bintools/checklib/object/elf/elf_file_header.cpp
author Zheng Shen <zheng.shen@nokia.com>
Thu, 09 Sep 2010 19:09:10 +0800
changeset 633 a4eca1f021ac
parent 0 044383f39525
permissions -rw-r--r--
ROMTools-13.1.0.2 Bug 3415 - SBS failing to build open C libraries
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// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#include "elf_file_header.h"
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#include <stdexcept>
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#include <string>
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namespace elf
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{
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    File_header::File_header(const char* p1, const char* p2, bool a_pedantic)
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        : m_data( reinterpret_cast<const Elf32_Ehdr*>(p1) )
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    {
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        if ( p1 + sizeof(Elf32_Ehdr) > p2 )
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        {
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            throw std::runtime_error("not an ELF object; file too small");
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        }
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        uint8_t m0 = m_data->e_ident[0];
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        uint8_t m1 = m_data->e_ident[1];
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        uint8_t m2 = m_data->e_ident[2];
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        uint8_t m3 = m_data->e_ident[3];
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        if (m0 != 0x7f || m1 != 'E' || m2 != 'L' || m3 != 'F')
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        {
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            throw std::runtime_error("not an ELF object; bad magic");
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        }
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        if (a_pedantic) // Do some extra checks for correctness.
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        {
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            //if (m_data->e_ident[4] != 1)
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            //{
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            //    throw std::runtime_error("invalid class; this program can only handle 32-bit objects");
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            //}
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            //if (m_data->e_ident[5] != 1)
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            //{
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            //    throw std::runtime_error("invalid encoding; this program can only handle little-endian objects");
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            //}
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            //for (unsigned i = EI_PAD; i < sizeof(m_data->e_ident); ++i)
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            //{
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            //    if (m_data->e_ident[i] != 0)
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            //    {
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            //        throw std::runtime_error("non-zero pading");
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            //    }
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            //}
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            //if (m_data->e_type == ET_NONE)
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            //{
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            //    throw std::runtime_error("invalid type");
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            //}
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            //if (m_data->e_phoff == 0 && m_data->e_shoff == 0)
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            //{
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            //    throw std::runtime_error("no program headers and no section headers");
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            //}
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            //if ( m_data->e_phoff + m_data->e_phentsize * m_data->e_phnum > p2 - p1 + 1 )
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            //{
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            //    throw std::runtime_error("file too small for header table");
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            //}
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            //if (m_data->e_shoff + m_data->e_shentsize * m_data->e_shnum > a_mem.get_size() )
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            //{
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            //    throw std::runtime_error("file too small for header table");
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            //}
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            //if ( m_data->e_shentsize != sizeof(Elf32_Shdr) )
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            //{
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            //    throw std::runtime_error("e_shentsize doesn't match the actual size of the type");
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            //}
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            //if (m_data->e_shoff > 0 && m_data->e_shnum == 0)
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            //{
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            //    throw std::runtime_error("this program can't handle the combination e_shoff > 0 and e_shnum == 0");
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            //}
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            //if (m_data->e_shstrndx >= 0xff00)
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            //{
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            //    throw std::runtime_error("this program can only handle e_shstrndx < 0xff00");
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            //}
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        } // if (a_pedantic)
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    }
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    // The following functions are obvious candidates for inlining ...
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    // e_type
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    bool File_header::is_type_rel() const
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    {
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        return (m_data->e_type == ET_REL);
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    }
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    bool File_header::is_type_exec() const
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    {
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        return (m_data->e_type == ET_EXEC);
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    }
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    bool File_header::is_type_dyn() const
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    {
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        return (m_data->e_type == ET_DYN);
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    }
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    // e_machine
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    bool File_header::is_machine_none() const
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    {
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        return (m_data->e_machine == EM_NONE);
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    }
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    bool File_header::is_machine_arm() const
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    {
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        return (m_data->e_machine == EM_ARM);
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    }
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    bool File_header::is_machine_386() const
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    {
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        return (m_data->e_machine == EM_386);
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    }
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    uint32_t File_header::get_entry() const
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    {
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        return m_data->e_entry;
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    }
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    uint32_t File_header::get_phoff() const
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    {
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        return m_data->e_phoff;
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    }
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    uint32_t File_header::get_shoff() const
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    {
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        return m_data->e_shoff;
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    }
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    uint32_t File_header::get_flags() const
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    {
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        return m_data->e_flags;
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    }
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    uint16_t File_header::get_ehsize() const
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    {
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        return m_data->e_ehsize;
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    }
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    uint16_t File_header::get_phentsize() const
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    {
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        return m_data->e_phentsize;
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    }
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    uint16_t File_header::get_phnum() const
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    {
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        return m_data->e_phnum;
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    }
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    uint16_t File_header::get_shentsize() const
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    {
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        return m_data->e_shentsize;
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    }
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    uint16_t File_header::get_shnum() const
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    {
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        return m_data->e_shnum;
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    }
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    uint16_t File_header::get_shstrndx() const
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    {
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        return m_data->e_shstrndx;
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    }
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} // namespace elf
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