<sys/link_elf.h>: Fix include guard.
[dragonfly.git] / libexec / rtld-elf / rtld.h
CommitLineData
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1/*-
2 * Copyright 1996, 1997, 1998, 1999, 2000 John D. Polstra.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 * $FreeBSD: src/libexec/rtld-elf/rtld.h,v 1.15.2.6 2003/02/20 20:42:46 kan Exp $
a1eee96a 26 * $DragonFly: src/libexec/rtld-elf/rtld.h,v 1.11 2005/05/11 19:47:06 dillon Exp $
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27 */
28
29#ifndef RTLD_H /* { */
30#define RTLD_H 1
31
32#include <machine/elf.h>
33#include <sys/types.h>
34#include <sys/queue.h>
35
36#include <elf-hints.h>
37#include <link.h>
38#include <stddef.h>
39
40#include "rtld_machdep.h"
41
42#ifndef STANDARD_LIBRARY_PATH
43#define STANDARD_LIBRARY_PATH "/usr/lib"
44#endif
45
46#define NEW(type) ((type *) xmalloc(sizeof(type)))
47#define CNEW(type) ((type *) xcalloc(sizeof(type)))
48
49/* We might as well do booleans like C++. */
50typedef unsigned char bool;
51#define false 0
52#define true 1
53
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54extern size_t tls_last_offset;
55extern size_t tls_last_size;
56extern size_t tls_static_space;
57extern int tls_dtv_generation;
58extern int tls_max_index;
59
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60struct stat;
61struct Struct_Obj_Entry;
62
63/* Lists of shared objects */
64typedef struct Struct_Objlist_Entry {
65 STAILQ_ENTRY(Struct_Objlist_Entry) link;
66 struct Struct_Obj_Entry *obj;
67} Objlist_Entry;
68
69typedef STAILQ_HEAD(Struct_Objlist, Struct_Objlist_Entry) Objlist;
70
71/* Types of init and fini functions */
72typedef void (*InitFunc)(void);
73
74/* Lists of shared object dependencies */
75typedef struct Struct_Needed_Entry {
76 struct Struct_Needed_Entry *next;
77 struct Struct_Obj_Entry *obj;
78 unsigned long name; /* Offset of name in string table */
79} Needed_Entry;
80
81/* Lock object */
82typedef struct Struct_LockInfo {
83 void *context; /* Client context for creating locks */
84 void *thelock; /* The one big lock */
85 /* Debugging aids. */
86 volatile int rcount; /* Number of readers holding lock */
87 volatile int wcount; /* Number of writers holding lock */
88 /* Methods */
89 void *(*lock_create)(void *context);
90 void (*rlock_acquire)(void *lock);
91 void (*wlock_acquire)(void *lock);
92 void (*rlock_release)(void *lock);
93 void (*wlock_release)(void *lock);
94 void (*lock_destroy)(void *lock);
95 void (*context_destroy)(void *context);
96} LockInfo;
97
98/*
99 * Shared object descriptor.
100 *
101 * Items marked with "(%)" are dynamically allocated, and must be freed
102 * when the structure is destroyed.
103 *
104 * CAUTION: It appears that the JDK port peeks into these structures.
105 * It looks at "next" and "mapbase" at least. Don't add new members
106 * near the front, until this can be straightened out.
107 */
108typedef struct Struct_Obj_Entry {
109 /*
110 * These two items have to be set right for compatibility with the
111 * original ElfKit crt1.o.
112 */
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113 Elf_Size magic; /* Magic number (sanity check) */
114 Elf_Size version; /* Version number of struct format */
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115
116 struct Struct_Obj_Entry *next;
117 char *path; /* Pathname of underlying file (%) */
167f7029 118 char *origin_path; /* Directory path of origin file */
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119 int refcount;
120 int dl_refcount; /* Number of times loaded by dlopen */
121
122 /* These items are computed by map_object() or by digest_phdr(). */
123 caddr_t mapbase; /* Base address of mapped region */
124 size_t mapsize; /* Size of mapped region in bytes */
125 size_t textsize; /* Size of text segment in bytes */
126 Elf_Addr vaddrbase; /* Base address in shared object file */
127 caddr_t relocbase; /* Relocation constant = mapbase - vaddrbase */
128 const Elf_Dyn *dynamic; /* Dynamic section */
129 caddr_t entry; /* Entry point */
130 const Elf_Phdr *phdr; /* Program header if it is mapped, else NULL */
131 size_t phsize; /* Size of program header in bytes */
132 const char *interp; /* Pathname of the interpreter, if any */
133
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134 /* TLS information */
135 int tlsindex; /* Index in DTV for this module */
136 void *tlsinit; /* Base address of TLS init block */
137 size_t tlsinitsize; /* Size of TLS init block for this module */
138 size_t tlssize; /* Size of TLS block for this module */
139 size_t tlsoffset; /* Offset of static TLS block for this module */
140 size_t tlsalign; /* Alignment of static TLS block */
141
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142 /* Items from the dynamic section. */
143 Elf_Addr *pltgot; /* PLT or GOT, depending on architecture */
144 const Elf_Rel *rel; /* Relocation entries */
145 unsigned long relsize; /* Size in bytes of relocation info */
146 const Elf_Rela *rela; /* Relocation entries with addend */
147 unsigned long relasize; /* Size in bytes of addend relocation info */
148 const Elf_Rel *pltrel; /* PLT relocation entries */
149 unsigned long pltrelsize; /* Size in bytes of PLT relocation info */
150 const Elf_Rela *pltrela; /* PLT relocation entries with addend */
151 unsigned long pltrelasize; /* Size in bytes of PLT addend reloc info */
152 const Elf_Sym *symtab; /* Symbol table */
153 const char *strtab; /* String table */
154 unsigned long strsize; /* Size in bytes of string table */
155
d697cc44 156 const Elf_Hashelt *buckets; /* Hash table buckets array */
984263bc 157 unsigned long nbuckets; /* Number of buckets */
d697cc44 158 const Elf_Hashelt *chains; /* Hash table chain array */
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159 unsigned long nchains; /* Number of chains */
160
161 const char *rpath; /* Search path specified in object */
162 Needed_Entry *needed; /* Shared objects needed by this one (%) */
163
164 InitFunc init; /* Initialization function to call */
165 InitFunc fini; /* Termination function to call */
166
167 bool mainprog; /* True if this is the main program */
168 bool rtld; /* True if this is the dynamic linker */
169 bool textrel; /* True if there are relocations to text seg */
170 bool symbolic; /* True if generated with "-Bsymbolic" */
167f7029 171 bool bind_now; /* True if all relocations should be made first */
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172 bool traced; /* Already printed in ldd trace output */
173 bool jmpslots_done; /* Already have relocated the jump slots */
174 bool init_done; /* Already have added object to init list */
55b88cae 175 bool tls_done; /* Already allocated offset for static TLS */
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176
177 struct link_map linkmap; /* for GDB and dlinfo() */
178 Objlist dldags; /* Object belongs to these dlopened DAGs (%) */
179 Objlist dagmembers; /* DAG has these members (%) */
180 dev_t dev; /* Object's filesystem's device */
181 ino_t ino; /* Object's inode number */
d697cc44 182 void *priv; /* Platform-dependant */
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183} Obj_Entry;
184
185#define RTLD_MAGIC 0xd550b87a
186#define RTLD_VERSION 1
187
188/*
189 * Symbol cache entry used during relocation to avoid multiple lookups
190 * of the same symbol.
191 */
192typedef struct Struct_SymCache {
193 const Elf_Sym *sym; /* Symbol table entry */
194 const Obj_Entry *obj; /* Shared object which defines it */
195} SymCache;
196
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197void _rtld_error(const char *, ...) __printflike(1, 2);
198Obj_Entry *map_object(int, const char *, const struct stat *);
199void *xcalloc(size_t);
200void *xmalloc(size_t);
201void *xrealloc(void *, size_t);
202char *xstrdup(const char *);
984263bc 203
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204void dump_relocations(Obj_Entry *);
205void dump_obj_relocations(Obj_Entry *);
206void dump_Elf_Rel(Obj_Entry *, const Elf_Rel *, u_long);
207void dump_Elf_Rela(Obj_Entry *, const Elf_Rela *, u_long);
4a8d9350 208
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209extern Elf_Addr _GLOBAL_OFFSET_TABLE_[];
210
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211/*
212 * Function declarations.
213 */
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214const char *basename(const char *);
215int do_copy_relocations(Obj_Entry *);
216unsigned long elf_hash(const char *);
217const Elf_Sym *find_symdef(unsigned long, const Obj_Entry *,
218 const Obj_Entry **, bool, SymCache *);
219void init_pltgot(Obj_Entry *);
220void lockdflt_init(LockInfo *);
221void obj_free(Obj_Entry *);
222Obj_Entry *obj_new(void);
223int reloc_non_plt(Obj_Entry *, Obj_Entry *);
224int reloc_plt(Obj_Entry *);
225int reloc_jmpslots(Obj_Entry *);
226void _rtld_bind_start(void);
227const Elf_Sym *symlook_obj(const char *, unsigned long, const Obj_Entry *,
228 bool);
229
230void *tls_get_addr_common(void **, int, size_t);
a1eee96a 231struct tls_tcb *allocate_tls(Obj_Entry *);
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232void free_tls(struct tls_tcb *);
233void *allocate_module_tls(int);
234bool allocate_tls_offset(Obj_Entry *);
235void free_tls_offset(Obj_Entry *);
236void allocate_initial_tls(Obj_Entry *);
984263bc 237#endif /* } */