The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/elf.h

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    1 /*-
    2  * Copyright (c) 1996-1997 John D. Polstra.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/5.2/sys/i386/include/elf.h 120422 2003-09-25 01:10:26Z peter $
   27  */
   28 
   29 #ifndef _MACHINE_ELF_H_
   30 #define _MACHINE_ELF_H_ 1
   31 
   32 /*
   33  * ELF definitions for the i386 architecture.
   34  */
   35 
   36 #include <sys/elf32.h>  /* Definitions common to all 32 bit architectures. */
   37 #if defined(__ELF_WORD_SIZE) && __ELF_WORD_SIZE == 64
   38 #include <sys/elf64.h>  /* Definitions common to all 64 bit architectures. */
   39 #endif
   40 
   41 #ifndef __ELF_WORD_SIZE
   42 #define __ELF_WORD_SIZE 32      /* Used by <sys/elf_generic.h> */
   43 #endif
   44 
   45 #include <sys/elf_generic.h>
   46 
   47 #define ELF_ARCH        EM_386
   48 
   49 #define ELF_MACHINE_OK(x) ((x) == EM_386 || (x) == EM_486)
   50 
   51 /*
   52  * Auxiliary vector entries for passing information to the interpreter.
   53  *
   54  * The i386 supplement to the SVR4 ABI specification names this "auxv_t",
   55  * but POSIX lays claim to all symbols ending with "_t".
   56  */
   57 
   58 typedef struct {        /* Auxiliary vector entry on initial stack */
   59         int     a_type;                 /* Entry type. */
   60         union {
   61                 long    a_val;          /* Integer value. */
   62                 void    *a_ptr;         /* Address. */
   63                 void    (*a_fcn)(void); /* Function pointer (not used). */
   64         } a_un;
   65 } Elf32_Auxinfo;
   66 
   67 #if __ELF_WORD_SIZE == 64
   68 /* Fake for amd64 loader support */
   69 typedef struct {
   70         int fake;
   71 } Elf64_Auxinfo;
   72 #endif
   73 
   74 __ElfType(Auxinfo);
   75 
   76 /* Values for a_type. */
   77 #define AT_NULL         0       /* Terminates the vector. */
   78 #define AT_IGNORE       1       /* Ignored entry. */
   79 #define AT_EXECFD       2       /* File descriptor of program to load. */
   80 #define AT_PHDR         3       /* Program header of program already loaded. */
   81 #define AT_PHENT        4       /* Size of each program header entry. */
   82 #define AT_PHNUM        5       /* Number of program header entries. */
   83 #define AT_PAGESZ       6       /* Page size in bytes. */
   84 #define AT_BASE         7       /* Interpreter's base address. */
   85 #define AT_FLAGS        8       /* Flags (unused for i386). */
   86 #define AT_ENTRY        9       /* Where interpreter should transfer control. */
   87 
   88 /*
   89  * The following non-standard values are used for passing information
   90  * from John Polstra's testbed program to the dynamic linker.  These
   91  * are expected to go away soon.
   92  *
   93  * Unfortunately, these overlap the Linux non-standard values, so they
   94  * must not be used in the same context.
   95  */
   96 #define AT_BRK          10      /* Starting point for sbrk and brk. */
   97 #define AT_DEBUG        11      /* Debugging level. */
   98 
   99 /*
  100  * The following non-standard values are used in Linux ELF binaries.
  101  */
  102 #define AT_NOTELF       10      /* Program is not ELF ?? */
  103 #define AT_UID          11      /* Real uid. */
  104 #define AT_EUID         12      /* Effective uid. */
  105 #define AT_GID          13      /* Real gid. */
  106 #define AT_EGID         14      /* Effective gid. */
  107 
  108 #define AT_COUNT        15      /* Count of defined aux entry types. */
  109 
  110 /*
  111  * Relocation types.
  112  */
  113 
  114 #define R_386_NONE      0       /* No relocation. */
  115 #define R_386_32        1       /* Add symbol value. */
  116 #define R_386_PC32      2       /* Add PC-relative symbol value. */
  117 #define R_386_GOT32     3       /* Add PC-relative GOT offset. */
  118 #define R_386_PLT32     4       /* Add PC-relative PLT offset. */
  119 #define R_386_COPY      5       /* Copy data from shared object. */
  120 #define R_386_GLOB_DAT  6       /* Set GOT entry to data address. */
  121 #define R_386_JMP_SLOT  7       /* Set GOT entry to code address. */
  122 #define R_386_RELATIVE  8       /* Add load address of shared object. */
  123 #define R_386_GOTOFF    9       /* Add GOT-relative symbol address. */
  124 #define R_386_GOTPC     10      /* Add PC-relative GOT table address. */
  125 
  126 #define R_386_COUNT     11      /* Count of defined relocation types. */
  127 
  128 /* Define "machine" characteristics */
  129 #define ELF_TARG_CLASS  ELFCLASS32
  130 #define ELF_TARG_DATA   ELFDATA2LSB
  131 #define ELF_TARG_MACH   EM_386
  132 #define ELF_TARG_VER    1
  133 
  134 #endif /* !_MACHINE_ELF_H_ */

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