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

     /*-
      * Copyright (c) 1996-1997 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: src/sys/sys/elf32.h,v 1.2.2.3 1999/09/05 08:22:15 peter Exp $
     */
    
    #ifndef _SYS_ELF32_H_
    #define _SYS_ELF32_H_ 1
    
    /*
     * ELF definitions common to all 32-bit architectures.
     */
    
    typedef u_int32_t       Elf32_Addr;
    typedef u_int16_t       Elf32_Half;
    typedef u_int32_t       Elf32_Off;
    typedef int32_t         Elf32_Sword;
    typedef u_int32_t       Elf32_Word;
    
    /*
     * ELF header.
     */
    
    #define EI_NIDENT       16              /* Size of e_ident array. */
    
    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;
    
    /* Indexes into the e_ident array. */
    #define EI_MAG0         0       /* Magic number, byte 0. */
    #define EI_MAG1         1       /* Magic number, byte 1. */
    #define EI_MAG2         2       /* Magic number, byte 2. */
    #define EI_MAG3         3       /* Magic number, byte 3. */
    #define EI_CLASS        4       /* Class of machine. */
    #define EI_DATA         5       /* Data format. */
    #define EI_VERSION      6       /* ELF format version. */
    #define EI_PAD          7       /* Start of padding (per SVR4 ABI). */
    #define EI_BRAND        8       /* Start of architecture identification. */
    
    /* Values for the magic number bytes. */
    #define ELFMAG0         0x7f
    #define ELFMAG1         'E'
    #define ELFMAG2         'L'
    #define ELFMAG3         'F'
    
    /* Values for e_ident[EI_VERSION] and e_version. */
    #define EV_NONE         0
    #define EV_CURRENT      1
    
    /* Values for e_ident[EI_CLASS]. */
    #define ELFCLASSNONE    0       /* Unknown class. */
    #define ELFCLASS32      1       /* 32-bit architecture. */
    #define ELFCLASS64      2       /* 64-bit architecture. */
    
    /* Values for e_ident[EI_DATA]. */
    #define ELFDATANONE     0       /* Unknown data format. */
    #define ELFDATA2LSB     1       /* 2's complement little-endian. */
    #define ELFDATA2MSB     2       /* 2's complement big-endian. */
    
    /* e_ident */
    #define IS_ELF(ehdr)    ((ehdr).e_ident[EI_MAG0] == ELFMAG0 && \
                             (ehdr).e_ident[EI_MAG1] == ELFMAG1 && \
                             (ehdr).e_ident[EI_MAG2] == ELFMAG2 && \
                            (ehdr).e_ident[EI_MAG3] == ELFMAG3)
   
   /* Values for e_type. */
   #define ET_NONE         0       /* Unknown type. */
   #define ET_REL          1       /* Relocatable. */
   #define ET_EXEC         2       /* Executable. */
   #define ET_DYN          3       /* Shared object. */
   #define ET_CORE         4       /* Core file. */
   
   /* Values for e_machine. */
   #define EM_NONE         0       /* Unknown machine. */
   #define EM_M32          1       /* AT&T WE32100. */
   #define EM_SPARC        2       /* Sun SPARC. */
   #define EM_386          3       /* Intel i386. */
   #define EM_68K          4       /* Motorola 68000. */
   #define EM_88K          5       /* Motorola 88000. */
   #define EM_486          6       /* Intel i486. */
   #define EM_860          7       /* Intel i860. */
   #define EM_MIPS         8       /* MIPS R3000 Big-Endian only */
   
   /* Extensions */
   #define EM_MIPS_RS4_BE  10      /* MIPS R4000 Big-Endian */
   #define EM_SPARC64      11      /* SPARC v9 64-bit unoffical */
   #define EM_PARISC       15      /* HPPA */
   #define EM_PPC          20      /* PowerPC */
   
   
   /*
    * 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;
   
   /* Special section indexes. */
   #define SHN_UNDEF            0          /* Undefined, missing, irrelevant. */
   #define SHN_LORESERVE   0xff00          /* First of reserved range. */
   #define SHN_LOPROC      0xff00          /* First processor-specific. */
   #define SHN_HIPROC      0xff1f          /* Last processor-specific. */
   #define SHN_ABS         0xfff1          /* Absolute values. */
   #define SHN_COMMON      0xfff2          /* Common data. */
   #define SHN_HIRESERVE   0xffff          /* Last of reserved range. */
   
   /* sh_type */
   #define SHT_NULL        0               /* inactive */
   #define SHT_PROGBITS    1               /* program defined information */
   #define SHT_SYMTAB      2               /* symbol table section */
   #define SHT_STRTAB      3               /* string table section */
   #define SHT_RELA        4               /* relocation section with addends*/
   #define SHT_HASH        5               /* symbol hash table section */
   #define SHT_DYNAMIC     6               /* dynamic section */ 
   #define SHT_NOTE        7               /* note section */
   #define SHT_NOBITS      8               /* no space section */
   #define SHT_REL         9               /* relation section without addends */
   #define SHT_SHLIB       10              /* reserved - purpose unknown */
   #define SHT_DYNSYM      11              /* dynamic symbol table section */ 
   #define SHT_LOPROC      0x70000000      /* reserved range for processor */
   #define SHT_HIPROC      0x7fffffff      /* specific section header types */
   #define SHT_LOUSER      0x80000000      /* reserved range for application */
   #define SHT_HIUSER      0xffffffff      /* specific indexes */
   
   
   /*
    * 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;
   
   /* Values for p_type. */
   #define PT_NULL         0       /* Unused entry. */
   #define PT_LOAD         1       /* Loadable segment. */
   #define PT_DYNAMIC      2       /* Dynamic linking information segment. */
   #define PT_INTERP       3       /* Pathname of interpreter. */
   #define PT_NOTE         4       /* Auxiliary information. */
   #define PT_SHLIB        5       /* Reserved (not used). */
   #define PT_PHDR         6       /* Location of program header itself. */
   
   #define PT_COUNT        7       /* Number of defined p_type values. */
   
   #define PT_LOPROC       0x70000000      /* First processor-specific type. */
   #define PT_HIPROC       0x7fffffff      /* Last processor-specific type. */
   
   /* Values for p_flags. */
   #define PF_X            0x1     /* Executable. */
   #define PF_W            0x2     /* Writable. */
   #define PF_R            0x4     /* Readable. */
   
   /*
    * 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;
   
   /* Values for d_tag. */
   #define DT_NULL         0       /* Terminating entry. */
   #define DT_NEEDED       1       /* String table offset of a needed shared
                                      library. */
   #define DT_PLTRELSZ     2       /* Total size in bytes of PLT relocations. */
   #define DT_PLTGOT       3       /* Processor-dependent address. */
   #define DT_HASH         4       /* Address of symbol hash table. */
   #define DT_STRTAB       5       /* Address of string table. */
   #define DT_SYMTAB       6       /* Address of symbol table. */
   #define DT_RELA         7       /* Address of Elf32_Rela relocations. */
   #define DT_RELASZ       8       /* Total size of Elf32_Rela relocations. */
   #define DT_RELAENT      9       /* Size of each Elf32_Rela relocation entry. */
   #define DT_STRSZ        10      /* Size of string table. */
   #define DT_SYMENT       11      /* Size of each symbol table entry. */
   #define DT_INIT         12      /* Address of initialization function. */
   #define DT_FINI         13      /* Address of finalization function. */
   #define DT_SONAME       14      /* String table offset of shared object
                                      name. */
   #define DT_RPATH        15      /* String table offset of library path. */
   #define DT_SYMBOLIC     16      /* Indicates "symbolic" linking. */
   #define DT_REL          17      /* Address of Elf32_Rel relocations. */
   #define DT_RELSZ        18      /* Total size of Elf32_Rel relocations. */
   #define DT_RELENT       19      /* Size of each Elf32_Rel relocation. */
   #define DT_PLTREL       20      /* Type of relocation used for PLT. */
   #define DT_DEBUG        21      /* Reserved (not used). */
   #define DT_TEXTREL      22      /* Indicates there may be relocations in
                                      non-writable segments. */
   #define DT_JMPREL       23      /* Address of PLT relocations. */
   
   #define DT_COUNT        24      /* Number of defined d_tag values. */
   
   /*
    * 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))
   
   /*
    * 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))
   
   /* Symbol Binding - ELF32_ST_BIND - st_info */
   #define STB_LOCAL       0       /* Local symbol */
   #define STB_GLOBAL      1       /* Global symbol */
   #define STB_WEAK        2       /* like global - lower precedence */
   #define STB_LOPROC      13      /* reserved range for processor */
   #define STB_HIPROC      15      /*  specific symbol bindings */
   
   /* Symbol type - ELF32_ST_TYPE - st_info */
   #define STT_NOTYPE      0       /* Unspecified type. */
   #define STT_OBJECT      1       /* Data object. */
   #define STT_FUNC        2       /* Function. */
   #define STT_SECTION     3       /* Section. */
   #define STT_FILE        4       /* Source file. */
   #define STT_LOPROC      13      /* reserved range for processor */
   #define STT_HIPROC      15      /*  specific symbol types */
   
   /* Special symbol table indexes. */
   #define STN_UNDEF       0       /* Undefined symbol index. */
   
   #endif /* !_SYS_ELF32_H_ */

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