Annotation of src/libexec/ld.aout_so/link.h, Revision 1.15
1.15 ! matt 1: /* $NetBSD: link.h,v 1.14 1998/09/05 13:08:41 pk Exp $ */
1.5 cgd 2:
1.14 pk 3: /*-
4: * Copyright (c) 1998 The NetBSD Foundation, Inc.
1.3 pk 5: * All rights reserved.
6: *
1.14 pk 7: * This code is derived from software contributed to The NetBSD Foundation
8: * by Paul Kranenburg.
9: *
1.3 pk 10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
1.14 pk 20: * This product includes software developed by the NetBSD
21: * Foundation, Inc. and its contributors.
22: * 4. Neither the name of The NetBSD Foundation nor the names of its
23: * contributors may be used to endorse or promote products derived
24: * from this software without specific prior written permission.
1.3 pk 25: *
1.14 pk 26: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36: * POSSIBILITY OF SUCH DAMAGE.
1.3 pk 37: */
38:
39: /*
1.1 pk 40: * RRS section definitions.
41: *
1.3 pk 42: * The layout of some data structures defined in this header file is
43: * such that we can provide compatibility with the SunOS 4.x shared
44: * library scheme.
1.1 pk 45: */
46:
47: #ifndef _LINK_H_
48: #define _LINK_H_
1.13 thorpej 49:
50: #include <dlfcn.h> /* for Dl_info */
1.1 pk 51:
52: /*
1.3 pk 53: * A `Shared Object Descriptor' descibes a shared object that is needed
1.1 pk 54: * to complete the link edit process of the object containing it.
1.3 pk 55: * A list of such objects (chained through `sod_next') is pointed at
56: * by `sdt_sods' in the section_dispatch_table structure.
1.1 pk 57: */
58:
1.3 pk 59: struct sod { /* Shared Object Descriptor */
60: long sod_name; /* name (relative to load address) */
61: u_int sod_library : 1, /* Searched for by library rules */
62: sod_reserved : 31;
63: short sod_major; /* major version number */
64: short sod_minor; /* minor version number */
65: long sod_next; /* next sod */
1.1 pk 66: };
67:
68: /*
1.3 pk 69: * `Shared Object Map's are used by the run-time link editor (ld.so) to
70: * keep track of all shared objects loaded into a process' address space.
1.1 pk 71: * These structures are only used at run-time and do not occur within
72: * the text or data segment of an executable or shared library.
73: */
1.3 pk 74: struct so_map { /* Shared Object Map */
75: caddr_t som_addr; /* Address at which object mapped */
76: char *som_path; /* Path to mmap'ed file */
77: struct so_map *som_next; /* Next map in chain */
78: struct sod *som_sod; /* Sod responsible for this map */
79: caddr_t som_sodbase; /* Base address of this sod */
80: u_int som_write : 1; /* Text is currently writable */
81: struct _dynamic *som_dynamic; /* _dynamic structure */
82: caddr_t som_spd; /* Private data */
1.1 pk 83: };
84:
85: /*
86: * Symbol description with size. This is simply an `nlist' with
87: * one field (nz_size) added.
88: * Used to convey size information on items in the data segment
89: * of shared objects. An array of these live in the shared object's
1.3 pk 90: * text segment and is addressed by the `sdt_nzlist' field.
1.1 pk 91: */
92: struct nzlist {
93: struct nlist nlist;
94: u_long nz_size;
95: #define nz_un nlist.n_un
96: #define nz_strx nlist.n_un.n_strx
97: #define nz_name nlist.n_un.n_name
98: #define nz_type nlist.n_type
99: #define nz_value nlist.n_value
100: #define nz_desc nlist.n_desc
101: #define nz_other nlist.n_other
102: };
103:
1.3 pk 104: #define N_AUX(p) ((p)->n_other & 0xf)
1.6 pk 105: #define N_BIND(p) (((unsigned int)(p)->n_other >> 4) & 0xf)
1.3 pk 106: #define N_OTHER(r, v) (((unsigned int)(r) << 4) | ((v) & 0xf))
107:
108: #define AUX_OBJECT 1
109: #define AUX_FUNC 2
1.15 ! matt 110: #define AUX_LABEL 3
1.6 pk 111: /*#define BIND_LOCAL 0 not used */
112: /*#define BIND_GLOBAL 1 not used */
113: #define BIND_WEAK 2
1.3 pk 114:
115:
1.1 pk 116: /*
1.3 pk 117: * The `section_dispatch_table' structure contains offsets to various data
1.1 pk 118: * structures needed to do run-time relocation.
119: */
1.3 pk 120: struct section_dispatch_table {
121: struct so_map *sdt_loaded; /* List of loaded objects */
122: long sdt_sods; /* List of shared objects descriptors */
1.7 pk 123: long sdt_paths; /* Library search paths */
1.3 pk 124: long sdt_got; /* Global offset table */
125: long sdt_plt; /* Procedure linkage table */
126: long sdt_rel; /* Relocation table */
127: long sdt_hash; /* Symbol hash table */
128: long sdt_nzlist; /* Symbol table itself */
129: long sdt_filler2; /* Unused (was: stab_hash) */
130: long sdt_buckets; /* Number of hash buckets */
131: long sdt_strings; /* Symbol strings */
132: long sdt_str_sz; /* Size of symbol strings */
133: long sdt_text_sz; /* Size of text area */
134: long sdt_plt_sz; /* Size of procedure linkage table */
1.1 pk 135: };
136:
137: /*
1.3 pk 138: * RRS symbol hash table, addressed by `sdt_hash' in section_dispatch_table.
1.1 pk 139: * Used to quickly lookup symbols of the shared object by hashing
140: * on the symbol's name. `rh_symbolnum' is the index of the symbol
1.3 pk 141: * in the shared object's symbol list (`sdt_nzlist'), `rh_next' is
1.1 pk 142: * the next symbol in the hash bucket (in case of collisions).
143: */
144: struct rrs_hash {
1.3 pk 145: int rh_symbolnum; /* Symbol number */
146: int rh_next; /* Next hash entry */
1.1 pk 147: };
148:
149: /*
150: * `rt_symbols' is used to keep track of run-time allocated commons
151: * and data items copied from shared objects.
152: */
153: struct rt_symbol {
1.3 pk 154: struct nzlist *rt_sp; /* The symbol */
155: struct rt_symbol *rt_next; /* Next in linear list */
156: struct rt_symbol *rt_link; /* Next in bucket */
157: caddr_t rt_srcaddr; /* Address of "master" copy */
158: struct so_map *rt_smp; /* Originating map */
1.1 pk 159: };
160:
161: /*
162: * Debugger interface structure.
163: */
1.3 pk 164: struct so_debug {
165: int dd_version; /* Version # of interface */
166: int dd_in_debugger; /* Set when run by debugger */
167: int dd_sym_loaded; /* Run-time linking brought more
168: symbols into scope */
169: char *dd_bpt_addr; /* Address of rtld-generated bpt */
170: int dd_bpt_shadow; /* Original contents of bpt */
171: struct rt_symbol *dd_cc; /* Allocated commons/copied data */
1.1 pk 172: };
173:
174: /*
175: * Entry points into ld.so - user interface to the run-time linker.
176: */
177: struct ld_entry {
1.11 scottr 178: void *(*dlopen) __P((const char *, int));
1.3 pk 179: int (*dlclose) __P((void *));
1.11 scottr 180: void *(*dlsym) __P((void *, const char *));
1.3 pk 181: int (*dlctl) __P((void *, int, void *));
1.9 pk 182: void (*dlexit) __P((void));
1.12 pk 183: int (*dladdr) __P((void *, Dl_info *));
184: void (*dlrsrvd[2]) __P((void));
1.1 pk 185: };
1.3 pk 186:
187: /*
1.1 pk 188: * This is the structure pointed at by the __DYNAMIC symbol if an
189: * executable requires the attention of the run-time link editor.
190: * __DYNAMIC is given the value zero if no run-time linking needs to
191: * be done (it is always present in shared objects).
1.3 pk 192: * The union `d_un' provides for different versions of the dynamic
193: * linking mechanism (switched on by `d_version'). The last version
1.1 pk 194: * used by Sun is 3. We leave some room here and go to version number
195: * 8 for NetBSD, the main difference lying in the support for the
196: * `nz_list' type of symbols.
197: */
198:
1.3 pk 199: struct _dynamic {
200: int d_version; /* version # of this interface */
201: struct so_debug *d_debug;
1.1 pk 202: union {
1.3 pk 203: struct section_dispatch_table *d_sdt;
204: } d_un;
1.9 pk 205: struct ld_entry *d_entry; /* compat - now in crt_ldso */
1.1 pk 206: };
207:
208: #define LD_VERSION_SUN (3)
209: #define LD_VERSION_BSD (8)
210: #define LD_VERSION_NZLIST_P(v) ((v) >= 8)
211:
1.3 pk 212: #define LD_GOT(x) ((x)->d_un.d_sdt->sdt_got)
213: #define LD_PLT(x) ((x)->d_un.d_sdt->sdt_plt)
214: #define LD_REL(x) ((x)->d_un.d_sdt->sdt_rel)
215: #define LD_SYMBOL(x) ((x)->d_un.d_sdt->sdt_nzlist)
216: #define LD_HASH(x) ((x)->d_un.d_sdt->sdt_hash)
217: #define LD_STRINGS(x) ((x)->d_un.d_sdt->sdt_strings)
218: #define LD_NEED(x) ((x)->d_un.d_sdt->sdt_sods)
219: #define LD_BUCKETS(x) ((x)->d_un.d_sdt->sdt_buckets)
1.7 pk 220: #define LD_PATHS(x) ((x)->d_un.d_sdt->sdt_paths)
1.3 pk 221:
222: #define LD_GOTSZ(x) ((x)->d_un.d_sdt->sdt_plt - (x)->d_un.d_sdt->sdt_got)
223: #define LD_RELSZ(x) ((x)->d_un.d_sdt->sdt_hash - (x)->d_un.d_sdt->sdt_rel)
224: #define LD_HASHSZ(x) ((x)->d_un.d_sdt->sdt_nzlist - (x)->d_un.d_sdt->sdt_hash)
225: #define LD_STABSZ(x) ((x)->d_un.d_sdt->sdt_strings - (x)->d_un.d_sdt->sdt_nzlist)
226: #define LD_PLTSZ(x) ((x)->d_un.d_sdt->sdt_plt_sz)
227: #define LD_STRSZ(x) ((x)->d_un.d_sdt->sdt_str_sz)
228: #define LD_TEXTSZ(x) ((x)->d_un.d_sdt->sdt_text_sz)
1.1 pk 229:
230: /*
1.3 pk 231: * Interface to ld.so
1.1 pk 232: */
233: struct crt_ldso {
234: int crt_ba; /* Base address of ld.so */
235: int crt_dzfd; /* "/dev/zero" file decriptor (SunOS) */
236: int crt_ldfd; /* ld.so file descriptor */
1.3 pk 237: struct _dynamic *crt_dp; /* Main's __DYNAMIC */
1.1 pk 238: char **crt_ep; /* environment strings */
239: caddr_t crt_bp; /* Breakpoint if run from debugger */
1.6 pk 240: char *crt_prog; /* Program name (v3) */
241: char *crt_ldso; /* Link editor name (v4) */
242: struct ld_entry *crt_ldentry; /* dl*() access (v4) */
1.1 pk 243: };
244:
245: /*
246: * Version passed from crt0 to ld.so (1st argument to _rtld()).
247: */
248: #define CRT_VERSION_SUN 1
1.3 pk 249: #define CRT_VERSION_BSD_2 2
250: #define CRT_VERSION_BSD_3 3
1.6 pk 251: #define CRT_VERSION_BSD_4 4
1.2 pk 252:
253:
254: /*
255: * Maximum number of recognized shared object version numbers.
256: */
257: #define MAXDEWEY 8
258:
259: /*
260: * Header of the hints file.
261: */
262: struct hints_header {
263: long hh_magic;
264: #define HH_MAGIC 011421044151
265: long hh_version; /* Interface version number */
266: #define LD_HINTS_VERSION_1 1
1.10 pk 267: #define LD_HINTS_VERSION_2 2
1.2 pk 268: long hh_hashtab; /* Location of hash table */
269: long hh_nbucket; /* Number of buckets in hashtab */
270: long hh_strtab; /* Location of strings */
271: long hh_strtab_sz; /* Size of strings */
272: long hh_ehints; /* End of hints (max offset in file) */
1.10 pk 273: long hh_dirlist; /* Colon-separated list of srch dirs */
1.2 pk 274: };
275:
276: #define HH_BADMAG(hdr) ((hdr).hh_magic != HH_MAGIC)
277:
278: /*
279: * Hash table element in hints file.
280: */
281: struct hints_bucket {
282: /* namex and pathx are indices into the string table */
283: int hi_namex; /* Library name */
284: int hi_pathx; /* Full path */
285: int hi_dewey[MAXDEWEY]; /* The versions */
286: int hi_ndewey; /* Number of version numbers */
287: #define hi_major hi_dewey[0]
288: #define hi_minor hi_dewey[1]
289: int hi_next; /* Next in this bucket */
290: };
291:
292: #define _PATH_LD_HINTS "/var/run/ld.so.hints"
1.1 pk 293:
294: #endif /* _LINK_H_ */
295:
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