576 lines
15 KiB
C
576 lines
15 KiB
C
#ifndef _LINUX_MODULE_H
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#define _LINUX_MODULE_H
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/*
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* Dynamic loading of modules into the kernel.
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*
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* Rewritten by Richard Henderson <rth@tamu.edu> Dec 1996
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* Rewritten again by Rusty Russell, 2002
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*/
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#include <linux/config.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/stat.h>
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#include <linux/compiler.h>
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#include <linux/cache.h>
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#include <linux/kmod.h>
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#include <linux/elf.h>
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#include <linux/stringify.h>
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#include <linux/kobject.h>
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#include <linux/moduleparam.h>
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#include <asm/local.h>
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#include <asm/module.h>
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/* Not Yet Implemented */
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#define MODULE_SUPPORTED_DEVICE(name)
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/* v850 toolchain uses a `_' prefix for all user symbols */
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#ifndef MODULE_SYMBOL_PREFIX
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#define MODULE_SYMBOL_PREFIX ""
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#endif
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#define MODULE_NAME_LEN (64 - sizeof(unsigned long))
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struct kernel_symbol
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{
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unsigned long value;
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const char *name;
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};
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struct modversion_info
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{
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unsigned long crc;
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char name[MODULE_NAME_LEN];
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};
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struct module;
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struct module_attribute {
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struct attribute attr;
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ssize_t (*show)(struct module_attribute *, struct module *, char *);
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ssize_t (*store)(struct module_attribute *, struct module *,
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const char *, size_t count);
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void (*setup)(struct module *, const char *);
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int (*test)(struct module *);
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void (*free)(struct module *);
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};
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struct module_kobject
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{
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struct kobject kobj;
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struct module *mod;
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};
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/* These are either module local, or the kernel's dummy ones. */
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extern int init_module(void);
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extern void cleanup_module(void);
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/* Archs provide a method of finding the correct exception table. */
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struct exception_table_entry;
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const struct exception_table_entry *
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search_extable(const struct exception_table_entry *first,
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const struct exception_table_entry *last,
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unsigned long value);
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void sort_extable(struct exception_table_entry *start,
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struct exception_table_entry *finish);
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void sort_main_extable(void);
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extern struct subsystem module_subsys;
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#ifdef MODULE
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#define MODULE_GENERIC_TABLE(gtype,name) \
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extern const struct gtype##_id __mod_##gtype##_table \
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__attribute__ ((unused, alias(__stringify(name))))
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extern struct module __this_module;
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#define THIS_MODULE (&__this_module)
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#else /* !MODULE */
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#define MODULE_GENERIC_TABLE(gtype,name)
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#define THIS_MODULE ((struct module *)0)
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#endif
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/* Generic info of form tag = "info" */
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#define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
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/* For userspace: you can also call me... */
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#define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
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/*
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* The following license idents are currently accepted as indicating free
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* software modules
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*
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* "GPL" [GNU Public License v2 or later]
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* "GPL v2" [GNU Public License v2]
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* "GPL and additional rights" [GNU Public License v2 rights and more]
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* "Dual BSD/GPL" [GNU Public License v2
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* or BSD license choice]
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* "Dual MPL/GPL" [GNU Public License v2
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* or Mozilla license choice]
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*
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* The following other idents are available
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*
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* "Proprietary" [Non free products]
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*
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* There are dual licensed components, but when running with Linux it is the
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* GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL
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* is a GPL combined work.
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*
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* This exists for several reasons
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* 1. So modinfo can show license info for users wanting to vet their setup
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* is free
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* 2. So the community can ignore bug reports including proprietary modules
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* 3. So vendors can do likewise based on their own policies
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*/
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#define MODULE_LICENSE(_license) MODULE_INFO(license, _license)
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/* Author, ideally of form NAME <EMAIL>[, NAME <EMAIL>]*[ and NAME <EMAIL>] */
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#define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
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/* What your module does. */
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#define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
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/* One for each parameter, describing how to use it. Some files do
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multiple of these per line, so can't just use MODULE_INFO. */
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#define MODULE_PARM_DESC(_parm, desc) \
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__MODULE_INFO(parm, _parm, #_parm ":" desc)
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#define MODULE_DEVICE_TABLE(type,name) \
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MODULE_GENERIC_TABLE(type##_device,name)
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/* Version of form [<epoch>:]<version>[-<extra-version>].
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Or for CVS/RCS ID version, everything but the number is stripped.
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<epoch>: A (small) unsigned integer which allows you to start versions
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anew. If not mentioned, it's zero. eg. "2:1.0" is after
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"1:2.0".
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<version>: The <version> may contain only alphanumerics and the
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character `.'. Ordered by numeric sort for numeric parts,
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ascii sort for ascii parts (as per RPM or DEB algorithm).
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<extraversion>: Like <version>, but inserted for local
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customizations, eg "rh3" or "rusty1".
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Using this automatically adds a checksum of the .c files and the
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local headers in "srcversion".
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*/
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#define MODULE_VERSION(_version) MODULE_INFO(version, _version)
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/* Given an address, look for it in the exception tables */
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const struct exception_table_entry *search_exception_tables(unsigned long add);
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struct notifier_block;
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#ifdef CONFIG_MODULES
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/* Get/put a kernel symbol (calls must be symmetric) */
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void *__symbol_get(const char *symbol);
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void *__symbol_get_gpl(const char *symbol);
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#define symbol_get(x) ((typeof(&x))(__symbol_get(MODULE_SYMBOL_PREFIX #x)))
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#ifndef __GENKSYMS__
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#ifdef CONFIG_MODVERSIONS
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/* Mark the CRC weak since genksyms apparently decides not to
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* generate a checksums for some symbols */
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#define __CRC_SYMBOL(sym, sec) \
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extern void *__crc_##sym __attribute__((weak)); \
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static const unsigned long __kcrctab_##sym \
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__attribute_used__ \
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__attribute__((section("__kcrctab" sec), unused)) \
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= (unsigned long) &__crc_##sym;
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#else
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#define __CRC_SYMBOL(sym, sec)
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#endif
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/* For every exported symbol, place a struct in the __ksymtab section */
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#define __EXPORT_SYMBOL(sym, sec) \
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__CRC_SYMBOL(sym, sec) \
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static const char __kstrtab_##sym[] \
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__attribute__((section("__ksymtab_strings"))) \
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= MODULE_SYMBOL_PREFIX #sym; \
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static const struct kernel_symbol __ksymtab_##sym \
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__attribute_used__ \
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__attribute__((section("__ksymtab" sec), unused)) \
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= { (unsigned long)&sym, __kstrtab_##sym }
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#define EXPORT_SYMBOL(sym) \
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__EXPORT_SYMBOL(sym, "")
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#define EXPORT_SYMBOL_GPL(sym) \
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__EXPORT_SYMBOL(sym, "_gpl")
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#endif
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struct module_ref
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{
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local_t count;
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} ____cacheline_aligned;
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enum module_state
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{
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MODULE_STATE_LIVE,
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MODULE_STATE_COMING,
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MODULE_STATE_GOING,
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};
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/* Similar stuff for section attributes. */
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#define MODULE_SECT_NAME_LEN 32
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struct module_sect_attr
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{
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struct module_attribute mattr;
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char name[MODULE_SECT_NAME_LEN];
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unsigned long address;
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};
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struct module_sect_attrs
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{
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struct attribute_group grp;
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struct module_sect_attr attrs[0];
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};
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struct module_param_attrs;
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struct module
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{
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enum module_state state;
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/* Member of list of modules */
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struct list_head list;
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/* Unique handle for this module */
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char name[MODULE_NAME_LEN];
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/* Sysfs stuff. */
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struct module_kobject mkobj;
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struct module_param_attrs *param_attrs;
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const char *version;
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const char *srcversion;
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/* Exported symbols */
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const struct kernel_symbol *syms;
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unsigned int num_syms;
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const unsigned long *crcs;
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/* GPL-only exported symbols. */
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const struct kernel_symbol *gpl_syms;
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unsigned int num_gpl_syms;
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const unsigned long *gpl_crcs;
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/* Exception table */
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unsigned int num_exentries;
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const struct exception_table_entry *extable;
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/* Startup function. */
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int (*init)(void);
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/* If this is non-NULL, vfree after init() returns */
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void *module_init;
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/* Here is the actual code + data, vfree'd on unload. */
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void *module_core;
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/* Here are the sizes of the init and core sections */
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unsigned long init_size, core_size;
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/* The size of the executable code in each section. */
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unsigned long init_text_size, core_text_size;
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/* Arch-specific module values */
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struct mod_arch_specific arch;
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/* Am I unsafe to unload? */
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int unsafe;
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/* Am I GPL-compatible */
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int license_gplok;
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#ifdef CONFIG_MODULE_UNLOAD
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/* Reference counts */
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struct module_ref ref[NR_CPUS];
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/* What modules depend on me? */
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struct list_head modules_which_use_me;
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/* Who is waiting for us to be unloaded */
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struct task_struct *waiter;
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/* Destruction function. */
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void (*exit)(void);
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#endif
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#ifdef CONFIG_KALLSYMS
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/* We keep the symbol and string tables for kallsyms. */
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Elf_Sym *symtab;
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unsigned long num_symtab;
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char *strtab;
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/* Section attributes */
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struct module_sect_attrs *sect_attrs;
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#endif
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/* Per-cpu data. */
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void *percpu;
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/* The command line arguments (may be mangled). People like
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keeping pointers to this stuff */
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char *args;
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};
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/* FIXME: It'd be nice to isolate modules during init, too, so they
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aren't used before they (may) fail. But presently too much code
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(IDE & SCSI) require entry into the module during init.*/
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static inline int module_is_live(struct module *mod)
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{
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return mod->state != MODULE_STATE_GOING;
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}
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/* Is this address in a module? (second is with no locks, for oops) */
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struct module *module_text_address(unsigned long addr);
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struct module *__module_text_address(unsigned long addr);
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/* Returns module and fills in value, defined and namebuf, or NULL if
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symnum out of range. */
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struct module *module_get_kallsym(unsigned int symnum,
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unsigned long *value,
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char *type,
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char namebuf[128]);
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/* Look for this name: can be of form module:name. */
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unsigned long module_kallsyms_lookup_name(const char *name);
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int is_exported(const char *name, const struct module *mod);
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extern void __module_put_and_exit(struct module *mod, long code)
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__attribute__((noreturn));
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#define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code);
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#ifdef CONFIG_MODULE_UNLOAD
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unsigned int module_refcount(struct module *mod);
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void __symbol_put(const char *symbol);
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#define symbol_put(x) __symbol_put(MODULE_SYMBOL_PREFIX #x)
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void symbol_put_addr(void *addr);
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/* Sometimes we know we already have a refcount, and it's easier not
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to handle the error case (which only happens with rmmod --wait). */
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static inline void __module_get(struct module *module)
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{
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if (module) {
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BUG_ON(module_refcount(module) == 0);
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local_inc(&module->ref[get_cpu()].count);
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put_cpu();
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}
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}
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static inline int try_module_get(struct module *module)
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{
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int ret = 1;
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if (module) {
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unsigned int cpu = get_cpu();
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if (likely(module_is_live(module)))
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local_inc(&module->ref[cpu].count);
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else
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ret = 0;
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put_cpu();
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}
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return ret;
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}
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static inline void module_put(struct module *module)
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{
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if (module) {
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unsigned int cpu = get_cpu();
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local_dec(&module->ref[cpu].count);
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/* Maybe they're waiting for us to drop reference? */
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if (unlikely(!module_is_live(module)))
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wake_up_process(module->waiter);
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put_cpu();
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}
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}
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#else /*!CONFIG_MODULE_UNLOAD*/
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static inline int try_module_get(struct module *module)
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{
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return !module || module_is_live(module);
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}
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static inline void module_put(struct module *module)
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{
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}
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static inline void __module_get(struct module *module)
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{
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}
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#define symbol_put(x) do { } while(0)
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#define symbol_put_addr(p) do { } while(0)
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#endif /* CONFIG_MODULE_UNLOAD */
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/* This is a #define so the string doesn't get put in every .o file */
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#define module_name(mod) \
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({ \
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struct module *__mod = (mod); \
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__mod ? __mod->name : "kernel"; \
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})
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#define __unsafe(mod) \
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do { \
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if (mod && !(mod)->unsafe) { \
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printk(KERN_WARNING \
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"Module %s cannot be unloaded due to unsafe usage in" \
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" %s:%u\n", (mod)->name, __FILE__, __LINE__); \
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(mod)->unsafe = 1; \
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} \
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} while(0)
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/* For kallsyms to ask for address resolution. NULL means not found. */
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const char *module_address_lookup(unsigned long addr,
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unsigned long *symbolsize,
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unsigned long *offset,
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char **modname);
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/* For extable.c to search modules' exception tables. */
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const struct exception_table_entry *search_module_extables(unsigned long addr);
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int register_module_notifier(struct notifier_block * nb);
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int unregister_module_notifier(struct notifier_block * nb);
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extern void print_modules(void);
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struct device_driver;
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void module_add_driver(struct module *, struct device_driver *);
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void module_remove_driver(struct device_driver *);
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#else /* !CONFIG_MODULES... */
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#define EXPORT_SYMBOL(sym)
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#define EXPORT_SYMBOL_GPL(sym)
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/* Given an address, look for it in the exception tables. */
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static inline const struct exception_table_entry *
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search_module_extables(unsigned long addr)
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{
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return NULL;
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}
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/* Is this address in a module? */
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static inline struct module *module_text_address(unsigned long addr)
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{
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return NULL;
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}
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/* Is this address in a module? (don't take a lock, we're oopsing) */
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static inline struct module *__module_text_address(unsigned long addr)
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{
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return NULL;
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}
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/* Get/put a kernel symbol (calls should be symmetric) */
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#define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
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#define symbol_put(x) do { } while(0)
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#define symbol_put_addr(x) do { } while(0)
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static inline void __module_get(struct module *module)
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{
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}
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static inline int try_module_get(struct module *module)
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{
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return 1;
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}
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static inline void module_put(struct module *module)
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{
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}
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#define module_name(mod) "kernel"
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#define __unsafe(mod)
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/* For kallsyms to ask for address resolution. NULL means not found. */
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static inline const char *module_address_lookup(unsigned long addr,
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unsigned long *symbolsize,
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unsigned long *offset,
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char **modname)
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{
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return NULL;
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}
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static inline struct module *module_get_kallsym(unsigned int symnum,
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unsigned long *value,
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char *type,
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char namebuf[128])
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{
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return NULL;
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}
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static inline unsigned long module_kallsyms_lookup_name(const char *name)
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{
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return 0;
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}
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static inline int is_exported(const char *name, const struct module *mod)
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{
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return 0;
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}
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static inline int register_module_notifier(struct notifier_block * nb)
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{
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/* no events will happen anyway, so this can always succeed */
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return 0;
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}
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static inline int unregister_module_notifier(struct notifier_block * nb)
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{
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return 0;
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}
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#define module_put_and_exit(code) do_exit(code)
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static inline void print_modules(void)
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{
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}
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struct device_driver;
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struct module;
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static inline void module_add_driver(struct module *module, struct device_driver *driver)
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{
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}
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static inline void module_remove_driver(struct device_driver *driver)
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{
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}
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#endif /* CONFIG_MODULES */
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#define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
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/* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
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struct obsolete_modparm {
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char name[64];
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char type[64-sizeof(void *)];
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void *addr;
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};
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static inline void MODULE_PARM_(void) { }
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#ifdef MODULE
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/* DEPRECATED: Do not use. */
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#define MODULE_PARM(var,type) \
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struct obsolete_modparm __parm_##var __attribute__((section("__obsparm"))) = \
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{ __stringify(var), type, &MODULE_PARM_ }; \
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__MODULE_PARM_TYPE(var, type);
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#else
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#define MODULE_PARM(var,type) static void __attribute__((__unused__)) *__parm_##var = &MODULE_PARM_;
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#endif
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#define __MODULE_STRING(x) __stringify(x)
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/* Use symbol_get and symbol_put instead. You'll thank me. */
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#define HAVE_INTER_MODULE
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extern void __deprecated inter_module_register(const char *,
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struct module *, const void *);
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extern void __deprecated inter_module_unregister(const char *);
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extern const void * __deprecated inter_module_get_request(const char *,
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const char *);
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extern void __deprecated inter_module_put(const char *);
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#endif /* _LINUX_MODULE_H */
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