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
24mLOG_DEFINE_CATEGORY(GBA, "GBA", "gba");
25mLOG_DEFINE_CATEGORY(GBA_DEBUG, "GBA Debug", "gba.debug");
26
27const uint32_t GBA_COMPONENT_MAGIC = 0x1000000;
28
29static const size_t GBA_ROM_MAGIC_OFFSET = 3;
30static const uint8_t GBA_ROM_MAGIC[] = { 0xEA };
31
32static const size_t GBA_ROM_MAGIC_OFFSET2 = 0xB2;
33static const uint8_t GBA_ROM_MAGIC2[] = { 0x96 };
34
35static const size_t GBA_MB_MAGIC_OFFSET = 0xC0;
36
37static void GBAInit(void* cpu, struct mCPUComponent* component);
38static void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh);
39static void GBAProcessEvents(struct ARMCore* cpu);
40static void GBAHitStub(struct ARMCore* cpu, uint32_t opcode);
41static void GBAIllegal(struct ARMCore* cpu, uint32_t opcode);
42static void GBABreakpoint(struct ARMCore* cpu, int immediate);
43
44static bool _setSoftwareBreakpoint(struct ARMDebugger*, uint32_t address, enum ExecutionMode mode, uint32_t* opcode);
45static bool _clearSoftwareBreakpoint(struct ARMDebugger*, uint32_t address, enum ExecutionMode mode, uint32_t opcode);
46
47
48#ifdef _3DS
49extern uint32_t* romBuffer;
50extern size_t romBufferSize;
51#endif
52
53void GBACreate(struct GBA* gba) {
54 gba->d.id = GBA_COMPONENT_MAGIC;
55 gba->d.init = GBAInit;
56 gba->d.deinit = 0;
57}
58
59static void GBAInit(void* cpu, struct mCPUComponent* component) {
60 struct GBA* gba = (struct GBA*) component;
61 gba->cpu = cpu;
62 gba->debugger = 0;
63 gba->sync = 0;
64
65 GBAInterruptHandlerInit(&gba->cpu->irqh);
66 GBAMemoryInit(gba);
67
68 gba->memory.savedata.timing = &gba->timing;
69 GBASavedataInit(&gba->memory.savedata, NULL);
70
71 gba->video.p = gba;
72 GBAVideoInit(&gba->video);
73
74 gba->audio.p = gba;
75 GBAAudioInit(&gba->audio, GBA_AUDIO_SAMPLES);
76
77 GBAIOInit(gba);
78
79 gba->sio.p = gba;
80 GBASIOInit(&gba->sio);
81
82 GBAHardwareInit(&gba->memory.hw, NULL);
83
84 gba->springIRQ = 0;
85 gba->keySource = 0;
86 gba->rotationSource = 0;
87 gba->luminanceSource = 0;
88 gba->rtcSource = 0;
89 gba->rumble = 0;
90 gba->rr = 0;
91
92 gba->romVf = 0;
93 gba->biosVf = 0;
94
95 gba->stream = NULL;
96 gba->keyCallback = NULL;
97 mCoreCallbacksListInit(&gba->coreCallbacks, 0);
98
99 gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
100
101 gba->idleOptimization = IDLE_LOOP_REMOVE;
102 gba->idleLoop = IDLE_LOOP_NONE;
103
104 gba->realisticTiming = true;
105 gba->hardCrash = true;
106 gba->allowOpposingDirections = true;
107
108 gba->performingDMA = false;
109
110 gba->isPristine = false;
111 gba->pristineRomSize = 0;
112 gba->yankedRomSize = 0;
113
114 mTimingInit(&gba->timing, &gba->cpu->cycles, &gba->cpu->nextEvent);
115}
116
117void GBAUnloadROM(struct GBA* gba) {
118 if (gba->memory.rom && !gba->isPristine) {
119 if (gba->yankedRomSize) {
120 gba->yankedRomSize = 0;
121 }
122 mappedMemoryFree(gba->memory.rom, SIZE_CART0);
123 }
124
125 if (gba->romVf) {
126#ifndef _3DS
127 gba->romVf->unmap(gba->romVf, gba->memory.rom, gba->pristineRomSize);
128#endif
129 gba->romVf->close(gba->romVf);
130 gba->romVf = NULL;
131 }
132 gba->memory.rom = NULL;
133 gba->isPristine = false;
134
135 GBASavedataDeinit(&gba->memory.savedata);
136 if (gba->memory.savedata.realVf) {
137 gba->memory.savedata.realVf->close(gba->memory.savedata.realVf);
138 gba->memory.savedata.realVf = 0;
139 }
140 gba->idleLoop = IDLE_LOOP_NONE;
141}
142
143void GBADestroy(struct GBA* gba) {
144 GBAUnloadROM(gba);
145
146 if (gba->biosVf) {
147 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
148 gba->biosVf->close(gba->biosVf);
149 gba->biosVf = 0;
150 }
151
152 GBAMemoryDeinit(gba);
153 GBAVideoDeinit(&gba->video);
154 GBAAudioDeinit(&gba->audio);
155 GBASIODeinit(&gba->sio);
156 gba->rr = 0;
157 mTimingDeinit(&gba->timing);
158 mCoreCallbacksListDeinit(&gba->coreCallbacks);
159}
160
161void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
162 irqh->reset = GBAReset;
163 irqh->processEvents = GBAProcessEvents;
164 irqh->swi16 = GBASwi16;
165 irqh->swi32 = GBASwi32;
166 irqh->hitIllegal = GBAIllegal;
167 irqh->readCPSR = GBATestIRQ;
168 irqh->hitStub = GBAHitStub;
169 irqh->bkpt16 = GBABreakpoint;
170 irqh->bkpt32 = GBABreakpoint;
171}
172
173void GBAReset(struct ARMCore* cpu) {
174 ARMSetPrivilegeMode(cpu, MODE_IRQ);
175 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
176 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
177 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
178 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
179 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
180
181 struct GBA* gba = (struct GBA*) cpu->master;
182 if (!gba->rr || (!gba->rr->isPlaying(gba->rr) && !gba->rr->isRecording(gba->rr))) {
183 GBASavedataUnmask(&gba->memory.savedata);
184 }
185
186 gba->cpuBlocked = false;
187 gba->earlyExit = false;
188 if (gba->yankedRomSize) {
189 gba->memory.romSize = gba->yankedRomSize;
190 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
191 gba->yankedRomSize = 0;
192 }
193 mTimingClear(&gba->timing);
194 GBAMemoryReset(gba);
195 GBAVideoReset(&gba->video);
196 GBAAudioReset(&gba->audio);
197 GBAIOInit(gba);
198 GBATimerInit(gba);
199
200 GBASIOReset(&gba->sio);
201
202 gba->lastJump = 0;
203 gba->haltPending = false;
204 gba->idleDetectionStep = 0;
205 gba->idleDetectionFailures = 0;
206
207 gba->debug = false;
208 memset(gba->debugString, 0, sizeof(gba->debugString));
209}
210
211void GBASkipBIOS(struct GBA* gba) {
212 struct ARMCore* cpu = gba->cpu;
213 if (cpu->gprs[ARM_PC] == BASE_RESET + WORD_SIZE_ARM) {
214 if (gba->memory.rom) {
215 cpu->gprs[ARM_PC] = BASE_CART0;
216 } else {
217 cpu->gprs[ARM_PC] = BASE_WORKING_RAM;
218 }
219 gba->memory.io[REG_VCOUNT >> 1] = 0x7E;
220 gba->memory.io[REG_POSTFLG >> 1] = 1;
221 int currentCycles = 0;
222 ARM_WRITE_PC;
223 }
224}
225
226static void GBAProcessEvents(struct ARMCore* cpu) {
227 struct GBA* gba = (struct GBA*) cpu->master;
228
229 gba->bus = cpu->prefetch[1];
230 if (cpu->executionMode == MODE_THUMB) {
231 gba->bus |= cpu->prefetch[1] << 16;
232 }
233
234 if (gba->springIRQ && !cpu->cpsr.i) {
235 ARMRaiseIRQ(cpu);
236 gba->springIRQ = 0;
237 }
238
239 int32_t nextEvent = cpu->nextEvent;
240 while (cpu->cycles >= nextEvent) {
241 int32_t cycles = cpu->cycles;
242
243 cpu->cycles = 0;
244 cpu->nextEvent = INT_MAX;
245
246#ifndef NDEBUG
247 if (cycles < 0) {
248 mLOG(GBA, FATAL, "Negative cycles passed: %i", cycles);
249 }
250#endif
251 nextEvent = cycles;
252 do {
253 nextEvent = mTimingTick(&gba->timing, nextEvent);
254 } while (gba->cpuBlocked);
255
256 cpu->nextEvent = nextEvent;
257
258 if (gba->earlyExit) {
259 gba->earlyExit = false;
260 break;
261 }
262 if (cpu->halted) {
263 cpu->cycles = nextEvent;
264 if (!gba->memory.io[REG_IME >> 1] || !gba->memory.io[REG_IE >> 1]) {
265 break;
266 }
267 }
268#ifndef NDEBUG
269 else if (nextEvent < 0) {
270 mLOG(GBA, FATAL, "Negative cycles will pass: %i", nextEvent);
271 }
272#endif
273 }
274}
275
276#ifdef USE_DEBUGGERS
277void GBAAttachDebugger(struct GBA* gba, struct mDebugger* debugger) {
278 gba->debugger = (struct ARMDebugger*) debugger->platform;
279 gba->debugger->setSoftwareBreakpoint = _setSoftwareBreakpoint;
280 gba->debugger->clearSoftwareBreakpoint = _clearSoftwareBreakpoint;
281 gba->cpu->components[CPU_COMPONENT_DEBUGGER] = &debugger->d;
282 ARMHotplugAttach(gba->cpu, CPU_COMPONENT_DEBUGGER);
283}
284
285void GBADetachDebugger(struct GBA* gba) {
286 if (gba->debugger) {
287 ARMHotplugDetach(gba->cpu, CPU_COMPONENT_DEBUGGER);
288 }
289 gba->cpu->components[CPU_COMPONENT_DEBUGGER] = NULL;
290 gba->debugger = NULL;
291}
292#endif
293
294bool GBALoadMB(struct GBA* gba, struct VFile* vf) {
295 GBAUnloadROM(gba);
296 gba->romVf = vf;
297 gba->pristineRomSize = vf->size(vf);
298 vf->seek(vf, 0, SEEK_SET);
299 if (gba->pristineRomSize > SIZE_WORKING_RAM) {
300 gba->pristineRomSize = SIZE_WORKING_RAM;
301 }
302 gba->isPristine = true;
303 gba->memory.wram = anonymousMemoryMap(SIZE_WORKING_RAM);
304 memset(gba->memory.wram, 0, SIZE_WORKING_RAM);
305 vf->read(vf, gba->memory.wram, gba->pristineRomSize);
306 if (!gba->memory.wram) {
307 mLOG(GBA, WARN, "Couldn't map ROM");
308 return false;
309 }
310 gba->yankedRomSize = 0;
311 gba->memory.romSize = 0;
312 gba->memory.romMask = 0;
313 gba->romCrc32 = doCrc32(gba->memory.wram, gba->pristineRomSize);
314 if (gba->cpu && gba->memory.activeRegion == REGION_WORKING_RAM) {
315 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
316 }
317 return true;
318}
319
320bool GBALoadROM(struct GBA* gba, struct VFile* vf) {
321 if (!vf) {
322 return false;
323 }
324 GBAUnloadROM(gba);
325 gba->romVf = vf;
326 gba->pristineRomSize = vf->size(vf);
327 vf->seek(vf, 0, SEEK_SET);
328 if (gba->pristineRomSize > SIZE_CART0) {
329 gba->pristineRomSize = SIZE_CART0;
330 }
331 gba->isPristine = true;
332#ifdef _3DS
333 if (gba->pristineRomSize <= romBufferSize) {
334 gba->memory.rom = romBuffer;
335 vf->read(vf, romBuffer, gba->pristineRomSize);
336 }
337#else
338 gba->memory.rom = vf->map(vf, gba->pristineRomSize, MAP_READ);
339#endif
340 if (!gba->memory.rom) {
341 mLOG(GBA, WARN, "Couldn't map ROM");
342 return false;
343 }
344 gba->yankedRomSize = 0;
345 gba->memory.romSize = gba->pristineRomSize;
346 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
347 gba->memory.mirroring = false;
348 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
349 GBAHardwareInit(&gba->memory.hw, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
350 GBAVFameDetect(&gba->memory.vfame, gba->memory.rom, gba->memory.romSize);
351 if (gba->cpu && gba->memory.activeRegion >= REGION_CART0) {
352 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
353 }
354 // TODO: error check
355 return true;
356}
357
358bool GBALoadSave(struct GBA* gba, struct VFile* sav) {
359 GBASavedataInit(&gba->memory.savedata, sav);
360 return true;
361}
362
363void GBAYankROM(struct GBA* gba) {
364 gba->yankedRomSize = gba->memory.romSize;
365 gba->memory.romSize = 0;
366 gba->memory.romMask = 0;
367 GBARaiseIRQ(gba, IRQ_GAMEPAK);
368}
369
370void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
371 gba->biosVf = vf;
372 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
373 if (!bios) {
374 mLOG(GBA, WARN, "Couldn't map BIOS");
375 return;
376 }
377 gba->memory.bios = bios;
378 gba->memory.fullBios = 1;
379 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
380 mLOG(GBA, DEBUG, "BIOS Checksum: 0x%X", checksum);
381 if (checksum == GBA_BIOS_CHECKSUM) {
382 mLOG(GBA, INFO, "Official GBA BIOS detected");
383 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
384 mLOG(GBA, INFO, "Official GBA (DS) BIOS detected");
385 } else {
386 mLOG(GBA, WARN, "BIOS checksum incorrect");
387 }
388 gba->biosChecksum = checksum;
389 if (gba->memory.activeRegion == REGION_BIOS) {
390 gba->cpu->memory.activeRegion = gba->memory.bios;
391 }
392 // TODO: error check
393}
394
395void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
396 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
397 if (!patchedSize || patchedSize > SIZE_CART0) {
398 return;
399 }
400 void* newRom = anonymousMemoryMap(SIZE_CART0);
401 if (!patch->applyPatch(patch, gba->memory.rom, gba->pristineRomSize, newRom, patchedSize)) {
402 mappedMemoryFree(newRom, SIZE_CART0);
403 return;
404 }
405 if (gba->romVf) {
406#ifndef _3DS
407 gba->romVf->unmap(gba->romVf, gba->memory.rom, gba->pristineRomSize);
408#endif
409 gba->romVf->close(gba->romVf);
410 gba->romVf = NULL;
411 }
412 gba->isPristine = false;
413 gba->memory.rom = newRom;
414 gba->memory.hw.gpioBase = &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1];
415 gba->memory.romSize = patchedSize;
416 gba->memory.romMask = SIZE_CART0 - 1;
417 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
418}
419
420void GBAWriteIE(struct GBA* gba, uint16_t value) {
421 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
422 ARMRaiseIRQ(gba->cpu);
423 }
424}
425
426void GBAWriteIME(struct GBA* gba, uint16_t value) {
427 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
428 ARMRaiseIRQ(gba->cpu);
429 }
430}
431
432void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
433 gba->memory.io[REG_IF >> 1] |= 1 << irq;
434
435 if (gba->memory.io[REG_IE >> 1] & 1 << irq) {
436 gba->cpu->halted = 0;
437 if (gba->memory.io[REG_IME >> 1]) {
438 ARMRaiseIRQ(gba->cpu);
439 }
440 }
441}
442
443void GBATestIRQ(struct ARMCore* cpu) {
444 struct GBA* gba = (struct GBA*) cpu->master;
445 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
446 gba->springIRQ = gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1];
447 gba->cpu->nextEvent = gba->cpu->cycles;
448 }
449}
450
451void GBAHalt(struct GBA* gba) {
452 gba->cpu->nextEvent = gba->cpu->cycles;
453 gba->cpu->halted = 1;
454}
455
456void GBAStop(struct GBA* gba) {
457 size_t c;
458 for (c = 0; c < mCoreCallbacksListSize(&gba->coreCallbacks); ++c) {
459 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gba->coreCallbacks, c);
460 if (callbacks->sleep) {
461 callbacks->sleep(callbacks->context);
462 }
463 }
464 gba->cpu->nextEvent = gba->cpu->cycles;
465}
466
467void GBADebug(struct GBA* gba, uint16_t flags) {
468 gba->debugFlags = flags;
469 if (GBADebugFlagsIsSend(gba->debugFlags)) {
470 int level = 1 << GBADebugFlagsGetLevel(gba->debugFlags);
471 level &= 0x1F;
472 char oolBuf[0x101];
473 strncpy(oolBuf, gba->debugString, sizeof(gba->debugString));
474 oolBuf[0x100] = '\0';
475 mLog(_mLOG_CAT_GBA_DEBUG(), level, "%s", oolBuf);
476 }
477 gba->debugFlags = GBADebugFlagsClearSend(gba->debugFlags);
478}
479
480bool GBAIsROM(struct VFile* vf) {
481 if (!vf) {
482 return false;
483 }
484
485 uint8_t signature[sizeof(GBA_ROM_MAGIC) + sizeof(GBA_ROM_MAGIC2)];
486 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
487 return false;
488 }
489 if (vf->read(vf, &signature, sizeof(GBA_ROM_MAGIC)) != sizeof(GBA_ROM_MAGIC)) {
490 return false;
491 }
492 if (memcmp(signature, GBA_ROM_MAGIC, sizeof(GBA_ROM_MAGIC)) != 0) {
493 return false;
494 }
495
496 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET2, SEEK_SET) < 0) {
497 return false;
498 }
499 if (vf->read(vf, &signature, sizeof(GBA_ROM_MAGIC2)) != sizeof(GBA_ROM_MAGIC2)) {
500 return false;
501 }
502 if (memcmp(signature, GBA_ROM_MAGIC2, sizeof(GBA_ROM_MAGIC2)) != 0) {
503 // If the signature byte is missing then we must be using an unfixed ROM
504 uint32_t buffer[0x9C / sizeof(uint32_t)];
505 if (vf->seek(vf, 0x4, SEEK_SET) < 0) {
506 return false;
507 }
508 if (vf->read(vf, &buffer, sizeof(buffer)) != sizeof(buffer)) {
509 return false;
510 }
511 uint32_t bits = 0;
512 size_t i;
513 for (i = 0; i < sizeof(buffer) / sizeof(*buffer); ++i) {
514 bits |= buffer[i];
515 }
516 if (bits) {
517 return false;
518 }
519 }
520
521
522 if (GBAIsBIOS(vf)) {
523 return false;
524 }
525 return true;
526}
527
528bool GBAIsMB(struct VFile* vf) {
529 if (!GBAIsROM(vf)) {
530 return false;
531 }
532 if (vf->size(vf) > SIZE_WORKING_RAM) {
533 return false;
534 }
535 if (vf->seek(vf, GBA_MB_MAGIC_OFFSET, SEEK_SET) < 0) {
536 return false;
537 }
538 uint32_t signature;
539 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
540 return false;
541 }
542 uint32_t opcode;
543 LOAD_32(opcode, 0, &signature);
544 struct ARMInstructionInfo info;
545 ARMDecodeARM(opcode, &info);
546 if (info.branchType == ARM_BRANCH) {
547 if (info.op1.immediate <= 0) {
548 return false;
549 } else if (info.op1.immediate == 28) {
550 // Ancient toolchain that is known to throw MB detection for a loop
551 return false;
552 } else if (info.op1.immediate != 24) {
553 return true;
554 }
555 }
556
557 uint32_t pc = GBA_MB_MAGIC_OFFSET;
558 int i;
559 for (i = 0; i < 80; ++i) {
560 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
561 break;
562 }
563 pc += 4;
564 LOAD_32(opcode, 0, &signature);
565 ARMDecodeARM(opcode, &info);
566 if (info.mnemonic != ARM_MN_LDR) {
567 continue;
568 }
569 if ((info.operandFormat & ARM_OPERAND_MEMORY) && info.memory.baseReg == ARM_PC && info.memory.format & ARM_MEMORY_IMMEDIATE_OFFSET) {
570 uint32_t immediate = info.memory.offset.immediate;
571 if (info.memory.format & ARM_MEMORY_OFFSET_SUBTRACT) {
572 immediate = -immediate;
573 }
574 immediate += pc + 8;
575 if (vf->seek(vf, immediate, SEEK_SET) < 0) {
576 break;
577 }
578 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
579 break;
580 }
581 LOAD_32(immediate, 0, &signature);
582 if (vf->seek(vf, pc, SEEK_SET) < 0) {
583 break;
584 }
585 if ((immediate & ~0x7FF) == BASE_WORKING_RAM) {
586 return true;
587 }
588 }
589 }
590 // Found a libgba-linked cart...these are a bit harder to detect.
591 return false;
592}
593
594bool GBAIsBIOS(struct VFile* vf) {
595 if (vf->seek(vf, 0, SEEK_SET) < 0) {
596 return false;
597 }
598 uint8_t interruptTable[7 * 4];
599 if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
600 return false;
601 }
602 int i;
603 for (i = 0; i < 7; ++i) {
604 if (interruptTable[4 * i + 3] != 0xEA || interruptTable[4 * i + 2]) {
605 return false;
606 }
607 }
608 return true;
609}
610
611void GBAGetGameCode(const struct GBA* gba, char* out) {
612 memset(out, 0, 8);
613 if (!gba->memory.rom) {
614 return;
615 }
616
617 memcpy(out, "AGB-", 4);
618 memcpy(&out[4], &((struct GBACartridge*) gba->memory.rom)->id, 4);
619}
620
621void GBAGetGameTitle(const struct GBA* gba, char* out) {
622 if (gba->memory.rom) {
623 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
624 return;
625 }
626 if (gba->isPristine && gba->memory.wram) {
627 memcpy(out, &((struct GBACartridge*) gba->memory.wram)->title, 12);
628 return;
629 }
630 strncpy(out, "(BIOS)", 12);
631}
632
633void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
634 struct GBA* gba = (struct GBA*) cpu->master;
635#ifdef USE_DEBUGGERS
636 if (gba->debugger) {
637 struct mDebuggerEntryInfo info = {
638 .address = _ARMPCAddress(cpu),
639 .type.bp.opcode = opcode
640 };
641 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_ILLEGAL_OP, &info);
642 }
643#endif
644 // TODO: More sensible category?
645 mLOG(GBA, ERROR, "Stub opcode: %08x", opcode);
646}
647
648void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
649 struct GBA* gba = (struct GBA*) cpu->master;
650 if (!gba->yankedRomSize) {
651 // TODO: More sensible category?
652 mLOG(GBA, WARN, "Illegal opcode: %08x", opcode);
653 }
654 if (cpu->executionMode == MODE_THUMB && (opcode & 0xFFC0) == 0xE800) {
655 mLOG(GBA, DEBUG, "Hit Wii U VC opcode: %08x", opcode);
656 return;
657 }
658#ifdef USE_DEBUGGERS
659 if (gba->debugger) {
660 struct mDebuggerEntryInfo info = {
661 .address = _ARMPCAddress(cpu),
662 .type.bp.opcode = opcode
663 };
664 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_ILLEGAL_OP, &info);
665 } else
666#endif
667 {
668 ARMRaiseUndefined(cpu);
669 }
670}
671
672void GBABreakpoint(struct ARMCore* cpu, int immediate) {
673 struct GBA* gba = (struct GBA*) cpu->master;
674 if (immediate >= CPU_COMPONENT_MAX) {
675 return;
676 }
677 switch (immediate) {
678#ifdef USE_DEBUGGERS
679 case CPU_COMPONENT_DEBUGGER:
680 if (gba->debugger) {
681 struct mDebuggerEntryInfo info = {
682 .address = _ARMPCAddress(cpu),
683 .type.bp.breakType = BREAKPOINT_SOFTWARE
684 };
685 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_BREAKPOINT, &info);
686 }
687 break;
688#endif
689 case CPU_COMPONENT_CHEAT_DEVICE:
690 if (gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
691 struct mCheatDevice* device = (struct mCheatDevice*) gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
692 struct GBACheatHook* hook = 0;
693 size_t i;
694 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
695 struct GBACheatSet* cheats = (struct GBACheatSet*) *mCheatSetsGetPointer(&device->cheats, i);
696 if (cheats->hook && cheats->hook->address == _ARMPCAddress(cpu)) {
697 mCheatRefresh(device, &cheats->d);
698 hook = cheats->hook;
699 }
700 }
701 if (hook) {
702 ARMRunFake(cpu, hook->patchedOpcode);
703 }
704 }
705 break;
706 default:
707 break;
708 }
709}
710
711void GBAFrameStarted(struct GBA* gba) {
712 GBATestKeypadIRQ(gba);
713
714 size_t c;
715 for (c = 0; c < mCoreCallbacksListSize(&gba->coreCallbacks); ++c) {
716 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gba->coreCallbacks, c);
717 if (callbacks->videoFrameStarted) {
718 callbacks->videoFrameStarted(callbacks->context);
719 }
720 }
721}
722
723void GBAFrameEnded(struct GBA* gba) {
724 GBASavedataClean(&gba->memory.savedata, gba->video.frameCounter);
725
726 if (gba->rr) {
727 gba->rr->nextFrame(gba->rr);
728 }
729
730 if (gba->cpu->components && gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
731 struct mCheatDevice* device = (struct mCheatDevice*) gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
732 size_t i;
733 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
734 struct GBACheatSet* cheats = (struct GBACheatSet*) *mCheatSetsGetPointer(&device->cheats, i);
735 mCheatRefresh(device, &cheats->d);
736 }
737 }
738
739 if (gba->stream && gba->stream->postVideoFrame) {
740 const color_t* pixels;
741 size_t stride;
742 gba->video.renderer->getPixels(gba->video.renderer, &stride, (const void**) &pixels);
743 gba->stream->postVideoFrame(gba->stream, pixels, stride);
744 }
745
746 if (gba->memory.hw.devices & (HW_GB_PLAYER | HW_GB_PLAYER_DETECTION)) {
747 GBAHardwarePlayerUpdate(gba);
748 }
749
750 size_t c;
751 for (c = 0; c < mCoreCallbacksListSize(&gba->coreCallbacks); ++c) {
752 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gba->coreCallbacks, c);
753 if (callbacks->videoFrameEnded) {
754 callbacks->videoFrameEnded(callbacks->context);
755 }
756 }
757}
758
759void GBATestKeypadIRQ(struct GBA* gba) {
760 uint16_t keycnt = gba->memory.io[REG_KEYCNT >> 1];
761 if (!(keycnt & 0x4000)) {
762 return;
763 }
764 int isAnd = keycnt & 0x8000;
765 if (!gba->keySource) {
766 // TODO?
767 return;
768 }
769
770 keycnt &= 0x3FF;
771 uint16_t keyInput = *gba->keySource & keycnt;
772
773 if (isAnd && keycnt == keyInput) {
774 GBARaiseIRQ(gba, IRQ_KEYPAD);
775 } else if (!isAnd && keyInput) {
776 GBARaiseIRQ(gba, IRQ_KEYPAD);
777 }
778}
779
780void GBASetBreakpoint(struct GBA* gba, struct mCPUComponent* component, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
781 size_t immediate;
782 for (immediate = 0; immediate < gba->cpu->numComponents; ++immediate) {
783 if (gba->cpu->components[immediate] == component) {
784 break;
785 }
786 }
787 if (immediate == gba->cpu->numComponents) {
788 return;
789 }
790 if (mode == MODE_ARM) {
791 int32_t value;
792 int32_t old;
793 value = 0xE1200070;
794 value |= immediate & 0xF;
795 value |= (immediate & 0xFFF0) << 4;
796 GBAPatch32(gba->cpu, address, value, &old);
797 *opcode = old;
798 } else {
799 int16_t value;
800 int16_t old;
801 value = 0xBE00;
802 value |= immediate & 0xFF;
803 GBAPatch16(gba->cpu, address, value, &old);
804 *opcode = (uint16_t) old;
805 }
806}
807
808void GBAClearBreakpoint(struct GBA* gba, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
809 if (mode == MODE_ARM) {
810 GBAPatch32(gba->cpu, address, opcode, 0);
811 } else {
812 GBAPatch16(gba->cpu, address, opcode, 0);
813 }
814}
815
816static bool _setSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
817 GBASetBreakpoint((struct GBA*) debugger->cpu->master, &debugger->d.p->d, address, mode, opcode);
818 return true;
819}
820
821static bool _clearSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
822 GBAClearBreakpoint((struct GBA*) debugger->cpu->master, address, mode, opcode);
823 return true;
824}