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: releng/10.0/sys/sys/elf64.h 186667 2009-01-01 02:08:56Z obrien $
   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 uint64_t        Elf64_Addr;
   39 typedef uint16_t        Elf64_Half;
   40 typedef uint64_t        Elf64_Off;
   41 typedef int32_t         Elf64_Sword;
   42 typedef int64_t         Elf64_Sxword;
   43 typedef uint32_t        Elf64_Word;
   44 typedef uint64_t        Elf64_Lword;
   45 typedef uint64_t        Elf64_Xword;
   46 
   47 /*
   48  * Types of dynamic symbol hash table bucket and chain elements.
   49  *
   50  * This is inconsistent among 64 bit architectures, so a machine dependent
   51  * typedef is required.
   52  */
   53 
   54 typedef Elf64_Word      Elf64_Hashelt;
   55 
   56 /* Non-standard class-dependent datatype used for abstraction. */
   57 typedef Elf64_Xword     Elf64_Size;
   58 typedef Elf64_Sxword    Elf64_Ssize;
   59 
   60 /*
   61  * ELF header.
   62  */
   63 
   64 typedef struct {
   65         unsigned char   e_ident[EI_NIDENT];     /* File identification. */
   66         Elf64_Half      e_type;         /* File type. */
   67         Elf64_Half      e_machine;      /* Machine architecture. */
   68         Elf64_Word      e_version;      /* ELF format version. */
   69         Elf64_Addr      e_entry;        /* Entry point. */
   70         Elf64_Off       e_phoff;        /* Program header file offset. */
   71         Elf64_Off       e_shoff;        /* Section header file offset. */
   72         Elf64_Word      e_flags;        /* Architecture-specific flags. */
   73         Elf64_Half      e_ehsize;       /* Size of ELF header in bytes. */
   74         Elf64_Half      e_phentsize;    /* Size of program header entry. */
   75         Elf64_Half      e_phnum;        /* Number of program header entries. */
   76         Elf64_Half      e_shentsize;    /* Size of section header entry. */
   77         Elf64_Half      e_shnum;        /* Number of section header entries. */
   78         Elf64_Half      e_shstrndx;     /* Section name strings section. */
   79 } Elf64_Ehdr;
   80 
   81 /*
   82  * Section header.
   83  */
   84 
   85 typedef struct {
   86         Elf64_Word      sh_name;        /* Section name (index into the
   87                                            section header string table). */
   88         Elf64_Word      sh_type;        /* Section type. */
   89         Elf64_Xword     sh_flags;       /* Section flags. */
   90         Elf64_Addr      sh_addr;        /* Address in memory image. */
   91         Elf64_Off       sh_offset;      /* Offset in file. */
   92         Elf64_Xword     sh_size;        /* Size in bytes. */
   93         Elf64_Word      sh_link;        /* Index of a related section. */
   94         Elf64_Word      sh_info;        /* Depends on section type. */
   95         Elf64_Xword     sh_addralign;   /* Alignment in bytes. */
   96         Elf64_Xword     sh_entsize;     /* Size of each entry in section. */
   97 } Elf64_Shdr;
   98 
   99 /*
  100  * Program header.
  101  */
  102 
  103 typedef struct {
  104         Elf64_Word      p_type;         /* Entry type. */
  105         Elf64_Word      p_flags;        /* Access permission flags. */
  106         Elf64_Off       p_offset;       /* File offset of contents. */
  107         Elf64_Addr      p_vaddr;        /* Virtual address in memory image. */
  108         Elf64_Addr      p_paddr;        /* Physical address (not used). */
  109         Elf64_Xword     p_filesz;       /* Size of contents in file. */
  110         Elf64_Xword     p_memsz;        /* Size of contents in memory. */
  111         Elf64_Xword     p_align;        /* Alignment in memory and file. */
  112 } Elf64_Phdr;
  113 
  114 /*
  115  * Dynamic structure.  The ".dynamic" section contains an array of them.
  116  */
  117 
  118 typedef struct {
  119         Elf64_Sxword    d_tag;          /* Entry type. */
  120         union {
  121                 Elf64_Xword     d_val;  /* Integer value. */
  122                 Elf64_Addr      d_ptr;  /* Address value. */
  123         } d_un;
  124 } Elf64_Dyn;
  125 
  126 /*
  127  * Relocation entries.
  128  */
  129 
  130 /* Relocations that don't need an addend field. */
  131 typedef struct {
  132         Elf64_Addr      r_offset;       /* Location to be relocated. */
  133         Elf64_Xword     r_info;         /* Relocation type and symbol index. */
  134 } Elf64_Rel;
  135 
  136 /* Relocations that need an addend field. */
  137 typedef struct {
  138         Elf64_Addr      r_offset;       /* Location to be relocated. */
  139         Elf64_Xword     r_info;         /* Relocation type and symbol index. */
  140         Elf64_Sxword    r_addend;       /* Addend. */
  141 } Elf64_Rela;
  142 
  143 /* Macros for accessing the fields of r_info. */
  144 #define ELF64_R_SYM(info)       ((info) >> 32)
  145 #define ELF64_R_TYPE(info)      ((info) & 0xffffffffL)
  146 
  147 /* Macro for constructing r_info from field values. */
  148 #define ELF64_R_INFO(sym, type) (((sym) << 32) + ((type) & 0xffffffffL))
  149 
  150 #define ELF64_R_TYPE_DATA(info) (((Elf64_Xword)(info)<<32)>>40)
  151 #define ELF64_R_TYPE_ID(info)   (((Elf64_Xword)(info)<<56)>>56)
  152 #define ELF64_R_TYPE_INFO(data, type)   \
  153                                 (((Elf64_Xword)(data)<<8)+(Elf64_Xword)(type))
  154 
  155 /*
  156  *      Note entry header
  157  */
  158 typedef Elf_Note Elf64_Nhdr;
  159 
  160 /*
  161  *      Move entry
  162  */
  163 typedef struct {
  164         Elf64_Lword     m_value;        /* symbol value */
  165         Elf64_Xword     m_info;         /* size + index */
  166         Elf64_Xword     m_poffset;      /* symbol offset */
  167         Elf64_Half      m_repeat;       /* repeat count */
  168         Elf64_Half      m_stride;       /* stride info */
  169 } Elf64_Move;
  170 
  171 #define ELF64_M_SYM(info)       ((info)>>8)
  172 #define ELF64_M_SIZE(info)      ((unsigned char)(info))
  173 #define ELF64_M_INFO(sym, size) (((sym)<<8)+(unsigned char)(size))
  174 
  175 /*
  176  *      Hardware/Software capabilities entry
  177  */
  178 typedef struct {
  179         Elf64_Xword     c_tag;          /* how to interpret value */
  180         union {
  181                 Elf64_Xword     c_val;
  182                 Elf64_Addr      c_ptr;
  183         } c_un;
  184 } Elf64_Cap;
  185 
  186 /*
  187  * Symbol table entries.
  188  */
  189 
  190 typedef struct {
  191         Elf64_Word      st_name;        /* String table index of name. */
  192         unsigned char   st_info;        /* Type and binding information. */
  193         unsigned char   st_other;       /* Reserved (not used). */
  194         Elf64_Half      st_shndx;       /* Section index of symbol. */
  195         Elf64_Addr      st_value;       /* Symbol value. */
  196         Elf64_Xword     st_size;        /* Size of associated object. */
  197 } Elf64_Sym;
  198 
  199 /* Macros for accessing the fields of st_info. */
  200 #define ELF64_ST_BIND(info)             ((info) >> 4)
  201 #define ELF64_ST_TYPE(info)             ((info) & 0xf)
  202 
  203 /* Macro for constructing st_info from field values. */
  204 #define ELF64_ST_INFO(bind, type)       (((bind) << 4) + ((type) & 0xf))
  205 
  206 /* Macro for accessing the fields of st_other. */
  207 #define ELF64_ST_VISIBILITY(oth)        ((oth) & 0x3)
  208 
  209 /* Structures used by Sun & GNU-style symbol versioning. */
  210 typedef struct {
  211         Elf64_Half      vd_version;
  212         Elf64_Half      vd_flags;
  213         Elf64_Half      vd_ndx;
  214         Elf64_Half      vd_cnt;
  215         Elf64_Word      vd_hash;
  216         Elf64_Word      vd_aux;
  217         Elf64_Word      vd_next;
  218 } Elf64_Verdef;
  219 
  220 typedef struct {
  221         Elf64_Word      vda_name;
  222         Elf64_Word      vda_next;
  223 } Elf64_Verdaux;
  224 
  225 typedef struct {
  226         Elf64_Half      vn_version;
  227         Elf64_Half      vn_cnt;
  228         Elf64_Word      vn_file;
  229         Elf64_Word      vn_aux;
  230         Elf64_Word      vn_next;
  231 } Elf64_Verneed;
  232 
  233 typedef struct {
  234         Elf64_Word      vna_hash;
  235         Elf64_Half      vna_flags;
  236         Elf64_Half      vna_other;
  237         Elf64_Word      vna_name;
  238         Elf64_Word      vna_next;
  239 } Elf64_Vernaux;
  240 
  241 typedef Elf64_Half Elf64_Versym;
  242 
  243 typedef struct {
  244         Elf64_Half      si_boundto;     /* direct bindings - symbol bound to */
  245         Elf64_Half      si_flags;       /* per symbol flags */
  246 } Elf64_Syminfo;
  247 
  248 #endif /* !_SYS_ELF64_H_ */

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