include/linux/module.h

   1 #ifndef _LINUX_MODULE_H
   2 #define _LINUX_MODULE_H
   3 /*
   4  * Dynamic loading of modules into the kernel.
   5  *
   6  * Rewritten by Richard Henderson <rth@tamu.edu> Dec 1996
   7  * Rewritten again by Rusty Russell, 2002
   8  */
   9 #include <linux/list.h>
  10 #include <linux/stat.h>
  11 #include <linux/compiler.h>
  12 #include <linux/cache.h>
  13 #include <linux/kmod.h>
  14 #include <linux/init.h>
  15 #include <linux/elf.h>
  16 #include <linux/stringify.h>
  17 #include <linux/kobject.h>
  18 #include <linux/moduleparam.h>
  19 #include <linux/jump_label.h>
  20 #include <linux/export.h>
  21 #include <linux/rbtree_latch.h>
  22 #include <linux/error-injection.h>
  23 #include <linux/tracepoint-defs.h>
  24
  25 #include <linux/percpu.h>
  26 #include <asm/module.h>
  27
  28 /* In stripped ARM and x86-64 modules, ~ is surprisingly rare. */
  29 #define MODULE_SIG_STRING "~Module signature appended~\n"
  30
  31 /* Not Yet Implemented */
  32 #define MODULE_SUPPORTED_DEVICE(name)
  33
  34 #define MODULE_NAME_LEN MAX_PARAM_PREFIX_LEN
  35
  36 struct modversion_info {
  37         unsigned long crc;
  38         char name[MODULE_NAME_LEN];
  39 };
  40
  41 struct module;
  42 struct exception_table_entry;
  43
  44 struct module_kobject {
  45         struct kobject kobj;
  46         struct module *mod;
  47         struct kobject *drivers_dir;
  48         struct module_param_attrs *mp;
  49         struct completion *kobj_completion;
  50 } __randomize_layout;
  51
  52 struct module_attribute {
  53         struct attribute attr;
  54         ssize_t (*show)(struct module_attribute *, struct module_kobject *,
  55                         char *);
  56         ssize_t (*store)(struct module_attribute *, struct module_kobject *,
  57                          const char *, size_t count);
  58         void (*setup)(struct module *, const char *);
  59         int (*test)(struct module *);
  60         void (*free)(struct module *);
  61 };
  62
  63 struct module_version_attribute {
  64         struct module_attribute mattr;
  65         const char *module_name;
  66         const char *version;
  67 } __attribute__ ((__aligned__(sizeof(void *))));
  68
  69 extern ssize_t __modver_version_show(struct module_attribute *,
  70                                      struct module_kobject *, char *);
  71
  72 extern struct module_attribute module_uevent;
  73
  74 /* These are either module local, or the kernel's dummy ones. */
  75 extern int init_module(void);
  76 extern void cleanup_module(void);
  77
  78 #ifndef MODULE
  79 /**
  80  * module_init() - driver initialization entry point
  81  * @x: function to be run at kernel boot time or module insertion
  82  *
  83  * module_init() will either be called during do_initcalls() (if
  84  * builtin) or at module insertion time (if a module).  There can only
  85  * be one per module.
  86  */
  87 #define module_init(x)  __initcall(x);
  88
  89 /**
  90  * module_exit() - driver exit entry point
  91  * @x: function to be run when driver is removed
  92  *
  93  * module_exit() will wrap the driver clean-up code
  94  * with cleanup_module() when used with rmmod when
  95  * the driver is a module.  If the driver is statically
  96  * compiled into the kernel, module_exit() has no effect.
  97  * There can only be one per module.
  98  */
  99 #define module_exit(x)  __exitcall(x);
 100
 101 #else /* MODULE */
 102
 103 /*
 104  * In most cases loadable modules do not need custom
 105  * initcall levels. There are still some valid cases where
 106  * a driver may be needed early if built in, and does not
 107  * matter when built as a loadable module. Like bus
 108  * snooping debug drivers.
 109  */
 110 #define early_initcall(fn)              module_init(fn)
 111 #define core_initcall(fn)               module_init(fn)
 112 #define core_initcall_sync(fn)          module_init(fn)
 113 #define postcore_initcall(fn)           module_init(fn)
 114 #define postcore_initcall_sync(fn)      module_init(fn)
 115 #define arch_initcall(fn)               module_init(fn)
 116 #define subsys_initcall(fn)             module_init(fn)
 117 #define subsys_initcall_sync(fn)        module_init(fn)
 118 #define fs_initcall(fn)                 module_init(fn)
 119 #define fs_initcall_sync(fn)            module_init(fn)
 120 #define rootfs_initcall(fn)             module_init(fn)
 121 #define device_initcall(fn)             module_init(fn)
 122 #define device_initcall_sync(fn)        module_init(fn)
 123 #define late_initcall(fn)               module_init(fn)
 124 #define late_initcall_sync(fn)          module_init(fn)
 125
 126 #define console_initcall(fn)            module_init(fn)
 127
 128 /* Each module must use one module_init(). */
 129 #define module_init(initfn)                                     \
 130         static inline initcall_t __maybe_unused __inittest(void)                \
 131         { return initfn; }                                      \
 132         int init_module(void) __copy(initfn) __attribute__((alias(#initfn)));
 133
 134 /* This is only required if you want to be unloadable. */
 135 #define module_exit(exitfn)                                     \
 136         static inline exitcall_t __maybe_unused __exittest(void)                \
 137         { return exitfn; }                                      \
 138         void cleanup_module(void) __copy(exitfn) __attribute__((alias(#exitfn)));
 139
 140 #endif
 141
 142 /* This means "can be init if no module support, otherwise module load
 143    may call it." */
 144 #ifdef CONFIG_MODULES
 145 #define __init_or_module
 146 #define __initdata_or_module
 147 #define __initconst_or_module
 148 #define __INIT_OR_MODULE        .text
 149 #define __INITDATA_OR_MODULE    .data
 150 #define __INITRODATA_OR_MODULE  .section ".rodata","a",%progbits
 151 #else
 152 #define __init_or_module __init
 153 #define __initdata_or_module __initdata
 154 #define __initconst_or_module __initconst
 155 #define __INIT_OR_MODULE __INIT
 156 #define __INITDATA_OR_MODULE __INITDATA
 157 #define __INITRODATA_OR_MODULE __INITRODATA
 158 #endif /*CONFIG_MODULES*/
 159
 160 /* Generic info of form tag = "info" */
 161 #define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
 162
 163 /* For userspace: you can also call me... */
 164 #define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
 165
 166 /* Soft module dependencies. See man modprobe.d for details.
 167  * Example: MODULE_SOFTDEP("pre: module-foo module-bar post: module-baz")
 168  */
 169 #define MODULE_SOFTDEP(_softdep) MODULE_INFO(softdep, _softdep)
 170
 171 /*
 172  * The following license idents are currently accepted as indicating free
 173  * software modules
 174  *
 175  *      "GPL"                           [GNU Public License v2]
 176  *      "GPL v2"                        [GNU Public License v2]
 177  *      "GPL and additional rights"     [GNU Public License v2 rights and more]
 178  *      "Dual BSD/GPL"                  [GNU Public License v2
 179  *                                       or BSD license choice]
 180  *      "Dual MIT/GPL"                  [GNU Public License v2
 181  *                                       or MIT license choice]
 182  *      "Dual MPL/GPL"                  [GNU Public License v2
 183  *                                       or Mozilla license choice]
 184  *
 185  * The following other idents are available
 186  *
 187  *      "Proprietary"                   [Non free products]
 188  *
 189  * Both "GPL v2" and "GPL" (the latter also in dual licensed strings) are
 190  * merely stating that the module is licensed under the GPL v2, but are not
 191  * telling whether "GPL v2 only" or "GPL v2 or later". The reason why there
 192  * are two variants is a historic and failed attempt to convey more
 193  * information in the MODULE_LICENSE string. For module loading the
 194  * "only/or later" distinction is completely irrelevant and does neither
 195  * replace the proper license identifiers in the corresponding source file
 196  * nor amends them in any way. The sole purpose is to make the
 197  * 'Proprietary' flagging work and to refuse to bind symbols which are
 198  * exported with EXPORT_SYMBOL_GPL when a non free module is loaded.
 199  *
 200  * In the same way "BSD" is not a clear license information. It merely
 201  * states, that the module is licensed under one of the compatible BSD
 202  * license variants. The detailed and correct license information is again
 203  * to be found in the corresponding source files.
 204  *
 205  * There are dual licensed components, but when running with Linux it is the
 206  * GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL
 207  * is a GPL combined work.
 208  *
 209  * This exists for several reasons
 210  * 1.   So modinfo can show license info for users wanting to vet their setup
 211  *      is free
 212  * 2.   So the community can ignore bug reports including proprietary modules
 213  * 3.   So vendors can do likewise based on their own policies
 214  */
 215 #define MODULE_LICENSE(_license) MODULE_INFO(license, _license)
 216
 217 /*
 218  * Author(s), use "Name <email>" or just "Name", for multiple
 219  * authors use multiple MODULE_AUTHOR() statements/lines.
 220  */
 221 #define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
 222
 223 /* What your module does. */
 224 #define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
 225
 226 #ifdef MODULE
 227 /* Creates an alias so file2alias.c can find device table. */
 228 #define MODULE_DEVICE_TABLE(type, name)                                 \
 229 extern typeof(name) __mod_##type##__##name##_device_table               \
 230   __attribute__ ((unused, alias(__stringify(name))))
 231 #else  /* !MODULE */
 232 #define MODULE_DEVICE_TABLE(type, name)
 233 #endif
 234
 235 /* Version of form [<epoch>:]<version>[-<extra-version>].
 236  * Or for CVS/RCS ID version, everything but the number is stripped.
 237  * <epoch>: A (small) unsigned integer which allows you to start versions
 238  * anew. If not mentioned, it's zero.  eg. "2:1.0" is after
 239  * "1:2.0".
 240
 241  * <version>: The <version> may contain only alphanumerics and the
 242  * character `.'.  Ordered by numeric sort for numeric parts,
 243  * ascii sort for ascii parts (as per RPM or DEB algorithm).
 244
 245  * <extraversion>: Like <version>, but inserted for local
 246  * customizations, eg "rh3" or "rusty1".
 247
 248  * Using this automatically adds a checksum of the .c files and the
 249  * local headers in "srcversion".
 250  */
 251
 252 #if defined(MODULE) || !defined(CONFIG_SYSFS)
 253 #define MODULE_VERSION(_version) MODULE_INFO(version, _version)
 254 #else
 255 #define MODULE_VERSION(_version)                                        \
 256         MODULE_INFO(version, _version);                                 \
 257         static struct module_version_attribute ___modver_attr = {       \
 258                 .mattr  = {                                             \
 259                         .attr   = {                                     \
 260                                 .name   = "version",                    \
 261                                 .mode   = S_IRUGO,                      \
 262                         },                                              \
 263                         .show   = __modver_version_show,                \
 264                 },                                                      \
 265                 .module_name    = KBUILD_MODNAME,                       \
 266                 .version        = _version,                             \
 267         };                                                              \
 268         static const struct module_version_attribute                    \
 269         __used __attribute__ ((__section__ ("__modver")))               \
 270         * __moduleparam_const __modver_attr = &___modver_attr
 271 #endif
 272
 273 /* Optional firmware file (or files) needed by the module
 274  * format is simply firmware file name.  Multiple firmware
 275  * files require multiple MODULE_FIRMWARE() specifiers */
 276 #define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
 277
 278 struct notifier_block;
 279
 280 #ifdef CONFIG_MODULES
 281
 282 extern int modules_disabled; /* for sysctl */
 283 /* Get/put a kernel symbol (calls must be symmetric) */
 284 void *__symbol_get(const char *symbol);
 285 void *__symbol_get_gpl(const char *symbol);
 286 #define symbol_get(x) ((typeof(&x))(__symbol_get(__stringify(x))))
 287
 288 /* modules using other modules: kdb wants to see this. */
 289 struct module_use {
 290         struct list_head source_list;
 291         struct list_head target_list;
 292         struct module *source, *target;
 293 };
 294
 295 enum module_state {
 296         MODULE_STATE_LIVE,      /* Normal state. */
 297         MODULE_STATE_COMING,    /* Full formed, running module_init. */
 298         MODULE_STATE_GOING,     /* Going away. */
 299         MODULE_STATE_UNFORMED,  /* Still setting it up. */
 300 };
 301
 302 struct mod_tree_node {
 303         struct module *mod;
 304         struct latch_tree_node node;
 305 };
 306
 307 struct module_layout {
 308         /* The actual code + data. */
 309         void *base;
 310         /* Total size. */
 311         unsigned int size;
 312         /* The size of the executable code.  */
 313         unsigned int text_size;
 314         /* Size of RO section of the module (text+rodata) */
 315         unsigned int ro_size;
 316         /* Size of RO after init section */
 317         unsigned int ro_after_init_size;
 318
 319 #ifdef CONFIG_MODULES_TREE_LOOKUP
 320         struct mod_tree_node mtn;
 321 #endif
 322 };
 323
 324 #ifdef CONFIG_MODULES_TREE_LOOKUP
 325 /* Only touch one cacheline for common rbtree-for-core-layout case. */
 326 #define __module_layout_align ____cacheline_aligned
 327 #else
 328 #define __module_layout_align
 329 #endif
 330
 331 struct mod_kallsyms {
 332         Elf_Sym *symtab;
 333         unsigned int num_symtab;
 334         char *strtab;
 335 };
 336
 337 #ifdef CONFIG_LIVEPATCH
 338 struct klp_modinfo {
 339         Elf_Ehdr hdr;
 340         Elf_Shdr *sechdrs;
 341         char *secstrings;
 342         unsigned int symndx;
 343 };
 344 #endif
 345
 346 struct module {
 347         enum module_state state;
 348
 349         /* Member of list of modules */
 350         struct list_head list;
 351
 352         /* Unique handle for this module */
 353         char name[MODULE_NAME_LEN];
 354
 355         /* Sysfs stuff. */
 356         struct module_kobject mkobj;
 357         struct module_attribute *modinfo_attrs;
 358         const char *version;
 359         const char *srcversion;
 360         struct kobject *holders_dir;
 361
 362         /* Exported symbols */
 363         const struct kernel_symbol *syms;
 364         const s32 *crcs;
 365         unsigned int num_syms;
 366
 367         /* Kernel parameters. */
 368 #ifdef CONFIG_SYSFS
 369         struct mutex param_lock;
 370 #endif
 371         struct kernel_param *kp;
 372         unsigned int num_kp;
 373
 374         /* GPL-only exported symbols. */
 375         unsigned int num_gpl_syms;
 376         const struct kernel_symbol *gpl_syms;
 377         const s32 *gpl_crcs;
 378
 379 #ifdef CONFIG_UNUSED_SYMBOLS
 380         /* unused exported symbols. */
 381         const struct kernel_symbol *unused_syms;
 382         const s32 *unused_crcs;
 383         unsigned int num_unused_syms;
 384
 385         /* GPL-only, unused exported symbols. */
 386         unsigned int num_unused_gpl_syms;
 387         const struct kernel_symbol *unused_gpl_syms;
 388         const s32 *unused_gpl_crcs;
 389 #endif
 390
 391 #ifdef CONFIG_MODULE_SIG
 392         /* Signature was verified. */
 393         bool sig_ok;
 394 #endif
 395
 396         bool async_probe_requested;
 397
 398         /* symbols that will be GPL-only in the near future. */
 399         const struct kernel_symbol *gpl_future_syms;
 400         const s32 *gpl_future_crcs;
 401         unsigned int num_gpl_future_syms;
 402
 403         /* Exception table */
 404         unsigned int num_exentries;
 405         struct exception_table_entry *extable;
 406
 407         /* Startup function. */
 408         int (*init)(void);
 409
 410         /* Core layout: rbtree is accessed frequently, so keep together. */
 411         struct module_layout core_layout __module_layout_align;
 412         struct module_layout init_layout;
 413
 414         /* Arch-specific module values */
 415         struct mod_arch_specific arch;
 416
 417         unsigned long taints;   /* same bits as kernel:taint_flags */
 418
 419 #ifdef CONFIG_GENERIC_BUG
 420         /* Support for BUG */
 421         unsigned num_bugs;
 422         struct list_head bug_list;
 423         struct bug_entry *bug_table;
 424 #endif
 425
 426 #ifdef CONFIG_KALLSYMS
 427         /* Protected by RCU and/or module_mutex: use rcu_dereference() */
 428         struct mod_kallsyms *kallsyms;
 429         struct mod_kallsyms core_kallsyms;
 430
 431         /* Section attributes */
 432         struct module_sect_attrs *sect_attrs;
 433
 434         /* Notes attributes */
 435         struct module_notes_attrs *notes_attrs;
 436 #endif
 437
 438         /* The command line arguments (may be mangled).  People like
 439            keeping pointers to this stuff */
 440         char *args;
 441
 442 #ifdef CONFIG_SMP
 443         /* Per-cpu data. */
 444         void __percpu *percpu;
 445         unsigned int percpu_size;
 446 #endif
 447
 448 #ifdef CONFIG_TRACEPOINTS
 449         unsigned int num_tracepoints;
 450         tracepoint_ptr_t *tracepoints_ptrs;
 451 #endif
 452 #ifdef CONFIG_BPF_EVENTS
 453         unsigned int num_bpf_raw_events;
 454         struct bpf_raw_event_map *bpf_raw_events;
 455 #endif
 456 #ifdef CONFIG_JUMP_LABEL
 457         struct jump_entry *jump_entries;
 458         unsigned int num_jump_entries;
 459 #endif
 460 #ifdef CONFIG_TRACING
 461         unsigned int num_trace_bprintk_fmt;
 462         const char **trace_bprintk_fmt_start;
 463 #endif
 464 #ifdef CONFIG_EVENT_TRACING
 465         struct trace_event_call **trace_events;
 466         unsigned int num_trace_events;
 467         struct trace_eval_map **trace_evals;
 468         unsigned int num_trace_evals;
 469 #endif
 470 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 471         unsigned int num_ftrace_callsites;
 472         unsigned long *ftrace_callsites;
 473 #endif
 474
 475 #ifdef CONFIG_LIVEPATCH
 476         bool klp; /* Is this a livepatch module? */
 477         bool klp_alive;
 478
 479         /* Elf information */
 480         struct klp_modinfo *klp_info;
 481 #endif
 482
 483 #ifdef CONFIG_MODULE_UNLOAD
 484         /* What modules depend on me? */
 485         struct list_head source_list;
 486         /* What modules do I depend on? */
 487         struct list_head target_list;
 488
 489         /* Destruction function. */
 490         void (*exit)(void);
 491
 492         atomic_t refcnt;
 493 #endif
 494
 495 #ifdef CONFIG_CONSTRUCTORS
 496         /* Constructor functions. */
 497         ctor_fn_t *ctors;
 498         unsigned int num_ctors;
 499 #endif
 500
 501 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
 502         struct error_injection_entry *ei_funcs;
 503         unsigned int num_ei_funcs;
 504 #endif
 505 } ____cacheline_aligned __randomize_layout;
 506 #ifndef MODULE_ARCH_INIT
 507 #define MODULE_ARCH_INIT {}
 508 #endif
 509
 510 #ifndef HAVE_ARCH_KALLSYMS_SYMBOL_VALUE
 511 static inline unsigned long kallsyms_symbol_value(const Elf_Sym *sym)
 512 {
 513         return sym->st_value;
 514 }
 515 #endif
 516
 517 extern struct mutex module_mutex;
 518
 519 /* FIXME: It'd be nice to isolate modules during init, too, so they
 520    aren't used before they (may) fail.  But presently too much code
 521    (IDE & SCSI) require entry into the module during init.*/
 522 static inline bool module_is_live(struct module *mod)
 523 {
 524         return mod->state != MODULE_STATE_GOING;
 525 }
 526
 527 struct module *__module_text_address(unsigned long addr);
 528 struct module *__module_address(unsigned long addr);
 529 bool is_module_address(unsigned long addr);
 530 bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr);
 531 bool is_module_percpu_address(unsigned long addr);
 532 bool is_module_text_address(unsigned long addr);
 533
 534 static inline bool within_module_core(unsigned long addr,
 535                                       const struct module *mod)
 536 {
 537         return (unsigned long)mod->core_layout.base <= addr &&
 538                addr < (unsigned long)mod->core_layout.base + mod->core_layout.size;
 539 }
 540
 541 static inline bool within_module_init(unsigned long addr,
 542                                       const struct module *mod)
 543 {
 544         return (unsigned long)mod->init_layout.base <= addr &&
 545                addr < (unsigned long)mod->init_layout.base + mod->init_layout.size;
 546 }
 547
 548 static inline bool within_module(unsigned long addr, const struct module *mod)
 549 {
 550         return within_module_init(addr, mod) || within_module_core(addr, mod);
 551 }
 552
 553 /* Search for module by name: must hold module_mutex. */
 554 struct module *find_module(const char *name);
 555
 556 struct symsearch {
 557         const struct kernel_symbol *start, *stop;
 558         const s32 *crcs;
 559         enum {
 560                 NOT_GPL_ONLY,
 561                 GPL_ONLY,
 562                 WILL_BE_GPL_ONLY,
 563         } licence;
 564         bool unused;
 565 };
 566
 567 /*
 568  * Search for an exported symbol by name.
 569  *
 570  * Must be called with module_mutex held or preemption disabled.
 571  */
 572 const struct kernel_symbol *find_symbol(const char *name,
 573                                         struct module **owner,
 574                                         const s32 **crc,
 575                                         bool gplok,
 576                                         bool warn);
 577
 578 /*
 579  * Walk the exported symbol table
 580  *
 581  * Must be called with module_mutex held or preemption disabled.
 582  */
 583 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
 584                                     struct module *owner,
 585                                     void *data), void *data);
 586
 587 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
 588    symnum out of range. */
 589 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
 590                         char *name, char *module_name, int *exported);
 591
 592 /* Look for this name: can be of form module:name. */
 593 unsigned long module_kallsyms_lookup_name(const char *name);
 594
 595 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 596                                              struct module *, unsigned long),
 597                                    void *data);
 598
 599 extern void __noreturn __module_put_and_exit(struct module *mod,
 600                         long code);
 601 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code)
 602
 603 #ifdef CONFIG_MODULE_UNLOAD
 604 int module_refcount(struct module *mod);
 605 void __symbol_put(const char *symbol);
 606 #define symbol_put(x) __symbol_put(__stringify(x))
 607 void symbol_put_addr(void *addr);
 608
 609 /* Sometimes we know we already have a refcount, and it's easier not
 610    to handle the error case (which only happens with rmmod --wait). */
 611 extern void __module_get(struct module *module);
 612
 613 /* This is the Right Way to get a module: if it fails, it's being removed,
 614  * so pretend it's not there. */
 615 extern bool try_module_get(struct module *module);
 616
 617 extern void module_put(struct module *module);
 618
 619 #else /*!CONFIG_MODULE_UNLOAD*/
 620 static inline bool try_module_get(struct module *module)
 621 {
 622         return !module || module_is_live(module);
 623 }
 624 static inline void module_put(struct module *module)
 625 {
 626 }
 627 static inline void __module_get(struct module *module)
 628 {
 629 }
 630 #define symbol_put(x) do { } while (0)
 631 #define symbol_put_addr(p) do { } while (0)
 632
 633 #endif /* CONFIG_MODULE_UNLOAD */
 634 int ref_module(struct module *a, struct module *b);
 635
 636 /* This is a #define so the string doesn't get put in every .o file */
 637 #define module_name(mod)                        \
 638 ({                                              \
 639         struct module *__mod = (mod);           \
 640         __mod ? __mod->name : "kernel";         \
 641 })
 642
 643 /* Dereference module function descriptor */
 644 void *dereference_module_function_descriptor(struct module *mod, void *ptr);
 645
 646 /* For kallsyms to ask for address resolution.  namebuf should be at
 647  * least KSYM_NAME_LEN long: a pointer to namebuf is returned if
 648  * found, otherwise NULL. */
 649 const char *module_address_lookup(unsigned long addr,
 650                             unsigned long *symbolsize,
 651                             unsigned long *offset,
 652                             char **modname,
 653                             char *namebuf);
 654 int lookup_module_symbol_name(unsigned long addr, char *symname);
 655 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
 656
 657 int register_module_notifier(struct notifier_block *nb);
 658 int unregister_module_notifier(struct notifier_block *nb);
 659
 660 extern void print_modules(void);
 661
 662 static inline bool module_requested_async_probing(struct module *module)
 663 {
 664         return module && module->async_probe_requested;
 665 }
 666
 667 #ifdef CONFIG_LIVEPATCH
 668 static inline bool is_livepatch_module(struct module *mod)
 669 {
 670         return mod->klp;
 671 }
 672 #else /* !CONFIG_LIVEPATCH */
 673 static inline bool is_livepatch_module(struct module *mod)
 674 {
 675         return false;
 676 }
 677 #endif /* CONFIG_LIVEPATCH */
 678
 679 bool is_module_sig_enforced(void);
 680
 681 #else /* !CONFIG_MODULES... */
 682
 683 static inline struct module *__module_address(unsigned long addr)
 684 {
 685         return NULL;
 686 }
 687
 688 static inline struct module *__module_text_address(unsigned long addr)
 689 {
 690         return NULL;
 691 }
 692
 693 static inline bool is_module_address(unsigned long addr)
 694 {
 695         return false;
 696 }
 697
 698 static inline bool is_module_percpu_address(unsigned long addr)
 699 {
 700         return false;
 701 }
 702
 703 static inline bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
 704 {
 705         return false;
 706 }
 707
 708 static inline bool is_module_text_address(unsigned long addr)
 709 {
 710         return false;
 711 }
 712
 713 /* Get/put a kernel symbol (calls should be symmetric) */
 714 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
 715 #define symbol_put(x) do { } while (0)
 716 #define symbol_put_addr(x) do { } while (0)
 717
 718 static inline void __module_get(struct module *module)
 719 {
 720 }
 721
 722 static inline bool try_module_get(struct module *module)
 723 {
 724         return true;
 725 }
 726
 727 static inline void module_put(struct module *module)
 728 {
 729 }
 730
 731 #define module_name(mod) "kernel"
 732
 733 /* For kallsyms to ask for address resolution.  NULL means not found. */
 734 static inline const char *module_address_lookup(unsigned long addr,
 735                                           unsigned long *symbolsize,
 736                                           unsigned long *offset,
 737                                           char **modname,
 738                                           char *namebuf)
 739 {
 740         return NULL;
 741 }
 742
 743 static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
 744 {
 745         return -ERANGE;
 746 }
 747
 748 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
 749 {
 750         return -ERANGE;
 751 }
 752
 753 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
 754                                         char *type, char *name,
 755                                         char *module_name, int *exported)
 756 {
 757         return -ERANGE;
 758 }
 759
 760 static inline unsigned long module_kallsyms_lookup_name(const char *name)
 761 {
 762         return 0;
 763 }
 764
 765 static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 766                                                            struct module *,
 767                                                            unsigned long),
 768                                                  void *data)
 769 {
 770         return 0;
 771 }
 772
 773 static inline int register_module_notifier(struct notifier_block *nb)
 774 {
 775         /* no events will happen anyway, so this can always succeed */
 776         return 0;
 777 }
 778
 779 static inline int unregister_module_notifier(struct notifier_block *nb)
 780 {
 781         return 0;
 782 }
 783
 784 #define module_put_and_exit(code) do_exit(code)
 785
 786 static inline void print_modules(void)
 787 {
 788 }
 789
 790 static inline bool module_requested_async_probing(struct module *module)
 791 {
 792         return false;
 793 }
 794
 795 static inline bool is_module_sig_enforced(void)
 796 {
 797         return false;
 798 }
 799
 800 /* Dereference module function descriptor */
 801 static inline
 802 void *dereference_module_function_descriptor(struct module *mod, void *ptr)
 803 {
 804         return ptr;
 805 }
 806
 807 #endif /* CONFIG_MODULES */
 808
 809 #ifdef CONFIG_SYSFS
 810 extern struct kset *module_kset;
 811 extern struct kobj_type module_ktype;
 812 extern int module_sysfs_initialized;
 813 #endif /* CONFIG_SYSFS */
 814
 815 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
 816
 817 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
 818
 819 #define __MODULE_STRING(x) __stringify(x)
 820
 821 #ifdef CONFIG_STRICT_MODULE_RWX
 822 extern void set_all_modules_text_rw(void);
 823 extern void set_all_modules_text_ro(void);
 824 extern void module_enable_ro(const struct module *mod, bool after_init);
 825 extern void module_disable_ro(const struct module *mod);
 826 #else
 827 static inline void set_all_modules_text_rw(void) { }
 828 static inline void set_all_modules_text_ro(void) { }
 829 static inline void module_enable_ro(const struct module *mod, bool after_init) { }
 830 static inline void module_disable_ro(const struct module *mod) { }
 831 #endif
 832
 833 #ifdef CONFIG_GENERIC_BUG
 834 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
 835                          struct module *);
 836 void module_bug_cleanup(struct module *);
 837
 838 #else   /* !CONFIG_GENERIC_BUG */
 839
 840 static inline void module_bug_finalize(const Elf_Ehdr *hdr,
 841                                         const Elf_Shdr *sechdrs,
 842                                         struct module *mod)
 843 {
 844 }
 845 static inline void module_bug_cleanup(struct module *mod) {}
 846 #endif  /* CONFIG_GENERIC_BUG */
 847
 848 #ifdef CONFIG_RETPOLINE
 849 extern bool retpoline_module_ok(bool has_retpoline);
 850 #else
 851 static inline bool retpoline_module_ok(bool has_retpoline)
 852 {
 853         return true;
 854 }
 855 #endif
 856
 857 #ifdef CONFIG_MODULE_SIG
 858 static inline bool module_sig_ok(struct module *module)
 859 {
 860         return module->sig_ok;
 861 }
 862 #else   /* !CONFIG_MODULE_SIG */
 863 static inline bool module_sig_ok(struct module *module)
 864 {
 865         return true;
 866 }
 867 #endif  /* CONFIG_MODULE_SIG */
 868
 869 #endif /* _LINUX_MODULE_H */