// output.h -- manage the output file for gold -*- C++ -*-
-// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
class Symbol;
class Output_file;
class Output_section;
+class Relocatable_relocs;
class Target;
template<int size, bool big_endian>
class Sized_target;
return this->offset_;
}
+ // Reset the address and file offset. This essentially disables the
+ // sanity testing about duplicate and unknown settings.
+ void
+ reset_address_and_file_offset()
+ {
+ this->is_address_valid_ = false;
+ this->is_offset_valid_ = false;
+ this->is_data_size_valid_ = false;
+ this->do_reset_address_and_file_offset();
+ }
+
// Return the required alignment.
uint64_t
addralign() const
{ return this->do_addralign(); }
+ // Return whether this has a load address.
+ bool
+ has_load_address() const
+ { return this->do_has_load_address(); }
+
+ // Return the load address.
+ uint64_t
+ load_address() const
+ { return this->do_load_address(); }
+
// Return whether this is an Output_section.
bool
is_section() const
is_section_flag_set(elfcpp::Elf_Xword shf) const
{ return this->do_is_section_flag_set(shf); }
+ // Return the output section that this goes in, if there is one.
+ Output_section*
+ output_section()
+ { return this->do_output_section(); }
+
// Return the output section index, if there is an output section.
unsigned int
out_shndx() const
}
}
+ // Set the TLS offset. Called only for SHT_TLS sections.
+ void
+ set_tls_offset(uint64_t tls_base)
+ { this->do_set_tls_offset(tls_base); }
+
+ // Return the TLS offset, relative to the base of the TLS segment.
+ // Valid only for SHT_TLS sections.
+ uint64_t
+ tls_offset() const
+ { return this->do_tls_offset(); }
+
// Write the data to the output file. This is called after
// Layout::finalize is complete.
void
dynamic_reloc_count() const
{ return this->dynamic_reloc_count_; }
+ // Whether the address is valid.
+ bool
+ is_address_valid() const
+ { return this->is_address_valid_; }
+
+ // Whether the file offset is valid.
+ bool
+ is_offset_valid() const
+ { return this->is_offset_valid_; }
+
+ // Whether the data size is valid.
+ bool
+ is_data_size_valid() const
+ { return this->is_data_size_valid_; }
+
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; }
+
// Return the output section index, if there is an output section.
virtual unsigned int
do_out_shndx() const
set_final_data_size()
{ gold_unreachable(); }
- // Functions that child classes may call.
+ // A hook for resetting the address and file offset.
+ virtual void
+ do_reset_address_and_file_offset()
+ { }
- // Whether the address is valid.
- bool
- is_address_valid() const
- { return this->is_address_valid_; }
+ // Set the TLS offset. Called only for SHT_TLS sections.
+ virtual void
+ do_set_tls_offset(uint64_t)
+ { gold_unreachable(); }
- // Whether the file offset is valid.
- bool
- is_offset_valid() const
- { return this->is_offset_valid_; }
+ // 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(); }
- // Whether the data size is valid.
- bool
- is_data_size_valid() const
- { return this->is_data_size_valid_; }
+ // Functions that child classes may call.
// Set the size of the data.
void
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.
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_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
do_sized_write(Output_file*);
+ // Return the value to use for the entry address.
+ template<int size>
+ typename elfcpp::Elf_types<size>::Elf_Addr
+ entry();
+
const Target* target_;
const Symbol_table* symtab_;
const Output_segment_headers* segment_header_;
const Output_section_headers* section_header_;
const Output_section* shstrtab_;
+ const char* entry_;
};
// Output sections are mainly comprised of input sections. However,
add_input_section(Relobj* object, unsigned int shndx)
{ return this->do_add_input_section(object, shndx); }
- // This class may change the output section name. This is called
- // right before shstrtab is written, so after all input-section
- // layout processing is done. The input is the old name, and the
- // output should be a new name (which will be copied into permanent
- // storage) to change the name, or NULL to keep the name as-is.
- virtual const char*
- do_modified_output_section_name(const char*)
- { return NULL; }
-
// Given an input OBJECT, an input section index SHNDX within that
// object, and an OFFSET relative to the start of that input
// section, return whether or not the corresponding offset within
// the output section is known. If this function returns true, it
// sets *POUTPUT to the output offset. The value -1 indicates that
// this input offset is being discarded.
- 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_; }
+
// 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_;
};
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()); }
+
private:
std::string data_;
};
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()); }
+
private:
const unsigned char* p_;
};
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()); }
+
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;
// 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);
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;
- }
+ unsigned int shndx, Address address, bool is_relative);
- // 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_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_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)
- {
- this->u1_.os = os;
- this->u2_.od = od;
- }
+ Address address);
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)
+ unsigned int shndx, Address address);
+
+ // Return TRUE if this is a RELATIVE relocation.
+ bool
+ is_relative() const
+ { return this->is_relative_; }
+
+ // Return whether this is against a local section symbol.
+ bool
+ is_local_section_symbol() const
{
- gold_assert(shndx != INVALID_CODE);
- this->u1_.os = os;
- this->u2_.relobj = relobj;
+ return (this->local_sym_index_ != GSYM_CODE
+ && this->local_sym_index_ != SECTION_CODE
+ && this->local_sym_index_ != INVALID_CODE
+ && this->is_section_symbol_);
}
+ // For a local section symbol, return the offset of the input
+ // section within the output section. ADDEND is the addend being
+ // applied to the input section.
+ section_offset_type
+ local_section_offset(Addend addend) const;
+
+ // Get the value of the symbol referred to by a Rel relocation when
+ // we are adding the given ADDEND.
+ Address
+ symbol_value(Addend addend) const;
+
// Write the reloc entry to an output view.
void
write(unsigned char* pov) const;
template<typename Write_rel>
void write_rel(Write_rel*) const;
+ // This is used when sorting dynamic relocs. Return -1 to sort this
+ // reloc before R2, 0 to sort the same as R2, 1 to sort after R2.
+ int
+ compare(const Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>& r2)
+ const;
+
+ // Return whether this reloc should be sorted before the argument
+ // when sorting dynamic relocs.
+ bool
+ sort_before(const Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>&
+ r2) const
+ { return this->compare(r2) < 0; }
+
private:
- // Return the symbol index. We can't do a double template
- // specialization, so we do a secondary template here.
+ // 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.
+ section_offset_type
+ get_address() const;
+
// Codes for local_sym_index_.
enum
{
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;
} u1_;
union
{
- // If shndx_ is not INVALID CODE, the object which holds the input
- // section being used to specify the reloc address.
+ // If this->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 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 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_ : 30;
+ // True if the relocation is a RELATIVE relocation.
+ bool is_relative_ : 1;
+ // True if the relocation is against a section symbol.
+ bool is_section_symbol_ : 1;
// If the reloc address is an input section in an object, the
// section index. This is INVALID_CODE if the reloc address is
// specified in some other way.
// 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)
+ : rel_(gsym, type, od, address, is_relative), addend_(addend)
{ }
Output_reloc(Symbol* gsym, unsigned int type, Relobj* relobj,
- unsigned int shndx, Address address, Addend addend)
- : rel_(gsym, type, relobj, shndx, address), addend_(addend)
+ unsigned int shndx, Address address, Addend addend,
+ bool is_relative)
+ : rel_(gsym, type, relobj, shndx, address, is_relative), addend_(addend)
{ }
// A reloc against a local symbol.
Output_reloc(Sized_relobj<size, big_endian>* relobj,
- unsigned int local_sym_index,
- unsigned int type, Output_data* od, Address address,
- Addend addend)
- : 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_section_symbol)
+ : rel_(relobj, local_sym_index, type, od, address, is_relative,
+ is_section_symbol),
+ addend_(addend)
{ }
Output_reloc(Sized_relobj<size, big_endian>* relobj,
- unsigned int local_sym_index,
- unsigned int type,
- unsigned int shndx,
- Address address,
- Addend addend)
- : 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_section_symbol)
+ : rel_(relobj, local_sym_index, type, shndx, address, is_relative,
+ is_section_symbol),
addend_(addend)
{ }
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 false;
+ else if (i > 0)
+ return true;
+ else
+ return this->addend_ < r2.addend_;
+ }
+
private:
// The basic reloc.
Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> rel_;
Reloc_types<sh_type, size, big_endian>::reloc_size;
// Construct the section.
- Output_data_reloc_base()
- : Output_section_data_build(Output_data::default_alignment_for_size(size))
+ Output_data_reloc_base(bool sort_relocs)
+ : Output_section_data_build(Output_data::default_alignment_for_size(size)),
+ sort_relocs_(sort_relocs)
{ }
protected:
private:
typedef std::vector<Output_reloc_type> Relocs;
+ // The class used to sort the relocations.
+ struct Sort_relocs_comparison
+ {
+ bool
+ operator()(const Output_reloc_type& r1, const Output_reloc_type& r2) const
+ { return r1.sort_before(r2); }
+ };
+
+ // The relocations in this section.
Relocs relocs_;
+ // Whether to sort the relocations when writing them out, to make
+ // the dynamic linker more efficient.
+ bool sort_relocs_;
};
// The class which callers actually create.
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(od, Output_reloc_type(gsym, type, od, address)); }
+ { this->add(od, Output_reloc_type(gsym, type, od, address, false)); }
void
add_global(Symbol* gsym, unsigned int type, Output_data* od, Relobj* relobj,
unsigned int shndx, Address address)
- { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address)); }
+ { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
+ false)); }
+
+ // These are to simplify the Copy_relocs class.
+
+ void
+ add_global(Symbol* gsym, unsigned int type, Output_data* od, Address address,
+ Address addend)
+ {
+ gold_assert(addend == 0);
+ this->add_global(gsym, type, od, address);
+ }
+
+ void
+ add_global(Symbol* gsym, unsigned int type, Output_data* od, Relobj* relobj,
+ unsigned int shndx, Address address, Address addend)
+ {
+ gold_assert(addend == 0);
+ this->add_global(gsym, type, od, relobj, shndx, address);
+ }
+
+ // Add a RELATIVE reloc against a global symbol. The final relocation
+ // will not reference the symbol.
+
+ void
+ add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
+ Address address)
+ { this->add(od, Output_reloc_type(gsym, type, od, address, true)); }
+
+ void
+ add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
+ Relobj* relobj, unsigned int shndx, Address address)
+ {
+ this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
+ true));
+ }
// Add a reloc against a local symbol.
add_local(Sized_relobj<size, big_endian>* relobj,
unsigned int local_sym_index, unsigned int type,
Output_data* od, Address address)
- { this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
- address)); }
+ {
+ this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
+ address, false, false));
+ }
void
add_local(Sized_relobj<size, big_endian>* relobj,
unsigned int local_sym_index, unsigned int type,
Output_data* od, unsigned int shndx, Address address)
- { this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
- address)); }
+ {
+ this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
+ address, false, false));
+ }
+ // Add a RELATIVE reloc against a local symbol.
+
+ void
+ add_local_relative(Sized_relobj<size, big_endian>* relobj,
+ unsigned int local_sym_index, unsigned int type,
+ Output_data* od, Address address)
+ {
+ this->add(od, Output_reloc_type(relobj, local_sym_index, type, od,
+ address, true, false));
+ }
+
+ void
+ add_local_relative(Sized_relobj<size, big_endian>* relobj,
+ unsigned int local_sym_index, unsigned int type,
+ Output_data* od, unsigned int shndx, Address address)
+ {
+ this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
+ address, true, false));
+ }
+
+ // Add a reloc against a local section symbol. This will be
+ // converted into a reloc against the STT_SECTION symbol of the
+ // output section.
+
+ void
+ add_local_section(Sized_relobj<size, big_endian>* relobj,
+ unsigned int input_shndx, unsigned int type,
+ Output_data* od, Address address)
+ {
+ this->add(od, Output_reloc_type(relobj, input_shndx, type, od,
+ address, false, true));
+ }
+
+ void
+ add_local_section(Sized_relobj<size, big_endian>* relobj,
+ unsigned int input_shndx, unsigned int type,
+ Output_data* od, unsigned int shndx, Address address)
+ {
+ this->add(od, Output_reloc_type(relobj, input_shndx, type, shndx,
+ address, false, true));
+ }
// A reloc against the STT_SECTION symbol of an output section.
// OS is the Output_section that the relocation refers to; OD is
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(od, Output_reloc_type(gsym, type, od, address, addend)); }
+ { this->add(od, Output_reloc_type(gsym, type, od, address, addend,
+ false)); }
void
add_global(Symbol* gsym, unsigned int type, Output_data* od, Relobj* relobj,
unsigned int shndx, Address address,
Addend addend)
{ this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
- addend)); }
+ addend, false)); }
+
+ // Add a RELATIVE reloc against a global symbol. The final output
+ // relocation will not reference the symbol, but we must keep the symbol
+ // information long enough to set the addend of the relocation correctly
+ // when it is written.
+
+ void
+ add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
+ Address address, Addend addend)
+ { this->add(od, Output_reloc_type(gsym, type, od, address, addend, true)); }
+
+ void
+ add_global_relative(Symbol* gsym, unsigned int type, Output_data* od,
+ Relobj* relobj, unsigned int shndx, Address address,
+ Addend addend)
+ { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address,
+ addend, true)); }
// Add a reloc against a local symbol.
Output_data* od, Address address, Addend addend)
{
this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
- addend));
+ addend, false, false));
}
void
Addend addend)
{
this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
- address, addend));
+ address, addend, false, false));
+ }
+
+ // Add a RELATIVE reloc against a local symbol.
+
+ void
+ add_local_relative(Sized_relobj<size, big_endian>* relobj,
+ unsigned int local_sym_index, unsigned int type,
+ Output_data* od, Address address, Addend addend)
+ {
+ this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address,
+ addend, true, false));
+ }
+
+ void
+ add_local_relative(Sized_relobj<size, big_endian>* relobj,
+ unsigned int local_sym_index, unsigned int type,
+ Output_data* od, unsigned int shndx, Address address,
+ Addend addend)
+ {
+ this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx,
+ address, addend, true, false));
+ }
+
+ // Add a reloc against a local section symbol. This will be
+ // converted into a reloc against the STT_SECTION symbol of the
+ // output section.
+
+ void
+ add_local_section(Sized_relobj<size, big_endian>* relobj,
+ unsigned int input_shndx, unsigned int type,
+ Output_data* od, Address address, Addend addend)
+ {
+ this->add(od, Output_reloc_type(relobj, input_shndx, type, od, address,
+ addend, false, true));
+ }
+
+ void
+ add_local_section(Sized_relobj<size, big_endian>* relobj,
+ unsigned int input_shndx, unsigned int type,
+ Output_data* od, unsigned int shndx, Address address,
+ Addend addend)
+ {
+ this->add(od, Output_reloc_type(relobj, input_shndx, type, shndx,
+ address, addend, false, true));
}
// A reloc against the STT_SECTION symbol of an output section.
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*)
+ { }
+
+ private:
+ // The relocs associated with this input section.
+ Relocatable_relocs* rr_;
+};
+
+// Handle a GROUP section.
+
+template<int size, bool big_endian>
+class Output_data_group : public Output_section_data
+{
+ public:
+ // The constructor clears *INPUT_SHNDXES.
+ Output_data_group(Sized_relobj<size, big_endian>* relobj,
+ section_size_type entry_count,
+ elfcpp::Elf_Word flags,
+ std::vector<unsigned int>* input_shndxes);
+
+ void
+ do_write(Output_file*);
+
+ private:
+ // The input object.
+ Sized_relobj<size, big_endian>* relobj_;
+ // The group flag word.
+ elfcpp::Elf_Word flags_;
+ // The section indexes of the input sections in this group.
+ std::vector<unsigned int> input_shndxes_;
+};
+
// Output_data_got is used to manage a GOT. Each entry in the GOT is
// for one symbol--either a global symbol or a local symbol in an
// object. The target specific code adds entries to the GOT as
{
public:
typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype;
+ typedef Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian> Rel_dyn;
+ typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Rela_dyn;
Output_data_got()
: Output_section_data_build(Output_data::default_alignment_for_size(size)),
// 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);
+
+ // 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<size, big_endian>* object, unsigned int sym_index,
+ unsigned int got_type);
- // Add an entry (or pair of entries) for a global TLS 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_tls(Symbol* gsym, bool need_pair);
+ // Add an entry for a local symbol to the GOT, and add a dynamic
+ // relocation of type R_TYPE for the GOT entry.
+ void
+ add_local_with_rel(Sized_relobj<size, big_endian>* object,
+ unsigned int sym_index, unsigned int got_type,
+ Rel_dyn* rel_dyn, unsigned int r_type);
- // Add an entry (or pair of entries) for a local TLS 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_tls(Sized_relobj<size, big_endian>* object,
- unsigned int sym_index, bool need_pair);
+ void
+ add_local_with_rela(Sized_relobj<size, big_endian>* object,
+ unsigned int sym_index, unsigned int got_type,
+ Rela_dyn* rela_dyn, unsigned int r_type);
+
+ // Add a pair of entries for a local symbol to the GOT, and add
+ // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
+ void
+ add_local_pair_with_rel(Sized_relobj<size, big_endian>* object,
+ unsigned int sym_index, unsigned int shndx,
+ unsigned int got_type, Rel_dyn* rel_dyn,
+ unsigned int r_type_1, unsigned int r_type_2);
+
+ void
+ add_local_pair_with_rela(Sized_relobj<size, big_endian>* object,
+ unsigned int sym_index, unsigned int shndx,
+ unsigned int got_type, Rela_dyn* rela_dyn,
+ unsigned int r_type_1, unsigned int r_type_2);
// Add a constant to the GOT. This returns the offset of the new
// entry from the start of the GOT.
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)
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; }
+
+ // 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; }
// 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;
} u_;
// 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),
+ 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*);
+
+ private:
+ template<bool big_endian>
+ void
+ endian_do_write(unsigned char*);
+
+ // It is likely that most symbols will not require entries. Rather
+ // than keep a vector for all symbols, we keep pairs of symbol index
+ // and section index.
+ typedef std::vector<std::pair<unsigned int, unsigned int> > Xindex_entries;
+
+ // The entries we need.
+ Xindex_entries entries_;
+};
+
// An output section. We don't expect to have too many output
// sections, so we don't bother to do a template on the size.
{
public:
// Create an output section, giving the name, type, and flags.
- Output_section(const General_options& options,
- const char* name, elfcpp::Elf_Word, elfcpp::Elf_Xword);
+ Output_section(const char* name, elfcpp::Elf_Word, elfcpp::Elf_Xword);
virtual ~Output_section();
// Add a new input section SHNDX, named NAME, with header SHDR, from
// object OBJECT. RELOC_SHNDX is the index of a relocation section
// which applies to this section, or 0 if none, or -1U if more than
- // one. Return the offset within the output section.
+ // one. HAVE_SECTIONS_SCRIPT is true if we have a SECTIONS clause
+ // in a linker script; in that case we need to keep track of input
+ // sections associated with an output section. Return the offset
+ // within the output section.
template<int size, bool big_endian>
off_t
add_input_section(Sized_relobj<size, big_endian>* object, unsigned int shndx,
const char *name,
const elfcpp::Shdr<size, big_endian>& shdr,
- unsigned int reloc_shndx);
+ unsigned int reloc_shndx, bool have_sections_script);
// Add generated data POSD to this output section.
void
name() const
{ return this->name_; }
- // Modify the section name. This should be called only after this
- // section is done being constructed. The input should be a pointer
- // into layout's namepool_.
- void
- set_name(const char* newname)
- { this->name_ = newname; }
-
// Return the section type.
elfcpp::Elf_Word
type() const
flags() const
{ return this->flags_; }
+ // Set the section flags. This may only be used with the Layout
+ // code when it is prepared to move the section to a different
+ // segment.
+ void
+ set_flags(elfcpp::Elf_Xword flags)
+ { this->flags_ = flags; }
+
+ // Update the output section flags based on input section flags.
+ void
+ update_flags_for_input_section(elfcpp::Elf_Xword flags)
+ {
+ this->flags_ |= (flags
+ & (elfcpp::SHF_WRITE
+ | elfcpp::SHF_ALLOC
+ | elfcpp::SHF_EXECINSTR));
+ }
+
// Return the entsize field.
uint64_t
entsize() const
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_ == 0);
- this->info_section_ = od;
+ gold_assert(this->info_section_ == NULL
+ && (this->info_symndx_ == NULL
+ || this->info_symndx_ == sym)
+ && this->info_ == 0);
+ this->info_symndx_ = sym;
+ }
+
+ // Set the info field to the symbol table index of a section symbol.
+ void
+ set_info_section_symndx(const Output_section* os)
+ {
+ gold_assert((this->info_section_ == NULL
+ || (this->info_section_ == os
+ && !this->info_uses_section_index_))
+ && this->info_symndx_ == NULL
+ && this->info_ == 0);
+ this->info_section_ = os;
+ this->info_uses_section_index_ = false;
}
// Set the info field to a constant.
void
set_info(unsigned int v)
{
- gold_assert(this->info_section_ == NULL);
+ 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; }
+
+ // Return whether the input sections attached to this output section
+ // require sorting. This is used to handle constructor priorities
+ // compatibly with GNU ld.
+ bool
+ must_sort_attached_input_sections() const
+ { return this->must_sort_attached_input_sections_; }
+
+ // Record that the input sections attached to this output section
+ // require sorting.
+ void
+ set_must_sort_attached_input_sections()
+ { this->must_sort_attached_input_sections_ = true; }
+
// Return whether this section should be written after all the input
// sections are complete.
bool
requires_postprocessing() const
{ return this->requires_postprocessing_; }
- // Record that this section requires postprocessing after all
- // relocations have been applied.
+ // 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
- set_requires_postprocessing()
- { this->requires_postprocessing_ = true; }
+ 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.
// 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;
+ // Return the output address of the start of the merged section for
+ // input section SHNDX in object OBJECT. This is not necessarily
+ // the offset corresponding to input offset 0 in the section, since
+ // the section may be mapped arbitrarily.
+ uint64_t
+ starting_output_address(const Relobj* object, unsigned int shndx) const;
+
+ // Record that this output section was found in the SECTIONS clause
+ // of a linker script.
+ void
+ set_found_in_sections_clause()
+ { this->found_in_sections_clause_ = true; }
+
+ // Return whether this output section was found in the SECTIONS
+ // clause of a linker script.
+ bool
+ found_in_sections_clause() const
+ { return this->found_in_sections_clause_; }
+
// Write the section header into *OPHDR.
template<int size, bool big_endian>
void
write_header(const Layout*, const Stringpool*,
elfcpp::Shdr_write<size, big_endian>*) const;
- // This class may change the output section name. This is called
- // right before shstrtab is written, so after all input-section
- // layout processing is done. This calls
- // do_modified_output_section_name() on all its output_section_data
- // members, and changes the name if any member so suggests. If
- // several members would suggest, this takes the first, arbitrarily.
- // Return true if the name was modified, false else.
- bool
- maybe_modify_output_section_name();
+ // The next few calls are for linker script support.
+
+ // Store the list of input sections for this Output_section into the
+ // list passed in. This removes the input sections, leaving only
+ // any Output_section_data elements. This returns the size of those
+ // Output_section_data elements. ADDRESS is the address of this
+ // output section. FILL is the fill value to use, in case there are
+ // any spaces between the remaining Output_section_data elements.
+ uint64_t
+ get_input_sections(uint64_t address, const std::string& fill,
+ std::list<std::pair<Relobj*, unsigned int > >*);
+
+ // Add an input section from a script.
+ void
+ add_input_section_for_script(Relobj* object, unsigned int shndx,
+ off_t data_size, uint64_t addralign);
+
+ // Set the current size of the output section.
+ void
+ set_current_data_size(off_t size)
+ { this->set_current_data_size_for_child(size); }
+
+ // Get the current size of the output section.
+ off_t
+ current_data_size() const
+ { return this->current_data_size_for_child(); }
+
+ // End of linker script support.
+
+ // Print merge statistics to stderr.
+ void
+ print_merge_stats();
protected:
+ // Return the output section--i.e., the object itself.
+ Output_section*
+ do_output_section()
+ { return this; }
+
// Return the section index in the output file.
unsigned int
do_out_shndx() const
void
do_set_out_shndx(unsigned int shndx)
{
- gold_assert(this->out_shndx_ == -1U);
+ gold_assert(this->out_shndx_ == -1U || this->out_shndx_ == shndx);
this->out_shndx_ = shndx;
}
// Output_section, there is nothing to do, but if there are any
// Output_section_data objects we need to set their final addresses
// here.
- void
+ virtual void
set_final_data_size();
+ // Reset the address and file offset.
+ void
+ do_reset_address_and_file_offset();
+
// Write the data to the file. For a typical Output_section, this
// does nothing: the data is written out by calling Object::Relocate
// on each input object. But if there are any Output_section_data
// objects we do need to write them out here.
- void
+ virtual void
do_write(Output_file*);
// Return the address alignment--function required by parent class.
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
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*)
+ { }
+
+ // Record that this section requires postprocessing after all
+ // relocations have been applied. This is called by a child class.
+ void
+ set_requires_postprocessing()
+ {
+ this->requires_postprocessing_ = true;
+ this->after_input_sections_ = true;
+ }
+
+ // Write all the data of an Output_section into the postprocessing
+ // buffer.
+ void
+ write_to_postprocessing_buffer();
+
private:
// In some cases we need to keep a list of the input sections
// associated with this output section. We only need the list if we
off_t
data_size() const;
+ // Whether this is an input section.
+ bool
+ is_input_section() const
+ {
+ return (this->shndx_ != OUTPUT_SECTION_CODE
+ && this->shndx_ != MERGE_DATA_SECTION_CODE
+ && this->shndx_ != MERGE_STRING_SECTION_CODE);
+ }
+
// Return whether this is a merge section which matches the
// parameters.
bool
&& this->addralign() == addralign);
}
+ // Return the object for an input section.
+ Relobj*
+ relobj() const
+ {
+ gold_assert(this->is_input_section());
+ return this->u2_.object;
+ }
+
+ // Return the input section index for an input section.
+ unsigned int
+ shndx() const
+ {
+ gold_assert(this->is_input_section());
+ return this->shndx_;
+ }
+
// Set the output section.
void
set_output_section(Output_section* os)
}
// Set the address and file offset. This is called during
- // Layout::finalize. SECOFF is the file offset of the enclosing
- // section.
+ // Layout::finalize. SECTION_FILE_OFFSET is the file offset of
+ // the enclosing section.
void
- set_address(uint64_t addr, off_t off, off_t secoff);
+ set_address_and_file_offset(uint64_t address, off_t file_offset,
+ off_t section_file_offset);
- // Call modified_output_section_name on the output-section-data object.
- const char*
- modified_output_section_name(const char* name) const
- {
- if (this->is_input_section())
- return NULL;
- return this->u2_.posd->do_modified_output_section_name(name);
- }
+ // Reset the address and file offset.
+ void
+ reset_address_and_file_offset();
+
+ // Finalize the data size.
+ void
+ finalize_data_size();
// Add an input section, for SHF_MERGE sections.
bool
// 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 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_STRING_SECTION_CODE = -3U
};
- // 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
typedef std::vector<Input_section> Input_section_list;
+ // This class is used to sort the input sections.
+ class Input_section_sort_entry;
+
+ // This is the sort comparison function.
+ struct Input_section_sort_compare
+ {
+ bool
+ operator()(const Input_section_sort_entry&,
+ const Input_section_sort_entry&) const;
+ };
+
// Fill data. This is used to fill in data between input sections.
- // 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;
// handled.
bool
add_merge_input_section(Relobj* object, unsigned int shndx, uint64_t flags,
- uint64_t entsize, uint64_t addralign,
- bool can_compress_section);
+ uint64_t entsize, uint64_t addralign);
// Add an output SHF_MERGE section POSD to this output section.
// IS_STRING indicates whether it is a SHF_STRINGS section, and
add_output_merge_section(Output_section_data* posd, bool is_string,
uint64_t entsize);
+ // Sort the attached input sections.
+ void
+ sort_attached_input_sections();
+
// Most of these fields are only valid after layout.
- // General options.
- const General_options& options_;
// The name of the section. This will point into a Stringpool.
const char* name_;
// The section address is in the parent class.
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.
const elfcpp::Elf_Word type_;
// The section flags.
- const elfcpp::Elf_Xword flags_;
+ elfcpp::Elf_Xword flags_;
// The section index.
unsigned int out_shndx_;
// If there is a STT_SECTION for this output section in the normal
// 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 requires post processing after all
// relocations have been applied.
bool requires_postprocessing_ : 1;
+ // Whether an input section was mapped to this output section
+ // because of a SECTIONS clause in a linker script.
+ bool found_in_sections_clause_ : 1;
+ // Whether this section has an explicitly specified load address.
+ bool has_load_address_ : 1;
+ // True if the info_section_ field means the section index of the
+ // section, false if it means the symbol index of the corresponding
+ // section symbol.
+ bool info_uses_section_index_ : 1;
+ // True if the input sections attached to this output section may
+ // need sorting.
+ bool may_sort_attached_input_sections_ : 1;
+ // True if the input sections attached to this output section must
+ // be sorted.
+ bool must_sort_attached_input_sections_ : 1;
+ // True if the input sections attached to this output section have
+ // already been sorted.
+ bool attached_input_sections_are_sorted_ : 1;
+ // For SHT_TLS sections, the offset of this section relative to the base
+ // of the TLS segment.
+ uint64_t tls_offset_;
};
// An output segment. PT_LOAD segments are built from collections of
filesz() const
{ return this->filesz_; }
+ // Return the file offset.
+ off_t
+ offset() const
+ { return this->offset_; }
+
// Return the maximum alignment of the Output_data.
uint64_t
- addralign();
+ maximum_alignment();
// Add an Output_section to this segment.
void
add_initial_output_section(Output_section* os, elfcpp::Elf_Word seg_flags)
{ this->add_output_section(os, seg_flags, true); }
+ // Remove an Output_section from this segment. It is an error if it
+ // is not present.
+ void
+ remove_output_section(Output_section* os);
+
// Add an Output_data (which is not an Output_section) to the start
// of this segment.
void
add_initial_output_data(Output_data*);
+ // Return true if this segment has any sections which hold actual
+ // data, rather than being a BSS section.
+ bool
+ has_any_data_sections() const
+ { return !this->output_data_.empty(); }
+
// Return the number of dynamic relocations applied to this segment.
unsigned int
dynamic_reloc_count() const;
+ // Return the address of the first section.
+ uint64_t
+ first_section_load_address() const;
+
+ // Return whether the addresses have been set already.
+ bool
+ are_addresses_set() const
+ { return this->are_addresses_set_; }
+
+ // Set the addresses.
+ void
+ set_addresses(uint64_t vaddr, uint64_t paddr)
+ {
+ this->vaddr_ = vaddr;
+ this->paddr_ = paddr;
+ this->are_addresses_set_ = true;
+ }
+
+ // Set the segment flags. This is only used if we have a PHDRS
+ // clause which explicitly specifies the flags.
+ void
+ set_flags(elfcpp::Elf_Word flags)
+ { this->flags_ = flags; }
+
// Set the address of the segment to ADDR and the offset to *POFF
- // (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(const Layout*, bool reset, uint64_t addr, off_t* poff,
+ unsigned int* pshndx);
// Set the minimum alignment of this segment. This may be adjusted
// upward based on the section alignments.
void
- set_minimum_addralign(uint64_t align)
- {
- gold_assert(!this->is_align_known_);
- this->align_ = align;
- }
+ set_minimum_p_align(uint64_t align)
+ { this->min_p_align_ = align; }
// Set the offset of this segment based on the section. This should
// only be called for a non-PT_LOAD segment.
void
set_offset();
+ // Set the TLS offsets of the sections contained in the PT_TLS segment.
+ void
+ set_tls_offsets();
+
// Return the number of output sections.
unsigned int
output_section_count() const;
+ // Return the section attached to the list segment with the lowest
+ // load address. This is used when handling a PHDRS clause in a
+ // linker script.
+ Output_section*
+ section_with_lowest_load_address() const;
+
// Write the segment header into *OPHDR.
template<int size, bool big_endian>
void
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;
+ unsigned int* pshndx) const;
private:
Output_segment(const Output_segment&);
// 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*);
// 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(const 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
unsigned int
dynamic_reloc_count_list(const Output_data_list*) const;
+ // Find the section with the lowest load address in an
+ // Output_data_list.
+ void
+ lowest_load_address_in_list(const Output_data_list* pdl,
+ Output_section** found,
+ uint64_t* found_lma) const;
+
// Write the section headers in the list into V.
template<int size, bool big_endian>
unsigned char*
write_section_headers_list(const Layout*, const Stringpool*,
const Output_data_list*, unsigned char* v,
- unsigned int* pshdx ACCEPT_SIZE_ENDIAN) const;
+ unsigned int* pshdx) const;
// The list of output data with contents attached to this segment.
Output_data_list output_data_;
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;
};
// This class represents the output file.
class Output_file
{
public:
- Output_file(const General_options& options, Target*);
+ Output_file(const char* name);
- // Get a pointer to the target.
- Target*
- target() const
- { return this->target_; }
+ // Indicate that this is a temporary file which should not be
+ // output.
+ void
+ set_is_temporary()
+ { this->is_temporary_ = true; }
// Open the output file. FILE_SIZE is the final size of the file.
void
void
resize(off_t file_size);
- // Close the output file and make sure there are no error.
+ // Close the output file (flushing all buffered data) and make sure
+ // there are no errors.
void
close();
// 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:
- // Map the file into memory.
+ // Map the file into memory and return a pointer to the map.
void
map();
- // General options.
- const General_options& options_;
- // Target.
- Target* target_;
+ // 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 this is a temporary file which should not be output.
+ bool is_temporary_;
};
} // End namespace gold.
projects / binutils-gdb.git / blobdiff