#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 <asm/local.h>
#include <asm/module.h>

#include <trace/events/module.h>

/* Not Yet Implemented */
#define MODULE_SUPPORTED_DEVICE(name)

/* some toolchains uses a `_' prefix for all user symbols */
#ifndef MODULE_SYMBOL_PREFIX
#define MODULE_SYMBOL_PREFIX ""
#endif

#define MODULE_NAME_LEN MAX_PARAM_PREFIX_LEN

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;
        struct kobject *drivers_dir;
        struct module_param_attrs *mp;
};

/* 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);
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))))

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(s), use "Name <email>" or just "Name", for multiple
 * authors use multiple MODULE_AUTHOR() statements/lines.
 */
#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              \
        __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"), aligned(1))) \
        = MODULE_SYMBOL_PREFIX #sym;                            \
        static const struct kernel_symbol __ksymtab_##sym       \
        __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

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];

        /* Sysfs stuff. */
        struct module_kobject mkobj;
        struct module_attribute *modinfo_attrs;
        const char *version;
        const char *srcversion;
        struct kobject *holders_dir;

        /* Exported symbols */
        const struct kernel_symbol *syms;
        const unsigned long *crcs;
        unsigned int num_syms;

        /* Kernel parameters. */
        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
        /* unused exported 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;

        /* Exception table */
        unsigned int num_exentries;
        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 int init_size, core_size;

        /* The size of the executable code in each section.  */
        unsigned int init_text_size, core_text_size;

        /* Arch-specific module values */
        struct mod_arch_specific arch;

        unsigned int taints;    /* same bits as kernel:tainted */

#ifdef CONFIG_GENERIC_BUG
        /* Support for BUG */
        unsigned num_bugs;
        struct list_head bug_list;
        struct bug_entry *bug_table;
#endif

#ifdef CONFIG_KALLSYMS
        /*
         * We keep the symbol and string tables for kallsyms.
         * The core_* fields below are temporary, loader-only (they
         * could really be discarded after module init).
         */
        Elf_Sym *symtab, *core_symtab;
        unsigned int num_symtab, core_num_syms;
        char *strtab, *core_strtab;

        /* Section attributes */
        struct module_sect_attrs *sect_attrs;

        /* Notes attributes */
        struct module_notes_attrs *notes_attrs;
#endif

        /* Per-cpu data. */
        void *percpu;

        /* The command line arguments (may be mangled).  People like
           keeping pointers to this stuff */
        char *args;
#ifdef CONFIG_TRACEPOINTS
        struct tracepoint *tracepoints;
        unsigned int num_tracepoints;
#endif

#ifdef CONFIG_TRACING
        const char **trace_bprintk_fmt_start;
        unsigned int num_trace_bprintk_fmt;
#endif
#ifdef CONFIG_EVENT_TRACING
        struct ftrace_event_call *trace_events;
        unsigned int num_trace_events;
#endif
#ifdef CONFIG_FTRACE_MCOUNT_RECORD
        unsigned long *ftrace_callsites;
        unsigned int num_ftrace_callsites;
#endif

#ifdef CONFIG_MODULE_UNLOAD
        /* 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);

#ifdef CONFIG_SMP
        char *refptr;
#else
        local_t ref;
#endif
#endif

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

extern struct mutex module_mutex;

/* 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;
}

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_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;
}

/* Search for module by name: must hold module_mutex. */
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;
};

/* Search for an exported symbol by name. */
const struct kernel_symbol *find_symbol(const char *name,
                                        struct module **owner,
                                        const unsigned long **crc,
                                        bool gplok,
                                        bool warn);

/* Walk the exported symbol table */
bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
                            unsigned int symnum, void *data), void *data);

/* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
   symnum out of range. */
int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
                        char *name, char *module_name, int *exported);

/* Look for this name: can be of form module:name. */
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 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);

static inline local_t *__module_ref_addr(struct module *mod, int cpu)
{
#ifdef CONFIG_SMP
        return (local_t *) (mod->refptr + per_cpu_offset(cpu));
#else
        return &mod->ref;
#endif
}

/* 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) {
                unsigned int cpu = get_cpu();
                local_inc(__module_ref_addr(module, cpu));
                trace_module_get(module, _THIS_IP_,
                                 local_read(__module_ref_addr(module, cpu)));
                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_addr(module, cpu));
                        trace_module_get(module, _THIS_IP_,
                                local_read(__module_ref_addr(module, cpu)));
                }
                else
                        ret = 0;
                put_cpu();
        }
        return ret;
}

extern void module_put(struct module *module);

#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 */
int use_module(struct module *a, struct module *b);

/* 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";         \
})

/* For kallsyms to ask for address resolution.  namebuf should be at
 * least KSYM_NAME_LEN long: a pointer to namebuf is returned if
 * found, otherwise NULL. */
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);

/* 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);

extern void module_update_tracepoints(void);
extern int module_get_iter_tracepoints(struct tracepoint_iter *iter);

#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;
}

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_text_address(unsigned long addr)
{
        return false;
}

/* 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"

/* 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,
                                          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)
{
        /* 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)
{
}

static inline void module_update_tracepoints(void)
{
}

static inline int module_get_iter_tracepoints(struct tracepoint_iter *iter)
{
        return 0;
}

#endif /* CONFIG_MODULES */

struct device_driver;
#ifdef CONFIG_SYSFS
struct module;

extern struct kset *module_kset;
extern struct kobj_type module_ktype;
extern int module_sysfs_initialized;

int mod_sysfs_init(struct module *mod);
int mod_sysfs_setup(struct module *mod,
                           struct kernel_param *kparam,
                           unsigned int num_params);
int module_add_modinfo_attrs(struct module *mod);
void module_remove_modinfo_attrs(struct module *mod);

#else /* !CONFIG_SYSFS */

static inline int mod_sysfs_init(struct module *mod)
{
        return 0;
}

static inline int mod_sysfs_setup(struct module *mod,
                           struct kernel_param *kparam,
                           unsigned int num_params)
{
        return 0;
}

static inline int module_add_modinfo_attrs(struct module *mod)
{
        return 0;
}

static inline void module_remove_modinfo_attrs(struct module *mod)
{ }

#endif /* CONFIG_SYSFS */

#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)


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

#else   /* !CONFIG_GENERIC_BUG */

static inline int  module_bug_finalize(const Elf_Ehdr *hdr,
                                        const Elf_Shdr *sechdrs,
                                        struct module *mod)
{
        return 0;
}
static inline void module_bug_cleanup(struct module *mod) {}
#endif  /* CONFIG_GENERIC_BUG */

#endif /* _LINUX_MODULE_H */