elf.h revision 50477 
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: head/sys/i386/include/elf.h 50477 1999-08-28 01:08:13Z peter $
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
52typedef 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