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--- dyld/dyld-195.6/src/ImageLoaderMachOCompressed.cpp
+++ /dev/null
@@ -1,1630 +0,0 @@
-/* -*- 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"
-
-
-// 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 |= ((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->setNeverUnload();
- 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 CODESIGNING_SUPPORT
- // if this image is code signed, let kernel validate signature before mapping any pages from image
- if ( codeSigCmd != NULL )
- image->loadCodeSignature(codeSigCmd, fd, offsetInFat);
- #endif
-
- // mmap segments
- image->mapSegments(fd, offsetInFat, lenInFat, info.st_size, context);
-
- // 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] != '/' ) {
- // rdar://problem/5135363 turn relative paths into absolute paths so gdb, Symbolication can later find them
- char realPath[MAXPATHLEN];
- if ( realpath(path, realPath) != NULL )
- image->setPath(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->fGoodFirstSegment = 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)
-{
- //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, 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);
- if ( (flags & EXPORT_SYMBOL_FLAGS_KIND_MASK) == 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
- read_uleb128(exportNode, exportTrieEnd); // skip over stub
- 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;
- }
- else if ( (flags & EXPORT_SYMBOL_FLAGS_KIND_MASK) == 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;
- }
- else
- 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) && !(*foundIn)->neverUnload() )
- this->addDynamicReference(*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, "lazy forced", NULL, true);
- 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", *p);
- }
- }
- /// 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);
- }
- }
- if ( boundSomething && (targetImage != this) && !targetImage->neverUnload() )
- this->addDynamicReference(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)
-{
-#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 ) {
- // copy newly re-bound lazy pointer value to shared lazy pointer
- *lazyPointerAddr = *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);
- }
-
-#endif
-}
-
-