_DEFINE_CATEGORY(GBA_DEBUG, "GBA Debug", "gba.debug");
32
33const uint32_t GBA_COMPONENT_MAGIC = 0x1000000;
34
35static const size_t GBA_ROM_MAGIC_OFFSET = 3;
36static const uint8_t GBA_ROM_MAGIC[] = { 0xEA };
37
38static const size_t GBA_ROM_MAGIC_OFFSET2 = 0xB2;
39static const uint8_t GBA_ROM_MAGIC2[] = { 0x96 };
40
41static const size_t GBA_MB_MAGIC_OFFSET = 0xC0;
42
43static void GBAInit(void* cpu, struct mCPUComponent* component);
44static void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh);
45static void GBAProcessEvents(struct ARMCore* cpu);
46static void GBAHitStub(struct ARMCore* cpu, uint32_t opcode);
47static void GBAIllegal(struct ARMCore* cpu, uint32_t opcode);
48static void GBABreakpoint(struct ARMCore* cpu, int immediate);
49static void GBATestIRQNoDelay(struct ARMCore* cpu);
50
51static void _triggerIRQ(struct mTiming*, void* user, uint32_t cyclesLate);
52
53#ifdef USE_DEBUGGERS
54static bool _setSoftwareBreakpoint(struct ARMDebugger*, uint32_t address, enum ExecutionMode mode, uint32_t* opcode);
55static bool _clearSoftwareBreakpoint(struct ARMDebugger*, uint32_t address, enum ExecutionMode mode, uint32_t opcode);
56#endif
57
58#ifdef FIXED_ROM_BUFFER
59extern uint32_t* romBuffer;
60extern size_t romBufferSize;
61#endif
62
63void GBACreate(struct GBA* gba) {
64 gba->d.id = GBA_COMPONENT_MAGIC;
65 gba->d.init = GBAInit;
66 gba->d.deinit = 0;
67}
68
69static void GBAInit(void* cpu, struct mCPUComponent* component) {
70 struct GBA* gba = (struct GBA*) component;
71 gba->cpu = cpu;
72 gba->debugger = 0;
73 gba->sync = 0;
74
75 GBAInterruptHandlerInit(&gba->cpu->irqh);
76 GBAMemoryInit(gba);
77
78 gba->memory.savedata.timing = &gba->timing;
79 GBASavedataInit(&gba->memory.savedata, NULL);
80
81 gba->video.p = gba;
82 GBAVideoInit(&gba->video);
83
84 gba->audio.p = gba;
85 GBAAudioInit(&gba->audio, GBA_AUDIO_SAMPLES);
86
87 GBAIOInit(gba);
88
89 gba->sio.p = gba;
90 GBASIOInit(&gba->sio);
91
92 GBAHardwareInit(&gba->memory.hw, NULL);
93
94 gba->keySource = 0;
95 gba->rotationSource = 0;
96 gba->luminanceSource = 0;
97 gba->rtcSource = 0;
98 gba->rumble = 0;
99 gba->rr = 0;
100
101 gba->romVf = 0;
102 gba->biosVf = 0;
103
104 gba->stream = NULL;
105 gba->keyCallback = NULL;
106 mCoreCallbacksListInit(&gba->coreCallbacks, 0);
107
108 gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
109
110 gba->idleOptimization = IDLE_LOOP_REMOVE;
111 gba->idleLoop = IDLE_LOOP_NONE;
112
113 gba->hardCrash = true;
114 gba->allowOpposingDirections = true;
115
116 gba->performingDMA = false;
117
118 gba->isPristine = false;
119 gba->pristineRomSize = 0;
120 gba->yankedRomSize = 0;
121
122 mTimingInit(&gba->timing, &gba->cpu->cycles, &gba->cpu->nextEvent);
123
124 gba->irqEvent.name = "GBA IRQ Event";
125 gba->irqEvent.callback = _triggerIRQ;
126 gba->irqEvent.context = gba;
127 gba->irqEvent.priority = 0;
128}
129
130void GBAUnloadROM(struct GBA* gba) {
131 if (gba->memory.rom && !gba->isPristine) {
132 if (gba->yankedRomSize) {
133 gba->yankedRomSize = 0;
134 }
135 mappedMemoryFree(gba->memory.rom, SIZE_CART0);
136 }
137
138 if (gba->romVf) {
139#ifndef FIXED_ROM_BUFFER
140 if (gba->isPristine) {
141 gba->romVf->unmap(gba->romVf, gba->memory.rom, gba->pristineRomSize);
142 }
143#endif
144 gba->romVf->close(gba->romVf);
145 gba->romVf = NULL;
146 }
147 gba->memory.rom = NULL;
148 gba->isPristine = false;
149
150 gba->memory.savedata.maskWriteback = false;
151 GBASavedataUnmask(&gba->memory.savedata);
152 GBASavedataDeinit(&gba->memory.savedata);
153 if (gba->memory.savedata.realVf) {
154 gba->memory.savedata.realVf->close(gba->memory.savedata.realVf);
155 gba->memory.savedata.realVf = 0;
156 }
157 gba->idleLoop = IDLE_LOOP_NONE;
158}
159
160void GBADestroy(struct GBA* gba) {
161 GBAUnloadROM(gba);
162
163 if (gba->biosVf) {
164 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
165 gba->biosVf->close(gba->biosVf);
166 gba->biosVf = 0;
167 }
168
169 GBAMemoryDeinit(gba);
170 GBAVideoDeinit(&gba->video);
171 GBAAudioDeinit(&gba->audio);
172 GBASIODeinit(&gba->sio);
173 gba->rr = 0;
174 mTimingDeinit(&gba->timing);
175 mCoreCallbacksListDeinit(&gba->coreCallbacks);
176}
177
178void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
179 irqh->reset = GBAReset;
180 irqh->processEvents = GBAProcessEvents;
181 irqh->swi16 = GBASwi16;
182 irqh->swi32 = GBASwi32;
183 irqh->hitIllegal = GBAIllegal;
184 irqh->readCPSR = GBATestIRQNoDelay;
185 irqh->hitStub = GBAHitStub;
186 irqh->bkpt16 = GBABreakpoint;
187 irqh->bkpt32 = GBABreakpoint;
188}
189
190void GBAReset(struct ARMCore* cpu) {
191 ARMSetPrivilegeMode(cpu, MODE_IRQ);
192 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
193 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
194 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
195 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
196 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
197
198 struct GBA* gba = (struct GBA*) cpu->master;
199 if (!gba->rr || (!gba->rr->isPlaying(gba->rr) && !gba->rr->isRecording(gba->rr))) {
200 gba->memory.savedata.maskWriteback = false;
201 GBASavedataUnmask(&gba->memory.savedata);
202 }
203
204 gba->cpuBlocked = false;
205 gba->earlyExit = false;
206 if (gba->yankedRomSize) {
207 gba->memory.romSize = gba->yankedRomSize;
208 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
209 gba->yankedRomSize = 0;
210 }
211 mTimingClear(&gba->timing);
212 GBAMemoryReset(gba);
213 GBAVideoReset(&gba->video);
214 GBAAudioReset(&gba->audio);
215 GBAIOInit(gba);
216 GBATimerInit(gba);
217
218 GBASIOReset(&gba->sio);
219
220 bool isELF = false;
221#ifdef USE_ELF
222 struct ELF* elf = ELFOpen(gba->romVf);
223 if (elf) {
224 isELF = true;
225 ELFClose(elf);
226 }
227#endif
228
229 if (GBAIsMB(gba->romVf) && !isELF) {
230 gba->romVf->seek(gba->romVf, 0, SEEK_SET);
231 gba->romVf->read(gba->romVf, gba->memory.wram, gba->pristineRomSize);
232 }
233
234 gba->lastJump = 0;
235 gba->haltPending = false;
236 gba->idleDetectionStep = 0;
237 gba->idleDetectionFailures = 0;
238
239 gba->debug = false;
240 memset(gba->debugString, 0, sizeof(gba->debugString));
241
242
243 if (gba->romVf && gba->pristineRomSize > SIZE_CART0) {
244 char ident;
245 gba->romVf->seek(gba->romVf, 0xAC, SEEK_SET);
246 gba->romVf->read(gba->romVf, &ident, 1);
247 gba->romVf->seek(gba->romVf, 0, SEEK_SET);
248 if (ident == 'M') {
249 GBAMatrixReset(gba);
250 }
251 }
252}
253
254void GBASkipBIOS(struct GBA* gba) {
255 struct ARMCore* cpu = gba->cpu;
256 if (cpu->gprs[ARM_PC] == BASE_RESET + WORD_SIZE_ARM) {
257 if (gba->memory.rom) {
258 cpu->gprs[ARM_PC] = BASE_CART0;
259 } else {
260 cpu->gprs[ARM_PC] = BASE_WORKING_RAM;
261 }
262 gba->video.vcount = 0x7D;
263 gba->memory.io[REG_VCOUNT >> 1] = 0x7D;
264 gba->memory.io[REG_POSTFLG >> 1] = 1;
265 ARMWritePC(cpu);
266 }
267}
268
269static void GBAProcessEvents(struct ARMCore* cpu) {
270 struct GBA* gba = (struct GBA*) cpu->master;
271
272 gba->bus = cpu->prefetch[1];
273 if (cpu->executionMode == MODE_THUMB) {
274 gba->bus |= cpu->prefetch[1] << 16;
275 }
276
277 int32_t nextEvent = cpu->nextEvent;
278 while (cpu->cycles >= nextEvent) {
279 cpu->nextEvent = INT_MAX;
280 nextEvent = 0;
281 do {
282 int32_t cycles = cpu->cycles;
283 cpu->cycles = 0;
284#ifndef NDEBUG
285 if (cycles < 0) {
286 mLOG(GBA, FATAL, "Negative cycles passed: %i", cycles);
287 }
288#endif
289 nextEvent = mTimingTick(&gba->timing, nextEvent + cycles);
290 } while (gba->cpuBlocked);
291
292 cpu->nextEvent = nextEvent;
293 if (cpu->halted) {
294 cpu->cycles = nextEvent;
295 if (!gba->memory.io[REG_IME >> 1] || !gba->memory.io[REG_IE >> 1]) {
296 break;
297 }
298 }
299#ifndef NDEBUG
300 else if (nextEvent < 0) {
301 mLOG(GBA, FATAL, "Negative cycles will pass: %i", nextEvent);
302 }
303#endif
304 if (gba->earlyExit) {
305 break;
306 }
307 }
308 gba->earlyExit = false;
309#ifndef NDEBUG
310 if (gba->cpuBlocked) {
311 mLOG(GBA, FATAL, "CPU is blocked!");
312 }
313#endif
314}
315
316#ifdef USE_DEBUGGERS
317void GBAAttachDebugger(struct GBA* gba, struct mDebugger* debugger) {
318 gba->debugger = (struct ARMDebugger*) debugger->platform;
319 gba->debugger->setSoftwareBreakpoint = _setSoftwareBreakpoint;
320 gba->debugger->clearSoftwareBreakpoint = _clearSoftwareBreakpoint;
321 gba->cpu->components[CPU_COMPONENT_DEBUGGER] = &debugger->d;
322 ARMHotplugAttach(gba->cpu, CPU_COMPONENT_DEBUGGER);
323}
324
325void GBADetachDebugger(struct GBA* gba) {
326 if (gba->debugger) {
327 ARMHotplugDetach(gba->cpu, CPU_COMPONENT_DEBUGGER);
328 }
329 gba->cpu->components[CPU_COMPONENT_DEBUGGER] = NULL;
330 gba->debugger = NULL;
331}
332#endif
333
334bool GBALoadNull(struct GBA* gba) {
335 GBAUnloadROM(gba);
336 gba->romVf = NULL;
337 gba->pristineRomSize = 0;
338#ifndef FIXED_ROM_BUFFER
339 gba->memory.rom = anonymousMemoryMap(SIZE_CART0);
340#else
341 gba->memory.rom = romBuffer;
342#endif
343 gba->isPristine = false;
344 gba->yankedRomSize = 0;
345 gba->memory.romSize = SIZE_CART0;
346 gba->memory.romMask = SIZE_CART0 - 1;
347 gba->memory.mirroring = false;
348 gba->romCrc32 = 0;
349
350 if (gba->cpu) {
351 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
352 }
353 GBAHardwareInit(&gba->memory.hw, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
354 return true;
355}
356
357bool GBALoadMB(struct GBA* gba, struct VFile* vf) {
358 GBAUnloadROM(gba);
359 gba->romVf = vf;
360 gba->pristineRomSize = vf->size(vf);
361 vf->seek(vf, 0, SEEK_SET);
362 if (gba->pristineRomSize > SIZE_WORKING_RAM) {
363 gba->pristineRomSize = SIZE_WORKING_RAM;
364 }
365 gba->isPristine = true;
366 memset(gba->memory.wram, 0, SIZE_WORKING_RAM);
367 gba->yankedRomSize = 0;
368 gba->memory.romSize = 0;
369 gba->memory.romMask = 0;
370 gba->romCrc32 = doCrc32(gba->memory.wram, gba->pristineRomSize);
371 if (gba->cpu && gba->memory.activeRegion == REGION_WORKING_RAM) {
372 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
373 }
374 return true;
375}
376
377bool GBALoadROM(struct GBA* gba, struct VFile* vf) {
378 if (!vf) {
379 return false;
380 }
381 GBAUnloadROM(gba);
382 gba->romVf = vf;
383 gba->pristineRomSize = vf->size(vf);
384 vf->seek(vf, 0, SEEK_SET);
385 if (gba->pristineRomSize > SIZE_CART0) {
386 gba->isPristine = false;
387 char ident;
388 vf->seek(vf, 0xAC, SEEK_SET);
389 vf->read(vf, &ident, 1);
390 if (ident == 'M') {
391 gba->memory.romSize = 0x01000000;
392#ifdef FIXED_ROM_BUFFER
393 gba->memory.rom = romBuffer;
394#else
395 gba->memory.rom = anonymousMemoryMap(SIZE_CART0);
396#endif
397 } else {
398 gba->memory.rom = vf->map(vf, SIZE_CART0, MAP_READ);
399 gba->memory.romSize = SIZE_CART0;
400 }
401 } else {
402 gba->isPristine = true;
403 gba->memory.rom = vf->map(vf, gba->pristineRomSize, MAP_READ);
404 gba->memory.romSize = gba->pristineRomSize;
405 }
406 if (!gba->memory.rom) {
407 mLOG(GBA, WARN, "Couldn't map ROM");
408 return false;
409 }
410 gba->yankedRomSize = 0;
411 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
412 gba->memory.mirroring = false;
413 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
414 if (popcount32(gba->memory.romSize) != 1) {
415 // This ROM is either a bad dump or homebrew. Emulate flash cart behavior.
416#ifndef FIXED_ROM_BUFFER
417 void* newRom = anonymousMemoryMap(SIZE_CART0);
418 memcpy(newRom, gba->memory.rom, gba->pristineRomSize);
419 gba->memory.rom = newRom;
420#endif
421 gba->memory.romSize = SIZE_CART0;
422 gba->memory.romMask = SIZE_CART0 - 1;
423 gba->isPristine = false;
424 }
425 if (gba->cpu && gba->memory.activeRegion >= REGION_CART0) {
426 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
427 }
428 GBAHardwareInit(&gba->memory.hw, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
429 GBAVFameDetect(&gba->memory.vfame, gba->memory.rom, gba->memory.romSize);
430 // TODO: error check
431 return true;
432}
433
434bool GBALoadSave(struct GBA* gba, struct VFile* sav) {
435 GBASavedataInit(&gba->memory.savedata, sav);
436 return true;
437}
438
439void GBAYankROM(struct GBA* gba) {
440 gba->yankedRomSize = gba->memory.romSize;
441 gba->memory.romSize = 0;
442 gba->memory.romMask = 0;
443 GBARaiseIRQ(gba, IRQ_GAMEPAK, 0);
444}
445
446void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
447 gba->biosVf = vf;
448 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
449 if (!bios) {
450 mLOG(GBA, WARN, "Couldn't map BIOS");
451 return;
452 }
453 gba->memory.bios = bios;
454 gba->memory.fullBios = 1;
455 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
456 mLOG(GBA, DEBUG, "BIOS Checksum: 0x%X", checksum);
457 if (checksum == GBA_BIOS_CHECKSUM) {
458 mLOG(GBA, INFO, "Official GBA BIOS detected");
459 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
460 mLOG(GBA, INFO, "Official GBA (DS) BIOS detected");
461 } else {
462 mLOG(GBA, WARN, "BIOS checksum incorrect");
463 }
464 gba->biosChecksum = checksum;
465 if (gba->memory.activeRegion == REGION_BIOS) {
466 gba->cpu->memory.activeRegion = gba->memory.bios;
467 }
468 // TODO: error check
469}
470
471void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
472 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
473 if (!patchedSize || patchedSize > SIZE_CART0) {
474 return;
475 }
476 void* newRom = anonymousMemoryMap(SIZE_CART0);
477 if (!patch->applyPatch(patch, gba->memory.rom, gba->pristineRomSize, newRom, patchedSize)) {
478 mappedMemoryFree(newRom, SIZE_CART0);
479 return;
480 }
481 if (gba->romVf) {
482#ifndef FIXED_ROM_BUFFER
483 gba->romVf->unmap(gba->romVf, gba->memory.rom, gba->pristineRomSize);
484#endif
485 gba->romVf->close(gba->romVf);
486 gba->romVf = NULL;
487 }
488 gba->isPristine = false;
489 gba->memory.rom = newRom;
490 gba->memory.hw.gpioBase = &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1];
491 gba->memory.romSize = patchedSize;
492 gba->memory.romMask = SIZE_CART0 - 1;
493 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
494}
495
496void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq, uint32_t cyclesLate) {
497 gba->memory.io[REG_IF >> 1] |= 1 << irq;
498 GBATestIRQ(gba, cyclesLate);
499}
500
501void GBATestIRQNoDelay(struct ARMCore* cpu) {
502 struct GBA* gba = (struct GBA*) cpu->master;
503 GBATestIRQ(gba, 0);
504}
505
506void GBATestIRQ(struct GBA* gba, uint32_t cyclesLate) {
507 if (gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
508 if (!mTimingIsScheduled(&gba->timing, &gba->irqEvent)) {
509 mTimingSchedule(&gba->timing, &gba->irqEvent, GBA_IRQ_DELAY - cyclesLate);
510 }
511 }
512}
513
514void GBAHalt(struct GBA* gba) {
515 gba->cpu->nextEvent = gba->cpu->cycles;
516 gba->cpu->halted = 1;
517}
518
519void GBAStop(struct GBA* gba) {
520 size_t c;
521 for (c = 0; c < mCoreCallbacksListSize(&gba->coreCallbacks); ++c) {
522 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gba->coreCallbacks, c);
523 if (callbacks->sleep) {
524 callbacks->sleep(callbacks->context);
525 }
526 }
527 gba->cpu->nextEvent = gba->cpu->cycles;
528}
529
530void GBADebug(struct GBA* gba, uint16_t flags) {
531 gba->debugFlags = flags;
532 if (GBADebugFlagsIsSend(gba->debugFlags)) {
533 int level = 1 << GBADebugFlagsGetLevel(gba->debugFlags);
534 level &= 0x1F;
535 char oolBuf[0x101];
536 strncpy(oolBuf, gba->debugString, sizeof(oolBuf) - 1);
537 memset(gba->debugString, 0, sizeof(gba->debugString));
538 oolBuf[0x100] = '\0';
539 mLog(_mLOG_CAT_GBA_DEBUG, level, "%s", oolBuf);
540 }
541 gba->debugFlags = GBADebugFlagsClearSend(gba->debugFlags);
542}
543
544bool GBAIsROM(struct VFile* vf) {
545#ifdef USE_ELF
546 struct ELF* elf = ELFOpen(vf);
547 if (elf) {
548 uint32_t entry = ELFEntry(elf);
549 bool isGBA = true;
550 isGBA = isGBA && ELFMachine(elf) == EM_ARM;
551 isGBA = isGBA && (entry == BASE_CART0 || entry == BASE_WORKING_RAM);
552 ELFClose(elf);
553 return isGBA;
554 }
555#endif
556 if (!vf) {
557 return false;
558 }
559
560 uint8_t signature[sizeof(GBA_ROM_MAGIC) + sizeof(GBA_ROM_MAGIC2)];
561 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
562 return false;
563 }
564 if (vf->read(vf, &signature, sizeof(GBA_ROM_MAGIC)) != sizeof(GBA_ROM_MAGIC)) {
565 return false;
566 }
567 if (memcmp(signature, GBA_ROM_MAGIC, sizeof(GBA_ROM_MAGIC)) != 0) {
568 return false;
569 }
570
571 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET2, SEEK_SET) < 0) {
572 return false;
573 }
574 if (vf->read(vf, &signature, sizeof(GBA_ROM_MAGIC2)) != sizeof(GBA_ROM_MAGIC2)) {
575 return false;
576 }
577 if (memcmp(signature, GBA_ROM_MAGIC2, sizeof(GBA_ROM_MAGIC2)) != 0) {
578 // If the signature byte is missing then we must be using an unfixed ROM
579 uint32_t buffer[0x9C / sizeof(uint32_t)];
580 if (vf->seek(vf, 0x4, SEEK_SET) < 0) {
581 return false;
582 }
583 if (vf->read(vf, &buffer, sizeof(buffer)) != sizeof(buffer)) {
584 return false;
585 }
586 uint32_t bits = 0;
587 size_t i;
588 for (i = 0; i < sizeof(buffer) / sizeof(*buffer); ++i) {
589 bits |= buffer[i];
590 }
591 if (bits) {
592 return false;
593 }
594 }
595
596
597 if (GBAIsBIOS(vf)) {
598 return false;
599 }
600 return true;
601}
602
603bool GBAIsMB(struct VFile* vf) {
604 if (!GBAIsROM(vf)) {
605 return false;
606 }
607#ifdef USE_ELF
608 struct ELF* elf = ELFOpen(vf);
609 if (elf) {
610 bool isMB = ELFEntry(elf) == BASE_WORKING_RAM;
611 ELFClose(elf);
612 return isMB;
613 }
614#endif
615 if (vf->size(vf) > SIZE_WORKING_RAM) {
616 return false;
617 }
618 if (vf->seek(vf, GBA_MB_MAGIC_OFFSET, SEEK_SET) < 0) {
619 return false;
620 }
621 uint32_t signature;
622 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
623 return false;
624 }
625 uint32_t opcode;
626 LOAD_32(opcode, 0, &signature);
627 struct ARMInstructionInfo info;
628 ARMDecodeARM(opcode, &info);
629 if (info.branchType == ARM_BRANCH) {
630 if (info.op1.immediate <= 0) {
631 return false;
632 } else if (info.op1.immediate == 28) {
633 // Ancient toolchain that is known to throw MB detection for a loop
634 return false;
635 } else if (info.op1.immediate != 24) {
636 return true;
637 }
638 }
639
640 uint32_t pc = GBA_MB_MAGIC_OFFSET;
641 int i;
642 for (i = 0; i < 80; ++i) {
643 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
644 break;
645 }
646 pc += 4;
647 LOAD_32(opcode, 0, &signature);
648 ARMDecodeARM(opcode, &info);
649 if (info.mnemonic != ARM_MN_LDR) {
650 continue;
651 }
652 if ((info.operandFormat & ARM_OPERAND_MEMORY) && info.memory.baseReg == ARM_PC && info.memory.format & ARM_MEMORY_IMMEDIATE_OFFSET) {
653 uint32_t immediate = info.memory.offset.immediate;
654 if (info.memory.format & ARM_MEMORY_OFFSET_SUBTRACT) {
655 immediate = -immediate;
656 }
657 immediate += pc + 8;
658 if (vf->seek(vf, immediate, SEEK_SET) < 0) {
659 break;
660 }
661 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
662 break;
663 }
664 LOAD_32(immediate, 0, &signature);
665 if (vf->seek(vf, pc, SEEK_SET) < 0) {
666 break;
667 }
668 if ((immediate & ~0x7FF) == BASE_WORKING_RAM) {
669 return true;
670 }
671 }
672 }
673 // Found a libgba-linked cart...these are a bit harder to detect.
674 return false;
675}
676
677bool GBAIsBIOS(struct VFile* vf) {
678 if (vf->seek(vf, 0, SEEK_SET) < 0) {
679 return false;
680 }
681 uint8_t interruptTable[7 * 4];
682 if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
683 return false;
684 }
685 int i;
686 for (i = 0; i < 7; ++i) {
687 if (interruptTable[4 * i + 3] != 0xEA || interruptTable[4 * i + 2]) {
688 return false;
689 }
690 }
691 return true;
692}
693
694void GBAGetGameCode(const struct GBA* gba, char* out) {
695 memset(out, 0, 8);
696 if (!gba->memory.rom) {
697 return;
698 }
699
700 memcpy(out, "AGB-", 4);
701 memcpy(&out[4], &((struct GBACartridge*) gba->memory.rom)->id, 4);
702}
703
704void GBAGetGameTitle(const struct GBA* gba, char* out) {
705 if (gba->memory.rom) {
706 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
707 return;
708 }
709 if (gba->isPristine && gba->memory.wram) {
710 memcpy(out, &((struct GBACartridge*) gba->memory.wram)->title, 12);
711 return;
712 }
713 strncpy(out, "(BIOS)", 12);
714}
715
716void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
717 struct GBA* gba = (struct GBA*) cpu->master;
718 UNUSED(gba);
719#ifdef USE_DEBUGGERS
720 if (gba->debugger) {
721 struct mDebuggerEntryInfo info = {
722 .address = _ARMPCAddress(cpu),
723 .type.bp.opcode = opcode
724 };
725 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_ILLEGAL_OP, &info);
726 }
727#endif
728 // TODO: More sensible category?
729 mLOG(GBA, ERROR, "Stub opcode: %08x", opcode);
730}
731
732void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
733 struct GBA* gba = (struct GBA*) cpu->master;
734 if (!gba->yankedRomSize) {
735 // TODO: More sensible category?
736 mLOG(GBA, WARN, "Illegal opcode: %08x", opcode);
737 }
738 if (cpu->executionMode == MODE_THUMB && (opcode & 0xFFC0) == 0xE800) {
739 mLOG(GBA, DEBUG, "Hit Wii U VC opcode: %08x", opcode);
740 return;
741 }
742#ifdef USE_DEBUGGERS
743 if (gba->debugger) {
744 struct mDebuggerEntryInfo info = {
745 .address = _ARMPCAddress(cpu),
746 .type.bp.opcode = opcode
747 };
748 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_ILLEGAL_OP, &info);
749 } else
750#endif
751 {
752 ARMRaiseUndefined(cpu);
753 }
754}
755
756void GBABreakpoint(struct ARMCore* cpu, int immediate) {
757 struct GBA* gba = (struct GBA*) cpu->master;
758 if (immediate >= CPU_COMPONENT_MAX) {
759 return;
760 }
761 switch (immediate) {
762#ifdef USE_DEBUGGERS
763 case CPU_COMPONENT_DEBUGGER:
764 if (gba->debugger) {
765 struct mDebuggerEntryInfo info = {
766 .address = _ARMPCAddress(cpu),
767 .type.bp.breakType = BREAKPOINT_SOFTWARE,
768 .pointId = -1
769 };
770 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_BREAKPOINT, &info);
771 }
772 break;
773#endif
774 case CPU_COMPONENT_CHEAT_DEVICE:
775 if (gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
776 struct mCheatDevice* device = (struct mCheatDevice*) gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
777 struct GBACheatHook* hook = 0;
778 size_t i;
779 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
780 struct GBACheatSet* cheats = (struct GBACheatSet*) *mCheatSetsGetPointer(&device->cheats, i);
781 if (cheats->hook && cheats->hook->address == _ARMPCAddress(cpu)) {
782 mCheatRefresh(device, &cheats->d);
783 hook = cheats->hook;
784 }
785 }
786 if (hook) {
787 ARMRunFake(cpu, hook->patchedOpcode);
788 }
789 }
790 break;
791 default:
792 break;
793 }
794}
795
796void GBAFrameStarted(struct GBA* gba) {
797 GBATestKeypadIRQ(gba);
798
799 if (gba->audio.mixer) {
800 gba->audio.mixer->vblank(gba->audio.mixer);
801 }
802
803 size_t c;
804 for (c = 0; c < mCoreCallbacksListSize(&gba->coreCallbacks); ++c) {
805 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gba->coreCallbacks, c);
806 if (callbacks->videoFrameStarted) {
807 callbacks->videoFrameStarted(callbacks->context);
808 }
809 }
810}
811
812void GBAFrameEnded(struct GBA* gba) {
813 GBASavedataClean(&gba->memory.savedata, gba->video.frameCounter);
814
815 if (gba->rr) {
816 gba->rr->nextFrame(gba->rr);
817 }
818
819 if (gba->cpu->components && gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
820 struct mCheatDevice* device = (struct mCheatDevice*) gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
821 size_t i;
822 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
823 struct GBACheatSet* cheats = (struct GBACheatSet*) *mCheatSetsGetPointer(&device->cheats, i);
824 if (!cheats->hook) {
825 mCheatRefresh(device, &cheats->d);
826 }
827 }
828 }
829
830 if (gba->stream && gba->stream->postVideoFrame) {
831 const color_t* pixels;
832 size_t stride;
833 gba->video.renderer->getPixels(gba->video.renderer, &stride, (const void**) &pixels);
834 gba->stream->postVideoFrame(gba->stream, pixels, stride);
835 }
836
837 if (gba->memory.hw.devices & (HW_GB_PLAYER | HW_GB_PLAYER_DETECTION)) {
838 GBAHardwarePlayerUpdate(gba);
839 }
840
841 size_t c;
842 for (c = 0; c < mCoreCallbacksListSize(&gba->coreCallbacks); ++c) {
843 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gba->coreCallbacks, c);
844 if (callbacks->videoFrameEnded) {
845 callbacks->videoFrameEnded(callbacks->context);
846 }
847 }
848}
849
850void GBATestKeypadIRQ(struct GBA* gba) {
851 uint16_t keycnt = gba->memory.io[REG_KEYCNT >> 1];
852 if (!(keycnt & 0x4000)) {
853 return;
854 }
855 int isAnd = keycnt & 0x8000;
856 if (!gba->keySource) {
857 // TODO?
858 return;
859 }
860
861 keycnt &= 0x3FF;
862 uint16_t keyInput = *gba->keySource & keycnt;
863
864 if (isAnd && keycnt == keyInput) {
865 GBARaiseIRQ(gba, IRQ_KEYPAD, 0);
866 } else if (!isAnd && keyInput) {
867 GBARaiseIRQ(gba, IRQ_KEYPAD, 0);
868 }
869}
870
871static void _triggerIRQ(struct mTiming* timing, void* user, uint32_t cyclesLate) {
872 UNUSED(timing);
873 UNUSED(cyclesLate);
874 struct GBA* gba = user;
875 gba->cpu->halted = 0;
876 if (!(gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1])) {
877 return;
878 }
879
880 if (gba->memory.io[REG_IME >> 1] && !gba->cpu->cpsr.i) {
881 ARMRaiseIRQ(gba->cpu);
882 }
883}
884
885void GBASetBreakpoint(struct GBA* gba, struct mCPUComponent* component, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
886 size_t immediate;
887 for (immediate = 0; immediate < gba->cpu->numComponents; ++immediate) {
888 if (gba->cpu->components[immediate] == component) {
889 break;
890 }
891 }
892 if (immediate == gba->cpu->numComponents) {
893 return;
894 }
895 if (mode == MODE_ARM) {
896 int32_t value;
897 int32_t old;
898 value = 0xE1200070;
899 value |= immediate & 0xF;
900 value |= (immediate & 0xFFF0) << 4;
901 GBAPatch32(gba->cpu, address, value, &old);
902 *opcode = old;
903 } else {
904 int16_t value;
905 int16_t old;
906 value = 0xBE00;
907 value |= immediate & 0xFF;
908 GBAPatch16(gba->cpu, address, value, &old);
909 *opcode = (uint16_t) old;
910 }
911}
912
913void GBAClearBreakpoint(struct GBA* gba, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
914 if (mode == MODE_ARM) {
915 GBAPatch32(gba->cpu, address, opcode, 0);
916 } else {
917 GBAPatch16(gba->cpu, address, opcode, 0);
918 }
919}
920
921#ifdef USE_DEBUGGERS
922static bool _setSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
923 GBASetBreakpoint((struct GBA*) debugger->cpu->master, &debugger->d.p->d, address, mode, opcode);
924 return true;
925}
926
927static bool _clearSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
928 GBAClearBreakpoint((struct GBA*) debugger->cpu->master, address, mode, opcode);
929 return true;
930}
931#endif