sys/cpu/amd64/include/elf.h

   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/amd64/include/elf.h,v 1.18 2004/08/03 08:21:48 dfr Exp $
  27  * $DragonFly: src/sys/cpu/amd64/include/elf.h,v 1.2 2007/09/23 04:29:30 yanyh Exp $
  28  */
  29
  30 #ifndef _CPU_ELF_H_
  31 #define _CPU_ELF_H_
  32
  33 /*
  34  * ELF definitions for the AMD64 architecture.
  35  */
  36
  37
  38 #ifndef __ELF_WORD_SIZE
  39 #define __ELF_WORD_SIZE 64      /* Used by <sys/elf_generic.h> */
  40 #endif
  41 #include <sys/elf32.h>  /* Definitions common to all 32 bit architectures. */
  42 #include <sys/elf64.h>  /* Definitions common to all 64 bit architectures. */
  43 #include <sys/elf_generic.h>
  44
  45 #define ELF_ARCH        EM_X86_64
  46
  47 #define ELF_MACHINE_OK(x) ((x) == EM_X86_64)
  48
  49 /*
  50  * Auxiliary vector entries for passing information to the interpreter.
  51  *
  52  * The i386 supplement to the SVR4 ABI specification names this "auxv_t",
  53  * but POSIX lays claim to all symbols ending with "_t".
  54  */
  55 typedef struct {        /* Auxiliary vector entry on initial stack */
  56         int     a_type;                 /* Entry type. */
  57         union {
  58                 int     a_val;          /* Integer value. */
  59         } a_un;
  60 } Elf32_Auxinfo;
  61
  62
  63 typedef struct {        /* Auxiliary vector entry on initial stack */
  64         long    a_type;                 /* Entry type. */
  65         union {
  66                 long    a_val;          /* Integer value. */
  67                 void    *a_ptr;         /* Address. */
  68                 void    (*a_fcn)(void); /* Function pointer (not used). */
  69         } a_un;
  70 } Elf64_Auxinfo;
  71
  72 __ElfType(Auxinfo);
  73
  74 /* Values for a_type. */
  75 #define AT_NULL         0       /* Terminates the vector. */
  76 #define AT_IGNORE       1       /* Ignored entry. */
  77 #define AT_EXECFD       2       /* File descriptor of program to load. */
  78 #define AT_PHDR         3       /* Program header of program already loaded. */
  79 #define AT_PHENT        4       /* Size of each program header entry. */
  80 #define AT_PHNUM        5       /* Number of program header entries. */
  81 #define AT_PAGESZ       6       /* Page size in bytes. */
  82 #define AT_BASE         7       /* Interpreter's base address. */
  83 #define AT_FLAGS        8       /* Flags (unused for i386). */
  84 #define AT_ENTRY        9       /* Where interpreter should transfer control. */
  85
  86 /*
  87  * The following non-standard values are used for passing information
  88  * from John Polstra's testbed program to the dynamic linker.  These
  89  * are expected to go away soon.
  90  *
  91  * Unfortunately, these overlap the Linux non-standard values, so they
  92  * must not be used in the same context.
  93  */
  94 #define AT_BRK          10      /* Starting point for sbrk and brk. */
  95 #define AT_DEBUG        11      /* Debugging level. */
  96
  97 /*
  98  * The following non-standard values are used in Linux ELF binaries.
  99  */
 100 #define AT_NOTELF       10      /* Program is not ELF ?? */
 101 #define AT_UID          11      /* Real uid. */
 102 #define AT_EUID         12      /* Effective uid. */
 103 #define AT_GID          13      /* Real gid. */
 104 #define AT_EGID         14      /* Effective gid. */
 105
 106 #define AT_COUNT        15      /* Count of defined aux entry types. */
 107
 108 /*
 109  * Relocation types.
 110  */
 111
 112 #define R_X86_64_NONE   0       /* No relocation. */
 113 #define R_X86_64_64     1       /* Add 64 bit symbol value. */
 114 #define R_X86_64_PC32   2       /* PC-relative 32 bit signed sym value. */
 115 #define R_X86_64_GOT32  3       /* PC-relative 32 bit GOT offset. */
 116 #define R_X86_64_PLT32  4       /* PC-relative 32 bit PLT offset. */
 117 #define R_X86_64_COPY   5       /* Copy data from shared object. */
 118 #define R_X86_64_GLOB_DAT 6     /* Set GOT entry to data address. */
 119 #define R_X86_64_JMP_SLOT 7     /* Set GOT entry to code address. */
 120 #define R_X86_64_RELATIVE 8     /* Add load address of shared object. */
 121 #define R_X86_64_GOTPCREL 9     /* Add 32 bit signed pcrel offset to GOT. */
 122 #define R_X86_64_32     10      /* Add 32 bit zero extended symbol value */
 123 #define R_X86_64_32S    11      /* Add 32 bit sign extended symbol value */
 124 #define R_X86_64_16     12      /* Add 16 bit zero extended symbol value */
 125 #define R_X86_64_PC16   13      /* Add 16 bit signed extended pc relative symbol value */
 126 #define R_X86_64_8      14      /* Add 8 bit zero extended symbol value */
 127 #define R_X86_64_PC8    15      /* Add 8 bit signed extended pc relative symbol value */
 128 #define R_X86_64_DTPMOD64 16    /* ID of module containing symbol */
 129 #define R_X86_64_DTPOFF64 17    /* Offset in TLS block */
 130 #define R_X86_64_TPOFF64 18     /* Offset in static TLS block */
 131 #define R_X86_64_TLSGD  19      /* PC relative offset to GD GOT entry */
 132 #define R_X86_64_TLSLD  20      /* PC relative offset to LD GOT entry */
 133 #define R_X86_64_DTPOFF32 21    /* Offset in TLS block */
 134 #define R_X86_64_GOTTPOFF 22    /* PC relative offset to IE GOT entry */
 135 #define R_X86_64_TPOFF32 23     /* Offset in static TLS block */
 136
 137 #define R_X86_64_COUNT  24      /* Count of defined relocation types. */
 138
 139 /* Define "machine" characteristics */
 140 #if __ELF_WORD_SIZE == 32
 141 #define ELF_TARG_CLASS  ELFCLASS32
 142 #else
 143 #define ELF_TARG_CLASS  ELFCLASS64
 144 #endif
 145 #define ELF_TARG_DATA   ELFDATA2LSB
 146 #define ELF_TARG_MACH   EM_X86_64
 147 #define ELF_TARG_VER    1
 148
 149 #ifdef _KERNEL
 150 /*
 151  * On the i386 we load the dynamic linker where a userland call
 152  * to mmap(0, ...) would put it.  The rationale behind this
 153  * calculation is that it leaves room for the heap to grow to
 154  * its maximum allowed size.
 155  */
 156 #define ELF_RTLD_ADDR(vmspace) \
 157         (round_page((vm_offset_t)(vmspace)->vm_daddr + maxdsiz))
 158 #endif
 159
 160 #endif /* !_CPU_ELF_H_ */