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TOMOYO Linux Cross Reference
Linux/include/linux/module.h

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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/elf.h>
 15 #include <linux/stringify.h>
 16 #include <linux/kobject.h>
 17 #include <linux/moduleparam.h>
 18 #include <linux/jump_label.h>
 19 #include <linux/export.h>
 20 
 21 #include <linux/percpu.h>
 22 #include <asm/module.h>
 23 
 24 /* In stripped ARM and x86-64 modules, ~ is surprisingly rare. */
 25 #define MODULE_SIG_STRING "~Module signature appended~\n"
 26 
 27 /* Not Yet Implemented */
 28 #define MODULE_SUPPORTED_DEVICE(name)
 29 
 30 #define MODULE_NAME_LEN MAX_PARAM_PREFIX_LEN
 31 
 32 struct modversion_info {
 33         unsigned long crc;
 34         char name[MODULE_NAME_LEN];
 35 };
 36 
 37 struct module;
 38 
 39 struct module_kobject {
 40         struct kobject kobj;
 41         struct module *mod;
 42         struct kobject *drivers_dir;
 43         struct module_param_attrs *mp;
 44         struct completion *kobj_completion;
 45 };
 46 
 47 struct module_attribute {
 48         struct attribute attr;
 49         ssize_t (*show)(struct module_attribute *, struct module_kobject *,
 50                         char *);
 51         ssize_t (*store)(struct module_attribute *, struct module_kobject *,
 52                          const char *, size_t count);
 53         void (*setup)(struct module *, const char *);
 54         int (*test)(struct module *);
 55         void (*free)(struct module *);
 56 };
 57 
 58 struct module_version_attribute {
 59         struct module_attribute mattr;
 60         const char *module_name;
 61         const char *version;
 62 } __attribute__ ((__aligned__(sizeof(void *))));
 63 
 64 extern ssize_t __modver_version_show(struct module_attribute *,
 65                                      struct module_kobject *, char *);
 66 
 67 extern struct module_attribute module_uevent;
 68 
 69 /* These are either module local, or the kernel's dummy ones. */
 70 extern int init_module(void);
 71 extern void cleanup_module(void);
 72 
 73 /* Archs provide a method of finding the correct exception table. */
 74 struct exception_table_entry;
 75 
 76 const struct exception_table_entry *
 77 search_extable(const struct exception_table_entry *first,
 78                const struct exception_table_entry *last,
 79                unsigned long value);
 80 void sort_extable(struct exception_table_entry *start,
 81                   struct exception_table_entry *finish);
 82 void sort_main_extable(void);
 83 void trim_init_extable(struct module *m);
 84 
 85 /* Generic info of form tag = "info" */
 86 #define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
 87 
 88 /* For userspace: you can also call me... */
 89 #define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
 90 
 91 /* Soft module dependencies. See man modprobe.d for details.
 92  * Example: MODULE_SOFTDEP("pre: module-foo module-bar post: module-baz")
 93  */
 94 #define MODULE_SOFTDEP(_softdep) MODULE_INFO(softdep, _softdep)
 95 
 96 /*
 97  * The following license idents are currently accepted as indicating free
 98  * software modules
 99  *
100  *      "GPL"                           [GNU Public License v2 or later]
101  *      "GPL v2"                        [GNU Public License v2]
102  *      "GPL and additional rights"     [GNU Public License v2 rights and more]
103  *      "Dual BSD/GPL"                  [GNU Public License v2
104  *                                       or BSD license choice]
105  *      "Dual MIT/GPL"                  [GNU Public License v2
106  *                                       or MIT license choice]
107  *      "Dual MPL/GPL"                  [GNU Public License v2
108  *                                       or Mozilla license choice]
109  *
110  * The following other idents are available
111  *
112  *      "Proprietary"                   [Non free products]
113  *
114  * There are dual licensed components, but when running with Linux it is the
115  * GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL
116  * is a GPL combined work.
117  *
118  * This exists for several reasons
119  * 1.   So modinfo can show license info for users wanting to vet their setup
120  *      is free
121  * 2.   So the community can ignore bug reports including proprietary modules
122  * 3.   So vendors can do likewise based on their own policies
123  */
124 #define MODULE_LICENSE(_license) MODULE_INFO(license, _license)
125 
126 /*
127  * Author(s), use "Name <email>" or just "Name", for multiple
128  * authors use multiple MODULE_AUTHOR() statements/lines.
129  */
130 #define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
131 
132 /* What your module does. */
133 #define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
134 
135 #ifdef MODULE
136 /* Creates an alias so file2alias.c can find device table. */
137 #define MODULE_DEVICE_TABLE(type, name)                                 \
138 extern const typeof(name) __mod_##type##__##name##_device_table         \
139   __attribute__ ((unused, alias(__stringify(name))))
140 #else  /* !MODULE */
141 #define MODULE_DEVICE_TABLE(type, name)
142 #endif
143 
144 /* Version of form [<epoch>:]<version>[-<extra-version>].
145  * Or for CVS/RCS ID version, everything but the number is stripped.
146  * <epoch>: A (small) unsigned integer which allows you to start versions
147  * anew. If not mentioned, it's zero.  eg. "2:1.0" is after
148  * "1:2.0".
149 
150  * <version>: The <version> may contain only alphanumerics and the
151  * character `.'.  Ordered by numeric sort for numeric parts,
152  * ascii sort for ascii parts (as per RPM or DEB algorithm).
153 
154  * <extraversion>: Like <version>, but inserted for local
155  * customizations, eg "rh3" or "rusty1".
156 
157  * Using this automatically adds a checksum of the .c files and the
158  * local headers in "srcversion".
159  */
160 
161 #if defined(MODULE) || !defined(CONFIG_SYSFS)
162 #define MODULE_VERSION(_version) MODULE_INFO(version, _version)
163 #else
164 #define MODULE_VERSION(_version)                                        \
165         static struct module_version_attribute ___modver_attr = {       \
166                 .mattr  = {                                             \
167                         .attr   = {                                     \
168                                 .name   = "version",                    \
169                                 .mode   = S_IRUGO,                      \
170                         },                                              \
171                         .show   = __modver_version_show,                \
172                 },                                                      \
173                 .module_name    = KBUILD_MODNAME,                       \
174                 .version        = _version,                             \
175         };                                                              \
176         static const struct module_version_attribute                    \
177         __used __attribute__ ((__section__ ("__modver")))               \
178         * __moduleparam_const __modver_attr = &___modver_attr
179 #endif
180 
181 /* Optional firmware file (or files) needed by the module
182  * format is simply firmware file name.  Multiple firmware
183  * files require multiple MODULE_FIRMWARE() specifiers */
184 #define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
185 
186 /* Given an address, look for it in the exception tables */
187 const struct exception_table_entry *search_exception_tables(unsigned long add);
188 
189 struct notifier_block;
190 
191 #ifdef CONFIG_MODULES
192 
193 extern int modules_disabled; /* for sysctl */
194 /* Get/put a kernel symbol (calls must be symmetric) */
195 void *__symbol_get(const char *symbol);
196 void *__symbol_get_gpl(const char *symbol);
197 #define symbol_get(x) ((typeof(&x))(__symbol_get(VMLINUX_SYMBOL_STR(x))))
198 
199 /* modules using other modules: kdb wants to see this. */
200 struct module_use {
201         struct list_head source_list;
202         struct list_head target_list;
203         struct module *source, *target;
204 };
205 
206 enum module_state {
207         MODULE_STATE_LIVE,      /* Normal state. */
208         MODULE_STATE_COMING,    /* Full formed, running module_init. */
209         MODULE_STATE_GOING,     /* Going away. */
210         MODULE_STATE_UNFORMED,  /* Still setting it up. */
211 };
212 
213 struct mod_kallsyms {
214         Elf_Sym *symtab;
215         unsigned int num_symtab;
216         char *strtab;
217 };
218 
219 struct module {
220         enum module_state state;
221 
222         /* Member of list of modules */
223         struct list_head list;
224 
225         /* Unique handle for this module */
226         char name[MODULE_NAME_LEN];
227 
228         /* Sysfs stuff. */
229         struct module_kobject mkobj;
230         struct module_attribute *modinfo_attrs;
231         const char *version;
232         const char *srcversion;
233         struct kobject *holders_dir;
234 
235         /* Exported symbols */
236         const struct kernel_symbol *syms;
237         const unsigned long *crcs;
238         unsigned int num_syms;
239 
240         /* Kernel parameters. */
241         struct kernel_param *kp;
242         unsigned int num_kp;
243 
244         /* GPL-only exported symbols. */
245         unsigned int num_gpl_syms;
246         const struct kernel_symbol *gpl_syms;
247         const unsigned long *gpl_crcs;
248 
249 #ifdef CONFIG_UNUSED_SYMBOLS
250         /* unused exported symbols. */
251         const struct kernel_symbol *unused_syms;
252         const unsigned long *unused_crcs;
253         unsigned int num_unused_syms;
254 
255         /* GPL-only, unused exported symbols. */
256         unsigned int num_unused_gpl_syms;
257         const struct kernel_symbol *unused_gpl_syms;
258         const unsigned long *unused_gpl_crcs;
259 #endif
260 
261 #ifdef CONFIG_MODULE_SIG
262         /* Signature was verified. */
263         bool sig_ok;
264 #endif
265 
266         /* symbols that will be GPL-only in the near future. */
267         const struct kernel_symbol *gpl_future_syms;
268         const unsigned long *gpl_future_crcs;
269         unsigned int num_gpl_future_syms;
270 
271         /* Exception table */
272         unsigned int num_exentries;
273         struct exception_table_entry *extable;
274 
275         /* Startup function. */
276         int (*init)(void);
277 
278         /* If this is non-NULL, vfree after init() returns */
279         void *module_init;
280 
281         /* Here is the actual code + data, vfree'd on unload. */
282         void *module_core;
283 
284         /* Here are the sizes of the init and core sections */
285         unsigned int init_size, core_size;
286 
287         /* The size of the executable code in each section.  */
288         unsigned int init_text_size, core_text_size;
289 
290         /* Size of RO sections of the module (text+rodata) */
291         unsigned int init_ro_size, core_ro_size;
292 
293         /* Arch-specific module values */
294         struct mod_arch_specific arch;
295 
296         unsigned int taints;    /* same bits as kernel:tainted */
297 
298 #ifdef CONFIG_GENERIC_BUG
299         /* Support for BUG */
300         unsigned num_bugs;
301         struct list_head bug_list;
302         struct bug_entry *bug_table;
303 #endif
304 
305 #ifdef CONFIG_KALLSYMS
306         /* Protected by RCU and/or module_mutex: use rcu_dereference() */
307         struct mod_kallsyms *kallsyms;
308         struct mod_kallsyms core_kallsyms;
309 
310         /* Section attributes */
311         struct module_sect_attrs *sect_attrs;
312 
313         /* Notes attributes */
314         struct module_notes_attrs *notes_attrs;
315 #endif
316 
317         /* The command line arguments (may be mangled).  People like
318            keeping pointers to this stuff */
319         char *args;
320 
321 #ifdef CONFIG_SMP
322         /* Per-cpu data. */
323         void __percpu *percpu;
324         unsigned int percpu_size;
325 #endif
326 
327 #ifdef CONFIG_TRACEPOINTS
328         unsigned int num_tracepoints;
329         struct tracepoint * const *tracepoints_ptrs;
330 #endif
331 #ifdef HAVE_JUMP_LABEL
332         struct jump_entry *jump_entries;
333         unsigned int num_jump_entries;
334 #endif
335 #ifdef CONFIG_TRACING
336         unsigned int num_trace_bprintk_fmt;
337         const char **trace_bprintk_fmt_start;
338 #endif
339 #ifdef CONFIG_EVENT_TRACING
340         struct ftrace_event_call **trace_events;
341         unsigned int num_trace_events;
342         struct trace_enum_map **trace_enums;
343         unsigned int num_trace_enums;
344 #endif
345 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
346         unsigned int num_ftrace_callsites;
347         unsigned long *ftrace_callsites;
348 #endif
349 
350 #ifdef CONFIG_LIVEPATCH
351         bool klp_alive;
352 #endif
353 
354 #ifdef CONFIG_MODULE_UNLOAD
355         /* What modules depend on me? */
356         struct list_head source_list;
357         /* What modules do I depend on? */
358         struct list_head target_list;
359 
360         /* Destruction function. */
361         void (*exit)(void);
362 
363         atomic_t refcnt;
364 #endif
365 
366 #ifdef CONFIG_CONSTRUCTORS
367         /* Constructor functions. */
368         ctor_fn_t *ctors;
369         unsigned int num_ctors;
370 #endif
371 };
372 #ifndef MODULE_ARCH_INIT
373 #define MODULE_ARCH_INIT {}
374 #endif
375 
376 extern struct mutex module_mutex;
377 
378 /* FIXME: It'd be nice to isolate modules during init, too, so they
379    aren't used before they (may) fail.  But presently too much code
380    (IDE & SCSI) require entry into the module during init.*/
381 static inline int module_is_live(struct module *mod)
382 {
383         return mod->state != MODULE_STATE_GOING;
384 }
385 
386 struct module *__module_text_address(unsigned long addr);
387 struct module *__module_address(unsigned long addr);
388 bool is_module_address(unsigned long addr);
389 bool is_module_percpu_address(unsigned long addr);
390 bool is_module_text_address(unsigned long addr);
391 
392 static inline bool within_module_core(unsigned long addr,
393                                       const struct module *mod)
394 {
395         return (unsigned long)mod->module_core <= addr &&
396                addr < (unsigned long)mod->module_core + mod->core_size;
397 }
398 
399 static inline bool within_module_init(unsigned long addr,
400                                       const struct module *mod)
401 {
402         return (unsigned long)mod->module_init <= addr &&
403                addr < (unsigned long)mod->module_init + mod->init_size;
404 }
405 
406 static inline bool within_module(unsigned long addr, const struct module *mod)
407 {
408         return within_module_init(addr, mod) || within_module_core(addr, mod);
409 }
410 
411 /* Search for module by name: must hold module_mutex. */
412 struct module *find_module(const char *name);
413 
414 struct symsearch {
415         const struct kernel_symbol *start, *stop;
416         const unsigned long *crcs;
417         enum {
418                 NOT_GPL_ONLY,
419                 GPL_ONLY,
420                 WILL_BE_GPL_ONLY,
421         } licence;
422         bool unused;
423 };
424 
425 /* Search for an exported symbol by name. */
426 const struct kernel_symbol *find_symbol(const char *name,
427                                         struct module **owner,
428                                         const unsigned long **crc,
429                                         bool gplok,
430                                         bool warn);
431 
432 /* Walk the exported symbol table */
433 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
434                                     struct module *owner,
435                                     void *data), void *data);
436 
437 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
438    symnum out of range. */
439 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
440                         char *name, char *module_name, int *exported);
441 
442 /* Look for this name: can be of form module:name. */
443 unsigned long module_kallsyms_lookup_name(const char *name);
444 
445 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
446                                              struct module *, unsigned long),
447                                    void *data);
448 
449 extern void __module_put_and_exit(struct module *mod, long code)
450         __attribute__((noreturn));
451 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code)
452 
453 #ifdef CONFIG_MODULE_UNLOAD
454 int module_refcount(struct module *mod);
455 void __symbol_put(const char *symbol);
456 #define symbol_put(x) __symbol_put(VMLINUX_SYMBOL_STR(x))
457 void symbol_put_addr(void *addr);
458 
459 /* Sometimes we know we already have a refcount, and it's easier not
460    to handle the error case (which only happens with rmmod --wait). */
461 extern void __module_get(struct module *module);
462 
463 /* This is the Right Way to get a module: if it fails, it's being removed,
464  * so pretend it's not there. */
465 extern bool try_module_get(struct module *module);
466 
467 extern void module_put(struct module *module);
468 
469 #else /*!CONFIG_MODULE_UNLOAD*/
470 static inline int try_module_get(struct module *module)
471 {
472         return !module || module_is_live(module);
473 }
474 static inline void module_put(struct module *module)
475 {
476 }
477 static inline void __module_get(struct module *module)
478 {
479 }
480 #define symbol_put(x) do { } while (0)
481 #define symbol_put_addr(p) do { } while (0)
482 
483 #endif /* CONFIG_MODULE_UNLOAD */
484 int ref_module(struct module *a, struct module *b);
485 
486 /* This is a #define so the string doesn't get put in every .o file */
487 #define module_name(mod)                        \
488 ({                                              \
489         struct module *__mod = (mod);           \
490         __mod ? __mod->name : "kernel";         \
491 })
492 
493 /* For kallsyms to ask for address resolution.  namebuf should be at
494  * least KSYM_NAME_LEN long: a pointer to namebuf is returned if
495  * found, otherwise NULL. */
496 const char *module_address_lookup(unsigned long addr,
497                             unsigned long *symbolsize,
498                             unsigned long *offset,
499                             char **modname,
500                             char *namebuf);
501 int lookup_module_symbol_name(unsigned long addr, char *symname);
502 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
503 
504 /* For extable.c to search modules' exception tables. */
505 const struct exception_table_entry *search_module_extables(unsigned long addr);
506 
507 int register_module_notifier(struct notifier_block *nb);
508 int unregister_module_notifier(struct notifier_block *nb);
509 
510 extern void print_modules(void);
511 
512 #else /* !CONFIG_MODULES... */
513 
514 /* Given an address, look for it in the exception tables. */
515 static inline const struct exception_table_entry *
516 search_module_extables(unsigned long addr)
517 {
518         return NULL;
519 }
520 
521 static inline struct module *__module_address(unsigned long addr)
522 {
523         return NULL;
524 }
525 
526 static inline struct module *__module_text_address(unsigned long addr)
527 {
528         return NULL;
529 }
530 
531 static inline bool is_module_address(unsigned long addr)
532 {
533         return false;
534 }
535 
536 static inline bool is_module_percpu_address(unsigned long addr)
537 {
538         return false;
539 }
540 
541 static inline bool is_module_text_address(unsigned long addr)
542 {
543         return false;
544 }
545 
546 /* Get/put a kernel symbol (calls should be symmetric) */
547 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
548 #define symbol_put(x) do { } while (0)
549 #define symbol_put_addr(x) do { } while (0)
550 
551 static inline void __module_get(struct module *module)
552 {
553 }
554 
555 static inline int try_module_get(struct module *module)
556 {
557         return 1;
558 }
559 
560 static inline void module_put(struct module *module)
561 {
562 }
563 
564 #define module_name(mod) "kernel"
565 
566 /* For kallsyms to ask for address resolution.  NULL means not found. */
567 static inline const char *module_address_lookup(unsigned long addr,
568                                           unsigned long *symbolsize,
569                                           unsigned long *offset,
570                                           char **modname,
571                                           char *namebuf)
572 {
573         return NULL;
574 }
575 
576 static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
577 {
578         return -ERANGE;
579 }
580 
581 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
582 {
583         return -ERANGE;
584 }
585 
586 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
587                                         char *type, char *name,
588                                         char *module_name, int *exported)
589 {
590         return -ERANGE;
591 }
592 
593 static inline unsigned long module_kallsyms_lookup_name(const char *name)
594 {
595         return 0;
596 }
597 
598 static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
599                                                            struct module *,
600                                                            unsigned long),
601                                                  void *data)
602 {
603         return 0;
604 }
605 
606 static inline int register_module_notifier(struct notifier_block *nb)
607 {
608         /* no events will happen anyway, so this can always succeed */
609         return 0;
610 }
611 
612 static inline int unregister_module_notifier(struct notifier_block *nb)
613 {
614         return 0;
615 }
616 
617 #define module_put_and_exit(code) do_exit(code)
618 
619 static inline void print_modules(void)
620 {
621 }
622 #endif /* CONFIG_MODULES */
623 
624 #ifdef CONFIG_SYSFS
625 extern struct kset *module_kset;
626 extern struct kobj_type module_ktype;
627 extern int module_sysfs_initialized;
628 #endif /* CONFIG_SYSFS */
629 
630 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
631 
632 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
633 
634 #define __MODULE_STRING(x) __stringify(x)
635 
636 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
637 extern void set_all_modules_text_rw(void);
638 extern void set_all_modules_text_ro(void);
639 #else
640 static inline void set_all_modules_text_rw(void) { }
641 static inline void set_all_modules_text_ro(void) { }
642 #endif
643 
644 #ifdef CONFIG_GENERIC_BUG
645 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
646                          struct module *);
647 void module_bug_cleanup(struct module *);
648 
649 #else   /* !CONFIG_GENERIC_BUG */
650 
651 static inline void module_bug_finalize(const Elf_Ehdr *hdr,
652                                         const Elf_Shdr *sechdrs,
653                                         struct module *mod)
654 {
655 }
656 static inline void module_bug_cleanup(struct module *mod) {}
657 #endif  /* CONFIG_GENERIC_BUG */
658 
659 #endif /* _LINUX_MODULE_H */
660 

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