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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 module {
214         enum module_state state;
215 
216         /* Member of list of modules */
217         struct list_head list;
218 
219         /* Unique handle for this module */
220         char name[MODULE_NAME_LEN];
221 
222         /* Sysfs stuff. */
223         struct module_kobject mkobj;
224         struct module_attribute *modinfo_attrs;
225         const char *version;
226         const char *srcversion;
227         struct kobject *holders_dir;
228 
229         /* Exported symbols */
230         const struct kernel_symbol *syms;
231         const unsigned long *crcs;
232         unsigned int num_syms;
233 
234         /* Kernel parameters. */
235         struct kernel_param *kp;
236         unsigned int num_kp;
237 
238         /* GPL-only exported symbols. */
239         unsigned int num_gpl_syms;
240         const struct kernel_symbol *gpl_syms;
241         const unsigned long *gpl_crcs;
242 
243 #ifdef CONFIG_UNUSED_SYMBOLS
244         /* unused exported symbols. */
245         const struct kernel_symbol *unused_syms;
246         const unsigned long *unused_crcs;
247         unsigned int num_unused_syms;
248 
249         /* GPL-only, unused exported symbols. */
250         unsigned int num_unused_gpl_syms;
251         const struct kernel_symbol *unused_gpl_syms;
252         const unsigned long *unused_gpl_crcs;
253 #endif
254 
255 #ifdef CONFIG_MODULE_SIG
256         /* Signature was verified. */
257         bool sig_ok;
258 #endif
259 
260         /* symbols that will be GPL-only in the near future. */
261         const struct kernel_symbol *gpl_future_syms;
262         const unsigned long *gpl_future_crcs;
263         unsigned int num_gpl_future_syms;
264 
265         /* Exception table */
266         unsigned int num_exentries;
267         struct exception_table_entry *extable;
268 
269         /* Startup function. */
270         int (*init)(void);
271 
272         /* If this is non-NULL, vfree after init() returns */
273         void *module_init;
274 
275         /* Here is the actual code + data, vfree'd on unload. */
276         void *module_core;
277 
278         /* Here are the sizes of the init and core sections */
279         unsigned int init_size, core_size;
280 
281         /* The size of the executable code in each section.  */
282         unsigned int init_text_size, core_text_size;
283 
284         /* Size of RO sections of the module (text+rodata) */
285         unsigned int init_ro_size, core_ro_size;
286 
287         /* Arch-specific module values */
288         struct mod_arch_specific arch;
289 
290         unsigned int taints;    /* same bits as kernel:tainted */
291 
292 #ifdef CONFIG_GENERIC_BUG
293         /* Support for BUG */
294         unsigned num_bugs;
295         struct list_head bug_list;
296         struct bug_entry *bug_table;
297 #endif
298 
299 #ifdef CONFIG_KALLSYMS
300         /*
301          * We keep the symbol and string tables for kallsyms.
302          * The core_* fields below are temporary, loader-only (they
303          * could really be discarded after module init).
304          */
305         Elf_Sym *symtab, *core_symtab;
306         unsigned int num_symtab, core_num_syms;
307         char *strtab, *core_strtab;
308 
309         /* Section attributes */
310         struct module_sect_attrs *sect_attrs;
311 
312         /* Notes attributes */
313         struct module_notes_attrs *notes_attrs;
314 #endif
315 
316         /* The command line arguments (may be mangled).  People like
317            keeping pointers to this stuff */
318         char *args;
319 
320 #ifdef CONFIG_SMP
321         /* Per-cpu data. */
322         void __percpu *percpu;
323         unsigned int percpu_size;
324 #endif
325 
326 #ifdef CONFIG_TRACEPOINTS
327         unsigned int num_tracepoints;
328         struct tracepoint * const *tracepoints_ptrs;
329 #endif
330 #ifdef HAVE_JUMP_LABEL
331         struct jump_entry *jump_entries;
332         unsigned int num_jump_entries;
333 #endif
334 #ifdef CONFIG_TRACING
335         unsigned int num_trace_bprintk_fmt;
336         const char **trace_bprintk_fmt_start;
337 #endif
338 #ifdef CONFIG_EVENT_TRACING
339         struct ftrace_event_call **trace_events;
340         unsigned int num_trace_events;
341 #endif
342 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
343         unsigned int num_ftrace_callsites;
344         unsigned long *ftrace_callsites;
345 #endif
346 
347 #ifdef CONFIG_LIVEPATCH
348         bool klp_alive;
349 #endif
350 
351 #ifdef CONFIG_MODULE_UNLOAD
352         /* What modules depend on me? */
353         struct list_head source_list;
354         /* What modules do I depend on? */
355         struct list_head target_list;
356 
357         /* Destruction function. */
358         void (*exit)(void);
359 
360         atomic_t refcnt;
361 #endif
362 
363 #ifdef CONFIG_CONSTRUCTORS
364         /* Constructor functions. */
365         ctor_fn_t *ctors;
366         unsigned int num_ctors;
367 #endif
368 };
369 #ifndef MODULE_ARCH_INIT
370 #define MODULE_ARCH_INIT {}
371 #endif
372 
373 extern struct mutex module_mutex;
374 
375 /* FIXME: It'd be nice to isolate modules during init, too, so they
376    aren't used before they (may) fail.  But presently too much code
377    (IDE & SCSI) require entry into the module during init.*/
378 static inline int module_is_live(struct module *mod)
379 {
380         return mod->state != MODULE_STATE_GOING;
381 }
382 
383 struct module *__module_text_address(unsigned long addr);
384 struct module *__module_address(unsigned long addr);
385 bool is_module_address(unsigned long addr);
386 bool is_module_percpu_address(unsigned long addr);
387 bool is_module_text_address(unsigned long addr);
388 
389 static inline bool within_module_core(unsigned long addr,
390                                       const struct module *mod)
391 {
392         return (unsigned long)mod->module_core <= addr &&
393                addr < (unsigned long)mod->module_core + mod->core_size;
394 }
395 
396 static inline bool within_module_init(unsigned long addr,
397                                       const 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 static inline bool within_module(unsigned long addr, const struct module *mod)
404 {
405         return within_module_init(addr, mod) || within_module_core(addr, mod);
406 }
407 
408 /* Search for module by name: must hold module_mutex. */
409 struct module *find_module(const char *name);
410 
411 struct symsearch {
412         const struct kernel_symbol *start, *stop;
413         const unsigned long *crcs;
414         enum {
415                 NOT_GPL_ONLY,
416                 GPL_ONLY,
417                 WILL_BE_GPL_ONLY,
418         } licence;
419         bool unused;
420 };
421 
422 /* Search for an exported symbol by name. */
423 const struct kernel_symbol *find_symbol(const char *name,
424                                         struct module **owner,
425                                         const unsigned long **crc,
426                                         bool gplok,
427                                         bool warn);
428 
429 /* Walk the exported symbol table */
430 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
431                                     struct module *owner,
432                                     void *data), void *data);
433 
434 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
435    symnum out of range. */
436 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
437                         char *name, char *module_name, int *exported);
438 
439 /* Look for this name: can be of form module:name. */
440 unsigned long module_kallsyms_lookup_name(const char *name);
441 
442 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
443                                              struct module *, unsigned long),
444                                    void *data);
445 
446 extern void __module_put_and_exit(struct module *mod, long code)
447         __attribute__((noreturn));
448 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code)
449 
450 #ifdef CONFIG_MODULE_UNLOAD
451 int module_refcount(struct module *mod);
452 void __symbol_put(const char *symbol);
453 #define symbol_put(x) __symbol_put(VMLINUX_SYMBOL_STR(x))
454 void symbol_put_addr(void *addr);
455 
456 /* Sometimes we know we already have a refcount, and it's easier not
457    to handle the error case (which only happens with rmmod --wait). */
458 extern void __module_get(struct module *module);
459 
460 /* This is the Right Way to get a module: if it fails, it's being removed,
461  * so pretend it's not there. */
462 extern bool try_module_get(struct module *module);
463 
464 extern void module_put(struct module *module);
465 
466 #else /*!CONFIG_MODULE_UNLOAD*/
467 static inline int try_module_get(struct module *module)
468 {
469         return !module || module_is_live(module);
470 }
471 static inline void module_put(struct module *module)
472 {
473 }
474 static inline void __module_get(struct module *module)
475 {
476 }
477 #define symbol_put(x) do { } while (0)
478 #define symbol_put_addr(p) do { } while (0)
479 
480 #endif /* CONFIG_MODULE_UNLOAD */
481 int ref_module(struct module *a, struct module *b);
482 
483 /* This is a #define so the string doesn't get put in every .o file */
484 #define module_name(mod)                        \
485 ({                                              \
486         struct module *__mod = (mod);           \
487         __mod ? __mod->name : "kernel";         \
488 })
489 
490 /* For kallsyms to ask for address resolution.  namebuf should be at
491  * least KSYM_NAME_LEN long: a pointer to namebuf is returned if
492  * found, otherwise NULL. */
493 const char *module_address_lookup(unsigned long addr,
494                             unsigned long *symbolsize,
495                             unsigned long *offset,
496                             char **modname,
497                             char *namebuf);
498 int lookup_module_symbol_name(unsigned long addr, char *symname);
499 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
500 
501 /* For extable.c to search modules' exception tables. */
502 const struct exception_table_entry *search_module_extables(unsigned long addr);
503 
504 int register_module_notifier(struct notifier_block *nb);
505 int unregister_module_notifier(struct notifier_block *nb);
506 
507 extern void print_modules(void);
508 
509 #else /* !CONFIG_MODULES... */
510 
511 /* Given an address, look for it in the exception tables. */
512 static inline const struct exception_table_entry *
513 search_module_extables(unsigned long addr)
514 {
515         return NULL;
516 }
517 
518 static inline struct module *__module_address(unsigned long addr)
519 {
520         return NULL;
521 }
522 
523 static inline struct module *__module_text_address(unsigned long addr)
524 {
525         return NULL;
526 }
527 
528 static inline bool is_module_address(unsigned long addr)
529 {
530         return false;
531 }
532 
533 static inline bool is_module_percpu_address(unsigned long addr)
534 {
535         return false;
536 }
537 
538 static inline bool is_module_text_address(unsigned long addr)
539 {
540         return false;
541 }
542 
543 /* Get/put a kernel symbol (calls should be symmetric) */
544 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
545 #define symbol_put(x) do { } while (0)
546 #define symbol_put_addr(x) do { } while (0)
547 
548 static inline void __module_get(struct module *module)
549 {
550 }
551 
552 static inline int try_module_get(struct module *module)
553 {
554         return 1;
555 }
556 
557 static inline void module_put(struct module *module)
558 {
559 }
560 
561 #define module_name(mod) "kernel"
562 
563 /* For kallsyms to ask for address resolution.  NULL means not found. */
564 static inline const char *module_address_lookup(unsigned long addr,
565                                           unsigned long *symbolsize,
566                                           unsigned long *offset,
567                                           char **modname,
568                                           char *namebuf)
569 {
570         return NULL;
571 }
572 
573 static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
574 {
575         return -ERANGE;
576 }
577 
578 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
579 {
580         return -ERANGE;
581 }
582 
583 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
584                                         char *type, char *name,
585                                         char *module_name, int *exported)
586 {
587         return -ERANGE;
588 }
589 
590 static inline unsigned long module_kallsyms_lookup_name(const char *name)
591 {
592         return 0;
593 }
594 
595 static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
596                                                            struct module *,
597                                                            unsigned long),
598                                                  void *data)
599 {
600         return 0;
601 }
602 
603 static inline int register_module_notifier(struct notifier_block *nb)
604 {
605         /* no events will happen anyway, so this can always succeed */
606         return 0;
607 }
608 
609 static inline int unregister_module_notifier(struct notifier_block *nb)
610 {
611         return 0;
612 }
613 
614 #define module_put_and_exit(code) do_exit(code)
615 
616 static inline void print_modules(void)
617 {
618 }
619 #endif /* CONFIG_MODULES */
620 
621 #ifdef CONFIG_SYSFS
622 extern struct kset *module_kset;
623 extern struct kobj_type module_ktype;
624 extern int module_sysfs_initialized;
625 #endif /* CONFIG_SYSFS */
626 
627 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
628 
629 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
630 
631 #define __MODULE_STRING(x) __stringify(x)
632 
633 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
634 extern void set_all_modules_text_rw(void);
635 extern void set_all_modules_text_ro(void);
636 #else
637 static inline void set_all_modules_text_rw(void) { }
638 static inline void set_all_modules_text_ro(void) { }
639 #endif
640 
641 #ifdef CONFIG_GENERIC_BUG
642 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
643                          struct module *);
644 void module_bug_cleanup(struct module *);
645 
646 #else   /* !CONFIG_GENERIC_BUG */
647 
648 static inline void module_bug_finalize(const Elf_Ehdr *hdr,
649                                         const Elf_Shdr *sechdrs,
650                                         struct module *mod)
651 {
652 }
653 static inline void module_bug_cleanup(struct module *mod) {}
654 #endif  /* CONFIG_GENERIC_BUG */
655 
656 #endif /* _LINUX_MODULE_H */
657 

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