src/gba/bios.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/bios.h>
7
8#include <mgba/internal/arm/isa-inlines.h>
9#include <mgba/internal/arm/macros.h>
10#include <mgba/internal/gba/gba.h>
11#include <mgba/internal/gba/io.h>
12#include <mgba/internal/gba/memory.h>
13#include <mgba-util/math.h>
14
15const uint32_t GBA_BIOS_CHECKSUM = 0xBAAE187F;
16const uint32_t GBA_DS_BIOS_CHECKSUM = 0xBAAE1880;
17
18mLOG_DEFINE_CATEGORY(GBA_BIOS, "GBA BIOS", "gba.bios");
19
20static void _unLz77(struct GBA* gba, int width);
21static void _unHuffman(struct GBA* gba);
22static void _unRl(struct GBA* gba, int width);
23static void _unFilter(struct GBA* gba, int inwidth, int outwidth);
24static void _unBitPack(struct GBA* gba);
25
26static int _mulWait(int32_t r) {
27 if ((r & 0xFFFFFF00) == 0xFFFFFF00 || !(r & 0xFFFFFF00)) {
28 return 1;
29 } else if ((r & 0xFFFF0000) == 0xFFFF0000 || !(r & 0xFFFF0000)) {
30 return 2;
31 } else if ((r & 0xFF000000) == 0xFF000000 || !(r & 0xFF000000)) {
32 return 3;
33 } else {
34 return 4;
35 }
36}
37
38static void _SoftReset(struct GBA* gba) {
39 struct ARMCore* cpu = gba->cpu;
40 ARMSetPrivilegeMode(cpu, MODE_IRQ);
41 cpu->spsr.packed = 0;
42 cpu->gprs[ARM_LR] = 0;
43 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
44 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
45 cpu->spsr.packed = 0;
46 cpu->gprs[ARM_LR] = 0;
47 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
48 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
49 cpu->gprs[ARM_LR] = 0;
50 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
51 int8_t flag = ((int8_t*) gba->memory.iwram)[0x7FFA];
52 memset(((int8_t*) gba->memory.iwram) + SIZE_WORKING_IRAM - 0x200, 0, 0x200);
53 if (flag) {
54 cpu->gprs[ARM_PC] = BASE_WORKING_RAM;
55 } else {
56 cpu->gprs[ARM_PC] = BASE_CART0;
57 }
58 _ARMSetMode(cpu, MODE_ARM);
59 ARMWritePC(cpu);
60}
61
62static void _RegisterRamReset(struct GBA* gba) {
63 uint32_t registers = gba->cpu->gprs[0];
64 struct ARMCore* cpu = gba->cpu;
65 cpu->memory.store16(cpu, BASE_IO | REG_DISPCNT, 0x0080, 0);
66 if (registers & 0x01) {
67 memset(gba->memory.wram, 0, SIZE_WORKING_RAM);
68 }
69 if (registers & 0x02) {
70 memset(gba->memory.iwram, 0, SIZE_WORKING_IRAM - 0x200);
71 }
72 if (registers & 0x04) {
73 memset(gba->video.palette, 0, SIZE_PALETTE_RAM);
74 }
75 if (registers & 0x08) {
76 memset(gba->video.vram, 0, SIZE_VRAM);
77 }
78 if (registers & 0x10) {
79 memset(gba->video.oam.raw, 0, SIZE_OAM);
80 }
81 if (registers & 0x20) {
82 cpu->memory.store16(cpu, BASE_IO | REG_SIOCNT, 0x0000, 0);
83 cpu->memory.store16(cpu, BASE_IO | REG_RCNT, RCNT_INITIAL, 0);
84 cpu->memory.store16(cpu, BASE_IO | REG_SIOMLT_SEND, 0, 0);
85 cpu->memory.store16(cpu, BASE_IO | REG_JOYCNT, 0, 0);
86 cpu->memory.store32(cpu, BASE_IO | REG_JOY_RECV_LO, 0, 0);
87 cpu->memory.store32(cpu, BASE_IO | REG_JOY_TRANS_LO, 0, 0);
88 }
89 if (registers & 0x40) {
90 cpu->memory.store16(cpu, BASE_IO | REG_SOUND1CNT_LO, 0, 0);
91 cpu->memory.store16(cpu, BASE_IO | REG_SOUND1CNT_HI, 0, 0);
92 cpu->memory.store16(cpu, BASE_IO | REG_SOUND1CNT_X, 0, 0);
93 cpu->memory.store16(cpu, BASE_IO | REG_SOUND2CNT_LO, 0, 0);
94 cpu->memory.store16(cpu, BASE_IO | REG_SOUND2CNT_HI, 0, 0);
95 cpu->memory.store16(cpu, BASE_IO | REG_SOUND3CNT_LO, 0, 0);
96 cpu->memory.store16(cpu, BASE_IO | REG_SOUND3CNT_HI, 0, 0);
97 cpu->memory.store16(cpu, BASE_IO | REG_SOUND3CNT_X, 0, 0);
98 cpu->memory.store16(cpu, BASE_IO | REG_SOUND4CNT_LO, 0, 0);
99 cpu->memory.store16(cpu, BASE_IO | REG_SOUND4CNT_HI, 0, 0);
100 cpu->memory.store16(cpu, BASE_IO | REG_SOUNDCNT_LO, 0, 0);
101 cpu->memory.store16(cpu, BASE_IO | REG_SOUNDCNT_HI, 0, 0);
102 cpu->memory.store16(cpu, BASE_IO | REG_SOUNDCNT_X, 0, 0);
103 cpu->memory.store16(cpu, BASE_IO | REG_SOUNDBIAS, 0x200, 0);
104 memset(gba->audio.psg.ch3.wavedata32, 0, sizeof(gba->audio.psg.ch3.wavedata32));
105 }
106 if (registers & 0x80) {
107 cpu->memory.store16(cpu, BASE_IO | 0x04, 0, 0);
108 cpu->memory.store16(cpu, BASE_IO | 0x06, 0, 0);
109 cpu->memory.store16(cpu, BASE_IO | 0x08, 0, 0);
110 cpu->memory.store16(cpu, BASE_IO | 0x0A, 0, 0);
111 cpu->memory.store16(cpu, BASE_IO | 0x0C, 0, 0);
112 cpu->memory.store16(cpu, BASE_IO | 0x0E, 0, 0);
113 cpu->memory.store16(cpu, BASE_IO | 0x10, 0, 0);
114 cpu->memory.store16(cpu, BASE_IO | 0x12, 0, 0);
115 cpu->memory.store16(cpu, BASE_IO | 0x14, 0, 0);
116 cpu->memory.store16(cpu, BASE_IO | 0x16, 0, 0);
117 cpu->memory.store16(cpu, BASE_IO | 0x18, 0, 0);
118 cpu->memory.store16(cpu, BASE_IO | 0x1A, 0, 0);
119 cpu->memory.store16(cpu, BASE_IO | 0x1C, 0, 0);
120 cpu->memory.store16(cpu, BASE_IO | 0x1E, 0, 0);
121 cpu->memory.store16(cpu, BASE_IO | REG_BG2PA, 0x100, 0);
122 cpu->memory.store16(cpu, BASE_IO | REG_BG2PB, 0, 0);
123 cpu->memory.store16(cpu, BASE_IO | REG_BG2PC, 0, 0);
124 cpu->memory.store16(cpu, BASE_IO | REG_BG2PD, 0x100, 0);
125 cpu->memory.store32(cpu, BASE_IO | 0x28, 0, 0);
126 cpu->memory.store32(cpu, BASE_IO | 0x2C, 0, 0);
127 cpu->memory.store16(cpu, BASE_IO | REG_BG3PA, 0x100, 0);
128 cpu->memory.store16(cpu, BASE_IO | REG_BG3PB, 0, 0);
129 cpu->memory.store16(cpu, BASE_IO | REG_BG3PC, 0, 0);
130 cpu->memory.store16(cpu, BASE_IO | REG_BG3PD, 0x100, 0);
131 cpu->memory.store32(cpu, BASE_IO | 0x38, 0, 0);
132 cpu->memory.store32(cpu, BASE_IO | 0x3C, 0, 0);
133 cpu->memory.store16(cpu, BASE_IO | 0x40, 0, 0);
134 cpu->memory.store16(cpu, BASE_IO | 0x42, 0, 0);
135 cpu->memory.store16(cpu, BASE_IO | 0x44, 0, 0);
136 cpu->memory.store16(cpu, BASE_IO | 0x46, 0, 0);
137 cpu->memory.store16(cpu, BASE_IO | 0x48, 0, 0);
138 cpu->memory.store16(cpu, BASE_IO | 0x4A, 0, 0);
139 cpu->memory.store16(cpu, BASE_IO | 0x4C, 0, 0);
140 cpu->memory.store16(cpu, BASE_IO | 0x50, 0, 0);
141 cpu->memory.store16(cpu, BASE_IO | 0x52, 0, 0);
142 cpu->memory.store16(cpu, BASE_IO | 0x54, 0, 0);
143 cpu->memory.store16(cpu, BASE_IO | 0xB0, 0, 0);
144 cpu->memory.store16(cpu, BASE_IO | 0xB2, 0, 0);
145 cpu->memory.store16(cpu, BASE_IO | 0xB4, 0, 0);
146 cpu->memory.store16(cpu, BASE_IO | 0xB6, 0, 0);
147 cpu->memory.store16(cpu, BASE_IO | 0xB8, 0, 0);
148 cpu->memory.store16(cpu, BASE_IO | 0xBA, 0, 0);
149 cpu->memory.store16(cpu, BASE_IO | 0xBC, 0, 0);
150 cpu->memory.store16(cpu, BASE_IO | 0xBE, 0, 0);
151 cpu->memory.store16(cpu, BASE_IO | 0xC0, 0, 0);
152 cpu->memory.store16(cpu, BASE_IO | 0xC2, 0, 0);
153 cpu->memory.store16(cpu, BASE_IO | 0xC4, 0, 0);
154 cpu->memory.store16(cpu, BASE_IO | 0xC6, 0, 0);
155 cpu->memory.store16(cpu, BASE_IO | 0xC8, 0, 0);
156 cpu->memory.store16(cpu, BASE_IO | 0xCA, 0, 0);
157 cpu->memory.store16(cpu, BASE_IO | 0xCC, 0, 0);
158 cpu->memory.store16(cpu, BASE_IO | 0xCE, 0, 0);
159 cpu->memory.store16(cpu, BASE_IO | 0xD0, 0, 0);
160 cpu->memory.store16(cpu, BASE_IO | 0xD2, 0, 0);
161 cpu->memory.store16(cpu, BASE_IO | 0xD4, 0, 0);
162 cpu->memory.store16(cpu, BASE_IO | 0xD6, 0, 0);
163 cpu->memory.store16(cpu, BASE_IO | 0xD8, 0, 0);
164 cpu->memory.store16(cpu, BASE_IO | 0xDA, 0, 0);
165 cpu->memory.store16(cpu, BASE_IO | 0xDC, 0, 0);
166 cpu->memory.store16(cpu, BASE_IO | 0xDE, 0, 0);
167 cpu->memory.store16(cpu, BASE_IO | 0x100, 0, 0);
168 cpu->memory.store16(cpu, BASE_IO | 0x102, 0, 0);
169 cpu->memory.store16(cpu, BASE_IO | 0x104, 0, 0);
170 cpu->memory.store16(cpu, BASE_IO | 0x106, 0, 0);
171 cpu->memory.store16(cpu, BASE_IO | 0x108, 0, 0);
172 cpu->memory.store16(cpu, BASE_IO | 0x10A, 0, 0);
173 cpu->memory.store16(cpu, BASE_IO | 0x10C, 0, 0);
174 cpu->memory.store16(cpu, BASE_IO | 0x10E, 0, 0);
175 cpu->memory.store16(cpu, BASE_IO | 0x200, 0, 0);
176 cpu->memory.store16(cpu, BASE_IO | 0x202, 0xFFFF, 0);
177 cpu->memory.store16(cpu, BASE_IO | 0x204, 0, 0);
178 cpu->memory.store16(cpu, BASE_IO | 0x208, 0, 0);
179 }
180 if (registers & 0x9C) {
181 gba->video.renderer->reset(gba->video.renderer);
182 gba->video.renderer->writeVideoRegister(gba->video.renderer, REG_DISPCNT, gba->memory.io[REG_DISPCNT >> 1]);
183 int i;
184 for (i = REG_BG0CNT; i < REG_SOUND1CNT_LO; i += 2) {
185 gba->video.renderer->writeVideoRegister(gba->video.renderer, i, gba->memory.io[i >> 1]);
186 }
187 }
188}
189
190static void _BgAffineSet(struct GBA* gba) {
191 struct ARMCore* cpu = gba->cpu;
192 int i = cpu->gprs[2];
193 float ox, oy;
194 float cx, cy;
195 float sx, sy;
196 float theta;
197 int offset = cpu->gprs[0];
198 int destination = cpu->gprs[1];
199 float a, b, c, d;
200 float rx, ry;
201 while (i--) {
202 // [ sx 0 0 ] [ cos(theta) -sin(theta) 0 ] [ 1 0 cx - ox ] [ A B rx ]
203 // [ 0 sy 0 ] * [ sin(theta) cos(theta) 0 ] * [ 0 1 cy - oy ] = [ C D ry ]
204 // [ 0 0 1 ] [ 0 0 1 ] [ 0 0 1 ] [ 0 0 1 ]
205 ox = (int32_t) cpu->memory.load32(cpu, offset, 0) / 256.f;
206 oy = (int32_t) cpu->memory.load32(cpu, offset + 4, 0) / 256.f;
207 cx = (int16_t) cpu->memory.load16(cpu, offset + 8, 0);
208 cy = (int16_t) cpu->memory.load16(cpu, offset + 10, 0);
209 sx = (int16_t) cpu->memory.load16(cpu, offset + 12, 0) / 256.f;
210 sy = (int16_t) cpu->memory.load16(cpu, offset + 14, 0) / 256.f;
211 theta = (cpu->memory.load16(cpu, offset + 16, 0) >> 8) / 128.f * M_PI;
212 offset += 20;
213 // Rotation
214 a = d = cosf(theta);
215 b = c = sinf(theta);
216 // Scale
217 a *= sx;
218 b *= -sx;
219 c *= sy;
220 d *= sy;
221 // Translate
222 rx = ox - (a * cx + b * cy);
223 ry = oy - (c * cx + d * cy);
224 cpu->memory.store16(cpu, destination, a * 256, 0);
225 cpu->memory.store16(cpu, destination + 2, b * 256, 0);
226 cpu->memory.store16(cpu, destination + 4, c * 256, 0);
227 cpu->memory.store16(cpu, destination + 6, d * 256, 0);
228 cpu->memory.store32(cpu, destination + 8, rx * 256, 0);
229 cpu->memory.store32(cpu, destination + 12, ry * 256, 0);
230 destination += 16;
231 }
232}
233
234static void _ObjAffineSet(struct GBA* gba) {
235 struct ARMCore* cpu = gba->cpu;
236 int i = cpu->gprs[2];
237 float sx, sy;
238 float theta;
239 int offset = cpu->gprs[0];
240 int destination = cpu->gprs[1];
241 int diff = cpu->gprs[3];
242 float a, b, c, d;
243 while (i--) {
244 // [ sx 0 ] [ cos(theta) -sin(theta) ] [ A B ]
245 // [ 0 sy ] * [ sin(theta) cos(theta) ] = [ C D ]
246 sx = (int16_t) cpu->memory.load16(cpu, offset, 0) / 256.f;
247 sy = (int16_t) cpu->memory.load16(cpu, offset + 2, 0) / 256.f;
248 theta = (cpu->memory.load16(cpu, offset + 4, 0) >> 8) / 128.f * M_PI;
249 offset += 8;
250 // Rotation
251 a = d = cosf(theta);
252 b = c = sinf(theta);
253 // Scale
254 a *= sx;
255 b *= -sx;
256 c *= sy;
257 d *= sy;
258 cpu->memory.store16(cpu, destination, a * 256, 0);
259 cpu->memory.store16(cpu, destination + diff, b * 256, 0);
260 cpu->memory.store16(cpu, destination + diff * 2, c * 256, 0);
261 cpu->memory.store16(cpu, destination + diff * 3, d * 256, 0);
262 destination += diff * 4;
263 }
264}
265
266static void _MidiKey2Freq(struct GBA* gba) {
267 struct ARMCore* cpu = gba->cpu;
268
269 int oldRegion = gba->memory.activeRegion;
270 gba->memory.activeRegion = REGION_BIOS;
271 uint32_t key = cpu->memory.load32(cpu, cpu->gprs[0] + 4, 0);
272 gba->memory.activeRegion = oldRegion;
273
274 cpu->gprs[0] = key / exp2f((180.f - cpu->gprs[1] - cpu->gprs[2] / 256.f) / 12.f);
275}
276
277static void _Div(struct GBA* gba, int32_t num, int32_t denom) {
278 struct ARMCore* cpu = gba->cpu;
279 if (denom != 0 && (denom != -1 || num != INT32_MIN)) {
280 div_t result = div(num, denom);
281 cpu->gprs[0] = result.quot;
282 cpu->gprs[1] = result.rem;
283 cpu->gprs[3] = abs(result.quot);
284 } else if (denom == 0) {
285 mLOG(GBA_BIOS, GAME_ERROR, "Attempting to divide %i by zero!", num);
286 // If abs(num) > 1, this should hang, but that would be painful to
287 // emulate in HLE, and no game will get into a state where it hangs...
288 cpu->gprs[0] = (num < 0) ? -1 : 1;
289 cpu->gprs[1] = num;
290 cpu->gprs[3] = 1;
291 } else {
292 mLOG(GBA_BIOS, GAME_ERROR, "Attempting to divide INT_MIN by -1!");
293 cpu->gprs[0] = INT32_MIN;
294 cpu->gprs[1] = 0;
295 cpu->gprs[3] = INT32_MIN;
296 }
297 int loops = clz32(denom) - clz32(num);
298 if (loops < 1) {
299 loops = 1;
300 }
301 cpu->cycles += 4 /* prologue */ + 13 * loops + 7 /* epilogue */;
302}
303
304static int16_t _ArcTan(int32_t i, int32_t* r1, int32_t* r3, int32_t* cycles) {
305 int currentCycles = 37;
306 currentCycles += _mulWait(i * i);
307 int32_t a = -((i * i) >> 14);
308 currentCycles += _mulWait(0xA9 * a);
309 int32_t b = ((0xA9 * a) >> 14) + 0x390;
310 currentCycles += _mulWait(b * a);
311 b = ((b * a) >> 14) + 0x91C;
312 currentCycles += _mulWait(b * a);
313 b = ((b * a) >> 14) + 0xFB6;
314 currentCycles += _mulWait(b * a);
315 b = ((b * a) >> 14) + 0x16AA;
316 currentCycles += _mulWait(b * a);
317 b = ((b * a) >> 14) + 0x2081;
318 currentCycles += _mulWait(b * a);
319 b = ((b * a) >> 14) + 0x3651;
320 currentCycles += _mulWait(b * a);
321 b = ((b * a) >> 14) + 0xA2F9;
322 if (r1) {
323 *r1 = a;
324 }
325 if (r3) {
326 *r3 = b;
327 }
328 *cycles += currentCycles;
329 return (i * b) >> 16;
330}
331
332static int16_t _ArcTan2(int32_t x, int32_t y, int32_t* r1, int32_t* cycles) {
333 if (!y) {
334 if (x >= 0) {
335 return 0;
336 }
337 return 0x8000;
338 }
339 if (!x) {
340 if (y >= 0) {
341 return 0x4000;
342 }
343 return 0xC000;
344 }
345 if (y >= 0) {
346 if (x >= 0) {
347 if (x >= y) {
348 return _ArcTan((y << 14) / x, r1, NULL, cycles);
349 }
350 } else if (-x >= y) {
351 return _ArcTan((y << 14) / x, r1, NULL, cycles) + 0x8000;
352 }
353 return 0x4000 - _ArcTan((x << 14) / y, r1, NULL, cycles);
354 } else {
355 if (x <= 0) {
356 if (-x > -y) {
357 return _ArcTan((y << 14) / x, r1, NULL, cycles) + 0x8000;
358 }
359 } else if (x >= -y) {
360 return _ArcTan((y << 14) / x, r1, NULL, cycles) + 0x10000;
361 }
362 return 0xC000 - _ArcTan((x << 14) / y, r1, NULL, cycles);
363 }
364}
365
366static int32_t _Sqrt(uint32_t x, int32_t* cycles) {
367 if (!x) {
368 *cycles += 53;
369 return 0;
370 }
371 int32_t currentCycles = 15;
372 uint32_t lower;
373 uint32_t upper = x;
374 uint32_t bound = 1;
375 while (bound < upper) {
376 upper >>= 1;
377 bound <<= 1;
378 currentCycles += 6;
379 }
380 while (true) {
381 currentCycles += 6;
382 upper = x;
383 uint32_t accum = 0;
384 lower = bound;
385 while (true) {
386 currentCycles += 5;
387 uint32_t oldLower = lower;
388 if (lower <= upper >> 1) {
389 lower <<= 1;
390 }
391 if (oldLower >= upper >> 1) {
392 break;
393 }
394 }
395 while (true) {
396 currentCycles += 8;
397 accum <<= 1;
398 if (upper >= lower) {
399 ++accum;
400 upper -= lower;
401 }
402 if (lower == bound) {
403 break;
404 }
405 lower >>= 1;
406 }
407 uint32_t oldBound = bound;
408 bound += accum;
409 bound >>= 1;
410 if (bound >= oldBound) {
411 bound = oldBound;
412 break;
413 }
414 }
415 *cycles += currentCycles;
416 return bound;
417}
418
419void GBASwi16(struct ARMCore* cpu, int immediate) {
420 struct GBA* gba = (struct GBA*) cpu->master;
421 mLOG(GBA_BIOS, DEBUG, "SWI: %02X r0: %08X r1: %08X r2: %08X r3: %08X",
422 immediate, cpu->gprs[0], cpu->gprs[1], cpu->gprs[2], cpu->gprs[3]);
423
424 switch (immediate) {
425 case 0xFA:
426 GBAPrintFlush(gba);
427 return;
428 }
429
430 if (gba->memory.fullBios) {
431 ARMRaiseSWI(cpu);
432 return;
433 }
434 switch (immediate) {
435 case 0x0:
436 _SoftReset(gba);
437 break;
438 case 0x1:
439 _RegisterRamReset(gba);
440 break;
441 case 0x2:
442 GBAHalt(gba);
443 break;
444 case 0x3:
445 GBAStop(gba);
446 break;
447 case 0x05:
448 // VBlankIntrWait
449 // Fall through:
450 case 0x04:
451 // IntrWait
452 ARMRaiseSWI(cpu);
453 break;
454 case 0x6:
455 _Div(gba, cpu->gprs[0], cpu->gprs[1]);
456 break;
457 case 0x7:
458 _Div(gba, cpu->gprs[1], cpu->gprs[0]);
459 break;
460 case 0x8:
461 cpu->gprs[0] = _Sqrt(cpu->gprs[0], &cpu->cycles);
462 break;
463 case 0x9:
464 cpu->gprs[0] = _ArcTan(cpu->gprs[0], &cpu->gprs[1], &cpu->gprs[3], &cpu->cycles);
465 break;
466 case 0xA:
467 cpu->gprs[0] = (uint16_t) _ArcTan2(cpu->gprs[0], cpu->gprs[1], &cpu->gprs[1], &cpu->cycles);
468 cpu->gprs[3] = 0x170;
469 break;
470 case 0xB:
471 case 0xC:
472 if (cpu->gprs[0] >> BASE_OFFSET < REGION_WORKING_RAM) {
473 mLOG(GBA_BIOS, GAME_ERROR, "Cannot CpuSet from BIOS");
474 break;
475 }
476 if (cpu->gprs[0] & (cpu->gprs[2] & (1 << 26) ? 3 : 1)) {
477 mLOG(GBA_BIOS, GAME_ERROR, "Misaligned CpuSet source");
478 }
479 if (cpu->gprs[1] & (cpu->gprs[2] & (1 << 26) ? 3 : 1)) {
480 mLOG(GBA_BIOS, GAME_ERROR, "Misaligned CpuSet destination");
481 }
482 ARMRaiseSWI(cpu);
483 break;
484 case 0xD:
485 cpu->gprs[0] = GBA_BIOS_CHECKSUM;
486 cpu->gprs[1] = 1;
487 cpu->gprs[3] = SIZE_BIOS;
488 break;
489 case 0xE:
490 _BgAffineSet(gba);
491 break;
492 case 0xF:
493 _ObjAffineSet(gba);
494 break;
495 case 0x10:
496 if (cpu->gprs[0] < BASE_WORKING_RAM) {
497 mLOG(GBA_BIOS, GAME_ERROR, "Bad BitUnPack source");
498 break;
499 }
500 switch (cpu->gprs[1] >> BASE_OFFSET) {
501 default:
502 mLOG(GBA_BIOS, GAME_ERROR, "Bad BitUnPack destination");
503 // Fall through
504 case REGION_WORKING_RAM:
505 case REGION_WORKING_IRAM:
506 case REGION_VRAM:
507 _unBitPack(gba);
508 break;
509 }
510 break;
511 case 0x11:
512 case 0x12:
513 if (cpu->gprs[0] < BASE_WORKING_RAM) {
514 mLOG(GBA_BIOS, GAME_ERROR, "Bad LZ77 source");
515 break;
516 }
517 switch (cpu->gprs[1] >> BASE_OFFSET) {
518 default:
519 mLOG(GBA_BIOS, GAME_ERROR, "Bad LZ77 destination");
520 // Fall through
521 case REGION_WORKING_RAM:
522 case REGION_WORKING_IRAM:
523 case REGION_VRAM:
524 _unLz77(gba, immediate == 0x11 ? 1 : 2);
525 break;
526 }
527 break;
528 case 0x13:
529 if (cpu->gprs[0] < BASE_WORKING_RAM) {
530 mLOG(GBA_BIOS, GAME_ERROR, "Bad Huffman source");
531 break;
532 }
533 switch (cpu->gprs[1] >> BASE_OFFSET) {
534 default:
535 mLOG(GBA_BIOS, GAME_ERROR, "Bad Huffman destination");
536 // Fall through
537 case REGION_WORKING_RAM:
538 case REGION_WORKING_IRAM:
539 case REGION_VRAM:
540 _unHuffman(gba);
541 break;
542 }
543 break;
544 case 0x14:
545 case 0x15:
546 if (cpu->gprs[0] < BASE_WORKING_RAM) {
547 mLOG(GBA_BIOS, GAME_ERROR, "Bad RL source");
548 break;
549 }
550 switch (cpu->gprs[1] >> BASE_OFFSET) {
551 default:
552 mLOG(GBA_BIOS, GAME_ERROR, "Bad RL destination");
553 // Fall through
554 case REGION_WORKING_RAM:
555 case REGION_WORKING_IRAM:
556 case REGION_VRAM:
557 _unRl(gba, immediate == 0x14 ? 1 : 2);
558 break;
559 }
560 break;
561 case 0x16:
562 case 0x17:
563 case 0x18:
564 if (cpu->gprs[0] < BASE_WORKING_RAM) {
565 mLOG(GBA_BIOS, GAME_ERROR, "Bad UnFilter source");
566 break;
567 }
568 switch (cpu->gprs[1] >> BASE_OFFSET) {
569 default:
570 mLOG(GBA_BIOS, GAME_ERROR, "Bad UnFilter destination");
571 // Fall through
572 case REGION_WORKING_RAM:
573 case REGION_WORKING_IRAM:
574 case REGION_VRAM:
575 _unFilter(gba, immediate == 0x18 ? 2 : 1, immediate == 0x16 ? 1 : 2);
576 break;
577 }
578 break;
579 case 0x19:
580 // SoundBias is mostly meaningless here
581 mLOG(GBA_BIOS, STUB, "Stub software interrupt: SoundBias (19)");
582 break;
583 case 0x1F:
584 _MidiKey2Freq(gba);
585 break;
586 default:
587 mLOG(GBA_BIOS, STUB, "Stub software interrupt: %02X", immediate);
588 }
589 gba->cpu->cycles += 45 + cpu->memory.activeNonseqCycles16 /* 8 bit load for SWI # */;
590 // Return cycles
591 if (gba->cpu->executionMode == MODE_ARM) {
592 gba->cpu->cycles += cpu->memory.activeNonseqCycles32 + cpu->memory.activeSeqCycles32;
593 } else {
594 gba->cpu->cycles += cpu->memory.activeNonseqCycles16 + cpu->memory.activeSeqCycles16;
595 }
596 gba->memory.biosPrefetch = 0xE3A02004;
597}
598
599void GBASwi32(struct ARMCore* cpu, int immediate) {
600 GBASwi16(cpu, immediate >> 16);
601}
602
603uint32_t GBAChecksum(uint32_t* memory, size_t size) {
604 size_t i;
605 uint32_t sum = 0;
606 for (i = 0; i < size; i += 4) {
607 sum += memory[i >> 2];
608 }
609 return sum;
610}
611
612static void _unLz77(struct GBA* gba, int width) {
613 struct ARMCore* cpu = gba->cpu;
614 uint32_t source = cpu->gprs[0];
615 uint32_t dest = cpu->gprs[1];
616 int remaining = (cpu->memory.load32(cpu, source, 0) & 0xFFFFFF00) >> 8;
617 // We assume the signature byte (0x10) is correct
618 int blockheader = 0; // Some compilers warn if this isn't set, even though it's trivially provably always set
619 source += 4;
620 int blocksRemaining = 0;
621 uint32_t disp;
622 int bytes;
623 int byte;
624 int halfword = 0;
625 while (remaining > 0) {
626 if (blocksRemaining) {
627 if (blockheader & 0x80) {
628 // Compressed
629 int block = cpu->memory.load8(cpu, source + 1, 0) | (cpu->memory.load8(cpu, source, 0) << 8);
630 source += 2;
631 disp = dest - (block & 0x0FFF) - 1;
632 bytes = (block >> 12) + 3;
633 while (bytes--) {
634 if (remaining) {
635 --remaining;
636 }
637 if (width == 2) {
638 byte = (int16_t) cpu->memory.load16(cpu, disp & ~1, 0);
639 if (dest & 1) {
640 byte >>= (disp & 1) * 8;
641 halfword |= byte << 8;
642 cpu->memory.store16(cpu, dest ^ 1, halfword, 0);
643 } else {
644 byte >>= (disp & 1) * 8;
645 halfword = byte & 0xFF;
646 }
647 } else {
648 byte = cpu->memory.load8(cpu, disp, 0);
649 cpu->memory.store8(cpu, dest, byte, 0);
650 }
651 ++disp;
652 ++dest;
653 }
654 } else {
655 // Uncompressed
656 byte = cpu->memory.load8(cpu, source, 0);
657 ++source;
658 if (width == 2) {
659 if (dest & 1) {
660 halfword |= byte << 8;
661 cpu->memory.store16(cpu, dest ^ 1, halfword, 0);
662 } else {
663 halfword = byte;
664 }
665 } else {
666 cpu->memory.store8(cpu, dest, byte, 0);
667 }
668 ++dest;
669 --remaining;
670 }
671 blockheader <<= 1;
672 --blocksRemaining;
673 } else {
674 blockheader = cpu->memory.load8(cpu, source, 0);
675 ++source;
676 blocksRemaining = 8;
677 }
678 }
679 cpu->gprs[0] = source;
680 cpu->gprs[1] = dest;
681 cpu->gprs[3] = 0;
682}
683
684DECL_BITFIELD(HuffmanNode, uint8_t);
685DECL_BITS(HuffmanNode, Offset, 0, 6);
686DECL_BIT(HuffmanNode, RTerm, 6);
687DECL_BIT(HuffmanNode, LTerm, 7);
688
689static void _unHuffman(struct GBA* gba) {
690 struct ARMCore* cpu = gba->cpu;
691 uint32_t source = cpu->gprs[0] & 0xFFFFFFFC;
692 uint32_t dest = cpu->gprs[1];
693 uint32_t header = cpu->memory.load32(cpu, source, 0);
694 int remaining = header >> 8;
695 unsigned bits = header & 0xF;
696 if (bits == 0) {
697 mLOG(GBA_BIOS, GAME_ERROR, "Invalid Huffman bits");
698 bits = 8;
699 }
700 if (32 % bits || bits == 1) {
701 mLOG(GBA_BIOS, STUB, "Unimplemented unaligned Huffman");
702 return;
703 }
704 // We assume the signature byte (0x20) is correct
705 int treesize = (cpu->memory.load8(cpu, source + 4, 0) << 1) + 1;
706 int block = 0;
707 uint32_t treeBase = source + 5;
708 source += 5 + treesize;
709 uint32_t nPointer = treeBase;
710 HuffmanNode node;
711 int bitsRemaining;
712 int readBits;
713 int bitsSeen = 0;
714 node = cpu->memory.load8(cpu, nPointer, 0);
715 while (remaining > 0) {
716 uint32_t bitstream = cpu->memory.load32(cpu, source, 0);
717 source += 4;
718 for (bitsRemaining = 32; bitsRemaining > 0 && remaining > 0; --bitsRemaining, bitstream <<= 1) {
719 uint32_t next = (nPointer & ~1) + HuffmanNodeGetOffset(node) * 2 + 2;
720 if (bitstream & 0x80000000) {
721 // Go right
722 if (HuffmanNodeIsRTerm(node)) {
723 readBits = cpu->memory.load8(cpu, next + 1, 0);
724 } else {
725 nPointer = next + 1;
726 node = cpu->memory.load8(cpu, nPointer, 0);
727 continue;
728 }
729 } else {
730 // Go left
731 if (HuffmanNodeIsLTerm(node)) {
732 readBits = cpu->memory.load8(cpu, next, 0);
733 } else {
734 nPointer = next;
735 node = cpu->memory.load8(cpu, nPointer, 0);
736 continue;
737 }
738 }
739
740 block |= (readBits & ((1 << bits) - 1)) << bitsSeen;
741 bitsSeen += bits;
742 nPointer = treeBase;
743 node = cpu->memory.load8(cpu, nPointer, 0);
744 if (bitsSeen == 32) {
745 bitsSeen = 0;
746 cpu->memory.store32(cpu, dest, block, 0);
747 dest += 4;
748 remaining -= 4;
749 block = 0;
750 }
751 }
752 }
753 cpu->gprs[0] = source;
754 cpu->gprs[1] = dest;
755}
756
757static void _unRl(struct GBA* gba, int width) {
758 struct ARMCore* cpu = gba->cpu;
759 uint32_t source = cpu->gprs[0];
760 int remaining = (cpu->memory.load32(cpu, source & 0xFFFFFFFC, 0) & 0xFFFFFF00) >> 8;
761 int padding = (4 - remaining) & 0x3;
762 // We assume the signature byte (0x30) is correct
763 int blockheader;
764 int block;
765 source += 4;
766 uint32_t dest = cpu->gprs[1];
767 int halfword = 0;
768 while (remaining > 0) {
769 blockheader = cpu->memory.load8(cpu, source, 0);
770 ++source;
771 if (blockheader & 0x80) {
772 // Compressed
773 blockheader &= 0x7F;
774 blockheader += 3;
775 block = cpu->memory.load8(cpu, source, 0);
776 ++source;
777 while (blockheader-- && remaining) {
778 --remaining;
779 if (width == 2) {
780 if (dest & 1) {
781 halfword |= block << 8;
782 cpu->memory.store16(cpu, dest ^ 1, halfword, 0);
783 } else {
784 halfword = block;
785 }
786 } else {
787 cpu->memory.store8(cpu, dest, block, 0);
788 }
789 ++dest;
790 }
791 } else {
792 // Uncompressed
793 blockheader++;
794 while (blockheader-- && remaining) {
795 --remaining;
796 int byte = cpu->memory.load8(cpu, source, 0);
797 ++source;
798 if (width == 2) {
799 if (dest & 1) {
800 halfword |= byte << 8;
801 cpu->memory.store16(cpu, dest ^ 1, halfword, 0);
802 } else {
803 halfword = byte;
804 }
805 } else {
806 cpu->memory.store8(cpu, dest, byte, 0);
807 }
808 ++dest;
809 }
810 }
811 }
812 if (width == 2) {
813 if (dest & 1) {
814 --padding;
815 ++dest;
816 }
817 for (; padding > 0; padding -= 2, dest += 2) {
818 cpu->memory.store16(cpu, dest, 0, 0);
819 }
820 } else {
821 while (padding--) {
822 cpu->memory.store8(cpu, dest, 0, 0);
823 ++dest;
824 }
825 }
826 cpu->gprs[0] = source;
827 cpu->gprs[1] = dest;
828}
829
830static void _unFilter(struct GBA* gba, int inwidth, int outwidth) {
831 struct ARMCore* cpu = gba->cpu;
832 uint32_t source = cpu->gprs[0] & 0xFFFFFFFC;
833 uint32_t dest = cpu->gprs[1];
834 uint32_t header = cpu->memory.load32(cpu, source, 0);
835 int remaining = header >> 8;
836 // We assume the signature nybble (0x8) is correct
837 uint16_t halfword = 0;
838 uint16_t old = 0;
839 source += 4;
840 while (remaining > 0) {
841 uint16_t new;
842 if (inwidth == 1) {
843 new = cpu->memory.load8(cpu, source, 0);
844 } else {
845 new = cpu->memory.load16(cpu, source, 0);
846 }
847 new += old;
848 if (outwidth > inwidth) {
849 halfword >>= 8;
850 halfword |= (new << 8);
851 if (source & 1) {
852 cpu->memory.store16(cpu, dest, halfword, 0);
853 dest += outwidth;
854 remaining -= outwidth;
855 }
856 } else if (outwidth == 1) {
857 cpu->memory.store8(cpu, dest, new, 0);
858 dest += outwidth;
859 remaining -= outwidth;
860 } else {
861 cpu->memory.store16(cpu, dest, new, 0);
862 dest += outwidth;
863 remaining -= outwidth;
864 }
865 old = new;
866 source += inwidth;
867 }
868 cpu->gprs[0] = source;
869 cpu->gprs[1] = dest;
870}
871
872static void _unBitPack(struct GBA* gba) {
873 struct ARMCore* cpu = gba->cpu;
874 uint32_t source = cpu->gprs[0];
875 uint32_t dest = cpu->gprs[1];
876 uint32_t info = cpu->gprs[2];
877 unsigned sourceLen = cpu->memory.load16(cpu, info, 0);
878 unsigned sourceWidth = cpu->memory.load8(cpu, info + 2, 0);
879 unsigned destWidth = cpu->memory.load8(cpu, info + 3, 0);
880 switch (sourceWidth) {
881 case 1:
882 case 2:
883 case 4:
884 case 8:
885 break;
886 default:
887 mLOG(GBA_BIOS, GAME_ERROR, "Bad BitUnPack source width: %u", sourceWidth);
888 return;
889 }
890 switch (destWidth) {
891 case 1:
892 case 2:
893 case 4:
894 case 8:
895 case 16:
896 case 32:
897 break;
898 default:
899 mLOG(GBA_BIOS, GAME_ERROR, "Bad BitUnPack destination width: %u", destWidth);
900 return;
901 }
902 uint32_t bias = cpu->memory.load32(cpu, info + 4, 0);
903 uint8_t in = 0;
904 uint32_t out = 0;
905 int bitsRemaining = 0;
906 int bitsEaten = 0;
907 while (sourceLen > 0 || bitsRemaining) {
908 if (!bitsRemaining) {
909 in = cpu->memory.load8(cpu, source, 0);
910 bitsRemaining = 8;
911 ++source;
912 --sourceLen;
913 }
914 unsigned scaled = in & ((1 << sourceWidth) - 1);
915 in >>= sourceWidth;
916 if (scaled || bias & 0x80000000) {
917 scaled += bias & 0x7FFFFFFF;
918 }
919 bitsRemaining -= sourceWidth;
920 out |= scaled << bitsEaten;
921 bitsEaten += destWidth;
922 if (bitsEaten == 32) {
923 cpu->memory.store32(cpu, dest, out, 0);
924 bitsEaten = 0;
925 out = 0;
926 dest += 4;
927 }
928 }
929 cpu->gprs[0] = source;
930 cpu->gprs[1] = dest;
931}