Annotation of src/include/link.h, Revision 1.12
1.12 ! art 1: /* $OpenBSD: link.h,v 1.11 2002/06/03 12:14:30 deraadt Exp $ */
1.2 deraadt 2: /* $NetBSD: link.h,v 1.10 1996/01/09 00:00:11 pk Exp $ */
1.1 deraadt 3:
4: /*
5: * Copyright (c) 1993 Paul Kranenburg
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by Paul Kranenburg.
19: * 4. The name of the author may not be used to endorse or promote products
1.10 deraadt 20: * derived from this software without specific prior written permission
1.1 deraadt 21: *
22: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32: */
33:
34:
35: #ifndef _LINK_H_
36: #define _LINK_H_
1.6 art 37:
1.12 ! art 38: #ifdef __ELF__
! 39: #include <link_elf.h>
! 40: #else
! 41: #include <link_aout.h>
1.6 art 42: #endif
1.1 deraadt 43:
44: /*
1.4 espie 45: * A `Shared Object Descriptor' describes a shared object that is needed
1.1 deraadt 46: * to complete the link edit process of the object containing it.
47: * A list of such objects (chained through `sod_next') is pointed at
48: * by `sdt_sods' in the section_dispatch_table structure.
49: */
50:
51: struct sod { /* Shared Object Descriptor */
52: long sod_name; /* name (relative to load address) */
53: u_int sod_library : 1, /* Searched for by library rules */
54: sod_reserved : 31;
55: short sod_major; /* major version number */
56: short sod_minor; /* minor version number */
57: long sod_next; /* next sod */
58: };
59:
60: /*
61: * `Shared Object Map's are used by the run-time link editor (ld.so) to
62: * keep track of all shared objects loaded into a process' address space.
63: * These structures are only used at run-time and do not occur within
64: * the text or data segment of an executable or shared library.
65: */
66: struct so_map { /* Shared Object Map */
67: caddr_t som_addr; /* Address at which object mapped */
68: char *som_path; /* Path to mmap'ed file */
69: struct so_map *som_next; /* Next map in chain */
70: struct sod *som_sod; /* Sod responsible for this map */
71: caddr_t som_sodbase; /* Base address of this sod */
72: u_int som_write : 1; /* Text is currently writable */
73: struct _dynamic *som_dynamic; /* _dynamic structure */
74: caddr_t som_spd; /* Private data */
75: };
76:
1.7 art 77:
78: /*
79: * Debug rendezvous struct. Pointer to this is set up in the
1.8 art 80: * target code pointed by the DT_DEBUG tag. If it is
1.7 art 81: * defined.
82: */
83: struct r_debug {
84: int r_version; /* Protocol version. */
85: struct link_map *r_map; /* Head of list of loaded objects. */
86:
87: /*
88: * This is the address of a function internal to the run-time linker,
89: * that will always be called when the linker begins to map in a
90: * library or unmap it, and again when the mapping change is complete.
91: * The debugger can set a breakpoint at this address if it wants to
92: * notice shared object mapping changes.
93: */
1.8 art 94: unsigned long r_brk;
1.7 art 95: enum {
96: /*
97: * This state value describes the mapping change taking place
98: * when the `r_brk' address is called.
99: */
100: RT_CONSISTENT, /* Mapping change is complete. */
101: RT_ADD, /* Adding a new object. */
102: RT_DELETE, /* Removing an object mapping. */
103: } r_state;
104:
1.8 art 105: unsigned long r_ldbase; /* Base address the linker is loaded at. */
1.7 art 106: };
1.1 deraadt 107:
108:
109:
110: /*
111: * Maximum number of recognized shared object version numbers.
112: */
113: #define MAXDEWEY 8
114:
115: /*
116: * Header of the hints file.
117: */
118: struct hints_header {
119: long hh_magic;
120: #define HH_MAGIC 011421044151
121: long hh_version; /* Interface version number */
122: #define LD_HINTS_VERSION_1 1
1.2 deraadt 123: #define LD_HINTS_VERSION_2 2
1.1 deraadt 124: long hh_hashtab; /* Location of hash table */
125: long hh_nbucket; /* Number of buckets in hashtab */
126: long hh_strtab; /* Location of strings */
127: long hh_strtab_sz; /* Size of strings */
128: long hh_ehints; /* End of hints (max offset in file) */
1.2 deraadt 129: long hh_dirlist; /* Colon-separated list of srch dirs */
1.1 deraadt 130: };
131:
132: #define HH_BADMAG(hdr) ((hdr).hh_magic != HH_MAGIC)
133:
134: /*
135: * Hash table element in hints file.
136: */
137: struct hints_bucket {
138: /* namex and pathx are indices into the string table */
139: int hi_namex; /* Library name */
140: int hi_pathx; /* Full path */
141: int hi_dewey[MAXDEWEY]; /* The versions */
142: int hi_ndewey; /* Number of version numbers */
143: #define hi_major hi_dewey[0]
144: #define hi_minor hi_dewey[1]
145: int hi_next; /* Next in this bucket */
146: };
147:
148: #define _PATH_LD_HINTS "/var/run/ld.so.hints"
149:
150: #endif /* _LINK_H_ */
151:
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