dlopen_testlib_ifunc.c revision 9aea164457c269c475592da36b4655d45f55c7bc 
1/*
2 * Copyright (C) 2014 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 <stdio.h>
18#include <stdlib.h>
19
20static int g_flag = 0;
21
22static void __attribute__((constructor)) init_flag() {
23  g_flag = 1;
24}
25
26static const char* is_ctor_called() __attribute__ ((ifunc("is_ctor_called_ifun")));
27
28const char* foo() __attribute__ ((ifunc ("foo_ifunc")));
29
30// Static linker creates GLOBAL/IFUNC symbol and JUMP_SLOT relocation type for plt segment
31const char* is_ctor_called_jump_slot() __attribute__ ((ifunc("is_ctor_called_ifun")));
32
33const char* is_ctor_called_irelative() {
34  // Call internal ifunc-resolved function with IRELATIVE reloc
35  return is_ctor_called();
36}
37
38const char* return_true() {
39  return "true";
40}
41
42const char* return_false() {
43  return "false";
44}
45
46const char* f1() {
47  return "unset";
48}
49
50const char* f2() {
51  return "set";
52}
53
54void* is_ctor_called_ifun() {
55  return g_flag == 0 ? return_false : return_true;
56}
57
58void* foo_ifunc() {
59   char* choice = getenv("IFUNC_CHOICE");
60   return choice == NULL ? f1 : f2;
61}
62
63const char* foo_library() {
64   return foo();
65}
66