2 * Copyright (c) 1996-1997 John D. Polstra.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
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 1.2 2003/06/17 04:28:35 dillon Exp $
30 #ifndef _MACHINE_ELF_H_
31 #define _MACHINE_ELF_H_ 1
34 * ELF definitions for the i386 architecture.
37 #include <sys/elf32.h> /* Definitions common to all 32 bit architectures. */
39 #define __ELF_WORD_SIZE 32 /* Used by <sys/elf_generic.h> */
40 #include <sys/elf_generic.h>
42 #define ELF_ARCH EM_386
44 #define ELF_MACHINE_OK(x) ((x) == EM_386 || (x) == EM_486)
47 * Auxiliary vector entries for passing information to the interpreter.
49 * The i386 supplement to the SVR4 ABI specification names this "auxv_t",
50 * but POSIX lays claim to all symbols ending with "_t".
53 typedef struct { /* Auxiliary vector entry on initial stack */
54 int a_type; /* Entry type. */
56 long a_val; /* Integer value. */
57 void *a_ptr; /* Address. */
58 void (*a_fcn)(void); /* Function pointer (not used). */
64 /* Values for a_type. */
65 #define AT_NULL 0 /* Terminates the vector. */
66 #define AT_IGNORE 1 /* Ignored entry. */
67 #define AT_EXECFD 2 /* File descriptor of program to load. */
68 #define AT_PHDR 3 /* Program header of program already loaded. */
69 #define AT_PHENT 4 /* Size of each program header entry. */
70 #define AT_PHNUM 5 /* Number of program header entries. */
71 #define AT_PAGESZ 6 /* Page size in bytes. */
72 #define AT_BASE 7 /* Interpreter's base address. */
73 #define AT_FLAGS 8 /* Flags (unused for i386). */
74 #define AT_ENTRY 9 /* Where interpreter should transfer control. */
77 * The following non-standard values are used for passing information
78 * from John Polstra's testbed program to the dynamic linker. These
79 * are expected to go away soon.
81 * Unfortunately, these overlap the Linux non-standard values, so they
82 * must not be used in the same context.
84 #define AT_BRK 10 /* Starting point for sbrk and brk. */
85 #define AT_DEBUG 11 /* Debugging level. */
88 * The following non-standard values are used in Linux ELF binaries.
90 #define AT_NOTELF 10 /* Program is not ELF ?? */
91 #define AT_UID 11 /* Real uid. */
92 #define AT_EUID 12 /* Effective uid. */
93 #define AT_GID 13 /* Real gid. */
94 #define AT_EGID 14 /* Effective gid. */
96 #define AT_COUNT 15 /* Count of defined aux entry types. */
102 #define R_386_NONE 0 /* No relocation. */
103 #define R_386_32 1 /* Add symbol value. */
104 #define R_386_PC32 2 /* Add PC-relative symbol value. */
105 #define R_386_GOT32 3 /* Add PC-relative GOT offset. */
106 #define R_386_PLT32 4 /* Add PC-relative PLT offset. */
107 #define R_386_COPY 5 /* Copy data from shared object. */
108 #define R_386_GLOB_DAT 6 /* Set GOT entry to data address. */
109 #define R_386_JMP_SLOT 7 /* Set GOT entry to code address. */
110 #define R_386_RELATIVE 8 /* Add load address of shared object. */
111 #define R_386_GOTOFF 9 /* Add GOT-relative symbol address. */
112 #define R_386_GOTPC 10 /* Add PC-relative GOT table address. */
114 #define R_386_COUNT 11 /* Count of defined relocation types. */
116 /* Define "machine" characteristics */
117 #define ELF_TARG_CLASS ELFCLASS32
118 #define ELF_TARG_DATA ELFDATA2LSB
119 #define ELF_TARG_MACH EM_386
120 #define ELF_TARG_VER 1
125 * On the i386 we load the dynamic linker where a userland call
126 * to mmap(0, ...) would put it. The rationale behind this
127 * calculation is that it leaves room for the heap to grow to
128 * its maximum allowed size.
130 #define ELF_RTLD_ADDR(vmspace) \
131 (round_page((vm_offset_t)(vmspace)->vm_daddr + maxdsiz))
134 #endif /* !_MACHINE_ELF_H_ */