gold/tls.h

   1 // tls.h -- Thread-Local Storage utility routines for gold   -*- C++ -*-
   2
   3 // Copyright (C) 2006-2017 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 #ifndef GOLD_TLS_H
  24 #define GOLD_TLS_H
  25
  26 #include "elfcpp.h"
  27 #include "reloc.h"
  28
  29 namespace gold
  30 {
  31
  32 namespace tls
  33 {
  34
  35 // This is used for relocations that can be converted to a different,
  36 // more efficient type of relocation.
  37
  38 enum Tls_optimization
  39 {
  40   TLSOPT_NONE,    // Can not convert this relocation to a more efficient one.
  41   TLSOPT_TO_LD,   // Can convert General Dynamic to Local Dynamic.
  42   TLSOPT_TO_LE,   // Can convert GD or LD to Local-Exec.
  43   TLSOPT_TO_IE,   // Can convert GD or LD or LE to Initial-Exec.
  44 };
  45
  46 // Check the range for a TLS relocation.  This is inlined for efficiency.
  47
  48 template<int size, bool big_endian>
  49 inline void
  50 check_range(const Relocate_info<size, big_endian>* relinfo,
  51             size_t relnum,
  52             typename elfcpp::Elf_types<size>::Elf_Addr rel_offset,
  53             section_size_type view_size, int off)
  54 {
  55   typename elfcpp::Elf_types<size>::Elf_Addr offset = rel_offset + off;
  56   // Elf_Addr is unsigned, so this also tests for signed offset < 0.
  57   if (offset > view_size)
  58     gold_error_at_location(relinfo, relnum, rel_offset,
  59                            _("TLS relocation out of range"));
  60 }
  61
  62 // Check the validity of a TLS relocation.  This is like assert.
  63
  64 template<int size, bool big_endian>
  65 inline void
  66 check_tls(const Relocate_info<size, big_endian>* relinfo,
  67           size_t relnum,
  68           typename elfcpp::Elf_types<size>::Elf_Addr rel_offset,
  69           bool valid)
  70 {
  71   if (!valid)
  72     gold_error_at_location(relinfo, relnum, rel_offset,
  73                            _("TLS relocation against invalid instruction"));
  74 }
  75
  76
  77 } // End namespace tls.
  78
  79 } // End namespace gold.
  80
  81 #endif // !defined(GOLD_TLS_H)