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/sched.h>
10 #include <linux/spinlock.h>
11 #include <linux/list.h>
12 #include <linux/stat.h>
13 #include <linux/compiler.h>
14 #include <linux/cache.h>
15 #include <linux/kmod.h>
16 #include <linux/elf.h>
17 #include <linux/stringify.h>
18 #include <linux/kobject.h>
19 #include <linux/moduleparam.h>
20 #include <asm/local.h>
22 #include <asm/module.h>
24 /* Not Yet Implemented */
25 #define MODULE_SUPPORTED_DEVICE(name)
27 /* v850 toolchain uses a `_' prefix for all user symbols */
28 #ifndef MODULE_SYMBOL_PREFIX
29 #define MODULE_SYMBOL_PREFIX ""
32 #define MODULE_NAME_LEN (64 - sizeof(unsigned long))
40 struct modversion_info
43 char name[MODULE_NAME_LEN];
48 struct module_attribute {
49 struct attribute attr;
50 ssize_t (*show)(struct module_attribute *, struct module *, char *);
51 ssize_t (*store)(struct module_attribute *, struct module *,
52 const char *, size_t count);
53 void (*setup)(struct module *, const char *);
54 int (*test)(struct module *);
55 void (*free)(struct module *);
64 /* These are either module local, or the kernel's dummy ones. */
65 extern int init_module(void);
66 extern void cleanup_module(void);
68 /* Archs provide a method of finding the correct exception table. */
69 struct exception_table_entry;
71 const struct exception_table_entry *
72 search_extable(const struct exception_table_entry *first,
73 const struct exception_table_entry *last,
75 void sort_extable(struct exception_table_entry *start,
76 struct exception_table_entry *finish);
77 void sort_main_extable(void);
79 extern struct subsystem module_subsys;
82 #define MODULE_GENERIC_TABLE(gtype,name) \
83 extern const struct gtype##_id __mod_##gtype##_table \
84 __attribute__ ((unused, alias(__stringify(name))))
86 extern struct module __this_module;
87 #define THIS_MODULE (&__this_module)
89 #define MODULE_GENERIC_TABLE(gtype,name)
90 #define THIS_MODULE ((struct module *)0)
93 /* Generic info of form tag = "info" */
94 #define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
96 /* For userspace: you can also call me... */
97 #define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
100 * The following license idents are currently accepted as indicating free
103 * "GPL" [GNU Public License v2 or later]
104 * "GPL v2" [GNU Public License v2]
105 * "GPL and additional rights" [GNU Public License v2 rights and more]
106 * "Dual BSD/GPL" [GNU Public License v2
107 * or BSD license choice]
108 * "Dual MIT/GPL" [GNU Public License v2
109 * or MIT license choice]
110 * "Dual MPL/GPL" [GNU Public License v2
111 * or Mozilla license choice]
113 * The following other idents are available
115 * "Proprietary" [Non free products]
117 * There are dual licensed components, but when running with Linux it is the
118 * GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL
119 * is a GPL combined work.
121 * This exists for several reasons
122 * 1. So modinfo can show license info for users wanting to vet their setup
124 * 2. So the community can ignore bug reports including proprietary modules
125 * 3. So vendors can do likewise based on their own policies
127 #define MODULE_LICENSE(_license) MODULE_INFO(license, _license)
129 /* Author, ideally of form NAME <EMAIL>[, NAME <EMAIL>]*[ and NAME <EMAIL>] */
130 #define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
132 /* What your module does. */
133 #define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
135 /* One for each parameter, describing how to use it. Some files do
136 multiple of these per line, so can't just use MODULE_INFO. */
137 #define MODULE_PARM_DESC(_parm, desc) \
138 __MODULE_INFO(parm, _parm, #_parm ":" desc)
140 #define MODULE_DEVICE_TABLE(type,name) \
141 MODULE_GENERIC_TABLE(type##_device,name)
143 /* Version of form [<epoch>:]<version>[-<extra-version>].
144 Or for CVS/RCS ID version, everything but the number is stripped.
145 <epoch>: A (small) unsigned integer which allows you to start versions
146 anew. If not mentioned, it's zero. eg. "2:1.0" is after
148 <version>: The <version> may contain only alphanumerics and the
149 character `.'. Ordered by numeric sort for numeric parts,
150 ascii sort for ascii parts (as per RPM or DEB algorithm).
151 <extraversion>: Like <version>, but inserted for local
152 customizations, eg "rh3" or "rusty1".
154 Using this automatically adds a checksum of the .c files and the
155 local headers in "srcversion".
157 #define MODULE_VERSION(_version) MODULE_INFO(version, _version)
159 /* Optional firmware file (or files) needed by the module
160 * format is simply firmware file name. Multiple firmware
161 * files require multiple MODULE_FIRMWARE() specifiers */
162 #define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
164 /* Given an address, look for it in the exception tables */
165 const struct exception_table_entry *search_exception_tables(unsigned long add);
167 struct notifier_block;
169 #ifdef CONFIG_MODULES
171 /* Get/put a kernel symbol (calls must be symmetric) */
172 void *__symbol_get(const char *symbol);
173 void *__symbol_get_gpl(const char *symbol);
174 #define symbol_get(x) ((typeof(&x))(__symbol_get(MODULE_SYMBOL_PREFIX #x)))
177 #ifdef CONFIG_MODVERSIONS
178 /* Mark the CRC weak since genksyms apparently decides not to
179 * generate a checksums for some symbols */
180 #define __CRC_SYMBOL(sym, sec) \
181 extern void *__crc_##sym __attribute__((weak)); \
182 static const unsigned long __kcrctab_##sym \
184 __attribute__((section("__kcrctab" sec), unused)) \
185 = (unsigned long) &__crc_##sym;
187 #define __CRC_SYMBOL(sym, sec)
190 /* For every exported symbol, place a struct in the __ksymtab section */
191 #define __EXPORT_SYMBOL(sym, sec) \
192 extern typeof(sym) sym; \
193 __CRC_SYMBOL(sym, sec) \
194 static const char __kstrtab_##sym[] \
195 __attribute__((section("__ksymtab_strings"))) \
196 = MODULE_SYMBOL_PREFIX #sym; \
197 static const struct kernel_symbol __ksymtab_##sym \
199 __attribute__((section("__ksymtab" sec), unused)) \
200 = { (unsigned long)&sym, __kstrtab_##sym }
202 #define EXPORT_SYMBOL(sym) \
203 __EXPORT_SYMBOL(sym, "")
205 #define EXPORT_SYMBOL_GPL(sym) \
206 __EXPORT_SYMBOL(sym, "_gpl")
208 #define EXPORT_SYMBOL_GPL_FUTURE(sym) \
209 __EXPORT_SYMBOL(sym, "_gpl_future")
212 #ifdef CONFIG_UNUSED_SYMBOLS
213 #define EXPORT_UNUSED_SYMBOL(sym) __EXPORT_SYMBOL(sym, "_unused")
214 #define EXPORT_UNUSED_SYMBOL_GPL(sym) __EXPORT_SYMBOL(sym, "_unused_gpl")
216 #define EXPORT_UNUSED_SYMBOL(sym)
217 #define EXPORT_UNUSED_SYMBOL_GPL(sym)
225 } ____cacheline_aligned;
234 /* Similar stuff for section attributes. */
235 struct module_sect_attr
237 struct module_attribute mattr;
239 unsigned long address;
242 struct module_sect_attrs
244 struct attribute_group grp;
246 struct module_sect_attr attrs[0];
249 struct module_param_attrs;
253 enum module_state state;
255 /* Member of list of modules */
256 struct list_head list;
258 /* Unique handle for this module */
259 char name[MODULE_NAME_LEN];
262 struct module_kobject mkobj;
263 struct module_param_attrs *param_attrs;
264 struct module_attribute *modinfo_attrs;
266 const char *srcversion;
268 /* Exported symbols */
269 const struct kernel_symbol *syms;
270 unsigned int num_syms;
271 const unsigned long *crcs;
273 /* GPL-only exported symbols. */
274 const struct kernel_symbol *gpl_syms;
275 unsigned int num_gpl_syms;
276 const unsigned long *gpl_crcs;
278 /* unused exported symbols. */
279 const struct kernel_symbol *unused_syms;
280 unsigned int num_unused_syms;
281 const unsigned long *unused_crcs;
282 /* GPL-only, unused exported symbols. */
283 const struct kernel_symbol *unused_gpl_syms;
284 unsigned int num_unused_gpl_syms;
285 const unsigned long *unused_gpl_crcs;
287 /* symbols that will be GPL-only in the near future. */
288 const struct kernel_symbol *gpl_future_syms;
289 unsigned int num_gpl_future_syms;
290 const unsigned long *gpl_future_crcs;
292 /* Exception table */
293 unsigned int num_exentries;
294 const struct exception_table_entry *extable;
296 /* Startup function. */
299 /* If this is non-NULL, vfree after init() returns */
302 /* Here is the actual code + data, vfree'd on unload. */
305 /* Here are the sizes of the init and core sections */
306 unsigned long init_size, core_size;
308 /* The size of the executable code in each section. */
309 unsigned long init_text_size, core_text_size;
311 /* The handle returned from unwind_add_table. */
314 /* Arch-specific module values */
315 struct mod_arch_specific arch;
317 /* Am I unsafe to unload? */
320 /* Am I GPL-compatible */
323 unsigned int taints; /* same bits as kernel:tainted */
325 #ifdef CONFIG_MODULE_UNLOAD
326 /* Reference counts */
327 struct module_ref ref[NR_CPUS];
329 /* What modules depend on me? */
330 struct list_head modules_which_use_me;
332 /* Who is waiting for us to be unloaded */
333 struct task_struct *waiter;
335 /* Destruction function. */
339 #ifdef CONFIG_KALLSYMS
340 /* We keep the symbol and string tables for kallsyms. */
342 unsigned long num_symtab;
345 /* Section attributes */
346 struct module_sect_attrs *sect_attrs;
352 /* The command line arguments (may be mangled). People like
353 keeping pointers to this stuff */
357 /* FIXME: It'd be nice to isolate modules during init, too, so they
358 aren't used before they (may) fail. But presently too much code
359 (IDE & SCSI) require entry into the module during init.*/
360 static inline int module_is_live(struct module *mod)
362 return mod->state != MODULE_STATE_GOING;
365 /* Is this address in a module? (second is with no locks, for oops) */
366 struct module *module_text_address(unsigned long addr);
367 struct module *__module_text_address(unsigned long addr);
368 int is_module_address(unsigned long addr);
370 /* Returns module and fills in value, defined and namebuf, or NULL if
371 symnum out of range. */
372 struct module *module_get_kallsym(unsigned int symnum, unsigned long *value,
373 char *type, char *name, size_t namelen);
375 /* Look for this name: can be of form module:name. */
376 unsigned long module_kallsyms_lookup_name(const char *name);
378 int is_exported(const char *name, const struct module *mod);
380 extern void __module_put_and_exit(struct module *mod, long code)
381 __attribute__((noreturn));
382 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code);
384 #ifdef CONFIG_MODULE_UNLOAD
385 unsigned int module_refcount(struct module *mod);
386 void __symbol_put(const char *symbol);
387 #define symbol_put(x) __symbol_put(MODULE_SYMBOL_PREFIX #x)
388 void symbol_put_addr(void *addr);
390 /* Sometimes we know we already have a refcount, and it's easier not
391 to handle the error case (which only happens with rmmod --wait). */
392 static inline void __module_get(struct module *module)
395 BUG_ON(module_refcount(module) == 0);
396 local_inc(&module->ref[get_cpu()].count);
401 static inline int try_module_get(struct module *module)
406 unsigned int cpu = get_cpu();
407 if (likely(module_is_live(module)))
408 local_inc(&module->ref[cpu].count);
416 static inline void module_put(struct module *module)
419 unsigned int cpu = get_cpu();
420 local_dec(&module->ref[cpu].count);
421 /* Maybe they're waiting for us to drop reference? */
422 if (unlikely(!module_is_live(module)))
423 wake_up_process(module->waiter);
428 #else /*!CONFIG_MODULE_UNLOAD*/
429 static inline int try_module_get(struct module *module)
431 return !module || module_is_live(module);
433 static inline void module_put(struct module *module)
436 static inline void __module_get(struct module *module)
439 #define symbol_put(x) do { } while(0)
440 #define symbol_put_addr(p) do { } while(0)
442 #endif /* CONFIG_MODULE_UNLOAD */
444 /* This is a #define so the string doesn't get put in every .o file */
445 #define module_name(mod) \
447 struct module *__mod = (mod); \
448 __mod ? __mod->name : "kernel"; \
451 #define __unsafe(mod) \
453 if (mod && !(mod)->unsafe) { \
454 printk(KERN_WARNING \
455 "Module %s cannot be unloaded due to unsafe usage in" \
456 " %s:%u\n", (mod)->name, __FILE__, __LINE__); \
461 /* For kallsyms to ask for address resolution. NULL means not found. */
462 const char *module_address_lookup(unsigned long addr,
463 unsigned long *symbolsize,
464 unsigned long *offset,
467 /* For extable.c to search modules' exception tables. */
468 const struct exception_table_entry *search_module_extables(unsigned long addr);
470 int register_module_notifier(struct notifier_block * nb);
471 int unregister_module_notifier(struct notifier_block * nb);
473 extern void print_modules(void);
475 struct device_driver;
476 void module_add_driver(struct module *, struct device_driver *);
477 void module_remove_driver(struct device_driver *);
479 #else /* !CONFIG_MODULES... */
480 #define EXPORT_SYMBOL(sym)
481 #define EXPORT_SYMBOL_GPL(sym)
482 #define EXPORT_SYMBOL_GPL_FUTURE(sym)
483 #define EXPORT_UNUSED_SYMBOL(sym)
484 #define EXPORT_UNUSED_SYMBOL_GPL(sym)
486 /* Given an address, look for it in the exception tables. */
487 static inline const struct exception_table_entry *
488 search_module_extables(unsigned long addr)
493 /* Is this address in a module? */
494 static inline struct module *module_text_address(unsigned long addr)
499 /* Is this address in a module? (don't take a lock, we're oopsing) */
500 static inline struct module *__module_text_address(unsigned long addr)
505 static inline int is_module_address(unsigned long addr)
510 /* Get/put a kernel symbol (calls should be symmetric) */
511 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
512 #define symbol_put(x) do { } while(0)
513 #define symbol_put_addr(x) do { } while(0)
515 static inline void __module_get(struct module *module)
519 static inline int try_module_get(struct module *module)
524 static inline void module_put(struct module *module)
528 #define module_name(mod) "kernel"
530 #define __unsafe(mod)
532 /* For kallsyms to ask for address resolution. NULL means not found. */
533 static inline const char *module_address_lookup(unsigned long addr,
534 unsigned long *symbolsize,
535 unsigned long *offset,
541 static inline struct module *module_get_kallsym(unsigned int symnum,
542 unsigned long *value,
543 char *type, char *name,
549 static inline unsigned long module_kallsyms_lookup_name(const char *name)
554 static inline int is_exported(const char *name, const struct module *mod)
559 static inline int register_module_notifier(struct notifier_block * nb)
561 /* no events will happen anyway, so this can always succeed */
565 static inline int unregister_module_notifier(struct notifier_block * nb)
570 #define module_put_and_exit(code) do_exit(code)
572 static inline void print_modules(void)
576 struct device_driver;
579 static inline void module_add_driver(struct module *module, struct device_driver *driver)
583 static inline void module_remove_driver(struct device_driver *driver)
587 #endif /* CONFIG_MODULES */
589 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
591 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
593 #define __MODULE_STRING(x) __stringify(x)
595 #endif /* _LINUX_MODULE_H */