Go to most recent revision |
Blame |
Compare with Previous |
Last modification |
View Log
| RSS feed
#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/config.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#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 <asm/local.h>
#include <asm/module.h>
/* Not Yet Implemented */
#define MODULE_SUPPORTED_DEVICE(name)
#define print_modules()
/* v850 toolchain uses a `_' prefix for all user symbols */
#ifndef MODULE_SYMBOL_PREFIX
#define MODULE_SYMBOL_PREFIX ""
#endif
#define MODULE_NAME_LEN (64 - sizeof(unsigned long))
struct kernel_symbol
{
unsigned long value;
const char *name;
};
struct modversion_info
{
unsigned long crc;
char name[MODULE_NAME_LEN];
};
/* These are either module local, or the kernel's dummy ones. */
extern int init_module(void);
extern void cleanup_module(void);
/* Archs provide a method of finding the correct exception table. */
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);
#ifdef MODULE
#define ___module_cat(a,b) __mod_ ## a ## b
#define __module_cat(a,b) ___module_cat(a,b)
#define __MODULE_INFO(tag, name, info) \
static const char __module_cat(name,__LINE__)[] \
__attribute__((section(".modinfo"),unused)) = __stringify(tag) "=" info
#define MODULE_GENERIC_TABLE(gtype,name) \
extern const struct gtype##_id __mod_##gtype##_table \
__attribute__ ((unused, alias(__stringify(name))))
#define THIS_MODULE (&__this_module)
#else /* !MODULE */
#define MODULE_GENERIC_TABLE(gtype,name)
#define __MODULE_INFO(tag, name, info)
#define THIS_MODULE ((struct module *)0)
#endif
/* Generic info of form tag = "info" */
#define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
/* For userspace: you can also call me... */
#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 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)
/* Author, ideally of form NAME <EMAIL>[, NAME <EMAIL>]*[ and NAME <EMAIL>] */
#define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
/* What your module does. */
#define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
/* One for each parameter, describing how to use it. Some files do
multiple of these per line, so can't just use MODULE_INFO. */
#define MODULE_PARM_DESC(_parm, desc) \
__MODULE_INFO(parm, _parm, #_parm ":" desc)
#define MODULE_DEVICE_TABLE(type,name) \
MODULE_GENERIC_TABLE(type##_device,name)
/* Given an address, look for it in the exception tables */
const struct exception_table_entry *search_exception_tables(unsigned long add);
struct notifier_block;
#ifdef CONFIG_MODULES
/* Get/put a kernel symbol (calls must be symmetric) */
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)))
#ifndef __GENKSYMS__
#ifdef CONFIG_MODVERSIONS
/* Mark the CRC weak since genksyms apparently decides not to
* generate a checksums for some symbols */
#define __CRC_SYMBOL(sym, sec) \
extern void *__crc_##sym __attribute__((weak)); \
static const unsigned long __kcrctab_##sym \
__attribute__((section("__kcrctab" sec), unused)) \
= (unsigned long) &__crc_##sym;
#else
#define __CRC_SYMBOL(sym, sec)
#endif
/* For every exported symbol, place a struct in the __ksymtab section */
#define __EXPORT_SYMBOL(sym, sec) \
__CRC_SYMBOL(sym, sec) \
static const char __kstrtab_##sym[] \
__attribute__((section("__ksymtab_strings"))) \
= MODULE_SYMBOL_PREFIX #sym; \
static const struct kernel_symbol __ksymtab_##sym \
__attribute__((section("__ksymtab" sec), unused)) \
= { (unsigned long)&sym, __kstrtab_##sym }
#define EXPORT_SYMBOL(sym) \
__EXPORT_SYMBOL(sym, "")
#define EXPORT_SYMBOL_GPL(sym) \
__EXPORT_SYMBOL(sym, "_gpl")
#endif
/* We don't mangle the actual symbol anymore, so no need for
* special casing EXPORT_SYMBOL_NOVERS. FIXME: Deprecated */
#define EXPORT_SYMBOL_NOVERS(sym) EXPORT_SYMBOL(sym)
struct module_ref
{
local_t count;
} ____cacheline_aligned;
enum module_state
{
MODULE_STATE_LIVE,
MODULE_STATE_COMING,
MODULE_STATE_GOING,
};
struct module
{
enum module_state state;
/* Member of list of modules */
struct list_head list;
/* Unique handle for this module */
char name[MODULE_NAME_LEN];
/* Exported symbols */
const struct kernel_symbol *syms;
unsigned int num_syms;
const unsigned long *crcs;
/* GPL-only exported symbols. */
const struct kernel_symbol *gpl_syms;
unsigned int num_gpl_syms;
const unsigned long *gpl_crcs;
/* Exception table */
unsigned int num_exentries;
const struct exception_table_entry *extable;
/* Startup function. */
int (*init)(void);
/* If this is non-NULL, vfree after init() returns */
void *module_init;
/* Here is the actual code + data, vfree'd on unload. */
void *module_core;
/* Here are the sizes of the init and core sections */
unsigned long init_size, core_size;
/* The size of the executable code in each section. */
unsigned long init_text_size, core_text_size;
/* Arch-specific module values */
struct mod_arch_specific arch;
/* Am I unsafe to unload? */
int unsafe;
/* Am I GPL-compatible */
int license_gplok;
#ifdef CONFIG_MODULE_UNLOAD
/* Reference counts */
struct module_ref ref[NR_CPUS];
/* What modules depend on me? */
struct list_head modules_which_use_me;
/* Who is waiting for us to be unloaded */
struct task_struct *waiter;
/* Destruction function. */
void (*exit)(void);
#endif
#ifdef CONFIG_KALLSYMS
/* We keep the symbol and string tables for kallsyms. */
Elf_Sym *symtab;
unsigned long num_symtab;
char *strtab;
#endif
/* Per-cpu data. */
void *percpu;
/* The command line arguments (may be mangled). People like
keeping pointers to this stuff */
char *args;
};
/* FIXME: It'd be nice to isolate modules during init, too, so they
aren't used before they (may) fail. But presently too much code
(IDE & SCSI) require entry into the module during init.*/
static inline int module_is_live(struct module *mod)
{
return mod->state != MODULE_STATE_GOING;
}
/* Is this address in a module? */
struct module *module_text_address(unsigned long addr);
/* Returns module and fills in value, defined and namebuf, or NULL if
symnum out of range. */
struct module *module_get_kallsym(unsigned int symnum,
unsigned long *value,
char *type,
char namebuf[128]);
int is_exported(const char *name, const struct module *mod);
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 int 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);
/* Sometimes we know we already have a refcount, and it's easier not
to handle the error case (which only happens with rmmod --wait). */
static inline void __module_get(struct module *module)
{
if (module) {
BUG_ON(module_refcount(module) == 0);
local_inc(&module->ref[get_cpu()].count);
put_cpu();
}
}
static inline int try_module_get(struct module *module)
{
int ret = 1;
if (module) {
unsigned int cpu = get_cpu();
if (likely(module_is_live(module)))
local_inc(&module->ref[cpu].count);
else
ret = 0;
put_cpu();
}
return ret;
}
static inline void module_put(struct module *module)
{
if (module) {
unsigned int cpu = get_cpu();
local_dec(&module->ref[cpu].count);
/* Maybe they're waiting for us to drop reference? */
if (unlikely(!module_is_live(module)))
wake_up_process(module->waiter);
put_cpu();
}
}
#else /*!CONFIG_MODULE_UNLOAD*/
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 /* CONFIG_MODULE_UNLOAD */
/* This is a #define so the string doesn't get put in every .o file */
#define module_name(mod) \
({ \
struct module *__mod = (mod); \
__mod ? __mod->name : "kernel"; \
})
#define __unsafe(mod) \
do { \
if (mod && !(mod)->unsafe) { \
printk(KERN_WARNING \
"Module %s cannot be unloaded due to unsafe usage in" \
" %s:%u\n", (mod)->name, __FILE__, __LINE__); \
(mod)->unsafe = 1; \
} \
} while(0)
/* For kallsyms to ask for address resolution. NULL means not found. */
const char *module_address_lookup(unsigned long addr,
unsigned long *symbolsize,
unsigned long *offset,
char **modname);
/* For extable.c to search modules' exception tables. */
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);
#else /* !CONFIG_MODULES... */
#define EXPORT_SYMBOL(sym)
#define EXPORT_SYMBOL_GPL(sym)
#define EXPORT_SYMBOL_NOVERS(sym)
/* Given an address, look for it in the exception tables. */
static inline const struct exception_table_entry *
search_module_extables(unsigned long addr)
{
return NULL;
}
/* Is this address in a module? */
static inline struct module *module_text_address(unsigned long addr)
{
return NULL;
}
/* Get/put a kernel symbol (calls should be symmetric) */
#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"
#define __unsafe(mod)
/* For kallsyms to ask for address resolution. NULL means not found. */
static inline const char *module_address_lookup(unsigned long addr,
unsigned long *symbolsize,
unsigned long *offset,
char **modname)
{
return NULL;
}
static inline struct module *module_get_kallsym(unsigned int symnum,
unsigned long *value,
char *type,
char namebuf[128])
{
return NULL;
}
static inline int is_exported(const char *name, const struct module *mod)
{
return 0;
}
static inline int register_module_notifier(struct notifier_block * nb)
{
/* no events will happen anyway, so this can always succeed */
return 0;
}
static inline int unregister_module_notifier(struct notifier_block * nb)
{
return 0;
}
#define module_put_and_exit(code) do_exit(code)
#endif /* CONFIG_MODULES */
#ifdef MODULE
extern struct module __this_module;
#ifdef KBUILD_MODNAME
/* We make the linker do some of the work. */
struct module __this_module
__attribute__((section(".gnu.linkonce.this_module"))) = {
.name = __stringify(KBUILD_MODNAME),
.init = init_module,
#ifdef CONFIG_MODULE_UNLOAD
.exit = cleanup_module,
#endif
};
#endif /* KBUILD_MODNAME */
#endif /* MODULE */
#define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
/* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
struct obsolete_modparm {
char name[64];
char type[64-sizeof(void *)];
void *addr;
};
#ifdef MODULE
/* DEPRECATED: Do not use. */
#define MODULE_PARM(var,type) \
struct obsolete_modparm __parm_##var __attribute__((section("__obsparm"))) = \
{ __stringify(var), type };
static inline void __deprecated MOD_INC_USE_COUNT(struct module *module)
{
__unsafe(module);
#if defined(CONFIG_MODULE_UNLOAD) && defined(MODULE)
local_inc(&module->ref[get_cpu()].count);
put_cpu();
#else
(void)try_module_get(module);
#endif
}
static inline void __deprecated MOD_DEC_USE_COUNT(struct module *module)
{
module_put(module);
}
#define MOD_INC_USE_COUNT MOD_INC_USE_COUNT(THIS_MODULE)
#define MOD_DEC_USE_COUNT MOD_DEC_USE_COUNT(THIS_MODULE)
#else
#define MODULE_PARM(var,type)
#define MOD_INC_USE_COUNT do { } while (0)
#define MOD_DEC_USE_COUNT do { } while (0)
#endif
#define __MODULE_STRING(x) __stringify(x)
/* Use symbol_get and symbol_put instead. You'll thank me. */
#define HAVE_INTER_MODULE
extern void inter_module_register(const char *, struct module *, const void *);
extern void inter_module_unregister(const char *);
extern const void *inter_module_get(const char *);
extern const void *inter_module_get_request(const char *, const char *);
extern void inter_module_put(const char *);
#endif /* _LINUX_MODULE_H */