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
28mLOG_DEFINE_CATEGORY(GBA, "GBA", "gba");
29mLOG_DEFINE_CATEGORY(GBA_DEBUG, "GBA Debug", "gba.debug");
30
31const uint32_t GBA_COMPONENT_MAGIC = 0x1000000;
32
33static const size_t GBA_ROM_MAGIC_OFFSET = 3;
34static const uint8_t GBA_ROM_MAGIC[] = { 0xEA };
35
36static const size_t GBA_ROM_MAGIC_OFFSET2 = 0xB2;
37static const uint8_t GBA_ROM_MAGIC2[] = { 0x96 };
38
39static const size_t GBA_MB_MAGIC_OFFSET = 0xC0;
40
41static void GBAInit(void* cpu, struct mCPUComponent* component);
42static void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh);
43static void GBAProcessEvents(struct ARMCore* cpu);
44static void GBAHitStub(struct ARMCore* cpu, uint32_t opcode);
45static void GBAIllegal(struct ARMCore* cpu, uint32_t opcode);
46static void GBABreakpoint(struct ARMCore* cpu, int immediate);
47
48#ifdef USE_DEBUGGERS
49static bool _setSoftwareBreakpoint(struct ARMDebugger*, uint32_t address, enum ExecutionMode mode, uint32_t* opcode);
50static bool _clearSoftwareBreakpoint(struct ARMDebugger*, uint32_t address, enum ExecutionMode mode, uint32_t opcode);
51#endif
52
53#ifdef FIXED_ROM_BUFFER
54extern uint32_t* romBuffer;
55extern size_t romBufferSize;
56#endif
57
58void GBACreate(struct GBA* gba) {
59 gba->d.id = GBA_COMPONENT_MAGIC;
60 gba->d.init = GBAInit;
61 gba->d.deinit = 0;
62}
63
64static void GBAInit(void* cpu, struct mCPUComponent* component) {
65 struct GBA* gba = (struct GBA*) component;
66 gba->cpu = cpu;
67 gba->debugger = 0;
68 gba->sync = 0;
69
70 GBAInterruptHandlerInit(&gba->cpu->irqh);
71 GBAMemoryInit(gba);
72
73 gba->memory.savedata.timing = &gba->timing;
74 GBASavedataInit(&gba->memory.savedata, NULL);
75
76 gba->video.p = gba;
77 GBAVideoInit(&gba->video);
78
79 gba->audio.p = gba;
80 GBAAudioInit(&gba->audio, GBA_AUDIO_SAMPLES);
81
82 GBAIOInit(gba);
83
84 gba->sio.p = gba;
85 GBASIOInit(&gba->sio);
86
87 GBAHardwareInit(&gba->memory.hw, NULL);
88
89 gba->springIRQ = 0;
90 gba->keySource = 0;
91 gba->rotationSource = 0;
92 gba->luminanceSource = 0;
93 gba->rtcSource = 0;
94 gba->rumble = 0;
95 gba->rr = 0;
96
97 gba->romVf = 0;
98 gba->biosVf = 0;
99
100 gba->stream = NULL;
101 gba->keyCallback = NULL;
102 mCoreCallbacksListInit(&gba->coreCallbacks, 0);
103
104 gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
105
106 gba->idleOptimization = IDLE_LOOP_REMOVE;
107 gba->idleLoop = IDLE_LOOP_NONE;
108
109 gba->hardCrash = true;
110 gba->allowOpposingDirections = true;
111
112 gba->performingDMA = false;
113
114 gba->isPristine = false;
115 gba->pristineRomSize = 0;
116 gba->yankedRomSize = 0;
117
118 mTimingInit(&gba->timing, &gba->cpu->cycles, &gba->cpu->nextEvent);
119}
120
121void GBAUnloadROM(struct GBA* gba) {
122 if (gba->memory.rom && !gba->isPristine) {
123 if (gba->yankedRomSize) {
124 gba->yankedRomSize = 0;
125 }
126 mappedMemoryFree(gba->memory.rom, SIZE_CART0);
127 }
128
129 if (gba->romVf) {
130#ifndef FIXED_ROM_BUFFER
131 if (gba->isPristine) {
132 gba->romVf->unmap(gba->romVf, gba->memory.rom, gba->pristineRomSize);
133 }
134#endif
135 gba->romVf->close(gba->romVf);
136 gba->romVf = NULL;
137 }
138 gba->memory.rom = NULL;
139 gba->isPristine = false;
140
141 gba->memory.savedata.maskWriteback = false;
142 GBASavedataUnmask(&gba->memory.savedata);
143 GBASavedataDeinit(&gba->memory.savedata);
144 if (gba->memory.savedata.realVf) {
145 gba->memory.savedata.realVf->close(gba->memory.savedata.realVf);
146 gba->memory.savedata.realVf = 0;
147 }
148 gba->idleLoop = IDLE_LOOP_NONE;
149}
150
151void GBADestroy(struct GBA* gba) {
152 GBAUnloadROM(gba);
153
154 if (gba->biosVf) {
155 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
156 gba->biosVf->close(gba->biosVf);
157 gba->biosVf = 0;
158 }
159
160 GBAMemoryDeinit(gba);
161 GBAVideoDeinit(&gba->video);
162 GBAAudioDeinit(&gba->audio);
163 GBASIODeinit(&gba->sio);
164 gba->rr = 0;
165 mTimingDeinit(&gba->timing);
166 mCoreCallbacksListDeinit(&gba->coreCallbacks);
167}
168
169void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
170 irqh->reset = GBAReset;
171 irqh->processEvents = GBAProcessEvents;
172 irqh->swi16 = GBASwi16;
173 irqh->swi32 = GBASwi32;
174 irqh->hitIllegal = GBAIllegal;
175 irqh->readCPSR = GBATestIRQ;
176 irqh->hitStub = GBAHitStub;
177 irqh->bkpt16 = GBABreakpoint;
178 irqh->bkpt32 = GBABreakpoint;
179}
180
181void GBAReset(struct ARMCore* cpu) {
182 ARMSetPrivilegeMode(cpu, MODE_IRQ);
183 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
184 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
185 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
186 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
187 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
188
189 struct GBA* gba = (struct GBA*) cpu->master;
190 if (!gba->rr || (!gba->rr->isPlaying(gba->rr) && !gba->rr->isRecording(gba->rr))) {
191 gba->memory.savedata.maskWriteback = false;
192 GBASavedataUnmask(&gba->memory.savedata);
193 }
194
195 gba->cpuBlocked = false;
196 gba->earlyExit = false;
197 if (gba->yankedRomSize) {
198 gba->memory.romSize = gba->yankedRomSize;
199 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
200 gba->yankedRomSize = 0;
201 }
202 mTimingClear(&gba->timing);
203 GBAMemoryReset(gba);
204 GBAVideoReset(&gba->video);
205 GBAAudioReset(&gba->audio);
206 GBAIOInit(gba);
207 GBATimerInit(gba);
208
209 GBASIOReset(&gba->sio);
210
211 gba->lastJump = 0;
212 gba->haltPending = false;
213 gba->idleDetectionStep = 0;
214 gba->idleDetectionFailures = 0;
215
216 gba->debug = false;
217 memset(gba->debugString, 0, sizeof(gba->debugString));
218 if (gba->pristineRomSize > SIZE_CART0) {
219 GBAMatrixReset(gba);
220 }
221
222 if (!gba->romVf && gba->memory.rom) {
223 GBASkipBIOS(gba);
224 }
225}
226
227void GBASkipBIOS(struct GBA* gba) {
228 struct ARMCore* cpu = gba->cpu;
229 if (cpu->gprs[ARM_PC] == BASE_RESET + WORD_SIZE_ARM) {
230 if (gba->memory.rom) {
231 cpu->gprs[ARM_PC] = BASE_CART0;
232 } else {
233 cpu->gprs[ARM_PC] = BASE_WORKING_RAM;
234 }
235 gba->memory.io[REG_VCOUNT >> 1] = 0x7E;
236 gba->memory.io[REG_POSTFLG >> 1] = 1;
237 int currentCycles = 0;
238 ARM_WRITE_PC;
239 }
240}
241
242static void GBAProcessEvents(struct ARMCore* cpu) {
243 struct GBA* gba = (struct GBA*) cpu->master;
244
245 gba->bus = cpu->prefetch[1];
246 if (cpu->executionMode == MODE_THUMB) {
247 gba->bus |= cpu->prefetch[1] << 16;
248 }
249
250 if (gba->springIRQ && !cpu->cpsr.i) {
251 ARMRaiseIRQ(cpu);
252 gba->springIRQ = 0;
253 }
254
255 int32_t nextEvent = cpu->nextEvent;
256 while (cpu->cycles >= nextEvent) {
257 cpu->nextEvent = INT_MAX;
258 nextEvent = 0;
259 do {
260 int32_t cycles = cpu->cycles;
261 cpu->cycles = 0;
262#ifndef NDEBUG
263 if (cycles < 0) {
264 mLOG(GBA, FATAL, "Negative cycles passed: %i", cycles);
265 }
266#endif
267 nextEvent = mTimingTick(&gba->timing, nextEvent + cycles);
268 } while (gba->cpuBlocked);
269
270 cpu->nextEvent = nextEvent;
271 if (cpu->halted) {
272 cpu->cycles = nextEvent;
273 if (!gba->memory.io[REG_IME >> 1] || !gba->memory.io[REG_IE >> 1]) {
274 break;
275 }
276 }
277#ifndef NDEBUG
278 else if (nextEvent < 0) {
279 mLOG(GBA, FATAL, "Negative cycles will pass: %i", nextEvent);
280 }
281#endif
282 if (gba->earlyExit) {
283 break;
284 }
285 }
286 gba->earlyExit = false;
287#ifndef NDEBUG
288 if (gba->cpuBlocked) {
289 mLOG(GBA, FATAL, "CPU is blocked!");
290 }
291#endif
292}
293
294#ifdef USE_DEBUGGERS
295void GBAAttachDebugger(struct GBA* gba, struct mDebugger* debugger) {
296 gba->debugger = (struct ARMDebugger*) debugger->platform;
297 gba->debugger->setSoftwareBreakpoint = _setSoftwareBreakpoint;
298 gba->debugger->clearSoftwareBreakpoint = _clearSoftwareBreakpoint;
299 gba->cpu->components[CPU_COMPONENT_DEBUGGER] = &debugger->d;
300 ARMHotplugAttach(gba->cpu, CPU_COMPONENT_DEBUGGER);
301}
302
303void GBADetachDebugger(struct GBA* gba) {
304 if (gba->debugger) {
305 ARMHotplugDetach(gba->cpu, CPU_COMPONENT_DEBUGGER);
306 }
307 gba->cpu->components[CPU_COMPONENT_DEBUGGER] = NULL;
308 gba->debugger = NULL;
309}
310#endif
311
312bool GBALoadNull(struct GBA* gba) {
313 GBAUnloadROM(gba);
314 gba->romVf = NULL;
315 gba->pristineRomSize = 0;
316#ifndef FIXED_ROM_BUFFER
317 gba->memory.rom = anonymousMemoryMap(SIZE_CART0);
318#else
319 gba->memory.rom = romBuffer;
320#endif
321 gba->isPristine = false;
322 gba->yankedRomSize = 0;
323 gba->memory.romSize = SIZE_CART0;
324 gba->memory.romMask = SIZE_CART0 - 1;
325 gba->memory.mirroring = false;
326 gba->romCrc32 = 0;
327
328 if (gba->cpu) {
329 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
330 }
331 return true;
332}
333
334bool GBALoadMB(struct GBA* gba, struct VFile* vf) {
335 GBAUnloadROM(gba);
336 gba->romVf = vf;
337 gba->pristineRomSize = vf->size(vf);
338 vf->seek(vf, 0, SEEK_SET);
339 if (gba->pristineRomSize > SIZE_WORKING_RAM) {
340 gba->pristineRomSize = SIZE_WORKING_RAM;
341 }
342 gba->isPristine = true;
343 memset(gba->memory.wram, 0, SIZE_WORKING_RAM);
344 vf->read(vf, gba->memory.wram, gba->pristineRomSize);
345 if (!gba->memory.wram) {
346 mLOG(GBA, WARN, "Couldn't map ROM");
347 return false;
348 }
349 gba->yankedRomSize = 0;
350 gba->memory.romSize = 0;
351 gba->memory.romMask = 0;
352 gba->romCrc32 = doCrc32(gba->memory.wram, gba->pristineRomSize);
353 if (gba->cpu && gba->memory.activeRegion == REGION_WORKING_RAM) {
354 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
355 }
356 return true;
357}
358
359bool GBALoadROM(struct GBA* gba, struct VFile* vf) {
360 if (!vf) {
361 return false;
362 }
363 GBAUnloadROM(gba);
364 gba->romVf = vf;
365 gba->pristineRomSize = vf->size(vf);
366 vf->seek(vf, 0, SEEK_SET);
367 if (gba->pristineRomSize > SIZE_CART0) {
368 gba->isPristine = false;
369 gba->memory.romSize = 0x01000000;
370#ifdef FIXED_ROM_BUFFER
371 gba->memory.rom = romBuffer;
372#else
373 gba->memory.rom = anonymousMemoryMap(SIZE_CART0);
374#endif
375 } else {
376 gba->isPristine = true;
377#ifdef FIXED_ROM_BUFFER
378 if (gba->pristineRomSize <= romBufferSize) {
379 gba->memory.rom = romBuffer;
380 vf->read(vf, romBuffer, gba->pristineRomSize);
381 }
382#else
383 gba->memory.rom = vf->map(vf, gba->pristineRomSize, MAP_READ);
384#endif
385 gba->memory.romSize = gba->pristineRomSize;
386 }
387 if (!gba->memory.rom) {
388 mLOG(GBA, WARN, "Couldn't map ROM");
389 return false;
390 }
391 gba->yankedRomSize = 0;
392 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
393 gba->memory.mirroring = false;
394 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
395 GBAHardwareInit(&gba->memory.hw, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
396 GBAVFameDetect(&gba->memory.vfame, gba->memory.rom, gba->memory.romSize);
397 if (popcount32(gba->memory.romSize) != 1) {
398 // This ROM is either a bad dump or homebrew. Emulate flash cart behavior.
399#ifndef FIXED_ROM_BUFFER
400 void* newRom = anonymousMemoryMap(SIZE_CART0);
401 memcpy(newRom, gba->memory.rom, gba->pristineRomSize);
402 gba->memory.rom = newRom;
403#endif
404 gba->memory.romSize = SIZE_CART0;
405 gba->memory.romMask = SIZE_CART0 - 1;
406 gba->isPristine = false;
407 }
408 if (gba->cpu && gba->memory.activeRegion >= REGION_CART0) {
409 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
410 }
411 // TODO: error check
412 return true;
413}
414
415bool GBALoadSave(struct GBA* gba, struct VFile* sav) {
416 GBASavedataInit(&gba->memory.savedata, sav);
417 return true;
418}
419
420void GBAYankROM(struct GBA* gba) {
421 gba->yankedRomSize = gba->memory.romSize;
422 gba->memory.romSize = 0;
423 gba->memory.romMask = 0;
424 GBARaiseIRQ(gba, IRQ_GAMEPAK);
425}
426
427void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
428 gba->biosVf = vf;
429 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
430 if (!bios) {
431 mLOG(GBA, WARN, "Couldn't map BIOS");
432 return;
433 }
434 gba->memory.bios = bios;
435 gba->memory.fullBios = 1;
436 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
437 mLOG(GBA, DEBUG, "BIOS Checksum: 0x%X", checksum);
438 if (checksum == GBA_BIOS_CHECKSUM) {
439 mLOG(GBA, INFO, "Official GBA BIOS detected");
440 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
441 mLOG(GBA, INFO, "Official GBA (DS) BIOS detected");
442 } else {
443 mLOG(GBA, WARN, "BIOS checksum incorrect");
444 }
445 gba->biosChecksum = checksum;
446 if (gba->memory.activeRegion == REGION_BIOS) {
447 gba->cpu->memory.activeRegion = gba->memory.bios;
448 }
449 // TODO: error check
450}
451
452void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
453 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
454 if (!patchedSize || patchedSize > SIZE_CART0) {
455 return;
456 }
457 void* newRom = anonymousMemoryMap(SIZE_CART0);
458 if (!patch->applyPatch(patch, gba->memory.rom, gba->pristineRomSize, newRom, patchedSize)) {
459 mappedMemoryFree(newRom, SIZE_CART0);
460 return;
461 }
462 if (gba->romVf) {
463#ifndef FIXED_ROM_BUFFER
464 gba->romVf->unmap(gba->romVf, gba->memory.rom, gba->pristineRomSize);
465#endif
466 gba->romVf->close(gba->romVf);
467 gba->romVf = NULL;
468 }
469 gba->isPristine = false;
470 gba->memory.rom = newRom;
471 gba->memory.hw.gpioBase = &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1];
472 gba->memory.romSize = patchedSize;
473 gba->memory.romMask = SIZE_CART0 - 1;
474 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
475}
476
477void GBAWriteIE(struct GBA* gba, uint16_t value) {
478 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
479 ARMRaiseIRQ(gba->cpu);
480 }
481}
482
483void GBAWriteIME(struct GBA* gba, uint16_t value) {
484 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
485 ARMRaiseIRQ(gba->cpu);
486 }
487}
488
489void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
490 gba->memory.io[REG_IF >> 1] |= 1 << irq;
491
492 if (gba->memory.io[REG_IE >> 1] & 1 << irq) {
493 gba->cpu->halted = 0;
494 if (gba->memory.io[REG_IME >> 1]) {
495 ARMRaiseIRQ(gba->cpu);
496 }
497 }
498}
499
500void GBATestIRQ(struct ARMCore* cpu) {
501 struct GBA* gba = (struct GBA*) cpu->master;
502 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
503 gba->springIRQ = gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1];
504 gba->cpu->nextEvent = gba->cpu->cycles;
505 }
506}
507
508void GBAHalt(struct GBA* gba) {
509 gba->cpu->nextEvent = gba->cpu->cycles;
510 gba->cpu->halted = 1;
511}
512
513void GBAStop(struct GBA* gba) {
514 size_t c;
515 for (c = 0; c < mCoreCallbacksListSize(&gba->coreCallbacks); ++c) {
516 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gba->coreCallbacks, c);
517 if (callbacks->sleep) {
518 callbacks->sleep(callbacks->context);
519 }
520 }
521 gba->cpu->nextEvent = gba->cpu->cycles;
522}
523
524void GBADebug(struct GBA* gba, uint16_t flags) {
525 gba->debugFlags = flags;
526 if (GBADebugFlagsIsSend(gba->debugFlags)) {
527 int level = 1 << GBADebugFlagsGetLevel(gba->debugFlags);
528 level &= 0x1F;
529 char oolBuf[0x101];
530 strncpy(oolBuf, gba->debugString, sizeof(gba->debugString));
531 memset(gba->debugString, 0, sizeof(gba->debugString));
532 oolBuf[0x100] = '\0';
533 mLog(_mLOG_CAT_GBA_DEBUG(), level, "%s", oolBuf);
534 }
535 gba->debugFlags = GBADebugFlagsClearSend(gba->debugFlags);
536}
537
538bool GBAIsROM(struct VFile* vf) {
539#ifdef USE_ELF
540 struct ELF* elf = ELFOpen(vf);
541 if (elf) {
542 uint32_t entry = ELFEntry(elf);
543 bool isGBA = true;
544 isGBA = isGBA && ELFMachine(elf) == EM_ARM;
545 isGBA = isGBA && (entry == BASE_CART0 || entry == BASE_WORKING_RAM);
546 ELFClose(elf);
547 return isGBA;
548 }
549#endif
550 if (!vf) {
551 return false;
552 }
553
554 uint8_t signature[sizeof(GBA_ROM_MAGIC) + sizeof(GBA_ROM_MAGIC2)];
555 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
556 return false;
557 }
558 if (vf->read(vf, &signature, sizeof(GBA_ROM_MAGIC)) != sizeof(GBA_ROM_MAGIC)) {
559 return false;
560 }
561 if (memcmp(signature, GBA_ROM_MAGIC, sizeof(GBA_ROM_MAGIC)) != 0) {
562 return false;
563 }
564
565 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET2, SEEK_SET) < 0) {
566 return false;
567 }
568 if (vf->read(vf, &signature, sizeof(GBA_ROM_MAGIC2)) != sizeof(GBA_ROM_MAGIC2)) {
569 return false;
570 }
571 if (memcmp(signature, GBA_ROM_MAGIC2, sizeof(GBA_ROM_MAGIC2)) != 0) {
572 // If the signature byte is missing then we must be using an unfixed ROM
573 uint32_t buffer[0x9C / sizeof(uint32_t)];
574 if (vf->seek(vf, 0x4, SEEK_SET) < 0) {
575 return false;
576 }
577 if (vf->read(vf, &buffer, sizeof(buffer)) != sizeof(buffer)) {
578 return false;
579 }
580 uint32_t bits = 0;
581 size_t i;
582 for (i = 0; i < sizeof(buffer) / sizeof(*buffer); ++i) {
583 bits |= buffer[i];
584 }
585 if (bits) {
586 return false;
587 }
588 }
589
590
591 if (GBAIsBIOS(vf)) {
592 return false;
593 }
594 return true;
595}
596
597bool GBAIsMB(struct VFile* vf) {
598 if (!GBAIsROM(vf)) {
599 return false;
600 }
601#ifdef USE_ELF
602 struct ELF* elf = ELFOpen(vf);
603 if (elf) {
604 bool isMB = ELFEntry(elf) == BASE_WORKING_RAM;
605 ELFClose(elf);
606 return isMB;
607 }
608#endif
609 if (vf->size(vf) > SIZE_WORKING_RAM) {
610 return false;
611 }
612 if (vf->seek(vf, GBA_MB_MAGIC_OFFSET, SEEK_SET) < 0) {
613 return false;
614 }
615 uint32_t signature;
616 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
617 return false;
618 }
619 uint32_t opcode;
620 LOAD_32(opcode, 0, &signature);
621 struct ARMInstructionInfo info;
622 ARMDecodeARM(opcode, &info);
623 if (info.branchType == ARM_BRANCH) {
624 if (info.op1.immediate <= 0) {
625 return false;
626 } else if (info.op1.immediate == 28) {
627 // Ancient toolchain that is known to throw MB detection for a loop
628 return false;
629 } else if (info.op1.immediate != 24) {
630 return true;
631 }
632 }
633
634 uint32_t pc = GBA_MB_MAGIC_OFFSET;
635 int i;
636 for (i = 0; i < 80; ++i) {
637 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
638 break;
639 }
640 pc += 4;
641 LOAD_32(opcode, 0, &signature);
642 ARMDecodeARM(opcode, &info);
643 if (info.mnemonic != ARM_MN_LDR) {
644 continue;
645 }
646 if ((info.operandFormat & ARM_OPERAND_MEMORY) && info.memory.baseReg == ARM_PC && info.memory.format & ARM_MEMORY_IMMEDIATE_OFFSET) {
647 uint32_t immediate = info.memory.offset.immediate;
648 if (info.memory.format & ARM_MEMORY_OFFSET_SUBTRACT) {
649 immediate = -immediate;
650 }
651 immediate += pc + 8;
652 if (vf->seek(vf, immediate, SEEK_SET) < 0) {
653 break;
654 }
655 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
656 break;
657 }
658 LOAD_32(immediate, 0, &signature);
659 if (vf->seek(vf, pc, SEEK_SET) < 0) {
660 break;
661 }
662 if ((immediate & ~0x7FF) == BASE_WORKING_RAM) {
663 return true;
664 }
665 }
666 }
667 // Found a libgba-linked cart...these are a bit harder to detect.
668 return false;
669}
670
671bool GBAIsBIOS(struct VFile* vf) {
672 if (vf->seek(vf, 0, SEEK_SET) < 0) {
673 return false;
674 }
675 uint8_t interruptTable[7 * 4];
676 if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
677 return false;
678 }
679 int i;
680 for (i = 0; i < 7; ++i) {
681 if (interruptTable[4 * i + 3] != 0xEA || interruptTable[4 * i + 2]) {
682 return false;
683 }
684 }
685 return true;
686}
687
688void GBAGetGameCode(const struct GBA* gba, char* out) {
689 memset(out, 0, 8);
690 if (!gba->memory.rom) {
691 return;
692 }
693
694 memcpy(out, "AGB-", 4);
695 memcpy(&out[4], &((struct GBACartridge*) gba->memory.rom)->id, 4);
696}
697
698void GBAGetGameTitle(const struct GBA* gba, char* out) {
699 if (gba->memory.rom) {
700 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
701 return;
702 }
703 if (gba->isPristine && gba->memory.wram) {
704 memcpy(out, &((struct GBACartridge*) gba->memory.wram)->title, 12);
705 return;
706 }
707 strncpy(out, "(BIOS)", 12);
708}
709
710void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
711 struct GBA* gba = (struct GBA*) cpu->master;
712 UNUSED(gba);
713#ifdef USE_DEBUGGERS
714 if (gba->debugger) {
715 struct mDebuggerEntryInfo info = {
716 .address = _ARMPCAddress(cpu),
717 .type.bp.opcode = opcode
718 };
719 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_ILLEGAL_OP, &info);
720 }
721#endif
722 // TODO: More sensible category?
723 mLOG(GBA, ERROR, "Stub opcode: %08x", opcode);
724}
725
726void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
727 struct GBA* gba = (struct GBA*) cpu->master;
728 if (!gba->yankedRomSize) {
729 // TODO: More sensible category?
730 mLOG(GBA, WARN, "Illegal opcode: %08x", opcode);
731 }
732 if (cpu->executionMode == MODE_THUMB && (opcode & 0xFFC0) == 0xE800) {
733 mLOG(GBA, DEBUG, "Hit Wii U VC opcode: %08x", opcode);
734 return;
735 }
736#ifdef USE_DEBUGGERS
737 if (gba->debugger) {
738 struct mDebuggerEntryInfo info = {
739 .address = _ARMPCAddress(cpu),
740 .type.bp.opcode = opcode
741 };
742 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_ILLEGAL_OP, &info);
743 } else
744#endif
745 {
746 ARMRaiseUndefined(cpu);
747 }
748}
749
750void GBABreakpoint(struct ARMCore* cpu, int immediate) {
751 struct GBA* gba = (struct GBA*) cpu->master;
752 if (immediate >= CPU_COMPONENT_MAX) {
753 return;
754 }
755 switch (immediate) {
756#ifdef USE_DEBUGGERS
757 case CPU_COMPONENT_DEBUGGER:
758 if (gba->debugger) {
759 struct mDebuggerEntryInfo info = {
760 .address = _ARMPCAddress(cpu),
761 .type.bp.breakType = BREAKPOINT_SOFTWARE
762 };
763 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_BREAKPOINT, &info);
764 }
765 break;
766#endif
767 case CPU_COMPONENT_CHEAT_DEVICE:
768 if (gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
769 struct mCheatDevice* device = (struct mCheatDevice*) gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
770 struct GBACheatHook* hook = 0;
771 size_t i;
772 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
773 struct GBACheatSet* cheats = (struct GBACheatSet*) *mCheatSetsGetPointer(&device->cheats, i);
774 if (cheats->hook && cheats->hook->address == _ARMPCAddress(cpu)) {
775 mCheatRefresh(device, &cheats->d);
776 hook = cheats->hook;
777 }
778 }
779 if (hook) {
780 ARMRunFake(cpu, hook->patchedOpcode);
781 }
782 }
783 break;
784 default:
785 break;
786 }
787}
788
789void GBAFrameStarted(struct GBA* gba) {
790 GBATestKeypadIRQ(gba);
791
792 size_t c;
793 for (c = 0; c < mCoreCallbacksListSize(&gba->coreCallbacks); ++c) {
794 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gba->coreCallbacks, c);
795 if (callbacks->videoFrameStarted) {
796 callbacks->videoFrameStarted(callbacks->context);
797 }
798 }
799}
800
801void GBAFrameEnded(struct GBA* gba) {
802 GBASavedataClean(&gba->memory.savedata, gba->video.frameCounter);
803
804 if (gba->rr) {
805 gba->rr->nextFrame(gba->rr);
806 }
807
808 if (gba->cpu->components && gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
809 struct mCheatDevice* device = (struct mCheatDevice*) gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
810 size_t i;
811 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
812 struct GBACheatSet* cheats = (struct GBACheatSet*) *mCheatSetsGetPointer(&device->cheats, i);
813 if (!cheats->hook) {
814 mCheatRefresh(device, &cheats->d);
815 }
816 }
817 }
818
819 if (gba->stream && gba->stream->postVideoFrame) {
820 const color_t* pixels;
821 size_t stride;
822 gba->video.renderer->getPixels(gba->video.renderer, &stride, (const void**) &pixels);
823 gba->stream->postVideoFrame(gba->stream, pixels, stride);
824 }
825
826 if (gba->memory.hw.devices & (HW_GB_PLAYER | HW_GB_PLAYER_DETECTION)) {
827 GBAHardwarePlayerUpdate(gba);
828 }
829
830 size_t c;
831 for (c = 0; c < mCoreCallbacksListSize(&gba->coreCallbacks); ++c) {
832 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gba->coreCallbacks, c);
833 if (callbacks->videoFrameEnded) {
834 callbacks->videoFrameEnded(callbacks->context);
835 }
836 }
837}
838
839void GBATestKeypadIRQ(struct GBA* gba) {
840 uint16_t keycnt = gba->memory.io[REG_KEYCNT >> 1];
841 if (!(keycnt & 0x4000)) {
842 return;
843 }
844 int isAnd = keycnt & 0x8000;
845 if (!gba->keySource) {
846 // TODO?
847 return;
848 }
849
850 keycnt &= 0x3FF;
851 uint16_t keyInput = *gba->keySource & keycnt;
852
853 if (isAnd && keycnt == keyInput) {
854 GBARaiseIRQ(gba, IRQ_KEYPAD);
855 } else if (!isAnd && keyInput) {
856 GBARaiseIRQ(gba, IRQ_KEYPAD);
857 }
858}
859
860void GBASetBreakpoint(struct GBA* gba, struct mCPUComponent* component, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
861 size_t immediate;
862 for (immediate = 0; immediate < gba->cpu->numComponents; ++immediate) {
863 if (gba->cpu->components[immediate] == component) {
864 break;
865 }
866 }
867 if (immediate == gba->cpu->numComponents) {
868 return;
869 }
870 if (mode == MODE_ARM) {
871 int32_t value;
872 int32_t old;
873 value = 0xE1200070;
874 value |= immediate & 0xF;
875 value |= (immediate & 0xFFF0) << 4;
876 GBAPatch32(gba->cpu, address, value, &old);
877 *opcode = old;
878 } else {
879 int16_t value;
880 int16_t old;
881 value = 0xBE00;
882 value |= immediate & 0xFF;
883 GBAPatch16(gba->cpu, address, value, &old);
884 *opcode = (uint16_t) old;
885 }
886}
887
888void GBAClearBreakpoint(struct GBA* gba, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
889 if (mode == MODE_ARM) {
890 GBAPatch32(gba->cpu, address, opcode, 0);
891 } else {
892 GBAPatch16(gba->cpu, address, opcode, 0);
893 }
894}
895
896#ifdef USE_DEBUGGERS
897static bool _setSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
898 GBASetBreakpoint((struct GBA*) debugger->cpu->master, &debugger->d.p->d, address, mode, opcode);
899 return true;
900}
901
902static bool _clearSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
903 GBAClearBreakpoint((struct GBA*) debugger->cpu->master, address, mode, opcode);
904 return true;
905}
906#endif