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--- dyld/dyld-44.17/src/ImageLoader.cpp
+++ /dev/null
@@ -1,1052 +0,0 @@
-/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
- *
- * Copyright (c) 2004-2005 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 "ImageLoader.h"
-
-
-uint32_t ImageLoader::fgImagesWithUsedPrebinding = 0;
-uint32_t ImageLoader::fgTotalRebaseFixups = 0;
-uint32_t ImageLoader::fgTotalBindFixups = 0;
-uint32_t ImageLoader::fgTotalLazyBindFixups = 0;
-uint32_t ImageLoader::fgTotalPossibleLazyBindFixups = 0;
-uint64_t ImageLoader::fgTotalLoadLibrariesTime;
-uint64_t ImageLoader::fgTotalRebaseTime;
-uint64_t ImageLoader::fgTotalBindTime;
-uint64_t ImageLoader::fgTotalNotifyTime;
-uint64_t ImageLoader::fgTotalInitTime;
-uintptr_t ImageLoader::fgNextSplitSegAddress = 0x90000000;
-uintptr_t Segment::fgNextNonSplitSegAddress = 0x8FE00000;
-
-
-
-__attribute__((noreturn))
-void throwf(const char* format, ...)
-{
- va_list list;
- char* p;
- va_start(list, format);
- vasprintf(&p, format, list);
- va_end(list);
-
- const char* t = p;
- throw t;
-}
-
-void ImageLoader::init(const char* path, uint64_t offsetInFat, dev_t device, ino_t inode, time_t modDate)
-{
- fPathHash = 0;
- fPath = NULL;
- if ( path != NULL )
- this->setPath(path);
- fLogicalPath = NULL;
- fDevice = device;
- fInode = inode;
- fLastModified = modDate;
- fOffsetInFatFile = offsetInFat;
- //fSegments = NULL;
- fLibraries = NULL;
- fLibrariesCount = 0;
- fReferenceCount = 0;
- fAllLibraryChecksumsAndLoadAddressesMatch = false;
- fLeaveMapped = false;
- fHideSymbols = false;
- fMatchByInstallName = false;
- fLibrariesLoaded = false;
- fBased = false;
- fBoundAllNonLazy = false;
- fBoundAllLazy = false;
- fAnnounced = false;
- fInitialized = false;
- fNextAddImageIndex = 0;
-}
-
-
-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()
-{
- // need to read up on STL and see if this is right way to destruct vector contents
- const unsigned int segmentCount = fSegments.size();
- for(unsigned int i=0; i < segmentCount; ++i){
- Segment* seg = fSegments[i];
- delete seg;
- }
- if ( fPath != NULL )
- delete [] fPath;
- if ( fLogicalPath != NULL )
- delete [] fLogicalPath;
-}
-
-
-void ImageLoader::setPath(const char* path)
-{
- if ( fPath != NULL ) {
- // if duplicate path, do nothing
- if ( strcmp(path, fPath) == 0 )
- return;
- delete [] fPath;
- }
- fPath = new char[strlen(path)+1];
- strcpy((char*)fPath, path);
- 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;
- const unsigned int segmentCount = fSegments.size();
- for(unsigned int i=0; i < segmentCount; ++i){
- fSegments[i]->setUnMapWhenDestructed(false);
- }
-}
-
-void ImageLoader::setHideExports(bool hide)
-{
- fHideSymbols = hide;
-}
-
-bool ImageLoader::hasHiddenExports() const
-{
- return fHideSymbols;
-}
-
-bool ImageLoader::isLinked() const
-{
- return fBoundAllNonLazy;
-}
-
-time_t ImageLoader::lastModified()
-{
- return fLastModified;
-}
-
-bool ImageLoader::containsAddress(const void* addr) const
-{
- const unsigned int segmentCount = fSegments.size();
- for(unsigned int i=0; i < segmentCount; ++i){
- Segment* seg = fSegments[i];
- const uint8_t* start = (const uint8_t*)seg->getActualLoadAddress();
- const uint8_t* end = start + seg->getSize();
- if ( (start <= addr) && (addr < end) && !seg->unaccessible() )
- return true;
- }
- return false;
-}
-
-void ImageLoader::addMappedRegions(RegionsVector& regions) const
-{
- const unsigned int segmentCount = fSegments.size();
- for(unsigned int i=0; i < segmentCount; ++i){
- Segment* seg = fSegments[i];
- MappedRegion region;
- region.address = seg->getActualLoadAddress();
- region.size = seg->getSize();
- regions.push_back(region);
- }
-}
-
-
-void ImageLoader::incrementReferenceCount()
-{
- ++fReferenceCount;
-}
-
-bool ImageLoader::decrementReferenceCount()
-{
- return ( --fReferenceCount == 0 );
-}
-
-// private method that handles circular dependencies by only search any image once
-const ImageLoader::Symbol* ImageLoader::findExportedSymbolInDependentImagesExcept(const char* name, std::set<const ImageLoader*>& dontSearchImages, ImageLoader** foundIn) const
-{
- const ImageLoader::Symbol* sym;
- // search self
- if ( dontSearchImages.count(this) == 0 ) {
- sym = this->findExportedSymbol(name, NULL, false, foundIn);
- if ( sym != NULL )
- return sym;
- dontSearchImages.insert(this);
- }
-
- // search directly dependent libraries
- for (uint32_t i=0; i < fLibrariesCount; ++i) {
- ImageLoader* dependentImage = fLibraries[i].image;
- if ( (dependentImage != NULL) && (dontSearchImages.count(dependentImage) == 0) ) {
- 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) && (dontSearchImages.count(dependentImage) == 0) ) {
- const ImageLoader::Symbol* sym = dependentImage->findExportedSymbolInDependentImagesExcept(name, dontSearchImages, foundIn);
- if ( sym != NULL )
- return sym;
- dontSearchImages.insert(dependentImage);
- }
- }
-
- return NULL;
-}
-
-
-const ImageLoader::Symbol* ImageLoader::findExportedSymbolInDependentImages(const char* name, ImageLoader** foundIn) const
-{
- std::set<const ImageLoader*> dontSearchImages;
- dontSearchImages.insert(this); // don't search this image
- return this->findExportedSymbolInDependentImagesExcept(name, dontSearchImages, foundIn);
-}
-
-const ImageLoader::Symbol* ImageLoader::findExportedSymbolInImageOrDependentImages(const char* name, ImageLoader** foundIn) const
-{
- std::set<const ImageLoader*> dontSearchImages;
- return this->findExportedSymbolInDependentImagesExcept(name, dontSearchImages, foundIn);
-}
-
-
-void ImageLoader::link(const LinkContext& context, BindingLaziness bindness, InitializerRunning inits, uint32_t notifyCount)
-{
- uint64_t t1 = mach_absolute_time();
- this->recursiveLoadLibraries(context);
-
- uint64_t t2 = mach_absolute_time();
- this->recursiveRebase(context);
-
- uint64_t t3 = mach_absolute_time();
- this->recursiveBind(context, bindness);
-
- uint64_t t4 = mach_absolute_time();
- this->recursiveImageNotification(context, notifyCount);
-
- if ( (inits == kRunInitializers) || (inits == kDontRunInitializersButTellObjc) ) {
- std::vector<ImageLoader*> newImages;
- this->recursiveImageAnnouncement(context, newImages); // build bottom up list images being added
- context.notifyAdding(newImages); // tell gdb or anyone who cares about these
- }
-
- uint64_t t5 = mach_absolute_time();
- if ( inits == kRunInitializers ) {
- this->recursiveInitialization(context);
- uint64_t t6 = mach_absolute_time();
- fgTotalInitTime += t6 - t5;
- }
- fgTotalLoadLibrariesTime += t2 - t1;
- fgTotalRebaseTime += t3 - t2;
- fgTotalBindTime += t4 - t3;
- fgTotalNotifyTime += t5 - t4;
-}
-
-
-// only called pre-main on main executable
-// if crt.c is ever cleaned up, this could go away
-void ImageLoader::runInitializers(const LinkContext& context)
-{
- std::vector<ImageLoader*> newImages;
- this->recursiveImageAnnouncement(context, newImages); // build bottom up list images being added
- context.notifyAdding(newImages); // tell gdb or anyone who cares about these
-
- this->recursiveInitialization(context);
-}
-
-// called inside _dyld_register_func_for_add_image()
-void ImageLoader::runNotification(const LinkContext& context, uint32_t notifyCount)
-{
- this->recursiveImageNotification(context, notifyCount);
-}
-
-
-intptr_t ImageLoader::assignSegmentAddresses(const LinkContext& context)
-{
- // preflight and calculate slide if needed
- const unsigned int segmentCount = fSegments.size();
- intptr_t slide = 0;
- if ( this->segmentsCanSlide() && this->segmentsMustSlideTogether() ) {
- bool needsToSlide = false;
- uintptr_t lowAddr = UINTPTR_MAX;
- uintptr_t highAddr = 0;
- for(unsigned int i=0; i < segmentCount; ++i){
- Segment* seg = fSegments[i];
- const uintptr_t segLow = seg->getPreferredLoadAddress();
- const uintptr_t segHigh = segLow + seg->getSize();
- if ( segLow < lowAddr )
- lowAddr = segLow;
- if ( segHigh > highAddr )
- highAddr = segHigh;
-
- if ( context.slideAndPackDylibs || !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(unsigned int i=0; i < segmentCount; ++i){
- Segment* seg = fSegments[i];
- 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 )
- fprintf(stderr, "dyld: Mapping %s\n", this->getPath());
- // find address range for image
- intptr_t slide = this->assignSegmentAddresses(context);
- // map in all segments
- const unsigned int segmentCount = fSegments.size();
- for(unsigned int i=0; i < segmentCount; ++i){
- Segment* seg = fSegments[i];
- seg->map(fd, offsetInFat, slide, context);
- }
- // update slide to reflect load location
- this->setSlide(slide);
-
- // now that it is mapped and slide is set, mark that we should unmap it when done
- for(unsigned int i=0; i < segmentCount; ++i){
- fSegments[i]->setUnMapWhenDestructed(true);
- }
-}
-
-void ImageLoader::mapSegments(const void* memoryImage, uint64_t imageLen, const LinkContext& context)
-{
- if ( context.verboseMapping )
- fprintf(stderr, "dyld: Mapping memory %p\n", memoryImage);
- // find address range for image
- intptr_t slide = this->assignSegmentAddresses(context);
- // map in all segments
- const unsigned int segmentCount = fSegments.size();
- for(unsigned int i=0; i < segmentCount; ++i){
- Segment* seg = fSegments[i];
- seg->map(memoryImage, slide, context);
- }
- // update slide to reflect load location
- this->setSlide(slide);
- // set R/W permissions on all segments at slide location
- for(unsigned int i=0; i < segmentCount; ++i){
- Segment* seg = fSegments[i];
- seg->setPermissions();
- }
-}
-
-bool ImageLoader::allDependentLibrariesAsWhenPreBound() const
-{
- return fAllLibraryChecksumsAndLoadAddressesMatch;
-}
-
-
-void ImageLoader::recursiveLoadLibraries(const LinkContext& context)
-{
- if ( ! fLibrariesLoaded ) {
- // break cycles
- fLibrariesLoaded = true;
-
- // get list of libraries this image needs
- fLibrariesCount = this->doGetDependentLibraryCount();
- fLibraries = new DependentLibrary[fLibrariesCount];
- this->doGetDependentLibraries(fLibraries);
-
- // try to load each
- bool canUsePrelinkingInfo = true;
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- DependentLibrary& requiredLib = fLibraries[i];
- try {
- requiredLib.image = context.loadLibrary(requiredLib.name, true, this->getPath(), NULL);
- if ( requiredLib.image == this ) {
- // found circular reference, perhaps DYLD_LIBARY_PATH is causing this rdar://problem/3684168
- requiredLib.image = context.loadLibrary(requiredLib.name, false, NULL, NULL);
- if ( requiredLib.image != this )
- fprintf(stderr, "dyld: warning DYLD_ setting caused circular dependency in %s\n", this->getPath());
- }
- LibraryInfo actualInfo = requiredLib.image->doGetLibraryInfo();
- requiredLib.checksumMatches = ( actualInfo.checksum == requiredLib.info.checksum );
- // check found library version is compatible
- if ( actualInfo.minVersion < requiredLib.info.minVersion ) {
- throwf("Incompatible library version: %s requires version %d.%d.%d or later, but %s provides version %d.%d.%d",
- this->getShortName(), requiredLib.info.minVersion >> 16, (requiredLib.info.minVersion >> 8) & 0xff, requiredLib.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, (%lld v %lld) for %s referencing %s\n", requiredLib.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 ( requiredLib.required ) {
- const char* formatString = "Library not loaded: %s\n Referenced from: %s\n Reason: %s";
- const char* referencedFrom = this->getPath();
- char buf[strlen(requiredLib.name)+strlen(referencedFrom)+strlen(formatString)+strlen(msg)+2];
- sprintf(buf, formatString, requiredLib.name, referencedFrom, msg);
- fLibrariesLoaded = false;
- throw strdup(buf); // this is a leak if exception doesn't halt program
- }
- // 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& libInfo = fLibraries[i];
- if ( libInfo.image != NULL ) {
- libInfo.isSubFramework = libInfo.image->isSubframeworkOf(context, this);
- libInfo.isReExported = libInfo.isSubFramework || this->hasSubLibrary(context, libInfo.image);
- //if ( libInfo.isReExported )
- // fprintf(stderr, "%s re-exports %s\n", strrchr(this->getPath(), '/'), strrchr(libInfo.image->getPath(),'/'));
- libInfo.image->recursiveLoadLibraries(context);
- }
- }
-
- // 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;
- }
- }
- }
-
- }
-}
-
-void ImageLoader::recursiveRebase(const LinkContext& context)
-{
- if ( ! fBased ) {
- // break cycles
- fBased = true;
-
- 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);
- }
- catch (const char* msg) {
- // this image is not rebased
- fBased = false;
- throw msg;
- }
- }
-}
-
-
-
-
-void ImageLoader::recursiveBind(const LinkContext& context, BindingLaziness bindness)
-{
- // normally just non-lazy pointers are bound up front,
- // but DYLD_BIND_AT_LAUNCH will cause lazy pointers to be bound up from
- // and some dyld API's bind all lazys at runtime
- bool nonLazy = false;
- bool lazy = false;
- switch( bindness ) {
- case kNonLazyOnly:
- nonLazy = true;
- break;
- case kLazyAndNonLazy:
- nonLazy = true;
- lazy = true;
- break;
- case kLazyOnly:
- case kLazyOnlyNoDependents:
- lazy = true;
- break;
- }
- const bool doNonLazy = nonLazy && !fBoundAllNonLazy;
- const bool doLazy = lazy && !fBoundAllLazy;
- if ( doNonLazy || doLazy ) {
- // break cycles
- bool oldBoundAllNonLazy = fBoundAllNonLazy;
- bool oldBoundAllLazy = fBoundAllLazy;
- fBoundAllNonLazy = fBoundAllNonLazy || nonLazy;
- fBoundAllLazy = fBoundAllLazy || lazy;
-
- try {
- // bind lower level libraries first
- if ( bindness != kLazyOnlyNoDependents ) {
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL )
- libInfo.image->recursiveBind(context, bindness);
- }
- }
- // bind this image
- if ( doLazy && !doNonLazy )
- doBind(context, kLazyOnly);
- else if ( !doLazy && doNonLazy )
- doBind(context, kNonLazyOnly);
- else
- doBind(context, kLazyAndNonLazy);
- }
- catch (const char* msg) {
- // restore state
- fBoundAllNonLazy = oldBoundAllNonLazy;
- fBoundAllLazy = oldBoundAllLazy;
- throw msg;
- }
- }
-}
-
-//
-// This is complex because _dyld_register_func_for_add_image() is defined to not only
-// notify you of future image loads, but also of all currently loaded images. Therefore
-// each image needs to track that all add-image-funcs have been notified about it.
-// Since add-image-funcs cannot be removed, each has a unique index and each image
-// records the thru which index notificiation has already been done.
-//
-void ImageLoader::recursiveImageNotification(const LinkContext& context, uint32_t addImageCount)
-{
- if ( fNextAddImageIndex < addImageCount ) {
- // break cycles
- const uint32_t initIndex = fNextAddImageIndex;
- fNextAddImageIndex = addImageCount;
-
- // notify all requestors about this image
- context.imageNotification(this, initIndex);
-
- // notify about lower level libraries first
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL )
- libInfo.image->recursiveImageNotification(context, addImageCount);
- }
- }
-}
-
-
-void ImageLoader::recursiveImageAnnouncement(const LinkContext& context, std::vector<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 gdb about
- newImages.push_back(this);
- //fprintf(stderr, "next size = %d\n", newImages.size());
-
- // remember that this image wants to be notified about other images
- if ( this->hasImageNotification() )
- context.addImageNeedingNotification(this);
- }
-}
-
-
-
-void ImageLoader::recursiveInitialization(const LinkContext& context)
-{
- if ( ! fInitialized ) {
- // break cycles
- fInitialized = true;
-
- try {
- // initialize lower level libraries first
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL )
- libInfo.image->recursiveInitialization(context);
- }
-
- // record termination order
- if ( this->needsTermination() )
- context.terminationRecorder(this);
-
- // initialize this image
- this->doInitialization(context);
- }
- catch (const char* msg) {
- // this image is not initialized
- fInitialized = false;
- throw msg;
- }
- }
-}
-
-void ImageLoader::reprebindCommit(const LinkContext& context, bool commit, bool unmapOld)
-{
- // do nothing on unprebound images
- if ( ! this->isPrebindable() )
- return;
-
- // do nothing if prebinding is up to date
- if ( this->usablePrebinding(context) )
- return;
-
- // make sure we are not replacing a symlink with a file
- char realFilePath[PATH_MAX];
- if ( realpath(this->getPath(), realFilePath) == NULL ) {
- throwf("realpath() failed on %s, errno=%d", this->getPath(), errno);
- }
- // recreate temp file name
- char tempFilePath[strlen(realFilePath)+strlen("_redoprebinding")+2];
- ImageLoader::addSuffix(realFilePath, "_redoprebinding", tempFilePath);
-
- if ( commit ) {
- // all files successfully reprebound, so do swap
- int result = rename(tempFilePath, realFilePath);
- if ( result != 0 ) {
- // if there are two dylibs with the same install path, the second will fail to prebind
- // because the _redoprebinding temp file is gone. In that case, log and go on.
- if ( errno == ENOENT )
- fprintf(stderr, "update_prebinding: temp file missing: %s\n", tempFilePath);
- else
- throwf("can't swap temporary re-prebound file: rename(%s,%s) returned errno=%d", tempFilePath, realFilePath, errno);
- }
- else if ( unmapOld ) {
- this->prebindUnmap(context);
- }
- }
- else {
- // something went wrong during prebinding, delete the temp files
- unlink(tempFilePath);
- }
-}
-
-uint64_t ImageLoader::reprebind(const LinkContext& context, time_t timestamp)
-{
- // do nothing on unprebound images
- if ( ! this->isPrebindable() )
- return INT64_MAX;
-
- // do nothing if prebinding is up to date
- if ( this->usablePrebinding(context) ) {
- if ( context.verbosePrebinding )
- fprintf(stderr, "dyld: no need to re-prebind: %s\n", this->getPath());
- return INT64_MAX;
- }
- // recreate temp file name
- char realFilePath[PATH_MAX];
- if ( realpath(this->getPath(), realFilePath) == NULL ) {
- throwf("realpath() failed on %s, errno=%d", this->getPath(), errno);
- }
- char tempFilePath[strlen(realFilePath)+strlen("_redoprebinding")+2];
- ImageLoader::addSuffix(realFilePath, "_redoprebinding", tempFilePath);
-
- // make copy of file and map it in
- uint8_t* fileToPrebind;
- uint64_t fileToPrebindSize;
- uint64_t freespace = this->copyAndMap(tempFilePath, &fileToPrebind, &fileToPrebindSize);
-
- // do format specific prebinding
- this->doPrebinding(context, timestamp, fileToPrebind);
-
- // flush and swap files
- int result = msync(fileToPrebind, fileToPrebindSize, MS_ASYNC);
- if ( result != 0 )
- throw "error syncing re-prebound file";
- result = munmap(fileToPrebind, fileToPrebindSize);
- if ( result != 0 )
- throw "error unmapping re-prebound file";
-
- // log
- if ( context.verbosePrebinding )
- fprintf(stderr, "dyld: re-prebound: %p %s\n", this->machHeader(), this->getPath());
-
- return freespace;
-}
-
-uint64_t ImageLoader::copyAndMap(const char* tempFile, uint8_t** fileToPrebind, uint64_t* fileToPrebindSize)
-{
- // reopen dylib
- int src = open(this->getPath(), O_RDONLY);
- if ( src == -1 )
- throw "can't open image";
- struct stat stat_buf;
- if ( fstat(src, &stat_buf) == -1)
- throw "can't stat image";
- if ( stat_buf.st_mtime != fLastModified )
- throw "image file changed since it was loaded";
-
- // create new file with all same permissions to hold copy of dylib
- unlink(tempFile);
- int dst = open(tempFile, O_CREAT | O_RDWR | O_TRUNC, stat_buf.st_mode);
- if ( dst == -1 )
- throw "can't create temp image";
-
- // mark source as "don't cache"
- (void)fcntl(src, F_NOCACHE, 1);
- // we want to cache the dst because we are about to map it in and modify it
-
- // copy permission bits
- if ( chmod(tempFile, stat_buf.st_mode & 07777) == -1 )
- throwf("can't chmod temp image. errno=%d for %s", errno, this->getPath());
- if ( chown(tempFile, stat_buf.st_uid, stat_buf.st_gid) == -1)
- throwf("can't chown temp image. errno=%d for %s", errno, this->getPath());
-
- // copy contents
- ssize_t len;
- const uint32_t kBufferSize = 128*1024;
- static uint8_t* buffer = NULL;
- if ( buffer == NULL ) {
- vm_address_t addr = 0;
- if ( vm_allocate(mach_task_self(), &addr, kBufferSize, true /*find range*/) == KERN_SUCCESS )
- buffer = (uint8_t*)addr;
- else
- throw "can't allcoate copy buffer";
- }
- while ( (len = read(src, buffer, kBufferSize)) > 0 ) {
- if ( write(dst, buffer, len) == -1 )
- throwf("write failure copying dylib errno=%d for %s", errno, this->getPath());
- }
-
- // map in dst file
- *fileToPrebindSize = stat_buf.st_size - fOffsetInFatFile; // this may map in too much, but it does not matter
- *fileToPrebind = (uint8_t*)mmap(NULL, *fileToPrebindSize, PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, dst, fOffsetInFatFile);
- if ( *fileToPrebind == (uint8_t*)(-1) )
- throw "can't mmap temp image";
-
- // get free space remaining on dst volume
- struct statfs statfs_buf;
- if ( fstatfs(dst, &statfs_buf) != 0 )
- throwf("can't fstatfs(), errno=%d for %s", errno, tempFile);
- uint64_t freespace = (uint64_t)statfs_buf.f_bavail * (uint64_t)statfs_buf.f_bsize;
-
- // closing notes:
- // ok to close file after mapped in
- // ok to throw above without closing file because the throw will terminate update_prebinding
- int result1 = close(dst);
- int result2 = close(src);
- if ( (result1 != 0) || (result2 != 0) )
- throw "can't close file";
-
- return freespace;
-}
-
-
-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 = timeBaseInfo.denom;
- }
- }
- 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;
- fprintf(stderr, "%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/100;
- uint32_t percentTimesTen = (partTime*1000)/totalTime;
- uint32_t percent = percentTimesTen/10;
- fprintf(stderr, "%s: %u.%u seconds (%u.%u%%)\n", msg, seconds, secondsTimeTen-seconds*10, percent, percentTimesTen-percent*10);
- }
-}
-
-static char* commatize(uint64_t in, char* out)
-{
- char* result = out;
- char rawNum[30];
- sprintf(rawNum, "%llu", in);
- const int rawNumLen = strlen(rawNum);
- for(int i=0; i < rawNumLen-1; ++i) {
- *out++ = rawNum[i];
- if ( ((rawNumLen-i) % 3) == 1 )
- *out++ = ',';
- }
- *out++ = rawNum[rawNumLen-1];
- *out = '\0';
- return result;
-}
-
-
-void ImageLoader::printStatistics(unsigned int imageCount)
-{
- uint64_t totalTime = fgTotalLoadLibrariesTime + fgTotalRebaseTime + fgTotalBindTime + fgTotalNotifyTime + fgTotalInitTime;
- char commaNum1[40];
- char commaNum2[40];
-
- printTime("total time", totalTime, totalTime);
- fprintf(stderr, "total images loaded: %d (%d used prebinding)\n", imageCount, fgImagesWithUsedPrebinding);
- printTime("total images loading time", fgTotalLoadLibrariesTime, totalTime);
- fprintf(stderr, "total rebase fixups: %s\n", commatize(fgTotalRebaseFixups, commaNum1));
- printTime("total rebase fixups time", fgTotalRebaseFixups, totalTime);
- fprintf(stderr, "total binding fixups: %s\n", commatize(fgTotalBindFixups, commaNum1));
- printTime("total binding fixups time", fgTotalBindTime, totalTime);
- fprintf(stderr, "total bindings lazily fixed up: %s of %s\n", commatize(fgTotalLazyBindFixups, commaNum1), commatize(fgTotalPossibleLazyBindFixups, commaNum2));
- printTime("total notify time time", fgTotalNotifyTime, totalTime);
- 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::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;
- }
- void* loadAddress = mmap(requestedLoadAddress, size, protection, MAP_FILE | MAP_FIXED | MAP_PRIVATE, fd, fileOffset);
- if ( loadAddress == ((void*)(-1)) )
- throwf("mmap() error %d at address=0x%08lX, size=0x%08lX in Segment::map() mapping %s", errno, (uintptr_t)requestedLoadAddress, (uintptr_t)size, this->getImage()->getPath());
-
- if ( context.verboseMapping )
- fprintf(stderr, "%18s at %p->%p\n", this->getName(), loadAddress, (char*)loadAddress+this->getFileSize()-1);
-}
-
-void Segment::map(const void* memoryImage, intptr_t slide, 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 )
- fprintf(stderr, "%18s at %p->%p\n", this->getName(), (char*)loadAddress, (char*)loadAddress+this->getFileSize()-1);
-}
-
-void Segment::setPermissions()
-{
- 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();
- 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";
-}
-
-void Segment::tempWritable()
-{
- vm_address_t addr = this->getActualLoadAddress();
- vm_size_t size = this->getSize();
- const bool setCurrentPermissions = false;
- kern_return_t r = vm_protect(mach_task_self(), addr, size, setCurrentPermissions, VM_PROT_WRITE | VM_PROT_READ);
- if ( r != KERN_SUCCESS )
- throw "can't set vm permissions for mapped segment";
-}
-
-
-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;
- if ( context.slideAndPackDylibs ) {
- addr = (fgNextNonSplitSegAddress - length) & (-4096); // page align
- kern_return_t r = vm_allocate(mach_task_self(), &addr, size, false /*use this range*/);
- if ( r != KERN_SUCCESS )
- throw "out of address space";
- fgNextNonSplitSegAddress = addr;
- }
- else {
- kern_return_t r = vm_allocate(mach_task_self(), &addr, size, true /*find range*/);
- 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;
-}
-
-
-