FreeBSD/Linux Kernel Cross Reference
sys/i386/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 * $FreeBSD$
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
52 typedef 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_ */
Cache object: cb086ed81ae02bd2eb7ef08b076df167
|