1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #pragma once 30 31 #include <link.h> 32 #include <stddef.h> 33 34 #include <string> 35 #include <unordered_map> 36 37 #include <async_safe/log.h> 38 39 #define DL_ERR(fmt, x...) \ 40 do { \ 41 async_safe_format_buffer(linker_get_error_buffer(), linker_get_error_buffer_size(), fmt, ##x); \ 42 } while (false) 43 44 #define DL_WARN(fmt, x...) \ 45 do { \ 46 async_safe_format_log(ANDROID_LOG_WARN, "linker", fmt, ##x); \ 47 async_safe_format_fd(2, "WARNING: linker: "); \ 48 async_safe_format_fd(2, fmt, ##x); \ 49 async_safe_format_fd(2, "\n"); \ 50 } while (false) 51 52 void DL_WARN_documented_change(int api_level, const char* doc_link, const char* fmt, ...); 53 54 #define DL_ERR_AND_LOG(fmt, x...) \ 55 do { \ 56 DL_ERR(fmt, ##x); \ 57 PRINT(fmt, ##x); \ 58 } while (false) 59 60 #define DL_OPEN_ERR(fmt, x...) \ 61 do { \ 62 DL_ERR(fmt, ##x); \ 63 LD_LOG(kLogDlopen, fmt, ##x); \ 64 } while (false) 65 66 #define DL_SYM_ERR(fmt, x...) \ 67 do { \ 68 DL_ERR(fmt, ##x); \ 69 LD_LOG(kLogDlsym, fmt, ##x); \ 70 } while (false) 71 72 constexpr ElfW(Versym) kVersymNotNeeded = 0; 73 constexpr ElfW(Versym) kVersymGlobal = 1; 74 75 // These values are used to call constructors for .init_array && .preinit_array 76 extern int g_argc; 77 extern char** g_argv; 78 extern char** g_envp; 79 80 struct soinfo; 81 struct android_namespace_t; 82 struct platform_properties; 83 84 extern android_namespace_t g_default_namespace; 85 86 extern std::unordered_map<uintptr_t, soinfo*> g_soinfo_handles_map; 87 88 extern platform_properties g_platform_properties; 89 90 // Error buffer "variable" 91 char* linker_get_error_buffer(); 92 size_t linker_get_error_buffer_size(); 93 94 class DlErrorRestorer { 95 public: DlErrorRestorer()96 DlErrorRestorer() { 97 saved_error_msg_ = linker_get_error_buffer(); 98 } ~DlErrorRestorer()99 ~DlErrorRestorer() { 100 strlcpy(linker_get_error_buffer(), saved_error_msg_.c_str(), linker_get_error_buffer_size()); 101 } 102 private: 103 std::string saved_error_msg_; 104 }; 105 106 __LIBC_HIDDEN__ extern bool g_is_ldd; 107 __LIBC_HIDDEN__ extern pthread_mutex_t g_dl_mutex; 108