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      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 constexpr ElfW(Versym) kVersymNotNeeded = 0;
     61 constexpr ElfW(Versym) kVersymGlobal = 1;
     62 
     63 // These values are used to call constructors for .init_array && .preinit_array
     64 extern int g_argc;
     65 extern char** g_argv;
     66 extern char** g_envp;
     67 
     68 struct soinfo;
     69 struct android_namespace_t;
     70 
     71 extern android_namespace_t g_default_namespace;
     72 
     73 extern std::unordered_map<uintptr_t, soinfo*> g_soinfo_handles_map;
     74 
     75 // Error buffer "variable"
     76 char* linker_get_error_buffer();
     77 size_t linker_get_error_buffer_size();
     78 
     79 class DlErrorRestorer {
     80  public:
     81   DlErrorRestorer() {
     82     saved_error_msg_ = linker_get_error_buffer();
     83   }
     84   ~DlErrorRestorer() {
     85     strlcpy(linker_get_error_buffer(), saved_error_msg_.c_str(), linker_get_error_buffer_size());
     86   }
     87  private:
     88   std::string saved_error_msg_;
     89 };
     90