Root/
Source at commit 430 created 13 years 8 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 | } |