3124 lines
91 KiB
C++
3124 lines
91 KiB
C++
// output.h -- manage the output file for gold -*- C++ -*-
|
|
|
|
// Copyright 2006, 2007, 2008 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.
|
|
|
|
#ifndef GOLD_OUTPUT_H
|
|
#define GOLD_OUTPUT_H
|
|
|
|
#include <list>
|
|
#include <vector>
|
|
|
|
#include "elfcpp.h"
|
|
#include "mapfile.h"
|
|
#include "layout.h"
|
|
#include "reloc-types.h"
|
|
|
|
namespace gold
|
|
{
|
|
|
|
class General_options;
|
|
class Object;
|
|
class Symbol;
|
|
class Output_file;
|
|
class Output_section;
|
|
class Relocatable_relocs;
|
|
class Target;
|
|
template<int size, bool big_endian>
|
|
class Sized_target;
|
|
template<int size, bool big_endian>
|
|
class Sized_relobj;
|
|
|
|
// An abtract class for data which has to go into the output file.
|
|
|
|
class Output_data
|
|
{
|
|
public:
|
|
explicit Output_data()
|
|
: address_(0), data_size_(0), offset_(-1),
|
|
is_address_valid_(false), is_data_size_valid_(false),
|
|
is_offset_valid_(false),
|
|
dynamic_reloc_count_(0)
|
|
{ }
|
|
|
|
virtual
|
|
~Output_data();
|
|
|
|
// Return the address. For allocated sections, this is only valid
|
|
// after Layout::finalize is finished.
|
|
uint64_t
|
|
address() const
|
|
{
|
|
gold_assert(this->is_address_valid_);
|
|
return this->address_;
|
|
}
|
|
|
|
// Return the size of the data. For allocated sections, this must
|
|
// be valid after Layout::finalize calls set_address, but need not
|
|
// be valid before then.
|
|
off_t
|
|
data_size() const
|
|
{
|
|
gold_assert(this->is_data_size_valid_);
|
|
return this->data_size_;
|
|
}
|
|
|
|
// Return the file offset. This is only valid after
|
|
// Layout::finalize is finished. For some non-allocated sections,
|
|
// it may not be valid until near the end of the link.
|
|
off_t
|
|
offset() const
|
|
{
|
|
gold_assert(this->is_offset_valid_);
|
|
return this->offset_;
|
|
}
|
|
|
|
// Reset the address and file offset. This essentially disables the
|
|
// sanity testing about duplicate and unknown settings.
|
|
void
|
|
reset_address_and_file_offset()
|
|
{
|
|
this->is_address_valid_ = false;
|
|
this->is_offset_valid_ = false;
|
|
this->is_data_size_valid_ = false;
|
|
this->do_reset_address_and_file_offset();
|
|
}
|
|
|
|
// Return the required alignment.
|
|
uint64_t
|
|
addralign() const
|
|
{ return this->do_addralign(); }
|
|
|
|
// Return whether this has a load address.
|
|
bool
|
|
has_load_address() const
|
|
{ return this->do_has_load_address(); }
|
|
|
|
// Return the load address.
|
|
uint64_t
|
|
load_address() const
|
|
{ return this->do_load_address(); }
|
|
|
|
// Return whether this is an Output_section.
|
|
bool
|
|
is_section() const
|
|
{ return this->do_is_section(); }
|
|
|
|
// Return whether this is an Output_section of the specified type.
|
|
bool
|
|
is_section_type(elfcpp::Elf_Word stt) const
|
|
{ return this->do_is_section_type(stt); }
|
|
|
|
// Return whether this is an Output_section with the specified flag
|
|
// set.
|
|
bool
|
|
is_section_flag_set(elfcpp::Elf_Xword shf) const
|
|
{ return this->do_is_section_flag_set(shf); }
|
|
|
|
// Return the output section that this goes in, if there is one.
|
|
Output_section*
|
|
output_section()
|
|
{ return this->do_output_section(); }
|
|
|
|
// Return the output section index, if there is an output section.
|
|
unsigned int
|
|
out_shndx() const
|
|
{ return this->do_out_shndx(); }
|
|
|
|
// Set the output section index, if this is an output section.
|
|
void
|
|
set_out_shndx(unsigned int shndx)
|
|
{ this->do_set_out_shndx(shndx); }
|
|
|
|
// Set the address and file offset of this data, and finalize the
|
|
// size of the data. This is called during Layout::finalize for
|
|
// allocated sections.
|
|
void
|
|
set_address_and_file_offset(uint64_t addr, off_t off)
|
|
{
|
|
this->set_address(addr);
|
|
this->set_file_offset(off);
|
|
this->finalize_data_size();
|
|
}
|
|
|
|
// Set the address.
|
|
void
|
|
set_address(uint64_t addr)
|
|
{
|
|
gold_assert(!this->is_address_valid_);
|
|
this->address_ = addr;
|
|
this->is_address_valid_ = true;
|
|
}
|
|
|
|
// Set the file offset.
|
|
void
|
|
set_file_offset(off_t off)
|
|
{
|
|
gold_assert(!this->is_offset_valid_);
|
|
this->offset_ = off;
|
|
this->is_offset_valid_ = true;
|
|
}
|
|
|
|
// Finalize the data size.
|
|
void
|
|
finalize_data_size()
|
|
{
|
|
if (!this->is_data_size_valid_)
|
|
{
|
|
// Tell the child class to set the data size.
|
|
this->set_final_data_size();
|
|
gold_assert(this->is_data_size_valid_);
|
|
}
|
|
}
|
|
|
|
// Set the TLS offset. Called only for SHT_TLS sections.
|
|
void
|
|
set_tls_offset(uint64_t tls_base)
|
|
{ this->do_set_tls_offset(tls_base); }
|
|
|
|
// Return the TLS offset, relative to the base of the TLS segment.
|
|
// Valid only for SHT_TLS sections.
|
|
uint64_t
|
|
tls_offset() const
|
|
{ return this->do_tls_offset(); }
|
|
|
|
// Write the data to the output file. This is called after
|
|
// Layout::finalize is complete.
|
|
void
|
|
write(Output_file* file)
|
|
{ this->do_write(file); }
|
|
|
|
// This is called by Layout::finalize to note that the sizes of
|
|
// allocated sections must now be fixed.
|
|
static void
|
|
layout_complete()
|
|
{ Output_data::allocated_sizes_are_fixed = true; }
|
|
|
|
// Used to check that layout has been done.
|
|
static bool
|
|
is_layout_complete()
|
|
{ return Output_data::allocated_sizes_are_fixed; }
|
|
|
|
// Count the number of dynamic relocations applied to this section.
|
|
void
|
|
add_dynamic_reloc()
|
|
{ ++this->dynamic_reloc_count_; }
|
|
|
|
// Return the number of dynamic relocations applied to this section.
|
|
unsigned int
|
|
dynamic_reloc_count() const
|
|
{ return this->dynamic_reloc_count_; }
|
|
|
|
// Whether the address is valid.
|
|
bool
|
|
is_address_valid() const
|
|
{ return this->is_address_valid_; }
|
|
|
|
// Whether the file offset is valid.
|
|
bool
|
|
is_offset_valid() const
|
|
{ return this->is_offset_valid_; }
|
|
|
|
// Whether the data size is valid.
|
|
bool
|
|
is_data_size_valid() const
|
|
{ return this->is_data_size_valid_; }
|
|
|
|
// Print information to the map file.
|
|
void
|
|
print_to_mapfile(Mapfile* mapfile) const
|
|
{ return this->do_print_to_mapfile(mapfile); }
|
|
|
|
protected:
|
|
// Functions that child classes may or in some cases must implement.
|
|
|
|
// Write the data to the output file.
|
|
virtual void
|
|
do_write(Output_file*) = 0;
|
|
|
|
// Return the required alignment.
|
|
virtual uint64_t
|
|
do_addralign() const = 0;
|
|
|
|
// Return whether this has a load address.
|
|
virtual bool
|
|
do_has_load_address() const
|
|
{ return false; }
|
|
|
|
// Return the load address.
|
|
virtual uint64_t
|
|
do_load_address() const
|
|
{ gold_unreachable(); }
|
|
|
|
// Return whether this is an Output_section.
|
|
virtual bool
|
|
do_is_section() const
|
|
{ return false; }
|
|
|
|
// Return whether this is an Output_section of the specified type.
|
|
// This only needs to be implement by Output_section.
|
|
virtual bool
|
|
do_is_section_type(elfcpp::Elf_Word) const
|
|
{ return false; }
|
|
|
|
// Return whether this is an Output_section with the specific flag
|
|
// set. This only needs to be implemented by Output_section.
|
|
virtual bool
|
|
do_is_section_flag_set(elfcpp::Elf_Xword) const
|
|
{ return false; }
|
|
|
|
// Return the output section, if there is one.
|
|
virtual Output_section*
|
|
do_output_section()
|
|
{ return NULL; }
|
|
|
|
// Return the output section index, if there is an output section.
|
|
virtual unsigned int
|
|
do_out_shndx() const
|
|
{ gold_unreachable(); }
|
|
|
|
// Set the output section index, if this is an output section.
|
|
virtual void
|
|
do_set_out_shndx(unsigned int)
|
|
{ gold_unreachable(); }
|
|
|
|
// This is a hook for derived classes to set the data size. This is
|
|
// called by finalize_data_size, normally called during
|
|
// Layout::finalize, when the section address is set.
|
|
virtual void
|
|
set_final_data_size()
|
|
{ gold_unreachable(); }
|
|
|
|
// A hook for resetting the address and file offset.
|
|
virtual void
|
|
do_reset_address_and_file_offset()
|
|
{ }
|
|
|
|
// Set the TLS offset. Called only for SHT_TLS sections.
|
|
virtual void
|
|
do_set_tls_offset(uint64_t)
|
|
{ gold_unreachable(); }
|
|
|
|
// Return the TLS offset, relative to the base of the TLS segment.
|
|
// Valid only for SHT_TLS sections.
|
|
virtual uint64_t
|
|
do_tls_offset() const
|
|
{ gold_unreachable(); }
|
|
|
|
// Print to the map file. This only needs to be implemented by
|
|
// classes which may appear in a PT_LOAD segment.
|
|
virtual void
|
|
do_print_to_mapfile(Mapfile*) const
|
|
{ gold_unreachable(); }
|
|
|
|
// Functions that child classes may call.
|
|
|
|
// Set the size of the data.
|
|
void
|
|
set_data_size(off_t data_size)
|
|
{
|
|
gold_assert(!this->is_data_size_valid_);
|
|
this->data_size_ = data_size;
|
|
this->is_data_size_valid_ = true;
|
|
}
|
|
|
|
// Get the current data size--this is for the convenience of
|
|
// sections which build up their size over time.
|
|
off_t
|
|
current_data_size_for_child() const
|
|
{ return this->data_size_; }
|
|
|
|
// Set the current data size--this is for the convenience of
|
|
// sections which build up their size over time.
|
|
void
|
|
set_current_data_size_for_child(off_t data_size)
|
|
{
|
|
gold_assert(!this->is_data_size_valid_);
|
|
this->data_size_ = data_size;
|
|
}
|
|
|
|
// Return default alignment for the target size.
|
|
static uint64_t
|
|
default_alignment();
|
|
|
|
// Return default alignment for a specified size--32 or 64.
|
|
static uint64_t
|
|
default_alignment_for_size(int size);
|
|
|
|
private:
|
|
Output_data(const Output_data&);
|
|
Output_data& operator=(const Output_data&);
|
|
|
|
// This is used for verification, to make sure that we don't try to
|
|
// change any sizes of allocated sections after we set the section
|
|
// addresses.
|
|
static bool allocated_sizes_are_fixed;
|
|
|
|
// Memory address in output file.
|
|
uint64_t address_;
|
|
// Size of data in output file.
|
|
off_t data_size_;
|
|
// File offset of contents in output file.
|
|
off_t offset_;
|
|
// Whether address_ is valid.
|
|
bool is_address_valid_;
|
|
// Whether data_size_ is valid.
|
|
bool is_data_size_valid_;
|
|
// Whether offset_ is valid.
|
|
bool is_offset_valid_;
|
|
// Count of dynamic relocations applied to this section.
|
|
unsigned int dynamic_reloc_count_;
|
|
};
|
|
|
|
// Output the section headers.
|
|
|
|
class Output_section_headers : public Output_data
|
|
{
|
|
public:
|
|
Output_section_headers(const Layout*,
|
|
const Layout::Segment_list*,
|
|
const Layout::Section_list*,
|
|
const Layout::Section_list*,
|
|
const Stringpool*,
|
|
const Output_section*);
|
|
|
|
protected:
|
|
// Write the data to the file.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Return the required alignment.
|
|
uint64_t
|
|
do_addralign() const
|
|
{ return Output_data::default_alignment(); }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** section headers")); }
|
|
|
|
private:
|
|
// Write the data to the file with the right size and endianness.
|
|
template<int size, bool big_endian>
|
|
void
|
|
do_sized_write(Output_file*);
|
|
|
|
const Layout* layout_;
|
|
const Layout::Segment_list* segment_list_;
|
|
const Layout::Section_list* section_list_;
|
|
const Layout::Section_list* unattached_section_list_;
|
|
const Stringpool* secnamepool_;
|
|
const Output_section* shstrtab_section_;
|
|
};
|
|
|
|
// Output the segment headers.
|
|
|
|
class Output_segment_headers : public Output_data
|
|
{
|
|
public:
|
|
Output_segment_headers(const Layout::Segment_list& segment_list);
|
|
|
|
protected:
|
|
// Write the data to the file.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Return the required alignment.
|
|
uint64_t
|
|
do_addralign() const
|
|
{ return Output_data::default_alignment(); }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** segment headers")); }
|
|
|
|
private:
|
|
// Write the data to the file with the right size and endianness.
|
|
template<int size, bool big_endian>
|
|
void
|
|
do_sized_write(Output_file*);
|
|
|
|
const Layout::Segment_list& segment_list_;
|
|
};
|
|
|
|
// Output the ELF file header.
|
|
|
|
class Output_file_header : public Output_data
|
|
{
|
|
public:
|
|
Output_file_header(const Target*,
|
|
const Symbol_table*,
|
|
const Output_segment_headers*,
|
|
const char* entry);
|
|
|
|
// Add information about the section headers. We lay out the ELF
|
|
// file header before we create the section headers.
|
|
void set_section_info(const Output_section_headers*,
|
|
const Output_section* shstrtab);
|
|
|
|
protected:
|
|
// Write the data to the file.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Return the required alignment.
|
|
uint64_t
|
|
do_addralign() const
|
|
{ return Output_data::default_alignment(); }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** file header")); }
|
|
|
|
private:
|
|
// Write the data to the file with the right size and endianness.
|
|
template<int size, bool big_endian>
|
|
void
|
|
do_sized_write(Output_file*);
|
|
|
|
// Return the value to use for the entry address.
|
|
template<int size>
|
|
typename elfcpp::Elf_types<size>::Elf_Addr
|
|
entry();
|
|
|
|
const Target* target_;
|
|
const Symbol_table* symtab_;
|
|
const Output_segment_headers* segment_header_;
|
|
const Output_section_headers* section_header_;
|
|
const Output_section* shstrtab_;
|
|
const char* entry_;
|
|
};
|
|
|
|
// Output sections are mainly comprised of input sections. However,
|
|
// there are cases where we have data to write out which is not in an
|
|
// input section. Output_section_data is used in such cases. This is
|
|
// an abstract base class.
|
|
|
|
class Output_section_data : public Output_data
|
|
{
|
|
public:
|
|
Output_section_data(off_t data_size, uint64_t addralign)
|
|
: Output_data(), output_section_(NULL), addralign_(addralign)
|
|
{ this->set_data_size(data_size); }
|
|
|
|
Output_section_data(uint64_t addralign)
|
|
: Output_data(), output_section_(NULL), addralign_(addralign)
|
|
{ }
|
|
|
|
// Return the output section.
|
|
const Output_section*
|
|
output_section() const
|
|
{ return this->output_section_; }
|
|
|
|
// Record the output section.
|
|
void
|
|
set_output_section(Output_section* os);
|
|
|
|
// Add an input section, for SHF_MERGE sections. This returns true
|
|
// if the section was handled.
|
|
bool
|
|
add_input_section(Relobj* object, unsigned int shndx)
|
|
{ return this->do_add_input_section(object, shndx); }
|
|
|
|
// Given an input OBJECT, an input section index SHNDX within that
|
|
// object, and an OFFSET relative to the start of that input
|
|
// section, return whether or not the corresponding offset within
|
|
// the output section is known. If this function returns true, it
|
|
// sets *POUTPUT to the output offset. The value -1 indicates that
|
|
// this input offset is being discarded.
|
|
bool
|
|
output_offset(const Relobj* object, unsigned int shndx,
|
|
section_offset_type offset,
|
|
section_offset_type *poutput) const
|
|
{ return this->do_output_offset(object, shndx, offset, poutput); }
|
|
|
|
// Return whether this is the merge section for the input section
|
|
// SHNDX in OBJECT. This should return true when output_offset
|
|
// would return true for some values of OFFSET.
|
|
bool
|
|
is_merge_section_for(const Relobj* object, unsigned int shndx) const
|
|
{ return this->do_is_merge_section_for(object, shndx); }
|
|
|
|
// Write the contents to a buffer. This is used for sections which
|
|
// require postprocessing, such as compression.
|
|
void
|
|
write_to_buffer(unsigned char* buffer)
|
|
{ this->do_write_to_buffer(buffer); }
|
|
|
|
// Print merge stats to stderr. This should only be called for
|
|
// SHF_MERGE sections.
|
|
void
|
|
print_merge_stats(const char* section_name)
|
|
{ this->do_print_merge_stats(section_name); }
|
|
|
|
protected:
|
|
// The child class must implement do_write.
|
|
|
|
// The child class may implement specific adjustments to the output
|
|
// section.
|
|
virtual void
|
|
do_adjust_output_section(Output_section*)
|
|
{ }
|
|
|
|
// May be implemented by child class. Return true if the section
|
|
// was handled.
|
|
virtual bool
|
|
do_add_input_section(Relobj*, unsigned int)
|
|
{ gold_unreachable(); }
|
|
|
|
// The child class may implement output_offset.
|
|
virtual bool
|
|
do_output_offset(const Relobj*, unsigned int, section_offset_type,
|
|
section_offset_type*) const
|
|
{ return false; }
|
|
|
|
// The child class may implement is_merge_section_for.
|
|
virtual bool
|
|
do_is_merge_section_for(const Relobj*, unsigned int) const
|
|
{ return false; }
|
|
|
|
// The child class may implement write_to_buffer. Most child
|
|
// classes can not appear in a compressed section, and they do not
|
|
// implement this.
|
|
virtual void
|
|
do_write_to_buffer(unsigned char*)
|
|
{ gold_unreachable(); }
|
|
|
|
// Print merge statistics.
|
|
virtual void
|
|
do_print_merge_stats(const char*)
|
|
{ gold_unreachable(); }
|
|
|
|
// Return the required alignment.
|
|
uint64_t
|
|
do_addralign() const
|
|
{ return this->addralign_; }
|
|
|
|
// Return the output section.
|
|
Output_section*
|
|
do_output_section()
|
|
{ return this->output_section_; }
|
|
|
|
// Return the section index of the output section.
|
|
unsigned int
|
|
do_out_shndx() const;
|
|
|
|
// Set the alignment.
|
|
void
|
|
set_addralign(uint64_t addralign);
|
|
|
|
private:
|
|
// The output section for this section.
|
|
Output_section* output_section_;
|
|
// The required alignment.
|
|
uint64_t addralign_;
|
|
};
|
|
|
|
// Some Output_section_data classes build up their data step by step,
|
|
// rather than all at once. This class provides an interface for
|
|
// them.
|
|
|
|
class Output_section_data_build : public Output_section_data
|
|
{
|
|
public:
|
|
Output_section_data_build(uint64_t addralign)
|
|
: Output_section_data(addralign)
|
|
{ }
|
|
|
|
// Get the current data size.
|
|
off_t
|
|
current_data_size() const
|
|
{ return this->current_data_size_for_child(); }
|
|
|
|
// Set the current data size.
|
|
void
|
|
set_current_data_size(off_t data_size)
|
|
{ this->set_current_data_size_for_child(data_size); }
|
|
|
|
protected:
|
|
// Set the final data size.
|
|
virtual void
|
|
set_final_data_size()
|
|
{ this->set_data_size(this->current_data_size_for_child()); }
|
|
};
|
|
|
|
// A simple case of Output_data in which we have constant data to
|
|
// output.
|
|
|
|
class Output_data_const : public Output_section_data
|
|
{
|
|
public:
|
|
Output_data_const(const std::string& data, uint64_t addralign)
|
|
: Output_section_data(data.size(), addralign), data_(data)
|
|
{ }
|
|
|
|
Output_data_const(const char* p, off_t len, uint64_t addralign)
|
|
: Output_section_data(len, addralign), data_(p, len)
|
|
{ }
|
|
|
|
Output_data_const(const unsigned char* p, off_t len, uint64_t addralign)
|
|
: Output_section_data(len, addralign),
|
|
data_(reinterpret_cast<const char*>(p), len)
|
|
{ }
|
|
|
|
protected:
|
|
// Write the data to the output file.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Write the data to a buffer.
|
|
void
|
|
do_write_to_buffer(unsigned char* buffer)
|
|
{ memcpy(buffer, this->data_.data(), this->data_.size()); }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** fill")); }
|
|
|
|
private:
|
|
std::string data_;
|
|
};
|
|
|
|
// Another version of Output_data with constant data, in which the
|
|
// buffer is allocated by the caller.
|
|
|
|
class Output_data_const_buffer : public Output_section_data
|
|
{
|
|
public:
|
|
Output_data_const_buffer(const unsigned char* p, off_t len,
|
|
uint64_t addralign, const char* map_name)
|
|
: Output_section_data(len, addralign),
|
|
p_(p), map_name_(map_name)
|
|
{ }
|
|
|
|
protected:
|
|
// Write the data the output file.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Write the data to a buffer.
|
|
void
|
|
do_write_to_buffer(unsigned char* buffer)
|
|
{ memcpy(buffer, this->p_, this->data_size()); }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _(this->map_name_)); }
|
|
|
|
private:
|
|
// The data to output.
|
|
const unsigned char* p_;
|
|
// Name to use in a map file. Maps are a rarely used feature, but
|
|
// the space usage is minor as aren't very many of these objects.
|
|
const char* map_name_;
|
|
};
|
|
|
|
// A place holder for a fixed amount of data written out via some
|
|
// other mechanism.
|
|
|
|
class Output_data_fixed_space : public Output_section_data
|
|
{
|
|
public:
|
|
Output_data_fixed_space(off_t data_size, uint64_t addralign,
|
|
const char* map_name)
|
|
: Output_section_data(data_size, addralign),
|
|
map_name_(map_name)
|
|
{ }
|
|
|
|
protected:
|
|
// Write out the data--the actual data must be written out
|
|
// elsewhere.
|
|
void
|
|
do_write(Output_file*)
|
|
{ }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _(this->map_name_)); }
|
|
|
|
private:
|
|
// Name to use in a map file. Maps are a rarely used feature, but
|
|
// the space usage is minor as aren't very many of these objects.
|
|
const char* map_name_;
|
|
};
|
|
|
|
// A place holder for variable sized data written out via some other
|
|
// mechanism.
|
|
|
|
class Output_data_space : public Output_section_data_build
|
|
{
|
|
public:
|
|
explicit Output_data_space(uint64_t addralign, const char* map_name)
|
|
: Output_section_data_build(addralign),
|
|
map_name_(map_name)
|
|
{ }
|
|
|
|
// Set the alignment.
|
|
void
|
|
set_space_alignment(uint64_t align)
|
|
{ this->set_addralign(align); }
|
|
|
|
protected:
|
|
// Write out the data--the actual data must be written out
|
|
// elsewhere.
|
|
void
|
|
do_write(Output_file*)
|
|
{ }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _(this->map_name_)); }
|
|
|
|
private:
|
|
// Name to use in a map file. Maps are a rarely used feature, but
|
|
// the space usage is minor as aren't very many of these objects.
|
|
const char* map_name_;
|
|
};
|
|
|
|
// Fill fixed space with zeroes. This is just like
|
|
// Output_data_fixed_space, except that the map name is known.
|
|
|
|
class Output_data_zero_fill : public Output_section_data
|
|
{
|
|
public:
|
|
Output_data_zero_fill(off_t data_size, uint64_t addralign)
|
|
: Output_section_data(data_size, addralign)
|
|
{ }
|
|
|
|
protected:
|
|
// There is no data to write out.
|
|
void
|
|
do_write(Output_file*)
|
|
{ }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, "** zero fill"); }
|
|
};
|
|
|
|
// A string table which goes into an output section.
|
|
|
|
class Output_data_strtab : public Output_section_data
|
|
{
|
|
public:
|
|
Output_data_strtab(Stringpool* strtab)
|
|
: Output_section_data(1), strtab_(strtab)
|
|
{ }
|
|
|
|
protected:
|
|
// This is called to set the address and file offset. Here we make
|
|
// sure that the Stringpool is finalized.
|
|
void
|
|
set_final_data_size();
|
|
|
|
// Write out the data.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Write the data to a buffer.
|
|
void
|
|
do_write_to_buffer(unsigned char* buffer)
|
|
{ this->strtab_->write_to_buffer(buffer, this->data_size()); }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** string table")); }
|
|
|
|
private:
|
|
Stringpool* strtab_;
|
|
};
|
|
|
|
// This POD class is used to represent a single reloc in the output
|
|
// file. This could be a private class within Output_data_reloc, but
|
|
// the templatization is complex enough that I broke it out into a
|
|
// separate class. The class is templatized on either elfcpp::SHT_REL
|
|
// or elfcpp::SHT_RELA, and also on whether this is a dynamic
|
|
// relocation or an ordinary relocation.
|
|
|
|
// A relocation can be against a global symbol, a local symbol, a
|
|
// local section symbol, an output section, or the undefined symbol at
|
|
// index 0. We represent the latter by using a NULL global symbol.
|
|
|
|
template<int sh_type, bool dynamic, int size, bool big_endian>
|
|
class Output_reloc;
|
|
|
|
template<bool dynamic, int size, bool big_endian>
|
|
class Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>
|
|
{
|
|
public:
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend;
|
|
|
|
// An uninitialized entry. We need this because we want to put
|
|
// instances of this class into an STL container.
|
|
Output_reloc()
|
|
: local_sym_index_(INVALID_CODE)
|
|
{ }
|
|
|
|
// We have a bunch of different constructors. They come in pairs
|
|
// depending on how the address of the relocation is specified. It
|
|
// can either be an offset in an Output_data or an offset in an
|
|
// input section.
|
|
|
|
// A reloc against a global symbol.
|
|
|
|
Output_reloc(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Address address, bool is_relative);
|
|
|
|
Output_reloc(Symbol* gsym, unsigned int type, Relobj* relobj,
|
|
unsigned int shndx, Address address, bool is_relative);
|
|
|
|
// A reloc against a local symbol or local section symbol.
|
|
|
|
Output_reloc(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, Address address, bool is_relative,
|
|
bool is_section_symbol);
|
|
|
|
Output_reloc(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
unsigned int shndx, Address address, bool is_relative,
|
|
bool is_section_symbol);
|
|
|
|
// A reloc against the STT_SECTION symbol of an output section.
|
|
|
|
Output_reloc(Output_section* os, unsigned int type, Output_data* od,
|
|
Address address);
|
|
|
|
Output_reloc(Output_section* os, unsigned int type, Relobj* relobj,
|
|
unsigned int shndx, Address address);
|
|
|
|
// Return TRUE if this is a RELATIVE relocation.
|
|
bool
|
|
is_relative() const
|
|
{ return this->is_relative_; }
|
|
|
|
// Return whether this is against a local section symbol.
|
|
bool
|
|
is_local_section_symbol() const
|
|
{
|
|
return (this->local_sym_index_ != GSYM_CODE
|
|
&& this->local_sym_index_ != SECTION_CODE
|
|
&& this->local_sym_index_ != INVALID_CODE
|
|
&& this->is_section_symbol_);
|
|
}
|
|
|
|
// For a local section symbol, return the offset of the input
|
|
// section within the output section. ADDEND is the addend being
|
|
// applied to the input section.
|
|
section_offset_type
|
|
local_section_offset(Addend addend) const;
|
|
|
|
// Get the value of the symbol referred to by a Rel relocation when
|
|
// we are adding the given ADDEND.
|
|
Address
|
|
symbol_value(Addend addend) const;
|
|
|
|
// Write the reloc entry to an output view.
|
|
void
|
|
write(unsigned char* pov) const;
|
|
|
|
// Write the offset and info fields to Write_rel.
|
|
template<typename Write_rel>
|
|
void write_rel(Write_rel*) const;
|
|
|
|
// This is used when sorting dynamic relocs. Return -1 to sort this
|
|
// reloc before R2, 0 to sort the same as R2, 1 to sort after R2.
|
|
int
|
|
compare(const Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>& r2)
|
|
const;
|
|
|
|
// Return whether this reloc should be sorted before the argument
|
|
// when sorting dynamic relocs.
|
|
bool
|
|
sort_before(const Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>&
|
|
r2) const
|
|
{ return this->compare(r2) < 0; }
|
|
|
|
private:
|
|
// Record that we need a dynamic symbol index.
|
|
void
|
|
set_needs_dynsym_index();
|
|
|
|
// Return the symbol index.
|
|
unsigned int
|
|
get_symbol_index() const;
|
|
|
|
// Return the output address.
|
|
Address
|
|
get_address() const;
|
|
|
|
// Codes for local_sym_index_.
|
|
enum
|
|
{
|
|
// Global symbol.
|
|
GSYM_CODE = -1U,
|
|
// Output section.
|
|
SECTION_CODE = -2U,
|
|
// Invalid uninitialized entry.
|
|
INVALID_CODE = -3U
|
|
};
|
|
|
|
union
|
|
{
|
|
// For a local symbol or local section symbol
|
|
// (this->local_sym_index_ >= 0), the object. We will never
|
|
// generate a relocation against a local symbol in a dynamic
|
|
// object; that doesn't make sense. And our callers will always
|
|
// be templatized, so we use Sized_relobj here.
|
|
Sized_relobj<size, big_endian>* relobj;
|
|
// For a global symbol (this->local_sym_index_ == GSYM_CODE, the
|
|
// symbol. If this is NULL, it indicates a relocation against the
|
|
// undefined 0 symbol.
|
|
Symbol* gsym;
|
|
// For a relocation against an output section
|
|
// (this->local_sym_index_ == SECTION_CODE), the output section.
|
|
Output_section* os;
|
|
} u1_;
|
|
union
|
|
{
|
|
// If this->shndx_ is not INVALID CODE, the object which holds the
|
|
// input section being used to specify the reloc address.
|
|
Relobj* relobj;
|
|
// If this->shndx_ is INVALID_CODE, the output data being used to
|
|
// specify the reloc address. This may be NULL if the reloc
|
|
// address is absolute.
|
|
Output_data* od;
|
|
} u2_;
|
|
// The address offset within the input section or the Output_data.
|
|
Address address_;
|
|
// This is GSYM_CODE for a global symbol, or SECTION_CODE for a
|
|
// relocation against an output section, or INVALID_CODE for an
|
|
// uninitialized value. Otherwise, for a local symbol
|
|
// (this->is_section_symbol_ is false), the local symbol index. For
|
|
// a local section symbol (this->is_section_symbol_ is true), the
|
|
// section index in the input file.
|
|
unsigned int local_sym_index_;
|
|
// The reloc type--a processor specific code.
|
|
unsigned int type_ : 30;
|
|
// True if the relocation is a RELATIVE relocation.
|
|
bool is_relative_ : 1;
|
|
// True if the relocation is against a section symbol.
|
|
bool is_section_symbol_ : 1;
|
|
// If the reloc address is an input section in an object, the
|
|
// section index. This is INVALID_CODE if the reloc address is
|
|
// specified in some other way.
|
|
unsigned int shndx_;
|
|
};
|
|
|
|
// The SHT_RELA version of Output_reloc<>. This is just derived from
|
|
// the SHT_REL version of Output_reloc, but it adds an addend.
|
|
|
|
template<bool dynamic, int size, bool big_endian>
|
|
class Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>
|
|
{
|
|
public:
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend;
|
|
|
|
// An uninitialized entry.
|
|
Output_reloc()
|
|
: rel_()
|
|
{ }
|
|
|
|
// A reloc against a global symbol.
|
|
|
|
Output_reloc(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Address address, Addend addend, bool is_relative)
|
|
: rel_(gsym, type, od, address, is_relative), addend_(addend)
|
|
{ }
|
|
|
|
Output_reloc(Symbol* gsym, unsigned int type, Relobj* relobj,
|
|
unsigned int shndx, Address address, Addend addend,
|
|
bool is_relative)
|
|
: rel_(gsym, type, relobj, shndx, address, is_relative), addend_(addend)
|
|
{ }
|
|
|
|
// A reloc against a local symbol.
|
|
|
|
Output_reloc(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, Address address,
|
|
Addend addend, bool is_relative, bool is_section_symbol)
|
|
: rel_(relobj, local_sym_index, type, od, address, is_relative,
|
|
is_section_symbol),
|
|
addend_(addend)
|
|
{ }
|
|
|
|
Output_reloc(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
unsigned int shndx, Address address,
|
|
Addend addend, bool is_relative, bool is_section_symbol)
|
|
: rel_(relobj, local_sym_index, type, shndx, address, is_relative,
|
|
is_section_symbol),
|
|
addend_(addend)
|
|
{ }
|
|
|
|
// A reloc against the STT_SECTION symbol of an output section.
|
|
|
|
Output_reloc(Output_section* os, unsigned int type, Output_data* od,
|
|
Address address, Addend addend)
|
|
: rel_(os, type, od, address), addend_(addend)
|
|
{ }
|
|
|
|
Output_reloc(Output_section* os, unsigned int type, Relobj* relobj,
|
|
unsigned int shndx, Address address, Addend addend)
|
|
: rel_(os, type, relobj, shndx, address), addend_(addend)
|
|
{ }
|
|
|
|
// Write the reloc entry to an output view.
|
|
void
|
|
write(unsigned char* pov) const;
|
|
|
|
// Return whether this reloc should be sorted before the argument
|
|
// when sorting dynamic relocs.
|
|
bool
|
|
sort_before(const Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>&
|
|
r2) const
|
|
{
|
|
int i = this->rel_.compare(r2.rel_);
|
|
if (i < 0)
|
|
return true;
|
|
else if (i > 0)
|
|
return false;
|
|
else
|
|
return this->addend_ < r2.addend_;
|
|
}
|
|
|
|
private:
|
|
// The basic reloc.
|
|
Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> rel_;
|
|
// The addend.
|
|
Addend addend_;
|
|
};
|
|
|
|
// Output_data_reloc is used to manage a section containing relocs.
|
|
// SH_TYPE is either elfcpp::SHT_REL or elfcpp::SHT_RELA. DYNAMIC
|
|
// indicates whether this is a dynamic relocation or a normal
|
|
// relocation. Output_data_reloc_base is a base class.
|
|
// Output_data_reloc is the real class, which we specialize based on
|
|
// the reloc type.
|
|
|
|
template<int sh_type, bool dynamic, int size, bool big_endian>
|
|
class Output_data_reloc_base : public Output_section_data_build
|
|
{
|
|
public:
|
|
typedef Output_reloc<sh_type, dynamic, size, big_endian> Output_reloc_type;
|
|
typedef typename Output_reloc_type::Address Address;
|
|
static const int reloc_size =
|
|
Reloc_types<sh_type, size, big_endian>::reloc_size;
|
|
|
|
// Construct the section.
|
|
Output_data_reloc_base(bool sort_relocs)
|
|
: Output_section_data_build(Output_data::default_alignment_for_size(size)),
|
|
sort_relocs_(sort_relocs)
|
|
{ }
|
|
|
|
protected:
|
|
// Write out the data.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Set the entry size and the link.
|
|
void
|
|
do_adjust_output_section(Output_section *os);
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{
|
|
mapfile->print_output_data(this,
|
|
(dynamic
|
|
? _("** dynamic relocs")
|
|
: _("** relocs")));
|
|
}
|
|
|
|
// Add a relocation entry.
|
|
void
|
|
add(Output_data *od, const Output_reloc_type& reloc)
|
|
{
|
|
this->relocs_.push_back(reloc);
|
|
this->set_current_data_size(this->relocs_.size() * reloc_size);
|
|
od->add_dynamic_reloc();
|
|
}
|
|
|
|
private:
|
|
typedef std::vector<Output_reloc_type> Relocs;
|
|
|
|
// The class used to sort the relocations.
|
|
struct Sort_relocs_comparison
|
|
{
|
|
bool
|
|
operator()(const Output_reloc_type& r1, const Output_reloc_type& r2) const
|
|
{ return r1.sort_before(r2); }
|
|
};
|
|
|
|
// The relocations in this section.
|
|
Relocs relocs_;
|
|
// Whether to sort the relocations when writing them out, to make
|
|
// the dynamic linker more efficient.
|
|
bool sort_relocs_;
|
|
};
|
|
|
|
// The class which callers actually create.
|
|
|
|
template<int sh_type, bool dynamic, int size, bool big_endian>
|
|
class Output_data_reloc;
|
|
|
|
// The SHT_REL version of Output_data_reloc.
|
|
|
|
template<bool dynamic, int size, bool big_endian>
|
|
class Output_data_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>
|
|
: public Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>
|
|
{
|
|
private:
|
|
typedef Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size,
|
|
big_endian> Base;
|
|
|
|
public:
|
|
typedef typename Base::Output_reloc_type Output_reloc_type;
|
|
typedef typename Output_reloc_type::Address Address;
|
|
|
|
Output_data_reloc(bool sr)
|
|
: Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>(sr)
|
|
{ }
|
|
|
|
// Add a reloc against a global symbol.
|
|
|
|
void
|
|
add_global(Symbol* gsym, unsigned int type, Output_data* od, Address address)
|
|
{ this->add(od, Output_reloc_type(gsym, type, od, address, false)); }
|
|
|
|
void
|
|
add_global(Symbol* gsym, unsigned int type, Output_data* od, Relobj* relobj,
|
|
unsigned int shndx, Address address)
|
|
{ this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
|
|
false)); }
|
|
|
|
// These are to simplify the Copy_relocs class.
|
|
|
|
void
|
|
add_global(Symbol* gsym, unsigned int type, Output_data* od, Address address,
|
|
Address addend)
|
|
{
|
|
gold_assert(addend == 0);
|
|
this->add_global(gsym, type, od, address);
|
|
}
|
|
|
|
void
|
|
add_global(Symbol* gsym, unsigned int type, Output_data* od, Relobj* relobj,
|
|
unsigned int shndx, Address address, Address addend)
|
|
{
|
|
gold_assert(addend == 0);
|
|
this->add_global(gsym, type, od, relobj, shndx, address);
|
|
}
|
|
|
|
// Add a RELATIVE reloc against a global symbol. The final relocation
|
|
// will not reference the symbol.
|
|
|
|
void
|
|
add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Address address)
|
|
{ this->add(od, Output_reloc_type(gsym, type, od, address, true)); }
|
|
|
|
void
|
|
add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Relobj* relobj, unsigned int shndx, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
|
|
true));
|
|
}
|
|
|
|
// Add a reloc against a local symbol.
|
|
|
|
void
|
|
add_local(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
|
|
address, false, false));
|
|
}
|
|
|
|
void
|
|
add_local(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, unsigned int shndx, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
|
|
address, false, false));
|
|
}
|
|
|
|
// Add a RELATIVE reloc against a local symbol.
|
|
|
|
void
|
|
add_local_relative(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
|
|
address, true, false));
|
|
}
|
|
|
|
void
|
|
add_local_relative(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, unsigned int shndx, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
|
|
address, true, false));
|
|
}
|
|
|
|
// Add a reloc against a local section symbol. This will be
|
|
// converted into a reloc against the STT_SECTION symbol of the
|
|
// output section.
|
|
|
|
void
|
|
add_local_section(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int input_shndx, unsigned int type,
|
|
Output_data* od, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, input_shndx, type, od,
|
|
address, false, true));
|
|
}
|
|
|
|
void
|
|
add_local_section(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int input_shndx, unsigned int type,
|
|
Output_data* od, unsigned int shndx, Address address)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, input_shndx, type, shndx,
|
|
address, false, true));
|
|
}
|
|
|
|
// A reloc against the STT_SECTION symbol of an output section.
|
|
// OS is the Output_section that the relocation refers to; OD is
|
|
// the Output_data object being relocated.
|
|
|
|
void
|
|
add_output_section(Output_section* os, unsigned int type,
|
|
Output_data* od, Address address)
|
|
{ this->add(od, Output_reloc_type(os, type, od, address)); }
|
|
|
|
void
|
|
add_output_section(Output_section* os, unsigned int type, Output_data* od,
|
|
Relobj* relobj, unsigned int shndx, Address address)
|
|
{ this->add(od, Output_reloc_type(os, type, relobj, shndx, address)); }
|
|
};
|
|
|
|
// The SHT_RELA version of Output_data_reloc.
|
|
|
|
template<bool dynamic, int size, bool big_endian>
|
|
class Output_data_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>
|
|
: public Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>
|
|
{
|
|
private:
|
|
typedef Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size,
|
|
big_endian> Base;
|
|
|
|
public:
|
|
typedef typename Base::Output_reloc_type Output_reloc_type;
|
|
typedef typename Output_reloc_type::Address Address;
|
|
typedef typename Output_reloc_type::Addend Addend;
|
|
|
|
Output_data_reloc(bool sr)
|
|
: Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>(sr)
|
|
{ }
|
|
|
|
// Add a reloc against a global symbol.
|
|
|
|
void
|
|
add_global(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Address address, Addend addend)
|
|
{ this->add(od, Output_reloc_type(gsym, type, od, address, addend,
|
|
false)); }
|
|
|
|
void
|
|
add_global(Symbol* gsym, unsigned int type, Output_data* od, Relobj* relobj,
|
|
unsigned int shndx, Address address,
|
|
Addend addend)
|
|
{ this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
|
|
addend, false)); }
|
|
|
|
// Add a RELATIVE reloc against a global symbol. The final output
|
|
// relocation will not reference the symbol, but we must keep the symbol
|
|
// information long enough to set the addend of the relocation correctly
|
|
// when it is written.
|
|
|
|
void
|
|
add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Address address, Addend addend)
|
|
{ this->add(od, Output_reloc_type(gsym, type, od, address, addend, true)); }
|
|
|
|
void
|
|
add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
|
|
Relobj* relobj, unsigned int shndx, Address address,
|
|
Addend addend)
|
|
{ this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
|
|
addend, true)); }
|
|
|
|
// Add a reloc against a local symbol.
|
|
|
|
void
|
|
add_local(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, Address address, Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
|
|
addend, false, false));
|
|
}
|
|
|
|
void
|
|
add_local(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, unsigned int shndx, Address address,
|
|
Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
|
|
address, addend, false, false));
|
|
}
|
|
|
|
// Add a RELATIVE reloc against a local symbol.
|
|
|
|
void
|
|
add_local_relative(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, Address address, Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
|
|
addend, true, false));
|
|
}
|
|
|
|
void
|
|
add_local_relative(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int local_sym_index, unsigned int type,
|
|
Output_data* od, unsigned int shndx, Address address,
|
|
Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
|
|
address, addend, true, false));
|
|
}
|
|
|
|
// Add a reloc against a local section symbol. This will be
|
|
// converted into a reloc against the STT_SECTION symbol of the
|
|
// output section.
|
|
|
|
void
|
|
add_local_section(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int input_shndx, unsigned int type,
|
|
Output_data* od, Address address, Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, input_shndx, type, od, address,
|
|
addend, false, true));
|
|
}
|
|
|
|
void
|
|
add_local_section(Sized_relobj<size, big_endian>* relobj,
|
|
unsigned int input_shndx, unsigned int type,
|
|
Output_data* od, unsigned int shndx, Address address,
|
|
Addend addend)
|
|
{
|
|
this->add(od, Output_reloc_type(relobj, input_shndx, type, shndx,
|
|
address, addend, false, true));
|
|
}
|
|
|
|
// A reloc against the STT_SECTION symbol of an output section.
|
|
|
|
void
|
|
add_output_section(Output_section* os, unsigned int type, Output_data* od,
|
|
Address address, Addend addend)
|
|
{ this->add(os, Output_reloc_type(os, type, od, address, addend)); }
|
|
|
|
void
|
|
add_output_section(Output_section* os, unsigned int type, Relobj* relobj,
|
|
unsigned int shndx, Address address, Addend addend)
|
|
{ this->add(os, Output_reloc_type(os, type, relobj, shndx, address,
|
|
addend)); }
|
|
};
|
|
|
|
// Output_relocatable_relocs represents a relocation section in a
|
|
// relocatable link. The actual data is written out in the target
|
|
// hook relocate_for_relocatable. This just saves space for it.
|
|
|
|
template<int sh_type, int size, bool big_endian>
|
|
class Output_relocatable_relocs : public Output_section_data
|
|
{
|
|
public:
|
|
Output_relocatable_relocs(Relocatable_relocs* rr)
|
|
: Output_section_data(Output_data::default_alignment_for_size(size)),
|
|
rr_(rr)
|
|
{ }
|
|
|
|
void
|
|
set_final_data_size();
|
|
|
|
// Write out the data. There is nothing to do here.
|
|
void
|
|
do_write(Output_file*)
|
|
{ }
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** relocs")); }
|
|
|
|
private:
|
|
// The relocs associated with this input section.
|
|
Relocatable_relocs* rr_;
|
|
};
|
|
|
|
// Handle a GROUP section.
|
|
|
|
template<int size, bool big_endian>
|
|
class Output_data_group : public Output_section_data
|
|
{
|
|
public:
|
|
// The constructor clears *INPUT_SHNDXES.
|
|
Output_data_group(Sized_relobj<size, big_endian>* relobj,
|
|
section_size_type entry_count,
|
|
elfcpp::Elf_Word flags,
|
|
std::vector<unsigned int>* input_shndxes);
|
|
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** group")); }
|
|
|
|
private:
|
|
// The input object.
|
|
Sized_relobj<size, big_endian>* relobj_;
|
|
// The group flag word.
|
|
elfcpp::Elf_Word flags_;
|
|
// The section indexes of the input sections in this group.
|
|
std::vector<unsigned int> input_shndxes_;
|
|
};
|
|
|
|
// Output_data_got is used to manage a GOT. Each entry in the GOT is
|
|
// for one symbol--either a global symbol or a local symbol in an
|
|
// object. The target specific code adds entries to the GOT as
|
|
// needed.
|
|
|
|
template<int size, bool big_endian>
|
|
class Output_data_got : public Output_section_data_build
|
|
{
|
|
public:
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype;
|
|
typedef Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian> Rel_dyn;
|
|
typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Rela_dyn;
|
|
|
|
Output_data_got()
|
|
: Output_section_data_build(Output_data::default_alignment_for_size(size)),
|
|
entries_()
|
|
{ }
|
|
|
|
// Add an entry for a global symbol to the GOT. Return true if this
|
|
// is a new GOT entry, false if the symbol was already in the GOT.
|
|
bool
|
|
add_global(Symbol* gsym, unsigned int got_type);
|
|
|
|
// Add an entry for a global symbol to the GOT, and add a dynamic
|
|
// relocation of type R_TYPE for the GOT entry.
|
|
void
|
|
add_global_with_rel(Symbol* gsym, unsigned int got_type,
|
|
Rel_dyn* rel_dyn, unsigned int r_type);
|
|
|
|
void
|
|
add_global_with_rela(Symbol* gsym, unsigned int got_type,
|
|
Rela_dyn* rela_dyn, unsigned int r_type);
|
|
|
|
// Add a pair of entries for a global symbol to the GOT, and add
|
|
// dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
|
|
void
|
|
add_global_pair_with_rel(Symbol* gsym, unsigned int got_type,
|
|
Rel_dyn* rel_dyn, unsigned int r_type_1,
|
|
unsigned int r_type_2);
|
|
|
|
void
|
|
add_global_pair_with_rela(Symbol* gsym, unsigned int got_type,
|
|
Rela_dyn* rela_dyn, unsigned int r_type_1,
|
|
unsigned int r_type_2);
|
|
|
|
// Add an entry for a local symbol to the GOT. This returns true if
|
|
// this is a new GOT entry, false if the symbol already has a GOT
|
|
// entry.
|
|
bool
|
|
add_local(Sized_relobj<size, big_endian>* object, unsigned int sym_index,
|
|
unsigned int got_type);
|
|
|
|
// Add an entry for a local symbol to the GOT, and add a dynamic
|
|
// relocation of type R_TYPE for the GOT entry.
|
|
void
|
|
add_local_with_rel(Sized_relobj<size, big_endian>* object,
|
|
unsigned int sym_index, unsigned int got_type,
|
|
Rel_dyn* rel_dyn, unsigned int r_type);
|
|
|
|
void
|
|
add_local_with_rela(Sized_relobj<size, big_endian>* object,
|
|
unsigned int sym_index, unsigned int got_type,
|
|
Rela_dyn* rela_dyn, unsigned int r_type);
|
|
|
|
// Add a pair of entries for a local symbol to the GOT, and add
|
|
// dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
|
|
void
|
|
add_local_pair_with_rel(Sized_relobj<size, big_endian>* object,
|
|
unsigned int sym_index, unsigned int shndx,
|
|
unsigned int got_type, Rel_dyn* rel_dyn,
|
|
unsigned int r_type_1, unsigned int r_type_2);
|
|
|
|
void
|
|
add_local_pair_with_rela(Sized_relobj<size, big_endian>* object,
|
|
unsigned int sym_index, unsigned int shndx,
|
|
unsigned int got_type, Rela_dyn* rela_dyn,
|
|
unsigned int r_type_1, unsigned int r_type_2);
|
|
|
|
// Add a constant to the GOT. This returns the offset of the new
|
|
// entry from the start of the GOT.
|
|
unsigned int
|
|
add_constant(Valtype constant)
|
|
{
|
|
this->entries_.push_back(Got_entry(constant));
|
|
this->set_got_size();
|
|
return this->last_got_offset();
|
|
}
|
|
|
|
protected:
|
|
// Write out the GOT table.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** GOT")); }
|
|
|
|
private:
|
|
// This POD class holds a single GOT entry.
|
|
class Got_entry
|
|
{
|
|
public:
|
|
// Create a zero entry.
|
|
Got_entry()
|
|
: local_sym_index_(CONSTANT_CODE)
|
|
{ this->u_.constant = 0; }
|
|
|
|
// Create a global symbol entry.
|
|
explicit Got_entry(Symbol* gsym)
|
|
: local_sym_index_(GSYM_CODE)
|
|
{ this->u_.gsym = gsym; }
|
|
|
|
// Create a local symbol entry.
|
|
Got_entry(Sized_relobj<size, big_endian>* object,
|
|
unsigned int local_sym_index)
|
|
: local_sym_index_(local_sym_index)
|
|
{
|
|
gold_assert(local_sym_index != GSYM_CODE
|
|
&& local_sym_index != CONSTANT_CODE);
|
|
this->u_.object = object;
|
|
}
|
|
|
|
// Create a constant entry. The constant is a host value--it will
|
|
// be swapped, if necessary, when it is written out.
|
|
explicit Got_entry(Valtype constant)
|
|
: local_sym_index_(CONSTANT_CODE)
|
|
{ this->u_.constant = constant; }
|
|
|
|
// Write the GOT entry to an output view.
|
|
void
|
|
write(unsigned char* pov) const;
|
|
|
|
private:
|
|
enum
|
|
{
|
|
GSYM_CODE = -1U,
|
|
CONSTANT_CODE = -2U
|
|
};
|
|
|
|
union
|
|
{
|
|
// For a local symbol, the object.
|
|
Sized_relobj<size, big_endian>* object;
|
|
// For a global symbol, the symbol.
|
|
Symbol* gsym;
|
|
// For a constant, the constant.
|
|
Valtype constant;
|
|
} u_;
|
|
// For a local symbol, the local symbol index. This is GSYM_CODE
|
|
// for a global symbol, or CONSTANT_CODE for a constant.
|
|
unsigned int local_sym_index_;
|
|
};
|
|
|
|
typedef std::vector<Got_entry> Got_entries;
|
|
|
|
// Return the offset into the GOT of GOT entry I.
|
|
unsigned int
|
|
got_offset(unsigned int i) const
|
|
{ return i * (size / 8); }
|
|
|
|
// Return the offset into the GOT of the last entry added.
|
|
unsigned int
|
|
last_got_offset() const
|
|
{ return this->got_offset(this->entries_.size() - 1); }
|
|
|
|
// Set the size of the section.
|
|
void
|
|
set_got_size()
|
|
{ this->set_current_data_size(this->got_offset(this->entries_.size())); }
|
|
|
|
// The list of GOT entries.
|
|
Got_entries entries_;
|
|
};
|
|
|
|
// Output_data_dynamic is used to hold the data in SHT_DYNAMIC
|
|
// section.
|
|
|
|
class Output_data_dynamic : public Output_section_data
|
|
{
|
|
public:
|
|
Output_data_dynamic(Stringpool* pool)
|
|
: Output_section_data(Output_data::default_alignment()),
|
|
entries_(), pool_(pool)
|
|
{ }
|
|
|
|
// Add a new dynamic entry with a fixed numeric value.
|
|
void
|
|
add_constant(elfcpp::DT tag, unsigned int val)
|
|
{ this->add_entry(Dynamic_entry(tag, val)); }
|
|
|
|
// Add a new dynamic entry with the address of output data.
|
|
void
|
|
add_section_address(elfcpp::DT tag, const Output_data* od)
|
|
{ this->add_entry(Dynamic_entry(tag, od, false)); }
|
|
|
|
// Add a new dynamic entry with the address of output data
|
|
// plus a constant offset.
|
|
void
|
|
add_section_plus_offset(elfcpp::DT tag, const Output_data* od,
|
|
unsigned int offset)
|
|
{ this->add_entry(Dynamic_entry(tag, od, offset)); }
|
|
|
|
// Add a new dynamic entry with the size of output data.
|
|
void
|
|
add_section_size(elfcpp::DT tag, const Output_data* od)
|
|
{ this->add_entry(Dynamic_entry(tag, od, true)); }
|
|
|
|
// Add a new dynamic entry with the address of a symbol.
|
|
void
|
|
add_symbol(elfcpp::DT tag, const Symbol* sym)
|
|
{ this->add_entry(Dynamic_entry(tag, sym)); }
|
|
|
|
// Add a new dynamic entry with a string.
|
|
void
|
|
add_string(elfcpp::DT tag, const char* str)
|
|
{ this->add_entry(Dynamic_entry(tag, this->pool_->add(str, true, NULL))); }
|
|
|
|
void
|
|
add_string(elfcpp::DT tag, const std::string& str)
|
|
{ this->add_string(tag, str.c_str()); }
|
|
|
|
protected:
|
|
// Adjust the output section to set the entry size.
|
|
void
|
|
do_adjust_output_section(Output_section*);
|
|
|
|
// Set the final data size.
|
|
void
|
|
set_final_data_size();
|
|
|
|
// Write out the dynamic entries.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** dynamic")); }
|
|
|
|
private:
|
|
// This POD class holds a single dynamic entry.
|
|
class Dynamic_entry
|
|
{
|
|
public:
|
|
// Create an entry with a fixed numeric value.
|
|
Dynamic_entry(elfcpp::DT tag, unsigned int val)
|
|
: tag_(tag), offset_(DYNAMIC_NUMBER)
|
|
{ this->u_.val = val; }
|
|
|
|
// Create an entry with the size or address of a section.
|
|
Dynamic_entry(elfcpp::DT tag, const Output_data* od, bool section_size)
|
|
: tag_(tag),
|
|
offset_(section_size
|
|
? DYNAMIC_SECTION_SIZE
|
|
: DYNAMIC_SECTION_ADDRESS)
|
|
{ this->u_.od = od; }
|
|
|
|
// Create an entry with the address of a section plus a constant offset.
|
|
Dynamic_entry(elfcpp::DT tag, const Output_data* od, unsigned int offset)
|
|
: tag_(tag),
|
|
offset_(offset)
|
|
{ this->u_.od = od; }
|
|
|
|
// Create an entry with the address of a symbol.
|
|
Dynamic_entry(elfcpp::DT tag, const Symbol* sym)
|
|
: tag_(tag), offset_(DYNAMIC_SYMBOL)
|
|
{ this->u_.sym = sym; }
|
|
|
|
// Create an entry with a string.
|
|
Dynamic_entry(elfcpp::DT tag, const char* str)
|
|
: tag_(tag), offset_(DYNAMIC_STRING)
|
|
{ this->u_.str = str; }
|
|
|
|
// Write the dynamic entry to an output view.
|
|
template<int size, bool big_endian>
|
|
void
|
|
write(unsigned char* pov, const Stringpool*) const;
|
|
|
|
private:
|
|
// Classification is encoded in the OFFSET field.
|
|
enum Classification
|
|
{
|
|
// Section address.
|
|
DYNAMIC_SECTION_ADDRESS = 0,
|
|
// Number.
|
|
DYNAMIC_NUMBER = -1U,
|
|
// Section size.
|
|
DYNAMIC_SECTION_SIZE = -2U,
|
|
// Symbol adress.
|
|
DYNAMIC_SYMBOL = -3U,
|
|
// String.
|
|
DYNAMIC_STRING = -4U
|
|
// Any other value indicates a section address plus OFFSET.
|
|
};
|
|
|
|
union
|
|
{
|
|
// For DYNAMIC_NUMBER.
|
|
unsigned int val;
|
|
// For DYNAMIC_SECTION_SIZE and section address plus OFFSET.
|
|
const Output_data* od;
|
|
// For DYNAMIC_SYMBOL.
|
|
const Symbol* sym;
|
|
// For DYNAMIC_STRING.
|
|
const char* str;
|
|
} u_;
|
|
// The dynamic tag.
|
|
elfcpp::DT tag_;
|
|
// The type of entry (Classification) or offset within a section.
|
|
unsigned int offset_;
|
|
};
|
|
|
|
// Add an entry to the list.
|
|
void
|
|
add_entry(const Dynamic_entry& entry)
|
|
{ this->entries_.push_back(entry); }
|
|
|
|
// Sized version of write function.
|
|
template<int size, bool big_endian>
|
|
void
|
|
sized_write(Output_file* of);
|
|
|
|
// The type of the list of entries.
|
|
typedef std::vector<Dynamic_entry> Dynamic_entries;
|
|
|
|
// The entries.
|
|
Dynamic_entries entries_;
|
|
// The pool used for strings.
|
|
Stringpool* pool_;
|
|
};
|
|
|
|
// Output_symtab_xindex is used to handle SHT_SYMTAB_SHNDX sections,
|
|
// which may be required if the object file has more than
|
|
// SHN_LORESERVE sections.
|
|
|
|
class Output_symtab_xindex : public Output_section_data
|
|
{
|
|
public:
|
|
Output_symtab_xindex(size_t symcount)
|
|
: Output_section_data(symcount * 4, 4),
|
|
entries_()
|
|
{ }
|
|
|
|
// Add an entry: symbol number SYMNDX has section SHNDX.
|
|
void
|
|
add(unsigned int symndx, unsigned int shndx)
|
|
{ this->entries_.push_back(std::make_pair(symndx, shndx)); }
|
|
|
|
protected:
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** symtab xindex")); }
|
|
|
|
private:
|
|
template<bool big_endian>
|
|
void
|
|
endian_do_write(unsigned char*);
|
|
|
|
// It is likely that most symbols will not require entries. Rather
|
|
// than keep a vector for all symbols, we keep pairs of symbol index
|
|
// and section index.
|
|
typedef std::vector<std::pair<unsigned int, unsigned int> > Xindex_entries;
|
|
|
|
// The entries we need.
|
|
Xindex_entries entries_;
|
|
};
|
|
|
|
// An output section. We don't expect to have too many output
|
|
// sections, so we don't bother to do a template on the size.
|
|
|
|
class Output_section : public Output_data
|
|
{
|
|
public:
|
|
// Create an output section, giving the name, type, and flags.
|
|
Output_section(const char* name, elfcpp::Elf_Word, elfcpp::Elf_Xword);
|
|
virtual ~Output_section();
|
|
|
|
// Add a new input section SHNDX, named NAME, with header SHDR, from
|
|
// object OBJECT. RELOC_SHNDX is the index of a relocation section
|
|
// which applies to this section, or 0 if none, or -1U if more than
|
|
// one. HAVE_SECTIONS_SCRIPT is true if we have a SECTIONS clause
|
|
// in a linker script; in that case we need to keep track of input
|
|
// sections associated with an output section. Return the offset
|
|
// within the output section.
|
|
template<int size, bool big_endian>
|
|
off_t
|
|
add_input_section(Sized_relobj<size, big_endian>* object, unsigned int shndx,
|
|
const char *name,
|
|
const elfcpp::Shdr<size, big_endian>& shdr,
|
|
unsigned int reloc_shndx, bool have_sections_script);
|
|
|
|
// Add generated data POSD to this output section.
|
|
void
|
|
add_output_section_data(Output_section_data* posd);
|
|
|
|
// Return the section name.
|
|
const char*
|
|
name() const
|
|
{ return this->name_; }
|
|
|
|
// Return the section type.
|
|
elfcpp::Elf_Word
|
|
type() const
|
|
{ return this->type_; }
|
|
|
|
// Return the section flags.
|
|
elfcpp::Elf_Xword
|
|
flags() const
|
|
{ return this->flags_; }
|
|
|
|
// Set the section flags. This may only be used with the Layout
|
|
// code when it is prepared to move the section to a different
|
|
// segment.
|
|
void
|
|
set_flags(elfcpp::Elf_Xword flags)
|
|
{ this->flags_ = flags; }
|
|
|
|
// Update the output section flags based on input section flags.
|
|
void
|
|
update_flags_for_input_section(elfcpp::Elf_Xword flags)
|
|
{
|
|
this->flags_ |= (flags
|
|
& (elfcpp::SHF_WRITE
|
|
| elfcpp::SHF_ALLOC
|
|
| elfcpp::SHF_EXECINSTR));
|
|
}
|
|
|
|
// Return the entsize field.
|
|
uint64_t
|
|
entsize() const
|
|
{ return this->entsize_; }
|
|
|
|
// Set the entsize field.
|
|
void
|
|
set_entsize(uint64_t v);
|
|
|
|
// Set the load address.
|
|
void
|
|
set_load_address(uint64_t load_address)
|
|
{
|
|
this->load_address_ = load_address;
|
|
this->has_load_address_ = true;
|
|
}
|
|
|
|
// Set the link field to the output section index of a section.
|
|
void
|
|
set_link_section(const Output_data* od)
|
|
{
|
|
gold_assert(this->link_ == 0
|
|
&& !this->should_link_to_symtab_
|
|
&& !this->should_link_to_dynsym_);
|
|
this->link_section_ = od;
|
|
}
|
|
|
|
// Set the link field to a constant.
|
|
void
|
|
set_link(unsigned int v)
|
|
{
|
|
gold_assert(this->link_section_ == NULL
|
|
&& !this->should_link_to_symtab_
|
|
&& !this->should_link_to_dynsym_);
|
|
this->link_ = v;
|
|
}
|
|
|
|
// Record that this section should link to the normal symbol table.
|
|
void
|
|
set_should_link_to_symtab()
|
|
{
|
|
gold_assert(this->link_section_ == NULL
|
|
&& this->link_ == 0
|
|
&& !this->should_link_to_dynsym_);
|
|
this->should_link_to_symtab_ = true;
|
|
}
|
|
|
|
// Record that this section should link to the dynamic symbol table.
|
|
void
|
|
set_should_link_to_dynsym()
|
|
{
|
|
gold_assert(this->link_section_ == NULL
|
|
&& this->link_ == 0
|
|
&& !this->should_link_to_symtab_);
|
|
this->should_link_to_dynsym_ = true;
|
|
}
|
|
|
|
// Return the info field.
|
|
unsigned int
|
|
info() const
|
|
{
|
|
gold_assert(this->info_section_ == NULL
|
|
&& this->info_symndx_ == NULL);
|
|
return this->info_;
|
|
}
|
|
|
|
// Set the info field to the output section index of a section.
|
|
void
|
|
set_info_section(const Output_section* os)
|
|
{
|
|
gold_assert((this->info_section_ == NULL
|
|
|| (this->info_section_ == os
|
|
&& this->info_uses_section_index_))
|
|
&& this->info_symndx_ == NULL
|
|
&& this->info_ == 0);
|
|
this->info_section_ = os;
|
|
this->info_uses_section_index_= true;
|
|
}
|
|
|
|
// Set the info field to the symbol table index of a symbol.
|
|
void
|
|
set_info_symndx(const Symbol* sym)
|
|
{
|
|
gold_assert(this->info_section_ == NULL
|
|
&& (this->info_symndx_ == NULL
|
|
|| this->info_symndx_ == sym)
|
|
&& this->info_ == 0);
|
|
this->info_symndx_ = sym;
|
|
}
|
|
|
|
// Set the info field to the symbol table index of a section symbol.
|
|
void
|
|
set_info_section_symndx(const Output_section* os)
|
|
{
|
|
gold_assert((this->info_section_ == NULL
|
|
|| (this->info_section_ == os
|
|
&& !this->info_uses_section_index_))
|
|
&& this->info_symndx_ == NULL
|
|
&& this->info_ == 0);
|
|
this->info_section_ = os;
|
|
this->info_uses_section_index_ = false;
|
|
}
|
|
|
|
// Set the info field to a constant.
|
|
void
|
|
set_info(unsigned int v)
|
|
{
|
|
gold_assert(this->info_section_ == NULL
|
|
&& this->info_symndx_ == NULL
|
|
&& (this->info_ == 0
|
|
|| this->info_ == v));
|
|
this->info_ = v;
|
|
}
|
|
|
|
// Set the addralign field.
|
|
void
|
|
set_addralign(uint64_t v)
|
|
{ this->addralign_ = v; }
|
|
|
|
// Whether the output section index has been set.
|
|
bool
|
|
has_out_shndx() const
|
|
{ return this->out_shndx_ != -1U; }
|
|
|
|
// Indicate that we need a symtab index.
|
|
void
|
|
set_needs_symtab_index()
|
|
{ this->needs_symtab_index_ = true; }
|
|
|
|
// Return whether we need a symtab index.
|
|
bool
|
|
needs_symtab_index() const
|
|
{ return this->needs_symtab_index_; }
|
|
|
|
// Get the symtab index.
|
|
unsigned int
|
|
symtab_index() const
|
|
{
|
|
gold_assert(this->symtab_index_ != 0);
|
|
return this->symtab_index_;
|
|
}
|
|
|
|
// Set the symtab index.
|
|
void
|
|
set_symtab_index(unsigned int index)
|
|
{
|
|
gold_assert(index != 0);
|
|
this->symtab_index_ = index;
|
|
}
|
|
|
|
// Indicate that we need a dynsym index.
|
|
void
|
|
set_needs_dynsym_index()
|
|
{ this->needs_dynsym_index_ = true; }
|
|
|
|
// Return whether we need a dynsym index.
|
|
bool
|
|
needs_dynsym_index() const
|
|
{ return this->needs_dynsym_index_; }
|
|
|
|
// Get the dynsym index.
|
|
unsigned int
|
|
dynsym_index() const
|
|
{
|
|
gold_assert(this->dynsym_index_ != 0);
|
|
return this->dynsym_index_;
|
|
}
|
|
|
|
// Set the dynsym index.
|
|
void
|
|
set_dynsym_index(unsigned int index)
|
|
{
|
|
gold_assert(index != 0);
|
|
this->dynsym_index_ = index;
|
|
}
|
|
|
|
// Return whether the input sections sections attachd to this output
|
|
// section may require sorting. This is used to handle constructor
|
|
// priorities compatibly with GNU ld.
|
|
bool
|
|
may_sort_attached_input_sections() const
|
|
{ return this->may_sort_attached_input_sections_; }
|
|
|
|
// Record that the input sections attached to this output section
|
|
// may require sorting.
|
|
void
|
|
set_may_sort_attached_input_sections()
|
|
{ this->may_sort_attached_input_sections_ = true; }
|
|
|
|
// Return whether the input sections attached to this output section
|
|
// require sorting. This is used to handle constructor priorities
|
|
// compatibly with GNU ld.
|
|
bool
|
|
must_sort_attached_input_sections() const
|
|
{ return this->must_sort_attached_input_sections_; }
|
|
|
|
// Record that the input sections attached to this output section
|
|
// require sorting.
|
|
void
|
|
set_must_sort_attached_input_sections()
|
|
{ this->must_sort_attached_input_sections_ = true; }
|
|
|
|
// Return whether this section holds relro data--data which has
|
|
// dynamic relocations but which may be marked read-only after the
|
|
// dynamic relocations have been completed.
|
|
bool
|
|
is_relro() const
|
|
{ return this->is_relro_; }
|
|
|
|
// Record that this section holds relro data.
|
|
void
|
|
set_is_relro()
|
|
{ this->is_relro_ = true; }
|
|
|
|
// True if this section holds relro local data--relro data for which
|
|
// the dynamic relocations are all RELATIVE relocations.
|
|
bool
|
|
is_relro_local() const
|
|
{ return this->is_relro_local_; }
|
|
|
|
// Record that this section holds relro local data.
|
|
void
|
|
set_is_relro_local()
|
|
{ this->is_relro_local_ = true; }
|
|
|
|
// Return whether this section should be written after all the input
|
|
// sections are complete.
|
|
bool
|
|
after_input_sections() const
|
|
{ return this->after_input_sections_; }
|
|
|
|
// Record that this section should be written after all the input
|
|
// sections are complete.
|
|
void
|
|
set_after_input_sections()
|
|
{ this->after_input_sections_ = true; }
|
|
|
|
// Return whether this section requires postprocessing after all
|
|
// relocations have been applied.
|
|
bool
|
|
requires_postprocessing() const
|
|
{ return this->requires_postprocessing_; }
|
|
|
|
// If a section requires postprocessing, return the buffer to use.
|
|
unsigned char*
|
|
postprocessing_buffer() const
|
|
{
|
|
gold_assert(this->postprocessing_buffer_ != NULL);
|
|
return this->postprocessing_buffer_;
|
|
}
|
|
|
|
// If a section requires postprocessing, create the buffer to use.
|
|
void
|
|
create_postprocessing_buffer();
|
|
|
|
// If a section requires postprocessing, this is the size of the
|
|
// buffer to which relocations should be applied.
|
|
off_t
|
|
postprocessing_buffer_size() const
|
|
{ return this->current_data_size_for_child(); }
|
|
|
|
// Modify the section name. This is only permitted for an
|
|
// unallocated section, and only before the size has been finalized.
|
|
// Otherwise the name will not get into Layout::namepool_.
|
|
void
|
|
set_name(const char* newname)
|
|
{
|
|
gold_assert((this->flags_ & elfcpp::SHF_ALLOC) == 0);
|
|
gold_assert(!this->is_data_size_valid());
|
|
this->name_ = newname;
|
|
}
|
|
|
|
// Return whether the offset OFFSET in the input section SHNDX in
|
|
// object OBJECT is being included in the link.
|
|
bool
|
|
is_input_address_mapped(const Relobj* object, unsigned int shndx,
|
|
off_t offset) const;
|
|
|
|
// Return the offset within the output section of OFFSET relative to
|
|
// the start of input section SHNDX in object OBJECT.
|
|
section_offset_type
|
|
output_offset(const Relobj* object, unsigned int shndx,
|
|
section_offset_type offset) const;
|
|
|
|
// Return the output virtual address of OFFSET relative to the start
|
|
// of input section SHNDX in object OBJECT.
|
|
uint64_t
|
|
output_address(const Relobj* object, unsigned int shndx,
|
|
off_t offset) const;
|
|
|
|
// Return the output address of the start of the merged section for
|
|
// input section SHNDX in object OBJECT. This is not necessarily
|
|
// the offset corresponding to input offset 0 in the section, since
|
|
// the section may be mapped arbitrarily.
|
|
uint64_t
|
|
starting_output_address(const Relobj* object, unsigned int shndx) const;
|
|
|
|
// Record that this output section was found in the SECTIONS clause
|
|
// of a linker script.
|
|
void
|
|
set_found_in_sections_clause()
|
|
{ this->found_in_sections_clause_ = true; }
|
|
|
|
// Return whether this output section was found in the SECTIONS
|
|
// clause of a linker script.
|
|
bool
|
|
found_in_sections_clause() const
|
|
{ return this->found_in_sections_clause_; }
|
|
|
|
// Write the section header into *OPHDR.
|
|
template<int size, bool big_endian>
|
|
void
|
|
write_header(const Layout*, const Stringpool*,
|
|
elfcpp::Shdr_write<size, big_endian>*) const;
|
|
|
|
// The next few calls are for linker script support.
|
|
|
|
// Store the list of input sections for this Output_section into the
|
|
// list passed in. This removes the input sections, leaving only
|
|
// any Output_section_data elements. This returns the size of those
|
|
// Output_section_data elements. ADDRESS is the address of this
|
|
// output section. FILL is the fill value to use, in case there are
|
|
// any spaces between the remaining Output_section_data elements.
|
|
uint64_t
|
|
get_input_sections(uint64_t address, const std::string& fill,
|
|
std::list<std::pair<Relobj*, unsigned int > >*);
|
|
|
|
// Add an input section from a script.
|
|
void
|
|
add_input_section_for_script(Relobj* object, unsigned int shndx,
|
|
off_t data_size, uint64_t addralign);
|
|
|
|
// Set the current size of the output section.
|
|
void
|
|
set_current_data_size(off_t size)
|
|
{ this->set_current_data_size_for_child(size); }
|
|
|
|
// Get the current size of the output section.
|
|
off_t
|
|
current_data_size() const
|
|
{ return this->current_data_size_for_child(); }
|
|
|
|
// End of linker script support.
|
|
|
|
// Print merge statistics to stderr.
|
|
void
|
|
print_merge_stats();
|
|
|
|
protected:
|
|
// Return the output section--i.e., the object itself.
|
|
Output_section*
|
|
do_output_section()
|
|
{ return this; }
|
|
|
|
// Return the section index in the output file.
|
|
unsigned int
|
|
do_out_shndx() const
|
|
{
|
|
gold_assert(this->out_shndx_ != -1U);
|
|
return this->out_shndx_;
|
|
}
|
|
|
|
// Set the output section index.
|
|
void
|
|
do_set_out_shndx(unsigned int shndx)
|
|
{
|
|
gold_assert(this->out_shndx_ == -1U || this->out_shndx_ == shndx);
|
|
this->out_shndx_ = shndx;
|
|
}
|
|
|
|
// Set the final data size of the Output_section. For a typical
|
|
// Output_section, there is nothing to do, but if there are any
|
|
// Output_section_data objects we need to set their final addresses
|
|
// here.
|
|
virtual void
|
|
set_final_data_size();
|
|
|
|
// Reset the address and file offset.
|
|
void
|
|
do_reset_address_and_file_offset();
|
|
|
|
// Write the data to the file. For a typical Output_section, this
|
|
// does nothing: the data is written out by calling Object::Relocate
|
|
// on each input object. But if there are any Output_section_data
|
|
// objects we do need to write them out here.
|
|
virtual void
|
|
do_write(Output_file*);
|
|
|
|
// Return the address alignment--function required by parent class.
|
|
uint64_t
|
|
do_addralign() const
|
|
{ return this->addralign_; }
|
|
|
|
// Return whether there is a load address.
|
|
bool
|
|
do_has_load_address() const
|
|
{ return this->has_load_address_; }
|
|
|
|
// Return the load address.
|
|
uint64_t
|
|
do_load_address() const
|
|
{
|
|
gold_assert(this->has_load_address_);
|
|
return this->load_address_;
|
|
}
|
|
|
|
// Return whether this is an Output_section.
|
|
bool
|
|
do_is_section() const
|
|
{ return true; }
|
|
|
|
// Return whether this is a section of the specified type.
|
|
bool
|
|
do_is_section_type(elfcpp::Elf_Word type) const
|
|
{ return this->type_ == type; }
|
|
|
|
// Return whether the specified section flag is set.
|
|
bool
|
|
do_is_section_flag_set(elfcpp::Elf_Xword flag) const
|
|
{ return (this->flags_ & flag) != 0; }
|
|
|
|
// Set the TLS offset. Called only for SHT_TLS sections.
|
|
void
|
|
do_set_tls_offset(uint64_t tls_base);
|
|
|
|
// Return the TLS offset, relative to the base of the TLS segment.
|
|
// Valid only for SHT_TLS sections.
|
|
uint64_t
|
|
do_tls_offset() const
|
|
{ return this->tls_offset_; }
|
|
|
|
// This may be implemented by a child class.
|
|
virtual void
|
|
do_finalize_name(Layout*)
|
|
{ }
|
|
|
|
// Print to the map file.
|
|
virtual void
|
|
do_print_to_mapfile(Mapfile*) const;
|
|
|
|
// Record that this section requires postprocessing after all
|
|
// relocations have been applied. This is called by a child class.
|
|
void
|
|
set_requires_postprocessing()
|
|
{
|
|
this->requires_postprocessing_ = true;
|
|
this->after_input_sections_ = true;
|
|
}
|
|
|
|
// Write all the data of an Output_section into the postprocessing
|
|
// buffer.
|
|
void
|
|
write_to_postprocessing_buffer();
|
|
|
|
private:
|
|
// In some cases we need to keep a list of the input sections
|
|
// associated with this output section. We only need the list if we
|
|
// might have to change the offsets of the input section within the
|
|
// output section after we add the input section. The ordinary
|
|
// input sections will be written out when we process the object
|
|
// file, and as such we don't need to track them here. We do need
|
|
// to track Output_section_data objects here. We store instances of
|
|
// this structure in a std::vector, so it must be a POD. There can
|
|
// be many instances of this structure, so we use a union to save
|
|
// some space.
|
|
class Input_section
|
|
{
|
|
public:
|
|
Input_section()
|
|
: shndx_(0), p2align_(0)
|
|
{
|
|
this->u1_.data_size = 0;
|
|
this->u2_.object = NULL;
|
|
}
|
|
|
|
// For an ordinary input section.
|
|
Input_section(Relobj* object, unsigned int shndx, off_t data_size,
|
|
uint64_t addralign)
|
|
: shndx_(shndx),
|
|
p2align_(ffsll(static_cast<long long>(addralign)))
|
|
{
|
|
gold_assert(shndx != OUTPUT_SECTION_CODE
|
|
&& shndx != MERGE_DATA_SECTION_CODE
|
|
&& shndx != MERGE_STRING_SECTION_CODE);
|
|
this->u1_.data_size = data_size;
|
|
this->u2_.object = object;
|
|
}
|
|
|
|
// For a non-merge output section.
|
|
Input_section(Output_section_data* posd)
|
|
: shndx_(OUTPUT_SECTION_CODE), p2align_(0)
|
|
{
|
|
this->u1_.data_size = 0;
|
|
this->u2_.posd = posd;
|
|
}
|
|
|
|
// For a merge section.
|
|
Input_section(Output_section_data* posd, bool is_string, uint64_t entsize)
|
|
: shndx_(is_string
|
|
? MERGE_STRING_SECTION_CODE
|
|
: MERGE_DATA_SECTION_CODE),
|
|
p2align_(0)
|
|
{
|
|
this->u1_.entsize = entsize;
|
|
this->u2_.posd = posd;
|
|
}
|
|
|
|
// The required alignment.
|
|
uint64_t
|
|
addralign() const
|
|
{
|
|
if (!this->is_input_section())
|
|
return this->u2_.posd->addralign();
|
|
return (this->p2align_ == 0
|
|
? 0
|
|
: static_cast<uint64_t>(1) << (this->p2align_ - 1));
|
|
}
|
|
|
|
// Return the required size.
|
|
off_t
|
|
data_size() const;
|
|
|
|
// Whether this is an input section.
|
|
bool
|
|
is_input_section() const
|
|
{
|
|
return (this->shndx_ != OUTPUT_SECTION_CODE
|
|
&& this->shndx_ != MERGE_DATA_SECTION_CODE
|
|
&& this->shndx_ != MERGE_STRING_SECTION_CODE);
|
|
}
|
|
|
|
// Return whether this is a merge section which matches the
|
|
// parameters.
|
|
bool
|
|
is_merge_section(bool is_string, uint64_t entsize,
|
|
uint64_t addralign) const
|
|
{
|
|
return (this->shndx_ == (is_string
|
|
? MERGE_STRING_SECTION_CODE
|
|
: MERGE_DATA_SECTION_CODE)
|
|
&& this->u1_.entsize == entsize
|
|
&& this->addralign() == addralign);
|
|
}
|
|
|
|
// Return the object for an input section.
|
|
Relobj*
|
|
relobj() const
|
|
{
|
|
gold_assert(this->is_input_section());
|
|
return this->u2_.object;
|
|
}
|
|
|
|
// Return the input section index for an input section.
|
|
unsigned int
|
|
shndx() const
|
|
{
|
|
gold_assert(this->is_input_section());
|
|
return this->shndx_;
|
|
}
|
|
|
|
// Set the output section.
|
|
void
|
|
set_output_section(Output_section* os)
|
|
{
|
|
gold_assert(!this->is_input_section());
|
|
this->u2_.posd->set_output_section(os);
|
|
}
|
|
|
|
// Set the address and file offset. This is called during
|
|
// Layout::finalize. SECTION_FILE_OFFSET is the file offset of
|
|
// the enclosing section.
|
|
void
|
|
set_address_and_file_offset(uint64_t address, off_t file_offset,
|
|
off_t section_file_offset);
|
|
|
|
// Reset the address and file offset.
|
|
void
|
|
reset_address_and_file_offset();
|
|
|
|
// Finalize the data size.
|
|
void
|
|
finalize_data_size();
|
|
|
|
// Add an input section, for SHF_MERGE sections.
|
|
bool
|
|
add_input_section(Relobj* object, unsigned int shndx)
|
|
{
|
|
gold_assert(this->shndx_ == MERGE_DATA_SECTION_CODE
|
|
|| this->shndx_ == MERGE_STRING_SECTION_CODE);
|
|
return this->u2_.posd->add_input_section(object, shndx);
|
|
}
|
|
|
|
// Given an input OBJECT, an input section index SHNDX within that
|
|
// object, and an OFFSET relative to the start of that input
|
|
// section, return whether or not the output offset is known. If
|
|
// this function returns true, it sets *POUTPUT to the offset in
|
|
// the output section, relative to the start of the input section
|
|
// in the output section. *POUTPUT may be different from OFFSET
|
|
// for a merged section.
|
|
bool
|
|
output_offset(const Relobj* object, unsigned int shndx,
|
|
section_offset_type offset,
|
|
section_offset_type *poutput) const;
|
|
|
|
// Return whether this is the merge section for the input section
|
|
// SHNDX in OBJECT.
|
|
bool
|
|
is_merge_section_for(const Relobj* object, unsigned int shndx) const;
|
|
|
|
// Write out the data. This does nothing for an input section.
|
|
void
|
|
write(Output_file*);
|
|
|
|
// Write the data to a buffer. This does nothing for an input
|
|
// section.
|
|
void
|
|
write_to_buffer(unsigned char*);
|
|
|
|
// Print to a map file.
|
|
void
|
|
print_to_mapfile(Mapfile*) const;
|
|
|
|
// Print statistics about merge sections to stderr.
|
|
void
|
|
print_merge_stats(const char* section_name)
|
|
{
|
|
if (this->shndx_ == MERGE_DATA_SECTION_CODE
|
|
|| this->shndx_ == MERGE_STRING_SECTION_CODE)
|
|
this->u2_.posd->print_merge_stats(section_name);
|
|
}
|
|
|
|
private:
|
|
// Code values which appear in shndx_. If the value is not one of
|
|
// these codes, it is the input section index in the object file.
|
|
enum
|
|
{
|
|
// An Output_section_data.
|
|
OUTPUT_SECTION_CODE = -1U,
|
|
// An Output_section_data for an SHF_MERGE section with
|
|
// SHF_STRINGS not set.
|
|
MERGE_DATA_SECTION_CODE = -2U,
|
|
// An Output_section_data for an SHF_MERGE section with
|
|
// SHF_STRINGS set.
|
|
MERGE_STRING_SECTION_CODE = -3U
|
|
};
|
|
|
|
// For an ordinary input section, this is the section index in the
|
|
// input file. For an Output_section_data, this is
|
|
// OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
|
|
// MERGE_STRING_SECTION_CODE.
|
|
unsigned int shndx_;
|
|
// The required alignment, stored as a power of 2.
|
|
unsigned int p2align_;
|
|
union
|
|
{
|
|
// For an ordinary input section, the section size.
|
|
off_t data_size;
|
|
// For OUTPUT_SECTION_CODE, this is not used. For
|
|
// MERGE_DATA_SECTION_CODE or MERGE_STRING_SECTION_CODE, the
|
|
// entity size.
|
|
uint64_t entsize;
|
|
} u1_;
|
|
union
|
|
{
|
|
// For an ordinary input section, the object which holds the
|
|
// input section.
|
|
Relobj* object;
|
|
// For OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
|
|
// MERGE_STRING_SECTION_CODE, the data.
|
|
Output_section_data* posd;
|
|
} u2_;
|
|
};
|
|
|
|
typedef std::vector<Input_section> Input_section_list;
|
|
|
|
// This class is used to sort the input sections.
|
|
class Input_section_sort_entry;
|
|
|
|
// This is the sort comparison function.
|
|
struct Input_section_sort_compare
|
|
{
|
|
bool
|
|
operator()(const Input_section_sort_entry&,
|
|
const Input_section_sort_entry&) const;
|
|
};
|
|
|
|
// Fill data. This is used to fill in data between input sections.
|
|
// It is also used for data statements (BYTE, WORD, etc.) in linker
|
|
// scripts. When we have to keep track of the input sections, we
|
|
// can use an Output_data_const, but we don't want to have to keep
|
|
// track of input sections just to implement fills.
|
|
class Fill
|
|
{
|
|
public:
|
|
Fill(off_t section_offset, off_t length)
|
|
: section_offset_(section_offset),
|
|
length_(convert_to_section_size_type(length))
|
|
{ }
|
|
|
|
// Return section offset.
|
|
off_t
|
|
section_offset() const
|
|
{ return this->section_offset_; }
|
|
|
|
// Return fill length.
|
|
section_size_type
|
|
length() const
|
|
{ return this->length_; }
|
|
|
|
private:
|
|
// The offset within the output section.
|
|
off_t section_offset_;
|
|
// The length of the space to fill.
|
|
section_size_type length_;
|
|
};
|
|
|
|
typedef std::vector<Fill> Fill_list;
|
|
|
|
// Add a new output section by Input_section.
|
|
void
|
|
add_output_section_data(Input_section*);
|
|
|
|
// Add an SHF_MERGE input section. Returns true if the section was
|
|
// handled.
|
|
bool
|
|
add_merge_input_section(Relobj* object, unsigned int shndx, uint64_t flags,
|
|
uint64_t entsize, uint64_t addralign);
|
|
|
|
// Add an output SHF_MERGE section POSD to this output section.
|
|
// IS_STRING indicates whether it is a SHF_STRINGS section, and
|
|
// ENTSIZE is the entity size. This returns the entry added to
|
|
// input_sections_.
|
|
void
|
|
add_output_merge_section(Output_section_data* posd, bool is_string,
|
|
uint64_t entsize);
|
|
|
|
// Sort the attached input sections.
|
|
void
|
|
sort_attached_input_sections();
|
|
|
|
// Most of these fields are only valid after layout.
|
|
|
|
// The name of the section. This will point into a Stringpool.
|
|
const char* name_;
|
|
// The section address is in the parent class.
|
|
// The section alignment.
|
|
uint64_t addralign_;
|
|
// The section entry size.
|
|
uint64_t entsize_;
|
|
// The load address. This is only used when using a linker script
|
|
// with a SECTIONS clause. The has_load_address_ field indicates
|
|
// whether this field is valid.
|
|
uint64_t load_address_;
|
|
// The file offset is in the parent class.
|
|
// Set the section link field to the index of this section.
|
|
const Output_data* link_section_;
|
|
// If link_section_ is NULL, this is the link field.
|
|
unsigned int link_;
|
|
// Set the section info field to the index of this section.
|
|
const Output_section* info_section_;
|
|
// If info_section_ is NULL, set the info field to the symbol table
|
|
// index of this symbol.
|
|
const Symbol* info_symndx_;
|
|
// If info_section_ and info_symndx_ are NULL, this is the section
|
|
// info field.
|
|
unsigned int info_;
|
|
// The section type.
|
|
const elfcpp::Elf_Word type_;
|
|
// The section flags.
|
|
elfcpp::Elf_Xword flags_;
|
|
// The section index.
|
|
unsigned int out_shndx_;
|
|
// If there is a STT_SECTION for this output section in the normal
|
|
// symbol table, this is the symbol index. This starts out as zero.
|
|
// It is initialized in Layout::finalize() to be the index, or -1U
|
|
// if there isn't one.
|
|
unsigned int symtab_index_;
|
|
// If there is a STT_SECTION for this output section in the dynamic
|
|
// symbol table, this is the symbol index. This starts out as zero.
|
|
// It is initialized in Layout::finalize() to be the index, or -1U
|
|
// if there isn't one.
|
|
unsigned int dynsym_index_;
|
|
// The input sections. This will be empty in cases where we don't
|
|
// need to keep track of them.
|
|
Input_section_list input_sections_;
|
|
// The offset of the first entry in input_sections_.
|
|
off_t first_input_offset_;
|
|
// The fill data. This is separate from input_sections_ because we
|
|
// often will need fill sections without needing to keep track of
|
|
// input sections.
|
|
Fill_list fills_;
|
|
// If the section requires postprocessing, this buffer holds the
|
|
// section contents during relocation.
|
|
unsigned char* postprocessing_buffer_;
|
|
// Whether this output section needs a STT_SECTION symbol in the
|
|
// normal symbol table. This will be true if there is a relocation
|
|
// which needs it.
|
|
bool needs_symtab_index_ : 1;
|
|
// Whether this output section needs a STT_SECTION symbol in the
|
|
// dynamic symbol table. This will be true if there is a dynamic
|
|
// relocation which needs it.
|
|
bool needs_dynsym_index_ : 1;
|
|
// Whether the link field of this output section should point to the
|
|
// normal symbol table.
|
|
bool should_link_to_symtab_ : 1;
|
|
// Whether the link field of this output section should point to the
|
|
// dynamic symbol table.
|
|
bool should_link_to_dynsym_ : 1;
|
|
// Whether this section should be written after all the input
|
|
// sections are complete.
|
|
bool after_input_sections_ : 1;
|
|
// Whether this section requires post processing after all
|
|
// relocations have been applied.
|
|
bool requires_postprocessing_ : 1;
|
|
// Whether an input section was mapped to this output section
|
|
// because of a SECTIONS clause in a linker script.
|
|
bool found_in_sections_clause_ : 1;
|
|
// Whether this section has an explicitly specified load address.
|
|
bool has_load_address_ : 1;
|
|
// True if the info_section_ field means the section index of the
|
|
// section, false if it means the symbol index of the corresponding
|
|
// section symbol.
|
|
bool info_uses_section_index_ : 1;
|
|
// True if the input sections attached to this output section may
|
|
// need sorting.
|
|
bool may_sort_attached_input_sections_ : 1;
|
|
// True if the input sections attached to this output section must
|
|
// be sorted.
|
|
bool must_sort_attached_input_sections_ : 1;
|
|
// True if the input sections attached to this output section have
|
|
// already been sorted.
|
|
bool attached_input_sections_are_sorted_ : 1;
|
|
// True if this section holds relro data.
|
|
bool is_relro_ : 1;
|
|
// True if this section holds relro local data.
|
|
bool is_relro_local_ : 1;
|
|
// For SHT_TLS sections, the offset of this section relative to the base
|
|
// of the TLS segment.
|
|
uint64_t tls_offset_;
|
|
};
|
|
|
|
// An output segment. PT_LOAD segments are built from collections of
|
|
// output sections. Other segments typically point within PT_LOAD
|
|
// segments, and are built directly as needed.
|
|
|
|
class Output_segment
|
|
{
|
|
public:
|
|
// Create an output segment, specifying the type and flags.
|
|
Output_segment(elfcpp::Elf_Word, elfcpp::Elf_Word);
|
|
|
|
// Return the virtual address.
|
|
uint64_t
|
|
vaddr() const
|
|
{ return this->vaddr_; }
|
|
|
|
// Return the physical address.
|
|
uint64_t
|
|
paddr() const
|
|
{ return this->paddr_; }
|
|
|
|
// Return the segment type.
|
|
elfcpp::Elf_Word
|
|
type() const
|
|
{ return this->type_; }
|
|
|
|
// Return the segment flags.
|
|
elfcpp::Elf_Word
|
|
flags() const
|
|
{ return this->flags_; }
|
|
|
|
// Return the memory size.
|
|
uint64_t
|
|
memsz() const
|
|
{ return this->memsz_; }
|
|
|
|
// Return the file size.
|
|
off_t
|
|
filesz() const
|
|
{ return this->filesz_; }
|
|
|
|
// Return the file offset.
|
|
off_t
|
|
offset() const
|
|
{ return this->offset_; }
|
|
|
|
// Return the maximum alignment of the Output_data.
|
|
uint64_t
|
|
maximum_alignment();
|
|
|
|
// Add an Output_section to this segment.
|
|
void
|
|
add_output_section(Output_section* os, elfcpp::Elf_Word seg_flags);
|
|
|
|
// Remove an Output_section from this segment. It is an error if it
|
|
// is not present.
|
|
void
|
|
remove_output_section(Output_section* os);
|
|
|
|
// Add an Output_data (which is not an Output_section) to the start
|
|
// of this segment.
|
|
void
|
|
add_initial_output_data(Output_data*);
|
|
|
|
// Return true if this segment has any sections which hold actual
|
|
// data, rather than being a BSS section.
|
|
bool
|
|
has_any_data_sections() const
|
|
{ return !this->output_data_.empty(); }
|
|
|
|
// Return the number of dynamic relocations applied to this segment.
|
|
unsigned int
|
|
dynamic_reloc_count() const;
|
|
|
|
// Return the address of the first section.
|
|
uint64_t
|
|
first_section_load_address() const;
|
|
|
|
// Return whether the addresses have been set already.
|
|
bool
|
|
are_addresses_set() const
|
|
{ return this->are_addresses_set_; }
|
|
|
|
// Set the addresses.
|
|
void
|
|
set_addresses(uint64_t vaddr, uint64_t paddr)
|
|
{
|
|
this->vaddr_ = vaddr;
|
|
this->paddr_ = paddr;
|
|
this->are_addresses_set_ = true;
|
|
}
|
|
|
|
// Set the segment flags. This is only used if we have a PHDRS
|
|
// clause which explicitly specifies the flags.
|
|
void
|
|
set_flags(elfcpp::Elf_Word flags)
|
|
{ this->flags_ = flags; }
|
|
|
|
// Set the address of the segment to ADDR and the offset to *POFF
|
|
// and set the addresses and offsets of all contained output
|
|
// sections accordingly. Set the section indexes of all contained
|
|
// output sections starting with *PSHNDX. If RESET is true, first
|
|
// reset the addresses of the contained sections. Return the
|
|
// address of the immediately following segment. Update *POFF and
|
|
// *PSHNDX. This should only be called for a PT_LOAD segment.
|
|
uint64_t
|
|
set_section_addresses(const Layout*, bool reset, uint64_t addr, off_t* poff,
|
|
unsigned int* pshndx);
|
|
|
|
// Set the minimum alignment of this segment. This may be adjusted
|
|
// upward based on the section alignments.
|
|
void
|
|
set_minimum_p_align(uint64_t align)
|
|
{ this->min_p_align_ = align; }
|
|
|
|
// Set the offset of this segment based on the section. This should
|
|
// only be called for a non-PT_LOAD segment.
|
|
void
|
|
set_offset();
|
|
|
|
// Set the TLS offsets of the sections contained in the PT_TLS segment.
|
|
void
|
|
set_tls_offsets();
|
|
|
|
// Return the number of output sections.
|
|
unsigned int
|
|
output_section_count() const;
|
|
|
|
// Return the section attached to the list segment with the lowest
|
|
// load address. This is used when handling a PHDRS clause in a
|
|
// linker script.
|
|
Output_section*
|
|
section_with_lowest_load_address() const;
|
|
|
|
// Write the segment header into *OPHDR.
|
|
template<int size, bool big_endian>
|
|
void
|
|
write_header(elfcpp::Phdr_write<size, big_endian>*);
|
|
|
|
// Write the section headers of associated sections into V.
|
|
template<int size, bool big_endian>
|
|
unsigned char*
|
|
write_section_headers(const Layout*, const Stringpool*, unsigned char* v,
|
|
unsigned int* pshndx) const;
|
|
|
|
// Print the output sections in the map file.
|
|
void
|
|
print_sections_to_mapfile(Mapfile*) const;
|
|
|
|
private:
|
|
Output_segment(const Output_segment&);
|
|
Output_segment& operator=(const Output_segment&);
|
|
|
|
typedef std::list<Output_data*> Output_data_list;
|
|
|
|
// Find the maximum alignment in an Output_data_list.
|
|
static uint64_t
|
|
maximum_alignment_list(const Output_data_list*);
|
|
|
|
// Return whether the first data section is a relro section.
|
|
bool
|
|
is_first_section_relro() const;
|
|
|
|
// Set the section addresses in an Output_data_list.
|
|
uint64_t
|
|
set_section_list_addresses(const Layout*, bool reset, Output_data_list*,
|
|
uint64_t addr, off_t* poff, unsigned int* pshndx,
|
|
bool* in_tls, bool* in_relro);
|
|
|
|
// Return the number of Output_sections in an Output_data_list.
|
|
unsigned int
|
|
output_section_count_list(const Output_data_list*) const;
|
|
|
|
// Return the number of dynamic relocs in an Output_data_list.
|
|
unsigned int
|
|
dynamic_reloc_count_list(const Output_data_list*) const;
|
|
|
|
// Find the section with the lowest load address in an
|
|
// Output_data_list.
|
|
void
|
|
lowest_load_address_in_list(const Output_data_list* pdl,
|
|
Output_section** found,
|
|
uint64_t* found_lma) const;
|
|
|
|
// Write the section headers in the list into V.
|
|
template<int size, bool big_endian>
|
|
unsigned char*
|
|
write_section_headers_list(const Layout*, const Stringpool*,
|
|
const Output_data_list*, unsigned char* v,
|
|
unsigned int* pshdx) const;
|
|
|
|
// Print a section list to the mapfile.
|
|
void
|
|
print_section_list_to_mapfile(Mapfile*, const Output_data_list*) const;
|
|
|
|
// The list of output data with contents attached to this segment.
|
|
Output_data_list output_data_;
|
|
// The list of output data without contents attached to this segment.
|
|
Output_data_list output_bss_;
|
|
// The segment virtual address.
|
|
uint64_t vaddr_;
|
|
// The segment physical address.
|
|
uint64_t paddr_;
|
|
// The size of the segment in memory.
|
|
uint64_t memsz_;
|
|
// The maximum section alignment. The is_max_align_known_ field
|
|
// indicates whether this has been finalized.
|
|
uint64_t max_align_;
|
|
// The required minimum value for the p_align field. This is used
|
|
// for PT_LOAD segments. Note that this does not mean that
|
|
// addresses should be aligned to this value; it means the p_paddr
|
|
// and p_vaddr fields must be congruent modulo this value. For
|
|
// non-PT_LOAD segments, the dynamic linker works more efficiently
|
|
// if the p_align field has the more conventional value, although it
|
|
// can align as needed.
|
|
uint64_t min_p_align_;
|
|
// The offset of the segment data within the file.
|
|
off_t offset_;
|
|
// The size of the segment data in the file.
|
|
off_t filesz_;
|
|
// The segment type;
|
|
elfcpp::Elf_Word type_;
|
|
// The segment flags.
|
|
elfcpp::Elf_Word flags_;
|
|
// Whether we have finalized max_align_.
|
|
bool is_max_align_known_ : 1;
|
|
// Whether vaddr and paddr were set by a linker script.
|
|
bool are_addresses_set_ : 1;
|
|
};
|
|
|
|
// This class represents the output file.
|
|
|
|
class Output_file
|
|
{
|
|
public:
|
|
Output_file(const char* name);
|
|
|
|
// Indicate that this is a temporary file which should not be
|
|
// output.
|
|
void
|
|
set_is_temporary()
|
|
{ this->is_temporary_ = true; }
|
|
|
|
// Open the output file. FILE_SIZE is the final size of the file.
|
|
void
|
|
open(off_t file_size);
|
|
|
|
// Resize the output file.
|
|
void
|
|
resize(off_t file_size);
|
|
|
|
// Close the output file (flushing all buffered data) and make sure
|
|
// there are no errors.
|
|
void
|
|
close();
|
|
|
|
// We currently always use mmap which makes the view handling quite
|
|
// simple. In the future we may support other approaches.
|
|
|
|
// Write data to the output file.
|
|
void
|
|
write(off_t offset, const void* data, size_t len)
|
|
{ memcpy(this->base_ + offset, data, len); }
|
|
|
|
// Get a buffer to use to write to the file, given the offset into
|
|
// the file and the size.
|
|
unsigned char*
|
|
get_output_view(off_t start, size_t size)
|
|
{
|
|
gold_assert(start >= 0
|
|
&& start + static_cast<off_t>(size) <= this->file_size_);
|
|
return this->base_ + start;
|
|
}
|
|
|
|
// VIEW must have been returned by get_output_view. Write the
|
|
// buffer to the file, passing in the offset and the size.
|
|
void
|
|
write_output_view(off_t, size_t, unsigned char*)
|
|
{ }
|
|
|
|
// Get a read/write buffer. This is used when we want to write part
|
|
// of the file, read it in, and write it again.
|
|
unsigned char*
|
|
get_input_output_view(off_t start, size_t size)
|
|
{ return this->get_output_view(start, size); }
|
|
|
|
// Write a read/write buffer back to the file.
|
|
void
|
|
write_input_output_view(off_t, size_t, unsigned char*)
|
|
{ }
|
|
|
|
// Get a read buffer. This is used when we just want to read part
|
|
// of the file back it in.
|
|
const unsigned char*
|
|
get_input_view(off_t start, size_t size)
|
|
{ return this->get_output_view(start, size); }
|
|
|
|
// Release a read bfufer.
|
|
void
|
|
free_input_view(off_t, size_t, const unsigned char*)
|
|
{ }
|
|
|
|
private:
|
|
// Map the file into memory and return a pointer to the map.
|
|
void
|
|
map();
|
|
|
|
// Unmap the file from memory (and flush to disk buffers).
|
|
void
|
|
unmap();
|
|
|
|
// File name.
|
|
const char* name_;
|
|
// File descriptor.
|
|
int o_;
|
|
// File size.
|
|
off_t file_size_;
|
|
// Base of file mapped into memory.
|
|
unsigned char* base_;
|
|
// True iff base_ points to a memory buffer rather than an output file.
|
|
bool map_is_anonymous_;
|
|
// True if this is a temporary file which should not be output.
|
|
bool is_temporary_;
|
|
};
|
|
|
|
} // End namespace gold.
|
|
|
|
#endif // !defined(GOLD_OUTPUT_H)
|