| 1 | /*␊ |
| 2 | * Copyright 2010 Evan Lojewski. All rights reserved.␊ |
| 3 | *␊ |
| 4 | */␊ |
| 5 | #include "boot.h"␊ |
| 6 | #include "bootstruct.h"␊ |
| 7 | #include "modules.h"␊ |
| 8 | #include "boot_modules.h"␊ |
| 9 | #include "mboot.h"␊ |
| 10 | #include <vers.h>␊ |
| 11 | ␊ |
| 12 | #include <string.h>␊ |
| 13 | ␊ |
| 14 | #ifdef CONFIG_MODULES␊ |
| 15 | #ifndef CONFIG_MODULE_DEBUG␊ |
| 16 | #define CONFIG_MODULE_DEBUG 0␊ |
| 17 | #endif␊ |
| 18 | ␊ |
| 19 | ␊ |
| 20 | #if CONFIG_MODULE_DEBUG␊ |
| 21 | #define DBG(x...)␉printf(x)␊ |
| 22 | #define DBGPAUSE()␉getchar()␊ |
| 23 | #else␊ |
| 24 | #define DBG(x...)␊ |
| 25 | #define DBGPAUSE()␊ |
| 26 | #endif␊ |
| 27 | ␊ |
| 28 | static inline void␉␉rebase_location(UInt32* location, char* base, int type);␊ |
| 29 | static inline void␉␉bind_location(UInt32* location, char* value, UInt32 addend, int type);␊ |
| 30 | ␊ |
| 31 | // NOTE: Global so that modules can link with this␊ |
| 32 | static UInt64 textAddress = 0;␊ |
| 33 | static UInt64 textSection = 0;␊ |
| 34 | ␊ |
| 35 | /** Internal symbols, however there are accessor methods **/␊ |
| 36 | moduleHook_t* moduleCallbacks = NULL;␊ |
| 37 | moduleList_t* loadedModules = NULL;␊ |
| 38 | symbolList_t* moduleSymbols = NULL;␊ |
| 39 | unsigned int (*lookup_symbol)(const char*) = NULL;␊ |
| 40 | ␊ |
| 41 | char *strrchr(const char *s, int c)␊ |
| 42 | {␊ |
| 43 | ␉const char *found = NULL;␊ |
| 44 | ␊ |
| 45 | ␉while (*s) {␊ |
| 46 | ␉␉if (*s == (char)c)␊ |
| 47 | ␉␉{␊ |
| 48 | ␉␉␉found = s;␊ |
| 49 | ␉␉}␊ |
| 50 | ␉␉s++;␊ |
| 51 | ␉}␊ |
| 52 | ␊ |
| 53 | ␉return (char *)found;␊ |
| 54 | }␊ |
| 55 | ␊ |
| 56 | /*␊ |
| 57 | * Initialize the module system by loading the Symbols.dylib module.␊ |
| 58 | * Once loaded, locate the _lookup_symbol function so that internal␊ |
| 59 | * symbols can be resolved.␊ |
| 60 | */␊ |
| 61 | int init_module_system()␊ |
| 62 | {␊ |
| 63 | ␉// Start any modules that were compiled in first.␊ |
| 64 | ␉start_built_in_modules();␊ |
| 65 | ␊ |
| 66 | ␊ |
| 67 | ␉int retVal = 0;␊ |
| 68 | ␉void (*module_start)(void) = NULL;␊ |
| 69 | ␊ |
| 70 | ␉extern char symbols_start __asm("section$start$__DATA$__Symbols");␊ |
| 71 | ␉char* module_data = &symbols_start;␊ |
| 72 | ␊ |
| 73 | ␉// Intialize module system␊ |
| 74 | ␉if(module_data)␊ |
| 75 | ␉{␊ |
| 76 | ␉␉// Module system was compiled in (Symbols.dylib addr known)␊ |
| 77 | ␉␉module_start = parse_mach(module_data, &load_module, &add_symbol, NULL);␊ |
| 78 | ␊ |
| 79 | ␉␉if(module_start && module_start != (void*)0xFFFFFFFF)␊ |
| 80 | ␉␉{␊ |
| 81 | ␉␉␉// Notify the system that it was laoded␊ |
| 82 | ␉␉␉module_loaded(SYMBOLS_MODULE, module_start, SYMBOLS_AUTHOR, SYMBOLS_DESCRIPTION, SYMBOLS_VERSION, SYMBOLS_COMPAT);␊ |
| 83 | ␉␉␉(*module_start)();␉// Start the module. This will point to load_all_modules due to the way the dylib was constructed.␊ |
| 84 | ␉␉␉DBG("Module %s Loaded.\n", SYMBOLS_MODULE);␊ |
| 85 | ␉␉␉retVal = 1;␊ |
| 86 | ␊ |
| 87 | ␉␉}␊ |
| 88 | ␉␉else␊ |
| 89 | ␉␉{␊ |
| 90 | ␉␉␉// The module does not have a valid start function␊ |
| 91 | ␉␉␉printf("Unable to start %s at 0x%x\n", SYMBOLS_MODULE, module_data); pause();␊ |
| 92 | ␉␉}␊ |
| 93 | ␉}␊ |
| 94 | ␊ |
| 95 | ␉// Look for modules located in the multiboot header.␊ |
| 96 | ␉if(gMI && (gMI->mi_flags & MULTIBOOT_INFO_HAS_MODS))␊ |
| 97 | ␉{␊ |
| 98 | ␉␉if(gMI->mi_mods_count)␊ |
| 99 | ␉␉{␊ |
| 100 | ␉␉␉struct multiboot_module* mod = (struct multiboot_module*)gMI->mi_mods_addr;␊ |
| 101 | ␉␉␉while(gMI->mi_mods_count--)␊ |
| 102 | ␉␉␉{␊ |
| 103 | ␉␉␉␉if(mod->mm_string)␊ |
| 104 | ␉␉␉␉{␊ |
| 105 | ␉␉␉␉␉// Convert string to module name, check for dylib.␊ |
| 106 | ␉␉␉␉␉if(strcmp(&mod->mm_string[strlen(mod->mm_string) - sizeof("dylib")], ".dylib") == 0)␊ |
| 107 | ␉␉␉␉␉{␊ |
| 108 | ␉␉␉␉␉␉module_data = (char*)mod->mm_mod_start;␊ |
| 109 | ␊ |
| 110 | ␉␉␉␉␉␉char* last = strrchr(mod->mm_string, '/');␊ |
| 111 | ␉␉␉␉␉␉if(last)␊ |
| 112 | ␉␉␉␉␉␉{␊ |
| 113 | ␉␉␉␉␉␉␉last++;␊ |
| 114 | ␉␉␉␉␉␉}␊ |
| 115 | ␉␉␉␉␉␉else␊ |
| 116 | ␉␉␉␉␉␉{␊ |
| 117 | ␉␉␉␉␉␉␉last = mod->mm_string;␊ |
| 118 | ␉␉␉␉␉␉}␊ |
| 119 | ␊ |
| 120 | ␉␉␉␉␉␉char* name = strdup(last);␊ |
| 121 | ␉␉␉␉␉␉name[strlen(last) - sizeof("dylib")] = 0;␊ |
| 122 | ␉␉␉␉␉␉DBG("Loading multiboot module %s\n", name);␊ |
| 123 | ␊ |
| 124 | ␉␉␉␉␉␉module_start = parse_mach(module_data, &load_module, &add_symbol, NULL);␊ |
| 125 | ␊ |
| 126 | ␉␉␉␉␉␉if(module_start && module_start != (void*)0xFFFFFFFF)␊ |
| 127 | ␉␉␉␉␉␉{␊ |
| 128 | ␉␉␉␉␉␉␉// Notify the system that it was laoded␊ |
| 129 | ␉␉␉␉␉␉␉module_loaded(name, module_start, NULL, NULL, 0, 0 /*moduleName, NULL, moduleVersion, moduleCompat*/);␊ |
| 130 | ␉␉␉␉␉␉␉(*module_start)();␉// Start the module␊ |
| 131 | ␉␉␉␉␉␉␉DBG("Module %s Loaded.\n", name); DBGPAUSE();␊ |
| 132 | ␉␉␉␉␉␉}␊ |
| 133 | ␉␉␉␉␉}␊ |
| 134 | ␉␉␉␉}␊ |
| 135 | ␉␉␉}␊ |
| 136 | ␉␉}␊ |
| 137 | ␉}␊ |
| 138 | ␊ |
| 139 | ␉if(retVal) execute_hook("ModulesLoaded", NULL, NULL, NULL, NULL);␊ |
| 140 | ␊ |
| 141 | ␉return retVal;␊ |
| 142 | }␊ |
| 143 | ␊ |
| 144 | void start_built_in_module(const char* name,␊ |
| 145 | const char* author,␊ |
| 146 | const char* description,␊ |
| 147 | UInt32 version,␊ |
| 148 | UInt32 compat,␊ |
| 149 | void(*start_function)(void))␊ |
| 150 | {␊ |
| 151 | start_function();␊ |
| 152 | // Notify the module system that this module really exists, specificaly, let other module link with it␊ |
| 153 | module_loaded(name, start_function, author, description, version, compat);␊ |
| 154 | }␊ |
| 155 | ␊ |
| 156 | /*␊ |
| 157 | * Load all modules in the /Extra/modules/ directory␊ |
| 158 | * Module depencdies will be loaded first␊ |
| 159 | * Modules will only be loaded once. When loaded a module must␊ |
| 160 | * setup apropriete function calls and hooks as required.␊ |
| 161 | * NOTE: To ensure a module loads after another you may␊ |
| 162 | * link one module with the other. For dyld to allow this, you must␊ |
| 163 | * reference at least one symbol within the module.␊ |
| 164 | */␊ |
| 165 | void load_all_modules()␊ |
| 166 | {␊ |
| 167 | ␉char* name;␊ |
| 168 | ␉long flags;␊ |
| 169 | ␉u_int32_t time;␊ |
| 170 | ␉struct dirstuff* moduleDir = opendir("/Extra/modules/");␊ |
| 171 | ␉if(!moduleDir)␊ |
| 172 | ␉{␊ |
| 173 | ␉␉verbose("Warning: Unable to open modules folder at '/Extra/modules/'. Ignoring modules.\n");␊ |
| 174 | ␉␉return;␊ |
| 175 | ␉}␊ |
| 176 | ␉while (readdir(moduleDir, (const char**)&name, &flags, &time) >= 0) {␊ |
| 177 | ␉␉if(strcmp(&name[strlen(name) - sizeof("dylib")], ".dylib") == 0) {␊ |
| 178 | ␉␉␉char* tmp = malloc(strlen(name) + 1);␊ |
| 179 | ␉␉␉strcpy(tmp, name);␊ |
| 180 | ␊ |
| 181 | ␉␉␉if(!load_module(tmp))␊ |
| 182 | ␉␉␉{␊ |
| 183 | ␉␉␉␉// failed to load␊ |
| 184 | ␉␉␉␉// free(tmp);␊ |
| 185 | ␉␉␉}␊ |
| 186 | ␉␉}␊ |
| 187 | ␉␉else␊ |
| 188 | ␉␉{␊ |
| 189 | ␉␉␉DBG("Ignoring %s\n", name);␊ |
| 190 | ␉␉}␊ |
| 191 | ␊ |
| 192 | ␉}␊ |
| 193 | ␊ |
| 194 | ␉closedir(moduleDir);␊ |
| 195 | }␊ |
| 196 | ␊ |
| 197 | ␊ |
| 198 | /*␊ |
| 199 | * Load a module file in /Extra/modules/␊ |
| 200 | */␊ |
| 201 | int load_module(char* module)␊ |
| 202 | {␊ |
| 203 | ␉int retVal = 1;␊ |
| 204 | ␉void (*module_start)(void) = NULL;␊ |
| 205 | ␉char modString[128];␊ |
| 206 | ␉int fh = -1;␊ |
| 207 | ␊ |
| 208 | ␉// Check to see if the module has already been loaded␊ |
| 209 | ␉if(is_module_loaded(module))␊ |
| 210 | ␉{␊ |
| 211 | ␉␉return 1;␊ |
| 212 | ␉}␊ |
| 213 | ␊ |
| 214 | ␉snprintf(modString, sizeof(modString), MODULE_PATH "%s", module);␊ |
| 215 | ␉fh = open(modString, 0);␊ |
| 216 | ␉if(fh < 0)␊ |
| 217 | ␉{␊ |
| 218 | ␉␉DBG("WARNING: Unable to locate module %s\n", modString); DBGPAUSE();␊ |
| 219 | ␉␉return 0;␊ |
| 220 | ␉}␊ |
| 221 | ␉unsigned int moduleSize = file_size(fh);␊ |
| 222 | ␊ |
| 223 | if(moduleSize == 0)␊ |
| 224 | {␊ |
| 225 | DBG("WARNING: The module %s has a file size of %d, the module will not be loaded.\n", modString, moduleSize);␊ |
| 226 | return 0;␊ |
| 227 | }␊ |
| 228 | ␊ |
| 229 | ␉char* module_base = (char*) malloc(moduleSize);␊ |
| 230 | ␉if (moduleSize && read(fh, module_base, moduleSize) == moduleSize)␊ |
| 231 | ␉{␊ |
| 232 | ␉␉// Module loaded into memory, parse it␊ |
| 233 | ␉␉module_start = parse_mach(module_base, &load_module, &add_symbol, NULL);␊ |
| 234 | ␊ |
| 235 | ␉␉if(module_start && module_start != (void*)0xFFFFFFFF)␊ |
| 236 | ␉␉{␊ |
| 237 | ␉␉␉// Notify the system that it was laoded␊ |
| 238 | ␉␉␉module_loaded(module, module_start, NULL, NULL, 0, 0 /*moduleName, NULL, moduleVersion, moduleCompat*/);␊ |
| 239 | ␉␉␉(*module_start)();␉// Start the module␊ |
| 240 | ␉␉␉DBG("Module %s Loaded.\n", module); DBGPAUSE();␊ |
| 241 | ␉␉}␊ |
| 242 | #if CONFIG_MODULE_DEBUG␊ |
| 243 | ␉␉else // The module does not have a valid start function. This may be a library.␊ |
| 244 | ␉␉{␊ |
| 245 | ␉␉␉printf("WARNING: Unable to start %s\n", module);␊ |
| 246 | ␉␉␉getchar();␊ |
| 247 | ␉␉}␊ |
| 248 | #else␊ |
| 249 | ␉␉else msglog("WARNING: Unable to start %s\n", module);␊ |
| 250 | #endif␊ |
| 251 | ␉}␊ |
| 252 | ␉else␊ |
| 253 | ␉{␊ |
| 254 | ␉␉DBG("Unable to read in module %s\n.", module); DBGPAUSE();␊ |
| 255 | ␉␉retVal = 0;␊ |
| 256 | ␉}␊ |
| 257 | ␊ |
| 258 | ␉close(fh);␊ |
| 259 | ␉return retVal;␊ |
| 260 | }␊ |
| 261 | ␊ |
| 262 | /*␊ |
| 263 | * add_symbol␊ |
| 264 | * This function adds a symbol from a module to the list of known symbols␊ |
| 265 | * possibly change to a pointer and add this to the Symbol module so that it can␊ |
| 266 | * adjust it's internal symbol list (sort) to optimize locating new symbols␊ |
| 267 | * NOTE: returns the address if the symbol is "start", else returns 0xFFFFFFFF␊ |
| 268 | */␊ |
| 269 | long long add_symbol(char* symbol, long long addr, char is64)␊ |
| 270 | {␊ |
| 271 | ␉// This only can handle 32bit symbols␊ |
| 272 | ␉symbolList_t* entry;␊ |
| 273 | ␉DBG("Adding symbol %s at 0x%X\n", symbol, addr);␊ |
| 274 | ␊ |
| 275 | ␉entry = malloc(sizeof(symbolList_t));␊ |
| 276 | ␉entry->next = moduleSymbols;␊ |
| 277 | ␉moduleSymbols = entry;␊ |
| 278 | ␊ |
| 279 | ␉entry->addr = (UInt32)addr;␊ |
| 280 | ␉entry->symbol = symbol;␊ |
| 281 | ␊ |
| 282 | ␉if(!is64 && strcmp(symbol, "start") == 0)␊ |
| 283 | ␉{␊ |
| 284 | ␉␉return addr;␊ |
| 285 | ␉}␊ |
| 286 | ␉else␊ |
| 287 | ␉{␊ |
| 288 | ␉␉return 0xFFFFFFFF; // fixme␊ |
| 289 | ␉}␊ |
| 290 | }␊ |
| 291 | ␊ |
| 292 | ␊ |
| 293 | /*␊ |
| 294 | * print out the information about the loaded module␊ |
| 295 | */␊ |
| 296 | void module_loaded(const char* name, void* start, const char* author, const char* description, UInt32 version, UInt32 compat)␊ |
| 297 | {␊ |
| 298 | ␉moduleList_t* new_entry = malloc(sizeof(moduleList_t));␊ |
| 299 | ␉new_entry->next = loadedModules;␊ |
| 300 | ␊ |
| 301 | ␉loadedModules = new_entry;␊ |
| 302 | ␊ |
| 303 | ␉if(!name) name = "Unknown";␊ |
| 304 | ␉if(!author) author = "Unknown";␊ |
| 305 | ␉if(!description) description = "";␊ |
| 306 | ␊ |
| 307 | ␉new_entry->name = name;␊ |
| 308 | ␉new_entry->author = author;␊ |
| 309 | ␉new_entry->description = description;␊ |
| 310 | ␉new_entry->version = version;␊ |
| 311 | ␉new_entry->compat = compat;␊ |
| 312 | ␊ |
| 313 | ␉DBG("Module '%s' by '%s' Loaded.\n", name, author);␊ |
| 314 | ␉DBG("\tInitialization: 0x%X\n", start);␊ |
| 315 | ␉DBG("\tDescription: %s\n", description);␊ |
| 316 | ␉DBG("\tVersion: %d\n", version); // todo: sperate to major.minor.bugfix␊ |
| 317 | ␉DBG("\tCompat: %d\n", compat); // todo: ^^^ major.minor.bugfix␊ |
| 318 | }␊ |
| 319 | ␊ |
| 320 | int is_module_loaded(const char* name)␊ |
| 321 | {␊ |
| 322 | ␉// todo sorted search␊ |
| 323 | ␉moduleList_t* entry = loadedModules;␊ |
| 324 | ␉while(entry)␊ |
| 325 | ␉{␊ |
| 326 | ␉␉if(strcmp(entry->name, name) == 0)␊ |
| 327 | ␉␉{␊ |
| 328 | ␉␉␉DBG("Located module %s\n", name); DBGPAUSE();␊ |
| 329 | ␉␉␉return 1;␊ |
| 330 | ␉␉}␊ |
| 331 | ␉␉else␊ |
| 332 | ␉␉{␊ |
| 333 | ␉␉␉entry = entry->next;␊ |
| 334 | ␉␉}␊ |
| 335 | ␊ |
| 336 | ␉}␊ |
| 337 | ␊ |
| 338 | ␉DBG("Module %s not loaded\n", name); DBGPAUSE();␊ |
| 339 | ␉return 0;␊ |
| 340 | }␊ |
| 341 | ␊ |
| 342 | /*␊ |
| 343 | *␉lookup symbols in all loaded modules. Thins inludes boot syms due to Symbols.dylib construction␊ |
| 344 | *␊ |
| 345 | */␊ |
| 346 | unsigned int lookup_all_symbols(const char* name)␊ |
| 347 | {␊ |
| 348 | ␉symbolList_t* entry = moduleSymbols;␊ |
| 349 | ␉while(entry)␊ |
| 350 | ␉{␊ |
| 351 | ␉␉if(strcmp(entry->symbol, name) == 0)␊ |
| 352 | ␉␉{␊ |
| 353 | ␉␉␉//DBG("External symbol %s located at 0x%X\n", name, entry->addr);␊ |
| 354 | ␉␉␉return entry->addr;␊ |
| 355 | ␉␉}␊ |
| 356 | ␉␉else if(strcmp(entry->symbol, name + 1) == 0 && *name == '_') // Allow _strstr to bing to strstr, etc␊ |
| 357 | ␉␉{␊ |
| 358 | ␉␉␉//DBG("External symbol %s located at 0x%X\n", name, entry->addr);␊ |
| 359 | ␉␉␉return entry->addr;␊ |
| 360 | ␉␉}␊ |
| 361 | ␉␉else␊ |
| 362 | ␉␉{␊ |
| 363 | ␉␉␉entry = entry->next;␊ |
| 364 | ␉␉}␊ |
| 365 | ␉}␊ |
| 366 | ␊ |
| 367 | #if CONFIG_MODULE_DEBUG␊ |
| 368 | ␉printf("Unable to locate symbol %s\n", name);␊ |
| 369 | ␉getchar();␊ |
| 370 | #endif␊ |
| 371 | ␊ |
| 372 | ␉if(strcmp(name, VOID_SYMBOL) == 0) return 0xFFFFFFFF;␊ |
| 373 | ␉// In the event that a symbol does not exist␊ |
| 374 | ␉// Return a pointer to a void function.␊ |
| 375 | ␉else return lookup_all_symbols(VOID_SYMBOL);␊ |
| 376 | }␊ |
| 377 | ␊ |
| 378 | /********************************************************************************/␊ |
| 379 | /*␉Macho Parser␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉*/␊ |
| 380 | /********************************************************************************/␊ |
| 381 | ␊ |
| 382 | /*␊ |
| 383 | * Parse through a macho module. The module will be rebased and binded␊ |
| 384 | * as specified in the macho header. If the module is successfully loaded␊ |
| 385 | * the module iinit address will be returned.␊ |
| 386 | * NOTE; all dependecies will be loaded before this module is started␊ |
| 387 | * NOTE: If the module is unable to load ot completeion, the modules␊ |
| 388 | * symbols will still be available.␊ |
| 389 | */␊ |
| 390 | void* parse_mach(void* binary,␊ |
| 391 | int(*dylib_loader)(char*),␊ |
| 392 | long long(*symbol_handler)(char*, long long, char),␊ |
| 393 | void (*section_handler)(char* section, char* segment, void* cmd, UInt64 offset, UInt64 address)␊ |
| 394 | )␊ |
| 395 | {␊ |
| 396 | ␉char is64 = false;␊ |
| 397 | ␉void (*module_start)(void) = NULL;␊ |
| 398 | ␊ |
| 399 | ␉// Module info␊ |
| 400 | ␉/*char* moduleName = NULL;␊ |
| 401 | ␉ UInt32 moduleVersion = 0;␊ |
| 402 | ␉ UInt32 moduleCompat = 0;␊ |
| 403 | ␉ */␊ |
| 404 | ␉// TODO convert all of the structs to a union␊ |
| 405 | ␉struct load_command *loadCommand = NULL;␊ |
| 406 | ␉struct dylib_command* dylibCommand = NULL;␊ |
| 407 | ␉struct dyld_info_command* dyldInfoCommand = NULL;␊ |
| 408 | ␊ |
| 409 | ␉struct symtab_command* symtabCommand = NULL;␊ |
| 410 | ␉struct segment_command *segCommand = NULL;␊ |
| 411 | ␉struct segment_command_64 *segCommand64 = NULL;␊ |
| 412 | ␊ |
| 413 | ␉//struct dysymtab_command* dysymtabCommand = NULL;␊ |
| 414 | ␉UInt32 binaryIndex = 0;␊ |
| 415 | ␉UInt16 cmd = 0;␊ |
| 416 | ␊ |
| 417 | ␉textSection = 0;␊ |
| 418 | ␉textAddress = 0;␉// reinitialize text location in case it doesn't exist;␊ |
| 419 | ␊ |
| 420 | ␉// Parse through the load commands␊ |
| 421 | ␉if(((struct mach_header*)binary)->magic == MH_MAGIC)␊ |
| 422 | ␉{␊ |
| 423 | ␉␉is64 = false;␊ |
| 424 | ␉␉binaryIndex += sizeof(struct mach_header);␊ |
| 425 | ␉}␊ |
| 426 | ␉else if(((struct mach_header_64*)binary)->magic == MH_MAGIC_64)␊ |
| 427 | ␉{␊ |
| 428 | ␉␉// NOTE: modules cannot be 64bit. This is used to parse the kernel and kexts␊ |
| 429 | ␉␉is64 = true;␊ |
| 430 | ␉␉binaryIndex += sizeof(struct mach_header_64);␊ |
| 431 | ␉}␊ |
| 432 | ␉else␊ |
| 433 | ␉{␊ |
| 434 | ␉␉verbose("Invalid mach magic 0x%X\n", ((struct mach_header*)binary)->magic);␊ |
| 435 | ␉␉return NULL;␊ |
| 436 | ␉}␊ |
| 437 | ␊ |
| 438 | ␉/*if(((struct mach_header*)binary)->filetype != MH_DYLIB)␊ |
| 439 | ␉ {␊ |
| 440 | ␉ printf("Module is not a dylib. Unable to load.\n");␊ |
| 441 | ␉ getchar();␊ |
| 442 | ␉ return NULL; // Module is in the incorrect format␊ |
| 443 | ␉ }*/␊ |
| 444 | ␊ |
| 445 | ␉while(cmd < ((struct mach_header*)binary)->ncmds)␊ |
| 446 | ␉{␊ |
| 447 | ␉␉cmd++;␊ |
| 448 | ␊ |
| 449 | ␉␉loadCommand = binary + binaryIndex;␊ |
| 450 | ␉␉UInt32 cmdSize = loadCommand->cmdsize;␊ |
| 451 | ␊ |
| 452 | ␊ |
| 453 | ␉␉switch ((loadCommand->cmd & 0x7FFFFFFF))␊ |
| 454 | ␉␉{␊ |
| 455 | ␉␉␉case LC_SYMTAB:␊ |
| 456 | ␉␉␉␉symtabCommand = binary + binaryIndex;␊ |
| 457 | ␉␉␉␉break;␊ |
| 458 | ␊ |
| 459 | ␉␉␉case LC_SEGMENT: // 32bit macho␊ |
| 460 | {␊ |
| 461 | segCommand = binary + binaryIndex;␊ |
| 462 | ␊ |
| 463 | UInt32 sectionIndex;␊ |
| 464 | ␊ |
| 465 | sectionIndex = sizeof(struct segment_command);␊ |
| 466 | ␊ |
| 467 | struct section *sect;␊ |
| 468 | ␊ |
| 469 | while(sectionIndex < segCommand->cmdsize)␊ |
| 470 | {␊ |
| 471 | sect = binary + binaryIndex + sectionIndex;␊ |
| 472 | ␊ |
| 473 | sectionIndex += sizeof(struct section);␊ |
| 474 | ␊ |
| 475 | if(section_handler) section_handler(sect->sectname, segCommand->segname, (void*)sect, sect->offset, sect->addr);␊ |
| 476 | ␊ |
| 477 | if((strcmp("__TEXT", segCommand->segname) == 0) && (strcmp("__text", sect->sectname) == 0))␊ |
| 478 | {␊ |
| 479 | // __TEXT,__text found, save the offset and address for when looking for the calls.␊ |
| 480 | textSection = sect->offset;␊ |
| 481 | textAddress = sect->addr;␊ |
| 482 | }␊ |
| 483 | }␊ |
| 484 | }␊ |
| 485 | ␉␉␉␉break;␊ |
| 486 | case LC_SEGMENT_64:␉// 64bit macho's␊ |
| 487 | {␊ |
| 488 | segCommand64 = binary + binaryIndex;␊ |
| 489 | UInt32 sectionIndex;␊ |
| 490 | ␊ |
| 491 | sectionIndex = sizeof(struct segment_command_64);␊ |
| 492 | ␊ |
| 493 | struct section_64 *sect;␊ |
| 494 | ␊ |
| 495 | while(sectionIndex < segCommand64->cmdsize)␊ |
| 496 | {␊ |
| 497 | sect = binary + binaryIndex + sectionIndex;␊ |
| 498 | ␊ |
| 499 | sectionIndex += sizeof(struct section_64);␊ |
| 500 | ␊ |
| 501 | if(section_handler) section_handler(sect->sectname, segCommand64->segname, (void*)sect, sect->offset, sect->addr);␊ |
| 502 | ␊ |
| 503 | if((strcmp("__TEXT", segCommand64->segname) == 0) && (strcmp("__text", sect->sectname) == 0))␊ |
| 504 | {␊ |
| 505 | // __TEXT,__text found, save the offset and address for when looking for the calls.␊ |
| 506 | textSection = sect->offset;␊ |
| 507 | textAddress = sect->addr;␊ |
| 508 | }␊ |
| 509 | }␊ |
| 510 | ␉␉␉␉}␊ |
| 511 | ␉␉␉␉break;␊ |
| 512 | ␊ |
| 513 | ␊ |
| 514 | ␉␉␉case LC_LOAD_DYLIB:␊ |
| 515 | ␉␉␉case LC_LOAD_WEAK_DYLIB ^ LC_REQ_DYLD:␊ |
| 516 | // Required modules␊ |
| 517 | ␉␉␉␉dylibCommand = binary + binaryIndex;␊ |
| 518 | ␉␉␉␉char* module = binary + binaryIndex + ((UInt32)*((UInt32*)&dylibCommand->dylib.name));␊ |
| 519 | ␉␉␉␉// Possible enhancments: verify version␊ |
| 520 | ␉␉␉␉// =␉dylibCommand->dylib.current_version;␊ |
| 521 | ␉␉␉␉// =␉dylibCommand->dylib.compatibility_version;␊ |
| 522 | ␉␉␉␉if(dylib_loader)␊ |
| 523 | ␉␉␉␉{␊ |
| 524 | ␉␉␉␉␉char* name = malloc(strlen(module) + strlen(".dylib") + 1);␊ |
| 525 | ␉␉␉␉␉sprintf(name, "%s.dylib", module);␊ |
| 526 | ␊ |
| 527 | ␉␉␉␉␉if (!dylib_loader(name))␊ |
| 528 | ␉␉␉␉␉{␊ |
| 529 | ␉␉␉␉␉␉// NOTE: any symbols exported by dep will be replace with the void function␊ |
| 530 | ␉␉␉␉␉␉free(name);␊ |
| 531 | ␉␉␉␉␉}␊ |
| 532 | ␉␉␉␉}␊ |
| 533 | ␊ |
| 534 | ␉␉␉␉break;␊ |
| 535 | ␊ |
| 536 | ␉␉␉case LC_ID_DYLIB:␊ |
| 537 | ␉␉␉␉//dylibCommand = binary + binaryIndex;␊ |
| 538 | ␉␉␉␉/*moduleName =␉binary + binaryIndex + ((UInt32)*((UInt32*)&dylibCommand->dylib.name));␊ |
| 539 | ␉␉␉␉ moduleVersion =␉dylibCommand->dylib.current_version;␊ |
| 540 | ␉␉␉␉ moduleCompat =␉dylibCommand->dylib.compatibility_version;␊ |
| 541 | ␉␉␉␉ */␊ |
| 542 | ␉␉␉␉break;␊ |
| 543 | ␊ |
| 544 | ␉␉␉case LC_DYLD_INFO:␊ |
| 545 | ␉␉␉//case LC_DYLD_INFO_ONLY:␉// compressed info, 10.6+ macho files, already handeled␊ |
| 546 | ␉␉␉␉// Bind and rebase info is stored here␊ |
| 547 | ␉␉␉␉dyldInfoCommand = binary + binaryIndex;␊ |
| 548 | ␉␉␉␉break;␊ |
| 549 | ␊ |
| 550 | ␉␉␉case LC_DYSYMTAB:␊ |
| 551 | ␉␉␉case LC_UUID:␊ |
| 552 | ␉␉␉␉break;␊ |
| 553 | ␊ |
| 554 | ␉␉␉case LC_UNIXTHREAD:␊ |
| 555 | ␉␉␉␉break;␊ |
| 556 | ␊ |
| 557 | ␉␉␉case LC_VERSION_MIN_MACOSX:␊ |
| 558 | ␉␉␉␉break;␊ |
| 559 | ␊ |
| 560 | ␉␉␉case LC_DATA_IN_CODE:␊ |
| 561 | ␉␉␉␉break;␊ |
| 562 | ␊ |
| 563 | ␉␉␉case LC_FUNCTION_STARTS:␊ |
| 564 | ␉␉␉␉break;␊ |
| 565 | ␊ |
| 566 | ␉␉␉default:␊ |
| 567 | ␉␉␉␉DBG("Unhandled loadcommand 0x%X\n", loadCommand->cmd & 0x7FFFFFFF);␊ |
| 568 | ␉␉␉␉break;␊ |
| 569 | ␊ |
| 570 | ␉␉}␊ |
| 571 | ␊ |
| 572 | ␉␉binaryIndex += cmdSize;␊ |
| 573 | ␉}␊ |
| 574 | ␊ |
| 575 | ␉// bind_macho uses the symbols, if the textAdd does not exist (Symbols.dylib, no code), addresses are static and not relative␊ |
| 576 | ␉module_start = (void*)handle_symtable((UInt32)binary, symtabCommand, symbol_handler, is64);␊ |
| 577 | ␊ |
| 578 | ␉if(dyldInfoCommand)␊ |
| 579 | ␉{␊ |
| 580 | ␉␉// Rebase the module before binding it.␊ |
| 581 | ␉␉if(dyldInfoCommand->rebase_off)␉␉rebase_macho(binary, (char*)dyldInfoCommand->rebase_off,␉dyldInfoCommand->rebase_size);␊ |
| 582 | ␉␉// Bind all symbols.␊ |
| 583 | ␉␉if(dyldInfoCommand->bind_off)␉␉bind_macho(binary, (UInt8*)dyldInfoCommand->bind_off,␉␉dyldInfoCommand->bind_size);␊ |
| 584 | ␉␉if(dyldInfoCommand->weak_bind_off)␉bind_macho(binary, (UInt8*)dyldInfoCommand->weak_bind_off,␉dyldInfoCommand->weak_bind_size);␊ |
| 585 | ␉␉if(dyldInfoCommand->lazy_bind_off)␉bind_macho(binary, (UInt8*)dyldInfoCommand->lazy_bind_off,␉dyldInfoCommand->lazy_bind_size);␊ |
| 586 | ␉}␊ |
| 587 | ␊ |
| 588 | ␉return module_start;␊ |
| 589 | ␊ |
| 590 | }␊ |
| 591 | ␊ |
| 592 | /*␊ |
| 593 | * parse the symbol table␊ |
| 594 | * Lookup any undefined symbols␊ |
| 595 | */␊ |
| 596 | ␊ |
| 597 | unsigned int handle_symtable(UInt32 base, struct symtab_command* symtabCommand, long long(*symbol_handler)(char*, long long, char), char is64)␊ |
| 598 | {␊ |
| 599 | ␉unsigned int module_start␉= 0xFFFFFFFF;␊ |
| 600 | ␉UInt32 symbolIndex␉␉␉= 0;␊ |
| 601 | ␉char* symbolString␉␉␉= base + (char*)symtabCommand->stroff;␊ |
| 602 | ␊ |
| 603 | ␉if(!is64)␊ |
| 604 | ␉{␊ |
| 605 | ␉␉struct nlist* symbolEntry = (void*)base + symtabCommand->symoff;␊ |
| 606 | ␉␉while(symbolIndex < symtabCommand->nsyms)␊ |
| 607 | ␉␉{␊ |
| 608 | ␉␉␉// If the symbol is exported by this module␊ |
| 609 | ␉␉␉if(symbolEntry->n_value &&␊ |
| 610 | ␉␉␉ symbol_handler(symbolString + symbolEntry->n_un.n_strx, textAddress ? (long long)base + symbolEntry->n_value : symbolEntry->n_value, is64) != 0xFFFFFFFF)␊ |
| 611 | ␉␉␉{␊ |
| 612 | ␊ |
| 613 | ␉␉␉␉// Module start located. Start is an alias so don't register it␊ |
| 614 | ␉␉␉␉module_start = textAddress ? base + symbolEntry->n_value : symbolEntry->n_value;␊ |
| 615 | ␉␉␉}␊ |
| 616 | ␊ |
| 617 | ␉␉␉symbolEntry++;␊ |
| 618 | ␉␉␉symbolIndex++;␉// TODO remove␊ |
| 619 | ␉␉}␊ |
| 620 | ␉}␊ |
| 621 | ␉else␊ |
| 622 | ␉{␊ |
| 623 | ␉␉struct nlist_64* symbolEntry = (void*)base + symtabCommand->symoff;␊ |
| 624 | ␉␉// NOTE First entry is *not* correct, but we can ignore it (i'm getting radar:// right now, verify later)␊ |
| 625 | ␉␉while(symbolIndex < symtabCommand->nsyms)␊ |
| 626 | ␉␉{␊ |
| 627 | ␊ |
| 628 | ␊ |
| 629 | ␉␉␉// If the symbol is exported by this module␊ |
| 630 | ␉␉␉if(symbolEntry->n_value &&␊ |
| 631 | ␉␉␉ symbol_handler(symbolString + symbolEntry->n_un.n_strx, textAddress ? (long long)base + symbolEntry->n_value : symbolEntry->n_value, is64) != 0xFFFFFFFF)␊ |
| 632 | ␉␉␉{␊ |
| 633 | ␊ |
| 634 | ␉␉␉␉// Module start located. Start is an alias so don't register it␊ |
| 635 | ␉␉␉␉module_start = textAddress ? base + symbolEntry->n_value : symbolEntry->n_value;␊ |
| 636 | ␉␉␉}␊ |
| 637 | ␊ |
| 638 | ␉␉␉symbolEntry++;␊ |
| 639 | ␉␉␉symbolIndex++;␉// TODO remove␊ |
| 640 | ␉␉}␊ |
| 641 | ␉}␊ |
| 642 | ␉return module_start;␊ |
| 643 | }␊ |
| 644 | ␊ |
| 645 | // Based on code from dylibinfo.cpp and ImageLoaderMachOCompressed.cpp␊ |
| 646 | void rebase_macho(void* base, char* rebase_stream, UInt32 size)␊ |
| 647 | {␊ |
| 648 | ␉rebase_stream += (UInt32)base;␊ |
| 649 | ␊ |
| 650 | ␉UInt8 immediate = 0;␊ |
| 651 | ␉UInt8 opcode = 0;␊ |
| 652 | ␉UInt8 type = 0;␊ |
| 653 | ␊ |
| 654 | ␉UInt32 segmentAddress = 0;␊ |
| 655 | ␊ |
| 656 | ␊ |
| 657 | ␉UInt32 tmp = 0;␊ |
| 658 | ␉UInt32 tmp2 = 0;␊ |
| 659 | ␉UInt8 bits = 0;␊ |
| 660 | ␉int index = 0;␊ |
| 661 | ␉unsigned int i = 0;␊ |
| 662 | ␊ |
| 663 | ␉while(i < size)␊ |
| 664 | ␉{␊ |
| 665 | ␉␉immediate = rebase_stream[i] & REBASE_IMMEDIATE_MASK;␊ |
| 666 | ␉␉opcode = rebase_stream[i] & REBASE_OPCODE_MASK;␊ |
| 667 | ␊ |
| 668 | ␊ |
| 669 | ␉␉switch(opcode)␊ |
| 670 | ␉␉{␊ |
| 671 | ␉␉␉case REBASE_OPCODE_DONE:␊ |
| 672 | ␉␉␉␉// Rebase complete, reset vars␊ |
| 673 | ␉␉␉␉immediate = 0;␊ |
| 674 | ␉␉␉␉opcode = 0;␊ |
| 675 | ␉␉␉␉type = 0;␊ |
| 676 | ␉␉␉␉segmentAddress = 0;␊ |
| 677 | ␉␉␉␉break;␊ |
| 678 | ␊ |
| 679 | ␊ |
| 680 | ␉␉␉case REBASE_OPCODE_SET_TYPE_IMM:␊ |
| 681 | ␉␉␉␉type = immediate;␊ |
| 682 | ␉␉␉␉break;␊ |
| 683 | ␊ |
| 684 | ␊ |
| 685 | ␉␉␉case REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:␊ |
| 686 | ␊ |
| 687 | ␉␉␉␉// Locate address to begin rebasing␊ |
| 688 | ␉␉␉␉segmentAddress = 0;␊ |
| 689 | ␉␉␉␉struct segment_command* segCommand = NULL; // NOTE: 32bit only␊ |
| 690 | ␊ |
| 691 | ␉␉␉␉unsigned int binIndex = 0;␊ |
| 692 | ␉␉␉␉index = 0;␊ |
| 693 | ␉␉␉␉do {␊ |
| 694 | ␉␉␉␉␉segCommand = base + sizeof(struct mach_header) + binIndex;␊ |
| 695 | ␊ |
| 696 | ␉␉␉␉␉binIndex += segCommand->cmdsize;␊ |
| 697 | ␉␉␉␉␉index++;␊ |
| 698 | ␉␉␉␉} while(index <= immediate);␊ |
| 699 | ␊ |
| 700 | ␉␉␉␉segmentAddress = segCommand->fileoff;␊ |
| 701 | ␊ |
| 702 | ␉␉␉␉tmp = 0;␊ |
| 703 | ␉␉␉␉bits = 0;␊ |
| 704 | ␉␉␉␉do {␊ |
| 705 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
| 706 | ␉␉␉␉␉bits += 7;␊ |
| 707 | ␉␉␉␉}␊ |
| 708 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
| 709 | ␊ |
| 710 | ␉␉␉␉segmentAddress += tmp;␊ |
| 711 | ␉␉␉␉break;␊ |
| 712 | ␊ |
| 713 | ␉␉␉case REBASE_OPCODE_ADD_ADDR_ULEB:␊ |
| 714 | ␉␉␉␉// Add value to rebase address␊ |
| 715 | ␉␉␉␉tmp = 0;␊ |
| 716 | ␉␉␉␉bits = 0;␊ |
| 717 | ␉␉␉␉do {␊ |
| 718 | ␉␉␉␉␉tmp <<= bits;␊ |
| 719 | ␉␉␉␉␉tmp |= rebase_stream[++i] & 0x7f;␊ |
| 720 | ␉␉␉␉␉bits += 7;␊ |
| 721 | ␉␉␉␉} while(rebase_stream[i] & 0x80);␊ |
| 722 | ␊ |
| 723 | ␉␉␉␉segmentAddress +=␉tmp;␊ |
| 724 | ␉␉␉␉break;␊ |
| 725 | ␊ |
| 726 | ␉␉␉case REBASE_OPCODE_ADD_ADDR_IMM_SCALED:␊ |
| 727 | ␉␉␉␉segmentAddress += immediate * sizeof(void*);␊ |
| 728 | ␉␉␉␉break;␊ |
| 729 | ␊ |
| 730 | ␊ |
| 731 | ␉␉␉case REBASE_OPCODE_DO_REBASE_IMM_TIMES:␊ |
| 732 | ␉␉␉␉index = 0;␊ |
| 733 | ␉␉␉␉for (index = 0; index < immediate; ++index) {␊ |
| 734 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␊ |
| 735 | ␉␉␉␉␉segmentAddress += sizeof(void*);␊ |
| 736 | ␉␉␉␉}␊ |
| 737 | ␉␉␉␉break;␊ |
| 738 | ␊ |
| 739 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ULEB_TIMES:␊ |
| 740 | ␉␉␉␉tmp = 0;␊ |
| 741 | ␉␉␉␉bits = 0;␊ |
| 742 | ␉␉␉␉do {␊ |
| 743 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
| 744 | ␉␉␉␉␉bits += 7;␊ |
| 745 | ␉␉␉␉} while(rebase_stream[i] & 0x80);␊ |
| 746 | ␊ |
| 747 | ␉␉␉␉index = 0;␊ |
| 748 | ␉␉␉␉for (index = 0; index < tmp; ++index) {␊ |
| 749 | ␉␉␉␉␉//DBG("\tRebasing 0x%X\n", segmentAddress);␊ |
| 750 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␊ |
| 751 | ␉␉␉␉␉segmentAddress += sizeof(void*);␊ |
| 752 | ␉␉␉␉}␊ |
| 753 | ␉␉␉␉break;␊ |
| 754 | ␊ |
| 755 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB:␊ |
| 756 | ␉␉␉␉tmp = 0;␊ |
| 757 | ␉␉␉␉bits = 0;␊ |
| 758 | ␉␉␉␉do {␊ |
| 759 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
| 760 | ␉␉␉␉␉bits += 7;␊ |
| 761 | ␉␉␉␉} while(rebase_stream[i] & 0x80);␊ |
| 762 | ␊ |
| 763 | ␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␊ |
| 764 | ␊ |
| 765 | ␉␉␉␉segmentAddress += tmp + sizeof(void*);␊ |
| 766 | ␉␉␉␉break;␊ |
| 767 | ␊ |
| 768 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB:␊ |
| 769 | ␉␉␉␉tmp = 0;␊ |
| 770 | ␉␉␉␉bits = 0;␊ |
| 771 | ␉␉␉␉do {␊ |
| 772 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
| 773 | ␉␉␉␉␉bits += 7;␊ |
| 774 | ␉␉␉␉} while(rebase_stream[i] & 0x80);␊ |
| 775 | ␊ |
| 776 | ␊ |
| 777 | ␉␉␉␉tmp2 = 0;␊ |
| 778 | ␉␉␉␉bits = 0;␊ |
| 779 | ␉␉␉␉do {␊ |
| 780 | ␉␉␉␉␉tmp2 |= (rebase_stream[++i] & 0x7f) << bits;␊ |
| 781 | ␉␉␉␉␉bits += 7;␊ |
| 782 | ␉␉␉␉} while(rebase_stream[i] & 0x80);␊ |
| 783 | ␊ |
| 784 | ␉␉␉␉index = 0;␊ |
| 785 | ␉␉␉␉for (index = 0; index < tmp; ++index) {␊ |
| 786 | ␊ |
| 787 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␊ |
| 788 | ␊ |
| 789 | ␉␉␉␉␉segmentAddress += tmp2 + sizeof(void*);␊ |
| 790 | ␉␉␉␉}␊ |
| 791 | ␉␉␉␉break;␊ |
| 792 | ␉␉␉default:␊ |
| 793 | ␉␉␉␉break;␊ |
| 794 | ␉␉}␊ |
| 795 | ␉␉i++;␊ |
| 796 | ␉}␊ |
| 797 | }␊ |
| 798 | ␊ |
| 799 | ␊ |
| 800 | UInt32 read_uleb(UInt8* bind_stream, unsigned int* i)␊ |
| 801 | {␊ |
| 802 | ␉// Read in offset␊ |
| 803 | ␉UInt32 tmp = 0;␊ |
| 804 | ␉UInt8 bits = 0;␊ |
| 805 | ␉do {␊ |
| 806 | ␉␉if(bits < sizeof(UInt32)*8) { // hack␊ |
| 807 | ␉␉␉tmp |= (bind_stream[++(*i)] & 0x7f) << bits;␊ |
| 808 | ␉␉␉bits += 7;␊ |
| 809 | ␉␉} else {␊ |
| 810 | ␉␉++(*i);␊ |
| 811 | ␉␉}␊ |
| 812 | ␉} while(bind_stream[*i] & 0x80);␊ |
| 813 | ␉return tmp;␊ |
| 814 | }␊ |
| 815 | ␊ |
| 816 | ␊ |
| 817 | // Based on code from dylibinfo.cpp and ImageLoaderMachOCompressed.cpp␊ |
| 818 | // NOTE: this uses 32bit values, and not 64bit values.␊ |
| 819 | // There is a possibility that this could cause issues,␊ |
| 820 | // however the modules are 32 bits, so it shouldn't matter too much␊ |
| 821 | void bind_macho(void* base, UInt8* bind_stream, UInt32 size)␊ |
| 822 | {␊ |
| 823 | ␉bind_stream += (UInt32)base;␊ |
| 824 | ␊ |
| 825 | ␉UInt8 immediate = 0;␊ |
| 826 | ␉UInt8 opcode = 0;␊ |
| 827 | ␉UInt8 type = BIND_TYPE_POINTER;␊ |
| 828 | ␊ |
| 829 | ␉UInt32 segmentAddress = 0;␊ |
| 830 | ␊ |
| 831 | ␉UInt32 address = 0;␊ |
| 832 | ␊ |
| 833 | ␉SInt32 addend = 0;␊ |
| 834 | ␉SInt32 libraryOrdinal = 0;␊ |
| 835 | ␊ |
| 836 | ␉const char* symbolName = NULL;␊ |
| 837 | ␉UInt8 symboFlags = 0;␊ |
| 838 | ␉UInt32 symbolAddr = 0xFFFFFFFF;␊ |
| 839 | ␊ |
| 840 | ␉// Temperary variables␊ |
| 841 | ␉UInt32 tmp = 0;␊ |
| 842 | ␉UInt32 tmp2 = 0;␊ |
| 843 | ␊ |
| 844 | ␉UInt32 index = 0;␊ |
| 845 | ␉unsigned int i = 0;␊ |
| 846 | ␊ |
| 847 | ␉while(i < size)␊ |
| 848 | ␉{␊ |
| 849 | ␉␉immediate = bind_stream[i] & BIND_IMMEDIATE_MASK;␊ |
| 850 | ␉␉opcode = bind_stream[i] & BIND_OPCODE_MASK;␊ |
| 851 | ␊ |
| 852 | ␊ |
| 853 | ␉␉switch(opcode)␊ |
| 854 | ␉␉{␊ |
| 855 | ␉␉␉case BIND_OPCODE_DONE:␊ |
| 856 | ␉␉␉␉// reset vars␊ |
| 857 | ␉␉␉␉type = BIND_TYPE_POINTER;␊ |
| 858 | ␉␉␉␉segmentAddress = 0;␊ |
| 859 | ␉␉␉␉address = 0;␊ |
| 860 | ␉␉␉␉addend = 0;␊ |
| 861 | ␉␉␉␉libraryOrdinal = 0;␊ |
| 862 | ␉␉␉␉symbolAddr = 0xFFFFFFFF;␊ |
| 863 | ␉␉␉␉break;␊ |
| 864 | ␊ |
| 865 | ␉␉␉case BIND_OPCODE_SET_DYLIB_ORDINAL_IMM:␊ |
| 866 | ␉␉␉␉libraryOrdinal = immediate;␊ |
| 867 | ␉␉␉␉break;␊ |
| 868 | ␊ |
| 869 | ␉␉␉case BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB:␊ |
| 870 | ␉␉␉␉libraryOrdinal = read_uleb(bind_stream, &i);␊ |
| 871 | ␉␉␉␉break;␊ |
| 872 | ␊ |
| 873 | ␉␉␉case BIND_OPCODE_SET_DYLIB_SPECIAL_IMM:␊ |
| 874 | ␉␉␉␉libraryOrdinal = immediate ? (SInt8)(BIND_OPCODE_MASK | immediate) : immediate;␊ |
| 875 | ␉␉␉␉break;␊ |
| 876 | ␊ |
| 877 | ␉␉␉case BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:␊ |
| 878 | ␉␉␉␉symboFlags = immediate;␊ |
| 879 | ␉␉␉␉symbolName = (char*)&bind_stream[++i];␊ |
| 880 | ␉␉␉␉i += strlen((char*)&bind_stream[i]);␊ |
| 881 | ␊ |
| 882 | ␉␉␉␉symbolAddr = lookup_all_symbols(symbolName);␊ |
| 883 | ␉␉␉␉break;␊ |
| 884 | ␊ |
| 885 | ␉␉␉case BIND_OPCODE_SET_TYPE_IMM:␊ |
| 886 | ␉␉␉␉type = immediate;␊ |
| 887 | ␉␉␉␉break;␊ |
| 888 | ␊ |
| 889 | ␉␉␉case BIND_OPCODE_SET_ADDEND_SLEB:␊ |
| 890 | ␉␉␉␉addend = read_uleb(bind_stream, &i);␊ |
| 891 | ␉␉␉␉if(!(bind_stream[i-1] & 0x40)) addend *= -1;␊ |
| 892 | ␉␉␉␉break;␊ |
| 893 | ␊ |
| 894 | ␉␉␉case BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:␊ |
| 895 | ␉␉␉␉segmentAddress = 0;␊ |
| 896 | ␊ |
| 897 | ␉␉␉␉// Locate address␊ |
| 898 | ␉␉␉␉struct segment_command* segCommand = NULL;␉// NOTE: 32bit only␊ |
| 899 | ␊ |
| 900 | ␉␉␉␉unsigned int binIndex = 0;␊ |
| 901 | ␉␉␉␉index = 0;␊ |
| 902 | ␉␉␉␉do␊ |
| 903 | ␉␉␉␉{␊ |
| 904 | ␉␉␉␉␉segCommand = base + sizeof(struct mach_header) + binIndex;␊ |
| 905 | ␉␉␉␉␉binIndex += segCommand->cmdsize;␊ |
| 906 | ␉␉␉␉␉index++;␊ |
| 907 | ␉␉␉␉}␊ |
| 908 | ␉␉␉␉while(index <= immediate);␊ |
| 909 | ␊ |
| 910 | ␉␉␉␉segmentAddress = segCommand->fileoff;␊ |
| 911 | ␊ |
| 912 | ␉␉␉␉segmentAddress += read_uleb(bind_stream, &i);␊ |
| 913 | ␉␉␉␉break;␊ |
| 914 | ␊ |
| 915 | ␉␉␉case BIND_OPCODE_ADD_ADDR_ULEB:␊ |
| 916 | ␉␉␉␉segmentAddress += read_uleb(bind_stream, &i);␊ |
| 917 | ␉␉␉␉break;␊ |
| 918 | ␊ |
| 919 | ␉␉␉case BIND_OPCODE_DO_BIND:␊ |
| 920 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
| 921 | ␉␉␉␉{␊ |
| 922 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
| 923 | ␊ |
| 924 | ␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, type);␊ |
| 925 | ␉␉␉␉}␊ |
| 926 | ␉␉␉␉else␊ |
| 927 | ␉␉␉␉{␊ |
| 928 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
| 929 | ␉␉␉␉␉getchar();␊ |
| 930 | ␉␉␉␉}␊ |
| 931 | ␊ |
| 932 | ␉␉␉␉segmentAddress += sizeof(void*);␊ |
| 933 | ␉␉␉␉break;␊ |
| 934 | ␊ |
| 935 | ␉␉␉case BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:␊ |
| 936 | ␉␉␉␉// Read in offset␊ |
| 937 | ␉␉␉␉tmp = read_uleb(bind_stream, &i);␊ |
| 938 | ␊ |
| 939 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
| 940 | ␉␉␉␉{␊ |
| 941 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
| 942 | ␊ |
| 943 | ␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, type);␊ |
| 944 | ␉␉␉␉}␊ |
| 945 | ␉␉␉␉else␊ |
| 946 | ␉␉␉␉{␊ |
| 947 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
| 948 | ␉␉␉␉␉getchar();␊ |
| 949 | ␉␉␉␉}␊ |
| 950 | ␊ |
| 951 | ␉␉␉␉segmentAddress += tmp + sizeof(void*);␊ |
| 952 | ␊ |
| 953 | ␊ |
| 954 | ␉␉␉␉break;␊ |
| 955 | ␊ |
| 956 | ␉␉␉case BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED:␊ |
| 957 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
| 958 | ␉␉␉␉{␊ |
| 959 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
| 960 | ␊ |
| 961 | ␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, type);␊ |
| 962 | ␉␉␉␉}␊ |
| 963 | ␉␉␉␉else␊ |
| 964 | ␉␉␉␉{␊ |
| 965 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
| 966 | ␉␉␉␉␉getchar();␊ |
| 967 | ␉␉␉␉}␊ |
| 968 | ␉␉␉␉segmentAddress += (immediate * sizeof(void*)) + sizeof(void*);␊ |
| 969 | ␊ |
| 970 | ␊ |
| 971 | ␉␉␉␉break;␊ |
| 972 | ␊ |
| 973 | ␉␉␉case BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:␊ |
| 974 | ␉␉␉␉tmp = read_uleb(bind_stream, &i);␊ |
| 975 | ␊ |
| 976 | ␉␉␉␉tmp2 = read_uleb(bind_stream, &i);␊ |
| 977 | ␊ |
| 978 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
| 979 | ␉␉␉␉{␊ |
| 980 | ␉␉␉␉␉for(index = 0; index < tmp; index++)␊ |
| 981 | ␉␉␉␉␉{␊ |
| 982 | ␊ |
| 983 | ␉␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
| 984 | ␉␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, type);␊ |
| 985 | ␉␉␉␉␉␉segmentAddress += tmp2 + sizeof(void*);␊ |
| 986 | ␉␉␉␉␉}␊ |
| 987 | ␉␉␉␉}␊ |
| 988 | ␉␉␉␉else␊ |
| 989 | ␉␉␉␉{␊ |
| 990 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
| 991 | ␉␉␉␉␉getchar();␊ |
| 992 | ␉␉␉␉}␊ |
| 993 | ␉␉␉␉break;␊ |
| 994 | ␉␉␉default:␊ |
| 995 | ␉␉␉␉break;␊ |
| 996 | ␊ |
| 997 | ␉␉}␊ |
| 998 | ␉␉i++;␊ |
| 999 | ␉}␊ |
| 1000 | }␊ |
| 1001 | ␊ |
| 1002 | static inline void rebase_location(UInt32* location, char* base, int type)␊ |
| 1003 | {␊ |
| 1004 | ␉switch(type)␊ |
| 1005 | ␉{␊ |
| 1006 | ␉␉case REBASE_TYPE_POINTER:␊ |
| 1007 | ␉␉case REBASE_TYPE_TEXT_ABSOLUTE32:␊ |
| 1008 | ␉␉␉*location += (UInt32)base;␊ |
| 1009 | ␉␉␉break;␊ |
| 1010 | ␊ |
| 1011 | ␉␉default:␊ |
| 1012 | ␉␉␉break;␊ |
| 1013 | ␉}␊ |
| 1014 | }␊ |
| 1015 | ␊ |
| 1016 | ␊ |
| 1017 | static inline void bind_location(UInt32* location, char* value, UInt32 addend, int type)␊ |
| 1018 | {␊ |
| 1019 | ␉// do actual update␊ |
| 1020 | ␉char* newValue = value + addend;␊ |
| 1021 | ␊ |
| 1022 | ␉switch (type) {␊ |
| 1023 | ␉␉case BIND_TYPE_POINTER:␊ |
| 1024 | ␉␉case BIND_TYPE_TEXT_ABSOLUTE32:␊ |
| 1025 | ␉␉␉break;␊ |
| 1026 | ␊ |
| 1027 | ␉␉case BIND_TYPE_TEXT_PCREL32:␊ |
| 1028 | ␉␉␉newValue -= ((UInt32)location + 4);␊ |
| 1029 | ␊ |
| 1030 | ␉␉␉break;␊ |
| 1031 | ␉␉default:␊ |
| 1032 | ␉␉␉return;␊ |
| 1033 | ␉}␊ |
| 1034 | ␉//DBG("Binding 0x%X to 0x%X (was 0x%X)\n", location, newValue, *location);␊ |
| 1035 | ␉*location = (UInt32)newValue;␊ |
| 1036 | }␊ |
| 1037 | ␊ |
| 1038 | /********************************************************************************/␊ |
| 1039 | /*␉Module Hook Interface␉␉␉␉␉␉␉␉␉␉␉␉␉␉*/␊ |
| 1040 | /********************************************************************************/␊ |
| 1041 | ␊ |
| 1042 | /*␊ |
| 1043 | * Locate the symbol for an already loaded function and modify the beginning of␊ |
| 1044 | * the function to jump directly to the new one␊ |
| 1045 | * example: replace_function("_HelloWorld_start", &replacement_start);␊ |
| 1046 | */␊ |
| 1047 | int replace_function(const char* symbol, void* newAddress)␊ |
| 1048 | {␊ |
| 1049 | ␉UInt32 addr = lookup_all_symbols(symbol);␊ |
| 1050 | ␉if(addr != 0xFFFFFFFF)␊ |
| 1051 | ␉{␊ |
| 1052 | ␉␉//DBG("Replacing %s to point to 0x%x\n", symbol, newAddress);␊ |
| 1053 | ␉␉UInt32* jumpPointer = malloc(sizeof(UInt32*));␊ |
| 1054 | ␉␉char* binary = (char*)addr;␊ |
| 1055 | ␉␉*binary++ = 0xFF;␉// Jump␊ |
| 1056 | ␉␉*binary++ = 0x25;␉// Long Jump␊ |
| 1057 | ␉␉*((UInt32*)binary) = (UInt32)jumpPointer;␊ |
| 1058 | ␊ |
| 1059 | ␉␉*jumpPointer = (UInt32)newAddress;␊ |
| 1060 | ␉␉return 1;␊ |
| 1061 | ␉}␊ |
| 1062 | ␉return 0;␊ |
| 1063 | }␊ |
| 1064 | ␊ |
| 1065 | ␊ |
| 1066 | /*␊ |
| 1067 | *␉execute_hook( const char* name )␊ |
| 1068 | *␉␉name - Name of the module hook␊ |
| 1069 | *␉␉␉If any callbacks have been registered for this hook␊ |
| 1070 | *␉␉␉they will be executed now in the same order that the␊ |
| 1071 | *␉␉␉hooks were added.␊ |
| 1072 | */␊ |
| 1073 | int execute_hook(const char* name, void* arg1, void* arg2, void* arg3, void* arg4)␊ |
| 1074 | {␊ |
| 1075 | ␉DBG("Attempting to execute hook '%s'\n", name); DBGPAUSE();␊ |
| 1076 | ␉moduleHook_t* hook = hook_exists(name);␊ |
| 1077 | ␊ |
| 1078 | ␉if(hook)␊ |
| 1079 | ␉{␊ |
| 1080 | ␉␉// Loop through all callbacks for this module␊ |
| 1081 | ␉␉callbackList_t* callbacks = hook->callbacks;␊ |
| 1082 | ␊ |
| 1083 | ␉␉while(callbacks)␊ |
| 1084 | ␉␉{␊ |
| 1085 | ␉␉␉// Execute callback␊ |
| 1086 | ␉␉␉callbacks->callback(arg1, arg2, arg3, arg4);␊ |
| 1087 | ␉␉␉callbacks = callbacks->next;␊ |
| 1088 | ␉␉}␊ |
| 1089 | ␉␉DBG("Hook '%s' executed.\n", name); DBGPAUSE();␊ |
| 1090 | ␉␉return 1;␊ |
| 1091 | ␉}␊ |
| 1092 | ␉else␊ |
| 1093 | ␉{␊ |
| 1094 | ␉␉// Callback for this hook doesn't exist;␊ |
| 1095 | ␉␉DBG("No callbacks for '%s' hook.\n", name);␊ |
| 1096 | ␉␉return 0;␊ |
| 1097 | ␉}␊ |
| 1098 | }␊ |
| 1099 | ␊ |
| 1100 | ␊ |
| 1101 | ␊ |
| 1102 | /*␊ |
| 1103 | *␉register_hook_callback( const char* name, void(*callback)())␊ |
| 1104 | *␉␉name - Name of the module hook to attach to.␊ |
| 1105 | *␉␉callbacks - The funciton pointer that will be called when the␊ |
| 1106 | *␉␉␉hook is executed. When registering a new callback name, the callback is added sorted.␊ |
| 1107 | *␉␉␉NOTE: the hooks take four void* arguments.␊ |
| 1108 | */␊ |
| 1109 | void register_hook_callback(const char* name, void(*callback)(void*, void*, void*, void*))␊ |
| 1110 | {␊ |
| 1111 | ␉DBG("Adding callback for '%s' hook.\n", name); DBGPAUSE();␊ |
| 1112 | ␊ |
| 1113 | ␉moduleHook_t* hook = hook_exists(name);␊ |
| 1114 | ␊ |
| 1115 | ␉if(hook)␊ |
| 1116 | ␉{␊ |
| 1117 | ␉␉// append␊ |
| 1118 | ␉␉callbackList_t* newCallback = malloc(sizeof(callbackList_t));␊ |
| 1119 | ␉␉newCallback->next = hook->callbacks;␊ |
| 1120 | ␉␉hook->callbacks = newCallback;␊ |
| 1121 | ␉␉newCallback->callback = callback;␊ |
| 1122 | ␉}␊ |
| 1123 | ␉else␊ |
| 1124 | ␉{␊ |
| 1125 | ␉␉// create new hook␊ |
| 1126 | ␉␉moduleHook_t* newHook = malloc(sizeof(moduleHook_t));␊ |
| 1127 | ␉␉newHook->name = name;␊ |
| 1128 | ␉␉newHook->callbacks = malloc(sizeof(callbackList_t));␊ |
| 1129 | ␉␉newHook->callbacks->callback = callback;␊ |
| 1130 | ␉␉newHook->callbacks->next = NULL;␊ |
| 1131 | ␊ |
| 1132 | ␉␉newHook->next = moduleCallbacks;␊ |
| 1133 | ␉␉moduleCallbacks = newHook;␊ |
| 1134 | ␊ |
| 1135 | ␉}␊ |
| 1136 | ␊ |
| 1137 | #if CONFIG_MODULE_DEBUG␊ |
| 1138 | ␉//print_hook_list();␊ |
| 1139 | ␉//getchar();␊ |
| 1140 | #endif␊ |
| 1141 | ␊ |
| 1142 | }␊ |
| 1143 | ␊ |
| 1144 | ␊ |
| 1145 | moduleHook_t* hook_exists(const char* name)␊ |
| 1146 | {␊ |
| 1147 | ␉moduleHook_t* hooks = moduleCallbacks;␊ |
| 1148 | ␊ |
| 1149 | ␉// look for a hook. If it exists, return the moduleHook_t*,␊ |
| 1150 | ␉// If not, return NULL.␊ |
| 1151 | ␉while(hooks)␊ |
| 1152 | ␉{␊ |
| 1153 | ␉␉if(strcmp(name, hooks->name) == 0)␊ |
| 1154 | ␉␉{␊ |
| 1155 | ␉␉␉//DBG("Located hook %s\n", name);␊ |
| 1156 | ␉␉␉return hooks;␊ |
| 1157 | ␉␉}␊ |
| 1158 | ␉␉hooks = hooks->next;␊ |
| 1159 | ␉}␊ |
| 1160 | ␉//DBG("Hook %s does not exist\n", name);␊ |
| 1161 | ␉return NULL;␊ |
| 1162 | ␊ |
| 1163 | }␊ |
| 1164 | ␊ |
| 1165 | #if CONFIG_MODULE_DEBUG␊ |
| 1166 | void print_hook_list()␊ |
| 1167 | {␊ |
| 1168 | ␉printf("---Hook Table---\n");␊ |
| 1169 | ␊ |
| 1170 | ␉moduleHook_t* hooks = moduleCallbacks;␊ |
| 1171 | ␉while(hooks)␊ |
| 1172 | ␉{␊ |
| 1173 | ␉␉printf("Hook: %s\n", hooks->name);␊ |
| 1174 | ␉␉hooks = hooks->next;␊ |
| 1175 | ␉}␊ |
| 1176 | }␊ |
| 1177 | ␊ |
| 1178 | #endif␊ |
| 1179 | ␊ |
| 1180 | /********************************************************************************/␊ |
| 1181 | /*␉dyld / Linker Interface␉␉␉␉␉␉␉␉␉␉␉␉␉␉*/␊ |
| 1182 | /********************************************************************************/␊ |
| 1183 | ␊ |
| 1184 | void dyld_stub_binder()␊ |
| 1185 | {␊ |
| 1186 | ␉printf("ERROR: dyld_stub_binder was called, should have been take care of by the linker.\n");␊ |
| 1187 | ␉getchar();␊ |
| 1188 | }␊ |
| 1189 | ␊ |
| 1190 | #else /* CONFIG_MODULES */␊ |
| 1191 | ␊ |
| 1192 | int init_module_system()␊ |
| 1193 | {␊ |
| 1194 | return 0;␊ |
| 1195 | }␊ |
| 1196 | ␊ |
| 1197 | void load_all_modules()␊ |
| 1198 | {␊ |
| 1199 | ␊ |
| 1200 | }␊ |
| 1201 | ␊ |
| 1202 | int execute_hook(const char* name, void* arg1, void* arg2, void* arg3, void* arg4)␊ |
| 1203 | {␊ |
| 1204 | return 0;␊ |
| 1205 | }␊ |
| 1206 | ␊ |
| 1207 | void register_hook_callback(const char* name, void(*callback)(void*, void*, void*, void*))␊ |
| 1208 | {␊ |
| 1209 | ␉printf("WARNING: register_hook_callback is not supported when compiled in.\n");␊ |
| 1210 | ␉pause();␊ |
| 1211 | }␊ |
| 1212 | ␊ |
| 1213 | int replace_function(const char* symbol, void* newAddress)␊ |
| 1214 | {␊ |
| 1215 | ␉printf("WARNING: replace_functions is not supported when compiled in.\n");␊ |
| 1216 | ␉pause();␊ |
| 1217 | ␉return 0;␊ |
| 1218 | }␊ |
| 1219 | ␊ |
| 1220 | void start_built_in_module(const char* name,␊ |
| 1221 | const char* author,␊ |
| 1222 | const char* description,␊ |
| 1223 | UInt32 version,␊ |
| 1224 | UInt32 compat,␊ |
| 1225 | void(*start_function)(void))␊ |
| 1226 | {␊ |
| 1227 | start_function();␊ |
| 1228 | }␊ |
| 1229 | ␊ |
| 1230 | #endif␊ |
| 1231 | |
