src/gba/cheats/parv3.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/cheats.h>
7
8#include "gba/cheats/gameshark.h"
9#include <mgba/internal/gba/gba.h>
10#include <mgba-util/string.h>
11
12const uint32_t GBACheatProActionReplaySeeds[4] = { 0x7AA9648F, 0x7FAE6994, 0xC0EFAAD5, 0x42712C57 };
13
14static const uint8_t _par3T1[256] = {
15 0xD0, 0xFF, 0xBA, 0xE5, 0xC1, 0xC7, 0xDB, 0x5B, 0x16, 0xE3, 0x6E, 0x26, 0x62, 0x31, 0x2E, 0x2A,
16 0xD1, 0xBB, 0x4A, 0xE6, 0xAE, 0x2F, 0x0A, 0x90, 0x29, 0x90, 0xB6, 0x67, 0x58, 0x2A, 0xB4, 0x45,
17 0x7B, 0xCB, 0xF0, 0x73, 0x84, 0x30, 0x81, 0xC2, 0xD7, 0xBE, 0x89, 0xD7, 0x4E, 0x73, 0x5C, 0xC7,
18 0x80, 0x1B, 0xE5, 0xE4, 0x43, 0xC7, 0x46, 0xD6, 0x6F, 0x7B, 0xBF, 0xED, 0xE5, 0x27, 0xD1, 0xB5,
19 0xD0, 0xD8, 0xA3, 0xCB, 0x2B, 0x30, 0xA4, 0xF0, 0x84, 0x14, 0x72, 0x5C, 0xFF, 0xA4, 0xFB, 0x54,
20 0x9D, 0x70, 0xE2, 0xFF, 0xBE, 0xE8, 0x24, 0x76, 0xE5, 0x15, 0xFB, 0x1A, 0xBC, 0x87, 0x02, 0x2A,
21 0x58, 0x8F, 0x9A, 0x95, 0xBD, 0xAE, 0x8D, 0x0C, 0xA5, 0x4C, 0xF2, 0x5C, 0x7D, 0xAD, 0x51, 0xFB,
22 0xB1, 0x22, 0x07, 0xE0, 0x29, 0x7C, 0xEB, 0x98, 0x14, 0xC6, 0x31, 0x97, 0xE4, 0x34, 0x8F, 0xCC,
23 0x99, 0x56, 0x9F, 0x78, 0x43, 0x91, 0x85, 0x3F, 0xC2, 0xD0, 0xD1, 0x80, 0xD1, 0x77, 0xA7, 0xE2,
24 0x43, 0x99, 0x1D, 0x2F, 0x8B, 0x6A, 0xE4, 0x66, 0x82, 0xF7, 0x2B, 0x0B, 0x65, 0x14, 0xC0, 0xC2,
25 0x1D, 0x96, 0x78, 0x1C, 0xC4, 0xC3, 0xD2, 0xB1, 0x64, 0x07, 0xD7, 0x6F, 0x02, 0xE9, 0x44, 0x31,
26 0xDB, 0x3C, 0xEB, 0x93, 0xED, 0x9A, 0x57, 0x05, 0xB9, 0x0E, 0xAF, 0x1F, 0x48, 0x11, 0xDC, 0x35,
27 0x6C, 0xB8, 0xEE, 0x2A, 0x48, 0x2B, 0xBC, 0x89, 0x12, 0x59, 0xCB, 0xD1, 0x18, 0xEA, 0x72, 0x11,
28 0x01, 0x75, 0x3B, 0xB5, 0x56, 0xF4, 0x8B, 0xA0, 0x41, 0x75, 0x86, 0x7B, 0x94, 0x12, 0x2D, 0x4C,
29 0x0C, 0x22, 0xC9, 0x4A, 0xD8, 0xB1, 0x8D, 0xF0, 0x55, 0x2E, 0x77, 0x50, 0x1C, 0x64, 0x77, 0xAA,
30 0x3E, 0xAC, 0xD3, 0x3D, 0xCE, 0x60, 0xCA, 0x5D, 0xA0, 0x92, 0x78, 0xC6, 0x51, 0xFE, 0xF9, 0x30
31};
32
33static const uint8_t _par3T2[256] = {
34 0xAA, 0xAF, 0xF0, 0x72, 0x90, 0xF7, 0x71, 0x27, 0x06, 0x11, 0xEB, 0x9C, 0x37, 0x12, 0x72, 0xAA,
35 0x65, 0xBC, 0x0D, 0x4A, 0x76, 0xF6, 0x5C, 0xAA, 0xB0, 0x7A, 0x7D, 0x81, 0xC1, 0xCE, 0x2F, 0x9F,
36 0x02, 0x75, 0x38, 0xC8, 0xFC, 0x66, 0x05, 0xC2, 0x2C, 0xBD, 0x91, 0xAD, 0x03, 0xB1, 0x88, 0x93,
37 0x31, 0xC6, 0xAB, 0x40, 0x23, 0x43, 0x76, 0x54, 0xCA, 0xE7, 0x00, 0x96, 0x9F, 0xD8, 0x24, 0x8B,
38 0xE4, 0xDC, 0xDE, 0x48, 0x2C, 0xCB, 0xF7, 0x84, 0x1D, 0x45, 0xE5, 0xF1, 0x75, 0xA0, 0xED, 0xCD,
39 0x4B, 0x24, 0x8A, 0xB3, 0x98, 0x7B, 0x12, 0xB8, 0xF5, 0x63, 0x97, 0xB3, 0xA6, 0xA6, 0x0B, 0xDC,
40 0xD8, 0x4C, 0xA8, 0x99, 0x27, 0x0F, 0x8F, 0x94, 0x63, 0x0F, 0xB0, 0x11, 0x94, 0xC7, 0xE9, 0x7F,
41 0x3B, 0x40, 0x72, 0x4C, 0xDB, 0x84, 0x78, 0xFE, 0xB8, 0x56, 0x08, 0x80, 0xDF, 0x20, 0x2F, 0xB9,
42 0x66, 0x2D, 0x60, 0x63, 0xF5, 0x18, 0x15, 0x1B, 0x86, 0x85, 0xB9, 0xB4, 0x68, 0x0E, 0xC6, 0xD1,
43 0x8A, 0x81, 0x2B, 0xB3, 0xF6, 0x48, 0xF0, 0x4F, 0x9C, 0x28, 0x1C, 0xA4, 0x51, 0x2F, 0xD7, 0x4B,
44 0x17, 0xE7, 0xCC, 0x50, 0x9F, 0xD0, 0xD1, 0x40, 0x0C, 0x0D, 0xCA, 0x83, 0xFA, 0x5E, 0xCA, 0xEC,
45 0xBF, 0x4E, 0x7C, 0x8F, 0xF0, 0xAE, 0xC2, 0xD3, 0x28, 0x41, 0x9B, 0xC8, 0x04, 0xB9, 0x4A, 0xBA,
46 0x72, 0xE2, 0xB5, 0x06, 0x2C, 0x1E, 0x0B, 0x2C, 0x7F, 0x11, 0xA9, 0x26, 0x51, 0x9D, 0x3F, 0xF8,
47 0x62, 0x11, 0x2E, 0x89, 0xD2, 0x9D, 0x35, 0xB1, 0xE4, 0x0A, 0x4D, 0x93, 0x01, 0xA7, 0xD1, 0x2D,
48 0x00, 0x87, 0xE2, 0x2D, 0xA4, 0xE9, 0x0A, 0x06, 0x66, 0xF8, 0x1F, 0x44, 0x75, 0xB5, 0x6B, 0x1C,
49 0xFC, 0x31, 0x09, 0x48, 0xA3, 0xFF, 0x92, 0x12, 0x58, 0xE9, 0xFA, 0xAE, 0x4F, 0xE2, 0xB4, 0xCC
50};
51static uint32_t _parAddr(uint32_t x) {
52 return (x & 0xFFFFF) | ((x << 4) & 0x0F000000);
53}
54
55static void _parEndBlock(struct GBACheatSet* cheats) {
56 size_t size = mCheatListSize(&cheats->d.list) - cheats->currentBlock - 1;
57 struct mCheat* currentBlock = mCheatListGetPointer(&cheats->d.list, cheats->currentBlock);
58 if (currentBlock->repeat) {
59 currentBlock->negativeRepeat = size - currentBlock->repeat;
60 } else {
61 currentBlock->repeat = size;
62 }
63 cheats->currentBlock = COMPLETE;
64}
65
66static void _parElseBlock(struct GBACheatSet* cheats) {
67 size_t size = mCheatListSize(&cheats->d.list) - cheats->currentBlock - 1;
68 struct mCheat* currentBlock = mCheatListGetPointer(&cheats->d.list, cheats->currentBlock);
69 currentBlock->repeat = size;
70}
71
72static bool _addPAR3Cond(struct GBACheatSet* cheats, uint32_t op1, uint32_t op2) {
73 enum GBAActionReplay3Condition condition = op1 & PAR3_COND;
74 int width = 1 << ((op1 & PAR3_WIDTH) >> PAR3_WIDTH_BASE);
75 if (width > 4) {
76 // TODO: Always false conditions
77 return false;
78 }
79 if ((op1 & PAR3_ACTION) == PAR3_ACTION_DISABLE) {
80 // TODO: Codes that disable
81 return false;
82 }
83
84 struct mCheat* cheat = mCheatListAppend(&cheats->d.list);
85 cheat->address = _parAddr(op1);
86 cheat->width = width;
87 cheat->operand = op2 & (0xFFFFFFFFU >> ((4 - width) * 8));
88 cheat->addressOffset = 0;
89 cheat->operandOffset = 0;
90
91 switch (op1 & PAR3_ACTION) {
92 case PAR3_ACTION_NEXT:
93 cheat->repeat = 1;
94 cheat->negativeRepeat = 0;
95 break;
96 case PAR3_ACTION_NEXT_TWO:
97 cheat->repeat = 2;
98 cheat->negativeRepeat = 0;
99 break;
100 case PAR3_ACTION_BLOCK:
101 cheat->repeat = 0;
102 cheat->negativeRepeat = 0;
103 if (cheats->currentBlock != COMPLETE) {
104 _parEndBlock(cheats);
105 }
106 cheats->currentBlock = mCheatListIndex(&cheats->d.list, cheat);
107 break;
108 }
109
110 switch (condition) {
111 case PAR3_COND_OTHER:
112 // We shouldn't be able to get here
113 mLOG(CHEATS, ERROR, "Unexpectedly created 'other' PARv3 code");
114 cheat->type = CHEAT_IF_LAND;
115 cheat->operand = 0;
116 break;
117 case PAR3_COND_EQ:
118 cheat->type = CHEAT_IF_EQ;
119 break;
120 case PAR3_COND_NE:
121 cheat->type = CHEAT_IF_NE;
122 break;
123 case PAR3_COND_LT:
124 cheat->type = CHEAT_IF_LT;
125 break;
126 case PAR3_COND_GT:
127 cheat->type = CHEAT_IF_GT;
128 break;
129 case PAR3_COND_ULT:
130 cheat->type = CHEAT_IF_ULT;
131 break;
132 case PAR3_COND_UGT:
133 cheat->type = CHEAT_IF_UGT;
134 break;
135 case PAR3_COND_AND:
136 cheat->type = CHEAT_IF_AND;
137 break;
138 }
139 return true;
140}
141
142static bool _addPAR3Special(struct GBACheatSet* cheats, uint32_t op2) {
143 struct mCheat* cheat;
144 switch (op2 & 0xFF000000) {
145 case PAR3_OTHER_SLOWDOWN:
146 // TODO: Slowdown
147 return false;
148 case PAR3_OTHER_BUTTON_1:
149 case PAR3_OTHER_BUTTON_2:
150 case PAR3_OTHER_BUTTON_4:
151 // TODO: Button
152 mLOG(CHEATS, STUB, "GameShark button unimplemented");
153 return false;
154 // TODO: Fix overriding existing patches
155 case PAR3_OTHER_PATCH_1:
156 cheats->romPatches[0].address = BASE_CART0 | ((op2 & 0xFFFFFF) << 1);
157 cheats->romPatches[0].applied = false;
158 cheats->romPatches[0].exists = true;
159 cheats->incompletePatch = &cheats->romPatches[0];
160 break;
161 case PAR3_OTHER_PATCH_2:
162 cheats->romPatches[1].address = BASE_CART0 | ((op2 & 0xFFFFFF) << 1);
163 cheats->romPatches[1].applied = false;
164 cheats->romPatches[1].exists = true;
165 cheats->incompletePatch = &cheats->romPatches[1];
166 break;
167 case PAR3_OTHER_PATCH_3:
168 cheats->romPatches[2].address = BASE_CART0 | ((op2 & 0xFFFFFF) << 1);
169 cheats->romPatches[2].applied = false;
170 cheats->romPatches[2].exists = true;
171 cheats->incompletePatch = &cheats->romPatches[2];
172 break;
173 case PAR3_OTHER_PATCH_4:
174 cheats->romPatches[3].address = BASE_CART0 | ((op2 & 0xFFFFFF) << 1);
175 cheats->romPatches[3].applied = false;
176 cheats->romPatches[3].exists = true;
177 cheats->incompletePatch = &cheats->romPatches[3];
178 break;
179 case PAR3_OTHER_ENDIF:
180 if (cheats->currentBlock != COMPLETE) {
181 _parEndBlock(cheats);
182 return true;
183 }
184 return false;
185 case PAR3_OTHER_ELSE:
186 if (cheats->currentBlock != COMPLETE) {
187 _parElseBlock(cheats);
188 return true;
189 }
190 return false;
191 case PAR3_OTHER_FILL_1:
192 cheat = mCheatListAppend(&cheats->d.list);
193 cheat->type = CHEAT_ASSIGN;
194 cheat->address = _parAddr(op2);
195 cheat->width = 1;
196 cheats->incompleteCheat = mCheatListIndex(&cheats->d.list, cheat);
197 break;
198 case PAR3_OTHER_FILL_2:
199 cheat = mCheatListAppend(&cheats->d.list);
200 cheat->type = CHEAT_ASSIGN;
201 cheat->address = _parAddr(op2);
202 cheat->width = 2;
203 cheats->incompleteCheat = mCheatListIndex(&cheats->d.list, cheat);
204 break;
205 case PAR3_OTHER_FILL_4:
206 cheat = mCheatListAppend(&cheats->d.list);
207 cheat->type = CHEAT_ASSIGN;
208 cheat->address = _parAddr(op2);
209 cheat->width = 4;
210 cheats->incompleteCheat = mCheatListIndex(&cheats->d.list, cheat);
211 break;
212 }
213 return true;
214}
215
216bool GBACheatAddProActionReplayRaw(struct GBACheatSet* cheats, uint32_t op1, uint32_t op2) {
217 if (cheats->incompletePatch) {
218 cheats->incompletePatch->newValue = op1;
219 cheats->incompletePatch = 0;
220 return true;
221 }
222 if (cheats->incompleteCheat != COMPLETE) {
223 struct mCheat* incompleteCheat = mCheatListGetPointer(&cheats->d.list, cheats->incompleteCheat);
224 incompleteCheat->operand = op1 & (0xFFFFFFFFU >> ((4 - incompleteCheat->width) * 8));
225 incompleteCheat->operandOffset = op2 >> 24;
226 incompleteCheat->repeat = (op2 >> 16) & 0xFF;
227 incompleteCheat->addressOffset = (op2 & 0xFFFF) * incompleteCheat->width;
228 cheats->incompleteCheat = COMPLETE;
229 return true;
230 }
231
232 if (op2 == 0x001DC0DE) {
233 return true;
234 }
235
236 switch (op1) {
237 case 0x00000000:
238 return _addPAR3Special(cheats, op2);
239 case 0xDEADFACE:
240 GBACheatReseedGameShark(cheats->gsaSeeds, op2, _par3T1, _par3T2);
241 return true;
242 }
243
244 if (op1 >> 24 == 0xC4) {
245 if (cheats->hook) {
246 return false;
247 }
248 cheats->hook = malloc(sizeof(*cheats->hook));
249 cheats->hook->address = BASE_CART0 | (op1 & (SIZE_CART0 - 1));
250 cheats->hook->mode = MODE_THUMB;
251 cheats->hook->refs = 1;
252 cheats->hook->reentries = 0;
253 return true;
254 }
255
256 if (op1 & PAR3_COND) {
257 return _addPAR3Cond(cheats, op1, op2);
258 }
259
260 int width = 1 << ((op1 & PAR3_WIDTH) >> PAR3_WIDTH_BASE);
261 struct mCheat* cheat = mCheatListAppend(&cheats->d.list);
262 cheat->address = _parAddr(op1);
263 cheat->operandOffset = 0;
264 cheat->addressOffset = 0;
265 cheat->repeat = 1;
266
267 switch (op1 & PAR3_BASE) {
268 case PAR3_BASE_ASSIGN:
269 cheat->type = CHEAT_ASSIGN;
270 cheat->addressOffset = width;
271 if (width < 4) {
272 cheat->repeat = (op2 >> (width * 8)) + 1;
273 }
274 break;
275 case PAR3_BASE_INDIRECT:
276 cheat->type = CHEAT_ASSIGN_INDIRECT;
277 if (width < 4) {
278 cheat->addressOffset = (op2 >> (width * 8)) * width;
279 }
280 break;
281 case PAR3_BASE_ADD:
282 cheat->type = CHEAT_ADD;
283 break;
284 case PAR3_BASE_OTHER:
285 width = ((op1 >> 24) & 1) + 1;
286 cheat->type = CHEAT_ASSIGN;
287 cheat->address = BASE_IO | (op1 & OFFSET_MASK);
288 break;
289 }
290 if (op1 & 0x01000000 && (op1 & 0xFE000000) != 0xC6000000) {
291 return false;
292 }
293
294
295 cheat->width = width;
296 cheat->operand = op2 & (0xFFFFFFFFU >> ((4 - width) * 8));
297 return true;
298}
299
300bool GBACheatAddProActionReplay(struct GBACheatSet* set, uint32_t op1, uint32_t op2) {
301 uint32_t o1 = op1;
302 uint32_t o2 = op2;
303 char line[18] = "XXXXXXXX XXXXXXXX";
304 snprintf(line, sizeof(line), "%08X %08X", op1, op2);
305
306 switch (set->gsaVersion) {
307 default:
308 GBACheatSetGameSharkVersion(set, GBA_GS_PARV3);
309 // Fall through
310 case GBA_GS_PARV3:
311 GBACheatDecryptGameShark(&o1, &o2, set->gsaSeeds);
312 // Fall through
313 case GBA_GS_PARV3_RAW:
314 return GBACheatAddProActionReplayRaw(set, o1, o2);
315 }
316 return false;
317}
318
319bool GBACheatAddProActionReplayLine(struct GBACheatSet* cheats, const char* line) {
320 uint32_t op1;
321 uint32_t op2;
322 line = hex32(line, &op1);
323 if (!line) {
324 return false;
325 }
326 while (*line == ' ') {
327 ++line;
328 }
329 line = hex32(line, &op2);
330 if (!line) {
331 return false;
332 }
333 return GBACheatAddProActionReplay(cheats, op1, op2);
334}
335
336int GBACheatProActionReplayProbability(uint32_t op1, uint32_t op2) {
337 int probability = 0;
338 if (op2 == 0x001DC0DE) {
339 return 0x100;
340 }
341 if (op1 == 0xDEADFACE && !(op2 & 0xFFFF0000)) {
342 return 0x100;
343 }
344 if (!op1) {
345 probability += 0x20;
346 uint32_t address = _parAddr(op2);
347 switch (op2 & 0xFE000000) {
348 case PAR3_OTHER_FILL_1:
349 case PAR3_OTHER_FILL_2:
350 case PAR3_OTHER_FILL_4:
351 probability += GBACheatAddressIsReal(address);
352 break;
353 case PAR3_OTHER_PATCH_1:
354 case PAR3_OTHER_PATCH_2:
355 case PAR3_OTHER_PATCH_3:
356 case PAR3_OTHER_PATCH_4:
357 // TODO: Detect ROM address
358 break;
359 case PAR3_OTHER_END:
360 case PAR3_OTHER_SLOWDOWN:
361 case PAR3_OTHER_BUTTON_1:
362 case PAR3_OTHER_BUTTON_2:
363 case PAR3_OTHER_BUTTON_4:
364 case PAR3_OTHER_ENDIF:
365 case PAR3_OTHER_ELSE:
366 if (op2 & 0x01FFFFFF) {
367 probability -= 0x20;
368 }
369 break;
370 default:
371 probability -= 0x40;
372 break;
373 }
374 return probability;
375 }
376 int width = ((op1 & PAR3_WIDTH) >> (PAR3_WIDTH_BASE - 3));
377 if (op1 & PAR3_COND) {
378 probability += 0x20;
379 if (width >= 24) {
380 return 0;
381 }
382 if (op2 & ~((1 << width) - 1)) {
383 probability -= 0x10;
384 }
385 } else {
386 uint32_t address = _parAddr(op1);
387 probability += 0x20;
388 switch (op1 & PAR3_BASE) {
389 case PAR3_BASE_ADD:
390 if (op2 & ~((1 << width) - 1)) {
391 probability -= 0x10;
392 }
393 // Fall through
394 case PAR3_BASE_ASSIGN:
395 case PAR3_BASE_INDIRECT:
396 probability += GBACheatAddressIsReal(address);
397 if (op1 & 0x01000000) {
398 return 0;
399 }
400 break;
401 case PAR3_BASE_OTHER:
402 break;
403 }
404 }
405 return probability;
406}