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#ifndef NDEBUG
259 if (cpu->cycles) {
260 mLOG(GBA, FATAL, "Cycles passed inexplicably: %i", cpu->cycles);
261 }
262#endif
263 nextEvent = mTimingTick(&gba->timing, nextEvent);
264 } while (gba->cpuBlocked);
265
266 cpu->nextEvent = nextEvent;
267
268 if (gba->earlyExit) {
269 gba->earlyExit = false;
270 break;
271 }
272 if (cpu->halted) {
273 cpu->cycles = nextEvent;
274 if (!gba->memory.io[REG_IME >> 1] || !gba->memory.io[REG_IE >> 1]) {
275 break;
276 }
277 }
278#ifndef NDEBUG
279 else if (nextEvent < 0) {
280 mLOG(GBA, FATAL, "Negative cycles will pass: %i", nextEvent);
281 }
282#endif
283 }
284#ifndef NDEBUG
285 if (gba->cpuBlocked) {
286 mLOG(GBA, FATAL, "CPU is blocked!");
287 }
288#endif
289}
290
291#ifdef USE_DEBUGGERS
292void GBAAttachDebugger(struct GBA* gba, struct mDebugger* debugger) {
293 gba->debugger = (struct ARMDebugger*) debugger->platform;
294 gba->debugger->setSoftwareBreakpoint = _setSoftwareBreakpoint;
295 gba->debugger->clearSoftwareBreakpoint = _clearSoftwareBreakpoint;
296 gba->cpu->components[CPU_COMPONENT_DEBUGGER] = &debugger->d;
297 ARMHotplugAttach(gba->cpu, CPU_COMPONENT_DEBUGGER);
298}
299
300void GBADetachDebugger(struct GBA* gba) {
301 if (gba->debugger) {
302 ARMHotplugDetach(gba->cpu, CPU_COMPONENT_DEBUGGER);
303 }
304 gba->cpu->components[CPU_COMPONENT_DEBUGGER] = NULL;
305 gba->debugger = NULL;
306}
307#endif
308
309bool GBALoadNull(struct GBA* gba) {
310 GBAUnloadROM(gba);
311 gba->romVf = NULL;
312 gba->pristineRomSize = 0;
313#ifndef FIXED_ROM_BUFFER
314 gba->memory.rom = anonymousMemoryMap(SIZE_CART0);
315#else
316 gba->memory.rom = romBuffer;
317#endif
318 gba->isPristine = false;
319 gba->yankedRomSize = 0;
320 gba->memory.romSize = SIZE_CART0;
321 gba->memory.romMask = SIZE_CART0 - 1;
322 gba->memory.mirroring = false;
323 gba->romCrc32 = 0;
324
325 if (gba->cpu) {
326 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
327 }
328 return true;
329}
330
331bool GBALoadMB(struct GBA* gba, struct VFile* vf) {
332 GBAUnloadROM(gba);
333 gba->romVf = vf;
334 gba->pristineRomSize = vf->size(vf);
335 vf->seek(vf, 0, SEEK_SET);
336 if (gba->pristineRomSize > SIZE_WORKING_RAM) {
337 gba->pristineRomSize = SIZE_WORKING_RAM;
338 }
339 gba->isPristine = true;
340 memset(gba->memory.wram, 0, SIZE_WORKING_RAM);
341 vf->read(vf, gba->memory.wram, gba->pristineRomSize);
342 if (!gba->memory.wram) {
343 mLOG(GBA, WARN, "Couldn't map ROM");
344 return false;
345 }
346 gba->yankedRomSize = 0;
347 gba->memory.romSize = 0;
348 gba->memory.romMask = 0;
349 gba->romCrc32 = doCrc32(gba->memory.wram, gba->pristineRomSize);
350 if (gba->cpu && gba->memory.activeRegion == REGION_WORKING_RAM) {
351 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
352 }
353 return true;
354}
355
356bool GBALoadROM(struct GBA* gba, struct VFile* vf) {
357 if (!vf) {
358 return false;
359 }
360 GBAUnloadROM(gba);
361 gba->romVf = vf;
362 gba->pristineRomSize = vf->size(vf);
363 vf->seek(vf, 0, SEEK_SET);
364 if (gba->pristineRomSize > SIZE_CART0) {
365 gba->pristineRomSize = SIZE_CART0;
366 }
367 gba->isPristine = true;
368#ifdef FIXED_ROM_BUFFER
369 if (gba->pristineRomSize <= romBufferSize) {
370 gba->memory.rom = romBuffer;
371 vf->read(vf, romBuffer, gba->pristineRomSize);
372 }
373#else
374 gba->memory.rom = vf->map(vf, gba->pristineRomSize, MAP_READ);
375#endif
376 if (!gba->memory.rom) {
377 mLOG(GBA, WARN, "Couldn't map ROM");
378 return false;
379 }
380 gba->yankedRomSize = 0;
381 gba->memory.romSize = gba->pristineRomSize;
382 gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
383 gba->memory.mirroring = false;
384 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
385 GBAHardwareInit(&gba->memory.hw, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
386 GBAVFameDetect(&gba->memory.vfame, gba->memory.rom, gba->memory.romSize);
387 if (popcount32(gba->memory.romSize) != 1) {
388 // This ROM is either a bad dump or homebrew. Emulate flash cart behavior.
389#ifndef FIXED_ROM_BUFFER
390 void* newRom = anonymousMemoryMap(SIZE_CART0);
391 memcpy(newRom, gba->memory.rom, gba->pristineRomSize);
392 gba->memory.rom = newRom;
393#endif
394 gba->memory.romSize = SIZE_CART0;
395 gba->isPristine = false;
396 }
397 if (gba->cpu && gba->memory.activeRegion >= REGION_CART0) {
398 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
399 }
400 // TODO: error check
401 return true;
402}
403
404bool GBALoadSave(struct GBA* gba, struct VFile* sav) {
405 GBASavedataInit(&gba->memory.savedata, sav);
406 return true;
407}
408
409void GBAYankROM(struct GBA* gba) {
410 gba->yankedRomSize = gba->memory.romSize;
411 gba->memory.romSize = 0;
412 gba->memory.romMask = 0;
413 GBARaiseIRQ(gba, IRQ_GAMEPAK);
414}
415
416void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
417 gba->biosVf = vf;
418 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
419 if (!bios) {
420 mLOG(GBA, WARN, "Couldn't map BIOS");
421 return;
422 }
423 gba->memory.bios = bios;
424 gba->memory.fullBios = 1;
425 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
426 mLOG(GBA, DEBUG, "BIOS Checksum: 0x%X", checksum);
427 if (checksum == GBA_BIOS_CHECKSUM) {
428 mLOG(GBA, INFO, "Official GBA BIOS detected");
429 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
430 mLOG(GBA, INFO, "Official GBA (DS) BIOS detected");
431 } else {
432 mLOG(GBA, WARN, "BIOS checksum incorrect");
433 }
434 gba->biosChecksum = checksum;
435 if (gba->memory.activeRegion == REGION_BIOS) {
436 gba->cpu->memory.activeRegion = gba->memory.bios;
437 }
438 // TODO: error check
439}
440
441void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
442 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
443 if (!patchedSize || patchedSize > SIZE_CART0) {
444 return;
445 }
446 void* newRom = anonymousMemoryMap(SIZE_CART0);
447 if (!patch->applyPatch(patch, gba->memory.rom, gba->pristineRomSize, newRom, patchedSize)) {
448 mappedMemoryFree(newRom, SIZE_CART0);
449 return;
450 }
451 if (gba->romVf) {
452#ifndef FIXED_ROM_BUFFER
453 gba->romVf->unmap(gba->romVf, gba->memory.rom, gba->pristineRomSize);
454#endif
455 gba->romVf->close(gba->romVf);
456 gba->romVf = NULL;
457 }
458 gba->isPristine = false;
459 gba->memory.rom = newRom;
460 gba->memory.hw.gpioBase = &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1];
461 gba->memory.romSize = patchedSize;
462 gba->memory.romMask = SIZE_CART0 - 1;
463 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
464}
465
466void GBAWriteIE(struct GBA* gba, uint16_t value) {
467 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
468 ARMRaiseIRQ(gba->cpu);
469 }
470}
471
472void GBAWriteIME(struct GBA* gba, uint16_t value) {
473 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
474 ARMRaiseIRQ(gba->cpu);
475 }
476}
477
478void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
479 gba->memory.io[REG_IF >> 1] |= 1 << irq;
480
481 if (gba->memory.io[REG_IE >> 1] & 1 << irq) {
482 gba->cpu->halted = 0;
483 if (gba->memory.io[REG_IME >> 1]) {
484 ARMRaiseIRQ(gba->cpu);
485 }
486 }
487}
488
489void GBATestIRQ(struct ARMCore* cpu) {
490 struct GBA* gba = (struct GBA*) cpu->master;
491 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
492 gba->springIRQ = gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1];
493 gba->cpu->nextEvent = gba->cpu->cycles;
494 }
495}
496
497void GBAHalt(struct GBA* gba) {
498 gba->cpu->nextEvent = gba->cpu->cycles;
499 gba->cpu->halted = 1;
500}
501
502void GBAStop(struct GBA* gba) {
503 size_t c;
504 for (c = 0; c < mCoreCallbacksListSize(&gba->coreCallbacks); ++c) {
505 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gba->coreCallbacks, c);
506 if (callbacks->sleep) {
507 callbacks->sleep(callbacks->context);
508 }
509 }
510 gba->cpu->nextEvent = gba->cpu->cycles;
511}
512
513void GBADebug(struct GBA* gba, uint16_t flags) {
514 gba->debugFlags = flags;
515 if (GBADebugFlagsIsSend(gba->debugFlags)) {
516 int level = 1 << GBADebugFlagsGetLevel(gba->debugFlags);
517 level &= 0x1F;
518 char oolBuf[0x101];
519 strncpy(oolBuf, gba->debugString, sizeof(gba->debugString));
520 oolBuf[0x100] = '\0';
521 mLog(_mLOG_CAT_GBA_DEBUG(), level, "%s", oolBuf);
522 }
523 gba->debugFlags = GBADebugFlagsClearSend(gba->debugFlags);
524}
525
526bool GBAIsROM(struct VFile* vf) {
527#ifdef USE_ELF
528 struct ELF* elf = ELFOpen(vf);
529 if (elf) {
530 uint32_t entry = ELFEntry(elf);
531 bool isGBA = true;
532 isGBA = isGBA && ELFMachine(elf) == EM_ARM;
533 isGBA = isGBA && (entry == BASE_CART0 || entry == BASE_WORKING_RAM);
534 ELFClose(elf);
535 return isGBA;
536 }
537#endif
538 if (!vf) {
539 return false;
540 }
541 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
542 return false;
543 }
544 uint8_t signature[sizeof(GBA_ROM_MAGIC)];
545 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
546 return false;
547 }
548 if (GBAIsBIOS(vf)) {
549 return false;
550 }
551 return memcmp(signature, GBA_ROM_MAGIC, sizeof(signature)) == 0;
552}
553
554bool GBAIsMB(struct VFile* vf) {
555 if (!GBAIsROM(vf)) {
556 return false;
557 }
558#ifdef USE_ELF
559 struct ELF* elf = ELFOpen(vf);
560 if (elf) {
561 bool isMB = ELFEntry(elf) == BASE_WORKING_RAM;
562 ELFClose(elf);
563 return isMB;
564 }
565#endif
566 if (vf->size(vf) > SIZE_WORKING_RAM) {
567 return false;
568 }
569 if (vf->seek(vf, GBA_MB_MAGIC_OFFSET, SEEK_SET) < 0) {
570 return false;
571 }
572 uint32_t signature;
573 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
574 return false;
575 }
576 uint32_t opcode;
577 LOAD_32(opcode, 0, &signature);
578 struct ARMInstructionInfo info;
579 ARMDecodeARM(opcode, &info);
580 if (info.branchType == ARM_BRANCH) {
581 if (info.op1.immediate <= 0) {
582 return false;
583 } else if (info.op1.immediate == 28) {
584 // Ancient toolchain that is known to throw MB detection for a loop
585 return false;
586 } else if (info.op1.immediate != 24) {
587 return true;
588 }
589 }
590
591 uint32_t pc = GBA_MB_MAGIC_OFFSET;
592 int i;
593 for (i = 0; i < 80; ++i) {
594 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
595 break;
596 }
597 pc += 4;
598 LOAD_32(opcode, 0, &signature);
599 ARMDecodeARM(opcode, &info);
600 if (info.mnemonic != ARM_MN_LDR) {
601 continue;
602 }
603 if ((info.operandFormat & ARM_OPERAND_MEMORY) && info.memory.baseReg == ARM_PC && info.memory.format & ARM_MEMORY_IMMEDIATE_OFFSET) {
604 uint32_t immediate = info.memory.offset.immediate;
605 if (info.memory.format & ARM_MEMORY_OFFSET_SUBTRACT) {
606 immediate = -immediate;
607 }
608 immediate += pc + 8;
609 if (vf->seek(vf, immediate, SEEK_SET) < 0) {
610 break;
611 }
612 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
613 break;
614 }
615 LOAD_32(immediate, 0, &signature);
616 if (vf->seek(vf, pc, SEEK_SET) < 0) {
617 break;
618 }
619 if ((immediate & ~0x7FF) == BASE_WORKING_RAM) {
620 return true;
621 }
622 }
623 }
624 // Found a libgba-linked cart...these are a bit harder to detect.
625 return false;
626}
627
628bool GBAIsBIOS(struct VFile* vf) {
629 if (vf->seek(vf, 0, SEEK_SET) < 0) {
630 return false;
631 }
632 uint8_t interruptTable[7 * 4];
633 if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
634 return false;
635 }
636 int i;
637 for (i = 0; i < 7; ++i) {
638 if (interruptTable[4 * i + 3] != 0xEA || interruptTable[4 * i + 2]) {
639 return false;
640 }
641 }
642 return true;
643}
644
645void GBAGetGameCode(const struct GBA* gba, char* out) {
646 memset(out, 0, 8);
647 if (!gba->memory.rom) {
648 return;
649 }
650
651 memcpy(out, "AGB-", 4);
652 memcpy(&out[4], &((struct GBACartridge*) gba->memory.rom)->id, 4);
653}
654
655void GBAGetGameTitle(const struct GBA* gba, char* out) {
656 if (gba->memory.rom) {
657 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
658 return;
659 }
660 if (gba->isPristine && gba->memory.wram) {
661 memcpy(out, &((struct GBACartridge*) gba->memory.wram)->title, 12);
662 return;
663 }
664 strncpy(out, "(BIOS)", 12);
665}
666
667void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
668 struct GBA* gba = (struct GBA*) cpu->master;
669#ifdef USE_DEBUGGERS
670 if (gba->debugger) {
671 struct mDebuggerEntryInfo info = {
672 .address = _ARMPCAddress(cpu),
673 .type.bp.opcode = opcode
674 };
675 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_ILLEGAL_OP, &info);
676 }
677#endif
678 // TODO: More sensible category?
679 mLOG(GBA, ERROR, "Stub opcode: %08x", opcode);
680}
681
682void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
683 struct GBA* gba = (struct GBA*) cpu->master;
684 if (!gba->yankedRomSize) {
685 // TODO: More sensible category?
686 mLOG(GBA, WARN, "Illegal opcode: %08x", opcode);
687 }
688 if (cpu->executionMode == MODE_THUMB && (opcode & 0xFFC0) == 0xE800) {
689 mLOG(GBA, DEBUG, "Hit Wii U VC opcode: %08x", opcode);
690 return;
691 }
692#ifdef USE_DEBUGGERS
693 if (gba->debugger) {
694 struct mDebuggerEntryInfo info = {
695 .address = _ARMPCAddress(cpu),
696 .type.bp.opcode = opcode
697 };
698 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_ILLEGAL_OP, &info);
699 } else
700#endif
701 {
702 ARMRaiseUndefined(cpu);
703 }
704}
705
706void GBABreakpoint(struct ARMCore* cpu, int immediate) {
707 struct GBA* gba = (struct GBA*) cpu->master;
708 if (immediate >= CPU_COMPONENT_MAX) {
709 return;
710 }
711 switch (immediate) {
712#ifdef USE_DEBUGGERS
713 case CPU_COMPONENT_DEBUGGER:
714 if (gba->debugger) {
715 struct mDebuggerEntryInfo info = {
716 .address = _ARMPCAddress(cpu),
717 .type.bp.breakType = BREAKPOINT_SOFTWARE
718 };
719 mDebuggerEnter(gba->debugger->d.p, DEBUGGER_ENTER_BREAKPOINT, &info);
720 }
721 break;
722#endif
723 case CPU_COMPONENT_CHEAT_DEVICE:
724 if (gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
725 struct mCheatDevice* device = (struct mCheatDevice*) gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
726 struct GBACheatHook* hook = 0;
727 size_t i;
728 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
729 struct GBACheatSet* cheats = (struct GBACheatSet*) *mCheatSetsGetPointer(&device->cheats, i);
730 if (cheats->hook && cheats->hook->address == _ARMPCAddress(cpu)) {
731 mCheatRefresh(device, &cheats->d);
732 hook = cheats->hook;
733 }
734 }
735 if (hook) {
736 ARMRunFake(cpu, hook->patchedOpcode);
737 }
738 }
739 break;
740 default:
741 break;
742 }
743}
744
745void GBAFrameStarted(struct GBA* gba) {
746 GBATestKeypadIRQ(gba);
747
748 size_t c;
749 for (c = 0; c < mCoreCallbacksListSize(&gba->coreCallbacks); ++c) {
750 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gba->coreCallbacks, c);
751 if (callbacks->videoFrameStarted) {
752 callbacks->videoFrameStarted(callbacks->context);
753 }
754 }
755}
756
757void GBAFrameEnded(struct GBA* gba) {
758 GBASavedataClean(&gba->memory.savedata, gba->video.frameCounter);
759
760 if (gba->rr) {
761 gba->rr->nextFrame(gba->rr);
762 }
763
764 if (gba->cpu->components && gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
765 struct mCheatDevice* device = (struct mCheatDevice*) gba->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
766 size_t i;
767 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
768 struct GBACheatSet* cheats = (struct GBACheatSet*) *mCheatSetsGetPointer(&device->cheats, i);
769 mCheatRefresh(device, &cheats->d);
770 }
771 }
772
773 if (gba->stream && gba->stream->postVideoFrame) {
774 const color_t* pixels;
775 size_t stride;
776 gba->video.renderer->getPixels(gba->video.renderer, &stride, (const void**) &pixels);
777 gba->stream->postVideoFrame(gba->stream, pixels, stride);
778 }
779
780 if (gba->memory.hw.devices & (HW_GB_PLAYER | HW_GB_PLAYER_DETECTION)) {
781 GBAHardwarePlayerUpdate(gba);
782 }
783
784 size_t c;
785 for (c = 0; c < mCoreCallbacksListSize(&gba->coreCallbacks); ++c) {
786 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gba->coreCallbacks, c);
787 if (callbacks->videoFrameEnded) {
788 callbacks->videoFrameEnded(callbacks->context);
789 }
790 }
791}
792
793void GBATestKeypadIRQ(struct GBA* gba) {
794 uint16_t keycnt = gba->memory.io[REG_KEYCNT >> 1];
795 if (!(keycnt & 0x4000)) {
796 return;
797 }
798 int isAnd = keycnt & 0x8000;
799 if (!gba->keySource) {
800 // TODO?
801 return;
802 }
803
804 keycnt &= 0x3FF;
805 uint16_t keyInput = *gba->keySource & keycnt;
806
807 if (isAnd && keycnt == keyInput) {
808 GBARaiseIRQ(gba, IRQ_KEYPAD);
809 } else if (!isAnd && keyInput) {
810 GBARaiseIRQ(gba, IRQ_KEYPAD);
811 }
812}
813
814void GBASetBreakpoint(struct GBA* gba, struct mCPUComponent* component, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
815 size_t immediate;
816 for (immediate = 0; immediate < gba->cpu->numComponents; ++immediate) {
817 if (gba->cpu->components[immediate] == component) {
818 break;
819 }
820 }
821 if (immediate == gba->cpu->numComponents) {
822 return;
823 }
824 if (mode == MODE_ARM) {
825 int32_t value;
826 int32_t old;
827 value = 0xE1200070;
828 value |= immediate & 0xF;
829 value |= (immediate & 0xFFF0) << 4;
830 GBAPatch32(gba->cpu, address, value, &old);
831 *opcode = old;
832 } else {
833 int16_t value;
834 int16_t old;
835 value = 0xBE00;
836 value |= immediate & 0xFF;
837 GBAPatch16(gba->cpu, address, value, &old);
838 *opcode = (uint16_t) old;
839 }
840}
841
842void GBAClearBreakpoint(struct GBA* gba, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
843 if (mode == MODE_ARM) {
844 GBAPatch32(gba->cpu, address, opcode, 0);
845 } else {
846 GBAPatch16(gba->cpu, address, opcode, 0);
847 }
848}
849
850static bool _setSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t* opcode) {
851 GBASetBreakpoint((struct GBA*) debugger->cpu->master, &debugger->d.p->d, address, mode, opcode);
852 return true;
853}
854
855static bool _clearSoftwareBreakpoint(struct ARMDebugger* debugger, uint32_t address, enum ExecutionMode mode, uint32_t opcode) {
856 GBAClearBreakpoint((struct GBA*) debugger->cpu->master, address, mode, opcode);
857 return true;
858}