1 | /* |
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2 | * Copyright (c) 2011-2012, Chris Johns <chrisj@rtems.org> |
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3 | * |
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4 | * Permission to use, copy, modify, and/or distribute this software for any |
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5 | * purpose with or without fee is hereby granted, provided that the above |
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6 | * copyright notice and this permission notice appear in all copies. |
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7 | * |
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8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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15 | */ |
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16 | /** |
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17 | * @file |
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18 | * |
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19 | * @ingroup rtems-ld |
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20 | * |
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21 | * @brief RTEMS Linker ELF module manages the ELF format images. |
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22 | * |
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23 | */ |
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24 | |
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25 | #include <string.h> |
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26 | |
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27 | #include <rld.h> |
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28 | |
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29 | namespace rld |
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30 | { |
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31 | namespace elf |
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32 | { |
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33 | /** |
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34 | * Throw an ELF error. |
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35 | * |
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36 | * @param where Where the error is raised. |
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37 | */ |
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38 | void libelf_error (const std::string& where) |
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39 | { |
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40 | throw rld::error (::elf_errmsg (-1), "libelf:" + where); |
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41 | } |
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42 | |
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43 | /** |
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44 | * We record the first class, machine and .. type of object file we get the |
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45 | * header of and all header must match. We cannot mix object module types. |
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46 | */ |
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47 | static unsigned int elf_object_class = ELFCLASSNONE; |
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48 | static unsigned int elf_object_data = ELFDATANONE; |
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49 | static unsigned int elf_object_machinetype = EM_NONE; |
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50 | |
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51 | /** |
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52 | * A single place to initialise the libelf library. This must be called |
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53 | * before any libelf API calls are made. |
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54 | */ |
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55 | static void |
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56 | libelf_initialise () |
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57 | { |
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58 | static bool libelf_initialised = false; |
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59 | if (!libelf_initialised) |
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60 | { |
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61 | if (::elf_version (EV_CURRENT) == EV_NONE) |
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62 | libelf_error ("initialisation"); |
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63 | libelf_initialised = true; |
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64 | } |
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65 | } |
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66 | |
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67 | section::section (file& file_, int index_) |
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68 | : file_ (&file_), |
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69 | index_ (index_), |
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70 | scn (0), |
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71 | data_ (0) |
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72 | { |
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73 | memset (&shdr, 0, sizeof (shdr)); |
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74 | |
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75 | scn = ::elf_getscn (file_.get_elf (), index_); |
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76 | if (!scn) |
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77 | libelf_error ("elf_getscn: " + file_.name ()); |
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78 | |
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79 | if (!::gelf_getshdr (scn, &shdr)) |
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80 | libelf_error ("gelf_getshdr: " + file_.name ()); |
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81 | |
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82 | if (shdr.sh_type != SHT_NULL) |
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83 | { |
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84 | name_ = file_.get_string (shdr.sh_name); |
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85 | data_ = ::elf_getdata (scn, NULL); |
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86 | if (!data_) |
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87 | libelf_error ("elf_getdata: " + name_ + '(' + file_.name () + ')'); |
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88 | } |
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89 | } |
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90 | |
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91 | section::section (const section& orig) |
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92 | : file_ (orig.file_), |
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93 | index_ (orig.index_), |
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94 | name_ (orig.name_), |
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95 | scn (orig.scn), |
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96 | shdr (orig.shdr), |
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97 | data_ (orig.data_) |
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98 | { |
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99 | } |
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100 | |
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101 | section::section () |
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102 | : file_ (0), |
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103 | index_ (-1), |
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104 | scn (0), |
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105 | data_ (0) |
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106 | { |
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107 | memset (&shdr, 0, sizeof (shdr)); |
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108 | } |
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109 | |
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110 | int |
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111 | section::index () const |
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112 | { |
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113 | check (); |
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114 | return index_; |
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115 | } |
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116 | |
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117 | const std::string& |
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118 | section::name () const |
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119 | { |
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120 | check (); |
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121 | return name_; |
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122 | } |
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123 | |
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124 | elf_data* |
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125 | section::data () |
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126 | { |
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127 | check (); |
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128 | return data_; |
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129 | } |
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130 | |
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131 | elf_word |
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132 | section::type () const |
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133 | { |
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134 | check (); |
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135 | return shdr.sh_type; |
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136 | } |
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137 | |
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138 | elf_xword |
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139 | section::flags () const |
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140 | { |
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141 | check (); |
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142 | return shdr.sh_flags; |
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143 | } |
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144 | |
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145 | elf_addr |
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146 | section::address () const |
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147 | { |
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148 | check (); |
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149 | return shdr.sh_addr; |
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150 | } |
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151 | |
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152 | elf_xword |
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153 | section::alignment () const |
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154 | { |
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155 | check (); |
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156 | return shdr.sh_addralign; |
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157 | } |
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158 | |
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159 | elf_off |
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160 | section::offset () const |
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161 | { |
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162 | check (); |
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163 | return shdr.sh_offset; |
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164 | } |
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165 | |
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166 | elf_word |
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167 | section::link () const |
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168 | { |
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169 | check (); |
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170 | return shdr.sh_link; |
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171 | } |
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172 | |
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173 | elf_word |
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174 | section::info () const |
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175 | { |
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176 | check (); |
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177 | return shdr.sh_info; |
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178 | } |
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179 | |
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180 | elf_xword |
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181 | section::size () const |
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182 | { |
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183 | check (); |
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184 | return shdr.sh_size; |
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185 | } |
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186 | |
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187 | elf_xword |
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188 | section::entry_size () const |
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189 | { |
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190 | check (); |
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191 | return shdr.sh_entsize; |
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192 | } |
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193 | |
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194 | int |
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195 | section::entries () const |
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196 | { |
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197 | return size () / entry_size (); |
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198 | } |
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199 | |
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200 | void |
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201 | section::check () const |
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202 | { |
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203 | if (!file_ || (index_ < 0)) |
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204 | throw rld::error ("Invalid section.", "section:check:"); |
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205 | } |
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206 | |
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207 | file::file () |
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208 | : fd_ (-1), |
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209 | archive (false), |
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210 | writable (false), |
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211 | elf_ (0), |
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212 | oclass (0), |
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213 | ident_str (0), |
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214 | ident_size (0) |
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215 | { |
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216 | memset (&ehdr, 0, sizeof (ehdr)); |
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217 | memset (&phdr, 0, sizeof (phdr)); |
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218 | } |
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219 | |
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220 | file::~file () |
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221 | { |
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222 | end (); |
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223 | } |
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224 | |
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225 | void |
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226 | file::begin (const std::string& name__, int fd__, const bool writable_) |
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227 | { |
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228 | begin (name__, fd__, writable_, 0, 0); |
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229 | } |
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230 | |
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231 | void |
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232 | file::begin (const std::string& name__, file& archive_, off_t offset) |
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233 | { |
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234 | archive_.check ("begin:archive"); |
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235 | |
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236 | if (archive_.writable) |
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237 | throw rld::error ("archive is writable", "elf:file:begin"); |
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238 | |
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239 | begin (name__, archive_.fd_, false, &archive_, offset); |
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240 | } |
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241 | |
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242 | #define rld_archive_fhdr_size (60) |
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243 | |
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244 | void |
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245 | file::begin (const std::string& name__, |
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246 | int fd__, |
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247 | const bool writable_, |
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248 | file* archive_, |
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249 | off_t offset_) |
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250 | { |
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251 | if (fd__ < 0) |
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252 | throw rld::error ("no file descriptor", "elf:file:begin"); |
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253 | |
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254 | /* |
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255 | * Begin's are not nesting. |
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256 | */ |
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257 | if (elf_ || (fd_ >= 0)) |
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258 | throw rld::error ("already called", "elf:file:begin"); |
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259 | |
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260 | /* |
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261 | * Cannot write directly into archive. Create a file then archive it. |
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262 | */ |
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263 | if (archive_ && writable_) |
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264 | throw rld::error ("cannot write into archives directly", |
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265 | "elf:file:begin"); |
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266 | |
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267 | libelf_initialise (); |
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268 | |
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269 | /* |
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270 | * Is this image part of an archive ? |
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271 | */ |
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272 | if (archive_) |
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273 | { |
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274 | ssize_t offset = offset_ - rld_archive_fhdr_size; |
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275 | if (::elf_rand (archive_->elf_, offset) != offset) |
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276 | libelf_error ("rand: " + archive_->name_); |
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277 | } |
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278 | |
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279 | /* |
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280 | * Note, the elf passed is either the archive or NULL. |
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281 | */ |
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282 | elf* elf__ = ::elf_begin (fd__, |
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283 | writable_ ? ELF_C_WRITE : ELF_C_READ, |
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284 | archive_ ? archive_->elf_ : 0); |
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285 | if (!elf__) |
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286 | libelf_error ("begin: " + name__); |
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287 | |
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288 | if (rld::verbose () >= RLD_VERBOSE_FULL_DEBUG) |
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289 | std::cout << "elf::begin: " << elf__ << ' ' << name__ << std::endl; |
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290 | |
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291 | elf_kind ek = ::elf_kind (elf__); |
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292 | |
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293 | /* |
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294 | * If this is inside an archive it must be an ELF file. |
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295 | */ |
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296 | |
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297 | if (archive_ && (ek != ELF_K_ELF)) |
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298 | throw rld::error ("File format in archive not ELF", "elf:file:begin: " + name__); |
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299 | else |
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300 | { |
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301 | if (ek == ELF_K_AR) |
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302 | archive = true; |
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303 | else if (ek == ELF_K_ELF) |
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304 | archive = false; |
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305 | else |
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306 | throw rld::error ("File format not ELF or archive", |
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307 | "elf:file:begin: " + name__); |
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308 | } |
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309 | |
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310 | if (!writable_) |
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311 | { |
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312 | /* |
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313 | * If an ELF file make sure they all match. On the first file that |
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314 | * begins an ELF session record its settings. |
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315 | */ |
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316 | if (ek == ELF_K_ELF) |
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317 | { |
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318 | oclass = ::gelf_getclass (elf__); |
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319 | ident_str = elf_getident (elf__, &ident_size); |
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320 | } |
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321 | } |
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322 | |
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323 | fd_ = fd__; |
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324 | name_ = name__; |
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325 | writable = writable_; |
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326 | elf_ = elf__; |
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327 | |
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328 | if (!archive) |
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329 | load_header (); |
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330 | } |
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331 | |
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332 | void |
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333 | file::end () |
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334 | { |
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335 | if (elf_) |
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336 | { |
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337 | if (rld::verbose () >= RLD_VERBOSE_FULL_DEBUG) |
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338 | std::cout << "libelf::end: " << elf_ |
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339 | << ' ' << name_ << std::endl; |
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340 | ::elf_end (elf_); |
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341 | } |
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342 | |
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343 | fd_ = -1; |
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344 | name_.clear (); |
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345 | archive = false; |
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346 | elf_ = 0; |
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347 | oclass = 0; |
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348 | ident_str = 0; |
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349 | ident_size = 0; |
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350 | memset (&ehdr, 0, sizeof (ehdr)); |
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351 | memset (&phdr, 0, sizeof (phdr)); |
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352 | stab.clear (); |
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353 | secs.clear (); |
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354 | } |
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355 | |
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356 | void |
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357 | file::load_header () |
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358 | { |
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359 | check ("get_header"); |
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360 | |
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361 | if (::gelf_getehdr (elf_, &ehdr) == NULL) |
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362 | error ("get-header"); |
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363 | } |
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364 | |
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365 | unsigned int |
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366 | file::machinetype () const |
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367 | { |
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368 | check ("machinetype"); |
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369 | return ehdr.e_machine; |
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370 | } |
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371 | |
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372 | unsigned int |
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373 | file::type () const |
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374 | { |
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375 | check ("type"); |
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376 | return ehdr.e_type; |
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377 | } |
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378 | |
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379 | unsigned int |
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380 | file::object_class () const |
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381 | { |
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382 | check ("object_class"); |
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383 | return oclass; |
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384 | } |
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385 | |
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386 | unsigned int |
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387 | file::data_type () const |
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388 | { |
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389 | check ("data_type"); |
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390 | if (!ident_str) |
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391 | throw rld::error ("No ELF ident str", "elf:file:data_type: " + name_); |
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392 | return ident_str[EI_DATA]; |
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393 | } |
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394 | |
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395 | bool |
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396 | file::is_archive () const |
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397 | { |
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398 | check ("is_archive"); |
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399 | return archive; |
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400 | } |
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401 | |
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402 | bool |
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403 | file::is_executable () const |
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404 | { |
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405 | check ("is_executable"); |
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406 | return ehdr.e_type != ET_REL; |
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407 | } |
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408 | |
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409 | bool |
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410 | file::is_relocatable() const |
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411 | { |
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412 | check ("is_relocatable"); |
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413 | return ehdr.e_type == ET_REL; |
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414 | } |
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415 | |
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416 | int |
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417 | file::section_count () const |
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418 | { |
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419 | check ("section_count"); |
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420 | return ehdr.e_shnum; |
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421 | } |
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422 | |
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423 | void |
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424 | file::load_sections () |
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425 | { |
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426 | if (secs.empty ()) |
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427 | { |
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428 | check ("load_sections_headers"); |
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429 | for (int sn = 0; sn < section_count (); ++sn) |
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430 | secs.push_back (section (*this, sn)); |
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431 | } |
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432 | } |
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433 | |
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434 | void |
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435 | file::get_sections (sections& filtered_secs, unsigned int type) |
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436 | { |
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437 | load_sections (); |
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438 | filtered_secs.clear (); |
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439 | for (sections::iterator si = secs.begin (); |
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440 | si != secs.end (); |
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441 | ++si) |
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442 | { |
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443 | if ((type == 0) || ((*si).type () == type)) |
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444 | filtered_secs.push_back (*si); |
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445 | } |
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446 | } |
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447 | |
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448 | void |
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449 | file::load_symbols () |
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450 | { |
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451 | if (symbols.empty ()) |
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452 | { |
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453 | sections symbol_secs; |
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454 | |
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455 | get_sections (symbol_secs, SHT_SYMTAB); |
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456 | |
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457 | for (sections::iterator si = symbol_secs.begin (); |
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458 | si != symbol_secs.end (); |
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459 | ++si) |
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460 | { |
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461 | section& sec = *si; |
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462 | int syms = sec.entries (); |
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463 | |
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464 | for (int s = 0; s < syms; ++s) |
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465 | { |
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466 | elf_sym esym; |
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467 | |
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468 | if (!::gelf_getsym (sec.data (), s, &esym)) |
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469 | error ("gelf_getsym"); |
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470 | |
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471 | std::string name = get_string (sec.link (), esym.st_name); |
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472 | |
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473 | if (!name.empty ()) |
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474 | { |
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475 | symbols::symbol sym (name, esym); |
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476 | |
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477 | if (rld::verbose () >= RLD_VERBOSE_TRACE) |
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478 | { |
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479 | std::cout << "elf::symbol: "; |
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480 | sym.output (std::cout); |
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481 | std::cout << std::endl; |
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482 | } |
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483 | |
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484 | symbols.push_back (sym); |
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485 | } |
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486 | } |
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487 | } |
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488 | } |
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489 | } |
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490 | |
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491 | void |
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492 | file::get_symbols (symbols::pointers& filtered_syms, |
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493 | bool unresolved, |
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494 | bool local, |
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495 | bool weak, |
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496 | bool global) |
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497 | { |
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498 | if (rld::verbose () >= RLD_VERBOSE_DETAILS) |
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499 | std::cout << "elf:get-syms: unresolved:" << unresolved |
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500 | << " local:" << local |
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501 | << " weak:" << weak |
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502 | << " global:" << global |
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503 | << " " << name_ |
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504 | << std::endl; |
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505 | |
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506 | load_symbols (); |
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507 | |
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508 | filtered_syms.clear (); |
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509 | |
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510 | for (symbols::bucket::iterator si = symbols.begin (); |
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511 | si != symbols.end (); |
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512 | ++si) |
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513 | { |
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514 | symbols::symbol& sym = *si; |
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515 | |
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516 | int stype = sym.type (); |
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517 | int sbind = sym.binding (); |
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518 | |
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519 | /* |
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520 | * If wanting unresolved symbols and the type is no-type and the |
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521 | * section is undefined, or, the type is no-type or object or function |
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522 | * and the bind is local and we want local symbols, or the bind is weak |
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523 | * and we want weak symbols, or the bind is global and we want global |
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524 | * symbols then add the filtered symbols container. |
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525 | */ |
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526 | bool add = false; |
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527 | |
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528 | if ((stype == STT_NOTYPE) && (sym.index () == SHN_UNDEF)) |
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529 | { |
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530 | if (unresolved) |
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531 | add = true; |
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532 | } |
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533 | else if (!unresolved) |
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534 | { |
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535 | if (((stype == STT_NOTYPE) || |
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536 | (stype == STT_OBJECT) || |
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537 | (stype == STT_FUNC)) && |
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538 | ((local && (sbind == STB_LOCAL)) || |
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539 | (weak && (sbind == STB_WEAK)) || |
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540 | (global && (sbind == STB_GLOBAL)))) |
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541 | add = true; |
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542 | } |
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543 | |
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544 | if (add) |
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545 | filtered_syms.push_back (&sym); |
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546 | } |
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547 | } |
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548 | |
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549 | int |
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550 | file::strings_section () const |
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551 | { |
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552 | check ("strings_sections"); |
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553 | return ehdr.e_shstrndx; |
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554 | } |
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555 | |
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556 | std::string |
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557 | file::get_string (int section, size_t offset) |
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558 | { |
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559 | check ("get_string"); |
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560 | char* s = ::elf_strptr (elf_, section, offset); |
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561 | if (!s) |
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562 | error ("elf_strptr"); |
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563 | return s; |
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564 | } |
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565 | |
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566 | std::string |
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567 | file::get_string (size_t offset) |
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568 | { |
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569 | check ("get_string"); |
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570 | char* s = ::elf_strptr (elf_, strings_section (), offset); |
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571 | if (!s) |
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572 | error ("elf_strptr"); |
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573 | return s; |
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574 | } |
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575 | |
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576 | #if 0 |
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577 | void |
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578 | file::set_header (xxx) |
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579 | { |
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580 | elf_ehdr* ehdr_ = ::gelf_newehdr (elf_); |
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581 | |
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582 | if (ehdr == NULL) |
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583 | error ("set-header"); |
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584 | |
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585 | ehdr->xx = xx; |
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586 | |
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587 | ::gelf_flagphdr (elf_, ELF_C_SET , ELF_F_DIRTY); |
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588 | } |
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589 | #endif |
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590 | |
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591 | elf* |
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592 | file::get_elf () |
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593 | { |
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594 | return elf_; |
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595 | } |
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596 | |
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597 | const std::string& |
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598 | file::name () const |
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599 | { |
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600 | return name_; |
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601 | } |
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602 | |
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603 | bool |
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604 | file::is_writable () const |
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605 | { |
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606 | return writable; |
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607 | } |
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608 | |
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609 | void |
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610 | file::check (const char* where) const |
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611 | { |
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612 | if (!elf_ || (fd_ < 0)) |
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613 | { |
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614 | std::string w = where; |
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615 | throw rld::error ("no elf file or header", "elf:file:" + w); |
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616 | } |
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617 | } |
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618 | |
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619 | void |
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620 | file::check_writable (const char* where) const |
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621 | { |
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622 | check (where); |
---|
623 | if (!writable) |
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624 | { |
---|
625 | std::string w = where; |
---|
626 | throw rld::error ("not writable", "elf:file:" + w); |
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627 | } |
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628 | } |
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629 | |
---|
630 | void |
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631 | file::error (const char* where) const |
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632 | { |
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633 | std::string w = where; |
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634 | libelf_error (w + ": " + name_); |
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635 | } |
---|
636 | |
---|
637 | const std::string |
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638 | machine_type (unsigned int machinetype) |
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639 | { |
---|
640 | struct types_and_labels |
---|
641 | { |
---|
642 | const char* name; //< The RTEMS label. |
---|
643 | unsigned int machinetype; //< The machine type. |
---|
644 | }; |
---|
645 | types_and_labels types_to_labels[] = |
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646 | { |
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647 | { "arm", EM_ARM }, |
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648 | { "avr", EM_AVR }, |
---|
649 | { "bfin", EM_BLACKFIN }, |
---|
650 | { "h8300", EM_H8_300 }, |
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651 | { "i386", EM_386 }, |
---|
652 | /* { "m32c", EM_M32C }, Not in libelf I imported */ |
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653 | { "m32r", EM_M32R }, |
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654 | { "m68k", EM_68K }, |
---|
655 | { "m68k", EM_COLDFIRE }, |
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656 | { "mips", EM_MIPS }, |
---|
657 | { "powerpc", EM_PPC }, |
---|
658 | { "sh", EM_SH }, |
---|
659 | { "sparc", EM_SPARC }, |
---|
660 | { "sparc64", EM_SPARC }, |
---|
661 | { 0, EM_NONE } |
---|
662 | }; |
---|
663 | |
---|
664 | int m = 0; |
---|
665 | while (types_to_labels[m].machinetype != EM_NONE) |
---|
666 | { |
---|
667 | if (machinetype == types_to_labels[m].machinetype) |
---|
668 | return types_to_labels[m].name; |
---|
669 | ++m; |
---|
670 | } |
---|
671 | |
---|
672 | std::ostringstream what; |
---|
673 | what << "unknown machine type: " << elf_object_machinetype; |
---|
674 | throw rld::error (what, "machine-type"); |
---|
675 | } |
---|
676 | |
---|
677 | const std::string machine_type () |
---|
678 | { |
---|
679 | return machine_type (elf_object_machinetype); |
---|
680 | } |
---|
681 | |
---|
682 | void |
---|
683 | check_file(const file& file) |
---|
684 | { |
---|
685 | if (elf_object_machinetype == EM_NONE) |
---|
686 | elf_object_machinetype = file.machinetype (); |
---|
687 | else if (file.machinetype () != elf_object_machinetype) |
---|
688 | { |
---|
689 | std::ostringstream oss; |
---|
690 | oss << "elf:check_file:" << file.name () |
---|
691 | << ": " << elf_object_machinetype << '/' << file.machinetype (); |
---|
692 | throw rld::error ("Mixed machine types not supported.", oss.str ()); |
---|
693 | } |
---|
694 | |
---|
695 | if (elf_object_class == ELFCLASSNONE) |
---|
696 | elf_object_class = file.object_class (); |
---|
697 | else if (file.object_class () != elf_object_class) |
---|
698 | throw rld::error ("Mixed classes not allowed (32bit/64bit).", |
---|
699 | "elf:check_file: " + file.name ()); |
---|
700 | |
---|
701 | if (elf_object_data == ELFDATANONE) |
---|
702 | elf_object_data = file.data_type (); |
---|
703 | else if (elf_object_data != file.data_type ()) |
---|
704 | throw rld::error ("Mixed data types not allowed (LSB/MSB).", |
---|
705 | "elf:check_file: " + file.name ()); |
---|
706 | } |
---|
707 | |
---|
708 | #if 0 |
---|
709 | void |
---|
710 | load_symbols (rld::symbols::table& symbols, |
---|
711 | rld::files::object& object, |
---|
712 | bool local, |
---|
713 | bool weak, |
---|
714 | bool global) |
---|
715 | { |
---|
716 | sections sections; |
---|
717 | get_section_headers (object, sections, SHT_SYMTAB); |
---|
718 | for (sections::iterator si = sections.begin (); |
---|
719 | si != sections.end (); |
---|
720 | ++si) |
---|
721 | load_symbol_table (symbols, object, *si, local, weak, global); |
---|
722 | } |
---|
723 | #endif |
---|
724 | |
---|
725 | } |
---|
726 | } |
---|