sys/cpu/i386/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/i386/include/elf.h,v 1.9.2.1 2001/11/03 01:41:08 ps Exp $
  27  * $DragonFly: src/sys/cpu/i386/include/elf.h,v 1.8 2006/11/07 06:43:22 dillon Exp $
  28  */
  29
  30 #ifndef _CPU_ELF_H_
  31 #define _CPU_ELF_H_
  32
  33 /*
  34  * ELF definitions for the i386 architecture.
  35  */
  36
  37 #include <sys/elf32.h>  /* Definitions common to all 32 bit architectures. */
  38 #include <sys/elf64.h>  /* Definitions common to all 64 bit architectures. */
  39
  40 #ifndef __ELF_WORD_SIZE
  41 #define __ELF_WORD_SIZE 32      /* Used by <sys/elf_generic.h> */
  42 #endif
  43
  44 #include <sys/elf_generic.h>
  45
  46 #define ELF_ARCH        EM_386
  47
  48 #define ELF_MACHINE_OK(x) ((x) == EM_386)
  49
  50 /*
  51  * Auxiliary vector entries for passing information to the interpreter.
  52  *
  53  * The i386 supplement to the SVR4 ABI specification names this "auxv_t",
  54  * but POSIX lays claim to all symbols ending with "_t".
  55  */
  56
  57 typedef struct {        /* Auxiliary vector entry on initial stack */
  58         int     a_type;                 /* Entry type. */
  59         union {
  60                 long    a_val;          /* Integer value. */
  61                 void    *a_ptr;         /* Address. */
  62                 void    (*a_fcn)(void); /* Function pointer (not used). */
  63         } a_un;
  64 } Elf32_Auxinfo;
  65
  66 #if __ELF_WORD_SIZE == 64
  67 /* Fake for amd64 loader support */
  68 typedef struct {
  69         int fake;
  70 } Elf64_Auxinfo;
  71 #endif
  72
  73 __ElfType(Auxinfo);
  74
  75 /* Values for a_type. */
  76 #define AT_NULL         0       /* Terminates the vector. */
  77 #define AT_IGNORE       1       /* Ignored entry. */
  78 #define AT_EXECFD       2       /* File descriptor of program to load. */
  79 #define AT_PHDR         3       /* Program header of program already loaded. */
  80 #define AT_PHENT        4       /* Size of each program header entry. */
  81 #define AT_PHNUM        5       /* Number of program header entries. */
  82 #define AT_PAGESZ       6       /* Page size in bytes. */
  83 #define AT_BASE         7       /* Interpreter's base address. */
  84 #define AT_FLAGS        8       /* Flags (unused for i386). */
  85 #define AT_ENTRY        9       /* Where interpreter should transfer control. */
  86
  87 /*
  88  * The following non-standard values are used for passing information
  89  * from John Polstra's testbed program to the dynamic linker.  These
  90  * are expected to go away soon.
  91  *
  92  * Unfortunately, these overlap the Linux non-standard values, so they
  93  * must not be used in the same context.
  94  */
  95 #define AT_BRK          10      /* Starting point for sbrk and brk. */
  96 #define AT_DEBUG        11      /* Debugging level. */
  97
  98 /*
  99  * The following non-standard values are used in Linux ELF binaries.
 100  */
 101 #define AT_NOTELF       10      /* Program is not ELF ?? */
 102 #define AT_UID          11      /* Real uid. */
 103 #define AT_EUID         12      /* Effective uid. */
 104 #define AT_GID          13      /* Real gid. */
 105 #define AT_EGID         14      /* Effective gid. */
 106
 107 #define AT_COUNT        15      /* Count of defined aux entry types. */
 108
 109 /*
 110  * Relocation types.
 111  */
 112
 113 #define R_386_NONE      0       /* No relocation. */
 114 #define R_386_32        1       /* Add symbol value. */
 115 #define R_386_PC32      2       /* Add PC-relative symbol value. */
 116 #define R_386_GOT32     3       /* Add PC-relative GOT offset. */
 117 #define R_386_PLT32     4       /* Add PC-relative PLT offset. */
 118 #define R_386_COPY      5       /* Copy data from shared object. */
 119 #define R_386_GLOB_DAT  6       /* Set GOT entry to data address. */
 120 #define R_386_JMP_SLOT  7       /* Set GOT entry to code address. */
 121 #define R_386_RELATIVE  8       /* Add load address of shared object. */
 122 #define R_386_GOTOFF    9       /* Add GOT-relative symbol address. */
 123 #define R_386_GOTPC     10      /* Add PC-relative GOT table address. */
 124 #define R_386_TLS_TPOFF 14      /* Negative offset in static TLS block */
 125 #define R_386_TLS_IE    15      /* Absolute address of GOT for -ve static TLS */
 126 #define R_386_TLS_GOTIE 16      /* GOT entry for negative static TLS block */
 127 #define R_386_TLS_LE    17      /* Negative offset relative to static TLS */
 128 #define R_386_TLS_GD    18      /* 32 bit offset to GOT (index,off) pair */
 129 #define R_386_TLS_LDM   19      /* 32 bit offset to GOT (index,zero) pair */
 130 #define R_386_TLS_GD_32 24      /* 32 bit offset to GOT (index,off) pair */
 131 #define R_386_TLS_GD_PUSH 25    /* pushl instruction for Sun ABI GD sequence */
 132 #define R_386_TLS_GD_CALL 26    /* call instruction for Sun ABI GD sequence */
 133 #define R_386_TLS_GD_POP 27     /* popl instruction for Sun ABI GD sequence */
 134 #define R_386_TLS_LDM_32 28     /* 32 bit offset to GOT (index,zero) pair */
 135 #define R_386_TLS_LDM_PUSH 29   /* pushl instruction for Sun ABI LD sequence */
 136 #define R_386_TLS_LDM_CALL 30   /* call instruction for Sun ABI LD sequence */
 137 #define R_386_TLS_LDM_POP 31    /* popl instruction for Sun ABI LD sequence */
 138 #define R_386_TLS_LDO_32 32     /* 32 bit offset from start of TLS block */
 139 #define R_386_TLS_IE_32 33      /* 32 bit offset to GOT static TLS offset entry */
 140 #define R_386_TLS_LE_32 34      /* 32 bit offset within static TLS block */
 141 #define R_386_TLS_DTPMOD32 35   /* GOT entry containing TLS index */
 142 #define R_386_TLS_DTPOFF32 36   /* GOT entry containing TLS offset */
 143 #define R_386_TLS_TPOFF32 37    /* GOT entry of -ve static TLS offset */
 144
 145 #define R_386_COUNT     38      /* Count of defined relocation types. */
 146
 147 /* Define "machine" characteristics */
 148 #define ELF_TARG_CLASS  ELFCLASS32
 149 #define ELF_TARG_DATA   ELFDATA2LSB
 150 #define ELF_TARG_MACH   EM_386
 151 #define ELF_TARG_VER    1
 152
 153 #ifdef _KERNEL
 154
 155 /*
 156  * On the i386 we load the dynamic linker where a userland call
 157  * to mmap(0, ...) would put it.  The rationale behind this
 158  * calculation is that it leaves room for the heap to grow to
 159  * its maximum allowed size.
 160  */
 161 #define ELF_RTLD_ADDR(vmspace) \
 162     (round_page((vm_offset_t)(vmspace)->vm_daddr + maxdsiz))
 163
 164 #endif /* _KERNEL */
 165 #endif /* !_CPU_ELF_H_ */