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)␊ |
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*, int(*strcmp_callback)(const char*, const char*)) = NULL;␊ |
29 | ␊ |
30 | #if DEBUG_MODULES␊ |
31 | VOID print_hook_list()␊ |
32 | {␊ |
33 | ␉moduleHook_t* hooks = moduleCallbacks;␊ |
34 | ␉printf("Hook list: \n");␊ |
35 | ␉while(hooks)␊ |
36 | ␉{␊ |
37 | ␉␉printf("* %s\n", hooks->name);␊ |
38 | ␉␉hooks = hooks->next;␊ |
39 | ␉}␊ |
40 | ␉printf("\n");␊ |
41 | }␊ |
42 | ␊ |
43 | VOID print_symbol_list()␊ |
44 | {␊ |
45 | ␉symbolList_t* symbol = moduleSymbols;␊ |
46 | ␉printf("Symbol list: \n");␊ |
47 | ␉while(symbol)␊ |
48 | ␉{␊ |
49 | ␉␉printf("* %s\n", symbol->symbol);␊ |
50 | ␉␉symbol = symbol->next;␊ |
51 | ␉}␊ |
52 | ␉printf("\n");␊ |
53 | }␊ |
54 | #endif␊ |
55 | ␊ |
56 | ␊ |
57 | /*␊ |
58 | * Initialize the module system by loading the Symbols.dylib module.␊ |
59 | * Once loaded, locate the _lookup_symbol function so that internal␊ |
60 | * symbols can be resolved.␊ |
61 | */␊ |
62 | EFI_STATUS init_module_system()␊ |
63 | {␊ |
64 | ␉msglog("* Attempting to load system module\n");␊ |
65 | ␉␊ |
66 | ␉// Intialize module system␊ |
67 | EFI_STATUS status = load_module(SYMBOLS_MODULE);␊ |
68 | ␉if((status == EFI_SUCCESS) || (status == EFI_ALREADY_STARTED)/*should never happen*/ ) ␊ |
69 | ␉{␊ |
70 | ␉␉lookup_symbol = (void*)lookup_all_symbols(SYMBOL_LOOKUP_SYMBOL);␊ |
71 | ␉␉␊ |
72 | ␉␉if((UInt32)lookup_symbol != 0xFFFFFFFF)␊ |
73 | ␉␉{␊ |
74 | ␉␉␉return EFI_SUCCESS;␊ |
75 | ␉␉}␊ |
76 | ␉␉␊ |
77 | ␉}␊ |
78 | ␉␊ |
79 | ␉return EFI_LOAD_ERROR;␊ |
80 | }␊ |
81 | ␊ |
82 | ␊ |
83 | /*␊ |
84 | * Load all modules in the /Extra/modules/ directory␊ |
85 | * Module depencdies will be loaded first␊ |
86 | * MOdules will only be loaded once. When loaded a module must␊ |
87 | * setup apropriete function calls and hooks as required.␊ |
88 | * NOTE: To ensure a module loads after another you may ␊ |
89 | * link one module with the other. For dyld to allow this, you must␊ |
90 | * reference at least one symbol within the module.␊ |
91 | */␊ |
92 | ␊ |
93 | VOID load_all_modules()␊ |
94 | {␊ |
95 | ␉char* name;␊ |
96 | ␉long flags;␊ |
97 | ␉long time;␊ |
98 | ␉struct dirstuff* moduleDir = opendir("/Extra/modules/");␊ |
99 | ␉while(readdir(moduleDir, (const char**)&name, &flags, &time) >= 0)␊ |
100 | ␉{␊ |
101 | ␉␉if ((strcmp(SYMBOLS_MODULE,name)) == 0) continue; // if we found Symbols.dylib, just skip it␊ |
102 | ␉␉␊ |
103 | ␉␉int len = strlen(name);␊ |
104 | ␉␉int ext_size = sizeof("dylib");␊ |
105 | ␉␉␊ |
106 | ␉␉if (len >= ext_size)␊ |
107 | ␉␉{␊ |
108 | ␉␉␉if(strcmp(&name[len - ext_size], ".dylib") == 0)␊ |
109 | ␉␉␉{␉␉␉␉␊ |
110 | ␉␉␉␉char *tmp = newString(name);␉␉␉␉␉␉␉␉␊ |
111 | ␉␉␉␉if (!tmp) {␊ |
112 | ␉␉␉␉␉continue;␊ |
113 | ␉␉␉␉}␊ |
114 | ␉␉␉␉msglog("* Attempting to load module: %s\n", tmp);␉␉␉␊ |
115 | ␉␉␉␉if(load_module(tmp) != EFI_SUCCESS)␊ |
116 | ␉␉␉␉{␊ |
117 | ␉␉␉␉␉// failed to load or already loaded␊ |
118 | ␉␉␉␉␉free(tmp);␊ |
119 | ␉␉␉␉}␊ |
120 | ␉␉␉}␊ |
121 | #if DEBUG_MODULES␊ |
122 | ␉␉␉else ␊ |
123 | ␉␉␉{␊ |
124 | ␉␉␉␉DBG("Ignoring %s\n", name);␊ |
125 | ␉␉␉}␊ |
126 | #endif␊ |
127 | ␉␉}␉␉␊ |
128 | #if DEBUG_MODULES␊ |
129 | ␉␉else ␊ |
130 | ␉␉{␊ |
131 | ␉␉␉DBG("Ignoring %s\n", name);␊ |
132 | ␉␉}␊ |
133 | #endif␊ |
134 | ␉␉␊ |
135 | ␉}␊ |
136 | ␉␊ |
137 | ␉if (moduleDir)␊ |
138 | ␉{␊ |
139 | ␉␉closedir(moduleDir);␊ |
140 | ␉␉␊ |
141 | ␉}␊ |
142 | ␉␊ |
143 | #if DEBUG_MODULES␊ |
144 | ␉print_symbol_list();␊ |
145 | #endif␊ |
146 | }␊ |
147 | ␊ |
148 | /*␊ |
149 | * Load a module file in /Extra/modules␊ |
150 | * TODO: verify version number of module␊ |
151 | */␊ |
152 | EFI_STATUS load_module(char* module)␊ |
153 | {␊ |
154 | ␉void (*module_start)(void) = NULL;␊ |
155 | ␉␊ |
156 | ␉␊ |
157 | ␉// Check to see if the module has already been loaded␊ |
158 | ␉if(is_module_loaded(module) == EFI_SUCCESS)␊ |
159 | ␉{␊ |
160 | ␉␉msglog("Module %s already registred\n", module);␊ |
161 | ␉␉return EFI_ALREADY_STARTED;␊ |
162 | ␉}␊ |
163 | ␉␊ |
164 | ␉int fh = -1;␊ |
165 | ␉char *modString=NULL;␊ |
166 | ␉modString = newStringWithFormat( "/Extra/modules/%s", module);␊ |
167 | ␉if (!modString) {␊ |
168 | ␉␉printf("Unable to allocate module name : /Extra/modules/%s\n", module);␊ |
169 | ␉␉return EFI_OUT_OF_RESOURCES;␊ |
170 | ␉}␊ |
171 | ␉fh = open(modString);␊ |
172 | ␉if(fh < 0)␊ |
173 | ␉{␉␉␊ |
174 | #if DEBUG_MODULES␊ |
175 | ␉␉DBG("Unable to locate module %s\n", modString);␊ |
176 | ␉␉getc();␊ |
177 | #else␊ |
178 | ␉␉msglog("Unable to locate module %s\n", modString);␊ |
179 | #endif␊ |
180 | ␉␉free(modString);␊ |
181 | ␉␉return EFI_OUT_OF_RESOURCES;␉␉␊ |
182 | ␉}␊ |
183 | ␉EFI_STATUS ret = EFI_SUCCESS;␊ |
184 | ␉␊ |
185 | ␉{␊ |
186 | ␉␉int moduleSize = file_size(fh);␊ |
187 | ␉␉␊ |
188 | ␉␉char* module_base = NULL;␊ |
189 | ␉␉␊ |
190 | ␉␉if (moduleSize > 0)␊ |
191 | ␉␉{␊ |
192 | ␉␉␉module_base = (char*) malloc(moduleSize);␊ |
193 | ␉␉}␉␉␊ |
194 | ␉␉␊ |
195 | ␉␉if (module_base && read(fh, module_base, moduleSize) == moduleSize)␊ |
196 | ␉␉{␊ |
197 | ␉␉␉␊ |
198 | ␉␉␉DBG("Module %s read in.\n", modString);␊ |
199 | ␉␉␉␊ |
200 | ␉␉␉// Module loaded into memory, parse it␊ |
201 | ␉␉␉module_start = parse_mach(module_base, &load_module, &add_symbol);␊ |
202 | ␉␉␉␊ |
203 | ␉␉␉if(module_start && (module_start != (void*)0xFFFFFFFF))␊ |
204 | ␉␉␉{␊ |
205 | ␉␉␉␉module_loaded(module/*moduleName, moduleVersion, moduleCompat*/);␊ |
206 | ␉␉␉␉// Notify the system that it was laoded␊ |
207 | ␉␉␉␉(*module_start)();␉// Start the module␊ |
208 | ␉␉␉␉msglog("%s successfully Loaded.\n", module);␊ |
209 | ␉␉␉}␊ |
210 | ␉␉␉else␊ |
211 | ␉␉␉{␊ |
212 | ␉␉␉␉// The module does not have a valid start function␊ |
213 | ␉␉␉␉printf("Unable to start %s\n", module);␉␊ |
214 | ␉␉␉␉ret = EFI_NOT_STARTED;␊ |
215 | #if DEBUG_MODULES␉␉␉␊ |
216 | ␉␉␉␉getc();␊ |
217 | #endif␊ |
218 | ␉␉␉}␉␉␊ |
219 | ␉␉}␊ |
220 | ␉␉else␊ |
221 | ␉␉{␊ |
222 | ␉␉␉printf("Unable to read in module %s\n.", module);␊ |
223 | #if DEBUG_MODULES␉␉␊ |
224 | ␉␉␉getc();␊ |
225 | #endif␊ |
226 | ␉␉␉ret = EFI_LOAD_ERROR;␊ |
227 | ␉␉}␊ |
228 | ␉}␊ |
229 | ␉close(fh);␊ |
230 | ␉free(modString);␊ |
231 | ␉return ret;␊ |
232 | }␊ |
233 | ␊ |
234 | moduleHook_t* get_callback(const char* name)␊ |
235 | {␊ |
236 | ␉moduleHook_t* hooks = moduleCallbacks;␊ |
237 | ␉␊ |
238 | ␉// look for a hook. If it exists, return the moduleHook_t*,␊ |
239 | ␉// If not, return NULL.␊ |
240 | ␉while(hooks)␊ |
241 | ␉{␊ |
242 | ␉␉if(strcmp(name, hooks->name) == 0)␊ |
243 | ␉␉{␊ |
244 | ␉␉␉//DBG("Located hook %s\n", name);␊ |
245 | ␉␉␉return hooks;␊ |
246 | ␉␉}␊ |
247 | ␉␉hooks = hooks->next;␊ |
248 | ␉}␊ |
249 | ␉return NULL;␊ |
250 | ␉␊ |
251 | }␊ |
252 | ␊ |
253 | /*␊ |
254 | *␉execute_hook( const char* name )␊ |
255 | *␉␉name - Name of the module hook␊ |
256 | *␉␉␉If any callbacks have been registered for this hook␊ |
257 | *␉␉␉they will be executed now in the same order that the␊ |
258 | *␉␉␉hooks were added.␊ |
259 | */␊ |
260 | EFI_STATUS execute_hook(const char* name, void* arg1, void* arg2, void* arg3, void* arg4, void* arg5, void* arg6)␊ |
261 | {␊ |
262 | ␉DBG("Attempting to execute hook '%s'\n", name);␊ |
263 | ␉moduleHook_t* hook = get_callback(name);␊ |
264 | ␉␊ |
265 | ␉if(hook)␊ |
266 | ␉{␊ |
267 | ␉␉// Loop through all callbacks for this module␊ |
268 | ␉␉callbackList_t* callbacks = hook->callbacks;␊ |
269 | ␉␉␊ |
270 | ␉␉while(callbacks)␊ |
271 | ␉␉{␊ |
272 | ␉␉␉// Execute callback␊ |
273 | ␉␉␉callbacks->callback(arg1, arg2, arg3, arg4, arg5, arg6);␊ |
274 | ␉␉␉callbacks = callbacks->next;␊ |
275 | ␉␉}␊ |
276 | ␉␉DBG("Hook '%s' executed.\n", name); ␊ |
277 | ␉␉return EFI_SUCCESS;␊ |
278 | ␉}␊ |
279 | ␉␊ |
280 | ␉// Callback for this hook doesn't exist;␊ |
281 | ␉DBG("No callbacks for '%s' hook.\n", name);␊ |
282 | ␉return EFI_NOT_FOUND;␊ |
283 | ␉␊ |
284 | }␊ |
285 | ␊ |
286 | /*␊ |
287 | *␉register_hook_callback( const char* name, void(*callback)())␊ |
288 | *␉␉name - Name of the module hook to attach to.␊ |
289 | *␉␉callbacks - The funciton pointer that will be called when the␊ |
290 | *␉␉␉hook is executed. When registering a new callback name, the callback is added sorted.␊ |
291 | *␉␉␉NOTE: the hooks take four void* arguments.␊ |
292 | */␊ |
293 | VOID register_hook_callback(const char* name, void(*callback)(void*, void*, void*, void*, void*, void*))␊ |
294 | {␉␊ |
295 | ␉DBG("Adding callback for hook '%s'.\n", name);␊ |
296 | ␉␊ |
297 | ␉moduleHook_t* hook = get_callback(name);␊ |
298 | ␉␊ |
299 | ␉if(hook)␊ |
300 | ␉{␊ |
301 | ␉␉// append␊ |
302 | ␉␉callbackList_t* newCallback = malloc(sizeof(callbackList_t));␊ |
303 | ␉␉if (!newCallback) {␊ |
304 | ␉␉␉DBG("Unable to allocate memory for callback \n");␊ |
305 | ␉␉␉return;␊ |
306 | ␉␉}␊ |
307 | ␉␉newCallback->next = hook->callbacks;␊ |
308 | ␉␉hook->callbacks = newCallback;␊ |
309 | ␉␉newCallback->callback = callback;␊ |
310 | ␉}␊ |
311 | ␉else␊ |
312 | ␉{␊ |
313 | ␉␉// create new hook␊ |
314 | ␉␉moduleHook_t* newHook = malloc(sizeof(moduleHook_t));␊ |
315 | ␉␉if (!newHook) {␊ |
316 | ␉␉␉DBG("Unable to allocate memory for hook '%s'.\n", name);␊ |
317 | ␉␉␉return;␊ |
318 | ␉␉}␊ |
319 | ␉␉newHook->name = name;␊ |
320 | ␉␉newHook->callbacks = malloc(sizeof(callbackList_t));␊ |
321 | ␉␉if (!newHook->callbacks) {␊ |
322 | ␉␉␉DBG("Unable to allocate memory for callback \n");␊ |
323 | ␉␉␉free(newHook);␊ |
324 | ␉␉␉return;␊ |
325 | ␉␉}␊ |
326 | ␉␉newHook->callbacks->callback = callback;␊ |
327 | ␉␉newHook->callbacks->next = NULL;␊ |
328 | ␉␉␊ |
329 | ␉␉newHook->next = moduleCallbacks;␊ |
330 | ␉␉moduleCallbacks = newHook;␊ |
331 | ␉␉␊ |
332 | ␉}␊ |
333 | ␉␊ |
334 | #if DEBUG_MODULES␊ |
335 | ␉print_hook_list();␊ |
336 | ␉getc();␊ |
337 | #endif␊ |
338 | ␉␊ |
339 | }␊ |
340 | ␊ |
341 | #if DEBUG_MODULES␊ |
342 | unsigned long vmaddr;␊ |
343 | long vmsize;␊ |
344 | #endif␊ |
345 | ␊ |
346 | /*␊ |
347 | * Parse through a macho module. The module will be rebased and binded␊ |
348 | * as specified in the macho header. If the module is successfully loaded␊ |
349 | * the module iinit address will be returned.␊ |
350 | * NOTE; all dependecies will be loaded before this module is started␊ |
351 | * NOTE: If the module is unable to load ot completeion, the modules␊ |
352 | * symbols will still be available (TODO: fix this). This should not␊ |
353 | * happen as all dependencies are verified before the sybols are read in.␊ |
354 | */␊ |
355 | void* parse_mach(void* binary, EFI_STATUS(*dylib_loader)(char*), long long(*symbol_handler)(char*, long long, char))␉// TODO: add param to specify valid archs␊ |
356 | {␉␊ |
357 | ␉char is64 = false;␊ |
358 | ␉void (*module_start)(void) = NULL;␊ |
359 | ␉␊ |
360 | ␉// Module info␊ |
361 | ␉/*char* moduleName = NULL;␊ |
362 | ␉ UInt32 moduleVersion = 0;␊ |
363 | ␉ UInt32 moduleCompat = 0;␊ |
364 | ␉ */␊ |
365 | ␉␊ |
366 | ␉// TODO convert all of the structs to a union␉␊ |
367 | ␉struct dyld_info_command* dyldInfoCommand = NULL;␉␊ |
368 | ␉struct symtab_command* symtabCommand = NULL;␉␊ |
369 | ␉␊ |
370 | ␉{␊ |
371 | ␉␉struct segment_command *segCommand = NULL;␊ |
372 | ␉␉struct segment_command_64 *segCommand64 = NULL;␊ |
373 | ␉␉struct dylib_command* dylibCommand = NULL;␊ |
374 | ␉␉struct load_command *loadCommand = NULL;␊ |
375 | ␉␉UInt32 binaryIndex = 0;␊ |
376 | ␉␉UInt16 cmd = 0;␊ |
377 | ␉␉␊ |
378 | ␉␉// Parse through the load commands␊ |
379 | ␉␉if(((struct mach_header*)binary)->magic == MH_MAGIC)␊ |
380 | ␉␉{␊ |
381 | ␉␉␉is64 = false;␊ |
382 | ␉␉␉binaryIndex += sizeof(struct mach_header);␊ |
383 | ␉␉}␊ |
384 | ␉␉else if(((struct mach_header_64*)binary)->magic == MH_MAGIC_64)␊ |
385 | ␉␉{␊ |
386 | ␉␉␉// NOTE: modules cannot be 64bit...␊ |
387 | ␉␉␉is64 = true;␊ |
388 | ␉␉␉binaryIndex += sizeof(struct mach_header_64);␊ |
389 | ␉␉}␊ |
390 | ␉␉else␊ |
391 | ␉␉{␊ |
392 | ␉␉␉printf("Modules: Invalid mach magic\n");␊ |
393 | ␉␉␉getc();␊ |
394 | ␉␉␉return NULL;␊ |
395 | ␉␉}␊ |
396 | ␉␉␊ |
397 | ␉␉␊ |
398 | ␉␉␊ |
399 | ␉␉/*if(((struct mach_header*)binary)->filetype != MH_DYLIB)␊ |
400 | ␉␉ {␊ |
401 | ␉␉ printf("Module is not a dylib. Unable to load.\n");␊ |
402 | ␉␉ getc();␊ |
403 | ␉␉ return NULL; // Module is in the incorrect format␊ |
404 | ␉␉ }*/␊ |
405 | ␉␉␊ |
406 | ␉␉while(cmd < ((struct mach_header*)binary)->ncmds)␊ |
407 | ␉␉{␊ |
408 | ␉␉␉cmd++;␊ |
409 | ␉␉␉␊ |
410 | ␉␉␉loadCommand = binary + binaryIndex;␊ |
411 | ␉␉␉UInt32 cmdSize = loadCommand->cmdsize;␊ |
412 | ␉␉␉␊ |
413 | ␉␉␉␊ |
414 | ␉␉␉switch ((loadCommand->cmd & 0x7FFFFFFF))␊ |
415 | ␉␉␉{␊ |
416 | ␉␉␉␉case LC_SYMTAB:␊ |
417 | ␉␉␉␉␉symtabCommand = binary + binaryIndex;␊ |
418 | ␉␉␉␉␉break;␊ |
419 | ␉␉␉␉␉␊ |
420 | ␉␉␉␉case LC_SEGMENT: // 32bit macho␊ |
421 | ␉␉␉␉{␊ |
422 | ␉␉␉␉␉segCommand = binary + binaryIndex;␊ |
423 | ␉␉␉␉␉␊ |
424 | ␉␉␉␉␉//printf("Segment name is %s\n", segCommand->segname);␊ |
425 | ␉␉␉␉␉␊ |
426 | ␉␉␉␉␉if(strcmp("__TEXT", segCommand->segname) == 0)␊ |
427 | ␉␉␉␉␉{␊ |
428 | ␉␉␉␉␉␉UInt32 sectionIndex;␊ |
429 | ␉␉␉␉␉␉␊ |
430 | #if DEBUG_MODULES␊ |
431 | ␉␉␉␉␉␉unsigned long fileaddr;␊ |
432 | ␉␉␉␉␉␉long filesize;␉␉␉␉␉␊ |
433 | ␉␉␉␉␉␉vmaddr = (segCommand->vmaddr & 0x3fffffff);␊ |
434 | ␉␉␉␉␉␉vmsize = segCommand->vmsize;␉ ␊ |
435 | ␉␉␉␉␉␉fileaddr = ((unsigned long)(binary + binaryIndex) + segCommand->fileoff);␊ |
436 | ␉␉␉␉␉␉filesize = segCommand->filesize;␊ |
437 | ␉␉␉␉␉␉␊ |
438 | ␉␉␉␉␉␉printf("segname: %s, vmaddr: %x, vmsize: %x, fileoff: %x, filesize: %x, nsects: %d, flags: %x.\n",␊ |
439 | ␉␉␉␉␉␉␉ segCommand->segname, (unsigned)vmaddr, (unsigned)vmsize, (unsigned)fileaddr, (unsigned)filesize,␊ |
440 | ␉␉␉␉␉␉␉ (unsigned) segCommand->nsects, (unsigned)segCommand->flags);␊ |
441 | #if DEBUG_MODULES==2␊ |
442 | ␉␉␉␉␉␉␊ |
443 | ␉␉␉␉␉␉getc();␊ |
444 | #endif␊ |
445 | #endif␊ |
446 | ␉␉␉␉␉␉␊ |
447 | ␉␉␉␉␉␉sectionIndex = sizeof(struct segment_command);␊ |
448 | ␉␉␉␉␉␉␊ |
449 | ␉␉␉␉␉␉struct section *sect;␊ |
450 | ␉␉␉␉␉␉␊ |
451 | ␉␉␉␉␉␉while(sectionIndex < segCommand->cmdsize)␊ |
452 | ␉␉␉␉␉␉{␊ |
453 | ␉␉␉␉␉␉␉sect = binary + binaryIndex + sectionIndex;␊ |
454 | ␉␉␉␉␉␉␉␊ |
455 | ␉␉␉␉␉␉␉sectionIndex += sizeof(struct section);␊ |
456 | ␉␉␉␉␉␉␉␊ |
457 | ␉␉␉␉␉␉␉␊ |
458 | ␉␉␉␉␉␉␉if(strcmp("__text", sect->sectname) == 0)␊ |
459 | ␉␉␉␉␉␉␉{␊ |
460 | ␉␉␉␉␉␉␉␉// __TEXT,__text found, save the offset and address for when looking for the calls.␊ |
461 | ␉␉␉␉␉␉␉␉textSection = sect->offset;␊ |
462 | ␉␉␉␉␉␉␉␉textAddress = sect->addr;␊ |
463 | ␉␉␉␉␉␉␉␉break;␊ |
464 | ␉␉␉␉␉␉␉}␉␉␉␉␉␊ |
465 | ␉␉␉␉␉␉}␊ |
466 | ␉␉␉␉␉}␊ |
467 | ␉␉␉␉␉break;␊ |
468 | ␉␉␉␉}␉␉␉␉␊ |
469 | ␉␉␉␉case LC_SEGMENT_64:␉// 64bit macho's␊ |
470 | ␉␉␉␉{␊ |
471 | ␉␉␉␉␉segCommand64 = binary + binaryIndex;␊ |
472 | ␉␉␉␉␉␊ |
473 | ␉␉␉␉␉//printf("Segment name is %s\n", segCommand->segname);␊ |
474 | ␉␉␉␉␉␊ |
475 | ␉␉␉␉␉if(strcmp("__TEXT", segCommand64->segname) == 0)␊ |
476 | ␉␉␉␉␉{␊ |
477 | ␉␉␉␉␉␉UInt32 sectionIndex;␊ |
478 | ␉␉␉␉␉␉␊ |
479 | #if DEBUG_MODULES␉␉␉␉␉␉␊ |
480 | ␉␉␉␉␉␉unsigned long fileaddr;␊ |
481 | ␉␉␉␉␉␉long filesize;␉␉␉␉␉␊ |
482 | ␉␉␉␉␉␉vmaddr = (segCommand64->vmaddr & 0x3fffffff);␊ |
483 | ␉␉␉␉␉␉vmsize = segCommand64->vmsize;␉ ␊ |
484 | ␉␉␉␉␉␉fileaddr = ((unsigned long)(binary + binaryIndex) + segCommand64->fileoff);␊ |
485 | ␉␉␉␉␉␉filesize = segCommand64->filesize;␊ |
486 | ␉␉␉␉␉␉␊ |
487 | ␉␉␉␉␉␉printf("segname: %s, vmaddr: %x, vmsize: %x, fileoff: %x, filesize: %x, nsects: %d, flags: %x.\n",␊ |
488 | ␉␉␉␉␉␉␉ segCommand64->segname, (unsigned)vmaddr, (unsigned)vmsize, (unsigned)fileaddr, (unsigned)filesize,␊ |
489 | ␉␉␉␉␉␉␉ (unsigned) segCommand64->nsects, (unsigned)segCommand64->flags);␊ |
490 | #if DEBUG_MODULES==2␊ |
491 | ␉␉␉␉␉␉␊ |
492 | ␉␉␉␉␉␉getc();␊ |
493 | #endif␊ |
494 | #endif␊ |
495 | ␉␉␉␉␉␉␊ |
496 | ␉␉␉␉␉␉sectionIndex = sizeof(struct segment_command_64);␊ |
497 | ␉␉␉␉␉␉␊ |
498 | ␉␉␉␉␉␉struct section_64 *sect;␊ |
499 | ␉␉␉␉␉␉␊ |
500 | ␉␉␉␉␉␉while(sectionIndex < segCommand64->cmdsize)␊ |
501 | ␉␉␉␉␉␉{␊ |
502 | ␉␉␉␉␉␉␉sect = binary + binaryIndex + sectionIndex;␊ |
503 | ␉␉␉␉␉␉␉␊ |
504 | ␉␉␉␉␉␉␉sectionIndex += sizeof(struct section_64);␊ |
505 | ␉␉␉␉␉␉␉␊ |
506 | ␉␉␉␉␉␉␉␊ |
507 | ␉␉␉␉␉␉␉if(strcmp("__text", sect->sectname) == 0)␊ |
508 | ␉␉␉␉␉␉␉{␊ |
509 | ␉␉␉␉␉␉␉␉// __TEXT,__text found, save the offset and address for when looking for the calls.␊ |
510 | ␉␉␉␉␉␉␉␉textSection = sect->offset;␊ |
511 | ␉␉␉␉␉␉␉␉textAddress = sect->addr;␊ |
512 | ␉␉␉␉␉␉␉␉␊ |
513 | ␉␉␉␉␉␉␉␉break;␊ |
514 | ␉␉␉␉␉␉␉}␉␉␉␉␉␊ |
515 | ␉␉␉␉␉␉}␊ |
516 | ␉␉␉␉␉}␊ |
517 | ␉␉␉␉␉␊ |
518 | ␉␉␉␉␉break;␊ |
519 | ␉␉␉␉}␉␉␉␉␊ |
520 | ␉␉␉␉case LC_DYSYMTAB:␊ |
521 | ␉␉␉␉␉break;␊ |
522 | ␉␉␉␉␉␊ |
523 | ␉␉␉␉case LC_LOAD_DYLIB:␊ |
524 | ␉␉␉␉case LC_LOAD_WEAK_DYLIB ^ LC_REQ_DYLD:␊ |
525 | ␉␉␉␉{␊ |
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 | ␉␉␉␉␉␊ |
532 | ␉␉␉␉␉char *name=NULL;␊ |
533 | ␉␉␉␉␉name = newStringWithFormat( "%s.dylib", module);␊ |
534 | ␉␉␉␉␉if (!name) {␊ |
535 | ␉␉␉␉␉␉printf("Unable to allocate module name : %s\n", module);␊ |
536 | ␉␉␉␉␉␉return NULL;␊ |
537 | ␉␉␉␉␉}␊ |
538 | ␉␉␉␉␉if(dylib_loader)␊ |
539 | ␉␉␉␉␉{␊ |
540 | ␉␉␉␉␉␉EFI_STATUS statue = dylib_loader(name);␊ |
541 | ␉␉␉␉␉␉␊ |
542 | ␉␉␉␉␉␉if( statue != EFI_SUCCESS)␊ |
543 | ␉␉␉␉␉␉{␊ |
544 | ␉␉␉␉␉␉␉if (statue != EFI_ALREADY_STARTED)␊ |
545 | ␉␉␉␉␉␉␉{␊ |
546 | ␉␉␉␉␉␉␉␉// Unable to load dependancy␊ |
547 | ␉␉␉␉␉␉␉␉free(name);␊ |
548 | ␉␉␉␉␉␉␉␉return NULL;␊ |
549 | ␉␉␉␉␉␉␉}␊ |
550 | ␉␉␉␉␉␉␉␊ |
551 | ␉␉␉␉␉␉} ␊ |
552 | ␉␉␉␉␉␉␊ |
553 | ␉␉␉␉␉}␊ |
554 | ␉␉␉␉␉free(name);␊ |
555 | ␉␉␉␉␉␊ |
556 | ␉␉␉␉␉break;␊ |
557 | ␉␉␉␉}␉␉␉␉␊ |
558 | ␉␉␉␉case LC_ID_DYLIB:␊ |
559 | ␉␉␉␉␉dylibCommand = binary + binaryIndex;␊ |
560 | ␉␉␉␉␉/*moduleName =␉binary + binaryIndex + ((UInt32)*((UInt32*)&dylibCommand->dylib.name));␊ |
561 | ␉␉␉␉␉ moduleVersion =␉dylibCommand->dylib.current_version;␊ |
562 | ␉␉␉␉␉ moduleCompat =␉dylibCommand->dylib.compatibility_version;␊ |
563 | ␉␉␉␉␉ */␊ |
564 | ␉␉␉␉␉break;␊ |
565 | ␉␉␉␉␉␊ |
566 | ␉␉␉␉case LC_DYLD_INFO:␊ |
567 | ␉␉␉␉␉// Bind and rebase info is stored here␊ |
568 | ␉␉␉␉␉dyldInfoCommand = binary + binaryIndex;␊ |
569 | ␉␉␉␉␉break;␊ |
570 | ␉␉␉␉␉␊ |
571 | ␉␉␉␉case LC_UUID:␊ |
572 | ␉␉␉␉␉break;␊ |
573 | ␉␉␉␉␉␊ |
574 | ␉␉␉␉case LC_UNIXTHREAD:␊ |
575 | ␉␉␉␉␉break;␊ |
576 | ␉␉␉␉␉␊ |
577 | ␉␉␉␉default:␊ |
578 | ␉␉␉␉␉DBG("Unhandled loadcommand 0x%X\n", loadCommand->cmd & 0x7FFFFFFF);␊ |
579 | ␉␉␉␉␉break;␊ |
580 | ␉␉␉␉␉␊ |
581 | ␉␉␉}␊ |
582 | ␉␉␉␊ |
583 | ␉␉␉binaryIndex += cmdSize;␊ |
584 | ␉␉}␊ |
585 | ␉␉//if(!moduleName) return NULL;␊ |
586 | ␉}␉␉␊ |
587 | ␉␊ |
588 | ␉// bind_macho uses the symbols.␊ |
589 | ␉module_start = (void*)handle_symtable((UInt32)binary, symtabCommand, symbol_handler, is64);␊ |
590 | ␉␊ |
591 | ␉// Rebase the module before binding it.␊ |
592 | ␉if(dyldInfoCommand && dyldInfoCommand->rebase_off)␊ |
593 | ␉{␊ |
594 | ␉␉rebase_macho(binary, (char*)dyldInfoCommand->rebase_off, dyldInfoCommand->rebase_size);␊ |
595 | ␉}␊ |
596 | ␉␊ |
597 | ␉if(dyldInfoCommand && dyldInfoCommand->bind_off)␊ |
598 | ␉{␊ |
599 | ␉␉bind_macho(binary, (char*)dyldInfoCommand->bind_off, dyldInfoCommand->bind_size);␊ |
600 | ␉}␊ |
601 | ␉␊ |
602 | ␉if(dyldInfoCommand && dyldInfoCommand->weak_bind_off)␊ |
603 | ␉{␊ |
604 | ␉␉// NOTE: this currently should never happen.␊ |
605 | ␉␉bind_macho(binary, (char*)dyldInfoCommand->weak_bind_off, dyldInfoCommand->weak_bind_size);␊ |
606 | ␉}␊ |
607 | ␉␊ |
608 | ␉if(dyldInfoCommand && dyldInfoCommand->lazy_bind_off)␊ |
609 | ␉{␊ |
610 | ␉␉// NOTE: we are binding the lazy pointers as a module is laoded,␊ |
611 | ␉␉// This should be changed to bind when a symbol is referened at runtime instead.␊ |
612 | ␉␉bind_macho(binary, (char*)dyldInfoCommand->lazy_bind_off, dyldInfoCommand->lazy_bind_size);␊ |
613 | ␉}␊ |
614 | ␉␊ |
615 | ␉return module_start;␊ |
616 | ␉␊ |
617 | }␊ |
618 | ␊ |
619 | // Based on code from dylibinfo.cpp and ImageLoaderMachOCompressed.cpp␊ |
620 | void rebase_macho(void* base, char* rebase_stream, UInt32 size)␊ |
621 | {␊ |
622 | ␉rebase_stream += (UInt32)base;␊ |
623 | ␉␊ |
624 | ␉UInt8 immediate = 0;␊ |
625 | ␉UInt8 opcode = 0;␊ |
626 | ␉UInt8 type = 0;␊ |
627 | ␉␊ |
628 | ␉UInt32 segmentAddress = 0;␊ |
629 | ␉␊ |
630 | ␉␊ |
631 | ␉␊ |
632 | ␉UInt32 tmp = 0;␊ |
633 | ␉UInt32 tmp2 = 0;␊ |
634 | ␉UInt8 bits = 0;␊ |
635 | ␉UInt32 index = 0;␊ |
636 | ␉␊ |
637 | ␉int done = 0;␊ |
638 | ␉unsigned int i = 0;␊ |
639 | ␉␊ |
640 | ␉while(/*!done &&*/ i < size)␊ |
641 | ␉{␊ |
642 | ␉␉immediate = rebase_stream[i] & REBASE_IMMEDIATE_MASK;␊ |
643 | ␉␉opcode = rebase_stream[i] & REBASE_OPCODE_MASK;␊ |
644 | ␉␉␊ |
645 | ␉␉␊ |
646 | ␉␉switch(opcode)␊ |
647 | ␉␉{␊ |
648 | ␉␉␉case REBASE_OPCODE_DONE:␊ |
649 | ␉␉␉␉// Rebase complete.␊ |
650 | ␉␉␉␉done = 1;␊ |
651 | ␉␉␉␉break;␊ |
652 | ␉␉␉␉␊ |
653 | ␉␉␉␉␊ |
654 | ␉␉␉case REBASE_OPCODE_SET_TYPE_IMM:␊ |
655 | ␉␉␉␉// Set rebase type (pointer, absolute32, pcrel32)␊ |
656 | ␉␉␉␉//DBG("Rebase type = 0x%X\n", immediate);␊ |
657 | ␉␉␉␉type = immediate;␊ |
658 | ␉␉␉␉break;␊ |
659 | ␉␉␉␉␊ |
660 | ␉␉␉␉␊ |
661 | ␉␉␉case REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:␊ |
662 | ␉␉␉{␊ |
663 | ␉␉␉␉// Locate address to begin rebasing␊ |
664 | ␉␉␉␉segmentAddress = 0;␊ |
665 | ␉␉␉␉␊ |
666 | ␉␉␉␉struct segment_command* segCommand = NULL; // NOTE: 32bit only␊ |
667 | ␉␉␉␉␊ |
668 | ␉␉␉␉{␊ |
669 | ␉␉␉␉␉unsigned int binIndex = 0;␊ |
670 | ␉␉␉␉␉index = 0;␊ |
671 | ␉␉␉␉␉do␊ |
672 | ␉␉␉␉␉{␊ |
673 | ␉␉␉␉␉␉segCommand = base + sizeof(struct mach_header) + binIndex;␊ |
674 | ␉␉␉␉␉␉␊ |
675 | ␉␉␉␉␉␉␊ |
676 | ␉␉␉␉␉␉binIndex += segCommand->cmdsize;␊ |
677 | ␉␉␉␉␉␉index++;␊ |
678 | ␉␉␉␉␉}␊ |
679 | ␉␉␉␉␉while(index <= immediate);␊ |
680 | ␉␉␉␉}␉␉␉␉␊ |
681 | ␉␉␉␉␊ |
682 | ␉␉␉␉segmentAddress = segCommand->fileoff;␊ |
683 | ␉␉␉␉␊ |
684 | ␉␉␉␉tmp = 0;␊ |
685 | ␉␉␉␉bits = 0;␊ |
686 | ␉␉␉␉do␊ |
687 | ␉␉␉␉{␊ |
688 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
689 | ␉␉␉␉␉bits += 7;␊ |
690 | ␉␉␉␉}␊ |
691 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
692 | ␉␉␉␉␊ |
693 | ␉␉␉␉segmentAddress += tmp;␊ |
694 | ␉␉␉␉break;␊ |
695 | ␉␉␉}␉␉␉␉␊ |
696 | ␉␉␉case REBASE_OPCODE_ADD_ADDR_ULEB:␊ |
697 | ␉␉␉␉// Add value to rebase address␊ |
698 | ␉␉␉␉tmp = 0;␊ |
699 | ␉␉␉␉bits = 0;␊ |
700 | ␉␉␉␉do␊ |
701 | ␉␉␉␉{␊ |
702 | ␉␉␉␉␉tmp <<= bits;␊ |
703 | ␉␉␉␉␉tmp |= rebase_stream[++i] & 0x7f;␊ |
704 | ␉␉␉␉␉bits += 7;␊ |
705 | ␉␉␉␉}␊ |
706 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
707 | ␉␉␉␉␊ |
708 | ␉␉␉␉segmentAddress +=␉tmp; ␊ |
709 | ␉␉␉␉break;␊ |
710 | ␉␉␉␉␊ |
711 | ␉␉␉case REBASE_OPCODE_ADD_ADDR_IMM_SCALED:␊ |
712 | ␉␉␉␉segmentAddress += immediate * sizeof(void*);␊ |
713 | ␉␉␉␉break;␊ |
714 | ␉␉␉␉␊ |
715 | ␉␉␉␉␊ |
716 | ␉␉␉case REBASE_OPCODE_DO_REBASE_IMM_TIMES:␊ |
717 | ␉␉␉␉index = 0;␊ |
718 | ␉␉␉␉for (index = 0; index < immediate; ++index)␊ |
719 | ␉␉␉␉{␊ |
720 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␊ |
721 | ␉␉␉␉␉segmentAddress += sizeof(void*);␊ |
722 | ␉␉␉␉}␊ |
723 | ␉␉␉␉break;␊ |
724 | ␉␉␉␉␊ |
725 | ␉␉␉␉␊ |
726 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ULEB_TIMES:␊ |
727 | ␉␉␉␉tmp = 0;␊ |
728 | ␉␉␉␉bits = 0;␊ |
729 | ␉␉␉␉do␊ |
730 | ␉␉␉␉{␊ |
731 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
732 | ␉␉␉␉␉bits += 7;␊ |
733 | ␉␉␉␉}␊ |
734 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
735 | ␉␉␉␉␊ |
736 | ␉␉␉␉index = 0;␊ |
737 | ␉␉␉␉for (index = 0; index < tmp; ++index)␊ |
738 | ␉␉␉␉{␊ |
739 | ␉␉␉␉␉//DBG("\tRebasing 0x%X\n", segmentAddress);␊ |
740 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␉␉␉␉␉␊ |
741 | ␉␉␉␉␉segmentAddress += sizeof(void*);␊ |
742 | ␉␉␉␉}␊ |
743 | ␉␉␉␉break;␊ |
744 | ␉␉␉␉␊ |
745 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB:␊ |
746 | ␉␉␉␉tmp = 0;␊ |
747 | ␉␉␉␉bits = 0;␊ |
748 | ␉␉␉␉do␊ |
749 | ␉␉␉␉{␊ |
750 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
751 | ␉␉␉␉␉bits += 7;␊ |
752 | ␉␉␉␉}␊ |
753 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
754 | ␉␉␉␉␊ |
755 | ␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␊ |
756 | ␉␉␉␉␊ |
757 | ␉␉␉␉segmentAddress += tmp + sizeof(void*);␊ |
758 | ␉␉␉␉break;␊ |
759 | ␉␉␉␉␊ |
760 | ␉␉␉case REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB:␊ |
761 | ␉␉␉␉tmp = 0;␊ |
762 | ␉␉␉␉bits = 0;␊ |
763 | ␉␉␉␉do␊ |
764 | ␉␉␉␉{␊ |
765 | ␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊ |
766 | ␉␉␉␉␉bits += 7;␊ |
767 | ␉␉␉␉}␊ |
768 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
769 | ␉␉␉␉␊ |
770 | ␉␉␉␉␊ |
771 | ␉␉␉␉tmp2 = 0;␊ |
772 | ␉␉␉␉bits = 0;␊ |
773 | ␉␉␉␉do␊ |
774 | ␉␉␉␉{␊ |
775 | ␉␉␉␉␉tmp2 |= (rebase_stream[++i] & 0x7f) << bits;␊ |
776 | ␉␉␉␉␉bits += 7;␊ |
777 | ␉␉␉␉}␊ |
778 | ␉␉␉␉while(rebase_stream[i] & 0x80);␊ |
779 | ␉␉␉␉␊ |
780 | ␉␉␉␉index = 0;␊ |
781 | ␉␉␉␉for (index = 0; index < tmp; ++index)␊ |
782 | ␉␉␉␉{␊ |
783 | ␉␉␉␉␉␊ |
784 | ␉␉␉␉␉rebase_location(base + segmentAddress, (char*)base, type);␊ |
785 | ␉␉␉␉␉␊ |
786 | ␉␉␉␉␉segmentAddress += tmp2 + sizeof(void*);␊ |
787 | ␉␉␉␉}␊ |
788 | ␉␉␉␉break;␊ |
789 | ␉␉␉default:␊ |
790 | ␉␉␉␉break;␊ |
791 | ␉␉}␊ |
792 | ␉␉i++;␊ |
793 | ␉}␊ |
794 | }␊ |
795 | ␊ |
796 | // Based on code from dylibinfo.cpp and ImageLoaderMachOCompressed.cpp␊ |
797 | // NOTE: this uses 32bit values, and not 64bit values. ␊ |
798 | // There is apossibility that this could cause issues,␊ |
799 | // however the macho file is 32 bit, so it shouldn't matter too much␊ |
800 | void bind_macho(void* base, char* bind_stream, UInt32 size)␊ |
801 | {␉␊ |
802 | ␉bind_stream += (UInt32)base;␊ |
803 | ␉␊ |
804 | ␉UInt8 immediate = 0;␊ |
805 | ␉UInt8 opcode = 0;␊ |
806 | ␉UInt8 type = 0;␊ |
807 | ␉␊ |
808 | ␉UInt32 segmentAddress = 0;␊ |
809 | ␉␊ |
810 | ␉UInt32 address = 0;␊ |
811 | ␉␊ |
812 | ␉SInt32 addend = 0;␉␉␉// TODO: handle this␊ |
813 | ␉SInt32 libraryOrdinal = 0;␊ |
814 | ␉␊ |
815 | ␉const char* symbolName = NULL;␊ |
816 | ␉UInt8 symboFlags = 0;␊ |
817 | ␉UInt32 symbolAddr = 0xFFFFFFFF;␊ |
818 | ␉␊ |
819 | ␉// Temperary variables␊ |
820 | ␉UInt8 bits = 0;␊ |
821 | ␉UInt32 tmp = 0;␊ |
822 | ␉UInt32 tmp2 = 0;␊ |
823 | ␉␊ |
824 | ␉UInt32 index = 0;␊ |
825 | ␉int done = 0;␊ |
826 | ␉unsigned int i = 0;␊ |
827 | ␉␊ |
828 | ␉while(/*!done &&*/ i < size)␊ |
829 | ␉{␊ |
830 | ␉␉immediate = bind_stream[i] & BIND_IMMEDIATE_MASK;␊ |
831 | ␉␉opcode = bind_stream[i] & BIND_OPCODE_MASK;␊ |
832 | ␉␉␊ |
833 | ␉␉␊ |
834 | ␉␉switch(opcode)␊ |
835 | ␉␉{␊ |
836 | ␉␉␉case BIND_OPCODE_DONE:␊ |
837 | ␉␉␉␉done = 1; ␊ |
838 | ␉␉␉␉break;␊ |
839 | ␉␉␉␉␊ |
840 | ␉␉␉case BIND_OPCODE_SET_DYLIB_ORDINAL_IMM:␊ |
841 | ␉␉␉␉libraryOrdinal = immediate;␊ |
842 | ␉␉␉␉//DBG("BIND_OPCODE_SET_DYLIB_ORDINAL_IMM: %d\n", libraryOrdinal);␊ |
843 | ␉␉␉␉break;␊ |
844 | ␉␉␉␉␊ |
845 | ␉␉␉case BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB:␊ |
846 | ␉␉␉␉libraryOrdinal = 0;␊ |
847 | ␉␉␉␉bits = 0;␊ |
848 | ␉␉␉␉do␊ |
849 | ␉␉␉␉{␊ |
850 | ␉␉␉␉␉libraryOrdinal |= (bind_stream[++i] & 0x7f) << bits;␊ |
851 | ␉␉␉␉␉bits += 7;␊ |
852 | ␉␉␉␉}␊ |
853 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
854 | ␉␉␉␉␊ |
855 | ␉␉␉␉//DBG("BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB: %d\n", libraryOrdinal);␊ |
856 | ␉␉␉␉␊ |
857 | ␉␉␉␉break;␊ |
858 | ␉␉␉␉␊ |
859 | ␉␉␉case BIND_OPCODE_SET_DYLIB_SPECIAL_IMM:␊ |
860 | ␉␉␉␉// NOTE: this is wrong, fortunately we don't use it␊ |
861 | ␉␉␉␉libraryOrdinal = -immediate;␊ |
862 | ␉␉␉␉//DBG("BIND_OPCODE_SET_DYLIB_SPECIAL_IMM: %d\n", libraryOrdinal);␊ |
863 | ␉␉␉␉␊ |
864 | ␉␉␉␉break;␊ |
865 | ␉␉␉␉␊ |
866 | ␉␉␉case BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:␊ |
867 | ␉␉␉␉symboFlags = immediate;␊ |
868 | ␉␉␉␉symbolName = (char*)&bind_stream[++i];␊ |
869 | ␉␉␉␉i += strlen((char*)&bind_stream[i]);␊ |
870 | ␉␉␉␉//DBG("BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM: %s, 0x%X\n", symbolName, symboFlags);␊ |
871 | ␉␉␉␉␊ |
872 | ␉␉␉␉symbolAddr = lookup_all_symbols(symbolName);␊ |
873 | ␉␉␉␉␊ |
874 | ␉␉␉␉break;␊ |
875 | ␉␉␉␉␊ |
876 | ␉␉␉case BIND_OPCODE_SET_TYPE_IMM:␊ |
877 | ␉␉␉␉// Set bind type (pointer, absolute32, pcrel32)␊ |
878 | ␉␉␉␉type = immediate;␊ |
879 | ␉␉␉␉//DBG("BIND_OPCODE_SET_TYPE_IMM: %d\n", type);␊ |
880 | ␉␉␉␉␊ |
881 | ␉␉␉␉break;␊ |
882 | ␉␉␉␉␊ |
883 | ␉␉␉case BIND_OPCODE_SET_ADDEND_SLEB:␊ |
884 | ␉␉␉␉addend = 0;␊ |
885 | ␉␉␉␉bits = 0;␊ |
886 | ␉␉␉␉do␊ |
887 | ␉␉␉␉{␊ |
888 | ␉␉␉␉␉addend |= (bind_stream[++i] & 0x7f) << bits;␊ |
889 | ␉␉␉␉␉bits += 7;␊ |
890 | ␉␉␉␉}␊ |
891 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
892 | ␉␉␉␉␊ |
893 | ␉␉␉␉if(!(bind_stream[i-1] & 0x40)) addend *= -1;␊ |
894 | ␉␉␉␉␊ |
895 | ␉␉␉␉//DBG("BIND_OPCODE_SET_ADDEND_SLEB: %d\n", addend);␊ |
896 | ␉␉␉␉break;␊ |
897 | ␉␉␉␉␊ |
898 | ␉␉␉case BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:␊ |
899 | ␉␉␉{␊ |
900 | ␉␉␉␉segmentAddress = 0;␊ |
901 | ␉␉␉␉␊ |
902 | ␉␉␉␉// Locate address␊ |
903 | ␉␉␉␉struct segment_command* segCommand = NULL;␉// NOTE: 32bit only␊ |
904 | ␉␉␉␉␊ |
905 | ␉␉␉␉{␊ |
906 | ␉␉␉␉␉unsigned int binIndex = 0;␊ |
907 | ␉␉␉␉␉index = 0;␊ |
908 | ␉␉␉␉␉do␊ |
909 | ␉␉␉␉␉{␊ |
910 | ␉␉␉␉␉␉segCommand = base + sizeof(struct mach_header) + binIndex;␊ |
911 | ␉␉␉␉␉␉binIndex += segCommand->cmdsize;␊ |
912 | ␉␉␉␉␉␉index++;␊ |
913 | ␉␉␉␉␉}while(index <= immediate);␊ |
914 | ␉␉␉␉}␊ |
915 | ␉␉␉␉␊ |
916 | ␉␉␉␉␊ |
917 | ␉␉␉␉segmentAddress = segCommand->fileoff;␊ |
918 | ␉␉␉␉␊ |
919 | ␉␉␉␉// Read in offset␊ |
920 | ␉␉␉␉tmp = 0;␊ |
921 | ␉␉␉␉bits = 0;␊ |
922 | ␉␉␉␉do␊ |
923 | ␉␉␉␉{␊ |
924 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
925 | ␉␉␉␉␉bits += 7;␊ |
926 | ␉␉␉␉}while(bind_stream[i] & 0x80);␊ |
927 | ␉␉␉␉␊ |
928 | ␉␉␉␉segmentAddress += tmp;␊ |
929 | ␉␉␉␉␊ |
930 | ␉␉␉␉//DBG("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: 0x%X\n", segmentAddress);␊ |
931 | ␉␉␉␉break;␊ |
932 | ␉␉␉}␉␉␉␉␊ |
933 | ␉␉␉case BIND_OPCODE_ADD_ADDR_ULEB:␊ |
934 | ␉␉␉␉// Read in offset␊ |
935 | ␉␉␉␉tmp = 0;␊ |
936 | ␉␉␉␉bits = 0;␊ |
937 | ␉␉␉␉do␊ |
938 | ␉␉␉␉{␊ |
939 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
940 | ␉␉␉␉␉bits += 7;␊ |
941 | ␉␉␉␉}␊ |
942 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
943 | ␉␉␉␉␊ |
944 | ␉␉␉␉segmentAddress += tmp;␊ |
945 | ␉␉␉␉//DBG("BIND_OPCODE_ADD_ADDR_ULEB: 0x%X\n", segmentAddress);␊ |
946 | ␉␉␉␉break;␊ |
947 | ␉␉␉␉␊ |
948 | ␉␉␉case BIND_OPCODE_DO_BIND:␊ |
949 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND\n");␊ |
950 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
951 | ␉␉␉␉{␊ |
952 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
953 | ␉␉␉␉␉␊ |
954 | ␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, BIND_TYPE_POINTER);␊ |
955 | ␉␉␉␉}␊ |
956 | ␉␉␉␉else if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
957 | ␉␉␉␉{␊ |
958 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
959 | getc();␊ |
960 | ␉␉␉␉}␊ |
961 | ␉␉␉␉␊ |
962 | ␉␉␉␉segmentAddress += sizeof(void*);␊ |
963 | ␉␉␉␉break;␊ |
964 | ␉␉␉␉␊ |
965 | ␉␉␉case BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:␊ |
966 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB\n");␊ |
967 | ␉␉␉␉␊ |
968 | ␉␉␉␉␊ |
969 | ␉␉␉␉// Read in offset␊ |
970 | ␉␉␉␉tmp = 0;␊ |
971 | ␉␉␉␉bits = 0;␊ |
972 | ␉␉␉␉do␊ |
973 | ␉␉␉␉{␊ |
974 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
975 | ␉␉␉␉␉bits += 7;␊ |
976 | ␉␉␉␉}␊ |
977 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
978 | ␉␉␉␉␊ |
979 | ␉␉␉␉␊ |
980 | ␉␉␉␉␊ |
981 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
982 | ␉␉␉␉{␊ |
983 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
984 | ␉␉␉␉␉␊ |
985 | ␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, BIND_TYPE_POINTER);␊ |
986 | ␉␉␉␉}␊ |
987 | ␉␉␉␉else if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
988 | ␉␉␉␉{␊ |
989 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
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 | ␉␉␉␉␊ |
999 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
1000 | ␉␉␉␉{␊ |
1001 | ␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
1002 | ␉␉␉␉␉␊ |
1003 | ␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, BIND_TYPE_POINTER);␊ |
1004 | ␉␉␉␉}␊ |
1005 | ␉␉␉␉else if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
1006 | ␉␉␉␉{␊ |
1007 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
1008 | ␉␉␉␉}␊ |
1009 | ␉␉␉␉segmentAddress += (immediate * sizeof(void*)) + sizeof(void*);␊ |
1010 | ␉␉␉␉␊ |
1011 | ␉␉␉␉␊ |
1012 | ␉␉␉␉break;␊ |
1013 | ␉␉␉␉␊ |
1014 | ␉␉␉case BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:␊ |
1015 | ␉␉␉␉␊ |
1016 | ␉␉␉␉tmp = 0;␊ |
1017 | ␉␉␉␉bits = 0;␊ |
1018 | ␉␉␉␉do␊ |
1019 | ␉␉␉␉{␊ |
1020 | ␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊ |
1021 | ␉␉␉␉␉bits += 7;␊ |
1022 | ␉␉␉␉}␊ |
1023 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
1024 | ␉␉␉␉␊ |
1025 | ␉␉␉␉␊ |
1026 | ␉␉␉␉tmp2 = 0;␊ |
1027 | ␉␉␉␉bits = 0;␊ |
1028 | ␉␉␉␉do␊ |
1029 | ␉␉␉␉{␊ |
1030 | ␉␉␉␉␉tmp2 |= (bind_stream[++i] & 0x7f) << bits;␊ |
1031 | ␉␉␉␉␉bits += 7;␊ |
1032 | ␉␉␉␉}␊ |
1033 | ␉␉␉␉while(bind_stream[i] & 0x80);␊ |
1034 | ␉␉␉␉␊ |
1035 | ␉␉␉␉␊ |
1036 | ␉␉␉␉//DBG("BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB 0x%X 0x%X\n", tmp, tmp2);␊ |
1037 | ␉␉␉␉␊ |
1038 | ␉␉␉␉␊ |
1039 | ␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊ |
1040 | ␉␉␉␉{␊ |
1041 | ␉␉␉␉␉for(index = 0; index < tmp; index++)␊ |
1042 | ␉␉␉␉␉{␊ |
1043 | ␉␉␉␉␉␉␊ |
1044 | ␉␉␉␉␉␉address = segmentAddress + (UInt32)base;␊ |
1045 | ␉␉␉␉␉␉␊ |
1046 | ␉␉␉␉␉␉bind_location((UInt32*)address, (char*)symbolAddr, addend, BIND_TYPE_POINTER);␊ |
1047 | ␉␉␉␉␉␉␊ |
1048 | ␉␉␉␉␉␉segmentAddress += tmp2 + sizeof(void*);␊ |
1049 | ␉␉␉␉␉}␊ |
1050 | ␉␉␉␉}␊ |
1051 | ␉␉␉␉else if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
1052 | ␉␉␉␉{␊ |
1053 | ␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊ |
1054 | ␉␉␉␉}␊ |
1055 | ␉␉␉␉␊ |
1056 | ␉␉␉␉␊ |
1057 | ␉␉␉␉break;␊ |
1058 | ␉␉␉default:␊ |
1059 | ␉␉␉␉break;␊ |
1060 | ␉␉␉␉␊ |
1061 | ␉␉}␊ |
1062 | ␉␉i++;␊ |
1063 | ␉}␊ |
1064 | }␊ |
1065 | ␊ |
1066 | inline void rebase_location(UInt32* location, char* base, int type)␊ |
1067 | {␉␊ |
1068 | ␉switch(type)␊ |
1069 | ␉{␊ |
1070 | ␉␉case REBASE_TYPE_POINTER:␊ |
1071 | ␉␉case REBASE_TYPE_TEXT_ABSOLUTE32:␊ |
1072 | ␉␉␉*location += (UInt32)base;␊ |
1073 | ␉␉␉break;␊ |
1074 | ␉␉␉␊ |
1075 | ␉␉default:␊ |
1076 | ␉␉␉break;␊ |
1077 | ␉}␊ |
1078 | }␊ |
1079 | ␊ |
1080 | inline void bind_location(UInt32* location, char* value, UInt32 addend, int type)␊ |
1081 | {␉␊ |
1082 | ␉// do actual update␊ |
1083 | ␉char* newValue = value + addend;␊ |
1084 | ␉␊ |
1085 | ␉switch (type) {␊ |
1086 | ␉␉case BIND_TYPE_POINTER:␊ |
1087 | ␉␉case BIND_TYPE_TEXT_ABSOLUTE32:␊ |
1088 | ␉␉␉break;␊ |
1089 | ␉␉␉␊ |
1090 | ␉␉case BIND_TYPE_TEXT_PCREL32:␊ |
1091 | ␉␉␉newValue -= ((UInt32)location + 4);␊ |
1092 | ␉␉␉␊ |
1093 | ␉␉␉break;␊ |
1094 | ␉␉default:␊ |
1095 | ␉␉␉return;␊ |
1096 | ␉}␊ |
1097 | ␉*location = (UInt32)newValue;␊ |
1098 | ␉␊ |
1099 | ␉␊ |
1100 | }␊ |
1101 | ␊ |
1102 | /*␊ |
1103 | * add_symbol␊ |
1104 | * This function adds a symbol from a module to the list of known symbols ␊ |
1105 | * possibly change to a pointer and add this to the Symbol module so that it can␊ |
1106 | * adjust it's internal symbol list (sort) to optimize locating new symbols␊ |
1107 | * NOTE: returns the address if the symbol is "start", else returns 0xFFFFFFFF␊ |
1108 | */␊ |
1109 | long long add_symbol(char* symbol, long long addr, char is64)␊ |
1110 | {␊ |
1111 | ␉if(is64) return 0xFFFFFFFF; // Fixme␊ |
1112 | ␉␊ |
1113 | ␉// This only can handle 32bit symbols ␊ |
1114 | ␉symbolList_t* new_entry= malloc(sizeof(symbolList_t));␊ |
1115 | ␉DBG("Adding symbol %s at 0x%X\n", symbol, addr);␊ |
1116 | ␉if (new_entry)␊ |
1117 | ␉{␉␊ |
1118 | ␉␉new_entry->next = moduleSymbols;␊ |
1119 | ␉␉␊ |
1120 | ␉␉moduleSymbols = new_entry;␊ |
1121 | ␉␉␊ |
1122 | ␉␉new_entry->addr = (UInt32)addr;␊ |
1123 | ␉␉new_entry->symbol = symbol;␊ |
1124 | ␉␉return addr;␊ |
1125 | ␉}␉␊ |
1126 | ␉␊ |
1127 | ␉return 0xFFFFFFFF;␊ |
1128 | ␉␊ |
1129 | }␊ |
1130 | ␊ |
1131 | /*␊ |
1132 | * print out the information about the loaded module␊ |
1133 | */␊ |
1134 | VOID module_loaded(const char* name/*, UInt32 version, UInt32 compat*/)␊ |
1135 | {␊ |
1136 | ␉moduleList_t* new_entry = malloc(sizeof(moduleList_t));␊ |
1137 | ␉if (new_entry)␊ |
1138 | ␉{␉␊ |
1139 | ␉␉new_entry->next = loadedModules;␊ |
1140 | ␉␉␊ |
1141 | ␉␉loadedModules = new_entry;␊ |
1142 | ␉␉␊ |
1143 | ␉␉new_entry->module = (char*)name;␊ |
1144 | ␉␉//␉new_entry->version = version;␊ |
1145 | ␉␉//␉new_entry->compat = compat;␊ |
1146 | ␉}␊ |
1147 | }␊ |
1148 | ␊ |
1149 | EFI_STATUS is_module_loaded(const char* name)␊ |
1150 | {␊ |
1151 | ␉moduleList_t* entry = loadedModules;␊ |
1152 | ␉while(entry)␊ |
1153 | ␉{␊ |
1154 | ␉␉DBG("Comparing %s with %s\n", name, entry->module);␊ |
1155 | ␉␉char *fullname = newStringWithFormat("%s.dylib",name);␊ |
1156 | ␉␉if(fullname && ((strcmp(entry->module, name) == 0) || (strcmp(entry->module, fullname) == 0)))␊ |
1157 | ␉␉{␊ |
1158 | ␉␉␉free(fullname);␊ |
1159 | ␉␉␉DBG("Located module %s\n", name);␊ |
1160 | ␉␉␉return EFI_SUCCESS;␊ |
1161 | ␉␉}␊ |
1162 | ␉␉else␊ |
1163 | ␉␉{␊ |
1164 | ␉␉␉entry = entry->next;␊ |
1165 | ␉␉}␊ |
1166 | ␉␉␊ |
1167 | ␉}␊ |
1168 | ␉DBG("Module %s not found\n", name);␊ |
1169 | ␉␊ |
1170 | ␉return EFI_NOT_FOUND;␊ |
1171 | }␊ |
1172 | ␊ |
1173 | // Look for symbols using the Smbols moduel function.␊ |
1174 | // If non are found, look through the list of module symbols␊ |
1175 | unsigned int lookup_all_symbols(const char* name)␊ |
1176 | {␊ |
1177 | ␉{␊ |
1178 | ␉␉unsigned int addr = 0xFFFFFFFF;␊ |
1179 | ␉␉if(lookup_symbol && (UInt32)lookup_symbol != 0xFFFFFFFF)␊ |
1180 | ␉␉{␊ |
1181 | ␉␉␉addr = lookup_symbol(name, &strcmp);␊ |
1182 | ␉␉␉if(addr != 0xFFFFFFFF)␊ |
1183 | ␉␉␉{␊ |
1184 | ␉␉␉␉DBG("Internal symbol %s located at 0x%X\n", name, addr);␊ |
1185 | ␉␉␉␉return addr;␊ |
1186 | ␉␉␉}␊ |
1187 | ␉␉}␊ |
1188 | ␉}␉␊ |
1189 | ␉␊ |
1190 | ␉{␊ |
1191 | ␉␉symbolList_t* entry = moduleSymbols;␊ |
1192 | ␉␉while(entry)␊ |
1193 | ␉␉{␊ |
1194 | ␉␉␉if(strcmp(entry->symbol, name) == 0)␊ |
1195 | ␉␉␉{␊ |
1196 | ␉␉␉␉DBG("External symbol %s located at 0x%X\n", name, entry->addr);␊ |
1197 | ␉␉␉␉return entry->addr;␊ |
1198 | ␉␉␉}␊ |
1199 | ␉␉␉else␊ |
1200 | ␉␉␉{␊ |
1201 | ␉␉␉␉entry = entry->next;␊ |
1202 | ␉␉␉}␊ |
1203 | ␉␉␉␊ |
1204 | ␉␉}␊ |
1205 | ␉}␊ |
1206 | ␉␊ |
1207 | #if DEBUG_MODULES␊ |
1208 | ␉if(strcmp(name, SYMBOL_DYLD_STUB_BINDER) != 0)␊ |
1209 | ␉{␊ |
1210 | ␉␉verbose("Unable to locate symbol %s\n", name);␊ |
1211 | ␉␉getc();␊ |
1212 | ␉}␊ |
1213 | #endif␊ |
1214 | ␉return 0xFFFFFFFF;␊ |
1215 | }␊ |
1216 | ␊ |
1217 | ␊ |
1218 | /*␊ |
1219 | * parse the symbol table␊ |
1220 | * Lookup any undefined symbols␊ |
1221 | */␊ |
1222 | ␊ |
1223 | unsigned int handle_symtable(UInt32 base, struct symtab_command* symtabCommand, long long(*symbol_handler)(char*, long long, char), char is64)␊ |
1224 | {␉␉␊ |
1225 | ␉unsigned int module_start = 0xFFFFFFFF;␊ |
1226 | ␉␊ |
1227 | ␉UInt32 symbolIndex = 0;␊ |
1228 | ␉char* symbolString = base + (char*)symtabCommand->stroff;␊ |
1229 | ␉//char* symbolTable = base + symtabCommand->symoff;␊ |
1230 | ␉if(!is64)␊ |
1231 | ␉{␊ |
1232 | ␉␉struct nlist* symbolEntry = (void*)base + symtabCommand->symoff;␊ |
1233 | ␉␉while(symbolIndex < symtabCommand->nsyms)␊ |
1234 | ␉␉{␉␉␉␉␉␉␊ |
1235 | ␉␉␉if(symbolEntry->n_value)␊ |
1236 | ␉␉␉{␉␉␉␉␊ |
1237 | ␉␉␉␉if(strstr(symbolString + symbolEntry->n_un.n_strx, "module_start") || (strcmp(symbolString + symbolEntry->n_un.n_strx, "start") == 0))␊ |
1238 | ␉␉␉␉{␊ |
1239 | ␉␉␉␉␉module_start = base + symbolEntry->n_value;␊ |
1240 | ␉␉␉␉␉DBG("n_value %x module_start %x\n", (unsigned)symbolEntry->n_value, (unsigned)module_start);␊ |
1241 | ␉␉␉␉}␊ |
1242 | ␉␉␉␉else␊ |
1243 | ␉␉␉␉{␊ |
1244 | ␉␉␉␉␉symbol_handler(symbolString + symbolEntry->n_un.n_strx, (long long)base + symbolEntry->n_value, is64);␊ |
1245 | ␉␉␉␉}␊ |
1246 | #if DEBUG_MODULES␊ |
1247 | ␉␉␉␉bool isTexT = (((unsigned)symbolEntry->n_value > (unsigned)vmaddr) && ((unsigned)(vmaddr + vmsize) > (unsigned)symbolEntry->n_value ));␊ |
1248 | ␉␉␉␉printf("%s %s\n", isTexT ? "__TEXT :" : "__DATA(OR ANY) :", symbolString + symbolEntry->n_un.n_strx);␊ |
1249 | #if DEBUG_MODULES==2␉␊ |
1250 | ␉␉␉␉␊ |
1251 | ␉␉␉␉if(strcmp(symbolString + symbolEntry->n_un.n_strx, "_BootHelp_txt") == 0)␊ |
1252 | ␉␉␉␉{␊ |
1253 | ␉␉␉␉␉long long addr = (long long)base + symbolEntry->n_value;␊ |
1254 | ␉␉␉␉␉unsigned char *BootHelp = NULL;␊ |
1255 | ␉␉␉␉␉BootHelp = (unsigned char*)(UInt32)addr;␉␉␉␉␉␊ |
1256 | ␉␉␉␉␉printf("method 1: __DATA : BootHelp_txt[0] %x\n", BootHelp[0]);␊ |
1257 | ␉␉␉␉␉␊ |
1258 | ␉␉␉␉␉long long addr2 = symbolEntry->n_value;␊ |
1259 | ␉␉␉␉␉unsigned char *BootHelp2 = NULL;␊ |
1260 | ␉␉␉␉␉BootHelp2 = (unsigned char*)(UInt32)addr2;␉␉␉␉␉␊ |
1261 | ␉␉␉␉␉printf("method 2: __DATA : BootHelp_txt[0] %x\n", BootHelp2[0]);␊ |
1262 | ␉␉␉␉}␊ |
1263 | #endif␊ |
1264 | #endif␊ |
1265 | ␉␉␉␉␊ |
1266 | ␉␉␉}␊ |
1267 | ␉␉␉␊ |
1268 | ␉␉␉symbolEntry++;␊ |
1269 | ␉␉␉symbolIndex++;␉// TODO remove␊ |
1270 | ␉␉}␊ |
1271 | ␉}␊ |
1272 | ␉else␊ |
1273 | ␉{␊ |
1274 | ␉␉struct nlist_64* symbolEntry = (void*)base + symtabCommand->symoff;␊ |
1275 | ␉␉// NOTE First entry is *not* correct, but we can ignore it (i'm getting radar:// right now)␉␊ |
1276 | ␉␉while(symbolIndex < symtabCommand->nsyms)␊ |
1277 | ␉␉{␉␊ |
1278 | ␉␉␉␊ |
1279 | ␉␉␉if(strstr(symbolString + symbolEntry->n_un.n_strx, "module_start") || (strcmp(symbolString + symbolEntry->n_un.n_strx, "start") == 0))␊ |
1280 | ␉␉␉{␊ |
1281 | ␉␉␉␉module_start = base + symbolEntry->n_value;␊ |
1282 | ␉␉␉}␊ |
1283 | ␉␉␉else␊ |
1284 | ␉␉␉{␊ |
1285 | ␉␉␉␉symbol_handler(symbolString + symbolEntry->n_un.n_strx, (long long)base + symbolEntry->n_value, is64);␊ |
1286 | ␉␉␉}␊ |
1287 | ␉␉␉␊ |
1288 | ␉␉␉symbolEntry++;␊ |
1289 | ␉␉␉symbolIndex++;␉// TODO remove␊ |
1290 | ␉␉}␊ |
1291 | ␉}␊ |
1292 | ␉␊ |
1293 | ␉return module_start;␊ |
1294 | ␉␊ |
1295 | }␊ |
1296 | ␊ |
1297 | ␊ |
1298 | /*␊ |
1299 | * Locate the symbol for an already loaded function and modify the beginning of␊ |
1300 | * the function to jump directly to the new one␊ |
1301 | * example: replace_function("_HelloWorld_start", &replacement_start);␊ |
1302 | */␊ |
1303 | EFI_STATUS replace_function(const char* symbol, void* newAddress)␊ |
1304 | {␉␉ ␊ |
1305 | ␉// TODO: look into using the next four bytes of the function instead␊ |
1306 | ␉// Most functions should support this, as they probably will be at ␊ |
1307 | ␉// least 10 bytes long, but you never know, this is sligtly safer as␊ |
1308 | ␉// function can be as small as 6 bytes.␊ |
1309 | ␉UInt32 addr = lookup_all_symbols(symbol);␊ |
1310 | ␉␊ |
1311 | ␉char* binary = (char*)addr;␊ |
1312 | ␉if(addr != 0xFFFFFFFF)␊ |
1313 | ␉{␊ |
1314 | ␉␉UInt32* jumpPointer = malloc(sizeof(UInt32*));␊ |
1315 | ␉␉if (!jumpPointer) {␊ |
1316 | ␉␉␉return EFI_OUT_OF_RESOURCES;␊ |
1317 | ␉␉}␊ |
1318 | ␉␉␊ |
1319 | ␉␉*binary++ = 0xFF;␉// Jump␊ |
1320 | ␉␉*binary++ = 0x25;␉// Long Jump␊ |
1321 | ␉␉*((UInt32*)binary) = (UInt32)jumpPointer;␊ |
1322 | ␉␉␊ |
1323 | ␉␉*jumpPointer = (UInt32)newAddress;␊ |
1324 | ␉␉␊ |
1325 | ␉␉return EFI_SUCCESS;␊ |
1326 | ␉}␊ |
1327 | ␉␊ |
1328 | ␉return EFI_NOT_FOUND;␊ |
1329 | ␉␊ |
1330 | }␊ |
1331 | |