/* * Copyright (C) 2008 The Android Open Source Project * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef _LINKER_H_ #define _LINKER_H_ #include #include #include #include #include #include #include #include "private/bionic_page.h" #include "private/libc_logging.h" #include "linked_list.h" #include "linker_common_types.h" #include "linker_logger.h" #include "linker_soinfo.h" #include #include #if defined(__LP64__) #define ELFW(what) ELF64_ ## what #else #define ELFW(what) ELF32_ ## what #endif // mips64 interprets Elf64_Rel structures' r_info field differently. // bionic (like other C libraries) has macros that assume regular ELF files, // but the dynamic linker needs to be able to load mips64 ELF files. #if defined(__mips__) && defined(__LP64__) #undef ELF64_R_SYM #undef ELF64_R_TYPE #undef ELF64_R_INFO #define ELF64_R_SYM(info) (((info) >> 0) & 0xffffffff) #define ELF64_R_SSYM(info) (((info) >> 32) & 0xff) #define ELF64_R_TYPE3(info) (((info) >> 40) & 0xff) #define ELF64_R_TYPE2(info) (((info) >> 48) & 0xff) #define ELF64_R_TYPE(info) (((info) >> 56) & 0xff) #endif #define SUPPORTED_DT_FLAGS_1 (DF_1_NOW | DF_1_GLOBAL | DF_1_NODELETE | DF_1_PIE) // Class used construct version dependency graph. class VersionTracker { public: VersionTracker() = default; bool init(const soinfo* si_from); const version_info* get_version_info(ElfW(Versym) source_symver) const; private: bool init_verneed(const soinfo* si_from); bool init_verdef(const soinfo* si_from); void add_version_info(size_t source_index, ElfW(Word) elf_hash, const char* ver_name, const soinfo* target_si); std::vector version_infos; DISALLOW_COPY_AND_ASSIGN(VersionTracker); }; bool soinfo_do_lookup(soinfo* si_from, const char* name, const version_info* vi, soinfo** si_found_in, const soinfo_list_t& global_group, const soinfo_list_t& local_group, const ElfW(Sym)** symbol); enum RelocationKind { kRelocAbsolute = 0, kRelocRelative, kRelocCopy, kRelocSymbol, kRelocMax }; void count_relocation(RelocationKind kind); soinfo* get_libdl_info(const char* linker_path); soinfo* find_containing_library(const void* p); void do_android_get_LD_LIBRARY_PATH(char*, size_t); void do_android_update_LD_LIBRARY_PATH(const char* ld_library_path); void* do_dlopen(const char* name, int flags, const android_dlextinfo* extinfo, const void* caller_addr); int do_dlclose(void* handle); int do_dl_iterate_phdr(int (*cb)(dl_phdr_info* info, size_t size, void* data), void* data); #if defined(__arm__) _Unwind_Ptr do_dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount); #endif bool do_dlsym(void* handle, const char* sym_name, const char* sym_ver, const void* caller_addr, void** symbol); int do_dladdr(const void* addr, Dl_info* info); // void ___cfi_slowpath(uint64_t CallSiteTypeId, void *Ptr, void *Ret); // void ___cfi_slowpath_diag(uint64_t CallSiteTypeId, void *Ptr, void *DiagData, void *Ret); void ___cfi_fail(uint64_t CallSiteTypeId, void* Ptr, void *DiagData, void *Ret); void set_application_target_sdk_version(uint32_t target); uint32_t get_application_target_sdk_version(); enum { /* A regular namespace is the namespace with a custom search path that does * not impose any restrictions on the location of native libraries. */ ANDROID_NAMESPACE_TYPE_REGULAR = 0, /* An isolated namespace requires all the libraries to be on the search path * or under permitted_when_isolated_path. The search path is the union of * ld_library_path and default_library_path. */ ANDROID_NAMESPACE_TYPE_ISOLATED = 1, /* The shared namespace clones the list of libraries of the caller namespace upon creation * which means that they are shared between namespaces - the caller namespace and the new one * will use the same copy of a library if it was loaded prior to android_create_namespace call. * * Note that libraries loaded after the namespace is created will not be shared. * * Shared namespaces can be isolated or regular. Note that they do not inherit the search path nor * permitted_path from the caller's namespace. */ ANDROID_NAMESPACE_TYPE_SHARED = 2, /* This flag instructs linker to enable grey-list workaround for the namespace. * See http://b/26394120 for details. */ ANDROID_NAMESPACE_TYPE_GREYLIST_ENABLED = 0x08000000, ANDROID_NAMESPACE_TYPE_SHARED_ISOLATED = ANDROID_NAMESPACE_TYPE_SHARED | ANDROID_NAMESPACE_TYPE_ISOLATED, }; bool init_anonymous_namespace(const char* shared_lib_sonames, const char* library_search_path); android_namespace_t* create_namespace(const void* caller_addr, const char* name, const char* ld_library_path, const char* default_library_path, uint64_t type, const char* permitted_when_isolated_path, android_namespace_t* parent_namespace); bool link_namespaces(android_namespace_t* namespace_from, android_namespace_t* namespace_to, const char* shared_lib_sonames); android_namespace_t* get_exported_namespace(const char* name); #endif