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...)␊ |
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 1 //DEBUG_MODULES␊ |
39 | void print_hook_list()␊ |
40 | {␊ |
41 | ␉msglog("---Hook Table---\n");␊ |
42 | ␊ |
43 | ␉moduleHook_t* hooks = moduleCallbacks;␊ |
44 | ␉while(hooks)␊ |
45 | ␉{␊ |
46 | ␉␉msglog("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 | ␉␉␉strcpy(tmp, name);␊ |
123 | ␉␉␉␊ |
124 | ␉␉␉DBG("Attempting to load %s\n", tmp);␉␉␉␊ |
125 | ␉␉␉if(!load_module(tmp))␊ |
126 | ␉␉␉{␊ |
127 | ␉␉␉␉// failed to load␊ |
128 | ␉␉␉␉// free(tmp);␊ |
129 | ␉␉␉␉DBG("...failed to load\n");␊ |
130 | ␉␉␉}␊ |
131 | ␉␉}␊ |
132 | ␉␉else ␊ |
133 | ␉␉{␊ |
134 | ␉␉␉DBG("Ignoring %s\n", name);␊ |
135 | ␉␉}␊ |
136 | ␊ |
137 | ␉}␊ |
138 | }␊ |
139 | ␊ |
140 | ␊ |
141 | /*␊ |
142 | * Load a module file in /Extra/modules␊ |
143 | * TODO: verify version number of module␊ |
144 | */␊ |
145 | int load_module(char* module)␊ |
146 | {␊ |
147 | ␉void (*module_start)(void) = NULL;␊ |
148 | ␊ |
149 | ␉␊ |
150 | ␉// Check to see if the module has already been loaded␊ |
151 | ␉if(is_module_loaded(module))␊ |
152 | ␉{␊ |
153 | ␉␉// NOTE: Symbols.dylib tries to load twice, this catches it as well␊ |
154 | ␉␉// as when a module links with an already loaded module␊ |
155 | ␉␉DBG("Module %s already loaded\n", module);␊ |
156 | ␉␉return 1;␊ |
157 | ␉}␊ |
158 | ␉␊ |
159 | ␉char modString[128];␊ |
160 | ␉int fh = -1;␊ |
161 | ␉sprintf(modString, "/Extra/modules/%s", module);␊ |
162 | ␉fh = open(modString, 0);␊ |
163 | ␉if(fh < 0)␊ |
164 | ␉{␊ |
165 | ␉␉verbose("Unable to locate module %s\n", modString);␊ |
166 | ␉␉getc();␊ |
167 | ␉␉return 0;␊ |
168 | ␉}␊ |
169 | ␉␊ |
170 | ␉unsigned int moduleSize = file_size(fh);␊ |
171 | ␉char* module_base = (char*) malloc(moduleSize);␊ |
172 | ␉if (moduleSize && read(fh, module_base, moduleSize) == moduleSize)␊ |
173 | ␉{␊ |
174 | ␊ |
175 | ␉␉DBG("Module %s read in.\n", modString);␊ |
176 | ␊ |
177 | ␉␉// Module loaded into memory, parse it␊ |
178 | ␉␉module_start = parse_mach(module_base, &load_module, &add_symbol);␊ |
179 | ␊ |
180 | ␉␉if(module_start && module_start != (void*)0xFFFFFFFF)␊ |
181 | ␉␉{␊ |
182 | ␉␉␉// Notify the system that it was laoded␊ |
183 | ␉␉␉module_loaded(module/*moduleName, moduleVersion, moduleCompat*/);␊ |
184 | ␉␉␉(*module_start)();␉// Start the module␊ |
185 | ␉␉␉verbose("Module %s Loaded.\n", module);␊ |
186 | ␉␉}␊ |
187 | ␉␉else {␊ |
188 | ␉␉␉// The module does not have a valid start function␊ |
189 | ␉␉␉verbose("Unable to start %s\n", module);␊ |
190 | ␉␉␉getc();␊ |
191 | ␉␉}␉␉␊ |
192 | ␉}␊ |
193 | ␉else␊ |
194 | ␉{␊ |
195 | ␉␉DBG("Unable to read in module %s\n.", module);␊ |
196 | ␉␉//getc();␊ |
197 | ␉}␊ |
198 | ␉close(fh);␊ |
199 | ␉return 1;␊ |
200 | }␊ |
201 | ␊ |
202 | /*␊ |
203 | *␉execute_hook( const char* name )␊ |
204 | *␉␉name - Name of the module hook␊ |
205 | *␉␉␉If any callbacks have been registered for this hook␊ |
206 | *␉␉␉they will be executed now in the same order that the␊ |
207 | *␉␉␉hooks were added.␊ |
208 | */␊ |
209 | int execute_hook(const char* name, void* arg1, void* arg2, void* arg3, void* arg4)␊ |
210 | {␊ |
211 | ␉DBG("Attempting to execute hook '%s'\n", name);␊ |
212 | ␉moduleHook_t* hooks = moduleCallbacks;␊ |
213 | ␊ |
214 | ␉while(hooks && strcmp(name, hooks->name) < 0)␊ |
215 | ␉{␊ |
216 | ␉␉//DBG("%s cmp %s = %d\n", name, hooks->name, strcmp(name, hooks->name));␊ |
217 | ␉␉hooks = hooks->next;␊ |
218 | ␉}␊ |
219 | ␊ |
220 | ␉if(hooks && strcmp(name, hooks->name) == 0)␊ |
221 | ␉{␊ |
222 | ␉␉// Loop through all callbacks for this module␊ |
223 | ␉␉callbackList_t* callbacks = hooks->callbacks;␊ |
224 | ␉␉␊ |
225 | ␉␉while(callbacks)␊ |
226 | ␉␉{␊ |
227 | ␉␉␉DBG("Executing '%s' with callback 0x%X.\n", name, callbacks->callback);␊ |
228 | ␉␉␉// Execute callback␊ |
229 | ␉␉␉callbacks->callback(arg1, arg2, arg3, arg4);␊ |
230 | ␉␉␉callbacks = callbacks->next;␊ |
231 | ␉␉␉DBG("Hook '%s' callback executed, next is 0x%X.\n", name, callbacks);␊ |
232 | ␉␉␉␊ |
233 | ␉␉}␊ |
234 | ␉␉DBG("Hook '%s' executed.\n", name);␊ |
235 | ␉␉␊ |
236 | ␉␉return 1;␊ |
237 | ␉}␊ |
238 | ␉else␊ |
239 | ␉{␊ |
240 | ␉␉DBG("No callbacks for '%s' hook.\n", name);␊ |
241 | ␉␉␊ |
242 | ␉␉// Callbaack for this module doesn't exist;␊ |
243 | ␉␉//verbose("Unable execute hook '%s', no callbacks registered.\n", name);␊ |
244 | ␉␉//pause();␊ |
245 | ␉␉return 0;␊ |
246 | ␉}␊ |
247 | }␊ |
248 | ␊ |
249 | ␊ |
250 | ␊ |
251 | /*␊ |
252 | *␉register_hook_callback( const char* name, void(*callback)())␊ |
253 | *␉␉name - Name of the module hook to attach to.␊ |
254 | *␉␉callbacks - The funciton pointer that will be called when the␊ |
255 | *␉␉␉hook is executed. When registering a new callback name, the callback is added sorted.␊ |
256 | *␉␉␉NOTE: the hooks take four void* arguments.␊ |
257 | *␉␉␉TODO: refactor␊ |
258 | */␊ |
259 | void register_hook_callback(const char* name, void(*callback)(void*, void*, void*, void*))␊ |
260 | {␉␊ |
261 | ␉DBG("Adding callback for '%s' hook.\n", name);␊ |
262 | ␊ |
263 | ␉moduleHook_t* newHook = malloc(sizeof(moduleHook_t));␊ |
264 | ␉if(!moduleCallbacks)␊ |
265 | ␉{␊ |
266 | ␉␉newHook->next = moduleCallbacks;␊ |
267 | ␉␉moduleCallbacks = newHook;␊ |
268 | ␉␉␊ |
269 | ␉␉newHook->name = name;␊ |
270 | ␉␉newHook->callbacks = (callbackList_t*)malloc(sizeof(callbackList_t));␊ |
271 | ␉␉newHook->callbacks->callback = callback;␊ |
272 | ␉␉newHook->callbacks->next = NULL;␊ |
273 | ␉}␊ |
274 | ␉else␊ |
275 | ␉{␊ |
276 | ␉␉moduleHook_t* hooks = moduleCallbacks;␊ |
277 | ␉␉␊ |
278 | ␉␉while(hooks->next && strcmp(name, hooks->next->name) < 0)␊ |
279 | ␉␉{␊ |
280 | ␉␉␉hooks = hooks->next;␊ |
281 | ␉␉}␊ |
282 | ␉␉␊ |
283 | ␉␉if(!hooks->next)␊ |
284 | ␉␉{␊ |
285 | ␉␉␉// Appent to the end␊ |
286 | ␉␉␉newHook->next = NULL;␊ |
287 | ␉␉␉hooks->next = newHook;␊ |
288 | ␉␉␉newHook->name = name;␊ |
289 | ␉␉␉newHook->callbacks = (callbackList_t*)malloc(sizeof(callbackList_t));␊ |
290 | ␉␉␉newHook->callbacks->callback = callback;␊ |
291 | ␉␉␉newHook->callbacks->next = NULL;␊ |
292 | ␉␉␉␊ |
293 | ␉␉␉␊ |
294 | ␉␉}␊ |
295 | ␉␉else if(strcmp(name, hooks->next->name) == 0)␊ |
296 | ␉␉{␊ |
297 | ␉␉␉// We found the hook␊ |
298 | ␉␉␉// Hook alreday exists, add a callback to this hook␊ |
299 | ␉␉␉callbackList_t* callbacks = hooks->next->callbacks;␊ |
300 | ␉␉␉while(callbacks->next != NULL)␊ |
301 | ␉␉␉{␊ |
302 | ␉␉␉␉callbacks = callbacks->next;␊ |
303 | ␉␉␉}␊ |
304 | ␉␉␉// Add new entry to end of hook list.␊ |
305 | ␉␉␉callbacks->next = (callbackList_t*)malloc(sizeof(callbackList_t));␊ |
306 | ␉␉␉callbacks = callbacks->next;␊ |
307 | ␉␉␉callbacks->next = NULL;␊ |
308 | ␉␉␉callbacks->callback = callback;␊ |
309 | ␉␉}␊ |
310 | ␉␉else␊ |
311 | ␉␉{␊ |
312 | ␉␉␉// We are too far beyond the hook␊ |
313 | ␉␉␉newHook->next = hooks->next;␊ |
314 | ␉␉␉hooks->next = newHook;␊ |
315 | ␉␉␉newHook->name = name;␊ |
316 | ␉␉␉newHook->callbacks = (callbackList_t*)malloc(sizeof(callbackList_t));␊ |
317 | ␉␉␉newHook->callbacks->callback = callback;␊ |
318 | ␉␉␉newHook->callbacks->next = NULL;␊ |
319 | ␉␉␉␊ |
320 | ␉␉}␊ |
321 | ␉}␊ |
322 | #if 1 //DEBUG_MODULES␊ |
323 | ␉print_hook_list();␊ |
324 | ␉//getc();␊ |
325 | #endif␊ |
326 | ␉␊ |
327 | }␊ |
328 | ␊ |
329 | ␊ |
330 | /*␊ |
331 | * Parse through a macho module. The module will be rebased and binded␊ |
332 | * as specified in the macho header. If the module is sucessfuly laoded␊ |
333 | * the module iinit address will be returned.␊ |
334 | * NOTE; all dependecies will be loaded before this module is started␊ |
335 | * NOTE: If the module is unable to load ot completeion, the modules␊ |
336 | * symbols will still be available (TODO: fix this). This should not␊ |
337 | * happen as all dependencies are verified before the sybols are read in.␊ |
338 | */␊ |
339 | void* parse_mach(void* binary, int(*dylib_loader)(char*), long long(*symbol_handler)(char*, long long, char))␉// TODO: add param to specify valid archs␊ |
340 | {␉␊ |
341 | ␉char is64 = false;␊ |
342 | ␉void (*module_start)(void) = NULL;␊ |
343 | ␉␊ |
344 | ␉// Module info␊ |
345 | ␉/*char* moduleName = NULL;␊ |
346 | ␉UInt32 moduleVersion = 0;␊ |
347 | ␉UInt32 moduleCompat = 0;␊ |
348 | ␉*/␊ |
349 | ␉// TODO convert all of the structs to a union␊ |
350 | ␉struct load_command *loadCommand = NULL;␊ |
351 | ␉struct dylib_command* dylibCommand = NULL;␊ |
352 | ␉struct dyld_info_command* dyldInfoCommand = NULL;␊ |
353 | ␉␊ |
354 | ␉struct symtab_command* symtabCommand = NULL;␊ |
355 | ␉struct segment_command *segCommand = NULL;␊ |
356 | ␉struct segment_command_64 *segCommand64 = NULL;␊ |
357 | ␊ |
358 | ␉//struct dysymtab_command* dysymtabCommand = NULL;␊ |
359 | ␉UInt32 binaryIndex = 0;␊ |
360 | ␉UInt16 cmd = 0;␊ |
361 | ␊ |
362 | ␉// Parse through the load commands␊ |
363 | ␉if(((struct mach_header*)binary)->magic == MH_MAGIC)␊ |
364 | ␉{␊ |
365 | ␉␉is64 = false;␊ |
366 | ␉␉binaryIndex += sizeof(struct mach_header);␊ |
367 | ␉}␊ |
368 | ␉else if(((struct mach_header_64*)binary)->magic == MH_MAGIC_64)␊ |
369 | ␉{␊ |
370 | ␉␉// NOTE: modules cannot be 64bit...␊ |
371 | ␉␉is64 = true;␊ |
372 | ␉␉binaryIndex += sizeof(struct mach_header_64);␊ |
373 | ␉}␊ |
374 | ␉else␊ |
375 | ␉{␊ |
376 | ␉␉verbose("Invalid mach magic\n");␊ |
377 | ␉␉getc();␊ |
378 | ␉␉return NULL;␊ |
379 | ␉}␊ |
380 | ␊ |
381 | ␊ |
382 | ␉␊ |
383 | ␉/*if(((struct mach_header*)binary)->filetype != MH_DYLIB)␊ |
384 | ␉{␊ |
385 | ␉␉verbose("Module is not a dylib. Unable to load.\n");␊ |
386 | ␉␉getc();␊ |
387 | ␉␉return NULL; // Module is in the incorrect format␊ |
388 | ␉}*/␊ |
389 | ␉␊ |
390 | ␉while(cmd < ((struct mach_header*)binary)->ncmds)␊ |
391 | ␉{␊ |
392 | ␉␉cmd++;␊ |
393 | ␉␉␊ |
394 | ␉␉loadCommand = binary + binaryIndex;␊ |
395 | ␉␉UInt32 cmdSize = loadCommand->cmdsize;␊ |
396 | ␊ |
397 | ␉␉␊ |
398 | ␉␉switch ((loadCommand->cmd & 0x7FFFFFFF))␊ |
399 | ␉␉{␊ |
400 | ␉␉␉␉// TODO: sepeare function to handel appropriate sections␊ |
401 | ␉␉␉case LC_SYMTAB:␊ |
402 | ␉␉␉␉symtabCommand = binary + binaryIndex;␊ |
403 | ␉␉␉␉break;␊ |
404 | ␉␉␉␉␊ |
405 | ␉␉␉case LC_SEGMENT: // 32bit macho␊ |
406 | ␉␉␉␉segCommand = binary + binaryIndex;␊ |
407 | ␉␉␉␉␊ |
408 | ␉␉␉␉//printf("Segment name is %s\n", segCommand->segname);␊ |
409 | ␉␉␉␉␊ |
410 | ␉␉␉␉if(strcmp("__TEXT", segCommand->segname) == 0)␊ |
411 | ␉␉␉␉{␊ |
412 | ␉␉␉␉␉UInt32 sectionIndex;␊ |
413 | ␉␉␉␉␉␊ |
414 | ␉␉␉␉␉sectionIndex = sizeof(struct segment_command);␊ |
415 | ␉␉␉␉␉␊ |
416 | ␉␉␉␉␉struct section *sect;␊ |
417 | ␉␉␉␉␉␊ |
418 | ␉␉␉␉␉while(sectionIndex < segCommand->cmdsize)␊ |
419 | ␉␉␉␉␉{␊ |
420 | ␉␉␉␉␉␉sect = binary + binaryIndex + sectionIndex;␊ |
421 | ␉␉␉␉␉␉␊ |
422 | ␉␉␉␉␉␉sectionIndex += sizeof(struct section);␊ |
423 | ␉␉␉␉␉␉␊ |
424 | ␉␉␉␉␉␉␊ |
425 | ␉␉␉␉␉␉if(strcmp("__text", sect->sectname) == 0)␊ |
426 | ␉␉␉␉␉␉{␊ |
427 | ␉␉␉␉␉␉␉// __TEXT,__text found, save the offset and address for when looking for the calls.␊ |
428 | ␉␉␉␉␉␉␉textSection = sect->offset;␊ |
429 | ␉␉␉␉␉␉␉textAddress = sect->addr;␊ |
430 | ␉␉␉␉␉␉␉break;␊ |
431 | ␉␉␉␉␉␉}␉␉␉␉␉␊ |
432 | ␉␉␉␉␉}␊ |
433 | ␉␉␉␉}␊ |
434 | ␉␉␉␉else if(strcmp("__DATA", segCommand->segname) == 0)␊ |
435 | ␉␉␉␉{␊ |
436 | ␉␉␉␉␉UInt32 sectionIndex;␊ |
437 | ␉␉␉␉␉␊ |
438 | ␉␉␉␉␉sectionIndex = sizeof(struct segment_command);␊ |
439 | ␉␉␉␉␉␊ |
440 | ␉␉␉␉␉struct section *sect;␊ |
441 | ␉␉␉␉␉␊ |
442 | ␉␉␉␉␉while(sectionIndex < segCommand->cmdsize)␊ |
443 | ␉␉␉␉␉{␊ |
444 | ␉␉␉␉␉␉sect = binary + binaryIndex + sectionIndex;␊ |
445 | ␉␉␉␉␉␉␊ |
446 | ␉␉␉␉␉␉sectionIndex += sizeof(struct section);␊ |
447 | ␉␉␉␉␉␉␊ |
448 | ␉␉␉␉␉␉␊ |
449 | ␉␉␉␉␉␉if(strcmp("__bss", sect->sectname) == 0)␊ |
450 | ␉␉␉␉␉␉{␊ |
451 | ␉␉␉␉␉␉␉// __TEXT,__text found, save the offset and address for when looking for the calls.␊ |
452 | ␉␉␉␉␉␉␉//printf("__DATA,__bss found.\n"); getc();␊ |
453 | ␉␉␉␉␉␉␉break;␊ |
454 | ␉␉␉␉␉␉}␉␉␉␉␉␊ |
455 | ␉␉␉␉␉}␊ |
456 | ␉␉␉␉␉␊ |
457 | ␉␉␉␉}␊ |
458 | ␊ |
459 | ␉␉␉␉break;␊ |
460 | ␉␉␉case LC_SEGMENT_64:␉// 64bit macho's␊ |
461 | ␉␉␉␉segCommand64 = binary + binaryIndex;␊ |
462 | ␉␉␉␉␊ |
463 | ␉␉␉␉//printf("Segment name is %s\n", segCommand->segname);␊ |
464 | ␉␉␉␉␊ |
465 | ␉␉␉␉if(strcmp("__TEXT", segCommand64->segname) == 0)␊ |
466 | ␉␉␉␉{␊ |
467 | ␉␉␉␉␉UInt32 sectionIndex;␊ |
468 | ␉␉␉␉␉␊ |
469 | ␉␉␉␉␉sectionIndex = sizeof(struct segment_command_64);␊ |
470 | ␉␉␉␉␉␊ |
471 | ␉␉␉␉␉struct section_64 *sect;␊ |
472 | ␉␉␉␉␉␊ |
473 | ␉␉␉␉␉while(sectionIndex < segCommand64->cmdsize)␊ |
474 | ␉␉␉␉␉{␊ |
475 | ␉␉␉␉␉␉sect = binary + binaryIndex + sectionIndex;␊ |
476 | ␉␉␉␉␉␉␊ |
477 | ␉␉␉␉␉␉sectionIndex += sizeof(struct section_64);␊ |
478 | ␉␉␉␉␉␉␊ |
479 | ␉␉␉␉␉␉␊ |
480 | ␉␉␉␉␉␉if(strcmp("__text", sect->sectname) == 0)␊ |
481 | ␉␉␉␉␉␉{␊ |
482 | ␉␉␉␉␉␉␉// __TEXT,__text found, save the offset and address for when looking for the calls.␊ |
483 | ␉␉␉␉␉␉␉textSection = sect->offset;␊ |
484 | ␉␉␉␉␉␉␉textAddress = sect->addr;␊ |
485 | ␉␉␉␉␉␉␉␊ |
486 | ␉␉␉␉␉␉␉break;␊ |
487 | ␉␉␉␉␉␉}␉␉␉␉␉␊ |
488 | ␉␉␉␉␉}␊ |
489 | ␉␉␉␉}␊ |
490 | ␉␉␉␉else if(strcmp("__DATA", segCommand->segname) == 0)␊ |
491 | ␉␉␉␉{␊ |
492 | ␉␉␉␉␉UInt32 sectionIndex;␊ |
493 | ␉␉␉␉␉␊ |
494 | ␉␉␉␉␉sectionIndex = sizeof(struct segment_command_64);␊ |
495 | ␉␉␉␉␉␊ |
496 | ␉␉␉␉␉struct section_64 *sect;␊ |
497 | ␉␉␉␉␉␊ |
498 | ␉␉␉␉␉while(sectionIndex < segCommand->cmdsize)␊ |
499 | ␉␉␉␉␉{␊ |
500 | ␉␉␉␉␉␉sect = binary + binaryIndex + sectionIndex;␊ |
501 | ␉␉␉␉␉␉␊ |
502 | ␉␉␉␉␉␉sectionIndex += sizeof(struct section);␊ |
503 | ␉␉␉␉␉␉␊ |
504 | ␉␉␉␉␉␉␊ |
505 | ␉␉␉␉␉␉if(strcmp("__bss", sect->sectname) == 0)␊ |
506 | ␉␉␉␉␉␉{␊ |
507 | ␉␉␉␉␉␉␉// __TEXT,__text found, save the offset and address for when looking for the calls.␊ |
508 | ␉␉␉␉␉␉␉//printf("__DATA,__bss found.\n"); getc();␊ |
509 | ␉␉␉␉␉␉␉break;␊ |
510 | ␉␉␉␉␉␉}␉␉␉␉␉␊ |
511 | ␉␉␉␉␉}␊ |
512 | ␉␉␉␉␉␊ |
513 | ␉␉␉␉}␊ |
514 | ␉␉␉␉␊ |
515 | ␉␉␉␉␊ |
516 | ␉␉␉␉break;␊ |
517 | ␉␉␉␉␊ |
518 | ␉␉␉case LC_DYSYMTAB:␊ |
519 | ␉␉␉␉break;␊ |
520 | ␉␉␉␉␊ |
521 | ␉␉␉case LC_LOAD_DYLIB:␊ |
522 | ␉␉␉case LC_LOAD_WEAK_DYLIB ^ LC_REQ_DYLD:␊ |
523 | ␉␉␉␉dylibCommand = binary + binaryIndex;␊ |
524 | ␉␉␉␉char* module = binary + binaryIndex + ((UInt32)*((UInt32*)&dylibCommand->dylib.name));␊ |
525 | ␉␉␉␉// TODO: verify version␊ |
526 | ␉␉␉␉// =␉dylibCommand->dylib.current_version;␊ |
527 | ␉␉␉␉// =␉dylibCommand->dylib.compatibility_version;␊ |
528 | ␉␉␉␉if(dylib_loader)␊ |
529 | ␉␉␉␉{␊ |
530 | ␉␉␉␉␉char* name = malloc(strlen(module) + strlen(".dylib") + 1);␊ |
531 | ␉␉␉␉␉sprintf(name, "%s.dylib", module);␊ |
532 | ␊ |
533 | ␉␉␉␉␉if (!dylib_loader(name))␊ |
534 | ␉␉␉␉␉{␊ |
535 | ␉␉␉␉␉␉free(name);␊ |
536 | ␉␉␉␉␉␉verbose("Unable to load dependency...\n");␊ |
537 | ␉␉␉␉␉␉//return NULL;␊ |
538 | ␉␉␉␉␉}␊ |
539 | ␉␉␉␉}␊ |
540 | ␊ |
541 | ␉␉␉␉break;␊ |
542 | ␉␉␉␉␊ |
543 | ␉␉␉case LC_ID_DYLIB:␊ |
544 | ␉␉␉␉dylibCommand = binary + binaryIndex;␊ |
545 | ␉␉␉␉/*moduleName =␉binary + binaryIndex + ((UInt32)*((UInt32*)&dylibCommand->dylib.name));␊ |
546 | ␉␉␉␉moduleVersion =␉dylibCommand->dylib.current_version;␊ |
547 | ␉␉␉␉moduleCompat =␉dylibCommand->dylib.compatibility_version;␊ |
548 | ␉␉␉␉ */␊ |
549 | ␉␉␉␉break;␊ |
550 | ␊ |
551 | ␉␉␉case LC_DYLD_INFO:␊ |
552 | ␉␉␉␉// Bind and rebase info is stored here␊ |
553 | ␉␉␉␉dyldInfoCommand = binary + binaryIndex;␊ |
554 | ␉␉␉␉break;␊ |
555 | ␉␉␉␉␊ |
556 | ␉␉␉case LC_UUID:␊ |
557 | ␉␉␉␉break;␊ |
558 | ␉␉␉␉␊ |
559 | ␉␉␉case LC_UNIXTHREAD:␊ |
560 | ␉␉␉␉break;␊ |
561 | ␉␉␉␉␊ |
562 | ␉␉␉default:␊ |
563 | ␉␉␉␉DBG("Unhandled loadcommand 0x%X\n", loadCommand->cmd & 0x7FFFFFFF);␊ |
564 | ␉␉␉␉break;␊ |
565 | ␉␉␊ |
566 | ␉␉}␊ |
567 | ␊ |
568 | ␉␉binaryIndex += cmdSize;␊ |
569 | ␉}␊ |
570 | ␉//if(!moduleName) return NULL;␊ |
571 | ␉␉␊ |
572 | ␊ |
573 | ␉// bind_macho uses the symbols.␊ |
574 | ␉module_start = (void*)handle_symtable((UInt32)binary, symtabCommand, symbol_handler, is64);␊ |
575 | ␊ |
576 | ␉// Rebase the module before binding it.␊ |
577 | ␉if(dyldInfoCommand && dyldInfoCommand->rebase_off)␊ |
578 | ␉{␊ |
579 | ␉␉rebase_macho(binary, (char*)dyldInfoCommand->rebase_off, dyldInfoCommand->rebase_size);␊ |
580 | ␉}␊ |
581 | ␉␊ |
582 | ␉if(dyldInfoCommand && dyldInfoCommand->bind_off)␊ |
583 | ␉{␊ |
584 | ␉␉bind_macho(binary, (char*)dyldInfoCommand->bind_off, dyldInfoCommand->bind_size);␊ |
585 | ␉}␊ |
586 | ␉␊ |
587 | ␉if(dyldInfoCommand && dyldInfoCommand->weak_bind_off)␊ |
588 | ␉{␊ |
589 | ␉␉// NOTE: this currently should never happen.␊ |
590 | ␉␉bind_macho(binary, (char*)dyldInfoCommand->weak_bind_off, dyldInfoCommand->weak_bind_size);␊ |
591 | ␉}␊ |
592 | ␉␊ |
593 | ␉if(dyldInfoCommand && dyldInfoCommand->lazy_bind_off)␊ |
594 | ␉{␊ |
595 | ␉␉// NOTE: we are binding the lazy pointers as a module is laoded,␊ |
596 | ␉␉// This should be changed to bind when a symbol is referened at runtime instead.␊ |
597 | ␉␉bind_macho(binary, (char*)dyldInfoCommand->lazy_bind_off, dyldInfoCommand->lazy_bind_size);␊ |
598 | ␉}␊ |
599 | ␊ |
600 | ␉return module_start;␊ |
601 | ␉␊ |
602 | }␊ |
603 | ␊ |
604 | ␊ |
605 | // Based on code from dylibinfo.cpp and ImageLoaderMachOCompressed.cpp␊ |
606 | void rebase_macho(void* base, char* rebase_stream, UInt32 size)␊ |
607 | {␊ |
608 | ␉rebase_stream += (UInt32)base;␊ |
609 | ␉␊ |
610 | ␉UInt8 immediate = 0;␊ |
611 | ␉UInt8 opcode = 0;␊ |
612 | ␉UInt8 type = 0;␊ |
613 | ␉␊ |
614 | ␉UInt32 segmentAddress = 0;␊ |
615 | ␉␊ |
616 | ␉␊ |
617 | ␉␊ |
618 | ␉UInt32 tmp = 0;␊ |
619 | ␉UInt32 tmp2 = 0;␊ |
620 | ␉UInt8 bits = 0;␊ |
621 | ␉int index = 0;␊ |
622 | ␉␊ |
623 | ␉//int done = 0;␊ |
624 | ␉unsigned int i = 0;␊ |
625 | ␉␊ |
626 | ␉while(/*!done &&*/ i < size)␊ |
627 | ␉{␊ |
628 | ␉␉immediate = rebase_stream[i] & REBASE_IMMEDIATE_MASK;␊ |
629 | ␉␉opcode = rebase_stream[i] & REBASE_OPCODE_MASK;␊ |
630 | ␊ |
631 | ␉␉␊ |
632 | ␉␉switch(opcode)␊ |
633 | ␉␉{␊ |
634 | ␉␉␉case REBASE_OPCODE_DONE:␊ |
635 | ␉␉␉␉// Rebase complete.␊ |
636 | ␉␉␉␉//done = 1;␊ |
637 | ␉␉␉default:␊ |
638 | ␉␉␉␉break;␊ |
639 | ␉␉␉␉␊ |
640 | ␉␉␉␉␊ |
641 | ␉␉␉case REBASE_OPCODE_SET_TYPE_IMM:␊ |
642 | ␉␉␉␉// Set rebase type (pointer, absolute32, pcrel32)␊ |
643 | ␉␉␉␉//DBG("Rebase type = 0x%X\n", immediate);␊ |
644 | ␉␉␉␉type = immediate;␊ |
645 | ␉␉␉␉break;␊ |
646 | ␉␉␉␉␊ |
647 | ␉␉␉␉␊ |
648 | ␉␉␉case REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:␊ |
649 | ␉␉␉␉// Locate address to begin rebasing␊ |
650 | ␉␉␉␉segmentAddress = 0;␊ |
651 | ␊ |
652 | ␉␉␉␉struct segment_command* segCommand = NULL; // NOTE: 32bit only␊ |
653 | ␉␉␉␉␊ |
654 | ␉␉␉␉unsigned int binIndex = 0;␊ |
655 | ␉␉␉␉index = 0;␊ |
656 | ␉␉␉␉do␊ |
657 | ␉␉␉␉{␊ |
658 | ␉␉␉␉␉segCommand = base + sizeof(struct mach_header) + binIndex;␊ |
659 | ␉␉␉␉␉␊ |
660 | ␉␉␉␉␉␊ |
661 | ␉␉␉␉␉binIndex += segCommand->cmdsize;␊ |
662 | ␉␉␉␉␉index++;␊ |
663 | ␉␉␉␉}␊ |
664 | ␉␉␉␉while(index <= immediate);␊ |
665 | ␊ |
666 | ␊ |
667 | ␉␉␉␉segmentAddress = segCommand->fileoff;␊ |
668 | ␉␉␉␉␊ |
669 | ␉␉␉␉tmp = 0;␊ |
670 | ␉␉␉␉bits = 0;␊ |
671 | ␉␉␉␉do␊ |
672 | ␉␉␉␉{␊ |
673 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
674 | ␉␉␉␉␉bits += 7;␊ |
675 | ␉␉␉␉}␊ |
676 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
677 | ␉␉␉␉␊ |
678 | ␉␉␉␉segmentAddress += tmp;␊ |
679 | ␉␉␉␉break;␊ |
680 | ␉␉␉␉␊ |
681 | ␉␉␉␉␊ |
682 | ␉␉␉case REBASE_OPCODE_ADD_ADDR_ULEB:␊ |
683 | ␉␉␉␉// Add value to rebase address␊ |
684 | ␉␉␉␉tmp = 0;␊ |
685 | ␉␉␉␉bits = 0;␊ |
686 | ␉␉␉␉do␊ |
687 | ␉␉␉␉{␊ |
688 | ␉␉␉␉␉tmp <<= bits;␊ |
689 | ␉␉␉␉␉tmp |= rebase_stream[++i] & 0x7f;␊ |
690 | ␉␉␉␉␉bits += 7;␊ |
691 | ␉␉␉␉}␊ |
692 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
693 | ␉␉␉␉␊ |
694 | ␉␉␉␉segmentAddress +=␉tmp; ␊ |
695 | ␉␉␉␉break;␊ |
696 | ␉␉␉␉␊ |
697 | ␉␉␉case REBASE_OPCODE_ADD_ADDR_IMM_SCALED:␊ |
698 | ␉␉␉␉segmentAddress += immediate * sizeof(void*);␊ |
699 | ␉␉␉␉break;␊ |
700 | ␉␉␉␉␊ |
701 | ␉␉␉␉␊ |
702 | ␉␉␉case REBASE_OPCODE_DO_REBASE_IMM_TIMES:␊ |
703 | ␉␉␉␉index = 0;␊ |
704 | ␉␉␉␉for (index = 0; index < immediate; ++index) {␊ |
705 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␊ |
706 | ␉␉␉␉␉segmentAddress += sizeof(void*);␊ |
707 | ␉␉␉␉}␊ |
708 | ␉␉␉␉break;␊ |
709 | ␉␉␉␊ |
710 | ␉␉␉␉␊ |
711 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ULEB_TIMES:␊ |
712 | ␉␉␉␉tmp = 0;␊ |
713 | ␉␉␉␉bits = 0;␊ |
714 | ␉␉␉␉do␊ |
715 | ␉␉␉␉{␊ |
716 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
717 | ␉␉␉␉␉bits += 7;␊ |
718 | ␉␉␉␉}␊ |
719 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
720 | ␉␉␉␉␊ |
721 | ␉␉␉␉index = 0;␊ |
722 | ␉␉␉␉for (index = 0; index < tmp; ++index) {␊ |
723 | ␉␉␉␉␉//DBG("\tRebasing 0x%X\n", segmentAddress);␊ |
724 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␉␉␉␉␉␊ |
725 | ␉␉␉␉␉segmentAddress += sizeof(void*);␊ |
726 | ␉␉␉␉}␊ |
727 | ␉␉␉␉break;␊ |
728 | ␉␉␉␉␊ |
729 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB:␊ |
730 | ␉␉␉␉tmp = 0;␊ |
731 | ␉␉␉␉bits = 0;␊ |
732 | ␉␉␉␉do␊ |
733 | ␉␉␉␉{␊ |
734 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
735 | ␉␉␉␉␉bits += 7;␊ |
736 | ␉␉␉␉}␊ |
737 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
738 | ␉␉␉␉␊ |
739 | ␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␊ |
740 | ␉␉␉␉␊ |
741 | ␉␉␉␉segmentAddress += tmp + sizeof(void*);␊ |
742 | ␉␉␉␉break;␊ |
743 | ␉␉␉␉␊ |
744 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB:␊ |
745 | ␉␉␉␉tmp = 0;␊ |
746 | ␉␉␉␉bits = 0;␊ |
747 | ␉␉␉␉do␊ |
748 | ␉␉␉␉{␊ |
749 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
750 | ␉␉␉␉␉bits += 7;␊ |
751 | ␉␉␉␉}␊ |
752 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
753 | ␉␉␉␉␊ |
754 | ␉␉␉␉␊ |
755 | ␉␉␉␉tmp2 = 0;␊ |
756 | ␉␉␉␉bits = 0;␊ |
757 | ␉␉␉␉do␊ |
758 | ␉␉␉␉{␊ |
759 | ␉␉␉␉␉tmp2 |= (rebase_stream[++i] & 0x7f) << bits;␊ |
760 | ␉␉␉␉␉bits += 7;␊ |
761 | ␉␉␉␉}␊ |
762 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
763 | ␉␉␉␉␊ |
764 | ␉␉␉␉index = 0;␊ |
765 | ␉␉␉␉for (index = 0; index < tmp; ++index) {␊ |
766 | ␊ |
767 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␊ |
768 | ␉␉␉␉␉␊ |
769 | ␉␉␉␉␉segmentAddress += tmp2 + sizeof(void*);␊ |
770 | ␉␉␉␉}␊ |
771 | ␉␉␉␉break;␊ |
772 | ␉␉}␊ |
773 | ␉␉i++;␊ |
774 | ␉}␊ |
775 | }␊ |
776 | ␊ |
777 | // Based on code from dylibinfo.cpp and ImageLoaderMachOCompressed.cpp␊ |
778 | // NOTE: this uses 32bit values, and not 64bit values. ␊ |
779 | // There is apossibility that this could cause issues,␊ |
780 | // however the macho file is 32 bit, so it shouldn't matter too much␊ |
781 | void bind_macho(void* base, char* bind_stream, UInt32 size)␊ |
782 | {␉␊ |
783 | ␉bind_stream += (UInt32)base;␊ |
784 | ␉␊ |
785 | ␉UInt8 immediate = 0;␊ |
786 | ␉UInt8 opcode = 0;␊ |
787 | ␉UInt8 type = 0;␊ |
788 | ␉␊ |
789 | ␉UInt32 segmentAddress = 0;␊ |
790 | ␉␊ |
791 | ␉UInt32 address = 0;␊ |
792 | ␉␊ |
793 | ␉SInt32 addend = 0;␉␉␉// TODO: handle this␊ |
794 | ␉SInt32 libraryOrdinal = 0;␊ |
795 | ␊ |
796 | ␉const char* symbolName = NULL;␊ |
797 | ␉UInt8 symboFlags = 0;␊ |
798 | ␉UInt32 symbolAddr = 0xFFFFFFFF;␊ |
799 | ␉␊ |
800 | ␉// Temperary variables␊ |
801 | ␉UInt8 bits = 0;␊ |
802 | ␉UInt32 tmp = 0;␊ |
803 | ␉UInt32 tmp2 = 0;␊ |
804 | ␉␊ |
805 | ␉UInt32 index = 0;␊ |
806 | ␉//int done = 0;␊ |
807 | ␉unsigned int i = 0;␊ |
808 | ␉␊ |
809 | ␉while(/*!done &&*/ i < size)␊ |
810 | ␉{␊ |
811 | ␉␉immediate = bind_stream[i] & BIND_IMMEDIATE_MASK;␊ |
812 | ␉␉opcode = bind_stream[i] & BIND_OPCODE_MASK;␊ |
813 | ␉␉␊ |
814 | ␉␉␊ |
815 | ␉␉switch(opcode)␊ |
816 | ␉␉{␊ |
817 | ␉␉␉case BIND_OPCODE_DONE:␊ |
818 | ␉␉␉␉//done = 1; ␊ |
819 | ␉␉␉default:␊ |
820 | ␉␉␉␉break;␊ |
821 | ␉␉␉␉␊ |
822 | ␉␉␉case BIND_OPCODE_SET_DYLIB_ORDINAL_IMM:␊ |
823 | ␉␉␉␉libraryOrdinal = immediate;␊ |
824 | ␉␉␉␉//DBG("BIND_OPCODE_SET_DYLIB_ORDINAL_IMM: %d\n", libraryOrdinal);␊ |
825 | ␉␉␉␉break;␊ |
826 | ␉␉␉␉␊ |
827 | ␉␉␉case BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB:␊ |
828 | ␉␉␉␉libraryOrdinal = 0;␊ |
829 | ␉␉␉␉bits = 0;␊ |
830 | ␉␉␉␉do␊ |
831 | ␉␉␉␉{␊ |
832 | ␉␉␉␉␉libraryOrdinal |= (bind_stream[++i] & 0x7f) << bits;␊ |
833 | ␉␉␉␉␉bits += 7;␊ |
834 | ␉␉␉␉}␊ |
835 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
836 | ␉␉␉␉␊ |
837 | ␉␉␉␉//DBG("BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB: %d\n", libraryOrdinal);␊ |
838 | ␊ |
839 | ␉␉␉␉break;␊ |
840 | ␉␉␉␉␊ |
841 | ␉␉␉case BIND_OPCODE_SET_DYLIB_SPECIAL_IMM:␊ |
842 | ␉␉␉␉// NOTE: this is wrong, fortunately we don't use it␊ |
843 | ␉␉␉␉libraryOrdinal = -immediate;␊ |
844 | ␉␉␉␉//DBG("BIND_OPCODE_SET_DYLIB_SPECIAL_IMM: %d\n", libraryOrdinal);␊ |
845 | ␊ |
846 | ␉␉␉␉break;␊ |
847 | ␉␉␉␉␊ |
848 | ␉␉␉case BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:␊ |
849 | ␉␉␉␉symboFlags = immediate;␊ |
850 | ␉␉␉␉symbolName = (char*)&bind_stream[++i];␊ |
851 | ␉␉␉␉i += strlen((char*)&bind_stream[i]);␊ |
852 | ␉␉␉␉//DBG("BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM: %s, 0x%X\n", symbolName, symboFlags);␊ |
853 | ␊ |
854 | ␉␉␉␉symbolAddr = lookup_all_symbols(symbolName);␊ |
855 | ␊ |
856 | ␉␉␉␉break;␊ |
857 | ␉␉␉␉␊ |
858 | ␉␉␉case BIND_OPCODE_SET_TYPE_IMM:␊ |
859 | ␉␉␉␉// Set bind type (pointer, absolute32, pcrel32)␊ |
860 | ␉␉␉␉type = immediate;␊ |
861 | ␉␉␉␉//DBG("BIND_OPCODE_SET_TYPE_IMM: %d\n", type);␊ |
862 | ␊ |
863 | ␉␉␉␉break;␊ |
864 | ␉␉␉␉␊ |
865 | ␉␉␉case BIND_OPCODE_SET_ADDEND_SLEB:␊ |
866 | ␉␉␉␉addend = 0;␊ |
867 | ␉␉␉␉bits = 0;␊ |
868 | ␉␉␉␉do␊ |
869 | ␉␉␉␉{␊ |
870 | ␉␉␉␉␉addend |= (bind_stream[++i] & 0x7f) << bits;␊ |
871 | ␉␉␉␉␉bits += 7;␊ |
872 | ␉␉␉␉}␊ |
873 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
874 | ␉␉␉␉␊ |
875 | ␉␉␉␉if(!(bind_stream[i-1] & 0x40)) addend *= -1;␊ |
876 | ␉␉␉␉␊ |
877 | ␉␉␉␉//DBG("BIND_OPCODE_SET_ADDEND_SLEB: %d\n", addend);␊ |
878 | ␉␉␉␉break;␊ |
879 | ␉␉␉␉␊ |
880 | ␉␉␉case BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:␊ |
881 | ␉␉␉␉segmentAddress = 0;␊ |
882 | ␊ |
883 | ␉␉␉␉// Locate address␊ |
884 | ␉␉␉␉struct segment_command* segCommand = NULL;␉// NOTE: 32bit only␊ |
885 | ␉␉␉␉␊ |
886 | ␉␉␉␉unsigned int binIndex = 0;␊ |
887 | ␉␉␉␉index = 0;␊ |
888 | ␉␉␉␉do␊ |
889 | ␉␉␉␉{␊ |
890 | ␉␉␉␉␉segCommand = base + sizeof(struct mach_header) + binIndex;␊ |
891 | ␉␉␉␉␉binIndex += segCommand->cmdsize;␊ |
892 | ␉␉␉␉␉index++;␊ |
893 | ␉␉␉␉}␊ |
894 | ␉␉␉␉while(index <= immediate);␊ |
895 | ␉␉␉␉␊ |
896 | ␉␉␉␉segmentAddress = segCommand->fileoff;␊ |
897 | ␉␉␉␉␊ |
898 | ␉␉␉␉// Read in offset␊ |
899 | ␉␉␉␉tmp = 0;␊ |
900 | ␉␉␉␉bits = 0;␊ |
901 | ␉␉␉␉do␊ |
902 | ␉␉␉␉{␊ |
903 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
904 | ␉␉␉␉␉bits += 7;␊ |
905 | ␉␉␉␉}␊ |
906 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
907 | ␉␉␉␉␊ |
908 | ␉␉␉␉segmentAddress += tmp;␊ |
909 | ␉␉␉␉␊ |
910 | ␉␉␉␉//DBG("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: 0x%X\n", segmentAddress);␊ |
911 | ␉␉␉␉break;␊ |
912 | ␉␉␉␉␊ |
913 | ␉␉␉case BIND_OPCODE_ADD_ADDR_ULEB:␊ |
914 | ␉␉␉␉// Read in offset␊ |
915 | ␉␉␉␉tmp = 0;␊ |
916 | ␉␉␉␉bits = 0;␊ |
917 | ␉␉␉␉do␊ |
918 | ␉␉␉␉{␊ |
919 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
920 | ␉␉␉␉␉bits += 7;␊ |
921 | ␉␉␉␉}␊ |
922 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
923 | ␉␉␉␉␊ |
924 | ␉␉␉␉segmentAddress += tmp;␊ |
925 | ␉␉␉␉//DBG("BIND_OPCODE_ADD_ADDR_ULEB: 0x%X\n", segmentAddress);␊ |
926 | ␉␉␉␉break;␊ |
927 | ␉␉␉␉␊ |
928 | ␉␉␉case BIND_OPCODE_DO_BIND:␊ |
929 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND\n");␊ |
930 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
931 | ␉␉␉␉{␊ |
932 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
933 | ␊ |
934 | ␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, BIND_TYPE_POINTER);␊ |
935 | ␉␉␉␉}␊ |
936 | ␉␉␉␉else //if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
937 | ␉␉␉␉{␊ |
938 | ␉␉␉␉␉verbose("Unable to bind symbol %s\n", symbolName);␊ |
939 | ␉␉␉␉␉getc();␊ |
940 | ␉␉␉␉}␊ |
941 | ␉␉␉␉␊ |
942 | ␉␉␉␉segmentAddress += sizeof(void*);␊ |
943 | ␉␉␉␉break;␊ |
944 | ␉␉␉␉␊ |
945 | ␉␉␉case BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:␊ |
946 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB\n");␊ |
947 | ␉␉␉␉␊ |
948 | ␉␉␉␉␊ |
949 | ␉␉␉␉// Read in offset␊ |
950 | ␉␉␉␉tmp = 0;␊ |
951 | ␉␉␉␉bits = 0;␊ |
952 | ␉␉␉␉do␊ |
953 | ␉␉␉␉{␊ |
954 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
955 | ␉␉␉␉␉bits += 7;␊ |
956 | ␉␉␉␉}␊ |
957 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
958 | ␉␉␉␉␊ |
959 | ␉␉␉␉␊ |
960 | ␉␉␉␉␊ |
961 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
962 | ␉␉␉␉{␊ |
963 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
964 | ␊ |
965 | ␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, BIND_TYPE_POINTER);␊ |
966 | ␉␉␉␉}␊ |
967 | ␉␉␉␉else //if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
968 | ␉␉␉␉{␊ |
969 | ␉␉␉␉␉verbose("Unable to bind symbol %s\n", symbolName);␊ |
970 | ␉␉␉␉␉getc();␊ |
971 | ␉␉␉␉}␊ |
972 | ␉␉␉␉segmentAddress += tmp + sizeof(void*);␊ |
973 | ␊ |
974 | ␉␉␉␉␊ |
975 | ␉␉␉␉break;␊ |
976 | ␉␉␉␉␊ |
977 | ␉␉␉case BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED:␊ |
978 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED\n");␊ |
979 | ␉␉␉␉␊ |
980 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
981 | ␉␉␉␉{␊ |
982 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
983 | ␊ |
984 | ␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, BIND_TYPE_POINTER);␊ |
985 | ␉␉␉␉}␊ |
986 | ␉␉␉␉else //if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
987 | ␉␉␉␉{␊ |
988 | ␉␉␉␉␉verbose("Unable to bind symbol %s\n", symbolName);␊ |
989 | ␉␉␉␉␉getc();␊ |
990 | ␉␉␉␉}␊ |
991 | ␉␉␉␉segmentAddress += (immediate * sizeof(void*)) + sizeof(void*);␊ |
992 | ␊ |
993 | ␉␉␉␉␊ |
994 | ␉␉␉␉break;␊ |
995 | ␉␉␉␉␊ |
996 | ␉␉␉case BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:␊ |
997 | ␊ |
998 | ␉␉␉␉tmp = 0;␊ |
999 | ␉␉␉␉bits = 0;␊ |
1000 | ␉␉␉␉do␊ |
1001 | ␉␉␉␉{␊ |
1002 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
1003 | ␉␉␉␉␉bits += 7;␊ |
1004 | ␉␉␉␉}␊ |
1005 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
1006 | ␊ |
1007 | ␉␉␉␉␊ |
1008 | ␉␉␉␉tmp2 = 0;␊ |
1009 | ␉␉␉␉bits = 0;␊ |
1010 | ␉␉␉␉do␊ |
1011 | ␉␉␉␉{␊ |
1012 | ␉␉␉␉␉tmp2 |= (bind_stream[++i] & 0x7f) << bits;␊ |
1013 | ␉␉␉␉␉bits += 7;␊ |
1014 | ␉␉␉␉}␊ |
1015 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
1016 | ␉␉␉␉␊ |
1017 | ␉␉␉␉␊ |
1018 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB 0x%X 0x%X\n", tmp, tmp2);␊ |
1019 | ␊ |
1020 | ␉␉␉␉␊ |
1021 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
1022 | ␉␉␉␉{␊ |
1023 | ␉␉␉␉␉for(index = 0; index < tmp; index++)␊ |
1024 | ␉␉␉␉␉{␊ |
1025 | ␉␉␉␉␉␉␊ |
1026 | ␉␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
1027 | ␊ |
1028 | ␉␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, BIND_TYPE_POINTER);␊ |
1029 | ␉␉␉␉␉␉␊ |
1030 | ␉␉␉␉␉␉segmentAddress += tmp2 + sizeof(void*);␊ |
1031 | ␉␉␉␉␉}␊ |
1032 | ␉␉␉␉}␊ |
1033 | ␉␉␉␉else //if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
1034 | ␉␉␉␉{␊ |
1035 | ␉␉␉␉␉verbose("Unable to bind symbol %s\n", symbolName);␊ |
1036 | ␉␉␉␉␉getc();␊ |
1037 | ␉␉␉␉}␊ |
1038 | ␉␉␉␉␊ |
1039 | ␉␉␉␉␊ |
1040 | ␉␉␉␉break;␊ |
1041 | ␉␉␉␉␊ |
1042 | ␉␉}␊ |
1043 | ␉␉i++;␊ |
1044 | ␉}␊ |
1045 | }␊ |
1046 | ␊ |
1047 | inline void rebase_location(UInt32* location, char* base, int type)␊ |
1048 | {␉␊ |
1049 | ␉switch(type)␊ |
1050 | ␉{␊ |
1051 | ␉␉case REBASE_TYPE_POINTER:␊ |
1052 | ␉␉case REBASE_TYPE_TEXT_ABSOLUTE32:␊ |
1053 | ␉␉␉*location += (UInt32)base;␊ |
1054 | ␉␉␉break;␊ |
1055 | ␉␉␉␊ |
1056 | ␉␉default:␊ |
1057 | ␉␉␉break;␊ |
1058 | ␉}␊ |
1059 | }␊ |
1060 | ␊ |
1061 | inline void bind_location(UInt32* location, char* value, UInt32 addend, int type)␊ |
1062 | {␉␊ |
1063 | ␉// do actual update␊ |
1064 | ␉char* newValue = value + addend;␊ |
1065 | ␊ |
1066 | ␉switch (type) {␊ |
1067 | ␉␉case BIND_TYPE_POINTER:␊ |
1068 | ␉␉case BIND_TYPE_TEXT_ABSOLUTE32:␊ |
1069 | ␉␉␉break;␊ |
1070 | ␊ |
1071 | ␉␉case BIND_TYPE_TEXT_PCREL32:␊ |
1072 | ␉␉␉newValue -= ((UInt32)location + 4);␊ |
1073 | ␊ |
1074 | ␉␉␉break;␊ |
1075 | ␉␉default:␊ |
1076 | ␉␉␉return;␊ |
1077 | ␉}␊ |
1078 | ␉␊ |
1079 | ␉*location = (UInt32)newValue;␊ |
1080 | }␊ |
1081 | ␊ |
1082 | ␊ |
1083 | /*␊ |
1084 | * add_symbol␊ |
1085 | * This function adds a symbol from a module to the list of known symbols ␊ |
1086 | * possibly change to a pointer and add this to the Symbol module so that it can␊ |
1087 | * adjust it's internal symbol list (sort) to optimize locating new symbols␊ |
1088 | * NOTE: returns the address if the symbol is "start", else returns 0xFFFFFFFF␊ |
1089 | */␊ |
1090 | long long add_symbol(char* symbol, long long addr, char is64)␊ |
1091 | {␊ |
1092 | ␉if(is64) return 0xFFFFFFFF; // Fixme␊ |
1093 | ␊ |
1094 | ␉// This only can handle 32bit symbols ␊ |
1095 | ␉symbolList_t* entry;␊ |
1096 | ␉//DBG("Adding symbol %s at 0x%X\n", symbol, addr);␊ |
1097 | ␉␊ |
1098 | ␉if(!moduleSymbols)␊ |
1099 | ␉{␊ |
1100 | ␉␉moduleSymbols = entry = malloc(sizeof(symbolList_t));␊ |
1101 | ␊ |
1102 | ␉}␊ |
1103 | ␉else␊ |
1104 | ␉{␊ |
1105 | ␉␉entry = moduleSymbols;␊ |
1106 | ␉␉while(entry->next)␊ |
1107 | ␉␉{␊ |
1108 | ␉␉␉entry = entry->next;␊ |
1109 | ␉␉}␊ |
1110 | ␉␉␊ |
1111 | ␉␉entry->next = malloc(sizeof(symbolList_t));␊ |
1112 | ␉␉entry = entry->next;␊ |
1113 | ␉}␊ |
1114 | ␊ |
1115 | ␉entry->next = NULL;␊ |
1116 | ␉entry->addr = (UInt32)addr;␊ |
1117 | ␉entry->symbol = symbol;␊ |
1118 | ␉␊ |
1119 | ␉if(strcmp(symbol, "start") == 0)␊ |
1120 | ␉{␊ |
1121 | ␉␉return addr;␊ |
1122 | ␉}␊ |
1123 | ␉else␊ |
1124 | ␉{␊ |
1125 | ␉␉return 0xFFFFFFFF; // fixme␊ |
1126 | ␉}␊ |
1127 | }␊ |
1128 | ␊ |
1129 | ␊ |
1130 | /*␊ |
1131 | * print out the information about the loaded module␊ |
1132 | ␊ |
1133 | */␊ |
1134 | void module_loaded(const char* name/*, UInt32 version, UInt32 compat*/)␊ |
1135 | {␊ |
1136 | ␉// TODO: insert sorted␊ |
1137 | ␉moduleList_t* new_entry = malloc(sizeof(moduleList_t));␊ |
1138 | ␊ |
1139 | ␉new_entry->next = loadedModules;␊ |
1140 | ␉loadedModules = new_entry;␊ |
1141 | ␉␊ |
1142 | ␉new_entry->module = (char*)name;␊ |
1143 | ␉new_entry->version = 0; //version;␊ |
1144 | ␉new_entry->compat = 0; //compat;␊ |
1145 | }␊ |
1146 | ␊ |
1147 | int is_module_loaded(const char* name)␊ |
1148 | {␊ |
1149 | ␉// todo sorted search␊ |
1150 | ␉moduleList_t* entry = loadedModules;␊ |
1151 | ␉while(entry)␊ |
1152 | ␉{␊ |
1153 | ␉␉DBG("Comparing %s with %s\n", name, entry->module);␊ |
1154 | ␉␉if(strcmp(entry->module, name) == 0)␊ |
1155 | ␉␉{␊ |
1156 | ␉␉␉DBG("Located module %s\n", name);␊ |
1157 | ␉␉␉return 1;␊ |
1158 | ␉␉}␊ |
1159 | ␉␉else␊ |
1160 | ␉␉{␊ |
1161 | ␉␉␉entry = entry->next;␊ |
1162 | ␉␉}␊ |
1163 | ␊ |
1164 | ␉}␊ |
1165 | ␉DBG("Module %s not found\n", name);␊ |
1166 | ␊ |
1167 | ␉return 0;␊ |
1168 | }␊ |
1169 | ␊ |
1170 | // Look for symbols using the Smbols moduel function.␊ |
1171 | // If non are found, look through the list of module symbols␊ |
1172 | unsigned int lookup_all_symbols(const char* name)␊ |
1173 | {␊ |
1174 | ␉unsigned int addr = 0xFFFFFFFF;␊ |
1175 | ␉if(lookup_symbol && (UInt32)lookup_symbol != 0xFFFFFFFF)␊ |
1176 | ␉{␊ |
1177 | ␉␉addr = lookup_symbol(name);␊ |
1178 | ␉␉if(addr != 0xFFFFFFFF)␊ |
1179 | ␉␉{␊ |
1180 | ␉␉␉//DBG("Internal symbol %s located at 0x%X\n", name, addr);␊ |
1181 | ␉␉␉return addr;␊ |
1182 | ␉␉}␊ |
1183 | ␉}␊ |
1184 | ␊ |
1185 | ␉␊ |
1186 | ␉symbolList_t* entry = moduleSymbols;␊ |
1187 | ␉while(entry)␊ |
1188 | ␉{␊ |
1189 | ␉␉if(strcmp(entry->symbol, name) == 0)␊ |
1190 | ␉␉{␊ |
1191 | ␉␉␉//DBG("External symbol %s located at 0x%X\n", name, entry->addr);␊ |
1192 | ␉␉␉return entry->addr;␊ |
1193 | ␉␉}␊ |
1194 | ␉␉else␊ |
1195 | ␉␉{␊ |
1196 | ␉␉␉entry = entry->next;␊ |
1197 | ␉␉}␊ |
1198 | ␊ |
1199 | ␉}␊ |
1200 | #if DEBUG_MODULES␊ |
1201 | //␉if(strcmp(name, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
1202 | //␉{␊ |
1203 | ␉␉verbose("Unable to locate symbol %s\n", name);␊ |
1204 | ␉␉getc();␊ |
1205 | //␉}␊ |
1206 | #endif␊ |
1207 | ␉return 0xFFFFFFFF;␊ |
1208 | }␊ |
1209 | ␊ |
1210 | ␊ |
1211 | /*␊ |
1212 | * parse the symbol table␊ |
1213 | * Lookup any undefined symbols␊ |
1214 | */␊ |
1215 | ␊ |
1216 | unsigned int handle_symtable(UInt32 base, struct symtab_command* symtabCommand, long long(*symbol_handler)(char*, long long, char), char is64)␊ |
1217 | {␊ |
1218 | ␉// TODO: verify that the _TEXT,_text segment starts at the same locaiton in the file. If not␊ |
1219 | ␉//␉␉␉subtract the vmaddress and add the actual file address back on. (NOTE: if compiled properly, not needed)␊ |
1220 | ␉␊ |
1221 | ␉unsigned int module_start = 0xFFFFFFFF;␊ |
1222 | ␉␊ |
1223 | ␉UInt32 symbolIndex = 0;␊ |
1224 | ␉char* symbolString = base + (char*)symtabCommand->stroff;␊ |
1225 | ␉//char* symbolTable = base + symtabCommand->symoff;␊ |
1226 | ␉if(!is64)␊ |
1227 | ␉{␊ |
1228 | ␉␉struct nlist* symbolEntry = (void*)base + symtabCommand->symoff;␊ |
1229 | ␉␉while(symbolIndex < symtabCommand->nsyms)␊ |
1230 | ␉␉{␊ |
1231 | ␉␉␉// If the symbol is exported by this module␊ |
1232 | ␉␉␉if(symbolEntry->n_value &&␊ |
1233 | ␉␉␉ symbol_handler(symbolString + symbolEntry->n_un.n_strx, (long long)base + symbolEntry->n_value, is64) != 0xFFFFFFFF)␊ |
1234 | ␉␉␉{␊ |
1235 | ␉␉␉␉␊ |
1236 | ␉␉␉␉// Module start located. Start is an alias so don't register it␊ |
1237 | ␉␉␉␉module_start = base + symbolEntry->n_value;␊ |
1238 | ␉␉␉}␊ |
1239 | ␉␉␉␊ |
1240 | ␉␉␉symbolEntry++;␊ |
1241 | ␉␉␉symbolIndex++;␉// TODO remove␊ |
1242 | ␉␉}␊ |
1243 | ␉}␊ |
1244 | ␉else␊ |
1245 | ␉{␊ |
1246 | ␉␉struct nlist_64* symbolEntry = (void*)base + symtabCommand->symoff;␊ |
1247 | ␉␉// NOTE First entry is *not* correct, but we can ignore it (i'm getting radar:// right now)␉␊ |
1248 | ␉␉while(symbolIndex < symtabCommand->nsyms)␊ |
1249 | ␉␉{␊ |
1250 | ␉␉␉␊ |
1251 | ␉␉␉␊ |
1252 | ␉␉␉// If the symbol is exported by this module␊ |
1253 | ␉␉␉if(symbolEntry->n_value &&␊ |
1254 | ␉␉␉ symbol_handler(symbolString + symbolEntry->n_un.n_strx, (long long)base + symbolEntry->n_value, is64) != 0xFFFFFFFF)␊ |
1255 | ␉␉␉{␊ |
1256 | ␉␉␉␉␊ |
1257 | ␉␉␉␉// Module start located. Start is an alias so don't register it␊ |
1258 | ␉␉␉␉module_start = base + symbolEntry->n_value;␊ |
1259 | ␉␉␉}␊ |
1260 | ␉␉␉␊ |
1261 | ␉␉␉symbolEntry++;␊ |
1262 | ␉␉␉symbolIndex++;␉// TODO remove␊ |
1263 | ␉␉}␊ |
1264 | ␉}␊ |
1265 | ␉␉␊ |
1266 | ␉return module_start;␊ |
1267 | ␉␊ |
1268 | }␊ |
1269 | ␊ |
1270 | ␊ |
1271 | /*␊ |
1272 | * Locate the symbol for an already loaded function and modify the beginning of␊ |
1273 | * the function to jump directly to the new one␊ |
1274 | * example: replace_function("_HelloWorld_start", &replacement_start);␊ |
1275 | */␊ |
1276 | int replace_function(const char* symbol, void* newAddress)␊ |
1277 | {␊ |
1278 | ␉UInt32* jumpPointer = malloc(sizeof(UInt32*));␉ ␊ |
1279 | ␉// TODO: look into using the next four bytes of the function instead␊ |
1280 | ␉// Most functions should support this, as they probably will be at ␊ |
1281 | ␉// least 10 bytes long, but you never know, this is sligtly safer as␊ |
1282 | ␉// function can be as small as 6 bytes.␊ |
1283 | ␉UInt32 addr = lookup_all_symbols(symbol);␊ |
1284 | ␉␊ |
1285 | ␉char* binary = (char*)addr;␊ |
1286 | ␉if(addr != 0xFFFFFFFF)␊ |
1287 | ␉{␊ |
1288 | ␉␉DBG("Replacing %s to point to 0x%x\n", symbol, newAddress);␊ |
1289 | ␉␉*binary++ = 0xFF;␉// Jump␊ |
1290 | ␉␉*binary++ = 0x25;␉// Long Jump␊ |
1291 | ␉␉*((UInt32*)binary) = (UInt32)jumpPointer;␊ |
1292 | ␉␉␊ |
1293 | ␉␉*jumpPointer = (UInt32)newAddress;␊ |
1294 | ␉␉␊ |
1295 | ␉␉return 1;␊ |
1296 | ␉}␊ |
1297 | ␉else ␊ |
1298 | ␉{␊ |
1299 | ␉␉return 0;␊ |
1300 | ␉}␊ |
1301 | ␊ |
1302 | }␊ |
1303 | ␊ |
1304 | void dyld_stub_binder()␊ |
1305 | {␊ |
1306 | ␉// TODO: actualy impliment this function (asm)␊ |
1307 | ␉stop("ERROR: dyld_stub_binder was called, should have been take care of by the linker.\n");␊ |
1308 | }␊ |
1309 | ␊ |
1310 | /* Nedded to divide 64bit numbers correctly. TODO: look into why modules need this␊ |
1311 | * And why it isn't needed when compiled into boot2␊ |
1312 | */␊ |
1313 | ␊ |
1314 | uint64_t __udivdi3(uint64_t numerator, uint64_t denominator)␊ |
1315 | {␊ |
1316 | ␉uint64_t quotient = 0, qbit = 1;␊ |
1317 | ␉␊ |
1318 | ␉if (denominator)␊ |
1319 | ␉{␊ |
1320 | ␉␉while ((int64_t) denominator >= 0)␊ |
1321 | ␉␉{␊ |
1322 | ␉␉␉denominator <<= 1;␊ |
1323 | ␉␉␉qbit <<= 1;␊ |
1324 | ␉␉}␊ |
1325 | ␉␉␊ |
1326 | ␉␉while (denominator)␊ |
1327 | ␉␉{␊ |
1328 | ␉␉␉if (denominator <= numerator)␊ |
1329 | ␉␉␉{␊ |
1330 | ␉␉␉␉numerator -= denominator;␊ |
1331 | ␉␉␉␉quotient += qbit;␊ |
1332 | ␉␉␉}␊ |
1333 | ␉␉␉denominator >>= 1;␊ |
1334 | ␉␉␉qbit >>= 1;␊ |
1335 | ␉␉}␊ |
1336 | ␉␉␊ |
1337 | ␉␉return quotient;␊ |
1338 | ␉}␊ |
1339 | ␉else {␊ |
1340 | ␉␉stop("Divide by 0");␊ |
1341 | ␉␉return 0;␊ |
1342 | ␉}␊ |
1343 | ␉␊ |
1344 | }␊ |
1345 | |