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/elf64.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  * $FreeBSD$
   27  */
   28 
   29 #ifndef _SYS_ELF64_H_
   30 #define _SYS_ELF64_H_ 1
   31 
   32 #include <sys/elf_common.h>
   33 
   34 /*
   35  * ELF definitions common to all 64-bit architectures.
   36  */
   37 
   38 typedef u_int64_t       Elf64_Addr;
   39 typedef u_int32_t       Elf64_Half;
   40 typedef u_int64_t       Elf64_Off;
   41 typedef int64_t         Elf64_Sword;
   42 typedef u_int64_t       Elf64_Word;
   43 typedef u_int64_t       Elf64_Size;
   44 typedef u_int16_t       Elf64_Quarter;
   45 
   46 /*
   47  * Types of dynamic symbol hash table bucket and chain elements.
   48  *
   49  * This is inconsistent among 64 bit architectures, so a machine dependent
   50  * typedef is required.
   51  */
   52 
   53 #ifdef __alpha__
   54 typedef Elf64_Off       Elf64_Hashelt;
   55 #else
   56 typedef Elf64_Half      Elf64_Hashelt;
   57 #endif
   58 
   59 /*
   60  * ELF header.
   61  */
   62 
   63 typedef struct {
   64         unsigned char   e_ident[EI_NIDENT];     /* File identification. */
   65         Elf64_Quarter   e_type;         /* File type. */
   66         Elf64_Quarter   e_machine;      /* Machine architecture. */
   67         Elf64_Half      e_version;      /* ELF format version. */
   68         Elf64_Addr      e_entry;        /* Entry point. */
   69         Elf64_Off       e_phoff;        /* Program header file offset. */
   70         Elf64_Off       e_shoff;        /* Section header file offset. */
   71         Elf64_Half      e_flags;        /* Architecture-specific flags. */
   72         Elf64_Quarter   e_ehsize;       /* Size of ELF header in bytes. */
   73         Elf64_Quarter   e_phentsize;    /* Size of program header entry. */
   74         Elf64_Quarter   e_phnum;        /* Number of program header entries. */
   75         Elf64_Quarter   e_shentsize;    /* Size of section header entry. */
   76         Elf64_Quarter   e_shnum;        /* Number of section header entries. */
   77         Elf64_Quarter   e_shstrndx;     /* Section name strings section. */
   78 } Elf64_Ehdr;
   79 
   80 /*
   81  * Section header.
   82  */
   83 
   84 typedef struct {
   85         Elf64_Half      sh_name;        /* Section name (index into the
   86                                            section header string table). */
   87         Elf64_Half      sh_type;        /* Section type. */
   88         Elf64_Size      sh_flags;       /* Section flags. */
   89         Elf64_Addr      sh_addr;        /* Address in memory image. */
   90         Elf64_Off       sh_offset;      /* Offset in file. */
   91         Elf64_Size      sh_size;        /* Size in bytes. */
   92         Elf64_Half      sh_link;        /* Index of a related section. */
   93         Elf64_Half      sh_info;        /* Depends on section type. */
   94         Elf64_Size      sh_addralign;   /* Alignment in bytes. */
   95         Elf64_Size      sh_entsize;     /* Size of each entry in section. */
   96 } Elf64_Shdr;
   97 
   98 /*
   99  * Program header.
  100  */
  101 
  102 typedef struct {
  103         Elf64_Half      p_type;         /* Entry type. */
  104         Elf64_Half      p_flags;        /* Access permission flags. */
  105         Elf64_Off       p_offset;       /* File offset of contents. */
  106         Elf64_Addr      p_vaddr;        /* Virtual address in memory image. */
  107         Elf64_Addr      p_paddr;        /* Physical address (not used). */
  108         Elf64_Size      p_filesz;       /* Size of contents in file. */
  109         Elf64_Size      p_memsz;        /* Size of contents in memory. */
  110         Elf64_Size      p_align;        /* Alignment in memory and file. */
  111 } Elf64_Phdr;
  112 
  113 /*
  114  * Dynamic structure.  The ".dynamic" section contains an array of them.
  115  */
  116 
  117 typedef struct {
  118         Elf64_Size      d_tag;          /* Entry type. */
  119         union {
  120                 Elf64_Size      d_val;  /* Integer value. */
  121                 Elf64_Addr      d_ptr;  /* Address value. */
  122         } d_un;
  123 } Elf64_Dyn;
  124 
  125 /*
  126  * Relocation entries.
  127  */
  128 
  129 /* Relocations that don't need an addend field. */
  130 typedef struct {
  131         Elf64_Addr      r_offset;       /* Location to be relocated. */
  132         Elf64_Size      r_info;         /* Relocation type and symbol index. */
  133 } Elf64_Rel;
  134 
  135 /* Relocations that need an addend field. */
  136 typedef struct {
  137         Elf64_Addr      r_offset;       /* Location to be relocated. */
  138         Elf64_Size      r_info;         /* Relocation type and symbol index. */
  139         Elf64_Off       r_addend;       /* Addend. */
  140 } Elf64_Rela;
  141 
  142 /* Macros for accessing the fields of r_info. */
  143 #define ELF64_R_SYM(info)       ((info) >> 32)
  144 #define ELF64_R_TYPE(info)      ((unsigned char)(info))
  145 
  146 /* Macro for constructing r_info from field values. */
  147 #define ELF64_R_INFO(sym, type) (((sym) << 32) + (unsigned char)(type))
  148 
  149 /*
  150  * Symbol table entries.
  151  */
  152 
  153 typedef struct {
  154         Elf64_Half      st_name;        /* String table index of name. */
  155         unsigned char   st_info;        /* Type and binding information. */
  156         unsigned char   st_other;       /* Reserved (not used). */
  157         Elf64_Quarter   st_shndx;       /* Section index of symbol. */
  158         Elf64_Addr      st_value;       /* Symbol value. */
  159         Elf64_Size      st_size;        /* Size of associated object. */
  160 } Elf64_Sym;
  161 
  162 /* Macros for accessing the fields of st_info. */
  163 #define ELF64_ST_BIND(info)             ((info) >> 4)
  164 #define ELF64_ST_TYPE(info)             ((info) & 0xf)
  165 
  166 /* Macro for constructing st_info from field values. */
  167 #define ELF64_ST_INFO(bind, type)       (((bind) << 4) + ((type) & 0xf))
  168 
  169 #endif /* !_SYS_ELF64_H_ */

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