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Diffstat (limited to 'gold/nacl.h')
| -rw-r--r-- | gold/nacl.h | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/gold/nacl.h b/gold/nacl.h new file mode 100644 index 0000000..bf5853d --- /dev/null +++ b/gold/nacl.h @@ -0,0 +1,243 @@ +// nacl.h -- Native Client support for gold -*- C++ -*- + +// Copyright 2012 Free Software Foundation, Inc. + +// This file is part of gold. + +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 3 of the License, or +// (at your option) any later version. + +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, +// MA 02110-1301, USA. + +#include "elfcpp_file.h" +#include "fileread.h" +#include "layout.h" +#include "target-select.h" +#include "target.h" + +#ifndef GOLD_NACL_H +#define GOLD_NACL_H + +namespace gold +{ + +class Sniff_file +{ + public: + Sniff_file(Input_file* input_file, off_t offset) + : file_(input_file->file()), offset_(offset) + { } + + class Location + { + public: + Location(off_t file_offset, off_t data_size) + : offset_(file_offset), size_(data_size) + { } + + inline off_t offset() const + { return this->offset_; } + + inline section_size_type size() const + { return this->size_; } + + private: + off_t offset_; + section_size_type size_; + }; + + class View + { + public: + View(File_read& file, off_t file_offset, off_t data_size) + : data_(file.get_view(0, file_offset, data_size, false, false)) + { } + + const unsigned char* data() + { return this->data_; } + + private: + const unsigned char* data_; + }; + + View view(off_t file_offset, off_t data_size) + { + return View(this->file_, this->offset_ + file_offset, data_size); + } + + View view(Location loc) + { + return this->view(loc.offset(), loc.size()); + } + + // Report an error. + void + error(const char* format, ...) const ATTRIBUTE_PRINTF_2; + + private: + File_read& file_; + off_t offset_; +}; + + +template<class base_selector, class nacl_target> +class Target_selector_nacl : public base_selector +{ + public: + Target_selector_nacl(const char* nacl_abi_name, + const char* bfd_name, const char* emulation) + : base_selector(), is_nacl_(false), nacl_abi_name_(nacl_abi_name), + bfd_name_(bfd_name), emulation_(emulation) + { } + + protected: + virtual Target* + do_instantiate_target() + { + if (this->is_nacl_) + return new nacl_target(); + return this->base_selector::do_instantiate_target(); + } + + virtual Target* + do_recognize(Input_file* file, off_t offset, + int machine, int osabi, int abiversion) + { + this->is_nacl_ = file != NULL && this->recognize_nacl_file(file, offset); + if (this->is_nacl_) + return this->instantiate_target(); + return this->base_selector::do_recognize(file, offset, + machine, osabi, abiversion); + } + + virtual Target* + do_recognize_by_bfd_name(const char* name) + { + gold_assert(this->bfd_name_ != NULL); + this->is_nacl_ = strcmp(name, this->bfd_name_) == 0; + if (this->is_nacl_) + return this->instantiate_target(); + return this->base_selector::do_recognize_by_bfd_name(name); + } + + virtual void + do_supported_bfd_names(std::vector<const char*>* names) + { + gold_assert(this->bfd_name_ != NULL); + this->base_selector::do_supported_bfd_names(names); + names->push_back(this->bfd_name_); + } + + virtual void + do_supported_emulations(std::vector<const char*>* emulations) + { + gold_assert(this->emulation_ != NULL); + this->base_selector::do_supported_emulations(emulations); + emulations->push_back(this->emulation_); + } + + virtual const char* + do_target_bfd_name(const Target* target) + { + return (!this->is_our_target(target) + ? NULL + : (this->is_nacl_ + ? this->bfd_name_ + : base_selector::do_target_bfd_name(target))); + } + + private: + bool + recognize_nacl_file(Input_file* input_file, off_t offset) + { + if (this->is_big_endian()) + { +#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) +# ifdef HAVE_TARGET_32_BIG + if (this->get_size() == 32) + return do_recognize_nacl_file<32, true>(input_file, offset); +# endif +# ifdef HAVE_TARGET_64_BIG + if (this->get_size() == 64) + return do_recognize_nacl_file<64, true>(input_file, offset); +# endif +#endif + gold_unreachable(); + } + else + { +#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) +# ifdef HAVE_TARGET_32_LITTLE + if (this->get_size() == 32) + return do_recognize_nacl_file<32, false>(input_file, offset); +# endif +# ifdef HAVE_TARGET_64_LITTLE + if (this->get_size() == 64) + return do_recognize_nacl_file<64, false>(input_file, offset); +# endif +#endif + gold_unreachable(); + } + } + + template<int size, bool big_endian> + bool + do_recognize_nacl_file(Input_file* input_file, off_t offset) + { + Sniff_file file(input_file, offset); + elfcpp::Elf_file<size, big_endian, Sniff_file> elf_file(&file); + const unsigned int shnum = elf_file.shnum(); + for (unsigned int shndx = 1; shndx < shnum; ++shndx) + { + if (elf_file.section_type(shndx) == elfcpp::SHT_NOTE) + { + Sniff_file::Location loc = elf_file.section_contents(shndx); + if (loc.size() < (3 * 4 + + align_address(sizeof "NaCl", 4) + + align_address(nacl_abi_name_.size() + 1, 4))) + continue; + Sniff_file::View view(file.view(loc)); + const unsigned char* note_data = view.data(); + if ((elfcpp::Swap<32, big_endian>::readval(note_data + 0) + == sizeof "NaCl") + && (elfcpp::Swap<32, big_endian>::readval(note_data + 4) + == nacl_abi_name_.size() + 1) + && (elfcpp::Swap<32, big_endian>::readval(note_data + 8) + == elfcpp::NT_VERSION)) + { + const unsigned char* name = note_data + 12; + const unsigned char* desc = (name + + align_address(sizeof "NaCl", 4)); + if (memcmp(name, "NaCl", sizeof "NaCl") == 0 + && memcmp(desc, nacl_abi_name_.c_str(), + nacl_abi_name_.size() + 1) == 0) + return true; + } + } + } + return false; + } + + // Whether we decided this was the NaCl target variant. + bool is_nacl_; + // The string found in the NaCl ABI note. + std::string nacl_abi_name_; + // BFD name of NaCl target, for compatibility. + const char* const bfd_name_; + // GNU linker emulation for this NaCl target, for compatibility. + const char* const emulation_; +}; + +} // end namespace gold + +#endif // !defined(GOLD_NACL_H) |