FreeBSD/Linux Kernel Cross Reference
sys/sys/elf_common.h
1 /*-
2 * Copyright (c) 1998 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 * $FreeBSD$
27 */
28
29 #ifndef _SYS_ELF_COMMON_H_
30 #define _SYS_ELF_COMMON_H_ 1
31
32 /*
33 * ELF definitions that are independent of architecture or word size.
34 */
35
36 /*
37 * Note header. The ".note" section contains an array of notes. Each
38 * begins with this header, aligned to a word boundary. Immediately
39 * following the note header is n_namesz bytes of name, padded to the
40 * next word boundary. Then comes n_descsz bytes of descriptor, again
41 * padded to a word boundary. The values of n_namesz and n_descsz do
42 * not include the padding.
43 */
44
45 typedef struct {
46 u_int32_t n_namesz; /* Length of name. */
47 u_int32_t n_descsz; /* Length of descriptor. */
48 u_int32_t n_type; /* Type of this note. */
49 } Elf_Note;
50
51 /* Indexes into the e_ident array. */
52 #define EI_MAG0 0 /* Magic number, byte 0. */
53 #define EI_MAG1 1 /* Magic number, byte 1. */
54 #define EI_MAG2 2 /* Magic number, byte 2. */
55 #define EI_MAG3 3 /* Magic number, byte 3. */
56 #define EI_CLASS 4 /* Class of machine. */
57 #define EI_DATA 5 /* Data format. */
58 #define EI_VERSION 6 /* ELF format version. */
59 #define EI_PAD 7 /* Start of padding (per SVR4 ABI). */
60 #define EI_BRAND 8 /* Start of architecture identification. */
61 #define EI_NIDENT 16 /* Size of e_ident array. */
62
63 /* Values for the magic number bytes. */
64 #define ELFMAG0 0x7f
65 #define ELFMAG1 'E'
66 #define ELFMAG2 'L'
67 #define ELFMAG3 'F'
68
69 /* Values for e_ident[EI_VERSION] and e_version. */
70 #define EV_NONE 0
71 #define EV_CURRENT 1
72
73 /* Values for e_ident[EI_CLASS]. */
74 #define ELFCLASSNONE 0 /* Unknown class. */
75 #define ELFCLASS32 1 /* 32-bit architecture. */
76 #define ELFCLASS64 2 /* 64-bit architecture. */
77
78 /* Values for e_ident[EI_DATA]. */
79 #define ELFDATANONE 0 /* Unknown data format. */
80 #define ELFDATA2LSB 1 /* 2's complement little-endian. */
81 #define ELFDATA2MSB 2 /* 2's complement big-endian. */
82
83 /* e_ident */
84 #define IS_ELF(ehdr) ((ehdr).e_ident[EI_MAG0] == ELFMAG0 && \
85 (ehdr).e_ident[EI_MAG1] == ELFMAG1 && \
86 (ehdr).e_ident[EI_MAG2] == ELFMAG2 && \
87 (ehdr).e_ident[EI_MAG3] == ELFMAG3)
88
89 /* Values for e_type. */
90 #define ET_NONE 0 /* Unknown type. */
91 #define ET_REL 1 /* Relocatable. */
92 #define ET_EXEC 2 /* Executable. */
93 #define ET_DYN 3 /* Shared object. */
94 #define ET_CORE 4 /* Core file. */
95
96 /* Values for e_machine. */
97 #define EM_NONE 0 /* Unknown machine. */
98 #define EM_M32 1 /* AT&T WE32100. */
99 #define EM_SPARC 2 /* Sun SPARC. */
100 #define EM_386 3 /* Intel i386. */
101 #define EM_68K 4 /* Motorola 68000. */
102 #define EM_88K 5 /* Motorola 88000. */
103 #define EM_486 6 /* Intel i486. */
104 #define EM_860 7 /* Intel i860. */
105 #define EM_MIPS 8 /* MIPS R3000 Big-Endian only */
106
107 /* Extensions */
108 #define EM_MIPS_RS4_BE 10 /* MIPS R4000 Big-Endian */
109 #define EM_SPARC64 11 /* SPARC v9 64-bit unoffical */
110 #define EM_PARISC 15 /* HPPA */
111 #define EM_PPC 20 /* PowerPC */
112 #define EM_ALPHA 0x9026 /* Alpha */
113
114 /* Special section indexes. */
115 #define SHN_UNDEF 0 /* Undefined, missing, irrelevant. */
116 #define SHN_LORESERVE 0xff00 /* First of reserved range. */
117 #define SHN_LOPROC 0xff00 /* First processor-specific. */
118 #define SHN_HIPROC 0xff1f /* Last processor-specific. */
119 #define SHN_ABS 0xfff1 /* Absolute values. */
120 #define SHN_COMMON 0xfff2 /* Common data. */
121 #define SHN_HIRESERVE 0xffff /* Last of reserved range. */
122
123 /* sh_type */
124 #define SHT_NULL 0 /* inactive */
125 #define SHT_PROGBITS 1 /* program defined information */
126 #define SHT_SYMTAB 2 /* symbol table section */
127 #define SHT_STRTAB 3 /* string table section */
128 #define SHT_RELA 4 /* relocation section with addends*/
129 #define SHT_HASH 5 /* symbol hash table section */
130 #define SHT_DYNAMIC 6 /* dynamic section */
131 #define SHT_NOTE 7 /* note section */
132 #define SHT_NOBITS 8 /* no space section */
133 #define SHT_REL 9 /* relation section without addends */
134 #define SHT_SHLIB 10 /* reserved - purpose unknown */
135 #define SHT_DYNSYM 11 /* dynamic symbol table section */
136 #define SHT_LOPROC 0x70000000 /* reserved range for processor */
137 #define SHT_HIPROC 0x7fffffff /* specific section header types */
138 #define SHT_LOUSER 0x80000000 /* reserved range for application */
139 #define SHT_HIUSER 0xffffffff /* specific indexes */
140
141 /* Flags for sh_flags. */
142 #define SHF_WRITE 0x1 /* Section contains writable data. */
143 #define SHF_ALLOC 0x2 /* Section occupies memory. */
144 #define SHF_EXECINSTR 0x4 /* Section contains instructions. */
145 #define SHF_MASKPROC 0xf0000000 /* Reserved for processor-specific. */
146
147 /* Values for p_type. */
148 #define PT_NULL 0 /* Unused entry. */
149 #define PT_LOAD 1 /* Loadable segment. */
150 #define PT_DYNAMIC 2 /* Dynamic linking information segment. */
151 #define PT_INTERP 3 /* Pathname of interpreter. */
152 #define PT_NOTE 4 /* Auxiliary information. */
153 #define PT_SHLIB 5 /* Reserved (not used). */
154 #define PT_PHDR 6 /* Location of program header itself. */
155
156 #define PT_COUNT 7 /* Number of defined p_type values. */
157
158 #define PT_LOPROC 0x70000000 /* First processor-specific type. */
159 #define PT_HIPROC 0x7fffffff /* Last processor-specific type. */
160
161 /* Values for p_flags. */
162 #define PF_X 0x1 /* Executable. */
163 #define PF_W 0x2 /* Writable. */
164 #define PF_R 0x4 /* Readable. */
165
166 /* Values for d_tag. */
167 #define DT_NULL 0 /* Terminating entry. */
168 #define DT_NEEDED 1 /* String table offset of a needed shared
169 library. */
170 #define DT_PLTRELSZ 2 /* Total size in bytes of PLT relocations. */
171 #define DT_PLTGOT 3 /* Processor-dependent address. */
172 #define DT_HASH 4 /* Address of symbol hash table. */
173 #define DT_STRTAB 5 /* Address of string table. */
174 #define DT_SYMTAB 6 /* Address of symbol table. */
175 #define DT_RELA 7 /* Address of ElfNN_Rela relocations. */
176 #define DT_RELASZ 8 /* Total size of ElfNN_Rela relocations. */
177 #define DT_RELAENT 9 /* Size of each ElfNN_Rela relocation entry. */
178 #define DT_STRSZ 10 /* Size of string table. */
179 #define DT_SYMENT 11 /* Size of each symbol table entry. */
180 #define DT_INIT 12 /* Address of initialization function. */
181 #define DT_FINI 13 /* Address of finalization function. */
182 #define DT_SONAME 14 /* String table offset of shared object
183 name. */
184 #define DT_RPATH 15 /* String table offset of library path. */
185 #define DT_SYMBOLIC 16 /* Indicates "symbolic" linking. */
186 #define DT_REL 17 /* Address of ElfNN_Rel relocations. */
187 #define DT_RELSZ 18 /* Total size of ElfNN_Rel relocations. */
188 #define DT_RELENT 19 /* Size of each ElfNN_Rel relocation. */
189 #define DT_PLTREL 20 /* Type of relocation used for PLT. */
190 #define DT_DEBUG 21 /* Reserved (not used). */
191 #define DT_TEXTREL 22 /* Indicates there may be relocations in
192 non-writable segments. */
193 #define DT_JMPREL 23 /* Address of PLT relocations. */
194
195 #define DT_COUNT 24 /* Number of defined d_tag values. */
196
197 /* Values for n_type. Used in core files. */
198 #define NT_PRSTATUS 1 /* Process status. */
199 #define NT_FPREGSET 2 /* Floating point registers. */
200 #define NT_PRPSINFO 3 /* Process state info. */
201
202 /* Symbol Binding - ELFNN_ST_BIND - st_info */
203 #define STB_LOCAL 0 /* Local symbol */
204 #define STB_GLOBAL 1 /* Global symbol */
205 #define STB_WEAK 2 /* like global - lower precedence */
206 #define STB_LOPROC 13 /* reserved range for processor */
207 #define STB_HIPROC 15 /* specific symbol bindings */
208
209 /* Symbol type - ELFNN_ST_TYPE - st_info */
210 #define STT_NOTYPE 0 /* Unspecified type. */
211 #define STT_OBJECT 1 /* Data object. */
212 #define STT_FUNC 2 /* Function. */
213 #define STT_SECTION 3 /* Section. */
214 #define STT_FILE 4 /* Source file. */
215 #define STT_LOPROC 13 /* reserved range for processor */
216 #define STT_HIPROC 15 /* specific symbol types */
217
218 /* Special symbol table indexes. */
219 #define STN_UNDEF 0 /* Undefined symbol index. */
220
221 #endif /* !_SYS_ELF_COMMON_H_ */
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