1 #ifndef _LINUX_MODULE_H
2 #define _LINUX_MODULE_H
4 * Dynamic loading of modules into the kernel.
6 * Rewritten by Richard Henderson <rth@tamu.edu> Dec 1996
7 * Rewritten again by Rusty Russell, 2002
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>
21 #include <linux/percpu.h>
22 #include <asm/module.h>
24 #include <trace/events/module.h>
26 /* Not Yet Implemented */
27 #define MODULE_SUPPORTED_DEVICE(name)
29 #define MODULE_NAME_LEN MAX_PARAM_PREFIX_LEN
31 struct modversion_info
34 char name[MODULE_NAME_LEN];
39 struct module_attribute {
40 struct attribute attr;
41 ssize_t (*show)(struct module_attribute *, struct module *, char *);
42 ssize_t (*store)(struct module_attribute *, struct module *,
43 const char *, size_t count);
44 void (*setup)(struct module *, const char *);
45 int (*test)(struct module *);
46 void (*free)(struct module *);
49 struct module_version_attribute {
50 struct module_attribute mattr;
51 const char *module_name;
53 } __attribute__ ((__aligned__(sizeof(void *))));
55 extern ssize_t __modver_version_show(struct module_attribute *,
56 struct module *, char *);
62 struct kobject *drivers_dir;
63 struct module_param_attrs *mp;
66 /* These are either module local, or the kernel's dummy ones. */
67 extern int init_module(void);
68 extern void cleanup_module(void);
70 /* Archs provide a method of finding the correct exception table. */
71 struct exception_table_entry;
73 const struct exception_table_entry *
74 search_extable(const struct exception_table_entry *first,
75 const struct exception_table_entry *last,
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);
83 #define MODULE_GENERIC_TABLE(gtype,name) \
84 extern const struct gtype##_id __mod_##gtype##_table \
85 __attribute__ ((unused, alias(__stringify(name))))
88 #define MODULE_GENERIC_TABLE(gtype,name)
91 /* Generic info of form tag = "info" */
92 #define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
94 /* For userspace: you can also call me... */
95 #define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
98 * The following license idents are currently accepted as indicating free
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]
111 * The following other idents are available
113 * "Proprietary" [Non free products]
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.
119 * This exists for several reasons
120 * 1. So modinfo can show license info for users wanting to vet their setup
122 * 2. So the community can ignore bug reports including proprietary modules
123 * 3. So vendors can do likewise based on their own policies
125 #define MODULE_LICENSE(_license) MODULE_INFO(license, _license)
128 * Author(s), use "Name <email>" or just "Name", for multiple
129 * authors use multiple MODULE_AUTHOR() statements/lines.
131 #define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
133 /* What your module does. */
134 #define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
136 /* One for each parameter, describing how to use it. Some files do
137 multiple of these per line, so can't just use MODULE_INFO. */
138 #define MODULE_PARM_DESC(_parm, desc) \
139 __MODULE_INFO(parm, _parm, #_parm ":" desc)
141 #define MODULE_DEVICE_TABLE(type,name) \
142 MODULE_GENERIC_TABLE(type##_device,name)
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
149 <version>: The <version> may contain only alphanumerics and the
150 character `.'. Ordered by numeric sort for numeric parts,
151 ascii sort for ascii parts (as per RPM or DEB algorithm).
152 <extraversion>: Like <version>, but inserted for local
153 customizations, eg "rh3" or "rusty1".
155 Using this automatically adds a checksum of the .c files and the
156 local headers in "srcversion".
159 #if defined(MODULE) || !defined(CONFIG_SYSFS)
160 #define MODULE_VERSION(_version) MODULE_INFO(version, _version)
162 #define MODULE_VERSION(_version) \
163 static struct module_version_attribute ___modver_attr = { \
169 .show = __modver_version_show, \
171 .module_name = KBUILD_MODNAME, \
172 .version = _version, \
174 static const struct module_version_attribute \
175 __used __attribute__ ((__section__ ("__modver"))) \
176 * __moduleparam_const __modver_attr = &___modver_attr
179 /* Optional firmware file (or files) needed by the module
180 * format is simply firmware file name. Multiple firmware
181 * files require multiple MODULE_FIRMWARE() specifiers */
182 #define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
184 /* Given an address, look for it in the exception tables */
185 const struct exception_table_entry *search_exception_tables(unsigned long add);
187 struct notifier_block;
189 #ifdef CONFIG_MODULES
191 extern int modules_disabled; /* for sysctl */
192 /* Get/put a kernel symbol (calls must be symmetric) */
193 void *__symbol_get(const char *symbol);
194 void *__symbol_get_gpl(const char *symbol);
195 #define symbol_get(x) ((typeof(&x))(__symbol_get(MODULE_SYMBOL_PREFIX #x)))
197 /* modules using other modules: kdb wants to see this. */
199 struct list_head source_list;
200 struct list_head target_list;
201 struct module *source, *target;
213 enum module_state state;
215 /* Member of list of modules */
216 struct list_head list;
218 /* Unique handle for this module */
219 char name[MODULE_NAME_LEN];
222 struct module_kobject mkobj;
223 struct module_attribute *modinfo_attrs;
225 const char *srcversion;
226 struct kobject *holders_dir;
228 /* Exported symbols */
229 const struct kernel_symbol *syms;
230 const unsigned long *crcs;
231 unsigned int num_syms;
233 /* Kernel parameters. */
234 struct kernel_param *kp;
237 /* GPL-only exported symbols. */
238 unsigned int num_gpl_syms;
239 const struct kernel_symbol *gpl_syms;
240 const unsigned long *gpl_crcs;
242 #ifdef CONFIG_UNUSED_SYMBOLS
243 /* unused exported symbols. */
244 const struct kernel_symbol *unused_syms;
245 const unsigned long *unused_crcs;
246 unsigned int num_unused_syms;
248 /* GPL-only, unused exported symbols. */
249 unsigned int num_unused_gpl_syms;
250 const struct kernel_symbol *unused_gpl_syms;
251 const unsigned long *unused_gpl_crcs;
254 /* symbols that will be GPL-only in the near future. */
255 const struct kernel_symbol *gpl_future_syms;
256 const unsigned long *gpl_future_crcs;
257 unsigned int num_gpl_future_syms;
259 /* Exception table */
260 unsigned int num_exentries;
261 struct exception_table_entry *extable;
263 /* Startup function. */
266 /* If this is non-NULL, vfree after init() returns */
269 /* Here is the actual code + data, vfree'd on unload. */
272 /* Here are the sizes of the init and core sections */
273 unsigned int init_size, core_size;
275 /* The size of the executable code in each section. */
276 unsigned int init_text_size, core_text_size;
278 /* Size of RO sections of the module (text+rodata) */
279 unsigned int init_ro_size, core_ro_size;
281 /* Arch-specific module values */
282 struct mod_arch_specific arch;
284 unsigned int taints; /* same bits as kernel:tainted */
286 #ifdef CONFIG_GENERIC_BUG
287 /* Support for BUG */
289 struct list_head bug_list;
290 struct bug_entry *bug_table;
293 #ifdef CONFIG_KALLSYMS
295 * We keep the symbol and string tables for kallsyms.
296 * The core_* fields below are temporary, loader-only (they
297 * could really be discarded after module init).
299 Elf_Sym *symtab, *core_symtab;
300 unsigned int num_symtab, core_num_syms;
301 char *strtab, *core_strtab;
303 /* Section attributes */
304 struct module_sect_attrs *sect_attrs;
306 /* Notes attributes */
307 struct module_notes_attrs *notes_attrs;
310 /* The command line arguments (may be mangled). People like
311 keeping pointers to this stuff */
316 void __percpu *percpu;
317 unsigned int percpu_size;
320 #ifdef CONFIG_TRACEPOINTS
321 unsigned int num_tracepoints;
322 struct tracepoint * const *tracepoints_ptrs;
324 #ifdef HAVE_JUMP_LABEL
325 struct jump_entry *jump_entries;
326 unsigned int num_jump_entries;
328 #ifdef CONFIG_TRACING
329 unsigned int num_trace_bprintk_fmt;
330 const char **trace_bprintk_fmt_start;
332 #ifdef CONFIG_EVENT_TRACING
333 struct ftrace_event_call **trace_events;
334 unsigned int num_trace_events;
336 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
337 unsigned int num_ftrace_callsites;
338 unsigned long *ftrace_callsites;
341 #ifdef CONFIG_MODULE_UNLOAD
342 /* What modules depend on me? */
343 struct list_head source_list;
344 /* What modules do I depend on? */
345 struct list_head target_list;
347 /* Who is waiting for us to be unloaded */
348 struct task_struct *waiter;
350 /* Destruction function. */
359 #ifdef CONFIG_CONSTRUCTORS
360 /* Constructor functions. */
362 unsigned int num_ctors;
365 #ifndef MODULE_ARCH_INIT
366 #define MODULE_ARCH_INIT {}
369 extern struct mutex module_mutex;
371 /* FIXME: It'd be nice to isolate modules during init, too, so they
372 aren't used before they (may) fail. But presently too much code
373 (IDE & SCSI) require entry into the module during init.*/
374 static inline int module_is_live(struct module *mod)
376 return mod->state != MODULE_STATE_GOING;
379 struct module *__module_text_address(unsigned long addr);
380 struct module *__module_address(unsigned long addr);
381 bool is_module_address(unsigned long addr);
382 bool is_module_percpu_address(unsigned long addr);
383 bool is_module_text_address(unsigned long addr);
385 static inline int within_module_core(unsigned long addr, struct module *mod)
387 return (unsigned long)mod->module_core <= addr &&
388 addr < (unsigned long)mod->module_core + mod->core_size;
391 static inline int within_module_init(unsigned long addr, struct module *mod)
393 return (unsigned long)mod->module_init <= addr &&
394 addr < (unsigned long)mod->module_init + mod->init_size;
397 /* Search for module by name: must hold module_mutex. */
398 struct module *find_module(const char *name);
401 const struct kernel_symbol *start, *stop;
402 const unsigned long *crcs;
411 /* Search for an exported symbol by name. */
412 const struct kernel_symbol *find_symbol(const char *name,
413 struct module **owner,
414 const unsigned long **crc,
418 /* Walk the exported symbol table */
419 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
420 struct module *owner,
421 void *data), void *data);
423 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
424 symnum out of range. */
425 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
426 char *name, char *module_name, int *exported);
428 /* Look for this name: can be of form module:name. */
429 unsigned long module_kallsyms_lookup_name(const char *name);
431 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
432 struct module *, unsigned long),
435 extern void __module_put_and_exit(struct module *mod, long code)
436 __attribute__((noreturn));
437 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code);
439 #ifdef CONFIG_MODULE_UNLOAD
440 unsigned int module_refcount(struct module *mod);
441 void __symbol_put(const char *symbol);
442 #define symbol_put(x) __symbol_put(MODULE_SYMBOL_PREFIX #x)
443 void symbol_put_addr(void *addr);
445 /* Sometimes we know we already have a refcount, and it's easier not
446 to handle the error case (which only happens with rmmod --wait). */
447 static inline void __module_get(struct module *module)
451 __this_cpu_inc(module->refptr->incs);
452 trace_module_get(module, _THIS_IP_);
457 static inline int try_module_get(struct module *module)
464 if (likely(module_is_live(module))) {
465 __this_cpu_inc(module->refptr->incs);
466 trace_module_get(module, _THIS_IP_);
475 extern void module_put(struct module *module);
477 #else /*!CONFIG_MODULE_UNLOAD*/
478 static inline int try_module_get(struct module *module)
480 return !module || module_is_live(module);
482 static inline void module_put(struct module *module)
485 static inline void __module_get(struct module *module)
488 #define symbol_put(x) do { } while(0)
489 #define symbol_put_addr(p) do { } while(0)
491 #endif /* CONFIG_MODULE_UNLOAD */
492 int ref_module(struct module *a, struct module *b);
494 /* This is a #define so the string doesn't get put in every .o file */
495 #define module_name(mod) \
497 struct module *__mod = (mod); \
498 __mod ? __mod->name : "kernel"; \
501 /* For kallsyms to ask for address resolution. namebuf should be at
502 * least KSYM_NAME_LEN long: a pointer to namebuf is returned if
503 * found, otherwise NULL. */
504 const char *module_address_lookup(unsigned long addr,
505 unsigned long *symbolsize,
506 unsigned long *offset,
509 int lookup_module_symbol_name(unsigned long addr, char *symname);
510 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
512 /* For extable.c to search modules' exception tables. */
513 const struct exception_table_entry *search_module_extables(unsigned long addr);
515 int register_module_notifier(struct notifier_block * nb);
516 int unregister_module_notifier(struct notifier_block * nb);
518 extern void print_modules(void);
520 extern void module_update_tracepoints(void);
521 extern int module_get_iter_tracepoints(struct tracepoint_iter *iter);
523 #else /* !CONFIG_MODULES... */
525 /* Given an address, look for it in the exception tables. */
526 static inline const struct exception_table_entry *
527 search_module_extables(unsigned long addr)
532 static inline struct module *__module_address(unsigned long addr)
537 static inline struct module *__module_text_address(unsigned long addr)
542 static inline bool is_module_address(unsigned long addr)
547 static inline bool is_module_percpu_address(unsigned long addr)
552 static inline bool is_module_text_address(unsigned long addr)
557 /* Get/put a kernel symbol (calls should be symmetric) */
558 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
559 #define symbol_put(x) do { } while(0)
560 #define symbol_put_addr(x) do { } while(0)
562 static inline void __module_get(struct module *module)
566 static inline int try_module_get(struct module *module)
571 static inline void module_put(struct module *module)
575 #define module_name(mod) "kernel"
577 /* For kallsyms to ask for address resolution. NULL means not found. */
578 static inline const char *module_address_lookup(unsigned long addr,
579 unsigned long *symbolsize,
580 unsigned long *offset,
587 static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
592 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
597 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
598 char *type, char *name,
599 char *module_name, int *exported)
604 static inline unsigned long module_kallsyms_lookup_name(const char *name)
609 static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
617 static inline int register_module_notifier(struct notifier_block * nb)
619 /* no events will happen anyway, so this can always succeed */
623 static inline int unregister_module_notifier(struct notifier_block * nb)
628 #define module_put_and_exit(code) do_exit(code)
630 static inline void print_modules(void)
634 static inline void module_update_tracepoints(void)
638 static inline int module_get_iter_tracepoints(struct tracepoint_iter *iter)
642 #endif /* CONFIG_MODULES */
645 extern struct kset *module_kset;
646 extern struct kobj_type module_ktype;
647 extern int module_sysfs_initialized;
648 #endif /* CONFIG_SYSFS */
650 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
652 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
654 #define __MODULE_STRING(x) __stringify(x)
656 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
657 extern void set_all_modules_text_rw(void);
658 extern void set_all_modules_text_ro(void);
660 static inline void set_all_modules_text_rw(void) { }
661 static inline void set_all_modules_text_ro(void) { }
664 #ifdef CONFIG_GENERIC_BUG
665 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
667 void module_bug_cleanup(struct module *);
669 #else /* !CONFIG_GENERIC_BUG */
671 static inline void module_bug_finalize(const Elf_Ehdr *hdr,
672 const Elf_Shdr *sechdrs,
676 static inline void module_bug_cleanup(struct module *mod) {}
677 #endif /* CONFIG_GENERIC_BUG */
679 #endif /* _LINUX_MODULE_H */