ports/glibc-compat/include/elf32.h

/*
 * Copyright (c) 2011 The Native Client Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

/* @file
 *
 * Minimal ELF header declaration / constants for Elf32* values.
 * Constants are defined only for fields that are actualy
 * used.  (Unused constants for used fields are include only for
 * "completeness", though of course in many cases there are more
 * values in use, e.g., the EM_* values for e_machine.)
 *
 * (Re)Created from the ELF specification at
 * http://x86.ddj.com/ftp/manuals/tools/elf.pdf which is referenced
 * from wikipedia article
 * http://en.wikipedia.org/wki/Executable_and_Linkable_Format
 */

/*-
 * Copyright (c) 1996-1998 John D. Polstra.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
 *
 * $FreeBSD: src/sys/sys/elf32.h,v 1.13 2006/10/17 05:43:30 jkoshy Exp $
 */
#ifndef NATIVE_CLIENT_SRC_INCLUDE_ELF32_H_
#define NATIVE_CLIENT_SRC_INCLUDE_ELF32_H_

#include "elf_constants.h"

EXTERN_C_BEGIN

/* assumes 32-bit int, 16-bit short, 8-bit char */

/* Define 32-bit specific types */
typedef uint32_t    Elf32_Addr;   /* alignment 4 */
typedef uint16_t    Elf32_Half;   /* alignment 2 */
typedef uint32_t    Elf32_Off;    /* alignment 4 */
typedef int32_t     Elf32_Sword;  /* alignment 4 */
typedef uint32_t    Elf32_Word;   /* alignment 4 */

/* unsigned char, size 1, alignment 1 */

/* Define the structure of the file header for 32 bits. */
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_shstrndx;
} Elf32_Ehdr;

/* Define the structure of a program header table for 32-bits. */
typedef struct {
  Elf32_Word    p_type;
  Elf32_Off     p_offset;
  Elf32_Addr    p_vaddr;
  Elf32_Addr    p_paddr;
  Elf32_Word    p_filesz;
  Elf32_Word    p_memsz;
  Elf32_Word    p_flags;
  Elf32_Word    p_align;
} Elf32_Phdr;

/*
 * Define 32-bit section headers.
 * ncfileutil wants section headers, even though service runtime does
 * not.
 */
typedef struct {
  Elf32_Word  sh_name;
  Elf32_Word  sh_type;
  Elf32_Word  sh_flags;
  Elf32_Addr  sh_addr;
  Elf32_Off   sh_offset;
  Elf32_Word  sh_size;
  Elf32_Word  sh_link;
  Elf32_Word  sh_info;
  Elf32_Word  sh_addralign;
  Elf32_Word  sh_entsize;
} Elf32_Shdr;

typedef struct {
  Elf32_Sword d_tag;
  union {
    Elf32_Word d_val;
    Elf32_Addr d_ptr;
  } d_un;
} Elf32_Dyn;

typedef struct {
  Elf32_Addr r_offset;
  Elf32_Word r_info;
} Elf32_Rel;

#define ELF32_R_TYPE(val) ((val) & 0xff)

typedef struct {
  Elf32_Word n_namesz;
  Elf32_Word n_descsz;
  Elf32_Word n_type;
} Elf32_Nhdr;

/*
 * The auxiliary vector is passed on the stack between ELF loaders,
 * dynamic linkers, and program startup code.  The gratuitous union
 * is the historical standard API, though it has no purpose today.
 */
typedef struct {
  Elf32_Word a_type;            /* Entry type */
  union {
      Elf32_Word a_val;         /* Integer value */
    } a_un;
} Elf32_auxv_t;

/*
 * Symbol table entries.
 */

typedef struct {
  Elf32_Word  st_name;  /* String table index of name. */
  Elf32_Addr  st_value; /* Symbol value. */
  Elf32_Word  st_size;  /* Size of associated object. */
  unsigned char st_info;  /* Type and binding information. */
  unsigned char st_other; /* Reserved (not used). */
  Elf32_Half  st_shndx; /* Section index of symbol. */
} Elf32_Sym;

/* Macros for accessing the fields of st_info. */
#define ELF32_ST_BIND(info)             ((info) >> 4)
#define ELF32_ST_TYPE(info)             ((info) & 0xf)
EXTERN_C_END

#endif  /* NATIVE_CLIENT_SRC_INCLUDE_ELF32_H_ */