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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####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later
// version.
//
// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####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
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