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+++ dyld/dyld-239.4/src/ImageLoaderMachOCompressed.cpp
@@ -0,0 +1,1660 @@
+/* -*- 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@
+ */
+
+
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/fcntl.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <sys/param.h>
+#include <mach/mach.h>
+#include <mach/thread_status.h>
+#include <mach-o/loader.h>
+
+#include "ImageLoaderMachOCompressed.h"
+#include "mach-o/dyld_images.h"
+
+#ifndef EXPORT_SYMBOL_FLAGS_KIND_ABSOLUTE
+ #define EXPORT_SYMBOL_FLAGS_KIND_ABSOLUTE 0x02
+#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
+
+
+static uintptr_t read_uleb128(const uint8_t*& p, const uint8_t* end)
+{
+ uint64_t result = 0;
+ int bit = 0;
+ do {
+ if (p == end)
+ dyld::throwf("malformed uleb128");
+
+ uint64_t slice = *p & 0x7f;
+
+ if (bit > 63)
+ dyld::throwf("uleb128 too big for uint64, bit=%d, result=0x%0llX", bit, result);
+ else {
+ result |= (slice << bit);
+ bit += 7;
+ }
+ } while (*p++ & 0x80);
+ return result;
+}
+
+
+static intptr_t read_sleb128(const uint8_t*& p, const uint8_t* end)
+{
+ int64_t result = 0;
+ int bit = 0;
+ uint8_t byte;
+ do {
+ if (p == end)
+ throw "malformed sleb128";
+ byte = *p++;
+ result |= (((int64_t)(byte & 0x7f)) << bit);
+ bit += 7;
+ } while (byte & 0x80);
+ // sign extend negative numbers
+ if ( (byte & 0x40) != 0 )
+ result |= (-1LL) << bit;
+ return result;
+}
+
+
+// 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->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,
+ uint64_t offsetInFat, uint64_t lenInFat, const struct stat& info,
+ unsigned int segCount, unsigned int libCount,
+ const struct linkedit_data_command* codeSigCmd, 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);
+
+ // mmap segments
+ image->mapSegments(fd, offsetInFat, lenInFat, info.st_size, 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
+ image->setPath(path);
+
+ // make sure path is stable before recording in dyld_all_image_infos
+ image->setMapped(context);
+
+ // pre-fetch content of __DATA and __LINKEDIT segment for faster launches
+ // don't do this on prebound images or if prefetching is disabled
+ if ( !context.preFetchDisabled && !image->isPrebindable()) {
+ image->preFetchDATA(fd, offsetInFat, context);
+ image->markSequentialLINKEDIT(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);
+
+ // 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);
+ 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();
+
+ // 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)
+{
+}
+
+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();
+}
+
+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::markFreeLINKEDIT(const LinkContext& context)
+{
+ // mark that we are done with rebase and bind info
+ markLINKEDIT(context, MADV_FREE);
+}
+
+void ImageLoaderMachOCompressed::markSequentialLINKEDIT(const LinkContext& context)
+{
+ // mark the rebase and bind info and using sequential access
+ markLINKEDIT(context, MADV_SEQUENTIAL);
+}
+
+void ImageLoaderMachOCompressed::markLINKEDIT(const LinkContext& context, int advise)
+{
+ // if not loaded at preferred address, mark rebase info
+ uintptr_t start = 0;
+ if ( (fSlide != 0) && (fDyldInfo->rebase_size != 0) )
+ start = (uintptr_t)fLinkEditBase + fDyldInfo->rebase_off;
+ else if ( fDyldInfo->bind_off != 0 )
+ start = (uintptr_t)fLinkEditBase + fDyldInfo->bind_off;
+ else
+ return; // no binding info to prefetch
+
+ // end is at end of bind info
+ uintptr_t end = 0;
+ if ( fDyldInfo->bind_off != 0 )
+ end = (uintptr_t)fLinkEditBase + fDyldInfo->bind_off + fDyldInfo->bind_size;
+ else if ( fDyldInfo->rebase_off != 0 )
+ end = (uintptr_t)fLinkEditBase + fDyldInfo->rebase_off + fDyldInfo->rebase_size;
+ else
+ return;
+
+
+ // round to whole pages
+ start = start & (-4096);
+ end = (end + 4095) & (-4096);
+
+ // do nothing if only one page of rebase/bind info
+ if ( (end-start) <= 4096 )
+ return;
+
+ // tell kernel about our access to these pages
+ madvise((void*)start, end-start, advise);
+ if ( context.verboseMapping ) {
+ const char* adstr = "sequential";
+ if ( advise == MADV_FREE )
+ adstr = "free";
+ dyld::log("%18s %s 0x%0lX -> 0x%0lX for %s\n", "__LINKEDIT", adstr, start, end-1, this->getPath());
+ }
+}
+
+
+
+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 beyond end 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)
+{
+ CRSetCrashLogMessage2(this->getPath());
+ const uintptr_t slide = this->fSlide;
+ const uint8_t* const start = fLinkEditBase + fDyldInfo->rebase_off;
+ const uint8_t* const end = &start[fDyldInfo->rebase_size];
+ const uint8_t* p = start;
+
+ try {
+ uint8_t type = 0;
+ int segmentIndex = 0;
+ uintptr_t address = segActualLoadAddress(0);
+ uintptr_t segmentEndAddress = segActualEndAddress(0);
+ uint32_t count;
+ uint32_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 (%d)\n",
+ segmentIndex, fSegmentsCount);
+ address = segActualLoadAddress(segmentIndex) + read_uleb128(p, end);
+ segmentEndAddress = segActualEndAddress(segmentIndex);
+ 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 >= 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 >= 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 >= 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 >= 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);
+ }
+ }
+ }
+ catch (const char* msg) {
+ const char* newMsg = dyld::mkstringf("%s in %s", msg, this->getPath());
+ free((void*)msg);
+ throw newMsg;
+ }
+ CRSetCrashLogMessage2(NULL);
+}
+
+//
+// This function is the hotspot of symbol lookup. It was pulled out of findExportedSymbol()
+// to enable it to be re-written in assembler if needed.
+//
+const uint8_t* ImageLoaderMachOCompressed::trieWalk(const uint8_t* start, const uint8_t* end, const char* s)
+{
+ const uint8_t* p = start;
+ while ( p != NULL ) {
+ uint32_t terminalSize = *p++;
+ if ( terminalSize > 127 ) {
+ // except for re-export-with-rename, all terminal sizes fit in one byte
+ --p;
+ terminalSize = read_uleb128(p, end);
+ }
+ if ( (*s == '\0') && (terminalSize != 0) ) {
+ //dyld::log("trieWalk(%p) returning %p\n", start, p);
+ return p;
+ }
+ const uint8_t* children = p + terminalSize;
+ //dyld::log("trieWalk(%p) sym=%s, terminalSize=%d, children=%p\n", start, s, terminalSize, children);
+ uint8_t childrenRemaining = *children++;
+ p = children;
+ uint32_t nodeOffset = 0;
+ for (; childrenRemaining > 0; --childrenRemaining) {
+ const char* ss = s;
+ //dyld::log("trieWalk(%p) child str=%s\n", start, (char*)p);
+ bool wrongEdge = false;
+ // scan whole edge to get to next edge
+ // if edge is longer than target symbol name, don't read past end of symbol name
+ char c = *p;
+ while ( c != '\0' ) {
+ if ( !wrongEdge ) {
+ if ( c != *ss )
+ wrongEdge = true;
+ ++ss;
+ }
+ ++p;
+ c = *p;
+ }
+ if ( wrongEdge ) {
+ // advance to next child
+ ++p; // skip over zero terminator
+ // skip over uleb128 until last byte is found
+ while ( (*p & 0x80) != 0 )
+ ++p;
+ ++p; // skil over last byte of uleb128
+ }
+ else {
+ // the symbol so far matches this edge (child)
+ // so advance to the child's node
+ ++p;
+ nodeOffset = read_uleb128(p, end);
+ s = ss;
+ //dyld::log("trieWalk() found matching edge advancing to node 0x%x\n", nodeOffset);
+ break;
+ }
+ }
+ if ( nodeOffset != 0 )
+ p = &start[nodeOffset];
+ else
+ p = NULL;
+ }
+ //dyld::log("trieWalk(%p) return NULL\n", start);
+ return NULL;
+}
+
+
+const ImageLoader::Symbol* ImageLoaderMachOCompressed::findExportedSymbol(const char* symbol, const ImageLoader** foundIn) const
+{
+ //dyld::log("Compressed::findExportedSymbol(%s) in %s\n", symbol, this->getShortName());
+ if ( fDyldInfo->export_size == 0 )
+ return NULL;
+#if LOG_BINDINGS
+ dyld::logBindings("%s: %s\n", this->getShortName(), symbol);
+#endif
+ ++ImageLoaderMachO::fgSymbolTrieSearchs;
+ const uint8_t* start = &fLinkEditBase[fDyldInfo->export_off];
+ const uint8_t* end = &start[fDyldInfo->export_size];
+ const uint8_t* foundNodeStart = this->trieWalk(start, end, symbol);
+ if ( foundNodeStart != NULL ) {
+ const uint8_t* p = foundNodeStart;
+ const uint32_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 uint32_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(ordinal-1);
+ //dyld::log("Compressed::findExportedSymbol(), %s -> %s/%s\n", symbol, reexportedFrom->getShortName(), importedName);
+ return reexportedFrom->findExportedSymbol(importedName, true, 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
+{
+ const uint8_t* start = &fLinkEditBase[fDyldInfo->export_off];
+ const uint8_t* end = &start[fDyldInfo->export_size];
+ return ( (start <= addr) && (addr < end) );
+}
+
+
+uintptr_t ImageLoaderMachOCompressed::exportedSymbolAddress(const LinkContext& context, const Symbol* symbol, const ImageLoader* requestor, bool runResolver) const
+{
+ const uint8_t* exportNode = (uint8_t*)symbol;
+ const uint8_t* exportTrieStart = fLinkEditBase + fDyldInfo->export_off;
+ const uint8_t* exportTrieEnd = exportTrieStart + fDyldInfo->export_size;
+ 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());
+ uint32_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
+ for (std::vector<InterposeTuple>::iterator it=fgInterposingTuples.begin(); it != fgInterposingTuples.end(); it++) {
+ // replace all references to 'replacee' with 'replacement'
+ if ( (stub == it->replacee) && (requestor != it->replacementImage) ) {
+ if ( context.verboseInterposing ) {
+ dyld::log("dyld interposing: lazy replace 0x%lX with 0x%lX from %s\n",
+ it->replacee, it->replacement, this->getPath());
+ }
+ return it->replacement;
+ }
+ }
+ typedef uintptr_t (*ResolverProc)(void);
+ ResolverProc resolver = (ResolverProc)(read_uleb128(exportNode, exportTrieEnd) + (uintptr_t)fMachOData);
+ uintptr_t result = (*resolver)();
+ if ( context.verboseBind )
+ dyld::log("dyld: resolver at %p returned 0x%08lX\n", resolver, result);
+ 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=%d 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=%d at node=%p", flags, symbol);
+ return read_uleb128(exportNode, exportTrieEnd);
+ default:
+ dyld::throwf("unsupported exported symbol kind. flags=%d at node=%p", flags, symbol);
+ }
+}
+
+bool ImageLoaderMachOCompressed::exportedSymbolIsWeakDefintion(const Symbol* symbol) const
+{
+ const uint8_t* exportNode = (uint8_t*)symbol;
+ const uint8_t* exportTrieStart = fLinkEditBase + fDyldInfo->export_off;
+ const uint8_t* exportTrieEnd = exportTrieStart + fDyldInfo->export_size;
+ if ( (exportNode < exportTrieStart) || (exportNode > exportTrieEnd) )
+ throw "symbol is not in trie";
+ uint32_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->ImageLoaderMachO::findExportedSymbol(symbolName, false, 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");
+}
+
+
+uintptr_t ImageLoaderMachOCompressed::resolveTwolevel(const LinkContext& context, const ImageLoader* targetImage, bool weak_import,
+ const char* symbolName, bool runResolver, const ImageLoader** foundIn)
+{
+ // two level lookup
+ const Symbol* sym = targetImage->findExportedSymbol(symbolName, true, 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;
+ }
+
+ // nowhere to be found
+ throwSymbolNotFound(context, symbolName, this->getPath(), targetImage->getPath());
+}
+
+
+uintptr_t ImageLoaderMachOCompressed::resolve(const LinkContext& context, const char* symbolName,
+ uint8_t symboFlags, int 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_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 (%u) too big for symbol %s in %s",
+ libraryOrdinal, symbolName, this->getPath());
+ }
+ else if ( (unsigned)libraryOrdinal <= libraryCount() ) {
+ *targetImage = libImage(libraryOrdinal-1);
+ }
+ else {
+ dyld::throwf("bad mach-o binary, library ordinal (%u) 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 #%d could not be loaded",
+ symbolName, this->getPath(), libraryOrdinal);
+ }
+ }
+ else {
+ symbolAddress = resolveTwolevel(context, *targetImage, weak_import, symbolName, 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, uintptr_t addr, uint8_t type, const char* symbolName,
+ uint8_t symboFlags, intptr_t addend, int libraryOrdinal, const char* msg,
+ LastLookup* last, bool runResolver)
+{
+ const ImageLoader* targetImage;
+ uintptr_t symbolAddress;
+
+ // resolve symbol
+ symbolAddress = this->resolve(context, symbolName, symboFlags, libraryOrdinal, &targetImage, last, runResolver);
+
+ // do actual update
+ return this->bindLocation(context, addr, symbolAddress, targetImage, type, symbolName, addend, msg);
+}
+
+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 beyond end of 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
+ }
+ 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, &ImageLoaderMachOCompressed::bindAt);
+
+ #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);
+
+ // tell kernel we are done with chunks of LINKEDIT
+ if ( !context.preFetchDisabled )
+ this->markFreeLINKEDIT(context);
+ }
+
+ // 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, &ImageLoaderMachOCompressed::bindAt);
+}
+
+void ImageLoaderMachOCompressed::eachBind(const LinkContext& context, bind_handler handler)
+{
+ try {
+ uint8_t type = 0;
+ int segmentIndex = 0;
+ uintptr_t address = segActualLoadAddress(0);
+ uintptr_t segmentEndAddress = segActualEndAddress(0);
+ const char* symbolName = NULL;
+ uint8_t symboFlags = 0;
+ int libraryOrdinal = 0;
+ intptr_t addend = 0;
+ uint32_t count;
+ uint32_t skip;
+ 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;
+ 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 )
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has segment %d which is too large (%d)\n",
+ segmentIndex, fSegmentsCount);
+ address = segActualLoadAddress(segmentIndex) + read_uleb128(p, end);
+ segmentEndAddress = segActualEndAddress(segmentIndex);
+ break;
+ case BIND_OPCODE_ADD_ADDR_ULEB:
+ address += read_uleb128(p, end);
+ break;
+ case BIND_OPCODE_DO_BIND:
+ if ( address >= segmentEndAddress )
+ throwBadBindingAddress(address, segmentEndAddress, segmentIndex, start, end, p);
+ (this->*handler)(context, address, type, symbolName, symboFlags, addend, libraryOrdinal, "", &last, false);
+ address += sizeof(intptr_t);
+ break;
+ case BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:
+ if ( address >= segmentEndAddress )
+ throwBadBindingAddress(address, segmentEndAddress, segmentIndex, start, end, p);
+ (this->*handler)(context, address, type, symbolName, symboFlags, addend, libraryOrdinal, "", &last, false);
+ address += read_uleb128(p, end) + sizeof(intptr_t);
+ break;
+ case BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED:
+ if ( address >= segmentEndAddress )
+ throwBadBindingAddress(address, segmentEndAddress, segmentIndex, start, end, p);
+ (this->*handler)(context, address, type, symbolName, symboFlags, addend, libraryOrdinal, "", &last, false);
+ 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) {
+ if ( address >= segmentEndAddress )
+ throwBadBindingAddress(address, segmentEndAddress, segmentIndex, start, end, p);
+ (this->*handler)(context, address, type, symbolName, symboFlags, addend, libraryOrdinal, "", &last, false);
+ address += skip + sizeof(intptr_t);
+ }
+ 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 = 0;
+ uintptr_t address = segActualLoadAddress(0);
+ uintptr_t segmentEndAddress = segActualEndAddress(0);
+ const char* symbolName = NULL;
+ uint8_t symboFlags = 0;
+ int 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 )
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has segment %d which is too large (%d)\n",
+ segmentIndex, fSegmentsCount);
+ address = segActualLoadAddress(segmentIndex) + read_uleb128(p, end);
+ segmentEndAddress = segActualEndAddress(segmentIndex);
+ break;
+ case BIND_OPCODE_ADD_ADDR_ULEB:
+ address += read_uleb128(p, end);
+ break;
+ case BIND_OPCODE_DO_BIND:
+ if ( address >= segmentEndAddress )
+ throwBadBindingAddress(address, segmentEndAddress, segmentIndex, start, end, p);
+ (this->*handler)(context, address, type, symbolName, symboFlags, addend, libraryOrdinal, "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 uint32_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 uint32_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, ptrToBind, BIND_TYPE_POINTER, symbolName, 0, 0, libraryOrdinal, "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];
+ if ( lazyBindingInfoOffset > fDyldInfo->lazy_bind_size ) {
+ dyld::throwf("fast lazy bind offset out of range (%u, max=%u) in image %s",
+ lazyBindingInfoOffset, fDyldInfo->lazy_bind_size, this->getPath());
+ }
+
+ uint8_t type = BIND_TYPE_POINTER;
+ uintptr_t address = 0;
+ const char* symbolName = NULL;
+ uint8_t symboFlags = 0;
+ int libraryOrdinal = 0;
+ bool done = false;
+ uintptr_t result = 0;
+ const uint8_t* p = &start[lazyBindingInfoOffset];
+ 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;
+ 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_SEGMENT_AND_OFFSET_ULEB:
+ if ( immediate > fSegmentsCount )
+ dyld::throwf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB has segment %d which is too large (%d)\n",
+ immediate, fSegmentsCount);
+ address = segActualLoadAddress(immediate) + read_uleb128(p, end);
+ break;
+ case BIND_OPCODE_DO_BIND:
+
+
+ result = this->bindAt(context, address, type, symbolName, 0, 0, libraryOrdinal, "lazy ", NULL, true);
+ break;
+ case BIND_OPCODE_SET_ADDEND_SLEB:
+ case BIND_OPCODE_ADD_ADDR_ULEB:
+ 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);
+ }
+ }
+
+ if ( !this->usesTwoLevelNameSpace() ) {
+ // release dyld global lock
+ if ( unlock != NULL )
+ unlock();
+ }
+ return result;
+}
+
+void ImageLoaderMachOCompressed::initializeCoalIterator(CoalIterator& it, unsigned int loadOrder)
+{
+ it.image = this;
+ it.symbolName = " ";
+ it.loadOrder = loadOrder;
+ it.weakSymbol = false;
+ it.symbolMatches = false;
+ it.done = false;
+ it.curIndex = 0;
+ it.endIndex = this->fDyldInfo->weak_bind_size;
+ it.address = 0;
+ it.type = 0;
+ it.addend = 0;
+}
+
+
+bool ImageLoaderMachOCompressed::incrementCoalIterator(CoalIterator& it)
+{
+ if ( it.done )
+ return false;
+
+ if ( 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;
+ uint32_t count;
+ uint32_t skip;
+ 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 (%d)\n",
+ immediate, fSegmentsCount);
+ it.address = segActualLoadAddress(immediate) + read_uleb128(p, end);
+ 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->findExportedSymbol(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, const LinkContext& context)
+{
+ // <rdar://problem/6570879> weak binding done too early with inserted libraries
+ if ( this->getState() < dyld_image_state_bound )
+ 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;
+ uint32_t count;
+ uint32_t skip;
+ 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 (%d)\n",
+ immediate, fSegmentsCount);
+ address = segActualLoadAddress(immediate) + read_uleb128(p, end);
+ break;
+ case BIND_OPCODE_ADD_ADDR_ULEB:
+ address += read_uleb128(p, end);
+ break;
+ case BIND_OPCODE_DO_BIND:
+ bindLocation(context, address, value, targetImage, type, symbolName, addend, "weak ");
+ boundSomething = true;
+ address += sizeof(intptr_t);
+ break;
+ case BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:
+ bindLocation(context, address, value, targetImage, type, symbolName, addend, "weak ");
+ boundSomething = true;
+ address += read_uleb128(p, end) + sizeof(intptr_t);
+ break;
+ case BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED:
+ bindLocation(context, address, value, targetImage, type, symbolName, addend, "weak ");
+ 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, address, value, targetImage, type, symbolName, addend, "weak ");
+ 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, uintptr_t addr, uint8_t type, const char*,
+ uint8_t, intptr_t, int, const char*, LastLookup*, bool runResolver)
+{
+ if ( type == BIND_TYPE_POINTER ) {
+ uintptr_t* fixupLocation = (uintptr_t*)addr;
+ uintptr_t value = *fixupLocation;
+ for (std::vector<InterposeTuple>::iterator it=fgInterposingTuples.begin(); it != fgInterposingTuples.end(); it++) {
+ // replace all references to 'replacee' with 'replacement'
+ if ( (value == it->replacee) && (this != it->replacementImage) ) {
+ if ( context.verboseInterposing ) {
+ dyld::log("dyld: interposing: at %p replace 0x%lX with 0x%lX in %s\n",
+ fixupLocation, it->replacee, it->replacement, this->getPath());
+ }
+ *fixupLocation = it->replacement;
+ }
+ }
+ }
+ 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());
+
+ // update prebound symbols
+ eachBind(context, &ImageLoaderMachOCompressed::interposeAt);
+ eachLazyBind(context, &ImageLoaderMachOCompressed::interposeAt);
+}
+
+
+
+
+const char* ImageLoaderMachOCompressed::findClosestSymbol(const void* addr, const void** closestAddr) const
+{
+ // called by dladdr()
+ // 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) )
+ return NULL;
+
+ uintptr_t targetAddress = (uintptr_t)addr - fSlide;
+ const struct macho_nlist* bestSymbol = NULL;
+ // first walk all global symbols
+ const struct macho_nlist* const globalsStart = &symbolTable[dynSymbolTable->iextdefsym];
+ const struct macho_nlist* const globalsEnd= &globalsStart[dynSymbolTable->nextdefsym];
+ for (const struct macho_nlist* s = globalsStart; s < globalsEnd; ++s) {
+ if ( (s->n_type & N_TYPE) == N_SECT ) {
+ if ( bestSymbol == NULL ) {
+ if ( s->n_value <= targetAddress )
+ bestSymbol = s;
+ }
+ else if ( (s->n_value <= targetAddress) && (bestSymbol->n_value < s->n_value) ) {
+ bestSymbol = s;
+ }
+ }
+ }
+ // next walk all local symbols
+ const struct macho_nlist* const localsStart = &symbolTable[dynSymbolTable->ilocalsym];
+ const struct macho_nlist* const localsEnd= &localsStart[dynSymbolTable->nlocalsym];
+ for (const struct macho_nlist* s = localsStart; s < localsEnd; ++s) {
+ if ( ((s->n_type & N_TYPE) == N_SECT) && ((s->n_type & N_STAB) == 0) ) {
+ if ( bestSymbol == NULL ) {
+ if ( s->n_value <= targetAddress )
+ bestSymbol = s;
+ }
+ else if ( (s->n_value <= targetAddress) && (bestSymbol->n_value < s->n_value) ) {
+ bestSymbol = s;
+ }
+ }
+ }
+ if ( bestSymbol != NULL ) {
+#if __arm__
+ if (bestSymbol->n_desc & N_ARM_THUMB_DEF)
+ *closestAddr = (void*)((bestSymbol->n_value | 1) + fSlide);
+ else
+ *closestAddr = (void*)(bestSymbol->n_value + fSlide);
+#else
+ *closestAddr = (void*)(bestSymbol->n_value + fSlide);
+#endif
+ return &symbolTableStrings[bestSymbol->n_un.n_strx];
+ }
+ return NULL;
+}
+
+
+#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 lazy pointer sections
+ const struct macho_section* stubsSection = NULL;
+ const struct macho_section* lazyPointerSection = 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 ( type == S_LAZY_SYMBOL_POINTERS )
+ lazyPointerSection = sect;
+ }
+ }
+ else if ( cmd->cmd == LC_DYSYMTAB ) {
+ dynSymbolTable = (struct dysymtab_command*)cmd;
+ }
+ cmd = (const struct load_command*)(((char*)cmd)+cmd->cmdsize);
+ }
+
+ // sanity check
+ if ( dynSymbolTable == NULL )
+ return;
+ if ( (stubsSection == NULL) || (lazyPointerSection == NULL) )
+ return;
+ const uint32_t stubsCount = stubsSection->size / stubsSection->reserved2;
+ const uint32_t lazyPointersCount = lazyPointerSection->size / sizeof(void*);
+ if ( stubsCount != lazyPointersCount )
+ return;
+ const uint32_t stubsIndirectTableOffset = stubsSection->reserved1;
+ const uint32_t lazyPointersIndirectTableOffset = lazyPointerSection->reserved1;
+ if ( (stubsIndirectTableOffset+stubsCount) > dynSymbolTable->nindirectsyms )
+ return;
+ if ( (lazyPointersIndirectTableOffset+lazyPointersCount) > dynSymbolTable->nindirectsyms )
+ return;
+
+ // walk stubs and lazy pointers
+ const uint32_t* const indirectTable = (uint32_t*)&fLinkEditBase[dynSymbolTable->indirectsymoff];
+ void** const lazyPointersStartAddr = (void**)(lazyPointerSection->addr + this->fSlide);
+ uint8_t* const stubsStartAddr = (uint8_t*)(stubsSection->addr + this->fSlide);
+ uint8_t* stub = stubsStartAddr;
+ void** lpa = lazyPointersStartAddr;
+ for(uint32_t i=0; i < stubsCount; ++i, stub += stubsSection->reserved2, ++lpa) {
+ // sanity check symbol index of stub and lazy pointer match
+ if ( indirectTable[stubsIndirectTableOffset+i] != indirectTable[lazyPointersIndirectTableOffset+i] )
+ continue;
+ this->updateAlternateLazyPointer(stub, lpa, context);
+ }
+
+#endif
+}
+
+