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--- dyld/dyld-96.2/src/ImageLoader.cpp
+++ /dev/null
@@ -1,1111 +0,0 @@
-/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
- *
- * Copyright (c) 2004-2006 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-#define __STDC_LIMIT_MACROS
-#include <stdint.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <mach/mach.h>
-#include <mach-o/fat.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-#include <sys/param.h>
-#include <sys/mount.h>
-#include <libkern/OSAtomic.h>
-
-#include "ImageLoader.h"
-
-// in libc.a
-extern "C" void _spin_lock(uint32_t*);
-extern "C" void _spin_unlock(uint32_t*);
-
-uint32_t ImageLoader::fgImagesUsedFromSharedCache = 0;
-uint32_t ImageLoader::fgImagesWithUsedPrebinding = 0;
-uint32_t ImageLoader::fgImagesRequiringNoFixups = 0;
-uint32_t ImageLoader::fgTotalRebaseFixups = 0;
-uint32_t ImageLoader::fgTotalBindFixups = 0;
-uint32_t ImageLoader::fgTotalBindSymbolsResolved = 0;
-uint32_t ImageLoader::fgTotalBindImageSearches = 0;
-uint32_t ImageLoader::fgTotalLazyBindFixups = 0;
-uint32_t ImageLoader::fgTotalPossibleLazyBindFixups = 0;
-uint32_t ImageLoader::fgTotalSegmentsMapped = 0;
-uint64_t ImageLoader::fgTotalBytesMapped = 0;
-uint64_t ImageLoader::fgTotalBytesPreFetched = 0;
-uint64_t ImageLoader::fgTotalLoadLibrariesTime;
-uint64_t ImageLoader::fgTotalRebaseTime;
-uint64_t ImageLoader::fgTotalBindTime;
-uint64_t ImageLoader::fgTotalInitTime;
-uintptr_t ImageLoader::fgNextSplitSegAddress = 0x90000000;
-uint16_t ImageLoader::fgLoadOrdinal = 0;
-uintptr_t Segment::fgNextPIEDylibAddress = 0;
-
-
-void ImageLoader::init(const char* path, uint64_t offsetInFat, dev_t device, ino_t inode, time_t modDate)
-{
- fPathHash = 0;
- fPath = path;
- fLogicalPath = NULL;
- fDevice = device;
- fInode = inode;
- fLastModified = modDate;
- fOffsetInFatFile = offsetInFat;
- fLibraries = NULL;
- fLibrariesCount = 0;
- fDlopenReferenceCount = 0;
- fStaticReferenceCount = 0;
- fDynamicReferenceCount = 0;
- fDynamicReferences = NULL;
- fDepth = 0;
- fLoadOrder = fgLoadOrdinal++;
- fState = 0;
- fAllLibraryChecksumsAndLoadAddressesMatch = false;
- fLeaveMapped = false;
- fNeverUnload = false;
- fHideSymbols = false;
- fMatchByInstallName = false;
- fRegisteredDOF = false;
-#if IMAGE_NOTIFY_SUPPORT
- fAnnounced = false;
-#endif
- fAllLazyPointersBound = false;
- fBeingRemoved = false;
- fAddFuncNotified = false;
- fPathOwnedByImage = false;
-#if RECURSIVE_INITIALIZER_LOCK
- fInitializerRecursiveLock = NULL;
-#else
- fInitializerLock = 0;
-#endif
- if ( fPath != NULL )
- fPathHash = hash(fPath);
-}
-
-
-ImageLoader::ImageLoader(const char* path, uint64_t offsetInFat, const struct stat& info)
-{
- init(path, offsetInFat, info.st_dev, info.st_ino, info.st_mtime);
-}
-
-ImageLoader::ImageLoader(const char* moduleName)
-{
- init(moduleName, 0, 0, 0, 0);
-}
-
-
-ImageLoader::~ImageLoader()
-{
- if ( fPathOwnedByImage && (fPath != NULL) )
- delete [] fPath;
- if ( fLogicalPath != NULL )
- delete [] fLogicalPath;
- if ( fLibraries != NULL ) {
- for (uint32_t i = 0; i < fLibrariesCount; ++i) {
- if ( fLibraries[i].image != NULL )
- fLibraries[i].image->fStaticReferenceCount--;
- }
- delete [] fLibraries;
- }
- if ( fDynamicReferences != NULL ) {
- for (std::set<const ImageLoader*>::iterator it = fDynamicReferences->begin(); it != fDynamicReferences->end(); ++it ) {
- const_cast<ImageLoader*>(*it)->fDynamicReferenceCount--;
- }
- delete fDynamicReferences;
- }
-}
-
-void ImageLoader::setMapped(const LinkContext& context)
-{
- fState = dyld_image_state_mapped;
- context.notifySingle(dyld_image_state_mapped, this->machHeader(), fPath, fLastModified);
-}
-
-void ImageLoader::addDynamicReference(const ImageLoader* target)
-{
- if ( fDynamicReferences == NULL )
- fDynamicReferences = new std::set<const ImageLoader*>();
- if ( fDynamicReferences->count(target) == 0 ) {
- fDynamicReferences->insert(target);
- const_cast<ImageLoader*>(target)->fDynamicReferenceCount++;
- }
- //dyld::log("dyld: addDynamicReference() from %s to %s, fDynamicReferences->size()=%lu\n", this->getPath(), target->getPath(), fDynamicReferences->size());
-}
-
-int ImageLoader::compare(const ImageLoader* right) const
-{
- if ( this->fDepth == right->fDepth ) {
- if ( this->fLoadOrder == right->fLoadOrder )
- return 0;
- else if ( this->fLoadOrder < right->fLoadOrder )
- return -1;
- else
- return 1;
- }
- else {
- if ( this->fDepth < right->fDepth )
- return -1;
- else
- return 1;
- }
-}
-
-void ImageLoader::setPath(const char* path)
-{
- if ( fPathOwnedByImage && (fPath != NULL) )
- delete [] fPath;
- fPath = new char[strlen(path)+1];
- strcpy((char*)fPath, path);
- fPathOwnedByImage = true; // delete fPath when this image is destructed
- fPathHash = hash(fPath);
-}
-
-void ImageLoader::setPathUnowned(const char* path)
-{
- if ( fPathOwnedByImage && (fPath != NULL) ) {
- delete [] fPath;
- }
- fPath = path;
- fPathOwnedByImage = false;
- fPathHash = hash(fPath);
-}
-
-void ImageLoader::setLogicalPath(const char* path)
-{
- if ( fPath == NULL ) {
- // no physical path set yet, so use this path as physical
- this->setPath(path);
- }
- else if ( strcmp(path, fPath) == 0 ) {
- // do not set logical path because it is the same as the physical path
- fLogicalPath = NULL;
- }
- else {
- fLogicalPath = new char[strlen(path)+1];
- strcpy((char*)fLogicalPath, path);
- }
-}
-
-const char* ImageLoader::getLogicalPath() const
-{
- if ( fLogicalPath != NULL )
- return fLogicalPath;
- else
- return fPath;
-}
-
-uint32_t ImageLoader::hash(const char* path)
-{
- // this does not need to be a great hash
- // it is just used to reduce the number of strcmp() calls
- // of existing images when loading a new image
- uint32_t h = 0;
- for (const char* s=path; *s != '\0'; ++s)
- h = h*5 + *s;
- return h;
-}
-
-bool ImageLoader::matchInstallPath() const
-{
- return fMatchByInstallName;
-}
-
-void ImageLoader::setMatchInstallPath(bool match)
-{
- fMatchByInstallName = match;
-}
-
-bool ImageLoader::statMatch(const struct stat& stat_buf) const
-{
- return ( (this->fDevice == stat_buf.st_dev) && (this->fInode == stat_buf.st_ino) );
-}
-
-const char* ImageLoader::getShortName() const
-{
- // try to return leaf name
- if ( fPath != NULL ) {
- const char* s = strrchr(fPath, '/');
- if ( s != NULL )
- return &s[1];
- }
- return fPath;
-}
-
-uint64_t ImageLoader::getOffsetInFatFile() const
-{
- return fOffsetInFatFile;
-}
-
-void ImageLoader::setLeaveMapped()
-{
- fLeaveMapped = true;
-}
-
-void ImageLoader::setHideExports(bool hide)
-{
- fHideSymbols = hide;
-}
-
-bool ImageLoader::hasHiddenExports() const
-{
- return fHideSymbols;
-}
-
-bool ImageLoader::isLinked() const
-{
- return (fState >= dyld_image_state_bound);
-}
-
-time_t ImageLoader::lastModified() const
-{
- return fLastModified;
-}
-
-bool ImageLoader::containsAddress(const void* addr) const
-{
- if ( ! this->isLinked() )
- return false;
- for(ImageLoader::SegmentIterator it = this->beginSegments(); it != this->endSegments(); ++it ) {
- Segment* seg = *it;
- const uint8_t* start = (const uint8_t*)seg->getActualLoadAddress(this);
- const uint8_t* end = start + seg->getSize();
- if ( (start <= addr) && (addr < end) && !seg->unaccessible() )
- return true;
- }
- return false;
-}
-
-bool ImageLoader::overlapsWithAddressRange(const void* start, const void* end) const
-{
- for(ImageLoader::SegmentIterator it = this->beginSegments(); it != this->endSegments(); ++it ) {
- Segment* seg = *it;
- const uint8_t* segStart = (const uint8_t*)(seg->getActualLoadAddress(this));
- const uint8_t* segEnd = segStart + seg->getSize();
- if ( (start <= segStart) && (segStart < end) )
- return true;
- if ( (start <= segEnd) && (segEnd < end) )
- return true;
- if ( (segStart < start) && (end < segEnd) )
- return true;
- }
- return false;
-}
-
-void ImageLoader::getMappedRegions(MappedRegion*& regions) const
-{
- for(ImageLoader::SegmentIterator it = this->beginSegments(); it != this->endSegments(); ++it ) {
- Segment* seg = *it;
- MappedRegion region;
- region.address = seg->getActualLoadAddress(this);
- region.size = seg->getSize();
- *regions++ = region;
- }
-}
-
-
-static bool notInImgageList(const ImageLoader* image, const ImageLoader** dsiStart, const ImageLoader** dsiCur)
-{
- for (const ImageLoader** p = dsiStart; p < dsiCur; ++p)
- if ( *p == image )
- return false;
- return true;
-}
-
-
-// private method that handles circular dependencies by only search any image once
-const ImageLoader::Symbol* ImageLoader::findExportedSymbolInDependentImagesExcept(const char* name,
- const ImageLoader** dsiStart, const ImageLoader**& dsiCur, const ImageLoader** dsiEnd, const ImageLoader** foundIn) const
-{
- const ImageLoader::Symbol* sym;
-
- // search self
- if ( notInImgageList(this, dsiStart, dsiCur) ) {
- sym = this->findExportedSymbol(name, NULL, false, foundIn);
- if ( sym != NULL )
- return sym;
- *dsiCur++ = this;
- }
-
- // search directly dependent libraries
- for (uint32_t i=0; i < fLibrariesCount; ++i) {
- ImageLoader* dependentImage = fLibraries[i].image;
- if ( (dependentImage != NULL) && notInImgageList(dependentImage, dsiStart, dsiCur) ) {
- const ImageLoader::Symbol* sym = dependentImage->findExportedSymbol(name, NULL, false, foundIn);
- if ( sym != NULL )
- return sym;
- }
- }
-
- // search indirectly dependent libraries
- for (uint32_t i=0; i < fLibrariesCount; ++i) {
- ImageLoader* dependentImage = fLibraries[i].image;
- if ( (dependentImage != NULL) && notInImgageList(dependentImage, dsiStart, dsiCur) ) {
- *dsiCur++ = dependentImage;
- const ImageLoader::Symbol* sym = dependentImage->findExportedSymbolInDependentImagesExcept(name, dsiStart, dsiCur, dsiEnd, foundIn);
- if ( sym != NULL )
- return sym;
- }
- }
-
- return NULL;
-}
-
-
-const ImageLoader::Symbol* ImageLoader::findExportedSymbolInDependentImages(const char* name, const LinkContext& context, const ImageLoader** foundIn) const
-{
- unsigned int imageCount = context.imageCount();
- const ImageLoader* dontSearchImages[imageCount];
- dontSearchImages[0] = this; // don't search this image
- const ImageLoader** cur = &dontSearchImages[1];
- return this->findExportedSymbolInDependentImagesExcept(name, &dontSearchImages[0], cur, &dontSearchImages[imageCount], foundIn);
-}
-
-const ImageLoader::Symbol* ImageLoader::findExportedSymbolInImageOrDependentImages(const char* name, const LinkContext& context, const ImageLoader** foundIn) const
-{
- unsigned int imageCount = context.imageCount();
- const ImageLoader* dontSearchImages[imageCount];
- const ImageLoader** cur = &dontSearchImages[0];
- return this->findExportedSymbolInDependentImagesExcept(name, &dontSearchImages[0], cur, &dontSearchImages[imageCount], foundIn);
-}
-
-
-void ImageLoader::link(const LinkContext& context, bool forceLazysBound, bool preflightOnly, const RPathChain& loaderRPaths)
-{
- //dyld::log("ImageLoader::link(%s) refCount=%d, neverUnload=%d\n", this->getPath(), fStaticReferenceCount, fNeverUnload);
-
- uint64_t t0 = mach_absolute_time();
- this->recursiveLoadLibraries(context,loaderRPaths);
- context.notifyBatch(dyld_image_state_dependents_mapped);
-
- // we only do the loading step for preflights
- if ( preflightOnly )
- return;
-
- uint64_t t1 = mach_absolute_time();
- context.clearAllDepths();
- this->recursiveUpdateDepth(context.imageCount());
-
- uint64_t t2 = mach_absolute_time();
- this->recursiveRebase(context);
- context.notifyBatch(dyld_image_state_rebased);
-
- uint64_t t3 = mach_absolute_time();
- this->recursiveBind(context, forceLazysBound);
- context.notifyBatch(dyld_image_state_bound);
-
- uint64_t t4 = mach_absolute_time();
- std::vector<DOFInfo> dofs;
- this->recursiveGetDOFSections(context, dofs);
- context.registerDOFs(dofs);
-
-
- fgTotalLoadLibrariesTime += t1 - t0;
- fgTotalRebaseTime += t3 - t2;
- fgTotalBindTime += t4 - t3;
-
- // done with initial dylib loads
- Segment::fgNextPIEDylibAddress = 0;
-}
-
-
-void ImageLoader::printReferenceCounts()
-{
- dyld::log(" dlopen=%d, static=%d, dynamic=%d for %s\n",
- fDlopenReferenceCount, fStaticReferenceCount, fDynamicReferenceCount, getPath() );
-}
-
-
-bool ImageLoader::decrementDlopenReferenceCount()
-{
- if ( fDlopenReferenceCount == 0 )
- return true;
- --fDlopenReferenceCount;
- return false;
-}
-
-void ImageLoader::runInitializers(const LinkContext& context)
-{
-#if IMAGE_NOTIFY_SUPPORT
- ImageLoader* newImages[context.imageCount()];
- ImageLoader** end = newImages;
- this->recursiveImageAnnouncement(context, end); // build bottom up list images being added
- context.notifyAdding(newImages, end-newImages); // tell anyone who cares about these
-#endif
-
- uint64_t t1 = mach_absolute_time();
- this->recursiveInitialization(context, mach_thread_self());
- context.notifyBatch(dyld_image_state_initialized);
- uint64_t t2 = mach_absolute_time();
- fgTotalInitTime += (t2 - t1);
-}
-
-
-void ImageLoader::bindAllLazyPointers(const LinkContext& context, bool recursive)
-{
- if ( ! fAllLazyPointersBound ) {
- fAllLazyPointersBound = true;
-
- if ( recursive ) {
- // bind lower level libraries first
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL )
- libInfo.image->bindAllLazyPointers(context, recursive);
- }
- }
- // bind lazies in this image
- this->doBindJustLazies(context);
- }
-}
-
-
-intptr_t ImageLoader::assignSegmentAddresses(const LinkContext& context)
-{
- // preflight and calculate slide if needed
- intptr_t slide = 0;
- if ( this->segmentsCanSlide() && this->segmentsMustSlideTogether() ) {
- bool needsToSlide = false;
- uintptr_t lowAddr = UINTPTR_MAX;
- uintptr_t highAddr = 0;
- for(ImageLoader::SegmentIterator it = this->beginSegments(); it != this->endSegments(); ++it ) {
- Segment* seg = *it;
- const uintptr_t segLow = seg->getPreferredLoadAddress();
- const uintptr_t segHigh = (segLow + seg->getSize() + 4095) & -4096;
- if ( segLow < lowAddr )
- lowAddr = segLow;
- if ( segHigh > highAddr )
- highAddr = segHigh;
-
- if ( !seg->hasPreferredLoadAddress() || !Segment::reserveAddressRange(seg->getPreferredLoadAddress(), seg->getSize()) )
- needsToSlide = true;
- }
- if ( needsToSlide ) {
- // find a chunk of address space to hold all segments
- uintptr_t addr = Segment::reserveAnAddressRange(highAddr-lowAddr, context);
- slide = addr - lowAddr;
- }
- }
- else if ( ! this->segmentsCanSlide() ) {
- for(ImageLoader::SegmentIterator it = this->beginSegments(); it != this->endSegments(); ++it ) {
- Segment* seg = *it;
- if ( strcmp(seg->getName(), "__PAGEZERO") == 0 )
- continue;
- if ( !Segment::reserveAddressRange(seg->getPreferredLoadAddress(), seg->getSize()) )
- throw "can't map";
- }
- }
- else {
- // mach-o does not support independently sliding segments
- }
- return slide;
-}
-
-
-void ImageLoader::mapSegments(int fd, uint64_t offsetInFat, uint64_t lenInFat, uint64_t fileLen, const LinkContext& context)
-{
- if ( context.verboseMapping )
- dyld::log("dyld: Mapping %s\n", this->getPath());
- // find address range for image
- intptr_t slide = this->assignSegmentAddresses(context);
- // map in all segments
- for(ImageLoader::SegmentIterator it = this->beginSegments(); it != this->endSegments(); ++it ) {
- Segment* seg = *it;
- seg->map(fd, offsetInFat, slide, this, context);
- }
- // update slide to reflect load location
- this->setSlide(slide);
-}
-
-void ImageLoader::mapSegments(const void* memoryImage, uint64_t imageLen, const LinkContext& context)
-{
- if ( context.verboseMapping )
- dyld::log("dyld: Mapping memory %p\n", memoryImage);
- // find address range for image
- intptr_t slide = this->assignSegmentAddresses(context);
- // map in all segments
- for(ImageLoader::SegmentIterator it = this->beginSegments(); it != this->endSegments(); ++it ) {
- Segment* seg = *it;
- seg->map(memoryImage, slide, this, context);
- }
- // update slide to reflect load location
- this->setSlide(slide);
- // set R/W permissions on all segments at slide location
- for(ImageLoader::SegmentIterator it = this->beginSegments(); it != this->endSegments(); ++it ) {
- Segment* seg = *it;
- seg->setPermissions(context, this);
- }
-}
-
-bool ImageLoader::allDependentLibrariesAsWhenPreBound() const
-{
- return fAllLibraryChecksumsAndLoadAddressesMatch;
-}
-
-
-unsigned int ImageLoader::recursiveUpdateDepth(unsigned int maxDepth)
-{
- // the purpose of this phase is to make the images sortable such that
- // in a sort list of images, every image that an image depends on
- // occurs in the list before it.
- if ( fDepth == 0 ) {
- // break cycles
- fDepth = maxDepth;
-
- // get depth of dependents
- unsigned int minDependentDepth = maxDepth;
- for(unsigned int i=0; i < fLibrariesCount; ++i) {
- DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL ) {
- unsigned int d = libInfo.image->recursiveUpdateDepth(maxDepth);
- if ( d < minDependentDepth )
- minDependentDepth = d;
- }
- }
-
- // make me less deep then all my dependents
- fDepth = minDependentDepth - 1;
- }
-
- return fDepth;
-}
-
-
-void ImageLoader::recursiveLoadLibraries(const LinkContext& context, const RPathChain& loaderRPaths)
-{
- if ( fState < dyld_image_state_dependents_mapped ) {
- // break cycles
- fState = dyld_image_state_dependents_mapped;
-
- // get list of libraries this image needs
- fLibrariesCount = this->doGetDependentLibraryCount();
- fLibraries = new DependentLibrary[fLibrariesCount];
- bzero(fLibraries, sizeof(DependentLibrary)*fLibrariesCount);
- DependentLibraryInfo libraryInfos[fLibrariesCount];
- this->doGetDependentLibraries(libraryInfos);
-
- // get list of rpaths that this image adds
- std::vector<const char*> rpathsFromThisImage;
- this->getRPaths(context, rpathsFromThisImage);
- const RPathChain thisRPaths(&loaderRPaths, &rpathsFromThisImage);
-
- // try to load each
- bool canUsePrelinkingInfo = true;
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- DependentLibrary& requiredLib = fLibraries[i];
- DependentLibraryInfo& requiredLibInfo = libraryInfos[i];
- try {
- bool depNamespace = false;
- requiredLib.image = context.loadLibrary(requiredLibInfo.name, true, depNamespace, this->getPath(), &thisRPaths);
- if ( requiredLib.image == this ) {
- // found circular reference, perhaps DYLD_LIBARY_PATH is causing this rdar://problem/3684168
- requiredLib.image = context.loadLibrary(requiredLibInfo.name, false, depNamespace, NULL, NULL);
- if ( requiredLib.image != this )
- dyld::warn("DYLD_ setting caused circular dependency in %s\n", this->getPath());
- }
- if ( fNeverUnload )
- requiredLib.image->setNeverUnload();
- requiredLib.image->fStaticReferenceCount += 1;
- LibraryInfo actualInfo = requiredLib.image->doGetLibraryInfo();
- requiredLib.required = requiredLibInfo.required;
- requiredLib.checksumMatches = ( actualInfo.checksum == requiredLibInfo.info.checksum );
- requiredLib.isReExported = requiredLibInfo.reExported;
- if ( ! requiredLib.isReExported ) {
- requiredLib.isSubFramework = requiredLib.image->isSubframeworkOf(context, this);
- requiredLib.isReExported = requiredLib.isSubFramework || this->hasSubLibrary(context, requiredLib.image);
- }
- // check found library version is compatible
- if ( actualInfo.minVersion < requiredLibInfo.info.minVersion ) {
- dyld::throwf("Incompatible library version: %s requires version %d.%d.%d or later, but %s provides version %d.%d.%d",
- this->getShortName(), requiredLibInfo.info.minVersion >> 16, (requiredLibInfo.info.minVersion >> 8) & 0xff, requiredLibInfo.info.minVersion & 0xff,
- requiredLib.image->getShortName(), actualInfo.minVersion >> 16, (actualInfo.minVersion >> 8) & 0xff, actualInfo.minVersion & 0xff);
- }
- // prebinding for this image disabled if any dependent library changed or slid
- if ( !requiredLib.checksumMatches || (requiredLib.image->getSlide() != 0) )
- canUsePrelinkingInfo = false;
- //if ( context.verbosePrebinding ) {
- // if ( !requiredLib.checksumMatches )
- // fprintf(stderr, "dyld: checksum mismatch, (%u v %u) for %s referencing %s\n",
- // requiredLibInfo.info.checksum, actualInfo.checksum, this->getPath(), requiredLib.image->getPath());
- // if ( requiredLib.image->getSlide() != 0 )
- // fprintf(stderr, "dyld: dependent library slid for %s referencing %s\n", this->getPath(), requiredLib.image->getPath());
- //}
- }
- catch (const char* msg) {
- //if ( context.verbosePrebinding )
- // fprintf(stderr, "dyld: exception during processing for %s referencing %s\n", this->getPath(), requiredLib.image->getPath());
- if ( requiredLibInfo.required ) {
- fState = dyld_image_state_mapped;
- dyld::throwf("Library not loaded: %s\n Referenced from: %s\n Reason: %s", requiredLibInfo.name, this->getPath(), msg);
- }
- // ok if weak library not found
- requiredLib.image = NULL;
- canUsePrelinkingInfo = false; // this disables all prebinding, we may want to just slam import vectors for this lib to zero
- }
- }
- fAllLibraryChecksumsAndLoadAddressesMatch = canUsePrelinkingInfo;
-
- // tell each to load its dependents
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- DependentLibrary& lib = fLibraries[i];
- if ( lib.image != NULL ) {
- lib.image->recursiveLoadLibraries(context, thisRPaths);
- }
- }
-
- // do deep prebind check
- if ( fAllLibraryChecksumsAndLoadAddressesMatch ) {
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- const DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL ) {
- if ( !libInfo.image->allDependentLibrariesAsWhenPreBound() )
- fAllLibraryChecksumsAndLoadAddressesMatch = false;
- }
- }
- }
-
- // free rpaths (getRPaths() malloc'ed each string)
- for(std::vector<const char*>::iterator it=rpathsFromThisImage.begin(); it != rpathsFromThisImage.end(); ++it) {
- const char* str = *it;
- free((void*)str);
- }
-
- }
-}
-
-void ImageLoader::recursiveRebase(const LinkContext& context)
-{
- if ( fState < dyld_image_state_rebased ) {
- // break cycles
- fState = dyld_image_state_rebased;
-
- try {
- // rebase lower level libraries first
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL )
- libInfo.image->recursiveRebase(context);
- }
-
- // rebase this image
- doRebase(context);
-
- // notify
- context.notifySingle(dyld_image_state_rebased, this->machHeader(), fPath, fLastModified);
- }
- catch (const char* msg) {
- // this image is not rebased
- fState = dyld_image_state_dependents_mapped;
- throw;
- }
- }
-}
-
-
-
-
-void ImageLoader::recursiveBind(const LinkContext& context, bool forceLazysBound)
-{
- // Normally just non-lazy pointers are bound immediately.
- // The exceptions are:
- // 1) DYLD_BIND_AT_LAUNCH will cause lazy pointers to be bound immediately
- // 2) some API's (e.g. RTLD_NOW) can cause lazy pointers to be bound immediately
- if ( fState < dyld_image_state_bound ) {
- // break cycles
- fState = dyld_image_state_bound;
-
- try {
- // bind lower level libraries first
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL )
- libInfo.image->recursiveBind(context, forceLazysBound);
- }
- // bind this image
- this->doBind(context, forceLazysBound);
- this->doUpdateMappingPermissions(context);
- // mark if lazys are also bound
- if ( forceLazysBound || this->usablePrebinding(context) )
- fAllLazyPointersBound = true;
-
- context.notifySingle(dyld_image_state_bound, this->machHeader(), fPath, fLastModified);
- }
- catch (const char* msg) {
- // restore state
- fState = dyld_image_state_rebased;
- throw;
- }
- }
-}
-
-
-#if IMAGE_NOTIFY_SUPPORT
-void ImageLoader::recursiveImageAnnouncement(const LinkContext& context, ImageLoader**& newImages)
-{
- if ( ! fAnnounced ) {
- // break cycles
- fAnnounced = true;
-
- // announce lower level libraries first
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL )
- libInfo.image->recursiveImageAnnouncement(context, newImages);
- }
-
- // add to list of images to notify about
- *newImages++ = this;
- //dyld::log("next size = %d\n", newImages.size());
-
- // remember that this image wants to be notified about other images
- if ( this->hasImageNotification() )
- context.addImageNeedingNotification(this);
- }
-}
-#endif
-
-void ImageLoader::recursiveGetDOFSections(const LinkContext& context, std::vector<DOFInfo>& dofs)
-{
- if ( ! fRegisteredDOF ) {
- // break cycles
- fRegisteredDOF = true;
-
- // gather lower level libraries first
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL )
- libInfo.image->recursiveGetDOFSections(context, dofs);
- }
- this->doGetDOFSections(context, dofs);
- }
-}
-
-
-void ImageLoader::recursiveSpinLock(recursive_lock& rlock)
-{
- // try to set image's ivar fInitializerRecursiveLock to point to this lock_info
- // keep trying until success (spin)
- while ( ! OSAtomicCompareAndSwapPtrBarrier(NULL, &rlock, (void**)&fInitializerRecursiveLock) ) {
- // if fInitializerRecursiveLock already points to a different lock_info, if it is for
- // the same thread we are on, the increment the lock count, otherwise continue to spin
- if ( (fInitializerRecursiveLock != NULL) && (fInitializerRecursiveLock->thread == rlock.thread) )
- break;
- }
- ++(fInitializerRecursiveLock->count);
-}
-
-void ImageLoader::recursiveSpinUnLock()
-{
- if ( --(fInitializerRecursiveLock->count) == 0 )
- fInitializerRecursiveLock = NULL;
-}
-
-
-void ImageLoader::recursiveInitialization(const LinkContext& context, mach_port_t this_thread)
-{
-#if RECURSIVE_INITIALIZER_LOCK
- recursive_lock lock_info(this_thread);
- recursiveSpinLock(lock_info);
-#else
- _spin_lock(&fInitializerLock);
-#endif
-
- if ( fState < dyld_image_state_dependents_initialized-1 ) {
- uint8_t oldState = fState;
- // break cycles
- fState = dyld_image_state_dependents_initialized-1;
-
- try {
- // initialize lower level libraries first
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- DependentLibrary& libInfo = fLibraries[i];
- // don't try to initialize stuff "above" me
- if ( (libInfo.image != NULL) && (libInfo.image->fDepth >= fDepth) )
- libInfo.image->recursiveInitialization(context, this_thread);
- }
-
- // record termination order
- if ( this->needsTermination() )
- context.terminationRecorder(this);
-
- // let objc know we are about to initalize this image
- fState = dyld_image_state_dependents_initialized;
- oldState = fState;
- context.notifySingle(dyld_image_state_dependents_initialized, this->machHeader(), fPath, fLastModified);
-
- // initialize this image
- this->doInitialization(context);
- // let anyone know we finished initalizing this image
- fState = dyld_image_state_initialized;
- oldState = fState;
- context.notifySingle(dyld_image_state_initialized, this->machHeader(), fPath, fLastModified);
- }
- catch (const char* msg) {
- // this image is not initialized
- fState = oldState;
- #if RECURSIVE_INITIALIZER_LOCK
- recursiveSpinUnLock();
- #else
- _spin_unlock(&fInitializerLock);
- #endif
- throw;
- }
- }
-
-#if RECURSIVE_INITIALIZER_LOCK
- recursiveSpinUnLock();
-#else
- _spin_unlock(&fInitializerLock);
-#endif
-}
-
-
-static void printTime(const char* msg, uint64_t partTime, uint64_t totalTime)
-{
- static uint64_t sUnitsPerSecond = 0;
- if ( sUnitsPerSecond == 0 ) {
- struct mach_timebase_info timeBaseInfo;
- if ( mach_timebase_info(&timeBaseInfo) == KERN_SUCCESS ) {
- sUnitsPerSecond = 1000000000ULL * timeBaseInfo.denom / timeBaseInfo.numer;
- }
- }
- if ( partTime < sUnitsPerSecond ) {
- uint32_t milliSecondsTimeTen = (partTime*10000)/sUnitsPerSecond;
- uint32_t milliSeconds = milliSecondsTimeTen/10;
- uint32_t percentTimesTen = (partTime*1000)/totalTime;
- uint32_t percent = percentTimesTen/10;
- dyld::log("%s: %u.%u milliseconds (%u.%u%%)\n", msg, milliSeconds, milliSecondsTimeTen-milliSeconds*10, percent, percentTimesTen-percent*10);
- }
- else {
- uint32_t secondsTimeTen = (partTime*10)/sUnitsPerSecond;
- uint32_t seconds = secondsTimeTen/10;
- uint32_t percentTimesTen = (partTime*1000)/totalTime;
- uint32_t percent = percentTimesTen/10;
- dyld::log("%s: %u.%u seconds (%u.%u%%)\n", msg, seconds, secondsTimeTen-seconds*10, percent, percentTimesTen-percent*10);
- }
-}
-
-static char* commatize(uint64_t in, char* out)
-{
- uint64_t div10 = in / 10;
- uint8_t delta = in - div10*10;
- char* s = &out[32];
- int digitCount = 1;
- *s = '\0';
- *(--s) = '0' + delta;
- in = div10;
- while ( in != 0 ) {
- if ( (digitCount % 3) == 0 )
- *(--s) = ',';
- div10 = in / 10;
- delta = in - div10*10;
- *(--s) = '0' + delta;
- in = div10;
- ++digitCount;
- }
- return s;
-}
-
-
-
-void ImageLoader::printStatistics(unsigned int imageCount)
-{
- uint64_t totalTime = fgTotalLoadLibrariesTime + fgTotalRebaseTime + fgTotalBindTime + fgTotalInitTime;
- char commaNum1[40];
- char commaNum2[40];
-
- printTime("total time", totalTime, totalTime);
- dyld::log("total images loaded: %d (%u from dyld shared cache, %u needed no fixups)\n", imageCount, fgImagesUsedFromSharedCache, fgImagesRequiringNoFixups);
- dyld::log("total segments mapped: %u, into %llu pages with %llu pages pre-fetched\n", fgTotalSegmentsMapped, fgTotalBytesMapped/4096, fgTotalBytesPreFetched/4096);
- printTime("total images loading time", fgTotalLoadLibrariesTime, totalTime);
- dyld::log("total rebase fixups: %s\n", commatize(fgTotalRebaseFixups, commaNum1));
- printTime("total rebase fixups time", fgTotalRebaseTime, totalTime);
- dyld::log("total binding fixups: %s\n", commatize(fgTotalBindFixups, commaNum1));
- if ( fgTotalBindSymbolsResolved != 0 ) {
- uint32_t avgTimesTen = (fgTotalBindImageSearches * 10) / fgTotalBindSymbolsResolved;
- uint32_t avgInt = fgTotalBindImageSearches / fgTotalBindSymbolsResolved;
- uint32_t avgTenths = avgTimesTen - (avgInt*10);
- dyld::log("total binding symbol lookups: %s, average images searched per symbol: %u.%u\n",
- commatize(fgTotalBindSymbolsResolved, commaNum1), avgInt, avgTenths);
- }
- printTime("total binding fixups time", fgTotalBindTime, totalTime);
- dyld::log("total bindings lazily fixed up: %s of %s\n", commatize(fgTotalLazyBindFixups, commaNum1), commatize(fgTotalPossibleLazyBindFixups, commaNum2));
- printTime("total init time time", fgTotalInitTime, totalTime);
-}
-
-
-//
-// copy path and add suffix to result
-//
-// /path/foo.dylib _debug => /path/foo_debug.dylib
-// foo.dylib _debug => foo_debug.dylib
-// foo _debug => foo_debug
-// /path/bar _debug => /path/bar_debug
-// /path/bar.A.dylib _debug => /path/bar.A_debug.dylib
-//
-void ImageLoader::addSuffix(const char* path, const char* suffix, char* result)
-{
- strcpy(result, path);
-
- char* start = strrchr(result, '/');
- if ( start != NULL )
- start++;
- else
- start = result;
-
- char* dot = strrchr(start, '.');
- if ( dot != NULL ) {
- strcpy(dot, suffix);
- strcat(&dot[strlen(suffix)], &path[dot-result]);
- }
- else {
- strcat(result, suffix);
- }
-}
-
-
-void Segment::map(int fd, uint64_t offsetInFatWrapper, intptr_t slide, const ImageLoader* image, const ImageLoader::LinkContext& context)
-{
- vm_offset_t fileOffset = this->getFileOffset() + offsetInFatWrapper;
- vm_size_t size = this->getFileSize();
- void* requestedLoadAddress = (void*)(this->getPreferredLoadAddress() + slide);
- int protection = 0;
- if ( !this->unaccessible() ) {
- if ( this->executable() )
- protection |= PROT_EXEC;
- if ( this->readable() )
- protection |= PROT_READ;
- if ( this->writeable() )
- protection |= PROT_WRITE;
- }
-#if __i386__
- // initially map __IMPORT segments R/W so dyld can update them
- if ( this->readOnlyImportStubs() )
- protection |= PROT_WRITE;
-#endif
- // wholly zero-fill segments have nothing to mmap() in
- if ( size > 0 ) {
- void* loadAddress = mmap(requestedLoadAddress, size, protection, MAP_FIXED | MAP_PRIVATE, fd, fileOffset);
- if ( loadAddress == ((void*)(-1)) )
- dyld::throwf("mmap() error %d at address=0x%08lX, size=0x%08lX segment=%s in Segment::map() mapping %s", errno, (uintptr_t)requestedLoadAddress, (uintptr_t)size, this->getName(), image->getPath());
- }
- // update stats
- ++ImageLoader::fgTotalSegmentsMapped;
- ImageLoader::fgTotalBytesMapped += size;
- if ( context.verboseMapping )
- dyld::log("%18s at %p->%p with permissions %c%c%c\n", this->getName(), requestedLoadAddress, (char*)requestedLoadAddress+this->getFileSize()-1,
- (protection & PROT_READ) ? 'r' : '.', (protection & PROT_WRITE) ? 'w' : '.', (protection & PROT_EXEC) ? 'x' : '.' );
-}
-
-void Segment::map(const void* memoryImage, intptr_t slide, const ImageLoader* image, const ImageLoader::LinkContext& context)
-{
- vm_address_t loadAddress = this->getPreferredLoadAddress() + slide;
- vm_address_t srcAddr = (uintptr_t)memoryImage + this->getFileOffset();
- vm_size_t size = this->getFileSize();
- kern_return_t r = vm_copy(mach_task_self(), srcAddr, size, loadAddress);
- if ( r != KERN_SUCCESS )
- throw "can't map segment";
-
- if ( context.verboseMapping )
- dyld::log("%18s at %p->%p\n", this->getName(), (char*)loadAddress, (char*)loadAddress+this->getFileSize()-1);
-}
-
-void Segment::setPermissions(const ImageLoader::LinkContext& context, const ImageLoader* image)
-{
- vm_prot_t protection = 0;
- if ( !this->unaccessible() ) {
- if ( this->executable() )
- protection |= VM_PROT_EXECUTE;
- if ( this->readable() )
- protection |= VM_PROT_READ;
- if ( this->writeable() )
- protection |= VM_PROT_WRITE;
- }
- vm_address_t addr = this->getActualLoadAddress(image);
- vm_size_t size = this->getSize();
- const bool setCurrentPermissions = false;
- kern_return_t r = vm_protect(mach_task_self(), addr, size, setCurrentPermissions, protection);
- if ( r != KERN_SUCCESS )
- throw "can't set vm permissions for mapped segment";
- if ( context.verboseMapping ) {
- dyld::log("%18s at %p->%p altered permissions to %c%c%c\n", this->getName(), (char*)addr, (char*)addr+this->getFileSize()-1,
- (protection & PROT_READ) ? 'r' : '.', (protection & PROT_WRITE) ? 'w' : '.', (protection & PROT_EXEC) ? 'x' : '.' );
- }
-}
-
-void Segment::tempWritable(const ImageLoader::LinkContext& context, const ImageLoader* image)
-{
- vm_address_t addr = this->getActualLoadAddress(image);
- vm_size_t size = this->getSize();
- const bool setCurrentPermissions = false;
- vm_prot_t protection = VM_PROT_WRITE | VM_PROT_READ;
- if ( this->executable() )
- protection |= VM_PROT_EXECUTE;
- kern_return_t r = vm_protect(mach_task_self(), addr, size, setCurrentPermissions, protection);
- if ( r != KERN_SUCCESS )
- throw "can't set vm permissions for mapped segment";
- if ( context.verboseMapping ) {
- dyld::log("%18s at %p->%p altered permissions to %c%c%c\n", this->getName(), (char*)addr, (char*)addr+this->getFileSize()-1,
- (protection & PROT_READ) ? 'r' : '.', (protection & PROT_WRITE) ? 'w' : '.', (protection & PROT_EXEC) ? 'x' : '.' );
- }
-}
-
-
-bool Segment::hasTrailingZeroFill()
-{
- return ( this->writeable() && (this->getSize() > this->getFileSize()) );
-}
-
-
-uintptr_t Segment::reserveAnAddressRange(size_t length, const ImageLoader::LinkContext& context)
-{
- vm_address_t addr = 0;
- vm_size_t size = length;
- // in PIE programs, load initial dylibs after main executable so they don't have fixed addresses either
- if ( fgNextPIEDylibAddress != 0 ) {
- addr = fgNextPIEDylibAddress + (arc4random() & 0x3) * 4096; // add small random padding between dylibs
- kern_return_t r = vm_allocate(mach_task_self(), &addr, size, VM_FLAGS_FIXED);
- if ( r == KERN_SUCCESS ) {
- fgNextPIEDylibAddress = addr + size;
- return addr;
- }
- fgNextPIEDylibAddress = 0;
- }
- kern_return_t r = vm_allocate(mach_task_self(), &addr, size, VM_FLAGS_ANYWHERE);
- if ( r != KERN_SUCCESS )
- throw "out of address space";
-
- return addr;
-}
-
-bool Segment::reserveAddressRange(uintptr_t start, size_t length)
-{
- vm_address_t addr = start;
- vm_size_t size = length;
- kern_return_t r = vm_allocate(mach_task_self(), &addr, size, false /*only this range*/);
- if ( r != KERN_SUCCESS )
- return false;
- return true;
-}
-
-
-