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_android_update_LD_LIBRARY_PATH(const char* ld_library_path); 32 33 __attribute__((__weak__, visibility("default"))) 34 void __loader_android_set_application_target_sdk_version(int target); 35 36 __attribute__((__weak__, visibility("default"))) 37 bool __loader_android_init_anonymous_namespace(const char* shared_libs_sonames, 38 const char* library_search_path); 39 40 __attribute__((__weak__, visibility("default"))) 41 struct android_namespace_t* __loader_android_create_namespace( 42 const char* name, 43 const char* ld_library_path, 44 const char* default_library_path, 45 uint64_t type, 46 const char* permitted_when_isolated_path, 47 struct android_namespace_t* parent, 48 const void* caller_addr); 49 50 __attribute__((__weak__, visibility("default"))) 51 bool __loader_android_link_namespaces( 52 struct android_namespace_t* namespace_from, 53 struct android_namespace_t* namespace_to, 54 const char* shared_libs_sonames); 55 56 __attribute__((__weak__, visibility("default"))) 57 void __loader_android_dlwarning(void* obj, void (*f)(void*, const char*)); 58 59 __attribute__((__weak__, visibility("default"))) 60 struct android_namespace_t* __loader_android_get_exported_namespace(const char* name); 61 62 // Proxy calls to bionic loader 63 __attribute__((__weak__)) 64 void android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) { 65 __loader_android_get_LD_LIBRARY_PATH(buffer, buffer_size); 66 } 67 68 __attribute__((__weak__)) 69 void android_update_LD_LIBRARY_PATH(const char* ld_library_path) { 70 __loader_android_update_LD_LIBRARY_PATH(ld_library_path); 71 } 72 73 __attribute__((__weak__)) 74 void android_set_application_target_sdk_version(int target) { 75 __loader_android_set_application_target_sdk_version(target); 76 } 77 78 __attribute__((__weak__)) 79 bool android_init_anonymous_namespace(const char* shared_libs_sonames, 80 const char* library_search_path) { 81 return __loader_android_init_anonymous_namespace(shared_libs_sonames, library_search_path); 82 } 83 84 __attribute__((__weak__)) 85 struct android_namespace_t* android_create_namespace(const char* name, 86 const char* ld_library_path, 87 const char* default_library_path, 88 uint64_t type, 89 const char* permitted_when_isolated_path, 90 struct android_namespace_t* parent) { 91 const void* caller_addr = __builtin_return_address(0); 92 return __loader_android_create_namespace(name, 93 ld_library_path, 94 default_library_path, 95 type, 96 permitted_when_isolated_path, 97 parent, 98 caller_addr); 99 } 100 101 __attribute__((__weak__)) 102 bool android_link_namespaces(struct android_namespace_t* namespace_from, 103 struct android_namespace_t* namespace_to, 104 const char* shared_libs_sonames) { 105 return __loader_android_link_namespaces(namespace_from, namespace_to, shared_libs_sonames); 106 } 107 108 __attribute__((__weak__)) 109 void android_dlwarning(void* obj, void (*f)(void*, const char*)) { 110 __loader_android_dlwarning(obj, f); 111 } 112 113 __attribute__((__weak__)) 114 struct android_namespace_t* android_get_exported_namespace(const char* name) { 115 return __loader_android_get_exported_namespace(name); 116 } 117 118 #if defined(__arm__) 119 // An arm32 unwinding table has an R_ARM_NONE relocation to 120 // __aeabi_unwind_cpp_pr0. This shared library will never invoke the unwinder, 121 // so it doesn't actually need the routine. Define a dummy version here, 122 // because the real version calls libc functions (e.g. memcpy, abort), which 123 // would create a dependency cycle with libc.so. 124 __attribute__((visibility("hidden"))) 125 void __aeabi_unwind_cpp_pr0() { 126 __builtin_trap(); 127 } 128 #endif 129 130 } // extern "C" 131
