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")))
27void* __loader_dlopen(const char* filename, int flags, const void* caller_addr);
28
29__attribute__((__weak__, visibility("default")))
30void* __loader_dlerror();
31
32__attribute__((__weak__, visibility("default")))
33void* __loader_dlsym(void* handle, const char* symbol, const void* caller_addr);
34
35__attribute__((__weak__, visibility("default")))
36void* __loader_dlvsym(void* handle,
37                      const char* symbol,
38                      const char* version,
39                      const void* caller_addr);
40
41__attribute__((__weak__, visibility("default")))
42int __loader_dladdr(const void* addr, Dl_info* info);
43
44__attribute__((__weak__, visibility("default")))
45int __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")))
53int __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")))
57void __loader_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size);
58
59__attribute__((__weak__, visibility("default")))
60void __loader_android_update_LD_LIBRARY_PATH(const char* ld_library_path);
61
62__attribute__((__weak__, visibility("default")))
63void* __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")))
69void __loader_android_set_application_target_sdk_version(uint32_t target);
70
71__attribute__((__weak__, visibility("default")))
72uint32_t __loader_android_get_application_target_sdk_version();
73
74__attribute__((__weak__, visibility("default")))
75bool __loader_android_init_anonymous_namespace(const char* shared_libs_sonames,
76                                               const char* library_search_path);
77
78__attribute__((__weak__, visibility("default")))
79struct 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")))
89bool __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")))
95void __loader_android_dlwarning(void* obj, void (*f)(void*, const char*));
96
97__attribute__((__weak__, visibility("default")))
98struct android_namespace_t* __loader_android_get_exported_namespace(const char* name);
99
100// Proxy calls to bionic loader
101void* 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
106char* dlerror() {
107  return __loader_dlerror();
108}
109
110void* 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
115void* 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
120int dladdr(const void* addr, Dl_info* info) {
121  return __loader_dladdr(addr, info);
122}
123
124int dlclose(void* handle) {
125  return __loader_dlclose(handle);
126}
127
128#if defined(__arm__)
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
134int dl_iterate_phdr(int (*cb)(struct dl_phdr_info* info, size_t size, void* data), void* data) {
135  return __loader_dl_iterate_phdr(cb, data);
136}
137
138void android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) {
139  __loader_android_get_LD_LIBRARY_PATH(buffer, buffer_size);
140}
141
142void android_update_LD_LIBRARY_PATH(const char* ld_library_path) {
143  __loader_android_update_LD_LIBRARY_PATH(ld_library_path);
144}
145
146void* android_dlopen_ext(const char* filename, int flag, const android_dlextinfo* extinfo) {
147  const void* caller_addr = __builtin_return_address(0);
148  return __loader_android_dlopen_ext(filename, flag, extinfo, caller_addr);
149}
150
151void android_set_application_target_sdk_version(uint32_t target) {
152  __loader_android_set_application_target_sdk_version(target);
153}
154uint32_t android_get_application_target_sdk_version() {
155  return __loader_android_get_application_target_sdk_version();
156}
157
158bool android_init_anonymous_namespace(const char* shared_libs_sonames,
159                                      const char* library_search_path) {
160  return __loader_android_init_anonymous_namespace(shared_libs_sonames, library_search_path);
161}
162
163struct android_namespace_t* android_create_namespace(const char* name,
164                                                     const char* ld_library_path,
165                                                     const char* default_library_path,
166                                                     uint64_t type,
167                                                     const char* permitted_when_isolated_path,
168                                                     struct android_namespace_t* parent) {
169  const void* caller_addr = __builtin_return_address(0);
170  return __loader_android_create_namespace(name,
171                                           ld_library_path,
172                                           default_library_path,
173                                           type,
174                                           permitted_when_isolated_path,
175                                           parent,
176                                           caller_addr);
177}
178
179bool android_link_namespaces(struct android_namespace_t* namespace_from,
180                             struct android_namespace_t* namespace_to,
181                             const char* shared_libs_sonames) {
182  return __loader_android_link_namespaces(namespace_from, namespace_to, shared_libs_sonames);
183}
184
185void android_dlwarning(void* obj, void (*f)(void*, const char*)) {
186  __loader_android_dlwarning(obj, f);
187}
188
189struct android_namespace_t* android_get_exported_namespace(const char* name) {
190  return __loader_android_get_exported_namespace(name);
191}
192