593 lines
16 KiB
C
593 lines
16 KiB
C
#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/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 <linux/kobject.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <asm/local.h>
|
|
|
|
#include <asm/module.h>
|
|
|
|
/* Not Yet Implemented */
|
|
#define MODULE_SUPPORTED_DEVICE(name)
|
|
|
|
/* 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];
|
|
};
|
|
|
|
struct module;
|
|
|
|
struct module_attribute {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct module_attribute *, struct module *, char *);
|
|
ssize_t (*store)(struct module_attribute *, struct module *,
|
|
const char *, size_t count);
|
|
void (*setup)(struct module *, const char *);
|
|
int (*test)(struct module *);
|
|
void (*free)(struct module *);
|
|
};
|
|
|
|
struct module_kobject
|
|
{
|
|
struct kobject kobj;
|
|
struct module *mod;
|
|
};
|
|
|
|
/* 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);
|
|
void sort_extable(struct exception_table_entry *start,
|
|
struct exception_table_entry *finish);
|
|
void sort_main_extable(void);
|
|
|
|
extern struct subsystem module_subsys;
|
|
|
|
#ifdef MODULE
|
|
#define MODULE_GENERIC_TABLE(gtype,name) \
|
|
extern const struct gtype##_id __mod_##gtype##_table \
|
|
__attribute__ ((unused, alias(__stringify(name))))
|
|
|
|
extern struct module __this_module;
|
|
#define THIS_MODULE (&__this_module)
|
|
#else /* !MODULE */
|
|
#define MODULE_GENERIC_TABLE(gtype,name)
|
|
#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 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)
|
|
|
|
/* 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)
|
|
|
|
/* Version of form [<epoch>:]<version>[-<extra-version>].
|
|
Or for CVS/RCS ID version, everything but the number is stripped.
|
|
<epoch>: A (small) unsigned integer which allows you to start versions
|
|
anew. If not mentioned, it's zero. eg. "2:1.0" is after
|
|
"1:2.0".
|
|
<version>: The <version> may contain only alphanumerics and the
|
|
character `.'. Ordered by numeric sort for numeric parts,
|
|
ascii sort for ascii parts (as per RPM or DEB algorithm).
|
|
<extraversion>: Like <version>, but inserted for local
|
|
customizations, eg "rh3" or "rusty1".
|
|
|
|
Using this automatically adds a checksum of the .c files and the
|
|
local headers in "srcversion".
|
|
*/
|
|
#define MODULE_VERSION(_version) MODULE_INFO(version, _version)
|
|
|
|
/* Optional firmware file (or files) needed by the module
|
|
* format is simply firmware file name. Multiple firmware
|
|
* files require multiple MODULE_FIRMWARE() specifiers */
|
|
#define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
|
|
|
|
/* 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_used__ \
|
|
__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) \
|
|
extern typeof(sym) sym; \
|
|
__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_used__ \
|
|
__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")
|
|
|
|
#define EXPORT_SYMBOL_GPL_FUTURE(sym) \
|
|
__EXPORT_SYMBOL(sym, "_gpl_future")
|
|
|
|
|
|
#ifdef CONFIG_UNUSED_SYMBOLS
|
|
#define EXPORT_UNUSED_SYMBOL(sym) __EXPORT_SYMBOL(sym, "_unused")
|
|
#define EXPORT_UNUSED_SYMBOL_GPL(sym) __EXPORT_SYMBOL(sym, "_unused_gpl")
|
|
#else
|
|
#define EXPORT_UNUSED_SYMBOL(sym)
|
|
#define EXPORT_UNUSED_SYMBOL_GPL(sym)
|
|
#endif
|
|
|
|
#endif
|
|
|
|
struct module_ref
|
|
{
|
|
local_t count;
|
|
} ____cacheline_aligned;
|
|
|
|
enum module_state
|
|
{
|
|
MODULE_STATE_LIVE,
|
|
MODULE_STATE_COMING,
|
|
MODULE_STATE_GOING,
|
|
};
|
|
|
|
/* Similar stuff for section attributes. */
|
|
struct module_sect_attr
|
|
{
|
|
struct module_attribute mattr;
|
|
char *name;
|
|
unsigned long address;
|
|
};
|
|
|
|
struct module_sect_attrs
|
|
{
|
|
struct attribute_group grp;
|
|
int nsections;
|
|
struct module_sect_attr attrs[0];
|
|
};
|
|
|
|
struct module_param_attrs;
|
|
|
|
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];
|
|
|
|
/* Sysfs stuff. */
|
|
struct module_kobject mkobj;
|
|
struct module_param_attrs *param_attrs;
|
|
struct module_attribute *modinfo_attrs;
|
|
const char *version;
|
|
const char *srcversion;
|
|
|
|
/* 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;
|
|
|
|
/* unused exported symbols. */
|
|
const struct kernel_symbol *unused_syms;
|
|
unsigned int num_unused_syms;
|
|
const unsigned long *unused_crcs;
|
|
/* GPL-only, unused exported symbols. */
|
|
const struct kernel_symbol *unused_gpl_syms;
|
|
unsigned int num_unused_gpl_syms;
|
|
const unsigned long *unused_gpl_crcs;
|
|
|
|
/* symbols that will be GPL-only in the near future. */
|
|
const struct kernel_symbol *gpl_future_syms;
|
|
unsigned int num_gpl_future_syms;
|
|
const unsigned long *gpl_future_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;
|
|
|
|
/* The handle returned from unwind_add_table. */
|
|
void *unwind_info;
|
|
|
|
/* Arch-specific module values */
|
|
struct mod_arch_specific arch;
|
|
|
|
/* Am I unsafe to unload? */
|
|
int unsafe;
|
|
|
|
unsigned int taints; /* same bits as kernel:tainted */
|
|
|
|
#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;
|
|
|
|
/* Section attributes */
|
|
struct module_sect_attrs *sect_attrs;
|
|
#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? (second is with no locks, for oops) */
|
|
struct module *module_text_address(unsigned long addr);
|
|
struct module *__module_text_address(unsigned long addr);
|
|
int is_module_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 *name, size_t namelen);
|
|
|
|
/* Look for this name: can be of form module:name. */
|
|
unsigned long module_kallsyms_lookup_name(const char *name);
|
|
|
|
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);
|
|
|
|
extern void print_modules(void);
|
|
|
|
struct device_driver;
|
|
void module_add_driver(struct module *, struct device_driver *);
|
|
void module_remove_driver(struct device_driver *);
|
|
|
|
#else /* !CONFIG_MODULES... */
|
|
#define EXPORT_SYMBOL(sym)
|
|
#define EXPORT_SYMBOL_GPL(sym)
|
|
#define EXPORT_SYMBOL_GPL_FUTURE(sym)
|
|
#define EXPORT_UNUSED_SYMBOL(sym)
|
|
#define EXPORT_UNUSED_SYMBOL_GPL(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;
|
|
}
|
|
|
|
/* Is this address in a module? (don't take a lock, we're oopsing) */
|
|
static inline struct module *__module_text_address(unsigned long addr)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline int is_module_address(unsigned long addr)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* 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 *name,
|
|
size_t namelen)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline unsigned long module_kallsyms_lookup_name(const char *name)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
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)
|
|
|
|
static inline void print_modules(void)
|
|
{
|
|
}
|
|
|
|
struct device_driver;
|
|
struct module;
|
|
|
|
static inline void module_add_driver(struct module *module, struct device_driver *driver)
|
|
{
|
|
}
|
|
|
|
static inline void module_remove_driver(struct device_driver *driver)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_MODULES */
|
|
|
|
#define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
|
|
|
|
/* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
|
|
|
|
#define __MODULE_STRING(x) __stringify(x)
|
|
|
|
#endif /* _LINUX_MODULE_H */
|