src/dyld.h

   1 /* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
   2  *
   3  * Copyright (c) 2004-2009 Apple Inc. All rights reserved.
   4  *
   5  * @APPLE_LICENSE_HEADER_START@
   6  *
   7  * This file contains Original Code and/or Modifications of Original Code
   8  * as defined in and that are subject to the Apple Public Source License
   9  * Version 2.0 (the 'License'). You may not use this file except in
  10  * compliance with the License. Please obtain a copy of the License at
  11  * http://www.opensource.apple.com/apsl/ and read it before using this
  12  * file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  19  * Please see the License for the specific language governing rights and
  20  * limitations under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24
  25 #include <stdint.h>
  26 #include <sys/stat.h>
  27 #include <dlfcn.h>
  28
  29 #include "ImageLoader.h"
  30 #include "mach-o/dyld_priv.h"
  31
  32
  33
  34 //
  35 // dyld functions available when implementing dyld API's
  36 //
  37 //
  38 namespace dyld {
  39
  40         struct LoadContext
  41         {
  42                 bool                    useSearchPaths;
  43                 bool                    useFallbackPaths;
  44                 bool                    useLdLibraryPath;
  45                 bool                    implicitRPath;
  46                 bool                    matchByInstallName;
  47                 bool                    dontLoad;
  48                 bool                    mustBeBundle;
  49                 bool                    mustBeDylib;
  50                 bool                    canBePIE;
  51                 const char*                                             origin;                 // path for expanding @loader_path
  52                 const ImageLoader::RPathChain*  rpath;                  // paths for expanding @rpath
  53         };
  54
  55
  56
  57         typedef void             (*ImageCallback)(const struct mach_header* mh, intptr_t slide);
  58         typedef void             (*UndefinedHandler)(const char* symbolName);
  59         typedef const char*      (*ImageLocator)(const char* dllName);
  60
  61
  62         extern ImageLoader::LinkContext                 gLinkContext;
  63         extern struct dyld_all_image_infos*             gProcessInfo;
  64         extern bool                                                             gLogAPIs;
  65 #if SUPPORT_ACCELERATE_TABLES
  66         extern bool                                                             gLogAppAPIs;
  67 #endif
  68 #if DYLD_SHARED_CACHE_SUPPORT
  69         extern bool                                                             gSharedCacheOverridden;
  70 #endif
  71         extern const struct LibSystemHelpers*   gLibSystemHelpers;
  72 #if SUPPORT_OLD_CRT_INITIALIZATION
  73         extern bool                                                             gRunInitializersOldWay;
  74 #endif
  75         extern void                                     registerAddCallback(ImageCallback func);
  76         extern void                                     registerRemoveCallback(ImageCallback func);
  77         extern void                                     registerUndefinedHandler(UndefinedHandler);
  78         extern void                                     initializeMainExecutable();
  79         extern void                                     preflight(ImageLoader* image, const ImageLoader::RPathChain& loaderRPaths, unsigned cacheIndex);
  80         extern void                                     link(ImageLoader* image, bool forceLazysBound, bool neverUnload, const ImageLoader::RPathChain& loaderRPaths, unsigned cacheIndex);
  81         extern void                                     runInitializers(ImageLoader* image);
  82         extern void                                     runImageStaticTerminators(ImageLoader* image);
  83         extern const char*                      getExecutablePath();
  84         extern bool                                     validImage(const ImageLoader*);
  85         extern ImageLoader*                     getIndexedImage(uint32_t index);
  86         extern uint32_t                         getImageCount();
  87         extern ImageLoader*                     findImageByMachHeader(const struct mach_header* target);
  88         extern ImageLoader*                     findImageContainingAddress(const void* addr);
  89         extern ImageLoader*                     findImageContainingSymbol(const void* symbol);
  90         extern ImageLoader*                     findImageByName(const char* path);
  91         extern ImageLoader*                     findLoadedImageByInstallPath(const char* path);
  92         extern bool                                     flatFindExportedSymbol(const char* name, const ImageLoader::Symbol** sym, const ImageLoader** image);
  93         extern bool                                     flatFindExportedSymbolWithHint(const char* name, const char* librarySubstring, const ImageLoader::Symbol** sym, const ImageLoader** image);
  94         extern ImageLoader*                     load(const char* path, const LoadContext& context, unsigned& cacheIndex);
  95         extern ImageLoader*                     loadFromMemory(const uint8_t* mem, uint64_t len, const char* moduleName);
  96         extern void                                     removeImage(ImageLoader* image);
  97         extern ImageLoader*                     cloneImage(ImageLoader* image);
  98         extern void                                     forEachImageDo( void (*)(ImageLoader*, void*), void*);
  99         extern uintptr_t                        _main(const macho_header* mainExecutableMH, uintptr_t mainExecutableSlide, int argc, const char* argv[], const char* envp[],
 100                                                                           const char* apple[], uintptr_t* startGlue) __attribute__((noinline));  // <rdar://problem/113
 101         extern void                                     halt(const char* message)  __attribute__((noreturn));
 102         extern void                                     setErrorMessage(const char* msg);
 103         extern const char*                      getErrorMessage();
 104         extern void                                     clearErrorMessage();
 105         extern bool                                     mainExecutablePrebound();
 106         extern ImageLoader*                     mainExecutable();
 107         extern void                                     processDyldEnvironmentVariable(const char* key, const char* value, const char* mainDir);
 108         extern void                                     registerImageStateSingleChangeHandler(dyld_image_states state, dyld_image_state_change_handler handler);
 109         extern void                                     registerImageStateBatchChangeHandler(dyld_image_states state, dyld_image_state_change_handler handler);
 110         extern void                                     registerObjCNotifiers(_dyld_objc_notify_mapped, _dyld_objc_notify_init, _dyld_objc_notify_unmapped);
 111         extern bool                                     sharedCacheUUID(uuid_t uuid);
 112         extern void                                     garbageCollectImages();
 113         extern int                                      openSharedCacheFile();
 114         extern const void*                      imMemorySharedCacheHeader();
 115         extern uintptr_t                        fastBindLazySymbol(ImageLoader** imageLoaderCache, uintptr_t lazyBindingInfoOffset);
 116 #if DYLD_SHARED_CACHE_SUPPORT
 117         extern bool                                     inSharedCache(const char* path);
 118 #endif
 119 #if LOG_BINDINGS
 120         extern void                                     logBindings(const char* format, ...);
 121 #endif
 122         extern bool                                     processIsRestricted();
 123         extern const char*                      getStandardSharedCacheFilePath();
 124         extern int                                      my_stat(const char* path, struct stat* buf);
 125         extern int                                      my_open(const char* path, int flag, int other);
 126         bool                                            sandboxBlockedOpen(const char* path);
 127         bool                                            sandboxBlockedMmap(const char* path);
 128         bool                                            sandboxBlockedStat(const char* path);
 129
 130 #if SUPPORT_ACCELERATE_TABLES
 131         bool                                            dlopenFromCache(const char* path, int mode, void** handle);
 132         bool                                            makeCacheHandle(ImageLoader* image, unsigned cacheIndex, int mode, void** result);
 133         void*                                           dlsymFromCache(void* handle, const char* symName, unsigned index);
 134         bool                                            isCacheHandle(void* handle);
 135         bool                                            addressInCache(const void* address, const mach_header** mh, const char** path, unsigned* index=NULL);
 136         bool                                            findUnwindSections(const void* addr, dyld_unwind_sections* info);
 137         bool                                            dladdrFromCache(const void* address, Dl_info* info);
 138         bool                                            isPathInCache(const char* path);
 139         const char*                                     getPathFromIndex(unsigned cacheIndex);
 140 #endif
 141 }
 142