link_elf.h revision 276908 
1/*-
2 * Copyright (c) 1993 Paul Kranenburg
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 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *      This product includes software developed by Paul Kranenburg.
16 * 4. The name of the author may not be used to endorse or promote products
17 *    derived from this software without specific prior written permission
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 * $FreeBSD: stable/10/sys/sys/link_elf.h 276908 2015-01-10 09:22:17Z kib $
31 */
32
33/*
34 * RRS section definitions.
35 *
36 * The layout of some data structures defined in this header file is
37 * such that we can provide compatibility with the SunOS 4.x shared
38 * library scheme.
39 */
40
41#ifndef _SYS_LINK_ELF_H_
42#define	_SYS_LINK_ELF_H_
43
44#include <sys/elf.h>
45
46/*
47 * Flags that describe the origin of the entries in Dl_serinfo.
48 * SunOS has these in <sys/link.h>, we follow the suit.
49 */
50#define	LA_SER_ORIG	0x01	/* original (needed) name */
51#define	LA_SER_LIBPATH	0x02	/* LD_LIBRARY_PATH entry prepended */
52#define	LA_SER_RUNPATH	0x04	/* runpath entry prepended */
53#define	LA_SER_CONFIG	0x08	/* configuration entry prepended */
54#define	LA_SER_DEFAULT	0x40	/* default path prepended */
55#define	LA_SER_SECURE	0x80	/* default (secure) path prepended */
56
57typedef struct link_map {
58	caddr_t		l_addr;			/* Base Address of library */
59#ifdef __mips__
60	caddr_t		l_offs;			/* Load Offset of library */
61#endif
62	const char	*l_name;		/* Absolute Path to Library */
63	const void	*l_ld;			/* Pointer to .dynamic in memory */
64	struct link_map	*l_next, *l_prev;	/* linked list of of mapped libs */
65} Link_map;
66
67struct r_debug {
68	int		r_version;		/* not used */
69	struct link_map *r_map;			/* list of loaded images */
70	void		(*r_brk)(struct r_debug *, struct link_map *);
71						/* pointer to break point */
72	enum {
73		RT_CONSISTENT,			/* things are stable */
74		RT_ADD,				/* adding a shared library */
75		RT_DELETE			/* removing a shared library */
76	}		r_state;
77};
78
79struct dl_phdr_info
80{
81	Elf_Addr dlpi_addr;			/* module relocation base */
82	const char *dlpi_name;			/* module name */
83	const Elf_Phdr *dlpi_phdr;		/* pointer to module's phdr */
84	Elf_Half dlpi_phnum;			/* number of entries in phdr */
85	unsigned long long int dlpi_adds;	/* total # of loads */
86	unsigned long long int dlpi_subs;	/* total # of unloads */
87	size_t dlpi_tls_modid;
88	void *dlpi_tls_data;
89};
90
91__BEGIN_DECLS
92
93typedef int (*__dl_iterate_hdr_callback)(struct dl_phdr_info *, size_t, void *);
94extern int dl_iterate_phdr(__dl_iterate_hdr_callback, void *);
95int _rtld_addr_phdr(const void *, struct dl_phdr_info *);
96int _rtld_get_stack_prot(void);
97int _rtld_is_dlopened(void *);
98
99#ifdef __ARM_EABI__
100void * dl_unwind_find_exidx(const void *, int *);
101#endif
102
103__END_DECLS
104
105#endif /* _SYS_LINK_ELF_H_ */
106