include/linux/module.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Dynamic loading of modules into the kernel.
   4  *
   5  * Rewritten by Richard Henderson <rth@tamu.edu> Dec 1996
   6  * Rewritten again by Rusty Russell, 2002
   7  */
   8
   9 #ifndef _LINUX_MODULE_H
  10 #define _LINUX_MODULE_H
  11
  12 #include <linux/list.h>
  13 #include <linux/stat.h>
  14 #include <linux/compiler.h>
  15 #include <linux/cache.h>
  16 #include <linux/kmod.h>
  17 #include <linux/init.h>
  18 #include <linux/elf.h>
  19 #include <linux/stringify.h>
  20 #include <linux/kobject.h>
  21 #include <linux/moduleparam.h>
  22 #include <linux/jump_label.h>
  23 #include <linux/export.h>
  24 #include <linux/rbtree_latch.h>
  25 #include <linux/error-injection.h>
  26 #include <linux/tracepoint-defs.h>
  27 #include <linux/srcu.h>
  28
  29 #include <linux/percpu.h>
  30 #include <asm/module.h>
  31
  32 /* Not Yet Implemented */
  33 #define MODULE_SUPPORTED_DEVICE(name)
  34
  35 #define MODULE_NAME_LEN MAX_PARAM_PREFIX_LEN
  36
  37 struct modversion_info {
  38         unsigned long crc;
  39         char name[MODULE_NAME_LEN];
  40 };
  41
  42 struct module;
  43 struct exception_table_entry;
  44
  45 struct module_kobject {
  46         struct kobject kobj;
  47         struct module *mod;
  48         struct kobject *drivers_dir;
  49         struct module_param_attrs *mp;
  50         struct completion *kobj_completion;
  51 } __randomize_layout;
  52
  53 struct module_attribute {
  54         struct attribute attr;
  55         ssize_t (*show)(struct module_attribute *, struct module_kobject *,
  56                         char *);
  57         ssize_t (*store)(struct module_attribute *, struct module_kobject *,
  58                          const char *, size_t count);
  59         void (*setup)(struct module *, const char *);
  60         int (*test)(struct module *);
  61         void (*free)(struct module *);
  62 };
  63
  64 struct module_version_attribute {
  65         struct module_attribute mattr;
  66         const char *module_name;
  67         const char *version;
  68 } __attribute__ ((__aligned__(sizeof(void *))));
  69
  70 extern ssize_t __modver_version_show(struct module_attribute *,
  71                                      struct module_kobject *, char *);
  72
  73 extern struct module_attribute module_uevent;
  74
  75 /* These are either module local, or the kernel's dummy ones. */
  76 extern int init_module(void);
  77 extern void cleanup_module(void);
  78
  79 #ifndef MODULE
  80 /**
  81  * module_init() - driver initialization entry point
  82  * @x: function to be run at kernel boot time or module insertion
  83  *
  84  * module_init() will either be called during do_initcalls() (if
  85  * builtin) or at module insertion time (if a module).  There can only
  86  * be one per module.
  87  */
  88 #define module_init(x)  __initcall(x);
  89
  90 /**
  91  * module_exit() - driver exit entry point
  92  * @x: function to be run when driver is removed
  93  *
  94  * module_exit() will wrap the driver clean-up code
  95  * with cleanup_module() when used with rmmod when
  96  * the driver is a module.  If the driver is statically
  97  * compiled into the kernel, module_exit() has no effect.
  98  * There can only be one per module.
  99  */
 100 #define module_exit(x)  __exitcall(x);
 101
 102 #else /* MODULE */
 103
 104 /*
 105  * In most cases loadable modules do not need custom
 106  * initcall levels. There are still some valid cases where
 107  * a driver may be needed early if built in, and does not
 108  * matter when built as a loadable module. Like bus
 109  * snooping debug drivers.
 110  */
 111 #define early_initcall(fn)              module_init(fn)
 112 #define core_initcall(fn)               module_init(fn)
 113 #define core_initcall_sync(fn)          module_init(fn)
 114 #define postcore_initcall(fn)           module_init(fn)
 115 #define postcore_initcall_sync(fn)      module_init(fn)
 116 #define arch_initcall(fn)               module_init(fn)
 117 #define subsys_initcall(fn)             module_init(fn)
 118 #define subsys_initcall_sync(fn)        module_init(fn)
 119 #define fs_initcall(fn)                 module_init(fn)
 120 #define fs_initcall_sync(fn)            module_init(fn)
 121 #define rootfs_initcall(fn)             module_init(fn)
 122 #define device_initcall(fn)             module_init(fn)
 123 #define device_initcall_sync(fn)        module_init(fn)
 124 #define late_initcall(fn)               module_init(fn)
 125 #define late_initcall_sync(fn)          module_init(fn)
 126
 127 #define console_initcall(fn)            module_init(fn)
 128
 129 /* Each module must use one module_init(). */
 130 #define module_init(initfn)                                     \
 131         static inline initcall_t __maybe_unused __inittest(void)                \
 132         { return initfn; }                                      \
 133         int init_module(void) __copy(initfn) __attribute__((alias(#initfn)));
 134
 135 /* This is only required if you want to be unloadable. */
 136 #define module_exit(exitfn)                                     \
 137         static inline exitcall_t __maybe_unused __exittest(void)                \
 138         { return exitfn; }                                      \
 139         void cleanup_module(void) __copy(exitfn) __attribute__((alias(#exitfn)));
 140
 141 #endif
 142
 143 /* This means "can be init if no module support, otherwise module load
 144    may call it." */
 145 #ifdef CONFIG_MODULES
 146 #define __init_or_module
 147 #define __initdata_or_module
 148 #define __initconst_or_module
 149 #define __INIT_OR_MODULE        .text
 150 #define __INITDATA_OR_MODULE    .data
 151 #define __INITRODATA_OR_MODULE  .section ".rodata","a",%progbits
 152 #else
 153 #define __init_or_module __init
 154 #define __initdata_or_module __initdata
 155 #define __initconst_or_module __initconst
 156 #define __INIT_OR_MODULE __INIT
 157 #define __INITDATA_OR_MODULE __INITDATA
 158 #define __INITRODATA_OR_MODULE __INITRODATA
 159 #endif /*CONFIG_MODULES*/
 160
 161 /* Generic info of form tag = "info" */
 162 #define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
 163
 164 /* For userspace: you can also call me... */
 165 #define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
 166
 167 /* Soft module dependencies. See man modprobe.d for details.
 168  * Example: MODULE_SOFTDEP("pre: module-foo module-bar post: module-baz")
 169  */
 170 #define MODULE_SOFTDEP(_softdep) MODULE_INFO(softdep, _softdep)
 171
 172 /*
 173  * MODULE_FILE is used for generating modules.builtin
 174  * So, make it no-op when this is being built as a module
 175  */
 176 #ifdef MODULE
 177 #define MODULE_FILE
 178 #else
 179 #define MODULE_FILE     MODULE_INFO(file, KBUILD_MODFILE);
 180 #endif
 181
 182 /*
 183  * The following license idents are currently accepted as indicating free
 184  * software modules
 185  *
 186  *      "GPL"                           [GNU Public License v2]
 187  *      "GPL v2"                        [GNU Public License v2]
 188  *      "GPL and additional rights"     [GNU Public License v2 rights and more]
 189  *      "Dual BSD/GPL"                  [GNU Public License v2
 190  *                                       or BSD license choice]
 191  *      "Dual MIT/GPL"                  [GNU Public License v2
 192  *                                       or MIT license choice]
 193  *      "Dual MPL/GPL"                  [GNU Public License v2
 194  *                                       or Mozilla license choice]
 195  *
 196  * The following other idents are available
 197  *
 198  *      "Proprietary"                   [Non free products]
 199  *
 200  * Both "GPL v2" and "GPL" (the latter also in dual licensed strings) are
 201  * merely stating that the module is licensed under the GPL v2, but are not
 202  * telling whether "GPL v2 only" or "GPL v2 or later". The reason why there
 203  * are two variants is a historic and failed attempt to convey more
 204  * information in the MODULE_LICENSE string. For module loading the
 205  * "only/or later" distinction is completely irrelevant and does neither
 206  * replace the proper license identifiers in the corresponding source file
 207  * nor amends them in any way. The sole purpose is to make the
 208  * 'Proprietary' flagging work and to refuse to bind symbols which are
 209  * exported with EXPORT_SYMBOL_GPL when a non free module is loaded.
 210  *
 211  * In the same way "BSD" is not a clear license information. It merely
 212  * states, that the module is licensed under one of the compatible BSD
 213  * license variants. The detailed and correct license information is again
 214  * to be found in the corresponding source files.
 215  *
 216  * There are dual licensed components, but when running with Linux it is the
 217  * GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL
 218  * is a GPL combined work.
 219  *
 220  * This exists for several reasons
 221  * 1.   So modinfo can show license info for users wanting to vet their setup
 222  *      is free
 223  * 2.   So the community can ignore bug reports including proprietary modules
 224  * 3.   So vendors can do likewise based on their own policies
 225  */
 226 #define MODULE_LICENSE(_license) MODULE_FILE MODULE_INFO(license, _license)
 227
 228 /*
 229  * Author(s), use "Name <email>" or just "Name", for multiple
 230  * authors use multiple MODULE_AUTHOR() statements/lines.
 231  */
 232 #define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
 233
 234 /* What your module does. */
 235 #define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
 236
 237 #ifdef MODULE
 238 /* Creates an alias so file2alias.c can find device table. */
 239 #define MODULE_DEVICE_TABLE(type, name)                                 \
 240 extern typeof(name) __mod_##type##__##name##_device_table               \
 241   __attribute__ ((unused, alias(__stringify(name))))
 242 #else  /* !MODULE */
 243 #define MODULE_DEVICE_TABLE(type, name)
 244 #endif
 245
 246 /* Version of form [<epoch>:]<version>[-<extra-version>].
 247  * Or for CVS/RCS ID version, everything but the number is stripped.
 248  * <epoch>: A (small) unsigned integer which allows you to start versions
 249  * anew. If not mentioned, it's zero.  eg. "2:1.0" is after
 250  * "1:2.0".
 251
 252  * <version>: The <version> may contain only alphanumerics and the
 253  * character `.'.  Ordered by numeric sort for numeric parts,
 254  * ascii sort for ascii parts (as per RPM or DEB algorithm).
 255
 256  * <extraversion>: Like <version>, but inserted for local
 257  * customizations, eg "rh3" or "rusty1".
 258
 259  * Using this automatically adds a checksum of the .c files and the
 260  * local headers in "srcversion".
 261  */
 262
 263 #if defined(MODULE) || !defined(CONFIG_SYSFS)
 264 #define MODULE_VERSION(_version) MODULE_INFO(version, _version)
 265 #else
 266 #define MODULE_VERSION(_version)                                        \
 267         MODULE_INFO(version, _version);                                 \
 268         static struct module_version_attribute ___modver_attr = {       \
 269                 .mattr  = {                                             \
 270                         .attr   = {                                     \
 271                                 .name   = "version",                    \
 272                                 .mode   = S_IRUGO,                      \
 273                         },                                              \
 274                         .show   = __modver_version_show,                \
 275                 },                                                      \
 276                 .module_name    = KBUILD_MODNAME,                       \
 277                 .version        = _version,                             \
 278         };                                                              \
 279         static const struct module_version_attribute                    \
 280         __used __attribute__ ((__section__ ("__modver")))               \
 281         * __moduleparam_const __modver_attr = &___modver_attr
 282 #endif
 283
 284 /* Optional firmware file (or files) needed by the module
 285  * format is simply firmware file name.  Multiple firmware
 286  * files require multiple MODULE_FIRMWARE() specifiers */
 287 #define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
 288
 289 #define MODULE_IMPORT_NS(ns) MODULE_INFO(import_ns, #ns)
 290
 291 struct notifier_block;
 292
 293 #ifdef CONFIG_MODULES
 294
 295 extern int modules_disabled; /* for sysctl */
 296 /* Get/put a kernel symbol (calls must be symmetric) */
 297 void *__symbol_get(const char *symbol);
 298 void *__symbol_get_gpl(const char *symbol);
 299 #define symbol_get(x) ((typeof(&x))(__symbol_get(__stringify(x))))
 300
 301 /* modules using other modules: kdb wants to see this. */
 302 struct module_use {
 303         struct list_head source_list;
 304         struct list_head target_list;
 305         struct module *source, *target;
 306 };
 307
 308 enum module_state {
 309         MODULE_STATE_LIVE,      /* Normal state. */
 310         MODULE_STATE_COMING,    /* Full formed, running module_init. */
 311         MODULE_STATE_GOING,     /* Going away. */
 312         MODULE_STATE_UNFORMED,  /* Still setting it up. */
 313 };
 314
 315 struct mod_tree_node {
 316         struct module *mod;
 317         struct latch_tree_node node;
 318 };
 319
 320 struct module_layout {
 321         /* The actual code + data. */
 322         void *base;
 323         /* Total size. */
 324         unsigned int size;
 325         /* The size of the executable code.  */
 326         unsigned int text_size;
 327         /* Size of RO section of the module (text+rodata) */
 328         unsigned int ro_size;
 329         /* Size of RO after init section */
 330         unsigned int ro_after_init_size;
 331
 332 #ifdef CONFIG_MODULES_TREE_LOOKUP
 333         struct mod_tree_node mtn;
 334 #endif
 335 };
 336
 337 #ifdef CONFIG_MODULES_TREE_LOOKUP
 338 /* Only touch one cacheline for common rbtree-for-core-layout case. */
 339 #define __module_layout_align ____cacheline_aligned
 340 #else
 341 #define __module_layout_align
 342 #endif
 343
 344 struct mod_kallsyms {
 345         Elf_Sym *symtab;
 346         unsigned int num_symtab;
 347         char *strtab;
 348         char *typetab;
 349 };
 350
 351 #ifdef CONFIG_LIVEPATCH
 352 struct klp_modinfo {
 353         Elf_Ehdr hdr;
 354         Elf_Shdr *sechdrs;
 355         char *secstrings;
 356         unsigned int symndx;
 357 };
 358 #endif
 359
 360 struct module {
 361         enum module_state state;
 362
 363         /* Member of list of modules */
 364         struct list_head list;
 365
 366         /* Unique handle for this module */
 367         char name[MODULE_NAME_LEN];
 368
 369         /* Sysfs stuff. */
 370         struct module_kobject mkobj;
 371         struct module_attribute *modinfo_attrs;
 372         const char *version;
 373         const char *srcversion;
 374         struct kobject *holders_dir;
 375
 376         /* Exported symbols */
 377         const struct kernel_symbol *syms;
 378         const s32 *crcs;
 379         unsigned int num_syms;
 380
 381         /* Kernel parameters. */
 382 #ifdef CONFIG_SYSFS
 383         struct mutex param_lock;
 384 #endif
 385         struct kernel_param *kp;
 386         unsigned int num_kp;
 387
 388         /* GPL-only exported symbols. */
 389         unsigned int num_gpl_syms;
 390         const struct kernel_symbol *gpl_syms;
 391         const s32 *gpl_crcs;
 392
 393 #ifdef CONFIG_UNUSED_SYMBOLS
 394         /* unused exported symbols. */
 395         const struct kernel_symbol *unused_syms;
 396         const s32 *unused_crcs;
 397         unsigned int num_unused_syms;
 398
 399         /* GPL-only, unused exported symbols. */
 400         unsigned int num_unused_gpl_syms;
 401         const struct kernel_symbol *unused_gpl_syms;
 402         const s32 *unused_gpl_crcs;
 403 #endif
 404
 405 #ifdef CONFIG_MODULE_SIG
 406         /* Signature was verified. */
 407         bool sig_ok;
 408 #endif
 409
 410         bool async_probe_requested;
 411
 412         /* symbols that will be GPL-only in the near future. */
 413         const struct kernel_symbol *gpl_future_syms;
 414         const s32 *gpl_future_crcs;
 415         unsigned int num_gpl_future_syms;
 416
 417         /* Exception table */
 418         unsigned int num_exentries;
 419         struct exception_table_entry *extable;
 420
 421         /* Startup function. */
 422         int (*init)(void);
 423
 424         /* Core layout: rbtree is accessed frequently, so keep together. */
 425         struct module_layout core_layout __module_layout_align;
 426         struct module_layout init_layout;
 427
 428         /* Arch-specific module values */
 429         struct mod_arch_specific arch;
 430
 431         unsigned long taints;   /* same bits as kernel:taint_flags */
 432
 433 #ifdef CONFIG_GENERIC_BUG
 434         /* Support for BUG */
 435         unsigned num_bugs;
 436         struct list_head bug_list;
 437         struct bug_entry *bug_table;
 438 #endif
 439
 440 #ifdef CONFIG_KALLSYMS
 441         /* Protected by RCU and/or module_mutex: use rcu_dereference() */
 442         struct mod_kallsyms __rcu *kallsyms;
 443         struct mod_kallsyms core_kallsyms;
 444
 445         /* Section attributes */
 446         struct module_sect_attrs *sect_attrs;
 447
 448         /* Notes attributes */
 449         struct module_notes_attrs *notes_attrs;
 450 #endif
 451
 452         /* The command line arguments (may be mangled).  People like
 453            keeping pointers to this stuff */
 454         char *args;
 455
 456 #ifdef CONFIG_SMP
 457         /* Per-cpu data. */
 458         void __percpu *percpu;
 459         unsigned int percpu_size;
 460 #endif
 461
 462 #ifdef CONFIG_TRACEPOINTS
 463         unsigned int num_tracepoints;
 464         tracepoint_ptr_t *tracepoints_ptrs;
 465 #endif
 466 #ifdef CONFIG_TREE_SRCU
 467         unsigned int num_srcu_structs;
 468         struct srcu_struct **srcu_struct_ptrs;
 469 #endif
 470 #ifdef CONFIG_BPF_EVENTS
 471         unsigned int num_bpf_raw_events;
 472         struct bpf_raw_event_map *bpf_raw_events;
 473 #endif
 474 #ifdef CONFIG_JUMP_LABEL
 475         struct jump_entry *jump_entries;
 476         unsigned int num_jump_entries;
 477 #endif
 478 #ifdef CONFIG_TRACING
 479         unsigned int num_trace_bprintk_fmt;
 480         const char **trace_bprintk_fmt_start;
 481 #endif
 482 #ifdef CONFIG_EVENT_TRACING
 483         struct trace_event_call **trace_events;
 484         unsigned int num_trace_events;
 485         struct trace_eval_map **trace_evals;
 486         unsigned int num_trace_evals;
 487 #endif
 488 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 489         unsigned int num_ftrace_callsites;
 490         unsigned long *ftrace_callsites;
 491 #endif
 492
 493 #ifdef CONFIG_LIVEPATCH
 494         bool klp; /* Is this a livepatch module? */
 495         bool klp_alive;
 496
 497         /* Elf information */
 498         struct klp_modinfo *klp_info;
 499 #endif
 500
 501 #ifdef CONFIG_MODULE_UNLOAD
 502         /* What modules depend on me? */
 503         struct list_head source_list;
 504         /* What modules do I depend on? */
 505         struct list_head target_list;
 506
 507         /* Destruction function. */
 508         void (*exit)(void);
 509
 510         atomic_t refcnt;
 511 #endif
 512
 513 #ifdef CONFIG_CONSTRUCTORS
 514         /* Constructor functions. */
 515         ctor_fn_t *ctors;
 516         unsigned int num_ctors;
 517 #endif
 518
 519 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
 520         struct error_injection_entry *ei_funcs;
 521         unsigned int num_ei_funcs;
 522 #endif
 523 } ____cacheline_aligned __randomize_layout;
 524 #ifndef MODULE_ARCH_INIT
 525 #define MODULE_ARCH_INIT {}
 526 #endif
 527
 528 #ifndef HAVE_ARCH_KALLSYMS_SYMBOL_VALUE
 529 static inline unsigned long kallsyms_symbol_value(const Elf_Sym *sym)
 530 {
 531         return sym->st_value;
 532 }
 533 #endif
 534
 535 extern struct mutex module_mutex;
 536
 537 /* FIXME: It'd be nice to isolate modules during init, too, so they
 538    aren't used before they (may) fail.  But presently too much code
 539    (IDE & SCSI) require entry into the module during init.*/
 540 static inline bool module_is_live(struct module *mod)
 541 {
 542         return mod->state != MODULE_STATE_GOING;
 543 }
 544
 545 struct module *__module_text_address(unsigned long addr);
 546 struct module *__module_address(unsigned long addr);
 547 bool is_module_address(unsigned long addr);
 548 bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr);
 549 bool is_module_percpu_address(unsigned long addr);
 550 bool is_module_text_address(unsigned long addr);
 551
 552 static inline bool within_module_core(unsigned long addr,
 553                                       const struct module *mod)
 554 {
 555         return (unsigned long)mod->core_layout.base <= addr &&
 556                addr < (unsigned long)mod->core_layout.base + mod->core_layout.size;
 557 }
 558
 559 static inline bool within_module_init(unsigned long addr,
 560                                       const struct module *mod)
 561 {
 562         return (unsigned long)mod->init_layout.base <= addr &&
 563                addr < (unsigned long)mod->init_layout.base + mod->init_layout.size;
 564 }
 565
 566 static inline bool within_module(unsigned long addr, const struct module *mod)
 567 {
 568         return within_module_init(addr, mod) || within_module_core(addr, mod);
 569 }
 570
 571 /* Search for module by name: must hold module_mutex. */
 572 struct module *find_module(const char *name);
 573
 574 struct symsearch {
 575         const struct kernel_symbol *start, *stop;
 576         const s32 *crcs;
 577         enum {
 578                 NOT_GPL_ONLY,
 579                 GPL_ONLY,
 580                 WILL_BE_GPL_ONLY,
 581         } licence;
 582         bool unused;
 583 };
 584
 585 /*
 586  * Search for an exported symbol by name.
 587  *
 588  * Must be called with module_mutex held or preemption disabled.
 589  */
 590 const struct kernel_symbol *find_symbol(const char *name,
 591                                         struct module **owner,
 592                                         const s32 **crc,
 593                                         bool gplok,
 594                                         bool warn);
 595
 596 /*
 597  * Walk the exported symbol table
 598  *
 599  * Must be called with module_mutex held or preemption disabled.
 600  */
 601 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
 602                                     struct module *owner,
 603                                     void *data), void *data);
 604
 605 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
 606    symnum out of range. */
 607 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
 608                         char *name, char *module_name, int *exported);
 609
 610 /* Look for this name: can be of form module:name. */
 611 unsigned long module_kallsyms_lookup_name(const char *name);
 612
 613 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 614                                              struct module *, unsigned long),
 615                                    void *data);
 616
 617 extern void __noreturn __module_put_and_exit(struct module *mod,
 618                         long code);
 619 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code)
 620
 621 #ifdef CONFIG_MODULE_UNLOAD
 622 int module_refcount(struct module *mod);
 623 void __symbol_put(const char *symbol);
 624 #define symbol_put(x) __symbol_put(__stringify(x))
 625 void symbol_put_addr(void *addr);
 626
 627 /* Sometimes we know we already have a refcount, and it's easier not
 628    to handle the error case (which only happens with rmmod --wait). */
 629 extern void __module_get(struct module *module);
 630
 631 /* This is the Right Way to get a module: if it fails, it's being removed,
 632  * so pretend it's not there. */
 633 extern bool try_module_get(struct module *module);
 634
 635 extern void module_put(struct module *module);
 636
 637 #else /*!CONFIG_MODULE_UNLOAD*/
 638 static inline bool try_module_get(struct module *module)
 639 {
 640         return !module || module_is_live(module);
 641 }
 642 static inline void module_put(struct module *module)
 643 {
 644 }
 645 static inline void __module_get(struct module *module)
 646 {
 647 }
 648 #define symbol_put(x) do { } while (0)
 649 #define symbol_put_addr(p) do { } while (0)
 650
 651 #endif /* CONFIG_MODULE_UNLOAD */
 652 int ref_module(struct module *a, struct module *b);
 653
 654 /* This is a #define so the string doesn't get put in every .o file */
 655 #define module_name(mod)                        \
 656 ({                                              \
 657         struct module *__mod = (mod);           \
 658         __mod ? __mod->name : "kernel";         \
 659 })
 660
 661 /* Dereference module function descriptor */
 662 void *dereference_module_function_descriptor(struct module *mod, void *ptr);
 663
 664 /* For kallsyms to ask for address resolution.  namebuf should be at
 665  * least KSYM_NAME_LEN long: a pointer to namebuf is returned if
 666  * found, otherwise NULL. */
 667 const char *module_address_lookup(unsigned long addr,
 668                             unsigned long *symbolsize,
 669                             unsigned long *offset,
 670                             char **modname,
 671                             char *namebuf);
 672 int lookup_module_symbol_name(unsigned long addr, char *symname);
 673 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
 674
 675 int register_module_notifier(struct notifier_block *nb);
 676 int unregister_module_notifier(struct notifier_block *nb);
 677
 678 extern void print_modules(void);
 679
 680 static inline bool module_requested_async_probing(struct module *module)
 681 {
 682         return module && module->async_probe_requested;
 683 }
 684
 685 #ifdef CONFIG_LIVEPATCH
 686 static inline bool is_livepatch_module(struct module *mod)
 687 {
 688         return mod->klp;
 689 }
 690 #else /* !CONFIG_LIVEPATCH */
 691 static inline bool is_livepatch_module(struct module *mod)
 692 {
 693         return false;
 694 }
 695 #endif /* CONFIG_LIVEPATCH */
 696
 697 bool is_module_sig_enforced(void);
 698 void set_module_sig_enforced(void);
 699
 700 #else /* !CONFIG_MODULES... */
 701
 702 static inline struct module *__module_address(unsigned long addr)
 703 {
 704         return NULL;
 705 }
 706
 707 static inline struct module *__module_text_address(unsigned long addr)
 708 {
 709         return NULL;
 710 }
 711
 712 static inline bool is_module_address(unsigned long addr)
 713 {
 714         return false;
 715 }
 716
 717 static inline bool is_module_percpu_address(unsigned long addr)
 718 {
 719         return false;
 720 }
 721
 722 static inline bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
 723 {
 724         return false;
 725 }
 726
 727 static inline bool is_module_text_address(unsigned long addr)
 728 {
 729         return false;
 730 }
 731
 732 static inline bool within_module_core(unsigned long addr,
 733                                       const struct module *mod)
 734 {
 735         return false;
 736 }
 737
 738 static inline bool within_module_init(unsigned long addr,
 739                                       const struct module *mod)
 740 {
 741         return false;
 742 }
 743
 744 static inline bool within_module(unsigned long addr, const struct module *mod)
 745 {
 746         return false;
 747 }
 748
 749 /* Get/put a kernel symbol (calls should be symmetric) */
 750 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
 751 #define symbol_put(x) do { } while (0)
 752 #define symbol_put_addr(x) do { } while (0)
 753
 754 static inline void __module_get(struct module *module)
 755 {
 756 }
 757
 758 static inline bool try_module_get(struct module *module)
 759 {
 760         return true;
 761 }
 762
 763 static inline void module_put(struct module *module)
 764 {
 765 }
 766
 767 #define module_name(mod) "kernel"
 768
 769 /* For kallsyms to ask for address resolution.  NULL means not found. */
 770 static inline const char *module_address_lookup(unsigned long addr,
 771                                           unsigned long *symbolsize,
 772                                           unsigned long *offset,
 773                                           char **modname,
 774                                           char *namebuf)
 775 {
 776         return NULL;
 777 }
 778
 779 static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
 780 {
 781         return -ERANGE;
 782 }
 783
 784 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
 785 {
 786         return -ERANGE;
 787 }
 788
 789 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
 790                                         char *type, char *name,
 791                                         char *module_name, int *exported)
 792 {
 793         return -ERANGE;
 794 }
 795
 796 static inline unsigned long module_kallsyms_lookup_name(const char *name)
 797 {
 798         return 0;
 799 }
 800
 801 static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 802                                                            struct module *,
 803                                                            unsigned long),
 804                                                  void *data)
 805 {
 806         return 0;
 807 }
 808
 809 static inline int register_module_notifier(struct notifier_block *nb)
 810 {
 811         /* no events will happen anyway, so this can always succeed */
 812         return 0;
 813 }
 814
 815 static inline int unregister_module_notifier(struct notifier_block *nb)
 816 {
 817         return 0;
 818 }
 819
 820 #define module_put_and_exit(code) do_exit(code)
 821
 822 static inline void print_modules(void)
 823 {
 824 }
 825
 826 static inline bool module_requested_async_probing(struct module *module)
 827 {
 828         return false;
 829 }
 830
 831 static inline bool is_module_sig_enforced(void)
 832 {
 833         return false;
 834 }
 835
 836 static inline void set_module_sig_enforced(void)
 837 {
 838 }
 839
 840 /* Dereference module function descriptor */
 841 static inline
 842 void *dereference_module_function_descriptor(struct module *mod, void *ptr)
 843 {
 844         return ptr;
 845 }
 846
 847 #endif /* CONFIG_MODULES */
 848
 849 #ifdef CONFIG_SYSFS
 850 extern struct kset *module_kset;
 851 extern struct kobj_type module_ktype;
 852 extern int module_sysfs_initialized;
 853 #endif /* CONFIG_SYSFS */
 854
 855 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
 856
 857 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
 858
 859 #define __MODULE_STRING(x) __stringify(x)
 860
 861 #ifdef CONFIG_STRICT_MODULE_RWX
 862 extern void module_enable_ro(const struct module *mod, bool after_init);
 863 extern void module_disable_ro(const struct module *mod);
 864 #else
 865 static inline void module_enable_ro(const struct module *mod, bool after_init) { }
 866 static inline void module_disable_ro(const struct module *mod) { }
 867 #endif
 868
 869 #ifdef CONFIG_GENERIC_BUG
 870 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
 871                          struct module *);
 872 void module_bug_cleanup(struct module *);
 873
 874 #else   /* !CONFIG_GENERIC_BUG */
 875
 876 static inline void module_bug_finalize(const Elf_Ehdr *hdr,
 877                                         const Elf_Shdr *sechdrs,
 878                                         struct module *mod)
 879 {
 880 }
 881 static inline void module_bug_cleanup(struct module *mod) {}
 882 #endif  /* CONFIG_GENERIC_BUG */
 883
 884 #ifdef CONFIG_RETPOLINE
 885 extern bool retpoline_module_ok(bool has_retpoline);
 886 #else
 887 static inline bool retpoline_module_ok(bool has_retpoline)
 888 {
 889         return true;
 890 }
 891 #endif
 892
 893 #ifdef CONFIG_MODULE_SIG
 894 static inline bool module_sig_ok(struct module *module)
 895 {
 896         return module->sig_ok;
 897 }
 898 #else   /* !CONFIG_MODULE_SIG */
 899 static inline bool module_sig_ok(struct module *module)
 900 {
 901         return true;
 902 }
 903 #endif  /* CONFIG_MODULE_SIG */
 904
 905 #endif /* _LINUX_MODULE_H */