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+++ dyld/dyld-732.8/src/ImageLoaderMachOCompressed.cpp
@@ -0,0 +1,2080 @@
+/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
+ *
+ * Copyright (c) 2008 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@
+ */
+
+
+#if __arm__ || __arm64__
+ #include <System/sys/mman.h>
+#else
+ #include <sys/mman.h>
+#endif
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/fcntl.h>
+#include <sys/stat.h>
+#include <sys/param.h>
+#include <mach/mach.h>
+#include <mach/thread_status.h>
+#include <mach-o/loader.h>
+#include <mach-o/dyld_images.h>
+
+#include "dyld2.h"
+#include "ImageLoaderMachOCompressed.h"
+#include "Closure.h"
+#include "Array.h"
+
+#ifndef BIND_SUBOPCODE_THREADED_SET_JOP
+ #define BIND_SUBOPCODE_THREADED_SET_JOP 0x0F
+#endif
+
+// relocation_info.r_length field has value 3 for 64-bit executables and value 2 for 32-bit executables
+#if __LP64__
+ #define RELOC_SIZE 3
+ #define LC_SEGMENT_COMMAND LC_SEGMENT_64
+ #define LC_ROUTINES_COMMAND LC_ROUTINES_64
+ struct macho_segment_command : public segment_command_64 {};
+ struct macho_section : public section_64 {};
+ struct macho_routines_command : public routines_command_64 {};
+#else
+ #define RELOC_SIZE 2
+ #define LC_SEGMENT_COMMAND LC_SEGMENT
+ #define LC_ROUTINES_COMMAND LC_ROUTINES
+ struct macho_segment_command : public segment_command {};
+ struct macho_section : public section {};
+ struct macho_routines_command : public routines_command {};
+#endif
+
+
+
+// create image for main executable
+ImageLoaderMachOCompressed* ImageLoaderMachOCompressed::instantiateMainExecutable(const macho_header* mh, uintptr_t slide, const char* path,
+ unsigned int segCount, unsigned int libCount, const LinkContext& context)
+{
+ ImageLoaderMachOCompressed* image = ImageLoaderMachOCompressed::instantiateStart(mh, path, segCount, libCount);
+
+ // set slide for PIE programs
+ image->setSlide(slide);
+
+ // for PIE record end of program, to know where to start loading dylibs
+ if ( slide != 0 )
+ fgNextPIEDylibAddress = (uintptr_t)image->getEnd();
+
+ image->disableCoverageCheck();
+ image->instantiateFinish(context);
+ image->setMapped(context);
+
+ if ( context.verboseMapping ) {
+ dyld::log("dyld: Main executable mapped %s\n", path);
+ for(unsigned int i=0, e=image->segmentCount(); i < e; ++i) {
+ const char* name = image->segName(i);
+ if ( (strcmp(name, "__PAGEZERO") == 0) || (strcmp(name, "__UNIXSTACK") == 0) )
+ dyld::log("%18s at 0x%08lX->0x%08lX\n", name, image->segPreferredLoadAddress(i), image->segPreferredLoadAddress(i)+image->segSize(i));
+ else
+ dyld::log("%18s at 0x%08lX->0x%08lX\n", name, image->segActualLoadAddress(i), image->segActualEndAddress(i));
+ }
+ }
+
+ return image;
+}
+
+// create image by mapping in a mach-o file
+ImageLoaderMachOCompressed* ImageLoaderMachOCompressed::instantiateFromFile(const char* path, int fd, const uint8_t* fileData, size_t lenFileData,
+ uint64_t offsetInFat, uint64_t lenInFat, const struct stat& info,
+ unsigned int segCount, unsigned int libCount,
+ const struct linkedit_data_command* codeSigCmd,
+ const struct encryption_info_command* encryptCmd,
+ const LinkContext& context)
+{
+ ImageLoaderMachOCompressed* image = ImageLoaderMachOCompressed::instantiateStart((macho_header*)fileData, path, segCount, libCount);
+
+ try {
+ // record info about file
+ image->setFileInfo(info.st_dev, info.st_ino, info.st_mtime);
+
+ // if this image is code signed, let kernel validate signature before mapping any pages from image
+ image->loadCodeSignature(codeSigCmd, fd, offsetInFat, context);
+
+ // Validate that first data we read with pread actually matches with code signature
+ image->validateFirstPages(codeSigCmd, fd, fileData, lenFileData, offsetInFat, context);
+
+ // mmap segments
+ image->mapSegments(fd, offsetInFat, lenInFat, info.st_size, context);
+
+ // if framework is FairPlay encrypted, register with kernel
+ image->registerEncryption(encryptCmd, context);
+
+ // probe to see if code signed correctly
+ image->crashIfInvalidCodeSignature();
+
+ // finish construction
+ image->instantiateFinish(context);
+
+ // if path happens to be same as in LC_DYLIB_ID load command use that, otherwise malloc a copy of the path
+ const char* installName = image->getInstallPath();
+ if ( (installName != NULL) && (strcmp(installName, path) == 0) && (path[0] == '/') )
+ image->setPathUnowned(installName);
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
+ // <rdar://problem/6563887> app crashes when libSystem cannot be found
+ else if ( (installName != NULL) && (strcmp(path, "/usr/lib/libgcc_s.1.dylib") == 0) && (strcmp(installName, "/usr/lib/libSystem.B.dylib") == 0) )
+ image->setPathUnowned("/usr/lib/libSystem.B.dylib");
+#endif
+ else if ( (path[0] != '/') || (strstr(path, "../") != NULL) ) {
+ // rdar://problem/10733082 Fix up @rpath based paths during introspection
+ // rdar://problem/5135363 turn relative paths into absolute paths so gdb, Symbolication can later find them
+ char realPath[MAXPATHLEN];
+ if ( fcntl(fd, F_GETPATH, realPath) == 0 )
+ image->setPaths(path, realPath);
+ else
+ image->setPath(path);
+ }
+ else {
+ // <rdar://problem/46682306> always try to realpath dylibs since they may have been dlopen()ed using a symlink path
+ if ( installName != NULL ) {
+ char realPath[MAXPATHLEN];
+ if ( (fcntl(fd, F_GETPATH, realPath) == 0) && (strcmp(path, realPath) != 0) )
+ image->setPaths(path, realPath);
+ else
+ image->setPath(path);
+ }
+ else {
+ image->setPath(path);
+ }
+ }
+
+ // make sure path is stable before recording in dyld_all_image_infos
+ image->setMapped(context);
+
+ }
+ catch (...) {
+ // ImageLoader::setMapped() can throw an exception to block loading of image
+ // <rdar://problem/6169686> Leaked fSegmentsArray and image segments during failed dlopen_preflight
+ delete image;
+ throw;
+ }
+
+ return image;
+}
+
+// create image by using cached mach-o file
+ImageLoaderMachOCompressed* ImageLoaderMachOCompressed::instantiateFromCache(const macho_header* mh, const char* path, long slide,
+ const struct stat& info, unsigned int segCount,
+ unsigned int libCount, const LinkContext& context)
+{
+ ImageLoaderMachOCompressed* image = ImageLoaderMachOCompressed::instantiateStart(mh, path, segCount, libCount);
+ try {
+ // record info about file
+ image->setFileInfo(info.st_dev, info.st_ino, info.st_mtime);
+
+ // remember this is from shared cache and cannot be unloaded
+ image->fInSharedCache = true;
+ image->setNeverUnload();
+ image->setSlide(slide);
+ image->disableCoverageCheck();
+
+ // segments already mapped in cache
+ if ( context.verboseMapping ) {
+ dyld::log("dyld: Using shared cached for %s\n", path);
+ for(unsigned int i=0; i < image->fSegmentsCount; ++i) {
+ dyld::log("%18s at 0x%08lX->0x%08lX\n", image->segName(i), image->segActualLoadAddress(i), image->segActualEndAddress(i));
+ }
+ }
+
+ image->instantiateFinish(context);
+
+#if TARGET_OS_SIMULATOR
+ char realPath[MAXPATHLEN] = { 0 };
+ if ( dyld::gLinkContext.rootPaths == NULL )
+ throw "root path is not set";
+ strlcpy(realPath, dyld::gLinkContext.rootPaths[0], MAXPATHLEN);
+ strlcat(realPath, path, MAXPATHLEN);
+ image->setPaths(path, realPath);
+#endif
+ image->setMapped(context);
+ }
+ catch (...) {
+ // ImageLoader::setMapped() can throw an exception to block loading of image
+ // <rdar://problem/6169686> Leaked fSegmentsArray and image segments during failed dlopen_preflight
+ delete image;
+ throw;
+ }
+
+ return image;
+}
+
+// create image by copying an in-memory mach-o file
+ImageLoaderMachOCompressed* ImageLoaderMachOCompressed::instantiateFromMemory(const char* moduleName, const macho_header* mh, uint64_t len,
+ unsigned int segCount, unsigned int libCount, const LinkContext& context)
+{
+ ImageLoaderMachOCompressed* image = ImageLoaderMachOCompressed::instantiateStart(mh, moduleName, segCount, libCount);
+ try {
+ // map segments
+ if ( mh->filetype == MH_EXECUTE )
+ throw "can't load another MH_EXECUTE";
+
+ // vmcopy segments
+ image->mapSegments((const void*)mh, len, context);
+
+ // for compatibility, never unload dylibs loaded from memory
+ image->setNeverUnload();
+
+ image->disableCoverageCheck();
+
+ // bundle loads need path copied
+ if ( moduleName != NULL )
+ image->setPath(moduleName);
+
+ image->instantiateFinish(context);
+ image->setMapped(context);
+ }
+ catch (...) {
+ // ImageLoader::setMapped() can throw an exception to block loading of image
+ // <rdar://problem/6169686> Leaked fSegmentsArray and image segments during failed dlopen_preflight
+ delete image;
+ throw;
+ }
+
+ return image;
+}
+
+
+ImageLoaderMachOCompressed::ImageLoaderMachOCompressed(const macho_header* mh, const char* path, unsigned int segCount,
+ uint32_t segOffsets[], unsigned int libCount)
+ : ImageLoaderMachO(mh, path, segCount, segOffsets, libCount), fDyldInfo(NULL), fChainedFixups(NULL), fExportsTrie(NULL)
+{
+}
+
+ImageLoaderMachOCompressed::~ImageLoaderMachOCompressed()
+{
+ // don't do clean up in ~ImageLoaderMachO() because virtual call to segmentCommandOffsets() won't work
+ destroy();
+}
+
+
+
+// construct ImageLoaderMachOCompressed using "placement new" with SegmentMachO objects array at end
+ImageLoaderMachOCompressed* ImageLoaderMachOCompressed::instantiateStart(const macho_header* mh, const char* path,
+ unsigned int segCount, unsigned int libCount)
+{
+ size_t size = sizeof(ImageLoaderMachOCompressed) + segCount * sizeof(uint32_t) + libCount * sizeof(ImageLoader*);
+ ImageLoaderMachOCompressed* allocatedSpace = static_cast<ImageLoaderMachOCompressed*>(malloc(size));
+ if ( allocatedSpace == NULL )
+ throw "malloc failed";
+ uint32_t* segOffsets = ((uint32_t*)(((uint8_t*)allocatedSpace) + sizeof(ImageLoaderMachOCompressed)));
+ bzero(&segOffsets[segCount], libCount*sizeof(void*)); // zero out lib array
+ return new (allocatedSpace) ImageLoaderMachOCompressed(mh, path, segCount, segOffsets, libCount);
+}
+
+
+// common code to finish initializing object
+void ImageLoaderMachOCompressed::instantiateFinish(const LinkContext& context)
+{
+ // now that segments are mapped in, get real fMachOData, fLinkEditBase, and fSlide
+ this->parseLoadCmds(context);
+}
+
+uint32_t* ImageLoaderMachOCompressed::segmentCommandOffsets() const
+{
+ return ((uint32_t*)(((uint8_t*)this) + sizeof(ImageLoaderMachOCompressed)));
+}
+
+
+ImageLoader* ImageLoaderMachOCompressed::libImage(unsigned int libIndex) const
+{
+ const uintptr_t* images = ((uintptr_t*)(((uint8_t*)this) + sizeof(ImageLoaderMachOCompressed) + fSegmentsCount*sizeof(uint32_t)));
+ // mask off low bits
+ return (ImageLoader*)(images[libIndex] & (-4));
+}
+
+bool ImageLoaderMachOCompressed::libReExported(unsigned int libIndex) const
+{
+ const uintptr_t* images = ((uintptr_t*)(((uint8_t*)this) + sizeof(ImageLoaderMachOCompressed) + fSegmentsCount*sizeof(uint32_t)));
+ // re-export flag is low bit
+ return ((images[libIndex] & 1) != 0);
+}
+
+bool ImageLoaderMachOCompressed::libIsUpward(unsigned int libIndex) const
+{
+ const uintptr_t* images = ((uintptr_t*)(((uint8_t*)this) + sizeof(ImageLoaderMachOCompressed) + fSegmentsCount*sizeof(uint32_t)));
+ // re-export flag is second bit
+ return ((images[libIndex] & 2) != 0);
+}
+
+
+void ImageLoaderMachOCompressed::setLibImage(unsigned int libIndex, ImageLoader* image, bool reExported, bool upward)
+{
+ uintptr_t* images = ((uintptr_t*)(((uint8_t*)this) + sizeof(ImageLoaderMachOCompressed) + fSegmentsCount*sizeof(uint32_t)));
+ uintptr_t value = (uintptr_t)image;
+ if ( reExported )
+ value |= 1;
+ if ( upward )
+ value |= 2;
+ images[libIndex] = value;
+}
+
+
+void ImageLoaderMachOCompressed::rebaseAt(const LinkContext& context, uintptr_t addr, uintptr_t slide, uint8_t type)
+{
+ if ( context.verboseRebase ) {
+ dyld::log("dyld: rebase: %s:*0x%08lX += 0x%08lX\n", this->getShortName(), (uintptr_t)addr, slide);
+ }
+ //dyld::log("0x%08lX type=%d\n", addr, type);
+ uintptr_t* locationToFix = (uintptr_t*)addr;
+ switch (type) {
+ case REBASE_TYPE_POINTER:
+ *locationToFix += slide;
+ break;
+ case REBASE_TYPE_TEXT_ABSOLUTE32:
+ *locationToFix += slide;
+ break;
+ default:
+ dyld::throwf("bad rebase type %d", type);
+ }
+}
+
+void ImageLoaderMachOCompressed::throwBadRebaseAddress(uintptr_t address, uintptr_t segmentEndAddress, int segmentIndex,
+ const uint8_t* startOpcodes, const uint8_t* endOpcodes, const uint8_t* pos)
+{
+ dyld::throwf("malformed rebase opcodes (%ld/%ld): address 0x%08lX is outside of segment %s (0x%08lX -> 0x%08lX)",
+ (intptr_t)(pos-startOpcodes), (intptr_t)(endOpcodes-startOpcodes), address, segName(segmentIndex),
+ segActualLoadAddress(segmentIndex), segmentEndAddress);
+}
+
+void ImageLoaderMachOCompressed::rebase(const LinkContext& context, uintptr_t slide)
+{
+ // binary uses chained fixups where are applied during binding
+ if ( fDyldInfo == NULL )
+ return;
+
+ CRSetCrashLogMessage2(this->getPath());
+ const uint8_t* const start = fLinkEditBase + fDyldInfo->rebase_off;
+ const uint8_t* const end = &start[fDyldInfo->rebase_size];
+ const uint8_t* p = start;
+
+ if ( start == end )
+ return;
+
+ uint32_t ignore;
+ bool bindingBecauseOfRoot = this->overridesCachedDylib(ignore);
+ vmAccountingSetSuspended(context, bindingBecauseOfRoot);
+
+ try {
+ uint8_t type = 0;
+ int segmentIndex = 0;
+ uintptr_t address = segActualLoadAddress(0);
+ uintptr_t segmentStartAddress = segActualLoadAddress(0);
+ uintptr_t segmentEndAddress = segActualEndAddress(0);
+ uintptr_t count;
+ uintptr_t skip;
+ bool done = false;
+ while ( !done && (p < end) ) {
+ uint8_t immediate = *p & REBASE_IMMEDIATE_MASK;
+ uint8_t opcode = *p & REBASE_OPCODE_MASK;
+ ++p;
+ switch (opcode) {
+ case REBASE_OPCODE_DONE:
+ done = true;
+ break;
+ case REBASE_OPCODE_SET_TYPE_IMM:
+ type = immediate;
+ break;
+ case REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
+ segmentIndex = immediate;
+ if ( segmentIndex >= fSegmentsCount )
+ dyld::throwf("REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has segment %d which is too large (0..%d)",
+ segmentIndex, fSegmentsCount-1);
+ #if TEXT_RELOC_SUPPORT
+ if ( !segWriteable(segmentIndex) && !segHasRebaseFixUps(segmentIndex) && !segHasBindFixUps(segmentIndex) )
+ #else
+ if ( !segWriteable(segmentIndex) )
+ #endif
+ dyld::throwf("REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has segment %d which is not a writable segment (%s)",
+ segmentIndex, segName(segmentIndex));
+ segmentStartAddress = segActualLoadAddress(segmentIndex);
+ segmentEndAddress = segActualEndAddress(segmentIndex);
+ address = segmentStartAddress + read_uleb128(p, end);
+ break;
+ case REBASE_OPCODE_ADD_ADDR_ULEB:
+ address += read_uleb128(p, end);
+ break;
+ case REBASE_OPCODE_ADD_ADDR_IMM_SCALED:
+ address += immediate*sizeof(uintptr_t);
+ break;
+ case REBASE_OPCODE_DO_REBASE_IMM_TIMES:
+ for (int i=0; i < immediate; ++i) {
+ if ( (address < segmentStartAddress) || (address >= segmentEndAddress) )
+ throwBadRebaseAddress(address, segmentEndAddress, segmentIndex, start, end, p);
+ rebaseAt(context, address, slide, type);
+ address += sizeof(uintptr_t);
+ }
+ fgTotalRebaseFixups += immediate;
+ break;
+ case REBASE_OPCODE_DO_REBASE_ULEB_TIMES:
+ count = read_uleb128(p, end);
+ for (uint32_t i=0; i < count; ++i) {
+ if ( (address < segmentStartAddress) || (address >= segmentEndAddress) )
+ throwBadRebaseAddress(address, segmentEndAddress, segmentIndex, start, end, p);
+ rebaseAt(context, address, slide, type);
+ address += sizeof(uintptr_t);
+ }
+ fgTotalRebaseFixups += count;
+ break;
+ case REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB:
+ if ( (address < segmentStartAddress) || (address >= segmentEndAddress) )
+ throwBadRebaseAddress(address, segmentEndAddress, segmentIndex, start, end, p);
+ rebaseAt(context, address, slide, type);
+ address += read_uleb128(p, end) + sizeof(uintptr_t);
+ ++fgTotalRebaseFixups;
+ break;
+ case REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB:
+ count = read_uleb128(p, end);
+ skip = read_uleb128(p, end);
+ for (uint32_t i=0; i < count; ++i) {
+ if ( (address < segmentStartAddress) || (address >= segmentEndAddress) )
+ throwBadRebaseAddress(address, segmentEndAddress, segmentIndex, start, end, p);
+ rebaseAt(context, address, slide, type);
+ address += skip + sizeof(uintptr_t);
+ }
+ fgTotalRebaseFixups += count;
+ break;
+ default:
+ dyld::throwf("bad rebase opcode %d", *(p-1));
+ }
+ }
+ }
+ catch (const char* msg) {
+ const char* newMsg = dyld::mkstringf("%s in %s", msg, this->getPath());
+ free((void*)msg);
+ throw newMsg;
+ }
+ CRSetCrashLogMessage2(NULL);
+}
+
+const ImageLoader::Symbol* ImageLoaderMachOCompressed::findShallowExportedSymbol(const char* symbol, const ImageLoader** foundIn) const
+{
+ //dyld::log("Compressed::findExportedSymbol(%s) in %s\n", symbol, this->getShortName());
+ uint32_t trieFileOffset = fDyldInfo ? fDyldInfo->export_off : fExportsTrie->dataoff;
+ uint32_t trieFileSize = fDyldInfo ? fDyldInfo->export_size : fExportsTrie->datasize;
+ if ( trieFileSize == 0 )
+ return NULL;
+#if LOG_BINDINGS
+ dyld::logBindings("%s: %s\n", this->getShortName(), symbol);
+#endif
+ ++ImageLoaderMachO::fgSymbolTrieSearchs;
+ const uint8_t* start = &fLinkEditBase[trieFileOffset];
+ const uint8_t* end = &start[trieFileSize];
+ const uint8_t* foundNodeStart = this->trieWalk(start, end, symbol);
+ if ( foundNodeStart != NULL ) {
+ const uint8_t* p = foundNodeStart;
+ const uintptr_t flags = read_uleb128(p, end);
+ // found match, return pointer to terminal part of node
+ if ( flags & EXPORT_SYMBOL_FLAGS_REEXPORT ) {
+ // re-export from another dylib, lookup there
+ const uintptr_t ordinal = read_uleb128(p, end);
+ const char* importedName = (char*)p;
+ if ( importedName[0] == '\0' )
+ importedName = symbol;
+ if ( (ordinal > 0) && (ordinal <= libraryCount()) ) {
+ const ImageLoader* reexportedFrom = libImage((unsigned int)ordinal-1);
+ // Missing weak-dylib
+ if ( reexportedFrom == NULL )
+ return NULL;
+ //dyld::log("Compressed::findExportedSymbol(), %s -> %s/%s\n", symbol, reexportedFrom->getShortName(), importedName);
+ const char* reExportLibPath = libPath((unsigned int)ordinal-1);
+ return reexportedFrom->findExportedSymbol(importedName, true, reExportLibPath, foundIn);
+ }
+ else {
+ //dyld::throwf("bad mach-o binary, library ordinal (%u) invalid (max %u) for re-exported symbol %s in %s",
+ // ordinal, libraryCount(), symbol, this->getPath());
+ }
+ }
+ else {
+ //dyld::log("findExportedSymbol(%s) in %s found match, returning %p\n", symbol, this->getShortName(), p);
+ if ( foundIn != NULL )
+ *foundIn = (ImageLoader*)this;
+ // return pointer to terminal part of node
+ return (Symbol*)foundNodeStart;
+ }
+ }
+ return NULL;
+}
+
+
+bool ImageLoaderMachOCompressed::containsSymbol(const void* addr) const
+{
+ uint32_t trieFileOffset = fDyldInfo ? fDyldInfo->export_off : fExportsTrie->dataoff;
+ uint32_t trieFileSize = fDyldInfo ? fDyldInfo->export_size : fExportsTrie->datasize;
+ const uint8_t* start = &fLinkEditBase[trieFileOffset];
+ const uint8_t* end = &start[trieFileSize];
+ return ( (start <= addr) && (addr < end) );
+}
+
+
+uintptr_t ImageLoaderMachOCompressed::exportedSymbolAddress(const LinkContext& context, const Symbol* symbol, const ImageLoader* requestor, bool runResolver) const
+{
+ uint32_t trieFileOffset = fDyldInfo ? fDyldInfo->export_off : fExportsTrie->dataoff;
+ uint32_t trieFileSize = fDyldInfo ? fDyldInfo->export_size : fExportsTrie->datasize;
+ const uint8_t* exportNode = (uint8_t*)symbol;
+ const uint8_t* exportTrieStart = fLinkEditBase + trieFileOffset;
+ const uint8_t* exportTrieEnd = exportTrieStart + trieFileSize;
+ if ( (exportNode < exportTrieStart) || (exportNode > exportTrieEnd) )
+ throw "symbol is not in trie";
+ //dyld::log("exportedSymbolAddress(): node=%p, nodeOffset=0x%04X in %s\n", symbol, (int)((uint8_t*)symbol - exportTrieStart), this->getShortName());
+ uintptr_t flags = read_uleb128(exportNode, exportTrieEnd);
+ switch ( flags & EXPORT_SYMBOL_FLAGS_KIND_MASK ) {
+ case EXPORT_SYMBOL_FLAGS_KIND_REGULAR:
+ if ( runResolver && (flags & EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER) ) {
+ // this node has a stub and resolver, run the resolver to get target address
+ uintptr_t stub = read_uleb128(exportNode, exportTrieEnd) + (uintptr_t)fMachOData; // skip over stub
+ // <rdar://problem/10657737> interposing dylibs have the stub address as their replacee
+ uintptr_t interposedStub = interposedAddress(context, stub, requestor);
+ if ( interposedStub != stub )
+ return interposedStub;
+ // stub was not interposed, so run resolver
+ typedef uintptr_t (*ResolverProc)(void);
+ ResolverProc resolver = (ResolverProc)(read_uleb128(exportNode, exportTrieEnd) + (uintptr_t)fMachOData);
+#if __has_feature(ptrauth_calls)
+ resolver = (ResolverProc)__builtin_ptrauth_sign_unauthenticated(resolver, ptrauth_key_asia, 0);
+#endif
+ uintptr_t result = (*resolver)();
+ if ( context.verboseBind )
+ dyld::log("dyld: resolver at %p returned 0x%08lX\n", resolver, result);
+#if __has_feature(ptrauth_calls)
+ result = (uintptr_t)__builtin_ptrauth_strip((void*)result, ptrauth_key_asia);
+#endif
+ return result;
+ }
+ return read_uleb128(exportNode, exportTrieEnd) + (uintptr_t)fMachOData;
+ case EXPORT_SYMBOL_FLAGS_KIND_THREAD_LOCAL:
+ if ( flags & EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER )
+ dyld::throwf("unsupported exported symbol kind. flags=%lu at node=%p", flags, symbol);
+ return read_uleb128(exportNode, exportTrieEnd) + (uintptr_t)fMachOData;
+ case EXPORT_SYMBOL_FLAGS_KIND_ABSOLUTE:
+ if ( flags & EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER )
+ dyld::throwf("unsupported exported symbol kind. flags=%lu at node=%p", flags, symbol);
+ return read_uleb128(exportNode, exportTrieEnd);
+ default:
+ dyld::throwf("unsupported exported symbol kind. flags=%lu at node=%p", flags, symbol);
+ }
+}
+
+bool ImageLoaderMachOCompressed::exportedSymbolIsWeakDefintion(const Symbol* symbol) const
+{
+ uint32_t trieFileOffset = fDyldInfo ? fDyldInfo->export_off : fExportsTrie->dataoff;
+ uint32_t trieFileSize = fDyldInfo ? fDyldInfo->export_size : fExportsTrie->datasize;
+ const uint8_t* exportNode = (uint8_t*)symbol;
+ const uint8_t* exportTrieStart = fLinkEditBase + trieFileOffset;
+ const uint8_t* exportTrieEnd = exportTrieStart + trieFileSize;
+ if ( (exportNode < exportTrieStart) || (exportNode > exportTrieEnd) )
+ throw "symbol is not in trie";
+ uintptr_t flags = read_uleb128(exportNode, exportTrieEnd);
+ return ( flags & EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION );
+}
+
+
+const char* ImageLoaderMachOCompressed::exportedSymbolName(const Symbol* symbol) const
+{
+ throw "NSNameOfSymbol() not supported with compressed LINKEDIT";
+}
+
+unsigned int ImageLoaderMachOCompressed::exportedSymbolCount() const
+{
+ throw "NSSymbolDefinitionCountInObjectFileImage() not supported with compressed LINKEDIT";
+}
+
+const ImageLoader::Symbol* ImageLoaderMachOCompressed::exportedSymbolIndexed(unsigned int index) const
+{
+ throw "NSSymbolDefinitionNameInObjectFileImage() not supported with compressed LINKEDIT";
+}
+
+unsigned int ImageLoaderMachOCompressed::importedSymbolCount() const
+{
+ throw "NSSymbolReferenceCountInObjectFileImage() not supported with compressed LINKEDIT";
+}
+
+const ImageLoader::Symbol* ImageLoaderMachOCompressed::importedSymbolIndexed(unsigned int index) const
+{
+ throw "NSSymbolReferenceCountInObjectFileImage() not supported with compressed LINKEDIT";
+}
+
+const char* ImageLoaderMachOCompressed::importedSymbolName(const Symbol* symbol) const
+{
+ throw "NSSymbolReferenceNameInObjectFileImage() not supported with compressed LINKEDIT";
+}
+
+
+
+uintptr_t ImageLoaderMachOCompressed::resolveFlat(const LinkContext& context, const char* symbolName, bool weak_import,
+ bool runResolver, const ImageLoader** foundIn)
+{
+ const Symbol* sym;
+ if ( context.flatExportFinder(symbolName, &sym, foundIn) ) {
+ if ( *foundIn != this )
+ context.addDynamicReference(this, const_cast<ImageLoader*>(*foundIn));
+ return (*foundIn)->getExportedSymbolAddress(sym, context, this, runResolver);
+ }
+ // if a bundle is loaded privately the above will not find its exports
+ if ( this->isBundle() && this->hasHiddenExports() ) {
+ // look in self for needed symbol
+ sym = this->findShallowExportedSymbol(symbolName, foundIn);
+ if ( sym != NULL )
+ return (*foundIn)->getExportedSymbolAddress(sym, context, this, runResolver);
+ }
+ if ( weak_import ) {
+ // definition can't be found anywhere, ok because it is weak, just return 0
+ return 0;
+ }
+ throwSymbolNotFound(context, symbolName, this->getPath(), "", "flat namespace");
+}
+
+
+static void patchCacheUsesOf(const ImageLoader::LinkContext& context, const dyld3::closure::Image* overriddenImage,
+ uint32_t cacheOffsetOfImpl, const char* symbolName, uintptr_t newImpl)
+{
+ uintptr_t cacheStart = (uintptr_t)context.dyldCache;
+ uint32_t imageIndex = overriddenImage->imageNum() - (uint32_t)context.dyldCache->cachedDylibsImageArray()->startImageNum();
+ context.dyldCache->forEachPatchableUseOfExport(imageIndex, cacheOffsetOfImpl, ^(dyld_cache_patchable_location patchLocation) {
+ uintptr_t* loc = (uintptr_t*)(cacheStart+patchLocation.cacheOffset);
+#if __has_feature(ptrauth_calls)
+ if ( patchLocation.authenticated ) {
+ dyld3::MachOLoaded::ChainedFixupPointerOnDisk fixupInfo;
+ fixupInfo.arm64e.authRebase.auth = true;
+ fixupInfo.arm64e.authRebase.addrDiv = patchLocation.usesAddressDiversity;
+ fixupInfo.arm64e.authRebase.diversity = patchLocation.discriminator;
+ fixupInfo.arm64e.authRebase.key = patchLocation.key;
+ uintptr_t newValue = fixupInfo.arm64e.signPointer(loc, newImpl + DyldSharedCache::getAddend(patchLocation));
+ if ( *loc != newValue ) {
+ *loc = newValue;
+ if ( context.verboseBind )
+ dyld::log("dyld: cache fixup: *%p = %p (JOP: diversity 0x%04X, addr-div=%d, key=%s) to %s\n",
+ loc, (void*)newValue, patchLocation.discriminator, patchLocation.usesAddressDiversity, DyldSharedCache::keyName(patchLocation), symbolName);
+ }
+ return;
+ }
+#endif
+ uintptr_t newValue = newImpl + (uintptr_t)DyldSharedCache::getAddend(patchLocation);
+ if ( *loc != newValue ) {
+ *loc = newValue;
+ if ( context.verboseBind )
+ dyld::log("dyld: cache fixup: *%p = %p to %s\n", loc, (void*)newValue, symbolName);
+ }
+ });
+}
+
+
+
+uintptr_t ImageLoaderMachOCompressed::resolveWeak(const LinkContext& context, const char* symbolName, bool weak_import,
+ bool runResolver, const ImageLoader** foundIn)
+{
+ const Symbol* sym;
+ CoalesceNotifier notifier = nullptr;
+ __block uintptr_t foundOutsideCache = 0;
+ __block const char* foundOutsideCachePath = nullptr;
+ __block uintptr_t lastFoundInCache = 0;
+ if ( this->usesChainedFixups() ) {
+ notifier = ^(const Symbol* implSym, const ImageLoader* implIn, const mach_header* implMh) {
+ // This block is only called in dyld2 mode when a non-cached image is search for which weak-def implementation to use
+ // As a side effect of that search we notice any implementations outside and inside the cache,
+ // and use that to trigger patching the cache to use the implementation outside the cache.
+ uintptr_t implAddr = implIn->getExportedSymbolAddress(implSym, context, nullptr, false, symbolName);
+ if ( ((dyld3::MachOLoaded*)implMh)->inDyldCache() ) {
+ if ( foundOutsideCache != 0 ) {
+ // have an implementation in cache and and earlier one not in the cache, patch cache to use earlier one
+ lastFoundInCache = implAddr;
+ uint32_t imageIndex;
+ if ( context.dyldCache->findMachHeaderImageIndex(implMh, imageIndex) ) {
+ const dyld3::closure::Image* overriddenImage = context.dyldCache->cachedDylibsImageArray()->imageForNum(imageIndex+1);
+ uint32_t cacheOffsetOfImpl = (uint32_t)((uintptr_t)implAddr - (uintptr_t)context.dyldCache);
+ if ( context.verboseWeakBind )
+ dyld::log("dyld: weak bind, patching dyld cache uses of %s to use 0x%lX in %s\n", symbolName, foundOutsideCache, foundOutsideCachePath);
+ patchCacheUsesOf(context, overriddenImage, cacheOffsetOfImpl, symbolName, foundOutsideCache);
+ }
+ }
+ }
+ else {
+ // record first non-cache implementation
+ if ( foundOutsideCache == 0 ) {
+ foundOutsideCache = implAddr;
+ foundOutsideCachePath = implIn->getPath();
+ }
+ }
+ };
+ }
+
+ if ( context.coalescedExportFinder(symbolName, &sym, foundIn, notifier) ) {
+ if ( *foundIn != this )
+ context.addDynamicReference(this, const_cast<ImageLoader*>(*foundIn));
+ return (*foundIn)->getExportedSymbolAddress(sym, context, this, runResolver);
+ }
+ // if a bundle is loaded privately the above will not find its exports
+ if ( this->isBundle() && this->hasHiddenExports() ) {
+ // look in self for needed symbol
+ sym = this->findShallowExportedSymbol(symbolName, foundIn);
+ if ( sym != NULL )
+ return (*foundIn)->getExportedSymbolAddress(sym, context, this, runResolver);
+ }
+ if ( weak_import ) {
+ // definition can't be found anywhere, ok because it is weak, just return 0
+ return 0;
+ }
+ throwSymbolNotFound(context, symbolName, this->getPath(), "", "weak");
+}
+
+
+uintptr_t ImageLoaderMachOCompressed::resolveTwolevel(const LinkContext& context, const char* symbolName, const ImageLoader* definedInImage,
+ const ImageLoader* requestorImage, unsigned requestorOrdinalOfDef, bool weak_import, bool runResolver,
+ const ImageLoader** foundIn)
+{
+ // two level lookup
+ uintptr_t address;
+ if ( definedInImage->findExportedSymbolAddress(context, symbolName, requestorImage, requestorOrdinalOfDef, runResolver, foundIn, &address) )
+ return address;
+
+ if ( weak_import ) {
+ // definition can't be found anywhere, ok because it is weak, just return 0
+ return 0;
+ }
+
+ // nowhere to be found, check if maybe this image is too new for this OS
+ char versMismatch[256];
+ versMismatch[0] = '\0';
+ uint32_t imageMinOS = this->minOSVersion();
+ // dyld is always built for the current OS, so we can get the current OS version
+ // from the load command in dyld itself.
+ extern const mach_header __dso_handle;
+ uint32_t dyldMinOS = ImageLoaderMachO::minOSVersion(&__dso_handle);
+ if ( imageMinOS > dyldMinOS ) {
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
+ const char* msg = dyld::mkstringf(" (which was built for Mac OS X %d.%d)", imageMinOS >> 16, (imageMinOS >> 8) & 0xFF);
+#else
+ const char* msg = dyld::mkstringf(" (which was built for iOS %d.%d)", imageMinOS >> 16, (imageMinOS >> 8) & 0xFF);
+#endif
+ strcpy(versMismatch, msg);
+ ::free((void*)msg);
+ }
+ throwSymbolNotFound(context, symbolName, this->getPath(), versMismatch, definedInImage->getPath());
+}
+
+
+uintptr_t ImageLoaderMachOCompressed::resolve(const LinkContext& context, const char* symbolName,
+ uint8_t symboFlags, long libraryOrdinal, const ImageLoader** targetImage,
+ LastLookup* last, bool runResolver)
+{
+ *targetImage = NULL;
+
+ // only clients that benefit from caching last lookup pass in a LastLookup struct
+ if ( last != NULL ) {
+ if ( (last->ordinal == libraryOrdinal)
+ && (last->flags == symboFlags)
+ && (last->name == symbolName) ) {
+ *targetImage = last->foundIn;
+ return last->result;
+ }
+ }
+
+ bool weak_import = (symboFlags & BIND_SYMBOL_FLAGS_WEAK_IMPORT);
+ uintptr_t symbolAddress;
+ if ( context.bindFlat || (libraryOrdinal == BIND_SPECIAL_DYLIB_FLAT_LOOKUP) ) {
+ symbolAddress = this->resolveFlat(context, symbolName, weak_import, runResolver, targetImage);
+ }
+ else if ( libraryOrdinal == BIND_SPECIAL_DYLIB_WEAK_LOOKUP ) {
+ symbolAddress = this->resolveWeak(context, symbolName, false, runResolver, targetImage);
+ }
+ else {
+ if ( libraryOrdinal == BIND_SPECIAL_DYLIB_MAIN_EXECUTABLE ) {
+ *targetImage = context.mainExecutable;
+ }
+ else if ( libraryOrdinal == BIND_SPECIAL_DYLIB_SELF ) {
+ *targetImage = this;
+ }
+ else if ( libraryOrdinal <= 0 ) {
+ dyld::throwf("bad mach-o binary, unknown special library ordinal (%ld) too big for symbol %s in %s",
+ libraryOrdinal, symbolName, this->getPath());
+ }
+ else if ( (unsigned)libraryOrdinal <= libraryCount() ) {
+ *targetImage = libImage((unsigned int)libraryOrdinal-1);
+ }
+ else {
+ dyld::throwf("bad mach-o binary, library ordinal (%ld) too big (max %u) for symbol %s in %s",
+ libraryOrdinal, libraryCount(), symbolName, this->getPath());
+ }
+ if ( *targetImage == NULL ) {
+ if ( weak_import ) {
+ // if target library not loaded and reference is weak or library is weak return 0
+ symbolAddress = 0;
+ }
+ else {
+ dyld::throwf("can't resolve symbol %s in %s because dependent dylib #%ld could not be loaded",
+ symbolName, this->getPath(), libraryOrdinal);
+ }
+ }
+ else {
+ symbolAddress = resolveTwolevel(context, symbolName, *targetImage, this, (unsigned)libraryOrdinal, weak_import, runResolver, targetImage);
+ }
+ }
+
+ // save off lookup results if client wants
+ if ( last != NULL ) {
+ last->ordinal = libraryOrdinal;
+ last->flags = symboFlags;
+ last->name = symbolName;
+ last->foundIn = *targetImage;
+ last->result = symbolAddress;
+ }
+
+ return symbolAddress;
+}
+
+uintptr_t ImageLoaderMachOCompressed::bindAt(const LinkContext& context, ImageLoaderMachOCompressed* image,
+ uintptr_t addr, uint8_t type, const char* symbolName,
+ uint8_t symbolFlags, intptr_t addend, long libraryOrdinal,
+ ExtraBindData *extraBindData,
+ const char* msg, LastLookup* last, bool runResolver)
+{
+ const ImageLoader* targetImage;
+ uintptr_t symbolAddress;
+
+ // resolve symbol
+ if (type == BIND_TYPE_THREADED_REBASE) {
+ symbolAddress = 0;
+ targetImage = nullptr;
+ } else
+ symbolAddress = image->resolve(context, symbolName, symbolFlags, libraryOrdinal, &targetImage, last, runResolver);
+
+ // do actual update
+ return image->bindLocation(context, image->imageBaseAddress(), addr, symbolAddress, type, symbolName, addend, image->getPath(), targetImage ? targetImage->getPath() : NULL, msg, extraBindData, image->fSlide);
+}
+
+
+void ImageLoaderMachOCompressed::throwBadBindingAddress(uintptr_t address, uintptr_t segmentEndAddress, int segmentIndex,
+ const uint8_t* startOpcodes, const uint8_t* endOpcodes, const uint8_t* pos)
+{
+ dyld::throwf("malformed binding opcodes (%ld/%ld): address 0x%08lX is outside segment %s (0x%08lX -> 0x%08lX)",
+ (intptr_t)(pos-startOpcodes), (intptr_t)(endOpcodes-startOpcodes), address, segName(segmentIndex),
+ segActualLoadAddress(segmentIndex), segmentEndAddress);
+}
+
+
+void ImageLoaderMachOCompressed::doBind(const LinkContext& context, bool forceLazysBound)
+{
+ CRSetCrashLogMessage2(this->getPath());
+
+ // if prebound and loaded at prebound address, and all libraries are same as when this was prebound, then no need to bind
+ // note: flat-namespace binaries need to have imports rebound (even if correctly prebound)
+ if ( this->usablePrebinding(context) ) {
+ // don't need to bind
+ // except weak which may now be inline with the regular binds
+ if (this->participatesInCoalescing()) {
+ // run through all binding opcodes
+ eachBind(context, ^(const LinkContext& ctx, ImageLoaderMachOCompressed* image,
+ uintptr_t addr, uint8_t type, const char* symbolName,
+ uint8_t symbolFlags, intptr_t addend, long libraryOrdinal,
+ ExtraBindData *extraBindData,
+ const char* msg, LastLookup* last, bool runResolver) {
+ if ( libraryOrdinal != BIND_SPECIAL_DYLIB_WEAK_LOOKUP )
+ return (uintptr_t)0;
+ return ImageLoaderMachOCompressed::bindAt(ctx, image, addr, type, symbolName, symbolFlags,
+ addend, libraryOrdinal, extraBindData,
+ msg, last, runResolver);
+ });
+ }
+ }
+ else {
+ uint64_t t0 = mach_absolute_time();
+
+ uint32_t ignore;
+ bool bindingBecauseOfRoot = ( this->overridesCachedDylib(ignore) || this->inSharedCache() );
+ vmAccountingSetSuspended(context, bindingBecauseOfRoot);
+
+ if ( fChainedFixups != NULL ) {
+ const dyld_chained_fixups_header* fixupsHeader = (dyld_chained_fixups_header*)(fLinkEditBase + fChainedFixups->dataoff);
+ doApplyFixups(context, fixupsHeader);
+ }
+ else {
+ #if TEXT_RELOC_SUPPORT
+ // if there are __TEXT fixups, temporarily make __TEXT writable
+ if ( fTextSegmentBinds )
+ this->makeTextSegmentWritable(context, true);
+ #endif
+
+ // run through all binding opcodes
+ eachBind(context, ^(const LinkContext& ctx, ImageLoaderMachOCompressed* image,
+ uintptr_t addr, uint8_t type, const char* symbolName,
+ uint8_t symbolFlags, intptr_t addend, long libraryOrdinal,
+ ExtraBindData *extraBindData,
+ const char* msg, LastLookup* last, bool runResolver) {
+ return ImageLoaderMachOCompressed::bindAt(ctx, image, addr, type, symbolName, symbolFlags,
+ addend, libraryOrdinal, extraBindData,
+ msg, last, runResolver);
+ });
+
+ #if TEXT_RELOC_SUPPORT
+ // if there were __TEXT fixups, restore write protection
+ if ( fTextSegmentBinds )
+ this->makeTextSegmentWritable(context, false);
+ #endif
+
+ // if this image is in the shared cache, but depends on something no longer in the shared cache,
+ // there is no way to reset the lazy pointers, so force bind them now
+ if ( forceLazysBound || fInSharedCache )
+ this->doBindJustLazies(context);
+
+ // this image is in cache, but something below it is not. If
+ // this image has lazy pointer to a resolver function, then
+ // the stub may have been altered to point to a shared lazy pointer.
+ if ( fInSharedCache )
+ this->updateOptimizedLazyPointers(context);
+ }
+
+ uint64_t t1 = mach_absolute_time();
+ ImageLoader::fgTotalRebindCacheTime += (t1-t0);
+ }
+
+ // See if this dylib overrides something in the dyld cache
+ uint32_t dyldCacheOverrideImageNum;
+ if ( context.dyldCache && context.dyldCache->header.builtFromChainedFixups && overridesCachedDylib(dyldCacheOverrideImageNum) ) {
+ // need to patch all other places in cache that point to the overridden dylib, to point to this dylib instead
+ const dyld3::closure::Image* overriddenImage = context.dyldCache->cachedDylibsImageArray()->imageForNum(dyldCacheOverrideImageNum);
+ uint32_t imageIndex = dyldCacheOverrideImageNum - (uint32_t)context.dyldCache->cachedDylibsImageArray()->startImageNum();
+ context.dyldCache->forEachPatchableExport(imageIndex, ^(uint32_t cacheOffsetOfImpl, const char* exportName) {
+ uintptr_t newImpl = 0;
+ const ImageLoader* foundIn;
+ this->findExportedSymbolAddress(context, exportName, NULL, 0, false, &foundIn, &newImpl);
+ patchCacheUsesOf(context, overriddenImage, cacheOffsetOfImpl, exportName, newImpl);
+ });
+ }
+
+ // set up dyld entry points in image
+ // do last so flat main executables will have __dyld or __program_vars set up
+ this->setupLazyPointerHandler(context);
+ CRSetCrashLogMessage2(NULL);
+}
+
+
+void ImageLoaderMachOCompressed::doBindJustLazies(const LinkContext& context)
+{
+ eachLazyBind(context, ^(const LinkContext& ctx, ImageLoaderMachOCompressed* image,
+ uintptr_t addr, uint8_t type, const char* symbolName,
+ uint8_t symbolFlags, intptr_t addend, long libraryOrdinal,
+ ExtraBindData *extraBindData,
+ const char* msg, LastLookup* last, bool runResolver) {
+ return ImageLoaderMachOCompressed::bindAt(ctx, image, addr, type, symbolName, symbolFlags,
+ addend, libraryOrdinal, extraBindData,
+ msg, last, runResolver);
+ });
+}
+
+void ImageLoaderMachOCompressed::doApplyFixups(const LinkContext& context, const dyld_chained_fixups_header* fixupsHeader)
+{
+ const dyld3::MachOLoaded* ml = (dyld3::MachOLoaded*)machHeader();
+ const dyld_chained_starts_in_image* starts = (dyld_chained_starts_in_image*)((uint8_t*)fixupsHeader + fixupsHeader->starts_offset);
+
+ // build table of resolved targets for each symbol ordinal
+ STACK_ALLOC_OVERFLOW_SAFE_ARRAY(const void*, targetAddrs, 128);
+ targetAddrs.reserve(fixupsHeader->imports_count);
+ Diagnostics diag;
+ const dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)ml;
+ ma->forEachChainedFixupTarget(diag, ^(int libOrdinal, const char* symbolName, uint64_t addend, bool weakImport, bool& stop) {
+ const ImageLoader* targetImage;
+ uint8_t symbolFlags = weakImport ? BIND_SYMBOL_FLAGS_WEAK_IMPORT : 0;
+ uintptr_t symbolAddress = this->resolve(context, symbolName, symbolFlags, libOrdinal, &targetImage, NULL, true);
+ targetAddrs.push_back((void*)(symbolAddress + addend));
+ });
+
+ auto logFixups = ^(void* loc, void* newValue) {
+ dyld::log("dyld: fixup: %s:%p = %p\n", this->getShortName(), loc, newValue);
+ };
+ if ( !context.verboseBind )
+ logFixups = nullptr;
+
+ ml->fixupAllChainedFixups(diag, starts, fSlide, targetAddrs, logFixups);
+}
+
+void ImageLoaderMachOCompressed::registerInterposing(const LinkContext& context)
+{
+ // mach-o files advertise interposing by having a __DATA __interpose section
+ struct InterposeData { uintptr_t replacement; uintptr_t replacee; };
+
+ __block Diagnostics diag;
+ const dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)fMachOData;
+ ma->forEachInterposingSection(diag, ^(uint64_t vmOffset, uint64_t vmSize, bool& stopSections) {
+ if ( ma->hasChainedFixups() ) {
+ const uint16_t pointerFormat = ma->chainedPointerFormat();
+ const uint8_t* sectionStart = fMachOData+vmOffset;
+ const uint8_t* sectionEnd = fMachOData+vmOffset+vmSize;
+ ma->withChainStarts(diag, ma->chainStartsOffset(), ^(const dyld_chained_starts_in_image* startsInfo) {
+ __block uintptr_t lastRebaseTarget = 0;
+ ma->forEachFixupInAllChains(diag, startsInfo, false, ^(dyld3::MachOLoaded::ChainedFixupPointerOnDisk* fixupLoc, const dyld_chained_starts_in_segment* segInfo, bool& stopFixups) {
+ if ( ((uint8_t*)fixupLoc < sectionStart) || ((uint8_t*)fixupLoc >= sectionEnd) )
+ return;
+ uint64_t rebaseTargetRuntimeOffset;
+ uint32_t bindOrdinal;
+ if ( fixupLoc->isRebase(pointerFormat, 0, rebaseTargetRuntimeOffset) ) {
+ //dyld::log("interpose rebase at fixup at %p to 0x%0llX\n", fixupLoc, rebaseTargetRuntimeOffset);
+ lastRebaseTarget = (uintptr_t)(fMachOData+rebaseTargetRuntimeOffset);
+ }
+ else if ( fixupLoc->isBind(pointerFormat, bindOrdinal) ) {
+ //dyld::log("interpose bind fixup at %p to bind ordinal %d\n", fixupLoc, bindOrdinal);
+ __block uint32_t targetBindIndex = 0;
+ ma->forEachChainedFixupTarget(diag, ^(int libraryOrdinal, const char* symbolName, uint64_t addend, bool weakImport, bool& stop) {
+ if ( targetBindIndex == bindOrdinal ) {
+ //dyld::log("interpose bind fixup at %p is to %s libOrdinal=%d\n", fixupLoc, symbolName, libraryOrdinal);
+ LastLookup* last = NULL;
+ const ImageLoader* targetImage;
+ uintptr_t targetBindAddress = 0;
+ try {
+ targetBindAddress = this->resolve(context, symbolName, 0, libraryOrdinal, &targetImage, last, false);
+ }
+ catch (const char* msg) {
+ if ( !weakImport )
+ throw msg;
+ targetBindAddress = 0;
+ }
+ //dyld::log("interpose bind fixup at %p is bound to 0x%lX\n", fixupLoc, targetBindAddress);
+ // <rdar://problem/25686570> ignore interposing on a weak function that does not exist
+ if ( targetBindAddress == 0 )
+ return;
+ ImageLoader::InterposeTuple tuple;
+ tuple.replacement = lastRebaseTarget;
+ tuple.neverImage = this;
+ tuple.onlyImage = NULL;
+ tuple.replacee = targetBindAddress;
+ // <rdar://problem/7937695> verify that replacement is in this image
+ if ( this->containsAddress((void*)tuple.replacement) ) {
+ if ( context.verboseInterposing )
+ dyld::log("dyld: interposing 0x%lx with 0x%lx\n", tuple.replacee, tuple.replacement);
+ // chain to any existing interpositions
+ for (std::vector<InterposeTuple>::iterator it=fgInterposingTuples.begin(); it != fgInterposingTuples.end(); it++) {
+ if ( it->replacee == tuple.replacee ) {
+ tuple.replacee = it->replacement;
+ }
+ }
+ ImageLoader::fgInterposingTuples.push_back(tuple);
+ }
+ }
+ ++targetBindIndex;
+ });
+ }
+ });
+ });
+ }
+ else {
+ // traditional (non-chained) fixups
+ const size_t count = (size_t)(vmSize / sizeof(InterposeData));
+ const InterposeData* interposeArray = (InterposeData*)(fMachOData+vmOffset);
+ if ( context.verboseInterposing )
+ dyld::log("dyld: found %lu interposing tuples in %s\n", count, getPath());
+ for (size_t j=0; j < count; ++j) {
+ uint64_t bindOffset = ((uint8_t*)&(interposeArray[j].replacee)) - fMachOData;
+ ma->forEachBind(diag, ^(uint64_t runtimeOffset, int libOrdinal, const char* symbolName, bool weakImport, bool lazyBind, uint64_t addend, bool& stopBinds) {
+ if ( bindOffset != runtimeOffset )
+ return;
+ stopBinds = true;
+ LastLookup* last = NULL;
+ const ImageLoader* targetImage;
+ uintptr_t targetBindAddress = 0;
+ try {
+ targetBindAddress = this->resolve(context, symbolName, 0, libOrdinal, &targetImage, last, false);
+ }
+ catch (const char* msg) {
+ if ( !weakImport )
+ throw msg;
+ targetBindAddress = 0;
+ }
+ ImageLoader::InterposeTuple tuple;
+ tuple.replacement = interposeArray[j].replacement;
+ tuple.neverImage = this;
+ tuple.onlyImage = NULL;
+ tuple.replacee = targetBindAddress;
+ // <rdar://problem/25686570> ignore interposing on a weak function that does not exist
+ if ( tuple.replacee == 0 )
+ return;
+ // <rdar://problem/7937695> verify that replacement is in this image
+ if ( this->containsAddress((void*)tuple.replacement) ) {
+ if ( context.verboseInterposing )
+ dyld::log("dyld: interposing 0x%lx with 0x%lx\n", tuple.replacee, tuple.replacement);
+ // chain to any existing interpositions
+ for (std::vector<InterposeTuple>::iterator it=fgInterposingTuples.begin(); it != fgInterposingTuples.end(); it++) {
+ if ( it->replacee == tuple.replacee ) {
+ tuple.replacee = it->replacement;
+ }
+ }
+ ImageLoader::fgInterposingTuples.push_back(tuple);
+ }
+ }, ^(const char* symbolName){ },
+ ^() { });
+ }
+ }
+ });
+}
+
+bool ImageLoaderMachOCompressed::usesChainedFixups() const
+{
+ return ((dyld3::MachOLoaded*)machHeader())->hasChainedFixups();
+}
+
+struct ThreadedBindData {
+ ThreadedBindData(const char* symbolName, int64_t addend, long libraryOrdinal, uint8_t symbolFlags, uint8_t type)
+ : symbolName(symbolName), addend(addend), libraryOrdinal(libraryOrdinal), symbolFlags(symbolFlags), type(type) { }
+
+ std::tuple<const char*, int64_t, long, bool, uint8_t> pack() const {
+ return std::make_tuple(symbolName, addend, libraryOrdinal, symbolFlags, type);
+ }
+
+ const char* symbolName = nullptr;
+ int64_t addend = 0;
+ long libraryOrdinal = 0;
+ uint8_t symbolFlags = 0;
+ uint8_t type = 0;
+};
+
+void ImageLoaderMachOCompressed::makeDataReadOnly() const
+{
+#if !TEXT_RELOC_SUPPORT
+ if ( fReadOnlyDataSegment && !this->ImageLoader::inSharedCache() ) {
+ for (unsigned int i=0; i < fSegmentsCount; ++i) {
+ if ( segIsReadOnlyData(i) ) {
+ uintptr_t start = segActualLoadAddress(i);
+ uintptr_t size = segSize(i);
+ ::mprotect((void*)start, size, PROT_READ);
+ //dyld::log("make read-only 0x%09lX -> 0x%09lX\n", (long)start, (long)(start+size));
+ }
+ }
+ }
+#endif
+}
+
+
+void ImageLoaderMachOCompressed::eachBind(const LinkContext& context, bind_handler handler)
+{
+ try {
+ uint8_t type = 0;
+ int segmentIndex = -1;
+ uintptr_t address = segActualLoadAddress(0);
+ uintptr_t segmentStartAddress = segActualLoadAddress(0);
+ uintptr_t segmentEndAddress = segActualEndAddress(0);
+ const char* symbolName = NULL;
+ uint8_t symboFlags = 0;
+ bool libraryOrdinalSet = false;
+ long libraryOrdinal = 0;
+ intptr_t addend = 0;
+ uintptr_t count;
+ uintptr_t skip;
+ uintptr_t segOffset = 0;
+
+ dyld3::OverflowSafeArray<ThreadedBindData> ordinalTable;
+ bool useThreadedRebaseBind = false;
+ ExtraBindData extraBindData;
+ LastLookup last = { 0, 0, NULL, 0, NULL };
+ const uint8_t* const start = fLinkEditBase + fDyldInfo->bind_off;
+ const uint8_t* const end = &start[fDyldInfo->bind_size];
+ const uint8_t* p = start;
+ bool done = false;
+ while ( !done && (p < end) ) {
+ uint8_t immediate = *p & BIND_IMMEDIATE_MASK;
+ uint8_t opcode = *p & BIND_OPCODE_MASK;
+ ++p;
+ switch (opcode) {
+ case BIND_OPCODE_DONE:
+ done = true;
+ break;
+ case BIND_OPCODE_SET_DYLIB_ORDINAL_IMM:
+ libraryOrdinal = immediate;
+ libraryOrdinalSet = true;
+ break;
+ case BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB:
+ libraryOrdinal = read_uleb128(p, end);
+ libraryOrdinalSet = true;
+ break;
+ case BIND_OPCODE_SET_DYLIB_SPECIAL_IMM:
+ // the special ordinals are negative numbers
+ if ( immediate == 0 )
+ libraryOrdinal = 0;
+ else {
+ int8_t signExtended = BIND_OPCODE_MASK | immediate;
+ libraryOrdinal = signExtended;
+ }
+ libraryOrdinalSet = true;
+ break;
+ case BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:
+ symbolName = (char*)p;
+ symboFlags = immediate;
+ while (*p != '\0')
+ ++p;
+ ++p;
+ break;
+ case BIND_OPCODE_SET_TYPE_IMM:
+ type = immediate;
+ break;
+ case BIND_OPCODE_SET_ADDEND_SLEB:
+ addend = read_sleb128(p, end);
+ break;
+ case BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
+ segmentIndex = immediate;
+ if ( (segmentIndex >= fSegmentsCount) || (segmentIndex < 0) )
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has segment %d which is out of range (0..%d)",
+ segmentIndex, fSegmentsCount-1);
+ #if TEXT_RELOC_SUPPORT
+ if ( !segWriteable(segmentIndex) && !segHasRebaseFixUps(segmentIndex) && !segHasBindFixUps(segmentIndex) )
+ #else
+ if ( !segWriteable(segmentIndex) )
+ #endif
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has segment %d which is not writable", segmentIndex);
+ segOffset = read_uleb128(p, end);
+ if ( segOffset > segSize(segmentIndex) )
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has offset 0x%08lX beyond segment size (0x%08lX)", segOffset, segSize(segmentIndex));
+ segmentStartAddress = segActualLoadAddress(segmentIndex);
+ address = segmentStartAddress + segOffset;
+ segmentEndAddress = segActualEndAddress(segmentIndex);
+ break;
+ case BIND_OPCODE_ADD_ADDR_ULEB:
+ address += read_uleb128(p, end);
+ break;
+ case BIND_OPCODE_DO_BIND:
+ if (!useThreadedRebaseBind) {
+ if ( (address < segmentStartAddress) || (address >= segmentEndAddress) )
+ throwBadBindingAddress(address, segmentEndAddress, segmentIndex, start, end, p);
+ if ( symbolName == NULL )
+ dyld::throwf("BIND_OPCODE_DO_BIND missing preceding BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM");
+ if ( segmentIndex == -1 )
+ dyld::throwf("BIND_OPCODE_DO_BIND missing preceding BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB");
+ if ( !libraryOrdinalSet )
+ dyld::throwf("BIND_OPCODE_DO_BIND missing preceding BIND_OPCODE_SET_DYLIB_ORDINAL*");
+ handler(context, this, address, type, symbolName, symboFlags, addend, libraryOrdinal,
+ &extraBindData, "", &last, false);
+ address += sizeof(intptr_t);
+ } else {
+ ordinalTable.push_back(ThreadedBindData(symbolName, addend, libraryOrdinal, symboFlags, type));
+ }
+ break;
+ case BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:
+ if ( (address < segmentStartAddress) || (address >= segmentEndAddress) )
+ throwBadBindingAddress(address, segmentEndAddress, segmentIndex, start, end, p);
+ if ( symbolName == NULL )
+ dyld::throwf("BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB missing preceding BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM");
+ if ( segmentIndex == -1 )
+ dyld::throwf("BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB missing preceding BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB");
+ if ( !libraryOrdinalSet )
+ dyld::throwf("BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB missing preceding BIND_OPCODE_SET_DYLIB_ORDINAL*");
+ handler(context, this, address, type, symbolName, symboFlags, addend, libraryOrdinal,
+ &extraBindData, "", &last, false);
+ address += read_uleb128(p, end) + sizeof(intptr_t);
+ break;
+ case BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED:
+ if ( (address < segmentStartAddress) || (address >= segmentEndAddress) )
+ throwBadBindingAddress(address, segmentEndAddress, segmentIndex, start, end, p);
+ if ( symbolName == NULL )
+ dyld::throwf("BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED missing preceding BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM");
+ if ( segmentIndex == -1 )
+ dyld::throwf("BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED missing preceding BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB");
+ if ( !libraryOrdinalSet )
+ dyld::throwf("BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED missing preceding BIND_OPCODE_SET_DYLIB_ORDINAL*");
+ handler(context, this, address, type, symbolName, symboFlags, addend, libraryOrdinal,
+ &extraBindData, "", &last, false);
+ address += immediate*sizeof(intptr_t) + sizeof(intptr_t);
+ break;
+ case BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:
+ if ( symbolName == NULL )
+ dyld::throwf("BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB missing preceding BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM");
+ if ( segmentIndex == -1 )
+ dyld::throwf("BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB missing preceding BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB");
+ count = read_uleb128(p, end);
+ if ( !libraryOrdinalSet )
+ dyld::throwf("BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB missing preceding BIND_OPCODE_SET_DYLIB_ORDINAL*");
+ skip = read_uleb128(p, end);
+ for (uint32_t i=0; i < count; ++i) {
+ if ( (address < segmentStartAddress) || (address >= segmentEndAddress) )
+ throwBadBindingAddress(address, segmentEndAddress, segmentIndex, start, end, p);
+ handler(context, this, address, type, symbolName, symboFlags, addend, libraryOrdinal,
+ &extraBindData, "", &last, false);
+ address += skip + sizeof(intptr_t);
+ }
+ break;
+ case BIND_OPCODE_THREADED:
+ if (sizeof(intptr_t) != 8) {
+ dyld::throwf("BIND_OPCODE_THREADED require 64-bit");
+ return;
+ }
+ // Note the immediate is a sub opcode
+ switch (immediate) {
+ case BIND_SUBOPCODE_THREADED_SET_BIND_ORDINAL_TABLE_SIZE_ULEB:
+ count = read_uleb128(p, end);
+ ordinalTable.clear();
+ // FIXME: ld64 wrote the wrong value here and we need to offset by 1 for now.
+ ordinalTable.reserve(count + 1);
+ useThreadedRebaseBind = true;
+ break;
+ case BIND_SUBOPCODE_THREADED_APPLY: {
+ uint64_t delta = 0;
+ do {
+ address = segmentStartAddress + segOffset;
+ uint64_t value = *(uint64_t*)address;
+
+
+ bool isRebase = (value & (1ULL << 62)) == 0;
+ if (isRebase) {
+ {
+ // Call the bind handler which knows about our bind type being set to rebase
+ handler(context, this, address, BIND_TYPE_THREADED_REBASE, nullptr, 0, 0, 0,
+ nullptr, "", &last, false);
+ }
+ } else {
+ // the ordinal is bits [0..15]
+ uint16_t ordinal = value & 0xFFFF;
+ if (ordinal >= ordinalTable.count()) {
+ dyld::throwf("bind ordinal (%d) is out of range (max=%lu) for disk pointer 0x%16llX at segIndex=%d, segOffset=0x%0lX in %s",
+ ordinal, ordinalTable.count(),value, segmentIndex, segOffset, this->getPath());
+ return;
+ }
+ std::tie(symbolName, addend, libraryOrdinal, symboFlags, type) = ordinalTable[ordinal].pack();
+ if ( (address < segmentStartAddress) || (address >= segmentEndAddress) )
+ throwBadBindingAddress(address, segmentEndAddress, segmentIndex, start, end, p);
+ {
+ handler(context, this, address, BIND_TYPE_THREADED_BIND,
+ symbolName, symboFlags, addend, libraryOrdinal,
+ nullptr, "", &last, false);
+ }
+ }
+
+ // The delta is bits [51..61]
+ // And bit 62 is to tell us if we are a rebase (0) or bind (1)
+ value &= ~(1ULL << 62);
+ delta = ( value & 0x3FF8000000000000 ) >> 51;
+ segOffset += delta * sizeof(intptr_t);
+ } while ( delta != 0 );
+ break;
+ }
+
+ default:
+ dyld::throwf("bad threaded bind subopcode 0x%02X", *p);
+ }
+ break;
+ default:
+ dyld::throwf("bad bind opcode %d in bind info", *p);
+ }
+ }
+ }
+ catch (const char* msg) {
+ const char* newMsg = dyld::mkstringf("%s in %s", msg, this->getPath());
+ free((void*)msg);
+ throw newMsg;
+ }
+}
+
+void ImageLoaderMachOCompressed::eachLazyBind(const LinkContext& context, bind_handler handler)
+{
+ try {
+ uint8_t type = BIND_TYPE_POINTER;
+ int segmentIndex = -1;
+ uintptr_t address = segActualLoadAddress(0);
+ uintptr_t segmentStartAddress = segActualLoadAddress(0);
+ uintptr_t segmentEndAddress = segActualEndAddress(0);
+ uintptr_t segOffset;
+ const char* symbolName = NULL;
+ uint8_t symboFlags = 0;
+ long libraryOrdinal = 0;
+ intptr_t addend = 0;
+ const uint8_t* const start = fLinkEditBase + fDyldInfo->lazy_bind_off;
+ const uint8_t* const end = &start[fDyldInfo->lazy_bind_size];
+ const uint8_t* p = start;
+ bool done = false;
+ while ( !done && (p < end) ) {
+ uint8_t immediate = *p & BIND_IMMEDIATE_MASK;
+ uint8_t opcode = *p & BIND_OPCODE_MASK;
+ ++p;
+ switch (opcode) {
+ case BIND_OPCODE_DONE:
+ // there is BIND_OPCODE_DONE at end of each lazy bind, don't stop until end of whole sequence
+ break;
+ case BIND_OPCODE_SET_DYLIB_ORDINAL_IMM:
+ libraryOrdinal = immediate;
+ break;
+ case BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB:
+ libraryOrdinal = read_uleb128(p, end);
+ break;
+ case BIND_OPCODE_SET_DYLIB_SPECIAL_IMM:
+ // the special ordinals are negative numbers
+ if ( immediate == 0 )
+ libraryOrdinal = 0;
+ else {
+ int8_t signExtended = BIND_OPCODE_MASK | immediate;
+ libraryOrdinal = signExtended;
+ }
+ break;
+ case BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:
+ symbolName = (char*)p;
+ symboFlags = immediate;
+ while (*p != '\0')
+ ++p;
+ ++p;
+ break;
+ case BIND_OPCODE_SET_TYPE_IMM:
+ type = immediate;
+ break;
+ case BIND_OPCODE_SET_ADDEND_SLEB:
+ addend = read_sleb128(p, end);
+ break;
+ case BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
+ segmentIndex = immediate;
+ if ( (segmentIndex >= fSegmentsCount) || (segmentIndex < 0) )
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has segment %d which is out of range (0..%d)",
+ segmentIndex, fSegmentsCount-1);
+ if ( !segWriteable(segmentIndex) )
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has segment %d which is not writable", segmentIndex);
+ segOffset = read_uleb128(p, end);
+ if ( segOffset > segSize(segmentIndex) )
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has offset 0x%08lX beyond segment size (0x%08lX)", segOffset, segSize(segmentIndex));
+ segmentStartAddress = segActualLoadAddress(segmentIndex);
+ segmentEndAddress = segActualEndAddress(segmentIndex);
+ address = segmentStartAddress + segOffset;
+ break;
+ case BIND_OPCODE_ADD_ADDR_ULEB:
+ address += read_uleb128(p, end);
+ break;
+ case BIND_OPCODE_DO_BIND:
+ if ( segmentIndex == -1 )
+ dyld::throwf("BIND_OPCODE_DO_BIND missing preceding BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB");
+ if ( (address < segmentStartAddress) || (address >= segmentEndAddress) )
+ throwBadBindingAddress(address, segmentEndAddress, segmentIndex, start, end, p);
+ if ( symbolName == NULL )
+ dyld::throwf("BIND_OPCODE_DO_BIND missing preceding BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM");
+ handler(context, this, address, type, symbolName, symboFlags, addend, libraryOrdinal,
+ NULL, "forced lazy ", NULL, false);
+ address += sizeof(intptr_t);
+ break;
+ case BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:
+ case BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED:
+ case BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:
+ default:
+ dyld::throwf("bad lazy bind opcode %d", *p);
+ }
+ }
+ }
+
+ catch (const char* msg) {
+ const char* newMsg = dyld::mkstringf("%s in %s", msg, this->getPath());
+ free((void*)msg);
+ throw newMsg;
+ }
+}
+
+// A program built targeting 10.5 will have hybrid stubs. When used with weak symbols
+// the classic lazy loader is used even when running on 10.6
+uintptr_t ImageLoaderMachOCompressed::doBindLazySymbol(uintptr_t* lazyPointer, const LinkContext& context)
+{
+ // only works with compressed LINKEDIT if classic symbol table is also present
+ const macho_nlist* symbolTable = NULL;
+ const char* symbolTableStrings = NULL;
+ const dysymtab_command* dynSymbolTable = NULL;
+ const uint32_t cmd_count = ((macho_header*)fMachOData)->ncmds;
+ const struct load_command* const cmds = (struct load_command*)&fMachOData[sizeof(macho_header)];
+ const struct load_command* cmd = cmds;
+ for (uint32_t i = 0; i < cmd_count; ++i) {
+ switch (cmd->cmd) {
+ case LC_SYMTAB:
+ {
+ const struct symtab_command* symtab = (struct symtab_command*)cmd;
+ symbolTableStrings = (const char*)&fLinkEditBase[symtab->stroff];
+ symbolTable = (macho_nlist*)(&fLinkEditBase[symtab->symoff]);
+ }
+ break;
+ case LC_DYSYMTAB:
+ dynSymbolTable = (struct dysymtab_command*)cmd;
+ break;
+ }
+ cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
+ }
+ // no symbol table => no lookup by address
+ if ( (symbolTable == NULL) || (dynSymbolTable == NULL) )
+ dyld::throwf("classic lazy binding used with compressed LINKEDIT at %p in image %s", lazyPointer, this->getPath());
+
+ // scan for all lazy-pointer sections
+ const bool twoLevel = this->usesTwoLevelNameSpace();
+ const uint32_t* const indirectTable = (uint32_t*)&fLinkEditBase[dynSymbolTable->indirectsymoff];
+ 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;
+ 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) {
+ const uint8_t type = sect->flags & SECTION_TYPE;
+ uint32_t symbolIndex = INDIRECT_SYMBOL_LOCAL;
+ if ( type == S_LAZY_SYMBOL_POINTERS ) {
+ const size_t pointerCount = sect->size / sizeof(uintptr_t);
+ uintptr_t* const symbolPointers = (uintptr_t*)(sect->addr + fSlide);
+ if ( (lazyPointer >= symbolPointers) && (lazyPointer < &symbolPointers[pointerCount]) ) {
+ const uint32_t indirectTableOffset = sect->reserved1;
+ const size_t lazyIndex = lazyPointer - symbolPointers;
+ symbolIndex = indirectTable[indirectTableOffset + lazyIndex];
+ }
+ }
+ if ( (symbolIndex != INDIRECT_SYMBOL_ABS) && (symbolIndex != INDIRECT_SYMBOL_LOCAL) ) {
+ const macho_nlist* symbol = &symbolTable[symbolIndex];
+ const char* symbolName = &symbolTableStrings[symbol->n_un.n_strx];
+ int libraryOrdinal = GET_LIBRARY_ORDINAL(symbol->n_desc);
+ if ( !twoLevel || context.bindFlat )
+ libraryOrdinal = BIND_SPECIAL_DYLIB_FLAT_LOOKUP;
+ uintptr_t ptrToBind = (uintptr_t)lazyPointer;
+ uintptr_t symbolAddr = bindAt(context, this, ptrToBind, BIND_TYPE_POINTER, symbolName, 0, 0, libraryOrdinal,
+ NULL, "lazy ", NULL);
+ ++fgTotalLazyBindFixups;
+ return symbolAddr;
+ }
+ }
+ }
+ break;
+ }
+ cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
+ }
+ dyld::throwf("lazy pointer not found at address %p in image %s", lazyPointer, this->getPath());
+}
+
+
+
+uintptr_t ImageLoaderMachOCompressed::doBindFastLazySymbol(uint32_t lazyBindingInfoOffset, const LinkContext& context,
+ void (*lock)(), void (*unlock)())
+{
+ // <rdar://problem/8663923> race condition with flat-namespace lazy binding
+ if ( this->usesTwoLevelNameSpace() ) {
+ // two-level namespace lookup does not require lock because dependents can't be unloaded before this image
+ }
+ else {
+ // acquire dyld global lock
+ if ( lock != NULL )
+ lock();
+ }
+
+ const uint8_t* const start = fLinkEditBase + fDyldInfo->lazy_bind_off;
+ const uint8_t* const end = &start[fDyldInfo->lazy_bind_size];
+ uint8_t segIndex;
+ uintptr_t segOffset;
+ int libraryOrdinal;
+ const char* symbolName;
+ bool doneAfterBind;
+ uintptr_t result;
+ do {
+ if ( ! getLazyBindingInfo(lazyBindingInfoOffset, start, end, &segIndex, &segOffset, &libraryOrdinal, &symbolName, &doneAfterBind) )
+ dyld::throwf("bad lazy bind info");
+
+ if ( segIndex >= fSegmentsCount )
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has segment %d which is too large (0..%d)",
+ segIndex, fSegmentsCount-1);
+ if ( segOffset > segSize(segIndex) )
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has offset 0x%08lX beyond segment size (0x%08lX)", segOffset, segSize(segIndex));
+ uintptr_t address = segActualLoadAddress(segIndex) + segOffset;
+ result = bindAt(context, this, address, BIND_TYPE_POINTER, symbolName, 0, 0, libraryOrdinal,
+ NULL, "lazy ", NULL, true);
+ // <rdar://problem/24140465> Some old apps had multiple lazy symbols bound at once
+ } while (!doneAfterBind && !context.strictMachORequired);
+
+ if ( !this->usesTwoLevelNameSpace() ) {
+ // release dyld global lock
+ if ( unlock != NULL )
+ unlock();
+ }
+ return result;
+}
+
+void ImageLoaderMachOCompressed::initializeCoalIterator(CoalIterator& it, unsigned int loadOrder, unsigned)
+{
+ it.image = this;
+ it.symbolName = " ";
+ it.loadOrder = loadOrder;
+ it.weakSymbol = false;
+ it.symbolMatches = false;
+ it.done = false;
+ it.curIndex = 0;
+ it.endIndex = (this->fDyldInfo ? this->fDyldInfo->weak_bind_size : 0);
+ it.address = 0;
+ it.type = 0;
+ it.addend = 0;
+}
+
+
+bool ImageLoaderMachOCompressed::incrementCoalIterator(CoalIterator& it)
+{
+ if ( it.done )
+ return false;
+
+ if ( (this->fDyldInfo == nullptr) || (this->fDyldInfo->weak_bind_size == 0) ) {
+ /// hmmm, ld set MH_WEAK_DEFINES or MH_BINDS_TO_WEAK, but there is no weak binding info
+ it.done = true;
+ it.symbolName = "~~~";
+ return true;
+ }
+ const uint8_t* start = fLinkEditBase + fDyldInfo->weak_bind_off;
+ const uint8_t* p = start + it.curIndex;
+ const uint8_t* end = fLinkEditBase + fDyldInfo->weak_bind_off + this->fDyldInfo->weak_bind_size;
+ uintptr_t count;
+ uintptr_t skip;
+ uintptr_t segOffset;
+ while ( p < end ) {
+ uint8_t immediate = *p & BIND_IMMEDIATE_MASK;
+ uint8_t opcode = *p & BIND_OPCODE_MASK;
+ ++p;
+ switch (opcode) {
+ case BIND_OPCODE_DONE:
+ it.done = true;
+ it.curIndex = p - start;
+ it.symbolName = "~~~"; // sorts to end
+ return true;
+ case BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:
+ it.symbolName = (char*)p;
+ it.weakSymbol = ((immediate & BIND_SYMBOL_FLAGS_NON_WEAK_DEFINITION) == 0);
+ it.symbolMatches = false;
+ while (*p != '\0')
+ ++p;
+ ++p;
+ it.curIndex = p - start;
+ return false;
+ case BIND_OPCODE_SET_TYPE_IMM:
+ it.type = immediate;
+ break;
+ case BIND_OPCODE_SET_ADDEND_SLEB:
+ it.addend = read_sleb128(p, end);
+ break;
+ case BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
+ if ( immediate >= fSegmentsCount )
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has segment %d which is too large (0..%d)",
+ immediate, fSegmentsCount-1);
+ #if __arm__
+ // <rdar://problem/23138428> iOS app compatibility
+ if ( !segWriteable(immediate) && it.image->isPositionIndependentExecutable() )
+ #elif TEXT_RELOC_SUPPORT
+ // <rdar://problem/23479396&23590867> i386 OS X app compatibility
+ if ( !segWriteable(immediate) && !segHasRebaseFixUps(immediate) && !segHasBindFixUps(immediate)
+ && (!it.image->isExecutable() || it.image->isPositionIndependentExecutable()) )
+ #else
+ if ( !segWriteable(immediate) )
+ #endif
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB targets segment %s which is not writable", segName(immediate));
+ segOffset = read_uleb128(p, end);
+ if ( segOffset > segSize(immediate) )
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has offset 0x%08lX beyond segment size (0x%08lX)", segOffset, segSize(immediate));
+ it.address = segActualLoadAddress(immediate) + segOffset;
+ break;
+ case BIND_OPCODE_ADD_ADDR_ULEB:
+ it.address += read_uleb128(p, end);
+ break;
+ case BIND_OPCODE_DO_BIND:
+ it.address += sizeof(intptr_t);
+ break;
+ case BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:
+ it.address += read_uleb128(p, end) + sizeof(intptr_t);
+ break;
+ case BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED:
+ it.address += immediate*sizeof(intptr_t) + sizeof(intptr_t);
+ break;
+ case BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:
+ count = read_uleb128(p, end);
+ skip = read_uleb128(p, end);
+ for (uint32_t i=0; i < count; ++i) {
+ it.address += skip + sizeof(intptr_t);
+ }
+ break;
+ default:
+ dyld::throwf("bad weak bind opcode '%d' found after processing %d bytes in '%s'", *p, (int)(p-start), this->getPath());
+ }
+ }
+ /// hmmm, BIND_OPCODE_DONE is missing...
+ it.done = true;
+ it.symbolName = "~~~";
+ //dyld::log("missing BIND_OPCODE_DONE for image %s\n", this->getPath());
+ return true;
+}
+
+uintptr_t ImageLoaderMachOCompressed::getAddressCoalIterator(CoalIterator& it, const LinkContext& context)
+{
+ //dyld::log("looking for %s in %s\n", it.symbolName, this->getPath());
+ const ImageLoader* foundIn = NULL;
+ const ImageLoader::Symbol* sym = this->findShallowExportedSymbol(it.symbolName, &foundIn);
+ if ( sym != NULL ) {
+ //dyld::log("sym=%p, foundIn=%p\n", sym, foundIn);
+ return foundIn->getExportedSymbolAddress(sym, context, this);
+ }
+ return 0;
+}
+
+
+void ImageLoaderMachOCompressed::updateUsesCoalIterator(CoalIterator& it, uintptr_t value, ImageLoader* targetImage, unsigned targetIndex, const LinkContext& context)
+{
+ // <rdar://problem/6570879> weak binding done too early with inserted libraries
+ if ( this->getState() < dyld_image_state_bound )
+ return;
+
+ if ( fDyldInfo == nullptr )
+ return;
+
+ const uint8_t* start = fLinkEditBase + fDyldInfo->weak_bind_off;
+ const uint8_t* p = start + it.curIndex;
+ const uint8_t* end = fLinkEditBase + fDyldInfo->weak_bind_off + this->fDyldInfo->weak_bind_size;
+
+ uint8_t type = it.type;
+ uintptr_t address = it.address;
+ const char* symbolName = it.symbolName;
+ intptr_t addend = it.addend;
+ uintptr_t count;
+ uintptr_t skip;
+ uintptr_t segOffset;
+ bool done = false;
+ bool boundSomething = false;
+ while ( !done && (p < end) ) {
+ uint8_t immediate = *p & BIND_IMMEDIATE_MASK;
+ uint8_t opcode = *p & BIND_OPCODE_MASK;
+ ++p;
+ switch (opcode) {
+ case BIND_OPCODE_DONE:
+ done = true;
+ break;
+ case BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:
+ done = true;
+ break;
+ case BIND_OPCODE_SET_TYPE_IMM:
+ type = immediate;
+ break;
+ case BIND_OPCODE_SET_ADDEND_SLEB:
+ addend = read_sleb128(p, end);
+ break;
+ case BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
+ if ( immediate >= fSegmentsCount )
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has segment %d which is too large (0..%d)",
+ immediate, fSegmentsCount-1);
+ #if __arm__
+ // <rdar://problem/23138428> iOS app compatibility
+ if ( !segWriteable(immediate) && it.image->isPositionIndependentExecutable() )
+ #elif TEXT_RELOC_SUPPORT
+ // <rdar://problem/23479396&23590867> i386 OS X app compatibility
+ if ( !segWriteable(immediate) && !segHasRebaseFixUps(immediate) && !segHasBindFixUps(immediate)
+ && (!it.image->isExecutable() || it.image->isPositionIndependentExecutable()) )
+ #else
+ if ( !segWriteable(immediate) )
+ #endif
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB targets segment %s which is not writable", segName(immediate));
+ segOffset = read_uleb128(p, end);
+ if ( segOffset > segSize(immediate) )
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has offset 0x%08lX beyond segment size (0x%08lX)", segOffset, segSize(immediate));
+ address = segActualLoadAddress(immediate) + segOffset;
+ break;
+ case BIND_OPCODE_ADD_ADDR_ULEB:
+ address += read_uleb128(p, end);
+ break;
+ case BIND_OPCODE_DO_BIND:
+ bindLocation(context, this->imageBaseAddress(), address, value, type, symbolName, addend, this->getPath(), targetImage ? targetImage->getPath() : NULL, "weak ", NULL, fSlide);
+ boundSomething = true;
+ address += sizeof(intptr_t);
+ break;
+ case BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:
+ bindLocation(context, this->imageBaseAddress(), address, value, type, symbolName, addend, this->getPath(), targetImage ? targetImage->getPath() : NULL, "weak ", NULL, fSlide);
+ boundSomething = true;
+ address += read_uleb128(p, end) + sizeof(intptr_t);
+ break;
+ case BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED:
+ bindLocation(context, this->imageBaseAddress(), address, value, type, symbolName, addend, this->getPath(), targetImage ? targetImage->getPath() : NULL, "weak ", NULL, fSlide);
+ boundSomething = true;
+ address += immediate*sizeof(intptr_t) + sizeof(intptr_t);
+ break;
+ case BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:
+ count = read_uleb128(p, end);
+ skip = read_uleb128(p, end);
+ for (uint32_t i=0; i < count; ++i) {
+ bindLocation(context, this->imageBaseAddress(), address, value, type, symbolName, addend, this->getPath(), targetImage ? targetImage->getPath() : NULL, "weak ", NULL, fSlide);
+ boundSomething = true;
+ address += skip + sizeof(intptr_t);
+ }
+ break;
+ default:
+ dyld::throwf("bad bind opcode %d in weak binding info", *p);
+ }
+ }
+ // C++ weak coalescing cannot be tracked by reference counting. Error on side of never unloading.
+ if ( boundSomething && (targetImage != this) )
+ context.addDynamicReference(this, targetImage);
+}
+
+uintptr_t ImageLoaderMachOCompressed::interposeAt(const LinkContext& context, ImageLoaderMachOCompressed* image,
+ uintptr_t addr, uint8_t type, const char*,
+ uint8_t, intptr_t, long,
+ ExtraBindData *extraBindData,
+ const char*, LastLookup*, bool runResolver)
+{
+ if ( type == BIND_TYPE_POINTER ) {
+ uintptr_t* fixupLocation = (uintptr_t*)addr;
+ uintptr_t curValue = *fixupLocation;
+ uintptr_t newValue = interposedAddress(context, curValue, image);
+ if ( newValue != curValue) {
+ *fixupLocation = newValue;
+ }
+ }
+ return 0;
+}
+
+void ImageLoaderMachOCompressed::doInterpose(const LinkContext& context)
+{
+ if ( context.verboseInterposing )
+ dyld::log("dyld: interposing %lu tuples onto image: %s\n", fgInterposingTuples.size(), this->getPath());
+
+ const dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)fMachOData;
+ if ( !ma->hasChainedFixups() ) {
+ // Note: all binds that happen as part of normal loading and fixups will have interposing applied.
+ // There is only two cases where we need to parse bind opcodes and apply interposing:
+
+ // 1) Lazy pointers are either not bound yet, or in dyld cache they are prebound (to uninterposed target)
+ eachLazyBind(context, ^(const LinkContext& ctx, ImageLoaderMachOCompressed* image,
+ uintptr_t addr, uint8_t type, const char* symbolName,
+ uint8_t symbolFlags, intptr_t addend, long libraryOrdinal,
+ ExtraBindData *extraBindData,
+ const char* msg, LastLookup* last, bool runResolver) {
+ return ImageLoaderMachOCompressed::interposeAt(ctx, image, addr, type, symbolName, symbolFlags,
+ addend, libraryOrdinal, extraBindData,
+ msg, last, runResolver);
+ });
+
+ // 2) non-lazy pointers in the dyld cache need to be interposed
+ if ( ma->inDyldCache() ) {
+ eachBind(context, ^(const LinkContext& ctx, ImageLoaderMachOCompressed* image,
+ uintptr_t addr, uint8_t type, const char* symbolName,
+ uint8_t symbolFlags, intptr_t addend, long libraryOrdinal,
+ ExtraBindData *extraBindData,
+ const char* msg, LastLookup* last, bool runResolver) {
+ return ImageLoaderMachOCompressed::interposeAt(ctx, image, addr, type, symbolName, symbolFlags,
+ addend, libraryOrdinal, extraBindData,
+ msg, last, runResolver);
+ });
+ }
+
+ }
+}
+
+
+uintptr_t ImageLoaderMachOCompressed::dynamicInterposeAt(const LinkContext& context, ImageLoaderMachOCompressed* image,
+ uintptr_t addr, uint8_t type, const char* symbolName,
+ uint8_t, intptr_t, long,
+ ExtraBindData *extraBindData,
+ const char*, LastLookup*, bool runResolver)
+{
+ if ( type == BIND_TYPE_POINTER ) {
+ uintptr_t* fixupLocation = (uintptr_t*)addr;
+ uintptr_t value = *fixupLocation;
+ // don't apply interposing to table entries.
+ if ( (context.dynamicInterposeArray <= (void*)addr) && ((void*)addr < &context.dynamicInterposeArray[context.dynamicInterposeCount]) )
+ return 0;
+ for(size_t i=0; i < context.dynamicInterposeCount; ++i) {
+ if ( value == (uintptr_t)context.dynamicInterposeArray[i].replacee ) {
+ if ( context.verboseInterposing ) {
+ dyld::log("dyld: dynamic interposing: at %p replace %p with %p in %s\n",
+ fixupLocation, context.dynamicInterposeArray[i].replacee, context.dynamicInterposeArray[i].replacement, image->getPath());
+ }
+ *fixupLocation = (uintptr_t)context.dynamicInterposeArray[i].replacement;
+ }
+ }
+ }
+ return 0;
+}
+
+void ImageLoaderMachOCompressed::dynamicInterpose(const LinkContext& context)
+{
+ if ( context.verboseInterposing )
+ dyld::log("dyld: dynamic interposing %lu tuples onto image: %s\n", context.dynamicInterposeCount, this->getPath());
+
+ // update already bound references to symbols
+ eachBind(context, ^(const LinkContext& ctx, ImageLoaderMachOCompressed* image,
+ uintptr_t addr, uint8_t type, const char* symbolName,
+ uint8_t symbolFlags, intptr_t addend, long libraryOrdinal,
+ ExtraBindData *extraBindData,
+ const char* msg, LastLookup* last, bool runResolver) {
+ return ImageLoaderMachOCompressed::dynamicInterposeAt(ctx, image, addr, type, symbolName, symbolFlags,
+ addend, libraryOrdinal, extraBindData,
+ msg, last, runResolver);
+ });
+ eachLazyBind(context, ^(const LinkContext& ctx, ImageLoaderMachOCompressed* image,
+ uintptr_t addr, uint8_t type, const char* symbolName,
+ uint8_t symbolFlags, intptr_t addend, long libraryOrdinal,
+ ExtraBindData *extraBindData,
+ const char* msg, LastLookup* last, bool runResolver) {
+ return ImageLoaderMachOCompressed::dynamicInterposeAt(ctx, image, addr, type, symbolName, symbolFlags,
+ addend, libraryOrdinal, extraBindData,
+ msg, last, runResolver);
+ });
+}
+
+const char* ImageLoaderMachOCompressed::findClosestSymbol(const void* addr, const void** closestAddr) const
+{
+ return ImageLoaderMachO::findClosestSymbol((mach_header*)fMachOData, addr, closestAddr);
+}
+
+
+#if PREBOUND_IMAGE_SUPPORT
+void ImageLoaderMachOCompressed::resetPreboundLazyPointers(const LinkContext& context)
+{
+ // no way to back off a prebound compress image
+}
+#endif
+
+
+#if __arm__ || __x86_64__
+void ImageLoaderMachOCompressed::updateAlternateLazyPointer(uint8_t* stub, void** originalLazyPointerAddr, const LinkContext& context)
+{
+#if __arm__
+ uint32_t* instructions = (uint32_t*)stub;
+ // sanity check this is a stub we understand
+ if ( (instructions[0] != 0xe59fc004) || (instructions[1] != 0xe08fc00c) || (instructions[2] != 0xe59cf000) )
+ return;
+
+ void** lazyPointerAddr = (void**)(instructions[3] + (stub + 12));
+#endif
+#if __x86_64__
+ // sanity check this is a stub we understand
+ if ( (stub[0] != 0xFF) || (stub[1] != 0x25) )
+ return;
+ int32_t ripOffset = *((int32_t*)(&stub[2]));
+ void** lazyPointerAddr = (void**)(ripOffset + stub + 6);
+#endif
+
+ // if stub does not use original lazy pointer (meaning it was optimized by update_dyld_shared_cache)
+ if ( lazyPointerAddr != originalLazyPointerAddr ) {
+ // <rdar://problem/12928448> only de-optimization lazy pointers if they are part of shared cache not loaded (because overridden)
+ const ImageLoader* lazyPointerImage = context.findImageContainingAddress(lazyPointerAddr);
+ if ( lazyPointerImage != NULL )
+ return;
+
+ // copy newly re-bound lazy pointer value to shared lazy pointer
+ *lazyPointerAddr = *originalLazyPointerAddr;
+
+ if ( context.verboseBind )
+ dyld::log("dyld: alter bind: %s: *0x%08lX = 0x%08lX \n",
+ this->getShortName(), (long)lazyPointerAddr, (long)*originalLazyPointerAddr);
+ }
+}
+#endif
+
+
+// <rdar://problem/8890875> overriding shared cache dylibs with resolvers fails
+void ImageLoaderMachOCompressed::updateOptimizedLazyPointers(const LinkContext& context)
+{
+#if __arm__ || __x86_64__
+ // find stubs and indirect symbol table
+ const struct macho_section* stubsSection = NULL;
+ const dysymtab_command* dynSymbolTable = NULL;
+ const macho_header* mh = (macho_header*)fMachOData;
+ const uint32_t cmd_count = mh->ncmds;
+ const struct load_command* const cmds = (struct load_command*)&fMachOData[sizeof(macho_header)];
+ const struct load_command* cmd = cmds;
+ for (uint32_t i = 0; i < cmd_count; ++i) {
+ if (cmd->cmd == LC_SEGMENT_COMMAND) {
+ const struct macho_segment_command* seg = (struct macho_segment_command*)cmd;
+ 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) {
+ const uint8_t type = sect->flags & SECTION_TYPE;
+ if ( type == S_SYMBOL_STUBS )
+ stubsSection = sect;
+ }
+ }
+ else if ( cmd->cmd == LC_DYSYMTAB ) {
+ dynSymbolTable = (struct dysymtab_command*)cmd;
+ }
+ cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
+ }
+ if ( dynSymbolTable == NULL )
+ return;
+ const uint32_t* const indirectTable = (uint32_t*)&fLinkEditBase[dynSymbolTable->indirectsymoff];
+ if ( stubsSection == NULL )
+ return;
+ const uint32_t stubsSize = stubsSection->reserved2;
+ const uint32_t stubsCount = (uint32_t)(stubsSection->size / stubsSize);
+ const uint32_t stubsIndirectTableOffset = stubsSection->reserved1;
+ if ( (stubsIndirectTableOffset+stubsCount) > dynSymbolTable->nindirectsyms )
+ return;
+ uint8_t* const stubsAddr = (uint8_t*)(stubsSection->addr + this->fSlide);
+
+ // for each lazy pointer section
+ cmd = cmds;
+ for (uint32_t i = 0; i < cmd_count; ++i) {
+ if (cmd->cmd == LC_SEGMENT_COMMAND) {
+ const struct macho_segment_command* seg = (struct macho_segment_command*)cmd;
+ 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* lazyPointerSection=sectionsStart; lazyPointerSection < sectionsEnd; ++lazyPointerSection) {
+ const uint8_t type = lazyPointerSection->flags & SECTION_TYPE;
+ if ( type != S_LAZY_SYMBOL_POINTERS )
+ continue;
+ const uint32_t lazyPointersCount = (uint32_t)(lazyPointerSection->size / sizeof(void*));
+ const uint32_t lazyPointersIndirectTableOffset = lazyPointerSection->reserved1;
+ if ( (lazyPointersIndirectTableOffset+lazyPointersCount) > dynSymbolTable->nindirectsyms )
+ continue;
+ void** const lazyPointersAddr = (void**)(lazyPointerSection->addr + this->fSlide);
+ // for each lazy pointer
+ for(uint32_t lpIndex=0; lpIndex < lazyPointersCount; ++lpIndex) {
+ const uint32_t lpSymbolIndex = indirectTable[lazyPointersIndirectTableOffset+lpIndex];
+ // find matching stub and validate it uses this lazy pointer
+ for(uint32_t stubIndex=0; stubIndex < stubsCount; ++stubIndex) {
+ if ( indirectTable[stubsIndirectTableOffset+stubIndex] == lpSymbolIndex ) {
+ this->updateAlternateLazyPointer(stubsAddr+stubIndex*stubsSize, &lazyPointersAddr[lpIndex], context);
+ break;
+ }
+ }
+ }
+
+ }
+ }
+ cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
+ }
+
+#endif
+}
+
+
+void ImageLoaderMachOCompressed::registerEncryption(const encryption_info_command* encryptCmd, const LinkContext& context)
+{
+#if __arm__ || __arm64__
+ if ( encryptCmd == NULL )
+ return;
+ // fMachOData not set up yet, need to manually find mach_header
+ const mach_header* mh = NULL;
+ for(unsigned int i=0; i < fSegmentsCount; ++i) {
+ if ( (segFileOffset(i) == 0) && (segFileSize(i) != 0) ) {
+ mh = (mach_header*)segActualLoadAddress(i);
+ void* start = ((uint8_t*)mh) + encryptCmd->cryptoff;
+ size_t len = encryptCmd->cryptsize;
+ uint32_t cputype = mh->cputype;
+ uint32_t cpusubtype = mh->cpusubtype;
+ uint32_t cryptid = encryptCmd->cryptid;
+ if (context.verboseMapping) {
+ dyld::log(" 0x%08lX->0x%08lX configured for FairPlay decryption\n", (long)start, (long)start+len);
+ }
+ int result = mremap_encrypted(start, len, cryptid, cputype, cpusubtype);
+ if ( result != 0 ) {
+ dyld::throwf("mremap_encrypted() => %d, errno=%d for %s\n", result, errno, this->getPath());
+ }
+ return;
+ }
+ }
+#endif
+}
+
+
+