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_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size); 29 30 __attribute__((__weak__, visibility("default"))) 31 void* __loader_dlopen(const char* filename, int flags, const void* caller_addr); 32 33 __attribute__((__weak__, visibility("default"))) 34 char* __loader_dlerror(); 35 36 __attribute__((__weak__, visibility("default"))) 37 void* __loader_dlsym(void* handle, const char* symbol, const void* caller_addr); 38 39 __attribute__((__weak__, visibility("default"))) 40 void* __loader_dlvsym(void* handle, 41 const char* symbol, 42 const char* version, 43 const void* caller_addr); 44 45 __attribute__((__weak__, visibility("default"))) 46 int __loader_dladdr(const void* addr, Dl_info* info); 47 48 __attribute__((__weak__, visibility("default"))) 49 int __loader_dlclose(void* handle); 50 51 #if defined(__arm__) 52 __attribute__((__weak__, visibility("default"))) 53 _Unwind_Ptr __loader_dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount); 54 #endif 55 56 __attribute__((__weak__, visibility("default"))) 57 int __loader_dl_iterate_phdr(int (*cb)(struct dl_phdr_info* info, size_t size, void* data), 58 void* data); 59 60 __attribute__((__weak__, visibility("default"))) 61 void __loader_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size); 62 63 __attribute__((__weak__, visibility("default"))) 64 void __loader_android_update_LD_LIBRARY_PATH(const char* ld_library_path); 65 66 __attribute__((__weak__, visibility("default"))) 67 void* __loader_android_dlopen_ext(const char* filename, 68 int flag, 69 const android_dlextinfo* extinfo, 70 const void* caller_addr); 71 72 __attribute__((__weak__, visibility("default"))) 73 int __loader_android_get_application_target_sdk_version(); 74 75 // Proxy calls to bionic loader 76 __attribute__((__weak__)) 77 void android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) { 78 __loader_android_get_LD_LIBRARY_PATH(buffer, buffer_size); 79 } 80 81 __attribute__((__weak__)) 82 void* dlopen(const char* filename, int flag) { 83 const void* caller_addr = __builtin_return_address(0); 84 return __loader_dlopen(filename, flag, caller_addr); 85 } 86 87 __attribute__((__weak__)) 88 char* dlerror() { 89 return __loader_dlerror(); 90 } 91 92 __attribute__((__weak__)) 93 void* dlsym(void* handle, const char* symbol) { 94 const void* caller_addr = __builtin_return_address(0); 95 return __loader_dlsym(handle, symbol, caller_addr); 96 } 97 98 __attribute__((__weak__)) 99 void* dlvsym(void* handle, const char* symbol, const char* version) { 100 const void* caller_addr = __builtin_return_address(0); 101 return __loader_dlvsym(handle, symbol, version, caller_addr); 102 } 103 104 __attribute__((__weak__)) 105 int dladdr(const void* addr, Dl_info* info) { 106 return __loader_dladdr(addr, info); 107 } 108 109 __attribute__((__weak__)) 110 int dlclose(void* handle) { 111 return __loader_dlclose(handle); 112 } 113 114 #if defined(__arm__) 115 __attribute__((__weak__)) 116 _Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount) { 117 return __loader_dl_unwind_find_exidx(pc, pcount); 118 } 119 #endif 120 121 /* 122 * This needs to be defined as weak because it is also defined in libc.a. 123 * Without this, static executables will have a multiple definition error. 124 */ 125 __attribute__((__weak__)) 126 int dl_iterate_phdr(int (*cb)(struct dl_phdr_info* info, size_t size, void* data), void* data) { 127 return __loader_dl_iterate_phdr(cb, data); 128 } 129 130 __attribute__((__weak__)) 131 void* android_dlopen_ext(const char* filename, int flag, const android_dlextinfo* extinfo) { 132 const void* caller_addr = __builtin_return_address(0); 133 return __loader_android_dlopen_ext(filename, flag, extinfo, caller_addr); 134 } 135 136 __attribute__((__weak__)) 137 int android_get_application_target_sdk_version() { 138 return __loader_android_get_application_target_sdk_version(); 139 } 140 141 #if defined(__arm__) 142 // An arm32 unwinding table has an R_ARM_NONE relocation to 143 // __aeabi_unwind_cpp_pr0. This shared library will never invoke the unwinder, 144 // so it doesn't actually need the routine. Define a dummy version here, 145 // because the real version calls libc functions (e.g. memcpy, abort), which 146 // would create a dependency cycle with libc.so. 147 __attribute__((visibility("hidden"))) 148 void __aeabi_unwind_cpp_pr0() { 149 __builtin_trap(); 150 } 151 #endif 152 153 } // extern "C" 154
