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Diffstat (limited to 'include/link.h')
| -rw-r--r-- | include/link.h | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/include/link.h b/include/link.h new file mode 100644 index 0000000..cee7157 --- /dev/null +++ b/include/link.h @@ -0,0 +1,149 @@ +/* $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_ */ + |