From d6583bb2a13f329cf0332ef2570eb8bb8fc0e39c Mon Sep 17 00:00:00 2001 From: Theo de Raadt Date: Wed, 18 Oct 1995 08:53:40 +0000 Subject: initial import of NetBSD tree --- include/link.h | 283 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 283 insertions(+) create mode 100644 include/link.h (limited to 'include/link.h') diff --git a/include/link.h b/include/link.h new file mode 100644 index 00000000000..b5f256a8019 --- /dev/null +++ b/include/link.h @@ -0,0 +1,283 @@ +/* $NetBSD: link.h,v 1.9 1995/09/23 22:26:15 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 withough 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 _LINK_H_ +#define _LINK_H_ + +/* + * A `Shared Object Descriptor' descibes 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 +}; + +#define N_AUX(p) ((p)->n_other & 0xf) +#define N_BIND(p) (((unsigned int)(p)->n_other >> 4) & 0xf) +#define N_OTHER(r, v) (((unsigned int)(r) << 4) | ((v) & 0xf)) + +#define AUX_OBJECT 1 +#define AUX_FUNC 2 +/*#define BIND_LOCAL 0 not used */ +/*#define BIND_GLOBAL 1 not used */ +#define BIND_WEAK 2 + + +/* + * 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 */ +}; + +/* + * Entry points into ld.so - user interface to the run-time linker. + */ +struct ld_entry { + void *(*dlopen) __P((char *, int)); + int (*dlclose) __P((void *)); + void *(*dlsym) __P((void *, char *)); + int (*dlctl) __P((void *, int, void *)); + void (*dlexit) __P((void)); + void (*dlrsrvd[3]) __P((void)); +}; + +/* + * 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; /* compat - now in crt_ldso */ +}; + +#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 decriptor (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) */ +}; + +/* + * 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 + + +/* + * 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 + 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) */ +}; + +#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_ */ + -- cgit v1.2.3