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--- /dev/null
+++ dyld/dyld-43.1/src/ImageLoader.cpp
@@ -0,0 +1,1051 @@
+/* -*- 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);
+ 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 = statfs_buf.f_bavail * 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;
+}
+
+
+