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 <stdbool.h>
21 #include <android/dlext.h>
22
23 // These functions are exported by the loader
24 // TODO(dimitry): replace these with reference to libc.so
25
26 __attribute__((__weak__, visibility("default")))
27 void* __loader_dlopen(const char* filename, int flags, const void* caller_addr);
28
29 __attribute__((__weak__, visibility("default")))
30 void* __loader_dlerror();
31
32 __attribute__((__weak__, visibility("default")))
33 void* __loader_dlsym(void* handle, const char* symbol, const void* caller_addr);
34
35 __attribute__((__weak__, visibility("default")))
36 void* __loader_dlvsym(void* handle,
37 const char* symbol,
38 const char* version,
39 const void* caller_addr);
40
41 __attribute__((__weak__, visibility("default")))
42 int __loader_dladdr(const void* addr, Dl_info* info);
43
44 __attribute__((__weak__, visibility("default")))
45 int __loader_dlclose(void* handle);
46
47 #if defined(__arm__)
48 __attribute__((__weak__, visibility("default")))
49 _Unwind_Ptr __loader_dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount);
50 #endif
51
52 __attribute__((__weak__, visibility("default")))
53 int __loader_dl_iterate_phdr(int (*cb)(struct dl_phdr_info* info, size_t size, void* data),
54 void* data);
55
56 __attribute__((__weak__, visibility("default")))
57 void __loader_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size);
58
59 __attribute__((__weak__, visibility("default")))
60 void __loader_android_update_LD_LIBRARY_PATH(const char* ld_library_path);
61
62 __attribute__((__weak__, visibility("default")))
63 void* __loader_android_dlopen_ext(const char* filename,
64 int flag,
65 const android_dlextinfo* extinfo,
66 const void* caller_addr);
67
68 __attribute__((__weak__, visibility("default")))
69 void __loader_android_set_application_target_sdk_version(uint32_t target);
70
71 __attribute__((__weak__, visibility("default")))
72 uint32_t __loader_android_get_application_target_sdk_version();
73
74 __attribute__((__weak__, visibility("default")))
75 bool __loader_android_init_anonymous_namespace(const char* shared_libs_sonames,
76 const char* library_search_path);
77
78 __attribute__((__weak__, visibility("default")))
79 struct android_namespace_t* __loader_android_create_namespace(
80 const char* name,
81 const char* ld_library_path,
82 const char* default_library_path,
83 uint64_t type,
84 const char* permitted_when_isolated_path,
85 struct android_namespace_t* parent,
86 const void* caller_addr);
87
88 __attribute__((__weak__, visibility("default")))
89 bool __loader_android_link_namespaces(
90 struct android_namespace_t* namespace_from,
91 struct android_namespace_t* namespace_to,
92 const char* shared_libs_sonames);
93
94 __attribute__((__weak__, visibility("default")))
95 void __loader_android_dlwarning(void* obj, void (*f)(void*, const char*));
96
97 __attribute__((__weak__, visibility("default")))
98 struct android_namespace_t* __loader_android_get_exported_namespace(const char* name);
99
100 // Proxy calls to bionic loader
dlopen(const char * filename,int flag)101 void* dlopen(const char* filename, int flag) {
102 const void* caller_addr = __builtin_return_address(0);
103 return __loader_dlopen(filename, flag, caller_addr);
104 }
105
dlerror()106 char* dlerror() {
107 return __loader_dlerror();
108 }
109
dlsym(void * handle,const char * symbol)110 void* dlsym(void* handle, const char* symbol) {
111 const void* caller_addr = __builtin_return_address(0);
112 return __loader_dlsym(handle, symbol, caller_addr);
113 }
114
dlvsym(void * handle,const char * symbol,const char * version)115 void* dlvsym(void* handle, const char* symbol, const char* version) {
116 const void* caller_addr = __builtin_return_address(0);
117 return __loader_dlvsym(handle, symbol, version, caller_addr);
118 }
119
dladdr(const void * addr,Dl_info * info)120 int dladdr(const void* addr, Dl_info* info) {
121 return __loader_dladdr(addr, info);
122 }
123
dlclose(void * handle)124 int dlclose(void* handle) {
125 return __loader_dlclose(handle);
126 }
127
128 #if defined(__arm__)
dl_unwind_find_exidx(_Unwind_Ptr pc,int * pcount)129 _Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount) {
130 return __loader_dl_unwind_find_exidx(pc, pcount);
131 }
132 #endif
133
134 /*
135 * This needs to be defined as weak because it is also defined in libc.a.
136 * Without this, static executables will have a multiple definition error.
137 */
138 __attribute__((__weak__))
dl_iterate_phdr(int (* cb)(struct dl_phdr_info * info,size_t size,void * data),void * data)139 int dl_iterate_phdr(int (*cb)(struct dl_phdr_info* info, size_t size, void* data), void* data) {
140 return __loader_dl_iterate_phdr(cb, data);
141 }
142
android_get_LD_LIBRARY_PATH(char * buffer,size_t buffer_size)143 void android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) {
144 __loader_android_get_LD_LIBRARY_PATH(buffer, buffer_size);
145 }
146
android_update_LD_LIBRARY_PATH(const char * ld_library_path)147 void android_update_LD_LIBRARY_PATH(const char* ld_library_path) {
148 __loader_android_update_LD_LIBRARY_PATH(ld_library_path);
149 }
150
android_dlopen_ext(const char * filename,int flag,const android_dlextinfo * extinfo)151 void* android_dlopen_ext(const char* filename, int flag, const android_dlextinfo* extinfo) {
152 const void* caller_addr = __builtin_return_address(0);
153 return __loader_android_dlopen_ext(filename, flag, extinfo, caller_addr);
154 }
155
android_set_application_target_sdk_version(uint32_t target)156 void android_set_application_target_sdk_version(uint32_t target) {
157 __loader_android_set_application_target_sdk_version(target);
158 }
android_get_application_target_sdk_version()159 uint32_t android_get_application_target_sdk_version() {
160 return __loader_android_get_application_target_sdk_version();
161 }
162
android_init_anonymous_namespace(const char * shared_libs_sonames,const char * library_search_path)163 bool android_init_anonymous_namespace(const char* shared_libs_sonames,
164 const char* library_search_path) {
165 return __loader_android_init_anonymous_namespace(shared_libs_sonames, library_search_path);
166 }
167
android_create_namespace(const char * name,const char * ld_library_path,const char * default_library_path,uint64_t type,const char * permitted_when_isolated_path,struct android_namespace_t * parent)168 struct android_namespace_t* android_create_namespace(const char* name,
169 const char* ld_library_path,
170 const char* default_library_path,
171 uint64_t type,
172 const char* permitted_when_isolated_path,
173 struct android_namespace_t* parent) {
174 const void* caller_addr = __builtin_return_address(0);
175 return __loader_android_create_namespace(name,
176 ld_library_path,
177 default_library_path,
178 type,
179 permitted_when_isolated_path,
180 parent,
181 caller_addr);
182 }
183
android_link_namespaces(struct android_namespace_t * namespace_from,struct android_namespace_t * namespace_to,const char * shared_libs_sonames)184 bool android_link_namespaces(struct android_namespace_t* namespace_from,
185 struct android_namespace_t* namespace_to,
186 const char* shared_libs_sonames) {
187 return __loader_android_link_namespaces(namespace_from, namespace_to, shared_libs_sonames);
188 }
189
android_dlwarning(void * obj,void (* f)(void *,const char *))190 void android_dlwarning(void* obj, void (*f)(void*, const char*)) {
191 __loader_android_dlwarning(obj, f);
192 }
193
android_get_exported_namespace(const char * name)194 struct android_namespace_t* android_get_exported_namespace(const char* name) {
195 return __loader_android_get_exported_namespace(name);
196 }
197