FreeBSD/Linux Kernel Cross Reference
sys/sys/linker.h
1 /*-
2 * Copyright (c) 1997-2000 Doug Rabson
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 AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29 #ifndef _SYS_LINKER_H_
30 #define _SYS_LINKER_H_
31
32 #ifdef _KERNEL
33
34 #include <machine/elf.h>
35 #include <sys/kobj.h>
36
37 #ifdef MALLOC_DECLARE
38 MALLOC_DECLARE(M_LINKER);
39 #endif
40
41 struct mod_depend;
42
43 /*
44 * Object representing a file which has been loaded by the linker.
45 */
46 typedef struct linker_file* linker_file_t;
47 typedef TAILQ_HEAD(, linker_file) linker_file_list_t;
48
49 typedef caddr_t linker_sym_t; /* opaque symbol */
50 typedef c_caddr_t c_linker_sym_t; /* const opaque symbol */
51 typedef int (*linker_function_name_callback_t)(const char *, void *);
52
53 /*
54 * expanded out linker_sym_t
55 */
56 typedef struct linker_symval {
57 const char* name;
58 caddr_t value;
59 size_t size;
60 } linker_symval_t;
61
62 typedef int (*linker_function_nameval_callback_t)(linker_file_t, int, linker_symval_t *, void *);
63
64 struct common_symbol {
65 STAILQ_ENTRY(common_symbol) link;
66 char* name;
67 caddr_t address;
68 };
69
70 struct linker_file {
71 KOBJ_FIELDS;
72 int refs; /* reference count */
73 int userrefs; /* kldload(2) count */
74 int flags;
75 #define LINKER_FILE_LINKED 0x1 /* file has been fully linked */
76 TAILQ_ENTRY(linker_file) link; /* list of all loaded files */
77 char* filename; /* file which was loaded */
78 char* pathname; /* file name with full path */
79 int id; /* unique id */
80 caddr_t address; /* load address */
81 size_t size; /* size of file */
82 int ndeps; /* number of dependencies */
83 linker_file_t* deps; /* list of dependencies */
84 STAILQ_HEAD(, common_symbol) common; /* list of common symbols */
85 TAILQ_HEAD(, module) modules; /* modules in this file */
86 TAILQ_ENTRY(linker_file) loaded; /* preload dependency support */
87 int loadcnt; /* load counter value */
88
89 /*
90 * Function Boundary Tracing (FBT) or Statically Defined Tracing (SDT)
91 * fields.
92 */
93 int nenabled; /* number of enabled probes. */
94 int fbt_nentries; /* number of fbt entries created. */
95 void *sdt_probes;
96 int sdt_nentries;
97 size_t sdt_nprobes;
98 size_t sdt_size;
99 };
100
101 /*
102 * Object implementing a class of file (a.out, elf, etc.)
103 */
104 typedef struct linker_class *linker_class_t;
105 typedef TAILQ_HEAD(, linker_class) linker_class_list_t;
106
107 struct linker_class {
108 KOBJ_CLASS_FIELDS;
109 TAILQ_ENTRY(linker_class) link; /* list of all file classes */
110 };
111
112 /*
113 * Function type used when iterating over the list of linker files.
114 */
115 typedef int linker_predicate_t(linker_file_t, void *);
116
117 /*
118 * The "file" for the kernel.
119 */
120 extern linker_file_t linker_kernel_file;
121
122 /*
123 * Obtain a reference to a module, loading it if required.
124 */
125 int linker_reference_module(const char* _modname, struct mod_depend *_verinfo,
126 linker_file_t* _result);
127
128 /*
129 * Release a reference to a module, unloading it if there are no more
130 * references. Note that one should either provide a module name and
131 * optional version info or a linker file, but not both.
132 */
133 int linker_release_module(const char *_modname, struct mod_depend *_verinfo,
134 linker_file_t _file);
135
136 /*
137 * Iterate over all of the currently loaded linker files calling the
138 * predicate function while the function returns 0. Returns the value
139 * returned by the last predicate function.
140 */
141 int linker_file_foreach(linker_predicate_t *_predicate, void *_context);
142
143 /*
144 * Lookup a symbol in a file. If deps is TRUE, look in dependencies
145 * if not found in file.
146 */
147 caddr_t linker_file_lookup_symbol(linker_file_t _file, const char* _name,
148 int _deps);
149
150 /*
151 * Lookup a linker set in a file. Return pointers to the first entry,
152 * last + 1, and count of entries. Use: for (p = start; p < stop; p++) {}
153 * void *start is really: "struct yoursetmember ***start;"
154 */
155 int linker_file_lookup_set(linker_file_t _file, const char *_name,
156 void *_start, void *_stop, int *_count);
157
158 /*
159 * List all functions in a file.
160 */
161 int linker_file_function_listall(linker_file_t,
162 linker_function_nameval_callback_t, void *);
163
164 /*
165 * Functions soley for use by the linker class handlers.
166 */
167 int linker_add_class(linker_class_t _cls);
168 int linker_file_unload(linker_file_t _file, int flags);
169 int linker_load_dependencies(linker_file_t _lf);
170 linker_file_t linker_make_file(const char* _filename, linker_class_t _cls);
171
172 /*
173 * DDB Helpers, tuned specifically for ddb/db_kld.c
174 */
175 int linker_ddb_lookup(const char *_symstr, c_linker_sym_t *_sym);
176 int linker_ddb_search_symbol(caddr_t _value, c_linker_sym_t *_sym,
177 long *_diffp);
178 int linker_ddb_symbol_values(c_linker_sym_t _sym, linker_symval_t *_symval);
179 int linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen,
180 long *offset);
181
182 /*
183 * stack(9) helper for situations where kernel locking is required.
184 */
185 int linker_search_symbol_name(caddr_t value, char *buf, u_int buflen,
186 long *offset);
187
188
189 /* HWPMC helper */
190 void *linker_hwpmc_list_objects(void);
191
192 #endif /* _KERNEL */
193
194 /*
195 * Module information subtypes
196 */
197 #define MODINFO_END 0x0000 /* End of list */
198 #define MODINFO_NAME 0x0001 /* Name of module (string) */
199 #define MODINFO_TYPE 0x0002 /* Type of module (string) */
200 #define MODINFO_ADDR 0x0003 /* Loaded address */
201 #define MODINFO_SIZE 0x0004 /* Size of module */
202 #define MODINFO_EMPTY 0x0005 /* Has been deleted */
203 #define MODINFO_ARGS 0x0006 /* Parameters string */
204 #define MODINFO_METADATA 0x8000 /* Module-specfic */
205
206 #define MODINFOMD_AOUTEXEC 0x0001 /* a.out exec header */
207 #define MODINFOMD_ELFHDR 0x0002 /* ELF header */
208 #define MODINFOMD_SSYM 0x0003 /* start of symbols */
209 #define MODINFOMD_ESYM 0x0004 /* end of symbols */
210 #define MODINFOMD_DYNAMIC 0x0005 /* _DYNAMIC pointer */
211 /* These values are MD on these two platforms */
212 #if !defined(__sparc64__) && !defined(__powerpc__)
213 #define MODINFOMD_ENVP 0x0006 /* envp[] */
214 #define MODINFOMD_HOWTO 0x0007 /* boothowto */
215 #define MODINFOMD_KERNEND 0x0008 /* kernend */
216 #endif
217 #define MODINFOMD_SHDR 0x0009 /* section header table */
218 #define MODINFOMD_NOCOPY 0x8000 /* don't copy this metadata to the kernel */
219
220 #define MODINFOMD_DEPLIST (0x4001 | MODINFOMD_NOCOPY) /* depends on */
221
222 #ifdef _KERNEL
223 #define MD_FETCH(mdp, info, type) ({ \
224 type *__p; \
225 __p = (type *)preload_search_info((mdp), MODINFO_METADATA | (info)); \
226 __p ? *__p : 0; \
227 })
228 #endif
229
230 #define LINKER_HINTS_VERSION 1 /* linker.hints file version */
231
232 #ifdef _KERNEL
233
234 /*
235 * Module lookup
236 */
237 extern caddr_t preload_metadata;
238 extern caddr_t preload_search_by_name(const char *_name);
239 extern caddr_t preload_search_by_type(const char *_type);
240 extern caddr_t preload_search_next_name(caddr_t _base);
241 extern caddr_t preload_search_info(caddr_t _mod, int _inf);
242 extern void preload_delete_name(const char *_name);
243 extern void preload_bootstrap_relocate(vm_offset_t _offset);
244
245 #ifdef KLD_DEBUG
246
247 extern int kld_debug;
248 #define KLD_DEBUG_FILE 1 /* file load/unload */
249 #define KLD_DEBUG_SYM 2 /* symbol lookup */
250
251 #define KLD_DPF(cat, args) \
252 do { \
253 if (kld_debug & KLD_DEBUG_##cat) printf args; \
254 } while (0)
255
256 #else
257
258 #define KLD_DPF(cat, args)
259
260 #endif
261
262 typedef Elf_Addr elf_lookup_fn(linker_file_t, Elf_Size, int);
263
264 /* Support functions */
265 int elf_reloc(linker_file_t _lf, Elf_Addr base, const void *_rel, int _type, elf_lookup_fn _lu);
266 int elf_reloc_local(linker_file_t _lf, Elf_Addr base, const void *_rel, int _type, elf_lookup_fn _lu);
267 const Elf_Sym *elf_get_sym(linker_file_t _lf, Elf_Size _symidx);
268 const char *elf_get_symname(linker_file_t _lf, Elf_Size _symidx);
269
270 typedef struct linker_ctf {
271 const uint8_t *ctftab; /* Decompressed CTF data. */
272 int ctfcnt; /* Number of CTF data bytes. */
273 const Elf_Sym *symtab; /* Ptr to the symbol table. */
274 int nsym; /* Number of symbols. */
275 const char *strtab; /* Ptr to the string table. */
276 int strcnt; /* Number of string bytes. */
277 uint32_t **ctfoffp; /* Ptr to array of obj/fnc offsets. */
278 uint32_t **typoffp; /* Ptr to array of type offsets. */
279 long *typlenp; /* Ptr to number of type data entries. */
280 } linker_ctf_t;
281
282 int linker_ctf_get(linker_file_t, linker_ctf_t *);
283
284 int elf_cpu_load_file(linker_file_t);
285 int elf_cpu_unload_file(linker_file_t);
286
287 /* values for type */
288 #define ELF_RELOC_REL 1
289 #define ELF_RELOC_RELA 2
290
291 /*
292 * This is version 1 of the KLD file status structure. It is identified
293 * by its _size_ in the version field.
294 */
295 struct kld_file_stat_1 {
296 int version; /* set to sizeof(struct kld_file_stat_1) */
297 char name[MAXPATHLEN];
298 int refs;
299 int id;
300 caddr_t address; /* load address */
301 size_t size; /* size in bytes */
302 };
303 #endif /* _KERNEL */
304
305 struct kld_file_stat {
306 int version; /* set to sizeof(struct kld_file_stat) */
307 char name[MAXPATHLEN];
308 int refs;
309 int id;
310 caddr_t address; /* load address */
311 size_t size; /* size in bytes */
312 char pathname[MAXPATHLEN];
313 };
314
315 struct kld_sym_lookup {
316 int version; /* set to sizeof(struct kld_sym_lookup) */
317 char *symname; /* Symbol name we are looking up */
318 u_long symvalue;
319 size_t symsize;
320 };
321 #define KLDSYM_LOOKUP 1
322
323 /*
324 * Flags for kldunloadf() and linker_file_unload()
325 */
326 #define LINKER_UNLOAD_NORMAL 0
327 #define LINKER_UNLOAD_FORCE 1
328
329 #ifndef _KERNEL
330
331 #include <sys/cdefs.h>
332
333 __BEGIN_DECLS
334 int kldload(const char* _file);
335 int kldunload(int _fileid);
336 int kldunloadf(int _fileid, int flags);
337 int kldfind(const char* _file);
338 int kldnext(int _fileid);
339 int kldstat(int _fileid, struct kld_file_stat* _stat);
340 int kldfirstmod(int _fileid);
341 int kldsym(int _fileid, int _cmd, void *_data);
342 __END_DECLS
343
344 #endif
345
346 #endif /* !_SYS_LINKER_H_ */
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