// output.h -- manage the output file for gold -*- C++ -*-
-// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#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;
template<int size, bool big_endian>
class Sized_target;
template<int size, bool big_endian>
class Sized_relobj;
+template<int size, bool big_endian>
+class Sized_relobj_file;
// An abtract class for data which has to go into the output file.
class Output_data
{
public:
- explicit Output_data(off_t data_size = 0)
- : address_(0), data_size_(data_size), offset_(-1)
+ explicit Output_data()
+ : address_(0), data_size_(0), offset_(-1),
+ is_address_valid_(false), is_data_size_valid_(false),
+ is_offset_valid_(false), is_data_size_fixed_(false),
+ has_dynamic_reloc_(false)
{ }
virtual
~Output_data();
- // Return the address. This is only valid after Layout::finalize is
- // finished.
+ // Return the address. For allocated sections, this is only valid
+ // after Layout::finalize is finished.
uint64_t
address() const
- { return this->address_; }
+ {
+ gold_assert(this->is_address_valid_);
+ return this->address_;
+ }
- // Return the size of the data. This must be valid after
- // Layout::finalize calls set_address, but need not be valid before
- // then.
+ // 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
- { return this->data_size_; }
+ {
+ gold_assert(this->is_data_size_valid_);
+ return this->data_size_;
+ }
+
+ // Get the current data size.
+ off_t
+ current_data_size() const
+ { return this->current_data_size_for_child(); }
+ // 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.
+ // 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
- { return this->offset_; }
+ {
+ 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;
+ 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
{ 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
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(); }
+
+ 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
set_out_shndx(unsigned int shndx)
{ this->do_set_out_shndx(shndx); }
- // Set the address and file offset of this data. This is called
- // during Layout::finalize.
+ // 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;
+ }
+
+ // Update the data size without finalizing it.
+ void
+ pre_finalize_data_size()
+ {
+ if (!this->is_data_size_valid_)
+ {
+ // Tell the child class to update the data size.
+ this->update_data_size();
+ }
+ }
+
+ // 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_address(uint64_t addr, off_t off);
+ 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.
write(Output_file* file)
{ this->do_write(file); }
- // This is called by Layout::finalize to note that all sizes must
- // now be fixed.
+ // This is called by Layout::finalize to note that the sizes of
+ // allocated sections must now be fixed.
static void
layout_complete()
- { Output_data::sizes_are_fixed = true; }
+ { Output_data::allocated_sizes_are_fixed = true; }
// Used to check that layout has been done.
static bool
is_layout_complete()
- { return Output_data::sizes_are_fixed; }
+ { return Output_data::allocated_sizes_are_fixed; }
+
+ // Note that a dynamic reloc has been applied to this data.
+ void
+ add_dynamic_reloc()
+ { this->has_dynamic_reloc_ = true; }
+
+ // Return whether a dynamic reloc has been applied.
+ bool
+ has_dynamic_reloc() const
+ { return this->has_dynamic_reloc_; }
+
+ // 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.
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
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; }
+
+ 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_set_out_shndx(unsigned int)
{ gold_unreachable(); }
- // Set the address and file offset of the data. This only needs to
- // be implemented if the child needs to know. The child class can
- // set its size in this call.
+ // This is a hook for derived classes to set the preliminary data size.
+ // This is called by pre_finalize_data_size, normally called during
+ // Layout::finalize, before the section address is set, and is used
+ // during an incremental update, when we need to know the size of a
+ // section before allocating space in the output file. For classes
+ // where the current data size is up to date, this default version of
+ // the method can be inherited.
+ virtual void
+ update_data_size()
+ { }
+
+ // 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_set_address(uint64_t, off_t)
+ 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)
+ { 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.
+ // 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(!Output_data::sizes_are_fixed);
+ 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
+ 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;
}
Output_data& operator=(const Output_data&);
// This is used for verification, to make sure that we don't try to
- // change any sizes after we set the section addresses.
- static bool sizes_are_fixed;
+ // change any sizes of allocated sections after we set the section
+ // addresses.
+ static bool allocated_sizes_are_fixed;
- // Memory address in file (not always meaningful).
+ // Memory address in output file.
uint64_t address_;
- // Size of data in file.
+ // Size of data in output file.
off_t data_size_;
- // Offset within file.
+ // File offset of contents in output file.
off_t offset_;
+ // Whether address_ is valid.
+ bool is_address_valid_ : 1;
+ // Whether data_size_ is valid.
+ bool is_data_size_valid_ : 1;
+ // Whether offset_ is valid.
+ bool is_offset_valid_ : 1;
+ // Whether data size is fixed.
+ bool is_data_size_fixed_ : 1;
+ // Whether any dynamic relocs have been applied to this section.
+ bool has_dynamic_reloc_ : 1;
};
// Output the section headers.
Output_section_headers(const Layout*,
const Layout::Segment_list*,
const Layout::Section_list*,
- const Stringpool*);
+ const Layout::Section_list*,
+ const Stringpool*,
+ const Output_section*);
+ protected:
// Write the data to the file.
void
do_write(Output_file*);
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")); }
+
+ // Update the data size.
+ void
+ update_data_size()
+ { this->set_data_size(this->do_size()); }
+
+ // 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_;
const Layout::Section_list* unattached_section_list_;
const Stringpool* secnamepool_;
+ const Output_section* shstrtab_section_;
};
// Output the segment headers.
public:
Output_segment_headers(const Layout::Segment_list& segment_list);
+ protected:
// Write the data to the file.
void
do_write(Output_file*);
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_;
};
public:
Output_file_header(const Target*,
const Symbol_table*,
- const Output_segment_headers*);
+ 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*);
do_addralign() const
{ return Output_data::default_alignment(); }
- // Set the address and offset--we only implement this for error
- // checking.
+ // 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
- do_set_address(uint64_t, off_t off) const
- { gold_assert(off == 0); }
+ 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.
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();
+
+ // Compute the current data size.
+ off_t
+ do_size() const;
+
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,
class Output_section_data : public Output_data
{
public:
- Output_section_data(off_t data_size, uint64_t addralign)
- : Output_data(data_size), output_section_(NULL), addralign_(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);
+ if (is_data_size_fixed)
+ this->fix_data_size();
+ }
Output_section_data(uint64_t addralign)
- : Output_data(0), output_section_(NULL), addralign_(addralign)
+ : Output_data(), output_section_(NULL), addralign_(addralign)
{ }
// Return the output section.
+ Output_section*
+ output_section()
+ { return this->output_section_; }
+
const Output_section*
output_section() const
{ return this->output_section_; }
// 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.
- virtual bool
- output_offset(const Relobj* object, unsigned int shndx, off_t offset,
- off_t *poutput) const
+ 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 output_offset.
virtual bool
- do_output_offset(const Relobj*, unsigned int, off_t, off_t*) const
+ 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_; }
+
+ 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;
// Set the alignment.
void
- set_addralign(uint64_t addralign)
- { this->addralign_ = addralign; }
+ set_addralign(uint64_t addralign);
private:
// The output section for this section.
- const Output_section* output_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)
+ { }
+
+ Output_section_data_build(off_t data_size, uint64_t addralign)
+ : Output_section_data(data_size, addralign, false)
+ { }
+
+ // 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.
{
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)
{ }
- // Add more data.
- void
- add_data(const std::string& add)
- {
- this->data_.append(add);
- this->set_data_size(this->data_.size());
- }
-
+ 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_;
};
{
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:
// 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 data written out via some other mechanism.
+// A place holder for a fixed amount of data written out via some
+// other mechanism.
-class Output_data_space : public Output_section_data
+class Output_data_fixed_space : public Output_section_data
{
public:
- Output_data_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)
{ }
- explicit Output_data_space(uint64_t addralign)
- : Output_section_data(addralign)
+ protected:
+ // Write out the data--the actual data must be written out
+ // elsewhere.
+ void
+ do_write(Output_file*)
{ }
- // Set the size.
+ // Write to a map file.
void
- set_space_size(off_t space_size)
- { this->set_data_size(space_size); }
+ 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)
+ { }
+
+ explicit Output_data_space(off_t data_size, uint64_t addralign,
+ const char* map_name)
+ : Output_section_data_build(data_size, addralign),
+ map_name_(map_name)
+ { }
// Set the alignment.
void
set_space_alignment(uint64_t align)
{ this->set_addralign(align); }
- // Write out the data--this must be handled elsewhere.
+ 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, 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.
: Output_section_data(1), strtab_(strtab)
{ }
+ protected:
+ // This is called to update the section size prior to assigning
+ // the address and file offset.
+ void
+ update_data_size()
+ { this->set_final_data_size(); }
+
// This is called to set the address and file offset. Here we make
// sure that the Stringpool is finalized.
void
- do_set_address(uint64_t, off_t);
+ 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_;
};
// 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, an
-// output section, or the undefined symbol at index 0. We represent
-// the latter by using a NULL global symbol.
+// 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;
{
public:
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.
: 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)
- : address_(address), local_sym_index_(GSYM_CODE), type_(type),
- shndx_(INVALID_CODE)
- {
- this->u1_.gsym = gsym;
- this->u2_.od = od;
- }
+ Address address, bool is_relative, bool is_symbolless);
- Output_reloc(Symbol* gsym, unsigned int type, Relobj* relobj,
- unsigned int shndx, Address address)
- : address_(address), local_sym_index_(GSYM_CODE), type_(type),
- shndx_(shndx)
- {
- gold_assert(shndx != INVALID_CODE);
- this->u1_.gsym = gsym;
- this->u2_.relobj = relobj;
- }
+ 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.
+ // 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)
- : address_(address), local_sym_index_(local_sym_index), type_(type),
- shndx_(INVALID_CODE)
- {
- gold_assert(local_sym_index != GSYM_CODE
- && local_sym_index != INVALID_CODE);
- this->u1_.relobj = relobj;
- this->u2_.od = od;
- }
+ unsigned int local_sym_index, unsigned int type,
+ Output_data* od, Address address, bool is_relative,
+ 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)
- : address_(address), local_sym_index_(local_sym_index), type_(type),
- shndx_(shndx)
- {
- gold_assert(local_sym_index != GSYM_CODE
- && local_sym_index != INVALID_CODE);
- gold_assert(shndx != INVALID_CODE);
- this->u1_.relobj = relobj;
- this->u2_.relobj = relobj;
- }
+ unsigned int local_sym_index, unsigned int type,
+ unsigned int shndx, Address address, bool is_relative,
+ 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)
- : address_(address), local_sym_index_(SECTION_CODE), type_(type),
- shndx_(INVALID_CODE)
+ Address address);
+
+ 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 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
{
- this->u1_.os = os;
- this->u2_.od = od;
+ 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_);
}
- Output_reloc(Output_section* os, unsigned int type, Relobj* relobj,
- unsigned int shndx, Address address)
- : address_(address), local_sym_index_(SECTION_CODE), type_(type),
- shndx_(shndx)
+ // 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.
+ Address
+ 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;
+
+ // If this relocation is against an input section, return the
+ // relocatable object containing the input section.
+ Sized_relobj<size, big_endian>*
+ get_relobj() const
{
- gold_assert(shndx != INVALID_CODE);
- this->u1_.os = os;
- this->u2_.relobj = relobj;
+ if (this->shndx_ == INVALID_CODE)
+ return NULL;
+ return this->u2_.relobj;
}
// Write the reloc entry to an output view.
template<typename Write_rel>
void write_rel(Write_rel*) const;
- private:
- // Return the symbol index. We can't do a double template
- // specialization, so we do a secondary template here.
- unsigned int
+ // 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
{
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 local symbol, 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.
+ // 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, the symbol. If this is NULL, it indicates
- // a relocation against the undefined 0 symbol.
+ // 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, the output section.
+ // 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 shndx_ is not INVALID CODE, the object which holds the input
- // section being used to specify the reloc address.
- Relobj* relobj;
- // If shndx_ is INVALID_CODE, the output data being used to
+ // If this->shndx_ is not INVALID CODE, the object which holds the
+ // input section being used to specify the reloc address.
+ 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.
Output_data* od;
} u2_;
// The address offset within the input section or the Output_data.
Address address_;
- // For a local symbol, the local symbol index. This is GSYM_CODE
- // for a global symbol, or INVALID_CODE for an uninitialized value.
+ // This is GSYM_CODE for a global symbol, or SECTION_CODE for a
+ // 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_;
+ 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
// section index. This is INVALID_CODE if the reloc address is
// specified in some other way.
// A reloc against a global symbol.
Output_reloc(Symbol* gsym, unsigned int type, Output_data* od,
- Address address, Addend addend)
- : rel_(gsym, type, od, address), 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,
- unsigned int shndx, Address address, Addend addend)
- : rel_(gsym, type, relobj, shndx, address), addend_(addend)
+ Output_reloc(Symbol* gsym, unsigned int type,
+ Sized_relobj<size, big_endian>* relobj,
+ unsigned int shndx, Address address, 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)
- : rel_(relobj, local_sym_index, type, od, address), addend_(addend)
+ unsigned int local_sym_index, unsigned int type,
+ Output_data* od, Address address,
+ Addend addend, bool is_relative,
+ bool is_symbolless, bool is_section_symbol)
+ : rel_(relobj, local_sym_index, type, od, address, is_relative,
+ 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)
- : rel_(relobj, local_sym_index, type, shndx, address),
+ unsigned int local_sym_index, unsigned int type,
+ unsigned int shndx, Address address,
+ Addend addend, bool is_relative,
+ bool is_symbolless, bool is_section_symbol)
+ : rel_(relobj, local_sym_index, type, shndx, address, is_relative,
+ 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(); }
+
+ // If this relocation is against an input section, return the
+ // relocatable object containing the input section.
+ Sized_relobj<size, big_endian>*
+ get_relobj() const
+ { return this->rel_.get_relobj(); }
+
// 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_;
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
+class Output_data_reloc_base : public Output_data_reloc_generic
{
public:
typedef Output_reloc<sh_type, dynamic, size, big_endian> Output_reloc_type;
Reloc_types<sh_type, size, big_endian>::reloc_size;
// Construct the section.
- Output_data_reloc_base()
- : Output_section_data(Output_data::default_alignment_for_size(size))
+ Output_data_reloc_base(bool sort_relocs)
+ : Output_data_reloc_generic(size, sort_relocs)
{ }
+ protected:
// Write out the data.
void
do_write(Output_file*);
- protected:
// Set the entry size and the link.
void
- do_adjust_output_section(Output_section *os);
+ 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(const Output_reloc_type& reloc)
+ add(Output_data* od, const Output_reloc_type& reloc)
{
this->relocs_.push_back(reloc);
- this->set_data_size(this->relocs_.size() * reloc_size);
+ this->set_current_data_size(this->relocs_.size() * reloc_size);
+ od->add_dynamic_reloc();
+ if (reloc.is_relative())
+ this->bump_relative_reloc_count();
+ Sized_relobj<size, big_endian>* relobj = reloc.get_relobj();
+ if (relobj != NULL)
+ relobj->add_dyn_reloc(this->relocs_.size() - 1);
}
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_;
};
class Output_data_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>
: public Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>
{
- private:
+ private:
typedef Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size,
big_endian> Base;
typedef typename Base::Output_reloc_type Output_reloc_type;
typedef typename Output_reloc_type::Address Address;
- Output_data_reloc()
- : Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>()
+ 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(Output_reloc_type(gsym, type, od, address)); }
+ { this->add(od, Output_reloc_type(gsym, type, od, address, false, false)); }
void
- add_global(Symbol* gsym, unsigned int type, 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(Output_reloc_type(gsym, type, relobj, shndx, address)); }
+ { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
+ false, 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,
+ Sized_relobj<size, big_endian>* 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, true)); }
+
+ void
+ add_global_relative(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, 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,
+ false, true));
+ }
// Add a reloc against a local symbol.
add_local(Sized_relobj<size, big_endian>* relobj,
unsigned int local_sym_index, unsigned int type,
Output_data* od, Address address)
- { this->add(Output_reloc_type(relobj, local_sym_index, type, od, address)); }
+ {
+ this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
+ address, false, false, false));
+ }
void
add_local(Sized_relobj<size, big_endian>* relobj,
unsigned int local_sym_index, unsigned int type,
- unsigned int shndx, Address address)
- { this->add(Output_reloc_type(relobj, local_sym_index, type, shndx,
- address)); }
+ Output_data* od, unsigned int shndx, Address address)
+ {
+ this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
+ address, false, 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, 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, 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
+ // 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, 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, 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(Output_reloc_type(os, type, od, address)); }
+ { this->add(od, Output_reloc_type(os, type, od, address)); }
void
- add_output_section(Output_section* os, unsigned int type,
- Relobj* relobj, unsigned int shndx, Address address)
- { this->add(Output_reloc_type(os, type, relobj, shndx, address)); }
+ add_output_section(Output_section* os, unsigned int type, Output_data* od,
+ 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.
class Output_data_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>
: public Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>
{
- private:
+ private:
typedef Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size,
big_endian> Base;
typedef typename Output_reloc_type::Address Address;
typedef typename Output_reloc_type::Addend Addend;
- Output_data_reloc()
- : Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>()
+ 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(Output_reloc_type(gsym, type, od, address, addend)); }
+ { this->add(od, Output_reloc_type(gsym, type, od, address, addend,
+ false, false)); }
+
+ void
+ 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, 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,
+ true)); }
void
- add_global(Symbol* gsym, unsigned int type, Relobj* relobj,
- unsigned int shndx, Address address, Addend addend)
- { this->add(Output_reloc_type(gsym, type, relobj, shndx, address, addend)); }
+ add_global_relative(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, 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, false, true)); }
// Add a reloc against a local symbol.
unsigned int local_sym_index, unsigned int type,
Output_data* od, Address address, Addend addend)
{
- this->add(Output_reloc_type(relobj, local_sym_index, type, od, address,
- addend));
+ this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
+ addend, false, false, false));
}
void
add_local(Sized_relobj<size, big_endian>* relobj,
unsigned int local_sym_index, unsigned int type,
- unsigned int shndx, Address address, Addend addend)
+ 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, 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, 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(Output_reloc_type(relobj, local_sym_index, type, shndx, address,
- addend));
+ this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
+ 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
+ // 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, 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, 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(Output_reloc_type(os, type, od, address, addend)); }
+ { this->add(od, 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, Output_data* od,
+ Sized_relobj<size, big_endian>* relobj,
unsigned int shndx, Address address, Addend addend)
- { this->add(Output_reloc_type(os, type, relobj, shndx, address, addend)); }
+ { this->add(od, 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
+// 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_file<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")); }
+
+ // 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_file<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
// needed.
template<int size, bool big_endian>
-class Output_data_got : public Output_section_data
+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(Output_data::default_alignment_for_size(size)),
- entries_()
+ : Output_section_data_build(Output_data::default_alignment_for_size(size)),
+ entries_(), free_list_()
{ }
+ Output_data_got(off_t data_size)
+ : Output_section_data_build(data_size,
+ Output_data::default_alignment_for_size(size)),
+ entries_(), free_list_()
+ {
+ // For an incremental update, we have an existing GOT section.
+ // Initialize the list of entries and the free list.
+ this->entries_.resize(data_size / (size / 8));
+ this->free_list_.init(data_size, false);
+ }
+
// 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);
+ add_global(Symbol* gsym, unsigned int got_type);
+
+ // Like add_global, but use the PLT offset of the global symbol if
+ // it has one.
+ bool
+ add_global_plt(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);
+ add_local(Sized_relobj_file<size, big_endian>* object, unsigned int sym_index,
+ unsigned int got_type);
+
+ // Like add_local, but use the PLT offset of the local symbol if it
+ // has one.
+ bool
+ add_local_plt(Sized_relobj_file<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_file<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_file<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_file<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_file<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();
+ unsigned int got_offset = this->add_got_entry(Got_entry(constant));
+ return got_offset;
}
+ // Reserve a slot in the GOT.
+ void
+ reserve_slot(unsigned int i)
+ { this->free_list_.remove(i * size / 8, (i + 1) * size / 8); }
+
+ // Reserve a slot in the GOT for a local symbol.
+ void
+ reserve_local(unsigned int i, Sized_relobj<size, big_endian>* object,
+ unsigned int sym_index, unsigned int got_type);
+
+ // Reserve a slot in the GOT for a global symbol.
+ void
+ reserve_global(unsigned int i, Symbol* gsym, unsigned int got_type);
+
+ 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)
+ : local_sym_index_(RESERVED_CODE), use_plt_offset_(false)
{ this->u_.constant = 0; }
// Create a global symbol entry.
- explicit Got_entry(Symbol* gsym)
- : local_sym_index_(GSYM_CODE)
+ Got_entry(Symbol* gsym, bool use_plt_offset)
+ : local_sym_index_(GSYM_CODE), use_plt_offset_(use_plt_offset)
{ 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)
+ Got_entry(Sized_relobj_file<size, big_endian>* object,
+ unsigned int local_sym_index, bool use_plt_offset)
+ : local_sym_index_(local_sym_index), use_plt_offset_(use_plt_offset)
{
gold_assert(local_sym_index != GSYM_CODE
- && local_sym_index != CONSTANT_CODE);
+ && local_sym_index != CONSTANT_CODE
+ && local_sym_index != RESERVED_CODE
+ && local_sym_index == this->local_sym_index_);
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)
+ : local_sym_index_(CONSTANT_CODE), use_plt_offset_(false)
{ this->u_.constant = constant; }
// Write the GOT entry to an output view.
private:
enum
{
- GSYM_CODE = -1U,
- CONSTANT_CODE = -2U
+ GSYM_CODE = 0x7fffffff,
+ CONSTANT_CODE = 0x7ffffffe,
+ RESERVED_CODE = 0x7ffffffd
};
union
{
// For a local symbol, the object.
- Sized_relobj<size, big_endian>* object;
+ Sized_relobj_file<size, big_endian>* object;
// For a global symbol, the symbol.
Symbol* gsym;
// For a constant, the 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_;
+ unsigned int local_sym_index_ : 31;
+ // Whether to use the PLT offset of the symbol if it has one.
+ bool use_plt_offset_ : 1;
};
typedef std::vector<Got_entry> Got_entries;
+ // Create a new GOT entry and return its offset.
+ unsigned int
+ add_got_entry(Got_entry got_entry);
+
+ // Create a pair of new GOT entries and return the offset of the first.
+ unsigned int
+ add_got_entry_pair(Got_entry got_entry_1, Got_entry got_entry_2);
+
// Return the offset into the GOT of GOT entry I.
unsigned int
got_offset(unsigned int i) const
// Set the size of the section.
void
set_got_size()
- { this->set_data_size(this->got_offset(this->entries_.size())); }
+ { this->set_current_data_size(this->got_offset(this->entries_.size())); }
// The list of GOT entries.
Got_entries entries_;
+
+ // List of available regions within the section, for incremental
+ // update links.
+ Free_list free_list_;
};
// Output_data_dynamic is used to hold the data in SHT_DYNAMIC
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 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)
{ 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()); }
+ 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
- do_set_address(uint64_t, off_t);
+ set_final_data_size();
// Write out the dynamic entries.
void
do_write(Output_file*);
- protected:
- // Adjust the output section to set the entry size.
+ // Write to a map file.
void
- do_adjust_output_section(Output_section*);
+ do_print_to_mapfile(Mapfile* mapfile) const
+ { mapfile->print_output_data(this, _("** dynamic")); }
private:
// This POD class holds a single dynamic entry.
public:
// Create an entry with a fixed numeric value.
Dynamic_entry(elfcpp::DT tag, unsigned int val)
- : tag_(tag), classification_(DYNAMIC_NUMBER)
+ : 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),
- classification_(section_size
- ? DYNAMIC_SECTION_SIZE
- : DYNAMIC_SECTION_ADDRESS)
+ offset_(section_size
+ ? DYNAMIC_SECTION_SIZE
+ : DYNAMIC_SECTION_ADDRESS)
+ {
+ 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_(offset)
{ this->u_.od = od; }
// Create an entry with the address of a symbol.
Dynamic_entry(elfcpp::DT tag, const Symbol* sym)
- : tag_(tag), classification_(DYNAMIC_SYMBOL)
+ : 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), classification_(DYNAMIC_STRING)
+ : 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
- write(unsigned char* pov, const Stringpool* ACCEPT_SIZE_ENDIAN) const;
+ write(unsigned char* pov, const Stringpool*) const;
private:
+ // Classification is encoded in the OFFSET field.
enum Classification
{
- // Number.
- DYNAMIC_NUMBER,
// Section address.
- DYNAMIC_SECTION_ADDRESS,
+ DYNAMIC_SECTION_ADDRESS = 0,
+ // Number.
+ DYNAMIC_NUMBER = -1U,
// Section size.
- DYNAMIC_SECTION_SIZE,
+ DYNAMIC_SECTION_SIZE = -2U,
// Symbol adress.
- DYNAMIC_SYMBOL,
+ DYNAMIC_SYMBOL = -3U,
// String.
- DYNAMIC_STRING
+ DYNAMIC_STRING = -4U
+ // Any other value indicates a section address plus OFFSET.
};
union
{
// For DYNAMIC_NUMBER.
unsigned int val;
- // For DYNAMIC_SECTION_ADDRESS and DYNAMIC_SECTION_SIZE.
+ // 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_;
+ // For DYNAMIC_SYMBOL with two sections.
+ const Output_data* od2;
// The dynamic tag.
elfcpp::DT tag_;
- // The type of entry.
- Classification classification_;
+ // The type of entry (Classification) or offset within a section.
+ unsigned int offset_;
};
// Add an entry to the list.
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, true),
+ 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_;
+};
+
+// 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_;
+};
+
+// 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_;
+};
+
+// This class is used to speed up look up of special input sections in an
+// Output_section.
+
+class Output_section_lookup_maps
+{
+ public:
+ Output_section_lookup_maps()
+ : is_valid_(true), merge_sections_by_properties_(),
+ merge_sections_by_id_(), relaxed_input_sections_by_id_()
+ { }
+
+ // Whether the maps are valid.
+ bool
+ is_valid() const
+ { return this->is_valid_; }
+
+ // Invalidate the maps.
+ void
+ invalidate()
+ { this->is_valid_ = false; }
+
+ // Clear the maps.
+ void
+ clear()
+ {
+ this->merge_sections_by_properties_.clear();
+ this->merge_sections_by_id_.clear();
+ this->relaxed_input_sections_by_id_.clear();
+ // A cleared map is valid.
+ this->is_valid_ = true;
+ }
+
+ // Find a merge section by merge section properties. Return NULL if none
+ // is found.
+ Output_merge_base*
+ find_merge_section(const Merge_section_properties& msp) const
+ {
+ gold_assert(this->is_valid_);
+ Merge_sections_by_properties::const_iterator p =
+ this->merge_sections_by_properties_.find(msp);
+ return p != this->merge_sections_by_properties_.end() ? p->second : NULL;
+ }
+
+ // Find a merge section by section ID of a merge input section. Return NULL
+ // if none is found.
+ Output_merge_base*
+ find_merge_section(const Object* object, unsigned int shndx) const
+ {
+ gold_assert(this->is_valid_);
+ Merge_sections_by_id::const_iterator p =
+ this->merge_sections_by_id_.find(Const_section_id(object, shndx));
+ return p != this->merge_sections_by_id_.end() ? p->second : NULL;
+ }
+
+ // Add a merge section pointed by POMB with properties MSP.
+ void
+ add_merge_section(const Merge_section_properties& msp,
+ Output_merge_base* pomb)
+ {
+ std::pair<Merge_section_properties, Output_merge_base*> value(msp, pomb);
+ std::pair<Merge_sections_by_properties::iterator, bool> result =
+ this->merge_sections_by_properties_.insert(value);
+ gold_assert(result.second);
+ }
+
+ // Add a mapping from a merged input section in OBJECT with index SHNDX
+ // to a merge output section pointed by POMB.
+ void
+ add_merge_input_section(const Object* object, unsigned int shndx,
+ Output_merge_base* pomb)
+ {
+ Const_section_id csid(object, shndx);
+ std::pair<Const_section_id, Output_merge_base*> value(csid, pomb);
+ std::pair<Merge_sections_by_id::iterator, bool> result =
+ this->merge_sections_by_id_.insert(value);
+ gold_assert(result.second);
+ }
+
+ // Find a relaxed input section of OBJECT with index SHNDX.
+ Output_relaxed_input_section*
+ find_relaxed_input_section(const Object* object, unsigned int shndx) const
+ {
+ gold_assert(this->is_valid_);
+ Relaxed_input_sections_by_id::const_iterator p =
+ this->relaxed_input_sections_by_id_.find(Const_section_id(object, shndx));
+ return p != this->relaxed_input_sections_by_id_.end() ? p->second : NULL;
+ }
+
+ // Add a relaxed input section pointed by POMB and whose original input
+ // section is in OBJECT with index SHNDX.
+ void
+ add_relaxed_input_section(const Relobj* relobj, unsigned int shndx,
+ Output_relaxed_input_section* poris)
+ {
+ Const_section_id csid(relobj, shndx);
+ std::pair<Const_section_id, Output_relaxed_input_section*>
+ value(csid, poris);
+ std::pair<Relaxed_input_sections_by_id::iterator, bool> result =
+ this->relaxed_input_sections_by_id_.insert(value);
+ gold_assert(result.second);
+ }
+
+ private:
+ typedef Unordered_map<Const_section_id, Output_merge_base*,
+ Const_section_id_hash>
+ Merge_sections_by_id;
+
+ typedef Unordered_map<Merge_section_properties, Output_merge_base*,
+ Merge_section_properties::hash,
+ Merge_section_properties::equal_to>
+ Merge_sections_by_properties;
+
+ typedef Unordered_map<Const_section_id, Output_relaxed_input_section*,
+ Const_section_id_hash>
+ Relaxed_input_sections_by_id;
+
+ // Whether this is valid
+ bool is_valid_;
+ // Merge sections by merge section properties.
+ Merge_sections_by_properties merge_sections_by_properties_;
+ // Merge sections by section IDs.
+ Merge_sections_by_id merge_sections_by_id_;
+ // Relaxed sections by section IDs.
+ Relaxed_input_sections_by_id relaxed_input_sections_by_id_;
+};
+
// 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
- // one. Return the offset within the output section.
+ // 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
+ // 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,
+ add_input_section(Layout* layout, Sized_relobj_file<size, big_endian>* object,
+ unsigned int shndx, const char* name,
const elfcpp::Shdr<size, big_endian>& shdr,
- unsigned int reloc_shndx);
+ 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);
+ // Add a relaxed input section PORIS called NAME to this output section
+ // with LAYOUT.
+ void
+ add_relaxed_input_section(Layout* layout,
+ Output_relaxed_input_section* poris,
+ const std::string& name);
+
// Return the section name.
const char*
name() const
flags() const
{ return this->flags_; }
- // 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.
+ // Update the output section flags based on input section flags.
void
- do_set_out_shndx(unsigned int shndx)
- {
- gold_assert(this->out_shndx_ == -1U);
- this->out_shndx_ = shndx;
- }
+ update_flags_for_input_section(elfcpp::Elf_Xword flags);
// Return the entsize field.
uint64_t
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)
unsigned int
info() const
{
- gold_assert(this->info_section_ == NULL);
+ 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_data* od)
+ 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_ == 0);
- this->info_section_ = od;
+ 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);
+ gold_assert(this->info_section_ == NULL
+ && this->info_symndx_ == NULL
+ && (this->info_ == 0
+ || this->info_ == v));
this->info_ = v;
}
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->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; }
+
+ // Returns true if input sections must be sorted according to the
+ // order in which their name appear in the --section-ordering-file.
+ bool
+ input_section_order_specified()
+ { return this->input_section_order_specified_; }
+
+ // Record that input sections must be sorted as some of their names
+ // match the patterns specified through --section-ordering-file.
+ void
+ set_input_section_order_specified()
+ { this->input_section_order_specified_ = 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; }
+
+ // Get the order in which this section appears in the PT_LOAD output
+ // segment.
+ Output_section_order
+ order() const
+ { return this->order_; }
+
+ // Set the order for this section.
+ void
+ set_order(Output_section_order order)
+ { this->order_ = order; }
+
+ // 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 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; }
+
// Return whether this section should be written after all the input
// sections are complete.
bool
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
// Return the offset within the output section of OFFSET relative to
// the start of input section SHNDX in object OBJECT.
- off_t
- output_offset(const Relobj* object, unsigned int shndx, off_t offset) const;
+ 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.
output_address(const Relobj* object, unsigned int shndx,
off_t offset) const;
- // Set the address 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 the final addresses
- // here.
- void
- do_set_address(uint64_t, off_t);
-
- // 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.
- void
- do_write(Output_file*);
-
- // Return the address alignment--function required by parent class.
- uint64_t
- do_addralign() const
- { return this->addralign_; }
-
- // Return whether this is an Output_section.
+ // 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
- do_is_section() const
- { return true; }
+ find_starting_output_address(const Relobj* object, unsigned int shndx,
+ uint64_t* addr) const;
- // Return whether this is a section of the specified type.
- bool
- do_is_section_type(elfcpp::Elf_Word type) const
- { return this->type_ == type; }
+ // 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 the specified section flag is set.
+ // Return whether this output section was found in the SECTIONS
+ // clause of a linker script.
bool
- do_is_section_flag_set(elfcpp::Elf_Xword flag) const
- { return (this->flags_ & flag) != 0; }
+ found_in_sections_clause() const
+ { return this->found_in_sections_clause_; }
// Write the section header into *OPHDR.
template<int size, bool big_endian>
write_header(const Layout*, const Stringpool*,
elfcpp::Shdr_write<size, big_endian>*) const;
- private:
+ // The next few calls are for linker script support.
+
// 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
Input_section(Relobj* object, unsigned int shndx, off_t data_size,
uint64_t addralign)
: shndx_(shndx),
- p2align_(ffsll(static_cast<long long>(addralign)))
+ p2align_(ffsll(static_cast<long long>(addralign))),
+ section_order_index_(0)
{
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),
+ section_order_index_(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),
+ section_order_index_(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),
+ section_order_index_(0)
+ {
+ this->u1_.data_size = 0;
+ this->u2_.poris = psection;
+ }
+
+ unsigned int
+ section_order_index() const
+ {
+ return this->section_order_index_;
+ }
+
+ void
+ set_section_order_index(unsigned int number)
+ {
+ this->section_order_index_ = number;
+ }
+
// The required alignment.
uint64_t
addralign() const
{
- return (this->p2align_ == 0
- ? 0
- : static_cast<uint64_t>(1) << (this->p2align_ - 1));
+ if (this->p2align_ != 0)
+ return static_cast<uint64_t>(1) << (this->p2align_ - 1);
+ else if (!this->is_input_section())
+ return this->u2_.posd->addralign();
+ else
+ return 0;
+ }
+
+ // Set the required alignment, which must be either 0 or a power of 2.
+ // For input sections that are sub-classes of Output_section_data, a
+ // alignment of zero means asking the underlying object for alignment.
+ void
+ set_addralign(uint64_t addralign)
+ {
+ if (addralign == 0)
+ this->p2align_ = 0;
+ else
+ {
+ gold_assert((addralign & (addralign - 1)) == 0);
+ this->p2align_ = ffsll(static_cast<long long>(addralign));
+ }
}
+
+ // Return the current required size, without finalization.
+ off_t
+ current_data_size() const;
// 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
+ && this->shndx_ != RELAXED_INPUT_SECTION_CODE);
+ }
+
// Return whether this is a merge section which matches the
// parameters.
bool
&& this->addralign() == addralign);
}
+ // Return whether this is a merge section for some input section.
+ bool
+ is_merge_section() const
+ {
+ return (this->shndx_ == MERGE_DATA_SECTION_CODE
+ || this->shndx_ == MERGE_STRING_SECTION_CODE);
+ }
+
+ // 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;
+
+ // Return the input section index for an input section.
+ unsigned int
+ shndx() const;
+
+ // 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;
+ }
+
+ // For a merge section, return the Output_merge_base pointer.
+ Output_merge_base*
+ output_merge_base() const
+ {
+ gold_assert(this->is_merge_section());
+ return this->u2_.pomb;
+ }
+
+ // 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.
void
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
- // Layout::finalize. SECOFF is the file offset of the enclosing
- // section.
+ // 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
- set_address(uint64_t addr, off_t off, off_t secoff);
+ finalize_data_size();
// Add an input section, for SHF_MERGE sections.
bool
// 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 output
- // offset.
+ // 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, off_t offset,
- off_t *poutput) const;
+ 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.
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
};
- // 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);
- }
-
// 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
{
// 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;
+ Output_merge_base* pomb;
+ // For RELAXED_INPUT_SECTION_CODE, the data.
+ Output_relaxed_input_section* poris;
} u2_;
+ // The line number of the pattern it matches in the --section-ordering-file
+ // file. It is 0 if does not match any pattern.
+ unsigned int section_order_index_;
};
+ // 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<Input_section>*);
+
+ // Add a script input section. A script input section can either be
+ // a plain input section or a sub-class of Output_section_data.
+ void
+ add_script_input_section(const Input_section& input_section);
+
+ // Set the current size of the output section.
+ void
+ set_current_data_size(off_t size)
+ { this->set_current_data_size_for_child(size); }
+
+ // 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();
+
+ // Whether this is a NOLOAD section.
+ bool
+ is_noload() const
+ { return this->is_noload_; }
+
+ // Set NOLOAD flag.
+ void
+ set_is_noload()
+ { this->is_noload_ = true; }
+
+ // Print merge statistics to stderr.
+ void
+ print_merge_stats();
+
+ // Set a fixed layout for the section. Used for incremental update links.
+ void
+ set_fixed_layout(uint64_t sh_addr, off_t sh_offset, off_t sh_size,
+ uint64_t sh_addralign);
+
+ // Return TRUE if the section has a fixed layout.
+ bool
+ has_fixed_layout() const
+ { return this->has_fixed_layout_; }
+
+ // Reserve space within the fixed layout for the section. Used for
+ // incremental update links.
+ void
+ reserve(uint64_t sh_offset, uint64_t sh_size);
+
+ protected:
+ // Return the output section--i.e., the object itself.
+ Output_section*
+ 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
+ {
+ 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;
+ }
+
+ // Update the 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 do a trial layout
+ // here.
+ virtual void
+ update_data_size();
+
+ // 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();
+
+ // 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
+ // 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();
+
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_; }
+
+ // Whether this always keeps an input section list
+ bool
+ always_keeps_input_sections() const
+ { return this->always_keeps_input_sections_; }
+
+ // Always keep an input section list.
+ void
+ set_always_keeps_input_sections()
+ {
+ gold_assert(this->current_data_size_for_child() == 0);
+ this->always_keeps_input_sections_ = true;
+ }
+
+ 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 for ctors and dtors.
+ struct Input_section_sort_compare
+ {
+ bool
+ operator()(const Input_section_sort_entry&,
+ 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;
+ };
+
+ // This is the sort comparison function when a section order is specified
+ // from an input file.
+ struct Input_section_sort_section_order_index_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.
- // 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. For a fill we record the
- // offset, and the actual data to be written out.
+ // 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_(length)
+ : section_offset_(section_offset),
+ length_(convert_to_section_size_type(length))
{ }
// Return section offset.
{ return this->section_offset_; }
// Return fill length.
- off_t
+ section_size_type
length() const
{ return this->length_; }
// The offset within the output section.
off_t section_offset_;
// The length of the space to fill.
- off_t length_;
+ section_size_type length_;
};
typedef std::vector<Fill> Fill_list;
+ // 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*);
// Add an SHF_MERGE input section. Returns true if the section was
- // handled.
+ // handled. If KEEPS_INPUT_SECTIONS is true, the output merge section
+ // stores information about the merged input sections.
bool
add_merge_input_section(Relobj* object, unsigned int shndx, uint64_t flags,
- uint64_t entsize, uint64_t addralign);
+ uint64_t entsize, uint64_t addralign,
+ bool keeps_input_sections);
// Add an output SHF_MERGE section POSD to this output section.
// IS_STRING indicates whether it is a SHF_STRINGS section, and
add_output_merge_section(Output_section_data* posd, bool is_string,
uint64_t entsize);
+ // Sort the attached input sections.
+ 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);
+
+ // Build the lookup maps for merge and relaxed input sections.
+ void
+ build_lookup_maps() const;
+
// Most of these fields are only valid after layout.
// The name of the section. This will point into a Stringpool.
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_data* info_section_;
- // If info_section_ is NULL, this is the section info field.
+ 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.
- elfcpp::Elf_Word type_;
+ const elfcpp::Elf_Word type_;
// The section flags.
elfcpp::Elf_Xword flags_;
+ // The order of this section in the output segment.
+ Output_section_order order_;
// The section index.
unsigned int out_shndx_;
// If there is a STT_SECTION for this output section in the normal
// 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.
// 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 input sections attached to this output section have to be
+ // sorted according to a specified order.
+ bool input_section_order_specified_ : 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 is a small section.
+ bool is_small_section_ : 1;
+ // True if this is a large section.
+ bool is_large_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;
+ // Whether this is a NOLOAD section.
+ bool is_noload_ : 1;
+ // Whether this always keeps input section.
+ bool always_keeps_input_sections_ : 1;
+ // Whether this section has a fixed layout, for incremental update links.
+ bool has_fixed_layout_ : 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_;
+ // Fast lookup maps for merged and relaxed input sections.
+ Output_section_lookup_maps* lookup_maps_;
+ // List of available regions within the section, for incremental
+ // update links.
+ Free_list free_list_;
};
// 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
{
filesz() const
{ return this->filesz_; }
+ // Return the file offset.
+ off_t
+ 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
- addralign();
+ maximum_alignment();
- // Add an Output_section to this segment.
+ // Add the Output_section OS to this PT_LOAD segment. SEG_FLAGS is
+ // the segment flags to use.
void
- add_output_section(Output_section* os, elfcpp::Elf_Word seg_flags)
- { this->add_output_section(os, seg_flags, false); }
+ add_output_section_to_load(Layout* layout, Output_section* os,
+ elfcpp::Elf_Word seg_flags);
- // Add an Output_section to the start of this segment.
+ // Add the Output_section OS to this non-PT_LOAD segment. SEG_FLAGS
+ // is the segment flags to use.
void
- add_initial_output_section(Output_section* os, elfcpp::Elf_Word seg_flags)
- { this->add_output_section(os, seg_flags, true); }
+ add_output_section_to_nonload(Output_section* os,
+ elfcpp::Elf_Word seg_flags);
- // Add an Output_data (which is not an Output_section) to the start
- // of this segment.
+ // 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 need not be 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;
+
+ // Whether this segment has a dynamic relocs.
+ bool
+ has_dynamic_reloc() 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;
+ }
+
+ // 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
+ set_flags(elfcpp::Elf_Word flags)
+ { this->flags_ = flags; }
+
// Set the address of the segment to ADDR and the offset to *POFF
- // (aligned if necessary), and set the addresses and offsets of all
- // contained output sections accordingly. Set the section indexes
- // of all contained output sections starting with *PSHNDX. Return
- // the address of the immediately following segment. Update *POFF
- // and *PSHNDX. This should only be called for a PT_LOAD segment.
+ // 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(uint64_t addr, off_t* poff, unsigned int* pshndx);
+ set_section_addresses(Layout*, bool reset, uint64_t addr,
+ unsigned int* increase_relro, bool* has_relro,
+ 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_addralign(uint64_t align)
+ set_minimum_p_align(uint64_t align)
{
- gold_assert(!this->is_align_known_);
- this->align_ = align;
+ if (align > this->min_p_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_offset(unsigned int increase);
+
+ // 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
template<int size, bool big_endian>
unsigned char*
write_section_headers(const Layout*, const Stringpool*, unsigned char* v,
- unsigned int* pshndx ACCEPT_SIZE_ENDIAN) const;
-
- private:
- Output_segment(const Output_segment&);
- Output_segment& operator=(const Output_segment&);
-
- typedef std::list<Output_data*> Output_data_list;
+ unsigned int* pshndx) const;
- // Add an Output_section to this segment, specifying front or back.
+ // Print the output sections in the map file.
void
- add_output_section(Output_section*, elfcpp::Elf_Word seg_flags,
- bool front);
+ print_sections_to_mapfile(Mapfile*) const;
+
+ private:
+ typedef std::vector<Output_data*> Output_data_list;
// Find the maximum alignment in an Output_data_list.
static uint64_t
- maximum_alignment(const Output_data_list*);
+ 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(Output_data_list*, uint64_t addr, off_t* poff,
- unsigned int* pshndx);
+ set_section_list_addresses(Layout*, bool reset, Output_data_list*,
+ uint64_t addr, off_t* poff, unsigned int* pshndx,
+ bool* in_tls);
// Return the number of Output_sections in an Output_data_list.
unsigned int
output_section_count_list(const Output_data_list*) const;
+ // Return whether an Output_data_list has a dynamic reloc.
+ bool
+ has_dynamic_reloc_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;
+
+ // Find the first and last entries by address.
+ void
+ find_first_and_last_list(const Output_data_list* pdl,
+ const Output_data** pfirst,
+ const Output_data** plast) 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 ACCEPT_SIZE_ENDIAN) const;
+ unsigned int* pshdx) 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_;
+ // 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 attached to this segment.
+ Output_data_list output_lists_[ORDER_MAX];
// 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 segment alignment. The is_align_known_ field indicates
- // whether this has been finalized. It can be set to a minimum
- // value before it is finalized.
- uint64_t align_;
+ // 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.
elfcpp::Elf_Word type_;
// The segment flags.
elfcpp::Elf_Word flags_;
- // Whether we have finalized align_.
- bool is_align_known_;
+ // 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;
+ // Whether this segment holds large data sections.
+ bool is_large_data_segment_ : 1;
};
// This class represents the output file.
class Output_file
{
public:
- Output_file(const General_options& options, Target*);
+ 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; }
- // Get a pointer to the target.
- Target*
- target() const
- { return this->target_; }
+ // 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. If BASE_NAME is not NULL, use the contents of
+ // that file as the base for incremental linking.
+ bool
+ open_base_file(const char* base_name, bool writable);
// 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);
- // Close the output file and make sure there are no error.
+ // 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. 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.
// Write data to the output file.
void
- write(off_t offset, const void* data, off_t len)
+ 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, off_t size)
+ get_output_view(off_t start, size_t size)
{
- gold_assert(start >= 0 && size >= 0 && start + size <= this->file_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, off_t, unsigned char*)
+ 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, off_t size)
+ 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, off_t, unsigned char*)
+ 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, off_t size)
+ 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, off_t, const unsigned char*)
+ free_input_view(off_t, size_t, const unsigned char*)
{ }
private:
- // General options.
- const General_options& options_;
- // Target.
- Target* target_;
+ // 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(bool);
+
+ // Unmap the file from memory (and flush to disk buffers).
+ void
+ unmap();
+
// File name.
const char* name_;
// File descriptor.
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 base_ was allocated using new rather than mmap.
+ bool map_is_allocated_;
+ // True if this is a temporary file which should not be output.
+ bool is_temporary_;
};
} // End namespace gold.
projects / deliverable / binutils-gdb.git / blobdiff