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 1.3 2003/11/10 06:12:17 dillon Exp $
  28  */
  29
  30 #ifndef _SYS_ELF32_H_
  31 #define _SYS_ELF32_H_ 1
  32
  33 #include <sys/elf_common.h>
  34
  35 /*
  36  * ELF definitions common to all 32-bit architectures.
  37  */
  38
  39 typedef u_int32_t       Elf32_Addr;
  40 typedef u_int16_t       Elf32_Half;
  41 typedef u_int32_t       Elf32_Off;
  42 typedef int32_t         Elf32_Sword;
  43 typedef u_int32_t       Elf32_Word;
  44 typedef u_int32_t       Elf32_Size;
  45 typedef Elf32_Off       Elf32_Hashelt;
  46
  47 /*
  48  * ELF header.
  49  */
  50
  51 typedef struct {
  52         unsigned char   e_ident[EI_NIDENT];     /* File identification. */
  53         Elf32_Half      e_type;         /* File type. */
  54         Elf32_Half      e_machine;      /* Machine architecture. */
  55         Elf32_Word      e_version;      /* ELF format version. */
  56         Elf32_Addr      e_entry;        /* Entry point. */
  57         Elf32_Off       e_phoff;        /* Program header file offset. */
  58         Elf32_Off       e_shoff;        /* Section header file offset. */
  59         Elf32_Word      e_flags;        /* Architecture-specific flags. */
  60         Elf32_Half      e_ehsize;       /* Size of ELF header in bytes. */
  61         Elf32_Half      e_phentsize;    /* Size of program header entry. */
  62         Elf32_Half      e_phnum;        /* Number of program header entries. */
  63         Elf32_Half      e_shentsize;    /* Size of section header entry. */
  64         Elf32_Half      e_shnum;        /* Number of section header entries. */
  65         Elf32_Half      e_shstrndx;     /* Section name strings section. */
  66 } Elf32_Ehdr;
  67
  68 /*
  69  * Section header.
  70  */
  71
  72 typedef struct {
  73         Elf32_Word      sh_name;        /* Section name (index into the
  74                                            section header string table). */
  75         Elf32_Word      sh_type;        /* Section type. */
  76         Elf32_Word      sh_flags;       /* Section flags. */
  77         Elf32_Addr      sh_addr;        /* Address in memory image. */
  78         Elf32_Off       sh_offset;      /* Offset in file. */
  79         Elf32_Size      sh_size;        /* Size in bytes. */
  80         Elf32_Word      sh_link;        /* Index of a related section. */
  81         Elf32_Word      sh_info;        /* Depends on section type. */
  82         Elf32_Size      sh_addralign;   /* Alignment in bytes. */
  83         Elf32_Size      sh_entsize;     /* Size of each entry in section. */
  84 } Elf32_Shdr;
  85
  86 /*
  87  * Program header.
  88  */
  89
  90 typedef struct {
  91         Elf32_Word      p_type;         /* Entry type. */
  92         Elf32_Off       p_offset;       /* File offset of contents. */
  93         Elf32_Addr      p_vaddr;        /* Virtual address in memory image. */
  94         Elf32_Addr      p_paddr;        /* Physical address (not used). */
  95         Elf32_Size      p_filesz;       /* Size of contents in file. */
  96         Elf32_Size      p_memsz;        /* Size of contents in memory. */
  97         Elf32_Word      p_flags;        /* Access permission flags. */
  98         Elf32_Size      p_align;        /* Alignment in memory and file. */
  99 } Elf32_Phdr;
 100
 101 /*
 102  * Dynamic structure.  The ".dynamic" section contains an array of them.
 103  */
 104
 105 typedef struct {
 106         Elf32_Sword     d_tag;          /* Entry type. */
 107         union {
 108                 Elf32_Size      d_val;  /* Integer value. */
 109                 Elf32_Addr      d_ptr;  /* Address value. */
 110         } d_un;
 111 } Elf32_Dyn;
 112
 113 /*
 114  * Relocation entries.
 115  */
 116
 117 /* Relocations that don't need an addend field. */
 118 typedef struct {
 119         Elf32_Addr      r_offset;       /* Location to be relocated. */
 120         Elf32_Word      r_info;         /* Relocation type and symbol index. */
 121 } Elf32_Rel;
 122
 123 /* Relocations that need an addend field. */
 124 typedef struct {
 125         Elf32_Addr      r_offset;       /* Location to be relocated. */
 126         Elf32_Word      r_info;         /* Relocation type and symbol index. */
 127         Elf32_Sword     r_addend;       /* Addend. */
 128 } Elf32_Rela;
 129
 130 /* Macros for accessing the fields of r_info. */
 131 #define ELF32_R_SYM(info)       ((info) >> 8)
 132 #define ELF32_R_TYPE(info)      ((unsigned char)(info))
 133
 134 /* Macro for constructing r_info from field values. */
 135 #define ELF32_R_INFO(sym, type) (((sym) << 8) + (unsigned char)(type))
 136
 137 /*
 138  * Symbol table entries.
 139  */
 140
 141 typedef struct {
 142         Elf32_Word      st_name;        /* String table index of name. */
 143         Elf32_Addr      st_value;       /* Symbol value. */
 144         Elf32_Size      st_size;        /* Size of associated object. */
 145         unsigned char   st_info;        /* Type and binding information. */
 146         unsigned char   st_other;       /* Reserved (not used). */
 147         Elf32_Half      st_shndx;       /* Section index of symbol. */
 148 } Elf32_Sym;
 149
 150 /* Macros for accessing the fields of st_info. */
 151 #define ELF32_ST_BIND(info)             ((info) >> 4)
 152 #define ELF32_ST_TYPE(info)             ((info) & 0xf)
 153
 154 /* Macro for constructing st_info from field values. */
 155 #define ELF32_ST_INFO(bind, type)       (((bind) << 4) + ((type) & 0xf))
 156
 157 #endif /* !_SYS_ELF32_H_ */