The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/elf32.h

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    1 /*-
    2  * Copyright (c) 1996-1998 John D. Polstra.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/5.0/sys/sys/elf32.h 97564 2002-05-30 08:32:18Z dfr $
   27  */
   28 
   29 #ifndef _SYS_ELF32_H_
   30 #define _SYS_ELF32_H_ 1
   31 
   32 #include <sys/elf_common.h>
   33 
   34 /*
   35  * ELF definitions common to all 32-bit architectures.
   36  */
   37 
   38 typedef u_int32_t       Elf32_Addr;
   39 typedef u_int16_t       Elf32_Half;
   40 typedef u_int32_t       Elf32_Off;
   41 typedef int32_t         Elf32_Sword;
   42 typedef u_int32_t       Elf32_Word;
   43 typedef u_int32_t       Elf32_Size;
   44 typedef Elf32_Off       Elf32_Hashelt;
   45 
   46 /*
   47  * ELF header.
   48  */
   49 
   50 typedef struct {
   51         unsigned char   e_ident[EI_NIDENT];     /* File identification. */
   52         Elf32_Half      e_type;         /* File type. */
   53         Elf32_Half      e_machine;      /* Machine architecture. */
   54         Elf32_Word      e_version;      /* ELF format version. */
   55         Elf32_Addr      e_entry;        /* Entry point. */
   56         Elf32_Off       e_phoff;        /* Program header file offset. */
   57         Elf32_Off       e_shoff;        /* Section header file offset. */
   58         Elf32_Word      e_flags;        /* Architecture-specific flags. */
   59         Elf32_Half      e_ehsize;       /* Size of ELF header in bytes. */
   60         Elf32_Half      e_phentsize;    /* Size of program header entry. */
   61         Elf32_Half      e_phnum;        /* Number of program header entries. */
   62         Elf32_Half      e_shentsize;    /* Size of section header entry. */
   63         Elf32_Half      e_shnum;        /* Number of section header entries. */
   64         Elf32_Half      e_shstrndx;     /* Section name strings section. */
   65 } Elf32_Ehdr;
   66 
   67 /*
   68  * Section header.
   69  */
   70 
   71 typedef struct {
   72         Elf32_Word      sh_name;        /* Section name (index into the
   73                                            section header string table). */
   74         Elf32_Word      sh_type;        /* Section type. */
   75         Elf32_Word      sh_flags;       /* Section flags. */
   76         Elf32_Addr      sh_addr;        /* Address in memory image. */
   77         Elf32_Off       sh_offset;      /* Offset in file. */
   78         Elf32_Size      sh_size;        /* Size in bytes. */
   79         Elf32_Word      sh_link;        /* Index of a related section. */
   80         Elf32_Word      sh_info;        /* Depends on section type. */
   81         Elf32_Size      sh_addralign;   /* Alignment in bytes. */
   82         Elf32_Size      sh_entsize;     /* Size of each entry in section. */
   83 } Elf32_Shdr;
   84 
   85 /*
   86  * Program header.
   87  */
   88 
   89 typedef struct {
   90         Elf32_Word      p_type;         /* Entry type. */
   91         Elf32_Off       p_offset;       /* File offset of contents. */
   92         Elf32_Addr      p_vaddr;        /* Virtual address in memory image. */
   93         Elf32_Addr      p_paddr;        /* Physical address (not used). */
   94         Elf32_Size      p_filesz;       /* Size of contents in file. */
   95         Elf32_Size      p_memsz;        /* Size of contents in memory. */
   96         Elf32_Word      p_flags;        /* Access permission flags. */
   97         Elf32_Size      p_align;        /* Alignment in memory and file. */
   98 } Elf32_Phdr;
   99 
  100 /*
  101  * Dynamic structure.  The ".dynamic" section contains an array of them.
  102  */
  103 
  104 typedef struct {
  105         Elf32_Sword     d_tag;          /* Entry type. */
  106         union {
  107                 Elf32_Size      d_val;  /* Integer value. */
  108                 Elf32_Addr      d_ptr;  /* Address value. */
  109         } d_un;
  110 } Elf32_Dyn;
  111 
  112 /*
  113  * Relocation entries.
  114  */
  115 
  116 /* Relocations that don't need an addend field. */
  117 typedef struct {
  118         Elf32_Addr      r_offset;       /* Location to be relocated. */
  119         Elf32_Word      r_info;         /* Relocation type and symbol index. */
  120 } Elf32_Rel;
  121 
  122 /* Relocations that need an addend field. */
  123 typedef struct {
  124         Elf32_Addr      r_offset;       /* Location to be relocated. */
  125         Elf32_Word      r_info;         /* Relocation type and symbol index. */
  126         Elf32_Sword     r_addend;       /* Addend. */
  127 } Elf32_Rela;
  128 
  129 /* Macros for accessing the fields of r_info. */
  130 #define ELF32_R_SYM(info)       ((info) >> 8)
  131 #define ELF32_R_TYPE(info)      ((unsigned char)(info))
  132 
  133 /* Macro for constructing r_info from field values. */
  134 #define ELF32_R_INFO(sym, type) (((sym) << 8) + (unsigned char)(type))
  135 
  136 /*
  137  * Symbol table entries.
  138  */
  139 
  140 typedef struct {
  141         Elf32_Word      st_name;        /* String table index of name. */
  142         Elf32_Addr      st_value;       /* Symbol value. */
  143         Elf32_Size      st_size;        /* Size of associated object. */
  144         unsigned char   st_info;        /* Type and binding information. */
  145         unsigned char   st_other;       /* Reserved (not used). */
  146         Elf32_Half      st_shndx;       /* Section index of symbol. */
  147 } Elf32_Sym;
  148 
  149 /* Macros for accessing the fields of st_info. */
  150 #define ELF32_ST_BIND(info)             ((info) >> 4)
  151 #define ELF32_ST_TYPE(info)             ((info) & 0xf)
  152 
  153 /* Macro for constructing st_info from field values. */
  154 #define ELF32_ST_INFO(bind, type)       (((bind) << 4) + ((type) & 0xf))
  155 
  156 #endif /* !_SYS_ELF32_H_ */

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