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+++ dyld/dyld-635.2/launch-cache/dsc_iterator.cpp
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+/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
+ *
+ * Copyright (c) 2009-2012 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 <stdlib.h>
+#include <stdio.h>
+#include <Availability.h>
+
+
+#include "dsc_iterator.h"
+#include "dyld_cache_format.h"
+#define NO_ULEB
+#include "Architectures.hpp"
+#include "MachOFileAbstraction.hpp"
+#include "CacheFileAbstraction.hpp"
+#include "SupportedArchs.h"
+
+namespace dyld {
+
+
+ // convert an address in the shared region where the cache would normally be mapped, into an address where the cache is currently mapped
+ template <typename E>
+ const uint8_t* mappedAddress(const uint8_t* cache, const uint8_t* cacheEnd, uint64_t addr)
+ {
+ const dyldCacheHeader<E>* header = (dyldCacheHeader<E>*)cache;
+ const dyldCacheFileMapping<E>* mappings = (dyldCacheFileMapping<E>*)&cache[header->mappingOffset()];
+ for (uint32_t i=0; i < header->mappingCount(); ++i) {
+ if ( (mappings[i].address() <= addr) && (addr < (mappings[i].address() + mappings[i].size())) ) {
+ uint64_t cacheOffset = mappings[i].file_offset() + addr - mappings[i].address();
+ const uint8_t* result = &cache[cacheOffset];
+ if ( result < cacheEnd )
+ return result;
+ else
+ return NULL;
+ }
+ }
+ return NULL;
+ }
+
+ // call the callback block on each segment in this image
+ template <typename A>
+ int walkSegments(const uint8_t* cache, const uint8_t* cacheEnd, const uint8_t* firstSeg, const char* dylibPath, uint64_t inode,uint64_t modTime, const uint8_t* machHeader, uint64_t cache_unslid_base_address,
+ void (^callback)(const dyld_shared_cache_dylib_info* dylibInfo, const dyld_shared_cache_segment_info* segInfo))
+ {
+ typedef typename A::P P;
+ typedef typename A::P::E E;
+ dyld_shared_cache_dylib_info dylibInfo;
+ dyld_shared_cache_segment_info segInfo;
+ dylibInfo.version = 2;
+ dylibInfo.isAlias = (dylibPath < (char*)firstSeg); // paths for aliases are store between cache header and first segment
+ dylibInfo.machHeader = machHeader;
+ dylibInfo.path = dylibPath;
+ dylibInfo.inode = inode;
+ dylibInfo.modTime = modTime;
+ const macho_header<P>* mh = (const macho_header<P>*)machHeader;
+ const macho_load_command<P>* const cmds = (macho_load_command<P>*)(machHeader + sizeof(macho_header<P>));
+ if ( (machHeader+ mh->sizeofcmds()) > cacheEnd )
+ return -1;
+ const uint32_t cmd_count = mh->ncmds();
+ const macho_load_command<P>* cmd = cmds;
+ // scan for LC_UUID
+ dylibInfo.uuid = NULL;
+ for (uint32_t i = 0; i < cmd_count; ++i) {
+ if ( cmd->cmd() == LC_UUID ) {
+ const uuid_command* uc = (const uuid_command*)cmd;
+ dylibInfo.uuid = &uc->uuid;
+ break;
+ }
+ cmd = (const macho_load_command<P>*)(((uint8_t*)cmd)+cmd->cmdsize());
+ }
+ // callback for each LC_SEGMENT
+ cmd = cmds;
+ for (uint32_t i = 0; i < cmd_count; ++i) {
+ if ( cmd->cmd() == macho_segment_command<P>::CMD ) {
+ macho_segment_command<P>* segCmd = (macho_segment_command<P>*)cmd;
+ uint64_t fileOffset = segCmd->fileoff();
+ // work around until <rdar://problem/7022345> is fixed
+ if ( fileOffset == 0 ) {
+ fileOffset = (machHeader - cache);
+ }
+ uint64_t sizem = segCmd->vmsize();
+ if ( strcmp(segCmd->segname(), "__LINKEDIT") == 0 ) {
+ // clip LINKEDIT size if bigger than cache file
+ if ( (fileOffset+sizem) > (uint64_t)(cacheEnd-cache) )
+ sizem = (cacheEnd-cache)-fileOffset;
+ }
+ segInfo.version = 2;
+ segInfo.name = segCmd->segname();
+ segInfo.fileOffset = fileOffset;
+ segInfo.fileSize = sizem;
+ if ( segCmd->filesize() > segCmd->vmsize() )
+ return -1;
+ segInfo.address = segCmd->vmaddr();
+ segInfo.addressOffset = segInfo.address - cache_unslid_base_address;
+ callback(&dylibInfo, &segInfo);
+ }
+ cmd = (const macho_load_command<P>*)(((uint8_t*)cmd)+cmd->cmdsize());
+ }
+ return 0;
+ }
+
+
+ // call walkSegments on each image in the cache
+ template <typename A>
+ int walkImages(const uint8_t* cache, uint32_t size, void (^callback)(const dyld_shared_cache_dylib_info* dylibInfo, const dyld_shared_cache_segment_info* segInfo))
+ {
+ // Sanity check there is at least a header
+ if ( (size > 0) && (size < 0x7000) )
+ return -1;
+ typedef typename A::P::E E;
+ typedef typename A::P P;
+ const dyldCacheHeader<E>* header = (dyldCacheHeader<E>*)cache;
+ const dyldCacheImageInfo<E>* dylibs = (dyldCacheImageInfo<E>*)&cache[header->imagesOffset()];
+ const dyldCacheFileMapping<E>* mappings = (dyldCacheFileMapping<E>*)&cache[header->mappingOffset()];
+ uint64_t unslid_base_address = mappings[0].address();
+ uint64_t greatestMappingOffset = 0;
+ for (uint32_t i=0; i < header->mappingCount(); ++i) {
+ if ( (size != 0) && (mappings[i].file_offset() > size) )
+ return -1;
+ uint64_t endOffset = mappings[i].file_offset()+mappings[i].size();
+ if ( (size != 0) && (endOffset > size) )
+ return -1;
+ if ( endOffset > greatestMappingOffset )
+ greatestMappingOffset = endOffset;
+ }
+ const uint8_t* cacheEnd = &cache[size];
+ if ( size == 0 ) {
+ // Zero size means old API is being used, assume all mapped
+ cacheEnd = &cache[greatestMappingOffset];
+ }
+ else {
+ // verifiy mappings are not bigger than size
+ if ( size < greatestMappingOffset )
+ return -1;
+ }
+ // verify all image infos are mapped
+ if ( (const uint8_t*)&dylibs[header->imagesCount()] > cacheEnd )
+ return -1;
+ const uint8_t* firstSeg = NULL;
+ for (uint32_t i=0; i < header->imagesCount(); ++i) {
+ const char* dylibPath = (char*)cache + dylibs[i].pathFileOffset();
+ uint64_t inode = dylibs[i].inode();
+ uint64_t modTime = dylibs[i].modTime();
+ if ( (const uint8_t*)dylibPath > cacheEnd )
+ return -1;
+ const uint8_t* machHeader = mappedAddress<E>(cache, cacheEnd, dylibs[i].address());
+ if ( machHeader == NULL )
+ return -1;
+ if ( machHeader > cacheEnd )
+ return -1;
+ if ( firstSeg == NULL )
+ firstSeg = machHeader;
+ int result = walkSegments<A>(cache, cacheEnd, firstSeg, dylibPath, inode, modTime, machHeader, unslid_base_address, callback);
+ if ( result != 0 )
+ return result;
+ }
+ return 0;
+ }
+
+}
+
+
+// Given a pointer to an in-memory copy of a dyld shared cache file,
+// this routine will call the callback block once for each segment
+// in each dylib in the shared cache file.
+// Returns -1 if there was an error, otherwise 0.
+extern int dyld_shared_cache_iterate(const void* shared_cache_file, uint32_t shared_cache_size,
+ void (^callback)(const dyld_shared_cache_dylib_info* dylibInfo, const dyld_shared_cache_segment_info* segInfo)) {
+ const uint8_t* cache = (uint8_t*)shared_cache_file;
+ if ( strcmp((char*)cache, "dyld_v1 i386") == 0 )
+ return dyld::walkImages<x86>(cache, shared_cache_size, callback);
+ else if ( strcmp((char*)cache, "dyld_v1 x86_64") == 0 )
+ return dyld::walkImages<x86_64>(cache, shared_cache_size, callback);
+ else if ( strcmp((char*)cache, "dyld_v1 x86_64h") == 0 )
+ return dyld::walkImages<x86_64>(cache, shared_cache_size, callback);
+ else if ( strcmp((char*)cache, "dyld_v1 armv5") == 0 )
+ return dyld::walkImages<arm>(cache, shared_cache_size, callback);
+ else if ( strcmp((char*)cache, "dyld_v1 armv6") == 0 )
+ return dyld::walkImages<arm>(cache, shared_cache_size, callback);
+ else if ( strcmp((char*)cache, "dyld_v1 armv7") == 0 )
+ return dyld::walkImages<arm>(cache, shared_cache_size, callback);
+ else if ( strncmp((char*)cache, "dyld_v1 armv7", 14) == 0 )
+ return dyld::walkImages<arm>(cache, shared_cache_size, callback);
+ else if ( strcmp((char*)cache, "dyld_v1 arm64") == 0 )
+ return dyld::walkImages<arm64>(cache, shared_cache_size, callback);
+#if SUPPORT_ARCH_arm64_32
+ else if ( strcmp((char*)cache, "dyld_v1arm64_32") == 0 )
+ return dyld::walkImages<arm64_32>(cache, shared_cache_size, callback);
+#endif
+#if SUPPORT_ARCH_arm64e
+ else if ( strcmp((char*)cache, "dyld_v1 arm64e") == 0 )
+ return dyld::walkImages<arm64>(cache, shared_cache_size, callback);
+#endif
+ else
+ return -1;
+}
+
+
+// implement old version by calling new version
+int dyld_shared_cache_iterate_segments_with_slide(const void* shared_cache_file, dyld_shared_cache_iterator_slide_t callback)
+{
+ return dyld_shared_cache_iterate(shared_cache_file, 0, ^(const dyld_shared_cache_dylib_info* dylibInfo, const dyld_shared_cache_segment_info* segInfo) {
+ callback(dylibInfo->path, segInfo->name, segInfo->fileOffset, segInfo->fileSize, segInfo->address, 0);
+ });
+}
+
+// implement non-block version by calling block version
+int dyld_shared_cache_iterate_segments_with_slide_nb(const void* shared_cache_file, dyld_shared_cache_iterator_slide_nb_t func, void* userData)
+{
+ return dyld_shared_cache_iterate_segments_with_slide(shared_cache_file, ^(const char* dylibName, const char* segName,
+ uint64_t offset, uint64_t size, uint64_t mappedddress, uint64_t slide) {
+ (*func)(dylibName, segName, offset, size, mappedddress, slide, userData);
+ });
+}
+
+
+// implement non-slide version by wrapping slide version in block
+int dyld_shared_cache_iterate_segments(const void* shared_cache_file, dyld_shared_cache_iterator_t callback)
+{
+ dyld_shared_cache_iterator_slide_t wrapper_cb = ^(const char* dylibName, const char* segName, uint64_t offset,
+ uint64_t size, uint64_t mappedddress, uint64_t slide) {
+ callback(dylibName, segName, offset, size, mappedddress);
+ };
+ return dyld_shared_cache_iterate_segments_with_slide(shared_cache_file, wrapper_cb);
+}
+
+// implement non-slide,non-block version by wrapping slide version in block
+int dyld_shared_cache_iterate_segments_nb(const void* shared_cache_file, dyld_shared_cache_iterator_nb_t func, void* userData)
+{
+ return dyld_shared_cache_iterate_segments_with_slide(shared_cache_file, ^(const char* dylibName, const char* segName,
+ uint64_t offset, uint64_t size, uint64_t mappedddress, uint64_t slide) {
+ (*func)(dylibName, segName, offset, size, mappedddress, userData);
+ });
+}
+