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