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elf32.h

/*-
 * 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 1.8 2002/05/30 08:32:18 dfr Exp $
 */

#ifndef ___k_kLdrFmts_elf32_h___
#define ___k_kLdrFmts_elf32_h___

#include <k/kDefs.h>
#include <k/kTypes.h>
#include <k/kLdrFmts/elf_common.h>

/*
 * ELF definitions common to all 32-bit architectures.
 */

typedef KU32      Elf32_Addr;
typedef KU16      Elf32_Half;
typedef KU32      Elf32_Off;
typedef KI32            Elf32_Sword;
typedef KU32      Elf32_Word;
typedef KU32      Elf32_Size;
typedef Elf32_Off Elf32_Hashelt;

/*
 * ELF header.
 */

typedef struct Elf32_Ehdr {
      unsigned char     e_ident[EI_NIDENT];     /* File identification. */
      Elf32_Half  e_type;           /* File type. */
      Elf32_Half  e_machine;  /* Machine architecture. */
      Elf32_Word  e_version;  /* ELF format version. */
      Elf32_Addr  e_entry;    /* Entry point. */
      Elf32_Off   e_phoff;    /* Program header file offset. */
      Elf32_Off   e_shoff;    /* Section header file offset. */
      Elf32_Word  e_flags;    /* Architecture-specific flags. */
      Elf32_Half  e_ehsize;   /* Size of ELF header in bytes. */
      Elf32_Half  e_phentsize;      /* Size of program header entry. */
      Elf32_Half  e_phnum;    /* Number of program header entries. */
      Elf32_Half  e_shentsize;      /* Size of section header entry. */
      Elf32_Half  e_shnum;    /* Number of section header entries. */
      Elf32_Half  e_shstrndx; /* Section name strings section. */
} Elf32_Ehdr;

/*
 * Section header.
 */

typedef struct {
      Elf32_Word  sh_name;    /* Section name (index into the
                                 section header string table). */
      Elf32_Word  sh_type;    /* Section type. */
      Elf32_Word  sh_flags;   /* Section flags. */
      Elf32_Addr  sh_addr;    /* Address in memory image. */
      Elf32_Off   sh_offset;  /* Offset in file. */
      Elf32_Size  sh_size;    /* Size in bytes. */
      Elf32_Word  sh_link;    /* Index of a related section. */
      Elf32_Word  sh_info;    /* Depends on section type. */
      Elf32_Size  sh_addralign;     /* Alignment in bytes. */
      Elf32_Size  sh_entsize; /* Size of each entry in section. */
} Elf32_Shdr;

/*
 * Program header.
 */

typedef struct {
      Elf32_Word  p_type;           /* Entry type. */
      Elf32_Off   p_offset;   /* File offset of contents. */
      Elf32_Addr  p_vaddr;    /* Virtual address in memory image. */
      Elf32_Addr  p_paddr;    /* Physical address (not used). */
      Elf32_Size  p_filesz;   /* Size of contents in file. */
      Elf32_Size  p_memsz;    /* Size of contents in memory. */
      Elf32_Word  p_flags;    /* Access permission flags. */
      Elf32_Size  p_align;    /* Alignment in memory and file. */
} Elf32_Phdr;

/*
 * Dynamic structure.  The ".dynamic" section contains an array of them.
 */

typedef struct {
      Elf32_Sword d_tag;            /* Entry type. */
      union {
            Elf32_Size  d_val;      /* Integer value. */
            Elf32_Addr  d_ptr;      /* Address value. */
      } d_un;
} Elf32_Dyn;

/*
 * Relocation entries.
 */

/* Relocations that don't need an addend field. */
typedef struct {
      Elf32_Addr  r_offset;   /* Location to be relocated. */
      Elf32_Word  r_info;           /* Relocation type and symbol index. */
} Elf32_Rel;

/* Relocations that need an addend field. */
typedef struct {
      Elf32_Addr  r_offset;   /* Location to be relocated. */
      Elf32_Word  r_info;           /* Relocation type and symbol index. */
      Elf32_Sword r_addend;   /* Addend. */
} Elf32_Rela;

/* Macros for accessing the fields of r_info. */
#define ELF32_R_SYM(info)     ((info) >> 8)
#define ELF32_R_TYPE(info)    ((unsigned char)(info))

/* Macro for constructing r_info from field values. */
#define ELF32_R_INFO(sym, type)     (((sym) << 8) + (unsigned char)(type))

/*
 * Symbol table entries.
 */

typedef struct {
      Elf32_Word  st_name;    /* String table index of name. */
      Elf32_Addr  st_value;   /* Symbol value. */
      Elf32_Size  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)

/* Macro for constructing st_info from field values. */
#define ELF32_ST_INFO(bind, type)   (((bind) << 4) + ((type) & 0xf))

#endif


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