source: soft/giet_vm/memo/src/libelfpp/elfpp_section.cc @ 272

Last change on this file since 272 was 173, checked in by karaoui, 12 years ago

Adding BLOB type for vobj.
Don't forget to set as BLOB type the mapping_info vobj in the xml.

File size: 3.3 KB
Line 
1/*
2    This file is part of Libelfpp.
3
4    Libelfpp is free software: you can redistribute it and/or modify
5    it under the terms of the GNU Lesser General Public License as
6    published by the Free Software Foundation, either version 3 of the
7    License, or (at your option) any later version.
8
9    Libelfpp is distributed in the hope that it will be useful, but
10    WITHOUT ANY WARRANTY; without even the implied warranty of
11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12    General Public License for more details.
13
14    You should have received a copy of the GNU Lesser General Public
15    License along with Libelfpp.  If not, see
16    <http://www.gnu.org/licenses/>.
17
18   Copyright (c) Alexandre Becoulet <alexandre.becoulet@free.fr>
19*/
20
21
22#include <iostream>
23#include <stdlib.h>
24#include <cstring>
25#include <stdlib.h>
26
27
28#include <dpp/foreach>
29
30#include <elfpp/section>
31#include <elfpp/object>
32#include <elfpp/segment>
33#include <elfpp/symbol>
34#include <elfpp/reloc>
35
36namespace elfpp
37{
38
39  section::section(object &obj, sh_type_e type)
40    : name_(),
41      type_(type),
42      flags_(SHF_NONE),
43      vaddr_(0),
44      size_(0),
45      link_(0),
46      info_(0),
47      align_(0),
48      entsize_(0),
49      index_(0),
50      back_info_(0),
51      back_link_(0),
52      object_(&obj),
53      content_(0),
54      sym_tab_()
55  {
56  }
57
58  section::~section()
59  {
60    if (!orphan())
61      remove();
62
63    if (content_)
64      free(content_);
65
66    object_->secidx_[index_] = 0;
67
68    FOREACH(s, sym_tab_)
69      delete s->second;
70  }
71
72  void section::set_size(size_t size)
73  {
74    if (type_ != SHT_NOBITS && size_ != size)
75      {
76        content_ = (uint8_t*)realloc(content_, size);
77
78        assert(content_ || size == 0);
79
80        if (size > size_)
81          std::memset(content_ + size_, 0, size - size_);
82      }
83
84    size_ = size;
85  }
86
87  void section::set_content(void* a)
88  {
89    if(content_)
90        free(content_);
91    content_ = (uint8_t*) a;
92  }
93
94  void section::add_symbol(symbol &sym)
95  {
96    sym_tab_.insert(sym_tab_map_t::value_type(sym.get_name(), &sym));
97  }
98
99  symbol & section::get_symbol(uint64_t offset)
100  {
101    symbol *res = 0;
102
103    FOREACH(i, get_symbol_table())
104      {
105        symbol *j = i->second;
106
107        if (!j->get_size())
108          continue;
109
110        if (j->get_value() <= offset && (!res || j->get_value() > res->get_value()))
111          res = j;
112      }
113
114    if (!res)
115      throw std::runtime_error("no symbol found");
116
117    if (offset - res->get_value() >= res->get_size())
118      throw std::runtime_error("offset above symbol size");
119
120    return *res;
121  }
122
123  segment * section::get_segment() const
124  {
125    if (!object_)
126      throw std::runtime_error("section is not part of an object");
127
128    // find associated segment based on section content in elf file
129    FOREACH(s, object_->get_segment_table())
130      {
131        if (get_file_offset() >= s->get_file_offset() &&
132            get_file_offset() < s->get_file_offset() + (off_t)s->get_file_size())
133          return &*s;
134      }
135
136    return 0;
137  }
138
139  uint64_t section::get_load_address() const
140  {
141    segment *s = get_segment();
142
143    if (!s)
144      throw std::runtime_error("section is not located in a segment");
145
146    return vaddr_ - s->get_vaddr() + s->get_paddr();
147  }
148
149  std::ostream & operator<<(std::ostream &o, const section &s)
150  {
151    o << "[" << s.name_ << " addr:0x" << std::hex << s.vaddr_ << " size:" << std::dec << s.size_ << "]";
152    return o;
153  }
154
155}
156
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