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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 | #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/config.h> #include <linux/sched.h> #include <linux/spinlock.h> #include <linux/list.h> #include <linux/stat.h> #include <linux/compiler.h> #include <linux/cache.h> #include <linux/kmod.h> #include <linux/elf.h> #include <linux/stringify.h> #include <asm/module.h> #include <asm/uaccess.h> /* For struct exception_table_entry */ /* Not Yet Implemented */ #define MODULE_LICENSE(name) #define MODULE_AUTHOR(name) #define MODULE_DESCRIPTION(desc) #define MODULE_SUPPORTED_DEVICE(name) #define MODULE_PARM_DESC(var,desc) #define print_modules() /* v850 toolchain uses a `_' prefix for all user symbols */ #ifndef MODULE_SYMBOL_PREFIX #define MODULE_SYMBOL_PREFIX "" #endif #define MODULE_NAME_LEN (64 - sizeof(unsigned long)) struct kernel_symbol { unsigned long value; char name[MODULE_NAME_LEN]; }; #ifdef MODULE #ifdef KBUILD_MODNAME static const char __module_name[MODULE_NAME_LEN] __attribute__((section(".gnu.linkonce.modname"))) = \ __stringify(KBUILD_MODNAME); #endif /* For replacement modutils, use an alias not a pointer. */ #define MODULE_GENERIC_TABLE(gtype,name) \ static const unsigned long __module_##gtype##_size \ __attribute__ ((unused)) = sizeof(struct gtype##_id); \ static const struct gtype##_id * __module_##gtype##_table \ __attribute__ ((unused)) = name; \ extern const struct gtype##_id __mod_##gtype##_table \ __attribute__ ((unused, alias(__stringify(name)))) /* This is magically filled in by the linker, but THIS_MODULE must be a constant so it works in initializers. */ 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 #define MODULE_DEVICE_TABLE(type,name) \ MODULE_GENERIC_TABLE(type##_device,name) struct kernel_symbol_group { /* Links us into the global symbol list */ struct list_head list; /* Module which owns it (if any) */ struct module *owner; unsigned int num_syms; const struct kernel_symbol *syms; }; struct exception_table { struct list_head list; unsigned int num_entries; const struct exception_table_entry *entry; }; #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))) /* For every exported symbol, place a struct in the __ksymtab section */ #define EXPORT_SYMBOL(sym) \ const struct kernel_symbol __ksymtab_##sym \ __attribute__((section("__ksymtab"))) \ = { (unsigned long)&sym, MODULE_SYMBOL_PREFIX #sym } #define EXPORT_SYMBOL_NOVERS(sym) EXPORT_SYMBOL(sym) #define EXPORT_SYMBOL_GPL(sym) EXPORT_SYMBOL(sym) struct module_ref { atomic_t count; } ____cacheline_aligned; 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]; /* Exported symbols */ struct kernel_symbol_group symbols; /* Exception tables */ struct exception_table extable; /* Startup function. */ int (*init)(void); /* If this is non-NULL, vfree after init() returns */ void *module_init; /* Here is the actual code + data, vfree'd on unload. */ void *module_core; /* Here are the sizes of the init and core sections */ unsigned long init_size, core_size; /* Arch-specific module values */ struct mod_arch_specific arch; /* Am I unsafe to unload? */ int unsafe; #ifdef CONFIG_MODULE_UNLOAD /* Reference counts */ struct module_ref ref[NR_CPUS]; /* What modules depend on me? */ struct list_head modules_which_use_me; /* Who is waiting for us to be unloaded */ struct task_struct *waiter; /* Destruction function. */ void (*exit)(void); #endif #ifdef CONFIG_KALLSYMS /* We keep the symbol and string tables for kallsyms. */ Elf_Sym *symtab; unsigned long num_syms; char *strtab; #endif /* The command line arguments (may be mangled). People like keeping pointers to this stuff */ char args[0]; }; /* 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; } #ifdef CONFIG_MODULE_UNLOAD void __symbol_put(const char *symbol); #define symbol_put(x) __symbol_put(MODULE_SYMBOL_PREFIX #x) void symbol_put_addr(void *addr); /* We only need protection against local interrupts. */ #ifndef __HAVE_ARCH_LOCAL_INC #define local_inc(x) atomic_inc(x) #define local_dec(x) atomic_dec(x) #endif static inline int try_module_get(struct module *module) { int ret = 1; if (module) { unsigned int cpu = get_cpu(); if (likely(module_is_live(module))) local_inc(&module->ref[cpu].count); else ret = 0; put_cpu(); } return ret; } static inline void module_put(struct module *module) { if (module) { unsigned int cpu = get_cpu(); local_dec(&module->ref[cpu].count); /* Maybe they're waiting for us to drop reference? */ if (unlikely(!module_is_live(module))) wake_up_process(module->waiter); put_cpu(); } } #else /*!CONFIG_MODULE_UNLOAD*/ static inline int try_module_get(struct module *module) { return !module || module_is_live(module); } static inline void module_put(struct module *module) { } #define symbol_put(x) do { } while(0) #define symbol_put_addr(p) do { } while(0) #endif /* CONFIG_MODULE_UNLOAD */ /* This is a #define so the string doesn't get put in every .o file */ #define module_name(mod) \ ({ \ struct module *__mod = (mod); \ __mod ? __mod->name : "kernel"; \ }) #define __unsafe(mod) \ do { \ if (mod && !(mod)->unsafe) { \ printk(KERN_WARNING \ "Module %s cannot be unloaded due to unsafe usage in" \ " %s:%u\n", (mod)->name, __FILE__, __LINE__); \ (mod)->unsafe = 1; \ } \ } while(0) /* For kallsyms to ask for address resolution. NULL means not found. */ const char *module_address_lookup(unsigned long addr, unsigned long *symbolsize, unsigned long *offset, char **modname); #else /* !CONFIG_MODULES... */ #define EXPORT_SYMBOL(sym) #define EXPORT_SYMBOL_GPL(sym) #define EXPORT_SYMBOL_NOVERS(sym) /* Get/put a kernel symbol (calls should be symmetric) */ #define symbol_get(x) (&(x)) #define symbol_put(x) do { } while(0) #define symbol_put_addr(x) do { } while(0) #define try_module_get(module) 1 #define module_put(module) do { } while(0) #define module_name(mod) "kernel" #define __unsafe(mod) /* For kallsyms to ask for address resolution. NULL means not found. */ static inline const char *module_address_lookup(unsigned long addr, unsigned long *symbolsize, unsigned long *offset, char **modname) { return NULL; } #endif /* CONFIG_MODULES */ /* For archs to search exception tables */ extern struct list_head extables; extern spinlock_t modlist_lock; #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x) /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */ #define __MOD_INC_USE_COUNT(mod) \ do { __unsafe(mod); (void)try_module_get(mod); } while(0) #define __MOD_DEC_USE_COUNT(mod) module_put(mod) #define SET_MODULE_OWNER(dev) ((dev)->owner = THIS_MODULE) struct obsolete_modparm { char name[64]; char type[64-sizeof(void *)]; void *addr; }; #ifdef MODULE /* DEPRECATED: Do not use. */ #define MODULE_PARM(var,type) \ struct obsolete_modparm __parm_##var __attribute__((section("__obsparm"))) = \ { __stringify(var), type }; #else #define MODULE_PARM(var,type) #endif /* People do this inside their init routines, when the module isn't "live" yet. They should no longer be doing that, but meanwhile... */ #if defined(CONFIG_MODULE_UNLOAD) && defined(MODULE) #define MOD_INC_USE_COUNT \ do { __unsafe(THIS_MODULE); local_inc(&THIS_MODULE->ref[get_cpu()].count); put_cpu(); } while (0) #else #define MOD_INC_USE_COUNT \ do { __unsafe(THIS_MODULE); (void)try_module_get(THIS_MODULE); } while (0) #endif #define MOD_DEC_USE_COUNT module_put(THIS_MODULE) #define try_inc_mod_count(mod) try_module_get(mod) #define EXPORT_NO_SYMBOLS extern int module_dummy_usage; #define GET_USE_COUNT(module) (module_dummy_usage) #define MOD_IN_USE 0 #define __MODULE_STRING(x) __stringify(x) #define __mod_between(a_start, a_len, b_start, b_len) \ (((a_start) >= (b_start) && (a_start) <= (b_start)+(b_len)) \ || ((a_start)+(a_len) >= (b_start) \ && (a_start)+(a_len) <= (b_start)+(b_len))) #define mod_bound(p, n, m) \ (((m)->module_init \ && __mod_between((p),(n),(m)->module_init,(m)->init_size)) \ || __mod_between((p),(n),(m)->module_core,(m)->core_size)) /* Old-style "I'll just call it init_module and it'll be run at insert". Use module_init(myroutine) instead. */ #ifdef MODULE #define init_module(voidarg) __initfn(void) #define cleanup_module(voidarg) __exitfn(void) #endif /* * The exception and symbol tables, and the lock * to protect them. */ extern spinlock_t modlist_lock; extern struct list_head extables; extern struct list_head symbols; /* Use symbol_get and symbol_put instead. You'll thank me. */ #define HAVE_INTER_MODULE extern void inter_module_register(const char *, struct module *, const void *); extern void inter_module_unregister(const char *); extern const void *inter_module_get(const char *); extern const void *inter_module_get_request(const char *, const char *); extern void inter_module_put(const char *); #endif /* _LINUX_MODULE_H */ |