upx/src/p_lx_elf.h

/* p_lx_elf.h --

   This file is part of the UPX executable compressor.

   Copyright (C) 1996-2004 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1996-2004 Laszlo Molnar
   Copyright (C) 2000-2004 John F. Reiser
   All Rights Reserved.

   UPX and the UCL library are free software; you can redistribute them
   and/or modify them under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2 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; see the file COPYING.
   If not, write to the Free Software Foundation, Inc.,
   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

   Markus F.X.J. Oberhumer   Laszlo Molnar           John F. Reiser
   markus@oberhumer.com      ml1050@cdata.tvnet.hu   jreiser@BitWagon.com
 */


#ifndef __UPX_P_LX_ELF_H  //{
#define __UPX_P_LX_ELF_H


class PackLinuxElf32 : public PackUnix
{
    typedef PackUnix super;
public:
    PackLinuxElf32(InputFile *f);
    virtual ~PackLinuxElf32();
    /*virtual int buildLoader(const Filter *);*/
    virtual bool canUnpackVersion(int version) const { return (version >= 11); }

protected:
    virtual int checkEhdr(
        Elf32_Ehdr const *ehdr,
        unsigned char e_machine,
        unsigned char ei_class,
        unsigned char ei_data) const;

    virtual const int *getCompressionMethods(int method, int level) const;

    virtual void pack1(OutputFile *, Filter &);  // generate executable header
    virtual void pack2(OutputFile *, Filter &);  // append compressed data
    //virtual void pack3(OutputFile *, Filter &);  // append loader
    virtual void pack4(OutputFile *, Filter &);  // append pack header

    virtual off_t getbrk(const Elf32_Phdr *phdr, int e_phnum) const;
    virtual void generateElfHdr(
        OutputFile *,
        void const *proto,
        unsigned const brka
    );
    virtual int buildLinuxLoader(
        upx_byte const *const proto,  // assembly-only sections
        unsigned const szproto,
        upx_byte const *const fold,  // linked assembly + C section
        unsigned const szfold,
        Filter const *ft
    );
    virtual void patchLoader();
    virtual void updateLoader(OutputFile *fo);
    virtual void unpack(OutputFile *fo);

protected:
    Elf32_Ehdr  ehdri; // from input file
    Elf32_Phdr *phdri; // for  input file
    unsigned sz_phdrs;  // sizeof Phdr[]
    unsigned sz_elf_hdrs;  // all Elf headers

    struct cprElfHdr1 {
        struct Elf32_Ehdr ehdr;
        struct Elf32_Phdr phdr[1];
        struct l_info linfo;
    }
    __attribute_packed;

    struct cprElfHdr2 {
        struct Elf32_Ehdr ehdr;
        struct Elf32_Phdr phdr[2];
        struct l_info linfo;
    }
    __attribute_packed;

    struct cprElfHdr3 {
        struct Elf32_Ehdr ehdr;
        struct Elf32_Phdr phdr[3];
        struct l_info linfo;
    }
    __attribute_packed;

    struct cprElfHdr3 elfout;
};

class PackLinuxElf32Be : public PackLinuxElf32
{
    typedef PackLinuxElf32 super;
protected:
    PackLinuxElf32Be(InputFile *f) : super(f) { }

    virtual unsigned get_native32(const void *b) const { return get_be32(b); }
    virtual unsigned get_native16(const void *b) const { return get_be16(b); }
    virtual void set_native32(void *b, unsigned v) const { set_be32(b, v); }
    virtual void set_native16(void *b, unsigned v) const { set_be16(b, v); }
};

/*************************************************************************
// linux/elf32ppc
**************************************************************************/

class PackLinuxElf32ppc : public PackLinuxElf32Be
{
    typedef PackLinuxElf32Be super;
public:
    PackLinuxElf32ppc(InputFile *f);
    virtual ~PackLinuxElf32ppc();
    virtual int getFormat() const { return UPX_F_LINUX_ELFPPC32; }
    virtual const char *getName() const { return "linux/ElfPPC"; }
    virtual const int *getFilters() const;
    virtual bool canPack();
protected:
    virtual void pack3(OutputFile *, Filter &);  // append loader
    virtual const int *getCompressionMethods(int method, int level) const;
    virtual int buildLinuxLoader(
        upx_byte const *const proto,  // assembly-only sections
        unsigned const szproto,
        upx_byte const *const fold,  // linked assembly + C section
        unsigned const szfold,
        Filter const *ft
    );
    virtual int buildLoader(const Filter *);
    virtual void generateElfHdr(
        OutputFile *,
        void const *proto,
        unsigned const brka
    );
};

/*************************************************************************
// linux/elf386
**************************************************************************/

class PackLinuxI386elf : public PackLinuxI386
{
    typedef PackLinuxI386 super;
public:
    PackLinuxI386elf(InputFile *f);
    virtual ~PackLinuxI386elf();
    virtual int getVersion() const { return 13; }
    virtual int getFormat() const { return UPX_F_LINUX_ELF_i386; }
    virtual const char *getName() const { return "linux/elf386"; }
    virtual const int *getFilters() const;
    virtual int buildLoader(const Filter *);

    virtual void unpack(OutputFile *fo);

    virtual bool canPack();
    virtual bool canUnpackVersion(int version) const
        { return (version >= 11); }

protected:
    virtual void pack1(OutputFile *, Filter &);  // generate executable header
    virtual void pack2(OutputFile *, Filter &);  // append compressed data
    virtual void pack3(OutputFile *, Filter &);  // append loader

    virtual void patchLoader();

    Elf32_Ehdr  ehdri; // from input file
    Elf32_Phdr *phdri; // for  input file
    unsigned sz_phdrs;  // sizeof Phdr[]

};


#endif /*} already included */


/*
vi:ts=4:et
*/