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--- dyld/dyld-750.5/dyld3/shared-cache/DyldSharedCache.cpp
+++ dyld/dyld-852.2/dyld3/shared-cache/DyldSharedCache.cpp
@@ -59,6 +59,10 @@
#include <sstream>
#endif
+#if (BUILDING_LIBDYLD || BUILDING_DYLD)
+VIS_HIDDEN bool gEnableSharedCacheDataConst = false;
+#endif
+
#if BUILDING_CACHE_BUILDER
DyldSharedCache::CreateResults DyldSharedCache::create(const CreateOptions& options,
@@ -115,7 +119,7 @@
bool DyldSharedCache::verifySelfContained(std::vector<MappedMachO>& dylibsToCache,
std::unordered_set<std::string>& badZippered,
- MappedMachO (^loader)(const std::string& runtimePath),
+ MappedMachO (^loader)(const std::string& runtimePath, Diagnostics& diag),
std::vector<std::pair<DyldSharedCache::MappedMachO, std::set<std::string>>>& rejected)
{
// build map of dylibs
@@ -132,6 +136,7 @@
}
// check all dependencies to assure every dylib in cache only depends on other dylibs in cache
+ __block std::set<std::string> missingWeakDylibs;
__block bool doAgain = true;
while ( doAgain ) {
__block std::vector<DyldSharedCache::MappedMachO> foundMappings;
@@ -141,6 +146,8 @@
if ( badDylibs.count(dylib.runtimePath) != 0 )
continue;
dylib.mh->forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) {
+ if ( isWeak && (missingWeakDylibs.count(loadPath) != 0) )
+ return;
if ( knownDylibs.count(loadPath) == 0 ) {
doAgain = true;
if ( badZippered.count(loadPath) != 0 ) {
@@ -151,11 +158,24 @@
badZippered.insert(dylib.mh->installName());
return;
}
+ Diagnostics diag;
MappedMachO foundMapping;
if ( badDylibs.count(loadPath) == 0 )
- foundMapping = loader(loadPath);
+ foundMapping = loader(loadPath, diag);
if ( foundMapping.length == 0 ) {
- badDylibs[dylib.runtimePath].insert(std::string("Could not find dependency '") + loadPath +"'");
+ // We allow weakly linked dylibs to be missing only if they are not present on disk
+ // The shared cache doesn't contain enough information to patch them in later if they are
+ // found on disk, so we don't want to pull something in to cache and cut it off from a dylib it
+ // could have used.
+ if ( isWeak ) {
+ missingWeakDylibs.insert(loadPath);
+ return;
+ }
+
+ if (diag.hasError())
+ badDylibs[dylib.runtimePath].insert(diag.errorMessage());
+ else
+ badDylibs[dylib.runtimePath].insert(std::string("Could not find dependency '") + loadPath +"'");
knownDylibs.erase(dylib.runtimePath);
knownDylibs.erase(dylib.mh->installName());
}
@@ -209,7 +229,14 @@
return (const T)(addr + slide);
}
-void DyldSharedCache::forEachRegion(void (^handler)(const void* content, uint64_t vmAddr, uint64_t size, uint32_t permissions)) const
+uint64_t DyldSharedCache::getCodeSignAddress() const
+{
+ auto mappings = (const dyld_cache_mapping_info*)((uint8_t*)this + header.mappingOffset);
+ return mappings[header.mappingCount-1].address + mappings[header.mappingCount-1].size;
+}
+
+void DyldSharedCache::forEachRegion(void (^handler)(const void* content, uint64_t vmAddr, uint64_t size,
+ uint32_t initProt, uint32_t maxProt, uint64_t flags)) const
{
// <rdar://problem/49875993> sanity check cache header
if ( strncmp(header.magic, "dyld_v1", 7) != 0 )
@@ -218,10 +245,18 @@
return;
if ( header.mappingCount > 20 )
return;
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
- const dyld_cache_mapping_info* mappingsEnd = &mappings[header.mappingCount];
- for (const dyld_cache_mapping_info* m=mappings; m < mappingsEnd; ++m) {
- handler((char*)this + m->fileOffset, m->address, m->size, m->initProt);
+ if ( header.mappingOffset <= __offsetof(dyld_cache_header, mappingWithSlideOffset) ) {
+ const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
+ const dyld_cache_mapping_info* mappingsEnd = &mappings[header.mappingCount];
+ for (const dyld_cache_mapping_info* m=mappings; m < mappingsEnd; ++m) {
+ handler((char*)this + m->fileOffset, m->address, m->size, m->initProt, m->maxProt, 0);
+ }
+ } else {
+ const dyld_cache_mapping_and_slide_info* mappings = (const dyld_cache_mapping_and_slide_info*)((char*)this + header.mappingWithSlideOffset);
+ const dyld_cache_mapping_and_slide_info* mappingsEnd = &mappings[header.mappingCount];
+ for (const dyld_cache_mapping_and_slide_info* m=mappings; m < mappingsEnd; ++m) {
+ handler((char*)this + m->fileOffset, m->address, m->size, m->initProt, m->maxProt, m->flags);
+ }
}
}
@@ -236,7 +271,8 @@
uintptr_t unslidStart = (uintptr_t)addr - slide;
// quick out if after end of cache
- if ( unslidStart > (mappings[2].address + mappings[2].size) )
+ const dyld_cache_mapping_info* lastMapping = &mappings[header.mappingCount - 1];
+ if ( unslidStart > (lastMapping->address + lastMapping->size) )
return false;
// walk cache regions
@@ -250,6 +286,13 @@
}
return false;
+}
+
+bool DyldSharedCache::isAlias(const char* path) const {
+ const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
+ uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
+ // paths for aliases are store between cache header and first segment
+ return path < ((char*)mappings[0].address + slide);
}
void DyldSharedCache::forEachImage(void (^handler)(const mach_header* mh, const char* installName)) const
@@ -293,6 +336,62 @@
}
}
+const bool DyldSharedCache::hasLocalSymbolsInfo() const
+{
+ return (header.localSymbolsOffset != 0 && header.mappingOffset > offsetof(dyld_cache_header,localSymbolsSize));
+}
+
+const void* DyldSharedCache::getLocalNlistEntries() const
+{
+ // check for cache without local symbols info
+ if (!this->hasLocalSymbolsInfo())
+ return nullptr;
+ const auto localInfo = (dyld_cache_local_symbols_info*)((uint8_t*)this + header.localSymbolsOffset);
+ return (uint8_t*)localInfo + localInfo->nlistOffset;
+}
+
+const uint32_t DyldSharedCache::getLocalNlistCount() const
+{
+ // check for cache without local symbols info
+ if (!this->hasLocalSymbolsInfo())
+ return 0;
+ const auto localInfo = (dyld_cache_local_symbols_info*)((uint8_t*)this + header.localSymbolsOffset);
+ return localInfo->nlistCount;
+}
+
+const char* DyldSharedCache::getLocalStrings() const
+{
+ // check for cache without local symbols info
+ if (!this->hasLocalSymbolsInfo())
+ return nullptr;
+ const auto localInfo = (dyld_cache_local_symbols_info*)((uint8_t*)this + header.localSymbolsOffset);
+ return (char*)localInfo + localInfo->stringsOffset;
+}
+
+const uint32_t DyldSharedCache::getLocalStringsSize() const
+{
+ // check for cache without local symbols info
+ if (!this->hasLocalSymbolsInfo())
+ return 0;
+ const auto localInfo = (dyld_cache_local_symbols_info*)((uint8_t*)this + header.localSymbolsOffset);
+ return localInfo->stringsSize;
+}
+
+ void DyldSharedCache::forEachLocalSymbolEntry(void (^handler)(uint32_t dylibOffset, uint32_t nlistStartIndex, uint32_t nlistCount, bool& stop)) const
+{
+ // check for cache without local symbols info
+ if (!this->hasLocalSymbolsInfo())
+ return;
+ const auto localInfo = (dyld_cache_local_symbols_info*)((uint8_t*)this + header.localSymbolsOffset);
+ const auto localEntries = (dyld_cache_local_symbols_entry*)((uint8_t*)localInfo + localInfo->entriesOffset);
+ bool stop = false;
+ for (uint32_t i = 0; i < localInfo->entriesCount; i++) {
+ dyld_cache_local_symbols_entry localEntry = localEntries[i];
+ handler(localEntry.dylibOffset, localEntry.nlistStartIndex, localEntry.nlistCount, stop);
+ }
+}
+
+
const mach_header* DyldSharedCache::getIndexedImageEntry(uint32_t index, uint64_t& mTime, uint64_t& inode) const
{
const dyld_cache_image_info* dylibs = (dyld_cache_image_info*)((char*)this + header.imagesOffset);
@@ -302,10 +401,17 @@
return (mach_header*)((uint8_t*)this + dylibs[index].address - mappings[0].address);
}
+
+ const char* DyldSharedCache::getIndexedImagePath(uint32_t index) const
+{
+ auto dylibs = (const dyld_cache_image_info*)((char*)this + header.imagesOffset);
+ return (char*)this + dylibs[index].pathFileOffset;
+}
+
void DyldSharedCache::forEachImageTextSegment(void (^handler)(uint64_t loadAddressUnslid, uint64_t textSegmentSize, const uuid_t dylibUUID, const char* installName, bool& stop)) const
{
// check for old cache without imagesText array
- if ( header.mappingOffset < 123 )
+ if ( (header.mappingOffset <= __offsetof(dyld_cache_header, imagesTextOffset)) || (header.imagesTextCount == 0) )
return;
// walk imageText table and call callback for each entry
@@ -358,15 +464,16 @@
__block std::vector<uint64_t> regionFileOffsets;
result.reserve(256*1024);
- forEachRegion(^(const void* content, uint64_t vmAddr, uint64_t size, uint32_t permissions) {
+ forEachRegion(^(const void* content, uint64_t vmAddr, uint64_t size,
+ uint32_t initProt, uint32_t maxProt, uint64_t flags) {
regionStartAddresses.push_back(vmAddr);
regionSizes.push_back(size);
regionFileOffsets.push_back((uint8_t*)content - (uint8_t*)this);
char lineBuffer[256];
const char* prot = "RW";
- if ( permissions == (VM_PROT_EXECUTE|VM_PROT_READ) )
+ if ( maxProt == (VM_PROT_EXECUTE|VM_PROT_READ) )
prot = "EX";
- else if ( permissions == VM_PROT_READ )
+ else if ( maxProt == VM_PROT_READ )
prot = "RO";
if ( size > 1024*1024 )
sprintf(lineBuffer, "mapping %s %4lluMB 0x%0llX -> 0x%0llX\n", prot, size/(1024*1024), vmAddr, vmAddr+size);
@@ -409,7 +516,8 @@
{
__block uint64_t startAddr = 0;
__block uint64_t endAddr = 0;
- forEachRegion(^(const void* content, uint64_t vmAddr, uint64_t size, uint32_t permissions) {
+ forEachRegion(^(const void* content, uint64_t vmAddr, uint64_t size,
+ uint32_t initProt, uint32_t maxProt, uint64_t flags) {
if ( startAddr == 0 )
startAddr = vmAddr;
uint64_t end = vmAddr+size;
@@ -473,6 +581,16 @@
return false;
}
+bool DyldSharedCache::isOverridablePath(const char* dylibPath) const
+{
+ // all dylibs in customer dyld cache cannot be overridden except libdispatch.dylib
+ if ( header.cacheType == kDyldSharedCacheTypeProduction ) {
+ return (strcmp(dylibPath, "/usr/lib/system/libdispatch.dylib") == 0);
+ }
+ // in dev caches we can override all paths
+ return true;
+}
+
bool DyldSharedCache::hasNonOverridablePath(const char* dylibPath) const
{
// all dylibs in customer dyld cache cannot be overridden except libdispatch.dylib
@@ -480,18 +598,19 @@
if ( header.cacheType == kDyldSharedCacheTypeProduction ) {
uint32_t imageIndex;
pathIsInDyldCacheWhichCannotBeOverridden = this->hasImagePath(dylibPath, imageIndex);
- if ( pathIsInDyldCacheWhichCannotBeOverridden && (strcmp(dylibPath, "/usr/lib/system/libdispatch.dylib") == 0) )
+ if ( pathIsInDyldCacheWhichCannotBeOverridden && isOverridablePath(dylibPath) )
pathIsInDyldCacheWhichCannotBeOverridden = false;
}
return pathIsInDyldCacheWhichCannotBeOverridden;
}
+#if !BUILDING_LIBDSC
const dyld3::closure::Image* DyldSharedCache::findDlopenOtherImage(const char* path) const
{
const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
if ( mappings[0].fileOffset != 0 )
return nullptr;
- if ( header.mappingOffset < sizeof(dyld_cache_header) )
+ if ( header.mappingOffset < __offsetof(dyld_cache_header, otherImageArrayAddr) )
return nullptr;
if ( header.otherImageArrayAddr == 0 )
return nullptr;
@@ -511,9 +630,6 @@
return nullptr;
}
-
-
-
const dyld3::closure::LaunchClosure* DyldSharedCache::findClosure(const char* executablePath) const
{
const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
@@ -575,7 +691,23 @@
}
}
}
-#endif
+
+void DyldSharedCache::forEachDylibPath(void (^handler)(const char* dylibPath, uint32_t index)) const
+{
+ const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
+ uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
+ const uint8_t* dylibTrieStart = (uint8_t*)(this->header.dylibsTrieAddr + slide);
+ const uint8_t* dylibTrieEnd = dylibTrieStart + this->header.dylibsTrieSize;
+
+ std::vector<DylibIndexTrie::Entry> dylibEntries;
+ if ( Trie<DylibIndex>::parseTrie(dylibTrieStart, dylibTrieEnd, dylibEntries) ) {
+ for (DylibIndexTrie::Entry& entry : dylibEntries ) {
+ handler(entry.name.c_str(), entry.info.index);
+ }
+ }
+}
+#endif // !BUILDING_LIBDYLD && !BUILDING_DYLD
+#endif // !BUILDING_LIBDSC
const dyld3::closure::ImageArray* DyldSharedCache::cachedDylibsImageArray() const
{
@@ -594,7 +726,7 @@
const dyld3::closure::ImageArray* DyldSharedCache::otherOSImageArray() const
{
// check for old cache without imagesArray
- if ( header.mappingOffset < sizeof(dyld_cache_header) )
+ if ( header.mappingOffset < __offsetof(dyld_cache_header, otherImageArrayAddr) )
return nullptr;
if ( header.otherImageArrayAddr == 0 )
@@ -665,6 +797,59 @@
}
}
+#if (BUILDING_LIBDYLD || BUILDING_DYLD)
+void DyldSharedCache::changeDataConstPermissions(mach_port_t machTask, uint32_t permissions,
+ DataConstLogFunc logFunc) const {
+
+ const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
+ uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
+
+ if ( (permissions & VM_PROT_WRITE) != 0 )
+ permissions |= VM_PROT_COPY;
+
+ forEachRegion(^(const void *, uint64_t vmAddr, uint64_t size,
+ uint32_t initProt, uint32_t maxProt, uint64_t flags) {
+ void* content = (void*)(vmAddr + slide);
+ if ( ( flags & DYLD_CACHE_MAPPING_CONST_DATA) == 0 )
+ return;
+ if ( logFunc != nullptr ) {
+ logFunc("dyld: marking shared cache range 0x%x permissions: 0x%09lX -> 0x%09lX\n",
+ permissions, (long)content, (long)content + size);
+ }
+ kern_return_t result = vm_protect(machTask, (vm_address_t)content, (vm_size_t)size, false, permissions);
+ if ( result != KERN_SUCCESS ) {
+ if ( logFunc != nullptr )
+ logFunc("dyld: failed to mprotect shared cache due to: %d\n", result);
+ }
+ });
+}
+
+DyldSharedCache::DataConstLazyScopedWriter::DataConstLazyScopedWriter(const DyldSharedCache* cache, mach_port_t machTask, DataConstLogFunc logFunc)
+ : cache(cache), machTask(machTask), logFunc(logFunc) {
+}
+
+DyldSharedCache::DataConstLazyScopedWriter::~DataConstLazyScopedWriter() {
+ if ( wasMadeWritable )
+ cache->changeDataConstPermissions(machTask, VM_PROT_READ, logFunc);
+}
+
+void DyldSharedCache::DataConstLazyScopedWriter::makeWriteable() {
+ if ( wasMadeWritable )
+ return;
+ if ( !gEnableSharedCacheDataConst )
+ return;
+ if ( cache == nullptr )
+ return;
+ wasMadeWritable = true;
+ cache->changeDataConstPermissions(machTask, VM_PROT_READ | VM_PROT_WRITE, logFunc);
+}
+
+DyldSharedCache::DataConstScopedWriter::DataConstScopedWriter(const DyldSharedCache* cache, mach_port_t machTask, DataConstLogFunc logFunc)
+ : writer(cache, machTask, logFunc) {
+ writer.makeWriteable();
+}
+#endif
+
#if !(BUILDING_LIBDYLD || BUILDING_DYLD)
// MRM map file generator
std::string DyldSharedCache::generateJSONMap(const char* disposition) const {
@@ -738,25 +923,68 @@
#endif
-
-
-const dyld_cache_slide_info* DyldSharedCache::slideInfo() const
-{
+#if !(BUILDING_LIBDYLD || BUILDING_DYLD)
+dyld3::MachOAnalyzer::VMAddrConverter DyldSharedCache::makeVMAddrConverter(bool contentRebased) const {
+ typedef dyld3::MachOAnalyzer::VMAddrConverter VMAddrConverter;
+
+ __block VMAddrConverter::SharedCacheFormat pointerFormat = VMAddrConverter::SharedCacheFormat::none;
+ __block uint64_t pointerValueAdd = 0;;
+ forEachSlideInfo(^(uint64_t mappingStartAddress, uint64_t mappingSize, const uint8_t *mappingPagesStart, uint64_t slideInfoOffset, uint64_t slideInfoSize, const dyld_cache_slide_info *slideInfoHeader) {
+ assert(slideInfoHeader->version >= 2);
+ if ( slideInfoHeader->version == 2 ) {
+ const dyld_cache_slide_info2* slideInfo = (dyld_cache_slide_info2*)(slideInfoHeader);
+ assert(slideInfo->delta_mask == 0x00FFFF0000000000);
+ pointerFormat = VMAddrConverter::SharedCacheFormat::v2_x86_64_tbi;
+ pointerValueAdd = slideInfo->value_add;
+ } else if ( slideInfoHeader->version == 3 ) {
+ pointerFormat = VMAddrConverter::SharedCacheFormat::v3;
+ pointerValueAdd = unslidLoadAddress();
+ } else {
+ assert(false);
+ }
+ });
+
const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
- uint64_t offsetInLinkEditRegion = (header.slideInfoOffset - mappings[2].fileOffset);
+ VMAddrConverter vmAddrConverter;
+ vmAddrConverter.preferredLoadAddress = pointerValueAdd;
+ vmAddrConverter.slide = slide;
+ vmAddrConverter.chainedPointerFormat = 0;
+ vmAddrConverter.sharedCacheChainedPointerFormat = pointerFormat;
+ vmAddrConverter.contentRebased = contentRebased;
+
+ return vmAddrConverter;
+}
+#endif
+
+const dyld_cache_slide_info* DyldSharedCache::legacyCacheSlideInfo() const
+{
+ assert(header.mappingOffset <= __offsetof(dyld_cache_header, mappingWithSlideOffset));
+ const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
+ uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
+
+ uint64_t offsetInLinkEditRegion = (header.slideInfoOffsetUnused - mappings[2].fileOffset);
return (dyld_cache_slide_info*)((uint8_t*)(mappings[2].address) + slide + offsetInLinkEditRegion);
}
-const uint8_t* DyldSharedCache::dataRegionStart() const
-{
+const dyld_cache_mapping_info* DyldSharedCache::legacyCacheDataRegionMapping() const
+{
+ assert(header.mappingOffset <= __offsetof(dyld_cache_header, mappingWithSlideOffset));
+ const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
+ return &mappings[1];
+}
+
+const uint8_t* DyldSharedCache::legacyCacheDataRegionBuffer() const
+{
+ assert(header.mappingOffset <= __offsetof(dyld_cache_header, mappingWithSlideOffset));
const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((char*)this + header.mappingOffset);
uintptr_t slide = (uintptr_t)this - (uintptr_t)(mappings[0].address);
- return (uint8_t*)(mappings[1].address) + slide;
-}
-
+ return (uint8_t*)(legacyCacheDataRegionMapping()->address) + slide;
+}
+
+#if !BUILDING_LIBDSC
const objc_opt::objc_opt_t* DyldSharedCache::objcOpt() const {
// Find the objc image
const dyld3::MachOAnalyzer* objcMA = nullptr;
@@ -810,7 +1038,7 @@
int64_t slide = objcMA->getSlide();
uint32_t pointerSize = objcMA->pointerSize();
objcMA->forEachSection(^(const dyld3::MachOAnalyzer::SectionInfo& info, bool malformedSectionRange, bool& stop) {
- if ( strncmp(info.segInfo.segName, "__DATA", 6) != 0 )
+ if ( (strncmp(info.segInfo.segName, "__DATA", 6) != 0) && (strncmp(info.segInfo.segName, "__AUTH", 6) != 0) )
return;
if (strcmp(info.sectName, "__objc_opt_ptrs") != 0)
return;
@@ -827,6 +1055,97 @@
return objcPointersContent;
}
+#endif
+
+std::pair<const void*, uint64_t> DyldSharedCache::getObjCConstantRange() const {
+ const dyld3::MachOAnalyzer* libDyldMA = nullptr;
+ uint32_t imageIndex;
+ if ( hasImagePath("/usr/lib/system/libdyld.dylib", imageIndex) ) {
+ const dyld3::closure::ImageArray* images = cachedDylibsImageArray();
+ const dyld3::closure::Image* image = images->imageForNum(imageIndex+1);
+ libDyldMA = (const dyld3::MachOAnalyzer*)((uintptr_t)this + image->cacheOffset());
+
+ std::pair<const void*, uint64_t> ranges = { nullptr, 0 };
+#if TARGET_OS_OSX
+ ranges.first = libDyldMA->findSectionContent("__DATA", "__objc_ranges", ranges.second);
+#else
+ ranges.first = libDyldMA->findSectionContent("__DATA_CONST", "__objc_ranges", ranges.second);
+#endif
+ return ranges;
+ }
+
+ return { nullptr, 0 };
+}
+
+bool DyldSharedCache::hasSlideInfo() const {
+ if ( header.mappingOffset <= __offsetof(dyld_cache_header, mappingWithSlideOffset) ) {
+ return header.slideInfoSizeUnused != 0;
+ } else {
+ const dyld_cache_mapping_and_slide_info* slidableMappings = (const dyld_cache_mapping_and_slide_info*)((char*)this + header.mappingWithSlideOffset);
+ for (uint32_t i = 0; i != header.mappingWithSlideCount; ++i) {
+ if ( slidableMappings[i].slideInfoFileSize != 0 ) {
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+void DyldSharedCache::forEachSlideInfo(void (^handler)(uint64_t mappingStartAddress, uint64_t mappingSize,
+ const uint8_t* mappingPagesStart,
+ uint64_t slideInfoOffset, uint64_t slideInfoSize,
+ const dyld_cache_slide_info* slideInfoHeader)) const {
+ if ( header.mappingOffset <= __offsetof(dyld_cache_header, mappingWithSlideOffset) ) {
+ // Old caches should get the slide info from the cache header and assume a single data region.
+ const dyld_cache_mapping_info* dataMapping = legacyCacheDataRegionMapping();
+ uint64_t dataStartAddress = dataMapping->address;
+ uint64_t dataSize = dataMapping->size;
+ const uint8_t* dataPagesStart = legacyCacheDataRegionBuffer();
+ const dyld_cache_slide_info* slideInfoHeader = legacyCacheSlideInfo();
+
+ handler(dataStartAddress, dataSize, dataPagesStart,
+ header.slideInfoOffsetUnused, header.slideInfoSizeUnused, slideInfoHeader);
+ } else {
+ const dyld_cache_mapping_and_slide_info* slidableMappings = (const dyld_cache_mapping_and_slide_info*)((char*)this + header.mappingWithSlideOffset);
+ const dyld_cache_mapping_and_slide_info* linkeditMapping = &slidableMappings[header.mappingWithSlideCount - 1];
+ uint64_t sharedCacheSlide = (uint64_t)this - unslidLoadAddress();
+
+ for (uint32_t i = 0; i != header.mappingWithSlideCount; ++i) {
+ if ( slidableMappings[i].slideInfoFileOffset != 0 ) {
+ // Get the data pages
+ uint64_t dataStartAddress = slidableMappings[i].address;
+ uint64_t dataSize = slidableMappings[i].size;
+ const uint8_t* dataPagesStart = (uint8_t*)dataStartAddress + sharedCacheSlide;
+
+ // Get the slide info
+ uint64_t offsetInLinkEditRegion = (slidableMappings[i].slideInfoFileOffset - linkeditMapping->fileOffset);
+ const dyld_cache_slide_info* slideInfoHeader = (dyld_cache_slide_info*)((uint8_t*)(linkeditMapping->address) + sharedCacheSlide + offsetInLinkEditRegion);
+ handler(dataStartAddress, dataSize, dataPagesStart,
+ slidableMappings[i].slideInfoFileOffset, slidableMappings[i].slideInfoFileSize, slideInfoHeader);
+ }
+ }
+ }
+}
+
+#if BUILDING_LIBDYLD
+const char* DyldSharedCache::getCanonicalPath(const char *path) const {
+ uint32_t dyldCacheImageIndex;
+ if ( hasImagePath(path, dyldCacheImageIndex) )
+ return getIndexedImagePath(dyldCacheImageIndex);
+#if TARGET_OS_OSX
+ // on macOS support "Foo.framework/Foo" symlink
+ char resolvedPath[PATH_MAX];
+ realpath(path, resolvedPath);
+ int realpathErrno = errno;
+ // If realpath() resolves to a path which does not exist on disk, errno is set to ENOENT
+ if ( (realpathErrno == ENOENT) || (realpathErrno == 0) ) {
+ if ( hasImagePath(resolvedPath, dyldCacheImageIndex) )
+ return getIndexedImagePath(dyldCacheImageIndex);
+ }
+#endif
+ return nullptr;
+}
+#endif
#if !(BUILDING_LIBDYLD || BUILDING_DYLD)
void DyldSharedCache::fillMachOAnalyzersMap(std::unordered_map<std::string,dyld3::MachOAnalyzer*> & dylibAnalyzers) const {