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: src/sys/i386/include/elf.h,v 1.2.2.2 1999/09/05 08:11:46 peter Exp $
   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 
   38 /*
   39  * Auxiliary vector entries for passing information to the interpreter.
   40  *
   41  * The i386 supplement to the SVR4 ABI specification names this "auxv_t",
   42  * but POSIX lays claim to all symbols ending with "_t".
   43  */
   44 
   45 typedef struct {        /* Auxiliary vector entry on initial stack */
   46         int     a_type;                 /* Entry type. */
   47         union {
   48                 long    a_val;          /* Integer value. */
   49                 void    *a_ptr;         /* Address. */
   50                 void    (*a_fcn)(void); /* Function pointer (not used). */
   51         } a_un;
   52 } Elf32_Auxinfo;
   53 
   54 /* Values for a_type. */
   55 #define AT_NULL         0       /* Terminates the vector. */
   56 #define AT_IGNORE       1       /* Ignored entry. */
   57 #define AT_EXECFD       2       /* File descriptor of program to load. */
   58 #define AT_PHDR         3       /* Program header of program already loaded. */
   59 #define AT_PHENT        4       /* Size of each program header entry. */
   60 #define AT_PHNUM        5       /* Number of program header entries. */
   61 #define AT_PAGESZ       6       /* Page size in bytes. */
   62 #define AT_BASE         7       /* Interpreter's base address. */
   63 #define AT_FLAGS        8       /* Flags (unused for i386). */
   64 #define AT_ENTRY        9       /* Where interpreter should transfer control. */
   65 
   66 /*
   67  * The following non-standard values are used for passing information
   68  * from John Polstra's testbed program to the dynamic linker.  These
   69  * are expected to go away soon.
   70  *
   71  * Unfortunately, these overlap the Linux non-standard values, so they
   72  * must not be used in the same context.
   73  */
   74 #define AT_BRK          10      /* Starting point for sbrk and brk. */
   75 #define AT_DEBUG        11      /* Debugging level. */
   76 
   77 /*
   78  * The following non-standard values are used in Linux ELF binaries.
   79  */
   80 #define AT_NOTELF       10      /* Program is not ELF ?? */
   81 #define AT_UID          11      /* Real uid. */
   82 #define AT_EUID         12      /* Effective uid. */
   83 #define AT_GID          13      /* Real gid. */
   84 #define AT_EGID         14      /* Effective gid. */
   85 
   86 #define AT_COUNT        15      /* Count of defined aux entry types. */
   87 
   88 /*
   89  * Relocation types.
   90  */
   91 
   92 #define R_386_NONE      0       /* No relocation. */
   93 #define R_386_32        1       /* Add symbol value. */
   94 #define R_386_PC32      2       /* Add PC-relative symbol value. */
   95 #define R_386_GOT32     3       /* Add PC-relative GOT offset. */
   96 #define R_386_PLT32     4       /* Add PC-relative PLT offset. */
   97 #define R_386_COPY      5       /* Copy data from shared object. */
   98 #define R_386_GLOB_DAT  6       /* Set GOT entry to data address. */
   99 #define R_386_JMP_SLOT  7       /* Set GOT entry to code address. */
  100 #define R_386_RELATIVE  8       /* Add load address of shared object. */
  101 #define R_386_GOTOFF    9       /* Add GOT-relative symbol address. */
  102 #define R_386_GOTPC     10      /* Add PC-relative GOT table address. */
  103 
  104 #define R_386_COUNT     11      /* Count of defined relocation types. */
  105 
  106 /* Define "machine" characteristics */
  107 #define ELF_TARG_CLASS  ELFCLASS32
  108 #define ELF_TARG_DATA   ELFDATA2LSB
  109 #define ELF_TARG_MACH   EM_386
  110 #define ELF_TARG_VER    1
  111 
  112 #endif /* !_MACHINE_ELF_H_ */

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