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#ifndef CYGONCE_LOADER_I386_ELF_H

#define CYGONCE_LOADER_I386_ELF_H

//==========================================================================

//

//      i386_elf.h

//

//      I386 specific ELF file format support

//

//==========================================================================

// ####ECOSGPLCOPYRIGHTBEGIN####                                            

// -------------------------------------------                              

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//

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// for more details.                                                        

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//

// As a special exception, if other files instantiate templates or use      

// macros or inline functions from this file, or you compile this file      

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// ####ECOSGPLCOPYRIGHTEND####                                              

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    nickg

// Contributors: nickg

// Date:         2000-11-20

// Purpose:      Define I386 ELF support

// Description:  This file contains definitions for configuring the dynamic

//               loader to deal with the I386 specific parts of the ELF

//               file format.

//              

// Usage:

//              #include <cyg/loader/i386_elf.h>

//              ...

//              

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include <pkgconf/system.h>

#include <pkgconf/hal.h>

#if defined(CYGPKG_HAL_I386)

#ifndef CYG_LOADER_DYNAMIC_LD

#include <cyg/infra/cyg_type.h>

//--------------------------------------------------------------------------

// Basic definitions

#define CYG_ELF_MACHINE     EM_386

//--------------------------------------------------------------------------

// Relocation types

// Taken from bfd/include/elf/i386.h - not currently sure which of these

// are actually used in executables.

#define R_386_NONE              0       /* No reloc */

#define R_386_32                1       /* Direct 32 bit  */

#define R_386_PC32              2       /* PC relative 32 bit */

#define R_386_GOT32             3       /* 32 bit GOT entry */

#define R_386_PLT32             4       /* 32 bit PLT address */

#define R_386_COPY              5       /* Copy symbol at runtime */

#define R_386_GLOB_DAT          6       /* Create GOT entry */

#define R_386_JUMP_SLOT         7       /* Create PLT entry */

#define R_386_RELATIVE          8       /* Adjust by program base */

#define R_386_GOTOFF            9       /* 32 bit offset to GOT */

#define R_386_GOTPC             10      /* 32 bit PC relative offset to GOT */

#define R_386_16                20

#define R_386_PC16              21

#define R_386_8                 22

#define R_386_PC8               23

#define R_386_max               24

     /* These are GNU extensions to enable C++ vtable garbage collection.  */

#define R_386_GNU_VTINHERIT     250

#define R_386_GNU_VTENTRY       251

//--------------------------------------------------------------------------

// Processor specific customization class for Cyg_LoadObject class.

#ifdef __cplusplus

class Cyg_LoadObject_Proc :

      public Cyg_LoadObject_Base

{

 public:

    inline Cyg_LoadObject_Proc()

        : Cyg_LoadObject_Base()

        {

        };

    inline Cyg_LoadObject_Proc( Cyg_LoaderStream& stream,

                    cyg_uint32 mode,

                    Cyg_LoaderMemAlloc *mem )

        : Cyg_LoadObject_Base( stream, mode, mem )

        {

        };

    inline ~Cyg_LoadObject_Proc() {};

    cyg_code apply_rel( unsigned char type, Elf32_Word sym, Elf32_Addr offset );

    cyg_code apply_rela( unsigned char type, Elf32_Word sym,

                         Elf32_Addr offset, Elf32_Sword addend );

};

//--------------------------------------------------------------------------

inline cyg_code Cyg_LoadObject_Proc::apply_rel( unsigned char type,

                                                Elf32_Word sym,

                                                Elf32_Addr offset )

{

    CYG_ADDRESS addr = (CYG_ADDRESS)(offset + base);

    CYG_ADDRESS saddr = CYG_LOADER_NULLSYMADDR;

    switch( type )

    {

    case R_386_32:                          /* Direct 32 bit  */

        saddr = get_sym_addr_from_ix(sym);

        if( saddr == CYG_LOADER_NULLSYMADDR )

            return CYG_LOADERR_NO_SYMBOL;

        *(CYG_WORD32 *)addr += saddr;

        break;

    case R_386_PC32:                        /* PC relative 32 bit */

        saddr = get_sym_addr_from_ix(sym);

        if( saddr == CYG_LOADER_NULLSYMADDR )

            return CYG_LOADERR_NO_SYMBOL;

        *(CYG_WORD32 *)addr += saddr;

        *(CYG_WORD32 *)addr -= (CYG_WORD32)addr;

        break;

    case R_386_GOT32:                       /* 32 bit GOT entry */

    case R_386_PLT32:                       /* 32 bit PLT address */

    case R_386_COPY:                        /* Copy symbol at runtime */

    case R_386_GLOB_DAT:                    /* Create GOT entry */

    case R_386_JUMP_SLOT:                   /* Create PLT entry */

        return CYG_LOADERR_INVALID_RELOC;

    case R_386_RELATIVE:                    /* Adjust by program base */

        *(CYG_WORD32 *)addr += base;

        break;

    case R_386_GOTOFF:                      /* 32 bit offset to GOT */

    case R_386_GOTPC:                       /* 32 bit PC relative offset to GOT */

    case R_386_16:

    case R_386_PC16:

    case R_386_8:

    case R_386_PC8:

    default:

        return CYG_LOADERR_INVALID_RELOC;

    }

    return 0;

}

inline cyg_code Cyg_LoadObject_Proc::apply_rela( unsigned char type,

                                                 Elf32_Word sym,

                                                 Elf32_Addr offset,

                                                 Elf32_Sword addend )

{

    // No RELA relocs in i386

    return CYG_LOADERR_INVALID_RELOC;

}

//--------------------------------------------------------------------------

#endif // __cplusplus

#else // CYG_LOADER_DYNAMIC_LD

//--------------------------------------------------------------------------

#define CYG_LOADER_DYNAMIC_PREFIX                                               \

        OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")     \

        OUTPUT_ARCH("i386")

/* Adjust the address for the data segment.  We want to adjust up to

   the same address within the page on the next page up.  */

#define CYG_LOADER_DYNAMIC_DATA_ALIGN                   \

        . = ALIGN(0x1000) + (. & (0x1000 - 1));

//--------------------------------------------------------------------------

#endif // CYG_LOADER_DYNAMIC_LD

#endif // defined(CYGPKG_HAL_I386) && __cplusplus

//--------------------------------------------------------------------------

#endif // ifndef CYGONCE_LOADER_I386_ELF_H

// End of i386_elf.h