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