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 25 extern "C" { 26 27 __attribute__((__weak__, visibility("default"))) 28 void* __loader_dlopen(const char* filename, int flags, const void* caller_addr); 29 30 __attribute__((__weak__, visibility("default"))) 31 char* __loader_dlerror(); 32 33 __attribute__((__weak__, visibility("default"))) 34 void* __loader_dlsym(void* handle, const char* symbol, const void* caller_addr); 35 36 __attribute__((__weak__, visibility("default"))) 37 void* __loader_dlvsym(void* handle, 38 const char* symbol, 39 const char* version, 40 const void* caller_addr); 41 42 __attribute__((__weak__, visibility("default"))) 43 int __loader_dladdr(const void* addr, Dl_info* info); 44 45 __attribute__((__weak__, visibility("default"))) 46 int __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"))) 54 int __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"))) 58 void __loader_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size); 59 60 __attribute__((__weak__, visibility("default"))) 61 void __loader_android_update_LD_LIBRARY_PATH(const char* ld_library_path); 62 63 __attribute__((__weak__, visibility("default"))) 64 void* __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"))) 70 void __loader_android_set_application_target_sdk_version(uint32_t target); 71 72 __attribute__((__weak__, visibility("default"))) 73 uint32_t __loader_android_get_application_target_sdk_version(); 74 75 __attribute__((__weak__, visibility("default"))) 76 bool __loader_android_init_anonymous_namespace(const char* shared_libs_sonames, 77 const char* library_search_path); 78 79 __attribute__((__weak__, visibility("default"))) 80 struct 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"))) 90 bool __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"))) 96 void __loader_android_dlwarning(void* obj, void (*f)(void*, const char*)); 97 98 __attribute__((__weak__, visibility("default"))) 99 struct android_namespace_t* __loader_android_get_exported_namespace(const char* name); 100 101 // Proxy calls to bionic loader 102 __attribute__((__weak__)) 103 void* 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__)) 109 char* dlerror() { 110 return __loader_dlerror(); 111 } 112 113 __attribute__((__weak__)) 114 void* 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__)) 120 void* 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__)) 126 int dladdr(const void* addr, Dl_info* info) { 127 return __loader_dladdr(addr, info); 128 } 129 130 __attribute__((__weak__)) 131 int 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__)) 147 int 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__)) 152 void 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__)) 157 void 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__)) 162 void* 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__)) 168 void android_set_application_target_sdk_version(uint32_t target) { 169 __loader_android_set_application_target_sdk_version(target); 170 } 171 172 __attribute__((__weak__)) 173 uint32_t android_get_application_target_sdk_version() { 174 return __loader_android_get_application_target_sdk_version(); 175 } 176 177 __attribute__((__weak__)) 178 bool 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__)) 184 struct 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__)) 201 bool 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__)) 208 void android_dlwarning(void* obj, void (*f)(void*, const char*)) { 209 __loader_android_dlwarning(obj, f); 210 } 211 212 __attribute__((__weak__)) 213 struct 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"))) 224 void __aeabi_unwind_cpp_pr0() { 225 __builtin_trap(); 226 } 227 #endif 228 229 } // extern "C" 230
