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--- /dev/null
+++ dyld/dyld-44.17/src/dyld.cpp
@@ -0,0 +1,2090 @@
+/* -*- 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@
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/param.h>
+#include <mach/mach_time.h> // mach_absolute_time()
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <mach-o/fat.h>
+#include <mach-o/loader.h>
+#include <libkern/OSByteOrder.h>
+#include <mach/mach.h>
+#include <sys/sysctl.h>
+
+#include <vector>
+
+#include "mach-o/dyld_gdb.h"
+
+#include "dyld.h"
+#include "ImageLoader.h"
+#include "ImageLoaderMachO.h"
+#include "dyldLibSystemThreadHelpers.h"
+
+
+#define CPU_TYPE_MASK 0x00FFFFFF /* complement of CPU_ARCH_MASK */
+
+
+/* implemented in dyld_gdb.cpp */
+void addImagesToAllImages(uint32_t infoCount, const dyld_image_info info[]);
+void removeImageFromAllImages(const mach_header* mh);
+#if OLD_GDB_DYLD_INTERFACE
+void addImageForgdb(const mach_header* mh, uintptr_t slide, const char* physicalPath, const char* logicalPath);
+void removeImageForgdb(const struct mach_header* mh);
+#endif
+
+// magic so CrashReporter logs message
+extern "C" {
+ char error_string[1024];
+}
+
+
+//
+// The file contains the core of dyld used to get a process to main().
+// The API's that dyld supports are implemented in dyldAPIs.cpp.
+//
+//
+//
+//
+//
+
+
+namespace dyld {
+
+
+//
+// state of all environment variables dyld uses
+//
+struct EnvironmentVariables {
+ const char* const * DYLD_FRAMEWORK_PATH;
+ const char* const * DYLD_FALLBACK_FRAMEWORK_PATH;
+ const char* const * DYLD_LIBRARY_PATH;
+ const char* const * DYLD_FALLBACK_LIBRARY_PATH;
+ const char* const * DYLD_ROOT_PATH;
+ const char* const * DYLD_INSERT_LIBRARIES;
+ const char* const * LD_LIBRARY_PATH; // for unix conformance
+ bool DYLD_PRINT_LIBRARIES;
+ bool DYLD_PRINT_LIBRARIES_POST_LAUNCH;
+ bool DYLD_BIND_AT_LAUNCH;
+ bool DYLD_PRINT_STATISTICS;
+ bool DYLD_PRINT_OPTS;
+ bool DYLD_PRINT_ENV;
+ // DYLD_IMAGE_SUFFIX ==> gLinkContext.imageSuffix
+ // DYLD_PRINT_OPTS ==> gLinkContext.verboseOpts
+ // DYLD_PRINT_ENV ==> gLinkContext.verboseEnv
+ // DYLD_FORCE_FLAT_NAMESPACE ==> gLinkContext.bindFlat
+ // DYLD_PRINT_INITIALIZERS ==> gLinkContext.verboseInit
+ // DYLD_PRINT_SEGMENTS ==> gLinkContext.verboseMapping
+ // DYLD_PRINT_BINDINGS ==> gLinkContext.verboseBind
+ // DYLD_PRINT_REBASINGS ==> gLinkContext.verboseRebase
+ // DYLD_PRINT_APIS ==> gLogAPIs
+ // DYLD_IGNORE_PREBINDING ==> gLinkContext.prebindUsage
+ // DYLD_PREBIND_DEBUG ==> gLinkContext.verbosePrebinding
+ // DYLD_NEW_LOCAL_SHARED_REGIONS ==> gLinkContext.sharedRegionMode
+ // DYLD_SHARED_REGION ==> gLinkContext.sharedRegionMode
+ // DYLD_SLIDE_AND_PACK_DYLIBS ==> gLinkContext.slideAndPackDylibs
+ // DYLD_PRINT_WARNINGS ==> gLinkContext.verboseWarnings
+};
+
+// all global state
+static const char* sExecPath = NULL;
+static const struct mach_header* sMainExecutableMachHeader = NULL;
+static cpu_type_t sHostCPU;
+static cpu_subtype_t sHostCPUsubtype;
+static ImageLoader* sMainExecutable = NULL;
+static bool sAllImagesMightContainUnlinkedImages; // necessary until will support dylib unloading
+static std::vector<ImageLoader*> sAllImages;
+static std::vector<ImageLoader*> sImageRoots;
+static std::vector<ImageLoader*> sImageFilesNeedingTermination;
+static std::vector<ImageLoader*> sImagesToNotifyAboutOtherImages;
+static std::vector<ImageCallback> sAddImageCallbacks;
+static std::vector<ImageCallback> sRemoveImageCallbacks;
+static ImageLoader* sLastImageByAddressCache;
+static EnvironmentVariables sEnv;
+static const char* sFrameworkFallbackPaths[] = { "$HOME/Library/Frameworks", "/Library/Frameworks", "/Network/Library/Frameworks", "/System/Library/Frameworks", NULL };
+static const char* sLibraryFallbackPaths[] = { "$HOME/lib", "/usr/local/lib", "/usr/lib", NULL };
+static BundleNotificationCallBack sBundleNotifier = NULL;
+static BundleLocatorCallBack sBundleLocation = NULL;
+static UndefinedHandler sUndefinedHandler = NULL;
+ImageLoader::LinkContext gLinkContext;
+bool gLogAPIs = false;
+const struct ThreadingHelpers* gThreadHelpers = NULL;
+
+
+
+// utility class to assure files are closed when an exception is thrown
+class FileOpener {
+public:
+ FileOpener(const char* path);
+ ~FileOpener();
+ int getFileDescriptor() { return fd; }
+private:
+ int fd;
+};
+
+FileOpener::FileOpener(const char* path)
+{
+ fd = open(path, O_RDONLY, 0);
+}
+
+FileOpener::~FileOpener()
+{
+ close(fd);
+}
+
+
+
+// Objective-C installs an addImage hook to dyld to get notified about new images
+// The callback needs to be run after the image is rebased and bound, but before its initializers are called
+static uint32_t imageNotification(ImageLoader* image, uint32_t startIndex)
+{
+ // tell all register add image handlers about this
+ const uint32_t callbackCount = sAddImageCallbacks.size();
+ for (uint32_t i=startIndex; i < callbackCount; ++i) {
+ ImageCallback cb = sAddImageCallbacks[i];
+ //fprintf(stderr, "dyld: calling add-image-callback[%d]=%p for %s\n", i, cb, image->getPath());
+ (cb)(image->machHeader(), image->getSlide());
+ }
+ return callbackCount;
+}
+
+
+
+// notify gdb et al about these new images
+static void notifyAdding(std::vector<ImageLoader*>& images)
+{
+ // build array
+ unsigned int len = images.size();
+ if ( len != 0 ) {
+ dyld_image_info infos[len];
+ for (unsigned int i=0; i < len; ++i) {
+ dyld_image_info* p = &infos[i];
+ ImageLoader* image = images[i];
+ p->imageLoadAddress = image->machHeader();
+ p->imageFilePath = image->getPath();
+ p->imageFileModDate = image->lastModified();
+ //fprintf(stderr, "notifying objc about %s\n", image->getPath());
+ }
+
+ // tell gdb
+ addImagesToAllImages(len, infos);
+
+ // tell all interested images (after gdb, so you can debug anything the notification does)
+ for (std::vector<ImageLoader*>::iterator it=sImagesToNotifyAboutOtherImages.begin(); it != sImagesToNotifyAboutOtherImages.end(); it++) {
+ (*it)->doNotification(dyld_image_adding, len, infos);
+ }
+ }
+}
+
+
+
+// In order for register_func_for_add_image() callbacks to to be called bottom up,
+// we need to maintain a list of root images. The main executable is usally the
+// first root. Any images dynamically added are also roots (unless already loaded).
+// If DYLD_INSERT_LIBRARIES is used, those libraries are first.
+static void addRootImage(ImageLoader* image)
+{
+ //fprintf(stderr, "addRootImage(%p, %s)\n", image, image->getPath());
+ // add to list of roots
+ sImageRoots.push_back(image);
+}
+
+// Objective-C will contain a __DATA/__image_notify section which contains pointers to a function to call
+// whenever any new image is loaded.
+static void addImageNeedingNotification(ImageLoader* image)
+{
+ sImagesToNotifyAboutOtherImages.push_back(image);
+}
+
+static void addImage(ImageLoader* image)
+{
+ // add to master list
+ sAllImages.push_back(image);
+
+ if ( sEnv.DYLD_PRINT_LIBRARIES || (sEnv.DYLD_PRINT_LIBRARIES_POST_LAUNCH && (sMainExecutable!=NULL) && sMainExecutable->isLinked()) ) {
+ uint64_t offset = image->getOffsetInFatFile();
+ if ( offset == 0 )
+ fprintf(stderr, "dyld: loaded: %s\n", image->getPath());
+ else
+ fprintf(stderr, "dyld: loaded: %s, cpu-sub-type: %d\n", image->getPath(), image->machHeader()->cpusubtype);
+ }
+
+#if OLD_GDB_DYLD_INTERFACE
+ // let gdb find out about this
+ addImageForgdb(image->machHeader(), image->getSlide(), image->getPath(), image->getLogicalPath());
+#endif
+}
+
+void removeImage(ImageLoader* image)
+{
+ // if in termination list, pull it out and run terminator
+ for (std::vector<ImageLoader*>::iterator it=sImageFilesNeedingTermination.begin(); it != sImageFilesNeedingTermination.end(); it++) {
+ if ( *it == image ) {
+ sImageFilesNeedingTermination.erase(it);
+ image->doTermination(gLinkContext);
+ break;
+ }
+ }
+
+ // tell all register add image handlers about this
+ // do this before removing image from internal data structures so that the callback can querey dyld about the image
+ for (std::vector<ImageCallback>::iterator it=sRemoveImageCallbacks.begin(); it != sRemoveImageCallbacks.end(); it++) {
+ (*it)(image->machHeader(), image->getSlide());
+ }
+
+ // tell all interested images
+ for (std::vector<ImageLoader*>::iterator it=sImagesToNotifyAboutOtherImages.begin(); it != sImagesToNotifyAboutOtherImages.end(); it++) {
+ dyld_image_info info;
+ info.imageLoadAddress = image->machHeader();
+ info.imageFilePath = image->getPath();
+ info.imageFileModDate = image->lastModified();
+ (*it)->doNotification(dyld_image_removing, 1, &info);
+ }
+
+ // remove from master list
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ if ( *it == image ) {
+ sAllImages.erase(it);
+ break;
+ }
+ }
+
+ // flush find-by-address cache
+ if ( sLastImageByAddressCache == image )
+ sLastImageByAddressCache = NULL;
+
+ // if in announcement list, pull it out
+ for (std::vector<ImageLoader*>::iterator it=sImagesToNotifyAboutOtherImages.begin(); it != sImagesToNotifyAboutOtherImages.end(); it++) {
+ if ( *it == image ) {
+ sImagesToNotifyAboutOtherImages.erase(it);
+ break;
+ }
+ }
+
+ // if in root list, pull it out
+ for (std::vector<ImageLoader*>::iterator it=sImageRoots.begin(); it != sImageRoots.end(); it++) {
+ if ( *it == image ) {
+ sImageRoots.erase(it);
+ break;
+ }
+ }
+
+ // tell gdb, new way
+ removeImageFromAllImages(image->machHeader());
+
+#if OLD_GDB_DYLD_INTERFACE
+ // tell gdb, old way
+ removeImageForgdb(image->machHeader());
+ gdb_dyld_state_changed();
+#endif
+}
+
+
+static void terminationRecorder(ImageLoader* image)
+{
+ sImageFilesNeedingTermination.push_back(image);
+}
+
+const char* getExecutablePath()
+{
+ return sExecPath;
+}
+
+
+void initializeMainExecutable()
+{
+ const int rootCount = sImageRoots.size();
+ for(int i=0; i < rootCount; ++i) {
+ ImageLoader* image = sImageRoots[i];
+ //fprintf(stderr, "initializeMainExecutable: image = %p\n", image);
+ image->runInitializers(gLinkContext);
+ }
+/*
+ // this does not work???
+ for (std::vector<ImageLoader*>::iterator it=sImageRoots.begin(); it != sImageRoots.end(); it++) {
+ ImageLoader* image = *it;
+ fprintf(stderr, "initializeMainExecutable: image = %p\n", image);
+ // don't know why vector sometimes starts with NULL element???
+ if ( image != NULL )
+ image->runInitializers(gLinkContext);
+ }
+*/
+ if ( sEnv.DYLD_PRINT_STATISTICS )
+ ImageLoaderMachO::printStatistics(sAllImages.size());
+}
+
+bool mainExecutablePrebound()
+{
+ return sMainExecutable->usablePrebinding(gLinkContext);
+}
+
+ImageLoader* mainExecutable()
+{
+ return sMainExecutable;
+}
+
+
+void runTerminators()
+{
+ const unsigned int imageCount = sImageFilesNeedingTermination.size();
+ for(unsigned int i=imageCount; i > 0; --i){
+ ImageLoader* image = sImageFilesNeedingTermination[i-1];
+ image->doTermination(gLinkContext);
+ }
+ sImageFilesNeedingTermination.clear();
+}
+
+
+//
+// Turns a colon separated list of strings
+// into a NULL terminated array of string
+// pointers.
+//
+static const char** parseColonList(const char* list)
+{
+ if ( list[0] == '\0' )
+ return NULL;
+
+ int colonCount = 0;
+ for(const char* s=list; *s != '\0'; ++s) {
+ if (*s == ':')
+ ++colonCount;
+ }
+
+ int index = 0;
+ const char* start = list;
+ char** result = new char*[colonCount+2];
+ for(const char* s=list; *s != '\0'; ++s) {
+ if (*s == ':') {
+ int len = s-start;
+ char* str = new char[len+1];
+ strncpy(str, start, len);
+ str[len] = '\0';
+ start = &s[1];
+ result[index++] = str;
+ }
+ }
+ int len = strlen(start);
+ char* str = new char[len+1];
+ strcpy(str, start);
+ result[index++] = str;
+ result[index] = NULL;
+
+ return (const char**)result;
+}
+
+/*
+ * Library path searching is not done for setuid programs
+ * which are not run by the real user. Futher the
+ * evironment varaible for the library path is cleared so
+ * that if this program executes a non-set uid program this
+ * part of the evironment will not be passed along so that
+ * that program also will not have it's libraries searched
+ * for.
+ */
+ static bool riskyUser()
+ {
+ static bool checked = false;
+ static bool risky = false;
+ if ( !checked ) {
+ risky = ( getuid() != 0 && (getuid() != geteuid() || getgid() != getegid()) );
+ checked = true;
+ }
+ return risky;
+ }
+
+
+static bool disableIfBadUser(char* rhs)
+{
+ bool didDisable = false;
+ if ( riskyUser() ) {
+ *rhs ='\0';
+ didDisable = true;
+ }
+ return didDisable;
+}
+
+static void paths_expand_roots(const char **paths, const char *key, const char *val)
+{
+// assert(val != NULL);
+// assert(paths != NULL);
+ if(NULL != key) {
+ size_t keyLen = strlen(key);
+ for(int i=0; paths[i] != NULL; ++i) {
+ if ( strncmp(paths[i], key, keyLen) == 0 ) {
+ char* newPath = new char[strlen(val) + (strlen(paths[i]) - keyLen) + 1];
+ strcpy(newPath, val);
+ strcat(newPath, &paths[i][keyLen]);
+ paths[i] = newPath;
+ }
+ }
+ }
+ return;
+}
+
+static void removePathWithPrefix(const char* paths[], const char* prefix)
+{
+ size_t prefixLen = strlen(prefix);
+ for(int s=0,d=0; (paths[d] != NULL) && (paths[s] != NULL); ++s, ++d) {
+ if ( strncmp(paths[s], prefix, prefixLen) == 0 )
+ ++s;
+ paths[d] = paths[s];
+ }
+}
+
+#if 0
+static void paths_dump(const char **paths)
+{
+// assert(paths != NULL);
+ const char **strs = paths;
+ while(*strs != NULL)
+ {
+ fprintf(stderr, "\"%s\"\n", *strs);
+ strs++;
+ }
+ return;
+}
+#endif
+
+static void printOptions(const char* argv[])
+{
+ uint32_t i = 0;
+ while ( NULL != argv[i] ) {
+ fprintf(stderr, "opt[%i] = \"%s\"\n", i, argv[i]);
+ i++;
+ }
+}
+
+static void printEnvironmentVariables(const char* envp[])
+{
+ while ( NULL != *envp ) {
+ fprintf(stderr, "%s\n", *envp);
+ envp++;
+ }
+}
+
+
+
+void processDyldEnvironmentVarible(const char* key, const char* value)
+{
+ if ( strcmp(key, "DYLD_FRAMEWORK_PATH") == 0 ) {
+ if ( !disableIfBadUser((char*)value) )
+ sEnv.DYLD_FRAMEWORK_PATH = parseColonList(value);
+ }
+ else if ( strcmp(key, "DYLD_FALLBACK_FRAMEWORK_PATH") == 0 ) {
+ if ( !disableIfBadUser((char*)value) )
+ sEnv.DYLD_FALLBACK_FRAMEWORK_PATH = parseColonList(value);
+ }
+ else if ( strcmp(key, "DYLD_LIBRARY_PATH") == 0 ) {
+ if ( !disableIfBadUser((char*)value) )
+ sEnv.DYLD_LIBRARY_PATH = parseColonList(value);
+ }
+ else if ( strcmp(key, "DYLD_FALLBACK_LIBRARY_PATH") == 0 ) {
+ if ( !disableIfBadUser((char*)value) )
+ sEnv.DYLD_FALLBACK_LIBRARY_PATH = parseColonList(value);
+ }
+ else if ( (strcmp(key, "DYLD_ROOT_PATH") == 0) || (strcmp(key, "DYLD_PATHS_ROOT") == 0) ) {
+ if ( !disableIfBadUser((char*)value) ) {
+ if ( strcmp(value, "/") != 0 ) {
+ sEnv.DYLD_ROOT_PATH = parseColonList(value);
+ for (int i=0; sEnv.DYLD_ROOT_PATH[i] != NULL; ++i) {
+ if ( sEnv.DYLD_ROOT_PATH[i][0] != '/' ) {
+ fprintf(stderr, "dyld: warning DYLD_ROOT_PATH not used because it contains a non-absolute path\n");
+ sEnv.DYLD_ROOT_PATH = NULL;
+ break;
+ }
+ }
+ }
+ }
+ }
+ else if ( strcmp(key, "DYLD_IMAGE_SUFFIX") == 0 ) {
+ if ( !disableIfBadUser((char*)value) )
+ gLinkContext.imageSuffix = value;
+ }
+ else if ( strcmp(key, "DYLD_INSERT_LIBRARIES") == 0 ) {
+ if ( !disableIfBadUser((char*)value) )
+ sEnv.DYLD_INSERT_LIBRARIES = parseColonList(value);
+ }
+ else if ( strcmp(key, "DYLD_DEBUG_TRACE") == 0 ) {
+ fprintf(stderr, "dyld: warning DYLD_DEBUG_TRACE not supported\n");
+ }
+ else if ( strcmp(key, "DYLD_ERROR_PRINT") == 0 ) {
+ fprintf(stderr, "dyld: warning DYLD_ERROR_PRINT not supported\n");
+ }
+ else if ( strcmp(key, "DYLD_PRINT_OPTS") == 0 ) {
+ sEnv.DYLD_PRINT_OPTS = true;
+ }
+ else if ( strcmp(key, "DYLD_PRINT_ENV") == 0 ) {
+ sEnv.DYLD_PRINT_ENV = true;
+ }
+ else if ( strcmp(key, "DYLD_PRINT_LIBRARIES") == 0 ) {
+ sEnv.DYLD_PRINT_LIBRARIES = true;
+ }
+ else if ( strcmp(key, "DYLD_PRINT_LIBRARIES_POST_LAUNCH") == 0 ) {
+ sEnv.DYLD_PRINT_LIBRARIES_POST_LAUNCH = true;
+ }
+ else if ( strcmp(key, "DYLD_TRACE") == 0 ) {
+ fprintf(stderr, "dyld: warning DYLD_TRACE not supported\n");
+ }
+ else if ( strcmp(key, "DYLD_EBADEXEC_ONLY") == 0 ) {
+ fprintf(stderr, "dyld: warning DYLD_EBADEXEC_ONLY not supported\n");
+ }
+ else if ( strcmp(key, "DYLD_BIND_AT_LAUNCH") == 0 ) {
+ sEnv.DYLD_BIND_AT_LAUNCH = true;
+ }
+ else if ( strcmp(key, "DYLD_FORCE_FLAT_NAMESPACE") == 0 ) {
+ gLinkContext.bindFlat = true;
+ }
+ else if ( strcmp(key, "DYLD_DEAD_LOCK_HANG") == 0 ) {
+ fprintf(stderr, "dyld: warning DYLD_DEAD_LOCK_HANG not supported\n");
+ }
+ else if ( strcmp(key, "DYLD_ABORT_MULTIPLE_INITS") == 0 ) {
+ fprintf(stderr, "dyld: warning DYLD_ABORT_MULTIPLE_INITS not supported\n");
+ }
+ else if ( strcmp(key, "DYLD_NEW_LOCAL_SHARED_REGIONS") == 0 ) {
+ gLinkContext.sharedRegionMode = ImageLoader::kUsePrivateSharedRegion;
+ }
+ else if ( strcmp(key, "DYLD_SLIDE_AND_PACK_DYLIBS") == 0 ) {
+ gLinkContext.slideAndPackDylibs = true;
+ }
+ else if ( strcmp(key, "DYLD_NO_FIX_PREBINDING") == 0 ) {
+ // since the new dyld never runs fix_prebinding, no need to warn if someone does not want it run
+ //fprintf(stderr, "dyld: warning DYLD_NO_FIX_PREBINDING not supported\n");
+ }
+ else if ( strcmp(key, "DYLD_PREBIND_DEBUG") == 0 ) {
+ gLinkContext.verbosePrebinding = true;
+ }
+ else if ( strcmp(key, "DYLD_HINTS_DEBUG") == 0 ) {
+ fprintf(stderr, "dyld: warning DYLD_HINTS_DEBUG not supported\n");
+ }
+ else if ( strcmp(key, "DYLD_SAMPLE_DEBUG") == 0 ) {
+ fprintf(stderr, "dyld: warning DYLD_SAMPLE_DEBUG not supported\n");
+ }
+ else if ( strcmp(key, "DYLD_EXECUTABLE_PATH_DEBUG") == 0 ) {
+ fprintf(stderr, "dyld: warning DYLD_EXECUTABLE_PATH_DEBUG not supported\n");
+ }
+ else if ( strcmp(key, "DYLD_TWO_LEVEL_DEBUG") == 0 ) {
+ fprintf(stderr, "dyld: warning DYLD_TWO_LEVEL_DEBUG not supported\n");
+ }
+ else if ( strcmp(key, "DYLD_LAZY_INITIALIZERS") == 0 ) {
+ fprintf(stderr, "dyld: warning DYLD_LAZY_INITIALIZERS not supported\n");
+ }
+ else if ( strcmp(key, "DYLD_PRINT_INITIALIZERS") == 0 ) {
+ gLinkContext.verboseInit = true;
+ }
+ else if ( strcmp(key, "DYLD_PRINT_STATISTICS") == 0 ) {
+ sEnv.DYLD_PRINT_STATISTICS = true;
+ }
+ else if ( strcmp(key, "DYLD_PRINT_SEGMENTS") == 0 ) {
+ gLinkContext.verboseMapping = true;
+ }
+ else if ( strcmp(key, "DYLD_PRINT_BINDINGS") == 0 ) {
+ gLinkContext.verboseBind = true;
+ }
+ else if ( strcmp(key, "DYLD_PRINT_REBASINGS") == 0 ) {
+ gLinkContext.verboseRebase = true;
+ }
+ else if ( strcmp(key, "DYLD_PRINT_APIS") == 0 ) {
+ gLogAPIs = true;
+ }
+ else if ( strcmp(key, "DYLD_PRINT_WARNINGS") == 0 ) {
+ gLinkContext.verboseWarnings = true;
+ }
+ else if ( strcmp(key, "DYLD_SHARED_REGION") == 0 ) {
+ if ( strcmp(value, "private") == 0 ) {
+ gLinkContext.sharedRegionMode = ImageLoader::kUsePrivateSharedRegion;
+ }
+ else if ( strcmp(value, "avoid") == 0 ) {
+ gLinkContext.sharedRegionMode = ImageLoader::kDontUseSharedRegion;
+ }
+ else if ( strcmp(value, "use") == 0 ) {
+ gLinkContext.sharedRegionMode = ImageLoader::kUseSharedRegion;
+ }
+ else if ( value[0] == '\0' ) {
+ gLinkContext.sharedRegionMode = ImageLoader::kUseSharedRegion;
+ }
+ else {
+ fprintf(stderr, "dyld: warning unknown option to DYLD_SHARED_REGION. Valid options are: use, private, avoid\n");
+ }
+ }
+ else if ( strcmp(key, "DYLD_IGNORE_PREBINDING") == 0 ) {
+ if ( strcmp(value, "all") == 0 ) {
+ gLinkContext.prebindUsage = ImageLoader::kUseNoPrebinding;
+ }
+ else if ( strcmp(value, "app") == 0 ) {
+ gLinkContext.prebindUsage = ImageLoader::kUseAllButAppPredbinding;
+ }
+ else if ( strcmp(value, "nonsplit") == 0 ) {
+ gLinkContext.prebindUsage = ImageLoader::kUseSplitSegPrebinding;
+ }
+ else if ( value[0] == '\0' ) {
+ gLinkContext.prebindUsage = ImageLoader::kUseSplitSegPrebinding;
+ }
+ else {
+ fprintf(stderr, "dyld: warning unknown option to DYLD_IGNORE_PREBINDING. Valid options are: all, app, nonsplit\n");
+ }
+ }
+ else {
+ fprintf(stderr, "dyld: warning, unknown environment variable: %s\n", key);
+ }
+}
+
+static void checkEnvironmentVariables(const char* envp[], bool ignoreEnviron)
+{
+ const char* home = NULL;
+ const char** p;
+ for(p = envp; *p != NULL; p++) {
+ const char* keyEqualsValue = *p;
+ if ( strncmp(keyEqualsValue, "DYLD_", 5) == 0 ) {
+ const char* equals = strchr(keyEqualsValue, '=');
+ if ( (equals != NULL) && !ignoreEnviron ) {
+ const char* value = &equals[1];
+ const int keyLen = equals-keyEqualsValue;
+ char key[keyLen+1];
+ strncpy(key, keyEqualsValue, keyLen);
+ key[keyLen] = '\0';
+ processDyldEnvironmentVarible(key, value);
+ }
+ }
+ else if ( strncmp(keyEqualsValue, "HOME=", 5) == 0 ) {
+ home = &keyEqualsValue[5];
+ }
+ else if ( strncmp(keyEqualsValue, "LD_LIBRARY_PATH=", 16) == 0 ) {
+ const char* path = &keyEqualsValue[16];
+ if ( !disableIfBadUser((char*)path) )
+ sEnv.LD_LIBRARY_PATH = parseColonList(path);
+ }
+ }
+
+ // default value for DYLD_FALLBACK_FRAMEWORK_PATH, if not set in environment
+ if ( sEnv.DYLD_FALLBACK_FRAMEWORK_PATH == NULL ) {
+ const char** paths = sFrameworkFallbackPaths;
+ if ( home != NULL ) {
+ if ( riskyUser() )
+ removePathWithPrefix(paths, "$HOME");
+ else
+ paths_expand_roots(paths, "$HOME", home);
+ }
+ sEnv.DYLD_FALLBACK_FRAMEWORK_PATH = paths;
+ }
+
+ // default value for DYLD_FALLBACK_LIBRARY_PATH, if not set in environment
+ if ( sEnv.DYLD_FALLBACK_LIBRARY_PATH == NULL ) {
+ const char** paths = sLibraryFallbackPaths;
+ if ( home != NULL ) {
+ if ( riskyUser() )
+ removePathWithPrefix(paths, "$HOME");
+ else
+ paths_expand_roots(paths, "$HOME", home);
+ }
+ sEnv.DYLD_FALLBACK_LIBRARY_PATH = paths;
+ }
+}
+
+
+static void getHostInfo()
+{
+#if 0
+ struct host_basic_info info;
+ mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
+ mach_port_t hostPort = mach_host_self();
+ kern_return_t result = host_info(hostPort, HOST_BASIC_INFO, (host_info_t)&info, &count);
+ mach_port_deallocate(mach_task_self(), hostPort);
+ if ( result != KERN_SUCCESS )
+ throw "host_info() failed";
+
+ sHostCPU = info.cpu_type;
+ sHostCPUsubtype = info.cpu_subtype;
+#endif
+
+ size_t valSize = sizeof(sHostCPU);
+ if (sysctlbyname ("hw.cputype", &sHostCPU, &valSize, NULL, 0) != 0)
+ throw "sysctlbyname(hw.cputype) failed";
+ valSize = sizeof(sHostCPUsubtype);
+ if (sysctlbyname ("hw.cpusubtype", &sHostCPUsubtype, &valSize, NULL, 0) != 0)
+ throw "sysctlbyname(hw.cpusubtype) failed";
+}
+
+bool validImage(ImageLoader* possibleImage)
+{
+ const unsigned int imageCount = sAllImages.size();
+ for(unsigned int i=0; i < imageCount; ++i) {
+ if ( possibleImage == sAllImages[i] ) {
+ return true;
+ }
+ }
+ return false;
+}
+
+uint32_t getImageCount()
+{
+ if ( sAllImagesMightContainUnlinkedImages ) {
+ uint32_t count = 0;
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ if ( (*it)->isLinked() )
+ ++count;
+ }
+ return count;
+ }
+ else {
+ return sAllImages.size();
+ }
+}
+
+ImageLoader* getIndexedImage(unsigned int index)
+{
+ if ( sAllImagesMightContainUnlinkedImages ) {
+ uint32_t count = 0;
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ if ( (*it)->isLinked() ) {
+ if ( index == count )
+ return *it;
+ ++count;
+ }
+ }
+ }
+ else {
+ if ( index < sAllImages.size() )
+ return sAllImages[index];
+ }
+ return NULL;
+}
+
+ImageLoader* findImageByMachHeader(const struct mach_header* target)
+{
+ const unsigned int imageCount = sAllImages.size();
+ for(unsigned int i=0; i < imageCount; ++i) {
+ ImageLoader* anImage = sAllImages[i];
+ if ( anImage->machHeader() == target )
+ return anImage;
+ }
+ return NULL;
+}
+
+
+ImageLoader* findImageContainingAddress(const void* addr)
+{
+#if FIND_STATS
+ static int cacheHit = 0;
+ static int cacheMiss = 0;
+ static int cacheNotMacho = 0;
+ if ( ((cacheHit+cacheMiss+cacheNotMacho) % 100) == 0 )
+ fprintf(stderr, "findImageContainingAddress(): cache hit = %d, miss = %d, unknown = %d\n", cacheHit, cacheMiss, cacheNotMacho);
+#endif
+ // first look in image where last address was found rdar://problem/3685517
+ if ( (sLastImageByAddressCache != NULL) && sLastImageByAddressCache->containsAddress(addr) ) {
+#if FIND_STATS
+ ++cacheHit;
+#endif
+ return sLastImageByAddressCache;
+ }
+ // do exhastive search
+ // todo: consider maintaining a list sorted by address ranges and do a binary search on that
+ const unsigned int imageCount = sAllImages.size();
+ for(unsigned int i=0; i < imageCount; ++i) {
+ ImageLoader* anImage = sAllImages[i];
+ if ( anImage->containsAddress(addr) ) {
+ sLastImageByAddressCache = anImage;
+#if FIND_STATS
+ ++cacheMiss;
+#endif
+ return anImage;
+ }
+ }
+#if FIND_STATS
+ ++cacheNotMacho;
+#endif
+ return NULL;
+}
+
+ImageLoader* findImageContainingAddressThreadSafe(const void* addr)
+{
+ // do exhastive search
+ // todo: consider maintaining a list sorted by address ranges and do a binary search on that
+ const unsigned int imageCount = sAllImages.size();
+ for(unsigned int i=0; i < imageCount; ++i) {
+ ImageLoader* anImage = sAllImages[i];
+ if ( anImage->containsAddress(addr) ) {
+ return anImage;
+ }
+ }
+ return NULL;
+}
+
+
+void forEachImageDo( void (*callback)(ImageLoader*, void* userData), void* userData)
+{
+ const unsigned int imageCount = sAllImages.size();
+ for(unsigned int i=0; i < imageCount; ++i) {
+ ImageLoader* anImage = sAllImages[i];
+ (*callback)(anImage, userData);
+ }
+}
+
+ImageLoader* findLoadedImage(const struct stat& stat_buf)
+{
+ const unsigned int imageCount = sAllImages.size();
+ for(unsigned int i=0; i < imageCount; ++i){
+ ImageLoader* anImage = sAllImages[i];
+ if ( anImage->statMatch(stat_buf) )
+ return anImage;
+ }
+ return NULL;
+}
+
+// based on ANSI-C strstr()
+static const char* strrstr(const char* str, const char* sub)
+{
+ const int sublen = strlen(sub);
+ for(const char* p = &str[strlen(str)]; p != str; --p) {
+ if ( strncmp(p, sub, sublen) == 0 )
+ return p;
+ }
+ return NULL;
+}
+
+
+//
+// Find framework path
+//
+// /path/foo.framework/foo => foo.framework/foo
+// /path/foo.framework/Versions/A/foo => foo.framework/Versions/A/foo
+// /path/foo.framework/Frameworks/bar.framework/bar => bar.framework/bar
+// /path/foo.framework/Libraries/bar.dylb => NULL
+// /path/foo.framework/bar => NULL
+//
+// Returns NULL if not a framework path
+//
+static const char* getFrameworkPartialPath(const char* path)
+{
+ const char* dirDot = strrstr(path, ".framework/");
+ if ( dirDot != NULL ) {
+ const char* dirStart = dirDot;
+ for ( ; dirStart >= path; --dirStart) {
+ if ( (*dirStart == '/') || (dirStart == path) ) {
+ const char* frameworkStart = &dirStart[1];
+ if ( dirStart == path )
+ --frameworkStart;
+ int len = dirDot - frameworkStart;
+ char framework[len+1];
+ strncpy(framework, frameworkStart, len);
+ framework[len] = '\0';
+ const char* leaf = strrchr(path, '/');
+ if ( leaf != NULL ) {
+ if ( strcmp(framework, &leaf[1]) == 0 ) {
+ return frameworkStart;
+ }
+ if ( gLinkContext.imageSuffix != NULL ) {
+ // some debug frameworks have install names that end in _debug
+ if ( strncmp(framework, &leaf[1], len) == 0 ) {
+ if ( strcmp( gLinkContext.imageSuffix, &leaf[len+1]) == 0 )
+ return frameworkStart;
+ }
+ }
+ }
+ }
+ }
+ }
+ return NULL;
+}
+
+
+static const char* getLibraryLeafName(const char* path)
+{
+ const char* start = strrchr(path, '/');
+ if ( start != NULL )
+ return &start[1];
+ else
+ return path;
+}
+
+
+
+const cpu_subtype_t CPU_SUBTYPE_END_OF_LIST = -1;
+
+
+//
+// A fat file may contain multiple sub-images for the same CPU type.
+// In that case, dyld picks which sub-image to use by scanning a table
+// of preferred cpu-sub-types for the running cpu.
+//
+// There is one row in the table for each cpu-sub-type on which dyld might run.
+// The first entry in a row is that cpu-sub-type. It is followed by all
+// cpu-sub-types that can run on that cpu, if preferred order. Each row ends with
+// a "SUBTYPE_ALL" (to denote that images written to run on any cpu-sub-type are usable),
+// followed by one or more CPU_SUBTYPE_END_OF_LIST to pad out this row.
+//
+
+
+//
+// 32-bit PowerPC sub-type lists
+//
+const int kPPC_RowCount = 4;
+static const cpu_subtype_t kPPC32[kPPC_RowCount][6] = {
+ // G5 can run any code
+ { CPU_SUBTYPE_POWERPC_970, CPU_SUBTYPE_POWERPC_7450, CPU_SUBTYPE_POWERPC_7400, CPU_SUBTYPE_POWERPC_750, CPU_SUBTYPE_POWERPC_ALL, CPU_SUBTYPE_END_OF_LIST },
+
+ // G4 can run all but G5 code
+ { CPU_SUBTYPE_POWERPC_7450, CPU_SUBTYPE_POWERPC_7400, CPU_SUBTYPE_POWERPC_750, CPU_SUBTYPE_POWERPC_ALL, CPU_SUBTYPE_END_OF_LIST, CPU_SUBTYPE_END_OF_LIST },
+ { CPU_SUBTYPE_POWERPC_7400, CPU_SUBTYPE_POWERPC_7450, CPU_SUBTYPE_POWERPC_750, CPU_SUBTYPE_POWERPC_ALL, CPU_SUBTYPE_END_OF_LIST, CPU_SUBTYPE_END_OF_LIST },
+
+ // G3 cannot run G4 or G5 code
+ { CPU_SUBTYPE_POWERPC_750, CPU_SUBTYPE_POWERPC_ALL, CPU_SUBTYPE_END_OF_LIST, CPU_SUBTYPE_END_OF_LIST, CPU_SUBTYPE_END_OF_LIST, CPU_SUBTYPE_END_OF_LIST }
+};
+
+
+//
+// 64-bit PowerPC sub-type lists
+//
+const int kPPC64_RowCount = 1;
+static const cpu_subtype_t kPPC64[kPPC64_RowCount][3] = {
+ // G5 can run any 64-bit code
+ { CPU_SUBTYPE_POWERPC_970, CPU_SUBTYPE_POWERPC_ALL, CPU_SUBTYPE_END_OF_LIST },
+};
+
+
+
+//
+// 32-bit x86 sub-type lists
+//
+// TO-DO
+
+
+
+// scan the tables above to find the cpu-sub-type-list for this machine
+static const cpu_subtype_t* findCPUSubtypeList(cpu_type_t cpu, cpu_subtype_t subtype)
+{
+ switch (cpu) {
+ case CPU_TYPE_POWERPC:
+ for (int i=0; i < kPPC_RowCount ; ++i) {
+ if ( kPPC32[i][0] == subtype )
+ return kPPC32[i];
+ }
+ break;
+ case CPU_TYPE_POWERPC64:
+ for (int i=0; i < kPPC64_RowCount ; ++i) {
+ if ( kPPC64[i][0] == subtype )
+ return kPPC64[i];
+ }
+ break;
+ case CPU_TYPE_I386:
+ // To do
+ break;
+ }
+ return NULL;
+}
+
+
+
+
+// scan fat table-of-contents for best most preferred subtype
+static bool fatFindBestFromOrderedList(cpu_type_t cpu, const cpu_subtype_t list[], const fat_header* fh, uint64_t* offset, uint64_t* len)
+{
+ const fat_arch* const archs = (fat_arch*)(((char*)fh)+sizeof(fat_header));
+ for (uint32_t subTypeIndex=0; list[subTypeIndex] != CPU_SUBTYPE_END_OF_LIST; ++subTypeIndex) {
+ for(uint32_t fatIndex=0; fatIndex < OSSwapBigToHostInt32(fh->nfat_arch); ++fatIndex) {
+ if ( ((cpu_type_t)OSSwapBigToHostInt32(archs[fatIndex].cputype) == cpu)
+ && (list[subTypeIndex] == archs[fatIndex].cpusubtype) ) {
+ *offset = OSSwapBigToHostInt32(archs[fatIndex].offset);
+ *len = OSSwapBigToHostInt32(archs[fatIndex].size);
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+// scan fat table-of-contents for exact match of cpu and cpu-sub-type
+static bool fatFindExactMatch(cpu_type_t cpu, cpu_subtype_t subtype, const fat_header* fh, uint64_t* offset, uint64_t* len)
+{
+ const fat_arch* archs = (fat_arch*)(((char*)fh)+sizeof(fat_header));
+ for(uint32_t i=0; i < OSSwapBigToHostInt32(fh->nfat_arch); ++i) {
+ if ( ((cpu_type_t)OSSwapBigToHostInt32(archs[i].cputype) == cpu)
+ && ((cpu_subtype_t)OSSwapBigToHostInt32(archs[i].cpusubtype) == subtype) ) {
+ *offset = OSSwapBigToHostInt32(archs[i].offset);
+ *len = OSSwapBigToHostInt32(archs[i].size);
+ return true;
+ }
+ }
+ return false;
+}
+
+// scan fat table-of-contents for image with matching cpu-type and runs-on-all-sub-types
+static bool fatFindRunsOnAllCPUs(cpu_type_t cpu, const fat_header* fh, uint64_t* offset, uint64_t* len)
+{
+ const fat_arch* archs = (fat_arch*)(((char*)fh)+sizeof(fat_header));
+ for(uint32_t i=0; i < OSSwapBigToHostInt32(fh->nfat_arch); ++i) {
+ if ( (cpu_type_t)OSSwapBigToHostInt32(archs[i].cputype) == cpu) {
+ switch (cpu) {
+ case CPU_TYPE_POWERPC:
+ case CPU_TYPE_POWERPC64:
+ if ( (cpu_subtype_t)OSSwapBigToHostInt32(archs[i].cpusubtype) == CPU_SUBTYPE_POWERPC_ALL ) {
+ *offset = OSSwapBigToHostInt32(archs[i].offset);
+ *len = OSSwapBigToHostInt32(archs[i].size);
+ return true;
+ }
+ break;
+ case CPU_TYPE_I386:
+ if ( (cpu_subtype_t)OSSwapBigToHostInt32(archs[i].cpusubtype) == CPU_SUBTYPE_I386_ALL ) {
+ *offset = OSSwapBigToHostInt32(archs[i].offset);
+ *len = OSSwapBigToHostInt32(archs[i].size);
+ return true;
+ }
+ break;
+ }
+ }
+ }
+ return false;
+}
+
+
+//
+// A fat file may contain multiple sub-images for the same cpu-type,
+// each optimized for a different cpu-sub-type (e.g G3 or G5).
+// This routine picks the optimal sub-image.
+//
+static bool fatFindBest(const fat_header* fh, uint64_t* offset, uint64_t* len)
+{
+ // assume all dylibs loaded must have same cpu type as main executable
+ const cpu_type_t cpu = sMainExecutableMachHeader->cputype;
+
+ // We only know the subtype to use if the main executable cpu type matches the host
+ if ( (cpu & CPU_TYPE_MASK) == sHostCPU ) {
+ // get preference ordered list of subtypes
+ const cpu_subtype_t* subTypePreferenceList = findCPUSubtypeList(cpu, sHostCPUsubtype);
+
+ // use ordered list to find best sub-image in fat file
+ if ( subTypePreferenceList != NULL )
+ return fatFindBestFromOrderedList(cpu, subTypePreferenceList, fh, offset, len);
+
+ // if running cpu is not in list, try for an exact match
+ if ( fatFindExactMatch(cpu, sHostCPUsubtype, fh, offset, len) )
+ return true;
+ }
+
+ // running on an uknown cpu, can only load generic code
+ return fatFindRunsOnAllCPUs(cpu, fh, offset, len);
+}
+
+
+
+//
+// This is used to validate if a non-fat (aka thin or raw) mach-o file can be used
+// on the current processor. It is deemed compatible if any of the following are true:
+// 1) mach_header subtype is in list of compatible subtypes for running processor
+// 2) mach_header subtype is same as running processor subtype
+// 3) mach_header subtype runs on all processor variants
+//
+//
+bool isCompatibleMachO(const uint8_t* firstPage)
+{
+ const mach_header* mh = (mach_header*)firstPage;
+ if ( mh->magic == sMainExecutableMachHeader->magic ) {
+ if ( mh->cputype == sMainExecutableMachHeader->cputype ) {
+ if ( (mh->cputype & CPU_TYPE_MASK) == sHostCPU ) {
+ // get preference ordered list of subtypes that this machine can use
+ const cpu_subtype_t* subTypePreferenceList = findCPUSubtypeList(mh->cputype, sHostCPUsubtype);
+ if ( subTypePreferenceList != NULL ) {
+ // if image's subtype is in the list, it is compatible
+ for (const cpu_subtype_t* p = subTypePreferenceList; *p != CPU_SUBTYPE_END_OF_LIST; ++p) {
+ if ( *p == mh->cpusubtype )
+ return true;
+ }
+ // have list and not in list, so not compatible
+ throw "incompatible cpu-subtype";
+ }
+ // unknown cpu sub-type, but if exact match for current subtype then ok to use
+ if ( mh->cpusubtype == sHostCPUsubtype )
+ return true;
+ }
+
+ // cpu unknown, so don't know if subtype is compatible
+ // only load _ALL variant
+ switch (mh->cputype) {
+ case CPU_TYPE_POWERPC:
+ case CPU_TYPE_POWERPC64:
+ if ( mh->cpusubtype == CPU_SUBTYPE_POWERPC_ALL )
+ return true;
+ break;
+ case CPU_TYPE_I386:
+ if ( mh->cpusubtype == CPU_SUBTYPE_I386_ALL )
+ return true;
+ break;
+ }
+ }
+ }
+ return false;
+}
+
+
+// The kernel maps in main executable before dyld gets control. We need to
+// make an ImageLoader* for the already mapped in main executable.
+static ImageLoader* instantiateFromLoadedImage(const struct mach_header* mh, const char* path)
+{
+ // try mach-o loader
+ if ( isCompatibleMachO((const uint8_t*)mh) ) {
+ ImageLoader* image = new ImageLoaderMachO(path, mh, 0, gLinkContext);
+ addImage(image);
+ return image;
+ }
+
+ return NULL;
+}
+
+
+
+
+// map in file and instantiate an ImageLoader
+static ImageLoader* loadPhase6(int fd, struct stat& stat_buf, const char* path, const LoadContext& context)
+{
+ //fprintf(stderr, "%s(%s)\n", __func__ , path);
+ uint64_t fileOffset = 0;
+ uint64_t fileLength = stat_buf.st_size;
+#if __ppc64__
+ if ( *((uint32_t*)((char*)(&stat_buf)+0x60)) == 0xFEFEFEFE )
+ fileLength = *((uint64_t*)((char*)(&stat_buf)+0x30)); // HACK work around for kernel stat bug rdar://problem/3845883
+#endif
+
+ // validate it is a file (not directory)
+ if ( (stat_buf.st_mode & S_IFMT) != S_IFREG )
+ throw "not a file";
+
+ // min file is 4K
+ if ( fileLength < 4096 ) {
+ throw "file to short";
+ }
+
+ uint8_t firstPage[4096];
+ pread(fd, firstPage, 4096,0);
+
+ // if fat wrapper, find usable sub-file
+ const fat_header* fileStartAsFat = (fat_header*)firstPage;
+ if ( fileStartAsFat->magic == OSSwapBigToHostInt32(FAT_MAGIC) ) {
+ if ( fatFindBest(fileStartAsFat, &fileOffset, &fileLength) ) {
+ pread(fd, firstPage, 4096, fileOffset);
+ }
+ else {
+ throw "no matching architecture in universal wrapper";
+ }
+ }
+
+ // try mach-o loader
+ if ( isCompatibleMachO(firstPage) ) {
+ char realFilePath[PATH_MAX];
+ if ( gLinkContext.slideAndPackDylibs ) {
+ // when prebinding, we always want to track the real path of images
+ if ( realpath(path, realFilePath) != NULL )
+ path = realFilePath;
+ }
+
+ // instantiate an image
+ ImageLoader* image = new ImageLoaderMachO(path, fd, firstPage, fileOffset, fileLength, stat_buf, gLinkContext);
+
+ // now sanity check that this loaded image does not have the same install path as any existing image
+ const char* loadedImageInstallPath = image->getInstallPath();
+ if ( image->isDylib() && (loadedImageInstallPath != NULL) && (loadedImageInstallPath[0] == '/') ) {
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ ImageLoader* anImage = *it;
+ const char* installPath = anImage->getInstallPath();
+ if ( installPath != NULL) {
+ if ( strcmp(loadedImageInstallPath, installPath) == 0 ) {
+ //fprintf(stderr, "duplicate(%s) => %p\n", installPath, anImage);
+ delete image;
+ return anImage;
+ }
+ }
+ }
+ }
+
+ // some API's restrict what they can load
+ if ( context.mustBeBundle && !image->isBundle() )
+ throw "not a bundle";
+ if ( context.mustBeDylib && !image->isDylib() )
+ throw "not a dylib";
+
+ // don't add bundles to global list, they can be loaded but not linked. When linked it will be added to list
+ if ( ! image->isBundle() )
+ addImage(image);
+
+ return image;
+ }
+
+ // try other file formats...
+
+
+ // throw error about what was found
+ switch (*(uint32_t*)firstPage) {
+ case MH_MAGIC:
+ case MH_CIGAM:
+ case MH_MAGIC_64:
+ case MH_CIGAM_64:
+ throw "mach-o, but wrong architecture";
+ default:
+ throwf("unknown file type, first eight bytes: 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X",
+ firstPage[0], firstPage[1], firstPage[2], firstPage[3], firstPage[4], firstPage[5], firstPage[6],firstPage[7]);
+ }
+}
+
+
+// try to open file
+static ImageLoader* loadPhase5open(const char* path, const LoadContext& context, std::vector<const char*>* exceptions)
+{
+ //fprintf(stdout, "%s(%s)\n", __func__, path);
+ ImageLoader* image = NULL;
+
+ // open file (automagically closed when this function exits)
+ FileOpener file(path);
+
+ //fprintf(stderr, "open(%s) => %d\n", path, file.getFileDescriptor() );
+
+ if ( file.getFileDescriptor() == -1 )
+ return NULL;
+
+ struct stat stat_buf;
+#if __ppc64__
+ memset(&stat_buf, 254, sizeof(struct stat)); // hack until rdar://problem/3845883 is fixed
+#endif
+ if ( fstat(file.getFileDescriptor(), &stat_buf) == -1)
+ throw "stat error";
+
+ // in case image was renamed or found via symlinks, check for inode match
+ image = findLoadedImage(stat_buf);
+ if ( image != NULL )
+ return image;
+
+ // needed to implement NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED
+ if ( context.dontLoad )
+ return NULL;
+
+ try {
+ return loadPhase6(file.getFileDescriptor(), stat_buf, path, context);
+ }
+ catch (const char* msg) {
+ char* newMsg = new char[strlen(msg) + strlen(path) + 8];
+ sprintf(newMsg, "%s: %s", path, msg);
+ exceptions->push_back(newMsg);
+ return NULL;
+ }
+}
+
+// look for path match with existing loaded images
+static ImageLoader* loadPhase5check(const char* path, const LoadContext& context)
+{
+ //fprintf(stderr, "%s(%s)\n", __func__ , path);
+ // search path against load-path and install-path of all already loaded images
+ uint32_t hash = ImageLoader::hash(path);
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ ImageLoader* anImage = *it;
+ // check has first to cut down on strcmp calls
+ if ( anImage->getPathHash() == hash )
+ if ( strcmp(path, anImage->getPath()) == 0 ) {
+ // if we are looking for a dylib don't return something else
+ if ( !context.mustBeDylib || anImage->isDylib() )
+ return anImage;
+ }
+ if ( context.matchByInstallName || anImage->matchInstallPath() ) {
+ const char* installPath = anImage->getInstallPath();
+ if ( installPath != NULL) {
+ if ( strcmp(path, installPath) == 0 ) {
+ // if we are looking for a dylib don't return something else
+ if ( !context.mustBeDylib || anImage->isDylib() )
+ return anImage;
+ }
+ }
+ }
+ }
+
+ //fprintf(stderr, "check(%s) => NULL\n", path);
+ return NULL;
+}
+
+
+// open or check existing
+static ImageLoader* loadPhase5(const char* path, const LoadContext& context, std::vector<const char*>* exceptions)
+{
+ //fprintf(stderr, "%s(%s)\n", __func__ , path);
+ if ( exceptions != NULL )
+ return loadPhase5open(path, context, exceptions);
+ else
+ return loadPhase5check(path, context);
+}
+
+// try with and without image suffix
+static ImageLoader* loadPhase4(const char* path, const LoadContext& context, std::vector<const char*>* exceptions)
+{
+ //fprintf(stderr, "%s(%s)\n", __func__ , path);
+ ImageLoader* image = NULL;
+ if ( gLinkContext.imageSuffix != NULL ) {
+ char pathWithSuffix[strlen(path)+strlen( gLinkContext.imageSuffix)+2];
+ ImageLoader::addSuffix(path, gLinkContext.imageSuffix, pathWithSuffix);
+ image = loadPhase5(pathWithSuffix, context, exceptions);
+ }
+ if ( image == NULL )
+ image = loadPhase5(path, context, exceptions);
+ return image;
+}
+
+
+// expand @ variables
+static ImageLoader* loadPhase3(const char* path, const LoadContext& context, std::vector<const char*>* exceptions)
+{
+ //fprintf(stderr, "%s(%s)\n", __func__ , path);
+ ImageLoader* image = NULL;
+ if ( strncmp(path, "@executable_path/", 17) == 0 ) {
+ // handle @executable_path path prefix
+ const char* executablePath = sExecPath;
+ char newPath[strlen(executablePath) + strlen(path)];
+ strcpy(newPath, executablePath);
+ char* addPoint = strrchr(newPath,'/');
+ if ( addPoint != NULL )
+ strcpy(&addPoint[1], &path[17]);
+ else
+ strcpy(newPath, &path[17]);
+ image = loadPhase4(newPath, context, exceptions);
+ if ( image != NULL )
+ return image;
+
+ // perhaps main executable path is a sym link, find realpath and retry
+ char resolvedPath[PATH_MAX];
+ if ( realpath(sExecPath, resolvedPath) != NULL ) {
+ char newRealPath[strlen(resolvedPath) + strlen(path)];
+ strcpy(newRealPath, resolvedPath);
+ char* addPoint = strrchr(newRealPath,'/');
+ if ( addPoint != NULL )
+ strcpy(&addPoint[1], &path[17]);
+ else
+ strcpy(newRealPath, &path[17]);
+ image = loadPhase4(newRealPath, context, exceptions);
+ if ( image != NULL )
+ return image;
+ }
+ }
+ else if ( (strncmp(path, "@loader_path/", 13) == 0) && (context.origin != NULL) ) {
+ // handle @loader_path path prefix
+ char newPath[strlen(context.origin) + strlen(path)];
+ strcpy(newPath, context.origin);
+ char* addPoint = strrchr(newPath,'/');
+ if ( addPoint != NULL )
+ strcpy(&addPoint[1], &path[13]);
+ else
+ strcpy(newPath, &path[13]);
+ image = loadPhase4(newPath, context, exceptions);
+ if ( image != NULL )
+ return image;
+
+ // perhaps loader path is a sym link, find realpath and retry
+ char resolvedPath[PATH_MAX];
+ if ( realpath(context.origin, resolvedPath) != NULL ) {
+ char newRealPath[strlen(resolvedPath) + strlen(path)];
+ strcpy(newRealPath, resolvedPath);
+ char* addPoint = strrchr(newRealPath,'/');
+ if ( addPoint != NULL )
+ strcpy(&addPoint[1], &path[13]);
+ else
+ strcpy(newRealPath, &path[13]);
+ image = loadPhase4(newRealPath, context, exceptions);
+ if ( image != NULL )
+ return image;
+ }
+ }
+
+ return loadPhase4(path, context, exceptions);
+}
+
+
+// try search paths
+static ImageLoader* loadPhase2(const char* path, const LoadContext& context,
+ const char* const frameworkPaths[], const char* const libraryPaths[],
+ std::vector<const char*>* exceptions)
+{
+ //fprintf(stderr, "%s(%s)\n", __func__ , path);
+ ImageLoader* image = NULL;
+ const char* frameworkPartialPath = getFrameworkPartialPath(path);
+ if ( frameworkPaths != NULL ) {
+ if ( frameworkPartialPath != NULL ) {
+ const int frameworkPartialPathLen = strlen(frameworkPartialPath);
+ for(const char* const* fp = frameworkPaths; *fp != NULL; ++fp) {
+ char npath[strlen(*fp)+frameworkPartialPathLen+8];
+ strcpy(npath, *fp);
+ strcat(npath, "/");
+ strcat(npath, frameworkPartialPath);
+ //fprintf(stderr, "dyld: fallback framework path used: %s() -> loadPhase4(\"%s\", ...)\n", __func__, npath);
+ image = loadPhase4(npath, context, exceptions);
+ if ( image != NULL )
+ return image;
+ }
+ }
+ }
+ if ( libraryPaths != NULL ) {
+ const char* libraryLeafName = getLibraryLeafName(path);
+ const int libraryLeafNameLen = strlen(libraryLeafName);
+ for(const char* const* lp = libraryPaths; *lp != NULL; ++lp) {
+ char libpath[strlen(*lp)+libraryLeafNameLen+8];
+ strcpy(libpath, *lp);
+ strcat(libpath, "/");
+ strcat(libpath, libraryLeafName);
+ //fprintf(stderr, "dyld: fallback library path used: %s() -> loadPhase4(\"%s\", ...)\n", __func__, libpath);
+ image = loadPhase4(libpath, context, exceptions);
+ if ( image != NULL )
+ return image;
+ }
+ }
+ return NULL;
+}
+
+// try search overrides and fallbacks
+static ImageLoader* loadPhase1(const char* path, const LoadContext& context, std::vector<const char*>* exceptions)
+{
+ //fprintf(stderr, "%s(%s)\n", __func__ , path);
+ ImageLoader* image = NULL;
+
+ // handle LD_LIBRARY_PATH environment variables that force searching
+ if ( context.useLdLibraryPath && (sEnv.LD_LIBRARY_PATH != NULL) ) {
+ image = loadPhase2(path, context, NULL, sEnv.LD_LIBRARY_PATH, exceptions);
+ if ( image != NULL )
+ return image;
+ }
+
+ // handle DYLD_ environment variables that force searching
+ if ( context.useSearchPaths && ((sEnv.DYLD_FRAMEWORK_PATH != NULL) || (sEnv.DYLD_LIBRARY_PATH != NULL)) ) {
+ image = loadPhase2(path, context, sEnv.DYLD_FRAMEWORK_PATH, sEnv.DYLD_LIBRARY_PATH, exceptions);
+ if ( image != NULL )
+ return image;
+ }
+
+ // try raw path
+ image = loadPhase3(path, context, exceptions);
+ if ( image != NULL )
+ return image;
+
+ // try fallback paths during second time (will open file)
+ if ( (exceptions != NULL) && ((sEnv.DYLD_FALLBACK_FRAMEWORK_PATH != NULL) || (sEnv.DYLD_FALLBACK_LIBRARY_PATH != NULL)) ) {
+ image = loadPhase2(path, context, sEnv.DYLD_FALLBACK_FRAMEWORK_PATH, sEnv.DYLD_FALLBACK_LIBRARY_PATH, exceptions);
+ if ( image != NULL )
+ return image;
+ }
+
+ return NULL;
+}
+
+// try root substitutions
+static ImageLoader* loadPhase0(const char* path, const LoadContext& context, std::vector<const char*>* exceptions)
+{
+ //fprintf(stderr, "%s(%s)\n", __func__ , path);
+
+ // handle DYLD_ROOT_PATH which forces absolute paths to use a new root
+ if ( (sEnv.DYLD_ROOT_PATH != NULL) && (path[0] == '/') ) {
+ for(const char* const* rootPath = sEnv.DYLD_ROOT_PATH ; *rootPath != NULL; ++rootPath) {
+ char newPath[strlen(*rootPath) + strlen(path)+2];
+ strcpy(newPath, *rootPath);
+ strcat(newPath, path);
+ ImageLoader* image = loadPhase1(newPath, context, exceptions);
+ if ( image != NULL )
+ return image;
+ }
+ }
+
+ // try raw path
+ return loadPhase1(path, context, exceptions);
+}
+
+//
+// Given all the DYLD_ environment variables, the general case for loading libraries
+// is that any given path expands into a list of possible locations to load. We
+// also must take care to ensure two copies of the "same" library are never loaded.
+//
+// The algorithm used here is that there is a separate function for each "phase" of the
+// path expansion. Each phase function calls the next phase with each possible expansion
+// of that phase. The result is the last phase is called with all possible paths.
+//
+// To catch duplicates the algorithm is run twice. The first time, the last phase checks
+// the path against all loaded images. The second time, the last phase calls open() on
+// the path. Either time, if an image is found, the phases all unwind without checking
+// for other paths.
+//
+ImageLoader* load(const char* path, const LoadContext& context)
+{
+ //fprintf(stderr, "%s(%s)\n", __func__ , path);
+ char realPath[PATH_MAX];
+ // when DYLD_IMAGE_SUFFIX is in used, do a realpath(), otherwise a load of "Foo.framework/Foo" will not match
+ if ( context.useSearchPaths && ( gLinkContext.imageSuffix != NULL) ) {
+ if ( realpath(path, realPath) != NULL )
+ path = realPath;
+ }
+
+ // try all path permutations and check against existing loaded images
+ ImageLoader* image = loadPhase0(path, context, NULL);
+ if ( image != NULL )
+ return image;
+
+ // try all path permutations and try open() until first sucesss
+ std::vector<const char*> exceptions;
+ image = loadPhase0(path, context, &exceptions);
+ if ( image != NULL )
+ return image;
+ else if ( context.dontLoad )
+ return NULL;
+ else if ( exceptions.size() == 0 )
+ throw "image not found";
+ else {
+ const char* msgStart = "no suitable image found. Did find:";
+ const char* delim = "\n\t";
+ size_t allsizes = strlen(msgStart)+8;
+ for (unsigned int i=0; i < exceptions.size(); ++i)
+ allsizes += (strlen(exceptions[i]) + strlen(delim));
+ char* fullMsg = new char[allsizes];
+ strcpy(fullMsg, msgStart);
+ for (unsigned int i=0; i < exceptions.size(); ++i) {
+ strcat(fullMsg, delim);
+ strcat(fullMsg, exceptions[i]);
+ }
+ throw (const char*)fullMsg;
+ }
+}
+
+
+
+
+// create when NSLinkModule is called for a second time on a bundle
+ImageLoader* cloneImage(ImageLoader* image)
+{
+ const uint64_t offsetInFat = image->getOffsetInFatFile();
+
+ // open file (automagically closed when this function exits)
+ FileOpener file(image->getPath());
+
+ struct stat stat_buf;
+#if __ppc64__
+ memset(&stat_buf, 254, sizeof(struct stat)); // hack until rdar://problem/3845883 is fixed
+#endif
+ if ( fstat(file.getFileDescriptor(), &stat_buf) == -1)
+ throw "stat error";
+
+ // read first page of file
+ uint8_t firstPage[4096];
+ pread(file.getFileDescriptor(), firstPage, 4096, offsetInFat);
+
+ // fat length is only used for sanity checking, since this image was already loaded once, just use upper bound
+ uint64_t lenInFat = stat_buf.st_size - offsetInFat;
+
+ // try mach-o loader
+ if ( isCompatibleMachO(firstPage) ) {
+ ImageLoader* clone = new ImageLoaderMachO(image->getPath(), file.getFileDescriptor(), firstPage, offsetInFat, lenInFat, stat_buf, gLinkContext);
+ // don't add bundles to global list, they can be loaded but not linked. When linked it will be added to list
+ if ( ! image->isBundle() )
+ addImage(clone);
+ return clone;
+ }
+
+ // try other file formats...
+ throw "can't clone image";
+}
+
+
+ImageLoader* loadFromMemory(const uint8_t* mem, uint64_t len, const char* moduleName)
+{
+ // if fat wrapper, find usable sub-file
+ const fat_header* memStartAsFat = (fat_header*)mem;
+ uint64_t fileOffset = 0;
+ uint64_t fileLength = len;
+ if ( memStartAsFat->magic == OSSwapBigToHostInt32(FAT_MAGIC) ) {
+ if ( fatFindBest(memStartAsFat, &fileOffset, &fileLength) ) {
+ mem = &mem[fileOffset];
+ len = fileLength;
+ }
+ else {
+ throw "no matching architecture in universal wrapper";
+ }
+ }
+
+ // try mach-o each loader
+ if ( isCompatibleMachO(mem) ) {
+ ImageLoader* image = new ImageLoaderMachO(moduleName, (mach_header*)mem, len, gLinkContext);
+ // don't add bundles to global list, they can be loaded but not linked. When linked it will be added to list
+ if ( ! image->isBundle() )
+ addImage(image);
+ return image;
+ }
+
+ // try other file formats...
+
+ // throw error about what was found
+ switch (*(uint32_t*)mem) {
+ case MH_MAGIC:
+ case MH_CIGAM:
+ case MH_MAGIC_64:
+ case MH_CIGAM_64:
+ throw "mach-o, but wrong architecture";
+ default:
+ throwf("unknown file type, first eight bytes: 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X",
+ mem[0], mem[1], mem[2], mem[3], mem[4], mem[5], mem[6],mem[7]);
+ }
+}
+
+
+void registerAddCallback(ImageCallback func)
+{
+ // now add to list to get notified when any more images are added
+ sAddImageCallbacks.push_back(func);
+
+ // call callback with all existing images, starting at roots
+ const int rootCount = sImageRoots.size();
+ for(int i=0; i < rootCount; ++i) {
+ ImageLoader* image = sImageRoots[i];
+ image->runNotification(gLinkContext, sAddImageCallbacks.size());
+ }
+
+// for (std::vector<ImageLoader*>::iterator it=sImageRoots.begin(); it != sImageRoots.end(); it++) {
+// ImageLoader* image = *it;
+// image->runNotification(gLinkContext, sAddImageCallbacks.size());
+// }
+}
+
+void registerRemoveCallback(ImageCallback func)
+{
+ sRemoveImageCallbacks.push_back(func);
+}
+
+void clearErrorMessage()
+{
+ error_string[0] = '\0';
+}
+
+void setErrorMessage(const char* message)
+{
+ // save off error message in global buffer for CrashReporter to find
+ strncpy(error_string, message, sizeof(error_string)-1);
+ error_string[sizeof(error_string)-1] = '\0';
+}
+
+const char* getErrorMessage()
+{
+ return error_string;
+}
+
+void halt(const char* message)
+{
+ fprintf(stderr, "dyld: %s\n", message);
+ setErrorMessage(message);
+ strncpy(error_string, message, sizeof(error_string)-1);
+ error_string[sizeof(error_string)-1] = '\0';
+
+#if __ppc__ || __ppc64__
+ __asm__ ("trap");
+#elif __i386__
+ __asm__ ("int3");
+#else
+ #error unknown architecture
+#endif
+ abort(); // needed to suppress warning that noreturn function returns
+}
+
+
+uintptr_t bindLazySymbol(const mach_header* mh, uintptr_t* lazyPointer)
+{
+ uintptr_t result = 0;
+ // acquire read-lock on dyld's data structures
+#if 0 // rdar://problem/3811777 turn off locking until deadlock is resolved
+ if ( gThreadHelpers != NULL )
+ (*gThreadHelpers->lockForReading)();
+#endif
+ // lookup and bind lazy pointer and get target address
+ try {
+ ImageLoader* target;
+ #if __i386__
+ // fast stubs pass NULL for mh and image is instead found via the location of stub (aka lazyPointer)
+ if ( mh == NULL )
+ target = dyld::findImageContainingAddressThreadSafe(lazyPointer);
+ else
+ target = dyld::findImageByMachHeader(mh);
+ #else
+ // note, target should always be mach-o, because only mach-o lazy handler wired up to this
+ target = dyld::findImageByMachHeader(mh);
+ #endif
+ if ( target == NULL )
+ throw "image not found for lazy pointer";
+ result = target->doBindLazySymbol(lazyPointer, gLinkContext);
+ }
+ catch (const char* message) {
+ fprintf(stderr, "dyld: lazy symbol binding failed: %s\n", message);
+ halt(message);
+ }
+ // release read-lock on dyld's data structures
+#if 0
+ if ( gThreadHelpers != NULL )
+ (*gThreadHelpers->unlockForReading)();
+#endif
+ // return target address to glue which jumps to it with real parameters restored
+ return result;
+}
+
+
+// SPI used by ZeroLink to lazy load bundles
+void registerZeroLinkHandlers(BundleNotificationCallBack notify, BundleLocatorCallBack locate)
+{
+ sBundleNotifier = notify;
+ sBundleLocation = locate;
+}
+
+void registerUndefinedHandler(UndefinedHandler handler)
+{
+ sUndefinedHandler = handler;
+}
+
+static void undefinedHandler(const char* symboName)
+{
+ if ( sUndefinedHandler != NULL ) {
+ (*sUndefinedHandler)(symboName);
+ }
+}
+
+static bool findExportedSymbol(const char* name, bool onlyInCoalesced, const ImageLoader::Symbol** sym, ImageLoader** image)
+{
+ // try ZeroLink short cut to finding bundle which exports this symbol
+ if ( sBundleLocation != NULL ) {
+ ImageLoader* zlImage = (*sBundleLocation)(name);
+ if ( zlImage == ((ImageLoader*)(-1)) ) {
+ // -1 is magic value that request symbol is in a bundle not yet linked into process
+ // try calling handler to link in that symbol
+ undefinedHandler(name);
+ // call locator again
+ zlImage = (*sBundleLocation)(name);
+ }
+ // if still not found, then ZeroLink has no idea where to find it
+ if ( zlImage == ((ImageLoader*)(-1)) )
+ return false;
+ if ( zlImage != NULL ) {
+ // ZeroLink cache knows where the symbol is
+ *sym = zlImage->findExportedSymbol(name, NULL, false, image);
+ if ( *sym != NULL ) {
+ *image = zlImage;
+ return true;
+ }
+ }
+ else {
+ // ZeroLink says it is in some bundle already loaded, but not linked, walk them all
+ const unsigned int imageCount = sAllImages.size();
+ for(unsigned int i=0; i < imageCount; ++i){
+ ImageLoader* anImage = sAllImages[i];
+ if ( anImage->isBundle() && !anImage->hasHiddenExports() ) {
+ //fprintf(stderr, "dyld: search for %s in %s\n", name, anImage->getPath());
+ *sym = anImage->findExportedSymbol(name, NULL, false, image);
+ if ( *sym != NULL ) {
+ return true;
+ }
+ }
+ }
+ }
+ }
+
+ // search all images in order
+ ImageLoader* firstWeakImage = NULL;
+ const ImageLoader::Symbol* firstWeakSym = NULL;
+ const unsigned int imageCount = sAllImages.size();
+ for(unsigned int i=0; i < imageCount; ++i){
+ ImageLoader* anImage = sAllImages[i];
+ if ( ! anImage->hasHiddenExports() && (!onlyInCoalesced || anImage->hasCoalescedExports()) ) {
+ *sym = anImage->findExportedSymbol(name, NULL, false, image);
+ if ( *sym != NULL ) {
+ // if weak definition found, record first one found
+ if ( ((*image)->getExportedSymbolInfo(*sym) & ImageLoader::kWeakDefinition) != 0 ) {
+ if ( firstWeakImage == NULL ) {
+ firstWeakImage = *image;
+ firstWeakSym = *sym;
+ }
+ }
+ else {
+ // found non-weak, so immediately return with it
+ return true;
+ }
+ }
+ }
+ }
+ if ( firstWeakSym != NULL ) {
+ // found a weak definition, but no non-weak, so return first weak found
+ *sym = firstWeakSym;
+ *image = firstWeakImage;
+ return true;
+ }
+
+ return false;
+}
+
+bool flatFindExportedSymbol(const char* name, const ImageLoader::Symbol** sym, ImageLoader** image)
+{
+ return findExportedSymbol(name, false, sym, image);
+}
+
+bool findCoalescedExportedSymbol(const char* name, const ImageLoader::Symbol** sym, ImageLoader** image)
+{
+ return findExportedSymbol(name, true, sym, image);
+}
+
+
+bool flatFindExportedSymbolWithHint(const char* name, const char* librarySubstring, const ImageLoader::Symbol** sym, ImageLoader** image)
+{
+ // search all images in order
+ const unsigned int imageCount = sAllImages.size();
+ for(unsigned int i=0; i < imageCount; ++i){
+ ImageLoader* anImage = sAllImages[i];
+ // only look at images whose paths contain the hint string (NULL hint string is wildcard)
+ if ( ! anImage->isBundle() && ((librarySubstring==NULL) || (strstr(anImage->getPath(), librarySubstring) != NULL)) ) {
+ *sym = anImage->findExportedSymbol(name, NULL, false, image);
+ if ( *sym != NULL ) {
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+static void getMappedRegions(ImageLoader::RegionsVector& regions)
+{
+ const unsigned int imageCount = sAllImages.size();
+ for(unsigned int i=0; i < imageCount; ++i){
+ ImageLoader* anImage = sAllImages[i];
+ anImage->addMappedRegions(regions);
+ }
+}
+
+
+static ImageLoader* libraryLocator(const char* libraryName, bool search, const char* origin, const char* rpath[])
+{
+ dyld::LoadContext context;
+ context.useSearchPaths = search;
+ context.useLdLibraryPath = false;
+ context.dontLoad = false;
+ context.mustBeBundle = false;
+ context.mustBeDylib = true;
+ context.matchByInstallName = false;
+ context.origin = origin;
+ context.rpath = rpath;
+ return load(libraryName, context);
+}
+
+
+static void setContext(int argc, const char* argv[], const char* envp[], const char* apple[])
+{
+ gLinkContext.loadLibrary = &libraryLocator;
+ gLinkContext.imageNotification = &imageNotification;
+ gLinkContext.terminationRecorder = &terminationRecorder;
+ gLinkContext.flatExportFinder = &flatFindExportedSymbol;
+ gLinkContext.coalescedExportFinder = &findCoalescedExportedSymbol;
+ gLinkContext.undefinedHandler = &undefinedHandler;
+ gLinkContext.addImageNeedingNotification = &addImageNeedingNotification;
+ gLinkContext.notifyAdding = ¬ifyAdding;
+ gLinkContext.getAllMappedRegions = &getMappedRegions;
+ gLinkContext.bindingHandler = NULL;
+ gLinkContext.bindingOptions = ImageLoader::kBindingNone;
+ gLinkContext.mainExecutable = sMainExecutable;
+ gLinkContext.argc = argc;
+ gLinkContext.argv = argv;
+ gLinkContext.envp = envp;
+ gLinkContext.apple = apple;
+}
+
+static bool checkEmulation()
+{
+#if __i386__
+ int mib[] = { CTL_KERN, KERN_CLASSIC, getpid() };
+ int is_classic = 0;
+ size_t len = sizeof(int);
+ int ret = sysctl(mib, 3, &is_classic, &len, NULL, 0);
+ if ((ret != -1) && is_classic) {
+ // When a 32-bit ppc program is run under emulation on an Intel processor,
+ // we want any i386 dylibs (e.g. the emulator) to not load in the shared region
+ // because the shared region is being used by ppc dylibs
+ gLinkContext.sharedRegionMode = ImageLoader::kDontUseSharedRegion;
+ return true;
+ }
+#endif
+ return false;
+}
+
+void link(ImageLoader* image, ImageLoader::BindingLaziness bindness, ImageLoader::InitializerRunning runInitializers)
+{
+ // add to list of known images. This did not happen at creation time for bundles
+ if ( image->isBundle() )
+ addImage(image);
+
+ // we detect root images as those not linked in yet
+ if ( !image->isLinked() )
+ addRootImage(image);
+
+ // notify ZeroLink of new image with concat of logical and physical name
+ if ( sBundleNotifier != NULL && image->isBundle() ) {
+ const int logicalLen = strlen(image->getLogicalPath());
+ char logAndPhys[strlen(image->getPath())+logicalLen+2];
+ strcpy(logAndPhys, image->getLogicalPath());
+ strcpy(&logAndPhys[logicalLen+1], image->getPath());
+ (*sBundleNotifier)(logAndPhys, image);
+ }
+
+ // process images
+ try {
+ image->link(gLinkContext, bindness, runInitializers, sAddImageCallbacks.size());
+ }
+ catch (const char* msg) {
+ sAllImagesMightContainUnlinkedImages = true;
+ throw msg;
+ }
+
+#if OLD_GDB_DYLD_INTERFACE
+ // notify gdb that loaded libraries have changed
+ gdb_dyld_state_changed();
+#endif
+}
+
+
+//
+// _pthread_keys is partitioned in a lower part that dyld will use; libSystem
+// will use the upper part. We set __pthread_tsd_first to 1 as the start of
+// the lower part. Libc will take #1 and c++ exceptions will take #2. There
+// is one free key=3 left.
+//
+extern "C" {
+ extern int __pthread_tsd_first;
+}
+
+
+//
+// Entry point for dyld. The kernel loads dyld and jumps to __dyld_start which
+// sets up some registers and call this function.
+//
+// Returns address of main() in target program which __dyld_start jumps to
+//
+uintptr_t
+_main(const struct mach_header* mainExecutableMH, int argc, const char* argv[], const char* envp[], const char* apple[])
+{
+ // set pthread keys to dyld range
+ __pthread_tsd_first = 1;
+
+ bool isEmulated = checkEmulation();
+ // Pickup the pointer to the exec path.
+ sExecPath = apple[0];
+ if (isEmulated) {
+ // under Rosetta
+ sExecPath = strdup(apple[0] + strlen(apple[0]) + 1);
+ }
+ if ( sExecPath[0] != '/' ) {
+ // have relative path, use cwd to make absolute
+ char cwdbuff[MAXPATHLEN];
+ if ( getcwd(cwdbuff, MAXPATHLEN) != NULL ) {
+ // maybe use static buffer to avoid calling malloc so early...
+ char* s = new char[strlen(cwdbuff) + strlen(sExecPath) + 2];
+ strcpy(s, cwdbuff);
+ strcat(s, "/");
+ strcat(s, sExecPath);
+ sExecPath = s;
+ }
+ }
+ uintptr_t result = 0;
+ sMainExecutableMachHeader = mainExecutableMH;
+ checkEnvironmentVariables(envp, isEmulated);
+ if ( sEnv.DYLD_PRINT_OPTS )
+ printOptions(argv);
+ if ( sEnv.DYLD_PRINT_ENV )
+ printEnvironmentVariables(envp);
+ getHostInfo();
+ setContext(argc, argv, envp, apple);
+ ImageLoader::BindingLaziness bindness = sEnv.DYLD_BIND_AT_LAUNCH ? ImageLoader::kLazyAndNonLazy : ImageLoader::kNonLazyOnly;
+
+ // load any inserted libraries before loading the main executable so that they are first in flat namespace
+ int insertLibrariesCount = 0;
+ if ( sEnv.DYLD_INSERT_LIBRARIES != NULL ) {
+ for (const char* const* lib = sEnv.DYLD_INSERT_LIBRARIES; *lib != NULL; ++lib) {
+ insertLibrariesCount++;
+ }
+ }
+ ImageLoader* insertedImages[insertLibrariesCount];
+ if ( insertLibrariesCount > 0 ) {
+ for (int i=0; i < insertLibrariesCount; ++i) {
+ try {
+ LoadContext context;
+ context.useSearchPaths = false;
+ context.useLdLibraryPath = false;
+ context.dontLoad = false;
+ context.mustBeBundle = false;
+ context.mustBeDylib = true;
+ context.matchByInstallName = false;
+ context.origin = NULL; // can't use @loader_path with DYLD_INSERT_LIBRARIES
+ context.rpath = NULL;
+ insertedImages[i] = load(sEnv.DYLD_INSERT_LIBRARIES[i], context);
+ }
+ catch (...) {
+ char buf[strlen(sEnv.DYLD_INSERT_LIBRARIES[i])+50];
+ sprintf(buf, "could not load inserted library: %s\n", sEnv.DYLD_INSERT_LIBRARIES[i]);
+ insertedImages[i] = NULL;
+ halt(buf);
+ }
+ }
+ }
+
+ // load and link main executable
+ try {
+ sMainExecutable = instantiateFromLoadedImage(mainExecutableMH, sExecPath);
+ gLinkContext.mainExecutable = sMainExecutable;
+ if ( sMainExecutable->forceFlat() ) {
+ gLinkContext.bindFlat = true;
+ gLinkContext.prebindUsage = ImageLoader::kUseNoPrebinding;
+ }
+ link(sMainExecutable, bindness, ImageLoader::kDontRunInitializers);
+ result = (uintptr_t)sMainExecutable->getMain();
+ }
+ catch(const char* message) {
+ halt(message);
+ }
+ catch(...) {
+ fprintf(stderr, "dyld: launch failed\n");
+ }
+
+ // Link in any inserted libraries.
+ // Do this after link main executable so any extra libraries pulled in by inserted libraries are at end of flat namespace
+ if ( insertLibrariesCount > 0 ) {
+ for (int i=0; i < insertLibrariesCount; ++i) {
+ try {
+ if ( insertedImages[i] != NULL )
+ link(insertedImages[i], bindness, ImageLoader::kDontRunInitializers);
+ }
+ catch (const char* message) {
+ char buf[strlen(sEnv.DYLD_INSERT_LIBRARIES[i])+50+strlen(message)];
+ sprintf(buf, "could not link inserted library: %s\n%s\n", sEnv.DYLD_INSERT_LIBRARIES[i], message);
+ halt(buf);
+ }
+ }
+ }
+
+ return result;
+}
+
+
+
+
+}; // namespace
+
+
+