diff options
Diffstat (limited to 'gold/layout.cc')
| -rw-r--r-- | gold/layout.cc | 278 |
1 files changed, 236 insertions, 42 deletions
diff --git a/gold/layout.cc b/gold/layout.cc index 84e8722..6894264 100644 --- a/gold/layout.cc +++ b/gold/layout.cc @@ -101,7 +101,7 @@ is_prefix_of(const char* prefix, const char* str) template<int size, bool big_endian> bool -Layout::include_section(Object*, const char* name, +Layout::include_section(Sized_relobj<size, big_endian>*, const char* name, const elfcpp::Shdr<size, big_endian>& shdr) { // Some section types are never linked. Some are only linked when @@ -202,13 +202,20 @@ Layout::get_output_section(const char* name, Stringpool::Key name_key, } // Return the output section to use for input section SHNDX, with name -// NAME, with header HEADER, from object OBJECT. Set *OFF to the -// offset of this input section without the output section. +// NAME, with header HEADER, 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. RELOC_TYPE is the type of the +// relocation section if there is one. Set *OFF to the offset of this +// input section without the output section. Return NULL if the +// section should be discarded. Set *OFF to -1 if the section +// contents should not be written directly to the output file, but +// will instead receive special handling. template<int size, bool big_endian> Output_section* -Layout::layout(Relobj* object, unsigned int shndx, const char* name, - const elfcpp::Shdr<size, big_endian>& shdr, off_t* off) +Layout::layout(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, off_t* off) { if (!this->include_section(object, name, shdr)) return NULL; @@ -231,38 +238,44 @@ Layout::layout(Relobj* object, unsigned int shndx, const char* name, shdr.get_sh_type(), shdr.get_sh_flags()); - // Special GNU handling of sections named .eh_frame. - if (!parameters->output_is_object() - && strcmp(name, ".eh_frame") == 0 - && shdr.get_sh_size() > 0 - && shdr.get_sh_type() == elfcpp::SHT_PROGBITS - && shdr.get_sh_flags() == elfcpp::SHF_ALLOC) - { - this->layout_eh_frame(object, shndx, name, shdr, os, off); - return os; - } - // FIXME: Handle SHF_LINK_ORDER somewhere. - *off = os->add_input_section(object, shndx, name, shdr); + *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx); return os; } -// Special GNU handling of sections named .eh_frame. They will -// normally hold exception frame data. +// Special GNU handling of sections name .eh_frame. They will +// normally hold exception frame data as defined by the C++ ABI +// (http://codesourcery.com/cxx-abi/). template<int size, bool big_endian> -void -Layout::layout_eh_frame(Relobj* object, +Output_section* +Layout::layout_eh_frame(Sized_relobj<size, big_endian>* object, + const unsigned char* symbols, + off_t symbols_size, + const unsigned char* symbol_names, + off_t symbol_names_size, unsigned int shndx, - const char* name, const elfcpp::Shdr<size, big_endian>& shdr, - Output_section* os, off_t* off) + unsigned int reloc_shndx, unsigned int reloc_type, + off_t* off) { + gold_assert(shdr.get_sh_type() == elfcpp::SHT_PROGBITS); + gold_assert(shdr.get_sh_flags() == elfcpp::SHF_ALLOC); + + Stringpool::Key name_key; + const char* name = this->namepool_.add(".eh_frame", false, &name_key); + + Output_section* os = this->get_output_section(name, name_key, + elfcpp::SHT_PROGBITS, + elfcpp::SHF_ALLOC); + if (this->eh_frame_section_ == NULL) { this->eh_frame_section_ = os; + this->eh_frame_data_ = new Eh_frame(); + os->add_output_section_data(this->eh_frame_data_); if (this->options_.create_eh_frame_hdr()) { @@ -275,19 +288,39 @@ Layout::layout_eh_frame(Relobj* object, elfcpp::SHT_PROGBITS, elfcpp::SHF_ALLOC); - Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os); + Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os, this->eh_frame_data_); hdr_os->add_output_section_data(hdr_posd); + hdr_os->set_after_input_sections(); + Output_segment* hdr_oseg = new Output_segment(elfcpp::PT_GNU_EH_FRAME, elfcpp::PF_R); this->segment_list_.push_back(hdr_oseg); hdr_oseg->add_output_section(hdr_os, elfcpp::PF_R); + + this->eh_frame_data_->set_eh_frame_hdr(hdr_posd); } } gold_assert(this->eh_frame_section_ == os); - *off = os->add_input_section(object, shndx, name, shdr); + if (this->eh_frame_data_->add_ehframe_input_section(object, + symbols, + symbols_size, + symbol_names, + symbol_names_size, + shndx, + reloc_shndx, + reloc_type)) + *off = -1; + else + { + // We couldn't handle this .eh_frame section for some reason. + // Add it as a normal section. + *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx); + } + + return os; } // Add POSD to an output section using NAME, TYPE, and FLAGS. @@ -1724,6 +1757,22 @@ Layout::add_comdat(const char* signature, bool group) } } +// Write out the Output_sections. Most won't have anything to write, +// since most of the data will come from input sections which are +// handled elsewhere. But some Output_sections do have Output_data. + +void +Layout::write_output_sections(Output_file* of) const +{ + for (Section_list::const_iterator p = this->section_list_.begin(); + p != this->section_list_.end(); + ++p) + { + if (!(*p)->after_input_sections()) + (*p)->write(of); + } +} + // Write out data not associated with a section or the symbol table. void @@ -1764,15 +1813,6 @@ Layout::write_data(const Symbol_table* symtab, Output_file* of) const } } - // Write out the Output_sections. Most won't have anything to - // write, since most of the data will come from input sections which - // are handled elsewhere. But some Output_sections do have - // Output_data. - for (Section_list::const_iterator p = this->section_list_.begin(); - p != this->section_list_.end(); - ++p) - (*p)->write(of); - // Write out the Output_data which are not in an Output_section. for (Data_list::const_iterator p = this->special_output_list_.begin(); p != this->special_output_list_.end(); @@ -1780,6 +1820,65 @@ Layout::write_data(const Symbol_table* symtab, Output_file* of) const (*p)->write(of); } +// Write out the Output_sections which can only be written after the +// input sections are complete. + +void +Layout::write_sections_after_input_sections(Output_file* of) const +{ + for (Section_list::const_iterator p = this->section_list_.begin(); + p != this->section_list_.end(); + ++p) + { + if ((*p)->after_input_sections()) + (*p)->write(of); + } +} + +// Write_sections_task methods. + +// We can always run this task. + +Task::Is_runnable_type +Write_sections_task::is_runnable(Workqueue*) +{ + return IS_RUNNABLE; +} + +// We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER +// when finished. + +class Write_sections_task::Write_sections_locker : public Task_locker +{ + public: + Write_sections_locker(Task_token& output_sections_blocker, + Task_token& final_blocker, + Workqueue* workqueue) + : output_sections_block_(output_sections_blocker, workqueue), + final_block_(final_blocker, workqueue) + { } + + private: + Task_block_token output_sections_block_; + Task_block_token final_block_; +}; + +Task_locker* +Write_sections_task::locks(Workqueue* workqueue) +{ + return new Write_sections_locker(*this->output_sections_blocker_, + *this->final_blocker_, + workqueue); +} + +// Run the task--write out the data. + +void +Write_sections_task::run(Workqueue*) +{ + this->layout_->write_output_sections(this->of_); +} + // Write_data_task methods. // We can always run this task. @@ -1833,6 +1932,34 @@ Write_symbols_task::run(Workqueue*) this->of_); } +// Write_after_input_sections_task methods. + +// We can only run this task after the input sections have completed. + +Task::Is_runnable_type +Write_after_input_sections_task::is_runnable(Workqueue*) +{ + if (this->input_sections_blocker_->is_blocked()) + return IS_BLOCKED; + return IS_RUNNABLE; +} + +// We need to unlock FINAL_BLOCKER when finished. + +Task_locker* +Write_after_input_sections_task::locks(Workqueue* workqueue) +{ + return new Task_locker_block(*this->final_blocker_, workqueue); +} + +// Run the task. + +void +Write_after_input_sections_task::run(Workqueue*) +{ + this->layout_->write_sections_after_input_sections(this->of_); +} + // Close_task_runner methods. // Run the task--close the file. @@ -1849,30 +1976,97 @@ Close_task_runner::run(Workqueue*) #ifdef HAVE_TARGET_32_LITTLE template Output_section* -Layout::layout<32, false>(Relobj* object, unsigned int shndx, const char* name, - const elfcpp::Shdr<32, false>& shdr, off_t*); +Layout::layout<32, false>(Sized_relobj<32, false>* object, unsigned int shndx, + const char* name, + const elfcpp::Shdr<32, false>& shdr, + unsigned int, unsigned int, off_t*); #endif #ifdef HAVE_TARGET_32_BIG template Output_section* -Layout::layout<32, true>(Relobj* object, unsigned int shndx, const char* name, - const elfcpp::Shdr<32, true>& shdr, off_t*); +Layout::layout<32, true>(Sized_relobj<32, true>* object, unsigned int shndx, + const char* name, + const elfcpp::Shdr<32, true>& shdr, + unsigned int, unsigned int, off_t*); #endif #ifdef HAVE_TARGET_64_LITTLE template Output_section* -Layout::layout<64, false>(Relobj* object, unsigned int shndx, const char* name, - const elfcpp::Shdr<64, false>& shdr, off_t*); +Layout::layout<64, false>(Sized_relobj<64, false>* object, unsigned int shndx, + const char* name, + const elfcpp::Shdr<64, false>& shdr, + unsigned int, unsigned int, off_t*); #endif #ifdef HAVE_TARGET_64_BIG template Output_section* -Layout::layout<64, true>(Relobj* object, unsigned int shndx, const char* name, - const elfcpp::Shdr<64, true>& shdr, off_t*); +Layout::layout<64, true>(Sized_relobj<64, true>* object, unsigned int shndx, + const char* name, + const elfcpp::Shdr<64, true>& shdr, + unsigned int, unsigned int, off_t*); #endif +#ifdef HAVE_TARGET_32_LITTLE +template +Output_section* +Layout::layout_eh_frame<32, false>(Sized_relobj<32, false>* object, + const unsigned char* symbols, + off_t symbols_size, + const unsigned char* symbol_names, + off_t symbol_names_size, + unsigned int shndx, + const elfcpp::Shdr<32, false>& shdr, + unsigned int reloc_shndx, + unsigned int reloc_type, + off_t* off); +#endif + +#ifdef HAVE_TARGET_32_BIG +template +Output_section* +Layout::layout_eh_frame<32, true>(Sized_relobj<32, true>* object, + const unsigned char* symbols, + off_t symbols_size, + const unsigned char* symbol_names, + off_t symbol_names_size, + unsigned int shndx, + const elfcpp::Shdr<32, true>& shdr, + unsigned int reloc_shndx, + unsigned int reloc_type, + off_t* off); +#endif + +#ifdef HAVE_TARGET_64_LITTLE +template +Output_section* +Layout::layout_eh_frame<64, false>(Sized_relobj<64, false>* object, + const unsigned char* symbols, + off_t symbols_size, + const unsigned char* symbol_names, + off_t symbol_names_size, + unsigned int shndx, + const elfcpp::Shdr<64, false>& shdr, + unsigned int reloc_shndx, + unsigned int reloc_type, + off_t* off); +#endif + +#ifdef HAVE_TARGET_64_BIG +template +Output_section* +Layout::layout_eh_frame<64, true>(Sized_relobj<64, true>* object, + const unsigned char* symbols, + off_t symbols_size, + const unsigned char* symbol_names, + off_t symbol_names_size, + unsigned int shndx, + const elfcpp::Shdr<64, true>& shdr, + unsigned int reloc_shndx, + unsigned int reloc_type, + off_t* off); +#endif } // End namespace gold. |