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
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   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[4096], 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 ImageLoader** foundIn) const;
  61         virtual uintptr_t                                       getExportedSymbolAddress(const Symbol* sym, const LinkContext& context,
  62                                                                                                                                 const ImageLoader* requestor, bool runResolver) 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) = 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, 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
 108
 109         static void                                                     printStatistics(unsigned int imageCount, const InitializerTimingList&);
 110         static  uint32_t                                        minOSVersion(const mach_header*);
 111
 112 protected:
 113                                                 ImageLoaderMachO(const ImageLoaderMachO&);
 114                                                 ImageLoaderMachO(const macho_header* mh, const char* path, unsigned int segCount,
 115                                                                                                                                         uint32_t segOffsets[], unsigned int libCount);
 116         virtual                         ~ImageLoaderMachO() {}
 117
 118         void                            operator=(const ImageLoaderMachO&);
 119
 120         virtual void                                            setDyldInfo(const struct dyld_info_command*) = 0;
 121         virtual void                                            setSymbolTableInfo(const macho_nlist*, const char*, const dysymtab_command*) = 0;
 122         virtual bool                                            isSubframeworkOf(const LinkContext& context, const ImageLoader* image) const = 0;
 123         virtual bool                                            hasSubLibrary(const LinkContext& context, const ImageLoader* child) const = 0;
 124         virtual uint32_t*                                       segmentCommandOffsets() const = 0;
 125         virtual void                                            rebase(const LinkContext& context) = 0;
 126         virtual const ImageLoader::Symbol*      findExportedSymbol(const char* name, const ImageLoader** foundIn) const = 0;
 127         virtual bool                                            containsSymbol(const void* addr) const = 0;
 128         virtual uintptr_t                                       exportedSymbolAddress(const LinkContext& context, const Symbol* symbol, const ImageLoader* requestor, bool runResolver) const = 0;
 129         virtual bool                                            exportedSymbolIsWeakDefintion(const Symbol* symbol) const = 0;
 130         virtual const char*                                     exportedSymbolName(const Symbol* symbol) const = 0;
 131         virtual unsigned int                            exportedSymbolCount() const = 0;
 132         virtual const ImageLoader::Symbol*      exportedSymbolIndexed(unsigned int) const = 0;
 133         virtual unsigned int                            importedSymbolCount() const = 0;
 134         virtual const ImageLoader::Symbol*      importedSymbolIndexed(unsigned int) const = 0;
 135         virtual const char*                                     importedSymbolName(const Symbol* symbol) const = 0;
 136 #if PREBOUND_IMAGE_SUPPORT
 137         virtual void                                            resetPreboundLazyPointers(const LinkContext& context) = 0;
 138 #endif
 139
 140
 141         virtual void            doGetDependentLibraries(DependentLibraryInfo libs[]);
 142         virtual LibraryInfo doGetLibraryInfo();
 143         virtual void            getRPaths(const LinkContext& context, std::vector<const char*>&) const;
 144         virtual bool            getUUID(uuid_t) const;
 145         virtual void            doRebase(const LinkContext& context);
 146         virtual void            doBind(const LinkContext& context, bool forceLazysBound) = 0;
 147         virtual void            doBindJustLazies(const LinkContext& context) = 0;
 148         virtual bool            doInitialization(const LinkContext& context);
 149         virtual void            doGetDOFSections(const LinkContext& context, std::vector<ImageLoader::DOFInfo>& dofs);
 150         virtual bool            needsTermination();
 151         virtual bool            segmentsMustSlideTogether() const;
 152         virtual bool            segmentsCanSlide() const;
 153         virtual void            setSlide(intptr_t slide);
 154         virtual bool            usesTwoLevelNameSpace() const;
 155         virtual bool            isPrebindable() const;
 156
 157
 158 protected:
 159
 160                         void            destroy();
 161         static void                     sniffLoadCommands(const macho_header* mh, const char* path, bool inCache, bool* compressed,
 162                                                                                         unsigned int* segCount, unsigned int* libCount, const LinkContext& context,
 163                                                                                         const linkedit_data_command** codeSigCmd,
 164                                                                                         const encryption_info_command** encryptCmd);
 165         static bool                     needsAddedLibSystemDepency(unsigned int libCount, const macho_header* mh);
 166                         void            loadCodeSignature(const struct linkedit_data_command* codeSigCmd, int fd, uint64_t offsetInFatFile, const LinkContext& context);
 167                         void            validateFirstPages(const struct linkedit_data_command* codeSigCmd, int fd, const uint8_t *fileData, size_t lenFileData, off_t offsetInFat, const LinkContext& context);
 168                         const struct macho_segment_command* segLoadCommand(unsigned int segIndex) const;
 169                         void            parseLoadCmds(const ImageLoader::LinkContext& context);
 170                         int             crashIfInvalidCodeSignature();
 171                         bool            segHasRebaseFixUps(unsigned int) const;
 172                         bool            segHasBindFixUps(unsigned int) const;
 173                         void            segProtect(unsigned int segIndex, const ImageLoader::LinkContext& context);
 174                         void            segMakeWritable(unsigned int segIndex, const ImageLoader::LinkContext& context);
 175 #if __i386__
 176                         bool            segIsReadOnlyImport(unsigned int) const;
 177 #endif
 178                         intptr_t        assignSegmentAddresses(const LinkContext& context);
 179                         uintptr_t       reserveAnAddressRange(size_t length, const ImageLoader::LinkContext& context);
 180                         bool            reserveAddressRange(uintptr_t start, size_t length);
 181                         void            mapSegments(int fd, uint64_t offsetInFat, uint64_t lenInFat, uint64_t fileLen, const LinkContext& context);
 182                         void            mapSegments(const void* memoryImage, uint64_t imageLen, const LinkContext& context);
 183                         void            UnmapSegments();
 184                         void            __attribute__((noreturn)) throwSymbolNotFound(const LinkContext& context, const char* symbol,
 185                                                                                                                                         const char* referencedFrom, const char* fromVersMismatch,
 186                                                                                                                                         const char* expectedIn);
 187                         void            doImageInit(const LinkContext& context);
 188                         void            doModInitFunctions(const LinkContext& context);
 189                         void            setupLazyPointerHandler(const LinkContext& context);
 190                         void            lookupProgramVars(const LinkContext& context) const;
 191                         uintptr_t       bindLocation(const LinkContext& context, uintptr_t location, uintptr_t value,
 192                                                                                 const ImageLoader* targetImage, uint8_t type, const char* symbolName,
 193                                                                                 intptr_t addend, const char* msg);
 194
 195                         void            makeTextSegmentWritable(const LinkContext& context, bool writeable);
 196                         void            preFetchDATA(int fd, uint64_t offsetInFat, const LinkContext& context);
 197
 198
 199                         void            doInterpose(const LinkContext& context) = 0;
 200                         bool            hasReferencesToWeakSymbols() const;
 201                         uintptr_t       getSymbolAddress(const Symbol* sym, const ImageLoader* requestor,
 202                                                                                 const LinkContext& context, bool runResolver) const;
 203
 204         static uintptr_t                        bindLazySymbol(const mach_header*, uintptr_t* lazyPointer);
 205 protected:
 206         uint64_t                                                                fCoveredCodeLength;
 207         const uint8_t*                                                  fMachOData;
 208         const uint8_t*                                                  fLinkEditBase; // add any internal "offset" to this to get mapped address
 209         uintptr_t                                                               fSlide;
 210         uint32_t                                                                fEHFrameSectionOffset;
 211         uint32_t                                                                fUnwindInfoSectionOffset;
 212         uint32_t                                                                fDylibIDOffset;
 213         uint32_t                                                                fSegmentsCount : 8,
 214                                                                                         fIsSplitSeg : 1,
 215                                                                                         fInSharedCache : 1,
 216 #if TEXT_RELOC_SUPPORT
 217                                                                                         fTextSegmentRebases : 1,
 218                                                                                         fTextSegmentBinds : 1,
 219 #endif
 220 #if __i386__
 221                                                                                         fReadOnlyImportSegment : 1,
 222 #endif
 223                                                                                         fHasSubLibraries : 1,
 224                                                                                         fHasSubUmbrella : 1,
 225                                                                                         fInUmbrella : 1,
 226                                                                                         fHasDOFSections : 1,
 227                                                                                         fHasDashInit : 1,
 228                                                                                         fHasInitializers : 1,
 229                                                                                         fHasTerminators : 1,
 230                                                                                         fRegisteredAsRequiresCoalescing : 1;    // <rdar://problem/7886402> Loading MH_DYLIB_STUB causing coalescable miscount
 231
 232
 233         static uint32_t                                 fgSymbolTableBinarySearchs;
 234         static uint32_t                                 fgSymbolTrieSearchs;
 235 };
 236
 237
 238 #endif // __IMAGELOADERMACHO__
 239
 240
 241
 242