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--- dyld/dyld-97.1/src/dyld.cpp
+++ /dev/null
@@ -1,2922 +0,0 @@
-/* -*- 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 {
- // <rdar://problem/5925940> Safe Boot should disable dyld shared cache
- // if we are in safe-boot mode and the cache was not made during this boot cycle,
- // delete the cache file and let it be regenerated
- uint32_t safeBootValue = 0;
- size_t safeBootValueSize = sizeof(safeBootValue);
- if ( (sysctlbyname("kern.safeboot", &safeBootValue, &safeBootValueSize, NULL, 0) == 0) && (safeBootValue != 0) ) {
- // user booted machine in safe-boot mode
- struct stat dyldCacheStatInfo;
- if ( ::stat(DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME ARCH_NAME, &dyldCacheStatInfo) == 0 ) {
- struct timeval bootTimeValue;
- size_t bootTimeValueSize = sizeof(bootTimeValue);
- if ( (sysctlbyname("kern.boottime", &bootTimeValue, &bootTimeValueSize, NULL, 0) == 0) && (bootTimeValue.tv_sec != 0) ) {
- // if the cache file was created before this boot, then throw it away and let it rebuild itself
- if ( dyldCacheStatInfo.st_mtime < bootTimeValue.tv_sec ) {
- ::unlink(DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME ARCH_NAME);
- gLinkContext.sharedRegionMode = ImageLoader::kDontUseSharedRegion;
- gSharedCacheNotFound = true;
- return;
- }
- }
- }
- }
- // 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
-
-
-