/*- * SPDX-License-Identifier: BSD-4-Clause * * 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. */ /* * RRS section definitions. * * The layout of some data structures defined in this header file is * such that we can provide compatibility with the SunOS 4.x shared * library scheme. */ #ifndef _SYS_LINK_AOUT_H_ #define _SYS_LINK_AOUT_H_ struct dl_info; /* * 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) */ u_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 */ u_int som_write : 1; /* Text is currently writable */ struct _dynamic *som_dynamic; /* _dynamic structure */ caddr_t som_spd; /* Private data */ }; /* * Symbol description with size. This is simply an `nlist' with * one field (nz_size) added. * Used to convey size information on items in the data segment * of shared objects. An array of these live in the shared object's * text segment and is addressed by the `sdt_nzlist' field. */ struct nzlist { struct nlist nlist; u_long nz_size; }; #define nz_un nlist.n_un #define nz_strx nlist.n_un.n_strx #define nz_name nlist.n_un.n_name #define nz_type nlist.n_type #define nz_value nlist.n_value #define nz_desc nlist.n_desc #define nz_other nlist.n_other /* * The `section_dispatch_table' structure contains offsets to various data * structures needed to do run-time relocation. */ struct section_dispatch_table { struct so_map *sdt_loaded; /* List of loaded objects */ long sdt_sods; /* List of shared objects descriptors */ long sdt_paths; /* Library search paths */ long sdt_got; /* Global offset table */ long sdt_plt; /* Procedure linkage table */ long sdt_rel; /* Relocation table */ long sdt_hash; /* Symbol hash table */ long sdt_nzlist; /* Symbol table itself */ long sdt_filler2; /* Unused (was: stab_hash) */ long sdt_buckets; /* Number of hash buckets */ long sdt_strings; /* Symbol strings */ long sdt_str_sz; /* Size of symbol strings */ long sdt_text_sz; /* Size of text area */ long sdt_plt_sz; /* Size of procedure linkage table */ }; /* * RRS symbol hash table, addressed by `sdt_hash' in section_dispatch_table. * Used to quickly lookup symbols of the shared object by hashing * on the symbol's name. `rh_symbolnum' is the index of the symbol * in the shared object's symbol list (`sdt_nzlist'), `rh_next' is * the next symbol in the hash bucket (in case of collisions). */ struct rrs_hash { int rh_symbolnum; /* Symbol number */ int rh_next; /* Next hash entry */ }; /* * `rt_symbols' is used to keep track of run-time allocated commons * and data items copied from shared objects. */ struct rt_symbol { struct nzlist *rt_sp; /* The symbol */ struct rt_symbol *rt_next; /* Next in linear list */ struct rt_symbol *rt_link; /* Next in bucket */ caddr_t rt_srcaddr; /* Address of "master" copy */ struct so_map *rt_smp; /* Originating map */ }; /* * Debugger interface structure. */ struct so_debug { int dd_version; /* Version # of interface */ int dd_in_debugger; /* Set when run by debugger */ int dd_sym_loaded; /* Run-time linking brought more symbols into scope */ char *dd_bpt_addr; /* Address of rtld-generated bpt */ int dd_bpt_shadow; /* Original contents of bpt */ struct rt_symbol *dd_cc; /* Allocated commons/copied data */ }; /* * Version returned to crt0 from ld.so */ #define LDSO_VERSION_NONE 0 /* FreeBSD2.0, 2.0.5 */ #define LDSO_VERSION_HAS_DLEXIT 1 /* includes dlexit in ld_entry */ #define LDSO_VERSION_HAS_DLSYM3 2 /* includes 3-argument dlsym */ #define LDSO_VERSION_HAS_DLADDR 3 /* includes dladdr in ld_entry */ /* * Entry points into ld.so - user interface to the run-time linker. * Entries are valid for the given version numbers returned by ld.so * to crt0. */ struct ld_entry { void *(*dlopen)(const char *, int); /* NONE */ int (*dlclose)(void *); /* NONE */ void *(*dlsym)(void *, const char *); /* NONE */ const char *(*dlerror)(void); /* NONE */ void (*dlexit)(void); /* HAS_DLEXIT */ void *(*dlsym3)(void *, const char *, void *); /* HAS_DLSYM3 */ int (*dladdr)(const void *, struct dl_info *); /* HAS_DLADDR */ }; /* * This is the structure pointed at by the __DYNAMIC symbol if an * executable requires the attention of the run-time link editor. * __DYNAMIC is given the value zero if no run-time linking needs to * be done (it is always present in shared objects). * The union `d_un' provides for different versions of the dynamic * linking mechanism (switched on by `d_version'). The last version * used by Sun is 3. We leave some room here and go to version number * 8 for NetBSD, the main difference lying in the support for the * `nz_list' type of symbols. */ struct _dynamic { int d_version; /* version # of this interface */ struct so_debug *d_debug; union { struct section_dispatch_table *d_sdt; } d_un; struct ld_entry *d_entry; /* XXX */ }; #define LD_VERSION_SUN (3) #define LD_VERSION_BSD (8) #define LD_VERSION_NZLIST_P(v) ((v) >= 8) #define LD_GOT(x) ((x)->d_un.d_sdt->sdt_got) #define LD_PLT(x) ((x)->d_un.d_sdt->sdt_plt) #define LD_REL(x) ((x)->d_un.d_sdt->sdt_rel) #define LD_SYMBOL(x) ((x)->d_un.d_sdt->sdt_nzlist) #define LD_HASH(x) ((x)->d_un.d_sdt->sdt_hash) #define LD_STRINGS(x) ((x)->d_un.d_sdt->sdt_strings) #define LD_NEED(x) ((x)->d_un.d_sdt->sdt_sods) #define LD_BUCKETS(x) ((x)->d_un.d_sdt->sdt_buckets) #define LD_PATHS(x) ((x)->d_un.d_sdt->sdt_paths) #define LD_GOTSZ(x) ((x)->d_un.d_sdt->sdt_plt - (x)->d_un.d_sdt->sdt_got) #define LD_RELSZ(x) ((x)->d_un.d_sdt->sdt_hash - (x)->d_un.d_sdt->sdt_rel) #define LD_HASHSZ(x) ((x)->d_un.d_sdt->sdt_nzlist - (x)->d_un.d_sdt->sdt_hash) #define LD_STABSZ(x) ((x)->d_un.d_sdt->sdt_strings - (x)->d_un.d_sdt->sdt_nzlist) #define LD_PLTSZ(x) ((x)->d_un.d_sdt->sdt_plt_sz) #define LD_STRSZ(x) ((x)->d_un.d_sdt->sdt_str_sz) #define LD_TEXTSZ(x) ((x)->d_un.d_sdt->sdt_text_sz) /* * Interface to ld.so */ struct crt_ldso { int crt_ba; /* Base address of ld.so */ int crt_dzfd; /* "/dev/zero" file descriptor (SunOS) */ int crt_ldfd; /* ld.so file descriptor */ struct _dynamic *crt_dp; /* Main's __DYNAMIC */ char **crt_ep; /* environment strings */ caddr_t crt_bp; /* Breakpoint if run from debugger */ char *crt_prog; /* Program name (v3) */ char *crt_ldso; /* Link editor name (v4) */ struct ld_entry *crt_ldentry; /* dl*() access (v4) */ char **crt_argv; /* argument strings (v5) */ }; /* * Version passed from crt0 to ld.so (1st argument to _rtld()). */ #define CRT_VERSION_SUN 1 #define CRT_VERSION_BSD_2 2 #define CRT_VERSION_BSD_3 3 #define CRT_VERSION_BSD_4 4 #define CRT_VERSION_BSD_5 5 /* * 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 /* _SYS_LINK_AOUT_H_ */
