Merge from vendor branch BINUTILS:
[dragonfly.git] / libexec / rtld-elf / rtld.h
CommitLineData
984263bc
MD
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 $
984263bc
MD
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
55b88cae
DX
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
7fc47990
JS
60extern Elf_Addr _GLOBAL_OFFSET_TABLE_[];
61
984263bc
MD
62struct stat;
63struct Struct_Obj_Entry;
64
65/* Lists of shared objects */
66typedef struct Struct_Objlist_Entry {
67 STAILQ_ENTRY(Struct_Objlist_Entry) link;
68 struct Struct_Obj_Entry *obj;
69} Objlist_Entry;
70
71typedef STAILQ_HEAD(Struct_Objlist, Struct_Objlist_Entry) Objlist;
72
73/* Types of init and fini functions */
74typedef void (*InitFunc)(void);
75
76/* Lists of shared object dependencies */
77typedef struct Struct_Needed_Entry {
78 struct Struct_Needed_Entry *next;
79 struct Struct_Obj_Entry *obj;
80 unsigned long name; /* Offset of name in string table */
81} Needed_Entry;
82
83/* Lock object */
84typedef struct Struct_LockInfo {
85 void *context; /* Client context for creating locks */
86 void *thelock; /* The one big lock */
87 /* Debugging aids. */
88 volatile int rcount; /* Number of readers holding lock */
89 volatile int wcount; /* Number of writers holding lock */
90 /* Methods */
91 void *(*lock_create)(void *context);
92 void (*rlock_acquire)(void *lock);
93 void (*wlock_acquire)(void *lock);
94 void (*rlock_release)(void *lock);
95 void (*wlock_release)(void *lock);
96 void (*lock_destroy)(void *lock);
97 void (*context_destroy)(void *context);
98} LockInfo;
99
100/*
101 * Shared object descriptor.
102 *
103 * Items marked with "(%)" are dynamically allocated, and must be freed
104 * when the structure is destroyed.
105 *
106 * CAUTION: It appears that the JDK port peeks into these structures.
107 * It looks at "next" and "mapbase" at least. Don't add new members
108 * near the front, until this can be straightened out.
109 */
110typedef struct Struct_Obj_Entry {
111 /*
112 * These two items have to be set right for compatibility with the
113 * original ElfKit crt1.o.
114 */
115 Elf_Word magic; /* Magic number (sanity check) */
116 Elf_Word version; /* Version number of struct format */
117
118 struct Struct_Obj_Entry *next;
119 char *path; /* Pathname of underlying file (%) */
167f7029 120 char *origin_path; /* Directory path of origin file */
984263bc
MD
121 int refcount;
122 int dl_refcount; /* Number of times loaded by dlopen */
123
124 /* These items are computed by map_object() or by digest_phdr(). */
125 caddr_t mapbase; /* Base address of mapped region */
126 size_t mapsize; /* Size of mapped region in bytes */
127 size_t textsize; /* Size of text segment in bytes */
128 Elf_Addr vaddrbase; /* Base address in shared object file */
129 caddr_t relocbase; /* Relocation constant = mapbase - vaddrbase */
130 const Elf_Dyn *dynamic; /* Dynamic section */
131 caddr_t entry; /* Entry point */
132 const Elf_Phdr *phdr; /* Program header if it is mapped, else NULL */
133 size_t phsize; /* Size of program header in bytes */
134 const char *interp; /* Pathname of the interpreter, if any */
135
55b88cae
DX
136 /* TLS information */
137 int tlsindex; /* Index in DTV for this module */
138 void *tlsinit; /* Base address of TLS init block */
139 size_t tlsinitsize; /* Size of TLS init block for this module */
140 size_t tlssize; /* Size of TLS block for this module */
141 size_t tlsoffset; /* Offset of static TLS block for this module */
142 size_t tlsalign; /* Alignment of static TLS block */
143
984263bc
MD
144 /* Items from the dynamic section. */
145 Elf_Addr *pltgot; /* PLT or GOT, depending on architecture */
146 const Elf_Rel *rel; /* Relocation entries */
147 unsigned long relsize; /* Size in bytes of relocation info */
148 const Elf_Rela *rela; /* Relocation entries with addend */
149 unsigned long relasize; /* Size in bytes of addend relocation info */
150 const Elf_Rel *pltrel; /* PLT relocation entries */
151 unsigned long pltrelsize; /* Size in bytes of PLT relocation info */
152 const Elf_Rela *pltrela; /* PLT relocation entries with addend */
153 unsigned long pltrelasize; /* Size in bytes of PLT addend reloc info */
154 const Elf_Sym *symtab; /* Symbol table */
155 const char *strtab; /* String table */
156 unsigned long strsize; /* Size in bytes of string table */
157
158 const Elf_Addr *buckets; /* Hash table buckets array */
159 unsigned long nbuckets; /* Number of buckets */
160 const Elf_Addr *chains; /* Hash table chain array */
161 unsigned long nchains; /* Number of chains */
162
163 const char *rpath; /* Search path specified in object */
164 Needed_Entry *needed; /* Shared objects needed by this one (%) */
165
166 InitFunc init; /* Initialization function to call */
167 InitFunc fini; /* Termination function to call */
168
169 bool mainprog; /* True if this is the main program */
170 bool rtld; /* True if this is the dynamic linker */
171 bool textrel; /* True if there are relocations to text seg */
172 bool symbolic; /* True if generated with "-Bsymbolic" */
167f7029 173 bool bind_now; /* True if all relocations should be made first */
984263bc
MD
174 bool traced; /* Already printed in ldd trace output */
175 bool jmpslots_done; /* Already have relocated the jump slots */
176 bool init_done; /* Already have added object to init list */
55b88cae 177 bool tls_done; /* Already allocated offset for static TLS */
984263bc
MD
178
179 struct link_map linkmap; /* for GDB and dlinfo() */
180 Objlist dldags; /* Object belongs to these dlopened DAGs (%) */
181 Objlist dagmembers; /* DAG has these members (%) */
182 dev_t dev; /* Object's filesystem's device */
183 ino_t ino; /* Object's inode number */
184} Obj_Entry;
185
186#define RTLD_MAGIC 0xd550b87a
187#define RTLD_VERSION 1
188
189/*
190 * Symbol cache entry used during relocation to avoid multiple lookups
191 * of the same symbol.
192 */
193typedef struct Struct_SymCache {
194 const Elf_Sym *sym; /* Symbol table entry */
195 const Obj_Entry *obj; /* Shared object which defines it */
196} SymCache;
197
7fc47990
JS
198void _rtld_error(const char *, ...) __printflike(1, 2);
199Obj_Entry *map_object(int, const char *, const struct stat *);
200void *xcalloc(size_t);
201void *xmalloc(size_t);
202void *xrealloc(void *, size_t);
203char *xstrdup(const char *);
984263bc 204
7fc47990
JS
205void dump_relocations(Obj_Entry *);
206void dump_obj_relocations(Obj_Entry *);
207void dump_Elf_Rel(Obj_Entry *, const Elf_Rel *, u_long);
208void dump_Elf_Rela(Obj_Entry *, const Elf_Rela *, u_long);
4a8d9350 209
984263bc
MD
210/*
211 * Function declarations.
212 */
7fc47990
JS
213const char *basename(const char *);
214int do_copy_relocations(Obj_Entry *);
215unsigned long elf_hash(const char *);
216const Elf_Sym *find_symdef(unsigned long, const Obj_Entry *,
217 const Obj_Entry **, bool, SymCache *);
218void init_pltgot(Obj_Entry *);
219void lockdflt_init(LockInfo *);
220void obj_free(Obj_Entry *);
221Obj_Entry *obj_new(void);
222int reloc_non_plt(Obj_Entry *, Obj_Entry *);
223int reloc_plt(Obj_Entry *);
224int reloc_jmpslots(Obj_Entry *);
225void _rtld_bind_start(void);
226const Elf_Sym *symlook_obj(const char *, unsigned long, const Obj_Entry *,
227 bool);
228
229void *tls_get_addr_common(void **, int, size_t);
a1eee96a 230struct tls_tcb *allocate_tls(Obj_Entry *);
7fc47990
JS
231void free_tls(struct tls_tcb *);
232void *allocate_module_tls(int);
233bool allocate_tls_offset(Obj_Entry *);
234void free_tls_offset(Obj_Entry *);
235void allocate_initial_tls(Obj_Entry *);
984263bc 236#endif /* } */