elf.h

ecos实时嵌入式操作系统

#ifndef CYGONCE_LOADER_ELF_H
#define CYGONCE_LOADER_ELF_H

//==========================================================================
//
//      elf.h
//
//      ELF file format definitions
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, 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.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 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.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):           nickg
// Contributors:        nickg
// Date:                2000-11-15
// Purpose:             Define ELF file format
// Description:         The types defined here describe the ELF file format.
//              
// Usage:       #include <cyg/loader/elf.h>
//
//####DESCRIPTIONEND####
//
//==========================================================================
//
// Quite a lot of this file was taken from the BSD exec_elf.h header file.
// Hence we should show you this...
//
/*      $OpenBSD: exec_elf.h,v 1.20 1999/09/19 16:16:49 kstailey Exp $  */
/*
 * Copyright (c) 1995, 1996 Erik Theisen.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
//==========================================================================

#include <cyg/infra/cyg_type.h>

// -------------------------------------------------------------------------
// Basic types:

typedef cyg_uint32 Elf32_Addr;
typedef cyg_uint32 Elf32_Off;
typedef cyg_uint16 Elf32_Half;
typedef cyg_uint32 Elf32_Word;
typedef cyg_int32  Elf32_Sword;

typedef cyg_uint64 Elf64_Addr;
typedef cyg_uint64 Elf64_Off;
typedef cyg_uint16 Elf64_Half;
typedef cyg_uint32 Elf64_Word;
typedef cyg_int32  Elf64_Sword;
typedef cyg_uint64 Elf64_Xword;
typedef cyg_int64  Elf64_Sxword;

// -------------------------------------------------------------------------
// ELF header

#define EI_NIDENT 16

typedef struct {
    unsigned char   e_ident[EI_NIDENT];
    Elf32_Half      e_type;
    Elf32_Half      e_machine;
    Elf32_Word      e_version;
    Elf32_Addr      e_entry;
    Elf32_Off       e_phoff;
    Elf32_Off       e_shoff;
    Elf32_Word      e_flags;
    Elf32_Half      e_ehsize;
    Elf32_Half      e_phentsize;
    Elf32_Half      e_phnum;
    Elf32_Half      e_shentsize;
    Elf32_Half      e_shnum;
    Elf32_Half      e_shtrndx;
} Elf32_Ehdr;

typedef struct {
    unsigned char   e_ident[EI_NIDENT];
    Elf64_Half      e_type;
    Elf64_Half      e_machine;
    Elf64_Word      e_version;
    Elf64_Addr      e_entry;
    Elf64_Off       e_phoff;
    Elf64_Off       e_shoff;
    Elf64_Word      e_flags;
    Elf64_Half      e_ehsize;
    Elf64_Half      e_phentsize;
    Elf64_Half      e_phnum;
    Elf64_Half      e_shentsize;
    Elf64_Half      e_shnum;
    Elf64_Half      e_shtrndx;
} Elf64_Ehdr;

// -------------------------------------------------------------------------
/* e_ident[] identification indexes */

#define EI_MAG0         0               /* file ID */
#define EI_MAG1         1               /* file ID */
#define EI_MAG2         2               /* file ID */
#define EI_MAG3         3               /* file ID */
#define EI_CLASS        4               /* file class */
#define EI_DATA         5               /* data encoding */
#define EI_VERSION      6               /* ELF header version */
#define EI_OSABI        7               /* Operating system/ABI identification */
#define EI_ABIVERSION   8               /* ABI version */
#define EI_PAD          9               /* start of pad bytes */

// -------------------------------------------------------------------------
/* e_ident[] magic number */

#define ELFMAG0         0x7f            /* e_ident[EI_MAG0] */
#define ELFMAG1         'E'             /* e_ident[EI_MAG1] */
#define ELFMAG2         'L'             /* e_ident[EI_MAG2] */
#define ELFMAG3         'F'             /* e_ident[EI_MAG3] */
#define ELFMAG          "\177ELF"       /* magic */
#define SELFMAG         4               /* size of magic */

// -------------------------------------------------------------------------
/* e_ident[] file class */

#define ELFCLASSNONE    0               /* invalid */
#define ELFCLASS32      1               /* 32-bit objs */
#define ELFCLASS64      2               /* 64-bit objs */
#define ELFCLASSNUM     3               /* number of classes */

// -------------------------------------------------------------------------
/* e_ident[] data encoding */

#define ELFDATANONE     0               /* invalid */
#define ELFDATA2LSB     1               /* Little-Endian */
#define ELFDATA2MSB     2               /* Big-Endian */
#define ELFDATANUM      3               /* number of data encode defines */

// -------------------------------------------------------------------------
/* e_ident */

#define IS_ELF(ehdr) ((ehdr).e_ident[EI_MAG0] == ELFMAG0 && \
                      (ehdr).e_ident[EI_MAG1] == ELFMAG1 && \
                      (ehdr).e_ident[EI_MAG2] == ELFMAG2 && \
                      (ehdr).e_ident[EI_MAG3] == ELFMAG3)

// -------------------------------------------------------------------------
/* e_type */

#define ET_NONE         0               /* No file type */
#define ET_REL          1               /* relocatable file */
#define ET_EXEC         2               /* executable file */
#define ET_DYN          3               /* shared object file */
#define ET_CORE         4               /* core file */
#define ET_NUM          5               /* number of types */
#define ET_LOOS         0xfe00          /* Operating system-specific */
#define ET_HIOS         0xfeff          /* Operating system-specific */
#define ET_LOPROC       0xff00          /* reserved range for processor */
#define ET_HIPROC       0xffff          /*  specific e_type */

// -------------------------------------------------------------------------
/* e_machine */
// The following values taken from 22 June 2000 SysV ABI spec, updated with
// extra values from binutils elf/common.h.

#define EM_NONE                 0       // No machine
#define EM_M32                  1       // AT&T WE 32100
#define EM_SPARC                2       // SPARC
#define EM_386                  3       // Intel 80386
#define EM_68K                  4       // Motorola 68000
#define EM_88K                  5       // Motorola 88000
#define EM_860                  7       // Intel 80860
#define EM_MIPS                 8       // MIPS I Architecture
#define EM_S370                 9       // IBM System/370 Processor
#define EM_MIPS_RS3_LE          10      // MIPS RS3000 Little-endian
#define EM_PARISC               15      // Hewlett-Packard PA-RISC
#define EM_VPP500               17      // Fujitsu VPP500
#define EM_SPARC32PLUS          18      // Enhanced instruction set SPARC
#define EM_960                  19      // Intel 80960
#define EM_PPC                  20      // PowerPC
#define EM_PPC64                21      // 64-bit PowerPC
#define EM_V800                 36      // NEC V800
#define EM_FR20                 37      // Fujitsu FR20
#define EM_RH32                 38      // TRW RH-32
#define EM_RCE                  39      // Motorola RCE
#define EM_ARM                  40      // Advanced RISC Machines ARM
#define EM_ALPHA                41      // Digital Alpha