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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 /* 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 {
 34         unsigned long crc;
 35         char name[MODULE_NAME_LEN];
 36 };
 37 
 38 struct module;
 39 
 40 struct module_kobject {
 41         struct kobject kobj;
 42         struct module *mod;
 43         struct kobject *drivers_dir;
 44         struct module_param_attrs *mp;
 45         struct completion *kobj_completion;
 46 };
 47 
 48 struct module_attribute {
 49         struct attribute attr;
 50         ssize_t (*show)(struct module_attribute *, struct module_kobject *,
 51                         char *);
 52         ssize_t (*store)(struct module_attribute *, struct module_kobject *,
 53                          const char *, size_t count);
 54         void (*setup)(struct module *, const char *);
 55         int (*test)(struct module *);
 56         void (*free)(struct module *);
 57 };
 58 
 59 struct module_version_attribute {
 60         struct module_attribute mattr;
 61         const char *module_name;
 62         const char *version;
 63 } __attribute__ ((__aligned__(sizeof(void *))));
 64 
 65 extern ssize_t __modver_version_show(struct module_attribute *,
 66                                      struct module_kobject *, char *);
 67 
 68 extern struct module_attribute module_uevent;
 69 
 70 /* These are either module local, or the kernel's dummy ones. */
 71 extern int init_module(void);
 72 extern void cleanup_module(void);
 73 
 74 /* Archs provide a method of finding the correct exception table. */
 75 struct exception_table_entry;
 76 
 77 const struct exception_table_entry *
 78 search_extable(const struct exception_table_entry *first,
 79                const struct exception_table_entry *last,
 80                unsigned long value);
 81 void sort_extable(struct exception_table_entry *start,
 82                   struct exception_table_entry *finish);
 83 void sort_main_extable(void);
 84 void trim_init_extable(struct module *m);
 85 
 86 /* Generic info of form tag = "info" */
 87 #define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
 88 
 89 /* For userspace: you can also call me... */
 90 #define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
 91 
 92 /* Soft module dependencies. See man modprobe.d for details.
 93  * Example: MODULE_SOFTDEP("pre: module-foo module-bar post: module-baz")
 94  */
 95 #define MODULE_SOFTDEP(_softdep) MODULE_INFO(softdep, _softdep)
 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 #ifdef MODULE
137 /* Creates an alias so file2alias.c can find device table. */
138 #define MODULE_DEVICE_TABLE(type, name)                                 \
139   extern const struct type##_device_id __mod_##type##__##name##_device_table \
140   __attribute__ ((unused, alias(__stringify(name))))
141 #else  /* !MODULE */
142 #define MODULE_DEVICE_TABLE(type, name)
143 #endif
144 
145 /* Version of form [<epoch>:]<version>[-<extra-version>].
146    Or for CVS/RCS ID version, everything but the number is stripped.
147   <epoch>: A (small) unsigned integer which allows you to start versions
148            anew. If not mentioned, it's zero.  eg. "2:1.0" is after
149            "1:2.0".
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   <extraversion>: Like <version>, but inserted for local
154            customizations, eg "rh3" or "rusty1".
155 
156   Using this automatically adds a checksum of the .c files and the
157   local headers in "srcversion".
158 */
159 
160 #if defined(MODULE) || !defined(CONFIG_SYSFS)
161 #define MODULE_VERSION(_version) MODULE_INFO(version, _version)
162 #else
163 #define MODULE_VERSION(_version)                                        \
164         static struct module_version_attribute ___modver_attr = {       \
165                 .mattr  = {                                             \
166                         .attr   = {                                     \
167                                 .name   = "version",                    \
168                                 .mode   = S_IRUGO,                      \
169                         },                                              \
170                         .show   = __modver_version_show,                \
171                 },                                                      \
172                 .module_name    = KBUILD_MODNAME,                       \
173                 .version        = _version,                             \
174         };                                                              \
175         static const struct module_version_attribute                    \
176         __used __attribute__ ((__section__ ("__modver")))               \
177         * __moduleparam_const __modver_attr = &___modver_attr
178 #endif
179 
180 /* Optional firmware file (or files) needed by the module
181  * format is simply firmware file name.  Multiple firmware
182  * files require multiple MODULE_FIRMWARE() specifiers */
183 #define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
184 
185 /* Given an address, look for it in the exception tables */
186 const struct exception_table_entry *search_exception_tables(unsigned long add);
187 
188 struct notifier_block;
189 
190 #ifdef CONFIG_MODULES
191 
192 extern int modules_disabled; /* for sysctl */
193 /* Get/put a kernel symbol (calls must be symmetric) */
194 void *__symbol_get(const char *symbol);
195 void *__symbol_get_gpl(const char *symbol);
196 #define symbol_get(x) ((typeof(&x))(__symbol_get(VMLINUX_SYMBOL_STR(x))))
197 
198 /* modules using other modules: kdb wants to see this. */
199 struct module_use {
200         struct list_head source_list;
201         struct list_head target_list;
202         struct module *source, *target;
203 };
204 
205 enum module_state {
206         MODULE_STATE_LIVE,      /* Normal state. */
207         MODULE_STATE_COMING,    /* Full formed, running module_init. */
208         MODULE_STATE_GOING,     /* Going away. */
209         MODULE_STATE_UNFORMED,  /* Still setting it up. */
210 };
211 
212 /**
213  * struct module_ref - per cpu module reference counts
214  * @incs: number of module get on this cpu
215  * @decs: number of module put on this cpu
216  *
217  * We force an alignment on 8 or 16 bytes, so that alloc_percpu()
218  * put @incs/@decs in same cache line, with no extra memory cost,
219  * since alloc_percpu() is fine grained.
220  */
221 struct module_ref {
222         unsigned long incs;
223         unsigned long decs;
224 } __attribute((aligned(2 * sizeof(unsigned long))));
225 
226 struct mod_kallsyms {
227         Elf_Sym *symtab;
228         unsigned int num_symtab;
229         char *strtab;
230 };
231 
232 struct module
233 {
234         enum module_state state;
235 
236         /* Member of list of modules */
237         struct list_head list;
238 
239         /* Unique handle for this module */
240         char name[MODULE_NAME_LEN];
241 
242         /* Sysfs stuff. */
243         struct module_kobject mkobj;
244         struct module_attribute *modinfo_attrs;
245         const char *version;
246         const char *srcversion;
247         struct kobject *holders_dir;
248 
249         /* Exported symbols */
250         const struct kernel_symbol *syms;
251         const unsigned long *crcs;
252         unsigned int num_syms;
253 
254         /* Kernel parameters. */
255         struct kernel_param *kp;
256         unsigned int num_kp;
257 
258         /* GPL-only exported symbols. */
259         unsigned int num_gpl_syms;
260         const struct kernel_symbol *gpl_syms;
261         const unsigned long *gpl_crcs;
262 
263 #ifdef CONFIG_UNUSED_SYMBOLS
264         /* unused exported symbols. */
265         const struct kernel_symbol *unused_syms;
266         const unsigned long *unused_crcs;
267         unsigned int num_unused_syms;
268 
269         /* GPL-only, unused exported symbols. */
270         unsigned int num_unused_gpl_syms;
271         const struct kernel_symbol *unused_gpl_syms;
272         const unsigned long *unused_gpl_crcs;
273 #endif
274 
275 #ifdef CONFIG_MODULE_SIG
276         /* Signature was verified. */
277         bool sig_ok;
278 #endif
279 
280         /* symbols that will be GPL-only in the near future. */
281         const struct kernel_symbol *gpl_future_syms;
282         const unsigned long *gpl_future_crcs;
283         unsigned int num_gpl_future_syms;
284 
285         /* Exception table */
286         unsigned int num_exentries;
287         struct exception_table_entry *extable;
288 
289         /* Startup function. */
290         int (*init)(void);
291 
292         /* If this is non-NULL, vfree after init() returns */
293         void *module_init;
294 
295         /* Here is the actual code + data, vfree'd on unload. */
296         void *module_core;
297 
298         /* Here are the sizes of the init and core sections */
299         unsigned int init_size, core_size;
300 
301         /* The size of the executable code in each section.  */
302         unsigned int init_text_size, core_text_size;
303 
304         /* Size of RO sections of the module (text+rodata) */
305         unsigned int init_ro_size, core_ro_size;
306 
307         /* Arch-specific module values */
308         struct mod_arch_specific arch;
309 
310         unsigned int taints;    /* same bits as kernel:tainted */
311 
312 #ifdef CONFIG_GENERIC_BUG
313         /* Support for BUG */
314         unsigned num_bugs;
315         struct list_head bug_list;
316         struct bug_entry *bug_table;
317 #endif
318 
319 #ifdef CONFIG_KALLSYMS
320         /* Protected by RCU and/or module_mutex: use rcu_dereference() */
321         struct mod_kallsyms *kallsyms;
322         struct mod_kallsyms core_kallsyms;
323 
324         /* Section attributes */
325         struct module_sect_attrs *sect_attrs;
326 
327         /* Notes attributes */
328         struct module_notes_attrs *notes_attrs;
329 #endif
330 
331         /* The command line arguments (may be mangled).  People like
332            keeping pointers to this stuff */
333         char *args;
334 
335 #ifdef CONFIG_SMP
336         /* Per-cpu data. */
337         void __percpu *percpu;
338         unsigned int percpu_size;
339 #endif
340 
341 #ifdef CONFIG_TRACEPOINTS
342         unsigned int num_tracepoints;
343         struct tracepoint * const *tracepoints_ptrs;
344 #endif
345 #ifdef HAVE_JUMP_LABEL
346         struct jump_entry *jump_entries;
347         unsigned int num_jump_entries;
348 #endif
349 #ifdef CONFIG_TRACING
350         unsigned int num_trace_bprintk_fmt;
351         const char **trace_bprintk_fmt_start;
352 #endif
353 #ifdef CONFIG_EVENT_TRACING
354         struct ftrace_event_call **trace_events;
355         unsigned int num_trace_events;
356 #endif
357 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
358         unsigned int num_ftrace_callsites;
359         unsigned long *ftrace_callsites;
360 #endif
361 
362 #ifdef CONFIG_MODULE_UNLOAD
363         /* What modules depend on me? */
364         struct list_head source_list;
365         /* What modules do I depend on? */
366         struct list_head target_list;
367 
368         /* Who is waiting for us to be unloaded */
369         struct task_struct *waiter;
370 
371         /* Destruction function. */
372         void (*exit)(void);
373 
374         struct module_ref __percpu *refptr;
375 #endif
376 
377 #ifdef CONFIG_CONSTRUCTORS
378         /* Constructor functions. */
379         ctor_fn_t *ctors;
380         unsigned int num_ctors;
381 #endif
382 };
383 #ifndef MODULE_ARCH_INIT
384 #define MODULE_ARCH_INIT {}
385 #endif
386 
387 extern struct mutex module_mutex;
388 
389 /* FIXME: It'd be nice to isolate modules during init, too, so they
390    aren't used before they (may) fail.  But presently too much code
391    (IDE & SCSI) require entry into the module during init.*/
392 static inline int module_is_live(struct module *mod)
393 {
394         return mod->state != MODULE_STATE_GOING;
395 }
396 
397 struct module *__module_text_address(unsigned long addr);
398 struct module *__module_address(unsigned long addr);
399 bool is_module_address(unsigned long addr);
400 bool is_module_percpu_address(unsigned long addr);
401 bool is_module_text_address(unsigned long addr);
402 
403 static inline int within_module_core(unsigned long addr, const struct module *mod)
404 {
405         return (unsigned long)mod->module_core <= addr &&
406                addr < (unsigned long)mod->module_core + mod->core_size;
407 }
408 
409 static inline int within_module_init(unsigned long addr, const struct module *mod)
410 {
411         return (unsigned long)mod->module_init <= addr &&
412                addr < (unsigned long)mod->module_init + mod->init_size;
413 }
414 
415 /* Search for module by name: must hold module_mutex. */
416 struct module *find_module(const char *name);
417 
418 struct symsearch {
419         const struct kernel_symbol *start, *stop;
420         const unsigned long *crcs;
421         enum {
422                 NOT_GPL_ONLY,
423                 GPL_ONLY,
424                 WILL_BE_GPL_ONLY,
425         } licence;
426         bool unused;
427 };
428 
429 /* Search for an exported symbol by name. */
430 const struct kernel_symbol *find_symbol(const char *name,
431                                         struct module **owner,
432                                         const unsigned long **crc,
433                                         bool gplok,
434                                         bool warn);
435 
436 /* Walk the exported symbol table */
437 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
438                                     struct module *owner,
439                                     void *data), void *data);
440 
441 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
442    symnum out of range. */
443 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
444                         char *name, char *module_name, int *exported);
445 
446 /* Look for this name: can be of form module:name. */
447 unsigned long module_kallsyms_lookup_name(const char *name);
448 
449 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
450                                              struct module *, unsigned long),
451                                    void *data);
452 
453 extern void __module_put_and_exit(struct module *mod, long code)
454         __attribute__((noreturn));
455 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code);
456 
457 #ifdef CONFIG_MODULE_UNLOAD
458 unsigned long module_refcount(struct module *mod);
459 void __symbol_put(const char *symbol);
460 #define symbol_put(x) __symbol_put(VMLINUX_SYMBOL_STR(x))
461 void symbol_put_addr(void *addr);
462 
463 /* Sometimes we know we already have a refcount, and it's easier not
464    to handle the error case (which only happens with rmmod --wait). */
465 extern void __module_get(struct module *module);
466 
467 /* This is the Right Way to get a module: if it fails, it's being removed,
468  * so pretend it's not there. */
469 extern bool try_module_get(struct module *module);
470 
471 extern void module_put(struct module *module);
472 
473 #else /*!CONFIG_MODULE_UNLOAD*/
474 static inline int try_module_get(struct module *module)
475 {
476         return !module || module_is_live(module);
477 }
478 static inline void module_put(struct module *module)
479 {
480 }
481 static inline void __module_get(struct module *module)
482 {
483 }
484 #define symbol_put(x) do { } while(0)
485 #define symbol_put_addr(p) do { } while(0)
486 
487 #endif /* CONFIG_MODULE_UNLOAD */
488 int ref_module(struct module *a, struct module *b);
489 
490 /* This is a #define so the string doesn't get put in every .o file */
491 #define module_name(mod)                        \
492 ({                                              \
493         struct module *__mod = (mod);           \
494         __mod ? __mod->name : "kernel";         \
495 })
496 
497 /* For kallsyms to ask for address resolution.  namebuf should be at
498  * least KSYM_NAME_LEN long: a pointer to namebuf is returned if
499  * found, otherwise NULL. */
500 const char *module_address_lookup(unsigned long addr,
501                             unsigned long *symbolsize,
502                             unsigned long *offset,
503                             char **modname,
504                             char *namebuf);
505 int lookup_module_symbol_name(unsigned long addr, char *symname);
506 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
507 
508 /* For extable.c to search modules' exception tables. */
509 const struct exception_table_entry *search_module_extables(unsigned long addr);
510 
511 int register_module_notifier(struct notifier_block * nb);
512 int unregister_module_notifier(struct notifier_block * nb);
513 
514 extern void print_modules(void);
515 
516 #else /* !CONFIG_MODULES... */
517 
518 /* Given an address, look for it in the exception tables. */
519 static inline const struct exception_table_entry *
520 search_module_extables(unsigned long addr)
521 {
522         return NULL;
523 }
524 
525 static inline struct module *__module_address(unsigned long addr)
526 {
527         return NULL;
528 }
529 
530 static inline struct module *__module_text_address(unsigned long addr)
531 {
532         return NULL;
533 }
534 
535 static inline bool is_module_address(unsigned long addr)
536 {
537         return false;
538 }
539 
540 static inline bool is_module_percpu_address(unsigned long addr)
541 {
542         return false;
543 }
544 
545 static inline bool is_module_text_address(unsigned long addr)
546 {
547         return false;
548 }
549 
550 /* Get/put a kernel symbol (calls should be symmetric) */
551 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
552 #define symbol_put(x) do { } while(0)
553 #define symbol_put_addr(x) do { } while(0)
554 
555 static inline void __module_get(struct module *module)
556 {
557 }
558 
559 static inline int try_module_get(struct module *module)
560 {
561         return 1;
562 }
563 
564 static inline void module_put(struct module *module)
565 {
566 }
567 
568 #define module_name(mod) "kernel"
569 
570 /* For kallsyms to ask for address resolution.  NULL means not found. */
571 static inline const char *module_address_lookup(unsigned long addr,
572                                           unsigned long *symbolsize,
573                                           unsigned long *offset,
574                                           char **modname,
575                                           char *namebuf)
576 {
577         return NULL;
578 }
579 
580 static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
581 {
582         return -ERANGE;
583 }
584 
585 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
586 {
587         return -ERANGE;
588 }
589 
590 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
591                                         char *type, char *name,
592                                         char *module_name, int *exported)
593 {
594         return -ERANGE;
595 }
596 
597 static inline unsigned long module_kallsyms_lookup_name(const char *name)
598 {
599         return 0;
600 }
601 
602 static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
603                                                            struct module *,
604                                                            unsigned long),
605                                                  void *data)
606 {
607         return 0;
608 }
609 
610 static inline int register_module_notifier(struct notifier_block * nb)
611 {
612         /* no events will happen anyway, so this can always succeed */
613         return 0;
614 }
615 
616 static inline int unregister_module_notifier(struct notifier_block * nb)
617 {
618         return 0;
619 }
620 
621 #define module_put_and_exit(code) do_exit(code)
622 
623 static inline void print_modules(void)
624 {
625 }
626 #endif /* CONFIG_MODULES */
627 
628 #ifdef CONFIG_SYSFS
629 extern struct kset *module_kset;
630 extern struct kobj_type module_ktype;
631 extern int module_sysfs_initialized;
632 #endif /* CONFIG_SYSFS */
633 
634 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
635 
636 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
637 
638 #define __MODULE_STRING(x) __stringify(x)
639 
640 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
641 extern void set_all_modules_text_rw(void);
642 extern void set_all_modules_text_ro(void);
643 #else
644 static inline void set_all_modules_text_rw(void) { }
645 static inline void set_all_modules_text_ro(void) { }
646 #endif
647 
648 #ifdef CONFIG_GENERIC_BUG
649 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
650                          struct module *);
651 void module_bug_cleanup(struct module *);
652 
653 #else   /* !CONFIG_GENERIC_BUG */
654 
655 static inline void module_bug_finalize(const Elf_Ehdr *hdr,
656                                         const Elf_Shdr *sechdrs,
657                                         struct module *mod)
658 {
659 }
660 static inline void module_bug_cleanup(struct module *mod) {}
661 #endif  /* CONFIG_GENERIC_BUG */
662 
663 #endif /* _LINUX_MODULE_H */
664 

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