gold/defstd.cc

   1 // defstd.cc -- define standard symbols for gold.
   2
   3 // Copyright 2006, 2007 Free Software Foundation, Inc.
   4 // Written by Ian Lance Taylor <iant@google.com>.
   5
   6 // This file is part of gold.
   7
   8 // This program is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 3 of the License, or
  11 // (at your option) any later version.
  12
  13 // This program is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the Free Software
  20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21 // MA 02110-1301, USA.
  22
  23 #include "gold.h"
  24
  25 #include "symtab.h"
  26 #include "layout.h"
  27 #include "defstd.h"
  28
  29 // This is a simple file which defines the standard symbols like
  30 // "_end".
  31
  32 namespace
  33 {
  34
  35 using namespace gold;
  36
  37 const Define_symbol_in_section in_section[] =
  38 {
  39   {
  40     "__preinit_array_start",    // name
  41     ".preinit_array",           // output_section
  42     0,                          // value
  43     0,                          // size
  44     elfcpp::STT_NOTYPE,         // type
  45     elfcpp::STB_GLOBAL,         // binding
  46     elfcpp::STV_HIDDEN,         // visibility
  47     0,                          // nonvis
  48     false,                      // offset_is_from_end
  49     true                        // only_if_ref
  50   },
  51   {
  52     "__preinit_array_end",      // name
  53     ".preinit_array",           // output_section
  54     0,                          // value
  55     0,                          // size
  56     elfcpp::STT_NOTYPE,         // type
  57     elfcpp::STB_GLOBAL,         // binding
  58     elfcpp::STV_HIDDEN,         // visibility
  59     0,                          // nonvis
  60     true,                       // offset_is_from_end
  61     true                        // only_if_ref
  62   },
  63   {
  64     "__init_array_start",       // name
  65     ".init_array",              // output_section
  66     0,                          // value
  67     0,                          // size
  68     elfcpp::STT_NOTYPE,         // type
  69     elfcpp::STB_GLOBAL,         // binding
  70     elfcpp::STV_HIDDEN,         // visibility
  71     0,                          // nonvis
  72     false,                      // offset_is_from_end
  73     true                        // only_if_ref
  74   },
  75   {
  76     "__init_array_end",         // name
  77     ".init_array",              // output_section
  78     0,                          // value
  79     0,                          // size
  80     elfcpp::STT_NOTYPE,         // type
  81     elfcpp::STB_GLOBAL,         // binding
  82     elfcpp::STV_HIDDEN,         // visibility
  83     0,                          // nonvis
  84     true,                       // offset_is_from_end
  85     true                        // only_if_ref
  86   },
  87   {
  88     "__fini_array_start",       // name
  89     ".fini_array",              // output_section
  90     0,                          // value
  91     0,                          // size
  92     elfcpp::STT_NOTYPE,         // type
  93     elfcpp::STB_GLOBAL,         // binding
  94     elfcpp::STV_HIDDEN,         // visibility
  95     0,                          // nonvis
  96     false,                      // offset_is_from_end
  97     true                        // only_if_ref
  98   },
  99   {
 100     "__fini_array_end",         // name
 101     ".fini_array",              // output_section
 102     0,                          // value
 103     0,                          // size
 104     elfcpp::STT_NOTYPE,         // type
 105     elfcpp::STB_GLOBAL,         // binding
 106     elfcpp::STV_HIDDEN,         // visibility
 107     0,                          // nonvis
 108     true,                       // offset_is_from_end
 109     true                        // only_if_ref
 110   },
 111   {
 112     "__rel_iplt_start",         // name
 113     ".rel.iplt",                // output_section
 114     0,                          // value
 115     0,                          // size
 116     elfcpp::STT_NOTYPE,         // type
 117     elfcpp::STB_GLOBAL,         // binding
 118     elfcpp::STV_HIDDEN,         // visibility
 119     0,                          // nonvis
 120     false,                      // offset_is_from_end
 121     true                        // only_if_ref
 122   },
 123   {
 124     "__rel_iplt_end",           // name
 125     ".rel.iplt",                // output_section
 126     0,                          // value
 127     0,                          // size
 128     elfcpp::STT_NOTYPE,         // type
 129     elfcpp::STB_GLOBAL,         // binding
 130     elfcpp::STV_HIDDEN,         // visibility
 131     0,                          // nonvis
 132     true,                       // offset_is_from_end
 133     true                        // only_if_ref
 134   },
 135   {
 136     "__rela_iplt_start",        // name
 137     ".rela.iplt",               // output_section
 138     0,                          // value
 139     0,                          // size
 140     elfcpp::STT_NOTYPE,         // type
 141     elfcpp::STB_GLOBAL,         // binding
 142     elfcpp::STV_HIDDEN,         // visibility
 143     0,                          // nonvis
 144     false,                      // offset_is_from_end
 145     true                        // only_if_ref
 146   },
 147   {
 148     "__rela_iplt_end",          // name
 149     ".rela.iplt",               // output_section
 150     0,                          // value
 151     0,                          // size
 152     elfcpp::STT_NOTYPE,         // type
 153     elfcpp::STB_GLOBAL,         // binding
 154     elfcpp::STV_HIDDEN,         // visibility
 155     0,                          // nonvis
 156     true,                       // offset_is_from_end
 157     true                        // only_if_ref
 158   },
 159   {
 160     "__stack",                  // name
 161     ".stack",                   // output_section
 162     0,                          // value
 163     0,                          // size
 164     elfcpp::STT_NOTYPE,         // type
 165     elfcpp::STB_GLOBAL,         // binding
 166     elfcpp::STV_DEFAULT,        // visibility
 167     0,                          // nonvis
 168     false,                      // offset_is_from_end
 169     true                        // only_if_ref
 170   },
 171 };
 172
 173 const int in_section_count = sizeof in_section / sizeof in_section[0];
 174
 175 const Define_symbol_in_segment in_segment[] =
 176 {
 177   {
 178     "__executable_start",       // name
 179     elfcpp::PT_LOAD,            // segment_type
 180     elfcpp::PF(0),              // segment_flags_set
 181     elfcpp::PF(0),              // segment_flags_clear
 182     0,                          // value
 183     0,                          // size
 184     elfcpp::STT_NOTYPE,         // type
 185     elfcpp::STB_GLOBAL,         // binding
 186     elfcpp::STV_DEFAULT,        // visibility
 187     0,                          // nonvis
 188     Symbol::SEGMENT_START,      // offset_from_base
 189     true                        // only_if_ref
 190   },
 191   {
 192     "etext",                    // name
 193     elfcpp::PT_LOAD,            // segment_type
 194     elfcpp::PF_X,               // segment_flags_set
 195     elfcpp::PF_W,               // segment_flags_clear
 196     0,                          // value
 197     0,                          // size
 198     elfcpp::STT_NOTYPE,         // type
 199     elfcpp::STB_GLOBAL,         // binding
 200     elfcpp::STV_DEFAULT,        // visibility
 201     0,                          // nonvis
 202     Symbol::SEGMENT_END,        // offset_from_base
 203     true                        // only_if_ref
 204   },
 205   {
 206     "_etext",                   // name
 207     elfcpp::PT_LOAD,            // segment_type
 208     elfcpp::PF_X,               // segment_flags_set
 209     elfcpp::PF_W,               // segment_flags_clear
 210     0,                          // value
 211     0,                          // size
 212     elfcpp::STT_NOTYPE,         // type
 213     elfcpp::STB_GLOBAL,         // binding
 214     elfcpp::STV_DEFAULT,        // visibility
 215     0,                          // nonvis
 216     Symbol::SEGMENT_END,        // offset_from_base
 217     true                        // only_if_ref
 218   },
 219   {
 220     "__etext",                  // name
 221     elfcpp::PT_LOAD,            // segment_type
 222     elfcpp::PF_X,               // segment_flags_set
 223     elfcpp::PF_W,               // segment_flags_clear
 224     0,                          // value
 225     0,                          // size
 226     elfcpp::STT_NOTYPE,         // type
 227     elfcpp::STB_GLOBAL,         // binding
 228     elfcpp::STV_DEFAULT,        // visibility
 229     0,                          // nonvis
 230     Symbol::SEGMENT_END,        // offset_from_base
 231     true                        // only_if_ref
 232   },
 233   {
 234     "_edata",                   // name
 235     elfcpp::PT_LOAD,            // segment_type
 236     elfcpp::PF_W,               // segment_flags_set
 237     elfcpp::PF(0),              // segment_flags_clear
 238     0,                          // value
 239     0,                          // size
 240     elfcpp::STT_NOTYPE,         // type
 241     elfcpp::STB_GLOBAL,         // binding
 242     elfcpp::STV_DEFAULT,        // visibility
 243     0,                          // nonvis
 244     Symbol::SEGMENT_BSS,        // offset_from_base
 245     false                       // only_if_ref
 246   },
 247   {
 248     "edata",                    // name
 249     elfcpp::PT_LOAD,            // segment_type
 250     elfcpp::PF_W,               // segment_flags_set
 251     elfcpp::PF(0),              // segment_flags_clear
 252     0,                          // value
 253     0,                          // size
 254     elfcpp::STT_NOTYPE,         // type
 255     elfcpp::STB_GLOBAL,         // binding
 256     elfcpp::STV_DEFAULT,        // visibility
 257     0,                          // nonvis
 258     Symbol::SEGMENT_BSS,        // offset_from_base
 259     true                        // only_if_ref
 260   },
 261   {
 262     "__bss_start",              // name
 263     elfcpp::PT_LOAD,            // segment_type
 264     elfcpp::PF_W,               // segment_flags_set
 265     elfcpp::PF(0),              // segment_flags_clear
 266     0,                          // value
 267     0,                          // size
 268     elfcpp::STT_NOTYPE,         // type
 269     elfcpp::STB_GLOBAL,         // binding
 270     elfcpp::STV_DEFAULT,        // visibility
 271     0,                          // nonvis
 272     Symbol::SEGMENT_BSS,        // offset_from_base
 273     false                       // only_if_ref
 274   },
 275   {
 276     "_end",                     // name
 277     elfcpp::PT_LOAD,            // segment_type
 278     elfcpp::PF_W,               // segment_flags_set
 279     elfcpp::PF(0),              // segment_flags_clear
 280     0,                          // value
 281     0,                          // size
 282     elfcpp::STT_NOTYPE,         // type
 283     elfcpp::STB_GLOBAL,         // binding
 284     elfcpp::STV_DEFAULT,        // visibility
 285     0,                          // nonvis
 286     Symbol::SEGMENT_END,        // offset_from_base
 287     false                       // only_if_ref
 288   },
 289   {
 290     "end",                      // name
 291     elfcpp::PT_LOAD,            // segment_type
 292     elfcpp::PF_W,               // segment_flags_set
 293     elfcpp::PF(0),              // segment_flags_clear
 294     0,                          // value
 295     0,                          // size
 296     elfcpp::STT_NOTYPE,         // type
 297     elfcpp::STB_GLOBAL,         // binding
 298     elfcpp::STV_DEFAULT,        // visibility
 299     0,                          // nonvis
 300     Symbol::SEGMENT_END,        // offset_from_base
 301     false                       // only_if_ref
 302   }
 303 };
 304
 305 const int in_segment_count = sizeof in_segment / sizeof in_segment[0];
 306
 307 } // End anonymous namespace.
 308
 309 namespace gold
 310 {
 311
 312 void
 313 define_standard_symbols(Symbol_table* symtab, const Layout* layout)
 314 {
 315   bool saw_sections_clause = layout->script_options()->saw_sections_clause();
 316   symtab->define_symbols(layout, in_section_count, in_section,
 317                          saw_sections_clause);
 318   symtab->define_symbols(layout, in_segment_count, in_segment,
 319                          saw_sections_clause);
 320 }
 321
 322 } // End namespace gold.