370 lines
11 KiB
C++
370 lines
11 KiB
C++
// binary.cc -- binary input files for gold
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// Copyright (C) 2008-2022 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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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 "gold.h"
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#include <cerrno>
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#include <cstring>
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#include "elfcpp.h"
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#include "stringpool.h"
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#include "fileread.h"
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#include "output.h"
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#include "binary.h"
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// safe-ctype.h interferes with macros defined by the system <ctype.h>.
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// Some C++ system headers might include <ctype.h> and rely on its macro
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// definitions being intact. So make sure that safe-ctype.h is included
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// only after any C++ system headers, whether directly here (above) or via
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// other local header files (e.g. #include <string> in "binary.h").
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#include "safe-ctype.h"
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// Support for reading binary files as input. These become blobs in
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// the final output. These files are treated as though they have a
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// single .data section and define three symbols:
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// _binary_FILENAME_start, _binary_FILENAME_end, _binary_FILENAME_size.
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// The FILENAME is the name of the input file, with any
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// non-alphanumeric character changed to an underscore.
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// We implement this by creating an ELF file in memory.
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namespace gold
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{
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// class Binary_to_elf.
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Binary_to_elf::Binary_to_elf(elfcpp::EM machine, int size, bool big_endian,
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const std::string& filename)
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: elf_machine_(machine), size_(size), big_endian_(big_endian),
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filename_(filename), data_(NULL), filesize_(0)
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{
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}
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Binary_to_elf::~Binary_to_elf()
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{
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if (this->data_ != NULL)
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delete[] this->data_;
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}
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// Given FILENAME, create a buffer which looks like an ELF file with
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// the contents of FILENAME as the contents of the only section. The
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// TASK parameters is mainly for debugging, and records who holds
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// locks.
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bool
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Binary_to_elf::convert(const Task* task)
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{
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if (this->size_ == 32)
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{
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if (!this->big_endian_)
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{
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#ifdef HAVE_TARGET_32_LITTLE
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return this->sized_convert<32, false>(task);
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#else
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gold_unreachable();
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#endif
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}
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else
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{
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#ifdef HAVE_TARGET_32_BIG
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return this->sized_convert<32, true>(task);
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#else
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gold_unreachable();
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#endif
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}
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}
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else if (this->size_ == 64)
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{
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if (!this->big_endian_)
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{
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#ifdef HAVE_TARGET_64_LITTLE
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return this->sized_convert<64, false>(task);
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#else
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gold_unreachable();
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#endif
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}
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else
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{
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#ifdef HAVE_TARGET_64_BIG
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return this->sized_convert<64, true>(task);
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#else
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gold_unreachable();
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#endif
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}
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}
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else
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gold_unreachable();
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}
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// We are going to create:
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// * The ELF file header.
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// * Five sections: null section, .data, .symtab, .strtab, .shstrtab
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// * The contents of the file.
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// * Four symbols: null, begin, end, size.
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// * Three symbol names.
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// * Four section names.
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template<int size, bool big_endian>
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bool
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Binary_to_elf::sized_convert(const Task* task)
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{
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// Read the input file.
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File_read f;
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if (!f.open(task, this->filename_))
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{
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gold_error(_("cannot open %s: %s:"), this->filename_.c_str(),
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strerror(errno));
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return false;
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}
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section_size_type filesize = convert_to_section_size_type(f.filesize());
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const unsigned char* fileview;
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if (filesize == 0)
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fileview = NULL;
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else
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fileview = f.get_view(0, 0, filesize, false, false);
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unsigned int align;
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if (size == 32)
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align = 4;
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else if (size == 64)
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align = 8;
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else
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gold_unreachable();
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section_size_type aligned_filesize = align_address(filesize, align);
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// Build the stringpool for the symbol table.
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std::string mangled_name = this->filename_;
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for (std::string::iterator p = mangled_name.begin();
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p != mangled_name.end();
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++p)
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if (!ISALNUM(*p))
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*p = '_';
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mangled_name = "_binary_" + mangled_name;
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std::string start_symbol_name = mangled_name + "_start";
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std::string end_symbol_name = mangled_name + "_end";
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std::string size_symbol_name = mangled_name + "_size";
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Stringpool strtab;
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strtab.add(start_symbol_name.c_str(), false, NULL);
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strtab.add(end_symbol_name.c_str(), false, NULL);
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strtab.add(size_symbol_name.c_str(), false, NULL);
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strtab.set_string_offsets();
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// Build the stringpool for the section name table.
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Stringpool shstrtab;
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shstrtab.add(".data", false, NULL);
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shstrtab.add(".symtab", false, NULL);
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shstrtab.add(".strtab", false, NULL);
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shstrtab.add(".shstrtab", false, NULL);
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shstrtab.set_string_offsets();
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// Work out the size of the generated file, and the offsets of the
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// various sections, and allocate a buffer.
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const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
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size_t output_size = (elfcpp::Elf_sizes<size>::ehdr_size
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+ 5 * elfcpp::Elf_sizes<size>::shdr_size);
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size_t data_offset = output_size;
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output_size += aligned_filesize;
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size_t symtab_offset = output_size;
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output_size += 4 * sym_size;
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size_t strtab_offset = output_size;
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output_size += strtab.get_strtab_size();
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size_t shstrtab_offset = output_size;
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output_size += shstrtab.get_strtab_size();
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unsigned char* buffer = new unsigned char[output_size];
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// Write out the data.
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unsigned char* pout = buffer;
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this->write_file_header<size, big_endian>(&pout);
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this->write_section_header<size, big_endian>("", &shstrtab, elfcpp::SHT_NULL,
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0, 0, 0, 0, 0,
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0, 0, &pout);
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// Having the section be named ".data", having it be writable, and
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// giving it an alignment of 1 is because the GNU linker does it
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// that way, and existing linker script expect it.
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this->write_section_header<size, big_endian>(".data", &shstrtab,
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elfcpp::SHT_PROGBITS,
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(elfcpp::SHF_ALLOC
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| elfcpp::SHF_WRITE),
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data_offset,
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filesize, 0, 0,
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1, 0, &pout);
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this->write_section_header<size, big_endian>(".symtab", &shstrtab,
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elfcpp::SHT_SYMTAB,
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0, symtab_offset, 4 * sym_size,
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3, 1, align, sym_size, &pout);
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this->write_section_header<size, big_endian>(".strtab", &shstrtab,
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elfcpp::SHT_STRTAB,
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0, strtab_offset,
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strtab.get_strtab_size(),
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0, 0, 1, 0, &pout);
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this->write_section_header<size, big_endian>(".shstrtab", &shstrtab,
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elfcpp::SHT_STRTAB,
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0, shstrtab_offset,
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shstrtab.get_strtab_size(),
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0, 0, 1, 0, &pout);
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if (filesize > 0)
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{
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memcpy(pout, fileview, filesize);
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pout += filesize;
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memset(pout, 0, aligned_filesize - filesize);
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pout += aligned_filesize - filesize;
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}
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this->write_symbol<size, big_endian>("", &strtab, 0, 0, 0, &pout);
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this->write_symbol<size, big_endian>(start_symbol_name, &strtab, 0, filesize,
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1, &pout);
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this->write_symbol<size, big_endian>(end_symbol_name, &strtab, filesize, 0,
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1, &pout);
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this->write_symbol<size, big_endian>(size_symbol_name, &strtab, filesize, 0,
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elfcpp::SHN_ABS, &pout);
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strtab.write_to_buffer(pout, strtab.get_strtab_size());
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pout += strtab.get_strtab_size();
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shstrtab.write_to_buffer(pout, shstrtab.get_strtab_size());
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pout += shstrtab.get_strtab_size();
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gold_assert(static_cast<size_t>(pout - buffer) == output_size);
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this->data_ = buffer;
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this->filesize_ = output_size;
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f.unlock(task);
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return true;
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}
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// Write out the file header.
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template<int size, bool big_endian>
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void
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Binary_to_elf::write_file_header(unsigned char** ppout)
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{
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elfcpp::Ehdr_write<size, big_endian> oehdr(*ppout);
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unsigned char e_ident[elfcpp::EI_NIDENT];
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memset(e_ident, 0, elfcpp::EI_NIDENT);
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e_ident[elfcpp::EI_MAG0] = elfcpp::ELFMAG0;
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e_ident[elfcpp::EI_MAG1] = elfcpp::ELFMAG1;
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e_ident[elfcpp::EI_MAG2] = elfcpp::ELFMAG2;
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e_ident[elfcpp::EI_MAG3] = elfcpp::ELFMAG3;
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if (size == 32)
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e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS32;
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else if (size == 64)
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e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS64;
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else
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gold_unreachable();
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e_ident[elfcpp::EI_DATA] = (big_endian
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? elfcpp::ELFDATA2MSB
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: elfcpp::ELFDATA2LSB);
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e_ident[elfcpp::EI_VERSION] = elfcpp::EV_CURRENT;
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oehdr.put_e_ident(e_ident);
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oehdr.put_e_type(elfcpp::ET_REL);
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oehdr.put_e_machine(this->elf_machine_);
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oehdr.put_e_version(elfcpp::EV_CURRENT);
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oehdr.put_e_entry(0);
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oehdr.put_e_phoff(0);
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oehdr.put_e_shoff(elfcpp::Elf_sizes<size>::ehdr_size);
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oehdr.put_e_flags(0);
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oehdr.put_e_ehsize(elfcpp::Elf_sizes<size>::ehdr_size);
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oehdr.put_e_phentsize(0);
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oehdr.put_e_phnum(0);
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oehdr.put_e_shentsize(elfcpp::Elf_sizes<size>::shdr_size);
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oehdr.put_e_shnum(5);
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oehdr.put_e_shstrndx(4);
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*ppout += elfcpp::Elf_sizes<size>::ehdr_size;
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}
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// Write out a section header.
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template<int size, bool big_endian>
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void
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Binary_to_elf::write_section_header(
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const char* name,
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const Stringpool* shstrtab,
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elfcpp::SHT type,
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unsigned int flags,
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section_size_type offset,
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section_size_type section_size,
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unsigned int link,
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unsigned int info,
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unsigned int addralign,
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unsigned int entsize,
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unsigned char** ppout)
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{
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elfcpp::Shdr_write<size, big_endian> oshdr(*ppout);
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oshdr.put_sh_name(*name == '\0' ? 0 : shstrtab->get_offset(name));
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oshdr.put_sh_type(type);
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oshdr.put_sh_flags(flags);
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oshdr.put_sh_addr(0);
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oshdr.put_sh_offset(offset);
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oshdr.put_sh_size(section_size);
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oshdr.put_sh_link(link);
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oshdr.put_sh_info(info);
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oshdr.put_sh_addralign(addralign);
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oshdr.put_sh_entsize(entsize);
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*ppout += elfcpp::Elf_sizes<size>::shdr_size;
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}
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// Write out a symbol.
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template<int size, bool big_endian>
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void
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Binary_to_elf::write_symbol(
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const std::string& name,
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const Stringpool* strtab,
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section_size_type value,
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typename elfcpp::Elf_types<32>::Elf_WXword st_size,
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unsigned int shndx,
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unsigned char** ppout)
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{
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unsigned char* pout = *ppout;
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elfcpp::Sym_write<size, big_endian> osym(pout);
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osym.put_st_name(name.empty() ? 0 : strtab->get_offset(name.c_str()));
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osym.put_st_value(value);
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osym.put_st_size(st_size);
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osym.put_st_info(name.empty() ? elfcpp::STB_LOCAL : elfcpp::STB_GLOBAL,
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elfcpp::STT_NOTYPE);
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osym.put_st_other(elfcpp::STV_DEFAULT, 0);
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osym.put_st_shndx(shndx);
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*ppout += elfcpp::Elf_sizes<size>::sym_size;
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}
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} // End namespace gold.
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