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All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ #include <stdint.h> #include <string.h> #include <assert.h> #include <uuid/uuid.h> #include <mach/mach.h> #include <fcntl.h> #include <errno.h> #include <unistd.h> #include <sys/uio.h> #include <sys/param.h> #include <sys/sysctl.h> #include <sys/resource.h> #include <sys/types.h> #include <sys/stat.h> #include <sys/mman.h> #include <dirent.h> #include <string> #include <map> #include <list> #include <unordered_set> #include <unordered_map> #include "LaunchCacheFormat.h" #include "LaunchCacheWriter.h" #include "shared-cache/dyld_cache_format.h" #include "shared-cache/DyldSharedCache.h" #include "shared-cache/FileUtils.h" namespace std { template <> struct hash<dyld3::launch_cache::binary_format::ImageRef> { std::size_t operator()(const dyld3::launch_cache::binary_format::ImageRef& value) const { return std::hash<uint16_t>()(value.value()); } }; } namespace dyld3 { namespace launch_cache { static uintptr_t align(uintptr_t value, uintptr_t align) { return (value+align-1) & (-align); } //////////////////////////// ImageGroupWriter //////////////////////////////////////// ImageGroupWriter::ImageGroupWriter(uint32_t groupNum, bool pages16KB, bool is64, bool dylibsExpectedOnDisk, bool mtimeAndInodeAreValid) : _isDiskImage(groupNum != 0), _is64(is64), _groupNum(groupNum), _pageSize(pages16KB ? 0x4000 : 0x1000), _dylibsExpectedOnDisk(dylibsExpectedOnDisk), _imageFileInfoIsCdHash(!mtimeAndInodeAreValid) { } uint32_t ImageGroupWriter::size() const { binary_format::ImageGroup tempGroup; layoutBinary(&tempGroup); return tempGroup.stringsPoolOffset + tempGroup.stringsPoolSize; } void ImageGroupWriter::layoutBinary(binary_format::ImageGroup* grp) const { grp->imagesEntrySize = _isDiskImage ? sizeof(binary_format::DiskImage) : sizeof(binary_format::CachedImage); grp->groupNum = _groupNum; grp->dylibsExpectedOnDisk = _dylibsExpectedOnDisk; grp->imageFileInfoIsCdHash = _imageFileInfoIsCdHash; grp->padding = 0; grp->imagesPoolCount = imageCount(); grp->imagesPoolOffset = sizeof(binary_format::ImageGroup); uint32_t imagesPoolSize = grp->imagesEntrySize * grp->imagesPoolCount; grp->imageAliasCount = (uint32_t)_aliases.size(); grp->imageAliasOffset = grp->imagesPoolOffset + imagesPoolSize; uint32_t imageAliasSize = grp->imageAliasCount * sizeof(binary_format::AliasEntry); grp->segmentsPoolCount = (uint32_t)_segmentPool.size(); grp->segmentsPoolOffset = (uint32_t)align(grp->imageAliasOffset + imageAliasSize, 8); uint32_t segmentsPoolSize = grp->segmentsPoolCount * sizeof(uint64_t); grp->dependentsPoolCount = (uint32_t)_dependentsPool.size(); grp->dependentsPoolOffset = grp->segmentsPoolOffset + segmentsPoolSize; uint32_t dependentsPoolSize = grp->dependentsPoolCount * sizeof(binary_format::ImageRef); grp->intializerOffsetPoolCount = (uint32_t)_initializerOffsets.size(); grp->intializerOffsetPoolOffset = (uint32_t)align(grp->dependentsPoolOffset + dependentsPoolSize, 4); uint32_t intializerOffsetSize = grp->intializerOffsetPoolCount * sizeof(uint32_t); grp->intializerListPoolCount = (uint32_t)_initializerBeforeLists.size(); grp->intializerListPoolOffset = grp->intializerOffsetPoolOffset + intializerOffsetSize; uint32_t intializerListPoolSize = grp->intializerListPoolCount * sizeof(binary_format::ImageRef); grp->targetsPoolCount = (uint32_t)_targetsPool.size(); grp->targetsOffset = (uint32_t)align(grp->intializerListPoolOffset + intializerListPoolSize, 8); uint32_t targetsSize = grp->targetsPoolCount * sizeof(TargetSymbolValue); grp->fixupsPoolSize = (uint32_t)_fixupsPool.size(); grp->fixupsOffset = (uint32_t)align(grp->targetsOffset + targetsSize, 4); grp->cachePatchTableCount = (uint32_t)_patchPool.size(); grp->cachePatchTableOffset = (uint32_t)align(grp->fixupsOffset + grp->fixupsPoolSize, 4); uint32_t patchTableSize = grp->cachePatchTableCount * sizeof(binary_format::PatchTable); grp->cachePatchOffsetsCount = (uint32_t)_patchLocationPool.size(); grp->cachePatchOffsetsOffset = grp->cachePatchTableOffset + patchTableSize; uint32_t patchOffsetsSize = grp->cachePatchOffsetsCount * sizeof(binary_format::PatchOffset); grp->symbolOverrideTableCount = (uint32_t)_dyldCacheSymbolOverridePool.size(); grp->symbolOverrideTableOffset = grp->cachePatchOffsetsOffset + patchOffsetsSize; uint32_t symbolOverrideSize = grp->symbolOverrideTableCount * sizeof(binary_format::DyldCacheOverride); grp->imageOverrideTableCount = (uint32_t)_imageOverridePool.size(); grp->imageOverrideTableOffset = grp->symbolOverrideTableOffset + symbolOverrideSize; uint32_t imageOverrideSize = grp->imageOverrideTableCount * sizeof(binary_format::ImageRefOverride); grp->dofOffsetPoolCount = (uint32_t)_dofOffsets.size(); grp->dofOffsetPoolOffset = grp->imageOverrideTableOffset + imageOverrideSize; uint32_t dofOffsetSize = grp->dofOffsetPoolCount * sizeof(uint32_t); grp->indirectGroupNumPoolCount = (uint32_t)_indirectGroupNumPool.size(); grp->indirectGroupNumPoolOffset = grp->dofOffsetPoolOffset + dofOffsetSize; uint32_t indirectGroupNumSize = grp->indirectGroupNumPoolCount * sizeof(uint32_t); grp->stringsPoolSize = (uint32_t)_stringPool.size(); grp->stringsPoolOffset = grp->indirectGroupNumPoolOffset + indirectGroupNumSize; } void ImageGroupWriter::finalizeTo(Diagnostics& diag, const std::vector<const BinaryImageGroupData*>& curGroups, binary_format::ImageGroup* grp) const { layoutBinary(grp); uint8_t* buffer = (uint8_t*)grp; if ( imageCount() > 0 ) { uint32_t pad1Size = grp->segmentsPoolOffset - (grp->imageAliasOffset + grp->imageAliasCount * sizeof(binary_format::AliasEntry)); uint32_t pad2Size = grp->targetsOffset - (grp->intializerListPoolOffset + grp->intializerListPoolCount * sizeof(binary_format::ImageRef)); memcpy(&buffer[grp->imagesPoolOffset], &imageByIndex(0), grp->imagesEntrySize * grp->imagesPoolCount); memcpy(&buffer[grp->imageAliasOffset], &_aliases[0], grp->imageAliasCount * sizeof(binary_format::AliasEntry)); bzero( &buffer[grp->segmentsPoolOffset-pad1Size], pad1Size); memcpy(&buffer[grp->segmentsPoolOffset], &_segmentPool[0], grp->segmentsPoolCount * sizeof(uint64_t)); memcpy(&buffer[grp->dependentsPoolOffset], &_dependentsPool[0], grp->dependentsPoolCount * sizeof(binary_format::ImageRef)); memcpy(&buffer[grp->intializerListPoolOffset], &_initializerBeforeLists[0], grp->intializerListPoolCount * sizeof(binary_format::ImageRef)); memcpy(&buffer[grp->intializerOffsetPoolOffset],&_initializerOffsets[0], grp->intializerOffsetPoolCount * sizeof(uint32_t)); bzero( &buffer[grp->targetsOffset-pad2Size], pad2Size); memcpy(&buffer[grp->targetsOffset], &_targetsPool[0], grp->targetsPoolCount * sizeof(TargetSymbolValue)); memcpy(&buffer[grp->fixupsOffset], _fixupsPool.start(), grp->fixupsPoolSize); memcpy(&buffer[grp->cachePatchTableOffset], &_patchPool[0], grp->cachePatchTableCount * sizeof(binary_format::PatchTable)); memcpy(&buffer[grp->cachePatchOffsetsOffset], &_patchLocationPool[0], grp->cachePatchOffsetsCount * sizeof(binary_format::PatchOffset)); memcpy(&buffer[grp->symbolOverrideTableOffset], &_dyldCacheSymbolOverridePool[0], grp->symbolOverrideTableCount * sizeof(binary_format::DyldCacheOverride)); memcpy(&buffer[grp->imageOverrideTableOffset], &_imageOverridePool[0], grp->imageOverrideTableCount * sizeof(binary_format::ImageRefOverride)); memcpy(&buffer[grp->dofOffsetPoolOffset], &_dofOffsets[0], grp->dofOffsetPoolCount * sizeof(uint32_t)); memcpy(&buffer[grp->indirectGroupNumPoolOffset], &_indirectGroupNumPool[0], grp->indirectGroupNumPoolCount * sizeof(uint32_t)); memcpy(&buffer[grp->stringsPoolOffset], &_stringPool[0], grp->stringsPoolSize); } // now that we have a real ImageGroup, we can analyze it to find max load counts for each image ImageGroup imGroup(grp); std::unordered_set<const BinaryImageData*> allDependents; STACK_ALLOC_DYNARRAY(const binary_format::ImageGroup*, curGroups.size()+1, newGroupList); for (int i=0; i < curGroups.size(); ++i) newGroupList[i] = curGroups[i]; newGroupList[newGroupList.count()-1] = grp; for (uint32_t i=0; i < grp->imagesPoolCount; ++i) { Image image = imGroup.image(i); if ( image.isInvalid() ) continue; allDependents.clear(); allDependents.insert(image.binaryData()); BinaryImageData* imageData = (BinaryImageData*)(buffer + grp->imagesPoolOffset + (i * grp->imagesEntrySize)); if ( !image.recurseAllDependentImages(newGroupList, allDependents) ) { //diag.warning("%s dependents on an invalid dylib", image.path()); imageData->isInvalid = true; } imageData->maxLoadCount = (uint32_t)allDependents.size(); } } uint32_t ImageGroupWriter::maxLoadCount(Diagnostics& diag, const std::vector<const BinaryImageGroupData*>& curGroups, binary_format::ImageGroup* grp) const { ImageGroup imGroup(grp); std::unordered_set<const BinaryImageData*> allDependents; std::vector<const BinaryImageGroupData*> allGroups = curGroups; if ( grp->groupNum == 2 ) allGroups.push_back(grp); DynArray<const binary_format::ImageGroup*> groupList(allGroups); for (uint32_t i=0; i < grp->imagesPoolCount; ++i) { Image image = imGroup.image(i); if ( image.isInvalid() ) continue; allDependents.insert(image.binaryData()); BinaryImageData* imageData = (BinaryImageData*)((char*)grp + grp->imagesPoolOffset + (i * grp->imagesEntrySize)); if ( !image.recurseAllDependentImages(groupList, allDependents) ) { //diag.warning("%s dependents on an invalid dylib", image.path()); imageData->isInvalid = true; } } return (uint32_t)allDependents.size(); } void ImageGroupWriter::setImageCount(uint32_t count) { if ( _isDiskImage ) { _diskImages.resize(count); bzero(&_diskImages[0], count*sizeof(binary_format::DiskImage)); } else { _images.resize(count); bzero(&_images[0], count*sizeof(binary_format::CachedImage)); } int32_t offset = 0 - (int32_t)sizeof(binary_format::ImageGroup); for (uint32_t i=0; i < count; ++i) { binary_format::Image& img = imageByIndex(i); img.isDiskImage = _isDiskImage; img.has16KBpages = (_pageSize == 0x4000); img.groupOffset = offset; if ( _isDiskImage ) offset -= sizeof(binary_format::DiskImage); else offset -= sizeof(binary_format::CachedImage); } } uint32_t ImageGroupWriter::imageCount() const { if ( _isDiskImage ) return (uint32_t)_diskImages.size(); else return (uint32_t)_images.size(); } binary_format::Image& ImageGroupWriter::imageByIndex(uint32_t imageIndex) { assert(imageIndex < imageCount()); if ( _isDiskImage ) return _diskImages[imageIndex]; else return _images[imageIndex]; } const binary_format::Image& ImageGroupWriter::imageByIndex(uint32_t imageIndex) const { assert(imageIndex < imageCount()); if ( _isDiskImage ) return _diskImages[imageIndex]; else return _images[imageIndex]; } bool ImageGroupWriter::isInvalid(uint32_t imageIndex) const { return imageByIndex(imageIndex).isInvalid; } void ImageGroupWriter::setImageInvalid(uint32_t imageIndex) { imageByIndex(imageIndex).isInvalid = true; } uint32_t ImageGroupWriter::addIndirectGroupNum(uint32_t groupNum) { auto pos = _indirectGroupNumPoolExisting.find(groupNum); if ( pos != _indirectGroupNumPoolExisting.end() ) return pos->second; uint32_t startOffset = (uint32_t)_indirectGroupNumPool.size(); _indirectGroupNumPool.push_back(groupNum); _indirectGroupNumPoolExisting[startOffset] = groupNum; return startOffset; } uint32_t ImageGroupWriter::addString(const char* str) { auto pos = _stringPoolExisting.find(str); if ( pos != _stringPoolExisting.end() ) return pos->second; uint32_t startOffset = (uint32_t)_stringPool.size(); size_t size = strlen(str) + 1; _stringPool.insert(_stringPool.end(), str, &str[size]); _stringPoolExisting[str] = startOffset; return startOffset; } void ImageGroupWriter::alignStringPool() { while ( (_stringPool.size() % 4) != 0 ) _stringPool.push_back('\0'); } void ImageGroupWriter::setImagePath(uint32_t imageIndex, const char* path) { binary_format::Image& image = imageByIndex(imageIndex); image.pathPoolOffset = addString(path); image.pathHash = ImageGroup::hashFunction(path); } void ImageGroupWriter::addImageAliasPath(uint32_t imageIndex, const char* anAlias) { binary_format::AliasEntry entry; entry.aliasHash = ImageGroup::hashFunction(anAlias); entry.imageIndexInGroup = imageIndex; entry.aliasOffsetInStringPool = addString(anAlias); _aliases.push_back(entry); } void ImageGroupWriter::ImageGroupWriter::setImageUUID(uint32_t imageIndex, const uuid_t uuid) { memcpy(imageByIndex(imageIndex).uuid, uuid, sizeof(uuid_t)); } void ImageGroupWriter::setImageHasObjC(uint32_t imageIndex, bool value) { imageByIndex(imageIndex).hasObjC = value; } void ImageGroupWriter::setImageIsBundle(uint32_t imageIndex, bool value) { imageByIndex(imageIndex).isBundle = value; } void ImageGroupWriter::setImageHasWeakDefs(uint32_t imageIndex, bool value) { imageByIndex(imageIndex).hasWeakDefs = value; } void ImageGroupWriter::setImageMayHavePlusLoads(uint32_t imageIndex, bool value) { imageByIndex(imageIndex).mayHavePlusLoads = value; } void ImageGroupWriter::setImageNeverUnload(uint32_t imageIndex, bool value) { imageByIndex(imageIndex).neverUnload = value; } void ImageGroupWriter::setImageMustBeThisDir(uint32_t imageIndex, bool value) { imageByIndex(imageIndex).cwdSameAsThis = value; } void ImageGroupWriter::setImageIsPlatformBinary(uint32_t imageIndex, bool value) { imageByIndex(imageIndex).isPlatformBinary = value; } void ImageGroupWriter::setImageOverridableDylib(uint32_t imageIndex, bool value) { imageByIndex(imageIndex).overridableDylib = value; } void ImageGroupWriter::setImageFileMtimeAndInode(uint32_t imageIndex, uint64_t mTime, uint64_t inode) { imageByIndex(imageIndex).fileInfo.statInfo.mtime = mTime; imageByIndex(imageIndex).fileInfo.statInfo.inode = inode; assert(!_imageFileInfoIsCdHash); } void ImageGroupWriter::setImageCdHash(uint32_t imageIndex, uint8_t cdHash[20]) { memcpy(imageByIndex(imageIndex).fileInfo.cdHash16.bytes, cdHash, 16); assert(_imageFileInfoIsCdHash); } void ImageGroupWriter::setImageIsEncrypted(uint32_t imageIndex, bool value) { imageByIndex(imageIndex).isEncrypted = value; } void ImageGroupWriter::setImageMaxLoadCount(uint32_t imageIndex, uint32_t count) { imageByIndex(imageIndex).maxLoadCount = count; } void ImageGroupWriter::setImageFairPlayRange(uint32_t imageIndex, uint32_t offset, uint32_t size) { assert(imageIndex < imageCount()); assert(_isDiskImage); binary_format::DiskImage& image = _diskImages[imageIndex]; if ( image.has16KBpages ) { assert((offset & 0x3FFF) == 0); assert((size & 0x3FFF) == 0); } else { assert((offset & 0xFFF) == 0); assert((size & 0xFFF) == 0); } assert(offset < (_pageSize*16)); image.fairPlayTextStartPage = offset / _pageSize; image.fairPlayTextPageCount = size / _pageSize; } void ImageGroupWriter::setImageInitializerOffsets(uint32_t imageIndex, const std::vector<uint32_t>& offsets) { binary_format::Image& image = imageByIndex(imageIndex); image.initOffsetsArrayStartIndex = _initializerOffsets.size(); image.initOffsetsArrayCount = offsets.size(); _initializerOffsets.insert(_initializerOffsets.end(), offsets.begin(), offsets.end()); } void ImageGroupWriter::setImageDOFOffsets(uint32_t imageIndex, const std::vector<uint32_t>& offsets) { binary_format::Image& image = imageByIndex(imageIndex); image.dofOffsetsArrayStartIndex = _dofOffsets.size(); image.dofOffsetsArrayCount = offsets.size(); _dofOffsets.insert(_dofOffsets.end(), offsets.begin(), offsets.end()); } uint32_t ImageGroupWriter::addUniqueInitList(const std::vector<binary_format::ImageRef>& initBefore) { // see if this initBefore list already exists in pool if ( _initializerBeforeLists.size() > initBefore.size() ) { size_t cmpLen = initBefore.size()*sizeof(binary_format::ImageRef); size_t end = _initializerBeforeLists.size() - initBefore.size(); for (uint32_t i=0; i < end; ++i) { if ( memcmp(&initBefore[0], &_initializerBeforeLists[i], cmpLen) == 0 ) { return i; } } } uint32_t result = (uint32_t)_initializerBeforeLists.size(); _initializerBeforeLists.insert(_initializerBeforeLists.end(), initBefore.begin(), initBefore.end()); return result; } void ImageGroupWriter::setImageInitBefore(uint32_t imageIndex, const std::vector<binary_format::ImageRef>& initBefore) { binary_format::Image& image = imageByIndex(imageIndex); image.initBeforeArrayStartIndex = addUniqueInitList(initBefore); image.initBeforeArrayCount = initBefore.size(); } void ImageGroupWriter::setImageSliceOffset(uint32_t imageIndex, uint64_t fileOffset) { assert(imageIndex < imageCount()); assert(_isDiskImage); binary_format::DiskImage& image = _diskImages[imageIndex]; image.sliceOffsetIn4K = (uint32_t)(fileOffset / 4096); } void ImageGroupWriter::setImageCodeSignatureLocation(uint32_t imageIndex, uint32_t fileOffset, uint32_t size) { assert(imageIndex < imageCount()); assert(_isDiskImage); binary_format::DiskImage& image = _diskImages[imageIndex]; image.codeSignFileOffset = fileOffset; image.codeSignFileSize = size; } void ImageGroupWriter::setImageDependentsCount(uint32_t imageIndex, uint32_t count) { binary_format::Image& image = imageByIndex(imageIndex); image.dependentsArrayStartIndex = _dependentsPool.size(); image.dependentsArrayCount = count; _dependentsPool.resize(_dependentsPool.size() + count); } void ImageGroupWriter::setImageDependent(uint32_t imageIndex, uint32_t depIndex, binary_format::ImageRef dependent) { binary_format::Image& image = imageByIndex(imageIndex); assert(depIndex < image.dependentsArrayCount); _dependentsPool[image.dependentsArrayStartIndex + depIndex] = dependent; } uint32_t ImageGroupWriter::imageDependentsCount(uint32_t imageIndex) const { return imageByIndex(imageIndex).dependentsArrayCount; } binary_format::ImageRef ImageGroupWriter::imageDependent(uint32_t imageIndex, uint32_t depIndex) const { const binary_format::Image& image = imageByIndex(imageIndex); assert(depIndex < image.dependentsArrayCount); return _dependentsPool[image.dependentsArrayStartIndex + depIndex]; } void ImageGroupWriter::setImageSegments(uint32_t imageIndex, MachOParser& imageParser, uint64_t cacheUnslideBaseAddress) { if ( _isDiskImage ) { __block uint32_t totalPageCount = 0; __block uint32_t lastFileOffsetEnd = 0; __block uint64_t lastVmAddrEnd = 0; __block std::vector<binary_format::DiskSegment> diskSegments; diskSegments.reserve(8); imageParser.forEachSegment(^(const char* segName, uint32_t fileOffset, uint32_t fileSize, uint64_t vmAddr, uint64_t vmSize, uint8_t protections, bool& stop) { if ( (fileOffset != 0) && (fileOffset != lastFileOffsetEnd) ) { binary_format::DiskSegment filePadding; filePadding.filePageCount = (fileOffset - lastFileOffsetEnd)/_pageSize; filePadding.vmPageCount = 0; filePadding.permissions = 0; filePadding.paddingNotSeg = 1; diskSegments.push_back(filePadding); } if ( (lastVmAddrEnd != 0) && (vmAddr != lastVmAddrEnd) ) { binary_format::DiskSegment vmPadding; vmPadding.filePageCount = 0; vmPadding.vmPageCount = (vmAddr - lastVmAddrEnd)/_pageSize; vmPadding.permissions = 0; vmPadding.paddingNotSeg = 1; diskSegments.push_back(vmPadding); totalPageCount += vmPadding.vmPageCount; } { binary_format::DiskSegment segInfo; segInfo.filePageCount = (fileSize+_pageSize-1)/_pageSize; segInfo.vmPageCount = (vmSize+_pageSize-1)/_pageSize; segInfo.permissions = protections & 7; segInfo.paddingNotSeg = 0; diskSegments.push_back(segInfo); totalPageCount += segInfo.vmPageCount; if ( fileSize != 0 ) lastFileOffsetEnd = fileOffset + fileSize; if ( vmSize != 0 ) lastVmAddrEnd = vmAddr + vmSize; } }); binary_format::Image& image = imageByIndex(imageIndex); image.segmentsArrayStartIndex = _segmentPool.size(); image.segmentsArrayCount = diskSegments.size(); _segmentPool.insert(_segmentPool.end(), (uint64_t*)&diskSegments[0], (uint64_t*)&diskSegments[image.segmentsArrayCount]); _diskImages[imageIndex].totalVmPages = totalPageCount; } else { binary_format::Image& image = imageByIndex(imageIndex); image.segmentsArrayStartIndex = _segmentPool.size(); image.segmentsArrayCount = imageParser.segmentCount(); _segmentPool.resize(_segmentPool.size() + image.segmentsArrayCount); __block uint32_t segIndex = 0; imageParser.forEachSegment(^(const char* segName, uint32_t fileOffset, uint32_t fileSize, uint64_t vmAddr, uint64_t vmSize, uint8_t protections, bool& stop) { binary_format::DyldCacheSegment seg = { (uint32_t)(vmAddr-cacheUnslideBaseAddress), (uint32_t)vmSize, protections }; _segmentPool[image.segmentsArrayStartIndex + segIndex] = *((uint64_t*)&seg); ++segIndex; }); } } void ImageGroupWriter::setImagePatchLocations(uint32_t imageIndex, uint32_t funcVmOffset, const std::unordered_set<uint32_t>& patchLocations) { assert(imageIndex < imageCount()); binary_format::CachedImage& image = _images[imageIndex]; if ( image.patchStartIndex == 0 ) { image.patchStartIndex = (uint32_t)_patchPool.size(); image.patchCount = 0; } else { assert(image.patchStartIndex + image.patchCount == _patchPool.size()); } binary_format::PatchTable entry = { funcVmOffset, (uint32_t)_patchLocationPool.size() }; for (uint32_t loc : patchLocations) { _patchLocationPool.push_back(*((binary_format::PatchOffset*)&loc)); } _patchLocationPool.back().last = true; _patchPool.push_back(entry); _images[imageIndex].patchCount++; } void ImageGroupWriter::setGroupCacheOverrides(const std::vector<binary_format::DyldCacheOverride>& cacheOverrides) { _dyldCacheSymbolOverridePool = cacheOverrides; } void ImageGroupWriter::addImageIsOverride(binary_format::ImageRef standardDylibRef, binary_format::ImageRef overrideDylibRef) { _imageOverridePool.push_back({standardDylibRef, overrideDylibRef}); } class SegmentFixUpBuilder { public: SegmentFixUpBuilder(uint32_t segIndex, uint32_t dataSegPageCount, uint32_t pageSize, bool is64, const std::vector<ImageGroupWriter::FixUp>& fixups, std::vector<TargetSymbolValue>& targetsForImage, bool log); bool hasFixups() { return _hasFixups; } uint32_t segIndex() { return _segIndex; } void appendSegmentFixUpMap(ContentBuffer&); private: struct TmpOpcode { binary_format::FixUpOpcode op; uint8_t repeatOpcodeCount; uint16_t count; bool operator!=(const TmpOpcode& rhs) const { return ((op != rhs.op) || (count != rhs.count) || (repeatOpcodeCount != rhs.repeatOpcodeCount)); } }; ContentBuffer makeFixupOpcodesForPage(uint32_t pageStartSegmentOffset, const ImageGroupWriter::FixUp* start, const ImageGroupWriter::FixUp* end); uint32_t getOrdinalForTarget(TargetSymbolValue); void expandOpcodes(const std::vector<TmpOpcode>& opcodes, uint8_t page[0x4000], uint32_t& offset, uint32_t& ordinal); void expandOpcodes(const std::vector<TmpOpcode>& opcodes, uint8_t page[0x4000]); bool samePageContent(const uint8_t page1[], const uint8_t page2[]); void printOpcodes(const char* prefix, const std::vector<TmpOpcode> opcodes); void printOpcodes(const char* prefix, bool printOffset, const TmpOpcode opcodes[], size_t opcodesLen, uint32_t& offset); uint32_t opcodeEncodingSize(const std::vector<TmpOpcode>& opcodes); const bool _is64; const bool _log; bool _hasFixups; const uint32_t _segIndex; const uint32_t _dataSegPageCount; const uint32_t _pageSize; std::vector<TargetSymbolValue>& _targets; std::vector<ContentBuffer> _opcodesByPage; }; SegmentFixUpBuilder::SegmentFixUpBuilder(uint32_t segIndex, uint32_t segPageCount, uint32_t pageSize, bool is64, const std::vector<ImageGroupWriter::FixUp>& fixups, std::vector<TargetSymbolValue>& targetsForImage, bool log) : _is64(is64), _log(log), _hasFixups(false), _segIndex(segIndex), _dataSegPageCount(segPageCount), _pageSize(pageSize), _targets(targetsForImage) { //fprintf(stderr, "SegmentFixUpBuilder(segIndex=%d, segPageCount=%d)\n", segIndex, segPageCount); _targets.push_back(TargetSymbolValue::makeInvalid()); // ordinal zero reserved to mean "add slide" _opcodesByPage.resize(segPageCount); size_t startFixupIndex = 0; for (uint32_t pageIndex=0; pageIndex < segPageCount; ++pageIndex) { uint32_t pageStartOffset = pageIndex*_pageSize; uint32_t pageEndOffset = pageStartOffset+_pageSize; // find first index in this page while ( (startFixupIndex < fixups.size()) && ((fixups[startFixupIndex].segIndex != segIndex) || (fixups[startFixupIndex].segOffset < pageStartOffset)) ) ++startFixupIndex; // find first index beyond this page size_t endFixupIndex = startFixupIndex; while ( (endFixupIndex < fixups.size()) && (fixups[endFixupIndex].segIndex == segIndex) && (fixups[endFixupIndex].segOffset < pageEndOffset) ) ++endFixupIndex; // create opcodes for fixups on this pageb _opcodesByPage[pageIndex] = makeFixupOpcodesForPage(pageStartOffset, &fixups[startFixupIndex], &fixups[endFixupIndex]); startFixupIndex = endFixupIndex; } } uint32_t SegmentFixUpBuilder::getOrdinalForTarget(TargetSymbolValue target) { uint32_t ordinal = 0; for (const TargetSymbolValue& entry : _targets) { if ( entry == target ) return ordinal; ++ordinal; } _targets.push_back(target); return ordinal; } void SegmentFixUpBuilder::appendSegmentFixUpMap(ContentBuffer& buffer) { std::vector<uint32_t> offsets; uint32_t curOffset = sizeof(binary_format::SegmentFixupsByPage)-4 + _dataSegPageCount*4; for (auto& opcodes : _opcodesByPage) { if ( opcodes.size() == 0 ) offsets.push_back(0); else offsets.push_back(curOffset); curOffset += opcodes.size(); } uint32_t totalSize = curOffset; // write header buffer.append_uint32(totalSize); // SegmentFixupsByPage.size buffer.append_uint32(_pageSize); // SegmentFixupsByPage.pageSize buffer.append_uint32(_dataSegPageCount); // SegmentFixupsByPage.pageCount for (uint32_t i=0; i < _dataSegPageCount; ++i) { buffer.append_uint32(offsets[i]); // SegmentFixupsByPage.pageInfoOffsets[i] } // write each page's opcode stream for (uint32_t i=0; i < offsets.size(); ++i) { buffer.append_buffer(_opcodesByPage[i]); } } void SegmentFixUpBuilder::expandOpcodes(const std::vector<TmpOpcode>& opcodes, uint8_t page[]) { uint32_t offset = 0; uint32_t ordinal = 0; bzero(page, _pageSize); expandOpcodes(opcodes, page, offset, ordinal); } void SegmentFixUpBuilder::expandOpcodes(const std::vector<TmpOpcode>& opcodes, uint8_t page[], uint32_t& offset, uint32_t& ordinal) { for (int i=0; i < opcodes.size(); ++i) { assert(offset < _pageSize); TmpOpcode tmp = opcodes[i]; switch ( tmp.op ) { case binary_format::FixUpOpcode::bind64: *(uint64_t*)(&page[offset]) = ordinal; offset += 8; break; case binary_format::FixUpOpcode::bind32: *(uint32_t*)(&page[offset]) = ordinal; offset += 4; break; case binary_format::FixUpOpcode::rebase64: *(uint64_t*)(&page[offset]) = 0x1122334455667788; offset += 8; break; case binary_format::FixUpOpcode::rebase32: *(uint32_t*)(&page[offset]) = 0x23452345; offset += 4; break; case binary_format::FixUpOpcode::rebaseText32: *(uint32_t*)(&page[offset]) = 0x56785678; offset += 4; break; case binary_format::FixUpOpcode::bindText32: *(uint32_t*)(&page[offset]) = 0x98769876; offset += 4; break; case binary_format::FixUpOpcode::bindTextRel32: *(uint32_t*)(&page[offset]) = 0x34563456; offset += 4; break; case binary_format::FixUpOpcode::bindImportJmp32: *(uint32_t*)(&page[offset]) = 0x44556677; offset += 4; break; case binary_format::FixUpOpcode::done: break; case binary_format::FixUpOpcode::setPageOffset: offset = tmp.count; break; case binary_format::FixUpOpcode::incPageOffset: offset += (tmp.count*4); break; case binary_format::FixUpOpcode::setOrdinal: ordinal = tmp.count; break; case binary_format::FixUpOpcode::incOrdinal: ++ordinal; break; case binary_format::FixUpOpcode::repeat: { std::vector<TmpOpcode> pattern; for (int j=0; j < tmp.repeatOpcodeCount; ++j) { pattern.push_back(opcodes[i+j+1]); } for (int j=0; j < tmp.count; ++j) { expandOpcodes(pattern, page, offset, ordinal); } i += tmp.repeatOpcodeCount; } break; } } } uint32_t SegmentFixUpBuilder::opcodeEncodingSize(const std::vector<TmpOpcode>& opcodes) { uint32_t size = 0; for (int i=0; i < opcodes.size(); ++i) { switch ( opcodes[i].op ) { case binary_format::FixUpOpcode::bind64: case binary_format::FixUpOpcode::bind32: case binary_format::FixUpOpcode::rebase64: case binary_format::FixUpOpcode::rebase32: case binary_format::FixUpOpcode::rebaseText32: case binary_format::FixUpOpcode::bindText32: case binary_format::FixUpOpcode::bindTextRel32: case binary_format::FixUpOpcode::bindImportJmp32: case binary_format::FixUpOpcode::done: ++size; break; case binary_format::FixUpOpcode::setPageOffset: case binary_format::FixUpOpcode::incPageOffset: case binary_format::FixUpOpcode::setOrdinal: case binary_format::FixUpOpcode::incOrdinal: ++size; if ( opcodes[i].count >= 16 ) size += ContentBuffer::uleb128_size(opcodes[i].count); break; case binary_format::FixUpOpcode::repeat: { ++size; size += ContentBuffer::uleb128_size(opcodes[i].count); std::vector<TmpOpcode> pattern; for (int j=0; j < opcodes[i].repeatOpcodeCount; ++j) { pattern.push_back(opcodes[++i]); } size += opcodeEncodingSize(pattern); } break; } } return size; } bool SegmentFixUpBuilder::samePageContent(const uint8_t page1[], const uint8_t page2[]) { bool result = true; if (memcmp(page1, page2, _pageSize) != 0) { if ( _is64 ) { const uint64_t* p1 = (uint64_t* )page1; const uint64_t* p2 = (uint64_t* )page2; for (int i=0; i < _pageSize/8; ++i) { if ( p1[i] != p2[i] ) { fprintf(stderr, "page1[0x%03X] = 0x%016llX, page2[0x%03X] = 0x%016llX\n", i*8, p1[i], i*8, p2[i]); result = false; } } } else { const uint32_t* p1 = (uint32_t* )page1; const uint32_t* p2 = (uint32_t* )page2; for (int i=0; i < _pageSize/4; ++i) { if ( p1[i] != p2[i] ) { fprintf(stderr, "page1[0x%03X] = 0x%016X, page2[0x%03X] = 0x%016X\n", i*4, p1[i], i*4, p2[i]); result = false; } } } } return result; } void SegmentFixUpBuilder::printOpcodes(const char* prefix, const std::vector<TmpOpcode> opcodes) { uint32_t offset = 0; printOpcodes(prefix, true, &opcodes[0], opcodes.size(), offset); } void SegmentFixUpBuilder::printOpcodes(const char* prefix, bool printOffset, const TmpOpcode opcodes[], size_t opcodesLen, uint32_t& offset) { for (int i=0; i < opcodesLen; ++i) { TmpOpcode tmp = opcodes[i]; if ( printOffset ) fprintf(stderr, "%s offset=0x%04X: ", prefix, offset); else fprintf(stderr, "%s ", prefix); switch ( tmp.op ) { case binary_format::FixUpOpcode::bind64: fprintf(stderr, "bind64\n"); offset += 8; break; case binary_format::FixUpOpcode::bind32: fprintf(stderr, "bind32\n"); offset += 4; break; case binary_format::FixUpOpcode::rebase64: fprintf(stderr, "rebase64\n"); offset += 8; break; case binary_format::FixUpOpcode::rebase32: fprintf(stderr, "rebase32\n"); offset += 4; break; case binary_format::FixUpOpcode::rebaseText32: fprintf(stderr, "rebaseText32\n"); offset += 4; break; case binary_format::FixUpOpcode::bindText32: fprintf(stderr, "bindText32\n"); offset += 4; break; case binary_format::FixUpOpcode::bindTextRel32: fprintf(stderr, "bindTextRel32\n"); offset += 4; break; case binary_format::FixUpOpcode::bindImportJmp32: fprintf(stderr, "bindJmpRel32\n"); offset += 4; break; case binary_format::FixUpOpcode::done: fprintf(stderr, "done\n"); break; case binary_format::FixUpOpcode::setPageOffset: fprintf(stderr, "setPageOffset(%d)\n", tmp.count); offset = tmp.count; break; case binary_format::FixUpOpcode::incPageOffset: fprintf(stderr, "incPageOffset(%d)\n", tmp.count); offset += (tmp.count*4); break; case binary_format::FixUpOpcode::setOrdinal: fprintf(stderr, "setOrdinal(%d)\n", tmp.count); break; case binary_format::FixUpOpcode::incOrdinal: fprintf(stderr, "incOrdinal(%d)\n", tmp.count); break; case binary_format::FixUpOpcode::repeat: { char morePrefix[128]; strcpy(morePrefix, prefix); strcat(morePrefix, " "); uint32_t prevOffset = offset; fprintf(stderr, "repeat(%d times, next %d opcodes)\n", tmp.count, tmp.repeatOpcodeCount); printOpcodes(morePrefix, false, &opcodes[i+1], tmp.repeatOpcodeCount, offset); i += tmp.repeatOpcodeCount; uint32_t repeatDelta = (offset-prevOffset)*(tmp.count-1); offset += repeatDelta; } break; } } } ContentBuffer SegmentFixUpBuilder::makeFixupOpcodesForPage(uint32_t pageStartSegmentOffset, const ImageGroupWriter::FixUp* start, const ImageGroupWriter::FixUp* end) { //fprintf(stderr, " makeFixupOpcodesForPage(segOffset=0x%06X, startFixup=%p, endFixup=%p)\n", pageStartSegmentOffset, start, end); std::vector<TmpOpcode> tmpOpcodes; const uint32_t pointerSize = (_is64 ? 8 : 4); uint32_t offset = pageStartSegmentOffset; uint32_t ordinal = 0; const ImageGroupWriter::FixUp* lastFixup = nullptr; for (const ImageGroupWriter::FixUp* f=start; f < end; ++f) { // ignore double bind at same address (ld64 bug) if ( lastFixup && (lastFixup->segOffset == f->segOffset) ) continue; // add opcode to adjust current offset if needed if ( f->segOffset != offset ) { if ( ((f->segOffset % 4) != 0) || ((offset % 4) != 0) ) { // mis aligned pointers use bigger set opcode tmpOpcodes.push_back({binary_format::FixUpOpcode::setPageOffset, 0, (uint16_t)(f->segOffset-pageStartSegmentOffset)}); } else { uint32_t delta4 = (uint32_t)(f->segOffset - offset)/4; assert(delta4*4 < _pageSize); tmpOpcodes.push_back({binary_format::FixUpOpcode::incPageOffset, 0, (uint16_t)delta4}); } offset = (uint32_t)f->segOffset; } uint32_t nextOrd = 0; switch ( f->type ) { case ImageGroupWriter::FixupType::rebase: tmpOpcodes.push_back({_is64 ? binary_format::FixUpOpcode::rebase64 : binary_format::FixUpOpcode::rebase32, 0, 0}); offset += pointerSize; _hasFixups = true; break; case ImageGroupWriter::FixupType::pointerLazyBind: case ImageGroupWriter::FixupType::pointerBind: //assert(f->target.imageIndex == binary_format::OrdinalEntry::kImageIndexDyldSharedCache); nextOrd = getOrdinalForTarget(f->target); if ( nextOrd != ordinal ) { if ( (nextOrd > ordinal) && (nextOrd < (ordinal+31)) ) { tmpOpcodes.push_back({binary_format::FixUpOpcode::incOrdinal, 0, (uint16_t)(nextOrd-ordinal)}); } else { tmpOpcodes.push_back({binary_format::FixUpOpcode::setOrdinal, 0, (uint16_t)nextOrd}); } ordinal = nextOrd; } tmpOpcodes.push_back({_is64 ? binary_format::FixUpOpcode::bind64 : binary_format::FixUpOpcode::bind32, 0, 0}); offset += pointerSize; _hasFixups = true; break; case ImageGroupWriter::FixupType::rebaseText: assert(!_is64); tmpOpcodes.push_back({binary_format::FixUpOpcode::rebaseText32, 0, 0}); offset += pointerSize; _hasFixups = true; break; case ImageGroupWriter::FixupType::bindText: assert(!_is64); nextOrd = getOrdinalForTarget(f->target); if ( nextOrd != ordinal ) { if ( (nextOrd > ordinal) && (nextOrd < (ordinal+31)) ) { tmpOpcodes.push_back({binary_format::FixUpOpcode::incOrdinal, 0, (uint16_t)(nextOrd-ordinal)}); } else { tmpOpcodes.push_back({binary_format::FixUpOpcode::setOrdinal, 0, (uint16_t)nextOrd}); } ordinal = nextOrd; } tmpOpcodes.push_back({binary_format::FixUpOpcode::bindText32, 0, 0}); offset += pointerSize; _hasFixups = true; break; case ImageGroupWriter::FixupType::bindTextRel: assert(!_is64); nextOrd = getOrdinalForTarget(f->target); if ( nextOrd != ordinal ) { if ( (nextOrd > ordinal) && (nextOrd < (ordinal+31)) ) { tmpOpcodes.push_back({binary_format::FixUpOpcode::incOrdinal, 0, (uint16_t)(nextOrd-ordinal)}); } else { tmpOpcodes.push_back({binary_format::FixUpOpcode::setOrdinal, 0, (uint16_t)nextOrd}); } ordinal = nextOrd; } tmpOpcodes.push_back({binary_format::FixUpOpcode::bindTextRel32, 0, 0}); offset += pointerSize; _hasFixups = true; break; case ImageGroupWriter::FixupType::bindImportJmpRel: assert(!_is64); nextOrd = getOrdinalForTarget(f->target); if ( nextOrd != ordinal ) { if ( (nextOrd > ordinal) && (nextOrd < (ordinal+31)) ) { tmpOpcodes.push_back({binary_format::FixUpOpcode::incOrdinal, 0, (uint16_t)(nextOrd-ordinal)}); } else { tmpOpcodes.push_back({binary_format::FixUpOpcode::setOrdinal, 0, (uint16_t)nextOrd}); } ordinal = nextOrd; } tmpOpcodes.push_back({binary_format::FixUpOpcode::bindImportJmp32, 0, 0}); offset += pointerSize; _hasFixups = true; break; case ImageGroupWriter::FixupType::ignore: assert(0 && "ignore fixup types should have been removed"); break; } lastFixup = f; } uint8_t firstExpansion[0x4010]; // larger than 16KB to handle unaligned pointers expandOpcodes(tmpOpcodes, firstExpansion); if (_log) printOpcodes("start", tmpOpcodes); for (int stride=1; stride < 6; ++stride) { for (int i=0; i < tmpOpcodes.size(); ++i) { int j; for (j=i+stride; j < tmpOpcodes.size(); j += stride) { bool strideMatch = true; for (int k=0; k < stride; ++k) { if ( (j+k >= tmpOpcodes.size()) || (tmpOpcodes[j+k] != tmpOpcodes[i+k]) ) { strideMatch = false; break; } if ( (tmpOpcodes[j+k].op == binary_format::FixUpOpcode::repeat) && (tmpOpcodes[j+k].repeatOpcodeCount+k >= stride) ) { strideMatch = false; break; } } if ( !strideMatch ) break; } // see if same opcode repeated three or more times int repeats = (j-i)/stride; if ( repeats > 3 ) { // replace run with repeat opcode tmpOpcodes[i].op = binary_format::FixUpOpcode::repeat; tmpOpcodes[i].repeatOpcodeCount = stride; tmpOpcodes[i].count = repeats; tmpOpcodes.erase(tmpOpcodes.begin()+i+1, tmpOpcodes.begin()+j-stride); i += stride; } else { // don't look for matches inside a repeat loop if ( tmpOpcodes[i].op == binary_format::FixUpOpcode::repeat ) i += tmpOpcodes[i].repeatOpcodeCount; } } if (_log) { char tmp[32]; sprintf(tmp, "stride %d", stride); printOpcodes(tmp, tmpOpcodes); } uint8_t secondExpansion[0x4010]; expandOpcodes(tmpOpcodes, secondExpansion); if ( !samePageContent(firstExpansion, secondExpansion) ) printOpcodes("opt", tmpOpcodes); } // convert temp opcodes to real opcodes bool wroteDone = false; ContentBuffer opcodes; for (const TmpOpcode& tmp : tmpOpcodes) { switch ( tmp.op ) { case binary_format::FixUpOpcode::bind64: case binary_format::FixUpOpcode::bind32: case binary_format::FixUpOpcode::rebase64: case binary_format::FixUpOpcode::rebase32: case binary_format::FixUpOpcode::rebaseText32: case binary_format::FixUpOpcode::bindText32: case binary_format::FixUpOpcode::bindTextRel32: case binary_format::FixUpOpcode::bindImportJmp32: opcodes.append_byte((uint8_t)tmp.op); break; case binary_format::FixUpOpcode::done: opcodes.append_byte((uint8_t)tmp.op); wroteDone = true; break; case binary_format::FixUpOpcode::setPageOffset: case binary_format::FixUpOpcode::incPageOffset: case binary_format::FixUpOpcode::setOrdinal: case binary_format::FixUpOpcode::incOrdinal: if ( (tmp.count > 0) && (tmp.count < 16) ) { opcodes.append_byte((uint8_t)tmp.op | tmp.count); } else { opcodes.append_byte((uint8_t)tmp.op); opcodes.append_uleb128(tmp.count); } break; case binary_format::FixUpOpcode::repeat: { const TmpOpcode* nextOpcodes = &tmp; ++nextOpcodes; std::vector<TmpOpcode> pattern; for (int i=0; i < tmp.repeatOpcodeCount; ++i) { pattern.push_back(nextOpcodes[i]); } uint32_t repeatBytes = opcodeEncodingSize(pattern); assert(repeatBytes < 15); opcodes.append_byte((uint8_t)tmp.op | repeatBytes); opcodes.append_uleb128(tmp.count); } break; } } if ( (opcodes.size() == 0) || !wroteDone ) opcodes.append_byte((uint8_t)binary_format::FixUpOpcode::done); // make opcodes streams 4-byte aligned opcodes.pad_to_size(4); //fprintf(stderr, " makeFixupOpcodesForPage(pageStartSegmentOffset=0x%0X) result=%lu bytes\n", pageStartSegmentOffset, opcodes.size()); return opcodes; } void ImageGroupWriter::setImageFixups(Diagnostics& diag, uint32_t imageIndex, std::vector<FixUp>& fixups, bool hasTextRelocs) { // only applicable for ImageGroup in a closure (not group of images in dyld cache) assert(_isDiskImage); // sort all rebases and binds by address std::sort(fixups.begin(), fixups.end(), [](FixUp& lhs, FixUp& rhs) -> bool { if ( &lhs == &rhs ) return false; // sort by segIndex if ( lhs.segIndex < rhs.segIndex ) return true; if ( lhs.segIndex > rhs.segIndex ) return false; // then sort by segOffset if ( lhs.segOffset < rhs.segOffset ) return true; if ( lhs.segOffset > rhs.segOffset ) return false; // two fixups at same location // if the same (linker bug), ignore one if ( lhs.type == rhs.type ) { rhs.type = FixupType::ignore; } // if one is rebase for lazy pointer, ignore rebase because dyld3 does not lazy bind else if ( (lhs.type == FixupType::pointerLazyBind) && (rhs.type == FixupType::rebase) ) { // lazy pointers have rebase and (lazy) bind at same location. since dyld3 does not do lazy binding, we mark the rebase to be ignored later rhs.type = FixupType::ignore; } else if ( (rhs.type == FixupType::pointerLazyBind) && (lhs.type == FixupType::rebase) ) { // lazy pointers have rebase and (lazy) bind at same location. since dyld3 does not do lazy binding, we mark the rebase to be ignored later lhs.type = FixupType::ignore; } return (lhs.type < rhs.type); }); // remove ignoreable fixups fixups.erase(std::remove_if(fixups.begin(), fixups.end(), [&](const FixUp& a) { return (a.type == FixupType::ignore); }), fixups.end()); // look for overlapping fixups const uint32_t pointerSize = (_is64 ? 8 : 4); const FixUp* lastFixup = nullptr; for (const FixUp& fixup : fixups) { if ( lastFixup != nullptr ) { if ( lastFixup->segIndex == fixup.segIndex ) { uint64_t increment = fixup.segOffset - lastFixup->segOffset; if ( increment < pointerSize ) { if ( (increment == 0) && ((lastFixup->type == FixupType::ignore) || (fixup.type == FixupType::ignore)) ) { // allow rebase to local lazy helper and lazy bind to same location } else { diag.error("segment %d has overlapping fixups at offset 0x%0llX and 0x%0llX", fixup.segIndex, lastFixup->segOffset, fixup.segOffset); setImageInvalid(imageIndex); return; } } } } lastFixup = &fixup; } if ( hasTextRelocs ) _diskImages[imageIndex].hasTextRelocs = true; // there is one ordinal table per image, shared by all segments with fixups in that image std::vector<TargetSymbolValue> targetsForImage; const bool opcodeLogging = false; // calculate SegmentFixupsByPage for each segment std::vector<SegmentFixUpBuilder*> builders; for (uint32_t segIndex=0, onDiskSegIndex=0; segIndex < _diskImages[imageIndex].segmentsArrayCount; ++segIndex) { const binary_format::DiskSegment* diskSeg = (const binary_format::DiskSegment*)&(_segmentPool[_diskImages[imageIndex].segmentsArrayStartIndex+segIndex]); SegmentFixUpBuilder* builder = nullptr; if ( diskSeg->paddingNotSeg ) continue; if ( diskSeg->filePageCount == 0 ) { ++onDiskSegIndex; continue; } if ( diskSeg->permissions & VM_PROT_WRITE ) { builder = new SegmentFixUpBuilder(onDiskSegIndex, diskSeg->filePageCount, _pageSize, _is64, fixups, targetsForImage, opcodeLogging); } else if ( hasTextRelocs && (diskSeg->permissions == (VM_PROT_READ|VM_PROT_EXECUTE)) ) { builder = new SegmentFixUpBuilder(onDiskSegIndex, diskSeg->filePageCount, _pageSize, _is64, fixups, targetsForImage, opcodeLogging); } if ( builder != nullptr ) { if ( builder->hasFixups() ) builders.push_back(builder); else delete builder; } ++onDiskSegIndex; } // build AllFixupsBySegment for image _fixupsPool.pad_to_size(4); uint32_t startOfFixupsOffset = (uint32_t)_fixupsPool.size(); size_t headerSize = builders.size() * sizeof(binary_format::AllFixupsBySegment); size_t offsetOfSegmentHeaderInBuffer = _fixupsPool.size(); for (int i=0; i < headerSize; ++i) { _fixupsPool.append_byte(0); } uint32_t entryIndex = 0; for (SegmentFixUpBuilder* builder : builders) { binary_format::AllFixupsBySegment* entries = (binary_format::AllFixupsBySegment*)(_fixupsPool.start()+offsetOfSegmentHeaderInBuffer); entries[entryIndex].segIndex = builder->segIndex(); entries[entryIndex].offset = (uint32_t)_fixupsPool.size() - startOfFixupsOffset; builder->appendSegmentFixUpMap(_fixupsPool); delete builder; ++entryIndex; } _diskImages[imageIndex].fixupsPoolOffset = (uint32_t)offsetOfSegmentHeaderInBuffer; _diskImages[imageIndex].fixupsPoolSegCount = entryIndex; // append targetsForImage into group size_t start = _targetsPool.size(); size_t count = targetsForImage.size(); _diskImages[imageIndex].targetsArrayStartIndex = (uint32_t)start; _diskImages[imageIndex].targetsArrayCount = (uint32_t)count; assert(_diskImages[imageIndex].targetsArrayStartIndex == start); assert(_diskImages[imageIndex].targetsArrayCount == count); _targetsPool.insert(_targetsPool.end(), targetsForImage.begin(), targetsForImage.end()); } } } |