FreeBSD/Linux Kernel Cross Reference
sys/sys/elf32.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 1996-1998 John D. Polstra.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/12.0/sys/sys/elf32.h 326256 2017-11-27 15:01:59Z pfg $
     */
    
    #ifndef _SYS_ELF32_H_
    #define _SYS_ELF32_H_ 1
    
    #include <sys/elf_common.h>
    
    /*
     * ELF definitions common to all 32-bit architectures.
     */
    
    typedef uint32_t        Elf32_Addr;
    typedef uint16_t        Elf32_Half;
    typedef uint32_t        Elf32_Off;
    typedef int32_t         Elf32_Sword;
    typedef uint32_t        Elf32_Word;
    typedef uint64_t        Elf32_Lword;
    
    typedef Elf32_Word      Elf32_Hashelt;
    
    /* Non-standard class-dependent datatype used for abstraction. */
    typedef Elf32_Word      Elf32_Size;
    typedef Elf32_Sword     Elf32_Ssize;
    
    /*
     * ELF header.
     */
    
    typedef struct {
            unsigned char   e_ident[EI_NIDENT];     /* File identification. */
            Elf32_Half      e_type;         /* File type. */
            Elf32_Half      e_machine;      /* Machine architecture. */
            Elf32_Word      e_version;      /* ELF format version. */
            Elf32_Addr      e_entry;        /* Entry point. */
            Elf32_Off       e_phoff;        /* Program header file offset. */
            Elf32_Off       e_shoff;        /* Section header file offset. */
            Elf32_Word      e_flags;        /* Architecture-specific flags. */
            Elf32_Half      e_ehsize;       /* Size of ELF header in bytes. */
            Elf32_Half      e_phentsize;    /* Size of program header entry. */
            Elf32_Half      e_phnum;        /* Number of program header entries. */
            Elf32_Half      e_shentsize;    /* Size of section header entry. */
            Elf32_Half      e_shnum;        /* Number of section header entries. */
            Elf32_Half      e_shstrndx;     /* Section name strings section. */
    } Elf32_Ehdr;
    
    /*
     * Shared object information, found in SHT_MIPS_LIBLIST.
     */
    
    typedef struct {
            Elf32_Word l_name;              /* The name of a shared object. */
            Elf32_Word l_time_stamp;        /* 32-bit timestamp. */
            Elf32_Word l_checksum;          /* Checksum of visible symbols, sizes. */
            Elf32_Word l_version;           /* Interface version string index. */
            Elf32_Word l_flags;             /* Flags (LL_*). */
    } Elf32_Lib;
    
    /*
     * Section header.
     */
    
    typedef struct {
            Elf32_Word      sh_name;        /* Section name (index into the
                                               section header string table). */
            Elf32_Word      sh_type;        /* Section type. */
            Elf32_Word      sh_flags;       /* Section flags. */
            Elf32_Addr      sh_addr;        /* Address in memory image. */
            Elf32_Off       sh_offset;      /* Offset in file. */
            Elf32_Word      sh_size;        /* Size in bytes. */
            Elf32_Word      sh_link;        /* Index of a related section. */
            Elf32_Word      sh_info;        /* Depends on section type. */
           Elf32_Word      sh_addralign;   /* Alignment in bytes. */
           Elf32_Word      sh_entsize;     /* Size of each entry in section. */
   } Elf32_Shdr;
   
   /*
    * Program header.
    */
   
   typedef struct {
           Elf32_Word      p_type;         /* Entry type. */
           Elf32_Off       p_offset;       /* File offset of contents. */
           Elf32_Addr      p_vaddr;        /* Virtual address in memory image. */
           Elf32_Addr      p_paddr;        /* Physical address (not used). */
           Elf32_Word      p_filesz;       /* Size of contents in file. */
           Elf32_Word      p_memsz;        /* Size of contents in memory. */
           Elf32_Word      p_flags;        /* Access permission flags. */
           Elf32_Word      p_align;        /* Alignment in memory and file. */
   } Elf32_Phdr;
   
   /*
    * Dynamic structure.  The ".dynamic" section contains an array of them.
    */
   
   typedef struct {
           Elf32_Sword     d_tag;          /* Entry type. */
           union {
                   Elf32_Word      d_val;  /* Integer value. */
                   Elf32_Addr      d_ptr;  /* Address value. */
           } d_un;
   } Elf32_Dyn;
   
   /*
    * Relocation entries.
    */
   
   /* Relocations that don't need an addend field. */
   typedef struct {
           Elf32_Addr      r_offset;       /* Location to be relocated. */
           Elf32_Word      r_info;         /* Relocation type and symbol index. */
   } Elf32_Rel;
   
   /* Relocations that need an addend field. */
   typedef struct {
           Elf32_Addr      r_offset;       /* Location to be relocated. */
           Elf32_Word      r_info;         /* Relocation type and symbol index. */
           Elf32_Sword     r_addend;       /* Addend. */
   } Elf32_Rela;
   
   /* Macros for accessing the fields of r_info. */
   #define ELF32_R_SYM(info)       ((info) >> 8)
   #define ELF32_R_TYPE(info)      ((unsigned char)(info))
   
   /* Macro for constructing r_info from field values. */
   #define ELF32_R_INFO(sym, type) (((sym) << 8) + (unsigned char)(type))
   
   /*
    *      Note entry header
    */
   typedef Elf_Note Elf32_Nhdr;
   
   /*
    *      Move entry
    */
   typedef struct {
           Elf32_Lword     m_value;        /* symbol value */
           Elf32_Word      m_info;         /* size + index */
           Elf32_Word      m_poffset;      /* symbol offset */
           Elf32_Half      m_repeat;       /* repeat count */
           Elf32_Half      m_stride;       /* stride info */
   } Elf32_Move;
   
   /*
    *      The macros compose and decompose values for Move.r_info
    *
    *      sym = ELF32_M_SYM(M.m_info)
    *      size = ELF32_M_SIZE(M.m_info)
    *      M.m_info = ELF32_M_INFO(sym, size)
    */
   #define ELF32_M_SYM(info)       ((info)>>8)
   #define ELF32_M_SIZE(info)      ((unsigned char)(info))
   #define ELF32_M_INFO(sym, size) (((sym)<<8)+(unsigned char)(size))
   
   /*
    *      Hardware/Software capabilities entry
    */
   typedef struct {
           Elf32_Word      c_tag;          /* how to interpret value */
           union {
                   Elf32_Word      c_val;
                   Elf32_Addr      c_ptr;
           } c_un;
   } Elf32_Cap;
   
   /*
    * Symbol table entries.
    */
   
   typedef struct {
           Elf32_Word      st_name;        /* String table index of name. */
           Elf32_Addr      st_value;       /* Symbol value. */
           Elf32_Word      st_size;        /* Size of associated object. */
           unsigned char   st_info;        /* Type and binding information. */
           unsigned char   st_other;       /* Reserved (not used). */
           Elf32_Half      st_shndx;       /* Section index of symbol. */
   } Elf32_Sym;
   
   /* Macros for accessing the fields of st_info. */
   #define ELF32_ST_BIND(info)             ((info) >> 4)
   #define ELF32_ST_TYPE(info)             ((info) & 0xf)
   
   /* Macro for constructing st_info from field values. */
   #define ELF32_ST_INFO(bind, type)       (((bind) << 4) + ((type) & 0xf))
   
   /* Macro for accessing the fields of st_other. */
   #define ELF32_ST_VISIBILITY(oth)        ((oth) & 0x3)
   
   /* Structures used by Sun & GNU symbol versioning. */
   typedef struct
   {
           Elf32_Half      vd_version;
           Elf32_Half      vd_flags;
           Elf32_Half      vd_ndx;
           Elf32_Half      vd_cnt;
           Elf32_Word      vd_hash;
           Elf32_Word      vd_aux;
           Elf32_Word      vd_next;
   } Elf32_Verdef;
   
   typedef struct
   {
           Elf32_Word      vda_name;
           Elf32_Word      vda_next;
   } Elf32_Verdaux;
   
   typedef struct
   {
           Elf32_Half      vn_version;
           Elf32_Half      vn_cnt;
           Elf32_Word      vn_file;
           Elf32_Word      vn_aux;
           Elf32_Word      vn_next;
   } Elf32_Verneed;
   
   typedef struct
   {
           Elf32_Word      vna_hash;
           Elf32_Half      vna_flags;
           Elf32_Half      vna_other;
           Elf32_Word      vna_name;
           Elf32_Word      vna_next;
   } Elf32_Vernaux;
   
   typedef Elf32_Half Elf32_Versym;
   
   typedef struct {
           Elf32_Half      si_boundto;     /* direct bindings - symbol bound to */
           Elf32_Half      si_flags;       /* per symbol flags */
   } Elf32_Syminfo;
   
   typedef struct {
           Elf32_Word      ch_type;
           Elf32_Word      ch_size;
           Elf32_Word      ch_addralign;
   } Elf32_Chdr;
   
   #endif /* !_SYS_ELF32_H_ */

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