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 1.25 2011/01/07 14:22:34 kib Exp $ 27 */ 28 29 #ifndef _CPU_ELF_H_ 30 #define _CPU_ELF_H_ 31 32 /* 33 * ELF definitions for the x86_64 architecture. 34 */ 35 36 37 #ifndef __ELF_WORD_SIZE 38 #define __ELF_WORD_SIZE 64 /* Used by <sys/elf_generic.h> */ 39 #endif 40 #include <sys/elf32.h> /* Definitions common to all 32 bit architectures. */ 41 #include <sys/elf64.h> /* Definitions common to all 64 bit architectures. */ 42 #include <sys/elf_generic.h> 43 44 #define ELF_ARCH EM_X86_64 45 46 #define ELF_MACHINE_OK(x) ((x) == EM_X86_64) 47 48 /* 49 * Auxiliary vector entries for passing information to the interpreter. 50 * 51 * The i386 supplement to the SVR4 ABI specification names this "auxv_t", 52 * but POSIX lays claim to all symbols ending with "_t". 53 */ 54 typedef struct { /* Auxiliary vector entry on initial stack */ 55 int a_type; /* Entry type. */ 56 union { 57 int a_val; /* Integer value. */ 58 } a_un; 59 } Elf32_Auxinfo; 60 61 62 typedef struct { /* Auxiliary vector entry on initial stack */ 63 long a_type; /* Entry type. */ 64 union { 65 long a_val; /* Integer value. */ 66 void *a_ptr; /* Address. */ 67 void (*a_fcn)(void); /* Function pointer (not used). */ 68 } a_un; 69 } Elf64_Auxinfo; 70 71 __ElfType(Auxinfo); 72 73 /* Values for a_type. */ 74 #define AT_NULL 0 /* Terminates the vector. */ 75 #define AT_IGNORE 1 /* Ignored entry. */ 76 #define AT_EXECFD 2 /* File descriptor of program to load. */ 77 #define AT_PHDR 3 /* Program header of program already loaded. */ 78 #define AT_PHENT 4 /* Size of each program header entry. */ 79 #define AT_PHNUM 5 /* Number of program header entries. */ 80 #define AT_PAGESZ 6 /* Page size in bytes. */ 81 #define AT_BASE 7 /* Interpreter's base address. */ 82 #define AT_FLAGS 8 /* Flags (unused for i386). */ 83 #define AT_ENTRY 9 /* Where interpreter should transfer control. */ 84 85 /* 86 * The following non-standard values are used for passing information 87 * from John Polstra's testbed program to the dynamic linker. These 88 * are expected to go away soon. 89 * 90 * Unfortunately, these overlap the Linux non-standard values, so they 91 * must not be used in the same context. 92 */ 93 #define AT_BRK 10 /* Starting point for sbrk and brk. */ 94 #define AT_DEBUG 11 /* Debugging level. */ 95 96 /* 97 * The following non-standard values are used in Linux ELF binaries. 98 * Types 16-17 and 19-23 are not implemented in the kernel 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 #define AT_EXECPATH 15 /* Path to the executable. */ 106 #define AT_CANARY 16 /* Canary for SSP */ 107 #define AT_CANARYLEN 17 /* Length of the canary. */ 108 #define AT_OSRELDATE 18 /* OSRELDATE. */ 109 #define AT_NCPUS 19 /* Number of CPUs. */ 110 #define AT_PAGESIZES 20 /* Pagesizes. */ 111 #define AT_PAGESIZESLEN 21 /* Number of pagesizes. */ 112 #define AT_STACKPROT 23 /* Initial stack protection. */ 113 114 #define AT_COUNT 24 /* Count of defined aux entry types. */ 115 116 /* 117 * Relocation types. 118 */ 119 120 #define R_X86_64_NONE 0 /* No relocation. */ 121 #define R_X86_64_64 1 /* Add 64 bit symbol value. */ 122 #define R_X86_64_PC32 2 /* PC-relative 32 bit signed sym value. */ 123 #define R_X86_64_GOT32 3 /* PC-relative 32 bit GOT offset. */ 124 #define R_X86_64_PLT32 4 /* PC-relative 32 bit PLT offset. */ 125 #define R_X86_64_COPY 5 /* Copy data from shared object. */ 126 #define R_X86_64_GLOB_DAT 6 /* Set GOT entry to data address. */ 127 #define R_X86_64_JMP_SLOT 7 /* Set GOT entry to code address. */ 128 #define R_X86_64_RELATIVE 8 /* Add load address of shared object. */ 129 #define R_X86_64_GOTPCREL 9 /* Add 32 bit signed pcrel offset to GOT. */ 130 #define R_X86_64_32 10 /* Add 32 bit zero extended symbol value */ 131 #define R_X86_64_32S 11 /* Add 32 bit sign extended symbol value */ 132 #define R_X86_64_16 12 /* Add 16 bit zero extended symbol value */ 133 #define R_X86_64_PC16 13 /* Add 16 bit signed extended pc relative symbol value */ 134 #define R_X86_64_8 14 /* Add 8 bit zero extended symbol value */ 135 #define R_X86_64_PC8 15 /* Add 8 bit signed extended pc relative symbol value */ 136 #define R_X86_64_DTPMOD64 16 /* ID of module containing symbol */ 137 #define R_X86_64_DTPOFF64 17 /* Offset in TLS block */ 138 #define R_X86_64_TPOFF64 18 /* Offset in static TLS block */ 139 #define R_X86_64_TLSGD 19 /* PC relative offset to GD GOT entry */ 140 #define R_X86_64_TLSLD 20 /* PC relative offset to LD GOT entry */ 141 #define R_X86_64_DTPOFF32 21 /* Offset in TLS block */ 142 #define R_X86_64_GOTTPOFF 22 /* PC relative offset to IE GOT entry */ 143 #define R_X86_64_TPOFF32 23 /* Offset in static TLS block */ 144 #define R_X86_64_IRELATIVE 37 145 146 #define R_X86_64_COUNT 38 /* Count of defined relocation types. */ 147 148 /* Define "machine" characteristics */ 149 #if __ELF_WORD_SIZE == 32 150 #define ELF_TARG_CLASS ELFCLASS32 151 #else 152 #define ELF_TARG_CLASS ELFCLASS64 153 #endif 154 #define ELF_TARG_DATA ELFDATA2LSB 155 #define ELF_TARG_MACH EM_X86_64 156 #define ELF_TARG_VER 1 157 158 /* 159 * x86_64 load base for PIE binaries 160 */ 161 #define ET_DYN_LOAD_ADDR 0x01021000 162 163 #ifdef _KERNEL 164 /* 165 * On the i386 we load the dynamic linker where a userland call 166 * to mmap(0, ...) would put it. The rationale behind this 167 * calculation is that it leaves room for the heap to grow to 168 * its maximum allowed size. 169 */ 170 #define ELF_RTLD_ADDR(vmspace) \ 171 (round_page((vm_offset_t)(vmspace)->vm_daddr + maxdsiz)) 172 173 #endif /* _KERNEL */ 174 #endif /* !_CPU_ELF_H_ */ 175