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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 1996-1998 John D. Polstra.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: stable/12/sys/sys/elf32.h 326256 2017-11-27 15:01:59Z pfg $
   29  */
   30 
   31 #ifndef _SYS_ELF32_H_
   32 #define _SYS_ELF32_H_ 1
   33 
   34 #include <sys/elf_common.h>
   35 
   36 /*
   37  * ELF definitions common to all 32-bit architectures.
   38  */
   39 
   40 typedef uint32_t        Elf32_Addr;
   41 typedef uint16_t        Elf32_Half;
   42 typedef uint32_t        Elf32_Off;
   43 typedef int32_t         Elf32_Sword;
   44 typedef uint32_t        Elf32_Word;
   45 typedef uint64_t        Elf32_Lword;
   46 
   47 typedef Elf32_Word      Elf32_Hashelt;
   48 
   49 /* Non-standard class-dependent datatype used for abstraction. */
   50 typedef Elf32_Word      Elf32_Size;
   51 typedef Elf32_Sword     Elf32_Ssize;
   52 
   53 /*
   54  * ELF header.
   55  */
   56 
   57 typedef struct {
   58         unsigned char   e_ident[EI_NIDENT];     /* File identification. */
   59         Elf32_Half      e_type;         /* File type. */
   60         Elf32_Half      e_machine;      /* Machine architecture. */
   61         Elf32_Word      e_version;      /* ELF format version. */
   62         Elf32_Addr      e_entry;        /* Entry point. */
   63         Elf32_Off       e_phoff;        /* Program header file offset. */
   64         Elf32_Off       e_shoff;        /* Section header file offset. */
   65         Elf32_Word      e_flags;        /* Architecture-specific flags. */
   66         Elf32_Half      e_ehsize;       /* Size of ELF header in bytes. */
   67         Elf32_Half      e_phentsize;    /* Size of program header entry. */
   68         Elf32_Half      e_phnum;        /* Number of program header entries. */
   69         Elf32_Half      e_shentsize;    /* Size of section header entry. */
   70         Elf32_Half      e_shnum;        /* Number of section header entries. */
   71         Elf32_Half      e_shstrndx;     /* Section name strings section. */
   72 } Elf32_Ehdr;
   73 
   74 /*
   75  * Shared object information, found in SHT_MIPS_LIBLIST.
   76  */
   77 
   78 typedef struct {
   79         Elf32_Word l_name;              /* The name of a shared object. */
   80         Elf32_Word l_time_stamp;        /* 32-bit timestamp. */
   81         Elf32_Word l_checksum;          /* Checksum of visible symbols, sizes. */
   82         Elf32_Word l_version;           /* Interface version string index. */
   83         Elf32_Word l_flags;             /* Flags (LL_*). */
   84 } Elf32_Lib;
   85 
   86 /*
   87  * Section header.
   88  */
   89 
   90 typedef struct {
   91         Elf32_Word      sh_name;        /* Section name (index into the
   92                                            section header string table). */
   93         Elf32_Word      sh_type;        /* Section type. */
   94         Elf32_Word      sh_flags;       /* Section flags. */
   95         Elf32_Addr      sh_addr;        /* Address in memory image. */
   96         Elf32_Off       sh_offset;      /* Offset in file. */
   97         Elf32_Word      sh_size;        /* Size in bytes. */
   98         Elf32_Word      sh_link;        /* Index of a related section. */
   99         Elf32_Word      sh_info;        /* Depends on section type. */
  100         Elf32_Word      sh_addralign;   /* Alignment in bytes. */
  101         Elf32_Word      sh_entsize;     /* Size of each entry in section. */
  102 } Elf32_Shdr;
  103 
  104 /*
  105  * Program header.
  106  */
  107 
  108 typedef struct {
  109         Elf32_Word      p_type;         /* Entry type. */
  110         Elf32_Off       p_offset;       /* File offset of contents. */
  111         Elf32_Addr      p_vaddr;        /* Virtual address in memory image. */
  112         Elf32_Addr      p_paddr;        /* Physical address (not used). */
  113         Elf32_Word      p_filesz;       /* Size of contents in file. */
  114         Elf32_Word      p_memsz;        /* Size of contents in memory. */
  115         Elf32_Word      p_flags;        /* Access permission flags. */
  116         Elf32_Word      p_align;        /* Alignment in memory and file. */
  117 } Elf32_Phdr;
  118 
  119 /*
  120  * Dynamic structure.  The ".dynamic" section contains an array of them.
  121  */
  122 
  123 typedef struct {
  124         Elf32_Sword     d_tag;          /* Entry type. */
  125         union {
  126                 Elf32_Word      d_val;  /* Integer value. */
  127                 Elf32_Addr      d_ptr;  /* Address value. */
  128         } d_un;
  129 } Elf32_Dyn;
  130 
  131 /*
  132  * Relocation entries.
  133  */
  134 
  135 /* Relocations that don't need an addend field. */
  136 typedef struct {
  137         Elf32_Addr      r_offset;       /* Location to be relocated. */
  138         Elf32_Word      r_info;         /* Relocation type and symbol index. */
  139 } Elf32_Rel;
  140 
  141 /* Relocations that need an addend field. */
  142 typedef struct {
  143         Elf32_Addr      r_offset;       /* Location to be relocated. */
  144         Elf32_Word      r_info;         /* Relocation type and symbol index. */
  145         Elf32_Sword     r_addend;       /* Addend. */
  146 } Elf32_Rela;
  147 
  148 /* Macros for accessing the fields of r_info. */
  149 #define ELF32_R_SYM(info)       ((info) >> 8)
  150 #define ELF32_R_TYPE(info)      ((unsigned char)(info))
  151 
  152 /* Macro for constructing r_info from field values. */
  153 #define ELF32_R_INFO(sym, type) (((sym) << 8) + (unsigned char)(type))
  154 
  155 /*
  156  *      Note entry header
  157  */
  158 typedef Elf_Note Elf32_Nhdr;
  159 
  160 /*
  161  *      Move entry
  162  */
  163 typedef struct {
  164         Elf32_Lword     m_value;        /* symbol value */
  165         Elf32_Word      m_info;         /* size + index */
  166         Elf32_Word      m_poffset;      /* symbol offset */
  167         Elf32_Half      m_repeat;       /* repeat count */
  168         Elf32_Half      m_stride;       /* stride info */
  169 } Elf32_Move;
  170 
  171 /*
  172  *      The macros compose and decompose values for Move.r_info
  173  *
  174  *      sym = ELF32_M_SYM(M.m_info)
  175  *      size = ELF32_M_SIZE(M.m_info)
  176  *      M.m_info = ELF32_M_INFO(sym, size)
  177  */
  178 #define ELF32_M_SYM(info)       ((info)>>8)
  179 #define ELF32_M_SIZE(info)      ((unsigned char)(info))
  180 #define ELF32_M_INFO(sym, size) (((sym)<<8)+(unsigned char)(size))
  181 
  182 /*
  183  *      Hardware/Software capabilities entry
  184  */
  185 typedef struct {
  186         Elf32_Word      c_tag;          /* how to interpret value */
  187         union {
  188                 Elf32_Word      c_val;
  189                 Elf32_Addr      c_ptr;
  190         } c_un;
  191 } Elf32_Cap;
  192 
  193 /*
  194  * Symbol table entries.
  195  */
  196 
  197 typedef struct {
  198         Elf32_Word      st_name;        /* String table index of name. */
  199         Elf32_Addr      st_value;       /* Symbol value. */
  200         Elf32_Word      st_size;        /* Size of associated object. */
  201         unsigned char   st_info;        /* Type and binding information. */
  202         unsigned char   st_other;       /* Reserved (not used). */
  203         Elf32_Half      st_shndx;       /* Section index of symbol. */
  204 } Elf32_Sym;
  205 
  206 /* Macros for accessing the fields of st_info. */
  207 #define ELF32_ST_BIND(info)             ((info) >> 4)
  208 #define ELF32_ST_TYPE(info)             ((info) & 0xf)
  209 
  210 /* Macro for constructing st_info from field values. */
  211 #define ELF32_ST_INFO(bind, type)       (((bind) << 4) + ((type) & 0xf))
  212 
  213 /* Macro for accessing the fields of st_other. */
  214 #define ELF32_ST_VISIBILITY(oth)        ((oth) & 0x3)
  215 
  216 /* Structures used by Sun & GNU symbol versioning. */
  217 typedef struct
  218 {
  219         Elf32_Half      vd_version;
  220         Elf32_Half      vd_flags;
  221         Elf32_Half      vd_ndx;
  222         Elf32_Half      vd_cnt;
  223         Elf32_Word      vd_hash;
  224         Elf32_Word      vd_aux;
  225         Elf32_Word      vd_next;
  226 } Elf32_Verdef;
  227 
  228 typedef struct
  229 {
  230         Elf32_Word      vda_name;
  231         Elf32_Word      vda_next;
  232 } Elf32_Verdaux;
  233 
  234 typedef struct
  235 {
  236         Elf32_Half      vn_version;
  237         Elf32_Half      vn_cnt;
  238         Elf32_Word      vn_file;
  239         Elf32_Word      vn_aux;
  240         Elf32_Word      vn_next;
  241 } Elf32_Verneed;
  242 
  243 typedef struct
  244 {
  245         Elf32_Word      vna_hash;
  246         Elf32_Half      vna_flags;
  247         Elf32_Half      vna_other;
  248         Elf32_Word      vna_name;
  249         Elf32_Word      vna_next;
  250 } Elf32_Vernaux;
  251 
  252 typedef Elf32_Half Elf32_Versym;
  253 
  254 typedef struct {
  255         Elf32_Half      si_boundto;     /* direct bindings - symbol bound to */
  256         Elf32_Half      si_flags;       /* per symbol flags */
  257 } Elf32_Syminfo;
  258 
  259 typedef struct {
  260         Elf32_Word      ch_type;
  261         Elf32_Word      ch_size;
  262         Elf32_Word      ch_addralign;
  263 } Elf32_Chdr;
  264 
  265 #endif /* !_SYS_ELF32_H_ */

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