FreeBSD/Linux Kernel Cross Reference
sys/x86/include/elf.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * 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.
     *
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_ELF_H_
    #define _MACHINE_ELF_H_ 1
    
    #if defined(__i386__) || defined(_MACHINE_ELF_WANT_32BIT)
    
    /*
     * ELF definitions for the i386 architecture.
     */
    
    #include <sys/elf32.h>  /* Definitions common to all 32 bit architectures. */
    #if defined(__ELF_WORD_SIZE) && __ELF_WORD_SIZE == 64
    #include <sys/elf64.h>  /* Definitions common to all 64 bit architectures. */
    #endif
    
    #ifndef __ELF_WORD_SIZE
    #define __ELF_WORD_SIZE 32      /* Used by <sys/elf_generic.h> */
    #endif
    
    #include <sys/elf_generic.h>
    
    #define ELF_ARCH        EM_386
    
    #define ELF_MACHINE_OK(x) ((x) == EM_386 || (x) == EM_486)
    
    /*
     * Auxiliary vector entries for passing information to the interpreter.
     *
     * The i386 supplement to the SVR4 ABI specification names this "auxv_t",
     * but POSIX lays claim to all symbols ending with "_t".
     */
    
    typedef struct {        /* Auxiliary vector entry on initial stack */
            int     a_type;                 /* Entry type. */
            union {
                    long    a_val;          /* Integer value. */
                    void    *a_ptr;         /* Address. */
                    void    (*a_fcn)(void); /* Function pointer (not used). */
            } a_un;
    } Elf32_Auxinfo;
    
    #if __ELF_WORD_SIZE == 64
    /* Fake for amd64 loader support */
    typedef struct {
            int fake;
    } Elf64_Auxinfo;
    #endif
    
    __ElfType(Auxinfo);
    
    /* Values for a_type. */
    #define AT_NULL         0       /* Terminates the vector. */
    #define AT_IGNORE       1       /* Ignored entry. */
    #define AT_EXECFD       2       /* File descriptor of program to load. */
    #define AT_PHDR         3       /* Program header of program already loaded. */
    #define AT_PHENT        4       /* Size of each program header entry. */
    #define AT_PHNUM        5       /* Number of program header entries. */
    #define AT_PAGESZ       6       /* Page size in bytes. */
    #define AT_BASE         7       /* Interpreter's base address. */
    #define AT_FLAGS        8       /* Flags (unused for i386). */
    #define AT_ENTRY        9       /* Where interpreter should transfer control. */
    #define AT_NOTELF       10      /* Program is not ELF ?? */
    #define AT_UID          11      /* Real uid. */
    #define AT_EUID         12      /* Effective uid. */
    #define AT_GID          13      /* Real gid. */
    #define AT_EGID         14      /* Effective gid. */
    #define AT_EXECPATH     15      /* Path to the executable. */
    #define AT_CANARY       16      /* Canary for SSP. */
    #define AT_CANARYLEN    17      /* Length of the canary. */
    #define AT_OSRELDATE    18      /* OSRELDATE. */
   #define AT_NCPUS        19      /* Number of CPUs. */
   #define AT_PAGESIZES    20      /* Pagesizes. */
   #define AT_PAGESIZESLEN 21      /* Number of pagesizes. */
   #define AT_TIMEKEEP     22      /* Pointer to timehands. */
   #define AT_STACKPROT    23      /* Initial stack protection. */
   #define AT_EHDRFLAGS    24      /* e_flags field from elf hdr */
   #define AT_HWCAP        25      /* CPU feature flags. */
   #define AT_HWCAP2       26      /* CPU feature flags 2. */
   
   #define AT_COUNT        27      /* Count of defined aux entry types. */
   
   /*
    * Relocation types.
    */
   
   #define R_386_COUNT     38      /* Count of defined relocation types. */
   
   /* Define "machine" characteristics */
   #define ELF_TARG_CLASS  ELFCLASS32
   #define ELF_TARG_DATA   ELFDATA2LSB
   #define ELF_TARG_MACH   EM_386
   #define ELF_TARG_VER    1
   
   #define ET_DYN_LOAD_ADDR 0x01001000
   
   #elif defined(__amd64__)
   
   /*
    * ELF definitions for the AMD64 architecture.
    */
   
   #ifndef __ELF_WORD_SIZE
   #define __ELF_WORD_SIZE 64      /* Used by <sys/elf_generic.h> */
   #endif
   #include <sys/elf32.h>  /* Definitions common to all 32 bit architectures. */
   #include <sys/elf64.h>  /* Definitions common to all 64 bit architectures. */
   #include <sys/elf_generic.h>
   
   #define ELF_ARCH        EM_X86_64
   #define ELF_ARCH32      EM_386
   
   #define ELF_MACHINE_OK(x) ((x) == EM_X86_64)
   
   /*
    * Auxiliary vector entries for passing information to the interpreter.
    *
    * The i386 supplement to the SVR4 ABI specification names this "auxv_t",
    * but POSIX lays claim to all symbols ending with "_t".
    */
   typedef struct {        /* Auxiliary vector entry on initial stack */
           int     a_type;                 /* Entry type. */
           union {
                   int     a_val;          /* Integer value. */
           } a_un;
   } Elf32_Auxinfo;
   
   
   typedef struct {        /* Auxiliary vector entry on initial stack */
           long    a_type;                 /* Entry type. */
           union {
                   long    a_val;          /* Integer value. */
                   void    *a_ptr;         /* Address. */
                   void    (*a_fcn)(void); /* Function pointer (not used). */
           } a_un;
   } Elf64_Auxinfo;
   
   __ElfType(Auxinfo);
   
   /* Values for a_type. */
   #define AT_NULL         0       /* Terminates the vector. */
   #define AT_IGNORE       1       /* Ignored entry. */
   #define AT_EXECFD       2       /* File descriptor of program to load. */
   #define AT_PHDR         3       /* Program header of program already loaded. */
   #define AT_PHENT        4       /* Size of each program header entry. */
   #define AT_PHNUM        5       /* Number of program header entries. */
   #define AT_PAGESZ       6       /* Page size in bytes. */
   #define AT_BASE         7       /* Interpreter's base address. */
   #define AT_FLAGS        8       /* Flags (unused for i386). */
   #define AT_ENTRY        9       /* Where interpreter should transfer control. */
   #define AT_NOTELF       10      /* Program is not ELF ?? */
   #define AT_UID          11      /* Real uid. */
   #define AT_EUID         12      /* Effective uid. */
   #define AT_GID          13      /* Real gid. */
   #define AT_EGID         14      /* Effective gid. */
   #define AT_EXECPATH     15      /* Path to the executable. */
   #define AT_CANARY       16      /* Canary for SSP */
   #define AT_CANARYLEN    17      /* Length of the canary. */
   #define AT_OSRELDATE    18      /* OSRELDATE. */
   #define AT_NCPUS        19      /* Number of CPUs. */
   #define AT_PAGESIZES    20      /* Pagesizes. */
   #define AT_PAGESIZESLEN 21      /* Number of pagesizes. */
   #define AT_TIMEKEEP     22      /* Pointer to timehands. */
   #define AT_STACKPROT    23      /* Initial stack protection. */
   #define AT_EHDRFLAGS    24      /* e_flags field from elf hdr */
   #define AT_HWCAP        25      /* CPU feature flags. */
   #define AT_HWCAP2       26      /* CPU feature flags 2. */
   
   #define AT_COUNT        27      /* Count of defined aux entry types. */
   
   /*
    * Relocation types.
    */
   
   #define R_X86_64_COUNT  24      /* Count of defined relocation types. */
   
   /* Define "machine" characteristics */
   #if __ELF_WORD_SIZE == 32
   #define ELF_TARG_CLASS  ELFCLASS32
   #else
   #define ELF_TARG_CLASS  ELFCLASS64
   #endif
   #define ELF_TARG_DATA   ELFDATA2LSB
   #define ELF_TARG_MACH   EM_X86_64
   #define ELF_TARG_VER    1
   
   #if __ELF_WORD_SIZE == 32
   #define ET_DYN_LOAD_ADDR 0x01001000
   #else
   #define ET_DYN_LOAD_ADDR 0x01021000
   #endif
   
   #endif /* __i386__, __amd64__ */
   
   #endif /* !_MACHINE_ELF_H_ */

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