// output.h -- manage the output file for gold -*- C++ -*-
-// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include <vector>
#include "elfcpp.h"
+#include "mapfile.h"
#include "layout.h"
#include "reloc-types.h"
class Object;
class Symbol;
class Output_file;
+class Output_merge_base;
class Output_section;
class Relocatable_relocs;
class Target;
explicit Output_data()
: address_(0), data_size_(0), offset_(-1),
is_address_valid_(false), is_data_size_valid_(false),
- is_offset_valid_(false),
+ is_offset_valid_(false), is_data_size_fixed_(false),
dynamic_reloc_count_(0)
{ }
return this->data_size_;
}
+ // Return true if data size is fixed.
+ bool
+ is_data_size_fixed() const
+ { return this->is_data_size_fixed_; }
+
// 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.
{
this->is_address_valid_ = false;
this->is_offset_valid_ = false;
- this->is_data_size_valid_ = false;
+ if (!this->is_data_size_fixed_)
+ this->is_data_size_valid_ = false;
this->do_reset_address_and_file_offset();
}
+ // Return true if address and file offset already have reset values. In
+ // other words, calling reset_address_and_file_offset will not change them.
+ bool
+ address_and_file_offset_have_reset_values() const
+ { return this->do_address_and_file_offset_have_reset_values(); }
+
// Return the required alignment.
uint64_t
addralign() const
output_section()
{ return this->do_output_section(); }
+ const Output_section*
+ output_section() const
+ { return this->do_output_section(); }
+
// Return the output section index, if there is an output section.
unsigned int
out_shndx() const
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.
do_output_section()
{ return NULL; }
+ virtual const Output_section*
+ do_output_section() const
+ { return NULL; }
+
// Return the output section index, if there is an output section.
virtual unsigned int
do_out_shndx() const
do_reset_address_and_file_offset()
{ }
+ // Return true if address and file offset already have reset values. In
+ // other words, calling reset_address_and_file_offset will not change them.
+ // A child class overriding do_reset_address_and_file_offset may need to
+ // also override this.
+ virtual bool
+ do_address_and_file_offset_have_reset_values() const
+ { return !this->is_address_valid_ && !this->is_offset_valid_; }
+
// Set the TLS offset. Called only for SHT_TLS sections.
virtual void
do_set_tls_offset(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.
+ // Reset the address. The Output_section class needs this when an
+ // SHF_ALLOC input section is added to an output section which was
+ // formerly not SHF_ALLOC.
+ void
+ mark_address_invalid()
+ { this->is_address_valid_ = false; }
+
// Set the size of the data.
void
set_data_size(off_t data_size)
{
- gold_assert(!this->is_data_size_valid_);
+ gold_assert(!this->is_data_size_valid_
+ && !this->is_data_size_fixed_);
this->data_size_ = data_size;
this->is_data_size_valid_ = true;
}
+ // Fix the data size. Once it is fixed, it cannot be changed
+ // and the data size remains always valid.
+ void
+ fix_data_size()
+ {
+ gold_assert(this->is_data_size_valid_);
+ this->is_data_size_fixed_ = true;
+ }
+
// Get the current data size--this is for the convenience of
// sections which build up their size over time.
off_t
bool is_data_size_valid_;
// Whether offset_ is valid.
bool is_offset_valid_;
+ // Whether data size is fixed.
+ bool is_data_size_fixed_;
// Count of dynamic relocations applied to this section.
unsigned int dynamic_reloc_count_;
};
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")); }
+
+ // Set final data size.
+ void
+ set_final_data_size()
+ { this->set_data_size(this->do_size()); }
+
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*);
+ // Compute data size.
+ off_t
+ do_size() const;
+
const Layout* layout_;
const Layout::Segment_list* segment_list_;
const Layout::Section_list* section_list_;
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")); }
+
+ // Set final data size.
+ void
+ set_final_data_size()
+ { this->set_data_size(this->do_size()); }
+
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*);
+ // Compute the current size.
+ off_t
+ do_size() const;
+
const Layout::Segment_list& segment_list_;
};
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")); }
+
+ // Set final data size.
+ void
+ set_final_data_size(void)
+ { this->set_data_size(this->do_size()); }
+
private:
// Write the data to the file with the right size and endianness.
template<int size, bool big_endian>
typename elfcpp::Elf_types<size>::Elf_Addr
entry();
+ // Compute the current data size.
+ off_t
+ do_size() const;
+
const Target* target_;
const Symbol_table* symtab_;
const Output_segment_headers* segment_header_;
class Output_section_data : public Output_data
{
public:
- Output_section_data(off_t data_size, uint64_t addralign)
+ Output_section_data(off_t data_size, uint64_t addralign,
+ bool is_data_size_fixed)
: Output_data(), output_section_(NULL), addralign_(addralign)
- { this->set_data_size(data_size); }
+ {
+ this->set_data_size(data_size);
+ if (is_data_size_fixed)
+ this->fix_data_size();
+ }
Output_section_data(uint64_t addralign)
: Output_data(), output_section_(NULL), addralign_(addralign)
do_output_section()
{ return this->output_section_; }
+ const Output_section*
+ do_output_section() const
+ { return this->output_section_; }
+
// Return the section index of the output section.
unsigned int
do_out_shndx() const;
{
public:
Output_data_const(const std::string& data, uint64_t addralign)
- : Output_section_data(data.size(), addralign), data_(data)
+ : Output_section_data(data.size(), addralign, true), data_(data)
{ }
Output_data_const(const char* p, off_t len, uint64_t addralign)
- : Output_section_data(len, addralign), data_(p, len)
+ : Output_section_data(len, addralign, true), data_(p, len)
{ }
Output_data_const(const unsigned char* p, off_t len, uint64_t addralign)
- : Output_section_data(len, addralign),
+ : Output_section_data(len, addralign, true),
data_(reinterpret_cast<const char*>(p), len)
{ }
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_;
};
{
public:
Output_data_const_buffer(const unsigned char* p, off_t len,
- uint64_t addralign)
- : Output_section_data(len, addralign), p_(p)
+ uint64_t addralign, const char* map_name)
+ : Output_section_data(len, addralign, true),
+ p_(p), map_name_(map_name)
{ }
protected:
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
class Output_data_fixed_space : public Output_section_data
{
public:
- Output_data_fixed_space(off_t data_size, uint64_t addralign)
- : Output_section_data(data_size, addralign)
+ Output_data_fixed_space(off_t data_size, uint64_t addralign,
+ const char* map_name)
+ : Output_section_data(data_size, addralign, true),
+ map_name_(map_name)
{ }
protected:
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
class Output_data_space : public Output_section_data_build
{
public:
- explicit Output_data_space(uint64_t addralign)
- : Output_section_data_build(addralign)
+ explicit Output_data_space(uint64_t addralign, const char* map_name)
+ : Output_section_data_build(addralign),
+ map_name_(map_name)
{ }
// Set the alignment.
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, true)
+ { }
+
+ 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.
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_;
};
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend;
+ static const Address invalid_address = static_cast<Address>(0) - 1;
+
// An uninitialized entry. We need this because we want to put
// instances of this class into an STL container.
Output_reloc()
// A reloc against a global symbol.
Output_reloc(Symbol* gsym, unsigned int type, Output_data* od,
- Address address, bool is_relative);
+ Address address, bool is_relative, bool is_symbolless);
- Output_reloc(Symbol* gsym, unsigned int type, Relobj* relobj,
- unsigned int shndx, Address address, bool is_relative);
+ Output_reloc(Symbol* gsym, unsigned int type,
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address, bool is_relative,
+ bool is_symbolless);
// 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);
+ bool is_symbolless, 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);
+ bool is_symbolless, 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,
+ Output_reloc(Output_section* os, unsigned int type,
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address);
+
+ // An absolute relocation with no symbol.
+
+ Output_reloc(unsigned int type, Output_data* od, Address address);
+
+ Output_reloc(unsigned int type, Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address);
+
+ // A target specific relocation. The target will be called to get
+ // the symbol index, passing ARG. The type and offset will be set
+ // as for other relocation types.
+
+ Output_reloc(unsigned int type, void* arg, Output_data* od,
+ Address address);
+
+ Output_reloc(unsigned int type, void* arg,
+ Sized_relobj<size, big_endian>* relobj,
unsigned int shndx, Address address);
- // Return TRUE if this is a RELATIVE relocation.
+ // Return the reloc type.
+ unsigned int
+ type() const
+ { return this->type_; }
+
+ // Return whether this is a RELATIVE relocation.
bool
is_relative() const
{ return this->is_relative_; }
+ // Return whether this is a relocation which should not use
+ // a symbol, but which obtains its addend from a symbol.
+ bool
+ is_symbolless() const
+ { return this->is_symbolless_; }
+
// 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->local_sym_index_ != TARGET_CODE
&& this->is_section_symbol_);
}
+ // Return whether this is a target specific relocation.
+ bool
+ is_target_specific() const
+ { return this->local_sym_index_ == TARGET_CODE; }
+
+ // Return the argument to pass to the target for a target specific
+ // relocation.
+ void*
+ target_arg() const
+ {
+ gold_assert(this->local_sym_index_ == TARGET_CODE);
+ return this->u1_.arg;
+ }
+
// 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
+ Address
local_section_offset(Addend addend) const;
// Get the value of the symbol referred to by a Rel relocation when
get_symbol_index() const;
// Return the output address.
- section_offset_type
+ Address
get_address() const;
// Codes for local_sym_index_.
GSYM_CODE = -1U,
// Output section.
SECTION_CODE = -2U,
+ // Target specific.
+ TARGET_CODE = -3U,
// Invalid uninitialized entry.
- INVALID_CODE = -3U
+ INVALID_CODE = -4U
};
union
// For a relocation against an output section
// (this->local_sym_index_ == SECTION_CODE), the output section.
Output_section* os;
+ // For a target specific relocation, an argument to pass to the
+ // target.
+ void* arg;
} 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;
+ Sized_relobj<size, big_endian>* 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.
// 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.
+ // relocation against an output section, or TARGET_CODE for a target
+ // specific relocation, 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;
+ unsigned int type_ : 29;
// True if the relocation is a RELATIVE relocation.
bool is_relative_ : 1;
+ // True if the relocation is one which should not use
+ // a symbol, but which obtains its addend from a symbol.
+ bool is_symbolless_ : 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
// 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)
+ Address address, Addend addend, bool is_relative,
+ bool is_symbolless)
+ : rel_(gsym, type, od, address, is_relative, is_symbolless),
+ addend_(addend)
{ }
- Output_reloc(Symbol* gsym, unsigned int type, Relobj* relobj,
+ Output_reloc(Symbol* gsym, unsigned int type,
+ Sized_relobj<size, big_endian>* relobj,
unsigned int shndx, Address address, Addend addend,
- bool is_relative)
- : rel_(gsym, type, relobj, shndx, address, is_relative), addend_(addend)
+ bool is_relative, bool is_symbolless)
+ : rel_(gsym, type, relobj, shndx, address, is_relative,
+ is_symbolless), 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)
+ Addend addend, bool is_relative,
+ bool is_symbolless, bool is_section_symbol)
: rel_(relobj, local_sym_index, type, od, address, is_relative,
- is_section_symbol),
+ is_symbolless, 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)
+ Addend addend, bool is_relative,
+ bool is_symbolless, bool is_section_symbol)
: rel_(relobj, local_sym_index, type, shndx, address, is_relative,
- is_section_symbol),
+ is_symbolless, is_section_symbol),
addend_(addend)
{ }
: rel_(os, type, od, address), addend_(addend)
{ }
- Output_reloc(Output_section* os, unsigned int type, Relobj* relobj,
+ Output_reloc(Output_section* os, unsigned int type,
+ Sized_relobj<size, big_endian>* relobj,
unsigned int shndx, Address address, Addend addend)
: rel_(os, type, relobj, shndx, address), addend_(addend)
{ }
+ // An absolute relocation with no symbol.
+
+ Output_reloc(unsigned int type, Output_data* od, Address address,
+ Addend addend)
+ : rel_(type, od, address), addend_(addend)
+ { }
+
+ Output_reloc(unsigned int type, Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address, Addend addend)
+ : rel_(type, relobj, shndx, address), addend_(addend)
+ { }
+
+ // A target specific relocation. The target will be called to get
+ // the symbol index and the addend, passing ARG. The type and
+ // offset will be set as for other relocation types.
+
+ Output_reloc(unsigned int type, void* arg, Output_data* od,
+ Address address, Addend addend)
+ : rel_(type, arg, od, address), addend_(addend)
+ { }
+
+ Output_reloc(unsigned int type, void* arg,
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address, Addend addend)
+ : rel_(type, arg, relobj, shndx, address), addend_(addend)
+ { }
+
+ // Return whether this is a RELATIVE relocation.
+ bool
+ is_relative() const
+ { return this->rel_.is_relative(); }
+
+ // Return whether this is a relocation which should not use
+ // a symbol, but which obtains its addend from a symbol.
+ bool
+ is_symbolless() const
+ { return this->rel_.is_symbolless(); }
+
// Write the reloc entry to an output view.
void
write(unsigned char* pov) const;
Addend addend_;
};
+// Output_data_reloc_generic is a non-template base class for
+// Output_data_reloc_base. This gives the generic code a way to hold
+// a pointer to a reloc section.
+
+class Output_data_reloc_generic : public Output_section_data_build
+{
+ public:
+ Output_data_reloc_generic(int size, bool sort_relocs)
+ : Output_section_data_build(Output_data::default_alignment_for_size(size)),
+ relative_reloc_count_(0), sort_relocs_(sort_relocs)
+ { }
+
+ // Return the number of relative relocs in this section.
+ size_t
+ relative_reloc_count() const
+ { return this->relative_reloc_count_; }
+
+ // Whether we should sort the relocs.
+ bool
+ sort_relocs() const
+ { return this->sort_relocs_; }
+
+ protected:
+ // Note that we've added another relative reloc.
+ void
+ bump_relative_reloc_count()
+ { ++this->relative_reloc_count_; }
+
+ private:
+ // The number of relative relocs added to this section. This is to
+ // support DT_RELCOUNT.
+ size_t relative_reloc_count_;
+ // Whether to sort the relocations when writing them out, to make
+ // the dynamic linker more efficient.
+ bool sort_relocs_;
+};
+
// 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
// the reloc type.
template<int sh_type, bool dynamic, int size, bool big_endian>
-class Output_data_reloc_base : public Output_section_data_build
+class Output_data_reloc_base : public Output_data_reloc_generic
{
public:
typedef Output_reloc<sh_type, dynamic, size, big_endian> Output_reloc_type;
// 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)
+ : Output_data_reloc_generic(size, sort_relocs)
{ }
protected:
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();
+ if (reloc.is_relative())
+ this->bump_relative_reloc_count();
}
private:
// 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.
void
add_global(Symbol* gsym, unsigned int type, Output_data* od, Address address)
- { this->add(od, Output_reloc_type(gsym, type, od, address, false)); }
+ { this->add(od, Output_reloc_type(gsym, type, od, address, false, false)); }
void
- add_global(Symbol* gsym, unsigned int type, Output_data* od, Relobj* relobj,
+ add_global(Symbol* gsym, unsigned int type, Output_data* od,
+ Sized_relobj<size, big_endian>* relobj,
unsigned int shndx, Address address)
{ this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
- false)); }
+ false, false)); }
// These are to simplify the Copy_relocs class.
}
void
- add_global(Symbol* gsym, unsigned int type, Output_data* od, Relobj* relobj,
+ add_global(Symbol* gsym, unsigned int type, Output_data* od,
+ Sized_relobj<size, big_endian>* relobj,
unsigned int shndx, Address address, Address addend)
{
gold_assert(addend == 0);
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)); }
+ { this->add(od, Output_reloc_type(gsym, type, od, address, true, true)); }
void
add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
- Relobj* relobj, unsigned int shndx, Address address)
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address)
+ {
+ this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
+ true, true));
+ }
+
+ // Add a global relocation which does not use a symbol for the relocation,
+ // but which gets its addend from a symbol.
+
+ void
+ add_symbolless_global_addend(Symbol* gsym, unsigned int type,
+ Output_data* od, Address address)
+ { this->add(od, Output_reloc_type(gsym, type, od, address, false, true)); }
+
+ void
+ add_symbolless_global_addend(Symbol* gsym, unsigned int type,
+ Output_data* od,
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address)
{
this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
- true));
+ false, true));
}
// Add a reloc against a local symbol.
Output_data* od, Address address)
{
this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
- address, false, false));
+ address, false, false, false));
}
void
Output_data* od, unsigned int shndx, Address address)
{
this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
- address, false, false));
+ address, false, false, false));
}
// Add a RELATIVE reloc against a local symbol.
Output_data* od, Address address)
{
this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
- address, true, false));
+ address, true, true, false));
}
void
Output_data* od, unsigned int shndx, Address address)
{
this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
- address, true, false));
+ address, true, true, false));
+ }
+
+ // Add a local relocation which does not use a symbol for the relocation,
+ // but which gets its addend from a symbol.
+
+ void
+ add_symbolless_local_addend(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, true, false));
+ }
+
+ void
+ add_symbolless_local_addend(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, true, false));
}
// Add a reloc against a local section symbol. This will be
Output_data* od, Address address)
{
this->add(od, Output_reloc_type(relobj, input_shndx, type, od,
- address, false, true));
+ address, false, false, true));
}
void
Output_data* od, unsigned int shndx, Address address)
{
this->add(od, Output_reloc_type(relobj, input_shndx, type, shndx,
- address, false, true));
+ address, false, 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,
- Relobj* relobj, unsigned int shndx, Address address)
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address)
{ this->add(od, Output_reloc_type(os, type, relobj, shndx, address)); }
+
+ // Add an absolute relocation.
+
+ void
+ add_absolute(unsigned int type, Output_data* od, Address address)
+ { this->add(od, Output_reloc_type(type, od, address)); }
+
+ void
+ add_absolute(unsigned int type, Output_data* od,
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address)
+ { this->add(od, Output_reloc_type(type, relobj, shndx, address)); }
+
+ // Add a target specific relocation. A target which calls this must
+ // define the reloc_symbol_index and reloc_addend virtual functions.
+
+ void
+ add_target_specific(unsigned int type, void* arg, Output_data* od,
+ Address address)
+ { this->add(od, Output_reloc_type(type, arg, od, address)); }
+
+ void
+ add_target_specific(unsigned int type, void* arg, Output_data* od,
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address)
+ { this->add(od, Output_reloc_type(type, arg, relobj, shndx, address)); }
};
// The SHT_RELA version of Output_data_reloc.
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)); }
+ false, false)); }
void
- add_global(Symbol* gsym, unsigned int type, Output_data* od, Relobj* relobj,
+ add_global(Symbol* gsym, unsigned int type, Output_data* od,
+ Sized_relobj<size, big_endian>* relobj,
unsigned int shndx, Address address,
Addend addend)
{ this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
- addend, false)); }
+ addend, false, false)); }
// Add a RELATIVE reloc against a global symbol. The final output
// relocation will not reference the symbol, but we must keep the symbol
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)); }
+ { this->add(od, Output_reloc_type(gsym, type, od, address, addend, true,
+ true)); }
void
add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
- Relobj* relobj, unsigned int shndx, Address address,
- Addend addend)
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address, Addend addend)
+ { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
+ addend, true, true)); }
+
+ // Add a global relocation which does not use a symbol for the relocation,
+ // but which gets its addend from a symbol.
+
+ void
+ add_symbolless_global_addend(Symbol* gsym, unsigned int type, Output_data* od,
+ Address address, Addend addend)
+ { this->add(od, Output_reloc_type(gsym, type, od, address, addend,
+ false, true)); }
+
+ void
+ add_symbolless_global_addend(Symbol* gsym, unsigned int type,
+ Output_data* od,
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address, Addend addend)
{ this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
- addend, true)); }
+ addend, false, true)); }
// Add a reloc against a local symbol.
Output_data* od, Address address, Addend addend)
{
this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
- addend, false, false));
+ addend, false, false, false));
}
void
Addend addend)
{
this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
- address, addend, false, false));
+ address, addend, false, false, false));
}
// Add a RELATIVE reloc against a local symbol.
Output_data* od, Address address, Addend addend)
{
this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
- addend, true, false));
+ addend, true, true, false));
}
void
Addend addend)
{
this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
- address, addend, true, false));
+ address, addend, true, true, false));
+ }
+
+ // Add a local relocation which does not use a symbol for the relocation,
+ // but which gets it's addend from a symbol.
+
+ void
+ add_symbolless_local_addend(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, true, false));
+ }
+
+ void
+ add_symbolless_local_addend(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, true, false));
}
// Add a reloc against a local section symbol. This will be
Output_data* od, Address address, Addend addend)
{
this->add(od, Output_reloc_type(relobj, input_shndx, type, od, address,
- addend, false, true));
+ addend, false, false, true));
}
void
Addend addend)
{
this->add(od, Output_reloc_type(relobj, input_shndx, type, shndx,
- address, addend, false, true));
+ address, addend, false, false, true));
}
// A reloc against the STT_SECTION symbol of an output section.
{ this->add(os, Output_reloc_type(os, type, od, address, addend)); }
void
- add_output_section(Output_section* os, unsigned int type, Relobj* relobj,
+ add_output_section(Output_section* os, unsigned int type,
+ Sized_relobj<size, big_endian>* relobj,
unsigned int shndx, Address address, Addend addend)
{ this->add(os, Output_reloc_type(os, type, relobj, shndx, address,
addend)); }
+
+ // Add an absolute relocation.
+
+ void
+ add_absolute(unsigned int type, Output_data* od, Address address,
+ Addend addend)
+ { this->add(od, Output_reloc_type(type, od, address, addend)); }
+
+ void
+ add_absolute(unsigned int type, Output_data* od,
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address, Addend addend)
+ { this->add(od, Output_reloc_type(type, relobj, shndx, address, addend)); }
+
+ // Add a target specific relocation. A target which calls this must
+ // define the reloc_symbol_index and reloc_addend virtual functions.
+
+ void
+ add_target_specific(unsigned int type, void* arg, Output_data* od,
+ Address address, Addend addend)
+ { this->add(od, Output_reloc_type(type, arg, od, address, addend)); }
+
+ void
+ add_target_specific(unsigned int type, void* arg, Output_data* od,
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address, Addend addend)
+ {
+ this->add(od, Output_reloc_type(type, arg, relobj, shndx, address,
+ addend));
+ }
};
// Output_relocatable_relocs represents a relocation section in a
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_;
void
do_write(Output_file*);
+ // Write to a map file.
+ void
+ do_print_to_mapfile(Mapfile* mapfile) const
+ { mapfile->print_output_data(this, _("** group")); }
+
+ // Set final data size.
+ void
+ set_final_data_size()
+ { this->set_data_size((this->input_shndxes_.size() + 1) * 4); }
+
private:
// The input object.
Sized_relobj<size, big_endian>* relobj_;
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
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 total size of two output datas.
+ void
+ add_section_size(elfcpp::DT tag, const Output_data* od,
+ const Output_data* od2)
+ { this->add_entry(Dynamic_entry(tag, od, od2)); }
+
// Add a new dynamic entry with the address of a symbol.
void
add_symbol(elfcpp::DT tag, const Symbol* sym)
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
offset_(section_size
? DYNAMIC_SECTION_SIZE
: DYNAMIC_SECTION_ADDRESS)
- { this->u_.od = od; }
+ {
+ this->u_.od = od;
+ this->od2 = NULL;
+ }
+
+ // Create an entry with the size of two sections.
+ Dynamic_entry(elfcpp::DT tag, const Output_data* od, const Output_data* od2)
+ : tag_(tag),
+ offset_(DYNAMIC_SECTION_SIZE)
+ {
+ this->u_.od = od;
+ this->od2 = od2;
+ }
// 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_(DYNAMIC_STRING)
{ this->u_.str = str; }
+ // Return the tag of this entry.
+ elfcpp::DT
+ tag() const
+ { return this->tag_; }
+
// Write the dynamic entry to an output view.
template<int size, bool big_endian>
void
// For DYNAMIC_STRING.
const char* str;
} u_;
+ // For DYNAMIC_SYMBOL with two sections.
+ const Output_data* od2;
// The dynamic tag.
elfcpp::DT tag_;
// The type of entry (Classification) or offset within a section.
{
public:
Output_symtab_xindex(size_t symcount)
- : Output_section_data(symcount * 4, 4),
+ : Output_section_data(symcount * 4, 4, true),
entries_()
{ }
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
Xindex_entries entries_;
};
+// A relaxed input section.
+class Output_relaxed_input_section : public Output_section_data_build
+{
+ public:
+ // We would like to call relobj->section_addralign(shndx) to get the
+ // alignment but we do not want the constructor to fail. So callers
+ // are repsonsible for ensuring that.
+ Output_relaxed_input_section(Relobj* relobj, unsigned int shndx,
+ uint64_t addralign)
+ : Output_section_data_build(addralign), relobj_(relobj), shndx_(shndx)
+ { }
+
+ // Return the Relobj of this relaxed input section.
+ Relobj*
+ relobj() const
+ { return this->relobj_; }
+
+ // Return the section index of this relaxed input section.
+ unsigned int
+ shndx() const
+ { return this->shndx_; }
+
+ private:
+ Relobj* relobj_;
+ unsigned int shndx_;
+};
+
// 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.
// 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
+ // which applies to this section, or 0 if none, or -1 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
void
add_output_section_data(Output_section_data* posd);
+ // Add a relaxed input section PORIS to this output section.
+ void
+ add_relaxed_input_section(Output_relaxed_input_section* poris);
+
// Return the section name.
const char*
name() const
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));
- }
+ update_flags_for_input_section(elfcpp::Elf_Xword flags);
// Return the entsize field.
uint64_t
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; }
+
+ // Record that this section does not hold relro data.
+ void
+ clear_is_relro()
+ { this->is_relro_ = false; }
+
+ // 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; }
+
+ // True if this must be the last relro section.
+ bool
+ is_last_relro() const
+ { return this->is_last_relro_; }
+
+ // Record that this must be the last relro section.
+ void
+ set_is_last_relro()
+ {
+ gold_assert(this->is_relro_);
+ this->is_last_relro_ = true;
+ }
+
+ // True if this must be the first section following the relro sections.
+ bool
+ is_first_non_relro() const
+ {
+ gold_assert(!this->is_relro_);
+ return this->is_first_non_relro_;
+ }
+
+ // Record that this must be the first non-relro section.
+ void
+ set_is_first_non_relro()
+ {
+ gold_assert(!this->is_relro_);
+ this->is_first_non_relro_ = true;
+ }
+
+ // True if this is a small section: a section which holds small
+ // variables.
+ bool
+ is_small_section() const
+ { return this->is_small_section_; }
+
+ // Record that this is a small section.
+ void
+ set_is_small_section()
+ { this->is_small_section_ = true; }
+
+ // True if this is a large section: a section which holds large
+ // variables.
+ bool
+ is_large_section() const
+ { return this->is_large_section_; }
+
+ // Record that this is a large section.
+ void
+ set_is_large_section()
+ { this->is_large_section_ = true; }
+
+ // True if this is a large data (not BSS) section.
+ bool
+ is_large_data_section()
+ { return this->is_large_section_ && this->type_ != elfcpp::SHT_NOBITS; }
+
+ // True if this is the .interp section which goes into the PT_INTERP
+ // segment.
+ bool
+ is_interp() const
+ { return this->is_interp_; }
+
+ // Record that this is the interp section.
+ void
+ set_is_interp()
+ { this->is_interp_ = true; }
+
+ // True if this is a section used by the dynamic linker.
+ bool
+ is_dynamic_linker_section() const
+ { return this->is_dynamic_linker_section_; }
+
+ // Record that this is a section used by the dynamic linker.
+ void
+ set_is_dynamic_linker_section()
+ { this->is_dynamic_linker_section_ = true; }
+
// Return whether this section should be written after all the input
// sections are complete.
bool
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;
+ // Look for the merged section for input section SHNDX in object
+ // OBJECT. If found, return true, and set *ADDR to the address of
+ // the start of the merged section. This is not necessary the
+ // output offset corresponding to input offset 0 in the section,
+ // since the section may be mapped arbitrarily.
+ bool
+ find_starting_output_address(const Relobj* object, unsigned int shndx,
+ uint64_t* addr) const;
// Record that this output section was found in the SECTIONS clause
// of a linker script.
// The next few calls are for linker script support.
+ // We need to export the input sections to linker scripts. Previously
+ // we export a pair of Relobj pointer and section index. We now need to
+ // handle relaxed input sections as well. So we use this class.
+ class Simple_input_section
+ {
+ private:
+ static const unsigned int invalid_shndx = static_cast<unsigned int>(-1);
+
+ public:
+ Simple_input_section(Relobj *relobj, unsigned int shndx)
+ : shndx_(shndx)
+ {
+ gold_assert(shndx != invalid_shndx);
+ this->u_.relobj = relobj;
+ }
+
+ Simple_input_section(Output_relaxed_input_section* section)
+ : shndx_(invalid_shndx)
+ { this->u_.relaxed_input_section = section; }
+
+ // Whether this is a relaxed section.
+ bool
+ is_relaxed_input_section() const
+ { return this->shndx_ == invalid_shndx; }
+
+ // Return object of an input section.
+ Relobj*
+ relobj() const
+ {
+ return ((this->shndx_ != invalid_shndx)
+ ? this->u_.relobj
+ : this->u_.relaxed_input_section->relobj());
+ }
+
+ // Return index of an input section.
+ unsigned int
+ shndx() const
+ {
+ return ((this->shndx_ != invalid_shndx)
+ ? this->shndx_
+ : this->u_.relaxed_input_section->shndx());
+ }
+
+ // Return the Output_relaxed_input_section object of a relaxed section.
+ Output_relaxed_input_section*
+ relaxed_input_section() const
+ {
+ gold_assert(this->shndx_ == invalid_shndx);
+ return this->u_.relaxed_input_section;
+ }
+
+ private:
+ // Pointer to either an Relobj or an Output_relaxed_input_section.
+ union
+ {
+ Relobj* relobj;
+ Output_relaxed_input_section* relaxed_input_section;
+ } u_;
+ // Section index for an non-relaxed section or invalid_shndx for
+ // a relaxed section.
+ unsigned int shndx_;
+ };
+
// 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
// 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 > >*);
+ std::list<Simple_input_section>*);
- // Add an input section from a script.
+ // Add a simple input section.
void
- add_input_section_for_script(Relobj* object, unsigned int shndx,
- off_t data_size, uint64_t addralign);
+ add_simple_input_section(const Simple_input_section& input_section,
+ off_t data_size, uint64_t addralign);
// Set the current size of the output section.
void
// End of linker script support.
+ // Save states before doing section layout.
+ // This is used for relaxation.
+ void
+ save_states();
+
+ // Restore states prior to section layout.
+ void
+ restore_states();
+
+ // Discard states.
+ void
+ discard_states();
+
+ // Convert existing input sections to relaxed input sections.
+ void
+ convert_input_sections_to_relaxed_sections(
+ const std::vector<Output_relaxed_input_section*>& sections);
+
+ // Find a relaxed input section to an input section in OBJECT
+ // with index SHNDX. Return NULL if none is found.
+ const Output_relaxed_input_section*
+ find_relaxed_input_section(const Relobj* object, unsigned int shndx) const;
+
+ // Whether section offsets need adjustment due to relaxation.
+ bool
+ section_offsets_need_adjustment() const
+ { return this->section_offsets_need_adjustment_; }
+
+ // Set section_offsets_need_adjustment to be true.
+ void
+ set_section_offsets_need_adjustment()
+ { this->section_offsets_need_adjustment_ = true; }
+
+ // Adjust section offsets of input sections in this. This is
+ // requires if relaxation caused some input sections to change sizes.
+ void
+ adjust_section_offsets();
+
// Print merge statistics to stderr.
void
print_merge_stats();
do_output_section()
{ return this; }
+ const Output_section*
+ do_output_section() const
+ { return this; }
+
// Return the section index in the output file.
unsigned int
do_out_shndx() const
void
do_reset_address_and_file_offset();
+ // Return true if address and file offset already have reset values. In
+ // other words, calling reset_address_and_file_offset will not change them.
+ bool
+ do_address_and_file_offset_have_reset_values() const;
+
// 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
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
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
{
gold_assert(shndx != OUTPUT_SECTION_CODE
&& shndx != MERGE_DATA_SECTION_CODE
- && shndx != MERGE_STRING_SECTION_CODE);
+ && shndx != MERGE_STRING_SECTION_CODE
+ && shndx != RELAXED_INPUT_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_(ffsll(static_cast<long long>(posd->addralign())))
+ : shndx_(OUTPUT_SECTION_CODE), p2align_(0)
{
this->u1_.data_size = 0;
this->u2_.posd = posd;
: shndx_(is_string
? MERGE_STRING_SECTION_CODE
: MERGE_DATA_SECTION_CODE),
- p2align_(ffsll(static_cast<long long>(posd->addralign())))
+ p2align_(0)
{
this->u1_.entsize = entsize;
this->u2_.posd = posd;
}
+ // For a relaxed input section.
+ Input_section(Output_relaxed_input_section *psection)
+ : shndx_(RELAXED_INPUT_SECTION_CODE), p2align_(0)
+ {
+ this->u1_.data_size = 0;
+ this->u2_.poris = psection;
+ }
+
// 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 (this->shndx_ != OUTPUT_SECTION_CODE
&& this->shndx_ != MERGE_DATA_SECTION_CODE
- && this->shndx_ != MERGE_STRING_SECTION_CODE);
+ && this->shndx_ != MERGE_STRING_SECTION_CODE
+ && this->shndx_ != RELAXED_INPUT_SECTION_CODE);
}
// Return whether this is a merge section which matches the
&& this->addralign() == addralign);
}
+ // Return whether this is a relaxed input section.
+ bool
+ is_relaxed_input_section() const
+ { return this->shndx_ == RELAXED_INPUT_SECTION_CODE; }
+
+ // Return whether this is a generic Output_section_data.
+ bool
+ is_output_section_data() const
+ {
+ return this->shndx_ == OUTPUT_SECTION_CODE;
+ }
+
// Return the object for an input section.
Relobj*
relobj() const
{
- gold_assert(this->is_input_section());
- return this->u2_.object;
+ if (this->is_input_section())
+ return this->u2_.object;
+ else if (this->is_relaxed_input_section())
+ return this->u2_.poris->relobj();
+ else
+ gold_unreachable();
}
// Return the input section index for an input section.
unsigned int
shndx() const
{
- gold_assert(this->is_input_section());
- return this->shndx_;
+ if (this->is_input_section())
+ return this->shndx_;
+ else if (this->is_relaxed_input_section())
+ return this->u2_.poris->shndx();
+ else
+ gold_unreachable();
+ }
+
+ // For non-input-sections, return the associated Output_section_data
+ // object.
+ Output_section_data*
+ output_section_data() const
+ {
+ gold_assert(!this->is_input_section());
+ return this->u2_.posd;
+ }
+
+ // Return the Output_relaxed_input_section object.
+ Output_relaxed_input_section*
+ relaxed_input_section() const
+ {
+ gold_assert(this->is_relaxed_input_section());
+ return this->u2_.poris;
}
// Set the output section.
set_output_section(Output_section* os)
{
gold_assert(!this->is_input_section());
- this->u2_.posd->set_output_section(os);
+ Output_section_data *posd =
+ this->is_relaxed_input_section() ? this->u2_.poris : this->u2_.posd;
+ posd->set_output_section(os);
}
// Set the address and file offset. This is called during
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)
MERGE_DATA_SECTION_CODE = -2U,
// An Output_section_data for an SHF_MERGE section with
// SHF_STRINGS set.
- MERGE_STRING_SECTION_CODE = -3U
+ MERGE_STRING_SECTION_CODE = -3U,
+ // An Output_section_data for a relaxed input section.
+ RELAXED_INPUT_SECTION_CODE = -4U
};
// For an ordinary input section, this is the section index in the
{
// 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
+ // For OUTPUT_SECTION_CODE or RELAXED_INPUT_SECTION_CODE, this is not
+ // used. For MERGE_DATA_SECTION_CODE or MERGE_STRING_SECTION_CODE, the
// entity size.
uint64_t entsize;
} u1_;
// For OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
// MERGE_STRING_SECTION_CODE, the data.
Output_section_data* posd;
+ // For RELAXED_INPUT_SECTION_CODE, the data.
+ Output_relaxed_input_section* poris;
} u2_;
};
typedef std::vector<Input_section> Input_section_list;
+ // Allow a child class to access the input sections.
+ const Input_section_list&
+ input_sections() const
+ { return this->input_sections_; }
+
+ private:
+ // We only save enough information to undo the effects of section layout.
+ class Checkpoint_output_section
+ {
+ public:
+ Checkpoint_output_section(uint64_t addralign, elfcpp::Elf_Xword flags,
+ const Input_section_list& input_sections,
+ off_t first_input_offset,
+ bool attached_input_sections_are_sorted)
+ : addralign_(addralign), flags_(flags),
+ input_sections_(input_sections),
+ input_sections_size_(input_sections_.size()),
+ input_sections_copy_(), first_input_offset_(first_input_offset),
+ attached_input_sections_are_sorted_(attached_input_sections_are_sorted)
+ { }
+
+ virtual
+ ~Checkpoint_output_section()
+ { }
+
+ // Return the address alignment.
+ uint64_t
+ addralign() const
+ { return this->addralign_; }
+
+ // Return the section flags.
+ elfcpp::Elf_Xword
+ flags() const
+ { return this->flags_; }
+
+ // Return a reference to the input section list copy.
+ Input_section_list*
+ input_sections()
+ { return &this->input_sections_copy_; }
+
+ // Return the size of input_sections at the time when checkpoint is
+ // taken.
+ size_t
+ input_sections_size() const
+ { return this->input_sections_size_; }
+
+ // Whether input sections are copied.
+ bool
+ input_sections_saved() const
+ { return this->input_sections_copy_.size() == this->input_sections_size_; }
+
+ off_t
+ first_input_offset() const
+ { return this->first_input_offset_; }
+
+ bool
+ attached_input_sections_are_sorted() const
+ { return this->attached_input_sections_are_sorted_; }
+
+ // Save input sections.
+ void
+ save_input_sections()
+ {
+ this->input_sections_copy_.reserve(this->input_sections_size_);
+ this->input_sections_copy_.clear();
+ Input_section_list::const_iterator p = this->input_sections_.begin();
+ gold_assert(this->input_sections_size_ >= this->input_sections_.size());
+ for(size_t i = 0; i < this->input_sections_size_ ; i++, ++p)
+ this->input_sections_copy_.push_back(*p);
+ }
+
+ private:
+ // The section alignment.
+ uint64_t addralign_;
+ // The section flags.
+ elfcpp::Elf_Xword flags_;
+ // Reference to the input sections to be checkpointed.
+ const Input_section_list& input_sections_;
+ // Size of the checkpointed portion of input_sections_;
+ size_t input_sections_size_;
+ // Copy of input sections.
+ Input_section_list input_sections_copy_;
+ // The offset of the first entry in input_sections_.
+ off_t first_input_offset_;
+ // True if the input sections attached to this output section have
+ // already been sorted.
+ bool attached_input_sections_are_sorted_;
+ };
+
// This class is used to sort the input sections.
class Input_section_sort_entry;
- // This is the sort comparison function.
+ // This is the sort comparison function for ctors and dtors.
struct Input_section_sort_compare
{
bool
const Input_section_sort_entry&) const;
};
+ // This is the sort comparison function for .init_array and .fini_array.
+ struct Input_section_sort_init_fini_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
typedef std::vector<Fill> Fill_list;
+ // This class describes properties of merge data sections. It is used
+ // as a key type for maps.
+ class Merge_section_properties
+ {
+ public:
+ Merge_section_properties(bool is_string, uint64_t entsize,
+ uint64_t addralign)
+ : is_string_(is_string), entsize_(entsize), addralign_(addralign)
+ { }
+
+ // Whether this equals to another Merge_section_properties MSP.
+ bool
+ eq(const Merge_section_properties& msp) const
+ {
+ return ((this->is_string_ == msp.is_string_)
+ && (this->entsize_ == msp.entsize_)
+ && (this->addralign_ == msp.addralign_));
+ }
+
+ // Compute a hash value for this using 64-bit FNV-1a hash.
+ size_t
+ hash_value() const
+ {
+ uint64_t h = 14695981039346656037ULL; // FNV offset basis.
+ uint64_t prime = 1099511628211ULL;
+ h = (h ^ static_cast<uint64_t>(this->is_string_)) * prime;
+ h = (h ^ static_cast<uint64_t>(this->entsize_)) * prime;
+ h = (h ^ static_cast<uint64_t>(this->addralign_)) * prime;
+ return h;
+ }
+
+ // Functors for associative containers.
+ struct equal_to
+ {
+ bool
+ operator()(const Merge_section_properties& msp1,
+ const Merge_section_properties& msp2) const
+ { return msp1.eq(msp2); }
+ };
+
+ struct hash
+ {
+ size_t
+ operator()(const Merge_section_properties& msp) const
+ { return msp.hash_value(); }
+ };
+
+ private:
+ // Whether this merge data section is for strings.
+ bool is_string_;
+ // Entsize of this merge data section.
+ uint64_t entsize_;
+ // Address alignment.
+ uint64_t addralign_;
+ };
+
+ // Map that link Merge_section_properties to Output_merge_base.
+ typedef Unordered_map<Merge_section_properties, Output_merge_base*,
+ Merge_section_properties::hash,
+ Merge_section_properties::equal_to>
+ Merge_section_by_properties_map;
+
+ // Map that link Const_section_id to Output_section_data.
+ typedef Unordered_map<Const_section_id, Output_section_data*,
+ Const_section_id_hash>
+ Output_section_data_by_input_section_map;
+
+ // Map that link Const_section_id to Output_relaxed_input_section.
+ typedef Unordered_map<Const_section_id, Output_relaxed_input_section*,
+ Const_section_id_hash>
+ Output_relaxed_input_section_by_input_section_map;
+
+ // Map used during relaxation of existing sections. This map
+ // a section id an input section list index. We assume that
+ // Input_section_list is a vector.
+ typedef Unordered_map<Section_id, size_t, Section_id_hash> Relaxation_map;
+
// Add a new output section by Input_section.
void
add_output_section_data(Input_section*);
void
sort_attached_input_sections();
+ // Find the merge section into which an input section with index SHNDX in
+ // OBJECT has been added. Return NULL if none found.
+ Output_section_data*
+ find_merge_section(const Relobj* object, unsigned int shndx) const;
+
+ // Build a relaxation map.
+ void
+ build_relaxation_map(
+ const Input_section_list& input_sections,
+ size_t limit,
+ Relaxation_map* map) const;
+
+ // Convert input sections in an input section list into relaxed sections.
+ void
+ convert_input_sections_in_list_to_relaxed_sections(
+ const std::vector<Output_relaxed_input_section*>& relaxed_sections,
+ const Relaxation_map& map,
+ Input_section_list* input_sections);
+
// Most of these fields are only valid after layout.
// The name of the section. This will point into a Stringpool.
// 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;
+ // True if this must be the last relro section.
+ bool is_last_relro_ : 1;
+ // True if this must be the first section after the relro sections.
+ bool is_first_non_relro_ : 1;
+ // True if this is a small section.
+ bool is_small_section_ : 1;
+ // True if this is a large section.
+ bool is_large_section_ : 1;
+ // True if this is the .interp section going into the PT_INTERP
+ // segment.
+ bool is_interp_ : 1;
+ // True if this is section is read by the dynamic linker.
+ bool is_dynamic_linker_section_ : 1;
+ // Whether code-fills are generated at write.
+ bool generate_code_fills_at_write_ : 1;
+ // Whether the entry size field should be zero.
+ bool is_entsize_zero_ : 1;
+ // Whether section offsets need adjustment due to relaxation.
+ bool section_offsets_need_adjustment_ : 1;
// For SHT_TLS sections, the offset of this section relative to the base
// of the TLS segment.
uint64_t tls_offset_;
+ // Saved checkpoint.
+ Checkpoint_output_section* checkpoint_;
+ // Map from input sections to merge sections.
+ Output_section_data_by_input_section_map merge_section_map_;
+ // Map from merge section properties to merge_sections;
+ Merge_section_by_properties_map merge_section_by_properties_map_;
+ // Map from input sections to relaxed input sections. This is mutable
+ // because it is updated lazily. We may need to update it in a
+ // const qualified method.
+ mutable Output_relaxed_input_section_by_input_section_map
+ relaxed_input_section_map_;
+ // Whether relaxed_input_section_map_ is valid.
+ mutable bool is_relaxed_input_section_map_valid_;
};
// 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.
+//
+// NOTE: We want to use the copy constructor for this class. During
+// relaxation, we may try built the segments multiple times. We do
+// that by copying the original segment list before lay-out, doing
+// a trial lay-out and roll-back to the saved copied if we need to
+// to the lay-out again.
class Output_segment
{
offset() const
{ return this->offset_; }
+ // Whether this is a segment created to hold large data sections.
+ bool
+ is_large_data_segment() const
+ { return this->is_large_data_segment_; }
+
+ // Record that this is a segment created to hold large data
+ // sections.
+ void
+ set_is_large_data_segment()
+ { this->is_large_data_segment_ = true; }
+
// 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)
- { this->add_output_section(os, seg_flags, false); }
-
- // Add an Output_section to the start of this segment.
+ // Add the Output_section OS to this segment. SEG_FLAGS is the
+ // segment flags to use. DO_SORT is true if we should sort the
+ // placement of the input section for more efficient generated code.
void
- add_initial_output_section(Output_section* os, elfcpp::Elf_Word seg_flags)
- { this->add_output_section(os, seg_flags, true); }
+ add_output_section(Output_section* os, elfcpp::Elf_Word seg_flags,
+ bool do_sort);
// 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.
+ // Add an Output_data (which need not be an Output_section) to the
+ // start of this segment.
void
add_initial_output_data(Output_data*);
this->are_addresses_set_ = true;
}
+ // Update the flags for the flags of an output section added to this
+ // segment.
+ void
+ update_flags_for_output_section(elfcpp::Elf_Xword flags)
+ {
+ // The ELF ABI specifies that a PT_TLS segment should always have
+ // PF_R as the flags.
+ if (this->type() != elfcpp::PT_TLS)
+ this->flags_ |= flags;
+ }
+
// Set the segment flags. This is only used if we have a PHDRS
// clause which explicitly specifies the flags.
void
// 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,
+ set_section_addresses(const Layout*, bool reset, uint64_t addr,
+ unsigned int increase_relro, off_t* poff,
unsigned int* pshndx);
// Set the minimum alignment of this segment. This may be adjusted
// 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_offset(unsigned int increase);
// Set the TLS offsets of the sections contained in the PT_TLS segment.
void
write_section_headers(const Layout*, const Stringpool*, unsigned char* v,
unsigned int* pshndx) const;
- private:
- Output_segment(const Output_segment&);
- Output_segment& operator=(const Output_segment&);
+ // Print the output sections in the map file.
+ void
+ print_sections_to_mapfile(Mapfile*) const;
+ private:
typedef std::list<Output_data*> Output_data_list;
- // Add an Output_section to this segment, specifying front or back.
- void
- add_output_section(Output_section*, elfcpp::Elf_Word seg_flags,
- bool front);
-
// 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*,
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;
+
+ // NOTE: We want to use the copy constructor. Currently, shallow copy
+ // works for us so we do not need to write our own copy constructor.
+
// 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.
bool is_max_align_known_ : 1;
// Whether vaddr and paddr were set by a linker script.
bool are_addresses_set_ : 1;
+ // Whether this segment holds large data sections.
+ bool is_large_data_segment_ : 1;
};
// This class represents the output file.
set_is_temporary()
{ this->is_temporary_ = true; }
+ // Try to open an existing file. Returns false if the file doesn't
+ // exist, has a size of 0 or can't be mmaped. This method is
+ // thread-unsafe.
+ bool
+ open_for_modification();
+
// Open the output file. FILE_SIZE is the final size of the file.
+ // If the file already exists, it is deleted/truncated. This method
+ // is thread-unsafe.
void
open(off_t file_size);
- // Resize the output file.
+ // Resize the output file. This method is thread-unsafe.
void
resize(off_t file_size);
// Close the output file (flushing all buffered data) and make sure
- // there are no errors.
+ // there are no errors. This method is thread-unsafe.
void
close();
+ // Return the size of this file.
+ off_t
+ filesize()
+ { return this->file_size_; }
+
+ // Return the name of this file.
+ const char*
+ filename()
+ { return this->name_; }
+
// We currently always use mmap which makes the view handling quite
// simple. In the future we may support other approaches.
{ }
private:
- // Map the file into memory and return a pointer to the map.
+ // Map the file into memory or, if that fails, allocate anonymous
+ // memory.
void
map();
+ // Allocate anonymous memory for the file.
+ bool
+ map_anonymous();
+
+ // Map the file into memory.
+ bool
+ map_no_anonymous();
+
// Unmap the file from memory (and flush to disk buffers).
void
unmap();