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+++ dyld/dyld-239.3/src/dyld.cpp
@@ -0,0 +1,4544 @@
+/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
+ *
+ * Copyright (c) 2004-2010 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 <dirent.h>
+#include <sys/param.h>
+#include <mach/mach_time.h> // mach_absolute_time()
+#include <mach/mach_init.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/syslog.h>
+#include <sys/uio.h>
+#include <mach-o/fat.h>
+#include <mach-o/loader.h>
+#include <mach-o/ldsyms.h>
+#include <libkern/OSByteOrder.h>
+#include <libkern/OSAtomic.h>
+#include <mach/mach.h>
+#include <sys/sysctl.h>
+#include <sys/mman.h>
+#include <sys/dtrace.h>
+#include <libkern/OSAtomic.h>
+#include <Availability.h>
+#include <System/sys/codesign.h>
+#include <_simple.h>
+
+
+#ifndef CPU_SUBTYPE_ARM_V5TEJ
+ #define CPU_SUBTYPE_ARM_V5TEJ ((cpu_subtype_t) 7)
+#endif
+#ifndef CPU_SUBTYPE_ARM_XSCALE
+ #define CPU_SUBTYPE_ARM_XSCALE ((cpu_subtype_t) 8)
+#endif
+#ifndef CPU_SUBTYPE_ARM_V7
+ #define CPU_SUBTYPE_ARM_V7 ((cpu_subtype_t) 9)
+#endif
+#ifndef CPU_SUBTYPE_ARM_V7F
+ #define CPU_SUBTYPE_ARM_V7F ((cpu_subtype_t) 10)
+#endif
+#ifndef CPU_SUBTYPE_ARM_V7S
+ #define CPU_SUBTYPE_ARM_V7S ((cpu_subtype_t) 11)
+#endif
+#ifndef CPU_SUBTYPE_ARM_V7K
+ #define CPU_SUBTYPE_ARM_V7K ((cpu_subtype_t) 12)
+#endif
+#ifndef LC_DYLD_ENVIRONMENT
+ #define LC_DYLD_ENVIRONMENT 0x27
+#endif
+
+#ifndef VM_PROT_SLIDE
+ #define VM_PROT_SLIDE 0x20
+#endif
+
+#include <vector>
+#include <algorithm>
+
+#include "mach-o/dyld_gdb.h"
+
+#include "dyld.h"
+#include "ImageLoader.h"
+#include "ImageLoaderMachO.h"
+#include "dyldLibSystemInterface.h"
+#include "dyldSyscallInterface.h"
+#if DYLD_SHARED_CACHE_SUPPORT
+#include "dyld_cache_format.h"
+#endif
+#if CORESYMBOLICATION_SUPPORT
+#include "coreSymbolicationDyldSupport.hpp"
+#endif
+
+// not libc header for send() syscall interface
+extern "C" ssize_t __sendto(int, const void *, size_t, int, const struct sockaddr *, socklen_t);
+
+
+// ARM is the only architecture that use cpu-sub-types
+#define CPU_SUBTYPES_SUPPORTED __arm__
+
+
+
+#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);
+extern void setAlImageInfosHalt(const char* message, uintptr_t flags);
+extern void addNonSharedCacheImageUUID(const dyld_uuid_info& info);
+extern const char* notifyGDB(enum dyld_image_states state, uint32_t infoCount, const dyld_image_info info[]);
+
+// 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));
+
+// magic linker symbol for start of dyld binary
+extern "C" void* __dso_handle;
+
+
+//
+// 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 {
+ struct RegisteredDOF { const mach_header* mh; int registrationID; };
+ struct DylibOverride { const char* installName; const char* override; };
+}
+
+
+VECTOR_NEVER_DESTRUCTED(ImageLoader*);
+VECTOR_NEVER_DESTRUCTED(dyld::RegisteredDOF);
+VECTOR_NEVER_DESTRUCTED(dyld::ImageCallback);
+VECTOR_NEVER_DESTRUCTED(dyld::DylibOverride);
+VECTOR_NEVER_DESTRUCTED(ImageLoader::DynamicReference);
+
+VECTOR_NEVER_DESTRUCTED(dyld_image_state_change_handler);
+
+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_INSERT_LIBRARIES;
+ const char* const * LD_LIBRARY_PATH; // for unix conformance
+ const char* const * DYLD_VERSIONED_LIBRARY_PATH;
+ const char* const * DYLD_VERSIONED_FRAMEWORK_PATH;
+ 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;
+ bool DYLD_PRINT_CS_NOTIFICATIONS;
+ // DYLD_SHARED_CACHE_DONT_VALIDATE ==> sSharedCacheIgnoreInodeAndTimeStamp
+ // DYLD_SHARED_CACHE_DIR ==> sSharedCacheDir
+ // DYLD_ROOT_PATH ==> gLinkContext.rootPaths
+ // 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_WEAK_BINDINGS ==> gLinkContext.verboseWeakBind
+ // 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
+ // DYLD_PRINT_RPATHS ==> gLinkContext.verboseRPaths
+ // DYLD_PRINT_INTERPOSING ==> gLinkContext.verboseInterposing
+};
+
+
+
+typedef std::vector<dyld_image_state_change_handler> StateHandlers;
+
+
+enum RestrictedReason { restrictedNot, restrictedBySetGUid, restrictedBySegment, restrictedByEntitlements };
+
+// all global state
+static const char* sExecPath = NULL;
+static const char* sExecShortName = NULL;
+static const macho_header* sMainExecutableMachHeader = NULL;
+#if CPU_SUBTYPES_SUPPORTED
+static cpu_type_t sHostCPU;
+static cpu_subtype_t sHostCPUsubtype;
+#endif
+static ImageLoader* sMainExecutable = NULL;
+static bool sProcessIsRestricted = false;
+static RestrictedReason sRestrictedReason = restrictedNot;
+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;
+static std::vector<ImageCallback> sAddImageCallbacks;
+static std::vector<ImageCallback> sRemoveImageCallbacks;
+static void* sSingleHandlers[7][3];
+static void* sBatchHandlers[7][3];
+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 UndefinedHandler sUndefinedHandler = NULL;
+static ImageLoader* sBundleBeingLoaded = NULL; // hack until OFI is reworked
+#if DYLD_SHARED_CACHE_SUPPORT
+static const dyld_cache_header* sSharedCache = NULL;
+static long sSharedCacheSlide = 0;
+static bool sSharedCacheIgnoreInodeAndTimeStamp = false;
+#if __IPHONE_OS_VERSION_MIN_REQUIRED && DYLD_SHARED_CACHE_SUPPORT
+ bool gSharedCacheOverridden = false;
+ static const char* sSharedCacheDir = IPHONE_DYLD_SHARED_CACHE_DIR;
+ static bool sDylibsOverrideCache = false;
+#else
+ static const char* sSharedCacheDir = MACOSX_DYLD_SHARED_CACHE_DIR;
+#endif
+#endif
+ImageLoader::LinkContext gLinkContext;
+bool gLogAPIs = false;
+const struct LibSystemHelpers* gLibSystemHelpers = NULL;
+#if SUPPORT_OLD_CRT_INITIALIZATION
+bool gRunInitializersOldWay = false;
+#endif
+static std::vector<DylibOverride> sDylibOverrides;
+#if !TARGET_IPHONE_SIMULATOR
+static int sLogSocket = -1;
+#endif
+static bool sFrameworksFoundAsDylibs = false;
+
+static std::vector<ImageLoader::DynamicReference> sDynamicReferences;
+
+
+//
+// The MappedRanges structure is used for fast address->image lookups.
+// The table is only updated when the dyld lock is held, so we don't
+// need to worry about multiple writers. But readers may look at this
+// data without holding the lock. Therefore, all updates must be done
+// in an order that will never cause readers to see inconsistent data.
+// The general rule is that if the image field is non-NULL then
+// the other fields are valid.
+//
+struct MappedRanges
+{
+ enum { count=400 };
+ struct {
+ ImageLoader* image;
+ uintptr_t start;
+ uintptr_t end;
+ } array[count];
+ MappedRanges* next;
+};
+
+static MappedRanges sMappedRangesStart;
+
+void addMappedRange(ImageLoader* image, uintptr_t start, uintptr_t end)
+{
+ //dyld::log("addMappedRange(0x%lX->0x%lX) for %s\n", start, end, image->getShortName());
+ for (MappedRanges* p = &sMappedRangesStart; p != NULL; p = p->next) {
+ for (int i=0; i < MappedRanges::count; ++i) {
+ if ( p->array[i].image == NULL ) {
+ p->array[i].start = start;
+ p->array[i].end = end;
+ // add image field last with a barrier so that any reader will see consistent records
+ OSMemoryBarrier();
+ p->array[i].image = image;
+ return;
+ }
+ }
+ }
+ // table must be full, chain another
+ MappedRanges* newRanges = (MappedRanges*)malloc(sizeof(MappedRanges));
+ bzero(newRanges, sizeof(MappedRanges));
+ newRanges->array[0].start = start;
+ newRanges->array[0].end = end;
+ newRanges->array[0].image = image;
+ for (MappedRanges* p = &sMappedRangesStart; p != NULL; p = p->next) {
+ if ( p->next == NULL ) {
+ OSMemoryBarrier();
+ p->next = newRanges;
+ break;
+ }
+ }
+}
+
+void removedMappedRanges(ImageLoader* image)
+{
+ for (MappedRanges* p = &sMappedRangesStart; p != NULL; p = p->next) {
+ for (int i=0; i < MappedRanges::count; ++i) {
+ if ( p->array[i].image == image ) {
+ // clear with a barrier so that any reader will see consistent records
+ OSMemoryBarrier();
+ p->array[i].image = NULL;
+ }
+ }
+ }
+}
+
+ImageLoader* findMappedRange(uintptr_t target)
+{
+ for (MappedRanges* p = &sMappedRangesStart; p != NULL; p = p->next) {
+ for (int i=0; i < MappedRanges::count; ++i) {
+ if ( p->array[i].image != NULL ) {
+ if ( (p->array[i].start <= target) && (target < p->array[i].end) )
+ return p->array[i].image;
+ }
+ }
+ }
+ return NULL;
+}
+
+
+
+const char* mkstringf(const char* format, ...)
+{
+ _SIMPLE_STRING buf = _simple_salloc();
+ if ( buf != NULL ) {
+ va_list list;
+ va_start(list, format);
+ _simple_vsprintf(buf, format, list);
+ va_end(list);
+ const char* t = strdup(_simple_string(buf));
+ _simple_sfree(buf);
+ if ( t != NULL )
+ return t;
+ }
+ return "mkstringf, out of memory error";
+}
+
+
+void throwf(const char* format, ...)
+{
+ _SIMPLE_STRING buf = _simple_salloc();
+ if ( buf != NULL ) {
+ va_list list;
+ va_start(list, format);
+ _simple_vsprintf(buf, format, list);
+ va_end(list);
+ const char* t = strdup(_simple_string(buf));
+ _simple_sfree(buf);
+ if ( t != NULL )
+ throw t;
+ }
+ throw "throwf, out of memory error";
+}
+
+
+//#define ALTERNATIVE_LOGFILE "/dev/console"
+#if !TARGET_IPHONE_SIMULATOR
+static int sLogfile = STDERR_FILENO;
+#endif
+
+#if LOG_BINDINGS
+static int sBindingsLogfile = -1;
+static void mysprintf(char* dst, const char* format, ...)
+{
+ _SIMPLE_STRING buf = _simple_salloc();
+ if ( buf != NULL ) {
+ va_list list;
+ va_start(list, format);
+ _simple_vsprintf(buf, format, list);
+ va_end(list);
+ strcpy(dst, _simple_string(buf));
+ _simple_sfree(buf);
+ }
+ else {
+ strcpy(dst, "out of memory");
+ }
+}
+void logBindings(const char* format, ...)
+{
+ if ( sBindingsLogfile != -1 ) {
+ va_list list;
+ va_start(list, format);
+ _simple_vdprintf(sBindingsLogfile, format, list);
+ va_end(list);
+ }
+}
+#endif
+
+#if !TARGET_IPHONE_SIMULATOR
+// based on CFUtilities.c: also_do_stderr()
+static bool useSyslog()
+{
+ // Use syslog() for processes managed by launchd
+ if ( (gLibSystemHelpers != NULL) && (gLibSystemHelpers->version >= 11) ) {
+ if ( (*gLibSystemHelpers->isLaunchdOwned)() ) {
+ return true;
+ }
+ }
+
+ // If stderr is not available, use syslog()
+ struct stat sb;
+ int result = fstat(STDERR_FILENO, &sb);
+ if ( result < 0 )
+ return true; // file descriptor 2 is closed
+
+ return false;
+}
+
+
+static void socket_syslogv(int priority, const char* format, va_list list)
+{
+ // lazily create socket and connection to syslogd
+ if ( sLogSocket == -1 ) {
+ sLogSocket = ::socket(AF_UNIX, SOCK_DGRAM, 0);
+ if (sLogSocket == -1)
+ return; // cannot log
+ ::fcntl(sLogSocket, F_SETFD, 1);
+
+ struct sockaddr_un addr;
+ addr.sun_family = AF_UNIX;
+ strncpy(addr.sun_path, _PATH_LOG, sizeof(addr.sun_path));
+ if ( ::connect(sLogSocket, (struct sockaddr *)&addr, sizeof(addr)) == -1 ) {
+ ::close(sLogSocket);
+ sLogSocket = -1;
+ return;
+ }
+ }
+
+ // format message to syslogd like: "<priority>Process[pid]: message"
+ _SIMPLE_STRING buf = _simple_salloc();
+ if ( buf == NULL )
+ return;
+ if ( _simple_sprintf(buf, "<%d>%s[%d]: ", LOG_USER|LOG_NOTICE, sExecShortName, getpid()) == 0 ) {
+ if ( _simple_vsprintf(buf, format, list) == 0 ) {
+ const char* p = _simple_string(buf);
+ ::__sendto(sLogSocket, p, strlen(p), 0, NULL, 0);
+ }
+ }
+ _simple_sfree(buf);
+}
+
+void vlog(const char* format, va_list list)
+{
+ if ( useSyslog() )
+ socket_syslogv(LOG_ERR, format, list);
+ else
+ _simple_vdprintf(sLogfile, format, list);
+}
+
+void log(const char* format, ...)
+{
+ va_list list;
+ va_start(list, format);
+ vlog(format, list);
+ va_end(list);
+}
+
+
+void vwarn(const char* format, va_list list)
+{
+ _simple_dprintf(sLogfile, "dyld: warning, ");
+ _simple_vdprintf(sLogfile, format, list);
+}
+
+void warn(const char* format, ...)
+{
+ va_list list;
+ va_start(list, format);
+ vwarn(format, list);
+ va_end(list);
+}
+
+
+#endif // !TARGET_IPHONE_SIMULATOR
+
+
+// <rdar://problem/8867781> control access to sAllImages through a lock
+// because global dyld lock is not held during initialization phase of dlopen()
+static long sAllImagesLock = 0;
+
+static void allImagesLock()
+{
+ //dyld::log("allImagesLock()\n");
+ while ( ! OSAtomicCompareAndSwapPtrBarrier((void*)0, (void*)1, (void**)&sAllImagesLock) ) {
+ // spin
+ }
+}
+
+static void allImagesUnlock()
+{
+ //dyld::log("allImagesUnlock()\n");
+ while ( ! OSAtomicCompareAndSwapPtrBarrier((void*)1, (void*)0, (void**)&sAllImagesLock) ) {
+ // spin
+ }
+}
+
+
+
+
+// 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 = my_open(path, O_RDONLY, 0);
+}
+
+FileOpener::~FileOpener()
+{
+ if ( fd != -1 )
+ close(fd);
+}
+
+
+static void registerDOFs(const std::vector<ImageLoader::DOFInfo>& dofs)
+{
+ 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 %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* updateAllImages(enum dyld_image_states state, uint32_t infoCount, const struct dyld_image_info info[])
+{
+ // <rdar://problem/8812589> don't add images without paths to all-image-info-list
+ if ( info[0].imageFilePath != NULL )
+ addImagesToAllImages(infoCount, info);
+ return NULL;
+}
+
+
+static StateHandlers* stateToHandlers(dyld_image_states state, void* handlersArray[7][3])
+{
+ switch ( state ) {
+ case dyld_image_state_mapped:
+ return reinterpret_cast<StateHandlers*>(&handlersArray[0]);
+
+ case dyld_image_state_dependents_mapped:
+ return reinterpret_cast<StateHandlers*>(&handlersArray[1]);
+
+ case dyld_image_state_rebased:
+ return reinterpret_cast<StateHandlers*>(&handlersArray[2]);
+
+ case dyld_image_state_bound:
+ return reinterpret_cast<StateHandlers*>(&handlersArray[3]);
+
+ case dyld_image_state_dependents_initialized:
+ return reinterpret_cast<StateHandlers*>(&handlersArray[4]);
+
+ case dyld_image_state_initialized:
+ return reinterpret_cast<StateHandlers*>(&handlersArray[5]);
+
+ case dyld_image_state_terminated:
+ return reinterpret_cast<StateHandlers*>(&handlersArray[6]);
+ }
+ return NULL;
+}
+
+static void notifySingle(dyld_image_states state, const ImageLoader* image)
+{
+ //dyld::log("notifySingle(state=%d, image=%s)\n", state, image->getPath());
+ std::vector<dyld_image_state_change_handler>* handlers = stateToHandlers(state, sSingleHandlers);
+ if ( handlers != NULL ) {
+ dyld_image_info info;
+ info.imageLoadAddress = image->machHeader();
+ info.imageFilePath = image->getRealPath();
+ info.imageFileModDate = image->lastModified();
+ 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;
+ }
+ }
+ }
+ if ( state == dyld_image_state_mapped ) {
+ // <rdar://problem/7008875> Save load addr + UUID for images from outside the shared cache
+ if ( !image->inSharedCache() ) {
+ dyld_uuid_info info;
+ if ( image->getUUID(info.imageUUID) ) {
+ info.imageLoadAddress = image->machHeader();
+ addNonSharedCacheImageUUID(info);
+ }
+ }
+ }
+#if CORESYMBOLICATION_SUPPORT
+ // mach message csdlc about dynamically loaded images
+ if ( image->addFuncNotified() && (state == dyld_image_state_terminated) ) {
+ if ( sEnv.DYLD_PRINT_CS_NOTIFICATIONS ) {
+ dyld::log("dyld core symbolication unload notification: %p %s\n", image->machHeader(), image->getPath());
+ }
+ if ( dyld::gProcessInfo->coreSymbolicationShmPage != NULL) {
+ CSCppDyldSharedMemoryPage* connection = (CSCppDyldSharedMemoryPage*)dyld::gProcessInfo->coreSymbolicationShmPage;
+ if ( connection->is_valid_version() ) {
+ coresymbolication_unload_image(connection, image);
+ }
+ }
+ }
+#endif
+}
+
+
+
+
+//
+// Normally, dyld_all_image_infos is only updated in batches after an entire
+// graph is loaded. But if there is an error loading the initial set of
+// dylibs needed by the main executable, dyld_all_image_infos is not yet set
+// up, leading to usually brief crash logs.
+//
+// This function manually adds the images loaded so far to dyld::gProcessInfo.
+// It should only be called before terminating.
+//
+void syncAllImages()
+{
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); ++it) {
+ dyld_image_info info;
+ ImageLoader* image = *it;
+ info.imageLoadAddress = image->machHeader();
+ info.imageFilePath = image->getRealPath();
+ info.imageFileModDate = image->lastModified();
+ // add to all_image_infos if not already there
+ bool found = false;
+ int existingCount = dyld::gProcessInfo->infoArrayCount;
+ const dyld_image_info* existing = dyld::gProcessInfo->infoArray;
+ if ( existing != NULL ) {
+ for (int i=0; i < existingCount; ++i) {
+ if ( existing[i].imageLoadAddress == info.imageLoadAddress ) {
+ //dyld::log("not adding %s\n", info.imageFilePath);
+ found = true;
+ break;
+ }
+ }
+ }
+ if ( ! found ) {
+ //dyld::log("adding %s\n", info.imageFilePath);
+ addImagesToAllImages(1, &info);
+ }
+ }
+}
+
+
+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
+ allImagesLock();
+ 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;
+ }
+ const char* dontLoadReason = NULL;
+ 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->getRealPath();
+ 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
+ dontLoadReason = strdup(result);
+ }
+ }
+ 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
+ dontLoadReason = strdup(result);
+ break;
+ }
+ }
+ }
+ }
+ allImagesUnlock();
+ if ( dontLoadReason != NULL )
+ throw dontLoadReason;
+ }
+#if CORESYMBOLICATION_SUPPORT
+ if ( state == dyld_image_state_rebased ) {
+ if ( sEnv.DYLD_PRINT_CS_NOTIFICATIONS ) {
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ dyld_image_states imageState = (*it)->getState();
+ if ( (imageState == dyld_image_state_rebased) || (orLater && (imageState > dyld_image_state_rebased)) )
+ dyld::log("dyld core symbolication load notification: %p %s\n", (*it)->machHeader(), (*it)->getPath());
+ }
+ }
+ if ( dyld::gProcessInfo->coreSymbolicationShmPage != NULL) {
+ CSCppDyldSharedMemoryPage* connection = (CSCppDyldSharedMemoryPage*)dyld::gProcessInfo->coreSymbolicationShmPage;
+ if ( connection->is_valid_version() ) {
+ // This needs to be captured now
+ uint64_t load_timestamp = mach_absolute_time();
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ dyld_image_states imageState = (*it)->getState();
+ if ( (imageState == state) || (orLater && (imageState > state)) )
+ coresymbolication_load_image(connection, *it, load_timestamp);
+ }
+ }
+ }
+ }
+#endif
+}
+
+
+
+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);
+}
+
+
+static void clearAllDepths()
+{
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++)
+ (*it)->clearDepth();
+}
+
+static void printAllDepths()
+{
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++)
+ dyld::log("%03d %s\n", (*it)->getDepth(), (*it)->getShortName());
+}
+
+
+static unsigned int imageCount()
+{
+ return sAllImages.size();
+}
+
+
+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 addDynamicReference(ImageLoader* from, ImageLoader* to) {
+ // don't add dynamic reference if either are in the shared cache
+ if( from->inSharedCache() )
+ return;
+ if( to->inSharedCache() )
+ return;
+
+ // don't add dynamic reference if there already is a static one
+ if ( from->dependsOn(to) )
+ return;
+
+ // don't add if this combination already exists
+ for (std::vector<ImageLoader::DynamicReference>::iterator it=sDynamicReferences.begin(); it != sDynamicReferences.end(); ++it) {
+ if ( (it->from == from) && (it->to == to) )
+ return;
+ }
+ //dyld::log("addDynamicReference(%s, %s\n", from->getShortName(), to->getShortName());
+ ImageLoader::DynamicReference t;
+ t.from = from;
+ t.to = to;
+ sDynamicReferences.push_back(t);
+}
+
+static void addImage(ImageLoader* image)
+{
+ // add to master list
+ allImagesLock();
+ sAllImages.push_back(image);
+ allImagesUnlock();
+
+ // update mapped ranges
+ uintptr_t lastSegStart = 0;
+ uintptr_t lastSegEnd = 0;
+ for(unsigned int i=0, e=image->segmentCount(); i < e; ++i) {
+ if ( image->segUnaccessible(i) )
+ continue;
+ uintptr_t start = image->segActualLoadAddress(i);
+ uintptr_t end = image->segActualEndAddress(i);
+ if ( start == lastSegEnd ) {
+ // two segments are contiguous, just record combined segments
+ lastSegEnd = end;
+ }
+ else {
+ // non-contiguous segments, record last (if any)
+ if ( lastSegEnd != 0 )
+ addMappedRange(image, lastSegStart, lastSegEnd);
+ lastSegStart = start;
+ lastSegEnd = end;
+ }
+ }
+ if ( lastSegEnd != 0 )
+ addMappedRange(image, lastSegStart, lastSegEnd);
+
+
+ if ( sEnv.DYLD_PRINT_LIBRARIES || (sEnv.DYLD_PRINT_LIBRARIES_POST_LAUNCH && (sMainExecutable!=NULL) && sMainExecutable->isLinked()) ) {
+ dyld::log("dyld: loaded: %s\n", image->getPath());
+ }
+
+}
+
+//
+// Helper for std::remove_if
+//
+class RefUsesImage {
+public:
+ RefUsesImage(ImageLoader* image) : _image(image) {}
+ bool operator()(const ImageLoader::DynamicReference& ref) const {
+ return ( (ref.from == _image) || (ref.to == _image) );
+ }
+private:
+ ImageLoader* _image;
+};
+
+
+
+void removeImage(ImageLoader* image)
+{
+ // 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 registered remove 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());
+ }
+ }
+
+ // notify
+ notifySingle(dyld_image_state_terminated, image);
+
+ // remove from mapped images table
+ removedMappedRanges(image);
+
+ // remove from master list
+ allImagesLock();
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ if ( *it == image ) {
+ sAllImages.erase(it);
+ break;
+ }
+ }
+ allImagesUnlock();
+
+ // remove from sDynamicReferences
+ sDynamicReferences.erase(std::remove_if(sDynamicReferences.begin(), sDynamicReferences.end(), RefUsesImage(image)), sDynamicReferences.end());
+
+ // 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 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());
+}
+
+
+void runImageTerminators(ImageLoader* image)
+{
+ // if in termination list, pull it out and run terminator
+ bool mightBeMore;
+ do {
+ mightBeMore = false;
+ for (std::vector<ImageLoader*>::iterator it=sImageFilesNeedingTermination.begin(); it != sImageFilesNeedingTermination.end(); it++) {
+ if ( *it == image ) {
+ sImageFilesNeedingTermination.erase(it);
+ image->doTermination(gLinkContext);
+ mightBeMore = true;
+ break;
+ }
+ }
+ } while ( mightBeMore );
+
+ // <rdar://problem/7740779> dyld should directly call __cxa_finalize()
+ if ( (gLibSystemHelpers != NULL) && (gLibSystemHelpers->version >= 8) )
+ (*gLibSystemHelpers->cxa_finalize)(image->machHeader());
+
+}
+
+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;
+
+ // run initialzers for any inserted dylibs
+ ImageLoader::InitializerTimingList initializerTimes[sAllImages.size()];
+ const int rootCount = sImageRoots.size();
+ if ( rootCount > 1 ) {
+ for(int i=1; i < rootCount; ++i) {
+ initializerTimes[0].count = 0;
+ sImageRoots[i]->runInitializers(gLinkContext, initializerTimes[0]);
+ }
+ }
+
+ // run initializers for main executable and everything it brings up
+ initializerTimes[0].count = 0;
+ sMainExecutable->runInitializers(gLinkContext, initializerTimes[0]);
+
+ // 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(), initializerTimes[0]);
+}
+
+bool mainExecutablePrebound()
+{
+ return sMainExecutable->usablePrebinding(gLinkContext);
+}
+
+ImageLoader* mainExecutable()
+{
+ return sMainExecutable;
+}
+
+
+void runTerminators(void* extra)
+{
+ try {
+ const unsigned int imageCount = sImageFilesNeedingTermination.size();
+ for(unsigned int i=imageCount; i > 0; --i){
+ ImageLoader* image = sImageFilesNeedingTermination[i-1];
+ image->doTermination(gLinkContext);
+ }
+ sImageFilesNeedingTermination.clear();
+ notifyBatch(dyld_image_state_terminated);
+ }
+ catch (const char* msg) {
+ halt(msg);
+ }
+}
+
+
+#if SUPPORT_VERSIONED_PATHS
+
+// forward reference
+static bool getDylibVersionAndInstallname(const char* dylibPath, uint32_t* version, char* installName);
+
+
+//
+// Examines a dylib file and if its current_version is newer than the installed
+// dylib at its install_name, then add the dylib file to sDylibOverrides.
+//
+static void checkDylibOverride(const char* dylibFile)
+{
+ //dyld::log("checkDylibOverride('%s')\n", dylibFile);
+ uint32_t altVersion;
+ char sysInstallName[PATH_MAX];
+ if ( getDylibVersionAndInstallname(dylibFile, &altVersion, sysInstallName) ) {
+ //dyld::log("%s has version 0x%08X and install name %s\n", dylibFile, altVersion, sysInstallName);
+ uint32_t sysVersion;
+ if ( getDylibVersionAndInstallname(sysInstallName, &sysVersion, NULL) ) {
+ //dyld::log("%s has version 0x%08X\n", sysInstallName, sysVersion);
+ if ( altVersion > sysVersion ) {
+ //dyld::log("override found: %s -> %s\n", sysInstallName, dylibFile);
+ // see if there already is an override for this dylib
+ bool entryExists = false;
+ for (std::vector<DylibOverride>::iterator it = sDylibOverrides.begin(); it != sDylibOverrides.end(); ++it) {
+ if ( strcmp(it->installName, sysInstallName) == 0 ) {
+ entryExists = true;
+ uint32_t prevVersion;
+ if ( getDylibVersionAndInstallname(it->override, &prevVersion, NULL) ) {
+ if ( altVersion > prevVersion ) {
+ // found an even newer override
+ free((void*)(it->override));
+ char resolvedPath[PATH_MAX];
+ if ( realpath(dylibFile, resolvedPath) != NULL )
+ it->override = strdup(resolvedPath);
+ else
+ it->override = strdup(dylibFile);
+ break;
+ }
+ }
+ }
+ }
+ if ( ! entryExists ) {
+ DylibOverride entry;
+ entry.installName = strdup(sysInstallName);
+ char resolvedPath[PATH_MAX];
+ if ( realpath(dylibFile, resolvedPath) != NULL )
+ entry.override = strdup(resolvedPath);
+ else
+ entry.override = strdup(dylibFile);
+ sDylibOverrides.push_back(entry);
+ //dyld::log("added override: %s -> %s\n", entry.installName, entry.override);
+ }
+ }
+ }
+ }
+
+}
+
+static void checkDylibOverridesInDir(const char* dirPath)
+{
+ //dyld::log("checkDylibOverridesInDir('%s')\n", dirPath);
+ char dylibPath[PATH_MAX];
+ int dirPathLen = strlen(dirPath);
+ strlcpy(dylibPath, dirPath, PATH_MAX);
+ DIR* dirp = opendir(dirPath);
+ if ( dirp != NULL) {
+ dirent entry;
+ dirent* entp = NULL;
+ while ( readdir_r(dirp, &entry, &entp) == 0 ) {
+ if ( entp == NULL )
+ break;
+ if ( entp->d_type != DT_REG )
+ continue;
+ dylibPath[dirPathLen] = '/';
+ dylibPath[dirPathLen+1] = '\0';
+ if ( strlcat(dylibPath, entp->d_name, PATH_MAX) > PATH_MAX )
+ continue;
+ checkDylibOverride(dylibPath);
+ }
+ closedir(dirp);
+ }
+}
+
+
+static void checkFrameworkOverridesInDir(const char* dirPath)
+{
+ //dyld::log("checkFrameworkOverridesInDir('%s')\n", dirPath);
+ char frameworkPath[PATH_MAX];
+ int dirPathLen = strlen(dirPath);
+ strlcpy(frameworkPath, dirPath, PATH_MAX);
+ DIR* dirp = opendir(dirPath);
+ if ( dirp != NULL) {
+ dirent entry;
+ dirent* entp = NULL;
+ while ( readdir_r(dirp, &entry, &entp) == 0 ) {
+ if ( entp == NULL )
+ break;
+ if ( entp->d_type != DT_DIR )
+ continue;
+ frameworkPath[dirPathLen] = '/';
+ frameworkPath[dirPathLen+1] = '\0';
+ int dirNameLen = strlen(entp->d_name);
+ if ( dirNameLen < 11 )
+ continue;
+ if ( strcmp(&entp->d_name[dirNameLen-10], ".framework") != 0 )
+ continue;
+ if ( strlcat(frameworkPath, entp->d_name, PATH_MAX) > PATH_MAX )
+ continue;
+ if ( strlcat(frameworkPath, "/", PATH_MAX) > PATH_MAX )
+ continue;
+ if ( strlcat(frameworkPath, entp->d_name, PATH_MAX) > PATH_MAX )
+ continue;
+ frameworkPath[strlen(frameworkPath)-10] = '\0';
+ checkDylibOverride(frameworkPath);
+ }
+ closedir(dirp);
+ }
+}
+#endif // SUPPORT_VERSIONED_PATHS
+
+
+//
+// Turns a colon separated list of strings into a NULL terminated array
+// of string pointers. If mainExecutableDir param is not NULL,
+// substitutes @loader_path with main executable's dir.
+//
+static const char** parseColonList(const char* list, const char* mainExecutableDir)
+{
+ static const char* sEmptyList[] = { NULL };
+
+ if ( list[0] == '\0' )
+ return sEmptyList;
+
+ 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;
+ if ( (mainExecutableDir != NULL) && (strncmp(start, "@loader_path/", 13) == 0) ) {
+ int mainExecDirLen = strlen(mainExecutableDir);
+ char* str = new char[mainExecDirLen+len+1];
+ strcpy(str, mainExecutableDir);
+ strlcat(str, &start[13], mainExecDirLen+len+1);
+ str[mainExecDirLen+len-13] = '\0';
+ start = &s[1];
+ result[index++] = str;
+ }
+ else if ( (mainExecutableDir != NULL) && (strncmp(start, "@executable_path/", 17) == 0) ) {
+ int mainExecDirLen = strlen(mainExecutableDir);
+ char* str = new char[mainExecDirLen+len+1];
+ strcpy(str, mainExecutableDir);
+ strlcat(str, &start[17], mainExecDirLen+len+1);
+ str[mainExecDirLen+len-17] = '\0';
+ start = &s[1];
+ result[index++] = str;
+ }
+ else {
+ char* str = new char[len+1];
+ strncpy(str, start, len);
+ str[len] = '\0';
+ start = &s[1];
+ result[index++] = str;
+ }
+ }
+ }
+ int len = strlen(start);
+ if ( (mainExecutableDir != NULL) && (strncmp(start, "@loader_path/", 13) == 0) ) {
+ int mainExecDirLen = strlen(mainExecutableDir);
+ char* str = new char[mainExecDirLen+len+1];
+ strcpy(str, mainExecutableDir);
+ strlcat(str, &start[13], mainExecDirLen+len+1);
+ str[mainExecDirLen+len-13] = '\0';
+ result[index++] = str;
+ }
+ else if ( (mainExecutableDir != NULL) && (strncmp(start, "@executable_path/", 17) == 0) ) {
+ int mainExecDirLen = strlen(mainExecutableDir);
+ char* str = new char[mainExecDirLen+len+1];
+ strcpy(str, mainExecutableDir);
+ strlcat(str, &start[17], mainExecDirLen+len+1);
+ str[mainExecDirLen+len-17] = '\0';
+ result[index++] = str;
+ }
+ else {
+ char* str = new char[len+1];
+ strcpy(str, start);
+ result[index++] = str;
+ }
+ result[index] = NULL;
+
+ //dyld::log("parseColonList(%s)\n", list);
+ //for(int i=0; result[i] != NULL; ++i)
+ // dyld::log(" %s\n", result[i]);
+ return (const char**)result;
+}
+
+static void appendParsedColonList(const char* list, const char* mainExecutableDir, const char* const ** storage)
+{
+ const char** newlist = parseColonList(list, mainExecutableDir);
+ if ( *storage == NULL ) {
+ // first time, just set
+ *storage = newlist;
+ }
+ else {
+ // need to append to existing list
+ const char* const* existing = *storage;
+ int count = 0;
+ for(int i=0; existing[i] != NULL; ++i)
+ ++count;
+ for(int i=0; newlist[i] != NULL; ++i)
+ ++count;
+ const char** combinedList = new const char*[count+2];
+ int index = 0;
+ for(int i=0; existing[i] != NULL; ++i)
+ combinedList[index++] = existing[i];
+ for(int i=0; newlist[i] != NULL; ++i)
+ combinedList[index++] = newlist[i];
+ combinedList[index] = NULL;
+ // leak old arrays
+ *storage = combinedList;
+ }
+}
+
+
+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 processDyldEnvironmentVariable(const char* key, const char* value, const char* mainExecutableDir)
+{
+ if ( strcmp(key, "DYLD_FRAMEWORK_PATH") == 0 ) {
+ appendParsedColonList(value, mainExecutableDir, &sEnv.DYLD_FRAMEWORK_PATH);
+ }
+ else if ( strcmp(key, "DYLD_FALLBACK_FRAMEWORK_PATH") == 0 ) {
+ appendParsedColonList(value, mainExecutableDir, &sEnv.DYLD_FALLBACK_FRAMEWORK_PATH);
+ }
+ else if ( strcmp(key, "DYLD_LIBRARY_PATH") == 0 ) {
+ appendParsedColonList(value, mainExecutableDir, &sEnv.DYLD_LIBRARY_PATH);
+ }
+ else if ( strcmp(key, "DYLD_FALLBACK_LIBRARY_PATH") == 0 ) {
+ appendParsedColonList(value, mainExecutableDir, &sEnv.DYLD_FALLBACK_LIBRARY_PATH);
+ }
+ else if ( (strcmp(key, "DYLD_ROOT_PATH") == 0) || (strcmp(key, "DYLD_PATHS_ROOT") == 0) ) {
+ if ( strcmp(value, "/") != 0 ) {
+ gLinkContext.rootPaths = parseColonList(value, mainExecutableDir);
+ for (int i=0; gLinkContext.rootPaths[i] != NULL; ++i) {
+ if ( gLinkContext.rootPaths[i][0] != '/' ) {
+ dyld::warn("DYLD_ROOT_PATH not used because it contains a non-absolute path\n");
+ gLinkContext.rootPaths = NULL;
+ break;
+ }
+ }
+ }
+ }
+ else if ( strcmp(key, "DYLD_IMAGE_SUFFIX") == 0 ) {
+ gLinkContext.imageSuffix = value;
+ }
+ else if ( strcmp(key, "DYLD_INSERT_LIBRARIES") == 0 ) {
+ sEnv.DYLD_INSERT_LIBRARIES = parseColonList(value, NULL);
+ }
+ 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 ) {
+ }
+ 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_WEAK_BINDINGS") == 0 ) {
+ gLinkContext.verboseWeakBind = 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_PRINT_RPATHS") == 0 ) {
+ gLinkContext.verboseRPaths = true;
+ }
+ else if ( strcmp(key, "DYLD_PRINT_CS_NOTIFICATIONS") == 0 ) {
+ sEnv.DYLD_PRINT_CS_NOTIFICATIONS = true;
+ }
+ else if ( strcmp(key, "DYLD_PRINT_INTERPOSING") == 0 ) {
+ gLinkContext.verboseInterposing = true;
+ }
+ else if ( strcmp(key, "DYLD_PRINT_CODE_SIGNATURES") == 0 ) {
+ gLinkContext.verboseCodeSignatures = true;
+ }
+ else if ( strcmp(key, "DYLD_SHARED_REGION") == 0 ) {
+ if ( strcmp(value, "private") == 0 ) {
+ gLinkContext.sharedRegionMode = ImageLoader::kUsePrivateSharedRegion;
+ }
+ else if ( strcmp(value, "avoid") == 0 ) {
+ gLinkContext.sharedRegionMode = ImageLoader::kDontUseSharedRegion;
+ }
+ else if ( strcmp(value, "use") == 0 ) {
+ gLinkContext.sharedRegionMode = ImageLoader::kUseSharedRegion;
+ }
+ else if ( value[0] == '\0' ) {
+ gLinkContext.sharedRegionMode = ImageLoader::kUseSharedRegion;
+ }
+ else {
+ dyld::warn("unknown option to DYLD_SHARED_REGION. Valid options are: use, private, avoid\n");
+ }
+ }
+#if DYLD_SHARED_CACHE_SUPPORT
+ else if ( strcmp(key, "DYLD_SHARED_CACHE_DIR") == 0 ) {
+ sSharedCacheDir = value;
+ }
+ else if ( strcmp(key, "DYLD_SHARED_CACHE_DONT_VALIDATE") == 0 ) {
+ sSharedCacheIgnoreInodeAndTimeStamp = true;
+ }
+#endif
+ else if ( strcmp(key, "DYLD_IGNORE_PREBINDING") == 0 ) {
+ if ( strcmp(value, "all") == 0 ) {
+ gLinkContext.prebindUsage = ImageLoader::kUseNoPrebinding;
+ }
+ else if ( strcmp(value, "app") == 0 ) {
+ gLinkContext.prebindUsage = ImageLoader::kUseAllButAppPredbinding;
+ }
+ else if ( strcmp(value, "nonsplit") == 0 ) {
+ gLinkContext.prebindUsage = ImageLoader::kUseSplitSegPrebinding;
+ }
+ else if ( value[0] == '\0' ) {
+ gLinkContext.prebindUsage = ImageLoader::kUseSplitSegPrebinding;
+ }
+ else {
+ dyld::warn("unknown option to DYLD_IGNORE_PREBINDING. Valid options are: all, app, nonsplit\n");
+ }
+ }
+#if SUPPORT_VERSIONED_PATHS
+ else if ( strcmp(key, "DYLD_VERSIONED_LIBRARY_PATH") == 0 ) {
+ appendParsedColonList(value, mainExecutableDir, &sEnv.DYLD_VERSIONED_LIBRARY_PATH);
+ }
+ else if ( strcmp(key, "DYLD_VERSIONED_FRAMEWORK_PATH") == 0 ) {
+ appendParsedColonList(value, mainExecutableDir, &sEnv.DYLD_VERSIONED_FRAMEWORK_PATH);
+ }
+#endif
+ else {
+ dyld::warn("unknown environment variable: %s\n", key);
+ }
+}
+
+
+#if SUPPORT_LC_DYLD_ENVIRONMENT
+static void checkLoadCommandEnvironmentVariables()
+{
+ // <rdar://problem/8440934> Support augmenting dyld environment variables in load commands
+ const uint32_t cmd_count = sMainExecutableMachHeader->ncmds;
+ const struct load_command* const cmds = (struct load_command*)(((char*)sMainExecutableMachHeader)+sizeof(macho_header));
+ const struct load_command* cmd = cmds;
+ for (uint32_t i = 0; i < cmd_count; ++i) {
+ switch (cmd->cmd) {
+ case LC_DYLD_ENVIRONMENT:
+ {
+ const struct dylinker_command* envcmd = (struct dylinker_command*)cmd;
+ const char* keyEqualsValue = (char*)envcmd + envcmd->name.offset;
+ char mainExecutableDir[strlen(sExecPath)];
+ strcpy(mainExecutableDir, sExecPath);
+ char* lastSlash = strrchr(mainExecutableDir, '/');
+ if ( lastSlash != NULL)
+ lastSlash[1] = '\0';
+ // only process variables that start with DYLD_ and end in _PATH
+ if ( (strncmp(keyEqualsValue, "DYLD_", 5) == 0) ) {
+ const char* equals = strchr(keyEqualsValue, '=');
+ if ( equals != NULL ) {
+ if ( strncmp(&equals[-5], "_PATH", 5) == 0 ) {
+ const char* value = &equals[1];
+ const int keyLen = equals-keyEqualsValue;
+ char key[keyLen+1];
+ strncpy(key, keyEqualsValue, keyLen);
+ key[keyLen] = '\0';
+ //dyld::log("processing: %s\n", keyEqualsValue);
+ //dyld::log("mainExecutableDir: %s\n", mainExecutableDir);
+ processDyldEnvironmentVariable(key, value, mainExecutableDir);
+ }
+ }
+ }
+ }
+ break;
+ }
+ cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
+ }
+}
+#endif // SUPPORT_LC_DYLD_ENVIRONMENT
+
+
+static bool hasCodeSignatureLoadCommand(const macho_header* mh)
+{
+ const uint32_t cmd_count = mh->ncmds;
+ const struct load_command* const cmds = (struct load_command*)(((char*)mh)+sizeof(macho_header));
+ const struct load_command* cmd = cmds;
+ for (uint32_t i = 0; i < cmd_count; ++i) {
+ if (cmd->cmd == LC_CODE_SIGNATURE)
+ return true;
+ cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
+ }
+ return false;
+}
+
+
+#if SUPPORT_VERSIONED_PATHS
+static void checkVersionedPaths()
+{
+ // search DYLD_VERSIONED_LIBRARY_PATH directories for dylibs and check if they are newer
+ if ( sEnv.DYLD_VERSIONED_LIBRARY_PATH != NULL ) {
+ for(const char* const* lp = sEnv.DYLD_VERSIONED_LIBRARY_PATH; *lp != NULL; ++lp) {
+ checkDylibOverridesInDir(*lp);
+ }
+ }
+
+ // search DYLD_VERSIONED_FRAMEWORK_PATH directories for dylibs and check if they are newer
+ if ( sEnv.DYLD_VERSIONED_FRAMEWORK_PATH != NULL ) {
+ for(const char* const* fp = sEnv.DYLD_VERSIONED_FRAMEWORK_PATH; *fp != NULL; ++fp) {
+ checkFrameworkOverridesInDir(*fp);
+ }
+ }
+}
+#endif
+
+
+//
+// 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)
+{
+ // 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;
+// <rdar://11894054> Disable warnings about DYLD_ env vars being ignored. The warnings are causing too much confusion.
+#if 0
+ if ( removedCount != 0 ) {
+ dyld::log("dyld: DYLD_ environment variables being ignored because ");
+ switch (sRestrictedReason) {
+ case restrictedNot:
+ break;
+ case restrictedBySetGUid:
+ dyld::log("main executable (%s) is setuid or setgid\n", sExecPath);
+ break;
+ case restrictedBySegment:
+ dyld::log("main executable (%s) has __RESTRICT/__restrict section\n", sExecPath);
+ break;
+ case restrictedByEntitlements:
+ dyld::log("main executable (%s) is code signed with entitlements\n", sExecPath);
+ break;
+ }
+ }
+#endif
+ // slide apple parameters
+ if ( removedCount > 0 ) {
+ *applep = d;
+ do {
+ *d = d[removedCount];
+ } while ( *d++ != NULL );
+ for(int i=0; i < removedCount; ++i)
+ *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';
+ processDyldEnvironmentVariable(key, value, NULL);
+ }
+ }
+ 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, NULL);
+ }
+ }
+
+#if SUPPORT_LC_DYLD_ENVIRONMENT
+ checkLoadCommandEnvironmentVariables();
+#endif // SUPPORT_LC_DYLD_ENVIRONMENT
+
+ // 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;
+ }
+
+ // <rdar://problem/11281064> DYLD_IMAGE_SUFFIX and DYLD_ROOT_PATH cannot be used together
+ if ( (gLinkContext.imageSuffix != NULL) && (gLinkContext.rootPaths != NULL) ) {
+ dyld::warn("Ignoring DYLD_IMAGE_SUFFIX because DYLD_ROOT_PATH is used.\n");
+ gLinkContext.imageSuffix = NULL;
+ }
+
+#if SUPPORT_VERSIONED_PATHS
+ checkVersionedPaths();
+#endif
+}
+
+
+static void getHostInfo()
+{
+#if CPU_SUBTYPES_SUPPORTED
+#if __ARM_ARCH_7A__
+ sHostCPU = CPU_TYPE_ARM;
+ sHostCPUsubtype = CPU_SUBTYPE_ARM_V7;
+#elif __ARM_ARCH_6K__
+ sHostCPU = CPU_TYPE_ARM;
+ sHostCPUsubtype = CPU_SUBTYPE_ARM_V6;
+#elif __ARM_ARCH_7F__
+ sHostCPU = CPU_TYPE_ARM;
+ sHostCPUsubtype = CPU_SUBTYPE_ARM_V7F;
+#elif __ARM_ARCH_7S__
+ sHostCPU = CPU_TYPE_ARM;
+ sHostCPUsubtype = CPU_SUBTYPE_ARM_V7S;
+#elif __ARM_ARCH_7K__
+ sHostCPU = CPU_TYPE_ARM;
+ sHostCPUsubtype = CPU_SUBTYPE_ARM_V7K;
+#else
+ 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);
+ if ( result != KERN_SUCCESS )
+ throw "host_info() failed";
+ sHostCPU = info.cpu_type;
+ sHostCPUsubtype = info.cpu_subtype;
+#endif
+#endif
+}
+
+static void checkSharedRegionDisable()
+{
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
+ // if main executable has segments that overlap the shared region,
+ // then disable using the shared region
+ if ( sMainExecutable->overlapsWithAddressRange((void*)(uintptr_t)SHARED_REGION_BASE, (void*)(uintptr_t)(SHARED_REGION_BASE + SHARED_REGION_SIZE)) ) {
+ gLinkContext.sharedRegionMode = ImageLoader::kDontUseSharedRegion;
+ if ( gLinkContext.verboseMapping )
+ dyld::warn("disabling shared region because main executable overlaps\n");
+ }
+#endif
+ // iPhoneOS cannot run without shared region
+}
+
+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)
+{
+ return findMappedRange((uintptr_t)target);
+}
+
+
+ImageLoader* findImageContainingAddress(const void* addr)
+{
+ return findMappedRange((uintptr_t)addr);
+}
+
+
+ImageLoader* findImageContainingSymbol(const void* symbol)
+{
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ ImageLoader* anImage = *it;
+ if ( anImage->containsSymbol(symbol) )
+ 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.
+//
+
+
+#if __arm__
+//
+// ARM sub-type lists
+//
+const int kARM_RowCount = 8;
+static const cpu_subtype_t kARM[kARM_RowCount][9] = {
+
+ // armv7f can run: v7f, v7, v6, v5, and v4
+ { CPU_SUBTYPE_ARM_V7F, CPU_SUBTYPE_ARM_V7, CPU_SUBTYPE_ARM_V6, CPU_SUBTYPE_ARM_V5TEJ, CPU_SUBTYPE_ARM_V4T, CPU_SUBTYPE_ARM_ALL, CPU_SUBTYPE_END_OF_LIST },
+
+ // armv7k can run: v7k, v6, v5, and v4
+ { CPU_SUBTYPE_ARM_V7K, CPU_SUBTYPE_ARM_V6, CPU_SUBTYPE_ARM_V5TEJ, CPU_SUBTYPE_ARM_V4T, CPU_SUBTYPE_ARM_ALL, CPU_SUBTYPE_END_OF_LIST },
+
+ // armv7s can run: v7s, v7, v7f, v7k, v6, v5, and v4
+ { CPU_SUBTYPE_ARM_V7S, CPU_SUBTYPE_ARM_V7, CPU_SUBTYPE_ARM_V7F, CPU_SUBTYPE_ARM_V7K, CPU_SUBTYPE_ARM_V6, CPU_SUBTYPE_ARM_V5TEJ, CPU_SUBTYPE_ARM_V4T, CPU_SUBTYPE_ARM_ALL, CPU_SUBTYPE_END_OF_LIST },
+
+ // armv7 can run: v7, v6, v5, and v4
+ { CPU_SUBTYPE_ARM_V7, CPU_SUBTYPE_ARM_V6, CPU_SUBTYPE_ARM_V5TEJ, CPU_SUBTYPE_ARM_V4T, CPU_SUBTYPE_ARM_ALL, CPU_SUBTYPE_END_OF_LIST },
+
+ // armv6 can run: v6, v5, and v4
+ { CPU_SUBTYPE_ARM_V6, CPU_SUBTYPE_ARM_V5TEJ, CPU_SUBTYPE_ARM_V4T, CPU_SUBTYPE_ARM_ALL, CPU_SUBTYPE_END_OF_LIST, CPU_SUBTYPE_END_OF_LIST },
+
+ // xscale can run: xscale, v5, and v4
+ { CPU_SUBTYPE_ARM_XSCALE, CPU_SUBTYPE_ARM_V5TEJ, CPU_SUBTYPE_ARM_V4T, CPU_SUBTYPE_ARM_ALL, CPU_SUBTYPE_END_OF_LIST, CPU_SUBTYPE_END_OF_LIST },
+
+ // armv5 can run: v5 and v4
+ { CPU_SUBTYPE_ARM_V5TEJ, CPU_SUBTYPE_ARM_V4T, CPU_SUBTYPE_ARM_ALL, CPU_SUBTYPE_END_OF_LIST, CPU_SUBTYPE_END_OF_LIST, CPU_SUBTYPE_END_OF_LIST },
+
+ // armv4 can run: v4
+ { CPU_SUBTYPE_ARM_V4T, CPU_SUBTYPE_ARM_ALL, CPU_SUBTYPE_END_OF_LIST, CPU_SUBTYPE_END_OF_LIST, CPU_SUBTYPE_END_OF_LIST, CPU_SUBTYPE_END_OF_LIST },
+};
+#endif
+
+
+// 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) {
+#if __arm__
+ case CPU_TYPE_ARM:
+ for (int i=0; i < kARM_RowCount ; ++i) {
+ if ( kARM[i][0] == subtype )
+ return kARM[i];
+ }
+ break;
+#endif
+ }
+ 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) {
+#if __arm__
+ case CPU_TYPE_ARM:
+ if ( (cpu_subtype_t)OSSwapBigToHostInt32(archs[i].cpusubtype) == CPU_SUBTYPE_ARM_ALL ) {
+ *offset = OSSwapBigToHostInt32(archs[i].offset);
+ *len = OSSwapBigToHostInt32(archs[i].size);
+ return true;
+ }
+ break;
+#endif
+ }
+ }
+ }
+ 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, const char* path)
+{
+#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
+ throwf("incompatible cpu-subtype: 0x%08X in %s", mh->cpusubtype, path);
+ }
+ // 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_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 macho_header* mh, uintptr_t slide, const char* path)
+{
+ // try mach-o loader
+ if ( isCompatibleMachO((const uint8_t*)mh, path) ) {
+ ImageLoader* image = ImageLoaderMachO::instantiateMainExecutable(mh, slide, path, gLinkContext);
+ addImage(image);
+ return image;
+ }
+
+ throw "main executable not a known format";
+}
+
+
+#if DYLD_SHARED_CACHE_SUPPORT
+static bool findInSharedCacheImage(const char* path, const struct stat* stat_buf, const macho_header** mh, const char** pathInCache, long* slide)
+{
+ if ( sSharedCache != NULL ) {
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
+ // Mac OS X always requires inode/mtime to valid cache
+ // if stat() not done yet, do it now
+ struct stat statb;
+ if ( stat_buf == NULL ) {
+ if ( my_stat(path, &statb) == -1 )
+ return false;
+ stat_buf = &statb;
+ }
+#endif
+ // 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) {
+#if __IPHONE_OS_VERSION_MIN_REQUIRED
+ // just check path
+ const char* aPath = (char*)sSharedCache + p->pathFileOffset;
+ if ( strcmp(path, aPath) == 0 ) {
+ // found image in cache
+ *mh = (macho_header*)(p->address+sSharedCacheSlide);
+ *pathInCache = aPath;
+ *slide = sSharedCacheSlide;
+ return true;
+ }
+#elif __MAC_OS_X_VERSION_MIN_REQUIRED
+ // check mtime and inode first because it is fast
+ if ( sSharedCacheIgnoreInodeAndTimeStamp
+ || ( ((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* aPath = (char*)sSharedCache + p->pathFileOffset;
+ bool cacheHit = (strcmp(path, aPath) == 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 ( my_stat(aPath, &pathInCacheStatBuf) != -1 )
+ cacheHit = ( (pathInCacheStatBuf.st_dev == stat_buf->st_dev) && (pathInCacheStatBuf.st_ino == stat_buf->st_ino) );
+ }
+ if ( cacheHit ) {
+ // found image in cache, return info
+ *mh = (macho_header*)(p->address+sSharedCacheSlide);
+ //dyld::log("findInSharedCacheImage(), mh=%p, p->address=0x%0llX, slid=0x%0lX, path=%p\n",
+ // *mh, p->address, sSharedCacheSlide, aPath);
+ *pathInCache = aPath;
+ *slide = sSharedCacheSlide;
+ return true;
+ }
+ }
+#endif
+ }
+ }
+ return false;
+}
+
+bool inSharedCache(const char* path)
+{
+ const macho_header* mhInCache;
+ const char* pathInCache;
+ long slide;
+ return findInSharedCacheImage(path, NULL, &mhInCache, &pathInCache, &slide);
+}
+
+#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);
+ removeImage(image);
+ ImageLoader::deleteImage(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";
+
+ // regular main executables cannot be loaded
+ if ( image->isExecutable() ) {
+ if ( !context.canBePIE || !image->isPositionIndependentExecutable() )
+ throw "can't load a main executable";
+ }
+
+ // 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, const 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 ) {
+ if ( pread(fd, firstPage, fileLength, 0) != (ssize_t)fileLength )
+ throwf("pread of short file failed: %d", errno);
+ shortPage = true;
+ }
+ else {
+ if ( pread(fd, firstPage, 4096,0) != 4096 )
+ throwf("pread of first 4K failed: %d", errno);
+ }
+
+ // 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) ) {
+ if ( (fileOffset+fileLength) > (uint64_t)(stat_buf.st_size) )
+ throwf("truncated fat file. file length=%llu, but needed slice goes to %llu", stat_buf.st_size, fileOffset+fileLength);
+ if (pread(fd, firstPage, 4096, fileOffset) != 4096)
+ throwf("pread of fat file failed: %d", errno);
+ }
+ else {
+ throw "no matching architecture in universal wrapper";
+ }
+ }
+
+ // try mach-o loader
+ if ( shortPage )
+ throw "file too short";
+ if ( isCompatibleMachO(firstPage, path) ) {
+
+ // only MH_BUNDLE, MH_DYLIB, and some MH_EXECUTE can be dynamically loaded
+ switch ( ((mach_header*)firstPage)->filetype ) {
+ case MH_EXECUTE:
+ case MH_DYLIB:
+ case MH_BUNDLE:
+ break;
+ default:
+ throw "mach-o, but wrong filetype";
+ }
+
+ // instantiate an image
+ ImageLoader* image = ImageLoaderMachO::instantiateFromFile(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]);
+ }
+}
+
+
+static ImageLoader* loadPhase5open(const char* path, const LoadContext& context, const struct stat& stat_buf, std::vector<const char*>* exceptions)
+{
+ //dyld::log("%s(%s, %p)\n", __func__ , path, exceptions);
+
+ // open file (automagically closed when this function exits)
+ FileOpener file(path);
+
+ // just return NULL if file not found, but record any other errors
+ if ( file.getFileDescriptor() == -1 ) {
+ int err = errno;
+ if ( err != ENOENT ) {
+ const char* newMsg = dyld::mkstringf("%s: open() failed with errno=%d", path, err);
+ exceptions->push_back(newMsg);
+ }
+ 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;
+ }
+}
+
+
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
+static ImageLoader* loadPhase5load(const char* path, const char* orgPath, 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 ( my_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
+ const macho_header* mhInCache;
+ const char* pathInCache;
+ long slideInCache;
+ if ( findInSharedCacheImage(path, &stat_buf, &mhInCache, &pathInCache, &slideInCache) ) {
+ image = ImageLoaderMachO::instantiateFromCache(mhInCache, pathInCache, slideInCache, stat_buf, gLinkContext);
+ return checkandAddImage(image, context);
+ }
+#endif
+ // file exists and is not in dyld shared cache, so open it
+ return loadPhase5open(path, context, stat_buf, exceptions);
+}
+#endif // __MAC_OS_X_VERSION_MIN_REQUIRED
+
+
+
+#if __IPHONE_OS_VERSION_MIN_REQUIRED
+static ImageLoader* loadPhase5stat(const char* path, const LoadContext& context, struct stat* stat_buf,
+ int* statErrNo, bool* imageFound, std::vector<const char*>* exceptions)
+{
+ ImageLoader* image = NULL;
+ *imageFound = false;
+ *statErrNo = 0;
+ if ( my_stat(path, stat_buf) == 0 ) {
+ // in case image was renamed or found via symlinks, check for inode match
+ image = findLoadedImage(*stat_buf);
+ if ( image != NULL ) {
+ *imageFound = true;
+ return image;
+ }
+ // do nothing if not already loaded and if RTLD_NOLOAD
+ if ( context.dontLoad ) {
+ *imageFound = true;
+ return NULL;
+ }
+ image = loadPhase5open(path, context, *stat_buf, exceptions);
+ if ( image != NULL ) {
+ *imageFound = true;
+ return image;
+ }
+ }
+ else {
+ *statErrNo = errno;
+ }
+ return NULL;
+}
+
+// try to open file
+static ImageLoader* loadPhase5load(const char* path, const char* orgPath, const LoadContext& context, std::vector<const char*>* exceptions)
+{
+ //dyld::log("%s(%s, %p)\n", __func__ , path, exceptions);
+ struct stat stat_buf;
+ bool imageFound;
+ int statErrNo;
+ ImageLoader* image;
+#if DYLD_SHARED_CACHE_SUPPORT
+ if ( sDylibsOverrideCache ) {
+ // flag is set that allows installed framework roots to override dyld shared cache
+ image = loadPhase5stat(path, context, &stat_buf, &statErrNo, &imageFound, exceptions);
+ if ( imageFound )
+ return image;
+ }
+ // see if this image is in shared cache
+ const macho_header* mhInCache;
+ const char* pathInCache;
+ long slideInCache;
+ if ( findInSharedCacheImage(path, NULL, &mhInCache, &pathInCache, &slideInCache) ) {
+ // see if this image in the cache was already loaded via a different path
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); ++it) {
+ ImageLoader* anImage = *it;
+ if ( (const macho_header*)anImage->machHeader() == mhInCache )
+ return anImage;
+ }
+ // do nothing if not already loaded and if RTLD_NOLOAD
+ if ( context.dontLoad )
+ return NULL;
+ // nope, so instantiate a new image from dyld shared cache
+ // <rdar://problem/7014995> zero out stat buffer so mtime, etc are zero for items from the shared cache
+ bzero(&stat_buf, sizeof(stat_buf));
+ image = ImageLoaderMachO::instantiateFromCache(mhInCache, pathInCache, slideInCache, stat_buf, gLinkContext);
+ return checkandAddImage(image, context);
+ }
+
+ if ( !sDylibsOverrideCache ) {
+ // flag is not set, and not in cache to try opening it
+ image = loadPhase5stat(path, context, &stat_buf, &statErrNo, &imageFound, exceptions);
+ if ( imageFound )
+ return image;
+ }
+#else
+ image = loadPhase5stat(path, context, &stat_buf, &statErrNo, &imageFound, exceptions);
+ if ( imageFound )
+ return image;
+#endif
+ // just return NULL if file not found, but record any other errors
+ if ( (statErrNo != ENOENT) && (statErrNo != 0) ) {
+ exceptions->push_back(dyld::mkstringf("%s: stat() failed with errno=%d", path, statErrNo));
+ }
+ return NULL;
+}
+#endif // __IPHONE_OS_VERSION_MIN_REQUIRED
+
+
+// look for path match with existing loaded images
+static ImageLoader* loadPhase5check(const char* path, const char* orgPath, const LoadContext& context)
+{
+ //dyld::log("%s(%s, %s)\n", __func__ , path, orgPath);
+ // search path against load-path and install-path of all already loaded images
+ uint32_t hash = ImageLoader::hash(path);
+ //dyld::log("check() hash=%d, path=%s\n", hash, path);
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ ImageLoader* anImage = *it;
+ // check hash first to cut down on strcmp calls
+ //dyld::log(" check() hash=%d, path=%s\n", anImage->getPathHash(), anImage->getPath());
+ 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;
+ }
+ }
+ }
+ // an install name starting with @rpath should match by install name, not just real path
+ if ( (orgPath[0] == '@') && (strncmp(orgPath, "@rpath/", 7) == 0) ) {
+ const char* installPath = anImage->getInstallPath();
+ if ( installPath != NULL) {
+ if ( !context.mustBeDylib || anImage->isDylib() ) {
+ if ( strcmp(orgPath, installPath) == 0 )
+ return anImage;
+ }
+ }
+ }
+ }
+
+ //dyld::log("%s(%s) => NULL\n", __func__, path);
+ return NULL;
+}
+
+
+// open or check existing
+static ImageLoader* loadPhase5(const char* path, const char* orgPath, const LoadContext& context, std::vector<const char*>* exceptions)
+{
+ //dyld::log("%s(%s, %p)\n", __func__ , path, exceptions);
+
+ // check for specific dylib overrides
+ for (std::vector<DylibOverride>::iterator it = sDylibOverrides.begin(); it != sDylibOverrides.end(); ++it) {
+ if ( strcmp(it->installName, path) == 0 ) {
+ path = it->override;
+ break;
+ }
+ }
+
+ if ( exceptions != NULL )
+ return loadPhase5load(path, orgPath, context, exceptions);
+ else
+ return loadPhase5check(path, orgPath, context);
+}
+
+// try with and without image suffix
+static ImageLoader* loadPhase4(const char* path, const char* orgPath, 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, orgPath, context, exceptions);
+ }
+ if ( image == NULL )
+ image = loadPhase5(path, orgPath, context, exceptions);
+ return image;
+}
+
+static ImageLoader* loadPhase2(const char* path, const char* orgPath, 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 char* orgPath, 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 ( sProcessIsRestricted )
+ throwf("unsafe use of @executable_path in %s with restricted 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, orgPath, 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, orgPath, 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 ( sProcessIsRestricted && (strcmp(context.origin, sExecPath) == 0) )
+ throwf("unsafe use of @loader_path in %s with restricted 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, orgPath, 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, orgPath, 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, orgPath, context, exceptions);
+ if ( gLinkContext.verboseRPaths && (exceptions != NULL) ) {
+ if ( image != NULL )
+ dyld::log("RPATH successful expansion of %s to: %s\n", orgPath, newPath);
+ else
+ dyld::log("RPATH failed to expanding %s to: %s\n", orgPath, newPath);
+ }
+ if ( image != NULL )
+ return image;
+ }
+ }
+ }
+
+ // substitute @rpath with LD_LIBRARY_PATH
+ if ( sEnv.LD_LIBRARY_PATH != NULL ) {
+ image = loadPhase2(trailingPath, orgPath, 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 (sProcessIsRestricted && (path[0] != '/' )) {
+ throwf("unsafe use of relative rpath %s in %s with restricted binary", path, context.origin);
+ }
+
+ return loadPhase4(path, orgPath, context, exceptions);
+}
+
+
+// try search paths
+static ImageLoader* loadPhase2(const char* path, const char* orgPath, 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, orgPath, context, exceptions);
+ if ( image != NULL )
+ return image;
+ }
+ }
+ }
+ // <rdar://problem/12649639> An executable with the same name as a framework & DYLD_LIBRARY_PATH pointing to it gets loaded twice
+ // <rdar://problem/14160846> Some apps depend on frameworks being found via library paths
+ if ( (libraryPaths != NULL) && ((frameworkPartialPath == NULL) || sFrameworksFoundAsDylibs) ) {
+ 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, orgPath, context, exceptions);
+ if ( image != NULL )
+ return image;
+ }
+ }
+ return NULL;
+}
+
+// try search overrides and fallbacks
+static ImageLoader* loadPhase1(const char* path, const char* orgPath, 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, orgPath, 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, orgPath, context, sEnv.DYLD_FRAMEWORK_PATH, sEnv.DYLD_LIBRARY_PATH, exceptions);
+ if ( image != NULL )
+ return image;
+ }
+
+ // try raw path
+ image = loadPhase3(path, orgPath, context, exceptions);
+ if ( image != NULL )
+ return image;
+
+ // try fallback paths during second time (will open file)
+ const char* const* fallbackLibraryPaths = sEnv.DYLD_FALLBACK_LIBRARY_PATH;
+ if ( (fallbackLibraryPaths != NULL) && !context.useFallbackPaths )
+ fallbackLibraryPaths = NULL;
+ if ( !context.dontLoad && (exceptions != NULL) && ((sEnv.DYLD_FALLBACK_FRAMEWORK_PATH != NULL) || (fallbackLibraryPaths != NULL)) ) {
+ image = loadPhase2(path, orgPath, context, sEnv.DYLD_FALLBACK_FRAMEWORK_PATH, fallbackLibraryPaths, exceptions);
+ if ( image != NULL )
+ return image;
+ }
+
+ return NULL;
+}
+
+// try root substitutions
+static ImageLoader* loadPhase0(const char* path, const char* orgPath, 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 ( (gLinkContext.rootPaths != NULL) && (path[0] == '/') ) {
+ for(const char* const* rootPath = gLinkContext.rootPaths ; *rootPath != NULL; ++rootPath) {
+ char newPath[strlen(*rootPath) + strlen(path)+2];
+ strcpy(newPath, *rootPath);
+ strcat(newPath, path);
+ ImageLoader* image = loadPhase1(newPath, orgPath, context, exceptions);
+ if ( image != NULL )
+ return image;
+ }
+ }
+
+ // try raw path
+ return loadPhase1(path, orgPath, 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)
+{
+ CRSetCrashLogMessage2(path);
+ const char* orgPath = path;
+
+ //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, orgPath, context, NULL);
+ if ( image != NULL ) {
+ CRSetCrashLogMessage2(NULL);
+ return image;
+ }
+
+ // try all path permutations and try open() until first success
+ std::vector<const char*> exceptions;
+ image = loadPhase0(path, orgPath, context, &exceptions);
+ CRSetCrashLogMessage2(NULL);
+ if ( image != NULL ) {
+ // <rdar://problem/6916014> leak in dyld during dlopen when using DYLD_ variables
+ for (std::vector<const char*>::iterator it = exceptions.begin(); it != exceptions.end(); ++it) {
+ free((void*)(*it));
+ }
+#if __IPHONE_OS_VERSION_MIN_REQUIRED && DYLD_SHARED_CACHE_SUPPORT
+ // if loaded image is not from cache, but original path is in cache
+ // set gSharedCacheOverridden flag to disable some ObjC optimizations
+ if ( !gSharedCacheOverridden ) {
+ if ( !image->inSharedCache() && inSharedCache(path) ) {
+ gSharedCacheOverridden = true;
+ }
+ }
+#endif
+ return image;
+ }
+ else if ( exceptions.size() == 0 ) {
+ if ( context.dontLoad ) {
+ return NULL;
+ }
+ else
+ 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
+
+
+
+#if __i386__
+ #define ARCH_NAME "i386"
+ #define ARCH_CACHE_MAGIC "dyld_v1 i386"
+#elif __x86_64__
+ #define ARCH_NAME "x86_64"
+ #define ARCH_CACHE_MAGIC "dyld_v1 x86_64"
+#elif __ARM_ARCH_5TEJ__
+ #define ARCH_NAME "armv5"
+ #define ARCH_CACHE_MAGIC "dyld_v1 armv5"
+#elif __ARM_ARCH_6K__
+ #define ARCH_NAME "armv6"
+ #define ARCH_CACHE_MAGIC "dyld_v1 armv6"
+#elif __ARM_ARCH_7F__
+ #define ARCH_NAME "armv7f"
+ #define ARCH_CACHE_MAGIC "dyld_v1 armv7f"
+#elif __ARM_ARCH_7A__
+ #define ARCH_NAME "armv7"
+ #define ARCH_CACHE_MAGIC "dyld_v1 armv7"
+#elif __ARM_ARCH_7S__
+ #define ARCH_NAME "armv7s"
+ #define ARCH_CACHE_MAGIC "dyld_v1 armv7s"
+#elif __ARM_ARCH_7K__
+ #define ARCH_NAME "armv7k"
+ #define ARCH_CACHE_MAGIC "dyld_v1 armv7k"
+#endif
+
+
+static int __attribute__((noinline)) _shared_region_check_np(uint64_t* start_address)
+{
+ if ( gLinkContext.sharedRegionMode == ImageLoader::kUseSharedRegion )
+ return syscall(294, start_address);
+ return -1;
+}
+
+
+static int __attribute__((noinline)) _shared_region_map_and_slide_np(int fd, uint32_t count, const shared_file_mapping_np mappings[],
+ int codeSignatureMappingIndex, int slide, void* slideInfo, uint32_t slideInfoSize)
+{
+ // register code signature blob for whole dyld cache
+ if ( codeSignatureMappingIndex != -1 ) {
+ fsignatures_t siginfo;
+ siginfo.fs_file_start = 0; // cache always starts at beginning of file
+ siginfo.fs_blob_start = (void*)mappings[codeSignatureMappingIndex].sfm_file_offset;
+ siginfo.fs_blob_size = mappings[codeSignatureMappingIndex].sfm_size;
+ int result = fcntl(fd, F_ADDFILESIGS, &siginfo);
+ // <rdar://problem/12891874> don't warn in chrooted case because mapping syscall is about to fail too
+ if ( (result == -1) && gLinkContext.verboseMapping )
+ dyld::log("dyld: code signature registration for shared cache failed with errno=%d\n", errno);
+ }
+
+ if ( gLinkContext.sharedRegionMode == ImageLoader::kUseSharedRegion ) {
+ return syscall(438, fd, count, mappings, slide, slideInfo, slideInfoSize);
+ }
+
+ // remove the shared region sub-map
+ vm_deallocate(mach_task_self(), (vm_address_t)SHARED_REGION_BASE, SHARED_REGION_SIZE);
+
+ // notify gdb or other lurkers that this process is no longer using the shared region
+ dyld::gProcessInfo->processDetachedFromSharedRegion = true;
+
+ // map cache just for this process with mmap()
+ const shared_file_mapping_np* const start = mappings;
+ const shared_file_mapping_np* const 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;
+ //dyld::log("dyld: mapping address %p with size 0x%08lX\n", mmapAddress, 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;
+ if ( mmap(mmapAddress, size, protection, MAP_FIXED | MAP_PRIVATE, fd, offset) != mmapAddress ) {
+ // failed to map some chunk of this shared cache file
+ // clear shared region
+ vm_deallocate(mach_task_self(), (vm_address_t)SHARED_REGION_BASE, SHARED_REGION_SIZE);
+ // go back to not using shared region at all
+ gLinkContext.sharedRegionMode = ImageLoader::kDontUseSharedRegion;
+ if ( gLinkContext.verboseMapping ) {
+ dyld::log("dyld: shared cached region cannot be mapped at address %p with size 0x%08lX\n",
+ mmapAddress, size);
+ }
+ // return failure
+ return -1;
+ }
+ }
+
+ // update all __DATA pages with slide info
+ if ( slide != 0 ) {
+ const uintptr_t dataPagesStart = mappings[1].sfm_address;
+ const dyld_cache_slide_info* slideInfoHeader = (dyld_cache_slide_info*)slideInfo;
+ const uint16_t* toc = (uint16_t*)((long)(slideInfoHeader) + slideInfoHeader->toc_offset);
+ const uint8_t* entries = (uint8_t*)((long)(slideInfoHeader) + slideInfoHeader->entries_offset);
+ for(uint32_t i=0; i < slideInfoHeader->toc_count; ++i) {
+ const uint8_t* entry = &entries[toc[i]*slideInfoHeader->entries_size];
+ const uint8_t* page = (uint8_t*)(long)(dataPagesStart + (4096*i));
+ //dyld::log("page=%p toc[%d]=%d entries=%p\n", page, i, toc[i], entry);
+ for(int j=0; j < 128; ++j) {
+ uint8_t b = entry[j];
+ //dyld::log(" entry[%d] = 0x%02X\n", j, b);
+ if ( b != 0 ) {
+ for(int k=0; k < 8; ++k) {
+ if ( b & (1<<k) ) {
+ uintptr_t* p = (uintptr_t*)(page + j*8*4 + k*4);
+ uintptr_t value = *p;
+ //dyld::log(" *%p was 0x%lX will be 0x%lX\n", p, value, value+sSharedCacheSlide);
+ *p = value + slide;
+ }
+ }
+ }
+ }
+ }
+ }
+
+ // succesfully mapped shared cache for just this process
+ gLinkContext.sharedRegionMode = ImageLoader::kUsePrivateSharedRegion;
+
+ return 0;
+}
+
+
+const void* imMemorySharedCacheHeader()
+{
+ return sSharedCache;
+}
+
+int openSharedCacheFile()
+{
+ char path[MAXPATHLEN];
+ strlcpy(path, sSharedCacheDir, MAXPATHLEN);
+ strlcat(path, "/", MAXPATHLEN);
+ strlcat(path, DYLD_SHARED_CACHE_BASE_NAME ARCH_NAME, MAXPATHLEN);
+ return my_open(path, O_RDONLY, 0);
+}
+
+static long pickCacheSlide(uint32_t mappingsCount, shared_file_mapping_np mappings[])
+{
+#if __x86_64__
+ // x86_64 has a two memory regions:
+ // 256MB at 0x00007FFF70000000
+ // 1024MB at 0x00007FFF80000000
+ // Some old shared caches have r/w region after rx region, so all regions slide within 1GB range
+ // Newer shared caches have r/w region based at 0x7FFF70000000 and r/o regions at 0x7FFF80000000, so each part has max slide
+ if ( (mappingsCount >= 3) && (mappings[1].sfm_init_prot == (VM_PROT_READ|VM_PROT_WRITE)) && (mappings[1].sfm_address == 0x00007FFF70000000) ) {
+ const uint64_t rwSize = mappings[1].sfm_size;
+ const uint64_t rwSlop = 0x10000000ULL - rwSize;
+ const uint64_t roSize = (mappings[2].sfm_address + mappings[2].sfm_size) - mappings[0].sfm_address;
+ const uint64_t roSlop = 0x40000000ULL - roSize;
+ const uint64_t space = (rwSlop < roSlop) ? rwSlop : roSlop;
+
+ // choose new random slide
+ long slide = (arc4random() % space) & (-4096);
+ //dyld::log("rwSlop=0x%0llX, roSlop=0x%0llX\n", rwSlop, roSlop);
+ //dyld::log("space=0x%0llX, slide=0x%0lX\n", space, slide);
+
+ // update mappings
+ for(uint32_t i=0; i < mappingsCount; ++i) {
+ mappings[i].sfm_address += slide;
+ }
+
+ return slide;
+ }
+ // else fall through to handle old style cache
+#endif
+ // get bounds of cache
+ uint64_t lowAddress = 0;
+ uint64_t highAddress = 0;
+ for(uint32_t i=0; i < mappingsCount; ++i) {
+ if ( lowAddress == 0 ) {
+ lowAddress = mappings[i].sfm_address;
+ highAddress = mappings[i].sfm_address + mappings[i].sfm_size;
+ }
+ else {
+ if ( mappings[i].sfm_address < lowAddress )
+ lowAddress = mappings[i].sfm_address;
+ if ( (mappings[i].sfm_address + mappings[i].sfm_size) > highAddress )
+ highAddress = mappings[i].sfm_address + mappings[i].sfm_size;
+ }
+ }
+
+ // find slop space
+ const uint64_t space = (SHARED_REGION_BASE + SHARED_REGION_SIZE) - highAddress;
+
+ // choose new random slide
+ long slide = (arc4random() % space) & (-4096);
+ //dyld::log("slideSpace=0x%0llX\n", space);
+ //dyld::log("slide=0x%0lX\n", slide);
+
+ // update mappings
+ for(uint32_t i=0; i < mappingsCount; ++i) {
+ mappings[i].sfm_address += slide;
+ }
+
+ return slide;
+}
+
+static void mapSharedCache()
+{
+ uint64_t cacheBaseAddress = 0;
+ // 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");
+ return;
+ }
+ }
+ // check if cache file is slidable
+ const dyld_cache_header* header = sSharedCache;
+ if ( (header->mappingOffset >= 0x48) && (header->slideInfoSize != 0) ) {
+ // solve for slide by comparing loaded address to address of first region
+ const uint8_t* loadedAddress = (uint8_t*)sSharedCache;
+ const dyld_cache_mapping_info* const mappings = (dyld_cache_mapping_info*)(loadedAddress+header->mappingOffset);
+ const uint8_t* preferedLoadAddress = (uint8_t*)(long)(mappings[0].address);
+ sSharedCacheSlide = loadedAddress - preferedLoadAddress;
+ dyld::gProcessInfo->sharedCacheSlide = sSharedCacheSlide;
+ //dyld::log("sSharedCacheSlide=0x%08lX, loadedAddress=%p, preferedLoadAddress=%p\n", sSharedCacheSlide, loadedAddress, preferedLoadAddress);
+ }
+ // if cache has a uuid, copy it
+ if ( header->mappingOffset >= 0x68 ) {
+ memcpy(dyld::gProcessInfo->sharedCacheUUID, header->uuid, 16);
+ }
+ }
+ else {
+#if __i386__ || __x86_64__
+ // <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
+ 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;
+ // Don't use custom DYLD_SHARED_CACHE_DIR if provided, use standard path
+ if ( my_stat(MACOSX_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(MACOSX_DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME ARCH_NAME);
+ gLinkContext.sharedRegionMode = ImageLoader::kDontUseSharedRegion;
+ return;
+ }
+ }
+ }
+ }
+#endif
+ // map in shared cache to shared region
+ int fd = openSharedCacheFile();
+ if ( fd != -1 ) {
+ uint8_t firstPages[8192];
+ if ( ::read(fd, firstPages, 8192) == 8192 ) {
+ dyld_cache_header* header = (dyld_cache_header*)firstPages;
+ if ( strcmp(header->magic, ARCH_CACHE_MAGIC) == 0 ) {
+ const dyld_cache_mapping_info* const fileMappingsStart = (dyld_cache_mapping_info*)&firstPages[header->mappingOffset];
+ const dyld_cache_mapping_info* const fileMappingsEnd = &fileMappingsStart[header->mappingCount];
+ shared_file_mapping_np mappings[header->mappingCount+1]; // add room for code-sig
+ unsigned int mappingCount = header->mappingCount;
+ int codeSignatureMappingIndex = -1;
+ int readWriteMappingIndex = -1;
+ int readOnlyMappingIndex = -1;
+ // validate that the cache file has not been truncated
+ bool goodCache = false;
+ struct stat stat_buf;
+ if ( fstat(fd, &stat_buf) == 0 ) {
+ goodCache = true;
+ int i=0;
+ for (const dyld_cache_mapping_info* p = fileMappingsStart; p < fileMappingsEnd; ++p, ++i) {
+ mappings[i].sfm_address = p->address;
+ mappings[i].sfm_size = p->size;
+ mappings[i].sfm_file_offset = p->fileOffset;
+ mappings[i].sfm_max_prot = p->maxProt;
+ mappings[i].sfm_init_prot = p->initProt;
+ // rdar://problem/5694507 old update_dyld_shared_cache tool could make a cache file
+ // that is not page aligned, but otherwise ok.
+ if ( p->fileOffset+p->size > (uint64_t)(stat_buf.st_size+4095 & (-4096)) ) {
+ dyld::log("dyld: shared cached file is corrupt: %s" DYLD_SHARED_CACHE_BASE_NAME ARCH_NAME "\n", sSharedCacheDir);
+ goodCache = false;
+ }
+ if ( (mappings[i].sfm_init_prot & (VM_PROT_READ|VM_PROT_WRITE)) == (VM_PROT_READ|VM_PROT_WRITE) ) {
+ readWriteMappingIndex = i;
+ }
+ if ( mappings[i].sfm_init_prot == VM_PROT_READ ) {
+ readOnlyMappingIndex = i;
+ }
+ }
+ // if shared cache is code signed, add a mapping for the code signature
+ uint32_t signatureSize = header->codeSignatureSize;
+ // zero size in header means signature runs to end-of-file
+ if ( signatureSize == 0 )
+ signatureSize = stat_buf.st_size - header->codeSignatureOffset;
+ if ( signatureSize != 0 ) {
+ int linkeditMapping = mappingCount-1;
+ codeSignatureMappingIndex = mappingCount++;
+ mappings[codeSignatureMappingIndex].sfm_address = mappings[linkeditMapping].sfm_address + mappings[linkeditMapping].sfm_size;
+ mappings[codeSignatureMappingIndex].sfm_size = (signatureSize+4095) & (-4096);
+ mappings[codeSignatureMappingIndex].sfm_file_offset = header->codeSignatureOffset;
+ mappings[codeSignatureMappingIndex].sfm_max_prot = VM_PROT_READ;
+ mappings[codeSignatureMappingIndex].sfm_init_prot = VM_PROT_READ;
+ }
+ }
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
+ // sanity check that /usr/lib/libSystem.B.dylib stat() info matches cache
+ if ( header->imagesCount * sizeof(dyld_cache_image_info) + header->imagesOffset < 8192 ) {
+ bool foundLibSystem = false;
+ if ( my_stat("/usr/lib/libSystem.B.dylib", &stat_buf) == 0 ) {
+ const dyld_cache_image_info* images = (dyld_cache_image_info*)&firstPages[header->imagesOffset];
+ const dyld_cache_image_info* const imagesEnd = &images[header->imagesCount];
+ for (const dyld_cache_image_info* p = images; p < imagesEnd; ++p) {
+ if ( ((time_t)p->modTime == stat_buf.st_mtime) && ((ino_t)p->inode == stat_buf.st_ino) ) {
+ foundLibSystem = true;
+ break;
+ }
+ }
+ }
+ if ( !sSharedCacheIgnoreInodeAndTimeStamp && !foundLibSystem ) {
+ dyld::log("dyld: shared cached file was built against a different libSystem.dylib, ignoring cache.\n"
+ "to update dyld shared cache run: 'sudo update_dyld_shared_cache' then reboot.\n");
+ goodCache = false;
+ }
+ }
+#endif
+ if ( goodCache && (readWriteMappingIndex == -1) ) {
+ dyld::log("dyld: shared cached file is missing read/write mapping: %s" DYLD_SHARED_CACHE_BASE_NAME ARCH_NAME "\n", sSharedCacheDir);
+ goodCache = false;
+ }
+ if ( goodCache && (readOnlyMappingIndex == -1) ) {
+ dyld::log("dyld: shared cached file is missing read-only mapping: %s" DYLD_SHARED_CACHE_BASE_NAME ARCH_NAME "\n", sSharedCacheDir);
+ goodCache = false;
+ }
+ if ( goodCache ) {
+ long cacheSlide = 0;
+ void* slideInfo = NULL;
+ uint32_t slideInfoSize = 0;
+ // check if shared cache contains slid info
+ if ( header->slideInfoSize != 0 ) {
+ // <rdar://problem/8611968> don't slide shared cache if ASLR disabled (main executable didn't slide)
+ if ( sMainExecutable->isPositionIndependentExecutable() && (sMainExecutable->getSlide() == 0) )
+ cacheSlide = 0;
+ else {
+ // generate random slide amount
+ cacheSlide = pickCacheSlide(mappingCount, mappings);
+ slideInfo = (void*)(long)(mappings[readOnlyMappingIndex].sfm_address + (header->slideInfoOffset - mappings[readOnlyMappingIndex].sfm_file_offset));
+ slideInfoSize = header->slideInfoSize;
+ // add VM_PROT_SLIDE bit to __DATA area of cache
+ mappings[readWriteMappingIndex].sfm_max_prot |= VM_PROT_SLIDE;
+ mappings[readWriteMappingIndex].sfm_init_prot |= VM_PROT_SLIDE;
+ }
+ }
+ if (_shared_region_map_and_slide_np(fd, mappingCount, mappings, codeSignatureMappingIndex, cacheSlide, slideInfo, slideInfoSize) == 0) {
+ // successfully mapped cache into shared region
+ sSharedCache = (dyld_cache_header*)mappings[0].sfm_address;
+ sSharedCacheSlide = cacheSlide;
+ dyld::gProcessInfo->sharedCacheSlide = cacheSlide;
+ //dyld::log("sSharedCache=%p sSharedCacheSlide=0x%08lX\n", sSharedCache, sSharedCacheSlide);
+ // if cache has a uuid, copy it
+ if ( header->mappingOffset >= 0x68 ) {
+ memcpy(dyld::gProcessInfo->sharedCacheUUID, header->uuid, 16);
+ }
+ }
+ else {
+ if ( gLinkContext.verboseMapping )
+ dyld::log("dyld: shared cached file could not be mapped\n");
+ }
+ }
+ }
+ else {
+ if ( gLinkContext.verboseMapping )
+ dyld::log("dyld: shared cached file is invalid\n");
+ }
+ }
+ else {
+ if ( gLinkContext.verboseMapping )
+ dyld::log("dyld: shared cached file cannot be read\n");
+ }
+ close(fd);
+ }
+ else {
+ 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 dyld_cache_mapping_info* const start = (dyld_cache_mapping_info*)((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 from %s/" DYLD_SHARED_CACHE_BASE_NAME ARCH_NAME "\n", sSharedCacheDir);
+ else if ( gLinkContext.sharedRegionMode == ImageLoader::kUsePrivateSharedRegion )
+ dyld::log("dyld: Mapping private shared cache from %s/" DYLD_SHARED_CACHE_BASE_NAME ARCH_NAME "\n", sSharedCacheDir);
+ }
+ const dyld_cache_mapping_info* const end = &start[dyld_shared_cache_ranges.sharedRegionsCount];
+ int index = 0;
+ for (const dyld_cache_mapping_info* p = start; p < end; ++p, ++index ) {
+ dyld_shared_cache_ranges.ranges[index].start = p->address+sSharedCacheSlide;
+ dyld_shared_cache_ranges.ranges[index].length = p->size;
+ if ( gLinkContext.verboseMapping ) {
+ dyld::log(" 0x%08llX->0x%08llX %s%s%s init=%x, max=%x\n",
+ p->address+sSharedCacheSlide, p->address+sSharedCacheSlide+p->size-1,
+ ((p->initProt & VM_PROT_READ) ? "read " : ""),
+ ((p->initProt & VM_PROT_WRITE) ? "write " : ""),
+ ((p->initProt & VM_PROT_EXECUTE) ? "execute " : ""), p->initProt, p->maxProt);
+ }
+ #if __i386__
+ // If a non-writable and executable region is found in the R/W shared region, then this is __IMPORT segments
+ // This is an old cache. Make writable. dyld no longer supports turn W on and off as it binds
+ if ( (p->initProt == (VM_PROT_READ|VM_PROT_EXECUTE)) && ((p->address & 0xF0000000) == 0xA0000000) ) {
+ if ( p->size != 0 ) {
+ vm_prot_t prot = VM_PROT_EXECUTE | PROT_READ | VM_PROT_WRITE;
+ vm_protect(mach_task_self(), p->address, p->size, false, prot);
+ if ( gLinkContext.verboseMapping ) {
+ dyld::log("%18s at 0x%08llX->0x%08llX altered permissions to %c%c%c\n", "", p->address,
+ p->address+p->size-1,
+ (prot & PROT_READ) ? 'r' : '.', (prot & PROT_WRITE) ? 'w' : '.', (prot & PROT_EXEC) ? 'x' : '.' );
+ }
+ }
+ }
+ #endif
+ }
+ if ( gLinkContext.verboseMapping ) {
+ // list the code blob
+ dyld_cache_header* header = (dyld_cache_header*)sSharedCache;
+ uint32_t signatureSize = header->codeSignatureSize;
+ // zero size in header means signature runs to end-of-file
+ if ( signatureSize == 0 ) {
+ struct stat stat_buf;
+ if ( my_stat(IPHONE_DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME ARCH_NAME, &stat_buf) == 0 )
+ signatureSize = stat_buf.st_size - header->codeSignatureOffset;
+ }
+ if ( signatureSize != 0 ) {
+ const dyld_cache_mapping_info* const last = &start[dyld_shared_cache_ranges.sharedRegionsCount-1];
+ uint64_t codeBlobStart = last->address + last->size;
+ dyld::log(" 0x%08llX->0x%08llX (code signature)\n", codeBlobStart, codeBlobStart+signatureSize);
+ }
+ }
+#if __IPHONE_OS_VERSION_MIN_REQUIRED
+ // check for file that enables dyld shared cache dylibs to be overridden
+ struct stat enableStatBuf;
+ sDylibsOverrideCache = ( my_stat(IPHONE_DYLD_SHARED_CACHE_DIR "enable-dylibs-to-override-cache", &enableStatBuf) == 0 );
+#endif
+ }
+}
+#endif // #if DYLD_SHARED_CACHE_SUPPORT
+
+
+
+// create when NSLinkModule is called for a second time on a bundle
+ImageLoader* cloneImage(ImageLoader* image)
+{
+ // 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";
+
+ dyld::LoadContext context;
+ context.useSearchPaths = false;
+ context.useFallbackPaths = false;
+ context.useLdLibraryPath = false;
+ context.implicitRPath = false;
+ context.matchByInstallName = false;
+ context.dontLoad = false;
+ context.mustBeBundle = true;
+ context.mustBeDylib = false;
+ context.canBePIE = false;
+ context.origin = NULL;
+ context.rpath = NULL;
+ return loadPhase6(file.getFileDescriptor(), stat_buf, image->getPath(), context);
+}
+
+
+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, moduleName) ) {
+ ImageLoader* image = ImageLoaderMachO::instantiateFromMemory(moduleName, (macho_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
+ strlcpy(error_string, message, sizeof(error_string));
+}
+
+const char* getErrorMessage()
+{
+ return error_string;
+}
+
+
+void halt(const char* message)
+{
+ dyld::log("dyld: %s\n", message);
+ setErrorMessage(message);
+ uintptr_t terminationFlags = 0;
+ if ( !gLinkContext.startedInitializingMainExecutable )
+ terminationFlags = 1;
+ setAlImageInfosHalt(error_string, terminationFlags);
+ dyld_fatal_error(error_string);
+}
+
+static void setErrorStrings(unsigned errorCode, const char* errorClientOfDylibPath,
+ const char* errorTargetDylibPath, const char* errorSymbol)
+{
+ dyld::gProcessInfo->errorKind = errorCode;
+ dyld::gProcessInfo->errorClientOfDylibPath = errorClientOfDylibPath;
+ dyld::gProcessInfo->errorTargetDylibPath = errorTargetDylibPath;
+ dyld::gProcessInfo->errorSymbol = errorSymbol;
+}
+
+
+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::findImageContainingAddress(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;
+}
+
+
+uintptr_t fastBindLazySymbol(ImageLoader** imageLoaderCache, uintptr_t lazyBindingInfoOffset)
+{
+ uintptr_t result = 0;
+ // get image
+ if ( *imageLoaderCache == NULL ) {
+ // save in cache
+ *imageLoaderCache = dyld::findMappedRange((uintptr_t)imageLoaderCache);
+ if ( *imageLoaderCache == NULL ) {
+ const char* message = "fast lazy binding from unknown image";
+ dyld::log("dyld: %s\n", message);
+ halt(message);
+ }
+ }
+
+ // bind lazy pointer and return it
+ try {
+ result = (*imageLoaderCache)->doBindFastLazySymbol(lazyBindingInfoOffset, gLinkContext,
+ (dyld::gLibSystemHelpers != NULL) ? dyld::gLibSystemHelpers->acquireGlobalDyldLock : NULL,
+ (dyld::gLibSystemHelpers != NULL) ? dyld::gLibSystemHelpers->releaseGlobalDyldLock : NULL);
+ }
+ catch (const char* message) {
+ dyld::log("dyld: lazy symbol binding failed: %s\n", message);
+ halt(message);
+ }
+
+ // return target address to glue which jumps to it with real parameters restored
+ return result;
+}
+
+
+
+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)
+{
+ // 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, 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, false, image);
+ if ( *sym != NULL ) {
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+unsigned int getCoalescedImages(ImageLoader* images[])
+{
+ unsigned int count = 0;
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ ImageLoader* image = *it;
+ if ( image->participatesInCoalescing() ) {
+ *images++ = *it;
+ ++count;
+ }
+ }
+ return count;
+}
+
+
+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 ) {
+ // <rdar://problem/10332417> need updateAllImages() to be last in dyld_image_state_mapped list
+ // so that if ObjC adds a handler that prevents a load, it happens before the gdb list is updated
+ if ( state == dyld_image_state_mapped )
+ handlers->insert(handlers->begin(), handler);
+ else
+ 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->getRealPath();
+ 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, const char* origin, const ImageLoader::RPathChain* rpaths)
+{
+ dyld::LoadContext context;
+ context.useSearchPaths = search;
+ context.useFallbackPaths = search;
+ context.useLdLibraryPath = false;
+ context.implicitRPath = false;
+ context.matchByInstallName = false;
+ context.dontLoad = false;
+ context.mustBeBundle = false;
+ context.mustBeDylib = true;
+ context.canBePIE = false;
+ 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 macho_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.getCoalescedImages = &getCoalescedImages;
+ gLinkContext.undefinedHandler = &undefinedHandler;
+ gLinkContext.getAllMappedRegions = &getMappedRegions;
+ gLinkContext.bindingHandler = NULL;
+ gLinkContext.notifySingle = ¬ifySingle;
+ gLinkContext.notifyBatch = ¬ifyBatch;
+ gLinkContext.removeImage = &removeImage;
+ gLinkContext.registerDOFs = ®isterDOFs;
+ gLinkContext.clearAllDepths = &clearAllDepths;
+ gLinkContext.printAllDepths = &printAllDepths;
+ gLinkContext.imageCount = &imageCount;
+ gLinkContext.setNewProgramVars = &setNewProgramVars;
+#if DYLD_SHARED_CACHE_SUPPORT
+ gLinkContext.inSharedCache = &inSharedCache;
+#endif
+ gLinkContext.setErrorStrings = &setErrorStrings;
+#if SUPPORT_OLD_CRT_INITIALIZATION
+ gLinkContext.setRunInitialzersOldWay= &setRunInitialzersOldWay;
+#endif
+ gLinkContext.findImageContainingAddress = &findImageContainingAddress;
+ gLinkContext.addDynamicReference = &addDynamicReference;
+ 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 __LP64__
+ #define LC_SEGMENT_COMMAND LC_SEGMENT_64
+ #define macho_segment_command segment_command_64
+ #define macho_section section_64
+#else
+ #define LC_SEGMENT_COMMAND LC_SEGMENT
+ #define macho_segment_command segment_command
+ #define macho_section section
+#endif
+
+
+//
+// Look for a special segment in the mach header.
+// Its presences means that the binary wants to have DYLD ignore
+// DYLD_ environment variables.
+//
+static bool hasRestrictedSegment(const macho_header* mh)
+{
+ const uint32_t cmd_count = mh->ncmds;
+ const struct load_command* const cmds = (struct load_command*)(((char*)mh)+sizeof(macho_header));
+ const struct load_command* cmd = cmds;
+ for (uint32_t i = 0; i < cmd_count; ++i) {
+ switch (cmd->cmd) {
+ case LC_SEGMENT_COMMAND:
+ {
+ const struct macho_segment_command* seg = (struct macho_segment_command*)cmd;
+
+ //dyld::log("seg name: %s\n", seg->segname);
+ if (strcmp(seg->segname, "__RESTRICT") == 0) {
+ const struct macho_section* const sectionsStart = (struct macho_section*)((char*)seg + sizeof(struct macho_segment_command));
+ const struct macho_section* const sectionsEnd = §ionsStart[seg->nsects];
+ for (const struct macho_section* sect=sectionsStart; sect < sectionsEnd; ++sect) {
+ if (strcmp(sect->sectname, "__restrict") == 0)
+ return true;
+ }
+ }
+ }
+ break;
+ }
+ cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
+ }
+
+ return false;
+}
+
+#if SUPPORT_VERSIONED_PATHS
+//
+// Peeks at a dylib file and returns its current_version and install_name.
+// Returns false on error.
+//
+static bool getDylibVersionAndInstallname(const char* dylibPath, uint32_t* version, char* installName)
+{
+ // open file (automagically closed when this function exits)
+ FileOpener file(dylibPath);
+
+ if ( file.getFileDescriptor() == -1 )
+ return false;
+
+ uint8_t firstPage[4096];
+ if ( pread(file.getFileDescriptor(), firstPage, 4096, 0) != 4096 )
+ return false;
+
+ // if fat wrapper, find usable sub-file
+ const fat_header* fileStartAsFat = (fat_header*)firstPage;
+ if ( fileStartAsFat->magic == OSSwapBigToHostInt32(FAT_MAGIC) ) {
+ uint64_t fileOffset;
+ uint64_t fileLength;
+ if ( fatFindBest(fileStartAsFat, &fileOffset, &fileLength) ) {
+ if ( pread(file.getFileDescriptor(), firstPage, 4096, fileOffset) != 4096 )
+ return false;
+ }
+ else {
+ return false;
+ }
+ }
+
+ // check mach-o header
+ const mach_header* mh = (mach_header*)firstPage;
+ if ( mh->magic != sMainExecutableMachHeader->magic )
+ return false;
+ if ( mh->cputype != sMainExecutableMachHeader->cputype )
+ return false;
+
+ // scan load commands for LC_ID_DYLIB
+ const uint32_t cmd_count = mh->ncmds;
+ const struct load_command* const cmds = (struct load_command*)(((char*)mh)+sizeof(macho_header));
+ const struct load_command* const cmdsReadEnd = (struct load_command*)(((char*)mh)+4096);
+ const struct load_command* cmd = cmds;
+ for (uint32_t i = 0; i < cmd_count; ++i) {
+ switch (cmd->cmd) {
+ case LC_ID_DYLIB:
+ {
+ const struct dylib_command* id = (struct dylib_command*)cmd;
+ *version = id->dylib.current_version;
+ if ( installName != NULL )
+ strlcpy(installName, (char *)id + id->dylib.name.offset, PATH_MAX);
+ return true;
+ }
+ break;
+ }
+ cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
+ if ( cmd > cmdsReadEnd )
+ return false;
+ }
+
+ return false;
+}
+#endif // SUPPORT_VERSIONED_PATHS
+
+#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, dlopen-count=%d, never-unload=%d, in-use=%d, name=%s\n",
+ imageState, image->dlopenCount(), image->neverUnload(), image->isMarkedInUse(), image->getShortName());
+ }
+}
+#endif
+
+void link(ImageLoader* image, bool forceLazysBound, bool neverUnload, 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);
+
+ // process images
+ try {
+ image->link(gLinkContext, forceLazysBound, false, neverUnload, loaderRPaths);
+ }
+ catch (const char* msg) {
+ garbageCollectImages();
+ throw;
+ }
+}
+
+
+void runInitializers(ImageLoader* image)
+{
+ // do bottom up initialization
+ ImageLoader::InitializerTimingList initializerTimes[sAllImages.size()];
+ initializerTimes[0].count = 0;
+ image->runInitializers(gLinkContext, initializerTimes[0]);
+}
+
+// This function is called at the end of dlclose() when the reference count goes to zero.
+// The dylib being unloaded may have brought in other dependent dylibs when it was loaded.
+// Those dependent dylibs need to be unloaded, but only if they are not referenced by
+// something else. We use a standard mark and sweep garbage collection.
+//
+// The tricky part is that when a dylib is unloaded it may have a termination function that
+// can run and itself call dlclose() on yet another dylib. The problem is that this
+// sort of gabage collection is not re-entrant. Instead a terminator's call to dlclose()
+// which calls garbageCollectImages() will just set a flag to re-do the garbage collection
+// when the current pass is done.
+//
+// Also note that this is done within the dyld global lock, so it is always single threaded.
+//
+void garbageCollectImages()
+{
+ static bool sDoingGC = false;
+ static bool sRedo = false;
+
+ if ( sDoingGC ) {
+ // GC is currently being run, just set a flag to have it run again.
+ sRedo = true;
+ return;
+ }
+
+ sDoingGC = true;
+ do {
+ sRedo = false;
+
+ // mark phase: mark all images not-in-use
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ ImageLoader* image = *it;
+ //dyld::log("gc: neverUnload=%d name=%s\n", image->neverUnload(), image->getShortName());
+ image->markNotUsed();
+ }
+
+ // sweep phase: mark as in-use, images reachable from never-unload or in-use image
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ ImageLoader* image = *it;
+ if ( (image->dlopenCount() != 0) || image->neverUnload() ) {
+ image->markedUsedRecursive(sDynamicReferences);
+ }
+ }
+
+ // collect phase: build array of images not marked in-use
+ ImageLoader* deadImages[sAllImages.size()];
+ unsigned deadCount = 0;
+ unsigned i = 0;
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ ImageLoader* image = *it;
+ if ( ! image->isMarkedInUse() ) {
+ deadImages[i++] = image;
+ if (gLogAPIs) dyld::log("dlclose(), found unused image %p %s\n", image, image->getShortName());
+ ++deadCount;
+ }
+ }
+
+ // collect phase: run termination routines for images not marked in-use
+ // TO DO: When libc has cxa_finalize() that takes array of images, pass deadImages[] instead of the for loop here
+ for (unsigned i=0; i < deadCount; ++i) {
+ ImageLoader* image = deadImages[i];
+ try {
+ if (gLogAPIs) dyld::log("dlclose(), running terminators for %p %s\n", image, image->getShortName());
+ runImageTerminators(image);
+ }
+ catch (const char* msg) {
+ dyld::warn("problem running terminators for image: %s\n", msg);
+ }
+ }
+
+ // collect phase: delete all images which are not marked in-use
+ bool mightBeMore;
+ do {
+ mightBeMore = false;
+ for (std::vector<ImageLoader*>::iterator it=sAllImages.begin(); it != sAllImages.end(); it++) {
+ ImageLoader* image = *it;
+ if ( ! image->isMarkedInUse() ) {
+ try {
+ if (gLogAPIs) dyld::log("dlclose(), deleting %p %s\n", image, image->getShortName());
+ removeImage(image);
+ ImageLoader::deleteImage(image);
+ mightBeMore = true;
+ break; // interator in invalidated by this removal
+ }
+ catch (const char* msg) {
+ dyld::warn("problem deleting image: %s\n", msg);
+ }
+ }
+ }
+ } while ( mightBeMore );
+ } while (sRedo);
+ sDoingGC = false;
+
+ //printAllImages();
+
+}
+
+
+static void preflight_finally(ImageLoader* image)
+{
+ if ( image->isBundle() ) {
+ removeImageFromAllImages(image->machHeader());
+ ImageLoader::deleteImage(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, false, 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.useFallbackPaths = false;
+ context.useLdLibraryPath = false;
+ context.implicitRPath = false;
+ context.matchByInstallName = false;
+ context.dontLoad = false;
+ context.mustBeBundle = false;
+ context.mustBeDylib = true;
+ context.canBePIE = false;
+ context.origin = NULL; // can't use @loader_path with DYLD_INSERT_LIBRARIES
+ context.rpath = NULL;
+ image = load(path, context);
+ }
+ catch (const char* msg) {
+ halt(dyld::mkstringf("could not load inserted library '%s' because %s\n", path, msg));
+ }
+ catch (...) {
+ halt(dyld::mkstringf("could not load inserted library '%s'\n", path));
+ }
+}
+
+static bool processRestricted(const macho_header* mainExecutableMH)
+{
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
+ // ask kernel if code signature of program makes it restricted
+ uint32_t flags;
+ if ( csops(0, CS_OPS_STATUS, &flags, sizeof(flags)) != -1 ) {
+ if ( flags & CS_ENFORCEMENT ) {
+ gLinkContext.codeSigningEnforced = true;
+ }
+ }
+ if (flags & CS_RESTRICT) {
+ sRestrictedReason = restrictedByEntitlements;
+ return true;
+ }
+#else
+ gLinkContext.codeSigningEnforced = true;
+#endif
+
+ // all processes with setuid or setgid bit set are restricted
+ if ( issetugid() ) {
+ sRestrictedReason = restrictedBySetGUid;
+ return true;
+ }
+
+ // <rdar://problem/13158444&13245742> Respect __RESTRICT,__restrict section for root processes
+ if ( hasRestrictedSegment(mainExecutableMH) ) {
+ // existence of __RESTRICT/__restrict section make process restricted
+ sRestrictedReason = restrictedBySegment;
+ return true;
+ }
+ return false;
+}
+
+
+bool processIsRestricted()
+{
+ return sProcessIsRestricted;
+}
+
+
+// <rdar://problem/10583252> Add dyld to uuidArray to enable symbolication of stackshots
+static void addDyldImageToUUIDList()
+{
+ const struct macho_header* mh = (macho_header*)&__dso_handle;
+ const uint32_t cmd_count = mh->ncmds;
+ const struct load_command* const cmds = (struct load_command*)((char*)mh + sizeof(macho_header));
+ const struct load_command* cmd = cmds;
+ for (uint32_t i = 0; i < cmd_count; ++i) {
+ switch (cmd->cmd) {
+ case LC_UUID: {
+ uuid_command* uc = (uuid_command*)cmd;
+ dyld_uuid_info info;
+ info.imageLoadAddress = (mach_header*)mh;
+ memcpy(info.imageUUID, uc->uuid, 16);
+ addNonSharedCacheImageUUID(info);
+ return;
+ }
+ }
+ cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
+ }
+}
+
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
+typedef int (*open_proc_t)(const char*, int, int);
+typedef int (*fcntl_proc_t)(int, int, void*);
+typedef int (*ioctl_proc_t)(int, unsigned long, void*);
+static void* getProcessInfo() { return dyld::gProcessInfo; }
+static SyscallHelpers sSysCalls = {
+ 1,
+ (open_proc_t)&open,
+ &close,
+ &pread,
+ &write,
+ &mmap,
+ &munmap,
+ &madvise,
+ &stat,
+ (fcntl_proc_t)&fcntl,
+ (ioctl_proc_t)&ioctl,
+ &issetugid,
+ &getcwd,
+ &realpath,
+ &vm_allocate,
+ &vm_deallocate,
+ &vm_protect,
+ &vlog,
+ &vwarn,
+ &pthread_mutex_lock,
+ &pthread_mutex_unlock,
+ &mach_thread_self,
+ &mach_port_deallocate,
+ &task_self_trap,
+ &mach_timebase_info,
+ &OSAtomicCompareAndSwapPtrBarrier,
+ &OSMemoryBarrier,
+ &getProcessInfo,
+ &__error,
+ &mach_absolute_time
+};
+
+__attribute__((noinline))
+static uintptr_t useSimulatorDyld(int fd, const macho_header* mainExecutableMH, const char* dyldPath,
+ int argc, const char* argv[], const char* envp[], const char* apple[], uintptr_t* startGlue)
+{
+ *startGlue = 0;
+
+ // verify simulator dyld file is owned by root
+ struct stat sb;
+ if ( fstat(fd, &sb) == -1 )
+ return 0;
+ if ( sb.st_uid != 0 )
+ return 0;
+
+ // read first page of dyld file
+ uint8_t firstPage[4096];
+ if ( pread(fd, firstPage, 4096, 0) != 4096 )
+ return 0;
+
+ // if fat file, pick matching slice
+ uint64_t fileOffset = 0;
+ uint64_t fileLength = sb.st_size;
+ const fat_header* fileStartAsFat = (fat_header*)firstPage;
+ if ( fileStartAsFat->magic == OSSwapBigToHostInt32(FAT_MAGIC) ) {
+ if ( !fatFindBest(fileStartAsFat, &fileOffset, &fileLength) )
+ return 0;
+ // re-read buffer from start of mach-o slice in fat file
+ if ( pread(fd, firstPage, 4096, fileOffset) != 4096 )
+ return 0;
+ }
+ else if ( !isCompatibleMachO(firstPage, dyldPath) ) {
+ return 0;
+ }
+
+ // calculate total size of dyld segments
+ const macho_header* mh = (const macho_header*)firstPage;
+ uintptr_t mappingSize = 0;
+ uintptr_t preferredLoadAddress = 0;
+ const uint32_t cmd_count = mh->ncmds;
+ const struct load_command* const cmds = (struct load_command*)(((char*)mh)+sizeof(macho_header));
+ const struct load_command* cmd = cmds;
+ for (uint32_t i = 0; i < cmd_count; ++i) {
+ switch (cmd->cmd) {
+ case LC_SEGMENT_COMMAND:
+ {
+ struct macho_segment_command* seg = (struct macho_segment_command*)cmd;
+ mappingSize += seg->vmsize;
+ if ( seg->fileoff == 0 )
+ preferredLoadAddress = seg->vmaddr;
+ }
+ break;
+ }
+ cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
+ }
+
+ // reserve space, then mmap each segment
+ vm_address_t loadAddress = 0;
+ uintptr_t entry = 0;
+ if ( ::vm_allocate(mach_task_self(), &loadAddress, mappingSize, VM_FLAGS_ANYWHERE) != 0 )
+ return 0;
+ cmd = cmds;
+ struct linkedit_data_command* codeSigCmd = NULL;
+ for (uint32_t i = 0; i < cmd_count; ++i) {
+ switch (cmd->cmd) {
+ case LC_SEGMENT_COMMAND:
+ {
+ struct macho_segment_command* seg = (struct macho_segment_command*)cmd;
+ uintptr_t requestedLoadAddress = seg->vmaddr - preferredLoadAddress + loadAddress;
+ void* segAddress = ::mmap((void*)requestedLoadAddress, seg->filesize, seg->initprot, MAP_FIXED | MAP_PRIVATE, fd, fileOffset + seg->fileoff);
+ //dyld::log("dyld_sim %s mapped at %p\n", seg->segname, segAddress);
+ if ( segAddress == (void*)(-1) )
+ return 0;
+ }
+ break;
+ case LC_UNIXTHREAD:
+ {
+ #if __i386__
+ const i386_thread_state_t* registers = (i386_thread_state_t*)(((char*)cmd) + 16);
+ entry = (registers->__eip + loadAddress - preferredLoadAddress);
+ #elif __x86_64__
+ const x86_thread_state64_t* registers = (x86_thread_state64_t*)(((char*)cmd) + 16);
+ entry = (registers->__rip + loadAddress - preferredLoadAddress);
+ #endif
+ }
+ break;
+ case LC_CODE_SIGNATURE:
+ codeSigCmd = (struct linkedit_data_command*)cmd;
+ break;
+ }
+ cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
+ }
+
+ if ( codeSigCmd != NULL ) {
+ fsignatures_t siginfo;
+ siginfo.fs_file_start=fileOffset; // start of mach-o slice in fat file
+ siginfo.fs_blob_start=(void*)(long)(codeSigCmd->dataoff); // start of code-signature in mach-o file
+ siginfo.fs_blob_size=codeSigCmd->datasize; // size of code-signature
+ int result = fcntl(fd, F_ADDFILESIGS, &siginfo);
+ if ( result == -1 ) {
+ if ( (errno == EPERM) || (errno == EBADEXEC) )
+ return 0;
+ }
+ }
+ close(fd);
+
+ // notify debugger that dyld_sim is loaded
+ dyld_image_info info;
+ info.imageLoadAddress = (mach_header*)loadAddress;
+ info.imageFilePath = strdup(dyldPath);
+ info.imageFileModDate = sb.st_mtime;
+ addImagesToAllImages(1, &info);
+ dyld::gProcessInfo->notification(dyld_image_adding, 1, &info);
+
+ // jump into new simulator dyld
+ typedef uintptr_t (*sim_entry_proc_t)(int argc, const char* argv[], const char* envp[], const char* apple[],
+ const macho_header* mainExecutableMH, const macho_header* dyldMH, uintptr_t dyldSlide,
+ const dyld::SyscallHelpers* vtable, uintptr_t* startGlue);
+ sim_entry_proc_t newDyld = (sim_entry_proc_t)entry;
+ return (*newDyld)(argc, argv, envp, apple, mainExecutableMH, (macho_header*)loadAddress,
+ loadAddress - preferredLoadAddress,
+ &sSysCalls, startGlue);
+}
+#endif
+
+
+//
+// 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 macho_header* mainExecutableMH, uintptr_t mainExecutableSlide,
+ int argc, const char* argv[], const char* envp[], const char* apple[],
+ uintptr_t* startGlue)
+{
+ uintptr_t result = 0;
+ sMainExecutableMachHeader = mainExecutableMH;
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
+ // if this is host dyld, check to see if iOS simulator is being run
+ const char* rootPath = _simple_getenv(envp, "DYLD_ROOT_PATH");
+ if ( rootPath != NULL ) {
+ // look to see if simulator has its own dyld
+ char simDyldPath[PATH_MAX];
+ strlcpy(simDyldPath, rootPath, PATH_MAX);
+ strlcat(simDyldPath, "/usr/lib/dyld_sim", PATH_MAX);
+ int fd = my_open(simDyldPath, O_RDONLY, 0);
+ if ( fd != -1 ) {
+ result = useSimulatorDyld(fd, mainExecutableMH, simDyldPath, argc, argv, envp, apple, startGlue);
+ if ( !result && (*startGlue == 0) )
+ halt("problem loading iOS simulator dyld");
+ return result;
+ }
+ }
+#endif
+
+ CRSetCrashLogMessage("dyld: launch started");
+#ifdef ALTERNATIVE_LOGFILE
+ sLogfile = open(ALTERNATIVE_LOGFILE, O_WRONLY | O_CREAT | O_APPEND);
+ if ( sLogfile == -1 ) {
+ sLogfile = STDERR_FILENO;
+ dyld::log("error opening alternate log file %s, errno = %d\n", ALTERNATIVE_LOGFILE, errno);
+ }
+#endif
+
+#if LOG_BINDINGS
+ char bindingsLogPath[256];
+
+ const char* shortProgName = "unknown";
+ if ( argc > 0 ) {
+ shortProgName = strrchr(argv[0], '/');
+ if ( shortProgName == NULL )
+ shortProgName = argv[0];
+ else
+ ++shortProgName;
+ }
+ mysprintf(bindingsLogPath, "/tmp/bindings/%d-%s", getpid(), shortProgName);
+ sBindingsLogfile = open(bindingsLogPath, O_WRONLY | O_CREAT, 0666);
+ if ( sBindingsLogfile == -1 ) {
+ ::mkdir("/tmp/bindings", 0777);
+ sBindingsLogfile = open(bindingsLogPath, O_WRONLY | O_CREAT, 0666);
+ }
+ //dyld::log("open(%s) => %d, errno = %d\n", bindingsLogPath, sBindingsLogfile, errno);
+#endif
+ setContext(mainExecutableMH, argc, argv, envp, apple);
+
+ // Pickup the pointer to the exec path.
+ sExecPath = _simple_getenv(apple, "executable_path");
+
+ // <rdar://problem/13868260> Remove interim apple[0] transition code from dyld
+ if (!sExecPath) sExecPath = apple[0];
+
+ sExecPath = apple[0];
+ bool ignoreEnvironmentVariables = false;
+ 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;
+ }
+ }
+ // Remember short name of process for later logging
+ sExecShortName = ::strrchr(sExecPath, '/');
+ if ( sExecShortName != NULL )
+ ++sExecShortName;
+ else
+ sExecShortName = sExecPath;
+ sProcessIsRestricted = processRestricted(mainExecutableMH);
+ if ( sProcessIsRestricted ) {
+#if SUPPORT_LC_DYLD_ENVIRONMENT
+ checkLoadCommandEnvironmentVariables();
+#if SUPPORT_VERSIONED_PATHS
+ checkVersionedPaths();
+#endif
+#endif
+ pruneEnvironmentVariables(envp, &apple);
+ // set again because envp and apple may have changed or moved
+ setContext(mainExecutableMH, argc, argv, 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);
+ stateToHandlers(dyld_image_state_mapped, sSingleHandlers)->push_back(updateAllImages);
+ // make initial allocations large enough that it is unlikely to need to be re-alloced
+ sAllImages.reserve(INITIAL_IMAGE_COUNT);
+ sImageRoots.reserve(16);
+ sAddImageCallbacks.reserve(4);
+ sRemoveImageCallbacks.reserve(4);
+ sImageFilesNeedingTermination.reserve(16);
+ sImageFilesNeedingDOFUnregistration.reserve(8);
+
+#ifdef WAIT_FOR_SYSTEM_ORDER_HANDSHAKE
+ // <rdar://problem/6849505> Add gating mechanism to dyld support system order file generation process
+ WAIT_FOR_SYSTEM_ORDER_HANDSHAKE(dyld::gProcessInfo->systemOrderFlag);
+#endif
+
+
+ try {
+ // add dyld itself to UUID list
+ addDyldImageToUUIDList();
+ if ( sProcessIsRestricted )
+ CRSetCrashLogMessage("dyld: launch, loading dependent libraries, ignoring DYLD_* env vars");
+ else
+ CRSetCrashLogMessage("dyld: launch, loading dependent libraries");
+ // instantiate ImageLoader for main executable
+ sMainExecutable = instantiateFromLoadedImage(mainExecutableMH, mainExecutableSlide, sExecPath);
+ gLinkContext.mainExecutable = sMainExecutable;
+ gLinkContext.processIsRestricted = sProcessIsRestricted;
+ gLinkContext.mainExecutableCodeSigned = hasCodeSignatureLoadCommand(mainExecutableMH);
+ // 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, true, ImageLoader::RPathChain(NULL, NULL));
+ sMainExecutable->setNeverUnloadRecursive();
+ if ( sMainExecutable->forceFlat() ) {
+ gLinkContext.bindFlat = true;
+ gLinkContext.prebindUsage = ImageLoader::kUseNoPrebinding;
+ }
+
+ // 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, true, ImageLoader::RPathChain(NULL, NULL));
+ image->setNeverUnloadRecursive();
+ // only INSERTED libraries can interpose
+ image->registerInterposing();
+ }
+ }
+ // apply interposing to initial set of images
+ for(int i=0; i < sImageRoots.size(); ++i) {
+ sImageRoots[i]->applyInterposing(gLinkContext);
+ }
+ gLinkContext.linkingMainExecutable = false;
+
+ // <rdar://problem/12186933> do weak binding only after all inserted images linked
+ sMainExecutable->weakBind(gLinkContext);
+
+ CRSetCrashLogMessage("dyld: launch, running initializers");
+ #if SUPPORT_OLD_CRT_INITIALIZATION
+ // Old way is to run initializers via a callback from crt1.o
+ if ( ! gRunInitializersOldWay )
+ initializeMainExecutable();
+ #else
+ // run all initializers
+ initializeMainExecutable();
+ #endif
+ // find entry point for main executable
+ result = (uintptr_t)sMainExecutable->getThreadPC();
+ if ( result != 0 ) {
+ // main executable uses LC_MAIN, needs to return to glue in libdyld.dylib
+ if ( (gLibSystemHelpers != NULL) && (gLibSystemHelpers->version >= 9) )
+ *startGlue = (uintptr_t)gLibSystemHelpers->startGlueToCallExit;
+ else
+ halt("libdyld.dylib support not present for LC_MAIN");
+ }
+ else {
+ // main executable uses LC_UNIXTHREAD, dyld needs to let "start" in program set up for main()
+ result = (uintptr_t)sMainExecutable->getMain();
+ *startGlue = 0;
+ }
+ }
+ catch(const char* message) {
+ syncAllImages();
+ halt(message);
+ }
+ catch(...) {
+ dyld::log("dyld: launch failed\n");
+ }
+
+#ifdef ALTERNATIVE_LOGFILE
+ // only use alternate log during launch, otherwise file is open forever
+ if ( sLogfile != STDERR_FILENO ) {
+ close(sLogfile);
+ sLogfile = STDERR_FILENO;
+ }
+#endif
+ CRSetCrashLogMessage(NULL);
+
+ return result;
+}
+
+
+
+} // namespace
+
+
+