1 | /*␊ |
2 | * Copyright 2010 Evan Lojewski. All rights reserved.␊ |
3 | *␊ |
4 | * TODO: Zero out bss if needed␊ |
5 | */␊ |
6 | ␊ |
7 | #include "boot.h"␊ |
8 | #include "bootstruct.h"␊ |
9 | #include "multiboot.h"␊ |
10 | #include "modules.h"␊ |
11 | ␊ |
12 | #ifndef DEBUG_MODULES␊ |
13 | #define DEBUG_MODULES 0␊ |
14 | #endif␊ |
15 | ␊ |
16 | #if DEBUG_MODULES␊ |
17 | #define DBG(x...)␉verbose(x) //;getc()␊ |
18 | #else␊ |
19 | #define DBG(x...)␉//msglog(x)␊ |
20 | #endif␊ |
21 | ␊ |
22 | // NOTE: Global so that modules can link with this␊ |
23 | unsigned long long textAddress = 0;␊ |
24 | unsigned long long textSection = 0;␊ |
25 | ␊ |
26 | void* symbols_module_start = (void*)0xFFFFFFFF;␉// This will be modified post compile␊ |
27 | ␊ |
28 | /** Internal symbols, however there are accessor methods **/␊ |
29 | moduleHook_t* moduleCallbacks = NULL;␊ |
30 | moduleList_t* loadedModules = NULL;␊ |
31 | symbolList_t* moduleSymbols = NULL;␊ |
32 | unsigned int (*lookup_symbol)(const char*) = NULL;␊ |
33 | ␊ |
34 | ␊ |
35 | ␊ |
36 | ␊ |
37 | ␊ |
38 | #if DEBUG_MODULES␊ |
39 | void print_hook_list()␊ |
40 | {␊ |
41 | ␉DBG("---Hook Table---\n");␊ |
42 | ␊ |
43 | ␉moduleHook_t* hooks = moduleCallbacks;␊ |
44 | ␉while(hooks)␊ |
45 | ␉{␊ |
46 | ␉␉DBG("Hook: %s\n", hooks->name);␊ |
47 | ␉␉hooks = hooks->next;␊ |
48 | ␉}␊ |
49 | }␊ |
50 | #endif␊ |
51 | ␊ |
52 | /*␊ |
53 | * Initialize the module system by loading the Symbols.dylib module.␊ |
54 | * Once loaded, locate the _lookup_symbol function so that internal␊ |
55 | * symbols can be resolved.␊ |
56 | */␊ |
57 | int init_module_system()␊ |
58 | {␊ |
59 | ␉void (*module_start)(void) = NULL;␊ |
60 | ␉char* module_data = symbols_module_start + BOOT2_ADDR;␊ |
61 | ␉// Intialize module system␊ |
62 | ␉if(symbols_module_start == (void*)0xFFFFFFFF)␊ |
63 | ␉{␊ |
64 | ␉␉DBG("Module system not compiled in\n");␊ |
65 | ␉␉load_module(SYMBOLS_MODULE);␊ |
66 | ␉␉␊ |
67 | ␉␉lookup_symbol = (void*)lookup_all_symbols(SYMBOL_LOOKUP_SYMBOL);␊ |
68 | ␉␉␊ |
69 | ␉␉if((UInt32)lookup_symbol != 0xFFFFFFFF)␊ |
70 | ␉␉{␊ |
71 | ␉␉␉return 1;␊ |
72 | ␉␉}␊ |
73 | ␉␉␊ |
74 | ␉␉return 0;␊ |
75 | ␉}␊ |
76 | ␊ |
77 | ␉module_start = parse_mach(module_data, &load_module, &add_symbol);␊ |
78 | ␉␊ |
79 | ␉if(module_start && module_start != (void*)0xFFFFFFFF)␊ |
80 | ␉{␊ |
81 | ␉␉// Notify the system that it was laoded␊ |
82 | ␉␉module_loaded(SYMBOLS_MODULE /*moduleName, moduleVersion, moduleCompat*/);␊ |
83 | ␉␉(*module_start)();␉// Start the module␊ |
84 | ␉␉DBG("Module %s Loaded.\n", SYMBOLS_MODULE);␊ |
85 | ␊ |
86 | ␉␉lookup_symbol = (void*)lookup_all_symbols(SYMBOL_LOOKUP_SYMBOL);␊ |
87 | ␉␉␊ |
88 | ␉␉if((UInt32)lookup_symbol != 0xFFFFFFFF)␊ |
89 | ␉␉{␊ |
90 | ␉␉␉return 1;␊ |
91 | ␉␉}␊ |
92 | ␉}␊ |
93 | ␉else {␊ |
94 | ␉␉// The module does not have a valid start function␊ |
95 | ␉␉verbose("Unable to start %s\n", SYMBOLS_MODULE);␊ |
96 | ␉␉//getc();␊ |
97 | ␉}␉␉␊ |
98 | ␉return 0;␊ |
99 | }␊ |
100 | ␊ |
101 | ␊ |
102 | /*␊ |
103 | * Load all modules in the /Extra/modules/ directory␊ |
104 | * Module depencdies will be loaded first␊ |
105 | * Modules will only be loaded once. When loaded a module must␊ |
106 | * setup apropriete function calls and hooks as required.␊ |
107 | * NOTE: To ensure a module loads after another you may ␊ |
108 | * link one module with the other. For dyld to allow this, you must␊ |
109 | * reference at least one symbol within the module.␊ |
110 | */␊ |
111 | void load_all_modules()␊ |
112 | {␊ |
113 | ␉char* name;␊ |
114 | ␉long flags;␊ |
115 | ␉long time;␊ |
116 | ␉struct dirstuff* moduleDir = opendir("/Extra/modules/");␊ |
117 | ␉while(readdir(moduleDir, (const char**)&name, &flags, &time) >= 0)␊ |
118 | ␉{␊ |
119 | ␉␉if(strcmp(&name[strlen(name) - sizeof("dylib")], ".dylib") == 0)␊ |
120 | ␉␉{␊ |
121 | ␉␉␉char* tmp = malloc(strlen(name) + 1);␊ |
122 | ␉␉␉if (name[0] == '.') {␊ |
123 | ␉␉␉␉continue;␊ |
124 | ␉␉␉}␊ |
125 | ␉␉␉strcpy(tmp, name);␊ |
126 | ␉␉␉␊ |
127 | ␉␉␉DBG("Attempting to load %s\n", tmp);␉␉␉␊ |
128 | ␉␉␉if(!load_module(tmp))␊ |
129 | ␉␉␉{␊ |
130 | ␉␉␉␉// failed to load␊ |
131 | ␉␉␉␉// free(tmp);␊ |
132 | ␉␉␉␉DBG("...failed to load\n");␊ |
133 | ␉␉␉}␊ |
134 | ␉␉}␊ |
135 | ␉␉else ␊ |
136 | ␉␉{␊ |
137 | ␉␉␉DBG("Ignoring %s\n", name);␊ |
138 | ␉␉}␊ |
139 | ␊ |
140 | ␉}␊ |
141 | }␊ |
142 | ␊ |
143 | ␊ |
144 | /*␊ |
145 | * Load a module file in /Extra/modules␊ |
146 | * TODO: verify version number of module␊ |
147 | */␊ |
148 | int load_module(char* module)␊ |
149 | {␊ |
150 | ␉void (*module_start)(void) = NULL;␊ |
151 | ␊ |
152 | ␉␊ |
153 | ␉// Check to see if the module has already been loaded␊ |
154 | ␉if(is_module_loaded(module))␊ |
155 | ␉{␊ |
156 | ␉␉// NOTE: Symbols.dylib tries to load twice, this catches it as well␊ |
157 | ␉␉// as when a module links with an already loaded module␊ |
158 | ␉␉DBG("Module %s already loaded\n", module);␊ |
159 | ␉␉return 1;␊ |
160 | ␉}␊ |
161 | ␉␊ |
162 | ␉char modString[128];␊ |
163 | ␉int fh = -1;␊ |
164 | ␉sprintf(modString, "/Extra/modules/%s", module);␊ |
165 | ␉fh = open(modString, 0);␊ |
166 | ␉if(fh < 0)␊ |
167 | ␉{␊ |
168 | ␉␉DBG("Unable to locate module %s\n", modString);␊ |
169 | ␉␉//getc();␊ |
170 | ␉␉return 0;␊ |
171 | ␉}␊ |
172 | ␉␊ |
173 | ␉unsigned int moduleSize = file_size(fh);␊ |
174 | ␉char* module_base = (char*) malloc(moduleSize);␊ |
175 | ␉if (moduleSize && read(fh, module_base, moduleSize) == moduleSize)␊ |
176 | ␉{␊ |
177 | ␊ |
178 | ␉␉DBG("Module %s read in.\n", modString);␊ |
179 | ␊ |
180 | ␉␉// Module loaded into memory, parse it␊ |
181 | ␉␉module_start = parse_mach(module_base, &load_module, &add_symbol);␊ |
182 | ␊ |
183 | ␉␉if(module_start && module_start != (void*)0xFFFFFFFF)␊ |
184 | ␉␉{␊ |
185 | ␉␉␉// Notify the system that it was laoded␊ |
186 | ␉␉␉module_loaded(module/*moduleName, moduleVersion, moduleCompat*/);␊ |
187 | ␉␉␉(*module_start)();␉// Start the module␊ |
188 | ␉␉␉DBG("Module %s Loaded.\n", module);␊ |
189 | ␉␉}␊ |
190 | ␉␉else {␊ |
191 | ␉␉␉// The module does not have a valid start function␊ |
192 | ␉␉␉verbose("Unable to start %s\n", module);␊ |
193 | ␉␉␉getc();␊ |
194 | ␉␉}␉␉␊ |
195 | ␉}␊ |
196 | ␉else␊ |
197 | ␉{␊ |
198 | ␉␉DBG("Unable to read in module %s\n.", module);␊ |
199 | ␉␉//getc();␊ |
200 | ␉}␊ |
201 | ␉close(fh);␊ |
202 | ␉return 1;␊ |
203 | }␊ |
204 | ␊ |
205 | /*␊ |
206 | *␉execute_hook( const char* name )␊ |
207 | *␉␉name - Name of the module hook␊ |
208 | *␉␉␉If any callbacks have been registered for this hook␊ |
209 | *␉␉␉they will be executed now in the same order that the␊ |
210 | *␉␉␉hooks were added.␊ |
211 | */␊ |
212 | int execute_hook(const char* name, void* arg1, void* arg2, void* arg3, void* arg4)␊ |
213 | {␊ |
214 | ␉DBG("Attempting to execute hook '%s'\n", name);␊ |
215 | ␉moduleHook_t* hooks = moduleCallbacks;␊ |
216 | ␊ |
217 | ␉while(hooks && strcmp(name, hooks->name) < 0)␊ |
218 | ␉{␊ |
219 | ␉␉//DBG("%s cmp %s = %d\n", name, hooks->name, strcmp(name, hooks->name));␊ |
220 | ␉␉hooks = hooks->next;␊ |
221 | ␉}␊ |
222 | ␊ |
223 | ␉if(hooks && strcmp(name, hooks->name) == 0)␊ |
224 | ␉{␊ |
225 | ␉␉// Loop through all callbacks for this module␊ |
226 | ␉␉callbackList_t* callbacks = hooks->callbacks;␊ |
227 | ␉␉␊ |
228 | ␉␉while(callbacks)␊ |
229 | ␉␉{␊ |
230 | ␉␉␉DBG("Executing '%s' with callback 0x%X.\n", name, callbacks->callback);␊ |
231 | ␉␉␉// Execute callback␊ |
232 | ␉␉␉callbacks->callback(arg1, arg2, arg3, arg4);␊ |
233 | ␉␉␉callbacks = callbacks->next;␊ |
234 | ␉␉␉DBG("Hook '%s' callback executed, next is 0x%X.\n", name, callbacks);␊ |
235 | ␉␉␉␊ |
236 | ␉␉}␊ |
237 | ␉␉DBG("Hook '%s' executed.\n", name);␊ |
238 | ␉␉␊ |
239 | ␉␉return 1;␊ |
240 | ␉}␊ |
241 | ␉else␊ |
242 | ␉{␊ |
243 | ␉␉DBG("No callbacks for '%s' hook.\n", name);␊ |
244 | ␉␉␊ |
245 | ␉␉// Callbaack for this module doesn't exist;␊ |
246 | ␉␉//verbose("Unable execute hook '%s', no callbacks registered.\n", name);␊ |
247 | ␉␉//pause();␊ |
248 | ␉␉return 0;␊ |
249 | ␉}␊ |
250 | }␊ |
251 | ␊ |
252 | ␊ |
253 | ␊ |
254 | /*␊ |
255 | *␉register_hook_callback( const char* name, void(*callback)())␊ |
256 | *␉␉name - Name of the module hook to attach to.␊ |
257 | *␉␉callbacks - The funciton pointer that will be called when the␊ |
258 | *␉␉␉hook is executed. When registering a new callback name, the callback is added sorted.␊ |
259 | *␉␉␉NOTE: the hooks take four void* arguments.␊ |
260 | *␉␉␉TODO: refactor␊ |
261 | */␊ |
262 | void register_hook_callback(const char* name, void(*callback)(void*, void*, void*, void*))␊ |
263 | {␉␊ |
264 | ␉DBG("Adding callback for '%s' hook.\n", name);␊ |
265 | ␊ |
266 | ␉moduleHook_t* newHook = malloc(sizeof(moduleHook_t));␊ |
267 | ␉if(!moduleCallbacks)␊ |
268 | ␉{␊ |
269 | ␉␉newHook->next = moduleCallbacks;␊ |
270 | ␉␉moduleCallbacks = newHook;␊ |
271 | ␉␉␊ |
272 | ␉␉newHook->name = name;␊ |
273 | ␉␉newHook->callbacks = (callbackList_t*)malloc(sizeof(callbackList_t));␊ |
274 | ␉␉newHook->callbacks->callback = callback;␊ |
275 | ␉␉newHook->callbacks->next = NULL;␊ |
276 | ␉}␊ |
277 | ␉else␊ |
278 | ␉{␊ |
279 | ␉␉moduleHook_t* hooks = moduleCallbacks;␊ |
280 | ␉␉␊ |
281 | ␉␉while(hooks->next && strcmp(name, hooks->next->name) < 0)␊ |
282 | ␉␉{␊ |
283 | ␉␉␉hooks = hooks->next;␊ |
284 | ␉␉}␊ |
285 | ␉␉␊ |
286 | ␉␉if(!hooks->next)␊ |
287 | ␉␉{␊ |
288 | ␉␉␉// Appent to the end␊ |
289 | ␉␉␉newHook->next = NULL;␊ |
290 | ␉␉␉hooks->next = newHook;␊ |
291 | ␉␉␉newHook->name = name;␊ |
292 | ␉␉␉newHook->callbacks = (callbackList_t*)malloc(sizeof(callbackList_t));␊ |
293 | ␉␉␉newHook->callbacks->callback = callback;␊ |
294 | ␉␉␉newHook->callbacks->next = NULL;␊ |
295 | ␉␉␉␊ |
296 | ␉␉␉␊ |
297 | ␉␉}␊ |
298 | ␉␉else if(strcmp(name, hooks->next->name) == 0)␊ |
299 | ␉␉{␊ |
300 | ␉␉␉// We found the hook␊ |
301 | ␉␉␉// Hook alreday exists, add a callback to this hook␊ |
302 | ␉␉␉callbackList_t* callbacks = hooks->next->callbacks;␊ |
303 | ␉␉␉while(callbacks->next != NULL)␊ |
304 | ␉␉␉{␊ |
305 | ␉␉␉␉callbacks = callbacks->next;␊ |
306 | ␉␉␉}␊ |
307 | ␉␉␉// Add new entry to end of hook list.␊ |
308 | ␉␉␉callbacks->next = (callbackList_t*)malloc(sizeof(callbackList_t));␊ |
309 | ␉␉␉callbacks = callbacks->next;␊ |
310 | ␉␉␉callbacks->next = NULL;␊ |
311 | ␉␉␉callbacks->callback = callback;␊ |
312 | ␉␉}␊ |
313 | ␉␉else␊ |
314 | ␉␉{␊ |
315 | ␉␉␉// We are too far beyond the hook␊ |
316 | ␉␉␉newHook->next = hooks->next;␊ |
317 | ␉␉␉hooks->next = newHook;␊ |
318 | ␉␉␉newHook->name = name;␊ |
319 | ␉␉␉newHook->callbacks = (callbackList_t*)malloc(sizeof(callbackList_t));␊ |
320 | ␉␉␉newHook->callbacks->callback = callback;␊ |
321 | ␉␉␉newHook->callbacks->next = NULL;␊ |
322 | ␉␉␉␊ |
323 | ␉␉}␊ |
324 | ␉}␊ |
325 | #if DEBUG_MODULES␊ |
326 | ␉print_hook_list();␊ |
327 | ␉//getc();␊ |
328 | #endif␊ |
329 | ␉␊ |
330 | }␊ |
331 | ␊ |
332 | ␊ |
333 | /*␊ |
334 | * Parse through a macho module. The module will be rebased and binded␊ |
335 | * as specified in the macho header. If the module is sucessfuly laoded␊ |
336 | * the module iinit address will be returned.␊ |
337 | * NOTE; all dependecies will be loaded before this module is started␊ |
338 | * NOTE: If the module is unable to load ot completeion, the modules␊ |
339 | * symbols will still be available (TODO: fix this). This should not␊ |
340 | * happen as all dependencies are verified before the sybols are read in.␊ |
341 | */␊ |
342 | void* parse_mach(void* binary, int(*dylib_loader)(char*), long long(*symbol_handler)(char*, long long, char))␉// TODO: add param to specify valid archs␊ |
343 | {␉␊ |
344 | ␉char is64 = false;␊ |
345 | ␉void (*module_start)(void) = NULL;␊ |
346 | ␉␊ |
347 | ␉// Module info␊ |
348 | ␉/*char* moduleName = NULL;␊ |
349 | ␉UInt32 moduleVersion = 0;␊ |
350 | ␉UInt32 moduleCompat = 0;␊ |
351 | ␉*/␊ |
352 | ␉// TODO convert all of the structs to a union␊ |
353 | ␉struct load_command *loadCommand = NULL;␊ |
354 | ␉struct dylib_command* dylibCommand = NULL;␊ |
355 | ␉struct dyld_info_command* dyldInfoCommand = NULL;␊ |
356 | ␉␊ |
357 | ␉struct symtab_command* symtabCommand = NULL;␊ |
358 | ␉struct segment_command *segCommand = NULL;␊ |
359 | ␉struct segment_command_64 *segCommand64 = NULL;␊ |
360 | ␊ |
361 | ␉//struct dysymtab_command* dysymtabCommand = NULL;␊ |
362 | ␉UInt32 binaryIndex = 0;␊ |
363 | ␉UInt16 cmd = 0;␊ |
364 | ␊ |
365 | ␉// Parse through the load commands␊ |
366 | ␉if(((struct mach_header*)binary)->magic == MH_MAGIC)␊ |
367 | ␉{␊ |
368 | ␉␉is64 = false;␊ |
369 | ␉␉binaryIndex += sizeof(struct mach_header);␊ |
370 | ␉}␊ |
371 | ␉else if(((struct mach_header_64*)binary)->magic == MH_MAGIC_64)␊ |
372 | ␉{␊ |
373 | ␉␉// NOTE: modules cannot be 64bit...␊ |
374 | ␉␉is64 = true;␊ |
375 | ␉␉binaryIndex += sizeof(struct mach_header_64);␊ |
376 | ␉}␊ |
377 | ␉else␊ |
378 | ␉{␊ |
379 | ␉␉verbose("Invalid mach magic 0x%X\n", ((struct mach_header*)binary)->magic);␊ |
380 | ␉␉getc();␊ |
381 | ␉␉return NULL;␊ |
382 | ␉}␊ |
383 | ␊ |
384 | ␊ |
385 | ␉␊ |
386 | ␉/*if(((struct mach_header*)binary)->filetype != MH_DYLIB)␊ |
387 | ␉{␊ |
388 | ␉␉verbose("Module is not a dylib. Unable to load.\n");␊ |
389 | ␉␉getc();␊ |
390 | ␉␉return NULL; // Module is in the incorrect format␊ |
391 | ␉}*/␊ |
392 | ␉␊ |
393 | ␉while(cmd < ((struct mach_header*)binary)->ncmds)␊ |
394 | ␉{␊ |
395 | ␉␉cmd++;␊ |
396 | ␉␉␊ |
397 | ␉␉loadCommand = binary + binaryIndex;␊ |
398 | ␉␉UInt32 cmdSize = loadCommand->cmdsize;␊ |
399 | ␊ |
400 | ␉␉␊ |
401 | ␉␉switch ((loadCommand->cmd & 0x7FFFFFFF))␊ |
402 | ␉␉{␊ |
403 | ␉␉␉␉// TODO: sepeare function to handel appropriate sections␊ |
404 | ␉␉␉case LC_SYMTAB:␊ |
405 | ␉␉␉␉symtabCommand = binary + binaryIndex;␊ |
406 | ␉␉␉␉break;␊ |
407 | ␉␉␉␉␊ |
408 | ␉␉␉case LC_SEGMENT: // 32bit macho␊ |
409 | ␉␉␉␉segCommand = binary + binaryIndex;␊ |
410 | ␉␉␉␉␊ |
411 | ␉␉␉␉//printf("Segment name is %s\n", segCommand->segname);␊ |
412 | ␉␉␉␉␊ |
413 | ␉␉␉␉if(strcmp("__TEXT", segCommand->segname) == 0)␊ |
414 | ␉␉␉␉{␊ |
415 | ␉␉␉␉␉UInt32 sectionIndex;␊ |
416 | ␉␉␉␉␉␊ |
417 | ␉␉␉␉␉sectionIndex = sizeof(struct segment_command);␊ |
418 | ␉␉␉␉␉␊ |
419 | ␉␉␉␉␉struct section *sect;␊ |
420 | ␉␉␉␉␉␊ |
421 | ␉␉␉␉␉while(sectionIndex < segCommand->cmdsize)␊ |
422 | ␉␉␉␉␉{␊ |
423 | ␉␉␉␉␉␉sect = binary + binaryIndex + sectionIndex;␊ |
424 | ␉␉␉␉␉␉␊ |
425 | ␉␉␉␉␉␉sectionIndex += sizeof(struct section);␊ |
426 | ␉␉␉␉␉␉␊ |
427 | ␉␉␉␉␉␉␊ |
428 | ␉␉␉␉␉␉if(strcmp("__text", sect->sectname) == 0)␊ |
429 | ␉␉␉␉␉␉{␊ |
430 | ␉␉␉␉␉␉␉// __TEXT,__text found, save the offset and address for when looking for the calls.␊ |
431 | ␉␉␉␉␉␉␉textSection = sect->offset;␊ |
432 | ␉␉␉␉␉␉␉textAddress = sect->addr;␊ |
433 | ␉␉␉␉␉␉␉break;␊ |
434 | ␉␉␉␉␉␉}␉␉␉␉␉␊ |
435 | ␉␉␉␉␉}␊ |
436 | ␉␉␉␉}␊ |
437 | ␉␉␉␉else if(strcmp("__DATA", segCommand->segname) == 0)␊ |
438 | ␉␉␉␉{␊ |
439 | ␉␉␉␉␉UInt32 sectionIndex;␊ |
440 | ␉␉␉␉␉␊ |
441 | ␉␉␉␉␉sectionIndex = sizeof(struct segment_command);␊ |
442 | ␉␉␉␉␉␊ |
443 | ␉␉␉␉␉struct section *sect;␊ |
444 | ␉␉␉␉␉␊ |
445 | ␉␉␉␉␉while(sectionIndex < segCommand->cmdsize)␊ |
446 | ␉␉␉␉␉{␊ |
447 | ␉␉␉␉␉␉sect = binary + binaryIndex + sectionIndex;␊ |
448 | ␉␉␉␉␉␉␊ |
449 | ␉␉␉␉␉␉sectionIndex += sizeof(struct section);␊ |
450 | ␉␉␉␉␉␉␊ |
451 | ␉␉␉␉␉␉␊ |
452 | ␉␉␉␉␉␉if(strcmp("__bss", sect->sectname) == 0)␊ |
453 | ␉␉␉␉␉␉{␊ |
454 | ␉␉␉␉␉␉␉// __TEXT,__text found, save the offset and address for when looking for the calls.␊ |
455 | ␉␉␉␉␉␉␉//printf("__DATA,__bss found.\n"); getc();␊ |
456 | ␉␉␉␉␉␉␉break;␊ |
457 | ␉␉␉␉␉␉}␉␉␉␉␉␊ |
458 | ␉␉␉␉␉}␊ |
459 | ␉␉␉␉␉␊ |
460 | ␉␉␉␉}␊ |
461 | ␊ |
462 | ␉␉␉␉break;␊ |
463 | ␉␉␉case LC_SEGMENT_64:␉// 64bit macho's␊ |
464 | ␉␉␉␉segCommand64 = binary + binaryIndex;␊ |
465 | ␉␉␉␉␊ |
466 | ␉␉␉␉//printf("Segment name is %s\n", segCommand->segname);␊ |
467 | ␉␉␉␉␊ |
468 | ␉␉␉␉if(strcmp("__TEXT", segCommand64->segname) == 0)␊ |
469 | ␉␉␉␉{␊ |
470 | ␉␉␉␉␉UInt32 sectionIndex;␊ |
471 | ␉␉␉␉␉␊ |
472 | ␉␉␉␉␉sectionIndex = sizeof(struct segment_command_64);␊ |
473 | ␉␉␉␉␉␊ |
474 | ␉␉␉␉␉struct section_64 *sect;␊ |
475 | ␉␉␉␉␉␊ |
476 | ␉␉␉␉␉while(sectionIndex < segCommand64->cmdsize)␊ |
477 | ␉␉␉␉␉{␊ |
478 | ␉␉␉␉␉␉sect = binary + binaryIndex + sectionIndex;␊ |
479 | ␉␉␉␉␉␉␊ |
480 | ␉␉␉␉␉␉sectionIndex += sizeof(struct section_64);␊ |
481 | ␉␉␉␉␉␉␊ |
482 | ␉␉␉␉␉␉␊ |
483 | ␉␉␉␉␉␉if(strcmp("__text", sect->sectname) == 0)␊ |
484 | ␉␉␉␉␉␉{␊ |
485 | ␉␉␉␉␉␉␉// __TEXT,__text found, save the offset and address for when looking for the calls.␊ |
486 | ␉␉␉␉␉␉␉textSection = sect->offset;␊ |
487 | ␉␉␉␉␉␉␉textAddress = sect->addr;␊ |
488 | ␉␉␉␉␉␉␉␊ |
489 | ␉␉␉␉␉␉␉break;␊ |
490 | ␉␉␉␉␉␉}␉␉␉␉␉␊ |
491 | ␉␉␉␉␉}␊ |
492 | ␉␉␉␉}␊ |
493 | ␉␉␉␉else if(strcmp("__DATA", segCommand->segname) == 0)␊ |
494 | ␉␉␉␉{␊ |
495 | ␉␉␉␉␉UInt32 sectionIndex;␊ |
496 | ␉␉␉␉␉␊ |
497 | ␉␉␉␉␉sectionIndex = sizeof(struct segment_command_64);␊ |
498 | ␉␉␉␉␉␊ |
499 | ␉␉␉␉␉struct section_64 *sect;␊ |
500 | ␉␉␉␉␉␊ |
501 | ␉␉␉␉␉while(sectionIndex < segCommand->cmdsize)␊ |
502 | ␉␉␉␉␉{␊ |
503 | ␉␉␉␉␉␉sect = binary + binaryIndex + sectionIndex;␊ |
504 | ␉␉␉␉␉␉␊ |
505 | ␉␉␉␉␉␉sectionIndex += sizeof(struct section);␊ |
506 | ␉␉␉␉␉␉␊ |
507 | ␉␉␉␉␉␉␊ |
508 | ␉␉␉␉␉␉if(strcmp("__bss", sect->sectname) == 0)␊ |
509 | ␉␉␉␉␉␉{␊ |
510 | ␉␉␉␉␉␉␉// __TEXT,__text found, save the offset and address for when looking for the calls.␊ |
511 | ␉␉␉␉␉␉␉//printf("__DATA,__bss found.\n"); getc();␊ |
512 | ␉␉␉␉␉␉␉break;␊ |
513 | ␉␉␉␉␉␉}␉␉␉␉␉␊ |
514 | ␉␉␉␉␉}␊ |
515 | ␉␉␉␉␉␊ |
516 | ␉␉␉␉}␊ |
517 | ␉␉␉␉␊ |
518 | ␉␉␉␉␊ |
519 | ␉␉␉␉break;␊ |
520 | ␉␉␉␉␊ |
521 | ␉␉␉case LC_DYSYMTAB:␊ |
522 | ␉␉␉␉break;␊ |
523 | ␉␉␉␉␊ |
524 | ␉␉␉case LC_LOAD_DYLIB:␊ |
525 | ␉␉␉case LC_LOAD_WEAK_DYLIB ^ LC_REQ_DYLD:␊ |
526 | ␉␉␉␉dylibCommand = binary + binaryIndex;␊ |
527 | ␉␉␉␉char* module = binary + binaryIndex + ((UInt32)*((UInt32*)&dylibCommand->dylib.name));␊ |
528 | ␉␉␉␉// TODO: verify version␊ |
529 | ␉␉␉␉// =␉dylibCommand->dylib.current_version;␊ |
530 | ␉␉␉␉// =␉dylibCommand->dylib.compatibility_version;␊ |
531 | ␉␉␉␉if(dylib_loader)␊ |
532 | ␉␉␉␉{␊ |
533 | ␉␉␉␉␉char* name = malloc(strlen(module) + strlen(".dylib") + 1);␊ |
534 | ␉␉␉␉␉sprintf(name, "%s.dylib", module);␊ |
535 | ␊ |
536 | ␉␉␉␉␉if (!dylib_loader(name))␊ |
537 | ␉␉␉␉␉{␊ |
538 | ␉␉␉␉␉␉free(name);␊ |
539 | ␉␉␉␉␉␉verbose("Unable to load dependency...\n");␊ |
540 | ␉␉␉␉␉␉//return NULL;␊ |
541 | ␉␉␉␉␉}␊ |
542 | ␉␉␉␉}␊ |
543 | ␊ |
544 | ␉␉␉␉break;␊ |
545 | ␉␉␉␉␊ |
546 | ␉␉␉case LC_ID_DYLIB:␊ |
547 | ␉␉␉␉dylibCommand = binary + binaryIndex;␊ |
548 | ␉␉␉␉/*moduleName =␉binary + binaryIndex + ((UInt32)*((UInt32*)&dylibCommand->dylib.name));␊ |
549 | ␉␉␉␉moduleVersion =␉dylibCommand->dylib.current_version;␊ |
550 | ␉␉␉␉moduleCompat =␉dylibCommand->dylib.compatibility_version;␊ |
551 | ␉␉␉␉ */␊ |
552 | ␉␉␉␉break;␊ |
553 | ␊ |
554 | ␉␉␉case LC_DYLD_INFO:␊ |
555 | ␉␉␉␉// Bind and rebase info is stored here␊ |
556 | ␉␉␉␉dyldInfoCommand = binary + binaryIndex;␊ |
557 | ␉␉␉␉break;␊ |
558 | ␉␉␉␉␊ |
559 | ␉␉␉case LC_UUID:␊ |
560 | ␉␉␉␉break;␊ |
561 | ␉␉␉␉␊ |
562 | ␉␉␉case LC_UNIXTHREAD:␊ |
563 | ␉␉␉␉break;␊ |
564 | ␉␉␉␉␊ |
565 | ␉␉␉default:␊ |
566 | ␉␉␉␉DBG("Unhandled loadcommand 0x%X\n", loadCommand->cmd & 0x7FFFFFFF);␊ |
567 | ␉␉␉␉break;␊ |
568 | ␉␉␊ |
569 | ␉␉}␊ |
570 | ␊ |
571 | ␉␉binaryIndex += cmdSize;␊ |
572 | ␉}␊ |
573 | ␉//if(!moduleName) return NULL;␊ |
574 | ␉␉␊ |
575 | ␊ |
576 | ␉// bind_macho uses the symbols.␊ |
577 | ␉module_start = (void*)handle_symtable((UInt32)binary, symtabCommand, symbol_handler, is64);␊ |
578 | ␊ |
579 | ␉// Rebase the module before binding it.␊ |
580 | ␉if(dyldInfoCommand && dyldInfoCommand->rebase_off)␊ |
581 | ␉{␊ |
582 | ␉␉rebase_macho(binary, (char*)dyldInfoCommand->rebase_off, dyldInfoCommand->rebase_size);␊ |
583 | ␉}␊ |
584 | ␉␊ |
585 | ␉if(dyldInfoCommand && dyldInfoCommand->bind_off)␊ |
586 | ␉{␊ |
587 | ␉␉bind_macho(binary, (char*)dyldInfoCommand->bind_off, dyldInfoCommand->bind_size);␊ |
588 | ␉}␊ |
589 | ␉␊ |
590 | ␉if(dyldInfoCommand && dyldInfoCommand->weak_bind_off)␊ |
591 | ␉{␊ |
592 | ␉␉// NOTE: this currently should never happen.␊ |
593 | ␉␉bind_macho(binary, (char*)dyldInfoCommand->weak_bind_off, dyldInfoCommand->weak_bind_size);␊ |
594 | ␉}␊ |
595 | ␉␊ |
596 | ␉if(dyldInfoCommand && dyldInfoCommand->lazy_bind_off)␊ |
597 | ␉{␊ |
598 | ␉␉// NOTE: we are binding the lazy pointers as a module is laoded,␊ |
599 | ␉␉// This should be changed to bind when a symbol is referened at runtime instead.␊ |
600 | ␉␉bind_macho(binary, (char*)dyldInfoCommand->lazy_bind_off, dyldInfoCommand->lazy_bind_size);␊ |
601 | ␉}␊ |
602 | ␊ |
603 | ␉return module_start;␊ |
604 | ␉␊ |
605 | }␊ |
606 | ␊ |
607 | ␊ |
608 | // Based on code from dylibinfo.cpp and ImageLoaderMachOCompressed.cpp␊ |
609 | void rebase_macho(void* base, char* rebase_stream, UInt32 size)␊ |
610 | {␊ |
611 | ␉rebase_stream += (UInt32)base;␊ |
612 | ␉␊ |
613 | ␉UInt8 immediate = 0;␊ |
614 | ␉UInt8 opcode = 0;␊ |
615 | ␉UInt8 type = 0;␊ |
616 | ␉␊ |
617 | ␉UInt32 segmentAddress = 0;␊ |
618 | ␉␊ |
619 | ␉␊ |
620 | ␉␊ |
621 | ␉UInt32 tmp = 0;␊ |
622 | ␉UInt32 tmp2 = 0;␊ |
623 | ␉UInt8 bits = 0;␊ |
624 | ␉int index = 0;␊ |
625 | ␉␊ |
626 | ␉//int done = 0;␊ |
627 | ␉unsigned int i = 0;␊ |
628 | ␉␊ |
629 | ␉while(/*!done &&*/ i < size)␊ |
630 | ␉{␊ |
631 | ␉␉immediate = rebase_stream[i] & REBASE_IMMEDIATE_MASK;␊ |
632 | ␉␉opcode = rebase_stream[i] & REBASE_OPCODE_MASK;␊ |
633 | ␊ |
634 | ␉␉␊ |
635 | ␉␉switch(opcode)␊ |
636 | ␉␉{␊ |
637 | ␉␉␉case REBASE_OPCODE_DONE:␊ |
638 | ␉␉␉␉// Rebase complete.␊ |
639 | ␉␉␉␉//done = 1;␊ |
640 | ␉␉␉default:␊ |
641 | ␉␉␉␉break;␊ |
642 | ␉␉␉␉␊ |
643 | ␉␉␉␉␊ |
644 | ␉␉␉case REBASE_OPCODE_SET_TYPE_IMM:␊ |
645 | ␉␉␉␉// Set rebase type (pointer, absolute32, pcrel32)␊ |
646 | ␉␉␉␉//DBG("Rebase type = 0x%X\n", immediate);␊ |
647 | ␉␉␉␉type = immediate;␊ |
648 | ␉␉␉␉break;␊ |
649 | ␉␉␉␉␊ |
650 | ␉␉␉␉␊ |
651 | ␉␉␉case REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:␊ |
652 | ␉␉␉␉// Locate address to begin rebasing␊ |
653 | ␉␉␉␉segmentAddress = 0;␊ |
654 | ␊ |
655 | ␉␉␉␉struct segment_command* segCommand = NULL; // NOTE: 32bit only␊ |
656 | ␉␉␉␉␊ |
657 | ␉␉␉␉unsigned int binIndex = 0;␊ |
658 | ␉␉␉␉index = 0;␊ |
659 | ␉␉␉␉do␊ |
660 | ␉␉␉␉{␊ |
661 | ␉␉␉␉␉segCommand = base + sizeof(struct mach_header) + binIndex;␊ |
662 | ␉␉␉␉␉␊ |
663 | ␉␉␉␉␉␊ |
664 | ␉␉␉␉␉binIndex += segCommand->cmdsize;␊ |
665 | ␉␉␉␉␉index++;␊ |
666 | ␉␉␉␉}␊ |
667 | ␉␉␉␉while(index <= immediate);␊ |
668 | ␊ |
669 | ␊ |
670 | ␉␉␉␉segmentAddress = segCommand->fileoff;␊ |
671 | ␉␉␉␉␊ |
672 | ␉␉␉␉tmp = 0;␊ |
673 | ␉␉␉␉bits = 0;␊ |
674 | ␉␉␉␉do␊ |
675 | ␉␉␉␉{␊ |
676 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
677 | ␉␉␉␉␉bits += 7;␊ |
678 | ␉␉␉␉}␊ |
679 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
680 | ␉␉␉␉␊ |
681 | ␉␉␉␉segmentAddress += tmp;␊ |
682 | ␉␉␉␉break;␊ |
683 | ␉␉␉␉␊ |
684 | ␉␉␉␉␊ |
685 | ␉␉␉case REBASE_OPCODE_ADD_ADDR_ULEB:␊ |
686 | ␉␉␉␉// Add value to rebase address␊ |
687 | ␉␉␉␉tmp = 0;␊ |
688 | ␉␉␉␉bits = 0;␊ |
689 | ␉␉␉␉do␊ |
690 | ␉␉␉␉{␊ |
691 | ␉␉␉␉␉tmp <<= bits;␊ |
692 | ␉␉␉␉␉tmp |= rebase_stream[++i] & 0x7f;␊ |
693 | ␉␉␉␉␉bits += 7;␊ |
694 | ␉␉␉␉}␊ |
695 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
696 | ␉␉␉␉␊ |
697 | ␉␉␉␉segmentAddress +=␉tmp; ␊ |
698 | ␉␉␉␉break;␊ |
699 | ␉␉␉␉␊ |
700 | ␉␉␉case REBASE_OPCODE_ADD_ADDR_IMM_SCALED:␊ |
701 | ␉␉␉␉segmentAddress += immediate * sizeof(void*);␊ |
702 | ␉␉␉␉break;␊ |
703 | ␉␉␉␉␊ |
704 | ␉␉␉␉␊ |
705 | ␉␉␉case REBASE_OPCODE_DO_REBASE_IMM_TIMES:␊ |
706 | ␉␉␉␉index = 0;␊ |
707 | ␉␉␉␉for (index = 0; index < immediate; ++index) {␊ |
708 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␊ |
709 | ␉␉␉␉␉segmentAddress += sizeof(void*);␊ |
710 | ␉␉␉␉}␊ |
711 | ␉␉␉␉break;␊ |
712 | ␉␉␉␊ |
713 | ␉␉␉␉␊ |
714 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ULEB_TIMES:␊ |
715 | ␉␉␉␉tmp = 0;␊ |
716 | ␉␉␉␉bits = 0;␊ |
717 | ␉␉␉␉do␊ |
718 | ␉␉␉␉{␊ |
719 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
720 | ␉␉␉␉␉bits += 7;␊ |
721 | ␉␉␉␉}␊ |
722 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
723 | ␉␉␉␉␊ |
724 | ␉␉␉␉index = 0;␊ |
725 | ␉␉␉␉for (index = 0; index < tmp; ++index) {␊ |
726 | ␉␉␉␉␉//DBG("\tRebasing 0x%X\n", segmentAddress);␊ |
727 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␉␉␉␉␉␊ |
728 | ␉␉␉␉␉segmentAddress += sizeof(void*);␊ |
729 | ␉␉␉␉}␊ |
730 | ␉␉␉␉break;␊ |
731 | ␉␉␉␉␊ |
732 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB:␊ |
733 | ␉␉␉␉tmp = 0;␊ |
734 | ␉␉␉␉bits = 0;␊ |
735 | ␉␉␉␉do␊ |
736 | ␉␉␉␉{␊ |
737 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
738 | ␉␉␉␉␉bits += 7;␊ |
739 | ␉␉␉␉}␊ |
740 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
741 | ␉␉␉␉␊ |
742 | ␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␊ |
743 | ␉␉␉␉␊ |
744 | ␉␉␉␉segmentAddress += tmp + sizeof(void*);␊ |
745 | ␉␉␉␉break;␊ |
746 | ␉␉␉␉␊ |
747 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB:␊ |
748 | ␉␉␉␉tmp = 0;␊ |
749 | ␉␉␉␉bits = 0;␊ |
750 | ␉␉␉␉do␊ |
751 | ␉␉␉␉{␊ |
752 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
753 | ␉␉␉␉␉bits += 7;␊ |
754 | ␉␉␉␉}␊ |
755 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
756 | ␉␉␉␉␊ |
757 | ␉␉␉␉␊ |
758 | ␉␉␉␉tmp2 = 0;␊ |
759 | ␉␉␉␉bits = 0;␊ |
760 | ␉␉␉␉do␊ |
761 | ␉␉␉␉{␊ |
762 | ␉␉␉␉␉tmp2 |= (rebase_stream[++i] & 0x7f) << bits;␊ |
763 | ␉␉␉␉␉bits += 7;␊ |
764 | ␉␉␉␉}␊ |
765 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
766 | ␉␉␉␉␊ |
767 | ␉␉␉␉index = 0;␊ |
768 | ␉␉␉␉for (index = 0; index < tmp; ++index) {␊ |
769 | ␊ |
770 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␊ |
771 | ␉␉␉␉␉␊ |
772 | ␉␉␉␉␉segmentAddress += tmp2 + sizeof(void*);␊ |
773 | ␉␉␉␉}␊ |
774 | ␉␉␉␉break;␊ |
775 | ␉␉}␊ |
776 | ␉␉i++;␊ |
777 | ␉}␊ |
778 | }␊ |
779 | ␊ |
780 | // Based on code from dylibinfo.cpp and ImageLoaderMachOCompressed.cpp␊ |
781 | // NOTE: this uses 32bit values, and not 64bit values. ␊ |
782 | // There is apossibility that this could cause issues,␊ |
783 | // however the macho file is 32 bit, so it shouldn't matter too much␊ |
784 | void bind_macho(void* base, char* bind_stream, UInt32 size)␊ |
785 | {␉␊ |
786 | ␉bind_stream += (UInt32)base;␊ |
787 | ␉␊ |
788 | ␉UInt8 immediate = 0;␊ |
789 | ␉UInt8 opcode = 0;␊ |
790 | ␉UInt8 type = 0;␊ |
791 | ␉␊ |
792 | ␉UInt32 segmentAddress = 0;␊ |
793 | ␉␊ |
794 | ␉UInt32 address = 0;␊ |
795 | ␉␊ |
796 | ␉SInt32 addend = 0;␉␉␉// TODO: handle this␊ |
797 | ␉SInt32 libraryOrdinal = 0;␊ |
798 | ␊ |
799 | ␉const char* symbolName = NULL;␊ |
800 | ␉UInt8 symboFlags = 0;␊ |
801 | ␉UInt32 symbolAddr = 0xFFFFFFFF;␊ |
802 | ␉␊ |
803 | ␉// Temperary variables␊ |
804 | ␉UInt8 bits = 0;␊ |
805 | ␉UInt32 tmp = 0;␊ |
806 | ␉UInt32 tmp2 = 0;␊ |
807 | ␉␊ |
808 | ␉UInt32 index = 0;␊ |
809 | ␉//int done = 0;␊ |
810 | ␉unsigned int i = 0;␊ |
811 | ␉␊ |
812 | ␉while(/*!done &&*/ i < size)␊ |
813 | ␉{␊ |
814 | ␉␉immediate = bind_stream[i] & BIND_IMMEDIATE_MASK;␊ |
815 | ␉␉opcode = bind_stream[i] & BIND_OPCODE_MASK;␊ |
816 | ␉␉␊ |
817 | ␉␉␊ |
818 | ␉␉switch(opcode)␊ |
819 | ␉␉{␊ |
820 | ␉␉␉case BIND_OPCODE_DONE:␊ |
821 | ␉␉␉␉//done = 1; ␊ |
822 | ␉␉␉default:␊ |
823 | ␉␉␉␉break;␊ |
824 | ␉␉␉␉␊ |
825 | ␉␉␉case BIND_OPCODE_SET_DYLIB_ORDINAL_IMM:␊ |
826 | ␉␉␉␉libraryOrdinal = immediate;␊ |
827 | ␉␉␉␉//DBG("BIND_OPCODE_SET_DYLIB_ORDINAL_IMM: %d\n", libraryOrdinal);␊ |
828 | ␉␉␉␉break;␊ |
829 | ␉␉␉␉␊ |
830 | ␉␉␉case BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB:␊ |
831 | ␉␉␉␉libraryOrdinal = 0;␊ |
832 | ␉␉␉␉bits = 0;␊ |
833 | ␉␉␉␉do␊ |
834 | ␉␉␉␉{␊ |
835 | ␉␉␉␉␉libraryOrdinal |= (bind_stream[++i] & 0x7f) << bits;␊ |
836 | ␉␉␉␉␉bits += 7;␊ |
837 | ␉␉␉␉}␊ |
838 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
839 | ␉␉␉␉␊ |
840 | ␉␉␉␉//DBG("BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB: %d\n", libraryOrdinal);␊ |
841 | ␊ |
842 | ␉␉␉␉break;␊ |
843 | ␉␉␉␉␊ |
844 | ␉␉␉case BIND_OPCODE_SET_DYLIB_SPECIAL_IMM:␊ |
845 | ␉␉␉␉// NOTE: this is wrong, fortunately we don't use it␊ |
846 | ␉␉␉␉libraryOrdinal = immediate ? (SInt8)(BIND_OPCODE_MASK | immediate) : immediate;␉␉␉␉␊ |
847 | ␉␉␉␉//DBG("BIND_OPCODE_SET_DYLIB_SPECIAL_IMM: %d\n", libraryOrdinal);␊ |
848 | ␊ |
849 | ␉␉␉␉break;␊ |
850 | ␉␉␉␉␊ |
851 | ␉␉␉case BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:␊ |
852 | ␉␉␉␉symboFlags = immediate;␊ |
853 | ␉␉␉␉symbolName = (char*)&bind_stream[++i];␊ |
854 | ␉␉␉␉i += strlen((char*)&bind_stream[i]);␊ |
855 | ␉␉␉␉//DBG("BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM: %s, 0x%X\n", symbolName, symboFlags);␊ |
856 | ␊ |
857 | ␉␉␉␉symbolAddr = lookup_all_symbols(symbolName);␊ |
858 | ␊ |
859 | ␉␉␉␉break;␊ |
860 | ␉␉␉␉␊ |
861 | ␉␉␉case BIND_OPCODE_SET_TYPE_IMM:␊ |
862 | ␉␉␉␉// Set bind type (pointer, absolute32, pcrel32)␊ |
863 | ␉␉␉␉type = immediate;␊ |
864 | ␉␉␉␉//DBG("BIND_OPCODE_SET_TYPE_IMM: %d\n", type);␊ |
865 | ␊ |
866 | ␉␉␉␉break;␊ |
867 | ␉␉␉␉␊ |
868 | ␉␉␉case BIND_OPCODE_SET_ADDEND_SLEB:␊ |
869 | ␉␉␉␉addend = 0;␊ |
870 | ␉␉␉␉bits = 0;␊ |
871 | ␉␉␉␉do␊ |
872 | ␉␉␉␉{␊ |
873 | ␉␉␉␉␉addend |= (bind_stream[++i] & 0x7f) << bits;␊ |
874 | ␉␉␉␉␉bits += 7;␊ |
875 | ␉␉␉␉}␊ |
876 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
877 | ␉␉␉␉␊ |
878 | ␉␉␉␉if(!(bind_stream[i-1] & 0x40)) addend *= -1;␊ |
879 | ␉␉␉␉␊ |
880 | ␉␉␉␉//DBG("BIND_OPCODE_SET_ADDEND_SLEB: %d\n", addend);␊ |
881 | ␉␉␉␉break;␊ |
882 | ␉␉␉␉␊ |
883 | ␉␉␉case BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:␊ |
884 | ␉␉␉␉segmentAddress = 0;␊ |
885 | ␊ |
886 | ␉␉␉␉// Locate address␊ |
887 | ␉␉␉␉struct segment_command* segCommand = NULL;␉// NOTE: 32bit only␊ |
888 | ␉␉␉␉␊ |
889 | ␉␉␉␉unsigned int binIndex = 0;␊ |
890 | ␉␉␉␉index = 0;␊ |
891 | ␉␉␉␉do␊ |
892 | ␉␉␉␉{␊ |
893 | ␉␉␉␉␉segCommand = base + sizeof(struct mach_header) + binIndex;␊ |
894 | ␉␉␉␉␉binIndex += segCommand->cmdsize;␊ |
895 | ␉␉␉␉␉index++;␊ |
896 | ␉␉␉␉}␊ |
897 | ␉␉␉␉while(index <= immediate);␊ |
898 | ␉␉␉␉␊ |
899 | ␉␉␉␉segmentAddress = segCommand->fileoff;␊ |
900 | ␉␉␉␉␊ |
901 | ␉␉␉␉// Read in offset␊ |
902 | ␉␉␉␉tmp = 0;␊ |
903 | ␉␉␉␉bits = 0;␊ |
904 | ␉␉␉␉do␊ |
905 | ␉␉␉␉{␊ |
906 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
907 | ␉␉␉␉␉bits += 7;␊ |
908 | ␉␉␉␉}␊ |
909 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
910 | ␉␉␉␉␊ |
911 | ␉␉␉␉segmentAddress += tmp;␊ |
912 | ␉␉␉␉␊ |
913 | ␉␉␉␉//DBG("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: 0x%X\n", segmentAddress);␊ |
914 | ␉␉␉␉break;␊ |
915 | ␉␉␉␉␊ |
916 | ␉␉␉case BIND_OPCODE_ADD_ADDR_ULEB:␊ |
917 | ␉␉␉␉// Read in offset␊ |
918 | ␉␉␉␉tmp = 0;␊ |
919 | ␉␉␉␉bits = 0;␊ |
920 | ␉␉␉␉do␊ |
921 | ␉␉␉␉{␊ |
922 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
923 | ␉␉␉␉␉bits += 7;␊ |
924 | ␉␉␉␉}␊ |
925 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
926 | ␉␉␉␉␊ |
927 | ␉␉␉␉segmentAddress += tmp;␊ |
928 | ␉␉␉␉//DBG("BIND_OPCODE_ADD_ADDR_ULEB: 0x%X\n", segmentAddress);␊ |
929 | ␉␉␉␉break;␊ |
930 | ␉␉␉␉␊ |
931 | ␉␉␉case BIND_OPCODE_DO_BIND:␊ |
932 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND\n");␊ |
933 | ␉␉␉␉if(libraryOrdinal == BIND_SPECIAL_DYLIB_FLAT_LOOKUP && type == BIND_TYPE_POINTER)␊ |
934 | ␉␉␉␉{␊ |
935 | ␉␉␉␉␉// HACK(ish)␊ |
936 | ␉␉␉␉␉// Internal symbol, don't bind␊ |
937 | ␉␉␉␉}␊ |
938 | ␉␉␉␉else␊ |
939 | ␉␉␉␉{␊ |
940 | ␉␉␉␉␉//printf("Binding symbol %s, libraryOrdinal = %d, symboFlags = %d, type = %d\n", symbolName, libraryOrdinal, symboFlags, type);␊ |
941 | ␉␉␉␉␉␊ |
942 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
943 | ␉␉␉␉{␊ |
944 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
945 | ␊ |
946 | ␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, BIND_TYPE_POINTER);␊ |
947 | ␉␉␉␉}␊ |
948 | ␉␉␉␉else //if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
949 | ␉␉␉␉{␊ |
950 | ␉␉␉␉␉verbose("Unable to bind symbol %s, libraryOrdinal = %d, symboFlags = %d, type = %d\n", symbolName, libraryOrdinal, symboFlags, type);␊ |
951 | ␉␉␉␉␉getc();␊ |
952 | ␉␉␉␉}␊ |
953 | ␉␉␉␉}␊ |
954 | ␉␉␉␉␊ |
955 | ␉␉␉␉segmentAddress += sizeof(void*);␊ |
956 | ␉␉␉␉break;␊ |
957 | ␉␉␉␉␊ |
958 | ␉␉␉case BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:␊ |
959 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB\n");␊ |
960 | ␉␉␉␉␊ |
961 | ␉␉␉␉␊ |
962 | ␉␉␉␉// Read in offset␊ |
963 | ␉␉␉␉tmp = 0;␊ |
964 | ␉␉␉␉bits = 0;␊ |
965 | ␉␉␉␉do␊ |
966 | ␉␉␉␉{␊ |
967 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
968 | ␉␉␉␉␉bits += 7;␊ |
969 | ␉␉␉␉}␊ |
970 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
971 | ␉␉␉␉␊ |
972 | ␉␉␉␉␊ |
973 | ␉␉␉␉if(libraryOrdinal == BIND_SPECIAL_DYLIB_FLAT_LOOKUP && type == BIND_TYPE_POINTER)␊ |
974 | ␉␉␉␉{␊ |
975 | ␉␉␉␉␉// Internal symbol, don't bind␊ |
976 | ␉␉␉␉}␊ |
977 | ␉␉␉␉else␊ |
978 | ␉␉␉␉{␊ |
979 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
980 | ␉␉␉␉{␊ |
981 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
982 | ␊ |
983 | ␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, BIND_TYPE_POINTER);␊ |
984 | ␉␉␉␉}␊ |
985 | ␉␉␉␉else //if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
986 | ␉␉␉␉{␊ |
987 | ␉␉␉␉␉verbose("Unable to bind symbol %s\n", symbolName);␊ |
988 | ␉␉␉␉␉getc();␊ |
989 | ␉␉␉␉}␊ |
990 | ␉␉␉␉}␊ |
991 | ␉␉␉␉segmentAddress += tmp + sizeof(void*);␊ |
992 | ␊ |
993 | ␉␉␉␉␊ |
994 | ␉␉␉␉break;␊ |
995 | ␉␉␉␉␊ |
996 | ␉␉␉case BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED:␊ |
997 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED\n");␊ |
998 | ␉␉␉␉if(libraryOrdinal == BIND_SPECIAL_DYLIB_FLAT_LOOKUP && type == BIND_TYPE_POINTER)␊ |
999 | ␉␉␉␉{␊ |
1000 | ␉␉␉␉␉// Internal symbol, don't bind␊ |
1001 | ␉␉␉␉}␊ |
1002 | ␉␉␉␉else␊ |
1003 | ␉␉␉␉{␊ |
1004 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
1005 | ␉␉␉␉{␊ |
1006 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
1007 | ␊ |
1008 | ␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, BIND_TYPE_POINTER);␊ |
1009 | ␉␉␉␉}␊ |
1010 | ␉␉␉␉else //if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
1011 | ␉␉␉␉{␊ |
1012 | ␉␉␉␉␉verbose("Unable to bind symbol %s\n", symbolName);␊ |
1013 | ␉␉␉␉␉getc();␊ |
1014 | ␉␉␉␉}␊ |
1015 | ␉␉␉␉}␊ |
1016 | ␉␉␉␉segmentAddress += (immediate * sizeof(void*)) + sizeof(void*);␊ |
1017 | ␊ |
1018 | ␉␉␉␉␊ |
1019 | ␉␉␉␉break;␊ |
1020 | ␉␉␉␉␊ |
1021 | ␉␉␉case BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:␊ |
1022 | ␊ |
1023 | ␉␉␉␉tmp = 0;␊ |
1024 | ␉␉␉␉bits = 0;␊ |
1025 | ␉␉␉␉do␊ |
1026 | ␉␉␉␉{␊ |
1027 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
1028 | ␉␉␉␉␉bits += 7;␊ |
1029 | ␉␉␉␉}␊ |
1030 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
1031 | ␊ |
1032 | ␉␉␉␉␊ |
1033 | ␉␉␉␉tmp2 = 0;␊ |
1034 | ␉␉␉␉bits = 0;␊ |
1035 | ␉␉␉␉do␊ |
1036 | ␉␉␉␉{␊ |
1037 | ␉␉␉␉␉tmp2 |= (bind_stream[++i] & 0x7f) << bits;␊ |
1038 | ␉␉␉␉␉bits += 7;␊ |
1039 | ␉␉␉␉}␊ |
1040 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
1041 | ␉␉␉␉␊ |
1042 | ␉␉␉␉␊ |
1043 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB 0x%X 0x%X\n", tmp, tmp2);␊ |
1044 | ␊ |
1045 | ␉␉␉␉␊ |
1046 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
1047 | ␉␉␉␉{␊ |
1048 | ␉␉␉␉␉for(index = 0; index < tmp; index++)␊ |
1049 | ␉␉␉␉␉{␊ |
1050 | ␉␉␉␉␉␉␊ |
1051 | ␉␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
1052 | ␉␉␉␉␉␉if(libraryOrdinal == BIND_SPECIAL_DYLIB_FLAT_LOOKUP && type == BIND_TYPE_POINTER)␊ |
1053 | ␉␉␉␉␉␉{␊ |
1054 | ␉␉␉␉␉␉␉// Internal symbol, don't bind␊ |
1055 | ␉␉␉␉␉␉}␊ |
1056 | ␉␉␉␉␉␉else␊ |
1057 | ␉␉␉␉␉␉{␊ |
1058 | ␊ |
1059 | ␉␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, BIND_TYPE_POINTER);␊ |
1060 | ␉␉␉␉␉␉}␉␉␉␉␉␉␊ |
1061 | ␉␉␉␉␉␉segmentAddress += tmp2 + sizeof(void*);␊ |
1062 | ␉␉␉␉␉}␊ |
1063 | ␉␉␉␉}␊ |
1064 | ␉␉␉␉else␊ |
1065 | ␉␉␉␉{␊ |
1066 | ␉␉␉␉␉if(libraryOrdinal == BIND_SPECIAL_DYLIB_FLAT_LOOKUP && type == BIND_TYPE_POINTER)␊ |
1067 | ␉␉␉␉␉{␊ |
1068 | ␉␉␉␉␉␉// Internal symbol, don't bind␊ |
1069 | ␉␉␉␉␉}␊ |
1070 | ␉␉␉␉␉else␊ |
1071 | ␉␉␉␉␉{␉␉␉␉␉␉␊ |
1072 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
1073 | ␉␉␉␉␉getc();␊ |
1074 | ␉␉␉␉}␊ |
1075 | ␉␉␉␉}␊ |
1076 | ␉␉␉␉␊ |
1077 | ␉␉␉␉␊ |
1078 | ␉␉␉␉break;␊ |
1079 | ␉␉␉␉␊ |
1080 | ␉␉}␊ |
1081 | ␉␉i++;␊ |
1082 | ␉}␊ |
1083 | }␊ |
1084 | ␊ |
1085 | inline void rebase_location(UInt32* location, char* base, int type)␊ |
1086 | {␉␊ |
1087 | ␉switch(type)␊ |
1088 | ␉{␊ |
1089 | ␉␉case REBASE_TYPE_POINTER:␊ |
1090 | ␉␉case REBASE_TYPE_TEXT_ABSOLUTE32:␊ |
1091 | ␉␉␉*location += (UInt32)base;␊ |
1092 | ␉␉␉break;␊ |
1093 | ␉␉␉␊ |
1094 | ␉␉default:␊ |
1095 | ␉␉␉break;␊ |
1096 | ␉}␊ |
1097 | }␊ |
1098 | ␊ |
1099 | inline void bind_location(UInt32* location, char* value, UInt32 addend, int type)␊ |
1100 | {␉␊ |
1101 | ␉// do actual update␊ |
1102 | ␉char* newValue = value + addend;␊ |
1103 | ␊ |
1104 | ␉switch (type) {␊ |
1105 | ␉␉case BIND_TYPE_POINTER:␊ |
1106 | ␉␉case BIND_TYPE_TEXT_ABSOLUTE32:␊ |
1107 | ␉␉␉break;␊ |
1108 | ␊ |
1109 | ␉␉case BIND_TYPE_TEXT_PCREL32:␊ |
1110 | ␉␉␉newValue -= ((UInt32)location + 4);␊ |
1111 | ␊ |
1112 | ␉␉␉break;␊ |
1113 | ␉␉default:␊ |
1114 | ␉␉␉return;␊ |
1115 | ␉}␊ |
1116 | ␉␊ |
1117 | ␉*location = (UInt32)newValue;␊ |
1118 | }␊ |
1119 | ␊ |
1120 | ␊ |
1121 | /*␊ |
1122 | * add_symbol␊ |
1123 | * This function adds a symbol from a module to the list of known symbols ␊ |
1124 | * possibly change to a pointer and add this to the Symbol module so that it can␊ |
1125 | * adjust it's internal symbol list (sort) to optimize locating new symbols␊ |
1126 | * NOTE: returns the address if the symbol is "start", else returns 0xFFFFFFFF␊ |
1127 | */␊ |
1128 | long long add_symbol(char* symbol, long long addr, char is64)␊ |
1129 | {␊ |
1130 | ␉if(is64) return 0xFFFFFFFF; // Fixme␊ |
1131 | ␊ |
1132 | ␉// This only can handle 32bit symbols ␊ |
1133 | ␉symbolList_t* entry;␊ |
1134 | ␉//DBG("Adding symbol %s at 0x%X\n", symbol, addr);␊ |
1135 | ␉␊ |
1136 | ␉if(!moduleSymbols)␊ |
1137 | ␉{␊ |
1138 | ␉␉moduleSymbols = entry = malloc(sizeof(symbolList_t));␊ |
1139 | ␊ |
1140 | ␉}␊ |
1141 | ␉else␊ |
1142 | ␉{␊ |
1143 | ␉␉entry = moduleSymbols;␊ |
1144 | ␉␉while(entry->next)␊ |
1145 | ␉␉{␊ |
1146 | ␉␉␉entry = entry->next;␊ |
1147 | ␉␉}␊ |
1148 | ␉␉␊ |
1149 | ␉␉entry->next = malloc(sizeof(symbolList_t));␊ |
1150 | ␉␉entry = entry->next;␊ |
1151 | ␉}␊ |
1152 | ␊ |
1153 | ␉entry->next = NULL;␊ |
1154 | ␉entry->addr = (UInt32)addr;␊ |
1155 | ␉entry->symbol = symbol;␊ |
1156 | ␉␊ |
1157 | ␉if(strcmp(symbol, "start") == 0)␊ |
1158 | ␉{␊ |
1159 | ␉␉return addr;␊ |
1160 | ␉}␊ |
1161 | ␉else␊ |
1162 | ␉{␊ |
1163 | ␉␉return 0xFFFFFFFF; // fixme␊ |
1164 | ␉}␊ |
1165 | }␊ |
1166 | ␊ |
1167 | ␊ |
1168 | /*␊ |
1169 | * print out the information about the loaded module␊ |
1170 | ␊ |
1171 | */␊ |
1172 | void module_loaded(const char* name/*, UInt32 version, UInt32 compat*/)␊ |
1173 | {␊ |
1174 | ␉// TODO: insert sorted␊ |
1175 | ␉moduleList_t* new_entry = malloc(sizeof(moduleList_t));␊ |
1176 | ␊ |
1177 | ␉new_entry->next = loadedModules;␊ |
1178 | ␉loadedModules = new_entry;␊ |
1179 | ␉␊ |
1180 | ␉new_entry->module = (char*)name;␊ |
1181 | ␉new_entry->version = 0; //version;␊ |
1182 | ␉new_entry->compat = 0; //compat;␊ |
1183 | }␊ |
1184 | ␊ |
1185 | int is_module_loaded(const char* name)␊ |
1186 | {␊ |
1187 | ␉// todo sorted search␊ |
1188 | ␉moduleList_t* entry = loadedModules;␊ |
1189 | ␉while(entry)␊ |
1190 | ␉{␊ |
1191 | ␉␉DBG("Comparing %s with %s\n", name, entry->module);␊ |
1192 | ␉␉if(strcmp(entry->module, name) == 0)␊ |
1193 | ␉␉{␊ |
1194 | ␉␉␉DBG("Located module %s\n", name);␊ |
1195 | ␉␉␉return 1;␊ |
1196 | ␉␉}␊ |
1197 | ␉␉else␊ |
1198 | ␉␉{␊ |
1199 | ␉␉␉entry = entry->next;␊ |
1200 | ␉␉}␊ |
1201 | ␊ |
1202 | ␉}␊ |
1203 | ␉DBG("Module %s not found\n", name);␊ |
1204 | ␊ |
1205 | ␉return 0;␊ |
1206 | }␊ |
1207 | ␊ |
1208 | // Look for symbols using the Smbols moduel function.␊ |
1209 | // If non are found, look through the list of module symbols␊ |
1210 | unsigned int lookup_all_symbols(const char* name)␊ |
1211 | {␊ |
1212 | ␉unsigned int addr = 0xFFFFFFFF;␊ |
1213 | ␉symbolList_t* entry = moduleSymbols;␊ |
1214 | ␉while(entry)␊ |
1215 | ␉{␊ |
1216 | ␉␉if(strcmp(entry->symbol, name) == 0)␊ |
1217 | ␉␉{␊ |
1218 | ␉␉␉//DBG("External symbol %s located at 0x%X\n", name, entry->addr);␊ |
1219 | ␉␉␉return entry->addr;␊ |
1220 | ␉␉}␊ |
1221 | ␉␉else␊ |
1222 | ␉␉{␊ |
1223 | ␉␉␉entry = entry->next;␊ |
1224 | ␉␉}␊ |
1225 | ␊ |
1226 | ␉}␊ |
1227 | ␉␊ |
1228 | ␉if(lookup_symbol && (UInt32)lookup_symbol != 0xFFFFFFFF)␊ |
1229 | ␉{␊ |
1230 | ␉␉addr = lookup_symbol(name);␊ |
1231 | ␉␉if(addr != 0xFFFFFFFF)␊ |
1232 | ␉␉{␊ |
1233 | ␉␉␉//DBG("Internal symbol %s located at 0x%X\n", name, addr);␊ |
1234 | ␉␉␉return addr;␊ |
1235 | ␉␉}␊ |
1236 | ␉}␊ |
1237 | ␉␊ |
1238 | ␊ |
1239 | #if DEBUG_MODULES␊ |
1240 | ␉␉verbose("Unable to locate symbol %s\n", name);␊ |
1241 | ␉␉getc();␊ |
1242 | #endif␊ |
1243 | ␉return 0xFFFFFFFF;␊ |
1244 | }␊ |
1245 | ␊ |
1246 | ␊ |
1247 | /*␊ |
1248 | * parse the symbol table␊ |
1249 | * Lookup any undefined symbols␊ |
1250 | */␊ |
1251 | ␊ |
1252 | unsigned int handle_symtable(UInt32 base, struct symtab_command* symtabCommand, long long(*symbol_handler)(char*, long long, char), char is64)␊ |
1253 | {␊ |
1254 | ␉// TODO: verify that the _TEXT,_text segment starts at the same locaiton in the file. If not␊ |
1255 | ␉//␉␉␉subtract the vmaddress and add the actual file address back on. (NOTE: if compiled properly, not needed)␊ |
1256 | ␉␊ |
1257 | ␉unsigned int module_start = 0xFFFFFFFF;␊ |
1258 | ␉␊ |
1259 | ␉UInt32 symbolIndex = 0;␊ |
1260 | ␉char* symbolString = base + (char*)symtabCommand->stroff;␊ |
1261 | ␉//char* symbolTable = base + symtabCommand->symoff;␊ |
1262 | ␉if(!is64)␊ |
1263 | ␉{␊ |
1264 | ␉␉struct nlist* symbolEntry = (void*)base + symtabCommand->symoff;␊ |
1265 | ␉␉while(symbolIndex < symtabCommand->nsyms)␊ |
1266 | ␉␉{␊ |
1267 | ␉␉␉// If the symbol is exported by this module␊ |
1268 | ␉␉␉if(symbolEntry->n_value &&␊ |
1269 | ␉␉␉ symbol_handler(symbolString + symbolEntry->n_un.n_strx, (long long)base + symbolEntry->n_value, is64) != 0xFFFFFFFF)␊ |
1270 | ␉␉␉{␊ |
1271 | ␉␉␉␉␊ |
1272 | ␉␉␉␉// Module start located. Start is an alias so don't register it␊ |
1273 | ␉␉␉␉module_start = base + symbolEntry->n_value;␊ |
1274 | ␉␉␉}␊ |
1275 | ␉␉␉␊ |
1276 | ␉␉␉symbolEntry++;␊ |
1277 | ␉␉␉symbolIndex++;␉// TODO remove␊ |
1278 | ␉␉}␊ |
1279 | ␉}␊ |
1280 | ␉else␊ |
1281 | ␉{␊ |
1282 | ␉␉struct nlist_64* symbolEntry = (void*)base + symtabCommand->symoff;␊ |
1283 | ␉␉// NOTE First entry is *not* correct, but we can ignore it (i'm getting radar:// right now)␉␊ |
1284 | ␉␉while(symbolIndex < symtabCommand->nsyms)␊ |
1285 | ␉␉{␊ |
1286 | ␉␉␉␊ |
1287 | ␉␉␉␊ |
1288 | ␉␉␉// If the symbol is exported by this module␊ |
1289 | ␉␉␉if(symbolEntry->n_value &&␊ |
1290 | ␉␉␉ symbol_handler(symbolString + symbolEntry->n_un.n_strx, (long long)base + symbolEntry->n_value, is64) != 0xFFFFFFFF)␊ |
1291 | ␉␉␉{␊ |
1292 | ␉␉␉␉␊ |
1293 | ␉␉␉␉// Module start located. Start is an alias so don't register it␊ |
1294 | ␉␉␉␉module_start = base + symbolEntry->n_value;␊ |
1295 | ␉␉␉}␊ |
1296 | ␉␉␉␊ |
1297 | ␉␉␉symbolEntry++;␊ |
1298 | ␉␉␉symbolIndex++;␉// TODO remove␊ |
1299 | ␉␉}␊ |
1300 | ␉}␊ |
1301 | ␉␉␊ |
1302 | ␉return module_start;␊ |
1303 | ␉␊ |
1304 | }␊ |
1305 | ␊ |
1306 | ␊ |
1307 | /*␊ |
1308 | * Locate the symbol for an already loaded function and modify the beginning of␊ |
1309 | * the function to jump directly to the new one␊ |
1310 | * example: replace_function("_HelloWorld_start", &replacement_start);␊ |
1311 | */␊ |
1312 | int replace_function(const char* symbol, void* newAddress)␊ |
1313 | {␊ |
1314 | ␉UInt32* jumpPointer = malloc(sizeof(UInt32*));␉ ␊ |
1315 | ␉// TODO: look into using the next four bytes of the function instead␊ |
1316 | ␉// Most functions should support this, as they probably will be at ␊ |
1317 | ␉// least 10 bytes long, but you never know, this is sligtly safer as␊ |
1318 | ␉// function can be as small as 6 bytes.␊ |
1319 | ␉UInt32 addr = lookup_all_symbols(symbol);␊ |
1320 | ␉␊ |
1321 | ␉char* binary = (char*)addr;␊ |
1322 | ␉if(addr != 0xFFFFFFFF)␊ |
1323 | ␉{␊ |
1324 | ␉␉DBG("Replacing %s to point to 0x%x\n", symbol, newAddress);␊ |
1325 | ␉␉*binary++ = 0xFF;␉// Jump␊ |
1326 | ␉␉*binary++ = 0x25;␉// Long Jump␊ |
1327 | ␉␉*((UInt32*)binary) = (UInt32)jumpPointer;␊ |
1328 | ␉␉␊ |
1329 | ␉␉*jumpPointer = (UInt32)newAddress;␊ |
1330 | ␉␉␊ |
1331 | ␉␉return 1;␊ |
1332 | ␉}␊ |
1333 | ␉else ␊ |
1334 | ␉{␊ |
1335 | ␉␉return 0;␊ |
1336 | ␉}␊ |
1337 | ␊ |
1338 | }␊ |
1339 | ␊ |
1340 | void dyld_stub_binder()␊ |
1341 | {␊ |
1342 | ␉// TODO: actualy impliment this function (asm)␊ |
1343 | ␉stop("ERROR: dyld_stub_binder was called, should have been take care of by the linker.\n");␊ |
1344 | } |