xref: /freebsd/sys/x86/include/elf.h (revision f126890ac5386406dadf7c4cfa9566cbb56537c5)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 1996-1997 John D. Polstra.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 
29 #ifndef _MACHINE_ELF_H_
30 #define	_MACHINE_ELF_H_ 1
31 
32 #if defined(__i386__) || defined(_MACHINE_ELF_WANT_32BIT)
33 /* ELF definitions for the i386 architecture. */
34 #include <sys/elf32.h>	/* Definitions common to all 32 bit architectures. */
35 #if defined(__ELF_WORD_SIZE) && __ELF_WORD_SIZE == 64
36 /* Definitions common to all 64 bit architectures. */
37 #include <sys/elf64.h>
38 #endif
39 
40 #ifndef __ELF_WORD_SIZE
41 #define	__ELF_WORD_SIZE	32	/* Used by <sys/elf_generic.h> */
42 #endif
43 
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 
57 typedef 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 
66 #if __ELF_WORD_SIZE == 64
67 /* Fake for amd64 loader support */
68 typedef struct {
69 	int fake;
70 } Elf64_Auxinfo;
71 #endif
72 
73 __ElfType(Auxinfo);
74 
75 /*
76  * Relocation types.
77  */
78 
79 #define	R_386_COUNT	38	/* Count of defined relocation types. */
80 
81 /* Define "machine" characteristics */
82 #define	ELF_TARG_CLASS	ELFCLASS32
83 #define	ELF_TARG_DATA	ELFDATA2LSB
84 #define	ELF_TARG_MACH	EM_386
85 #define	ELF_TARG_VER	1
86 
87 #define	ET_DYN_LOAD_ADDR 0x00002000
88 
89 #elif defined(__amd64__)
90 
91 /*
92  * ELF definitions for the AMD64 architecture.
93  */
94 
95 #ifndef __ELF_WORD_SIZE
96 #define	__ELF_WORD_SIZE	64	/* Used by <sys/elf_generic.h> */
97 #endif
98 #include <sys/elf32.h>	/* Definitions common to all 32 bit architectures. */
99 #include <sys/elf64.h>	/* Definitions common to all 64 bit architectures. */
100 #include <sys/elf_generic.h>
101 
102 #define	ELF_ARCH	EM_X86_64
103 #define	ELF_ARCH32	EM_386
104 
105 #define	ELF_MACHINE_OK(x) ((x) == EM_X86_64)
106 
107 /*
108  * Auxiliary vector entries for passing information to the interpreter.
109  *
110  * The i386 supplement to the SVR4 ABI specification names this "auxv_t",
111  * but POSIX lays claim to all symbols ending with "_t".
112  */
113 typedef struct {	/* Auxiliary vector entry on initial stack */
114 	int	a_type;			/* Entry type. */
115 	union {
116 		int	a_val;		/* Integer value. */
117 	} a_un;
118 } Elf32_Auxinfo;
119 
120 typedef struct {	/* Auxiliary vector entry on initial stack */
121 	long	a_type;			/* Entry type. */
122 	union {
123 		long	a_val;		/* Integer value. */
124 		void	*a_ptr;		/* Address. */
125 		void	(*a_fcn)(void);	/* Function pointer (not used). */
126 	} a_un;
127 } Elf64_Auxinfo;
128 
129 __ElfType(Auxinfo);
130 
131 /*
132  * Relocation types.
133  */
134 
135 #define	R_X86_64_COUNT	24	/* Count of defined relocation types. */
136 
137 /* Define "machine" characteristics */
138 #if __ELF_WORD_SIZE == 32
139 #define ELF_TARG_CLASS  ELFCLASS32
140 #else
141 #define ELF_TARG_CLASS  ELFCLASS64
142 #endif
143 #define	ELF_TARG_DATA	ELFDATA2LSB
144 #define	ELF_TARG_MACH	EM_X86_64
145 #define	ELF_TARG_VER	1
146 
147 #if __ELF_WORD_SIZE == 32
148 #define	ET_DYN_LOAD_ADDR 0x00002000
149 #else
150 #define	ET_DYN_LOAD_ADDR 0x01021000
151 #endif
152 
153 #endif /* __i386__, __amd64__ */
154 
155 #endif /* !_MACHINE_ELF_H_ */
156