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_MB_MAGIC_OFFSET = 0xC0;
37
38static void GBAInit(void* cpu, struct mCPUComponent* component);
39static void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh);
40static void GBAProcessEvents(struct ARMCore* cpu);
41static void GBAHitStub(struct ARMCore* cpu, uint32_t opcode);
42static void GBAIllegal(struct ARMCore* cpu, uint32_t opcode);
43static void GBABreakpoint(struct ARMCore* cpu, int immediate);
44
45static bool _setSoftwareBreakpoint(struct ARMDebugger*, uint32_t address, enum ExecutionMode mode, uint32_t* opcode);
46static bool _clearSoftwareBreakpoint(struct ARMDebugger*, uint32_t address, enum ExecutionMode mode, uint32_t opcode);
47
48
49#ifdef FIXED_ROM_BUFFER
50extern uint32_t* romBuffer;
51extern size_t romBufferSize;
52#endif
53
54void GBACreate(struct GBA* gba) {
55 gba->d.id = GBA_COMPONENT_MAGIC;
56 gba->d.init = GBAInit;
57 gba->d.deinit = 0;
58}
59
60static void GBAInit(void* cpu, struct mCPUComponent* component) {
61 struct GBA* gba = (struct GBA*) component;
62 gba->cpu = cpu;
63 gba->debugger = 0;
64 gba->sync = 0;
65
66 GBAInterruptHandlerInit(&gba->cpu->irqh);
67 GBAMemoryInit(gba);
68
69 gba->memory.savedata.timing = &gba->timing;
70 GBASavedataInit(&gba->memory.savedata, NULL);
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 GBAHardwareInit(&gba->memory.hw, NULL);
84
85 gba->springIRQ = 0;
86 gba->keySource = 0;
87 gba->rotationSource = 0;
88 gba->luminanceSource = 0;
89 gba->rtcSource = 0;
90 gba->rumble = 0;
91 gba->rr = 0;
92
93 gba->romVf = 0;
94 gba->biosVf = 0;
95
96 gba->stream = NULL;
97 gba->keyCallback = NULL;
98 mCoreCallbacksListInit(&gba->coreCallbacks, 0);
99
100 gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
101
102 gba->idleOptimization = IDLE_LOOP_REMOVE;
103 gba->idleLoop = IDLE_LOOP_NONE;
104
105 gba->realisticTiming = true;
106 gba->hardCrash = true;
107 gba->allowOpposingDirections = true;
108
109 gba->performingDMA = false;
110
111 gba->isPristine = false;
112 gba->pristineRomSize = 0;
113 gba->yankedRomSize = 0;
114
115 mTimingInit(&gba->timing, &gba->cpu->cycles, &gba->cpu->nextEvent);
116}
117
118void GBAUnloadROM(struct GBA* gba) {
119 if (gba->memory.rom && !gba->isPristine) {
120 if (gba->yankedRomSize) {
121 gba->yankedRomSize = 0;
122 }
123 mappedMemoryFree(gba->memory.rom, SIZE_CART0);
124 }
125
126 if (gba->romVf) {
127#ifndef FIXED_ROM_BUFFER
128 if (gba->isPristine) {
129 gba->romVf->unmap(gba->romVf, gba->memory.rom, gba->pristineRomSize);
130 }
131#endif
132 gba->romVf->close(gba->romVf);
133 gba->romVf = NULL;
134 }
135 gba->memory.rom = NULL;
136 gba->isPristine = false;
137
138 GBASavedataDeinit(&gba->memory.savedata);
139 if (gba->memory.savedata.realVf) {
140 gba->memory.savedata.realVf->close(gba->memory.savedata.realVf);
141 gba->memory.savedata.realVf = 0;
142 }
143 gba->idleLoop = IDLE_LOOP_NONE;
144}
145
146void GBADestroy(struct GBA* gba) {
147 GBAUnloadROM(gba);
148
149 if (gba->biosVf) {
150 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
151 gba->biosVf->close(gba->biosVf);
152 gba->biosVf = 0;
153 }
154
155 GBAMemoryDeinit(gba);
156 GBAVideoDeinit(&gba->video);
157 GBAAudioDeinit(&gba->audio);
158 GBASIODeinit(&gba->sio);
159 gba->rr = 0;
160 mTimingDeinit(&gba->timing);
161 mCoreCallbacksListDeinit(&gba->coreCallbacks);
162}
163
164void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
165 irqh->reset = GBAReset;
166 irqh->processEvents = GBAProcessEvents;
167 irqh->swi16 = GBASwi16;
168 irqh->swi32 = GBASwi32;
169 irqh->hitIllegal = GBAIllegal;
170 irqh->readCPSR = GBATestIRQ;
171 irqh->hitStub = GBAHitStub;
172 irqh->bkpt16 = GBABreakpoint;
173 irqh->bkpt32 = GBABreakpoint;
174}
175
176void GBAReset(struct ARMCore* cpu) {
177 ARMSetPrivilegeMode(cpu, MODE_IRQ);
178 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
179 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
180 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
181 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
182 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
183
184 struct GBA* gba = (struct GBA*) cpu->master;
185 if (!gba->rr || (!gba->rr->isPlaying(gba->rr) && !gba->rr->isRecording(gba->rr))) {
186 GBASavedataUnmask(&gba->memory.savedata);
187 }
188
189 gba->cpuBlocked = false;
190 gba->earlyExit = false;
191 if (gba->yankedRomSize) {
192 gba->memory.romSize = gba->yankedRomSize;
193 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
194 gba->yankedRomSize = 0;
195 }
196 mTimingClear(&gba->timing);
197 GBAMemoryReset(gba);
198 GBAVideoReset(&gba->video);
199 GBAAudioReset(&gba->audio);
200 GBAIOInit(gba);
201 GBATimerInit(gba);
202
203 GBASIOReset(&gba->sio);
204
205 gba->lastJump = 0;
206 gba->haltPending = false;
207 gba->idleDetectionStep = 0;
208 gba->idleDetectionFailures = 0;
209
210 gba->debug = false;
211 memset(gba->debugString, 0, sizeof(gba->debugString));
212 if (gba->pristineRomSize > SIZE_CART0) {
213 GBAMatrixReset(gba);
214 }
215
216 if (!gba->romVf && gba->memory.rom) {
217 GBASkipBIOS(gba);
218 }
219}
220
221void GBASkipBIOS(struct GBA* gba) {
222 struct ARMCore* cpu = gba->cpu;
223 if (cpu->gprs[ARM_PC] == BASE_RESET + WORD_SIZE_ARM) {
224 if (gba->memory.rom) {
225 cpu->gprs[ARM_PC] = BASE_CART0;
226 } else {
227 cpu->gprs[ARM_PC] = BASE_WORKING_RAM;
228 }
229 gba->memory.io[REG_VCOUNT >> 1] = 0x7E;
230 gba->memory.io[REG_POSTFLG >> 1] = 1;
231 int currentCycles = 0;
232 ARM_WRITE_PC;
233 }
234}
235
236static void GBAProcessEvents(struct ARMCore* cpu) {
237 struct GBA* gba = (struct GBA*) cpu->master;
238
239 gba->bus = cpu->prefetch[1];
240 if (cpu->executionMode == MODE_THUMB) {
241 gba->bus |= cpu->prefetch[1] << 16;
242 }
243
244 if (gba->springIRQ && !cpu->cpsr.i) {
245 ARMRaiseIRQ(cpu);
246 gba->springIRQ = 0;
247 }
248
249 int32_t nextEvent = cpu->nextEvent;
250 while (cpu->cycles >= nextEvent) {
251 cpu->nextEvent = INT_MAX;
252 nextEvent = 0;
253 do {
254 int32_t cycles = cpu->cycles;
255 cpu->cycles = 0;
256#ifndef NDEBUG
257 if (cycles < 0) {
258 mLOG(GBA, FATAL, "Negative cycles passed: %i", cycles);
259 }
260#endif
261 nextEvent = mTimingTick(&gba->timing, nextEvent + cycles);
262 } while (gba->cpuBlocked);
263
264 cpu->nextEvent = nextEvent;
265
266 if (gba->earlyExit) {
267 gba->earlyExit = false;
268 break;
269 }
270 if (cpu->halted) {
271 cpu->cycles = nextEvent;
272 if (!gba->memory.io[REG_IME >> 1] || !gba->memory.io[REG_IE >> 1]) {
273 break;
274 }
275 }
276#ifndef NDEBUG
277 else if (nextEvent < 0) {
278 mLOG(GBA, FATAL, "Negative cycles will pass: %i", nextEvent);
279 }
280#endif
281 }
282#ifndef NDEBUG
283 if (gba->cpuBlocked) {
284 mLOG(GBA, FATAL, "CPU is blocked!");
285 }
286#endif
287}
288
289#ifdef USE_DEBUGGERS
290void GBAAttachDebugger(struct GBA* gba, struct mDebugger* debugger) {
291 gba->debugger = (struct ARMDebugger*) debugger->platform;
292 gba->debugger->setSoftwareBreakpoint = _setSoftwareBreakpoint;
293 gba->debugger->clearSoftwareBreakpoint = _clearSoftwareBreakpoint;
294 gba->cpu->components[CPU_COMPONENT_DEBUGGER] = &debugger->d;
295 ARMHotplugAttach(gba->cpu, CPU_COMPONENT_DEBUGGER);
296}
297
298void GBADetachDebugger(struct GBA* gba) {
299 if (gba->debugger) {
300 ARMHotplugDetach(gba->cpu, CPU_COMPONENT_DEBUGGER);
301 }
302 gba->cpu->components[CPU_COMPONENT_DEBUGGER] = NULL;
303 gba->debugger = NULL;
304}
305#endif
306
307bool GBALoadNull(struct GBA* gba) {
308 GBAUnloadROM(gba);
309 gba->romVf = NULL;
310 gba->pristineRomSize = 0;
311#ifndef FIXED_ROM_BUFFER
312 gba->memory.rom = anonymousMemoryMap(SIZE_CART0);
313#else
314 gba->memory.rom = romBuffer;
315#endif
316 gba->isPristine = false;
317 gba->yankedRomSize = 0;
318 gba->memory.romSize = SIZE_CART0;
319 gba->memory.romMask = SIZE_CART0 - 1;
320 gba->memory.mirroring = false;
321 gba->romCrc32 = 0;
322
323 if (gba->cpu) {
324 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
325 }
326 return true;
327}
328
329bool GBALoadMB(struct GBA* gba, struct VFile* vf) {
330 GBAUnloadROM(gba);
331 gba->romVf = vf;
332 gba->pristineRomSize = vf->size(vf);
333 vf->seek(vf, 0, SEEK_SET);
334 if (gba->pristineRomSize > SIZE_WORKING_RAM) {
335 gba->pristineRomSize = SIZE_WORKING_RAM;
336 }
337 gba->isPristine = true;
338 memset(gba->memory.wram, 0, SIZE_WORKING_RAM);
339 vf->read(vf, gba->memory.wram, gba->pristineRomSize);
340 if (!gba->memory.wram) {
341 mLOG(GBA, WARN, "Couldn't map ROM");
342 return false;
343 }
344 gba->yankedRomSize = 0;
345 gba->memory.romSize = 0;
346 gba->memory.romMask = 0;
347 gba->romCrc32 = doCrc32(gba->memory.wram, gba->pristineRomSize);
348 if (gba->cpu && gba->memory.activeRegion == REGION_WORKING_RAM) {
349 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
350 }
351 return true;
352}
353
354bool GBALoadROM(struct GBA* gba, struct VFile* vf) {
355 if (!vf) {
356 return false;
357 }
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_CART0) {
363 gba->isPristine = false;
364 gba->memory.romSize = 0x01000000;
365#ifdef FIXED_ROM_BUFFER
366 gba->memory.rom = romBuffer;
367#else
368 gba->memory.rom = anonymousMemoryMap(SIZE_CART0);
369#endif
370 } else {
371 gba->isPristine = true;
372#ifdef FIXED_ROM_BUFFER
373 if (gba->pristineRomSize <= romBufferSize) {
374 gba->memory.rom = romBuffer;
375 vf->read(vf, romBuffer, gba->pristineRomSize);
376 }
377#else
378 gba->memory.rom = vf->map(vf, gba->pristineRomSize, MAP_READ);
379#endif
380 gba->memory.romSize = gba->pristineRomSize;
381 }
382 if (!gba->memory.rom) {
383 mLOG(GBA, WARN, "Couldn't map ROM");
384 return false;
385 }
386 gba->yankedRomSize = 0;
387 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
388 gba->memory.mirroring = false;
389 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
390 GBAHardwareInit(&gba->memory.hw, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
391 GBAVFameDetect(&gba->memory.vfame, gba->memory.rom, gba->memory.romSize);
392 if (popcount32(gba->memory.romSize) != 1) {
393 // This ROM is either a bad dump or homebrew. Emulate flash cart behavior.
394#ifndef FIXED_ROM_BUFFER
395 void* newRom = anonymousMemoryMap(SIZE_CART0);
396 memcpy(newRom, gba->memory.rom, gba->pristineRomSize);
397 gba->memory.rom = newRom;
398#endif
399 gba->memory.romSize = SIZE_CART0;
400 gba->isPristine = false;
401 }
402 if (gba->cpu && gba->memory.activeRegion >= REGION_CART0) {
403 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
404 }
405 // TODO: error check
406 return true;
407}
408
409bool GBALoadSave(struct GBA* gba, struct VFile* sav) {
410 GBASavedataInit(&gba->memory.savedata, sav);
411 return true;
412}
413
414void GBAYankROM(struct GBA* gba) {
415 gba->yankedRomSize = gba->memory.romSize;
416 gba->memory.romSize = 0;
417 gba->memory.romMask = 0;
418 GBARaiseIRQ(gba, IRQ_GAMEPAK);
419}
420
421void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
422 gba->biosVf = vf;
423 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
424 if (!bios) {
425 mLOG(GBA, WARN, "Couldn't map BIOS");
426 return;
427 }
428 gba->memory.bios = bios;
429 gba->memory.fullBios = 1;
430 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
431 mLOG(GBA, DEBUG, "BIOS Checksum: 0x%X", checksum);
432 if (checksum == GBA_BIOS_CHECKSUM) {
433 mLOG(GBA, INFO, "Official GBA BIOS detected");
434 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
435 mLOG(GBA, INFO, "Official GBA (DS) BIOS detected");
436 } else {
437 mLOG(GBA, WARN, "BIOS checksum incorrect");
438 }
439 gba->biosChecksum = checksum;
440 if (gba->memory.activeRegion == REGION_BIOS) {
441 gba->cpu->memory.activeRegion = gba->memory.bios;
442 }
443 // TODO: error check
444}
445
446void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
447 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
448 if (!patchedSize || patchedSize > SIZE_CART0) {
449 return;
450 }
451 void* newRom = anonymousMemoryMap(SIZE_CART0);
452 if (!patch->applyPatch(patch, gba->memory.rom, gba->pristineRomSize, newRom, patchedSize)) {
453 mappedMemoryFree(newRom, SIZE_CART0);
454 return;
455 }
456 if (gba->romVf) {
457#ifndef FIXED_ROM_BUFFER
458 gba->romVf->unmap(gba->romVf, gba->memory.rom, gba->pristineRomSize);
459#endif
460 gba->romVf->close(gba->romVf);
461 gba->romVf = NULL;
462 }
463 gba->isPristine = false;
464 gba->memory.rom = newRom;
465 gba->memory.hw.gpioBase = &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1];
466 gba->memory.romSize = patchedSize;
467 gba->memory.romMask = SIZE_CART0 - 1;
468 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
469}
470
471void GBAWriteIE(struct GBA* gba, uint16_t value) {
472 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
473 ARMRaiseIRQ(gba->cpu);
474 }
475}
476
477void GBAWriteIME(struct GBA* gba, uint16_t value) {
478 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
479 ARMRaiseIRQ(gba->cpu);
480 }
481}
482
483void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
484 gba->memory.io[REG_IF >> 1] |= 1 << irq;
485
486 if (gba->memory.io[REG_IE >> 1] & 1 << irq) {
487 gba->cpu->halted = 0;
488 if (gba->memory.io[REG_IME >> 1]) {
489 ARMRaiseIRQ(gba->cpu);
490 }
491 }
492}
493
494void GBATestIRQ(struct ARMCore* cpu) {
495 struct GBA* gba = (struct GBA*) cpu->master;
496 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
497 gba->springIRQ = gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1];
498 gba->cpu->nextEvent = gba->cpu->cycles;
499 }
500}
501
502void GBAHalt(struct GBA* gba) {
503 gba->cpu->nextEvent = gba->cpu->cycles;
504 gba->cpu->halted = 1;
505}
506
507void GBAStop(struct GBA* gba) {
508 size_t c;
509 for (c = 0; c < mCoreCallbacksListSize(&gba->coreCallbacks); ++c) {
510 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gba->coreCallbacks, c);
511 if (callbacks->sleep) {
512 callbacks->sleep(callbacks->context);
513 }
514 }
515 gba->cpu->nextEvent = gba->cpu->cycles;
516}
517
518void GBADebug(struct GBA* gba, uint16_t flags) {
519 gba->debugFlags = flags;
520 if (GBADebugFlagsIsSend(gba->debugFlags)) {
521 int level = 1 << GBADebugFlagsGetLevel(gba->debugFlags);
522 level &= 0x1F;
523 char oolBuf[0x101];
524 strncpy(oolBuf, gba->debugString, sizeof(gba->debugString));
525 oolBuf[0x100] = '\0';
526 mLog(_mLOG_CAT_GBA_DEBUG(), level, "%s", oolBuf);
527 }
528 gba->debugFlags = GBADebugFlagsClearSend(gba->debugFlags);
529}
530
531bool GBAIsROM(struct VFile* vf) {
532#ifdef USE_ELF
533 struct ELF* elf = ELFOpen(vf);
534 if (elf) {
535 uint32_t entry = ELFEntry(elf);
536 bool isGBA = true;
537 isGBA = isGBA && ELFMachine(elf) == EM_ARM;
538 isGBA = isGBA && (entry == BASE_CART0 || entry == BASE_WORKING_RAM);
539 ELFClose(elf);
540 return isGBA;
541 }
542#endif
543 if (!vf) {
544 return false;
545 }
546 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
547 return false;
548 }
549 uint8_t signature[sizeof(GBA_ROM_MAGIC)];
550 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
551 return false;
552 }
553 if (GBAIsBIOS(vf)) {
554 return false;
555 }
556 return memcmp(signature, GBA_ROM_MAGIC, sizeof(signature)) == 0;
557}
558
559bool GBAIsMB(struct VFile* vf) {
560 if (!GBAIsROM(vf)) {
561 return false;
562 }
563#ifdef USE_ELF
564 struct ELF* elf = ELFOpen(vf);
565 if (elf) {
566 bool isMB = ELFEntry(elf) == BASE_WORKING_RAM;
567 ELFClose(elf);
568 return isMB;
569 }
570#endif
571 if (vf->size(vf) > SIZE_WORKING_RAM) {
572 return false;
573 }
574 if (vf->seek(vf, GBA_MB_MAGIC_OFFSET, SEEK_SET) < 0) {
575 return false;
576 }
577 uint32_t signature;
578 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
579 return false;
580 }
581 uint32_t opcode;
582 LOAD_32(opcode, 0, &signature);
583 struct ARMInstructionInfo info;
584 ARMDecodeARM(opcode, &info);
585 if (info.branchType == ARM_BRANCH) {
586 if (info.op1.immediate <= 0) {
587 return false;
588 } else if (info.op1.immediate == 28) {
589 // Ancient toolchain that is known to throw MB detection for a loop
590 return false;
591 } else if (info.op1.immediate != 24) {
592 return true;
593 }
594 }
595
596 uint32_t pc = GBA_MB_MAGIC_OFFSET;
597 int i;
598 for (i = 0; i < 80; ++i) {
599 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
600 break;
601 }
602 pc += 4;
603 LOAD_32(opcode, 0, &signature);
604 ARMDecodeARM(opcode, &info);
605 if (info.mnemonic != ARM_MN_LDR) {
606 continue;
607 }
608 if ((info.operandFormat & ARM_OPERAND_MEMORY) && info.memory.baseReg == ARM_PC && info.memory.format & ARM_MEMORY_IMMEDIATE_OFFSET) {
609 uint32_t immediate = info.memory.offset.immediate;
610 if (info.memory.format & ARM_MEMORY_OFFSET_SUBTRACT) {
611 immediate = -immediate;
612 }
613 immediate += pc + 8;
614 if (vf->seek(vf, immediate, SEEK_SET) < 0) {
615 break;
616 }
617 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
618 break;
619 }
620 LOAD_32(immediate, 0, &signature);
621 if (vf->seek(vf, pc, SEEK_SET) < 0) {
622 break;
623 }
624 if ((immediate & ~0x7FF) == BASE_WORKING_RAM) {
625 return true;
626 }
627 }
628 }
629 // Found a libgba-linked cart...these are a bit harder to detect.
630 return false;
631}
632
633bool GBAIsBIOS(struct VFile* vf) {
634 if (vf->seek(vf, 0, SEEK_SET) < 0) {
635 return false;
636 }
637 uint8_t interruptTable[7 * 4];
638 if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
639 return false;
640 }
641 int i;
642 for (i = 0; i < 7; ++i) {
643 if (interruptTable[4 * i + 3] != 0xEA || interruptTable[4 * i + 2]) {
644 return false;
645 }
646 }
647 return true;
648}
649
650void GBAGetGameCode(const struct GBA* gba, char* out) {
651 memset(out, 0, 8);
652 if (!gba->memory.rom) {
653 return;
654 }
655
656 memcpy(out, "AGB-", 4);
657 memcpy(&out[4], &((struct GBACartridge*) gba->memory.rom)->id, 4);
658}
659
660void GBAGetGameTitle(const struct GBA* gba, char* out) {
661 if (gba->memory.rom) {
662 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
663 return;
664 }
665 if (gba->isPristine && gba->memory.wram) {
666 memcpy(out, &((struct GBACartridge*) gba->memory.wram)->title, 12);
667 return;
668 }
669 strncpy(out, "(BIOS)", 12);
670}
671
672void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
673 struct GBA* gba = (struct GBA*) cpu->master;
674#ifdef USE_DEBUGGERS
675 if (gba->debugger) {
676 struct mDebuggerEntryInfo info = {
677 .address = _ARMPCAddress(cpu),
678 .type.bp.opcode = opcode
679 };
680 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_ILLEGAL_OP, &info);
681 }
682#endif
683 // TODO: More sensible category?
684 mLOG(GBA, ERROR, "Stub opcode: %08x", opcode);
685}
686
687void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
688 struct GBA* gba = (struct GBA*) cpu->master;
689 if (!gba->yankedRomSize) {
690 // TODO: More sensible category?
691 mLOG(GBA, WARN, "Illegal opcode: %08x", opcode);
692 }
693 if (cpu->executionMode == MODE_THUMB && (opcode & 0xFFC0) == 0xE800) {
694 mLOG(GBA, DEBUG, "Hit Wii U VC opcode: %08x", opcode);
695 return;
696 }
697#ifdef USE_DEBUGGERS
698 if (gba->debugger) {
699 struct mDebuggerEntryInfo info = {
700 .address = _ARMPCAddress(cpu),
701 .type.bp.opcode = opcode
702 };
703 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_ILLEGAL_OP, &info);
704 } else
705#endif
706 {
707 ARMRaiseUndefined(cpu);
708 }
709}
710
711void GBABreakpoint(struct ARMCore* cpu, int immediate) {
712 struct GBA* gba = (struct GBA*) cpu->master;
713 if (immediate >= CPU_COMPONENT_MAX) {
714 return;
715 }
716 switch (immediate) {
717#ifdef USE_DEBUGGERS
718 case CPU_COMPONENT_DEBUGGER:
719 if (gba->debugger) {
720 struct mDebuggerEntryInfo info = {
721 .address = _ARMPCAddress(cpu),
722 .type.bp.breakType = BREAKPOINT_SOFTWARE
723 };
724 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_BREAKPOINT, &info);
725 }
726 break;
727#endif
728 case CPU_COMPONENT_CHEAT_DEVICE:
729 if (gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
730 struct mCheatDevice* device = (struct mCheatDevice*) gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
731 struct GBACheatHook* hook = 0;
732 size_t i;
733 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
734 struct GBACheatSet* cheats = (struct GBACheatSet*) *mCheatSetsGetPointer(&device->cheats, i);
735 if (cheats->hook && cheats->hook->address == _ARMPCAddress(cpu)) {
736 mCheatRefresh(device, &cheats->d);
737 hook = cheats->hook;
738 }
739 }
740 if (hook) {
741 ARMRunFake(cpu, hook->patchedOpcode);
742 }
743 }
744 break;
745 default:
746 break;
747 }
748}
749
750void GBAFrameStarted(struct GBA* gba) {
751 GBATestKeypadIRQ(gba);
752
753 size_t c;
754 for (c = 0; c < mCoreCallbacksListSize(&gba->coreCallbacks); ++c) {
755 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gba->coreCallbacks, c);
756 if (callbacks->videoFrameStarted) {
757 callbacks->videoFrameStarted(callbacks->context);
758 }
759 }
760}
761
762void GBAFrameEnded(struct GBA* gba) {
763 GBASavedataClean(&gba->memory.savedata, gba->video.frameCounter);
764
765 if (gba->rr) {
766 gba->rr->nextFrame(gba->rr);
767 }
768
769 if (gba->cpu->components && gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
770 struct mCheatDevice* device = (struct mCheatDevice*) gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
771 size_t i;
772 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
773 struct GBACheatSet* cheats = (struct GBACheatSet*) *mCheatSetsGetPointer(&device->cheats, i);
774 mCheatRefresh(device, &cheats->d);
775 }
776 }
777
778 if (gba->stream && gba->stream->postVideoFrame) {
779 const color_t* pixels;
780 size_t stride;
781 gba->video.renderer->getPixels(gba->video.renderer, &stride, (const void**) &pixels);
782 gba->stream->postVideoFrame(gba->stream, pixels, stride);
783 }
784
785 if (gba->memory.hw.devices & (HW_GB_PLAYER | HW_GB_PLAYER_DETECTION)) {
786 GBAHardwarePlayerUpdate(gba);
787 }
788
789 size_t c;
790 for (c = 0; c < mCoreCallbacksListSize(&gba->coreCallbacks); ++c) {
791 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gba->coreCallbacks, c);
792 if (callbacks->videoFrameEnded) {
793 callbacks->videoFrameEnded(callbacks->context);
794 }
795 }
796}
797
798void GBATestKeypadIRQ(struct GBA* gba) {
799 uint16_t keycnt = gba->memory.io[REG_KEYCNT >> 1];
800 if (!(keycnt & 0x4000)) {
801 return;
802 }
803 int isAnd = keycnt & 0x8000;
804 if (!gba->keySource) {
805 // TODO?
806 return;
807 }
808
809 keycnt &= 0x3FF;
810 uint16_t keyInput = *gba->keySource & keycnt;
811
812 if (isAnd && keycnt == keyInput) {
813 GBARaiseIRQ(gba, IRQ_KEYPAD);
814 } else if (!isAnd && keyInput) {
815 GBARaiseIRQ(gba, IRQ_KEYPAD);
816 }
817}
818
819void GBASetBreakpoint(struct GBA* gba, struct mCPUComponent* component, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
820 size_t immediate;
821 for (immediate = 0; immediate < gba->cpu->numComponents; ++immediate) {
822 if (gba->cpu->components[immediate] == component) {
823 break;
824 }
825 }
826 if (immediate == gba->cpu->numComponents) {
827 return;
828 }
829 if (mode == MODE_ARM) {
830 int32_t value;
831 int32_t old;
832 value = 0xE1200070;
833 value |= immediate & 0xF;
834 value |= (immediate & 0xFFF0) << 4;
835 GBAPatch32(gba->cpu, address, value, &old);
836 *opcode = old;
837 } else {
838 int16_t value;
839 int16_t old;
840 value = 0xBE00;
841 value |= immediate & 0xFF;
842 GBAPatch16(gba->cpu, address, value, &old);
843 *opcode = (uint16_t) old;
844 }
845}
846
847void GBAClearBreakpoint(struct GBA* gba, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
848 if (mode == MODE_ARM) {
849 GBAPatch32(gba->cpu, address, opcode, 0);
850 } else {
851 GBAPatch16(gba->cpu, address, opcode, 0);
852 }
853}
854
855static bool _setSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
856 GBASetBreakpoint((struct GBA*) debugger->cpu->master, &debugger->d.p->d, address, mode, opcode);
857 return true;
858}
859
860static bool _clearSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
861 GBAClearBreakpoint((struct GBA*) debugger->cpu->master, address, mode, opcode);
862 return true;
863}