mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-09 04:21:49 +08:00
83896202bf
(Relobj::local_plt_offset): New function. (Relobj::local_has_got_offset): New function. (Relobj::local_got_offset): New function. (Relobj::set_local_got_offset): New function. (Relobj::do_local_symbol_value): New pure virtual function. (Relobj::do_local_plt_offset): Likewise. (Relobj::do_local_has_got_offset): Likewise. (Relobj::do_local_got_offset): Likewise. (Relobj::do_set_local_got_offset): Likewise. (Sized_relobj::do_local_has_got_offset): Rename from local_has_got_offset. (Sized_relobj::do_local_got_offset): Rename from local_got_offset. (Sized_relobj::do_set_local_got_offset): Rename from set_local_got_offset. (Sized_relobj_file::do_local_plt_offset): Rename from local_plt_offset. (Sized_relobj_file::do_local_symbol_value): New function. * object.cc (Sized_relobj_file::do_local_plt_offset): Rename from local_plt_offset. * output.cc (Output_data_got::Got_entry::write): Change object to Relobj. Use local_symbol_value. (Output_data_got::add_global_with_rel): Change rel_dyn to Output_data_reloc_generic*. Use add_global_generic. (Output_data_got::add_global_with_rela): Remove. Change all callers to use add_global_with_rel. (Output_data_got::add_global_pair_with_rel): Change rel_dyn to Output_data_reloc_generic*. Use add_global_generic. (Output_data_got::add_global_pair_with_rela): Remove. Change all callers to use add_global_pair_with_rel. (Output_data_got::add_local): Change object to Relobj*. (Output_data_got::add_local_plt): Likewise. (Output_data_got::add_local_with_rel): Change object to Relobj*, change rel_dyn to Output_data_reloc_generic*. Use add_local_generic. (Output_data_got::add_local_with_rela): Remove. Change all callers to use all_local_with_rel. (Output_data_got::add_local_pair_with_rel): Change object to Relobj*, change rel_dyn to Output_data_reloc_generic*. Use add_output_section_generic. (Output_data_got::add_local_pair_with_rela): Remove. Change all callers to use add_local_pair_with_rel. (Output_data_got::reserve_local): Change object to Relobj*. * output.h: (class Output_data_reloc_generic): Add pure virtual declarations for add_global_generic, add_local_generic, add_output_section_generic. (class Output_data_reloc) [SHT_REL, SHT_RELA]: Implement new functions for Output_data_reloc_generic. Update declarations for changes listed in output.cc. (class Output_data_got): Change template parameter to got_size. Don't define Rel_dyn or Rela_dyn. Update declarations per above. * incremental.h (Sized_relobj_incr::do_local_symbol_value): New function. (Sized_relobj_incr::do_local_plt_offset): New function. * copy-relocs.cc (Copy_relocs::Copy_reloc_entry::emit): Call add_global_generic.
259 lines
7.8 KiB
C++
259 lines
7.8 KiB
C++
// copy-relocs.cc -- handle COPY relocations for gold.
|
|
|
|
// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
|
|
// Written by Ian Lance Taylor <iant@google.com>.
|
|
|
|
// This file is part of gold.
|
|
|
|
// This program is free software; you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation; either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, write to the Free Software
|
|
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
|
|
// MA 02110-1301, USA.
|
|
|
|
#include "gold.h"
|
|
|
|
#include "symtab.h"
|
|
#include "copy-relocs.h"
|
|
|
|
namespace gold
|
|
{
|
|
|
|
// Copy_relocs::Copy_reloc_entry methods.
|
|
|
|
// Emit the reloc if appropriate.
|
|
|
|
template<int sh_type, int size, bool big_endian>
|
|
void
|
|
Copy_relocs<sh_type, size, big_endian>::Copy_reloc_entry::emit(
|
|
Output_data_reloc<sh_type, true, size, big_endian>* reloc_section)
|
|
{
|
|
// If the symbol is no longer defined in a dynamic object, then we
|
|
// emitted a COPY relocation, and we do not want to emit this
|
|
// dynamic relocation.
|
|
if (this->sym_->is_from_dynobj())
|
|
reloc_section->add_global_generic(this->sym_, this->reloc_type_,
|
|
this->output_section_, this->relobj_,
|
|
this->shndx_, this->address_,
|
|
this->addend_);
|
|
}
|
|
|
|
// Copy_relocs methods.
|
|
|
|
// Handle a relocation against a symbol which may force us to generate
|
|
// a COPY reloc.
|
|
|
|
template<int sh_type, int size, bool big_endian>
|
|
void
|
|
Copy_relocs<sh_type, size, big_endian>::copy_reloc(
|
|
Symbol_table* symtab,
|
|
Layout* layout,
|
|
Sized_symbol<size>* sym,
|
|
Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int shndx,
|
|
Output_section* output_section,
|
|
const Reloc& rel,
|
|
Output_data_reloc<sh_type, true, size, big_endian>* reloc_section)
|
|
{
|
|
if (this->need_copy_reloc(sym, object, shndx))
|
|
this->make_copy_reloc(symtab, layout, sym, reloc_section);
|
|
else
|
|
{
|
|
// We may not need a COPY relocation. Save this relocation to
|
|
// possibly be emitted later.
|
|
this->save(sym, object, shndx, output_section, rel);
|
|
}
|
|
}
|
|
|
|
// Return whether we need a COPY reloc for a relocation against SYM.
|
|
// The relocation is begin applied to section SHNDX in OBJECT.
|
|
|
|
template<int sh_type, int size, bool big_endian>
|
|
bool
|
|
Copy_relocs<sh_type, size, big_endian>::need_copy_reloc(
|
|
Sized_symbol<size>* sym,
|
|
Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int shndx) const
|
|
{
|
|
if (!parameters->options().copyreloc())
|
|
return false;
|
|
|
|
if (sym->symsize() == 0)
|
|
return false;
|
|
|
|
// If this is a readonly section, then we need a COPY reloc.
|
|
// Otherwise we can use a dynamic reloc. Note that calling
|
|
// section_flags here can be slow, as the information is not cached;
|
|
// fortunately we shouldn't see too many potential COPY relocs.
|
|
if ((object->section_flags(shndx) & elfcpp::SHF_WRITE) == 0)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
// Emit a COPY relocation for SYM.
|
|
|
|
template<int sh_type, int size, bool big_endian>
|
|
void
|
|
Copy_relocs<sh_type, size, big_endian>::emit_copy_reloc(
|
|
Symbol_table* symtab,
|
|
Sized_symbol<size>* sym,
|
|
Output_data* posd,
|
|
off_t offset,
|
|
Output_data_reloc<sh_type, true, size, big_endian>* reloc_section)
|
|
{
|
|
// Define the symbol as being copied.
|
|
symtab->define_with_copy_reloc(sym, posd, offset);
|
|
|
|
// Add the COPY relocation to the dynamic reloc section.
|
|
reloc_section->add_global_generic(sym, this->copy_reloc_type_, posd,
|
|
offset, 0);
|
|
}
|
|
|
|
// Make a COPY relocation for SYM and emit it.
|
|
|
|
template<int sh_type, int size, bool big_endian>
|
|
void
|
|
Copy_relocs<sh_type, size, big_endian>::make_copy_reloc(
|
|
Symbol_table* symtab,
|
|
Layout* layout,
|
|
Sized_symbol<size>* sym,
|
|
Output_data_reloc<sh_type, true, size, big_endian>* reloc_section)
|
|
{
|
|
// We should not be here if -z nocopyreloc is given.
|
|
gold_assert(parameters->options().copyreloc());
|
|
|
|
typename elfcpp::Elf_types<size>::Elf_WXword symsize = sym->symsize();
|
|
|
|
// There is no defined way to determine the required alignment of
|
|
// the symbol. We know that the symbol is defined in a dynamic
|
|
// object. We start with the alignment of the section in which it
|
|
// is defined; presumably we do not require an alignment larger than
|
|
// that. Then we reduce that alignment if the symbol is not aligned
|
|
// within the section.
|
|
gold_assert(sym->is_from_dynobj());
|
|
bool is_ordinary;
|
|
unsigned int shndx = sym->shndx(&is_ordinary);
|
|
gold_assert(is_ordinary);
|
|
typename elfcpp::Elf_types<size>::Elf_WXword addralign;
|
|
|
|
{
|
|
// Lock the object so we can read from it. This is only called
|
|
// single-threaded from scan_relocs, so it is OK to lock.
|
|
// Unfortunately we have no way to pass in a Task token.
|
|
const Task* dummy_task = reinterpret_cast<const Task*>(-1);
|
|
Object* obj = sym->object();
|
|
Task_lock_obj<Object> tl(dummy_task, obj);
|
|
addralign = obj->section_addralign(shndx);
|
|
}
|
|
|
|
typename Sized_symbol<size>::Value_type value = sym->value();
|
|
while ((value & (addralign - 1)) != 0)
|
|
addralign >>= 1;
|
|
|
|
// Mark the dynamic object as needed for the --as-needed option.
|
|
sym->object()->set_is_needed();
|
|
|
|
if (this->dynbss_ == NULL)
|
|
{
|
|
this->dynbss_ = new Output_data_space(addralign, "** dynbss");
|
|
layout->add_output_section_data(".bss",
|
|
elfcpp::SHT_NOBITS,
|
|
elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
|
|
this->dynbss_, ORDER_BSS, false);
|
|
}
|
|
|
|
Output_data_space* dynbss = this->dynbss_;
|
|
|
|
if (addralign > dynbss->addralign())
|
|
dynbss->set_space_alignment(addralign);
|
|
|
|
section_size_type dynbss_size =
|
|
convert_to_section_size_type(dynbss->current_data_size());
|
|
dynbss_size = align_address(dynbss_size, addralign);
|
|
section_size_type offset = dynbss_size;
|
|
dynbss->set_current_data_size(dynbss_size + symsize);
|
|
|
|
this->emit_copy_reloc(symtab, sym, dynbss, offset, reloc_section);
|
|
}
|
|
|
|
// Save a relocation to possibly be emitted later.
|
|
|
|
template<int sh_type, int size, bool big_endian>
|
|
void
|
|
Copy_relocs<sh_type, size, big_endian>::save(
|
|
Symbol* sym,
|
|
Sized_relobj_file<size, big_endian>* object,
|
|
unsigned int shndx,
|
|
Output_section* output_section,
|
|
const Reloc& rel)
|
|
{
|
|
unsigned int reloc_type = elfcpp::elf_r_type<size>(rel.get_r_info());
|
|
typename elfcpp::Elf_types<size>::Elf_Addr addend =
|
|
Reloc_types<sh_type, size, big_endian>::get_reloc_addend_noerror(&rel);
|
|
this->entries_.push_back(Copy_reloc_entry(sym, reloc_type, object, shndx,
|
|
output_section, rel.get_r_offset(),
|
|
addend));
|
|
}
|
|
|
|
// Emit any saved relocs.
|
|
|
|
template<int sh_type, int size, bool big_endian>
|
|
void
|
|
Copy_relocs<sh_type, size, big_endian>::emit(
|
|
Output_data_reloc<sh_type, true, size, big_endian>* reloc_section)
|
|
{
|
|
for (typename Copy_reloc_entries::iterator p = this->entries_.begin();
|
|
p != this->entries_.end();
|
|
++p)
|
|
p->emit(reloc_section);
|
|
|
|
// We no longer need the saved information.
|
|
this->entries_.clear();
|
|
}
|
|
|
|
// Instantiate the templates we need.
|
|
|
|
#ifdef HAVE_TARGET_32_LITTLE
|
|
template
|
|
class Copy_relocs<elfcpp::SHT_REL, 32, false>;
|
|
|
|
template
|
|
class Copy_relocs<elfcpp::SHT_RELA, 32, false>;
|
|
#endif
|
|
|
|
#ifdef HAVE_TARGET_32_BIG
|
|
template
|
|
class Copy_relocs<elfcpp::SHT_REL, 32, true>;
|
|
|
|
template
|
|
class Copy_relocs<elfcpp::SHT_RELA, 32, true>;
|
|
#endif
|
|
|
|
#ifdef HAVE_TARGET_64_LITTLE
|
|
template
|
|
class Copy_relocs<elfcpp::SHT_REL, 64, false>;
|
|
|
|
template
|
|
class Copy_relocs<elfcpp::SHT_RELA, 64, false>;
|
|
#endif
|
|
|
|
#ifdef HAVE_TARGET_64_BIG
|
|
template
|
|
class Copy_relocs<elfcpp::SHT_REL, 64, true>;
|
|
|
|
template
|
|
class Copy_relocs<elfcpp::SHT_RELA, 64, true>;
|
|
#endif
|
|
|
|
} // End namespace gold.
|