FreeBSD/Linux Kernel Cross Reference
sys/i386/include/elf.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: releng/5.0/sys/i386/include/elf.h 97564 2002-05-30 08:32:18Z dfr $
     */
    
    #ifndef _MACHINE_ELF_H_
    #define _MACHINE_ELF_H_ 1
    
    /*
     * ELF definitions for the i386 architecture.
     */
    
    #include <sys/elf32.h>  /* Definitions common to all 32 bit architectures. */
    
    #define __ELF_WORD_SIZE 32      /* Used by <sys/elf_generic.h> */
    #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;
    
    __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. */
    
    /*
     * The following non-standard values are used for passing information
     * from John Polstra's testbed program to the dynamic linker.  These
     * are expected to go away soon.
     *
     * Unfortunately, these overlap the Linux non-standard values, so they
     * must not be used in the same context.
     */
    #define AT_BRK          10      /* Starting point for sbrk and brk. */
    #define AT_DEBUG        11      /* Debugging level. */
    
    /*
     * The following non-standard values are used in Linux ELF binaries.
     */
    #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_COUNT        15      /* Count of defined aux entry types. */
    
    /*
     * Relocation types.
     */
   
   #define R_386_NONE      0       /* No relocation. */
   #define R_386_32        1       /* Add symbol value. */
   #define R_386_PC32      2       /* Add PC-relative symbol value. */
   #define R_386_GOT32     3       /* Add PC-relative GOT offset. */
   #define R_386_PLT32     4       /* Add PC-relative PLT offset. */
   #define R_386_COPY      5       /* Copy data from shared object. */
   #define R_386_GLOB_DAT  6       /* Set GOT entry to data address. */
   #define R_386_JMP_SLOT  7       /* Set GOT entry to code address. */
   #define R_386_RELATIVE  8       /* Add load address of shared object. */
   #define R_386_GOTOFF    9       /* Add GOT-relative symbol address. */
   #define R_386_GOTPC     10      /* Add PC-relative GOT table address. */
   
   #define R_386_COUNT     11      /* 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
   
   #ifdef _KERNEL
   
   /*
    * On the i386 we load the dynamic linker where a userland call
    * to mmap(0, ...) would put it.  The rationale behind this
    * calculation is that it leaves room for the heap to grow to
    * its maximum allowed size.
    */
   #define ELF_RTLD_ADDR(vmspace) \
       (round_page((vm_offset_t)(vmspace)->vm_daddr + maxdsiz))
   
   #endif /* _KERNEL */
   #endif /* !_MACHINE_ELF_H_ */

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