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  * $FreeBSD$
   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 uint32_t        Elf32_Addr;
   39 typedef uint16_t        Elf32_Half;
   40 typedef uint32_t        Elf32_Off;
   41 typedef int32_t         Elf32_Sword;
   42 typedef uint32_t        Elf32_Word;
   43 typedef uint64_t        Elf32_Lword;
   44 
   45 typedef Elf32_Word      Elf32_Hashelt;
   46 
   47 /* Non-standard class-dependent datatype used for abstraction. */
   48 typedef Elf32_Word      Elf32_Size;
   49 typedef Elf32_Sword     Elf32_Ssize;
   50 
   51 /*
   52  * ELF header.
   53  */
   54 
   55 typedef struct {
   56         unsigned char   e_ident[EI_NIDENT];     /* File identification. */
   57         Elf32_Half      e_type;         /* File type. */
   58         Elf32_Half      e_machine;      /* Machine architecture. */
   59         Elf32_Word      e_version;      /* ELF format version. */
   60         Elf32_Addr      e_entry;        /* Entry point. */
   61         Elf32_Off       e_phoff;        /* Program header file offset. */
   62         Elf32_Off       e_shoff;        /* Section header file offset. */
   63         Elf32_Word      e_flags;        /* Architecture-specific flags. */
   64         Elf32_Half      e_ehsize;       /* Size of ELF header in bytes. */
   65         Elf32_Half      e_phentsize;    /* Size of program header entry. */
   66         Elf32_Half      e_phnum;        /* Number of program header entries. */
   67         Elf32_Half      e_shentsize;    /* Size of section header entry. */
   68         Elf32_Half      e_shnum;        /* Number of section header entries. */
   69         Elf32_Half      e_shstrndx;     /* Section name strings section. */
   70 } Elf32_Ehdr;
   71 
   72 /*
   73  * Section header.
   74  */
   75 
   76 typedef struct {
   77         Elf32_Word      sh_name;        /* Section name (index into the
   78                                            section header string table). */
   79         Elf32_Word      sh_type;        /* Section type. */
   80         Elf32_Word      sh_flags;       /* Section flags. */
   81         Elf32_Addr      sh_addr;        /* Address in memory image. */
   82         Elf32_Off       sh_offset;      /* Offset in file. */
   83         Elf32_Word      sh_size;        /* Size in bytes. */
   84         Elf32_Word      sh_link;        /* Index of a related section. */
   85         Elf32_Word      sh_info;        /* Depends on section type. */
   86         Elf32_Word      sh_addralign;   /* Alignment in bytes. */
   87         Elf32_Word      sh_entsize;     /* Size of each entry in section. */
   88 } Elf32_Shdr;
   89 
   90 /*
   91  * Program header.
   92  */
   93 
   94 typedef struct {
   95         Elf32_Word      p_type;         /* Entry type. */
   96         Elf32_Off       p_offset;       /* File offset of contents. */
   97         Elf32_Addr      p_vaddr;        /* Virtual address in memory image. */
   98         Elf32_Addr      p_paddr;        /* Physical address (not used). */
   99         Elf32_Word      p_filesz;       /* Size of contents in file. */
  100         Elf32_Word      p_memsz;        /* Size of contents in memory. */
  101         Elf32_Word      p_flags;        /* Access permission flags. */
  102         Elf32_Word      p_align;        /* Alignment in memory and file. */
  103 } Elf32_Phdr;
  104 
  105 /*
  106  * Dynamic structure.  The ".dynamic" section contains an array of them.
  107  */
  108 
  109 typedef struct {
  110         Elf32_Sword     d_tag;          /* Entry type. */
  111         union {
  112                 Elf32_Word      d_val;  /* Integer value. */
  113                 Elf32_Addr      d_ptr;  /* Address value. */
  114         } d_un;
  115 } Elf32_Dyn;
  116 
  117 /*
  118  * Relocation entries.
  119  */
  120 
  121 /* Relocations that don't need an addend field. */
  122 typedef struct {
  123         Elf32_Addr      r_offset;       /* Location to be relocated. */
  124         Elf32_Word      r_info;         /* Relocation type and symbol index. */
  125 } Elf32_Rel;
  126 
  127 /* Relocations that need an addend field. */
  128 typedef struct {
  129         Elf32_Addr      r_offset;       /* Location to be relocated. */
  130         Elf32_Word      r_info;         /* Relocation type and symbol index. */
  131         Elf32_Sword     r_addend;       /* Addend. */
  132 } Elf32_Rela;
  133 
  134 /* Macros for accessing the fields of r_info. */
  135 #define ELF32_R_SYM(info)       ((info) >> 8)
  136 #define ELF32_R_TYPE(info)      ((unsigned char)(info))
  137 
  138 /* Macro for constructing r_info from field values. */
  139 #define ELF32_R_INFO(sym, type) (((sym) << 8) + (unsigned char)(type))
  140 
  141 /*
  142  *      Note entry header
  143  */
  144 typedef Elf_Note Elf32_Nhdr;
  145 
  146 /*
  147  *      Move entry
  148  */
  149 typedef struct {
  150         Elf32_Lword     m_value;        /* symbol value */
  151         Elf32_Word      m_info;         /* size + index */
  152         Elf32_Word      m_poffset;      /* symbol offset */
  153         Elf32_Half      m_repeat;       /* repeat count */
  154         Elf32_Half      m_stride;       /* stride info */
  155 } Elf32_Move;
  156 
  157 /*
  158  *      The macros compose and decompose values for Move.r_info
  159  *
  160  *      sym = ELF32_M_SYM(M.m_info)
  161  *      size = ELF32_M_SIZE(M.m_info)
  162  *      M.m_info = ELF32_M_INFO(sym, size)
  163  */
  164 #define ELF32_M_SYM(info)       ((info)>>8)
  165 #define ELF32_M_SIZE(info)      ((unsigned char)(info))
  166 #define ELF32_M_INFO(sym, size) (((sym)<<8)+(unsigned char)(size))
  167 
  168 /*
  169  *      Hardware/Software capabilities entry
  170  */
  171 typedef struct {
  172         Elf32_Word      c_tag;          /* how to interpret value */
  173         union {
  174                 Elf32_Word      c_val;
  175                 Elf32_Addr      c_ptr;
  176         } c_un;
  177 } Elf32_Cap;
  178 
  179 /*
  180  * Symbol table entries.
  181  */
  182 
  183 typedef struct {
  184         Elf32_Word      st_name;        /* String table index of name. */
  185         Elf32_Addr      st_value;       /* Symbol value. */
  186         Elf32_Word      st_size;        /* Size of associated object. */
  187         unsigned char   st_info;        /* Type and binding information. */
  188         unsigned char   st_other;       /* Reserved (not used). */
  189         Elf32_Half      st_shndx;       /* Section index of symbol. */
  190 } Elf32_Sym;
  191 
  192 /* Macros for accessing the fields of st_info. */
  193 #define ELF32_ST_BIND(info)             ((info) >> 4)
  194 #define ELF32_ST_TYPE(info)             ((info) & 0xf)
  195 
  196 /* Macro for constructing st_info from field values. */
  197 #define ELF32_ST_INFO(bind, type)       (((bind) << 4) + ((type) & 0xf))
  198 
  199 /* Macro for accessing the fields of st_other. */
  200 #define ELF32_ST_VISIBILITY(oth)        ((oth) & 0x3)
  201 
  202 /* Structures used by Sun & GNU symbol versioning. */
  203 typedef struct
  204 {
  205         Elf32_Half      vd_version;
  206         Elf32_Half      vd_flags;
  207         Elf32_Half      vd_ndx;
  208         Elf32_Half      vd_cnt;
  209         Elf32_Word      vd_hash;
  210         Elf32_Word      vd_aux;
  211         Elf32_Word      vd_next;
  212 } Elf32_Verdef;
  213 
  214 typedef struct
  215 {
  216         Elf32_Word      vda_name;
  217         Elf32_Word      vda_next;
  218 } Elf32_Verdaux;
  219 
  220 typedef struct
  221 {
  222         Elf32_Half      vn_version;
  223         Elf32_Half      vn_cnt;
  224         Elf32_Word      vn_file;
  225         Elf32_Word      vn_aux;
  226         Elf32_Word      vn_next;
  227 } Elf32_Verneed;
  228 
  229 typedef struct
  230 {
  231         Elf32_Word      vna_hash;
  232         Elf32_Half      vna_flags;
  233         Elf32_Half      vna_other;
  234         Elf32_Word      vna_name;
  235         Elf32_Word      vna_next;
  236 } Elf32_Vernaux;
  237 
  238 typedef Elf32_Half Elf32_Versym;
  239 
  240 typedef struct {
  241         Elf32_Half      si_boundto;     /* direct bindings - symbol bound to */
  242         Elf32_Half      si_flags;       /* per symbol flags */
  243 } Elf32_Syminfo;
  244 
  245 #endif /* !_SYS_ELF32_H_ */

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