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