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| Source at commit 430 created 13 years 7 months ago. By meklort, Removed unused code left over from before rebinding. Modified then handel_symtab function so that it can be used within the kernel patcher module. This is untested, other than to make sure it boots. | |
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| 1 | /*␊ |
| 2 | * Copyright 2010 Evan Lojewski. All rights reserved.␊ |
| 3 | *␊ |
| 4 | */␊ |
| 5 | ␊ |
| 6 | #include "boot.h"␊ |
| 7 | #include "bootstruct.h"␊ |
| 8 | #include "multiboot.h"␊ |
| 9 | #include "modules.h"␊ |
| 10 | ␊ |
| 11 | #ifndef DEBUG_MODULES␊ |
| 12 | #define DEBUG_MODULES 0␊ |
| 13 | #endif␊ |
| 14 | ␊ |
| 15 | #if DEBUG_MODULES␊ |
| 16 | #define DBG(x...)␉printf(x); getc()␊ |
| 17 | #else␊ |
| 18 | #define DBG(x...)␊ |
| 19 | #endif␊ |
| 20 | ␊ |
| 21 | ␊ |
| 22 | moduleHook_t* moduleCallbacks = NULL;␊ |
| 23 | moduleList_t* loadedModules = NULL;␊ |
| 24 | symbolList_t* moduleSymbols = NULL;␊ |
| 25 | unsigned int (*lookup_symbol)(const char*) = NULL;␊ |
| 26 | ␊ |
| 27 | ␊ |
| 28 | void rebase_macho(void* base, char* rebase_stream, UInt32 size);␊ |
| 29 | void bind_macho(void* base, char* bind_stream, UInt32 size);␊ |
| 30 | ␊ |
| 31 | ␊ |
| 32 | /*␊ |
| 33 | * Initialize the module system by loading the Symbols.dylib module.␊ |
| 34 | * Once laoded, locate the _lookup_symbol function so that internal␊ |
| 35 | * symbols can be resolved.␊ |
| 36 | */␊ |
| 37 | int init_module_system()␊ |
| 38 | {␊ |
| 39 | ␉// Intialize module system␊ |
| 40 | ␉if(load_module(SYMBOLS_MODULE))␊ |
| 41 | ␉{␊ |
| 42 | ␉␉lookup_symbol = (void*)lookup_all_symbols("_lookup_symbol");␊ |
| 43 | ␉␉␊ |
| 44 | ␉␉if((UInt32)lookup_symbol != 0xFFFFFFFF)␊ |
| 45 | ␉␉{␊ |
| 46 | ␉␉␉return 1;␊ |
| 47 | ␉␉}␊ |
| 48 | ␉␉␊ |
| 49 | ␉}␊ |
| 50 | ␉␊ |
| 51 | ␉return 0;␊ |
| 52 | }␊ |
| 53 | ␊ |
| 54 | ␊ |
| 55 | /*␊ |
| 56 | * Load all modules in the /Extra/modules/ directory␊ |
| 57 | * Module depencdies will be loaded first␊ |
| 58 | * MOdules will only be loaded once. When loaded a module must␊ |
| 59 | * setup apropriete function calls and hooks as required.␊ |
| 60 | * NOTE: To ensure a module loads after another you may ␊ |
| 61 | * link one module with the other. For dyld to allow this, you must␊ |
| 62 | * reference at least one symbol within the module.␊ |
| 63 | */␊ |
| 64 | void load_all_modules()␊ |
| 65 | {␊ |
| 66 | ␉char* name;␊ |
| 67 | ␉long flags;␊ |
| 68 | ␉long time;␊ |
| 69 | ␉struct dirstuff* moduleDir = opendir("/Extra/modules/");␊ |
| 70 | ␉while(readdir(moduleDir, (const char**)&name, &flags, &time) >= 0)␊ |
| 71 | ␉{␊ |
| 72 | ␉␉if(strcmp(&name[strlen(name) - sizeof("dylib")], ".dylib") == 0)␊ |
| 73 | ␉␉{␊ |
| 74 | ␉␉␉name[strlen(name) - sizeof("dylib")] = 0;␊ |
| 75 | ␉␉␉load_module(name);␊ |
| 76 | ␉␉}␊ |
| 77 | ␉}␊ |
| 78 | }␊ |
| 79 | ␊ |
| 80 | ␊ |
| 81 | /*␊ |
| 82 | * Load a module file in /Extra/modules␊ |
| 83 | * TODO: verify version number of module␊ |
| 84 | */␊ |
| 85 | int load_module(const char* module)␊ |
| 86 | {␊ |
| 87 | ␉// Check to see if the module has already been loaded␊ |
| 88 | ␉if(is_module_laoded(module))␊ |
| 89 | ␉{␊ |
| 90 | ␉␉return 1;␊ |
| 91 | ␉}␊ |
| 92 | ␉␊ |
| 93 | ␉char modString[128];␊ |
| 94 | ␉int fh = -1;␊ |
| 95 | ␉sprintf(modString, "/Extra/modules/%s.dylib", module);␊ |
| 96 | ␉fh = open(modString, 0);␊ |
| 97 | ␉if(fh < 0)␊ |
| 98 | ␉{␊ |
| 99 | ␉␉printf("Unable to locate module %s\n", modString);␊ |
| 100 | ␉␉getc();␊ |
| 101 | ␉␉return 0;␊ |
| 102 | ␉}␊ |
| 103 | ␉␊ |
| 104 | ␉unsigned int moduleSize = file_size(fh);␊ |
| 105 | ␉char* module_base = (char*) malloc(moduleSize);␊ |
| 106 | ␉if (read(fh, module_base, moduleSize) == moduleSize)␊ |
| 107 | ␉{␊ |
| 108 | ␉␉void (*module_start)(void) = NULL;␊ |
| 109 | ␊ |
| 110 | ␉␉//printf("Module %s read in.\n", modString);␊ |
| 111 | ␊ |
| 112 | ␉␉// Module loaded into memory, parse it␊ |
| 113 | ␉␉module_start = parse_mach(module_base);␊ |
| 114 | ␊ |
| 115 | ␉␉if(module_start)␊ |
| 116 | ␉␉{␊ |
| 117 | ␉␉␉(*module_start)();␉// Start the module␊ |
| 118 | ␉␉␉DBG("Module %s.dylib Loaded.\n", module);␊ |
| 119 | ␉␉}␊ |
| 120 | ␉␉else {␊ |
| 121 | ␉␉␉printf("Unabel to start %s.dylib\n", module);␊ |
| 122 | ␉␉␉getc();␊ |
| 123 | ␉␉}␊ |
| 124 | ␉␉// TODO: Add module to loaded list if loaded successfuly␊ |
| 125 | ␉␉␊ |
| 126 | ␉}␊ |
| 127 | ␉else␊ |
| 128 | ␉{␊ |
| 129 | ␉␉printf("Unable to read in module %s.dylib\n.", module);␊ |
| 130 | ␉␉getc();␊ |
| 131 | ␉}␊ |
| 132 | ␉return 1;␊ |
| 133 | }␊ |
| 134 | ␊ |
| 135 | ␊ |
| 136 | /*␊ |
| 137 | * register_hook( const char* name )␊ |
| 138 | *␉␉name - Name of the module Hook.␊ |
| 139 | *␉␉␉ NOTE: If the name already exists in the list, it'll␊ |
| 140 | *␉␉␉ still be added, however the entry will not be used, the first one␊ |
| 141 | *␉␉␉ will instead. That also means the the hook will most likely be␊ |
| 142 | *␉␉␉ called twice.␊ |
| 143 | *␊ |
| 144 | * Registers a hook with the module system, This allows modules to␊ |
| 145 | * register a callback when the hook is executed.␊ |
| 146 | */␊ |
| 147 | ␊ |
| 148 | inline void register_hook(const char* name)␊ |
| 149 | {␊ |
| 150 | ␉moduleHook_t* hooks;␊ |
| 151 | ␉if(moduleCallbacks == NULL)␊ |
| 152 | ␉{␊ |
| 153 | ␉␉moduleCallbacks = malloc(sizeof(moduleHook_t));␊ |
| 154 | ␉␉moduleCallbacks->next = NULL;␊ |
| 155 | ␉}␊ |
| 156 | ␉␊ |
| 157 | ␉hooks = moduleCallbacks;␊ |
| 158 | ␉while(hooks->next != NULL)␊ |
| 159 | ␉{␊ |
| 160 | ␉␉hooks = hooks->next;␊ |
| 161 | ␉}␊ |
| 162 | ␉␊ |
| 163 | ␉␊ |
| 164 | ␉hooks->name = name;␊ |
| 165 | ␉hooks->callbacks = NULL;␊ |
| 166 | }␊ |
| 167 | ␊ |
| 168 | ␊ |
| 169 | /*␊ |
| 170 | *␉execute_hook( const char* name )␊ |
| 171 | *␉␉name - Name of the module hook␊ |
| 172 | *␉␉␉If any callbacks have been registered for this hook␊ |
| 173 | *␉␉␉they will be executed now in the same order that the␊ |
| 174 | *␉␉␉hooks were added.␊ |
| 175 | */␊ |
| 176 | int execute_hook(const char* name, void* arg1, void* arg2, void* arg3, void* arg4)␊ |
| 177 | {␊ |
| 178 | ␉DBG("Attempting to execute hook '%s'\n", name);␊ |
| 179 | ␊ |
| 180 | ␉if(moduleCallbacks != NULL)␊ |
| 181 | ␉{␊ |
| 182 | ␉␉moduleHook_t* hooks = moduleCallbacks;␊ |
| 183 | ␉␉␊ |
| 184 | ␉␉while(hooks != NULL && strcmp(name, hooks->name) != 0)␊ |
| 185 | ␉␉{␊ |
| 186 | ␉␉␉hooks = hooks->next;␊ |
| 187 | ␉␉}␊ |
| 188 | ␉␉␊ |
| 189 | ␉␉if(hooks != NULL)␊ |
| 190 | ␉␉{␊ |
| 191 | ␉␉␉// Loop through all callbacks for this module␊ |
| 192 | ␉␉␉callbackList_t* callbacks = hooks->callbacks;␊ |
| 193 | ␉␉␉␊ |
| 194 | ␉␉␉while(callbacks)␊ |
| 195 | ␉␉␉{␊ |
| 196 | ␉␉␉␉// Execute callback␊ |
| 197 | ␉␉␉␉callbacks->callback(arg1, arg2, arg3, arg4);␊ |
| 198 | ␉␉␉␉callbacks = callbacks->next;␊ |
| 199 | ␉␉␉}␊ |
| 200 | ␉␉␉DBG("Hook '%s' executed.\n", name);␊ |
| 201 | ␊ |
| 202 | ␉␉␉return 1;␊ |
| 203 | ␉␉}␊ |
| 204 | ␉␉else␊ |
| 205 | ␉␉{␊ |
| 206 | ␉␉␉DBG("No callbacks for '%s' hook.\n", name);␊ |
| 207 | ␊ |
| 208 | ␉␉␉// Callbaack for this module doesn't exist;␊ |
| 209 | ␉␉␉//verbose("Unable execute hook '%s', no callbacks registered.\n", name);␊ |
| 210 | ␉␉␉//pause();␊ |
| 211 | ␉␉␉return 0;␊ |
| 212 | ␉␉}␊ |
| 213 | ␊ |
| 214 | ␊ |
| 215 | ␉}␉␊ |
| 216 | ␉DBG("No hooks have been registered.\n", name);␊ |
| 217 | ␉return 0;␊ |
| 218 | }␊ |
| 219 | ␊ |
| 220 | ␊ |
| 221 | ␊ |
| 222 | /*␊ |
| 223 | *␉register_hook_callback( const char* name, void(*callback)())␊ |
| 224 | *␉␉name - Name of the module hook to attach to.␊ |
| 225 | *␉␉callbacks - The funciton pointer that will be called when the␊ |
| 226 | *␉␉␉hook is executed.␊ |
| 227 | *␉␉␉NOTE: the hooks take four void* arguments.␊ |
| 228 | */␊ |
| 229 | /*␊ |
| 230 | void register_hook_callback(const char* name,␊ |
| 231 | ␉␉␉␉␉␉␉void(*callback)(void*, void*, void*, void*),␊ |
| 232 | ␉␉␉␉␉␉␉)*/␊ |
| 233 | void register_hook_callback(const char* name, void(*callback)(void*, void*, void*, void*))␊ |
| 234 | {␊ |
| 235 | ␉// Locate Module hook␊ |
| 236 | ␉if(moduleCallbacks == NULL)␊ |
| 237 | ␉{␊ |
| 238 | ␉␉register_hook(name);␊ |
| 239 | ␉}␊ |
| 240 | ␉volatile moduleHook_t* hooks = moduleCallbacks;␊ |
| 241 | ␉␊ |
| 242 | ␉while(hooks != NULL && strcmp(name, hooks->name) != 0)␊ |
| 243 | ␉{␊ |
| 244 | ␉␉hooks = hooks->next;␊ |
| 245 | ␉}␊ |
| 246 | ␉␊ |
| 247 | ␉if(hooks == NULL)␊ |
| 248 | ␉{␊ |
| 249 | ␉␉// Hook doesn't exist, add it.␊ |
| 250 | ␉␉register_hook(name);␊ |
| 251 | ␉␉␊ |
| 252 | ␉␉// This is just a pointer, the data was modified in the register_hook function.␊ |
| 253 | ␉␉hooks = hooks->next;␊ |
| 254 | ␉}␊ |
| 255 | ␉␊ |
| 256 | ␉// Module Hooks located␊ |
| 257 | ␉if(hooks->callbacks == NULL)␊ |
| 258 | ␉{␊ |
| 259 | ␉␉// Initialize hook list␊ |
| 260 | ␉␉hooks->callbacks = (callbackList_t*)malloc(sizeof(callbackList_t));␊ |
| 261 | ␉␉hooks->callbacks->callback = callback;␊ |
| 262 | ␉␉hooks->callbacks->next = NULL;␊ |
| 263 | ␉}␊ |
| 264 | ␉else␊ |
| 265 | ␉{␊ |
| 266 | ␉␉callbackList_t* callbacks = hooks->callbacks;␊ |
| 267 | ␉␉while(callbacks->next != NULL)␊ |
| 268 | ␉␉{␊ |
| 269 | ␉␉␉callbacks = callbacks->next;␊ |
| 270 | ␉␉}␊ |
| 271 | ␉␉// Add new entry to end of hook list.␊ |
| 272 | ␉␉callbacks->next = (callbackList_t*)malloc(sizeof(callbackList_t));␊ |
| 273 | ␉␉callbacks = callbacks->next;␊ |
| 274 | ␉␉callbacks->next = NULL;␊ |
| 275 | ␉␉callbacks->callback = callback;␊ |
| 276 | ␉}␊ |
| 277 | }␊ |
| 278 | ␊ |
| 279 | ␊ |
| 280 | ␊ |
| 281 | /*␊ |
| 282 | * Parse through a macho module. The module will be rebased and binded␊ |
| 283 | * as specified in the macho header. If the module is sucessfuly laoded␊ |
| 284 | * the module iinit address will be returned.␊ |
| 285 | * NOTE; all dependecies will be loaded before this module is started␊ |
| 286 | * NOTE: If the module is unable to load ot completeion, the modules␊ |
| 287 | * symbols will still be available (TODO: fix this). This should not␊ |
| 288 | * happen as all dependencies are verified before the sybols are read in.␊ |
| 289 | */␊ |
| 290 | void* parse_mach(void* binary)␊ |
| 291 | {␉␊ |
| 292 | ␉void (*module_start)(void) = NULL;␊ |
| 293 | ␊ |
| 294 | ␉// Module info␊ |
| 295 | ␉char* moduleName = NULL;␊ |
| 296 | ␉UInt32 moduleVersion = 0;␊ |
| 297 | ␉UInt32 moduleCompat = 0;␊ |
| 298 | ␉␊ |
| 299 | ␉// TODO convert all of the structs to a union␊ |
| 300 | ␉struct load_command *loadCommand = NULL;␊ |
| 301 | ␉struct dylib_command* dylibCommand = NULL;␊ |
| 302 | ␉struct dyld_info_command* dyldInfoCommand = NULL;␊ |
| 303 | ␉struct symtab_command* symtabCommand = NULL;␊ |
| 304 | ␉//struct dysymtab_command* dysymtabCommand = NULL;␊ |
| 305 | ␉UInt32 binaryIndex = sizeof(struct mach_header);␊ |
| 306 | ␉UInt16 cmd = 0;␊ |
| 307 | ␊ |
| 308 | ␉// Parse through the load commands␊ |
| 309 | ␉if(((struct mach_header*)binary)->magic != MH_MAGIC)␊ |
| 310 | ␉{␊ |
| 311 | ␉␉printf("Module is not 32bit\n");␊ |
| 312 | ␉␉getc();␊ |
| 313 | ␉␉return NULL;␉// 32bit only␊ |
| 314 | ␉}␊ |
| 315 | ␉␊ |
| 316 | ␉if(((struct mach_header*)binary)->filetype != MH_DYLIB)␊ |
| 317 | ␉{␊ |
| 318 | ␉␉printf("Module is not a dylib. Unable to load.\n");␊ |
| 319 | ␉␉getc();␊ |
| 320 | ␉␉return NULL; // Module is in the incorrect format␊ |
| 321 | ␉}␊ |
| 322 | ␉␊ |
| 323 | ␉while(cmd < ((struct mach_header*)binary)->ncmds)␉// TODO: for loop instead␊ |
| 324 | ␉{␊ |
| 325 | ␉␉cmd++;␊ |
| 326 | ␉␉␊ |
| 327 | ␉␉loadCommand = binary + binaryIndex;␊ |
| 328 | ␉␉UInt32 cmdSize = loadCommand->cmdsize;␊ |
| 329 | ␊ |
| 330 | ␉␉␊ |
| 331 | ␉␉switch ((loadCommand->cmd & 0x7FFFFFFF))␊ |
| 332 | ␉␉{␊ |
| 333 | ␉␉␉case LC_SYMTAB:␊ |
| 334 | ␉␉␉␉symtabCommand = binary + binaryIndex;␊ |
| 335 | ␉␉␉␉break;␊ |
| 336 | ␉␉␉case LC_SEGMENT:␊ |
| 337 | ␉␉␉␉break;␊ |
| 338 | ␉␉␉␉␊ |
| 339 | ␉␉␉case LC_DYSYMTAB:␊ |
| 340 | ␉␉␉␉break;␊ |
| 341 | ␉␉␉␉␊ |
| 342 | ␉␉␉case LC_LOAD_DYLIB:␊ |
| 343 | ␉␉␉case LC_LOAD_WEAK_DYLIB ^ LC_REQ_DYLD:␊ |
| 344 | ␉␉␉␉dylibCommand = binary + binaryIndex;␊ |
| 345 | ␉␉␉␉char* module = binary + binaryIndex + ((UInt32)*((UInt32*)&dylibCommand->dylib.name));␊ |
| 346 | ␉␉␉␉// TODO: verify version␊ |
| 347 | ␉␉␉␉// =␉dylibCommand->dylib.current_version;␊ |
| 348 | ␉␉␉␉// =␉dylibCommand->dylib.compatibility_version;␊ |
| 349 | ␊ |
| 350 | ␉␉␉␉if(!load_module(module))␊ |
| 351 | ␉␉␉␉{␊ |
| 352 | ␉␉␉␉␉// Unable to load dependancy␊ |
| 353 | ␉␉␉␉␉return NULL;␊ |
| 354 | ␉␉␉␉}␊ |
| 355 | ␉␉␉␉break;␊ |
| 356 | ␉␉␉␉␊ |
| 357 | ␉␉␉case LC_ID_DYLIB:␊ |
| 358 | ␉␉␉␉dylibCommand = binary + binaryIndex;␊ |
| 359 | ␉␉␉␉moduleName =␉binary + binaryIndex + ((UInt32)*((UInt32*)&dylibCommand->dylib.name));␊ |
| 360 | ␉␉␉␉moduleVersion =␉dylibCommand->dylib.current_version;␊ |
| 361 | ␉␉␉␉moduleCompat =␉dylibCommand->dylib.compatibility_version;␊ |
| 362 | ␉␉␉␉break;␊ |
| 363 | ␊ |
| 364 | ␉␉␉case LC_DYLD_INFO:␊ |
| 365 | ␉␉␉␉// Bind and rebase info is stored here␊ |
| 366 | ␉␉␉␉dyldInfoCommand = binary + binaryIndex;␊ |
| 367 | ␉␉␉␉break;␊ |
| 368 | ␉␉␉␉␊ |
| 369 | ␉␉␉case LC_UUID:␊ |
| 370 | ␉␉␉␉break;␊ |
| 371 | ␉␉␉␉␊ |
| 372 | ␉␉␉default:␊ |
| 373 | ␉␉␉␉DBG("Unhandled loadcommand 0x%X\n", loadCommand->cmd & 0x7FFFFFFF);␊ |
| 374 | ␉␉␉␉break;␊ |
| 375 | ␉␉␊ |
| 376 | ␉␉}␊ |
| 377 | ␊ |
| 378 | ␉␉binaryIndex += cmdSize;␊ |
| 379 | ␉}␊ |
| 380 | ␉if(!moduleName) return NULL;␊ |
| 381 | ␉␉␊ |
| 382 | ␊ |
| 383 | ␉// bind_macho uses the symbols.␊ |
| 384 | ␉module_start = (void*)handle_symtable((UInt32)binary, symtabCommand, &add_symbol);␊ |
| 385 | ␊ |
| 386 | ␉// Rebase the module before binding it.␊ |
| 387 | ␉if(dyldInfoCommand && dyldInfoCommand->rebase_off)␊ |
| 388 | ␉{␊ |
| 389 | ␉␉rebase_macho(binary, (char*)dyldInfoCommand->rebase_off, dyldInfoCommand->rebase_size);␊ |
| 390 | ␉}␊ |
| 391 | ␉␊ |
| 392 | ␉if(dyldInfoCommand && dyldInfoCommand->bind_off)␊ |
| 393 | ␉{␊ |
| 394 | ␉␉bind_macho(binary, (char*)dyldInfoCommand->bind_off, dyldInfoCommand->bind_size);␊ |
| 395 | ␉}␊ |
| 396 | ␉␊ |
| 397 | ␉if(dyldInfoCommand && dyldInfoCommand->weak_bind_off)␊ |
| 398 | ␉{␊ |
| 399 | ␉␉// NOTE: this currently should never happen.␊ |
| 400 | ␉␉bind_macho(binary, (char*)dyldInfoCommand->weak_bind_off, dyldInfoCommand->weak_bind_size);␊ |
| 401 | ␉}␊ |
| 402 | ␉␊ |
| 403 | ␉if(dyldInfoCommand && dyldInfoCommand->lazy_bind_off)␊ |
| 404 | ␉{␊ |
| 405 | ␉␉// NOTE: we are binding the lazy pointers as a module is laoded,␊ |
| 406 | ␉␉// This should be changed to bind when a symbol is referened at runtime instead.␊ |
| 407 | ␉␉bind_macho(binary, (char*)dyldInfoCommand->lazy_bind_off, dyldInfoCommand->lazy_bind_size);␊ |
| 408 | ␉}␊ |
| 409 | ␉␊ |
| 410 | ␊ |
| 411 | ␉␊ |
| 412 | ␊ |
| 413 | ␉// Notify the system that it was laoded␊ |
| 414 | ␉module_loaded(moduleName, moduleVersion, moduleCompat);␊ |
| 415 | ␉␊ |
| 416 | ␉return module_start;␊ |
| 417 | ␉␊ |
| 418 | }␊ |
| 419 | ␊ |
| 420 | ␊ |
| 421 | // Based on code from dylibinfo.cpp and ImageLoaderMachOCompressed.cpp␊ |
| 422 | void rebase_macho(void* base, char* rebase_stream, UInt32 size)␊ |
| 423 | {␊ |
| 424 | ␉rebase_stream += (UInt32)base;␊ |
| 425 | ␉␊ |
| 426 | ␉UInt8 immediate = 0;␊ |
| 427 | ␉UInt8 opcode = 0;␊ |
| 428 | ␉UInt8 type = 0;␊ |
| 429 | ␉␊ |
| 430 | ␉UInt32 segmentAddress = 0;␊ |
| 431 | ␉␊ |
| 432 | ␉␊ |
| 433 | ␉␊ |
| 434 | ␉UInt32 tmp = 0;␊ |
| 435 | ␉UInt32 tmp2 = 0;␊ |
| 436 | ␉UInt8 bits = 0;␊ |
| 437 | ␉int index = 0;␊ |
| 438 | ␉␊ |
| 439 | ␉int done = 0;␊ |
| 440 | ␉unsigned int i = 0;␊ |
| 441 | ␉␊ |
| 442 | ␉while(/*!done &&*/ i < size)␊ |
| 443 | ␉{␊ |
| 444 | ␉␉immediate = rebase_stream[i] & REBASE_IMMEDIATE_MASK;␊ |
| 445 | ␉␉opcode = rebase_stream[i] & REBASE_OPCODE_MASK;␊ |
| 446 | ␊ |
| 447 | ␉␉␊ |
| 448 | ␉␉switch(opcode)␊ |
| 449 | ␉␉{␊ |
| 450 | ␉␉␉case REBASE_OPCODE_DONE:␊ |
| 451 | ␉␉␉␉// Rebase complete.␊ |
| 452 | ␉␉␉␉done = 1;␊ |
| 453 | ␉␉␉␉break;␊ |
| 454 | ␉␉␉␉␊ |
| 455 | ␉␉␉␉␊ |
| 456 | ␉␉␉case REBASE_OPCODE_SET_TYPE_IMM:␊ |
| 457 | ␉␉␉␉// Set rebase type (pointer, absolute32, pcrel32)␊ |
| 458 | ␉␉␉␉//printf("Rebase type = 0x%X\n", immediate);␊ |
| 459 | ␉␉␉␉// NOTE: This is currently NOT used␊ |
| 460 | ␉␉␉␉type = immediate;␊ |
| 461 | ␉␉␉␉break;␊ |
| 462 | ␉␉␉␉␊ |
| 463 | ␉␉␉␉␊ |
| 464 | ␉␉␉case REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:␊ |
| 465 | ␉␉␉␉// Locate address to begin rebasing␊ |
| 466 | ␉␉␉␉segmentAddress = 0;␊ |
| 467 | ␊ |
| 468 | ␉␉␉␉struct segment_command* segCommand = NULL;␊ |
| 469 | ␉␉␉␉␊ |
| 470 | ␉␉␉␉unsigned int binIndex = 0;␊ |
| 471 | ␉␉␉␉index = 0;␊ |
| 472 | ␉␉␉␉do␊ |
| 473 | ␉␉␉␉{␊ |
| 474 | ␉␉␉␉␉segCommand = base + sizeof(struct mach_header) + binIndex;␊ |
| 475 | ␉␉␉␉␉␊ |
| 476 | ␉␉␉␉␉␊ |
| 477 | ␉␉␉␉␉binIndex += segCommand->cmdsize;␊ |
| 478 | ␉␉␉␉␉index++;␊ |
| 479 | ␉␉␉␉}␊ |
| 480 | ␉␉␉␉while(index <= immediate);␊ |
| 481 | ␊ |
| 482 | ␊ |
| 483 | ␉␉␉␉segmentAddress = segCommand->fileoff;␊ |
| 484 | ␉␉␉␉␊ |
| 485 | ␉␉␉␉tmp = 0;␊ |
| 486 | ␉␉␉␉bits = 0;␊ |
| 487 | ␉␉␉␉do␊ |
| 488 | ␉␉␉␉{␊ |
| 489 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
| 490 | ␉␉␉␉␉bits += 7;␊ |
| 491 | ␉␉␉␉}␊ |
| 492 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
| 493 | ␉␉␉␉␊ |
| 494 | ␉␉␉␉segmentAddress += tmp;␊ |
| 495 | ␉␉␉␉break;␊ |
| 496 | ␉␉␉␉␊ |
| 497 | ␉␉␉␉␊ |
| 498 | ␉␉␉case REBASE_OPCODE_ADD_ADDR_ULEB:␊ |
| 499 | ␉␉␉␉// Add value to rebase address␊ |
| 500 | ␉␉␉␉tmp = 0;␊ |
| 501 | ␉␉␉␉bits = 0;␊ |
| 502 | ␉␉␉␉do␊ |
| 503 | ␉␉␉␉{␊ |
| 504 | ␉␉␉␉␉tmp <<= bits;␊ |
| 505 | ␉␉␉␉␉tmp |= rebase_stream[++i] & 0x7f;␊ |
| 506 | ␉␉␉␉␉bits += 7;␊ |
| 507 | ␉␉␉␉}␊ |
| 508 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
| 509 | ␉␉␉␉␊ |
| 510 | ␉␉␉␉segmentAddress +=␉tmp; ␊ |
| 511 | ␉␉␉␉break;␊ |
| 512 | ␉␉␉␉␊ |
| 513 | ␉␉␉case REBASE_OPCODE_ADD_ADDR_IMM_SCALED:␊ |
| 514 | ␉␉␉␉segmentAddress += immediate * sizeof(void*);␊ |
| 515 | ␉␉␉␉break;␊ |
| 516 | ␉␉␉␉␊ |
| 517 | ␉␉␉␉␊ |
| 518 | ␉␉␉case REBASE_OPCODE_DO_REBASE_IMM_TIMES:␊ |
| 519 | ␉␉␉␉index = 0;␊ |
| 520 | ␉␉␉␉for (index = 0; index < immediate; ++index) {␊ |
| 521 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base);␊ |
| 522 | ␉␉␉␉␉segmentAddress += sizeof(void*);␊ |
| 523 | ␉␉␉␉}␊ |
| 524 | ␉␉␉␉break;␊ |
| 525 | ␉␉␉␊ |
| 526 | ␉␉␉␉␊ |
| 527 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ULEB_TIMES:␊ |
| 528 | ␉␉␉␉tmp = 0;␊ |
| 529 | ␉␉␉␉bits = 0;␊ |
| 530 | ␉␉␉␉do␊ |
| 531 | ␉␉␉␉{␊ |
| 532 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
| 533 | ␉␉␉␉␉bits += 7;␊ |
| 534 | ␉␉␉␉}␊ |
| 535 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
| 536 | ␉␉␉␉␊ |
| 537 | ␉␉␉␉index = 0;␊ |
| 538 | ␉␉␉␉for (index = 0; index < tmp; ++index) {␊ |
| 539 | ␉␉␉␉␉//printf("\tRebasing 0x%X\n", segmentAddress);␊ |
| 540 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base);␉␉␉␉␉␊ |
| 541 | ␉␉␉␉␉segmentAddress += sizeof(void*);␊ |
| 542 | ␉␉␉␉}␊ |
| 543 | ␉␉␉␉break;␊ |
| 544 | ␉␉␉␉␊ |
| 545 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB:␊ |
| 546 | ␉␉␉␉tmp = 0;␊ |
| 547 | ␉␉␉␉bits = 0;␊ |
| 548 | ␉␉␉␉do␊ |
| 549 | ␉␉␉␉{␊ |
| 550 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
| 551 | ␉␉␉␉␉bits += 7;␊ |
| 552 | ␉␉␉␉}␊ |
| 553 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
| 554 | ␉␉␉␉␊ |
| 555 | ␉␉␉␉rebase_location(base + segmentAddress, (char*)base);␊ |
| 556 | ␉␉␉␉␊ |
| 557 | ␉␉␉␉segmentAddress += tmp + sizeof(void*);␊ |
| 558 | ␉␉␉␉break;␊ |
| 559 | ␉␉␉␉␊ |
| 560 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB:␊ |
| 561 | ␉␉␉␉tmp = 0;␊ |
| 562 | ␉␉␉␉bits = 0;␊ |
| 563 | ␉␉␉␉do␊ |
| 564 | ␉␉␉␉{␊ |
| 565 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
| 566 | ␉␉␉␉␉bits += 7;␊ |
| 567 | ␉␉␉␉}␊ |
| 568 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
| 569 | ␉␉␉␉␊ |
| 570 | ␉␉␉␉␊ |
| 571 | ␉␉␉␉tmp2 = 0;␊ |
| 572 | ␉␉␉␉bits = 0;␊ |
| 573 | ␉␉␉␉do␊ |
| 574 | ␉␉␉␉{␊ |
| 575 | ␉␉␉␉␉tmp2 |= (rebase_stream[++i] & 0x7f) << bits;␊ |
| 576 | ␉␉␉␉␉bits += 7;␊ |
| 577 | ␉␉␉␉}␊ |
| 578 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
| 579 | ␉␉␉␉␊ |
| 580 | ␉␉␉␉index = 0;␊ |
| 581 | ␉␉␉␉for (index = 0; index < tmp; ++index) {␊ |
| 582 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base);␊ |
| 583 | ␉␉␉␉␉␊ |
| 584 | ␉␉␉␉␉segmentAddress += tmp2 + sizeof(void*);␊ |
| 585 | ␉␉␉␉}␊ |
| 586 | ␉␉␉␉break;␊ |
| 587 | ␉␉}␊ |
| 588 | ␉␉i++;␊ |
| 589 | ␉}␊ |
| 590 | }␊ |
| 591 | ␊ |
| 592 | // Based on code from dylibinfo.cpp and ImageLoaderMachOCompressed.cpp␊ |
| 593 | // NOTE: this uses 32bit values, and not 64bit values. ␊ |
| 594 | // There is apossibility that this could cause issues,␊ |
| 595 | // however the macho file is 32 bit, so it shouldn't matter too much␊ |
| 596 | void bind_macho(void* base, char* bind_stream, UInt32 size)␊ |
| 597 | {␉␊ |
| 598 | ␉bind_stream += (UInt32)base;␊ |
| 599 | ␉␊ |
| 600 | ␉UInt8 immediate = 0;␊ |
| 601 | ␉UInt8 opcode = 0;␊ |
| 602 | ␉UInt8 type = 0;␊ |
| 603 | ␉␊ |
| 604 | ␉UInt32 segmentAddress = 0;␊ |
| 605 | ␉␊ |
| 606 | ␉UInt32 address = 0;␊ |
| 607 | ␉␊ |
| 608 | ␉SInt32 addend = 0;␉␉␉// TODO: handle this␊ |
| 609 | ␉SInt32 libraryOrdinal = 0;␊ |
| 610 | ␊ |
| 611 | ␉const char* symbolName = NULL;␊ |
| 612 | ␉UInt8 symboFlags = 0;␊ |
| 613 | ␉UInt32 symbolAddr = 0xFFFFFFFF;␊ |
| 614 | ␉␊ |
| 615 | ␉// Temperary variables␊ |
| 616 | ␉UInt8 bits = 0;␊ |
| 617 | ␉UInt32 tmp = 0;␊ |
| 618 | ␉UInt32 tmp2 = 0;␊ |
| 619 | ␉␊ |
| 620 | ␉UInt32 index = 0;␊ |
| 621 | ␉int done = 0;␊ |
| 622 | ␉unsigned int i = 0;␊ |
| 623 | ␉␊ |
| 624 | ␉while(/*!done &&*/ i < size)␊ |
| 625 | ␉{␊ |
| 626 | ␉␉immediate = bind_stream[i] & BIND_IMMEDIATE_MASK;␊ |
| 627 | ␉␉opcode = bind_stream[i] & BIND_OPCODE_MASK;␊ |
| 628 | ␉␉␊ |
| 629 | ␉␉␊ |
| 630 | ␉␉switch(opcode)␊ |
| 631 | ␉␉{␊ |
| 632 | ␉␉␉case BIND_OPCODE_DONE:␊ |
| 633 | ␉␉␉␉done = 1; ␊ |
| 634 | ␉␉␉␉break;␊ |
| 635 | ␉␉␉␉␊ |
| 636 | ␉␉␉case BIND_OPCODE_SET_DYLIB_ORDINAL_IMM:␊ |
| 637 | ␉␉␉␉libraryOrdinal = immediate;␊ |
| 638 | ␉␉␉␉//DBG("BIND_OPCODE_SET_DYLIB_ORDINAL_IMM: %d\n", libraryOrdinal);␊ |
| 639 | ␉␉␉␉break;␊ |
| 640 | ␉␉␉␉␊ |
| 641 | ␉␉␉case BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB:␊ |
| 642 | ␉␉␉␉libraryOrdinal = 0;␊ |
| 643 | ␉␉␉␉bits = 0;␊ |
| 644 | ␉␉␉␉do␊ |
| 645 | ␉␉␉␉{␊ |
| 646 | ␉␉␉␉␉libraryOrdinal |= (bind_stream[++i] & 0x7f) << bits;␊ |
| 647 | ␉␉␉␉␉bits += 7;␊ |
| 648 | ␉␉␉␉}␊ |
| 649 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
| 650 | ␉␉␉␉␊ |
| 651 | ␉␉␉␉//DBG("BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB: %d\n", libraryOrdinal);␊ |
| 652 | ␊ |
| 653 | ␉␉␉␉break;␊ |
| 654 | ␉␉␉␉␊ |
| 655 | ␉␉␉case BIND_OPCODE_SET_DYLIB_SPECIAL_IMM:␊ |
| 656 | ␉␉␉␉// NOTE: this is wrong, fortunately we don't use it␊ |
| 657 | ␉␉␉␉libraryOrdinal = -immediate;␊ |
| 658 | ␉␉␉␉//DBG("BIND_OPCODE_SET_DYLIB_SPECIAL_IMM: %d\n", libraryOrdinal);␊ |
| 659 | ␊ |
| 660 | ␉␉␉␉break;␊ |
| 661 | ␉␉␉␉␊ |
| 662 | ␉␉␉case BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:␊ |
| 663 | ␉␉␉␉symboFlags = immediate;␊ |
| 664 | ␉␉␉␉symbolName = (char*)&bind_stream[++i];␊ |
| 665 | ␉␉␉␉i += strlen((char*)&bind_stream[i]);␊ |
| 666 | ␉␉␉␉//DBG("BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM: %s, 0x%X\n", symbolName, symboFlags);␊ |
| 667 | ␊ |
| 668 | ␉␉␉␉symbolAddr = lookup_all_symbols(symbolName);␊ |
| 669 | ␊ |
| 670 | ␉␉␉␉break;␊ |
| 671 | ␉␉␉␉␊ |
| 672 | ␉␉␉case BIND_OPCODE_SET_TYPE_IMM:␊ |
| 673 | ␉␉␉␉// Set bind type (pointer, absolute32, pcrel32)␊ |
| 674 | ␉␉␉␉type = immediate;␊ |
| 675 | ␉␉␉␉//DBG("BIND_OPCODE_SET_TYPE_IMM: %d\n", type);␊ |
| 676 | ␊ |
| 677 | ␉␉␉␉break;␊ |
| 678 | ␉␉␉␉␊ |
| 679 | ␉␉␉case BIND_OPCODE_SET_ADDEND_SLEB:␊ |
| 680 | ␉␉␉␉addend = 0;␊ |
| 681 | ␉␉␉␉bits = 0;␊ |
| 682 | ␉␉␉␉do␊ |
| 683 | ␉␉␉␉{␊ |
| 684 | ␉␉␉␉␉addend |= (bind_stream[++i] & 0x7f) << bits;␊ |
| 685 | ␉␉␉␉␉bits += 7;␊ |
| 686 | ␉␉␉␉}␊ |
| 687 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
| 688 | ␉␉␉␉␊ |
| 689 | ␉␉␉␉if(!(bind_stream[i-1] & 0x40)) addend *= -1;␊ |
| 690 | ␉␉␉␉␊ |
| 691 | ␉␉␉␉//DBG("BIND_OPCODE_SET_ADDEND_SLEB: %d\n", addend);␊ |
| 692 | ␉␉␉␉break;␊ |
| 693 | ␉␉␉␉␊ |
| 694 | ␉␉␉case BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:␊ |
| 695 | ␉␉␉␉segmentAddress = 0;␊ |
| 696 | ␊ |
| 697 | ␉␉␉␉// Locate address␊ |
| 698 | ␉␉␉␉struct segment_command* segCommand = NULL;␊ |
| 699 | ␉␉␉␉␊ |
| 700 | ␉␉␉␉unsigned int binIndex = 0;␊ |
| 701 | ␉␉␉␉index = 0;␊ |
| 702 | ␉␉␉␉do␊ |
| 703 | ␉␉␉␉{␊ |
| 704 | ␉␉␉␉␉segCommand = base + sizeof(struct mach_header) + binIndex;␊ |
| 705 | ␉␉␉␉␉binIndex += segCommand->cmdsize;␊ |
| 706 | ␉␉␉␉␉index++;␊ |
| 707 | ␉␉␉␉}␊ |
| 708 | ␉␉␉␉while(index <= immediate);␊ |
| 709 | ␉␉␉␉␊ |
| 710 | ␉␉␉␉segmentAddress = segCommand->fileoff;␊ |
| 711 | ␉␉␉␉␊ |
| 712 | ␉␉␉␉// Read in offset␊ |
| 713 | ␉␉␉␉tmp = 0;␊ |
| 714 | ␉␉␉␉bits = 0;␊ |
| 715 | ␉␉␉␉do␊ |
| 716 | ␉␉␉␉{␊ |
| 717 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
| 718 | ␉␉␉␉␉bits += 7;␊ |
| 719 | ␉␉␉␉}␊ |
| 720 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
| 721 | ␉␉␉␉␊ |
| 722 | ␉␉␉␉segmentAddress += tmp;␊ |
| 723 | ␉␉␉␉␊ |
| 724 | ␉␉␉␉//DBG("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: 0x%X\n", segmentAddress);␊ |
| 725 | ␉␉␉␉break;␊ |
| 726 | ␉␉␉␉␊ |
| 727 | ␉␉␉case BIND_OPCODE_ADD_ADDR_ULEB:␊ |
| 728 | ␉␉␉␉// Read in offset␊ |
| 729 | ␉␉␉␉tmp = 0;␊ |
| 730 | ␉␉␉␉bits = 0;␊ |
| 731 | ␉␉␉␉do␊ |
| 732 | ␉␉␉␉{␊ |
| 733 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
| 734 | ␉␉␉␉␉bits += 7;␊ |
| 735 | ␉␉␉␉}␊ |
| 736 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
| 737 | ␉␉␉␉␊ |
| 738 | ␉␉␉␉segmentAddress += tmp;␊ |
| 739 | ␉␉␉␉//DBG("BIND_OPCODE_ADD_ADDR_ULEB: 0x%X\n", segmentAddress);␊ |
| 740 | ␉␉␉␉break;␊ |
| 741 | ␉␉␉␉␊ |
| 742 | ␉␉␉case BIND_OPCODE_DO_BIND:␊ |
| 743 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND\n");␊ |
| 744 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
| 745 | ␉␉␉␉{␊ |
| 746 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
| 747 | ␊ |
| 748 | ␉␉␉␉␉((char*)address)[0] = (symbolAddr & 0x000000FF) >> 0;␊ |
| 749 | ␉␉␉␉␉((char*)address)[1] = (symbolAddr & 0x0000FF00) >> 8;␊ |
| 750 | ␉␉␉␉␉((char*)address)[2] = (symbolAddr & 0x00FF0000) >> 16;␊ |
| 751 | ␉␉␉␉␉((char*)address)[3] = (symbolAddr & 0xFF000000) >> 24;␊ |
| 752 | ␉␉␉␉}␊ |
| 753 | ␉␉␉␉else if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
| 754 | ␉␉␉␉{␊ |
| 755 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
| 756 | ␉␉␉␉}␊ |
| 757 | ␉␉␉␉␊ |
| 758 | ␉␉␉␉segmentAddress += sizeof(void*);␊ |
| 759 | ␉␉␉␉break;␊ |
| 760 | ␉␉␉␉␊ |
| 761 | ␉␉␉case BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:␊ |
| 762 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB\n");␊ |
| 763 | ␉␉␉␉␊ |
| 764 | ␉␉␉␉␊ |
| 765 | ␉␉␉␉// Read in offset␊ |
| 766 | ␉␉␉␉tmp = 0;␊ |
| 767 | ␉␉␉␉bits = 0;␊ |
| 768 | ␉␉␉␉do␊ |
| 769 | ␉␉␉␉{␊ |
| 770 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
| 771 | ␉␉␉␉␉bits += 7;␊ |
| 772 | ␉␉␉␉}␊ |
| 773 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
| 774 | ␉␉␉␉␊ |
| 775 | ␉␉␉␉␊ |
| 776 | ␉␉␉␉␊ |
| 777 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
| 778 | ␉␉␉␉{␊ |
| 779 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
| 780 | ␉␉␉␉␉␊ |
| 781 | ␉␉␉␉␉((char*)address)[0] = (symbolAddr & 0x000000FF) >> 0;␊ |
| 782 | ␉␉␉␉␉((char*)address)[1] = (symbolAddr & 0x0000FF00) >> 8;␊ |
| 783 | ␉␉␉␉␉((char*)address)[2] = (symbolAddr & 0x00FF0000) >> 16;␊ |
| 784 | ␉␉␉␉␉((char*)address)[3] = (symbolAddr & 0xFF000000) >> 24;␊ |
| 785 | ␉␉␉␉}␊ |
| 786 | ␉␉␉␉else if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
| 787 | ␉␉␉␉{␊ |
| 788 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
| 789 | ␉␉␉␉}␊ |
| 790 | ␉␉␉␉segmentAddress += tmp + sizeof(void*);␊ |
| 791 | ␊ |
| 792 | ␉␉␉␉␊ |
| 793 | ␉␉␉␉break;␊ |
| 794 | ␉␉␉␉␊ |
| 795 | ␉␉␉case BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED:␊ |
| 796 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED\n");␊ |
| 797 | ␉␉␉␉␊ |
| 798 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
| 799 | ␉␉␉␉{␊ |
| 800 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
| 801 | ␉␉␉␉␉␊ |
| 802 | ␉␉␉␉␉((char*)address)[0] = (symbolAddr & 0x000000FF) >> 0;␊ |
| 803 | ␉␉␉␉␉((char*)address)[1] = (symbolAddr & 0x0000FF00) >> 8;␊ |
| 804 | ␉␉␉␉␉((char*)address)[2] = (symbolAddr & 0x00FF0000) >> 16;␊ |
| 805 | ␉␉␉␉␉((char*)address)[3] = (symbolAddr & 0xFF000000) >> 24;␊ |
| 806 | ␉␉␉␉}␊ |
| 807 | ␉␉␉␉else if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
| 808 | ␉␉␉␉{␊ |
| 809 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
| 810 | ␉␉␉␉}␊ |
| 811 | ␉␉␉␉segmentAddress += (immediate * sizeof(void*)) + sizeof(void*);␊ |
| 812 | ␊ |
| 813 | ␉␉␉␉␊ |
| 814 | ␉␉␉␉break;␊ |
| 815 | ␉␉␉␉␊ |
| 816 | ␉␉␉case BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:␊ |
| 817 | ␊ |
| 818 | ␉␉␉␉tmp = 0;␊ |
| 819 | ␉␉␉␉bits = 0;␊ |
| 820 | ␉␉␉␉do␊ |
| 821 | ␉␉␉␉{␊ |
| 822 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
| 823 | ␉␉␉␉␉bits += 7;␊ |
| 824 | ␉␉␉␉}␊ |
| 825 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
| 826 | ␊ |
| 827 | ␉␉␉␉␊ |
| 828 | ␉␉␉␉tmp2 = 0;␊ |
| 829 | ␉␉␉␉bits = 0;␊ |
| 830 | ␉␉␉␉do␊ |
| 831 | ␉␉␉␉{␊ |
| 832 | ␉␉␉␉␉tmp2 |= (bind_stream[++i] & 0x7f) << bits;␊ |
| 833 | ␉␉␉␉␉bits += 7;␊ |
| 834 | ␉␉␉␉}␊ |
| 835 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
| 836 | ␉␉␉␉␊ |
| 837 | ␉␉␉␉␊ |
| 838 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB 0x%X 0x%X\n", tmp, tmp2);␊ |
| 839 | ␊ |
| 840 | ␉␉␉␉␊ |
| 841 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
| 842 | ␉␉␉␉{␊ |
| 843 | ␉␉␉␉␉for(index = 0; index < tmp; index++)␊ |
| 844 | ␉␉␉␉␉{␊ |
| 845 | ␉␉␉␉␉␉␊ |
| 846 | ␉␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
| 847 | ␉␉␉␉␉␉␊ |
| 848 | ␉␉␉␉␉␉((char*)address)[0] = (symbolAddr & 0x000000FF) >> 0;␊ |
| 849 | ␉␉␉␉␉␉((char*)address)[1] = (symbolAddr & 0x0000FF00) >> 8;␊ |
| 850 | ␉␉␉␉␉␉((char*)address)[2] = (symbolAddr & 0x00FF0000) >> 16;␊ |
| 851 | ␉␉␉␉␉␉((char*)address)[3] = (symbolAddr & 0xFF000000) >> 24;␊ |
| 852 | ␉␉␉␉␉␉␊ |
| 853 | ␉␉␉␉␉␉segmentAddress += tmp2 + sizeof(void*);␊ |
| 854 | ␉␉␉␉␉}␊ |
| 855 | ␉␉␉␉}␊ |
| 856 | ␉␉␉␉else if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
| 857 | ␉␉␉␉{␊ |
| 858 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
| 859 | ␉␉␉␉}␊ |
| 860 | ␉␉␉␉␊ |
| 861 | ␉␉␉␉␊ |
| 862 | ␉␉␉␉break;␊ |
| 863 | ␉␉␉␉␊ |
| 864 | ␉␉}␊ |
| 865 | ␉␉i++;␊ |
| 866 | ␉}␊ |
| 867 | }␊ |
| 868 | ␊ |
| 869 | inline void rebase_location(UInt32* location, char* base)␊ |
| 870 | {␊ |
| 871 | ␉*location += (UInt32)base;␊ |
| 872 | }␊ |
| 873 | ␊ |
| 874 | /*␊ |
| 875 | * add_symbol␊ |
| 876 | * This function adds a symbol from a module to the list of known symbols ␊ |
| 877 | * possibly change to a pointer and add this to the Symbol module so that it can␊ |
| 878 | * adjust it's internal symbol list (sort) to optimize locating new symbols␊ |
| 879 | * NOTE: returns the address if the symbol is "start", else returns 0xFFFFFFFF␊ |
| 880 | */␊ |
| 881 | void* add_symbol(char* symbol, void* addr)␊ |
| 882 | {␊ |
| 883 | ␉symbolList_t* entry;␊ |
| 884 | ␉//DBG("Adding symbol %s at 0x%X\n", symbol, addr);␊ |
| 885 | ␉␊ |
| 886 | ␉if(!moduleSymbols)␊ |
| 887 | ␉{␊ |
| 888 | ␉␉moduleSymbols = entry = malloc(sizeof(symbolList_t));␊ |
| 889 | ␊ |
| 890 | ␉}␊ |
| 891 | ␉else␊ |
| 892 | ␉{␊ |
| 893 | ␉␉entry = moduleSymbols;␊ |
| 894 | ␉␉while(entry->next)␊ |
| 895 | ␉␉{␊ |
| 896 | ␉␉␉entry = entry->next;␊ |
| 897 | ␉␉}␊ |
| 898 | ␉␉␊ |
| 899 | ␉␉entry->next = malloc(sizeof(symbolList_t));␊ |
| 900 | ␉␉entry = entry->next;␊ |
| 901 | ␉}␊ |
| 902 | ␊ |
| 903 | ␉entry->next = NULL;␊ |
| 904 | ␉entry->addr = (unsigned int)addr;␊ |
| 905 | ␉entry->symbol = symbol;␊ |
| 906 | ␉␊ |
| 907 | ␉if(strcmp(symbol, "start") == 0)␊ |
| 908 | ␉{␊ |
| 909 | ␉␉return addr;␊ |
| 910 | ␉}␊ |
| 911 | ␉else␊ |
| 912 | ␉{␊ |
| 913 | ␉␉return (void*)0xFFFFFFFF;␊ |
| 914 | ␉}␊ |
| 915 | }␊ |
| 916 | ␊ |
| 917 | ␊ |
| 918 | /*␊ |
| 919 | * print out the information about the loaded module␊ |
| 920 | ␊ |
| 921 | */␊ |
| 922 | void module_loaded(char* name, UInt32 version, UInt32 compat)␊ |
| 923 | {␊ |
| 924 | ␉moduleList_t* entry;␊ |
| 925 | ␉/*␊ |
| 926 | ␉DBG("\%s.dylib Version %d.%d.%d loaded\n"␊ |
| 927 | ␉␉ "\tCompatibility Version: %d.%d.%d\n",␊ |
| 928 | ␉␉ name,␊ |
| 929 | ␉␉ (version >> 16) & 0xFFFF,␊ |
| 930 | ␉␉ (version >> 8) & 0x00FF,␊ |
| 931 | ␉␉ (version >> 0) & 0x00FF,␊ |
| 932 | ␉␉ (compat >> 16) & 0xFFFF,␊ |
| 933 | ␉␉ (compat >> 8) & 0x00FF,␊ |
| 934 | ␉␉ (compat >> 0) & 0x00FF);␉␊ |
| 935 | ␉*/␊ |
| 936 | ␉if(loadedModules == NULL)␊ |
| 937 | ␉{␊ |
| 938 | ␉␉loadedModules = entry = malloc(sizeof(moduleList_t));␊ |
| 939 | ␉}␊ |
| 940 | ␉else␊ |
| 941 | ␉{␊ |
| 942 | ␉␉entry = loadedModules;␊ |
| 943 | ␉␉while(entry->next)␊ |
| 944 | ␉␉{␊ |
| 945 | ␉␉␉entry = entry->next;␊ |
| 946 | ␉␉}␊ |
| 947 | ␉␉entry->next = malloc(sizeof(moduleList_t));␊ |
| 948 | ␉␉entry = entry->next;␊ |
| 949 | ␉}␊ |
| 950 | ␉␊ |
| 951 | ␉entry->next = NULL;␊ |
| 952 | ␉entry->module = name;␊ |
| 953 | ␉entry->version = version;␊ |
| 954 | ␉entry->compat = compat;␊ |
| 955 | ␉␊ |
| 956 | ␉␊ |
| 957 | }␊ |
| 958 | ␊ |
| 959 | int is_module_laoded(const char* name)␊ |
| 960 | {␊ |
| 961 | ␉moduleList_t* entry = loadedModules;␊ |
| 962 | ␉while(entry)␊ |
| 963 | ␉{␊ |
| 964 | ␉␉if(strcmp(entry->module, name) == 0)␊ |
| 965 | ␉␉{␊ |
| 966 | ␉␉␉return 1;␊ |
| 967 | ␉␉}␊ |
| 968 | ␉␉else␊ |
| 969 | ␉␉{␊ |
| 970 | ␉␉␉entry = entry->next;␊ |
| 971 | ␉␉}␊ |
| 972 | ␊ |
| 973 | ␉}␊ |
| 974 | ␉return 0;␊ |
| 975 | }␊ |
| 976 | ␊ |
| 977 | // Look for symbols using the Smbols moduel function.␊ |
| 978 | // If non are found, look through the list of module symbols␊ |
| 979 | unsigned int lookup_all_symbols(const char* name)␊ |
| 980 | {␊ |
| 981 | ␉unsigned int addr = 0xFFFFFFFF;␊ |
| 982 | ␉if(lookup_symbol && (UInt32)lookup_symbol != 0xFFFFFFFF)␊ |
| 983 | ␉{␊ |
| 984 | ␉␉addr = lookup_symbol(name);␊ |
| 985 | ␉␉if(addr != 0xFFFFFFFF)␊ |
| 986 | ␉␉{␊ |
| 987 | ␉␉␉//DBG("Internal symbol %s located at 0x%X\n", name, addr);␊ |
| 988 | ␉␉␉return addr;␊ |
| 989 | ␉␉}␊ |
| 990 | ␉}␊ |
| 991 | ␊ |
| 992 | ␉␊ |
| 993 | ␉symbolList_t* entry = moduleSymbols;␊ |
| 994 | ␉while(entry)␊ |
| 995 | ␉{␊ |
| 996 | ␉␉if(strcmp(entry->symbol, name) == 0)␊ |
| 997 | ␉␉{␊ |
| 998 | ␉␉␉//DBG("External symbol %s located at 0x%X\n", name, entry->addr);␊ |
| 999 | ␉␉␉return entry->addr;␊ |
| 1000 | ␉␉}␊ |
| 1001 | ␉␉else␊ |
| 1002 | ␉␉{␊ |
| 1003 | ␉␉␉entry = entry->next;␊ |
| 1004 | ␉␉}␊ |
| 1005 | ␊ |
| 1006 | ␉}␊ |
| 1007 | ␉if(strcmp(name, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
| 1008 | ␉{␊ |
| 1009 | ␉␉printf("Unable to locate symbol %s\n", name);␊ |
| 1010 | ␉}␊ |
| 1011 | ␉return 0xFFFFFFFF;␊ |
| 1012 | }␊ |
| 1013 | ␊ |
| 1014 | ␊ |
| 1015 | /*␊ |
| 1016 | * parse the symbol table␊ |
| 1017 | * Lookup any undefined symbols␊ |
| 1018 | */␊ |
| 1019 | ␊ |
| 1020 | unsigned int handle_symtable(UInt32 base, struct symtab_command* symtabCommand, void*(*symbol_handler)(char*, void*))␊ |
| 1021 | {␊ |
| 1022 | ␉unsigned int module_start = 0xFFFFFFFF;␊ |
| 1023 | ␉␊ |
| 1024 | ␉UInt32 symbolIndex = 0;␊ |
| 1025 | ␉char* symbolString = base + (char*)symtabCommand->stroff;␊ |
| 1026 | ␉//char* symbolTable = base + symtabCommand->symoff;␊ |
| 1027 | ␉␊ |
| 1028 | ␉while(symbolIndex < symtabCommand->nsyms)␊ |
| 1029 | ␉{␊ |
| 1030 | ␉␉␊ |
| 1031 | ␉␉struct nlist* symbolEntry = (void*)base + symtabCommand->symoff + (symbolIndex * sizeof(struct nlist));␊ |
| 1032 | ␉␉␊ |
| 1033 | ␉␉// If the symbol is exported by this module␊ |
| 1034 | ␉␉if(symbolEntry->n_value &&␊ |
| 1035 | ␉␉ symbol_handler(symbolString + symbolEntry->n_un.n_strx, (void*)base + symbolEntry->n_value) != (void*)0xFFFFFFFF)␊ |
| 1036 | ␉␉{␊ |
| 1037 | ␉␉ ␊ |
| 1038 | ␉␉␉// Module start located. Start is an alias so don't register it␊ |
| 1039 | ␉␉␉module_start = base + symbolEntry->n_value;␊ |
| 1040 | ␉␉}␊ |
| 1041 | ␉␉␊ |
| 1042 | ␉␉symbolEntry+= sizeof(struct nlist);␊ |
| 1043 | ␉␉symbolIndex++;␉// TODO remove␊ |
| 1044 | ␉}␊ |
| 1045 | ␉␊ |
| 1046 | ␉return module_start;␊ |
| 1047 | ␉␊ |
| 1048 | }␊ |
| 1049 | ␊ |
| 1050 | ␊ |
| 1051 | /*␊ |
| 1052 | * Locate the symbol for an already loaded function and modify the beginning of␊ |
| 1053 | * the function to jump directly to the new one␊ |
| 1054 | * example: replace_function("_HelloWorld_start", &replacement_start);␊ |
| 1055 | */␊ |
| 1056 | int replace_function(const char* symbol, void* newAddress)␊ |
| 1057 | {␊ |
| 1058 | ␉UInt32* jumpPointer = malloc(sizeof(UInt32*));␉ ␊ |
| 1059 | ␉// TODO: look into using the next four bytes of the function instead␊ |
| 1060 | ␉// Most functions should support this, as they probably will be at ␊ |
| 1061 | ␉// least 10 bytes long, but you never know, this is sligtly safer as␊ |
| 1062 | ␉// function can be as small as 6 bytes.␊ |
| 1063 | ␉UInt32 addr = lookup_all_symbols(symbol);␊ |
| 1064 | ␉␊ |
| 1065 | ␉char* binary = (char*)addr;␊ |
| 1066 | ␉if(addr != 0xFFFFFFFF)␊ |
| 1067 | ␉{␊ |
| 1068 | ␉␉*binary++ = 0xFF;␉// Jump␊ |
| 1069 | ␉␉*binary++ = 0x25;␉// Long Jump␊ |
| 1070 | ␉␉*((UInt32*)binary) = (UInt32)jumpPointer;␊ |
| 1071 | ␉␉␊ |
| 1072 | ␉␉*jumpPointer = (UInt32)newAddress;␊ |
| 1073 | ␉␉␊ |
| 1074 | ␉␉return 1;␊ |
| 1075 | ␉}␊ |
| 1076 | ␉else ␊ |
| 1077 | ␉{␊ |
| 1078 | ␉␉return 0;␊ |
| 1079 | ␉}␊ |
| 1080 | ␊ |
| 1081 | } |
