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1 | #ifndef _LINUX_MODULE_H | |
2 | #define _LINUX_MODULE_H | |
3 | /* | |
4 | * Dynamic loading of modules into the kernel. | |
5 | * | |
6 | * Rewritten by Richard Henderson <rth@tamu.edu> Dec 1996 | |
7 | * Rewritten again by Rusty Russell, 2002 | |
8 | */ | |
9 | #include <linux/list.h> | |
10 | #include <linux/stat.h> | |
11 | #include <linux/compiler.h> | |
12 | #include <linux/cache.h> | |
13 | #include <linux/kmod.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/elf.h> | |
16 | #include <linux/stringify.h> | |
17 | #include <linux/kobject.h> | |
18 | #include <linux/moduleparam.h> | |
19 | #include <linux/jump_label.h> | |
20 | #include <linux/export.h> | |
21 | #include <linux/extable.h> /* only as arch move module.h -> extable.h */ | |
22 | #include <linux/rbtree_latch.h> | |
23 | ||
24 | #include <linux/percpu.h> | |
25 | #include <asm/module.h> | |
26 | ||
27 | /* In stripped ARM and x86-64 modules, ~ is surprisingly rare. */ | |
28 | #define MODULE_SIG_STRING "~Module signature appended~\n" | |
29 | ||
30 | /* Not Yet Implemented */ | |
31 | #define MODULE_SUPPORTED_DEVICE(name) | |
32 | ||
33 | #define MODULE_NAME_LEN MAX_PARAM_PREFIX_LEN | |
34 | ||
35 | struct modversion_info { | |
36 | unsigned long crc; | |
37 | char name[MODULE_NAME_LEN]; | |
38 | }; | |
39 | ||
40 | struct module; | |
41 | struct exception_table_entry; | |
42 | ||
43 | struct module_kobject { | |
44 | struct kobject kobj; | |
45 | struct module *mod; | |
46 | struct kobject *drivers_dir; | |
47 | struct module_param_attrs *mp; | |
48 | struct completion *kobj_completion; | |
49 | }; | |
50 | ||
51 | struct module_attribute { | |
52 | struct attribute attr; | |
53 | ssize_t (*show)(struct module_attribute *, struct module_kobject *, | |
54 | char *); | |
55 | ssize_t (*store)(struct module_attribute *, struct module_kobject *, | |
56 | const char *, size_t count); | |
57 | void (*setup)(struct module *, const char *); | |
58 | int (*test)(struct module *); | |
59 | void (*free)(struct module *); | |
60 | }; | |
61 | ||
62 | struct module_version_attribute { | |
63 | struct module_attribute mattr; | |
64 | const char *module_name; | |
65 | const char *version; | |
66 | } __attribute__ ((__aligned__(sizeof(void *)))); | |
67 | ||
68 | extern ssize_t __modver_version_show(struct module_attribute *, | |
69 | struct module_kobject *, char *); | |
70 | ||
71 | extern struct module_attribute module_uevent; | |
72 | ||
73 | /* These are either module local, or the kernel's dummy ones. */ | |
74 | extern int init_module(void); | |
75 | extern void cleanup_module(void); | |
76 | ||
77 | #ifndef MODULE | |
78 | /** | |
79 | * module_init() - driver initialization entry point | |
80 | * @x: function to be run at kernel boot time or module insertion | |
81 | * | |
82 | * module_init() will either be called during do_initcalls() (if | |
83 | * builtin) or at module insertion time (if a module). There can only | |
84 | * be one per module. | |
85 | */ | |
86 | #define module_init(x) __initcall(x); | |
87 | ||
88 | /** | |
89 | * module_exit() - driver exit entry point | |
90 | * @x: function to be run when driver is removed | |
91 | * | |
92 | * module_exit() will wrap the driver clean-up code | |
93 | * with cleanup_module() when used with rmmod when | |
94 | * the driver is a module. If the driver is statically | |
95 | * compiled into the kernel, module_exit() has no effect. | |
96 | * There can only be one per module. | |
97 | */ | |
98 | #define module_exit(x) __exitcall(x); | |
99 | ||
100 | #else /* MODULE */ | |
101 | ||
102 | /* | |
103 | * In most cases loadable modules do not need custom | |
104 | * initcall levels. There are still some valid cases where | |
105 | * a driver may be needed early if built in, and does not | |
106 | * matter when built as a loadable module. Like bus | |
107 | * snooping debug drivers. | |
108 | */ | |
109 | #define early_initcall(fn) module_init(fn) | |
110 | #define core_initcall(fn) module_init(fn) | |
111 | #define core_initcall_sync(fn) module_init(fn) | |
112 | #define postcore_initcall(fn) module_init(fn) | |
113 | #define postcore_initcall_sync(fn) module_init(fn) | |
114 | #define arch_initcall(fn) module_init(fn) | |
115 | #define subsys_initcall(fn) module_init(fn) | |
116 | #define subsys_initcall_sync(fn) module_init(fn) | |
117 | #define fs_initcall(fn) module_init(fn) | |
118 | #define fs_initcall_sync(fn) module_init(fn) | |
119 | #define rootfs_initcall(fn) module_init(fn) | |
120 | #define device_initcall(fn) module_init(fn) | |
121 | #define device_initcall_sync(fn) module_init(fn) | |
122 | #define late_initcall(fn) module_init(fn) | |
123 | #define late_initcall_sync(fn) module_init(fn) | |
124 | ||
125 | #define console_initcall(fn) module_init(fn) | |
126 | #define security_initcall(fn) module_init(fn) | |
127 | ||
128 | /* Each module must use one module_init(). */ | |
129 | #define module_init(initfn) \ | |
130 | static inline initcall_t __inittest(void) \ | |
131 | { return initfn; } \ | |
132 | int init_module(void) __attribute__((alias(#initfn))); | |
133 | ||
134 | /* This is only required if you want to be unloadable. */ | |
135 | #define module_exit(exitfn) \ | |
136 | static inline exitcall_t __exittest(void) \ | |
137 | { return exitfn; } \ | |
138 | void cleanup_module(void) __attribute__((alias(#exitfn))); | |
139 | ||
140 | #endif | |
141 | ||
142 | /* This means "can be init if no module support, otherwise module load | |
143 | may call it." */ | |
144 | #ifdef CONFIG_MODULES | |
145 | #define __init_or_module | |
146 | #define __initdata_or_module | |
147 | #define __initconst_or_module | |
148 | #define __INIT_OR_MODULE .text | |
149 | #define __INITDATA_OR_MODULE .data | |
150 | #define __INITRODATA_OR_MODULE .section ".rodata","a",%progbits | |
151 | #else | |
152 | #define __init_or_module __init | |
153 | #define __initdata_or_module __initdata | |
154 | #define __initconst_or_module __initconst | |
155 | #define __INIT_OR_MODULE __INIT | |
156 | #define __INITDATA_OR_MODULE __INITDATA | |
157 | #define __INITRODATA_OR_MODULE __INITRODATA | |
158 | #endif /*CONFIG_MODULES*/ | |
159 | ||
160 | /* Generic info of form tag = "info" */ | |
161 | #define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info) | |
162 | ||
163 | /* For userspace: you can also call me... */ | |
164 | #define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias) | |
165 | ||
166 | /* Soft module dependencies. See man modprobe.d for details. | |
167 | * Example: MODULE_SOFTDEP("pre: module-foo module-bar post: module-baz") | |
168 | */ | |
169 | #define MODULE_SOFTDEP(_softdep) MODULE_INFO(softdep, _softdep) | |
170 | ||
171 | /* | |
172 | * The following license idents are currently accepted as indicating free | |
173 | * software modules | |
174 | * | |
175 | * "GPL" [GNU Public License v2 or later] | |
176 | * "GPL v2" [GNU Public License v2] | |
177 | * "GPL and additional rights" [GNU Public License v2 rights and more] | |
178 | * "Dual BSD/GPL" [GNU Public License v2 | |
179 | * or BSD license choice] | |
180 | * "Dual MIT/GPL" [GNU Public License v2 | |
181 | * or MIT license choice] | |
182 | * "Dual MPL/GPL" [GNU Public License v2 | |
183 | * or Mozilla license choice] | |
184 | * | |
185 | * The following other idents are available | |
186 | * | |
187 | * "Proprietary" [Non free products] | |
188 | * | |
189 | * There are dual licensed components, but when running with Linux it is the | |
190 | * GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL | |
191 | * is a GPL combined work. | |
192 | * | |
193 | * This exists for several reasons | |
194 | * 1. So modinfo can show license info for users wanting to vet their setup | |
195 | * is free | |
196 | * 2. So the community can ignore bug reports including proprietary modules | |
197 | * 3. So vendors can do likewise based on their own policies | |
198 | */ | |
199 | #define MODULE_LICENSE(_license) MODULE_INFO(license, _license) | |
200 | ||
201 | /* | |
202 | * Author(s), use "Name <email>" or just "Name", for multiple | |
203 | * authors use multiple MODULE_AUTHOR() statements/lines. | |
204 | */ | |
205 | #define MODULE_AUTHOR(_author) MODULE_INFO(author, _author) | |
206 | ||
207 | /* What your module does. */ | |
208 | #define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description) | |
209 | ||
210 | #ifdef MODULE | |
211 | /* Creates an alias so file2alias.c can find device table. */ | |
212 | #define MODULE_DEVICE_TABLE(type, name) \ | |
213 | extern const typeof(name) __mod_##type##__##name##_device_table \ | |
214 | __attribute__ ((unused, alias(__stringify(name)))) | |
215 | #else /* !MODULE */ | |
216 | #define MODULE_DEVICE_TABLE(type, name) | |
217 | #endif | |
218 | ||
219 | /* Version of form [<epoch>:]<version>[-<extra-version>]. | |
220 | * Or for CVS/RCS ID version, everything but the number is stripped. | |
221 | * <epoch>: A (small) unsigned integer which allows you to start versions | |
222 | * anew. If not mentioned, it's zero. eg. "2:1.0" is after | |
223 | * "1:2.0". | |
224 | ||
225 | * <version>: The <version> may contain only alphanumerics and the | |
226 | * character `.'. Ordered by numeric sort for numeric parts, | |
227 | * ascii sort for ascii parts (as per RPM or DEB algorithm). | |
228 | ||
229 | * <extraversion>: Like <version>, but inserted for local | |
230 | * customizations, eg "rh3" or "rusty1". | |
231 | ||
232 | * Using this automatically adds a checksum of the .c files and the | |
233 | * local headers in "srcversion". | |
234 | */ | |
235 | ||
236 | #if defined(MODULE) || !defined(CONFIG_SYSFS) | |
237 | #define MODULE_VERSION(_version) MODULE_INFO(version, _version) | |
238 | #else | |
239 | #define MODULE_VERSION(_version) \ | |
240 | static struct module_version_attribute ___modver_attr = { \ | |
241 | .mattr = { \ | |
242 | .attr = { \ | |
243 | .name = "version", \ | |
244 | .mode = S_IRUGO, \ | |
245 | }, \ | |
246 | .show = __modver_version_show, \ | |
247 | }, \ | |
248 | .module_name = KBUILD_MODNAME, \ | |
249 | .version = _version, \ | |
250 | }; \ | |
251 | static const struct module_version_attribute \ | |
252 | __used __attribute__ ((__section__ ("__modver"))) \ | |
253 | * __moduleparam_const __modver_attr = &___modver_attr | |
254 | #endif | |
255 | ||
256 | /* Optional firmware file (or files) needed by the module | |
257 | * format is simply firmware file name. Multiple firmware | |
258 | * files require multiple MODULE_FIRMWARE() specifiers */ | |
259 | #define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware) | |
260 | ||
261 | struct notifier_block; | |
262 | ||
263 | #ifdef CONFIG_MODULES | |
264 | ||
265 | extern int modules_disabled; /* for sysctl */ | |
266 | /* Get/put a kernel symbol (calls must be symmetric) */ | |
267 | void *__symbol_get(const char *symbol); | |
268 | void *__symbol_get_gpl(const char *symbol); | |
269 | #define symbol_get(x) ((typeof(&x))(__symbol_get(VMLINUX_SYMBOL_STR(x)))) | |
270 | ||
271 | /* modules using other modules: kdb wants to see this. */ | |
272 | struct module_use { | |
273 | struct list_head source_list; | |
274 | struct list_head target_list; | |
275 | struct module *source, *target; | |
276 | }; | |
277 | ||
278 | enum module_state { | |
279 | MODULE_STATE_LIVE, /* Normal state. */ | |
280 | MODULE_STATE_COMING, /* Full formed, running module_init. */ | |
281 | MODULE_STATE_GOING, /* Going away. */ | |
282 | MODULE_STATE_UNFORMED, /* Still setting it up. */ | |
283 | }; | |
284 | ||
285 | struct module; | |
286 | ||
287 | struct mod_tree_node { | |
288 | struct module *mod; | |
289 | struct latch_tree_node node; | |
290 | }; | |
291 | ||
292 | struct module_layout { | |
293 | /* The actual code + data. */ | |
294 | void *base; | |
295 | /* Total size. */ | |
296 | unsigned int size; | |
297 | /* The size of the executable code. */ | |
298 | unsigned int text_size; | |
299 | /* Size of RO section of the module (text+rodata) */ | |
300 | unsigned int ro_size; | |
301 | /* Size of RO after init section */ | |
302 | unsigned int ro_after_init_size; | |
303 | ||
304 | #ifdef CONFIG_MODULES_TREE_LOOKUP | |
305 | struct mod_tree_node mtn; | |
306 | #endif | |
307 | }; | |
308 | ||
309 | #ifdef CONFIG_MODULES_TREE_LOOKUP | |
310 | /* Only touch one cacheline for common rbtree-for-core-layout case. */ | |
311 | #define __module_layout_align ____cacheline_aligned | |
312 | #else | |
313 | #define __module_layout_align | |
314 | #endif | |
315 | ||
316 | struct mod_kallsyms { | |
317 | Elf_Sym *symtab; | |
318 | unsigned int num_symtab; | |
319 | char *strtab; | |
320 | }; | |
321 | ||
322 | #ifdef CONFIG_LIVEPATCH | |
323 | struct klp_modinfo { | |
324 | Elf_Ehdr hdr; | |
325 | Elf_Shdr *sechdrs; | |
326 | char *secstrings; | |
327 | unsigned int symndx; | |
328 | }; | |
329 | #endif | |
330 | ||
331 | struct module { | |
332 | enum module_state state; | |
333 | ||
334 | /* Member of list of modules */ | |
335 | struct list_head list; | |
336 | ||
337 | /* Unique handle for this module */ | |
338 | char name[MODULE_NAME_LEN]; | |
339 | ||
340 | /* Sysfs stuff. */ | |
341 | struct module_kobject mkobj; | |
342 | struct module_attribute *modinfo_attrs; | |
343 | const char *version; | |
344 | const char *srcversion; | |
345 | struct kobject *holders_dir; | |
346 | ||
347 | /* Exported symbols */ | |
348 | const struct kernel_symbol *syms; | |
349 | const unsigned long *crcs; | |
350 | unsigned int num_syms; | |
351 | ||
352 | /* Kernel parameters. */ | |
353 | #ifdef CONFIG_SYSFS | |
354 | struct mutex param_lock; | |
355 | #endif | |
356 | struct kernel_param *kp; | |
357 | unsigned int num_kp; | |
358 | ||
359 | /* GPL-only exported symbols. */ | |
360 | unsigned int num_gpl_syms; | |
361 | const struct kernel_symbol *gpl_syms; | |
362 | const unsigned long *gpl_crcs; | |
363 | ||
364 | #ifdef CONFIG_UNUSED_SYMBOLS | |
365 | /* unused exported symbols. */ | |
366 | const struct kernel_symbol *unused_syms; | |
367 | const unsigned long *unused_crcs; | |
368 | unsigned int num_unused_syms; | |
369 | ||
370 | /* GPL-only, unused exported symbols. */ | |
371 | unsigned int num_unused_gpl_syms; | |
372 | const struct kernel_symbol *unused_gpl_syms; | |
373 | const unsigned long *unused_gpl_crcs; | |
374 | #endif | |
375 | ||
376 | #ifdef CONFIG_MODULE_SIG | |
377 | /* Signature was verified. */ | |
378 | bool sig_ok; | |
379 | #endif | |
380 | ||
381 | bool async_probe_requested; | |
382 | ||
383 | /* symbols that will be GPL-only in the near future. */ | |
384 | const struct kernel_symbol *gpl_future_syms; | |
385 | const unsigned long *gpl_future_crcs; | |
386 | unsigned int num_gpl_future_syms; | |
387 | ||
388 | /* Exception table */ | |
389 | unsigned int num_exentries; | |
390 | struct exception_table_entry *extable; | |
391 | ||
392 | /* Startup function. */ | |
393 | int (*init)(void); | |
394 | ||
395 | /* Core layout: rbtree is accessed frequently, so keep together. */ | |
396 | struct module_layout core_layout __module_layout_align; | |
397 | struct module_layout init_layout; | |
398 | ||
399 | /* Arch-specific module values */ | |
400 | struct mod_arch_specific arch; | |
401 | ||
402 | unsigned long taints; /* same bits as kernel:taint_flags */ | |
403 | ||
404 | #ifdef CONFIG_GENERIC_BUG | |
405 | /* Support for BUG */ | |
406 | unsigned num_bugs; | |
407 | struct list_head bug_list; | |
408 | struct bug_entry *bug_table; | |
409 | #endif | |
410 | ||
411 | #ifdef CONFIG_KALLSYMS | |
412 | /* Protected by RCU and/or module_mutex: use rcu_dereference() */ | |
413 | struct mod_kallsyms *kallsyms; | |
414 | struct mod_kallsyms core_kallsyms; | |
415 | ||
416 | /* Section attributes */ | |
417 | struct module_sect_attrs *sect_attrs; | |
418 | ||
419 | /* Notes attributes */ | |
420 | struct module_notes_attrs *notes_attrs; | |
421 | #endif | |
422 | ||
423 | /* The command line arguments (may be mangled). People like | |
424 | keeping pointers to this stuff */ | |
425 | char *args; | |
426 | ||
427 | #ifdef CONFIG_SMP | |
428 | /* Per-cpu data. */ | |
429 | void __percpu *percpu; | |
430 | unsigned int percpu_size; | |
431 | #endif | |
432 | ||
433 | #ifdef CONFIG_TRACEPOINTS | |
434 | unsigned int num_tracepoints; | |
435 | struct tracepoint * const *tracepoints_ptrs; | |
436 | #endif | |
437 | #ifdef HAVE_JUMP_LABEL | |
438 | struct jump_entry *jump_entries; | |
439 | unsigned int num_jump_entries; | |
440 | #endif | |
441 | #ifdef CONFIG_TRACING | |
442 | unsigned int num_trace_bprintk_fmt; | |
443 | const char **trace_bprintk_fmt_start; | |
444 | #endif | |
445 | #ifdef CONFIG_EVENT_TRACING | |
446 | struct trace_event_call **trace_events; | |
447 | unsigned int num_trace_events; | |
448 | struct trace_enum_map **trace_enums; | |
449 | unsigned int num_trace_enums; | |
450 | #endif | |
451 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
452 | unsigned int num_ftrace_callsites; | |
453 | unsigned long *ftrace_callsites; | |
454 | #endif | |
455 | ||
456 | #ifdef CONFIG_LIVEPATCH | |
457 | bool klp; /* Is this a livepatch module? */ | |
458 | bool klp_alive; | |
459 | ||
460 | /* Elf information */ | |
461 | struct klp_modinfo *klp_info; | |
462 | #endif | |
463 | ||
464 | #ifdef CONFIG_MODULE_UNLOAD | |
465 | /* What modules depend on me? */ | |
466 | struct list_head source_list; | |
467 | /* What modules do I depend on? */ | |
468 | struct list_head target_list; | |
469 | ||
470 | /* Destruction function. */ | |
471 | void (*exit)(void); | |
472 | ||
473 | atomic_t refcnt; | |
474 | #endif | |
475 | ||
476 | #ifdef CONFIG_CONSTRUCTORS | |
477 | /* Constructor functions. */ | |
478 | ctor_fn_t *ctors; | |
479 | unsigned int num_ctors; | |
480 | #endif | |
481 | } ____cacheline_aligned; | |
482 | #ifndef MODULE_ARCH_INIT | |
483 | #define MODULE_ARCH_INIT {} | |
484 | #endif | |
485 | ||
486 | extern struct mutex module_mutex; | |
487 | ||
488 | /* FIXME: It'd be nice to isolate modules during init, too, so they | |
489 | aren't used before they (may) fail. But presently too much code | |
490 | (IDE & SCSI) require entry into the module during init.*/ | |
491 | static inline int module_is_live(struct module *mod) | |
492 | { | |
493 | return mod->state != MODULE_STATE_GOING; | |
494 | } | |
495 | ||
496 | struct module *__module_text_address(unsigned long addr); | |
497 | struct module *__module_address(unsigned long addr); | |
498 | bool is_module_address(unsigned long addr); | |
499 | bool is_module_percpu_address(unsigned long addr); | |
500 | bool is_module_text_address(unsigned long addr); | |
501 | ||
502 | static inline bool within_module_core(unsigned long addr, | |
503 | const struct module *mod) | |
504 | { | |
505 | return (unsigned long)mod->core_layout.base <= addr && | |
506 | addr < (unsigned long)mod->core_layout.base + mod->core_layout.size; | |
507 | } | |
508 | ||
509 | static inline bool within_module_init(unsigned long addr, | |
510 | const struct module *mod) | |
511 | { | |
512 | return (unsigned long)mod->init_layout.base <= addr && | |
513 | addr < (unsigned long)mod->init_layout.base + mod->init_layout.size; | |
514 | } | |
515 | ||
516 | static inline bool within_module(unsigned long addr, const struct module *mod) | |
517 | { | |
518 | return within_module_init(addr, mod) || within_module_core(addr, mod); | |
519 | } | |
520 | ||
521 | /* Search for module by name: must hold module_mutex. */ | |
522 | struct module *find_module(const char *name); | |
523 | ||
524 | struct symsearch { | |
525 | const struct kernel_symbol *start, *stop; | |
526 | const unsigned long *crcs; | |
527 | enum { | |
528 | NOT_GPL_ONLY, | |
529 | GPL_ONLY, | |
530 | WILL_BE_GPL_ONLY, | |
531 | } licence; | |
532 | bool unused; | |
533 | }; | |
534 | ||
535 | /* | |
536 | * Search for an exported symbol by name. | |
537 | * | |
538 | * Must be called with module_mutex held or preemption disabled. | |
539 | */ | |
540 | const struct kernel_symbol *find_symbol(const char *name, | |
541 | struct module **owner, | |
542 | const unsigned long **crc, | |
543 | bool gplok, | |
544 | bool warn); | |
545 | ||
546 | /* | |
547 | * Walk the exported symbol table | |
548 | * | |
549 | * Must be called with module_mutex held or preemption disabled. | |
550 | */ | |
551 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, | |
552 | struct module *owner, | |
553 | void *data), void *data); | |
554 | ||
555 | /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if | |
556 | symnum out of range. */ | |
557 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, | |
558 | char *name, char *module_name, int *exported); | |
559 | ||
560 | /* Look for this name: can be of form module:name. */ | |
561 | unsigned long module_kallsyms_lookup_name(const char *name); | |
562 | ||
563 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
564 | struct module *, unsigned long), | |
565 | void *data); | |
566 | ||
567 | extern void __noreturn __module_put_and_exit(struct module *mod, | |
568 | long code); | |
569 | #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code) | |
570 | ||
571 | #ifdef CONFIG_MODULE_UNLOAD | |
572 | int module_refcount(struct module *mod); | |
573 | void __symbol_put(const char *symbol); | |
574 | #define symbol_put(x) __symbol_put(VMLINUX_SYMBOL_STR(x)) | |
575 | void symbol_put_addr(void *addr); | |
576 | ||
577 | /* Sometimes we know we already have a refcount, and it's easier not | |
578 | to handle the error case (which only happens with rmmod --wait). */ | |
579 | extern void __module_get(struct module *module); | |
580 | ||
581 | /* This is the Right Way to get a module: if it fails, it's being removed, | |
582 | * so pretend it's not there. */ | |
583 | extern bool try_module_get(struct module *module); | |
584 | ||
585 | extern void module_put(struct module *module); | |
586 | ||
587 | #else /*!CONFIG_MODULE_UNLOAD*/ | |
588 | static inline int try_module_get(struct module *module) | |
589 | { | |
590 | return !module || module_is_live(module); | |
591 | } | |
592 | static inline void module_put(struct module *module) | |
593 | { | |
594 | } | |
595 | static inline void __module_get(struct module *module) | |
596 | { | |
597 | } | |
598 | #define symbol_put(x) do { } while (0) | |
599 | #define symbol_put_addr(p) do { } while (0) | |
600 | ||
601 | #endif /* CONFIG_MODULE_UNLOAD */ | |
602 | int ref_module(struct module *a, struct module *b); | |
603 | ||
604 | /* This is a #define so the string doesn't get put in every .o file */ | |
605 | #define module_name(mod) \ | |
606 | ({ \ | |
607 | struct module *__mod = (mod); \ | |
608 | __mod ? __mod->name : "kernel"; \ | |
609 | }) | |
610 | ||
611 | /* For kallsyms to ask for address resolution. namebuf should be at | |
612 | * least KSYM_NAME_LEN long: a pointer to namebuf is returned if | |
613 | * found, otherwise NULL. */ | |
614 | const char *module_address_lookup(unsigned long addr, | |
615 | unsigned long *symbolsize, | |
616 | unsigned long *offset, | |
617 | char **modname, | |
618 | char *namebuf); | |
619 | int lookup_module_symbol_name(unsigned long addr, char *symname); | |
620 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name); | |
621 | ||
622 | int register_module_notifier(struct notifier_block *nb); | |
623 | int unregister_module_notifier(struct notifier_block *nb); | |
624 | ||
625 | extern void print_modules(void); | |
626 | ||
627 | static inline bool module_requested_async_probing(struct module *module) | |
628 | { | |
629 | return module && module->async_probe_requested; | |
630 | } | |
631 | ||
632 | #ifdef CONFIG_LIVEPATCH | |
633 | static inline bool is_livepatch_module(struct module *mod) | |
634 | { | |
635 | return mod->klp; | |
636 | } | |
637 | #else /* !CONFIG_LIVEPATCH */ | |
638 | static inline bool is_livepatch_module(struct module *mod) | |
639 | { | |
640 | return false; | |
641 | } | |
642 | #endif /* CONFIG_LIVEPATCH */ | |
643 | ||
644 | #else /* !CONFIG_MODULES... */ | |
645 | ||
646 | static inline struct module *__module_address(unsigned long addr) | |
647 | { | |
648 | return NULL; | |
649 | } | |
650 | ||
651 | static inline struct module *__module_text_address(unsigned long addr) | |
652 | { | |
653 | return NULL; | |
654 | } | |
655 | ||
656 | static inline bool is_module_address(unsigned long addr) | |
657 | { | |
658 | return false; | |
659 | } | |
660 | ||
661 | static inline bool is_module_percpu_address(unsigned long addr) | |
662 | { | |
663 | return false; | |
664 | } | |
665 | ||
666 | static inline bool is_module_text_address(unsigned long addr) | |
667 | { | |
668 | return false; | |
669 | } | |
670 | ||
671 | /* Get/put a kernel symbol (calls should be symmetric) */ | |
672 | #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); }) | |
673 | #define symbol_put(x) do { } while (0) | |
674 | #define symbol_put_addr(x) do { } while (0) | |
675 | ||
676 | static inline void __module_get(struct module *module) | |
677 | { | |
678 | } | |
679 | ||
680 | static inline int try_module_get(struct module *module) | |
681 | { | |
682 | return 1; | |
683 | } | |
684 | ||
685 | static inline void module_put(struct module *module) | |
686 | { | |
687 | } | |
688 | ||
689 | #define module_name(mod) "kernel" | |
690 | ||
691 | /* For kallsyms to ask for address resolution. NULL means not found. */ | |
692 | static inline const char *module_address_lookup(unsigned long addr, | |
693 | unsigned long *symbolsize, | |
694 | unsigned long *offset, | |
695 | char **modname, | |
696 | char *namebuf) | |
697 | { | |
698 | return NULL; | |
699 | } | |
700 | ||
701 | static inline int lookup_module_symbol_name(unsigned long addr, char *symname) | |
702 | { | |
703 | return -ERANGE; | |
704 | } | |
705 | ||
706 | static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name) | |
707 | { | |
708 | return -ERANGE; | |
709 | } | |
710 | ||
711 | static inline int module_get_kallsym(unsigned int symnum, unsigned long *value, | |
712 | char *type, char *name, | |
713 | char *module_name, int *exported) | |
714 | { | |
715 | return -ERANGE; | |
716 | } | |
717 | ||
718 | static inline unsigned long module_kallsyms_lookup_name(const char *name) | |
719 | { | |
720 | return 0; | |
721 | } | |
722 | ||
723 | static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
724 | struct module *, | |
725 | unsigned long), | |
726 | void *data) | |
727 | { | |
728 | return 0; | |
729 | } | |
730 | ||
731 | static inline int register_module_notifier(struct notifier_block *nb) | |
732 | { | |
733 | /* no events will happen anyway, so this can always succeed */ | |
734 | return 0; | |
735 | } | |
736 | ||
737 | static inline int unregister_module_notifier(struct notifier_block *nb) | |
738 | { | |
739 | return 0; | |
740 | } | |
741 | ||
742 | #define module_put_and_exit(code) do_exit(code) | |
743 | ||
744 | static inline void print_modules(void) | |
745 | { | |
746 | } | |
747 | ||
748 | static inline bool module_requested_async_probing(struct module *module) | |
749 | { | |
750 | return false; | |
751 | } | |
752 | ||
753 | #endif /* CONFIG_MODULES */ | |
754 | ||
755 | #ifdef CONFIG_SYSFS | |
756 | extern struct kset *module_kset; | |
757 | extern struct kobj_type module_ktype; | |
758 | extern int module_sysfs_initialized; | |
759 | #endif /* CONFIG_SYSFS */ | |
760 | ||
761 | #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x) | |
762 | ||
763 | /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */ | |
764 | ||
765 | #define __MODULE_STRING(x) __stringify(x) | |
766 | ||
767 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX | |
768 | extern void set_all_modules_text_rw(void); | |
769 | extern void set_all_modules_text_ro(void); | |
770 | extern void module_enable_ro(const struct module *mod, bool after_init); | |
771 | extern void module_disable_ro(const struct module *mod); | |
772 | #else | |
773 | static inline void set_all_modules_text_rw(void) { } | |
774 | static inline void set_all_modules_text_ro(void) { } | |
775 | static inline void module_enable_ro(const struct module *mod, bool after_init) { } | |
776 | static inline void module_disable_ro(const struct module *mod) { } | |
777 | #endif | |
778 | ||
779 | #ifdef CONFIG_GENERIC_BUG | |
780 | void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *, | |
781 | struct module *); | |
782 | void module_bug_cleanup(struct module *); | |
783 | ||
784 | #else /* !CONFIG_GENERIC_BUG */ | |
785 | ||
786 | static inline void module_bug_finalize(const Elf_Ehdr *hdr, | |
787 | const Elf_Shdr *sechdrs, | |
788 | struct module *mod) | |
789 | { | |
790 | } | |
791 | static inline void module_bug_cleanup(struct module *mod) {} | |
792 | #endif /* CONFIG_GENERIC_BUG */ | |
793 | ||
794 | #ifdef CONFIG_MODULE_SIG | |
795 | static inline bool module_sig_ok(struct module *module) | |
796 | { | |
797 | return module->sig_ok; | |
798 | } | |
799 | #else /* !CONFIG_MODULE_SIG */ | |
800 | static inline bool module_sig_ok(struct module *module) | |
801 | { | |
802 | return true; | |
803 | } | |
804 | #endif /* CONFIG_MODULE_SIG */ | |
805 | ||
806 | #endif /* _LINUX_MODULE_H */ |