299 lines
10 KiB
C
299 lines
10 KiB
C
/* $NetBSD: link.h,v 1.6 1994/12/23 20:16:59 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 withough 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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/*
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* RRS section definitions.
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*
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* The layout of some data structures defined in this header file is
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* such that we can provide compatibility with the SunOS 4.x shared
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* library scheme.
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*/
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#ifndef _LINK_H_
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#define _LINK_H_
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/*
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* A `Shared Object Descriptor' descibes 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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u_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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u_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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* Symbol description with size. This is simply an `nlist' with
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* one field (nz_size) added.
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* Used to convey size information on items in the data segment
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* of shared objects. An array of these live in the shared object's
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* text segment and is addressed by the `sdt_nzlist' field.
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*/
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struct nzlist {
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struct nlist nlist;
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u_long nz_size;
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#define nz_un nlist.n_un
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#define nz_strx nlist.n_un.n_strx
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#define nz_name nlist.n_un.n_name
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#define nz_type nlist.n_type
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#define nz_value nlist.n_value
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#define nz_desc nlist.n_desc
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#define nz_other nlist.n_other
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};
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#define N_AUX(p) ((p)->n_other & 0xf)
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#define N_BIND(p) (((unsigned int)(p)->n_other >> 4) & 0xf)
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#define N_OTHER(r, v) (((unsigned int)(r) << 4) | ((v) & 0xf))
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#define AUX_OBJECT 1
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#define AUX_FUNC 2
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/*#define BIND_LOCAL 0 not used */
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/*#define BIND_GLOBAL 1 not used */
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#define BIND_WEAK 2
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/*
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* The `section_dispatch_table' structure contains offsets to various data
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* structures needed to do run-time relocation.
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*/
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struct section_dispatch_table {
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struct so_map *sdt_loaded; /* List of loaded objects */
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long sdt_sods; /* List of shared objects descriptors */
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long sdt_filler1; /* Unused (was: search rules) */
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long sdt_got; /* Global offset table */
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long sdt_plt; /* Procedure linkage table */
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long sdt_rel; /* Relocation table */
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long sdt_hash; /* Symbol hash table */
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long sdt_nzlist; /* Symbol table itself */
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long sdt_filler2; /* Unused (was: stab_hash) */
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long sdt_buckets; /* Number of hash buckets */
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long sdt_strings; /* Symbol strings */
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long sdt_str_sz; /* Size of symbol strings */
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long sdt_text_sz; /* Size of text area */
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long sdt_plt_sz; /* Size of procedure linkage table */
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};
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/*
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* RRS symbol hash table, addressed by `sdt_hash' in section_dispatch_table.
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* Used to quickly lookup symbols of the shared object by hashing
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* on the symbol's name. `rh_symbolnum' is the index of the symbol
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* in the shared object's symbol list (`sdt_nzlist'), `rh_next' is
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* the next symbol in the hash bucket (in case of collisions).
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*/
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struct rrs_hash {
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int rh_symbolnum; /* Symbol number */
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int rh_next; /* Next hash entry */
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};
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/*
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* `rt_symbols' is used to keep track of run-time allocated commons
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* and data items copied from shared objects.
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*/
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struct rt_symbol {
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struct nzlist *rt_sp; /* The symbol */
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struct rt_symbol *rt_next; /* Next in linear list */
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struct rt_symbol *rt_link; /* Next in bucket */
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caddr_t rt_srcaddr; /* Address of "master" copy */
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struct so_map *rt_smp; /* Originating map */
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};
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/*
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* Debugger interface structure.
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*/
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struct so_debug {
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int dd_version; /* Version # of interface */
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int dd_in_debugger; /* Set when run by debugger */
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int dd_sym_loaded; /* Run-time linking brought more
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symbols into scope */
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char *dd_bpt_addr; /* Address of rtld-generated bpt */
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int dd_bpt_shadow; /* Original contents of bpt */
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struct rt_symbol *dd_cc; /* Allocated commons/copied data */
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};
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/*
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* Entry points into ld.so - user interface to the run-time linker.
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*/
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struct ld_entry {
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void *(*dlopen) __P((char *, int));
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int (*dlclose) __P((void *));
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void *(*dlsym) __P((void *, char *));
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int (*dlctl) __P((void *, int, void *));
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};
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/*
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* dlctl() commands
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*/
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#define DL_GETERRNO 1
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#define DL_SETSRCHPATH x
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#define DL_GETLIST x
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#define DL_GETREFCNT x
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#define DL_GETLOADADDR x
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/*
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* dl*() prototypes.
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*/
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extern void *dlopen __P((char *, int));
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extern int dlclose __P((void *));
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extern void *dlsym __P((void *, char *));
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extern int dlctl __P((void *, int, void *));
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/*
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* This is the structure pointed at by the __DYNAMIC symbol if an
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* executable requires the attention of the run-time link editor.
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* __DYNAMIC is given the value zero if no run-time linking needs to
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* be done (it is always present in shared objects).
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* The union `d_un' provides for different versions of the dynamic
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* linking mechanism (switched on by `d_version'). The last version
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* used by Sun is 3. We leave some room here and go to version number
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* 8 for NetBSD, the main difference lying in the support for the
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* `nz_list' type of symbols.
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*/
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struct _dynamic {
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int d_version; /* version # of this interface */
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struct so_debug *d_debug;
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union {
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struct section_dispatch_table *d_sdt;
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} d_un;
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struct ld_entry *d_entry; /* XXX */
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};
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#define LD_VERSION_SUN (3)
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#define LD_VERSION_BSD (8)
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#define LD_VERSION_NZLIST_P(v) ((v) >= 8)
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#define LD_GOT(x) ((x)->d_un.d_sdt->sdt_got)
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#define LD_PLT(x) ((x)->d_un.d_sdt->sdt_plt)
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#define LD_REL(x) ((x)->d_un.d_sdt->sdt_rel)
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#define LD_SYMBOL(x) ((x)->d_un.d_sdt->sdt_nzlist)
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#define LD_HASH(x) ((x)->d_un.d_sdt->sdt_hash)
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#define LD_STRINGS(x) ((x)->d_un.d_sdt->sdt_strings)
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#define LD_NEED(x) ((x)->d_un.d_sdt->sdt_sods)
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#define LD_BUCKETS(x) ((x)->d_un.d_sdt->sdt_buckets)
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#define LD_GOTSZ(x) ((x)->d_un.d_sdt->sdt_plt - (x)->d_un.d_sdt->sdt_got)
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#define LD_RELSZ(x) ((x)->d_un.d_sdt->sdt_hash - (x)->d_un.d_sdt->sdt_rel)
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#define LD_HASHSZ(x) ((x)->d_un.d_sdt->sdt_nzlist - (x)->d_un.d_sdt->sdt_hash)
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#define LD_STABSZ(x) ((x)->d_un.d_sdt->sdt_strings - (x)->d_un.d_sdt->sdt_nzlist)
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#define LD_PLTSZ(x) ((x)->d_un.d_sdt->sdt_plt_sz)
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#define LD_STRSZ(x) ((x)->d_un.d_sdt->sdt_str_sz)
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#define LD_TEXTSZ(x) ((x)->d_un.d_sdt->sdt_text_sz)
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/*
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* Interface to ld.so
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*/
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struct crt_ldso {
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int crt_ba; /* Base address of ld.so */
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int crt_dzfd; /* "/dev/zero" file decriptor (SunOS) */
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int crt_ldfd; /* ld.so file descriptor */
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struct _dynamic *crt_dp; /* Main's __DYNAMIC */
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char **crt_ep; /* environment strings */
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caddr_t crt_bp; /* Breakpoint if run from debugger */
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char *crt_prog; /* Program name (v3) */
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char *crt_ldso; /* Link editor name (v4) */
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struct ld_entry *crt_ldentry; /* dl*() access (v4) */
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};
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/*
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* Version passed from crt0 to ld.so (1st argument to _rtld()).
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*/
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#define CRT_VERSION_SUN 1
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#define CRT_VERSION_BSD_2 2
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#define CRT_VERSION_BSD_3 3
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#define CRT_VERSION_BSD_4 4
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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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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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};
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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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