1/* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include <dlfcn.h> 18#include <link.h> 19#include <stdlib.h> 20#include <android/dlext.h> 21 22// These functions are exported by the loader 23// TODO(dimitry): replace these with reference to libc.so 24 25extern "C" { 26 27__attribute__((__weak__, visibility("default"))) 28void* __loader_dlopen(const char* filename, int flags, const void* caller_addr); 29 30__attribute__((__weak__, visibility("default"))) 31char* __loader_dlerror(); 32 33__attribute__((__weak__, visibility("default"))) 34void* __loader_dlsym(void* handle, const char* symbol, const void* caller_addr); 35 36__attribute__((__weak__, visibility("default"))) 37void* __loader_dlvsym(void* handle, 38 const char* symbol, 39 const char* version, 40 const void* caller_addr); 41 42__attribute__((__weak__, visibility("default"))) 43int __loader_dladdr(const void* addr, Dl_info* info); 44 45__attribute__((__weak__, visibility("default"))) 46int __loader_dlclose(void* handle); 47 48#if defined(__arm__) 49__attribute__((__weak__, visibility("default"))) 50_Unwind_Ptr __loader_dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount); 51#endif 52 53__attribute__((__weak__, visibility("default"))) 54int __loader_dl_iterate_phdr(int (*cb)(struct dl_phdr_info* info, size_t size, void* data), 55 void* data); 56 57__attribute__((__weak__, visibility("default"))) 58void __loader_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size); 59 60__attribute__((__weak__, visibility("default"))) 61void __loader_android_update_LD_LIBRARY_PATH(const char* ld_library_path); 62 63__attribute__((__weak__, visibility("default"))) 64void* __loader_android_dlopen_ext(const char* filename, 65 int flag, 66 const android_dlextinfo* extinfo, 67 const void* caller_addr); 68 69__attribute__((__weak__, visibility("default"))) 70void __loader_android_set_application_target_sdk_version(uint32_t target); 71 72__attribute__((__weak__, visibility("default"))) 73uint32_t __loader_android_get_application_target_sdk_version(); 74 75__attribute__((__weak__, visibility("default"))) 76bool __loader_android_init_anonymous_namespace(const char* shared_libs_sonames, 77 const char* library_search_path); 78 79__attribute__((__weak__, visibility("default"))) 80struct android_namespace_t* __loader_android_create_namespace( 81 const char* name, 82 const char* ld_library_path, 83 const char* default_library_path, 84 uint64_t type, 85 const char* permitted_when_isolated_path, 86 struct android_namespace_t* parent, 87 const void* caller_addr); 88 89__attribute__((__weak__, visibility("default"))) 90bool __loader_android_link_namespaces( 91 struct android_namespace_t* namespace_from, 92 struct android_namespace_t* namespace_to, 93 const char* shared_libs_sonames); 94 95__attribute__((__weak__, visibility("default"))) 96void __loader_android_dlwarning(void* obj, void (*f)(void*, const char*)); 97 98__attribute__((__weak__, visibility("default"))) 99struct android_namespace_t* __loader_android_get_exported_namespace(const char* name); 100 101// Proxy calls to bionic loader 102__attribute__((__weak__)) 103void* dlopen(const char* filename, int flag) { 104 const void* caller_addr = __builtin_return_address(0); 105 return __loader_dlopen(filename, flag, caller_addr); 106} 107 108__attribute__((__weak__)) 109char* dlerror() { 110 return __loader_dlerror(); 111} 112 113__attribute__((__weak__)) 114void* dlsym(void* handle, const char* symbol) { 115 const void* caller_addr = __builtin_return_address(0); 116 return __loader_dlsym(handle, symbol, caller_addr); 117} 118 119__attribute__((__weak__)) 120void* dlvsym(void* handle, const char* symbol, const char* version) { 121 const void* caller_addr = __builtin_return_address(0); 122 return __loader_dlvsym(handle, symbol, version, caller_addr); 123} 124 125__attribute__((__weak__)) 126int dladdr(const void* addr, Dl_info* info) { 127 return __loader_dladdr(addr, info); 128} 129 130__attribute__((__weak__)) 131int dlclose(void* handle) { 132 return __loader_dlclose(handle); 133} 134 135#if defined(__arm__) 136__attribute__((__weak__)) 137_Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount) { 138 return __loader_dl_unwind_find_exidx(pc, pcount); 139} 140#endif 141 142/* 143 * This needs to be defined as weak because it is also defined in libc.a. 144 * Without this, static executables will have a multiple definition error. 145 */ 146__attribute__((__weak__)) 147int dl_iterate_phdr(int (*cb)(struct dl_phdr_info* info, size_t size, void* data), void* data) { 148 return __loader_dl_iterate_phdr(cb, data); 149} 150 151__attribute__((__weak__)) 152void android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) { 153 __loader_android_get_LD_LIBRARY_PATH(buffer, buffer_size); 154} 155 156__attribute__((__weak__)) 157void android_update_LD_LIBRARY_PATH(const char* ld_library_path) { 158 __loader_android_update_LD_LIBRARY_PATH(ld_library_path); 159} 160 161__attribute__((__weak__)) 162void* android_dlopen_ext(const char* filename, int flag, const android_dlextinfo* extinfo) { 163 const void* caller_addr = __builtin_return_address(0); 164 return __loader_android_dlopen_ext(filename, flag, extinfo, caller_addr); 165} 166 167__attribute__((__weak__)) 168void android_set_application_target_sdk_version(uint32_t target) { 169 __loader_android_set_application_target_sdk_version(target); 170} 171 172__attribute__((__weak__)) 173uint32_t android_get_application_target_sdk_version() { 174 return __loader_android_get_application_target_sdk_version(); 175} 176 177__attribute__((__weak__)) 178bool android_init_anonymous_namespace(const char* shared_libs_sonames, 179 const char* library_search_path) { 180 return __loader_android_init_anonymous_namespace(shared_libs_sonames, library_search_path); 181} 182 183__attribute__((__weak__)) 184struct android_namespace_t* android_create_namespace(const char* name, 185 const char* ld_library_path, 186 const char* default_library_path, 187 uint64_t type, 188 const char* permitted_when_isolated_path, 189 struct android_namespace_t* parent) { 190 const void* caller_addr = __builtin_return_address(0); 191 return __loader_android_create_namespace(name, 192 ld_library_path, 193 default_library_path, 194 type, 195 permitted_when_isolated_path, 196 parent, 197 caller_addr); 198} 199 200__attribute__((__weak__)) 201bool android_link_namespaces(struct android_namespace_t* namespace_from, 202 struct android_namespace_t* namespace_to, 203 const char* shared_libs_sonames) { 204 return __loader_android_link_namespaces(namespace_from, namespace_to, shared_libs_sonames); 205} 206 207__attribute__((__weak__)) 208void android_dlwarning(void* obj, void (*f)(void*, const char*)) { 209 __loader_android_dlwarning(obj, f); 210} 211 212__attribute__((__weak__)) 213struct android_namespace_t* android_get_exported_namespace(const char* name) { 214 return __loader_android_get_exported_namespace(name); 215} 216 217#if defined(__arm__) 218// An arm32 unwinding table has an R_ARM_NONE relocation to 219// __aeabi_unwind_cpp_pr0. This shared library will never invoke the unwinder, 220// so it doesn't actually need the routine. Define a dummy version here, 221// because the real version calls libc functions (e.g. memcpy, abort), which 222// would create a dependency cycle with libc.so. 223__attribute__((visibility("hidden"))) 224void __aeabi_unwind_cpp_pr0() { 225 __builtin_trap(); 226} 227#endif 228 229} // extern "C" 230