Fully synchronize sys/boot from FreeBSD-5.x, but add / to the module path
[dragonfly.git] / sys / cpu / i386 / include / elf.h
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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 $
dc62b251 27 * $DragonFly: src/sys/cpu/i386/include/elf.h,v 1.3 2003/11/10 06:12:12 dillon Exp $
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28 */
29
30#ifndef _MACHINE_ELF_H_
31#define _MACHINE_ELF_H_ 1
32
33/*
34 * ELF definitions for the i386 architecture.
35 */
36
37#include <sys/elf32.h> /* Definitions common to all 32 bit architectures. */
dc62b251 38#include <sys/elf64.h> /* Definitions common to all 32 bit architectures. */
984263bc 39
dc62b251 40#ifndef __ELF_WORD_SIZE
984263bc 41#define __ELF_WORD_SIZE 32 /* Used by <sys/elf_generic.h> */
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42#endif
43
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44#include <sys/elf_generic.h>
45
46#define ELF_ARCH EM_386
47
48#define ELF_MACHINE_OK(x) ((x) == EM_386 || (x) == EM_486)
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
57typedef 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
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66#if __ELF_WORD_SIZE == 64
67/* Fake for amd64 loader support */
68typedef struct {
69 int fake;
70} Elf64_Auxinfo;
71#endif
72
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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
125#define R_386_COUNT 11 /* Count of defined relocation types. */
126
127/* Define "machine" characteristics */
128#define ELF_TARG_CLASS ELFCLASS32
129#define ELF_TARG_DATA ELFDATA2LSB
130#define ELF_TARG_MACH EM_386
131#define ELF_TARG_VER 1
132
133#ifdef _KERNEL
134
135/*
136 * On the i386 we load the dynamic linker where a userland call
137 * to mmap(0, ...) would put it. The rationale behind this
138 * calculation is that it leaves room for the heap to grow to
139 * its maximum allowed size.
140 */
141#define ELF_RTLD_ADDR(vmspace) \
142 (round_page((vm_offset_t)(vmspace)->vm_daddr + maxdsiz))
143
144#endif /* _KERNEL */
145#endif /* !_MACHINE_ELF_H_ */