244 lines
6.9 KiB
C++
244 lines
6.9 KiB
C++
// nacl.h -- Native Client support for gold -*- C++ -*-
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// Copyright (C) 2012-2015 Free Software Foundation, Inc.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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#include "elfcpp_file.h"
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#include "fileread.h"
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#include "layout.h"
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#include "target-select.h"
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#include "target.h"
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#ifndef GOLD_NACL_H
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#define GOLD_NACL_H
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namespace gold
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{
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class Sniff_file
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{
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public:
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Sniff_file(Input_file* input_file, off_t offset)
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: file_(input_file->file()), offset_(offset)
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{ }
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class Location
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{
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public:
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Location(off_t file_offset, off_t data_size)
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: offset_(file_offset), size_(data_size)
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{ }
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inline off_t offset() const
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{ return this->offset_; }
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inline section_size_type size() const
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{ return this->size_; }
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private:
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off_t offset_;
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section_size_type size_;
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};
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class View
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{
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public:
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View(File_read& file, off_t file_offset, off_t data_size)
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: data_(file.get_view(file_offset, 0, data_size, true, false))
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{ }
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const unsigned char* data()
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{ return this->data_; }
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private:
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const unsigned char* data_;
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};
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View view(off_t file_offset, off_t data_size)
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{
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return View(this->file_, this->offset_ + file_offset, data_size);
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}
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View view(Location loc)
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{
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return this->view(loc.offset(), loc.size());
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}
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// Report an error.
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void
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error(const char* format, ...) const ATTRIBUTE_PRINTF_2;
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private:
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File_read& file_;
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off_t offset_;
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};
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template<class base_selector, class nacl_target>
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class Target_selector_nacl : public base_selector
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{
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public:
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Target_selector_nacl(const char* nacl_abi_name,
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const char* bfd_name, const char* emulation)
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: base_selector(), is_nacl_(false), nacl_abi_name_(nacl_abi_name),
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bfd_name_(bfd_name), emulation_(emulation)
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{ }
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protected:
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virtual Target*
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do_instantiate_target()
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{
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if (this->is_nacl_)
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return new nacl_target();
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return this->base_selector::do_instantiate_target();
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}
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virtual Target*
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do_recognize(Input_file* file, off_t offset,
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int machine, int osabi, int abiversion)
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{
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this->is_nacl_ = file != NULL && this->recognize_nacl_file(file, offset);
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if (this->is_nacl_)
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return this->instantiate_target();
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return this->base_selector::do_recognize(file, offset,
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machine, osabi, abiversion);
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}
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virtual Target*
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do_recognize_by_bfd_name(const char* name)
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{
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gold_assert(this->bfd_name_ != NULL);
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this->is_nacl_ = strcmp(name, this->bfd_name_) == 0;
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if (this->is_nacl_)
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return this->instantiate_target();
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return this->base_selector::do_recognize_by_bfd_name(name);
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}
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virtual void
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do_supported_bfd_names(std::vector<const char*>* names)
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{
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gold_assert(this->bfd_name_ != NULL);
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this->base_selector::do_supported_bfd_names(names);
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names->push_back(this->bfd_name_);
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}
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virtual void
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do_supported_emulations(std::vector<const char*>* emulations)
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{
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gold_assert(this->emulation_ != NULL);
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this->base_selector::do_supported_emulations(emulations);
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emulations->push_back(this->emulation_);
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}
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virtual const char*
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do_target_bfd_name(const Target* target)
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{
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return (!this->is_our_target(target)
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? NULL
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: (this->is_nacl_
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? this->bfd_name_
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: base_selector::do_target_bfd_name(target)));
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}
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private:
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bool
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recognize_nacl_file(Input_file* input_file, off_t offset)
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{
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if (this->is_big_endian())
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{
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#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
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# ifdef HAVE_TARGET_32_BIG
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if (this->get_size() == 32)
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return do_recognize_nacl_file<32, true>(input_file, offset);
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# endif
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# ifdef HAVE_TARGET_64_BIG
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if (this->get_size() == 64)
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return do_recognize_nacl_file<64, true>(input_file, offset);
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# endif
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#endif
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gold_unreachable();
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}
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else
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{
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#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
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# ifdef HAVE_TARGET_32_LITTLE
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if (this->get_size() == 32)
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return do_recognize_nacl_file<32, false>(input_file, offset);
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# endif
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# ifdef HAVE_TARGET_64_LITTLE
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if (this->get_size() == 64)
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return do_recognize_nacl_file<64, false>(input_file, offset);
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# endif
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#endif
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gold_unreachable();
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}
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}
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template<int size, bool big_endian>
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bool
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do_recognize_nacl_file(Input_file* input_file, off_t offset)
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{
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Sniff_file file(input_file, offset);
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elfcpp::Elf_file<size, big_endian, Sniff_file> elf_file(&file);
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const unsigned int shnum = elf_file.shnum();
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for (unsigned int shndx = 1; shndx < shnum; ++shndx)
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{
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if (elf_file.section_type(shndx) == elfcpp::SHT_NOTE)
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{
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Sniff_file::Location loc = elf_file.section_contents(shndx);
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if (loc.size() < (3 * 4
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+ align_address(sizeof "NaCl", 4)
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+ align_address(nacl_abi_name_.size() + 1, 4)))
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continue;
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Sniff_file::View view(file.view(loc));
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const unsigned char* note_data = view.data();
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if ((elfcpp::Swap<32, big_endian>::readval(note_data + 0)
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== sizeof "NaCl")
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&& (elfcpp::Swap<32, big_endian>::readval(note_data + 4)
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== nacl_abi_name_.size() + 1)
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&& (elfcpp::Swap<32, big_endian>::readval(note_data + 8)
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== elfcpp::NT_VERSION))
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{
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const unsigned char* name = note_data + 12;
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const unsigned char* desc = (name
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+ align_address(sizeof "NaCl", 4));
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if (memcmp(name, "NaCl", sizeof "NaCl") == 0
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&& memcmp(desc, nacl_abi_name_.c_str(),
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nacl_abi_name_.size() + 1) == 0)
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return true;
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}
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}
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}
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return false;
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}
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// Whether we decided this was the NaCl target variant.
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bool is_nacl_;
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// The string found in the NaCl ABI note.
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std::string nacl_abi_name_;
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// BFD name of NaCl target, for compatibility.
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const char* const bfd_name_;
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// GNU linker emulation for this NaCl target, for compatibility.
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const char* const emulation_;
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};
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} // end namespace gold
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#endif // !defined(GOLD_NACL_H)
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