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 * $FreeBSD$ 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 #define __ELF_WORD_SIZE 32 /* Used by <sys/elf_generic.h> */ 39 #include <sys/elf_generic.h> 40 41 #define ELF_ARCH EM_386 42 43 #define ELF_MACHINE_OK(x) ((x) == EM_386 || (x) == EM_486) 44 45 /* 46 * Auxiliary vector entries for passing information to the interpreter. 47 * 48 * The i386 supplement to the SVR4 ABI specification names this "auxv_t", 49 * but POSIX lays claim to all symbols ending with "_t". 50 */ 51 52 typedef struct { /* Auxiliary vector entry on initial stack */ 53 int a_type; /* Entry type. */ 54 union { 55 long a_val; /* Integer value. */ 56 void *a_ptr; /* Address. */ 57 void (*a_fcn)(void); /* Function pointer (not used). */ 58 } a_un; 59 } Elf32_Auxinfo; 60 61 __ElfType(Auxinfo); 62 63 /* Values for a_type. */ 64 #define AT_NULL 0 /* Terminates the vector. */ 65 #define AT_IGNORE 1 /* Ignored entry. */ 66 #define AT_EXECFD 2 /* File descriptor of program to load. */ 67 #define AT_PHDR 3 /* Program header of program already loaded. */ 68 #define AT_PHENT 4 /* Size of each program header entry. */ 69 #define AT_PHNUM 5 /* Number of program header entries. */ 70 #define AT_PAGESZ 6 /* Page size in bytes. */ 71 #define AT_BASE 7 /* Interpreter's base address. */ 72 #define AT_FLAGS 8 /* Flags (unused for i386). */ 73 #define AT_ENTRY 9 /* Where interpreter should transfer control. */ 74 75 /* 76 * The following non-standard values are used for passing information 77 * from John Polstra's testbed program to the dynamic linker. These 78 * are expected to go away soon. 79 * 80 * Unfortunately, these overlap the Linux non-standard values, so they 81 * must not be used in the same context. 82 */ 83 #define AT_BRK 10 /* Starting point for sbrk and brk. */ 84 #define AT_DEBUG 11 /* Debugging level. */ 85 86 /* 87 * The following non-standard values are used in Linux ELF binaries. 88 */ 89 #define AT_NOTELF 10 /* Program is not ELF ?? */ 90 #define AT_UID 11 /* Real uid. */ 91 #define AT_EUID 12 /* Effective uid. */ 92 #define AT_GID 13 /* Real gid. */ 93 #define AT_EGID 14 /* Effective gid. */ 94 95 #define AT_COUNT 15 /* Count of defined aux entry types. */ 96 97 /* 98 * Relocation types. 99 */ 100 101 #define R_386_NONE 0 /* No relocation. */ 102 #define R_386_32 1 /* Add symbol value. */ 103 #define R_386_PC32 2 /* Add PC-relative symbol value. */ 104 #define R_386_GOT32 3 /* Add PC-relative GOT offset. */ 105 #define R_386_PLT32 4 /* Add PC-relative PLT offset. */ 106 #define R_386_COPY 5 /* Copy data from shared object. */ 107 #define R_386_GLOB_DAT 6 /* Set GOT entry to data address. */ 108 #define R_386_JMP_SLOT 7 /* Set GOT entry to code address. */ 109 #define R_386_RELATIVE 8 /* Add load address of shared object. */ 110 #define R_386_GOTOFF 9 /* Add GOT-relative symbol address. */ 111 #define R_386_GOTPC 10 /* Add PC-relative GOT table address. */ 112 113 #define R_386_COUNT 11 /* Count of defined relocation types. */ 114 115 /* Define "machine" characteristics */ 116 #define ELF_TARG_CLASS ELFCLASS32 117 #define ELF_TARG_DATA ELFDATA2LSB 118 #define ELF_TARG_MACH EM_386 119 #define ELF_TARG_VER 1 120 121 #ifdef _KERNEL 122 123 /* 124 * On the i386 we load the dynamic linker where a userland call 125 * to mmap(0, ...) would put it. The rationale behind this 126 * calculation is that it leaves room for the heap to grow to 127 * its maximum allowed size. 128 */ 129 #define ELF_RTLD_ADDR(vmspace) \ 130 (round_page((vm_offset_t)(vmspace)->vm_daddr + maxdsiz)) 131 132 #endif /* _KERNEL */ 133 #endif /* !_MACHINE_ELF_H_ */ 134