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/* $OpenBSD: link.h,v 1.15 2013/10/19 09:00:18 deraadt Exp $ */
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/* $NetBSD: link.h,v 1.10 1996/01/09 00:00:11 pk Exp $ */
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/*
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* Copyright (c) 1993 Paul Kranenburg
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Paul Kranenburg.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LINK_H_
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#define _LINK_H_
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#ifdef __ELF__
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#include <link_elf.h>
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#endif
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/*
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* A `Shared Object Descriptor' describes a shared object that is needed
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* to complete the link edit process of the object containing it.
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* A list of such objects (chained through `sod_next') is pointed at
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* by `sdt_sods' in the section_dispatch_table structure.
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*/
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struct sod { /* Shared Object Descriptor */
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long sod_name; /* name (relative to load address) */
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unsigned int sod_library : 1,/* Searched for by library rules */
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sod_reserved : 31;
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short sod_major; /* major version number */
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short sod_minor; /* minor version number */
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long sod_next; /* next sod */
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};
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/*
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* `Shared Object Map's are used by the run-time link editor (ld.so) to
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* keep track of all shared objects loaded into a process' address space.
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* These structures are only used at run-time and do not occur within
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* the text or data segment of an executable or shared library.
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*/
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struct so_map { /* Shared Object Map */
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caddr_t som_addr; /* Address at which object mapped */
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char *som_path; /* Path to mmap'ed file */
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struct so_map *som_next; /* Next map in chain */
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struct sod *som_sod; /* Sod responsible for this map */
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caddr_t som_sodbase; /* Base address of this sod */
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unsigned int som_write : 1; /* Text is currently writable */
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struct _dynamic *som_dynamic; /* _dynamic structure */
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caddr_t som_spd; /* Private data */
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};
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/*
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* Debug rendezvous struct. Pointer to this is set up in the
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* target code pointed by the DT_DEBUG tag. If it is
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* defined.
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*/
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struct r_debug {
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int r_version; /* Protocol version. */
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struct link_map *r_map; /* Head of list of loaded objects. */
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/*
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* This is the address of a function internal to the run-time linker,
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* that will always be called when the linker begins to map in a
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* library or unmap it, and again when the mapping change is complete.
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* The debugger can set a breakpoint at this address if it wants to
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* notice shared object mapping changes.
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*/
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unsigned long r_brk;
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enum {
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/*
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* This state value describes the mapping change taking place
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* when the `r_brk' address is called.
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*/
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RT_CONSISTENT, /* Mapping change is complete. */
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RT_ADD, /* Adding a new object. */
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RT_DELETE /* Removing an object mapping. */
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} r_state;
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unsigned long r_ldbase; /* Base address the linker is loaded at. */
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};
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/*
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* Maximum number of recognized shared object version numbers.
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*/
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#define MAXDEWEY 8
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/*
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* Header of the hints file.
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*/
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struct hints_header {
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long hh_magic;
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#define HH_MAGIC 011421044151
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long hh_version; /* Interface version number */
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#define LD_HINTS_VERSION_1 1
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#define LD_HINTS_VERSION_2 2
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long hh_hashtab; /* Location of hash table */
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long hh_nbucket; /* Number of buckets in hashtab */
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long hh_strtab; /* Location of strings */
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long hh_strtab_sz; /* Size of strings */
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long hh_ehints; /* End of hints (max offset in file) */
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long hh_dirlist; /* Colon-separated list of srch dirs */
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};
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#define HH_BADMAG(hdr) ((hdr).hh_magic != HH_MAGIC)
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/*
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* Hash table element in hints file.
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*/
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struct hints_bucket {
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/* namex and pathx are indices into the string table */
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int hi_namex; /* Library name */
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int hi_pathx; /* Full path */
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int hi_dewey[MAXDEWEY]; /* The versions */
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int hi_ndewey; /* Number of version numbers */
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#define hi_major hi_dewey[0]
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#define hi_minor hi_dewey[1]
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int hi_next; /* Next in this bucket */
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};
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#define _PATH_LD_HINTS "/var/run/ld.so.hints"
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#endif /* _LINK_H_ */
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