include/linux/module.h

#ifndef _LINUX_MODULE_H
#define _LINUX_MODULE_H
/*
 * Dynamic loading of modules into the kernel.
 *
 * Rewritten by Richard Henderson <rth@tamu.edu> Dec 1996
 * Rewritten again by Rusty Russell, 2002
 */
#include <linux/list.h>
#include <linux/stat.h>
#include <linux/compiler.h>
#include <linux/cache.h>
#include <linux/kmod.h>
#include <linux/elf.h>
#include <linux/stringify.h>
#include <linux/kobject.h>
#include <linux/moduleparam.h>
#include <linux/tracepoint.h>
#include <linux/export.h>

#include <linux/percpu.h>
#include <asm/module.h>

#define MODULE_SUPPORTED_DEVICE(name)

#define MODULE_NAME_LEN MAX_PARAM_PREFIX_LEN

struct modversion_info
{
	unsigned long crc;
	char name[MODULE_NAME_LEN];
};

struct module;

struct module_kobject {
	struct kobject kobj;
	struct module *mod;
	struct kobject *drivers_dir;
	struct module_param_attrs *mp;
};

struct module_attribute {
	struct attribute attr;
	ssize_t (*show)(struct module_attribute *, struct module_kobject *,
			char *);
	ssize_t (*store)(struct module_attribute *, struct module_kobject *,
			 const char *, size_t count);
	void (*setup)(struct module *, const char *);
	int (*test)(struct module *);
	void (*free)(struct module *);
};

struct module_version_attribute {
	struct module_attribute mattr;
	const char *module_name;
	const char *version;
} __attribute__ ((__aligned__(sizeof(void *))));

extern ssize_t __modver_version_show(struct module_attribute *,
				     struct module_kobject *, char *);

extern struct module_attribute module_uevent;

extern int init_module(void);
extern void cleanup_module(void);

struct exception_table_entry;

const struct exception_table_entry *
search_extable(const struct exception_table_entry *first,
	       const struct exception_table_entry *last,
	       unsigned long value);
void sort_extable(struct exception_table_entry *start,
		  struct exception_table_entry *finish);
void sort_main_extable(void);
void trim_init_extable(struct module *m);

#ifdef MODULE
#define MODULE_GENERIC_TABLE(gtype,name)			\
extern const struct gtype##_id __mod_##gtype##_table		\
  __attribute__ ((unused, alias(__stringify(name))))

#else  
#define MODULE_GENERIC_TABLE(gtype,name)
#endif

#define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)

#define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)

/*
 * The following license idents are currently accepted as indicating free
 * software modules
 *
 *	"GPL"				[GNU Public License v2 or later]
 *	"GPL v2"			[GNU Public License v2]
 *	"GPL and additional rights"	[GNU Public License v2 rights and more]
 *	"Dual BSD/GPL"			[GNU Public License v2
 *					 or BSD license choice]
 *	"Dual MIT/GPL"			[GNU Public License v2
 *					 or MIT license choice]
 *	"Dual MPL/GPL"			[GNU Public License v2
 *					 or Mozilla license choice]
 *
 * The following other idents are available
 *
 *	"Proprietary"			[Non free products]
 *
 * There are dual licensed components, but when running with Linux it is the
 * GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL
 * is a GPL combined work.
 *
 * This exists for several reasons
 * 1.	So modinfo can show license info for users wanting to vet their setup 
 *	is free
 * 2.	So the community can ignore bug reports including proprietary modules
 * 3.	So vendors can do likewise based on their own policies
 */
#define MODULE_LICENSE(_license) MODULE_INFO(license, _license)

#define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
  
#define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)

#define MODULE_DEVICE_TABLE(type,name)		\
  MODULE_GENERIC_TABLE(type##_device,name)


#if defined(MODULE) || !defined(CONFIG_SYSFS)
#define MODULE_VERSION(_version) MODULE_INFO(version, _version)
#else
#define MODULE_VERSION(_version)					\
	static struct module_version_attribute ___modver_attr = {	\
		.mattr	= {						\
			.attr	= {					\
				.name	= "version",			\
				.mode	= S_IRUGO,			\
			},						\
			.show	= __modver_version_show,		\
		},							\
		.module_name	= KBUILD_MODNAME,			\
		.version	= _version,				\
	};								\
	static const struct module_version_attribute			\
	__used __attribute__ ((__section__ ("__modver")))		\
	* __moduleparam_const __modver_attr = &___modver_attr
#endif

#define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)

const struct exception_table_entry *search_exception_tables(unsigned long add);

struct notifier_block;

#ifdef CONFIG_MODULES

extern int modules_disabled; 
void *__symbol_get(const char *symbol);
void *__symbol_get_gpl(const char *symbol);
#define symbol_get(x) ((typeof(&x))(__symbol_get(MODULE_SYMBOL_PREFIX #x)))

struct module_use {
	struct list_head source_list;
	struct list_head target_list;
	struct module *source, *target;
};

enum module_state
{
	MODULE_STATE_LIVE,
	MODULE_STATE_COMING,
	MODULE_STATE_GOING,
};

struct module_ref {
	unsigned long incs;
	unsigned long decs;
} __attribute((aligned(2 * sizeof(unsigned long))));

struct module
{
	enum module_state state;

	
	struct list_head list;

	
	char name[MODULE_NAME_LEN];

	
	struct module_kobject mkobj;
	struct module_attribute *modinfo_attrs;
	const char *version;
	const char *srcversion;
	struct kobject *holders_dir;

	
	const struct kernel_symbol *syms;
	const unsigned long *crcs;
	unsigned int num_syms;

	
	struct kernel_param *kp;
	unsigned int num_kp;

	/* GPL-only exported symbols. */
	unsigned int num_gpl_syms;
	const struct kernel_symbol *gpl_syms;
	const unsigned long *gpl_crcs;

#ifdef CONFIG_UNUSED_SYMBOLS
	
	const struct kernel_symbol *unused_syms;
	const unsigned long *unused_crcs;
	unsigned int num_unused_syms;

	/* GPL-only, unused exported symbols. */
	unsigned int num_unused_gpl_syms;
	const struct kernel_symbol *unused_gpl_syms;
	const unsigned long *unused_gpl_crcs;
#endif

	/* symbols that will be GPL-only in the near future. */
	const struct kernel_symbol *gpl_future_syms;
	const unsigned long *gpl_future_crcs;
	unsigned int num_gpl_future_syms;

	
	unsigned int num_exentries;
	struct exception_table_entry *extable;

	
	int (*init)(void);

	
	void *module_init;

	
	void *module_core;

	
	unsigned int init_size, core_size;

	
	unsigned int init_text_size, core_text_size;

	
	unsigned int init_ro_size, core_ro_size;

	
	struct mod_arch_specific arch;

	unsigned int taints;	

#ifdef CONFIG_GENERIC_BUG
	
	unsigned num_bugs;
	struct list_head bug_list;
	struct bug_entry *bug_table;
#endif

#ifdef CONFIG_KALLSYMS
	Elf_Sym *symtab, *core_symtab;
	unsigned int num_symtab, core_num_syms;
	char *strtab, *core_strtab;

	
	struct module_sect_attrs *sect_attrs;

	
	struct module_notes_attrs *notes_attrs;
#endif

	char *args;

#ifdef CONFIG_SMP
	
	void __percpu *percpu;
	unsigned int percpu_size;
#endif

#ifdef CONFIG_TRACEPOINTS
	unsigned int num_tracepoints;
	struct tracepoint * const *tracepoints_ptrs;
#endif
#ifdef HAVE_JUMP_LABEL
	struct jump_entry *jump_entries;
	unsigned int num_jump_entries;
#endif
#ifdef CONFIG_TRACING
	unsigned int num_trace_bprintk_fmt;
	const char **trace_bprintk_fmt_start;
#endif
#ifdef CONFIG_EVENT_TRACING
	struct ftrace_event_call **trace_events;
	unsigned int num_trace_events;
#endif
#ifdef CONFIG_FTRACE_MCOUNT_RECORD
	unsigned int num_ftrace_callsites;
	unsigned long *ftrace_callsites;
#endif

#ifdef CONFIG_MODULE_UNLOAD
	
	struct list_head source_list;
	
	struct list_head target_list;

	
	struct task_struct *waiter;

	
	void (*exit)(void);

	struct module_ref __percpu *refptr;
#endif

#ifdef CONFIG_CONSTRUCTORS
	
	ctor_fn_t *ctors;
	unsigned int num_ctors;
#endif
};
#ifndef MODULE_ARCH_INIT
#define MODULE_ARCH_INIT {}
#endif

extern struct mutex module_mutex;

static inline int module_is_live(struct module *mod)
{
	return mod->state != MODULE_STATE_GOING;
}

struct module *__module_text_address(unsigned long addr);
struct module *__module_address(unsigned long addr);
bool is_module_address(unsigned long addr);
bool is_module_percpu_address(unsigned long addr);
bool is_module_text_address(unsigned long addr);

static inline int within_module_core(unsigned long addr, struct module *mod)
{
	return (unsigned long)mod->module_core <= addr &&
	       addr < (unsigned long)mod->module_core + mod->core_size;
}

static inline int within_module_init(unsigned long addr, struct module *mod)
{
	return (unsigned long)mod->module_init <= addr &&
	       addr < (unsigned long)mod->module_init + mod->init_size;
}

struct module *find_module(const char *name);

struct symsearch {
	const struct kernel_symbol *start, *stop;
	const unsigned long *crcs;
	enum {
		NOT_GPL_ONLY,
		GPL_ONLY,
		WILL_BE_GPL_ONLY,
	} licence;
	bool unused;
};

const struct kernel_symbol *find_symbol(const char *name,
					struct module **owner,
					const unsigned long **crc,
					bool gplok,
					bool warn);

bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
				    struct module *owner,
				    void *data), void *data);

int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
			char *name, char *module_name, int *exported);

unsigned long module_kallsyms_lookup_name(const char *name);

int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
					     struct module *, unsigned long),
				   void *data);

extern void __module_put_and_exit(struct module *mod, long code)
	__attribute__((noreturn));
#define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code);

#ifdef CONFIG_MODULE_UNLOAD
unsigned long module_refcount(struct module *mod);
void __symbol_put(const char *symbol);
#define symbol_put(x) __symbol_put(MODULE_SYMBOL_PREFIX #x)
void symbol_put_addr(void *addr);

extern void __module_get(struct module *module);

extern bool try_module_get(struct module *module);

extern void module_put(struct module *module);

#else 
static inline int try_module_get(struct module *module)
{
	return !module || module_is_live(module);
}
static inline void module_put(struct module *module)
{
}
static inline void __module_get(struct module *module)
{
}
#define symbol_put(x) do { } while(0)
#define symbol_put_addr(p) do { } while(0)

#endif 
int ref_module(struct module *a, struct module *b);

#define module_name(mod)			\
({						\
	struct module *__mod = (mod);		\
	__mod ? __mod->name : "kernel";		\
})

const char *module_address_lookup(unsigned long addr,
			    unsigned long *symbolsize,
			    unsigned long *offset,
			    char **modname,
			    char *namebuf);
int lookup_module_symbol_name(unsigned long addr, char *symname);
int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);

const struct exception_table_entry *search_module_extables(unsigned long addr);

int register_module_notifier(struct notifier_block * nb);
int unregister_module_notifier(struct notifier_block * nb);

extern void print_modules(void);

#else 

static inline const struct exception_table_entry *
search_module_extables(unsigned long addr)
{
	return NULL;
}

static inline struct module *__module_address(unsigned long addr)
{
	return NULL;
}

static inline struct module *__module_text_address(unsigned long addr)
{
	return NULL;
}

static inline bool is_module_address(unsigned long addr)
{
	return false;
}

static inline bool is_module_percpu_address(unsigned long addr)
{
	return false;
}

static inline bool is_module_text_address(unsigned long addr)
{
	return false;
}

#define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
#define symbol_put(x) do { } while(0)
#define symbol_put_addr(x) do { } while(0)

static inline void __module_get(struct module *module)
{
}

static inline int try_module_get(struct module *module)
{
	return 1;
}

static inline void module_put(struct module *module)
{
}

#define module_name(mod) "kernel"

static inline const char *module_address_lookup(unsigned long addr,
					  unsigned long *symbolsize,
					  unsigned long *offset,
					  char **modname,
					  char *namebuf)
{
	return NULL;
}

static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
{
	return -ERANGE;
}

static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
{
	return -ERANGE;
}

static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
					char *type, char *name,
					char *module_name, int *exported)
{
	return -ERANGE;
}

static inline unsigned long module_kallsyms_lookup_name(const char *name)
{
	return 0;
}

static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
							   struct module *,
							   unsigned long),
						 void *data)
{
	return 0;
}

static inline int register_module_notifier(struct notifier_block * nb)
{
	
	return 0;
}

static inline int unregister_module_notifier(struct notifier_block * nb)
{
	return 0;
}

#define module_put_and_exit(code) do_exit(code)

static inline void print_modules(void)
{
}
#endif 

#ifdef CONFIG_SYSFS
extern struct kset *module_kset;
extern struct kobj_type module_ktype;
extern int module_sysfs_initialized;
#endif 

#define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)


#define __MODULE_STRING(x) __stringify(x)

#ifdef CONFIG_DEBUG_SET_MODULE_RONX
extern void set_all_modules_text_rw(void);
extern void set_all_modules_text_ro(void);
#else
static inline void set_all_modules_text_rw(void) { }
static inline void set_all_modules_text_ro(void) { }
#endif

#ifdef CONFIG_GENERIC_BUG
void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
			 struct module *);
void module_bug_cleanup(struct module *);

#else	

static inline void module_bug_finalize(const Elf_Ehdr *hdr,
					const Elf_Shdr *sechdrs,
					struct module *mod)
{
}
static inline void module_bug_cleanup(struct module *mod) {}
#endif	

#endif