// elfcpp_file.h -- file access for elfcpp -*- C++ -*-
+// Copyright 2006, 2007, Free Software Foundation, Inc.
+// Written by Ian Lance Taylor <iant@google.com>.
+
+// This file is part of elfcpp.
+
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public License
+// as published by the Free Software Foundation; either version 2, or
+// (at your option) any later version.
+
+// In addition to the permissions in the GNU Library General Public
+// License, the Free Software Foundation gives you unlimited
+// permission to link the compiled version of this file into
+// combinations with other programs, and to distribute those
+// combinations without any restriction coming from the use of this
+// file. (The Library Public License restrictions do apply in other
+// respects; for example, they cover modification of the file, and
+/// distribution when not linked into a combined executable.)
+
+// 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
+// Library General Public License for more details.
+
+// You should have received a copy of the GNU Library 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.
+
// This header file defines the class Elf_file which can be used to
// read useful data from an ELF file. The functions here are all
// templates which take a file interface object as a parameter. This
return this->shstrndx_;
}
+ // Return the value to subtract from section indexes >=
+ // SHN_LORESERVE. See the comment in initialize_shnum.
+ int
+ large_shndx_offset()
+ {
+ this->initialize_shnum();
+ return this->large_shndx_offset_;
+ }
+
// Return the location of the header of section SHNDX.
typename File::Location
section_header(unsigned int shndx)
typename File::Location
section_contents(unsigned int shndx);
+ // Return the size of section SHNDX.
+ typename Elf_types<size>::Elf_WXword
+ section_size(unsigned int shndx);
+
// Return the flags of section SHNDX.
typename Elf_types<size>::Elf_WXword
section_flags(unsigned int shndx);
+ // Return the address of section SHNDX.
+ typename Elf_types<size>::Elf_Addr
+ section_addr(unsigned int shndx);
+
+ // Return the type of section SHNDX.
+ Elf_Word
+ section_type(unsigned int shndx);
+
+ // Return the link field of section SHNDX.
+ Elf_Word
+ section_link(unsigned int shndx);
+
+ // Return the info field of section SHNDX.
+ Elf_Word
+ section_info(unsigned int shndx);
+
+ // Return the addralign field of section SHNDX.
+ typename Elf_types<size>::Elf_WXword
+ section_addralign(unsigned int shndx);
+
private:
// Shared constructor code.
void
unsigned int shnum_;
// The section index of the section name string table.
unsigned int shstrndx_;
+ // Offset to add to sections larger than SHN_LORESERVE.
+ int large_shndx_offset_;
};
// Template function definitions.
this->shoff_ = ehdr.get_e_shoff();
this->shnum_ = ehdr.get_e_shnum();
this->shstrndx_ = ehdr.get_e_shstrndx();
+ this->large_shndx_offset_ = 0;
if (ehdr.get_e_ehsize() != This::ehdr_size)
file->error(_("bad e_ehsize (%d != %d)"),
ehdr.get_e_ehsize(), This::ehdr_size);
{
typename File::View v(this->file_->view(this->shoff_, This::shdr_size));
Ef_shdr shdr(v.data());
+
if (this->shnum_ == 0)
this->shnum_ = shdr.get_sh_size();
+
if (this->shstrndx_ == SHN_XINDEX)
- this->shstrndx_ = shdr.get_sh_link();
+ {
+ this->shstrndx_ = shdr.get_sh_link();
+
+ // Versions of the GNU binutils between 2.12 and 2.18 did
+ // not handle objects with more than SHN_LORESERVE sections
+ // correctly. All large section indexes were offset by
+ // 0x100. Some information can be found here:
+ // http://sourceware.org/bugzilla/show_bug.cgi?id=5900 .
+ // Fortunately these object files are easy to detect, as the
+ // GNU binutils always put the section header string table
+ // near the end of the list of sections. Thus if the
+ // section header string table index is larger than the
+ // number of sections, then we know we have to subtract
+ // 0x100 to get the real section index.
+ if (this->shstrndx_ >= this->shnum_)
+ {
+ if (this->shstrndx_ >= elfcpp::SHN_LORESERVE + 0x100)
+ {
+ this->large_shndx_offset_ = - 0x100;
+ this->shstrndx_ -= 0x100;
+ }
+ if (this->shstrndx_ >= this->shnum_)
+ this->file_->error(_("bad shstrndx: %u >= %u"),
+ this->shstrndx_, this->shnum_);
+ }
+ }
}
}
return typename File::Location(shdr.get_sh_offset(), shdr.get_sh_size());
}
+// Get the size of section SHNDX.
+
+template<int size, bool big_endian, typename File>
+typename Elf_types<size>::Elf_WXword
+Elf_file<size, big_endian, File>::section_size(unsigned int shndx)
+{
+ File* const file = this->file_;
+
+ if (shndx >= this->shnum())
+ file->error(_("section_size: bad shndx %u >= %u"),
+ shndx, this->shnum());
+
+ typename File::View v(file->view(this->section_header_offset(shndx),
+ This::shdr_size));
+
+ Ef_shdr shdr(v.data());
+ return shdr.get_sh_size();
+}
+
// Return the section flags of section SHNDX.
template<int size, bool big_endian, typename File>
return shdr.get_sh_flags();
}
+// Return the address of section SHNDX.
+
+template<int size, bool big_endian, typename File>
+typename Elf_types<size>::Elf_Addr
+Elf_file<size, big_endian, File>::section_addr(unsigned int shndx)
+{
+ File* const file = this->file_;
+
+ if (shndx >= this->shnum())
+ file->error(_("section_flags: bad shndx %u >= %u"),
+ shndx, this->shnum());
+
+ typename File::View v(file->view(this->section_header_offset(shndx),
+ This::shdr_size));
+
+ Ef_shdr shdr(v.data());
+ return shdr.get_sh_addr();
+}
+
+// Return the type of section SHNDX.
+
+template<int size, bool big_endian, typename File>
+Elf_Word
+Elf_file<size, big_endian, File>::section_type(unsigned int shndx)
+{
+ File* const file = this->file_;
+
+ if (shndx >= this->shnum())
+ file->error(_("section_type: bad shndx %u >= %u"),
+ shndx, this->shnum());
+
+ typename File::View v(file->view(this->section_header_offset(shndx),
+ This::shdr_size));
+
+ Ef_shdr shdr(v.data());
+ return shdr.get_sh_type();
+}
+
+// Return the sh_link field of section SHNDX.
+
+template<int size, bool big_endian, typename File>
+Elf_Word
+Elf_file<size, big_endian, File>::section_link(unsigned int shndx)
+{
+ File* const file = this->file_;
+
+ if (shndx >= this->shnum())
+ file->error(_("section_link: bad shndx %u >= %u"),
+ shndx, this->shnum());
+
+ typename File::View v(file->view(this->section_header_offset(shndx),
+ This::shdr_size));
+
+ Ef_shdr shdr(v.data());
+ return shdr.get_sh_link();
+}
+
+// Return the sh_info field of section SHNDX.
+
+template<int size, bool big_endian, typename File>
+Elf_Word
+Elf_file<size, big_endian, File>::section_info(unsigned int shndx)
+{
+ File* const file = this->file_;
+
+ if (shndx >= this->shnum())
+ file->error(_("section_info: bad shndx %u >= %u"),
+ shndx, this->shnum());
+
+ typename File::View v(file->view(this->section_header_offset(shndx),
+ This::shdr_size));
+
+ Ef_shdr shdr(v.data());
+ return shdr.get_sh_info();
+}
+
+// Return the sh_addralign field of section SHNDX.
+
+template<int size, bool big_endian, typename File>
+typename Elf_types<size>::Elf_WXword
+Elf_file<size, big_endian, File>::section_addralign(unsigned int shndx)
+{
+ File* const file = this->file_;
+
+ if (shndx >= this->shnum())
+ file->error(_("section_addralign: bad shndx %u >= %u"),
+ shndx, this->shnum());
+
+ typename File::View v(file->view(this->section_header_offset(shndx),
+ This::shdr_size));
+
+ Ef_shdr shdr(v.data());
+ return shdr.get_sh_addralign();
+}
+
} // End namespace elfcpp.
#endif // !defined(ELFCPP_FILE_H)
projects / deliverable / binutils-gdb.git / blobdiff