elf_object.hh revision 11392
1/* 2 * Copyright (c) 2013 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2003-2005 The Regents of The University of Michigan 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Steve Reinhardt 41 */ 42 43#ifndef __ELF_OBJECT_HH__ 44#define __ELF_OBJECT_HH__ 45 46#include <set> 47#include <vector> 48 49#include "base/loader/object_file.hh" 50 51class ElfObject : public ObjectFile 52{ 53 protected: 54 55 //The global definition of a "Section" is closest to elf's segments. 56 typedef ObjectFile::Section Segment; 57 58 //These values are provided to a linux process by the kernel, so we 59 //need to keep them around. 60 Addr _programHeaderTable; 61 uint16_t _programHeaderSize; 62 uint16_t _programHeaderCount; 63 std::set<std::string> sectionNames; 64 65 ElfObject *interpreter; 66 67 // An interpreter load bias is the location in the process address space 68 // where the interpreter is chosen to reside. Typically, this is carved 69 // out of the top of the mmap reserve section. 70 Addr ldBias; 71 72 // The interpreter is typically a relocatable shared library and will 73 // have a default value of zero which means that it does not care where 74 // it is placed. However, the loader can be compiled and linked so that 75 // it does care and needs a specific entry point. 76 bool relocate; 77 78 // The ldMin and ldMax fields are required to know how large of an 79 // area is required to map the interpreter. 80 Addr ldMin; 81 Addr ldMax; 82 83 /// Helper functions for loadGlobalSymbols() and loadLocalSymbols(). 84 bool loadSomeSymbols(SymbolTable *symtab, int binding, Addr mask, 85 Addr base, Addr offset); 86 87 ElfObject(const std::string &_filename, size_t _len, uint8_t *_data, 88 Arch _arch, OpSys _opSys); 89 90 void getSections(); 91 bool sectionExists(std::string sec); 92 93 std::vector<Segment> extraSegments; 94 95 public: 96 virtual ~ElfObject() {} 97 98 bool loadSections(PortProxy& mem_proxy, Addr addr_mask = maxAddr, 99 Addr offset = 0) override; 100 101 virtual bool loadAllSymbols(SymbolTable *symtab, Addr base = 0, 102 Addr offset = 0, Addr addr_mask = maxAddr) 103 override; 104 105 virtual bool loadGlobalSymbols(SymbolTable *symtab, Addr base = 0, 106 Addr offset = 0, Addr addr_mask = maxAddr) 107 override; 108 109 virtual bool loadLocalSymbols(SymbolTable *symtab, Addr base = 0, 110 Addr offset = 0, Addr addr_mask = maxAddr) 111 override; 112 113 virtual bool loadWeakSymbols(SymbolTable *symtab, Addr base = 0, 114 Addr offset = 0, Addr addr_mask = maxAddr) 115 override; 116 117 118 virtual ObjectFile *getInterpreter() const override 119 { return interpreter; } 120 virtual Addr bias() const override { return ldBias; } 121 virtual bool relocatable() const override { return relocate; } 122 virtual Addr mapSize() const override { return ldMax - ldMin; } 123 virtual void updateBias(Addr bias_addr) override; 124 125 virtual bool hasTLS() override { return sectionExists(".tbss"); } 126 127 static ObjectFile *tryFile(const std::string &fname, 128 size_t len, uint8_t *data, 129 bool skip_interp_check = false); 130 Addr programHeaderTable() {return _programHeaderTable;} 131 uint16_t programHeaderSize() {return _programHeaderSize;} 132 uint16_t programHeaderCount() {return _programHeaderCount;} 133}; 134 135#endif // __ELF_OBJECT_HH__ 136