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