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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/tracepoint.h>
 19 #include <linux/export.h>
 20 
 21 #include <linux/percpu.h>
 22 #include <asm/module.h>
 23 
 24 /* Not Yet Implemented */
 25 #define MODULE_SUPPORTED_DEVICE(name)
 26 
 27 #define MODULE_NAME_LEN MAX_PARAM_PREFIX_LEN
 28 
 29 struct modversion_info
 30 {
 31         unsigned long crc;
 32         char name[MODULE_NAME_LEN];
 33 };
 34 
 35 struct module;
 36 
 37 struct module_kobject {
 38         struct kobject kobj;
 39         struct module *mod;
 40         struct kobject *drivers_dir;
 41         struct module_param_attrs *mp;
 42 };
 43 
 44 struct module_attribute {
 45         struct attribute attr;
 46         ssize_t (*show)(struct module_attribute *, struct module_kobject *,
 47                         char *);
 48         ssize_t (*store)(struct module_attribute *, struct module_kobject *,
 49                          const char *, size_t count);
 50         void (*setup)(struct module *, const char *);
 51         int (*test)(struct module *);
 52         void (*free)(struct module *);
 53 };
 54 
 55 struct module_version_attribute {
 56         struct module_attribute mattr;
 57         const char *module_name;
 58         const char *version;
 59 } __attribute__ ((__aligned__(sizeof(void *))));
 60 
 61 extern ssize_t __modver_version_show(struct module_attribute *,
 62                                      struct module_kobject *, char *);
 63 
 64 extern struct module_attribute module_uevent;
 65 
 66 /* These are either module local, or the kernel's dummy ones. */
 67 extern int init_module(void);
 68 extern void cleanup_module(void);
 69 
 70 /* Archs provide a method of finding the correct exception table. */
 71 struct exception_table_entry;
 72 
 73 const struct exception_table_entry *
 74 search_extable(const struct exception_table_entry *first,
 75                const struct exception_table_entry *last,
 76                unsigned long value);
 77 void sort_extable(struct exception_table_entry *start,
 78                   struct exception_table_entry *finish);
 79 void sort_main_extable(void);
 80 void trim_init_extable(struct module *m);
 81 
 82 #ifdef MODULE
 83 #define MODULE_GENERIC_TABLE(gtype,name)                        \
 84 extern const struct gtype##_id __mod_##gtype##_table            \
 85   __attribute__ ((unused, alias(__stringify(name))))
 86 
 87 #else  /* !MODULE */
 88 #define MODULE_GENERIC_TABLE(gtype,name)
 89 #endif
 90 
 91 /* Generic info of form tag = "info" */
 92 #define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
 93 
 94 /* For userspace: you can also call me... */
 95 #define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
 96 
 97 /*
 98  * The following license idents are currently accepted as indicating free
 99  * software modules
100  *
101  *      "GPL"                           [GNU Public License v2 or later]
102  *      "GPL v2"                        [GNU Public License v2]
103  *      "GPL and additional rights"     [GNU Public License v2 rights and more]
104  *      "Dual BSD/GPL"                  [GNU Public License v2
105  *                                       or BSD license choice]
106  *      "Dual MIT/GPL"                  [GNU Public License v2
107  *                                       or MIT license choice]
108  *      "Dual MPL/GPL"                  [GNU Public License v2
109  *                                       or Mozilla license choice]
110  *
111  * The following other idents are available
112  *
113  *      "Proprietary"                   [Non free products]
114  *
115  * There are dual licensed components, but when running with Linux it is the
116  * GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL
117  * is a GPL combined work.
118  *
119  * This exists for several reasons
120  * 1.   So modinfo can show license info for users wanting to vet their setup 
121  *      is free
122  * 2.   So the community can ignore bug reports including proprietary modules
123  * 3.   So vendors can do likewise based on their own policies
124  */
125 #define MODULE_LICENSE(_license) MODULE_INFO(license, _license)
126 
127 /*
128  * Author(s), use "Name <email>" or just "Name", for multiple
129  * authors use multiple MODULE_AUTHOR() statements/lines.
130  */
131 #define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
132   
133 /* What your module does. */
134 #define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
135 
136 #define MODULE_DEVICE_TABLE(type,name)          \
137   MODULE_GENERIC_TABLE(type##_device,name)
138 
139 /* Version of form [<epoch>:]<version>[-<extra-version>].
140    Or for CVS/RCS ID version, everything but the number is stripped.
141   <epoch>: A (small) unsigned integer which allows you to start versions
142            anew. If not mentioned, it's zero.  eg. "2:1.0" is after
143            "1:2.0".
144   <version>: The <version> may contain only alphanumerics and the
145            character `.'.  Ordered by numeric sort for numeric parts,
146            ascii sort for ascii parts (as per RPM or DEB algorithm).
147   <extraversion>: Like <version>, but inserted for local
148            customizations, eg "rh3" or "rusty1".
149 
150   Using this automatically adds a checksum of the .c files and the
151   local headers in "srcversion".
152 */
153 
154 #if defined(MODULE) || !defined(CONFIG_SYSFS)
155 #define MODULE_VERSION(_version) MODULE_INFO(version, _version)
156 #else
157 #define MODULE_VERSION(_version)                                        \
158         static struct module_version_attribute ___modver_attr = {       \
159                 .mattr  = {                                             \
160                         .attr   = {                                     \
161                                 .name   = "version",                    \
162                                 .mode   = S_IRUGO,                      \
163                         },                                              \
164                         .show   = __modver_version_show,                \
165                 },                                                      \
166                 .module_name    = KBUILD_MODNAME,                       \
167                 .version        = _version,                             \
168         };                                                              \
169         static const struct module_version_attribute                    \
170         __used __attribute__ ((__section__ ("__modver")))               \
171         * __moduleparam_const __modver_attr = &___modver_attr
172 #endif
173 
174 /* Optional firmware file (or files) needed by the module
175  * format is simply firmware file name.  Multiple firmware
176  * files require multiple MODULE_FIRMWARE() specifiers */
177 #define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
178 
179 /* Given an address, look for it in the exception tables */
180 const struct exception_table_entry *search_exception_tables(unsigned long add);
181 
182 struct notifier_block;
183 
184 #ifdef CONFIG_MODULES
185 
186 extern int modules_disabled; /* for sysctl */
187 /* Get/put a kernel symbol (calls must be symmetric) */
188 void *__symbol_get(const char *symbol);
189 void *__symbol_get_gpl(const char *symbol);
190 #define symbol_get(x) ((typeof(&x))(__symbol_get(MODULE_SYMBOL_PREFIX #x)))
191 
192 /* modules using other modules: kdb wants to see this. */
193 struct module_use {
194         struct list_head source_list;
195         struct list_head target_list;
196         struct module *source, *target;
197 };
198 
199 enum module_state
200 {
201         MODULE_STATE_LIVE,
202         MODULE_STATE_COMING,
203         MODULE_STATE_GOING,
204 };
205 
206 /**
207  * struct module_ref - per cpu module reference counts
208  * @incs: number of module get on this cpu
209  * @decs: number of module put on this cpu
210  *
211  * We force an alignment on 8 or 16 bytes, so that alloc_percpu()
212  * put @incs/@decs in same cache line, with no extra memory cost,
213  * since alloc_percpu() is fine grained.
214  */
215 struct module_ref {
216         unsigned long incs;
217         unsigned long decs;
218 } __attribute((aligned(2 * sizeof(unsigned long))));
219 
220 struct module
221 {
222         enum module_state state;
223 
224         /* Member of list of modules */
225         struct list_head list;
226 
227         /* Unique handle for this module */
228         char name[MODULE_NAME_LEN];
229 
230         /* Sysfs stuff. */
231         struct module_kobject mkobj;
232         struct module_attribute *modinfo_attrs;
233         const char *version;
234         const char *srcversion;
235         struct kobject *holders_dir;
236 
237         /* Exported symbols */
238         const struct kernel_symbol *syms;
239         const unsigned long *crcs;
240         unsigned int num_syms;
241 
242         /* Kernel parameters. */
243         struct kernel_param *kp;
244         unsigned int num_kp;
245 
246         /* GPL-only exported symbols. */
247         unsigned int num_gpl_syms;
248         const struct kernel_symbol *gpl_syms;
249         const unsigned long *gpl_crcs;
250 
251 #ifdef CONFIG_UNUSED_SYMBOLS
252         /* unused exported symbols. */
253         const struct kernel_symbol *unused_syms;
254         const unsigned long *unused_crcs;
255         unsigned int num_unused_syms;
256 
257         /* GPL-only, unused exported symbols. */
258         unsigned int num_unused_gpl_syms;
259         const struct kernel_symbol *unused_gpl_syms;
260         const unsigned long *unused_gpl_crcs;
261 #endif
262 
263         /* symbols that will be GPL-only in the near future. */
264         const struct kernel_symbol *gpl_future_syms;
265         const unsigned long *gpl_future_crcs;
266         unsigned int num_gpl_future_syms;
267 
268         /* Exception table */
269         unsigned int num_exentries;
270         struct exception_table_entry *extable;
271 
272         /* Startup function. */
273         int (*init)(void);
274 
275         /* If this is non-NULL, vfree after init() returns */
276         void *module_init;
277 
278         /* Here is the actual code + data, vfree'd on unload. */
279         void *module_core;
280 
281         /* Here are the sizes of the init and core sections */
282         unsigned int init_size, core_size;
283 
284         /* The size of the executable code in each section.  */
285         unsigned int init_text_size, core_text_size;
286 
287         /* Size of RO sections of the module (text+rodata) */
288         unsigned int init_ro_size, core_ro_size;
289 
290         /* Arch-specific module values */
291         struct mod_arch_specific arch;
292 
293         unsigned int taints;    /* same bits as kernel:tainted */
294 
295 #ifdef CONFIG_GENERIC_BUG
296         /* Support for BUG */
297         unsigned num_bugs;
298         struct list_head bug_list;
299         struct bug_entry *bug_table;
300 #endif
301 
302 #ifdef CONFIG_KALLSYMS
303         /*
304          * We keep the symbol and string tables for kallsyms.
305          * The core_* fields below are temporary, loader-only (they
306          * could really be discarded after module init).
307          */
308         Elf_Sym *symtab, *core_symtab;
309         unsigned int num_symtab, core_num_syms;
310         char *strtab, *core_strtab;
311 
312         /* Section attributes */
313         struct module_sect_attrs *sect_attrs;
314 
315         /* Notes attributes */
316         struct module_notes_attrs *notes_attrs;
317 #endif
318 
319         /* The command line arguments (may be mangled).  People like
320            keeping pointers to this stuff */
321         char *args;
322 
323 #ifdef CONFIG_SMP
324         /* Per-cpu data. */
325         void __percpu *percpu;
326         unsigned int percpu_size;
327 #endif
328 
329 #ifdef CONFIG_TRACEPOINTS
330         unsigned int num_tracepoints;
331         struct tracepoint * const *tracepoints_ptrs;
332 #endif
333 #ifdef HAVE_JUMP_LABEL
334         struct jump_entry *jump_entries;
335         unsigned int num_jump_entries;
336 #endif
337 #ifdef CONFIG_TRACING
338         unsigned int num_trace_bprintk_fmt;
339         const char **trace_bprintk_fmt_start;
340 #endif
341 #ifdef CONFIG_EVENT_TRACING
342         struct ftrace_event_call **trace_events;
343         unsigned int num_trace_events;
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_MODULE_UNLOAD
351         /* What modules depend on me? */
352         struct list_head source_list;
353         /* What modules do I depend on? */
354         struct list_head target_list;
355 
356         /* Who is waiting for us to be unloaded */
357         struct task_struct *waiter;
358 
359         /* Destruction function. */
360         void (*exit)(void);
361 
362         struct module_ref __percpu *refptr;
363 #endif
364 
365 #ifdef CONFIG_CONSTRUCTORS
366         /* Constructor functions. */
367         ctor_fn_t *ctors;
368         unsigned int num_ctors;
369 #endif
370 };
371 #ifndef MODULE_ARCH_INIT
372 #define MODULE_ARCH_INIT {}
373 #endif
374 
375 extern struct mutex module_mutex;
376 
377 /* FIXME: It'd be nice to isolate modules during init, too, so they
378    aren't used before they (may) fail.  But presently too much code
379    (IDE & SCSI) require entry into the module during init.*/
380 static inline int module_is_live(struct module *mod)
381 {
382         return mod->state != MODULE_STATE_GOING;
383 }
384 
385 struct module *__module_text_address(unsigned long addr);
386 struct module *__module_address(unsigned long addr);
387 bool is_module_address(unsigned long addr);
388 bool is_module_percpu_address(unsigned long addr);
389 bool is_module_text_address(unsigned long addr);
390 
391 static inline int within_module_core(unsigned long addr, struct module *mod)
392 {
393         return (unsigned long)mod->module_core <= addr &&
394                addr < (unsigned long)mod->module_core + mod->core_size;
395 }
396 
397 static inline int within_module_init(unsigned long addr, struct module *mod)
398 {
399         return (unsigned long)mod->module_init <= addr &&
400                addr < (unsigned long)mod->module_init + mod->init_size;
401 }
402 
403 /* Search for module by name: must hold module_mutex. */
404 struct module *find_module(const char *name);
405 
406 struct symsearch {
407         const struct kernel_symbol *start, *stop;
408         const unsigned long *crcs;
409         enum {
410                 NOT_GPL_ONLY,
411                 GPL_ONLY,
412                 WILL_BE_GPL_ONLY,
413         } licence;
414         bool unused;
415 };
416 
417 /* Search for an exported symbol by name. */
418 const struct kernel_symbol *find_symbol(const char *name,
419                                         struct module **owner,
420                                         const unsigned long **crc,
421                                         bool gplok,
422                                         bool warn);
423 
424 /* Walk the exported symbol table */
425 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
426                                     struct module *owner,
427                                     void *data), void *data);
428 
429 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
430    symnum out of range. */
431 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
432                         char *name, char *module_name, int *exported);
433 
434 /* Look for this name: can be of form module:name. */
435 unsigned long module_kallsyms_lookup_name(const char *name);
436 
437 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
438                                              struct module *, unsigned long),
439                                    void *data);
440 
441 extern void __module_put_and_exit(struct module *mod, long code)
442         __attribute__((noreturn));
443 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code);
444 
445 #ifdef CONFIG_MODULE_UNLOAD
446 unsigned long module_refcount(struct module *mod);
447 void __symbol_put(const char *symbol);
448 #define symbol_put(x) __symbol_put(MODULE_SYMBOL_PREFIX #x)
449 void symbol_put_addr(void *addr);
450 
451 /* Sometimes we know we already have a refcount, and it's easier not
452    to handle the error case (which only happens with rmmod --wait). */
453 extern void __module_get(struct module *module);
454 
455 /* This is the Right Way to get a module: if it fails, it's being removed,
456  * so pretend it's not there. */
457 extern bool try_module_get(struct module *module);
458 
459 extern void module_put(struct module *module);
460 
461 #else /*!CONFIG_MODULE_UNLOAD*/
462 static inline int try_module_get(struct module *module)
463 {
464         return !module || module_is_live(module);
465 }
466 static inline void module_put(struct module *module)
467 {
468 }
469 static inline void __module_get(struct module *module)
470 {
471 }
472 #define symbol_put(x) do { } while(0)
473 #define symbol_put_addr(p) do { } while(0)
474 
475 #endif /* CONFIG_MODULE_UNLOAD */
476 int ref_module(struct module *a, struct module *b);
477 
478 /* This is a #define so the string doesn't get put in every .o file */
479 #define module_name(mod)                        \
480 ({                                              \
481         struct module *__mod = (mod);           \
482         __mod ? __mod->name : "kernel";         \
483 })
484 
485 /* For kallsyms to ask for address resolution.  namebuf should be at
486  * least KSYM_NAME_LEN long: a pointer to namebuf is returned if
487  * found, otherwise NULL. */
488 const char *module_address_lookup(unsigned long addr,
489                             unsigned long *symbolsize,
490                             unsigned long *offset,
491                             char **modname,
492                             char *namebuf);
493 int lookup_module_symbol_name(unsigned long addr, char *symname);
494 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
495 
496 /* For extable.c to search modules' exception tables. */
497 const struct exception_table_entry *search_module_extables(unsigned long addr);
498 
499 int register_module_notifier(struct notifier_block * nb);
500 int unregister_module_notifier(struct notifier_block * nb);
501 
502 extern void print_modules(void);
503 
504 #else /* !CONFIG_MODULES... */
505 
506 /* Given an address, look for it in the exception tables. */
507 static inline const struct exception_table_entry *
508 search_module_extables(unsigned long addr)
509 {
510         return NULL;
511 }
512 
513 static inline struct module *__module_address(unsigned long addr)
514 {
515         return NULL;
516 }
517 
518 static inline struct module *__module_text_address(unsigned long addr)
519 {
520         return NULL;
521 }
522 
523 static inline bool is_module_address(unsigned long addr)
524 {
525         return false;
526 }
527 
528 static inline bool is_module_percpu_address(unsigned long addr)
529 {
530         return false;
531 }
532 
533 static inline bool is_module_text_address(unsigned long addr)
534 {
535         return false;
536 }
537 
538 /* Get/put a kernel symbol (calls should be symmetric) */
539 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
540 #define symbol_put(x) do { } while(0)
541 #define symbol_put_addr(x) do { } while(0)
542 
543 static inline void __module_get(struct module *module)
544 {
545 }
546 
547 static inline int try_module_get(struct module *module)
548 {
549         return 1;
550 }
551 
552 static inline void module_put(struct module *module)
553 {
554 }
555 
556 #define module_name(mod) "kernel"
557 
558 /* For kallsyms to ask for address resolution.  NULL means not found. */
559 static inline const char *module_address_lookup(unsigned long addr,
560                                           unsigned long *symbolsize,
561                                           unsigned long *offset,
562                                           char **modname,
563                                           char *namebuf)
564 {
565         return NULL;
566 }
567 
568 static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
569 {
570         return -ERANGE;
571 }
572 
573 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
574 {
575         return -ERANGE;
576 }
577 
578 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
579                                         char *type, char *name,
580                                         char *module_name, int *exported)
581 {
582         return -ERANGE;
583 }
584 
585 static inline unsigned long module_kallsyms_lookup_name(const char *name)
586 {
587         return 0;
588 }
589 
590 static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
591                                                            struct module *,
592                                                            unsigned long),
593                                                  void *data)
594 {
595         return 0;
596 }
597 
598 static inline int register_module_notifier(struct notifier_block * nb)
599 {
600         /* no events will happen anyway, so this can always succeed */
601         return 0;
602 }
603 
604 static inline int unregister_module_notifier(struct notifier_block * nb)
605 {
606         return 0;
607 }
608 
609 #define module_put_and_exit(code) do_exit(code)
610 
611 static inline void print_modules(void)
612 {
613 }
614 #endif /* CONFIG_MODULES */
615 
616 #ifdef CONFIG_SYSFS
617 extern struct kset *module_kset;
618 extern struct kobj_type module_ktype;
619 extern int module_sysfs_initialized;
620 #endif /* CONFIG_SYSFS */
621 
622 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
623 
624 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
625 
626 #define __MODULE_STRING(x) __stringify(x)
627 
628 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
629 extern void set_all_modules_text_rw(void);
630 extern void set_all_modules_text_ro(void);
631 #else
632 static inline void set_all_modules_text_rw(void) { }
633 static inline void set_all_modules_text_ro(void) { }
634 #endif
635 
636 #ifdef CONFIG_GENERIC_BUG
637 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
638                          struct module *);
639 void module_bug_cleanup(struct module *);
640 
641 #else   /* !CONFIG_GENERIC_BUG */
642 
643 static inline void module_bug_finalize(const Elf_Ehdr *hdr,
644                                         const Elf_Shdr *sechdrs,
645                                         struct module *mod)
646 {
647 }
648 static inline void module_bug_cleanup(struct module *mod) {}
649 #endif  /* CONFIG_GENERIC_BUG */
650 
651 #endif /* _LINUX_MODULE_H */
652 

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