1 /* 2 * Copyright (C) 2012 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 <sys/cdefs.h> 32 33 #include <mutex> 34 #include <set> 35 #include <string> 36 37 #include <platform/bionic/macros.h> 38 39 struct MapEntry { MapEntryMapEntry40 MapEntry(uintptr_t start, uintptr_t end, uintptr_t offset, const char* name, size_t name_len, int flags) 41 : start(start), end(end), offset(offset), name(name, name_len), flags(flags) {} 42 MapEntryMapEntry43 explicit MapEntry(uintptr_t pc) : start(pc), end(pc) {} 44 45 uintptr_t start; 46 uintptr_t end; 47 uintptr_t offset; 48 uintptr_t load_bias; 49 uintptr_t elf_start_offset = 0; 50 std::string name; 51 int flags; 52 bool init = false; 53 bool valid = false; 54 }; 55 56 // Ordering comparator that returns equivalence for overlapping entries 57 struct compare_entries { operatorcompare_entries58 bool operator()(const MapEntry* a, const MapEntry* b) const { return a->end <= b->start; } 59 }; 60 61 class MapData { 62 public: 63 MapData() = default; 64 ~MapData(); 65 66 const MapEntry* find(uintptr_t pc, uintptr_t* rel_pc = nullptr); 67 68 private: 69 bool ReadMaps(); 70 71 std::mutex m_; 72 std::set<MapEntry*, compare_entries> entries_; 73 74 BIONIC_DISALLOW_COPY_AND_ASSIGN(MapData); 75 }; 76