sys/sys/elf32.h

   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: src/sys/sys/elf32.h,v 1.7 1999/08/28 00:51:41 peter Exp $
  27  * $DragonFly: src/sys/sys/elf32.h,v 1.5 2006/10/23 21:50:33 dillon Exp $
  28  */
  29
  30 #ifndef _SYS_ELF32_H_
  31 #define _SYS_ELF32_H_
  32
  33 #ifndef _SYS_TYPES_H_
  34 #include <sys/types.h>
  35 #endif
  36 #ifndef _SYS_ELF_COMMON_H_
  37 #include <sys/elf_common.h>
  38 #endif
  39
  40 /*
  41  * ELF definitions common to all 32-bit architectures.
  42  */
  43
  44 typedef u_int32_t       Elf32_Addr;
  45 typedef u_int16_t       Elf32_Half;
  46 typedef u_int32_t       Elf32_Off;
  47 typedef int32_t         Elf32_Sword;
  48 typedef u_int32_t       Elf32_Word;
  49 typedef u_int32_t       Elf32_Size;
  50 typedef Elf32_Off       Elf32_Hashelt;
  51
  52 /*
  53  * ELF header.
  54  */
  55
  56 typedef struct {
  57         unsigned char   e_ident[EI_NIDENT];     /* File identification. */
  58         Elf32_Half      e_type;         /* File type. */
  59         Elf32_Half      e_machine;      /* Machine architecture. */
  60         Elf32_Word      e_version;      /* ELF format version. */
  61         Elf32_Addr      e_entry;        /* Entry point. */
  62         Elf32_Off       e_phoff;        /* Program header file offset. */
  63         Elf32_Off       e_shoff;        /* Section header file offset. */
  64         Elf32_Word      e_flags;        /* Architecture-specific flags. */
  65         Elf32_Half      e_ehsize;       /* Size of ELF header in bytes. */
  66         Elf32_Half      e_phentsize;    /* Size of program header entry. */
  67         Elf32_Half      e_phnum;        /* Number of program header entries. */
  68         Elf32_Half      e_shentsize;    /* Size of section header entry. */
  69         Elf32_Half      e_shnum;        /* Number of section header entries. */
  70         Elf32_Half      e_shstrndx;     /* Section name strings section. */
  71 } Elf32_Ehdr;
  72
  73 /*
  74  * Section header.
  75  */
  76
  77 typedef struct {
  78         Elf32_Word      sh_name;        /* Section name (index into the
  79                                            section header string table). */
  80         Elf32_Word      sh_type;        /* Section type. */
  81         Elf32_Word      sh_flags;       /* Section flags. */
  82         Elf32_Addr      sh_addr;        /* Address in memory image. */
  83         Elf32_Off       sh_offset;      /* Offset in file. */
  84         Elf32_Size      sh_size;        /* Size in bytes. */
  85         Elf32_Word      sh_link;        /* Index of a related section. */
  86         Elf32_Word      sh_info;        /* Depends on section type. */
  87         Elf32_Size      sh_addralign;   /* Alignment in bytes. */
  88         Elf32_Size      sh_entsize;     /* Size of each entry in section. */
  89 } Elf32_Shdr;
  90
  91 /*
  92  * Program header.
  93  */
  94
  95 typedef struct {
  96         Elf32_Word      p_type;         /* Entry type. */
  97         Elf32_Off       p_offset;       /* File offset of contents. */
  98         Elf32_Addr      p_vaddr;        /* Virtual address in memory image. */
  99         Elf32_Addr      p_paddr;        /* Physical address (not used). */
 100         Elf32_Size      p_filesz;       /* Size of contents in file. */
 101         Elf32_Size      p_memsz;        /* Size of contents in memory. */
 102         Elf32_Word      p_flags;        /* Access permission flags. */
 103         Elf32_Size      p_align;        /* Alignment in memory and file. */
 104 } Elf32_Phdr;
 105
 106 /*
 107  * Dynamic structure.  The ".dynamic" section contains an array of them.
 108  */
 109
 110 typedef struct {
 111         Elf32_Sword     d_tag;          /* Entry type. */
 112         union {
 113                 Elf32_Size      d_val;  /* Integer value. */
 114                 Elf32_Addr      d_ptr;  /* Address value. */
 115         } d_un;
 116 } Elf32_Dyn;
 117
 118 /*
 119  * Relocation entries.
 120  */
 121
 122 /* Relocations that don't 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_Rel;
 127
 128 /* Relocations that need an addend field. */
 129 typedef struct {
 130         Elf32_Addr      r_offset;       /* Location to be relocated. */
 131         Elf32_Word      r_info;         /* Relocation type and symbol index. */
 132         Elf32_Sword     r_addend;       /* Addend. */
 133 } Elf32_Rela;
 134
 135 /* Macros for accessing the fields of r_info. */
 136 #define ELF32_R_SYM(info)       ((info) >> 8)
 137 #define ELF32_R_TYPE(info)      ((unsigned char)(info))
 138
 139 /* Macro for constructing r_info from field values. */
 140 #define ELF32_R_INFO(sym, type) (((sym) << 8) + (unsigned char)(type))
 141
 142 /*
 143  * Symbol table entries.
 144  */
 145
 146 typedef struct {
 147         Elf32_Word      st_name;        /* String table index of name. */
 148         Elf32_Addr      st_value;       /* Symbol value. */
 149         Elf32_Size      st_size;        /* Size of associated object. */
 150         unsigned char   st_info;        /* Type and binding information. */
 151         unsigned char   st_other;       /* Reserved (not used). */
 152         Elf32_Half      st_shndx;       /* Section index of symbol. */
 153 } Elf32_Sym;
 154
 155 /* Macros for accessing the fields of st_info. */
 156 #define ELF32_ST_BIND(info)             ((info) >> 4)
 157 #define ELF32_ST_TYPE(info)             ((info) & 0xf)
 158
 159 /* Macro for constructing st_info from field values. */
 160 #define ELF32_ST_INFO(bind, type)       (((bind) << 4) + ((type) & 0xf))
 161
 162 #endif /* !_SYS_ELF32_H_ */