dyld3/APIs_macOS.cpp

   1 /*
   2  * Copyright (c) 2017 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24
  25 #include <string.h>
  26 #include <stdio.h>
  27 #include <stdint.h>
  28 #include <_simple.h>
  29 #include <sys/errno.h>
  30 #include <sys/mman.h>
  31 #include <sys/stat.h>
  32 #include <dirent.h>
  33 #include <fcntl.h>
  34 #include <TargetConditionals.h>
  35 #include <malloc/malloc.h>
  36 #include <mach-o/dyld_priv.h>
  37 #include <mach-o/dyld_images.h>
  38
  39 #include <algorithm>
  40
  41 #include "dlfcn.h"
  42
  43 #include "AllImages.h"
  44 #include "Loading.h"
  45 #include "Logging.h"
  46 #include "Diagnostics.h"
  47 #include "DyldSharedCache.h"
  48 #include "APIs.h"
  49
  50
  51 namespace dyld3 {
  52
  53 // from APIs.cpp
  54 void                    parseDlHandle(void* h, const MachOLoaded** mh, bool* dontContinue);
  55
  56
  57 // only in macOS and deprecated
  58 #if __MAC_OS_X_VERSION_MIN_REQUIRED
  59
  60 // macOS needs to support an old API that only works with fileype==MH_BUNDLE.
  61 // In this deprecated API (unlike dlopen), loading and linking are separate steps.
  62 // NSCreateObjectFileImageFrom*() just maps in the bundle mach-o file.
  63 // NSLinkModule() does the load of dependent modules and rebasing/binding.
  64 // To unload one of these, you must call NSUnLinkModule() and NSDestroyObjectFileImage() in any order!
  65 //
  66
  67 NSObjectFileImageReturnCode NSCreateObjectFileImageFromFile(const char* path, NSObjectFileImage* ofi)
  68 {
  69     log_apis("NSCreateObjectFileImageFromFile(\"%s\", %p)\n", path, ofi);
  70
  71     // verify path exists
  72      struct stat statbuf;
  73     if ( ::stat(path, &statbuf) == -1 )
  74         return NSObjectFileImageFailure;
  75
  76     // create ofi that just contains path. NSLinkModule does all the work
  77     OFIInfo result;
  78     result.path        = strdup(path);
  79     result.memSource   = nullptr;
  80     result.memLength   = 0;
  81     result.loadAddress = nullptr;
  82     result.imageNum    = 0;
  83     *ofi = gAllImages.addNSObjectFileImage(result);
  84
  85     log_apis("NSCreateObjectFileImageFromFile() => %p\n", *ofi);
  86
  87     return NSObjectFileImageSuccess;
  88 }
  89
  90 NSObjectFileImageReturnCode NSCreateObjectFileImageFromMemory(const void* memImage, size_t memImageSize, NSObjectFileImage *ofi)
  91 {
  92     log_apis("NSCreateObjectFileImageFromMemory(%p, 0x%0lX, %p)\n", memImage, memImageSize, ofi);
  93
  94     // sanity check the buffer is a mach-o file
  95     __block Diagnostics diag;
  96
  97         // check if it is current arch mach-o or fat with slice for current arch
  98     bool usable = false;
  99     const MachOFile* mf = (MachOFile*)memImage;
 100     if ( mf->hasMachOMagic() && mf->isMachO(diag, memImageSize) ) {
 101         usable = (gAllImages.archs().grade(mf->cputype, mf->cpusubtype) != 0);
 102     }
 103     else if ( const FatFile* ff = FatFile::isFatFile(memImage) ) {
 104         uint64_t sliceOffset;
 105         uint64_t sliceLen;
 106         bool     missingSlice;
 107         if ( ff->isFatFileWithSlice(diag, memImageSize, gAllImages.archs(), sliceOffset, sliceLen, missingSlice) ) {
 108             mf = (MachOFile*)((long)memImage+sliceOffset);
 109             if ( mf->isMachO(diag, sliceLen) ) {
 110                 usable = true;
 111             }
 112         }
 113     }
 114     if ( usable ) {
 115         if ( !mf->supportsPlatform(Platform::macOS) )
 116             usable = false;
 117     }
 118     if ( !usable ) {
 119         log_apis("NSCreateObjectFileImageFromMemory() not mach-o\n");
 120         return NSObjectFileImageFailure;
 121     }
 122
 123     // this API can only be used with bundles
 124     if ( !mf->isBundle() ) {
 125         log_apis("NSCreateObjectFileImageFromMemory() not a bundle\n");
 126         return NSObjectFileImageInappropriateFile;
 127     }
 128
 129     // allocate ofi that just lists the memory range
 130     OFIInfo result;
 131     result.path        = nullptr;
 132     result.memSource   = memImage;
 133     result.memLength   = memImageSize;
 134     result.loadAddress = nullptr;
 135     result.imageNum    = 0;
 136     *ofi = gAllImages.addNSObjectFileImage(result);
 137
 138     log_apis("NSCreateObjectFileImageFromMemory() => %p\n", *ofi);
 139
 140     return NSObjectFileImageSuccess;
 141 }
 142
 143 NSModule NSLinkModule(NSObjectFileImage ofi, const char* moduleName, uint32_t options)
 144 {
 145     DYLD_LOAD_LOCK_THIS_BLOCK
 146     log_apis("NSLinkModule(%p, \"%s\", 0x%08X)\n", ofi, moduleName, options);
 147
 148     __block const char* path = nullptr;
 149     bool foundImage = gAllImages.forNSObjectFileImage(ofi, ^(OFIInfo &image) {
 150         // if this is memory based image, write to temp file, then use file based loading
 151         if ( image.memSource != nullptr ) {
 152             // make temp file with content of memory buffer
 153             image.path = nullptr;
 154             char tempFileName[PATH_MAX];
 155             const char* tmpDir = getenv("TMPDIR");
 156             if ( (tmpDir != nullptr) && (strlen(tmpDir) > 2) ) {
 157                 strlcpy(tempFileName, tmpDir, PATH_MAX);
 158                 if ( tmpDir[strlen(tmpDir)-1] != '/' )
 159                     strlcat(tempFileName, "/", PATH_MAX);
 160             }
 161             else
 162                 strlcpy(tempFileName,"/tmp/", PATH_MAX);
 163             strlcat(tempFileName, "NSCreateObjectFileImageFromMemory-XXXXXXXX", PATH_MAX);
 164             int fd = ::mkstemp(tempFileName);
 165             if ( fd != -1 ) {
 166                 ssize_t writtenSize = ::pwrite(fd, image.memSource, image.memLength, 0);
 167                 if ( writtenSize == image.memLength ) {
 168                     image.path = strdup(tempFileName);
 169                 }
 170                 else {
 171                     log_apis("NSLinkModule() => NULL (could not save memory image to temp file)\n");
 172                 }
 173                 ::close(fd);
 174             }
 175         }
 176         path = image.path;
 177     });
 178
 179     if (!foundImage) {
 180         // ofi is invalid if not in list
 181         log_apis("NSLinkModule() => NULL (invalid NSObjectFileImage)\n");
 182         return nullptr;
 183     }
 184
 185     if (!path)
 186         return nullptr;
 187
 188     // dlopen the binary outside of the read lock as we don't want to risk deadlock
 189     Diagnostics diag;
 190     void* callerAddress = __builtin_return_address(1); // note layers: 1: real client, 0: libSystem glue
 191     const MachOLoaded* loadAddress = gAllImages.dlopen(diag, path, false, false, false, false, true, callerAddress);
 192     if ( diag.hasError() ) {
 193         log_apis("   NSLinkModule: failed: %s\n", diag.errorMessage());
 194         return nullptr;
 195     }
 196
 197     // Now update the load address of this object
 198     gAllImages.forNSObjectFileImage(ofi, ^(OFIInfo &image) {
 199         image.loadAddress = loadAddress;
 200
 201         // if memory based load, delete temp file
 202         if ( image.memSource != nullptr ) {
 203             log_apis("   NSLinkModule: delete temp file: %s\n", image.path);
 204             ::unlink(image.path);
 205         }
 206     });
 207
 208     log_apis("NSLinkModule() => %p\n", loadAddress);
 209     return (NSModule)loadAddress;
 210 }
 211
 212 // NSUnLinkModule unmaps the image, but does not release the NSObjectFileImage
 213 bool NSUnLinkModule(NSModule module, uint32_t options)
 214 {
 215     DYLD_LOAD_LOCK_THIS_BLOCK
 216     log_apis("NSUnLinkModule(%p, 0x%08X)\n", module, options);
 217
 218     __block const mach_header* mh = nullptr;
 219     gAllImages.infoForImageMappedAt(module, ^(const LoadedImage& foundImage, uint8_t permissions) {
 220         mh = foundImage.loadedAddress();
 221     });
 222
 223     if ( mh != nullptr )
 224         gAllImages.decRefCount(mh); // removes image if reference count went to zero
 225
 226     log_apis("NSUnLinkModule() => %d\n", mh != nullptr);
 227
 228     return mh != nullptr;
 229 }
 230
 231 // NSDestroyObjectFileImage releases the NSObjectFileImage, but the mapped image may remain in use
 232 bool NSDestroyObjectFileImage(NSObjectFileImage imageHandle)
 233 {
 234     log_apis("NSDestroyObjectFileImage(%p)\n", imageHandle);
 235
 236     __block const void* memSource = nullptr;
 237     __block size_t      memLength = 0;
 238     __block const char* path      = nullptr;
 239     bool foundImage = gAllImages.forNSObjectFileImage(imageHandle, ^(OFIInfo &image) {
 240         // keep copy of info
 241         memSource = image.memSource;
 242         memLength = image.memLength;
 243         path      = image.path;
 244     });
 245
 246     if (!foundImage)
 247         return false;
 248
 249     // remove from list
 250     gAllImages.removeNSObjectFileImage(imageHandle);
 251
 252     // if object was created from a memory, release that memory
 253     // NOTE: this is the way dyld has always done this. NSCreateObjectFileImageFromMemory() hands ownership of the memory to dyld
 254     if ( memSource != nullptr ) {
 255         // we don't know if memory came from malloc or vm_allocate, so ask malloc
 256         if ( malloc_size(memSource) != 0 )
 257             free((void*)(memSource));
 258         else
 259             vm_deallocate(mach_task_self(), (vm_address_t)memSource, memLength);
 260     }
 261     free((void*)path);
 262
 263     return true;
 264 }
 265
 266 uint32_t NSSymbolDefinitionCountInObjectFileImage(NSObjectFileImage objectFileImage)
 267 {
 268     halt("NSSymbolDefinitionCountInObjectFileImage() is obsolete");
 269 }
 270
 271 const char* NSSymbolDefinitionNameInObjectFileImage(NSObjectFileImage objectFileImage, uint32_t ordinal)
 272 {
 273     halt("NSSymbolDefinitionNameInObjectFileImage() is obsolete");
 274 }
 275
 276 uint32_t NSSymbolReferenceCountInObjectFileImage(NSObjectFileImage objectFileImage)
 277 {
 278     halt("NSSymbolReferenceCountInObjectFileImage() is obsolete");
 279 }
 280
 281 const char* NSSymbolReferenceNameInObjectFileImage(NSObjectFileImage objectFileImage, uint32_t ordinal, bool *tentative_definition)
 282 {
 283     halt("NSSymbolReferenceNameInObjectFileImage() is obsolete");
 284 }
 285
 286 bool NSIsSymbolDefinedInObjectFileImage(NSObjectFileImage imageHandle, const char* symbolName)
 287 {
 288     log_apis("NSIsSymbolDefinedInObjectFileImage(%p, %s)\n", imageHandle, symbolName);
 289
 290     __block bool hasSymbol = false;
 291     bool foundImage = gAllImages.forNSObjectFileImage(imageHandle, ^(OFIInfo &image) {
 292         void* addr;
 293         bool resultPointsToInstructions = false;
 294         hasSymbol = image.loadAddress->hasExportedSymbol(symbolName, nullptr, &addr, &resultPointsToInstructions);
 295     });
 296
 297     // ofi is invalid if not in list
 298     if (!foundImage)
 299         return false;
 300
 301     return hasSymbol;
 302 }
 303
 304 void* NSGetSectionDataInObjectFileImage(NSObjectFileImage imageHandle, const char* segmentName, const char* sectionName, size_t* size)
 305 {
 306     __block const void* result = nullptr;
 307     bool foundImage = gAllImages.forNSObjectFileImage(imageHandle, ^(OFIInfo &image) {
 308         uint64_t sz;
 309         result = image.loadAddress->findSectionContent(segmentName, sectionName, sz);
 310         *size = (size_t)sz;
 311     });
 312
 313     // ofi is invalid if not in list
 314     if (!foundImage)
 315         return nullptr;
 316
 317         return (void*)result;
 318 }
 319
 320 const char* NSNameOfModule(NSModule m)
 321 {
 322     log_apis("NSNameOfModule(%p)\n", m);
 323
 324     __block const char* result = nullptr;
 325     gAllImages.infoForImageMappedAt(m, ^(const LoadedImage& foundImage, uint8_t permissions) {
 326         result = gAllImages.imagePath(foundImage.image());
 327     });
 328
 329     return result;
 330 }
 331
 332 const char* NSLibraryNameForModule(NSModule m)
 333 {
 334     log_apis("NSLibraryNameForModule(%p)\n", m);
 335
 336      __block const char* result = nullptr;
 337     gAllImages.infoForImageMappedAt(m, ^(const LoadedImage& foundImage, uint8_t permissions) {
 338         result = gAllImages.imagePath(foundImage.image());
 339     });
 340     return result;
 341  }
 342
 343
 344 static bool flatFindSymbol(const char* symbolName, void** symbolAddress, const mach_header** foundInImageAtLoadAddress)
 345 {
 346     __block bool result = false;
 347     gAllImages.forEachImage(^(const LoadedImage& loadedImage, bool& stop) {
 348         bool resultPointsToInstructions = false;
 349         if ( loadedImage.loadedAddress()->hasExportedSymbol(symbolName, nullptr, symbolAddress, &resultPointsToInstructions) ) {
 350             *foundInImageAtLoadAddress = loadedImage.loadedAddress();
 351             stop = true;
 352             result = true;
 353         }
 354     });
 355     return result;
 356 }
 357
 358 bool NSIsSymbolNameDefined(const char* symbolName)
 359 {
 360     log_apis("NSIsSymbolNameDefined(%s)\n", symbolName);
 361
 362     const mach_header* foundInImageAtLoadAddress;
 363     void* address;
 364     return flatFindSymbol(symbolName, &address, &foundInImageAtLoadAddress);
 365 }
 366
 367 bool NSIsSymbolNameDefinedWithHint(const char* symbolName, const char* libraryNameHint)
 368 {
 369     log_apis("NSIsSymbolNameDefinedWithHint(%s, %s)\n", symbolName, libraryNameHint);
 370
 371     const mach_header* foundInImageAtLoadAddress;
 372     void* address;
 373     return flatFindSymbol(symbolName, &address, &foundInImageAtLoadAddress);
 374 }
 375
 376 bool NSIsSymbolNameDefinedInImage(const struct mach_header* mh, const char* symbolName)
 377 {
 378     log_apis("NSIsSymbolNameDefinedInImage(%p, %s)\n", mh, symbolName);
 379
 380     void* addr;
 381     bool resultPointsToInstructions = false;
 382     return ((MachOLoaded*)mh)->hasExportedSymbol(symbolName, nullptr, &addr, &resultPointsToInstructions);
 383 }
 384
 385 NSSymbol NSLookupAndBindSymbol(const char* symbolName)
 386 {
 387     log_apis("NSLookupAndBindSymbol(%s)\n", symbolName);
 388
 389     const mach_header* foundInImageAtLoadAddress;
 390     void* symbolAddress;
 391     if ( flatFindSymbol(symbolName, &symbolAddress, &foundInImageAtLoadAddress) ) {
 392         return (NSSymbol)symbolAddress;
 393     }
 394     return nullptr;
 395 }
 396
 397 NSSymbol NSLookupAndBindSymbolWithHint(const char* symbolName, const char* libraryNameHint)
 398 {
 399     log_apis("NSLookupAndBindSymbolWithHint(%s, %s)\n", symbolName, libraryNameHint);
 400
 401     const mach_header* foundInImageAtLoadAddress;
 402     void* symbolAddress;
 403     if ( flatFindSymbol(symbolName, &symbolAddress, &foundInImageAtLoadAddress) ) {
 404         return (NSSymbol)symbolAddress;
 405     }
 406     return nullptr;
 407 }
 408
 409 NSSymbol NSLookupSymbolInModule(NSModule module, const char* symbolName)
 410 {
 411     log_apis("NSLookupSymbolInModule(%p. %s)\n", module, symbolName);
 412
 413     const MachOLoaded* mh = (const MachOLoaded*)module;
 414     void* addr;
 415     bool resultPointsToInstructions = false;
 416     if ( mh->hasExportedSymbol(symbolName, nullptr, &addr, &resultPointsToInstructions) ) {
 417         return (NSSymbol)addr;
 418     }
 419     return nullptr;
 420 }
 421
 422 NSSymbol NSLookupSymbolInImage(const mach_header* mh, const char* symbolName, uint32_t options)
 423 {
 424     log_apis("NSLookupSymbolInImage(%p, \"%s\", 0x%08X)\n", mh, symbolName, options);
 425
 426     void* addr;
 427     bool resultPointsToInstructions = false;
 428         if ( ((MachOLoaded*)mh)->hasExportedSymbol(symbolName, nullptr, &addr, &resultPointsToInstructions) ) {
 429         log_apis("   NSLookupSymbolInImage() => %p\n", addr);
 430         return (NSSymbol)addr;
 431         }
 432     if ( options & NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR ) {
 433         log_apis("   NSLookupSymbolInImage() => NULL\n");
 434         return nullptr;
 435     }
 436     // FIXME: abort();
 437     return nullptr;
 438 }
 439
 440 const char* NSNameOfSymbol(NSSymbol symbol)
 441 {
 442     halt("NSNameOfSymbol() is obsolete");
 443 }
 444
 445 void* NSAddressOfSymbol(NSSymbol symbol)
 446 {
 447     log_apis("NSAddressOfSymbol(%p)\n", symbol);
 448
 449     // in dyld 1.0, NSSymbol was a pointer to the nlist entry in the symbol table
 450     return (void*)symbol;
 451 }
 452
 453 NSModule NSModuleForSymbol(NSSymbol symbol)
 454 {
 455     log_apis("NSModuleForSymbol(%p)\n", symbol);
 456
 457     __block NSModule result = nullptr;
 458     gAllImages.infoForImageMappedAt(symbol, ^(const LoadedImage& foundImage, uint8_t permissions) {
 459         result = (NSModule)foundImage.loadedAddress();
 460     });
 461
 462     return result;
 463 }
 464
 465 void NSLinkEditError(NSLinkEditErrors *c, int *errorNumber, const char** fileName, const char** errorString)
 466 {
 467     log_apis("NSLinkEditError(%p, %p, %p, %p)\n", c, errorNumber, fileName, errorString);
 468     *c = NSLinkEditOtherError;
 469     *errorNumber = 0;
 470     *fileName = NULL;
 471     *errorString = NULL;
 472 }
 473
 474 bool NSAddLibrary(const char* pathName)
 475 {
 476     log_apis("NSAddLibrary(%s)\n", pathName);
 477
 478     void* callerAddress = __builtin_return_address(1); // note layers: 1: real client, 0: libSystem glue
 479     return ( dlopen_internal(pathName, 0, callerAddress) != nullptr);
 480 }
 481
 482 bool NSAddLibraryWithSearching(const char* pathName)
 483 {
 484     log_apis("NSAddLibraryWithSearching(%s)\n", pathName);
 485
 486     void* callerAddress = __builtin_return_address(1); // note layers: 1: real client, 0: libSystem glue
 487     return ( dlopen_internal(pathName, 0, callerAddress) != nullptr);
 488 }
 489
 490 const mach_header* NSAddImage(const char* imageName, uint32_t options)
 491 {
 492     log_apis("NSAddImage(\"%s\", 0x%08X)\n", imageName, options);
 493
 494     // Note: this is a quick and dirty implementation that just uses dlopen() and ignores some option flags
 495     uint32_t dloptions = 0;
 496     if ( (options & NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED) != 0 )
 497         dloptions |= RTLD_NOLOAD;
 498
 499     void* callerAddress = __builtin_return_address(1); // note layers: 1: real client, 0: libSystem glue
 500     void* h = dlopen_internal(imageName, dloptions, callerAddress);
 501     if ( h != nullptr ) {
 502         const MachOLoaded* mh;
 503         bool dontContinue;
 504         parseDlHandle(h, &mh, &dontContinue);
 505         return mh;
 506     }
 507
 508     if ( (options & (NSADDIMAGE_OPTION_RETURN_ON_ERROR|NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED)) == 0 ) {
 509         halt("NSAddImage() image not found");
 510     }
 511     return nullptr;
 512 }
 513
 514 void NSInstallLinkEditErrorHandlers(const NSLinkEditErrorHandlers *handlers)
 515 {
 516     halt("NSInstallLinkEditErrorHandlers() is obsolete");
 517 }
 518
 519 bool _dyld_present(void)
 520 {
 521     log_apis("_dyld_present()\n");
 522
 523     return true;
 524 }
 525
 526 bool _dyld_launched_prebound(void)
 527 {
 528     halt("_dyld_launched_prebound() is obsolete");
 529 }
 530
 531 bool _dyld_all_twolevel_modules_prebound(void)
 532 {
 533     halt("_dyld_all_twolevel_modules_prebound() is obsolete");
 534 }
 535
 536 bool _dyld_bind_fully_image_containing_address(const void* address)
 537 {
 538     log_apis("_dyld_bind_fully_image_containing_address(%p)\n", address);
 539
 540     // in dyld3, everything is always fully bound
 541     return true;
 542 }
 543
 544 bool _dyld_image_containing_address(const void* address)
 545 {
 546     log_apis("_dyld_image_containing_address(%p)\n", address);
 547
 548     return (dyld_image_header_containing_address(address) != nullptr);
 549 }
 550
 551 void _dyld_lookup_and_bind(const char* symbolName, void **address, NSModule* module)
 552 {
 553     log_apis("_dyld_lookup_and_bind(%s, %p, %p)\n", symbolName, address, module);
 554
 555     const mach_header* foundInImageAtLoadAddress;
 556     if ( flatFindSymbol(symbolName, address, &foundInImageAtLoadAddress) ) {
 557         *module = (NSModule)foundInImageAtLoadAddress;
 558         return;
 559     }
 560
 561     *address = 0;
 562     *module = 0;
 563 }
 564
 565 void _dyld_lookup_and_bind_with_hint(const char* symbolName, const char* libraryNameHint, void** address, NSModule* module)
 566 {
 567     log_apis("_dyld_lookup_and_bind_with_hint(%s, %s, %p, %p)\n", symbolName, libraryNameHint, address, module);
 568
 569     const mach_header* foundInImageAtLoadAddress;
 570     if ( flatFindSymbol(symbolName, address, &foundInImageAtLoadAddress) ) {
 571         *module = (NSModule)foundInImageAtLoadAddress;
 572         return;
 573     }
 574
 575     *address = 0;
 576     *module = 0;
 577 }
 578
 579
 580 void _dyld_lookup_and_bind_fully(const char* symbolName, void** address, NSModule* module)
 581 {
 582     log_apis("_dyld_lookup_and_bind_fully(%s, %p, %p)\n", symbolName, address, module);
 583
 584     const mach_header* foundInImageAtLoadAddress;
 585     if ( flatFindSymbol(symbolName, address, &foundInImageAtLoadAddress) ) {
 586         *module = (NSModule)foundInImageAtLoadAddress;
 587         return;
 588     }
 589
 590     *address = 0;
 591     *module = 0;
 592 }
 593
 594 const struct mach_header* _dyld_get_image_header_containing_address(const void* address)
 595 {
 596     log_apis("_dyld_get_image_header_containing_address(%p)\n", address);
 597
 598     return dyld_image_header_containing_address(address);
 599 }
 600
 601 #endif
 602
 603
 604 } // namespace dyld3
 605