FreeBSD/Linux Kernel Cross Reference
sys/x86/include/elf.h
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: releng/11.2/sys/x86/include/elf.h 325810 2017-11-14 16:03:07Z jhb $
27 */
28
29 #ifndef _MACHINE_ELF_H_
30 #define _MACHINE_ELF_H_ 1
31
32 #if defined(__i386__) || defined(_MACHINE_ELF_WANT_32BIT)
33
34 /*
35 * ELF definitions for the i386 architecture.
36 */
37
38 #include <sys/elf32.h> /* Definitions common to all 32 bit architectures. */
39 #if defined(__ELF_WORD_SIZE) && __ELF_WORD_SIZE == 64
40 #include <sys/elf64.h> /* Definitions common to all 64 bit architectures. */
41 #endif
42
43 #ifndef __ELF_WORD_SIZE
44 #define __ELF_WORD_SIZE 32 /* Used by <sys/elf_generic.h> */
45 #endif
46
47 #include <sys/elf_generic.h>
48
49 #define ELF_ARCH EM_386
50
51 #define ELF_MACHINE_OK(x) ((x) == EM_386 || (x) == EM_486)
52
53 /*
54 * Auxiliary vector entries for passing information to the interpreter.
55 *
56 * The i386 supplement to the SVR4 ABI specification names this "auxv_t",
57 * but POSIX lays claim to all symbols ending with "_t".
58 */
59
60 typedef struct { /* Auxiliary vector entry on initial stack */
61 int a_type; /* Entry type. */
62 union {
63 long a_val; /* Integer value. */
64 void *a_ptr; /* Address. */
65 void (*a_fcn)(void); /* Function pointer (not used). */
66 } a_un;
67 } Elf32_Auxinfo;
68
69 #if __ELF_WORD_SIZE == 64
70 /* Fake for amd64 loader support */
71 typedef struct {
72 int fake;
73 } Elf64_Auxinfo;
74 #endif
75
76 __ElfType(Auxinfo);
77
78 /* Values for a_type. */
79 #define AT_NULL 0 /* Terminates the vector. */
80 #define AT_IGNORE 1 /* Ignored entry. */
81 #define AT_EXECFD 2 /* File descriptor of program to load. */
82 #define AT_PHDR 3 /* Program header of program already loaded. */
83 #define AT_PHENT 4 /* Size of each program header entry. */
84 #define AT_PHNUM 5 /* Number of program header entries. */
85 #define AT_PAGESZ 6 /* Page size in bytes. */
86 #define AT_BASE 7 /* Interpreter's base address. */
87 #define AT_FLAGS 8 /* Flags (unused for i386). */
88 #define AT_ENTRY 9 /* Where interpreter should transfer control. */
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 #define AT_EXECPATH 15 /* Path to the executable. */
95 #define AT_CANARY 16 /* Canary for SSP. */
96 #define AT_CANARYLEN 17 /* Length of the canary. */
97 #define AT_OSRELDATE 18 /* OSRELDATE. */
98 #define AT_NCPUS 19 /* Number of CPUs. */
99 #define AT_PAGESIZES 20 /* Pagesizes. */
100 #define AT_PAGESIZESLEN 21 /* Number of pagesizes. */
101 #define AT_TIMEKEEP 22 /* Pointer to timehands. */
102 #define AT_STACKPROT 23 /* Initial stack protection. */
103 #define AT_EHDRFLAGS 24 /* e_flags field from elf hdr */
104 #define AT_HWCAP 25 /* CPU feature flags. */
105 #define AT_HWCAP2 26 /* CPU feature flags 2. */
106
107 #define AT_COUNT 27 /* Count of defined aux entry types. */
108
109 /*
110 * Relocation types.
111 */
112
113 #define R_386_COUNT 38 /* 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 #define ET_DYN_LOAD_ADDR 0x01001000
122
123 #elif defined(__amd64__)
124
125 /*
126 * ELF definitions for the AMD64 architecture.
127 */
128
129 #ifndef __ELF_WORD_SIZE
130 #define __ELF_WORD_SIZE 64 /* Used by <sys/elf_generic.h> */
131 #endif
132 #include <sys/elf32.h> /* Definitions common to all 32 bit architectures. */
133 #include <sys/elf64.h> /* Definitions common to all 64 bit architectures. */
134 #include <sys/elf_generic.h>
135
136 #define ELF_ARCH EM_X86_64
137 #define ELF_ARCH32 EM_386
138
139 #define ELF_MACHINE_OK(x) ((x) == EM_X86_64)
140
141 /*
142 * Auxiliary vector entries for passing information to the interpreter.
143 *
144 * The i386 supplement to the SVR4 ABI specification names this "auxv_t",
145 * but POSIX lays claim to all symbols ending with "_t".
146 */
147 typedef struct { /* Auxiliary vector entry on initial stack */
148 int a_type; /* Entry type. */
149 union {
150 int a_val; /* Integer value. */
151 } a_un;
152 } Elf32_Auxinfo;
153
154
155 typedef struct { /* Auxiliary vector entry on initial stack */
156 long a_type; /* Entry type. */
157 union {
158 long a_val; /* Integer value. */
159 void *a_ptr; /* Address. */
160 void (*a_fcn)(void); /* Function pointer (not used). */
161 } a_un;
162 } Elf64_Auxinfo;
163
164 __ElfType(Auxinfo);
165
166 /* Values for a_type. */
167 #define AT_NULL 0 /* Terminates the vector. */
168 #define AT_IGNORE 1 /* Ignored entry. */
169 #define AT_EXECFD 2 /* File descriptor of program to load. */
170 #define AT_PHDR 3 /* Program header of program already loaded. */
171 #define AT_PHENT 4 /* Size of each program header entry. */
172 #define AT_PHNUM 5 /* Number of program header entries. */
173 #define AT_PAGESZ 6 /* Page size in bytes. */
174 #define AT_BASE 7 /* Interpreter's base address. */
175 #define AT_FLAGS 8 /* Flags (unused for i386). */
176 #define AT_ENTRY 9 /* Where interpreter should transfer control. */
177 #define AT_NOTELF 10 /* Program is not ELF ?? */
178 #define AT_UID 11 /* Real uid. */
179 #define AT_EUID 12 /* Effective uid. */
180 #define AT_GID 13 /* Real gid. */
181 #define AT_EGID 14 /* Effective gid. */
182 #define AT_EXECPATH 15 /* Path to the executable. */
183 #define AT_CANARY 16 /* Canary for SSP */
184 #define AT_CANARYLEN 17 /* Length of the canary. */
185 #define AT_OSRELDATE 18 /* OSRELDATE. */
186 #define AT_NCPUS 19 /* Number of CPUs. */
187 #define AT_PAGESIZES 20 /* Pagesizes. */
188 #define AT_PAGESIZESLEN 21 /* Number of pagesizes. */
189 #define AT_TIMEKEEP 22 /* Pointer to timehands. */
190 #define AT_STACKPROT 23 /* Initial stack protection. */
191 #define AT_EHDRFLAGS 24 /* e_flags field from elf hdr */
192 #define AT_HWCAP 25 /* CPU feature flags. */
193 #define AT_HWCAP2 26 /* CPU feature flags 2. */
194
195 #define AT_COUNT 27 /* Count of defined aux entry types. */
196
197 /*
198 * Relocation types.
199 */
200
201 #define R_X86_64_COUNT 24 /* Count of defined relocation types. */
202
203 /* Define "machine" characteristics */
204 #if __ELF_WORD_SIZE == 32
205 #define ELF_TARG_CLASS ELFCLASS32
206 #else
207 #define ELF_TARG_CLASS ELFCLASS64
208 #endif
209 #define ELF_TARG_DATA ELFDATA2LSB
210 #define ELF_TARG_MACH EM_X86_64
211 #define ELF_TARG_VER 1
212
213 #if __ELF_WORD_SIZE == 32
214 #define ET_DYN_LOAD_ADDR 0x01001000
215 #else
216 #define ET_DYN_LOAD_ADDR 0x01021000
217 #endif
218
219 #endif /* __i386__, __amd64__ */
220
221 #endif /* !_MACHINE_ELF_H_ */
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