[163] | 1 | /* |
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| 2 | This file is part of Libelfpp. |
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| 3 | |
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| 4 | Libelfpp is free software: you can redistribute it and/or modify |
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| 5 | it under the terms of the GNU Lesser General Public License as |
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| 6 | published by the Free Software Foundation, either version 3 of the |
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| 7 | License, or (at your option) any later version. |
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| 8 | |
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| 9 | Libelfpp is distributed in the hope that it will be useful, but |
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| 10 | WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with Libelfpp. If not, see |
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| 16 | <http://www.gnu.org/licenses/>. |
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| 17 | |
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| 18 | Copyright (c) Alexandre Becoulet <alexandre.becoulet@free.fr> |
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| 19 | */ |
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| 20 | |
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| 21 | |
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| 22 | #include <iostream> |
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| 23 | #include <stdlib.h> |
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| 24 | #include <cstring> |
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[173] | 25 | #include <stdlib.h> |
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[163] | 26 | |
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[173] | 27 | |
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[163] | 28 | #include <dpp/foreach> |
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| 29 | |
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| 30 | #include <elfpp/section> |
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| 31 | #include <elfpp/object> |
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| 32 | #include <elfpp/segment> |
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| 33 | #include <elfpp/symbol> |
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| 34 | #include <elfpp/reloc> |
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| 35 | |
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| 36 | namespace elfpp |
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| 37 | { |
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| 38 | |
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| 39 | section::section(object &obj, sh_type_e type) |
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| 40 | : name_(), |
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| 41 | type_(type), |
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| 42 | flags_(SHF_NONE), |
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| 43 | vaddr_(0), |
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| 44 | size_(0), |
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| 45 | link_(0), |
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| 46 | info_(0), |
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| 47 | align_(0), |
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| 48 | entsize_(0), |
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| 49 | index_(0), |
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| 50 | back_info_(0), |
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| 51 | back_link_(0), |
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| 52 | object_(&obj), |
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| 53 | content_(0), |
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| 54 | sym_tab_() |
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| 55 | { |
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| 56 | } |
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| 57 | |
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| 58 | section::~section() |
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| 59 | { |
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| 60 | if (!orphan()) |
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| 61 | remove(); |
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| 62 | |
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| 63 | if (content_) |
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| 64 | free(content_); |
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| 65 | |
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| 66 | object_->secidx_[index_] = 0; |
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| 67 | |
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| 68 | FOREACH(s, sym_tab_) |
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| 69 | delete s->second; |
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| 70 | } |
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| 71 | |
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| 72 | void section::set_size(size_t size) |
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| 73 | { |
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| 74 | if (type_ != SHT_NOBITS && size_ != size) |
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| 75 | { |
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| 76 | content_ = (uint8_t*)realloc(content_, size); |
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| 77 | |
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| 78 | assert(content_ || size == 0); |
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| 79 | |
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| 80 | if (size > size_) |
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| 81 | std::memset(content_ + size_, 0, size - size_); |
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| 82 | } |
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| 83 | |
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| 84 | size_ = size; |
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| 85 | } |
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| 86 | |
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[173] | 87 | void section::set_content(void* a) |
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| 88 | { |
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| 89 | if(content_) |
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| 90 | free(content_); |
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| 91 | content_ = (uint8_t*) a; |
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| 92 | } |
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| 93 | |
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[163] | 94 | void section::add_symbol(symbol &sym) |
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| 95 | { |
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| 96 | sym_tab_.insert(sym_tab_map_t::value_type(sym.get_name(), &sym)); |
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| 97 | } |
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| 98 | |
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| 99 | symbol & section::get_symbol(uint64_t offset) |
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| 100 | { |
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| 101 | symbol *res = 0; |
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| 102 | |
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| 103 | FOREACH(i, get_symbol_table()) |
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| 104 | { |
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| 105 | symbol *j = i->second; |
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| 106 | |
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| 107 | if (!j->get_size()) |
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| 108 | continue; |
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| 109 | |
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| 110 | if (j->get_value() <= offset && (!res || j->get_value() > res->get_value())) |
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| 111 | res = j; |
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| 112 | } |
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| 113 | |
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| 114 | if (!res) |
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| 115 | throw std::runtime_error("no symbol found"); |
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| 116 | |
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| 117 | if (offset - res->get_value() >= res->get_size()) |
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| 118 | throw std::runtime_error("offset above symbol size"); |
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| 119 | |
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| 120 | return *res; |
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| 121 | } |
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| 122 | |
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| 123 | segment * section::get_segment() const |
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| 124 | { |
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| 125 | if (!object_) |
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| 126 | throw std::runtime_error("section is not part of an object"); |
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| 127 | |
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| 128 | // find associated segment based on section content in elf file |
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| 129 | FOREACH(s, object_->get_segment_table()) |
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| 130 | { |
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| 131 | if (get_file_offset() >= s->get_file_offset() && |
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| 132 | get_file_offset() < s->get_file_offset() + (off_t)s->get_file_size()) |
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| 133 | return &*s; |
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| 134 | } |
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| 135 | |
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| 136 | return 0; |
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| 137 | } |
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| 138 | |
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| 139 | uint64_t section::get_load_address() const |
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| 140 | { |
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| 141 | segment *s = get_segment(); |
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| 142 | |
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| 143 | if (!s) |
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| 144 | throw std::runtime_error("section is not located in a segment"); |
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| 145 | |
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| 146 | return vaddr_ - s->get_vaddr() + s->get_paddr(); |
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| 147 | } |
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| 148 | |
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| 149 | std::ostream & operator<<(std::ostream &o, const section &s) |
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| 150 | { |
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| 151 | o << "[" << s.name_ << " addr:0x" << std::hex << s.vaddr_ << " size:" << std::dec << s.size_ << "]"; |
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| 152 | return o; |
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| 153 | } |
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| 154 | |
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| 155 | } |
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| 156 | |
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