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Source at commit 554 created 13 years 7 months ago. By meklort, Grapics enabler enabled by default. removed device_numbers. | |
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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 | // NOTE: Global so that modules can link with this␊ |
22 | unsigned long long textAddress = 0;␊ |
23 | unsigned long long textSection = 0;␊ |
24 | ␊ |
25 | moduleHook_t* moduleCallbacks = NULL;␊ |
26 | moduleList_t* loadedModules = NULL;␊ |
27 | symbolList_t* moduleSymbols = NULL;␊ |
28 | unsigned int (*lookup_symbol)(const char*) = NULL;␊ |
29 | ␊ |
30 | ␊ |
31 | ␊ |
32 | ␊ |
33 | ␊ |
34 | #if DEBUG_MODULES␊ |
35 | void print_hook_list()␊ |
36 | {␊ |
37 | ␉moduleHook_t* hooks = moduleCallbacks;␊ |
38 | ␉while(hooks)␊ |
39 | ␉{␊ |
40 | ␉␉printf("Hook: %s\n", hooks->name);␊ |
41 | ␉␉hooks = hooks->next;␊ |
42 | ␉}␊ |
43 | }␊ |
44 | #endif␊ |
45 | ␊ |
46 | /*␊ |
47 | * Initialize the module system by loading the Symbols.dylib module.␊ |
48 | * Once loaded, locate the _lookup_symbol function so that internal␊ |
49 | * symbols can be resolved.␊ |
50 | */␊ |
51 | int init_module_system()␊ |
52 | {␊ |
53 | ␉// Intialize module system␊ |
54 | ␉if(load_module(SYMBOLS_MODULE))␊ |
55 | ␉{␊ |
56 | ␉␉lookup_symbol = (void*)lookup_all_symbols(SYMBOL_LOOKUP_SYMBOL);␊ |
57 | ␉␉␊ |
58 | ␉␉if((UInt32)lookup_symbol != 0xFFFFFFFF)␊ |
59 | ␉␉{␊ |
60 | ␉␉␉return 1;␊ |
61 | ␉␉}␊ |
62 | ␉␉␊ |
63 | ␉}␊ |
64 | ␉␊ |
65 | ␉return 0;␊ |
66 | }␊ |
67 | ␊ |
68 | ␊ |
69 | /*␊ |
70 | * Load all modules in the /Extra/modules/ directory␊ |
71 | * Module depencdies will be loaded first␊ |
72 | * MOdules will only be loaded once. When loaded a module must␊ |
73 | * setup apropriete function calls and hooks as required.␊ |
74 | * NOTE: To ensure a module loads after another you may ␊ |
75 | * link one module with the other. For dyld to allow this, you must␊ |
76 | * reference at least one symbol within the module.␊ |
77 | */␊ |
78 | void load_all_modules()␊ |
79 | {␊ |
80 | ␉char* name;␊ |
81 | ␉long flags;␊ |
82 | ␉long time;␊ |
83 | ␉struct dirstuff* moduleDir = opendir("/Extra/modules/");␊ |
84 | ␉while(readdir(moduleDir, (const char**)&name, &flags, &time) >= 0)␊ |
85 | ␉{␊ |
86 | ␉␉if(strcmp(&name[strlen(name) - sizeof("dylib")], ".dylib") == 0)␊ |
87 | ␉␉{␊ |
88 | ␉␉␉char* tmp = malloc(strlen(name) + 1);␊ |
89 | ␉␉␉strcpy(tmp, name);␊ |
90 | ␉␉␉␊ |
91 | ␉␉␉DBG("Attempting to load %s\n", tmp);␉␉␉␊ |
92 | ␉␉␉load_module(tmp);␊ |
93 | ␉␉}␊ |
94 | ␉␉else ␊ |
95 | ␉␉{␊ |
96 | ␉␉␉DBG("Ignoring %s\n", name);␊ |
97 | ␉␉}␊ |
98 | ␊ |
99 | ␉}␊ |
100 | }␊ |
101 | ␊ |
102 | ␊ |
103 | /*␊ |
104 | * Load a module file in /Extra/modules␊ |
105 | * TODO: verify version number of module␊ |
106 | */␊ |
107 | int load_module(char* module)␊ |
108 | {␊ |
109 | ␉void (*module_start)(void) = NULL;␊ |
110 | ␊ |
111 | ␉␊ |
112 | ␉// Check to see if the module has already been loaded␊ |
113 | ␉if(is_module_loaded(module))␊ |
114 | ␉{␊ |
115 | ␉␉// NOTE: Symbols.dylib tries to load twice, this catches it as well␊ |
116 | ␉␉// as when a module links with an already loaded module␊ |
117 | ␉␉DBG("Module %s already loaded\n", module);␊ |
118 | ␉␉return 1;␊ |
119 | ␉}␊ |
120 | ␉␊ |
121 | ␉char modString[128];␊ |
122 | ␉int fh = -1;␊ |
123 | ␉sprintf(modString, "/Extra/modules/%s", module);␊ |
124 | ␉fh = open(modString, 0);␊ |
125 | ␉if(fh < 0)␊ |
126 | ␉{␊ |
127 | ␉␉printf("Unable to locate module %s\n", modString);␊ |
128 | ␉␉getc();␊ |
129 | ␉␉return 0;␊ |
130 | ␉}␊ |
131 | ␉␊ |
132 | ␉unsigned int moduleSize = file_size(fh);␊ |
133 | ␉char* module_base = (char*) malloc(moduleSize);␊ |
134 | ␉if (moduleSize && read(fh, module_base, moduleSize) == moduleSize)␊ |
135 | ␉{␊ |
136 | ␊ |
137 | ␉␉//printf("Module %s read in.\n", modString);␊ |
138 | ␊ |
139 | ␉␉// Module loaded into memory, parse it␊ |
140 | ␉␉module_start = parse_mach(module_base, &load_module, &add_symbol);␊ |
141 | ␊ |
142 | ␉␉if(module_start && module_start != (void*)0xFFFFFFFF)␊ |
143 | ␉␉{␊ |
144 | ␉␉␉// Notify the system that it was laoded␊ |
145 | ␉␉␉module_loaded(module/*moduleName, moduleVersion, moduleCompat*/);␊ |
146 | ␉␉␉(*module_start)();␉// Start the module␊ |
147 | ␉␉␉DBG("Module %s Loaded.\n", module);␊ |
148 | ␉␉}␊ |
149 | ␉␉else {␊ |
150 | ␉␉␉// The module does not have a valid start function␊ |
151 | ␉␉␉printf("Unable to start %s\n", module);␊ |
152 | ␉␉␉getc();␊ |
153 | ␉␉}␉␉␊ |
154 | ␉}␊ |
155 | ␉else␊ |
156 | ␉{␊ |
157 | ␉␉DBG("Unable to read in module %s\n.", module);␊ |
158 | ␉␉getc();␊ |
159 | ␉}␊ |
160 | ␉close(fh);␊ |
161 | ␉return 1;␊ |
162 | }␊ |
163 | ␊ |
164 | /*␊ |
165 | *␉execute_hook( const char* name )␊ |
166 | *␉␉name - Name of the module hook␊ |
167 | *␉␉␉If any callbacks have been registered for this hook␊ |
168 | *␉␉␉they will be executed now in the same order that the␊ |
169 | *␉␉␉hooks were added.␊ |
170 | */␊ |
171 | int execute_hook(const char* name, void* arg1, void* arg2, void* arg3, void* arg4)␊ |
172 | {␊ |
173 | ␉DBG("Attempting to execute hook '%s'\n", name);␊ |
174 | ␊ |
175 | ␉if(moduleCallbacks != NULL)␊ |
176 | ␉{␊ |
177 | ␉␉moduleHook_t* hooks = moduleCallbacks;␊ |
178 | ␉␉␊ |
179 | ␊ |
180 | ␉␉while(hooks != NULL && strcmp(name, hooks->name) != 0) //TOOD: fixme␊ |
181 | ␉␉{␊ |
182 | ␉␉␉//DBG("%s cmp %s = %d\n", name, hooks->name, strcmp(name, hooks->name));␊ |
183 | ␉␉␉hooks = hooks->next;␊ |
184 | ␉␉}␊ |
185 | ␊ |
186 | ␉␉if(strcmp(name, hooks->name) == 0)␊ |
187 | ␉␉{␊ |
188 | ␉␉␉// Loop through all callbacks for this module␊ |
189 | ␉␉␉callbackList_t* callbacks = hooks->callbacks;␊ |
190 | ␉␉␉␊ |
191 | ␉␉␉while(callbacks)␊ |
192 | ␉␉␉{␊ |
193 | ␉␉␉␉DBG("Executing '%s' with callback 0x%X.\n", name, callbacks->callback);␊ |
194 | ␉␉␉␉// Execute callback␊ |
195 | ␉␉␉␉callbacks->callback(arg1, arg2, arg3, arg4);␊ |
196 | ␉␉␉␉callbacks = callbacks->next;␊ |
197 | ␉␉␉␉DBG("Hook '%s' callback executed, next is 0x%X.\n", name, callbacks);␊ |
198 | ␊ |
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. When registering a new callback name, the callback is added sorted.␊ |
227 | *␉␉␉NOTE: the hooks take four void* arguments.␊ |
228 | *␉␉␉TODO: refactor␊ |
229 | */␊ |
230 | void register_hook_callback(const char* name, void(*callback)(void*, void*, void*, void*))␊ |
231 | {␊ |
232 | ␉DBG("Registering %s\n", name);␊ |
233 | ␉// Locate Module hook␊ |
234 | ␉if(moduleCallbacks == NULL)␊ |
235 | ␉{␊ |
236 | ␉␉moduleCallbacks = malloc(sizeof(moduleHook_t));␊ |
237 | ␉␉moduleCallbacks->next = NULL;␊ |
238 | ␉␉moduleCallbacks->name = name;␊ |
239 | ␉␉// Initialize hook list␊ |
240 | ␉␉moduleCallbacks->callbacks = (callbackList_t*)malloc(sizeof(callbackList_t));␊ |
241 | ␉␉moduleCallbacks->callbacks->callback = callback;␊ |
242 | ␉␉moduleCallbacks->callbacks->next = NULL;␊ |
243 | ␉}␊ |
244 | ␉else␊ |
245 | ␉{␊ |
246 | ␉␉moduleHook_t* hooks = moduleCallbacks;␊ |
247 | ␉␉moduleHook_t* newHook = malloc(sizeof(moduleHook_t));;␊ |
248 | ␉␉␊ |
249 | ␉␉while(hooks->next != NULL && strcmp(name, hooks->name) < 0)␊ |
250 | ␉␉{␊ |
251 | ␉␉␉hooks = hooks->next;␊ |
252 | ␉␉}␊ |
253 | ␉␉␊ |
254 | ␉␉DBG("%s cmp %s = %d\n", name, hooks->name, strcmp(name, hooks->name));␊ |
255 | ␉␉␊ |
256 | ␉␉if(hooks == NULL)␊ |
257 | ␉␉{␊ |
258 | ␉␉␉newHook->next = moduleCallbacks;␊ |
259 | ␉␉␉moduleCallbacks = newHook;␊ |
260 | ␉␉␉newHook->name = name;␊ |
261 | ␉␉␉newHook->callbacks = (callbackList_t*)malloc(sizeof(callbackList_t));␊ |
262 | ␉␉␉newHook->callbacks->callback = callback;␊ |
263 | ␉␉␉newHook->callbacks->next = NULL;␊ |
264 | ␉␉␉␊ |
265 | ␉␉}␊ |
266 | ␉␉else if(strcmp(name, hooks->name) != 0)␊ |
267 | ␉␉{␊ |
268 | ␉␉␉newHook->next = hooks->next;␊ |
269 | ␉␉␉hooks->next = newHook;␊ |
270 | ␉␉␉␊ |
271 | ␉␉␉newHook->name = name;␊ |
272 | ␉␉␉newHook->callbacks = (callbackList_t*)malloc(sizeof(callbackList_t));␊ |
273 | ␉␉␉newHook->callbacks->callback = callback;␊ |
274 | ␉␉␉newHook->callbacks->next = NULL;␊ |
275 | ␉␉}␊ |
276 | ␉␉else␊ |
277 | ␉␉{␊ |
278 | ␉␉␉callbackList_t* callbacks = hooks->callbacks;␊ |
279 | ␉␉␉while(callbacks->next != NULL)␊ |
280 | ␉␉␉{␊ |
281 | ␉␉␉␉callbacks = callbacks->next;␊ |
282 | ␉␉␉}␊ |
283 | ␉␉␉// Add new entry to end of hook list.␊ |
284 | ␉␉␉callbacks->next = (callbackList_t*)malloc(sizeof(callbackList_t));␊ |
285 | ␉␉␉callbacks = callbacks->next;␊ |
286 | ␉␉␉callbacks->next = NULL;␊ |
287 | ␉␉␉callbacks->callback = callback;␊ |
288 | ␉␉␉␊ |
289 | ␉␉}␊ |
290 | ␉}␊ |
291 | #if DEBUG_MODULES␊ |
292 | ␉print_hook_list();␊ |
293 | ␉getc();␊ |
294 | #endif␊ |
295 | ␉␊ |
296 | }␊ |
297 | ␊ |
298 | ␊ |
299 | /*␊ |
300 | * Parse through a macho module. The module will be rebased and binded␊ |
301 | * as specified in the macho header. If the module is sucessfuly laoded␊ |
302 | * the module iinit address will be returned.␊ |
303 | * NOTE; all dependecies will be loaded before this module is started␊ |
304 | * NOTE: If the module is unable to load ot completeion, the modules␊ |
305 | * symbols will still be available (TODO: fix this). This should not␊ |
306 | * happen as all dependencies are verified before the sybols are read in.␊ |
307 | */␊ |
308 | void* parse_mach(void* binary, int(*dylib_loader)(char*), long long(*symbol_handler)(char*, long long, char))␉// TODO: add param to specify valid archs␊ |
309 | {␉␊ |
310 | ␉char is64 = false;␊ |
311 | ␉void (*module_start)(void) = NULL;␊ |
312 | ␉␊ |
313 | ␉// Module info␊ |
314 | ␉/*char* moduleName = NULL;␊ |
315 | ␉UInt32 moduleVersion = 0;␊ |
316 | ␉UInt32 moduleCompat = 0;␊ |
317 | ␉*/␊ |
318 | ␉// TODO convert all of the structs to a union␊ |
319 | ␉struct load_command *loadCommand = NULL;␊ |
320 | ␉struct dylib_command* dylibCommand = NULL;␊ |
321 | ␉struct dyld_info_command* dyldInfoCommand = NULL;␊ |
322 | ␉␊ |
323 | ␉struct symtab_command* symtabCommand = NULL;␊ |
324 | ␉struct segment_command *segCommand = NULL;␊ |
325 | ␉struct segment_command_64 *segCommand64 = NULL;␊ |
326 | ␊ |
327 | ␉//struct dysymtab_command* dysymtabCommand = NULL;␊ |
328 | ␉UInt32 binaryIndex = 0;␊ |
329 | ␉UInt16 cmd = 0;␊ |
330 | ␊ |
331 | ␉// Parse through the load commands␊ |
332 | ␉if(((struct mach_header*)binary)->magic == MH_MAGIC)␊ |
333 | ␉{␊ |
334 | ␉␉is64 = 0;␊ |
335 | ␉␉binaryIndex += sizeof(struct mach_header);␊ |
336 | ␉}␊ |
337 | ␉else if(((struct mach_header_64*)binary)->magic == MH_MAGIC_64)␊ |
338 | ␉{␊ |
339 | ␉␉// NOTE: modules cannot be 64bit...␊ |
340 | ␉␉is64 = 1;␊ |
341 | ␉␉binaryIndex += sizeof(struct mach_header_64);␊ |
342 | ␉}␊ |
343 | ␉else␊ |
344 | ␉{␊ |
345 | ␉␉printf("Invalid mach magic\n");␊ |
346 | ␉␉getc();␊ |
347 | ␉␉return NULL;␊ |
348 | ␉}␊ |
349 | ␊ |
350 | ␊ |
351 | ␉␊ |
352 | ␉/*if(((struct mach_header*)binary)->filetype != MH_DYLIB)␊ |
353 | ␉{␊ |
354 | ␉␉printf("Module is not a dylib. Unable to load.\n");␊ |
355 | ␉␉getc();␊ |
356 | ␉␉return NULL; // Module is in the incorrect format␊ |
357 | ␉}*/␊ |
358 | ␉␊ |
359 | ␉while(cmd < ((struct mach_header*)binary)->ncmds)␊ |
360 | ␉{␊ |
361 | ␉␉cmd++;␊ |
362 | ␉␉␊ |
363 | ␉␉loadCommand = binary + binaryIndex;␊ |
364 | ␉␉UInt32 cmdSize = loadCommand->cmdsize;␊ |
365 | ␊ |
366 | ␉␉␊ |
367 | ␉␉switch ((loadCommand->cmd & 0x7FFFFFFF))␊ |
368 | ␉␉{␊ |
369 | ␉␉␉case LC_SYMTAB:␊ |
370 | ␉␉␉␉symtabCommand = binary + binaryIndex;␊ |
371 | ␉␉␉␉break;␊ |
372 | ␉␉␉␉␊ |
373 | ␉␉␉case LC_SEGMENT: // 32bit macho␊ |
374 | ␉␉␉␉segCommand = binary + binaryIndex;␊ |
375 | ␉␉␉␉␊ |
376 | ␉␉␉␉//printf("Segment name is %s\n", segCommand->segname);␊ |
377 | ␉␉␉␉␊ |
378 | ␉␉␉␉if(strcmp("__TEXT", segCommand->segname) == 0)␊ |
379 | ␉␉␉␉{␊ |
380 | ␉␉␉␉␉UInt32 sectionIndex;␊ |
381 | ␉␉␉␉␉␊ |
382 | ␉␉␉␉␉sectionIndex = sizeof(struct segment_command);␊ |
383 | ␉␉␉␉␉␊ |
384 | ␉␉␉␉␉struct section *sect;␊ |
385 | ␉␉␉␉␉␊ |
386 | ␉␉␉␉␉while(sectionIndex < segCommand->cmdsize)␊ |
387 | ␉␉␉␉␉{␊ |
388 | ␉␉␉␉␉␉sect = binary + binaryIndex + sectionIndex;␊ |
389 | ␉␉␉␉␉␉␊ |
390 | ␉␉␉␉␉␉sectionIndex += sizeof(struct section);␊ |
391 | ␉␉␉␉␉␉␊ |
392 | ␉␉␉␉␉␉␊ |
393 | ␉␉␉␉␉␉if(strcmp("__text", sect->sectname) == 0)␊ |
394 | ␉␉␉␉␉␉{␊ |
395 | ␉␉␉␉␉␉␉// __TEXT,__text found, save the offset and address for when looking for the calls.␊ |
396 | ␉␉␉␉␉␉␉textSection = sect->offset;␊ |
397 | ␉␉␉␉␉␉␉textAddress = sect->addr;␊ |
398 | ␉␉␉␉␉␉␉break;␊ |
399 | ␉␉␉␉␉␉}␉␉␉␉␉␊ |
400 | ␉␉␉␉␉}␊ |
401 | ␉␉␉␉}␊ |
402 | ␉␉␉␉break;␊ |
403 | ␉␉␉case LC_SEGMENT_64:␉// 64bit macho's␊ |
404 | ␉␉␉␉segCommand64 = binary + binaryIndex;␊ |
405 | ␉␉␉␉␊ |
406 | ␉␉␉␉//printf("Segment name is %s\n", segCommand->segname);␊ |
407 | ␉␉␉␉␊ |
408 | ␉␉␉␉if(strcmp("__TEXT", segCommand64->segname) == 0)␊ |
409 | ␉␉␉␉{␊ |
410 | ␉␉␉␉␉UInt32 sectionIndex;␊ |
411 | ␉␉␉␉␉␊ |
412 | ␉␉␉␉␉sectionIndex = sizeof(struct segment_command_64);␊ |
413 | ␉␉␉␉␉␊ |
414 | ␉␉␉␉␉struct section_64 *sect;␊ |
415 | ␉␉␉␉␉␊ |
416 | ␉␉␉␉␉while(sectionIndex < segCommand64->cmdsize)␊ |
417 | ␉␉␉␉␉{␊ |
418 | ␉␉␉␉␉␉sect = binary + binaryIndex + sectionIndex;␊ |
419 | ␉␉␉␉␉␉␊ |
420 | ␉␉␉␉␉␉sectionIndex += sizeof(struct section_64);␊ |
421 | ␉␉␉␉␉␉␊ |
422 | ␉␉␉␉␉␉␊ |
423 | ␉␉␉␉␉␉if(strcmp("__text", sect->sectname) == 0)␊ |
424 | ␉␉␉␉␉␉{␊ |
425 | ␉␉␉␉␉␉␉// __TEXT,__text found, save the offset and address for when looking for the calls.␊ |
426 | ␉␉␉␉␉␉␉textSection = sect->offset;␊ |
427 | ␉␉␉␉␉␉␉textAddress = sect->addr;␊ |
428 | ␉␉␉␉␉␉␉␊ |
429 | ␉␉␉␉␉␉␉break;␊ |
430 | ␉␉␉␉␉␉}␉␉␉␉␉␊ |
431 | ␉␉␉␉␉}␊ |
432 | ␉␉␉␉}␊ |
433 | ␉␉␉␉␊ |
434 | ␉␉␉␉break;␊ |
435 | ␉␉␉␉␊ |
436 | ␉␉␉case LC_DYSYMTAB:␊ |
437 | ␉␉␉␉break;␊ |
438 | ␉␉␉␉␊ |
439 | ␉␉␉case LC_LOAD_DYLIB:␊ |
440 | ␉␉␉case LC_LOAD_WEAK_DYLIB ^ LC_REQ_DYLD:␊ |
441 | ␉␉␉␉dylibCommand = binary + binaryIndex;␊ |
442 | ␉␉␉␉char* module = binary + binaryIndex + ((UInt32)*((UInt32*)&dylibCommand->dylib.name));␊ |
443 | ␉␉␉␉// TODO: verify version␊ |
444 | ␉␉␉␉// =␉dylibCommand->dylib.current_version;␊ |
445 | ␉␉␉␉// =␉dylibCommand->dylib.compatibility_version;␊ |
446 | ␉␉␉␉char* name = malloc(strlen(module) + strlen(".dylib") + 1);␊ |
447 | ␉␉␉␉sprintf(name, "%s.dylib", module);␊ |
448 | ␉␉␉␉if(dylib_loader && !dylib_loader(name))␊ |
449 | ␉␉␉␉{␊ |
450 | ␉␉␉␉␉// Unable to load dependancy␊ |
451 | ␉␉␉␉␉//return NULL;␊ |
452 | ␉␉␉␉}␊ |
453 | ␉␉␉␉break;␊ |
454 | ␉␉␉␉␊ |
455 | ␉␉␉case LC_ID_DYLIB:␊ |
456 | ␉␉␉␉dylibCommand = binary + binaryIndex;␊ |
457 | ␉␉␉␉/*moduleName =␉binary + binaryIndex + ((UInt32)*((UInt32*)&dylibCommand->dylib.name));␊ |
458 | ␉␉␉␉moduleVersion =␉dylibCommand->dylib.current_version;␊ |
459 | ␉␉␉␉moduleCompat =␉dylibCommand->dylib.compatibility_version;␊ |
460 | ␉␉␉␉ */␊ |
461 | ␉␉␉␉break;␊ |
462 | ␊ |
463 | ␉␉␉case LC_DYLD_INFO:␊ |
464 | ␉␉␉␉// Bind and rebase info is stored here␊ |
465 | ␉␉␉␉dyldInfoCommand = binary + binaryIndex;␊ |
466 | ␉␉␉␉break;␊ |
467 | ␉␉␉␉␊ |
468 | ␉␉␉case LC_UUID:␊ |
469 | ␉␉␉␉break;␊ |
470 | ␉␉␉␉␊ |
471 | ␉␉␉case LC_UNIXTHREAD:␊ |
472 | ␉␉␉␉break;␊ |
473 | ␉␉␉␉␊ |
474 | ␉␉␉default:␊ |
475 | ␉␉␉␉DBG("Unhandled loadcommand 0x%X\n", loadCommand->cmd & 0x7FFFFFFF);␊ |
476 | ␉␉␉␉break;␊ |
477 | ␉␉␊ |
478 | ␉␉}␊ |
479 | ␊ |
480 | ␉␉binaryIndex += cmdSize;␊ |
481 | ␉}␊ |
482 | ␉//if(!moduleName) return NULL;␊ |
483 | ␉␉␊ |
484 | ␊ |
485 | ␉// bind_macho uses the symbols.␊ |
486 | ␉module_start = (void*)handle_symtable((UInt32)binary, symtabCommand, symbol_handler, is64);␊ |
487 | ␊ |
488 | ␉// Rebase the module before binding it.␊ |
489 | ␉if(dyldInfoCommand && dyldInfoCommand->rebase_off)␊ |
490 | ␉{␊ |
491 | ␉␉rebase_macho(binary, (char*)dyldInfoCommand->rebase_off, dyldInfoCommand->rebase_size);␊ |
492 | ␉}␊ |
493 | ␉␊ |
494 | ␉if(dyldInfoCommand && dyldInfoCommand->bind_off)␊ |
495 | ␉{␊ |
496 | ␉␉bind_macho(binary, (char*)dyldInfoCommand->bind_off, dyldInfoCommand->bind_size);␊ |
497 | ␉}␊ |
498 | ␉␊ |
499 | ␉if(dyldInfoCommand && dyldInfoCommand->weak_bind_off)␊ |
500 | ␉{␊ |
501 | ␉␉// NOTE: this currently should never happen.␊ |
502 | ␉␉bind_macho(binary, (char*)dyldInfoCommand->weak_bind_off, dyldInfoCommand->weak_bind_size);␊ |
503 | ␉}␊ |
504 | ␉␊ |
505 | ␉if(dyldInfoCommand && dyldInfoCommand->lazy_bind_off)␊ |
506 | ␉{␊ |
507 | ␉␉// NOTE: we are binding the lazy pointers as a module is laoded,␊ |
508 | ␉␉// This should be changed to bind when a symbol is referened at runtime instead.␊ |
509 | ␉␉bind_macho(binary, (char*)dyldInfoCommand->lazy_bind_off, dyldInfoCommand->lazy_bind_size);␊ |
510 | ␉}␊ |
511 | ␊ |
512 | ␉return module_start;␊ |
513 | ␉␊ |
514 | }␊ |
515 | ␊ |
516 | ␊ |
517 | // Based on code from dylibinfo.cpp and ImageLoaderMachOCompressed.cpp␊ |
518 | void rebase_macho(void* base, char* rebase_stream, UInt32 size)␊ |
519 | {␊ |
520 | ␉rebase_stream += (UInt32)base;␊ |
521 | ␉␊ |
522 | ␉UInt8 immediate = 0;␊ |
523 | ␉UInt8 opcode = 0;␊ |
524 | ␉UInt8 type = 0;␊ |
525 | ␉␊ |
526 | ␉UInt32 segmentAddress = 0;␊ |
527 | ␉␊ |
528 | ␉␊ |
529 | ␉␊ |
530 | ␉UInt32 tmp = 0;␊ |
531 | ␉UInt32 tmp2 = 0;␊ |
532 | ␉UInt8 bits = 0;␊ |
533 | ␉int index = 0;␊ |
534 | ␉␊ |
535 | ␉int done = 0;␊ |
536 | ␉unsigned int i = 0;␊ |
537 | ␉␊ |
538 | ␉while(/*!done &&*/ i < size)␊ |
539 | ␉{␊ |
540 | ␉␉immediate = rebase_stream[i] & REBASE_IMMEDIATE_MASK;␊ |
541 | ␉␉opcode = rebase_stream[i] & REBASE_OPCODE_MASK;␊ |
542 | ␊ |
543 | ␉␉␊ |
544 | ␉␉switch(opcode)␊ |
545 | ␉␉{␊ |
546 | ␉␉␉case REBASE_OPCODE_DONE:␊ |
547 | ␉␉␉␉// Rebase complete.␊ |
548 | ␉␉␉␉done = 1;␊ |
549 | ␉␉␉␉break;␊ |
550 | ␉␉␉␉␊ |
551 | ␉␉␉␉␊ |
552 | ␉␉␉case REBASE_OPCODE_SET_TYPE_IMM:␊ |
553 | ␉␉␉␉// Set rebase type (pointer, absolute32, pcrel32)␊ |
554 | ␉␉␉␉//DBG("Rebase type = 0x%X\n", immediate);␊ |
555 | ␉␉␉␉type = immediate;␊ |
556 | ␉␉␉␉break;␊ |
557 | ␉␉␉␉␊ |
558 | ␉␉␉␉␊ |
559 | ␉␉␉case REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:␊ |
560 | ␉␉␉␉// Locate address to begin rebasing␊ |
561 | ␉␉␉␉segmentAddress = 0;␊ |
562 | ␊ |
563 | ␉␉␉␉struct segment_command* segCommand = NULL; // NOTE: 32bit only␊ |
564 | ␉␉␉␉␊ |
565 | ␉␉␉␉unsigned int binIndex = 0;␊ |
566 | ␉␉␉␉index = 0;␊ |
567 | ␉␉␉␉do␊ |
568 | ␉␉␉␉{␊ |
569 | ␉␉␉␉␉segCommand = base + sizeof(struct mach_header) + binIndex;␊ |
570 | ␉␉␉␉␉␊ |
571 | ␉␉␉␉␉␊ |
572 | ␉␉␉␉␉binIndex += segCommand->cmdsize;␊ |
573 | ␉␉␉␉␉index++;␊ |
574 | ␉␉␉␉}␊ |
575 | ␉␉␉␉while(index <= immediate);␊ |
576 | ␊ |
577 | ␊ |
578 | ␉␉␉␉segmentAddress = segCommand->fileoff;␊ |
579 | ␉␉␉␉␊ |
580 | ␉␉␉␉tmp = 0;␊ |
581 | ␉␉␉␉bits = 0;␊ |
582 | ␉␉␉␉do␊ |
583 | ␉␉␉␉{␊ |
584 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
585 | ␉␉␉␉␉bits += 7;␊ |
586 | ␉␉␉␉}␊ |
587 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
588 | ␉␉␉␉␊ |
589 | ␉␉␉␉segmentAddress += tmp;␊ |
590 | ␉␉␉␉break;␊ |
591 | ␉␉␉␉␊ |
592 | ␉␉␉␉␊ |
593 | ␉␉␉case REBASE_OPCODE_ADD_ADDR_ULEB:␊ |
594 | ␉␉␉␉// Add value to rebase address␊ |
595 | ␉␉␉␉tmp = 0;␊ |
596 | ␉␉␉␉bits = 0;␊ |
597 | ␉␉␉␉do␊ |
598 | ␉␉␉␉{␊ |
599 | ␉␉␉␉␉tmp <<= bits;␊ |
600 | ␉␉␉␉␉tmp |= rebase_stream[++i] & 0x7f;␊ |
601 | ␉␉␉␉␉bits += 7;␊ |
602 | ␉␉␉␉}␊ |
603 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
604 | ␉␉␉␉␊ |
605 | ␉␉␉␉segmentAddress +=␉tmp; ␊ |
606 | ␉␉␉␉break;␊ |
607 | ␉␉␉␉␊ |
608 | ␉␉␉case REBASE_OPCODE_ADD_ADDR_IMM_SCALED:␊ |
609 | ␉␉␉␉segmentAddress += immediate * sizeof(void*);␊ |
610 | ␉␉␉␉break;␊ |
611 | ␉␉␉␉␊ |
612 | ␉␉␉␉␊ |
613 | ␉␉␉case REBASE_OPCODE_DO_REBASE_IMM_TIMES:␊ |
614 | ␉␉␉␉index = 0;␊ |
615 | ␉␉␉␉for (index = 0; index < immediate; ++index) {␊ |
616 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␊ |
617 | ␉␉␉␉␉segmentAddress += sizeof(void*);␊ |
618 | ␉␉␉␉}␊ |
619 | ␉␉␉␉break;␊ |
620 | ␉␉␉␊ |
621 | ␉␉␉␉␊ |
622 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ULEB_TIMES:␊ |
623 | ␉␉␉␉tmp = 0;␊ |
624 | ␉␉␉␉bits = 0;␊ |
625 | ␉␉␉␉do␊ |
626 | ␉␉␉␉{␊ |
627 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
628 | ␉␉␉␉␉bits += 7;␊ |
629 | ␉␉␉␉}␊ |
630 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
631 | ␉␉␉␉␊ |
632 | ␉␉␉␉index = 0;␊ |
633 | ␉␉␉␉for (index = 0; index < tmp; ++index) {␊ |
634 | ␉␉␉␉␉//DBG("\tRebasing 0x%X\n", segmentAddress);␊ |
635 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␉␉␉␉␉␊ |
636 | ␉␉␉␉␉segmentAddress += sizeof(void*);␊ |
637 | ␉␉␉␉}␊ |
638 | ␉␉␉␉break;␊ |
639 | ␉␉␉␉␊ |
640 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB:␊ |
641 | ␉␉␉␉tmp = 0;␊ |
642 | ␉␉␉␉bits = 0;␊ |
643 | ␉␉␉␉do␊ |
644 | ␉␉␉␉{␊ |
645 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
646 | ␉␉␉␉␉bits += 7;␊ |
647 | ␉␉␉␉}␊ |
648 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
649 | ␉␉␉␉␊ |
650 | ␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␊ |
651 | ␉␉␉␉␊ |
652 | ␉␉␉␉segmentAddress += tmp + sizeof(void*);␊ |
653 | ␉␉␉␉break;␊ |
654 | ␉␉␉␉␊ |
655 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB:␊ |
656 | ␉␉␉␉tmp = 0;␊ |
657 | ␉␉␉␉bits = 0;␊ |
658 | ␉␉␉␉do␊ |
659 | ␉␉␉␉{␊ |
660 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
661 | ␉␉␉␉␉bits += 7;␊ |
662 | ␉␉␉␉}␊ |
663 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
664 | ␉␉␉␉␊ |
665 | ␉␉␉␉␊ |
666 | ␉␉␉␉tmp2 = 0;␊ |
667 | ␉␉␉␉bits = 0;␊ |
668 | ␉␉␉␉do␊ |
669 | ␉␉␉␉{␊ |
670 | ␉␉␉␉␉tmp2 |= (rebase_stream[++i] & 0x7f) << bits;␊ |
671 | ␉␉␉␉␉bits += 7;␊ |
672 | ␉␉␉␉}␊ |
673 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
674 | ␉␉␉␉␊ |
675 | ␉␉␉␉index = 0;␊ |
676 | ␉␉␉␉for (index = 0; index < tmp; ++index) {␊ |
677 | ␊ |
678 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␊ |
679 | ␉␉␉␉␉␊ |
680 | ␉␉␉␉␉segmentAddress += tmp2 + sizeof(void*);␊ |
681 | ␉␉␉␉}␊ |
682 | ␉␉␉␉break;␊ |
683 | ␉␉}␊ |
684 | ␉␉i++;␊ |
685 | ␉}␊ |
686 | }␊ |
687 | ␊ |
688 | // Based on code from dylibinfo.cpp and ImageLoaderMachOCompressed.cpp␊ |
689 | // NOTE: this uses 32bit values, and not 64bit values. ␊ |
690 | // There is apossibility that this could cause issues,␊ |
691 | // however the macho file is 32 bit, so it shouldn't matter too much␊ |
692 | void bind_macho(void* base, char* bind_stream, UInt32 size)␊ |
693 | {␉␊ |
694 | ␉bind_stream += (UInt32)base;␊ |
695 | ␉␊ |
696 | ␉UInt8 immediate = 0;␊ |
697 | ␉UInt8 opcode = 0;␊ |
698 | ␉UInt8 type = 0;␊ |
699 | ␉␊ |
700 | ␉UInt32 segmentAddress = 0;␊ |
701 | ␉␊ |
702 | ␉UInt32 address = 0;␊ |
703 | ␉␊ |
704 | ␉SInt32 addend = 0;␉␉␉// TODO: handle this␊ |
705 | ␉SInt32 libraryOrdinal = 0;␊ |
706 | ␊ |
707 | ␉const char* symbolName = NULL;␊ |
708 | ␉UInt8 symboFlags = 0;␊ |
709 | ␉UInt32 symbolAddr = 0xFFFFFFFF;␊ |
710 | ␉␊ |
711 | ␉// Temperary variables␊ |
712 | ␉UInt8 bits = 0;␊ |
713 | ␉UInt32 tmp = 0;␊ |
714 | ␉UInt32 tmp2 = 0;␊ |
715 | ␉␊ |
716 | ␉UInt32 index = 0;␊ |
717 | ␉int done = 0;␊ |
718 | ␉unsigned int i = 0;␊ |
719 | ␉␊ |
720 | ␉while(/*!done &&*/ i < size)␊ |
721 | ␉{␊ |
722 | ␉␉immediate = bind_stream[i] & BIND_IMMEDIATE_MASK;␊ |
723 | ␉␉opcode = bind_stream[i] & BIND_OPCODE_MASK;␊ |
724 | ␉␉␊ |
725 | ␉␉␊ |
726 | ␉␉switch(opcode)␊ |
727 | ␉␉{␊ |
728 | ␉␉␉case BIND_OPCODE_DONE:␊ |
729 | ␉␉␉␉done = 1; ␊ |
730 | ␉␉␉␉break;␊ |
731 | ␉␉␉␉␊ |
732 | ␉␉␉case BIND_OPCODE_SET_DYLIB_ORDINAL_IMM:␊ |
733 | ␉␉␉␉libraryOrdinal = immediate;␊ |
734 | ␉␉␉␉//DBG("BIND_OPCODE_SET_DYLIB_ORDINAL_IMM: %d\n", libraryOrdinal);␊ |
735 | ␉␉␉␉break;␊ |
736 | ␉␉␉␉␊ |
737 | ␉␉␉case BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB:␊ |
738 | ␉␉␉␉libraryOrdinal = 0;␊ |
739 | ␉␉␉␉bits = 0;␊ |
740 | ␉␉␉␉do␊ |
741 | ␉␉␉␉{␊ |
742 | ␉␉␉␉␉libraryOrdinal |= (bind_stream[++i] & 0x7f) << bits;␊ |
743 | ␉␉␉␉␉bits += 7;␊ |
744 | ␉␉␉␉}␊ |
745 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
746 | ␉␉␉␉␊ |
747 | ␉␉␉␉//DBG("BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB: %d\n", libraryOrdinal);␊ |
748 | ␊ |
749 | ␉␉␉␉break;␊ |
750 | ␉␉␉␉␊ |
751 | ␉␉␉case BIND_OPCODE_SET_DYLIB_SPECIAL_IMM:␊ |
752 | ␉␉␉␉// NOTE: this is wrong, fortunately we don't use it␊ |
753 | ␉␉␉␉libraryOrdinal = -immediate;␊ |
754 | ␉␉␉␉//DBG("BIND_OPCODE_SET_DYLIB_SPECIAL_IMM: %d\n", libraryOrdinal);␊ |
755 | ␊ |
756 | ␉␉␉␉break;␊ |
757 | ␉␉␉␉␊ |
758 | ␉␉␉case BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:␊ |
759 | ␉␉␉␉symboFlags = immediate;␊ |
760 | ␉␉␉␉symbolName = (char*)&bind_stream[++i];␊ |
761 | ␉␉␉␉i += strlen((char*)&bind_stream[i]);␊ |
762 | ␉␉␉␉//DBG("BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM: %s, 0x%X\n", symbolName, symboFlags);␊ |
763 | ␊ |
764 | ␉␉␉␉symbolAddr = lookup_all_symbols(symbolName);␊ |
765 | ␊ |
766 | ␉␉␉␉break;␊ |
767 | ␉␉␉␉␊ |
768 | ␉␉␉case BIND_OPCODE_SET_TYPE_IMM:␊ |
769 | ␉␉␉␉// Set bind type (pointer, absolute32, pcrel32)␊ |
770 | ␉␉␉␉type = immediate;␊ |
771 | ␉␉␉␉//DBG("BIND_OPCODE_SET_TYPE_IMM: %d\n", type);␊ |
772 | ␊ |
773 | ␉␉␉␉break;␊ |
774 | ␉␉␉␉␊ |
775 | ␉␉␉case BIND_OPCODE_SET_ADDEND_SLEB:␊ |
776 | ␉␉␉␉addend = 0;␊ |
777 | ␉␉␉␉bits = 0;␊ |
778 | ␉␉␉␉do␊ |
779 | ␉␉␉␉{␊ |
780 | ␉␉␉␉␉addend |= (bind_stream[++i] & 0x7f) << bits;␊ |
781 | ␉␉␉␉␉bits += 7;␊ |
782 | ␉␉␉␉}␊ |
783 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
784 | ␉␉␉␉␊ |
785 | ␉␉␉␉if(!(bind_stream[i-1] & 0x40)) addend *= -1;␊ |
786 | ␉␉␉␉␊ |
787 | ␉␉␉␉//DBG("BIND_OPCODE_SET_ADDEND_SLEB: %d\n", addend);␊ |
788 | ␉␉␉␉break;␊ |
789 | ␉␉␉␉␊ |
790 | ␉␉␉case BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:␊ |
791 | ␉␉␉␉segmentAddress = 0;␊ |
792 | ␊ |
793 | ␉␉␉␉// Locate address␊ |
794 | ␉␉␉␉struct segment_command* segCommand = NULL;␉// NOTE: 32bit only␊ |
795 | ␉␉␉␉␊ |
796 | ␉␉␉␉unsigned int binIndex = 0;␊ |
797 | ␉␉␉␉index = 0;␊ |
798 | ␉␉␉␉do␊ |
799 | ␉␉␉␉{␊ |
800 | ␉␉␉␉␉segCommand = base + sizeof(struct mach_header) + binIndex;␊ |
801 | ␉␉␉␉␉binIndex += segCommand->cmdsize;␊ |
802 | ␉␉␉␉␉index++;␊ |
803 | ␉␉␉␉}␊ |
804 | ␉␉␉␉while(index <= immediate);␊ |
805 | ␉␉␉␉␊ |
806 | ␉␉␉␉segmentAddress = segCommand->fileoff;␊ |
807 | ␉␉␉␉␊ |
808 | ␉␉␉␉// Read in offset␊ |
809 | ␉␉␉␉tmp = 0;␊ |
810 | ␉␉␉␉bits = 0;␊ |
811 | ␉␉␉␉do␊ |
812 | ␉␉␉␉{␊ |
813 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
814 | ␉␉␉␉␉bits += 7;␊ |
815 | ␉␉␉␉}␊ |
816 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
817 | ␉␉␉␉␊ |
818 | ␉␉␉␉segmentAddress += tmp;␊ |
819 | ␉␉␉␉␊ |
820 | ␉␉␉␉//DBG("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: 0x%X\n", segmentAddress);␊ |
821 | ␉␉␉␉break;␊ |
822 | ␉␉␉␉␊ |
823 | ␉␉␉case BIND_OPCODE_ADD_ADDR_ULEB:␊ |
824 | ␉␉␉␉// Read in offset␊ |
825 | ␉␉␉␉tmp = 0;␊ |
826 | ␉␉␉␉bits = 0;␊ |
827 | ␉␉␉␉do␊ |
828 | ␉␉␉␉{␊ |
829 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
830 | ␉␉␉␉␉bits += 7;␊ |
831 | ␉␉␉␉}␊ |
832 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
833 | ␉␉␉␉␊ |
834 | ␉␉␉␉segmentAddress += tmp;␊ |
835 | ␉␉␉␉//DBG("BIND_OPCODE_ADD_ADDR_ULEB: 0x%X\n", segmentAddress);␊ |
836 | ␉␉␉␉break;␊ |
837 | ␉␉␉␉␊ |
838 | ␉␉␉case BIND_OPCODE_DO_BIND:␊ |
839 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND\n");␊ |
840 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
841 | ␉␉␉␉{␊ |
842 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
843 | ␊ |
844 | ␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, BIND_TYPE_POINTER);␊ |
845 | ␉␉␉␉}␊ |
846 | ␉␉␉␉else if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
847 | ␉␉␉␉{␊ |
848 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
849 | ␉␉␉␉}␊ |
850 | ␉␉␉␉␊ |
851 | ␉␉␉␉segmentAddress += sizeof(void*);␊ |
852 | ␉␉␉␉break;␊ |
853 | ␉␉␉␉␊ |
854 | ␉␉␉case BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:␊ |
855 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB\n");␊ |
856 | ␉␉␉␉␊ |
857 | ␉␉␉␉␊ |
858 | ␉␉␉␉// Read in offset␊ |
859 | ␉␉␉␉tmp = 0;␊ |
860 | ␉␉␉␉bits = 0;␊ |
861 | ␉␉␉␉do␊ |
862 | ␉␉␉␉{␊ |
863 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
864 | ␉␉␉␉␉bits += 7;␊ |
865 | ␉␉␉␉}␊ |
866 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
867 | ␉␉␉␉␊ |
868 | ␉␉␉␉␊ |
869 | ␉␉␉␉␊ |
870 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
871 | ␉␉␉␉{␊ |
872 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
873 | ␊ |
874 | ␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, BIND_TYPE_POINTER);␊ |
875 | ␉␉␉␉}␊ |
876 | ␉␉␉␉else if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
877 | ␉␉␉␉{␊ |
878 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
879 | ␉␉␉␉}␊ |
880 | ␉␉␉␉segmentAddress += tmp + sizeof(void*);␊ |
881 | ␊ |
882 | ␉␉␉␉␊ |
883 | ␉␉␉␉break;␊ |
884 | ␉␉␉␉␊ |
885 | ␉␉␉case BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED:␊ |
886 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED\n");␊ |
887 | ␉␉␉␉␊ |
888 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
889 | ␉␉␉␉{␊ |
890 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
891 | ␊ |
892 | ␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, BIND_TYPE_POINTER);␊ |
893 | ␉␉␉␉}␊ |
894 | ␉␉␉␉else if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
895 | ␉␉␉␉{␊ |
896 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
897 | ␉␉␉␉}␊ |
898 | ␉␉␉␉segmentAddress += (immediate * sizeof(void*)) + sizeof(void*);␊ |
899 | ␊ |
900 | ␉␉␉␉␊ |
901 | ␉␉␉␉break;␊ |
902 | ␉␉␉␉␊ |
903 | ␉␉␉case BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:␊ |
904 | ␊ |
905 | ␉␉␉␉tmp = 0;␊ |
906 | ␉␉␉␉bits = 0;␊ |
907 | ␉␉␉␉do␊ |
908 | ␉␉␉␉{␊ |
909 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
910 | ␉␉␉␉␉bits += 7;␊ |
911 | ␉␉␉␉}␊ |
912 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
913 | ␊ |
914 | ␉␉␉␉␊ |
915 | ␉␉␉␉tmp2 = 0;␊ |
916 | ␉␉␉␉bits = 0;␊ |
917 | ␉␉␉␉do␊ |
918 | ␉␉␉␉{␊ |
919 | ␉␉␉␉␉tmp2 |= (bind_stream[++i] & 0x7f) << bits;␊ |
920 | ␉␉␉␉␉bits += 7;␊ |
921 | ␉␉␉␉}␊ |
922 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
923 | ␉␉␉␉␊ |
924 | ␉␉␉␉␊ |
925 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB 0x%X 0x%X\n", tmp, tmp2);␊ |
926 | ␊ |
927 | ␉␉␉␉␊ |
928 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
929 | ␉␉␉␉{␊ |
930 | ␉␉␉␉␉for(index = 0; index < tmp; index++)␊ |
931 | ␉␉␉␉␉{␊ |
932 | ␉␉␉␉␉␉␊ |
933 | ␉␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
934 | ␊ |
935 | ␉␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, BIND_TYPE_POINTER);␊ |
936 | ␉␉␉␉␉␉␊ |
937 | ␉␉␉␉␉␉segmentAddress += tmp2 + sizeof(void*);␊ |
938 | ␉␉␉␉␉}␊ |
939 | ␉␉␉␉}␊ |
940 | ␉␉␉␉else if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
941 | ␉␉␉␉{␊ |
942 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
943 | ␉␉␉␉}␊ |
944 | ␉␉␉␉␊ |
945 | ␉␉␉␉␊ |
946 | ␉␉␉␉break;␊ |
947 | ␉␉␉␉␊ |
948 | ␉␉}␊ |
949 | ␉␉i++;␊ |
950 | ␉}␊ |
951 | }␊ |
952 | ␊ |
953 | inline void rebase_location(UInt32* location, char* base, int type)␊ |
954 | {␉␊ |
955 | ␉switch(type)␊ |
956 | ␉{␊ |
957 | ␉␉case REBASE_TYPE_POINTER:␊ |
958 | ␉␉case REBASE_TYPE_TEXT_ABSOLUTE32:␊ |
959 | ␉␉␉*location += (UInt32)base;␊ |
960 | ␉␉␉break;␊ |
961 | ␉␉␉␊ |
962 | ␉␉default:␊ |
963 | ␉␉␉break;␊ |
964 | ␉}␊ |
965 | }␊ |
966 | ␊ |
967 | inline void bind_location(UInt32* location, char* value, UInt32 addend, int type)␊ |
968 | {␉␊ |
969 | ␉// do actual update␊ |
970 | ␉char* newValue = value + addend;␊ |
971 | ␊ |
972 | ␉switch (type) {␊ |
973 | ␉␉case BIND_TYPE_POINTER:␊ |
974 | ␉␉case BIND_TYPE_TEXT_ABSOLUTE32:␊ |
975 | ␉␉␉break;␊ |
976 | ␊ |
977 | ␉␉case BIND_TYPE_TEXT_PCREL32:␊ |
978 | ␉␉␉newValue -= ((UInt32)location + 4);␊ |
979 | ␊ |
980 | ␉␉␉break;␊ |
981 | ␉␉default:␊ |
982 | ␉␉␉return;␊ |
983 | ␉}␊ |
984 | ␉*location = (UInt32)newValue;␊ |
985 | ␉␊ |
986 | ␊ |
987 | }␊ |
988 | ␊ |
989 | ␊ |
990 | /*␊ |
991 | * add_symbol␊ |
992 | * This function adds a symbol from a module to the list of known symbols ␊ |
993 | * possibly change to a pointer and add this to the Symbol module so that it can␊ |
994 | * adjust it's internal symbol list (sort) to optimize locating new symbols␊ |
995 | * NOTE: returns the address if the symbol is "start", else returns 0xFFFFFFFF␊ |
996 | */␊ |
997 | long long add_symbol(char* symbol, long long addr, char is64)␊ |
998 | {␊ |
999 | ␉if(is64) return 0xFFFFFFFF; // Fixme␊ |
1000 | ␊ |
1001 | ␉// This only can handle 32bit symbols ␊ |
1002 | ␉symbolList_t* entry;␊ |
1003 | ␉//DBG("Adding symbol %s at 0x%X\n", symbol, addr);␊ |
1004 | ␉␊ |
1005 | ␉if(!moduleSymbols)␊ |
1006 | ␉{␊ |
1007 | ␉␉moduleSymbols = entry = malloc(sizeof(symbolList_t));␊ |
1008 | ␊ |
1009 | ␉}␊ |
1010 | ␉else␊ |
1011 | ␉{␊ |
1012 | ␉␉entry = moduleSymbols;␊ |
1013 | ␉␉while(entry->next)␊ |
1014 | ␉␉{␊ |
1015 | ␉␉␉entry = entry->next;␊ |
1016 | ␉␉}␊ |
1017 | ␉␉␊ |
1018 | ␉␉entry->next = malloc(sizeof(symbolList_t));␊ |
1019 | ␉␉entry = entry->next;␊ |
1020 | ␉}␊ |
1021 | ␊ |
1022 | ␉entry->next = NULL;␊ |
1023 | ␉entry->addr = (UInt32)addr;␊ |
1024 | ␉entry->symbol = symbol;␊ |
1025 | ␉␊ |
1026 | ␉if(strcmp(symbol, "start") == 0)␊ |
1027 | ␉{␊ |
1028 | ␉␉return addr;␊ |
1029 | ␉}␊ |
1030 | ␉else␊ |
1031 | ␉{␊ |
1032 | ␉␉return 0xFFFFFFFF; // fixme␊ |
1033 | ␉}␊ |
1034 | }␊ |
1035 | ␊ |
1036 | ␊ |
1037 | /*␊ |
1038 | * print out the information about the loaded module␊ |
1039 | ␊ |
1040 | */␊ |
1041 | void module_loaded(const char* name/*, UInt32 version, UInt32 compat*/)␊ |
1042 | {␊ |
1043 | ␉moduleList_t* entry;␊ |
1044 | ␊ |
1045 | ␉if(loadedModules == NULL)␊ |
1046 | ␉{␊ |
1047 | ␉␉loadedModules = entry = malloc(sizeof(moduleList_t));␊ |
1048 | ␉}␊ |
1049 | ␉else␊ |
1050 | ␉{␊ |
1051 | ␉␉entry = loadedModules;␊ |
1052 | ␉␉while(entry->next)␊ |
1053 | ␉␉{␊ |
1054 | ␉␉␉entry = entry->next;␊ |
1055 | ␉␉}␊ |
1056 | ␉␉entry->next = malloc(sizeof(moduleList_t));␊ |
1057 | ␉␉entry = entry->next;␊ |
1058 | ␉}␊ |
1059 | ␉␊ |
1060 | ␉entry->next = NULL;␊ |
1061 | ␉entry->module = (char*)name;␊ |
1062 | ␉entry->version = 0; //version;␊ |
1063 | ␉entry->compat = 0; //compat;␊ |
1064 | ␉␊ |
1065 | ␉␊ |
1066 | }␊ |
1067 | ␊ |
1068 | int is_module_loaded(const char* name)␊ |
1069 | {␊ |
1070 | ␉moduleList_t* entry = loadedModules;␊ |
1071 | ␉while(entry)␊ |
1072 | ␉{␊ |
1073 | ␉␉DBG("Comparing %s with %s\n", name, entry->module);␊ |
1074 | ␉␉if(strcmp(entry->module, name) == 0)␊ |
1075 | ␉␉{␊ |
1076 | ␉␉␉DBG("Located module %s\n", name);␊ |
1077 | ␉␉␉return 1;␊ |
1078 | ␉␉}␊ |
1079 | ␉␉else␊ |
1080 | ␉␉{␊ |
1081 | ␉␉␉entry = entry->next;␊ |
1082 | ␉␉}␊ |
1083 | ␊ |
1084 | ␉}␊ |
1085 | ␉DBG("Module %s not found\n", name);␊ |
1086 | ␊ |
1087 | ␉return 0;␊ |
1088 | }␊ |
1089 | ␊ |
1090 | // Look for symbols using the Smbols moduel function.␊ |
1091 | // If non are found, look through the list of module symbols␊ |
1092 | unsigned int lookup_all_symbols(const char* name)␊ |
1093 | {␊ |
1094 | ␉unsigned int addr = 0xFFFFFFFF;␊ |
1095 | ␉if(lookup_symbol && (UInt32)lookup_symbol != 0xFFFFFFFF)␊ |
1096 | ␉{␊ |
1097 | ␉␉addr = lookup_symbol(name);␊ |
1098 | ␉␉if(addr != 0xFFFFFFFF)␊ |
1099 | ␉␉{␊ |
1100 | ␉␉␉//DBG("Internal symbol %s located at 0x%X\n", name, addr);␊ |
1101 | ␉␉␉return addr;␊ |
1102 | ␉␉}␊ |
1103 | ␉}␊ |
1104 | ␊ |
1105 | ␉␊ |
1106 | ␉symbolList_t* entry = moduleSymbols;␊ |
1107 | ␉while(entry)␊ |
1108 | ␉{␊ |
1109 | ␉␉if(strcmp(entry->symbol, name) == 0)␊ |
1110 | ␉␉{␊ |
1111 | ␉␉␉//DBG("External symbol %s located at 0x%X\n", name, entry->addr);␊ |
1112 | ␉␉␉return entry->addr;␊ |
1113 | ␉␉}␊ |
1114 | ␉␉else␊ |
1115 | ␉␉{␊ |
1116 | ␉␉␉entry = entry->next;␊ |
1117 | ␉␉}␊ |
1118 | ␊ |
1119 | ␉}␊ |
1120 | #if DEBUG_MODULES␊ |
1121 | ␉if(strcmp(name, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
1122 | ␉{␊ |
1123 | ␉␉verbose("Unable to locate symbol %s\n", name);␊ |
1124 | ␉␉//getc();␊ |
1125 | ␉}␊ |
1126 | #endif␊ |
1127 | ␉return 0xFFFFFFFF;␊ |
1128 | }␊ |
1129 | ␊ |
1130 | ␊ |
1131 | /*␊ |
1132 | * parse the symbol table␊ |
1133 | * Lookup any undefined symbols␊ |
1134 | */␊ |
1135 | ␊ |
1136 | unsigned int handle_symtable(UInt32 base, struct symtab_command* symtabCommand, long long(*symbol_handler)(char*, long long, char), char is64)␊ |
1137 | {␊ |
1138 | ␉// TODO: verify that the _TEXT,_text segment starts at the same locaiton in the file. If not␊ |
1139 | ␉//␉␉␉subtract the vmaddress and add the actual file address back on. (NOTE: if compiled properly, not needed)␊ |
1140 | ␉␊ |
1141 | ␉unsigned int module_start = 0xFFFFFFFF;␊ |
1142 | ␉␊ |
1143 | ␉UInt32 symbolIndex = 0;␊ |
1144 | ␉char* symbolString = base + (char*)symtabCommand->stroff;␊ |
1145 | ␉//char* symbolTable = base + symtabCommand->symoff;␊ |
1146 | ␉if(!is64)␊ |
1147 | ␉{␊ |
1148 | ␉␉struct nlist* symbolEntry = (void*)base + symtabCommand->symoff;␊ |
1149 | ␉␉while(symbolIndex < symtabCommand->nsyms)␊ |
1150 | ␉␉{␊ |
1151 | ␉␉␉// If the symbol is exported by this module␊ |
1152 | ␉␉␉if(symbolEntry->n_value &&␊ |
1153 | ␉␉␉ symbol_handler(symbolString + symbolEntry->n_un.n_strx, (long long)base + symbolEntry->n_value, is64) != 0xFFFFFFFF)␊ |
1154 | ␉␉␉{␊ |
1155 | ␉␉␉␉␊ |
1156 | ␉␉␉␉// Module start located. Start is an alias so don't register it␊ |
1157 | ␉␉␉␉module_start = base + symbolEntry->n_value;␊ |
1158 | ␉␉␉}␊ |
1159 | ␉␉␉␊ |
1160 | ␉␉␉symbolEntry++;␊ |
1161 | ␉␉␉symbolIndex++;␉// TODO remove␊ |
1162 | ␉␉}␊ |
1163 | ␉}␊ |
1164 | ␉else␊ |
1165 | ␉{␊ |
1166 | ␉␉struct nlist_64* symbolEntry = (void*)base + symtabCommand->symoff;␊ |
1167 | ␉␉// NOTE First entry is *not* correct, but we can ignore it (i'm getting radar:// right now)␉␊ |
1168 | ␉␉while(symbolIndex < symtabCommand->nsyms)␊ |
1169 | ␉␉{␊ |
1170 | ␉␉␉␊ |
1171 | ␉␉␉␊ |
1172 | ␉␉␉// If the symbol is exported by this module␊ |
1173 | ␉␉␉if(symbolEntry->n_value &&␊ |
1174 | ␉␉␉ symbol_handler(symbolString + symbolEntry->n_un.n_strx, (long long)base + symbolEntry->n_value, is64) != 0xFFFFFFFF)␊ |
1175 | ␉␉␉{␊ |
1176 | ␉␉␉␉␊ |
1177 | ␉␉␉␉// Module start located. Start is an alias so don't register it␊ |
1178 | ␉␉␉␉module_start = base + symbolEntry->n_value;␊ |
1179 | ␉␉␉}␊ |
1180 | ␉␉␉␊ |
1181 | ␉␉␉symbolEntry++;␊ |
1182 | ␉␉␉symbolIndex++;␉// TODO remove␊ |
1183 | ␉␉}␊ |
1184 | ␉}␊ |
1185 | ␉␉␊ |
1186 | ␉return module_start;␊ |
1187 | ␉␊ |
1188 | }␊ |
1189 | ␊ |
1190 | ␊ |
1191 | /*␊ |
1192 | * Locate the symbol for an already loaded function and modify the beginning of␊ |
1193 | * the function to jump directly to the new one␊ |
1194 | * example: replace_function("_HelloWorld_start", &replacement_start);␊ |
1195 | */␊ |
1196 | int replace_function(const char* symbol, void* newAddress)␊ |
1197 | {␊ |
1198 | ␉UInt32* jumpPointer = malloc(sizeof(UInt32*));␉ ␊ |
1199 | ␉// TODO: look into using the next four bytes of the function instead␊ |
1200 | ␉// Most functions should support this, as they probably will be at ␊ |
1201 | ␉// least 10 bytes long, but you never know, this is sligtly safer as␊ |
1202 | ␉// function can be as small as 6 bytes.␊ |
1203 | ␉UInt32 addr = lookup_all_symbols(symbol);␊ |
1204 | ␉␊ |
1205 | ␉char* binary = (char*)addr;␊ |
1206 | ␉if(addr != 0xFFFFFFFF)␊ |
1207 | ␉{␊ |
1208 | ␉␉*binary++ = 0xFF;␉// Jump␊ |
1209 | ␉␉*binary++ = 0x25;␉// Long Jump␊ |
1210 | ␉␉*((UInt32*)binary) = (UInt32)jumpPointer;␊ |
1211 | ␉␉␊ |
1212 | ␉␉*jumpPointer = (UInt32)newAddress;␊ |
1213 | ␉␉␊ |
1214 | ␉␉return 1;␊ |
1215 | ␉}␊ |
1216 | ␉else ␊ |
1217 | ␉{␊ |
1218 | ␉␉return 0;␊ |
1219 | ␉}␊ |
1220 | ␊ |
1221 | }␊ |
1222 | ␊ |
1223 | ␊ |
1224 | /* Nedded to divide 64bit numbers correctly. TODO: look into why modules need this␊ |
1225 | * And why it isn't needed when compiled into boot2␊ |
1226 | */␊ |
1227 | ␊ |
1228 | uint64_t __udivdi3(uint64_t numerator, uint64_t denominator)␊ |
1229 | {␊ |
1230 | ␉uint64_t quotient = 0, qbit = 1;␊ |
1231 | ␉␊ |
1232 | ␉if (denominator)␊ |
1233 | ␉{␊ |
1234 | ␉␉while ((int64_t) denominator >= 0)␊ |
1235 | ␉␉{␊ |
1236 | ␉␉␉denominator <<= 1;␊ |
1237 | ␉␉␉qbit <<= 1;␊ |
1238 | ␉␉}␊ |
1239 | ␉␉␊ |
1240 | ␉␉while (denominator)␊ |
1241 | ␉␉{␊ |
1242 | ␉␉␉if (denominator <= numerator)␊ |
1243 | ␉␉␉{␊ |
1244 | ␉␉␉␉numerator -= denominator;␊ |
1245 | ␉␉␉␉quotient += qbit;␊ |
1246 | ␉␉␉}␊ |
1247 | ␉␉␉denominator >>= 1;␊ |
1248 | ␉␉␉qbit >>= 1;␊ |
1249 | ␉␉}␊ |
1250 | ␉␉␊ |
1251 | ␉␉return quotient;␊ |
1252 | ␉}␊ |
1253 | ␉else {␊ |
1254 | ␉␉stop("Divide by 0");␊ |
1255 | ␉␉return 0;␊ |
1256 | ␉}␊ |
1257 | ␉␊ |
1258 | }␊ |
1259 |