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

     /*-
      * Copyright (c) 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.
     *
     * $FreeBSD$
     */
    
    #ifndef _SYS_ELF_COMMON_H_
    #define _SYS_ELF_COMMON_H_ 1
    
    /*
     * ELF definitions that are independent of architecture or word size.
     */
    
    /*
     * Note header.  The ".note" section contains an array of notes.  Each
     * begins with this header, aligned to a word boundary.  Immediately
     * following the note header is n_namesz bytes of name, padded to the
     * next word boundary.  Then comes n_descsz bytes of descriptor, again
     * padded to a word boundary.  The values of n_namesz and n_descsz do
     * not include the padding.
     */
    
    typedef struct {
            u_int32_t       n_namesz;       /* Length of name. */
            u_int32_t       n_descsz;       /* Length of descriptor. */
            u_int32_t       n_type;         /* Type of this note. */
    } Elf_Note;
    
    /* 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. */
    #define EI_NIDENT       16      /* Size of e_ident array. */
    
    /* 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 */
   #define EM_ALPHA        0x9026  /* Alpha */
   
   /* 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 */
   
   /* Flags for sh_flags. */
   #define SHF_WRITE       0x1             /* Section contains writable data. */
   #define SHF_ALLOC       0x2             /* Section occupies memory. */
   #define SHF_EXECINSTR   0x4             /* Section contains instructions. */
   #define SHF_MASKPROC    0xf0000000      /* Reserved for processor-specific. */
   
   /* 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. */
   
   /* 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 ElfNN_Rela relocations. */
   #define DT_RELASZ       8       /* Total size of ElfNN_Rela relocations. */
   #define DT_RELAENT      9       /* Size of each ElfNN_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 ElfNN_Rel relocations. */
   #define DT_RELSZ        18      /* Total size of ElfNN_Rel relocations. */
   #define DT_RELENT       19      /* Size of each ElfNN_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. */
   
   /* Values for n_type.  Used in core files. */
   #define NT_PRSTATUS     1       /* Process status. */
   #define NT_FPREGSET     2       /* Floating point registers. */
   #define NT_PRPSINFO     3       /* Process state info. */
   
   /* Symbol Binding - ELFNN_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 - ELFNN_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_ELF_COMMON_H_ */

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