src/ImageLoaderMachO.h

   1 /* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
   2  *
   3  * Copyright (c) 2004-2009 Apple Inc. All rights reserved.
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   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
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  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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  24
  25
  26 #ifndef __IMAGELOADERMACHO__
  27 #define __IMAGELOADERMACHO__
  28
  29 #include <stdint.h>
  30 #include <mach-o/loader.h>
  31 #include <mach-o/nlist.h>
  32
  33 #include "ImageLoader.h"
  34 #include "mach-o/dyld_images.h"
  35
  36
  37 //
  38 // ImageLoaderMachO is a subclass of ImageLoader which loads mach-o format files.
  39 //
  40 //
  41 class ImageLoaderMachO : public ImageLoader {
  42 public:
  43         static ImageLoader*                                     instantiateMainExecutable(const macho_header* mh, uintptr_t slide, const char* path, const LinkContext& context);
  44         static ImageLoader*                                     instantiateFromFile(const char* path, int fd, const uint8_t firstPages[], size_t firstPagesSize, uint64_t offsetInFat,
  45                                                                                                                         uint64_t lenInFat, const struct stat& info, const LinkContext& context);
  46         static ImageLoader*                                     instantiateFromCache(const macho_header* mh, const char* path, long slide, const struct stat& info, const LinkContext& context);
  47         static ImageLoader*                                     instantiateFromMemory(const char* moduleName, const macho_header* mh, uint64_t len, const LinkContext& context);
  48
  49
  50         bool                                                            inSharedCache() const { return fInSharedCache; }
  51         void                                                            disableCoverageCheck() { fCoveredCodeLength = UINT64_MAX; }
  52
  53         const char*                                                     getInstallPath() const;
  54         virtual void*                                           getMain() const;
  55         virtual void*                                           getThreadPC() const;
  56         virtual const struct mach_header*   machHeader() const;
  57         virtual uintptr_t                                       getSlide() const;
  58         virtual const void*                                     getEnd() const;
  59         virtual bool                                            hasCoalescedExports() const;
  60         virtual const Symbol*                           findExportedSymbol(const char* name, bool searchReExports, const char* thisPath, const ImageLoader** foundIn) const;
  61         virtual uintptr_t                                       getExportedSymbolAddress(const Symbol* sym, const LinkContext& context,
  62                                                                                                                                 const ImageLoader* requestor, bool runResolver, const char*) const;
  63         virtual DefinitionFlags                         getExportedSymbolInfo(const Symbol* sym) const;
  64         virtual const char*                                     getExportedSymbolName(const Symbol* sym) const;
  65         virtual uint32_t                                        getExportedSymbolCount() const;
  66         virtual const Symbol*                           getIndexedExportedSymbol(uint32_t index) const;
  67         virtual uint32_t                                        getImportedSymbolCount() const;
  68         virtual const Symbol*                           getIndexedImportedSymbol(uint32_t index) const;
  69         virtual ReferenceFlags                          getImportedSymbolInfo(const Symbol* sym) const;
  70         virtual const char*                                     getImportedSymbolName(const Symbol* sym) const;
  71         virtual bool                                            isBundle() const;
  72         virtual bool                                            isDylib() const;
  73         virtual bool                                            isExecutable() const;
  74         virtual bool                                            isPositionIndependentExecutable() const;
  75         virtual bool                                            forceFlat() const;
  76         virtual bool                                            participatesInCoalescing() const;
  77         virtual const char*                                     findClosestSymbol(const void* addr, const void** closestAddr) const = 0;
  78         virtual void                                            initializeCoalIterator(CoalIterator&, unsigned int loadOrder, unsigned) = 0;
  79         virtual bool                                            incrementCoalIterator(CoalIterator&) = 0;
  80         virtual uintptr_t                                       getAddressCoalIterator(CoalIterator&, const LinkContext& contex) = 0;
  81         virtual void                                            updateUsesCoalIterator(CoalIterator&, uintptr_t newAddr, ImageLoader* target, unsigned targetIndex, const LinkContext& context) = 0;
  82         virtual uintptr_t                                       doBindLazySymbol(uintptr_t* lazyPointer, const LinkContext& context) = 0;
  83         virtual uintptr_t                                       doBindFastLazySymbol(uint32_t lazyBindingInfoOffset, const LinkContext& context, void (*lock)(), void (*unlock)()) = 0;
  84         virtual void                                            doTermination(const LinkContext& context);
  85         virtual bool                                            needsInitialization();
  86         virtual bool                                            getSectionContent(const char* segmentName, const char* sectionName, void** start, size_t* length);
  87         virtual void                                            getUnwindInfo(dyld_unwind_sections* info);
  88         virtual bool                                            findSection(const void* imageInterior, const char** segmentName, const char** sectionName, size_t* sectionOffset);
  89         virtual bool                                            usablePrebinding(const LinkContext& context) const;
  90         virtual unsigned int                            segmentCount() const;
  91         virtual const char*                                     segName(unsigned int) const;
  92         virtual uintptr_t                                       segSize(unsigned int) const;
  93         virtual uintptr_t                                       segFileSize(unsigned int) const;
  94         virtual bool                                            segHasTrailingZeroFill(unsigned int);
  95         virtual uintptr_t                                       segFileOffset(unsigned int) const;
  96         virtual bool                                            segReadable(unsigned int) const;
  97         virtual bool                                            segWriteable(unsigned int) const;
  98         virtual bool                                            segExecutable(unsigned int) const;
  99         virtual bool                                            segUnaccessible(unsigned int) const;
 100         virtual bool                                            segHasPreferredLoadAddress(unsigned int) const;
 101         virtual uintptr_t                                       segActualLoadAddress(unsigned int) const;
 102         virtual uintptr_t                                       segPreferredLoadAddress(unsigned int) const;
 103         virtual uintptr_t                                       segActualEndAddress(unsigned int) const;
 104         virtual void                                            registerInterposing();
 105         virtual uint32_t                                        sdkVersion() const;
 106         virtual uint32_t                                        minOSVersion() const;
 107         virtual const char*                                     libPath(unsigned int) const;
 108         virtual bool                                            notifyObjC() const { return fNotifyObjC; }
 109
 110         static void                                                     printStatisticsDetails(unsigned int imageCount, const InitializerTimingList&);
 111         static uint32_t                                         minOSVersion(const mach_header*);
 112         static uint32_t                                         sdkVersion(const mach_header* mh);
 113         static intptr_t                                         computeSlide(const mach_header* mh);
 114         static bool                                                     findSection(const mach_header* mh, const char* segmentName, const char* sectionName, void** sectAddress, uintptr_t* sectSize);
 115         static const dyld_info_command*         findDyldInfoLoadCommand(const mach_header* mh);
 116         static const char*                                      findClosestSymbol(const mach_header* mh, const void* addr, const void** closestAddr);
 117         static bool                                                     getLazyBindingInfo(uint32_t& lazyBindingInfoOffset, const uint8_t* lazyInfoStart, const uint8_t* lazyInfoEnd,
 118                                                                                                                   uint8_t* segIndex, uintptr_t* segOffset, int* ordinal, const char** symbolName, bool* doneAfterBind);
 119         static uintptr_t                                        segPreferredAddress(const mach_header* mh, unsigned segIndex);
 120         static uintptr_t                                        bindLocation(const LinkContext& context, uintptr_t location, uintptr_t value,
 121                                                                                                         uint8_t type, const char* symbolName,
 122                                                                                                         intptr_t addend, const char* inPath, const char* toPath, const char* msg);
 123         virtual void                                            rebase(const LinkContext& context, uintptr_t slide) = 0;
 124
 125
 126
 127 protected:
 128                                                 ImageLoaderMachO(const ImageLoaderMachO&);
 129                                                 ImageLoaderMachO(const macho_header* mh, const char* path, unsigned int segCount,
 130                                                                                                                                         uint32_t segOffsets[], unsigned int libCount);
 131         virtual                         ~ImageLoaderMachO() {}
 132
 133         void                            operator=(const ImageLoaderMachO&);
 134
 135         virtual void                                            setDyldInfo(const struct dyld_info_command*) = 0;
 136         virtual void                                            setSymbolTableInfo(const macho_nlist*, const char*, const dysymtab_command*) = 0;
 137         virtual bool                                            isSubframeworkOf(const LinkContext& context, const ImageLoader* image) const = 0;
 138         virtual bool                                            hasSubLibrary(const LinkContext& context, const ImageLoader* child) const = 0;
 139         virtual uint32_t*                                       segmentCommandOffsets() const = 0;
 140         virtual const ImageLoader::Symbol*      findShallowExportedSymbol(const char* name, const ImageLoader** foundIn) const = 0;
 141         virtual bool                                            containsSymbol(const void* addr) const = 0;
 142         virtual uintptr_t                                       exportedSymbolAddress(const LinkContext& context, const Symbol* symbol, const ImageLoader* requestor, bool runResolver) const = 0;
 143         virtual bool                                            exportedSymbolIsWeakDefintion(const Symbol* symbol) const = 0;
 144         virtual const char*                                     exportedSymbolName(const Symbol* symbol) const = 0;
 145         virtual unsigned int                            exportedSymbolCount() const = 0;
 146         virtual const ImageLoader::Symbol*      exportedSymbolIndexed(unsigned int) const = 0;
 147         virtual unsigned int                            importedSymbolCount() const = 0;
 148         virtual const ImageLoader::Symbol*      importedSymbolIndexed(unsigned int) const = 0;
 149         virtual const char*                                     importedSymbolName(const Symbol* symbol) const = 0;
 150 #if PREBOUND_IMAGE_SUPPORT
 151         virtual void                                            resetPreboundLazyPointers(const LinkContext& context) = 0;
 152 #endif
 153
 154
 155         virtual void            doGetDependentLibraries(DependentLibraryInfo libs[]);
 156         virtual LibraryInfo doGetLibraryInfo(const LibraryInfo& requestorInfo);
 157         virtual void            getRPaths(const LinkContext& context, std::vector<const char*>&) const;
 158         virtual bool            getUUID(uuid_t) const;
 159         virtual void            doRebase(const LinkContext& context);
 160         virtual void            doBind(const LinkContext& context, bool forceLazysBound) = 0;
 161         virtual void            doBindJustLazies(const LinkContext& context) = 0;
 162         virtual bool            doInitialization(const LinkContext& context);
 163         virtual void            doGetDOFSections(const LinkContext& context, std::vector<ImageLoader::DOFInfo>& dofs);
 164         virtual bool            needsTermination();
 165         virtual bool            segmentsMustSlideTogether() const;
 166         virtual bool            segmentsCanSlide() const;
 167         virtual void            setSlide(intptr_t slide);
 168         virtual bool            usesTwoLevelNameSpace() const;
 169         virtual bool            isPrebindable() const;
 170
 171 protected:
 172
 173                         void            destroy();
 174         static void                     sniffLoadCommands(const macho_header* mh, const char* path, bool inCache, bool* compressed,
 175                                                                                         unsigned int* segCount, unsigned int* libCount, const LinkContext& context,
 176                                                                                         const linkedit_data_command** codeSigCmd,
 177                                                                                         const encryption_info_command** encryptCmd);
 178         static bool                     needsAddedLibSystemDepency(unsigned int libCount, const macho_header* mh);
 179                         void            loadCodeSignature(const struct linkedit_data_command* codeSigCmd, int fd, uint64_t offsetInFatFile, const LinkContext& context);
 180                         void            validateFirstPages(const struct linkedit_data_command* codeSigCmd, int fd, const uint8_t *fileData, size_t lenFileData, off_t offsetInFat, const LinkContext& context);
 181                         const struct macho_segment_command* segLoadCommand(unsigned int segIndex) const;
 182                         void            parseLoadCmds(const ImageLoader::LinkContext& context);
 183                         int             crashIfInvalidCodeSignature();
 184                         bool            segHasRebaseFixUps(unsigned int) const;
 185                         bool            segHasBindFixUps(unsigned int) const;
 186                         void            segProtect(unsigned int segIndex, const ImageLoader::LinkContext& context);
 187                         void            segMakeWritable(unsigned int segIndex, const ImageLoader::LinkContext& context);
 188 #if __i386__
 189                         bool            segIsReadOnlyImport(unsigned int) const;
 190 #endif
 191                         intptr_t        assignSegmentAddresses(const LinkContext& context);
 192                         uintptr_t       reserveAnAddressRange(size_t length, const ImageLoader::LinkContext& context);
 193                         bool            reserveAddressRange(uintptr_t start, size_t length);
 194                         void            mapSegments(int fd, uint64_t offsetInFat, uint64_t lenInFat, uint64_t fileLen, const LinkContext& context);
 195                         void            mapSegments(const void* memoryImage, uint64_t imageLen, const LinkContext& context);
 196                         void            UnmapSegments();
 197                         void            __attribute__((noreturn)) throwSymbolNotFound(const LinkContext& context, const char* symbol,
 198                                                                                                                                         const char* referencedFrom, const char* fromVersMismatch,
 199                                                                                                                                         const char* expectedIn);
 200                         void            doImageInit(const LinkContext& context);
 201                         void            doModInitFunctions(const LinkContext& context);
 202                         void            setupLazyPointerHandler(const LinkContext& context);
 203                         void            lookupProgramVars(const LinkContext& context) const;
 204
 205                         void            makeTextSegmentWritable(const LinkContext& context, bool writeable);
 206                         void            preFetchDATA(int fd, uint64_t offsetInFat, const LinkContext& context);
 207
 208
 209                         void            doInterpose(const LinkContext& context) = 0;
 210                         bool            hasReferencesToWeakSymbols() const;
 211                         uintptr_t       getSymbolAddress(const Symbol* sym, const ImageLoader* requestor,
 212                                                                                 const LinkContext& context, bool runResolver) const;
 213
 214         static uintptr_t                        bindLazySymbol(const mach_header*, uintptr_t* lazyPointer);
 215 protected:
 216         uint64_t                                                                fCoveredCodeLength;
 217         const uint8_t*                                                  fMachOData;
 218         const uint8_t*                                                  fLinkEditBase; // add any internal "offset" to this to get mapped address
 219         uintptr_t                                                               fSlide;
 220         uint32_t                                                                fEHFrameSectionOffset;
 221         uint32_t                                                                fUnwindInfoSectionOffset;
 222         uint32_t                                                                fDylibIDOffset;
 223         uint32_t                                                                fSegmentsCount : 8,
 224                                                                                         fIsSplitSeg : 1,
 225                                                                                         fInSharedCache : 1,
 226 #if TEXT_RELOC_SUPPORT
 227                                                                                         fTextSegmentRebases : 1,
 228                                                                                         fTextSegmentBinds : 1,
 229 #endif
 230 #if __i386__
 231                                                                                         fReadOnlyImportSegment : 1,
 232 #endif
 233                                                                                         fHasSubLibraries : 1,
 234                                                                                         fHasSubUmbrella : 1,
 235                                                                                         fInUmbrella : 1,
 236                                                                                         fHasDOFSections : 1,
 237                                                                                         fHasDashInit : 1,
 238                                                                                         fHasInitializers : 1,
 239                                                                                         fHasTerminators : 1,
 240                                                                                         fNotifyObjC : 1,
 241                                                                                         fRetainForObjC : 1,
 242                                                                                         fRegisteredAsRequiresCoalescing : 1;    // <rdar://problem/7886402> Loading MH_DYLIB_STUB causing coalescable miscount
 243
 244
 245         static uint32_t                                 fgSymbolTableBinarySearchs;
 246 };
 247
 248
 249 #endif // __IMAGELOADERMACHO__
 250
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 253