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+++ dyld/dyld-96.2/src/dyld.cpp
@@ -0,0 +1,2900 @@
+/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
+ *
+ * Copyright (c) 2004-2007 Apple 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 <errno.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 <mach-o/ldsyms.h>
+#include <libkern/OSByteOrder.h>
+#include <mach/mach.h>
+#include <sys/sysctl.h>
+#include <sys/mman.h>
+#include <sys/dtrace.h>
+
+#include <vector>
+#include <algorithm>
+
+#include "mach-o/dyld_gdb.h"
+
+#include "dyld.h"
+#include "ImageLoader.h"
+#include "ImageLoaderMachO.h"
+#include "dyldLibSystemInterface.h"
+#include "dyld_cache_format.h"
+
+// from _simple.h in libc
+typedef struct _SIMPLE* _SIMPLE_STRING;
+extern "C" void _simple_vdprintf(int __fd, const char *__fmt, va_list __ap);
+extern "C" void _simple_dprintf(int __fd, const char *__fmt, ...);
+extern "C" _SIMPLE_STRING _simple_salloc(void);
+extern "C" int _simple_vsprintf(_SIMPLE_STRING __b, const char *__fmt, va_list __ap);
+extern "C" void _simple_sfree(_SIMPLE_STRING __b);
+extern "C" char * _simple_string(_SIMPLE_STRING __b);
+
+
+
+// 32-bit ppc is only architecture that uses cpu-sub-types
+#define CPU_SUBTYPES_SUPPORTED __ppc__
+
+
+#define OLD_GDB_DYLD_INTERFACE __ppc__ || __i386__
+
+
+#define CPU_TYPE_MASK 0x00FFFFFF /* complement of CPU_ARCH_MASK */
+
+
+/* implemented in dyld_gdb.cpp */
+extern void addImagesToAllImages(uint32_t infoCount, const dyld_image_info info[]);
+extern void removeImageFromAllImages(const mach_header* mh);
+#if OLD_GDB_DYLD_INTERFACE
+extern void addImageForgdb(const mach_header* mh, uintptr_t slide, const char* physicalPath, const char* logicalPath);
+extern void removeImageForgdb(const struct mach_header* mh);
+#endif
+
+// magic so CrashReporter logs message
+extern "C" {
+ char error_string[1024];
+}
+// implemented in dyldStartup.s for CrashReporter
+extern "C" void dyld_fatal_error(const char* errString) __attribute__((noreturn));
+
+
+
+//
+// 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;
+ bool DYLD_DISABLE_DOFS;
+ // 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_DOFS ==> gLinkContext.verboseDOF
+ // 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_PRINT_WARNINGS ==> gLinkContext.verboseWarnings
+};
+
+typedef std::vector<dyld_image_state_change_handler> StateHandlers;
+struct RegisteredDOF { const mach_header* mh; int registrationID; };
+
+// 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 sMainExecutableIsSetuid = false;
+static unsigned int sInsertedDylibCount = 0;
+static std::vector<ImageLoader*> sAllImages;
+static std::vector<ImageLoader*> sImageRoots;
+static std::vector<ImageLoader*> sImageFilesNeedingTermination;
+static std::vector<RegisteredDOF> sImageFilesNeedingDOFUnregistration;
+#if IMAGE_NOTIFY_SUPPORT
+static std::vector<ImageLoader*> sImagesToNotifyAboutOtherImages;
+#endif
+static std::vector<ImageCallback> sAddImageCallbacks;
+static std::vector<ImageCallback> sRemoveImageCallbacks;
+static StateHandlers sSingleHandlers[7];
+static StateHandlers sBatchHandlers[7];
+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;
+static ImageLoader* sBundleBeingLoaded = NULL; // hack until OFI is reworked
+#if DYLD_SHARED_CACHE_SUPPORT
+static const dyld_cache_header* sSharedCache = NULL;
+bool gSharedCacheNotFound = false;
+bool gSharedCacheNeedsUpdating = false;
+bool gSharedCacheDontNotify = false;
+#endif
+ImageLoader::LinkContext gLinkContext;
+bool gLogAPIs = false;
+const struct LibSystemHelpers* gLibSystemHelpers = NULL;
+#if SUPPORT_OLD_CRT_INITIALIZATION
+bool gRunInitializersOldWay = false;
+#endif
+#if __i386__
+static uint32_t sImportSegmentsStart = 0;
+static uint32_t sImportSegmentsSize = 0;
+#endif
+
+
+
+const char* mkstringf(const char* format, ...)
+{
+ va_list list;
+ va_start(list, format);
+ _SIMPLE_STRING buf = _simple_salloc();
+ _simple_vsprintf(buf, format, list);
+ va_end(list);
+ const char* t = strdup(_simple_string(buf));
+ _simple_sfree(buf);
+ return t;
+}
+
+
+void throwf(const char* format, ...)
+{
+ va_list list;
+ va_start(list, format);
+ _SIMPLE_STRING buf = _simple_salloc();
+ _simple_vsprintf(buf, format, list);
+ va_end(list);
+ const char* t = strdup(_simple_string(buf));
+ _simple_sfree(buf);
+ throw t;
+}
+
+void log(const char* format, ...)
+{
+ va_list list;
+ va_start(list, format);
+ _simple_vdprintf(STDERR_FILENO, format, list);
+ va_end(list);
+}
+
+void warn(const char* format, ...)
+{
+ _simple_dprintf(STDERR_FILENO, "dyld: warning, ");
+ va_list list;
+ va_start(list, format);
+ _simple_vdprintf(STDERR_FILENO, format, list);
+ va_end(list);
+}
+
+
+// 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(-1)
+{
+ fd = open(path, O_RDONLY, 0);
+}
+
+FileOpener::~FileOpener()
+{
+ if ( fd != -1 )
+ close(fd);
+}
+
+
+// forward declaration
+#if __ppc__ || __i386__
+bool isRosetta();
+#endif
+
+
+static void registerDOFs(const std::vector<ImageLoader::DOFInfo>& dofs)
+{
+#if __ppc__
+ // can't dtrace a program running emulated under rosetta rdar://problem/5179640
+ if ( isRosetta() )
+ return;
+#endif
+ const unsigned int dofSectionCount = dofs.size();
+ if ( !sEnv.DYLD_DISABLE_DOFS && (dofSectionCount != 0) ) {
+ int fd = open("/dev/" DTRACEMNR_HELPER, O_RDWR);
+ if ( fd < 0 ) {
+ //dyld::warn("can't open /dev/" DTRACEMNR_HELPER " to register dtrace DOF sections\n");
+ }
+ else {
+ // allocate a buffer on the stack for the variable length dof_ioctl_data_t type
+ uint8_t buffer[sizeof(dof_ioctl_data_t) + dofSectionCount*sizeof(dof_helper_t)];
+ dof_ioctl_data_t* ioctlData = (dof_ioctl_data_t*)buffer;
+
+ // fill in buffer with one dof_helper_t per DOF section
+ ioctlData->dofiod_count = dofSectionCount;
+ for (unsigned int i=0; i < dofSectionCount; ++i) {
+ strlcpy(ioctlData->dofiod_helpers[i].dofhp_mod, dofs[i].imageShortName, DTRACE_MODNAMELEN);
+ ioctlData->dofiod_helpers[i].dofhp_dof = (uintptr_t)(dofs[i].dof);
+ ioctlData->dofiod_helpers[i].dofhp_addr = (uintptr_t)(dofs[i].dof);
+ }
+
+ // tell kernel about all DOF sections en mas
+ // pass pointer to ioctlData because ioctl() only copies a fixed size amount of data into kernel
+ user_addr_t val = (user_addr_t)(unsigned long)ioctlData;
+ if ( ioctl(fd, DTRACEHIOC_ADDDOF, &val) != -1 ) {
+ // kernel returns a unique identifier for each section in the dofiod_helpers[].dofhp_dof field.
+ for (unsigned int i=0; i < dofSectionCount; ++i) {
+ RegisteredDOF info;
+ info.mh = dofs[i].imageHeader;
+ info.registrationID = (int)(ioctlData->dofiod_helpers[i].dofhp_dof);
+ sImageFilesNeedingDOFUnregistration.push_back(info);
+ if ( gLinkContext.verboseDOF ) {
+ dyld::log("dyld: registering DOF section 0x%p in %s with dtrace, ID=0x%08X\n",
+ dofs[i].dof, dofs[i].imageShortName, info.registrationID);
+ }
+ }
+ }
+ else {
+ dyld::log( "dyld: ioctl to register dtrace DOF section failed\n");
+ }
+ close(fd);
+ }
+ }
+}
+
+static void unregisterDOF(int registrationID)
+{
+ int fd = open("/dev/" DTRACEMNR_HELPER, O_RDWR);
+ if ( fd < 0 ) {
+ dyld::warn("can't open /dev/" DTRACEMNR_HELPER " to unregister dtrace DOF section\n");
+ }
+ else {
+ ioctl(fd, DTRACEHIOC_REMOVE, registrationID);
+ close(fd);
+ if ( gLinkContext.verboseInit )
+ dyld::warn("unregistering DOF section ID=0x%08X with dtrace\n", registrationID);
+ }
+}
+
+
+//
+// _dyld_register_func_for_add_image() is implemented as part of the general image state change notification
+//
+static void notifyAddImageCallbacks(ImageLoader* image)
+{
+ // use guard so that we cannot notify about the same image twice
+ if ( ! image->addFuncNotified() ) {
+ for (std::vector<ImageCallback>::iterator it=sAddImageCallbacks.begin(); it != sAddImageCallbacks.end(); it++)
+ (*it)(image->machHeader(), image->getSlide());
+ image->setAddFuncNotified();
+ }
+}
+
+
+// notify gdb about these new images
+static const char* notifyGDB(enum dyld_image_states state, uint32_t infoCount, const struct dyld_image_info info[])
+{
+ addImagesToAllImages(infoCount, info);
+ return NULL;
+}
+
+#if IMAGE_NOTIFY_SUPPORT
+// notify objc about these new images
+static void notifyAdding(const ImageLoader* const * images, unsigned int count)
+{
+ // build array
+ if ( count != 0 ) {
+ dyld_image_info infos[count];
+ for (unsigned int i=0; i < count; ++i) {
+ dyld_image_info* p = &infos[i];
+ const ImageLoader* image = images[i];
+ p->imageLoadAddress = image->machHeader();
+ p->imageFilePath = image->getPath();
+ p->imageFileModDate = image->lastModified();
+ //dyld::log("notifying objc about %s\n", image->getPath());
+ }
+
+ // 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, count, infos);
+ }
+ }
+}
+#endif
+
+static StateHandlers* stateToHandlers(dyld_image_states state, StateHandlers handlersArray[8])
+{
+ switch ( state ) {
+ case dyld_image_state_mapped:
+ return &handlersArray[0];
+
+ case dyld_image_state_dependents_mapped:
+ return &handlersArray[1];
+
+ case dyld_image_state_rebased:
+ return &handlersArray[2];
+
+ case dyld_image_state_bound:
+ return &handlersArray[3];
+
+ case dyld_image_state_dependents_initialized:
+ return &handlersArray[4];
+
+ case dyld_image_state_initialized:
+ return &handlersArray[5];
+
+ case dyld_image_state_terminated:
+ return &handlersArray[6];
+ }
+ return NULL;
+}
+
+static void notifySingle(dyld_image_states state, const struct mach_header* mh, const char* path, time_t modDate)
+{
+ std::vector<dyld_image_state_change_handler>* handlers = stateToHandlers(state, sSingleHandlers);
+ if ( handlers != NULL ) {
+ dyld_image_info info;
+ info.imageLoadAddress = mh;
+ info.imageFilePath = path;
+ info.imageFileModDate = modDate;
+ for (std::vector<dyld_image_state_change_handler>::iterator it = handlers->begin(); it != handlers->end(); ++it) {
+ const char* result = (*it)(state, 1, &info);
+ if ( (result != NULL) && (state == dyld_image_state_mapped) ) {
+ //fprintf(stderr, " image rejected by handler=%p\n", *it);
+ // make copy of thrown string so that later catch clauses can free it
+ const char* str = strdup(result);
+ throw str;
+ }
+ }
+ }
+}
+
+
+
+static int imageSorter(const void* l, const void* r)
+{
+ const ImageLoader* left = *((ImageLoader**)l);
+ const ImageLoader* right= *((ImageLoader**)r);
+ return left->compare(right);
+}
+
+static void notifyBatchPartial(dyld_image_states state, bool orLater, dyld_image_state_change_handler onlyHandler)
+{
+ std::vector<dyld_image_state_change_handler>* handlers = stateToHandlers(state, sBatchHandlers);
+ if ( handlers != NULL ) {
+ // don't use a vector because it will use malloc/free and we want notifcation to be low cost
+ ImageLoader* images[sAllImages.size()+1];
+ ImageLoader** end = images;
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ dyld_image_states imageState = (*it)->getState();
+ if ( (imageState == state) || (orLater && (imageState > state)) )
+ *end++ = *it;
+ }
+ if ( sBundleBeingLoaded != NULL ) {
+ dyld_image_states imageState = sBundleBeingLoaded->getState();
+ if ( (imageState == state) || (orLater && (imageState > state)) )
+ *end++ = sBundleBeingLoaded;
+ }
+ unsigned int count = end-images;
+ if ( end != images ) {
+ // sort bottom up
+ qsort(images, count, sizeof(ImageLoader*), &imageSorter);
+ // build info array
+ dyld_image_info infos[count];
+ for (unsigned int i=0; i < count; ++i) {
+ dyld_image_info* p = &infos[i];
+ ImageLoader* image = images[i];
+ //dyld::log(" state=%d, name=%s\n", state, image->getPath());
+ p->imageLoadAddress = image->machHeader();
+ p->imageFilePath = image->getPath();
+ p->imageFileModDate = image->lastModified();
+ // special case for add_image hook
+ if ( state == dyld_image_state_bound )
+ notifyAddImageCallbacks(image);
+ }
+
+ if ( onlyHandler != NULL ) {
+ const char* result = (*onlyHandler)(state, count, infos);
+ if ( (result != NULL) && (state == dyld_image_state_dependents_mapped) ) {
+ //fprintf(stderr, " images rejected by handler=%p\n", onlyHandler);
+ // make copy of thrown string so that later catch clauses can free it
+ const char* str = strdup(result);
+ throw str;
+ }
+ }
+ else {
+ // call each handler with whole array
+ for (std::vector<dyld_image_state_change_handler>::iterator it = handlers->begin(); it != handlers->end(); ++it) {
+ const char* result = (*it)(state, count, infos);
+ if ( (result != NULL) && (state == dyld_image_state_dependents_mapped) ) {
+ //fprintf(stderr, " images rejected by handler=%p\n", *it);
+ // make copy of thrown string so that later catch clauses can free it
+ const char* str = strdup(result);
+ throw str;
+ }
+ }
+ }
+ }
+ }
+}
+
+static void notifyBatch(dyld_image_states state)
+{
+ notifyBatchPartial(state, false, NULL);
+}
+
+// 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)
+{
+ //dyld::log("addRootImage(%p, %s)\n", image, image->getPath());
+ // add to list of roots
+ sImageRoots.push_back(image);
+}
+
+#if IMAGE_NOTIFY_SUPPORT
+// 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);
+}
+#endif
+
+static void clearAllDepths()
+{
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++)
+ (*it)->clearDepth();
+}
+
+static unsigned int imageCount()
+{
+ return sAllImages.size();
+}
+
+static void notifySharedCacheInvalid()
+{
+ gSharedCacheNeedsUpdating = true;
+}
+
+
+
+#if __i386__
+static void makeSharedCacheImportSegmentsWritable(bool writable)
+{
+ // if cache was built with read-only __IMPORT segments
+ if ( sImportSegmentsSize != 0 ) {
+ vm_prot_t prot = VM_PROT_EXECUTE | PROT_READ;
+ if ( writable )
+ prot |= VM_PROT_WRITE;
+ vm_protect(mach_task_self(), sImportSegmentsStart, sImportSegmentsSize, false, prot);
+ if ( gLinkContext.verboseMapping ) {
+ dyld::log("%18s at %p->%p altered permissions to %c%c%c\n", "", (char*)sImportSegmentsStart, (char*)sImportSegmentsStart+sImportSegmentsSize-1,
+ (prot & PROT_READ) ? 'r' : '.', (prot & PROT_WRITE) ? 'w' : '.', (prot & PROT_EXEC) ? 'x' : '.' );
+ }
+ }
+}
+#endif
+
+static void setNewProgramVars(const ProgramVars& newVars)
+{
+ // make a copy of the pointers to program variables
+ gLinkContext.programVars = newVars;
+
+ // now set each program global to their initial value
+ *gLinkContext.programVars.NXArgcPtr = gLinkContext.argc;
+ *gLinkContext.programVars.NXArgvPtr = gLinkContext.argv;
+ *gLinkContext.programVars.environPtr = gLinkContext.envp;
+ *gLinkContext.programVars.__prognamePtr = gLinkContext.progname;
+}
+
+#if SUPPORT_OLD_CRT_INITIALIZATION
+static void setRunInitialzersOldWay()
+{
+ gRunInitializersOldWay = true;
+}
+#endif
+
+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()) ) {
+ dyld::log("dyld: loaded: %s\n", image->getPath());
+ }
+
+#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;
+ }
+ }
+
+ // if has dtrace DOF section, tell dtrace it is going away, then remove from sImageFilesNeedingDOFUnregistration
+ for (std::vector<RegisteredDOF>::iterator it=sImageFilesNeedingDOFUnregistration.begin(); it != sImageFilesNeedingDOFUnregistration.end(); ) {
+ if ( it->mh == image->machHeader() ) {
+ unregisterDOF(it->registrationID);
+ sImageFilesNeedingDOFUnregistration.erase(it);
+ // don't increment iterator, the erase caused next element to be copied to where this iterator points
+ }
+ else {
+ ++it;
+ }
+ }
+
+ // tell all register add image handlers about this
+ // do this before removing image from internal data structures so that the callback can query dyld about the image
+ if ( image->getState() >= dyld_image_state_bound ) {
+ for (std::vector<ImageCallback>::iterator it=sRemoveImageCallbacks.begin(); it != sRemoveImageCallbacks.end(); it++) {
+ (*it)(image->machHeader(), image->getSlide());
+ }
+ }
+
+#if IMAGE_NOTIFY_SUPPORT
+ // 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);
+ }
+#endif
+
+ // 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 (do this after removed from master list, so there is no chance it can come back)
+ if ( sLastImageByAddressCache == image )
+ sLastImageByAddressCache = NULL;
+
+#if IMAGE_NOTIFY_SUPPORT
+ // 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;
+ }
+ }
+#endif
+
+ // 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;
+ }
+ }
+
+ // log if requested
+ if ( sEnv.DYLD_PRINT_LIBRARIES || (sEnv.DYLD_PRINT_LIBRARIES_POST_LAUNCH && (sMainExecutable!=NULL) && sMainExecutable->isLinked()) ) {
+ dyld::log("dyld: unloaded: %s\n", image->getPath());
+ }
+
+ // 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()
+{
+
+ // record that we've reached this step
+ gLinkContext.startedInitializingMainExecutable = true;
+
+#if __i386__
+ // make all __IMPORT segments in the shared cache read-only
+ // before executing any code
+ makeSharedCacheImportSegmentsWritable(false);
+#endif
+
+ // run initialzers for any inserted dylibs
+ const int rootCount = sImageRoots.size();
+ if ( rootCount > 1 ) {
+ for(int i=1; i < rootCount; ++i)
+ sImageRoots[i]->runInitializers(gLinkContext);
+ }
+
+ // run initializers for main executable and everything it brings up
+ sMainExecutable->runInitializers(gLinkContext);
+
+ // register atexit() handler to run terminators in all loaded images when this process exits
+ if ( gLibSystemHelpers != NULL )
+ (*gLibSystemHelpers->cxa_atexit)(&runTerminators, NULL, NULL);
+
+ // dump info if requested
+ if ( sEnv.DYLD_PRINT_STATISTICS )
+ ImageLoaderMachO::printStatistics(sAllImages.size());
+}
+
+bool mainExecutablePrebound()
+{
+ return sMainExecutable->usablePrebinding(gLinkContext);
+}
+
+ImageLoader* mainExecutable()
+{
+ return sMainExecutable;
+}
+
+
+void runTerminators(void* extra)
+{
+ const unsigned int imageCount = sImageFilesNeedingTermination.size();
+ for(unsigned int i=imageCount; i > 0; --i){
+ ImageLoader* image = sImageFilesNeedingTermination[i-1];
+ image->doTermination(gLinkContext);
+ notifySingle(dyld_image_state_terminated, image->machHeader(), image->getPath(), image->lastModified());
+ }
+ sImageFilesNeedingTermination.clear();
+ notifyBatch(dyld_image_state_terminated);
+}
+
+
+//
+// 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;
+}
+
+
+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);
+ int skip = 0;
+ int i;
+ for(i = 0; paths[i] != NULL; ++i) {
+ if ( strncmp(paths[i], prefix, prefixLen) == 0 )
+ ++skip;
+ else
+ paths[i-skip] = paths[i];
+ }
+ paths[i-skip] = NULL;
+}
+
+
+#if 0
+static void paths_dump(const char **paths)
+{
+// assert(paths != NULL);
+ const char **strs = paths;
+ while(*strs != NULL)
+ {
+ dyld::log("\"%s\"\n", *strs);
+ strs++;
+ }
+ return;
+}
+#endif
+
+static void printOptions(const char* argv[])
+{
+ uint32_t i = 0;
+ while ( NULL != argv[i] ) {
+ dyld::log("opt[%i] = \"%s\"\n", i, argv[i]);
+ i++;
+ }
+}
+
+static void printEnvironmentVariables(const char* envp[])
+{
+ while ( NULL != *envp ) {
+ dyld::log("%s\n", *envp);
+ envp++;
+ }
+}
+
+void processDyldEnvironmentVarible(const char* key, const char* value)
+{
+ if ( strcmp(key, "DYLD_FRAMEWORK_PATH") == 0 ) {
+ sEnv.DYLD_FRAMEWORK_PATH = parseColonList(value);
+ gSharedCacheDontNotify = true;
+ }
+ else if ( strcmp(key, "DYLD_FALLBACK_FRAMEWORK_PATH") == 0 ) {
+ sEnv.DYLD_FALLBACK_FRAMEWORK_PATH = parseColonList(value);
+ gSharedCacheDontNotify = true;
+ }
+ else if ( strcmp(key, "DYLD_LIBRARY_PATH") == 0 ) {
+ sEnv.DYLD_LIBRARY_PATH = parseColonList(value);
+ gSharedCacheDontNotify = true;
+ }
+ else if ( strcmp(key, "DYLD_FALLBACK_LIBRARY_PATH") == 0 ) {
+ sEnv.DYLD_FALLBACK_LIBRARY_PATH = parseColonList(value);
+ gSharedCacheDontNotify = true;
+ }
+ else if ( (strcmp(key, "DYLD_ROOT_PATH") == 0) || (strcmp(key, "DYLD_PATHS_ROOT") == 0) ) {
+ gSharedCacheDontNotify = true;
+ 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] != '/' ) {
+ dyld::warn("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 ) {
+ gSharedCacheDontNotify = true;
+ gLinkContext.imageSuffix = value;
+ }
+ else if ( strcmp(key, "DYLD_INSERT_LIBRARIES") == 0 ) {
+ sEnv.DYLD_INSERT_LIBRARIES = parseColonList(value);
+ gSharedCacheDontNotify = true;
+ }
+ 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_DISABLE_DOFS") == 0 ) {
+ sEnv.DYLD_DISABLE_DOFS = true;
+ }
+ else if ( strcmp(key, "DYLD_DISABLE_PREFETCH") == 0 ) {
+ gLinkContext.preFetchDisabled = 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_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_NEW_LOCAL_SHARED_REGIONS") == 0 ) {
+ // ignore, no longer relevant but some scripts still set it
+ }
+ else if ( strcmp(key, "DYLD_NO_FIX_PREBINDING") == 0 ) {
+ gSharedCacheDontNotify = true;
+ }
+ else if ( strcmp(key, "DYLD_PREBIND_DEBUG") == 0 ) {
+ gLinkContext.verbosePrebinding = true;
+ }
+ else if ( strcmp(key, "DYLD_PRINT_INITIALIZERS") == 0 ) {
+ gLinkContext.verboseInit = true;
+ }
+ else if ( strcmp(key, "DYLD_PRINT_DOFS") == 0 ) {
+ gLinkContext.verboseDOF = 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 ) {
+ gSharedCacheDontNotify = true;
+ 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 {
+ dyld::warn("unknown option to DYLD_SHARED_REGION. Valid options are: use, private, avoid\n");
+ }
+ }
+ else if ( strcmp(key, "DYLD_IGNORE_PREBINDING") == 0 ) {
+ gSharedCacheDontNotify = true;
+ 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 {
+ dyld::warn("unknown option to DYLD_IGNORE_PREBINDING. Valid options are: all, app, nonsplit\n");
+ }
+ }
+ else {
+ dyld::warn("unknown environment variable: %s\n", key);
+ }
+}
+
+
+//
+// For security, setuid programs ignore DYLD_* environment variables.
+// Additionally, the DYLD_* enviroment variables are removed
+// from the environment, so that any child processes don't see them.
+//
+static void pruneEnvironmentVariables(const char* envp[], const char*** applep)
+{
+ // setuit binaries don't trigger a cache rebuild
+ gSharedCacheDontNotify = true;
+
+ // delete all DYLD_* and LD_LIBRARY_PATH environment variables
+ int removedCount = 0;
+ const char** d = envp;
+ for(const char** s = envp; *s != NULL; s++) {
+ if ( (strncmp(*s, "DYLD_", 5) != 0) && (strncmp(*s, "LD_LIBRARY_PATH=", 16) != 0) ) {
+ *d++ = *s;
+ }
+ else {
+ ++removedCount;
+ }
+ }
+ *d++ = NULL;
+
+ // slide apple parameters
+ if ( removedCount > 0 ) {
+ *applep = d;
+ do {
+ *d = d[removedCount];
+ } while ( *d++ != NULL );
+ }
+
+ // disable framework and library fallback paths for setuid binaries rdar://problem/4589305
+ sEnv.DYLD_FALLBACK_FRAMEWORK_PATH = NULL;
+ sEnv.DYLD_FALLBACK_LIBRARY_PATH = NULL;
+}
+
+
+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];
+ 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 )
+ 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 )
+ removePathWithPrefix(paths, "$HOME");
+ else
+ paths_expand_roots(paths, "$HOME", home);
+ sEnv.DYLD_FALLBACK_LIBRARY_PATH = paths;
+ }
+}
+
+
+static void getHostInfo()
+{
+#if 1
+ 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;
+#else
+ 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";
+#endif
+}
+
+static void checkSharedRegionDisable()
+{
+ #if __ppc__ || __i386__
+ // if main executable has segments that overlap the shared region,
+ // then disable using the shared region
+ if ( sMainExecutable->overlapsWithAddressRange((void*)0x90000000, (void*)0xAFFFFFFF) ) {
+ gLinkContext.sharedRegionMode = ImageLoader::kDontUseSharedRegion;
+ if ( gLinkContext.verboseMapping )
+ dyld::warn("disabling shared region because main executable overlaps\n");
+ }
+ #endif
+}
+
+bool validImage(const 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()
+{
+ return sAllImages.size();
+}
+
+ImageLoader* getIndexedImage(unsigned int index)
+{
+ 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 )
+ dyld::log("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;
+}
+
+
+// only for architectures that use cpu-sub-types
+#if CPU_SUBTYPES_SUPPORTED
+
+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 }
+};
+
+
+
+// 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;
+ }
+ 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] == (cpu_subtype_t)OSSwapBigToHostInt32(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:
+ 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;
+ }
+ }
+ }
+ return false;
+}
+
+#endif // CPU_SUBTYPES_SUPPORTED
+
+//
+// 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)
+{
+#if CPU_SUBTYPES_SUPPORTED
+ // 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);
+#else
+ // just find first slice with matching architecture
+ 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) == sMainExecutableMachHeader->cputype) {
+ *offset = OSSwapBigToHostInt32(archs[i].offset);
+ *len = OSSwapBigToHostInt32(archs[i].size);
+ return true;
+ }
+ }
+ return false;
+#endif
+}
+
+
+
+//
+// This is used to validate if a non-fat (aka thin or raw) mach-o file can be used
+// on the current processor. //
+bool isCompatibleMachO(const uint8_t* firstPage)
+{
+#if CPU_SUBTYPES_SUPPORTED
+ // 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
+ 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 type has no ordered list of subtypes
+ switch (mh->cputype) {
+ case CPU_TYPE_POWERPC:
+ // allow _ALL to be used by any client
+ if ( mh->cpusubtype == CPU_SUBTYPE_POWERPC_ALL )
+ return true;
+ break;
+ case CPU_TYPE_POWERPC64:
+ case CPU_TYPE_I386:
+ case CPU_TYPE_X86_64:
+ // subtypes are not used or these architectures
+ return true;
+ }
+ }
+ }
+#else
+ // For architectures that don't support cpu-sub-types
+ // this just check the cpu type.
+ const mach_header* mh = (mach_header*)firstPage;
+ if ( mh->magic == sMainExecutableMachHeader->magic ) {
+ if ( mh->cputype == sMainExecutableMachHeader->cputype ) {
+ return true;
+ }
+ }
+#endif
+ 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, uintptr_t slide, const char* path)
+{
+ // try mach-o loader
+ if ( isCompatibleMachO((const uint8_t*)mh) ) {
+ ImageLoader* image = new ImageLoaderMachO(mh, slide, path, gLinkContext);
+ addImage(image);
+ return image;
+ }
+
+ throw "main executable not a known format";
+}
+
+#if DYLD_SHARED_CACHE_SUPPORT
+static ImageLoader* findSharedCacheImage(const struct stat& stat_buf, const char* path)
+{
+ if ( sSharedCache != NULL ) {
+ // walk shared cache to see if there is a cached image that matches the inode/mtime/path desired
+ const dyld_cache_image_info* const start = (dyld_cache_image_info*)((uint8_t*)sSharedCache + sSharedCache->imagesOffset);
+ const dyld_cache_image_info* const end = &start[sSharedCache->imagesCount];
+ for( const dyld_cache_image_info* p = start; p != end; ++p) {
+ // check mtime and inode first because it is fast
+ if ( ((time_t)p->modTime == stat_buf.st_mtime) && ((ino_t)p->inode == stat_buf.st_ino) ) {
+ // mod-time and inode match an image in the shared cache, now check path
+ const char* pathInCache = (char*)sSharedCache + p->pathFileOffset;
+ bool cacheHit = (strcmp(path, pathInCache) == 0);
+ if ( ! cacheHit ) {
+ // path does not match install name of dylib in cache, but inode and mtime does match
+ // perhaps path is a symlink to the cached dylib
+ struct stat pathInCacheStatBuf;
+ if ( stat(pathInCache, &pathInCacheStatBuf) != -1 )
+ cacheHit = ( (pathInCacheStatBuf.st_dev == stat_buf.st_dev) && (pathInCacheStatBuf.st_ino == stat_buf.st_ino) );
+ }
+ if ( cacheHit ) {
+ // found image in cache, instantiate an ImageLoader with it
+ return new ImageLoaderMachO((struct mach_header*)(p->address), pathInCache, stat_buf, gLinkContext);
+ }
+ }
+ }
+ }
+ return NULL;
+}
+#endif
+
+static ImageLoader* checkandAddImage(ImageLoader* image, const LoadContext& context)
+{
+ // 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 ) {
+ //dyld::log("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;
+}
+
+// map in file and instantiate an ImageLoader
+static ImageLoader* loadPhase6(int fd, struct stat& stat_buf, const char* path, const LoadContext& context)
+{
+ //dyld::log("%s(%s)\n", __func__ , path);
+ uint64_t fileOffset = 0;
+ uint64_t fileLength = stat_buf.st_size;
+
+ // validate it is a file (not directory)
+ if ( (stat_buf.st_mode & S_IFMT) != S_IFREG )
+ throw "not a file";
+
+ uint8_t firstPage[4096];
+ bool shortPage = false;
+
+ // min mach-o file is 4K
+ if ( fileLength < 4096 ) {
+ pread(fd, firstPage, fileLength, 0);
+ shortPage = true;
+ }
+ else {
+ 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) ) {
+ if ( shortPage )
+ throw "file too short";
+
+ // instantiate an image
+ ImageLoader* image = new ImageLoaderMachO(path, fd, firstPage, fileOffset, fileLength, stat_buf, gLinkContext);
+
+ // validate
+ return checkandAddImage(image, context);
+ }
+
+ // try other file formats here...
+
+
+ // 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)
+{
+ //dyld::log("%s(%s, %p)\n", __func__ , path, exceptions);
+ ImageLoader* image = NULL;
+
+ // just return NULL if file not found, but record any other errors
+ struct stat stat_buf;
+ if ( stat(path, &stat_buf) == -1 ) {
+ int err = errno;
+ if ( err != ENOENT ) {
+ exceptions->push_back(dyld::mkstringf("%s: stat() failed with errno=%d", path, err));
+ }
+ return NULL;
+ }
+
+ // in case image was renamed or found via symlinks, check for inode match
+ image = findLoadedImage(stat_buf);
+ if ( image != NULL )
+ return image;
+
+ // do nothing if not already loaded and if RTLD_NOLOAD or NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED
+ if ( context.dontLoad )
+ return NULL;
+
+#if DYLD_SHARED_CACHE_SUPPORT
+ // see if this image is in shared cache
+ image = findSharedCacheImage(stat_buf, path);
+ if ( image != NULL ) {
+ return checkandAddImage(image, context);
+ }
+#endif
+
+ // open file (automagically closed when this function exits)
+ FileOpener file(path);
+
+ // just return NULL if file not found
+ if ( file.getFileDescriptor() == -1 )
+ return NULL;
+
+ try {
+ return loadPhase6(file.getFileDescriptor(), stat_buf, path, context);
+ }
+ catch (const char* msg) {
+ const char* newMsg = dyld::mkstringf("%s: %s", path, msg);
+ exceptions->push_back(newMsg);
+ free((void*)msg);
+ return NULL;
+ }
+}
+
+// look for path match with existing loaded images
+static ImageLoader* loadPhase5check(const char* path, const LoadContext& context)
+{
+ //dyld::log("%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;
+ }
+ }
+ }
+ }
+
+ //dyld::log("%s(%s) => NULL\n", __func__, path);
+ return NULL;
+}
+
+
+// open or check existing
+static ImageLoader* loadPhase5(const char* path, const LoadContext& context, std::vector<const char*>* exceptions)
+{
+ //dyld::log("%s(%s, %p)\n", __func__ , path, exceptions);
+ 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)
+{
+ //dyld::log("%s(%s, %p)\n", __func__ , path, exceptions);
+ 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;
+}
+
+static ImageLoader* loadPhase2(const char* path, const LoadContext& context,
+ const char* const frameworkPaths[], const char* const libraryPaths[],
+ std::vector<const char*>* exceptions); // forward reference
+
+
+// expand @ variables
+static ImageLoader* loadPhase3(const char* path, const LoadContext& context, std::vector<const char*>* exceptions)
+{
+ //dyld::log("%s(%s, %p)\n", __func__ , path, exceptions);
+ ImageLoader* image = NULL;
+ if ( strncmp(path, "@executable_path/", 17) == 0 ) {
+ // executable_path cannot be in used in any binary in a setuid process rdar://problem/4589305
+ if ( sMainExecutableIsSetuid ) {
+ throwf("unsafe use of @executable_path in %s with setuid binary", context.origin);
+ }
+ // 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) ) {
+ // @loader_path cannot be used from the main executable of a setuid process rdar://problem/4589305
+ if ( sMainExecutableIsSetuid && (strcmp(context.origin, sExecPath) == 0) )
+ throwf("unsafe use of @loader_path in %s with setuid binary", context.origin);
+
+ // 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;
+ }
+ }
+ else if ( context.implicitRPath || (strncmp(path, "@rpath/", 7) == 0) ) {
+ const char* trailingPath = (strncmp(path, "@rpath/", 7) == 0) ? &path[7] : path;
+ // substitute @rpath with all -rpath paths up the load chain
+ for(const ImageLoader::RPathChain* rp=context.rpath; rp != NULL; rp=rp->next) {
+ if (rp->paths != NULL ) {
+ for(std::vector<const char*>::iterator it=rp->paths->begin(); it != rp->paths->end(); ++it) {
+ const char* anRPath = *it;
+ char newPath[strlen(anRPath) + strlen(trailingPath)+2];
+ strcpy(newPath, anRPath);
+ strcat(newPath, "/");
+ strcat(newPath, trailingPath);
+ image = loadPhase4(newPath, context, exceptions);
+ if ( image != NULL )
+ return image;
+ }
+ }
+ }
+
+ // substitute @rpath with LD_LIBRARY_PATH
+ if ( sEnv.LD_LIBRARY_PATH != NULL ) {
+ image = loadPhase2(trailingPath, context, NULL, sEnv.LD_LIBRARY_PATH, exceptions);
+ if ( image != NULL )
+ return image;
+ }
+
+ // if this is the "open" pass, don't try to open @rpath/... as a relative path
+ if ( (exceptions != NULL) && (trailingPath != path) )
+ return NULL;
+ }
+ else if ( sMainExecutableIsSetuid && (path[0] != '/') ) {
+ throwf("unsafe use of relative rpath %s in %s with setuid binary", path, context.origin);
+ }
+
+ 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)
+{
+ //dyld::log("%s(%s, %p)\n", __func__ , path, exceptions);
+ 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);
+ //dyld::log("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);
+ //dyld::log("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)
+{
+ //dyld::log("%s(%s, %p)\n", __func__ , path, exceptions);
+ 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 ( !context.dontLoad && (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)
+{
+ //dyld::log("%s(%s, %p)\n", __func__ , path, exceptions);
+
+ // 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)
+{
+ //dyld::log("%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 ( 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]);
+ free((void*)exceptions[i]);
+ }
+ throw (const char*)fullMsg;
+ }
+}
+
+
+
+
+#if DYLD_SHARED_CACHE_SUPPORT
+
+
+// hack until dyld no longer needs to run on Leopard kernels that don't have new shared region syscall
+static bool newSharedRegionSyscallAvailable()
+{
+ int shreg_version;
+ size_t buffer_size = sizeof(shreg_version);
+ if ( sysctlbyname("vm.shared_region_version", &shreg_version, &buffer_size, NULL, 0) == 0 ) {
+ if ( shreg_version == 3 )
+ return true;
+ }
+ return false;
+}
+
+
+static int __attribute__((noinline)) _shared_region_check_np(uint64_t* start_address)
+{
+ if ( (gLinkContext.sharedRegionMode == ImageLoader::kUseSharedRegion) && newSharedRegionSyscallAvailable() )
+ return syscall(294, start_address);
+ return -1;
+}
+
+
+static int __attribute__((noinline)) _shared_region_map_np(int fd, uint32_t count, const shared_file_mapping_np mappings[])
+{
+ int result;
+ if ( (gLinkContext.sharedRegionMode == ImageLoader::kUseSharedRegion) && newSharedRegionSyscallAvailable() ) {
+ return syscall(295, fd, count, mappings);
+ }
+
+ // remove the shared region sub-map
+#if __ppc__ || __i386__
+ vm_address_t addr = (vm_address_t)0x90000000;
+ vm_deallocate(mach_task_self(), addr, 0x20000000);
+#elif __ppc64__ || __x86_64__
+ vm_address_t addr = (vm_address_t)0x7FFF60000000;
+ vm_deallocate(mach_task_self(), addr, 0x80000000);
+#endif
+
+ // map cache just for this process with mmap()
+ bool failed = false;
+ const shared_file_mapping_np* start = mappings;
+ const shared_file_mapping_np* end = &mappings[count];
+ for (const shared_file_mapping_np* p = start; p < end; ++p ) {
+ void* mmapAddress = (void*)(uintptr_t)(p->sfm_address);
+ size_t size = p->sfm_size;
+ int protection = 0;
+ if ( p->sfm_init_prot & VM_PROT_EXECUTE )
+ protection |= PROT_EXEC;
+ if ( p->sfm_init_prot & VM_PROT_READ )
+ protection |= PROT_READ;
+ if ( p->sfm_init_prot & VM_PROT_WRITE )
+ protection |= PROT_WRITE;
+ off_t offset = p->sfm_file_offset;
+ mmapAddress = mmap(mmapAddress, size, protection, MAP_FIXED | MAP_PRIVATE, fd, offset);
+ if ( mmap(mmapAddress, size, protection, MAP_FIXED | MAP_PRIVATE, fd, offset) != mmapAddress )
+ failed = true;
+ }
+ if ( !failed ) {
+ result = 0;
+ gLinkContext.sharedRegionMode = ImageLoader::kUsePrivateSharedRegion;
+ }
+ else {
+ result = -1;
+ gLinkContext.sharedRegionMode = ImageLoader::kDontUseSharedRegion;
+ if ( gLinkContext.verboseMapping )
+ dyld::log("dyld: shared cached cannot be mapped\n");
+ }
+
+ return result;
+}
+
+
+
+#if __ppc__
+ #define ARCH_NAME "ppc"
+ #define ARCH_NAME_ROSETTA "rosetta"
+ #define ARCH_VALUE CPU_TYPE_POWERPC
+ #define ARCH_CACHE_MAGIC "dyld_v1 ppc"
+#elif __ppc64__
+ #define ARCH_NAME "ppc64"
+ #define ARCH_VALUE CPU_TYPE_POWERPC64
+ #define ARCH_CACHE_MAGIC "dyld_v1 ppc64"
+#elif __i386__
+ #define ARCH_NAME "i386"
+ #define ARCH_VALUE CPU_TYPE_I386
+ #define ARCH_CACHE_MAGIC "dyld_v1 i386"
+#elif __x86_64__
+ #define ARCH_NAME "x86_64"
+ #define ARCH_VALUE CPU_TYPE_X86_64
+ #define ARCH_CACHE_MAGIC "dyld_v1 x86_64"
+#endif
+
+const void* imMemorySharedCacheHeader()
+{
+ return sSharedCache;
+}
+
+int openSharedCacheFile()
+{
+#if __ppc__
+ // rosetta cannot handle optimized _ppc cache, so it use _rosetta cache instead, rdar://problem/5495438
+ if ( isRosetta() )
+ return ::open(DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME ARCH_NAME_ROSETTA, O_RDONLY);
+ else
+#endif
+ return ::open(DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME ARCH_NAME, O_RDONLY);
+}
+
+static void mapSharedCache()
+{
+ uint64_t cacheBaseAddress;
+ // quick check if a cache is alreay mapped into shared region
+ if ( _shared_region_check_np(&cacheBaseAddress) == 0 ) {
+ sSharedCache = (dyld_cache_header*)cacheBaseAddress;
+ // if we don't understand the currently mapped shared cache, then ignore
+ if ( strcmp(sSharedCache->magic, ARCH_CACHE_MAGIC) != 0 ) {
+ sSharedCache = NULL;
+ if ( gLinkContext.verboseMapping )
+ dyld::log("dyld: existing shared cached in memory is not compatible\n");
+ }
+ }
+ else {
+ // map in shared cache to shared region
+ int fd = openSharedCacheFile();
+ if ( fd != -1 ) {
+ uint8_t firstPage[4096];
+ if ( ::read(fd, firstPage, 4096) == 4096 ) {
+ dyld_cache_header* header = (dyld_cache_header*)firstPage;
+ if ( strcmp(header->magic, ARCH_CACHE_MAGIC) == 0 ) {
+ const shared_file_mapping_np* mappings = (shared_file_mapping_np*)&firstPage[header->mappingOffset];
+ const shared_file_mapping_np* const end = &mappings[header->mappingCount];
+ // validate that the cache file has not been truncated
+ bool goodCache = false;
+ struct stat stat_buf;
+ if ( fstat(fd, &stat_buf) == 0 ) {
+ goodCache = true;
+ for (const shared_file_mapping_np* p = mappings; p < end; ++p) {
+ // rdar://problem/5694507 old update_dyld_shared_cache tool could make a cache file
+ // that is not page aligned, but otherwise ok.
+ if ( p->sfm_file_offset+p->sfm_size > (uint64_t)(stat_buf.st_size+4095 & (-4096)) )
+ goodCache = false;
+ }
+ }
+ if ( goodCache ) {
+ const shared_file_mapping_np* mappings = (shared_file_mapping_np*)&firstPage[header->mappingOffset];
+ if (_shared_region_map_np(fd, header->mappingCount, mappings) == 0) {
+ // sucessfully mapped cache into shared region
+ sSharedCache = (dyld_cache_header*)mappings[0].sfm_address;
+ }
+ }
+ else {
+ gSharedCacheNeedsUpdating = true;
+ dyld::log("dyld: shared cached file is corrupt: " DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME ARCH_NAME "\n");
+ }
+ }
+ else {
+ gSharedCacheNeedsUpdating = true;
+ if ( gLinkContext.verboseMapping )
+ dyld::log("dyld: shared cached file is invalid\n");
+ }
+ }
+ else {
+ gSharedCacheNeedsUpdating = true;
+ if ( gLinkContext.verboseMapping )
+ dyld::log("dyld: shared cached file cannot be read\n");
+ }
+ close(fd);
+ }
+ else {
+ gSharedCacheNotFound = true;
+ if ( gLinkContext.verboseMapping )
+ dyld::log("dyld: shared cached file cannot be opened\n");
+ }
+ }
+
+ // remember if dyld loaded at same address as when cache built
+ if ( sSharedCache != NULL ) {
+ gLinkContext.dyldLoadedAtSameAddressNeededBySharedCache = ((uintptr_t)(sSharedCache->dyldBaseAddress) == (uintptr_t)&_mh_dylinker_header);
+ }
+
+ // tell gdb where the shared cache is
+ if ( sSharedCache != NULL ) {
+ const shared_file_mapping_np* const start = (shared_file_mapping_np*)((uint8_t*)sSharedCache + sSharedCache->mappingOffset);
+ dyld_shared_cache_ranges.sharedRegionsCount = sSharedCache->mappingCount;
+ // only room to tell gdb about first four regions
+ if ( dyld_shared_cache_ranges.sharedRegionsCount > 4 )
+ dyld_shared_cache_ranges.sharedRegionsCount = 4;
+ if ( gLinkContext.verboseMapping ) {
+ if ( gLinkContext.sharedRegionMode == ImageLoader::kUseSharedRegion )
+ dyld::log("dyld: Mapping shared cache\n");
+ else if ( gLinkContext.sharedRegionMode == ImageLoader::kUsePrivateSharedRegion )
+ dyld::log("dyld: Mapping private shared cache\n");
+ }
+ const shared_file_mapping_np* const end = &start[dyld_shared_cache_ranges.sharedRegionsCount];
+ int index = 0;
+ for (const shared_file_mapping_np* p = start; p < end; ++p, ++index ) {
+ dyld_shared_cache_ranges.ranges[index].start = p->sfm_address;
+ dyld_shared_cache_ranges.ranges[index].length = p->sfm_size;
+ if ( gLinkContext.verboseMapping ) {
+ dyld::log(" 0x%08llX->0x%08llX %s%s%s init=%x, max=%x\n", p->sfm_address, p->sfm_address+p->sfm_size-1,
+ ((p->sfm_init_prot & VM_PROT_READ) ? "read " : ""),
+ ((p->sfm_init_prot & VM_PROT_WRITE) ? "write " : ""),
+ ((p->sfm_init_prot & VM_PROT_EXECUTE) ? "execute " : ""), p->sfm_init_prot, p->sfm_max_prot);
+ }
+ #if __i386__
+ // record if a non-writable and executable region is found in the R/W shared region
+ // this is the __IMPORT segments. dyld will turn write protection on and off as needed
+ if ( (p->sfm_init_prot == (VM_PROT_READ|VM_PROT_EXECUTE)) && ((p->sfm_address & 0xF0000000) == 0xA0000000) ) {
+ sImportSegmentsStart = p->sfm_address;
+ sImportSegmentsSize = p->sfm_size;
+ makeSharedCacheImportSegmentsWritable(true);
+ }
+ #endif
+ }
+
+ }
+}
+#endif // #if DYLD_SHARED_CACHE_SUPPORT
+
+
+
+// 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 ( 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 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 here...
+
+ // 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
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ ImageLoader* image = *it;
+ if ( image->getState() >= dyld_image_state_bound && image->getState() < dyld_image_state_terminated )
+ (*func)(image->machHeader(), image->getSlide());
+ }
+}
+
+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)
+{
+ dyld::log("dyld: %s\n", message);
+ setErrorMessage(message);
+ strncpy(error_string, message, sizeof(error_string)-1);
+ error_string[sizeof(error_string)-1] = '\0';
+ dyld_fatal_error(error_string);
+}
+
+
+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 ( gLibSystemHelpers != NULL )
+ (*gLibSystemHelpers->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 )
+ throwf("image not found for lazy pointer at %p", lazyPointer);
+ result = target->doBindLazySymbol(lazyPointer, gLinkContext);
+ }
+ catch (const char* message) {
+ dyld::log("dyld: lazy symbol binding failed: %s\n", message);
+ halt(message);
+ }
+ // release read-lock on dyld's data structures
+#if 0
+ if ( gLibSystemHelpers != NULL )
+ (*gLibSystemHelpers->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, const 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
+ if ( onlyInCoalesced ) {
+ // but ZeroLink does not know about coalescing weak symbols, so ignore ZeroLink's hint when onlyInCoalesced==true
+ }
+ else {
+ *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() ) {
+ //dyld::log("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
+ const 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];
+ // the use of inserted libraries alters search order
+ // so that inserted libraries are found before the main executable
+ if ( sInsertedDylibCount > 0 ) {
+ if ( i < sInsertedDylibCount )
+ anImage = sAllImages[i+1];
+ else if ( i == sInsertedDylibCount )
+ anImage = sAllImages[0];
+ }
+ 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, const ImageLoader** image)
+{
+ return findExportedSymbol(name, false, sym, image);
+}
+
+bool findCoalescedExportedSymbol(const char* name, const ImageLoader::Symbol** sym, const ImageLoader** image)
+{
+ return findExportedSymbol(name, true, sym, image);
+}
+
+
+bool flatFindExportedSymbolWithHint(const char* name, const char* librarySubstring, const ImageLoader::Symbol** sym, const 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 ImageLoader::MappedRegion* getMappedRegions(ImageLoader::MappedRegion* regions)
+{
+ ImageLoader::MappedRegion* end = regions;
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ (*it)->getMappedRegions(end);
+ }
+ return end;
+}
+
+void registerImageStateSingleChangeHandler(dyld_image_states state, dyld_image_state_change_handler handler)
+{
+ // mark the image that the handler is in as never-unload because dyld has a reference into it
+ ImageLoader* handlerImage = findImageContainingAddress((void*)handler);
+ if ( handlerImage != NULL )
+ handlerImage->setNeverUnload();
+
+ // add to list of handlers
+ std::vector<dyld_image_state_change_handler>* handlers = stateToHandlers(state, sSingleHandlers);
+ if ( handlers != NULL ) {
+ handlers->push_back(handler);
+
+ // call callback with all existing images
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ ImageLoader* image = *it;
+ dyld_image_info info;
+ info.imageLoadAddress = image->machHeader();
+ info.imageFilePath = image->getPath();
+ info.imageFileModDate = image->lastModified();
+ // should only call handler if state == image->state
+ if ( image->getState() == state )
+ (*handler)(state, 1, &info);
+ // ignore returned string, too late to do anything
+ }
+ }
+}
+
+void registerImageStateBatchChangeHandler(dyld_image_states state, dyld_image_state_change_handler handler)
+{
+ // mark the image that the handler is in as never-unload because dyld has a reference into it
+ ImageLoader* handlerImage = findImageContainingAddress((void*)handler);
+ if ( handlerImage != NULL )
+ handlerImage->setNeverUnload();
+
+ // add to list of handlers
+ std::vector<dyld_image_state_change_handler>* handlers = stateToHandlers(state, sBatchHandlers);
+ if ( handlers != NULL ) {
+ // insert at front, so that gdb handler is always last
+ handlers->insert(handlers->begin(), handler);
+
+ // call callback with all existing images
+ try {
+ notifyBatchPartial(state, true, handler);
+ }
+ catch (const char* msg) {
+ // ignore request to abort during registration
+ }
+ }
+}
+
+static ImageLoader* libraryLocator(const char* libraryName, bool search, bool findDLL, const char* origin, const ImageLoader::RPathChain* rpaths)
+{
+ dyld::LoadContext context;
+ context.useSearchPaths = search;
+ context.useLdLibraryPath = false;
+ context.implicitRPath = false;
+ context.matchByInstallName = false;
+ context.dontLoad = false;
+ context.mustBeBundle = false;
+ context.mustBeDylib = true;
+ context.findDLL = findDLL;
+ context.origin = origin;
+ context.rpath = rpaths;
+ return load(libraryName, context);
+}
+
+static const char* basename(const char* path)
+{
+ const char* last = path;
+ for (const char* s = path; *s != '\0'; s++) {
+ if (*s == '/')
+ last = s+1;
+ }
+ return last;
+}
+
+static void setContext(const struct mach_header* mainExecutableMH, int argc, const char* argv[], const char* envp[], const char* apple[])
+{
+ gLinkContext.loadLibrary = &libraryLocator;
+ gLinkContext.terminationRecorder = &terminationRecorder;
+ gLinkContext.flatExportFinder = &flatFindExportedSymbol;
+ gLinkContext.coalescedExportFinder = &findCoalescedExportedSymbol;
+ gLinkContext.undefinedHandler = &undefinedHandler;
+#if IMAGE_NOTIFY_SUPPORT
+ gLinkContext.addImageNeedingNotification = &addImageNeedingNotification;
+ gLinkContext.notifyAdding = ¬ifyAdding;
+#endif
+ gLinkContext.getAllMappedRegions = &getMappedRegions;
+ gLinkContext.bindingHandler = NULL;
+ gLinkContext.notifySingle = ¬ifySingle;
+ gLinkContext.notifyBatch = ¬ifyBatch;
+ gLinkContext.removeImage = &removeImage;
+ gLinkContext.registerDOFs = ®isterDOFs;
+ gLinkContext.clearAllDepths = &clearAllDepths;
+ gLinkContext.imageCount = &imageCount;
+ gLinkContext.notifySharedCacheInvalid= ¬ifySharedCacheInvalid;
+#if __i386__
+ gLinkContext.makeSharedCacheImportSegmentsWritable = &makeSharedCacheImportSegmentsWritable;
+#endif
+ gLinkContext.setNewProgramVars = &setNewProgramVars;
+#if SUPPORT_OLD_CRT_INITIALIZATION
+ gLinkContext.setRunInitialzersOldWay= &setRunInitialzersOldWay;
+#endif
+ gLinkContext.bindingOptions = ImageLoader::kBindingNone;
+ gLinkContext.argc = argc;
+ gLinkContext.argv = argv;
+ gLinkContext.envp = envp;
+ gLinkContext.apple = apple;
+ gLinkContext.progname = (argv[0] != NULL) ? basename(argv[0]) : "";
+ gLinkContext.programVars.mh = mainExecutableMH;
+ gLinkContext.programVars.NXArgcPtr = &gLinkContext.argc;
+ gLinkContext.programVars.NXArgvPtr = &gLinkContext.argv;
+ gLinkContext.programVars.environPtr = &gLinkContext.envp;
+ gLinkContext.programVars.__prognamePtr=&gLinkContext.progname;
+ gLinkContext.mainExecutable = NULL;
+ gLinkContext.imageSuffix = NULL;
+ gLinkContext.prebindUsage = ImageLoader::kUseAllPrebinding;
+ gLinkContext.sharedRegionMode = ImageLoader::kUseSharedRegion;
+}
+
+#if __ppc__ || __i386__
+bool isRosetta()
+{
+ 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) {
+ // we're running under Rosetta
+ return true;
+ }
+ return false;
+}
+#endif
+
+#if 0
+static void printAllImages()
+{
+ dyld::log("printAllImages()\n");
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ ImageLoader* image = *it;
+ dyld_image_states imageState = image->getState();
+ dyld::log(" state=%d, refcount=%d, name=%s\n", imageState, image->referenceCount(), image->getShortName());
+ image->printReferenceCounts();
+ }
+}
+#endif
+
+
+void link(ImageLoader* image, bool forceLazysBound, const ImageLoader::RPathChain& loaderRPaths)
+{
+ // add to list of known images. This did not happen at creation time for bundles
+ if ( image->isBundle() && !image->isLinked() )
+ 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, forceLazysBound, false, loaderRPaths);
+ }
+ catch (const char* msg) {
+ garbageCollectImages();
+ throw;
+ }
+
+#if OLD_GDB_DYLD_INTERFACE
+ // notify gdb that loaded libraries have changed
+ gdb_dyld_state_changed();
+#endif
+}
+
+
+void runInitializers(ImageLoader* image)
+{
+ // do bottom up initialization
+ image->runInitializers(gLinkContext);
+}
+
+void garbageCollectImages()
+{
+ // keep scanning list of images until entire list is scanned with no unreferenced images
+ bool mightBeUnreferencedImages = true;
+ while ( mightBeUnreferencedImages ) {
+ mightBeUnreferencedImages = false;
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ ImageLoader* image = *it;
+ if ( (image->referenceCount() == 0) && !image->neverUnload() && !image->isBeingRemoved() ) {
+ try {
+ //dyld::log("garbageCollectImages: deleting %s\n", image->getPath());
+ image->setBeingRemoved();
+ removeImage(image);
+ delete image;
+ }
+ catch (const char* msg) {
+ dyld::warn("problem deleting image: %s\n", msg);
+ }
+ mightBeUnreferencedImages = true;
+ break;
+ }
+ }
+ }
+ //printAllImages();
+}
+
+
+static void preflight_finally(ImageLoader* image)
+{
+ if ( image->isBundle() ) {
+ removeImageFromAllImages(image->machHeader());
+ delete image;
+ }
+ sBundleBeingLoaded = NULL;
+ dyld::garbageCollectImages();
+}
+
+
+void preflight(ImageLoader* image, const ImageLoader::RPathChain& loaderRPaths)
+{
+ try {
+ if ( image->isBundle() )
+ sBundleBeingLoaded = image; // hack
+ image->link(gLinkContext, false, true, loaderRPaths);
+ }
+ catch (const char* msg) {
+ preflight_finally(image);
+ throw;
+ }
+ preflight_finally(image);
+}
+
+static void loadInsertedDylib(const char* path)
+{
+ ImageLoader* image = NULL;
+ try {
+ LoadContext context;
+ context.useSearchPaths = false;
+ context.useLdLibraryPath = false;
+ context.implicitRPath = false;
+ context.matchByInstallName = false;
+ context.dontLoad = false;
+ context.mustBeBundle = false;
+ context.mustBeDylib = true;
+ context.findDLL = false;
+ context.origin = NULL; // can't use @loader_path with DYLD_INSERT_LIBRARIES
+ context.rpath = NULL;
+ image = load(path, context);
+ image->setNeverUnload();
+ }
+ catch (...) {
+ halt(dyld::mkstringf("could not load inserted library: %s\n", path));
+ }
+}
+
+//
+// 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, uintptr_t mainExecutableSlide, int argc, const char* argv[], const char* envp[], const char* apple[])
+{
+ setContext(mainExecutableMH, argc, argv, envp, apple);
+
+ // Pickup the pointer to the exec path.
+ sExecPath = apple[0];
+ bool ignoreEnvironmentVariables = false;
+#if __i386__
+ if ( isRosetta() ) {
+ // under Rosetta (x86 side)
+ // When a 32-bit ppc program is run under emulation on an Intel processor,
+ // we want any i386 dylibs (e.g. any used by Rosetta) to not load in the shared region
+ // because the shared region is being used by ppc dylibs
+ gLinkContext.sharedRegionMode = ImageLoader::kDontUseSharedRegion;
+ ignoreEnvironmentVariables = true;
+ }
+#endif
+ 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;
+ sMainExecutableIsSetuid = issetugid();
+ if ( sMainExecutableIsSetuid )
+ pruneEnvironmentVariables(envp, &apple);
+ else
+ checkEnvironmentVariables(envp, ignoreEnvironmentVariables);
+ if ( sEnv.DYLD_PRINT_OPTS )
+ printOptions(argv);
+ if ( sEnv.DYLD_PRINT_ENV )
+ printEnvironmentVariables(envp);
+ getHostInfo();
+ // install gdb notifier
+ stateToHandlers(dyld_image_state_dependents_mapped, sBatchHandlers)->push_back(notifyGDB);
+ // make initial allocations large enough that it is unlikely to need to be re-alloced
+ sAllImages.reserve(200);
+ sImageRoots.reserve(16);
+ sAddImageCallbacks.reserve(4);
+ sRemoveImageCallbacks.reserve(4);
+ sImageFilesNeedingTermination.reserve(16);
+ sImageFilesNeedingDOFUnregistration.reserve(8);
+
+ try {
+ // instantiate ImageLoader for main executable
+ sMainExecutable = instantiateFromLoadedImage(mainExecutableMH, mainExecutableSlide, sExecPath);
+ sMainExecutable->setNeverUnload();
+ gLinkContext.mainExecutable = sMainExecutable;
+ // load shared cache
+ checkSharedRegionDisable();
+ #if DYLD_SHARED_CACHE_SUPPORT
+ if ( gLinkContext.sharedRegionMode != ImageLoader::kDontUseSharedRegion )
+ mapSharedCache();
+ #endif
+ // load any inserted libraries
+ if ( sEnv.DYLD_INSERT_LIBRARIES != NULL ) {
+ for (const char* const* lib = sEnv.DYLD_INSERT_LIBRARIES; *lib != NULL; ++lib)
+ loadInsertedDylib(*lib);
+ }
+ // record count of inserted libraries so that a flat search will look at
+ // inserted libraries, then main, then others.
+ sInsertedDylibCount = sAllImages.size()-1;
+
+ // link main executable
+ gLinkContext.linkingMainExecutable = true;
+ link(sMainExecutable, sEnv.DYLD_BIND_AT_LAUNCH, ImageLoader::RPathChain(NULL, NULL));
+ gLinkContext.linkingMainExecutable = false;
+ if ( sMainExecutable->forceFlat() ) {
+ gLinkContext.bindFlat = true;
+ gLinkContext.prebindUsage = ImageLoader::kUseNoPrebinding;
+ }
+ result = (uintptr_t)sMainExecutable->getMain();
+
+ // link any inserted libraries
+ // do this after linking main executable so that any dylibs pulled in by inserted
+ // dylibs (e.g. libSystem) will not be in front of dylibs the program uses
+ if ( sInsertedDylibCount > 0 ) {
+ for(unsigned int i=0; i < sInsertedDylibCount; ++i) {
+ ImageLoader* image = sAllImages[i+1];
+ link(image, sEnv.DYLD_BIND_AT_LAUNCH, ImageLoader::RPathChain(NULL, NULL));
+ }
+ }
+
+ #if SUPPORT_OLD_CRT_INITIALIZATION
+ // Old way is to run initializers via a callback from crt1.o
+ if ( ! gRunInitializersOldWay )
+ #endif
+ initializeMainExecutable(); // run all initializers
+ }
+ catch(const char* message) {
+ halt(message);
+ }
+ catch(...) {
+ dyld::log("dyld: launch failed\n");
+ }
+
+ return result;
+}
+
+
+
+
+}; // namespace
+
+
+