1 /*- 2 * Copyright (c) 1997 Doug Rabson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/sys/kern/kern_linker.c,v 1.41.2.3 2001/11/21 17:50:35 luigi Exp $ 27 * $DragonFly: src/sys/kern/kern_linker.c,v 1.44 2008/09/01 19:39:44 dillon Exp $ 28 */ 29 30 #include "opt_ddb.h" 31 32 #include <sys/param.h> 33 #include <sys/kernel.h> 34 #include <sys/systm.h> 35 #include <sys/malloc.h> 36 #include <sys/sysproto.h> 37 #include <sys/sysent.h> 38 #include <sys/proc.h> 39 #include <sys/priv.h> 40 #include <sys/lock.h> 41 #include <sys/module.h> 42 #include <sys/queue.h> 43 #include <sys/linker.h> 44 #include <sys/fcntl.h> 45 #include <sys/libkern.h> 46 #include <sys/nlookup.h> 47 #include <sys/vnode.h> 48 #include <sys/sysctl.h> 49 50 #include <vm/vm_zone.h> 51 52 #include <sys/mplock2.h> 53 54 #ifdef _KERNEL_VIRTUAL 55 #include <dlfcn.h> 56 #endif 57 58 #ifdef KLD_DEBUG 59 int kld_debug = 1; 60 #endif 61 62 /* Metadata from the static kernel */ 63 SET_DECLARE(modmetadata_set, struct mod_metadata); 64 MALLOC_DEFINE(M_LINKER, "kld", "kernel linker"); 65 66 linker_file_t linker_current_file; 67 linker_file_t linker_kernel_file; 68 69 static struct lock lock; /* lock for the file list */ 70 static linker_class_list_t classes; 71 static linker_file_list_t linker_files; 72 static int next_file_id = 1; 73 74 /* XXX wrong name; we're looking at version provision tags here, not modules */ 75 typedef TAILQ_HEAD(, modlist) modlisthead_t; 76 struct modlist { 77 TAILQ_ENTRY(modlist) link; /* chain together all modules */ 78 linker_file_t container; 79 const char *name; 80 int version; 81 }; 82 typedef struct modlist *modlist_t; 83 static modlisthead_t found_modules; 84 85 86 static int linker_load_module(const char *kldname, const char *modname, 87 struct linker_file *parent, struct mod_depend *verinfo, 88 struct linker_file **lfpp); 89 90 static char * 91 linker_strdup(const char *str) 92 { 93 char *result; 94 95 result = kmalloc(strlen(str) + 1, M_LINKER, M_WAITOK); 96 strcpy(result, str); 97 return(result); 98 } 99 100 static void 101 linker_init(void* arg) 102 { 103 lockinit(&lock, "klink", 0, 0); 104 TAILQ_INIT(&classes); 105 TAILQ_INIT(&linker_files); 106 } 107 108 SYSINIT(linker, SI_BOOT2_KLD, SI_ORDER_FIRST, linker_init, 0); 109 110 int 111 linker_add_class(const char* desc, void* priv, 112 struct linker_class_ops* ops) 113 { 114 linker_class_t lc; 115 116 lc = kmalloc(sizeof(struct linker_class), M_LINKER, M_NOWAIT | M_ZERO); 117 if (!lc) 118 return ENOMEM; 119 120 lc->desc = desc; 121 lc->priv = priv; 122 lc->ops = ops; 123 TAILQ_INSERT_HEAD(&classes, lc, link); 124 125 return 0; 126 } 127 128 static void 129 linker_file_sysinit(linker_file_t lf) 130 { 131 struct sysinit** start, ** stop; 132 struct sysinit** sipp; 133 struct sysinit** xipp; 134 struct sysinit* save; 135 136 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", 137 lf->filename)); 138 139 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0) 140 return; 141 142 /* 143 * Perform a bubble sort of the system initialization objects by 144 * their subsystem (primary key) and order (secondary key). 145 * 146 * Since some things care about execution order, this is the 147 * operation which ensures continued function. 148 */ 149 for (sipp = start; sipp < stop; sipp++) { 150 for (xipp = sipp + 1; xipp < stop; xipp++) { 151 if ((*sipp)->subsystem < (*xipp)->subsystem || 152 ((*sipp)->subsystem == (*xipp)->subsystem && 153 (*sipp)->order <= (*xipp)->order)) 154 continue; /* skip*/ 155 save = *sipp; 156 *sipp = *xipp; 157 *xipp = save; 158 } 159 } 160 161 162 /* 163 * Traverse the (now) ordered list of system initialization tasks. 164 * Perform each task, and continue on to the next task. 165 */ 166 for (sipp = start; sipp < stop; sipp++) { 167 if ((*sipp)->subsystem == SI_SPECIAL_DUMMY) 168 continue; /* skip dummy task(s)*/ 169 170 /* Call function */ 171 (*((*sipp)->func))((*sipp)->udata); 172 } 173 } 174 175 static void 176 linker_file_sysuninit(linker_file_t lf) 177 { 178 struct sysinit** start, ** stop; 179 struct sysinit** sipp; 180 struct sysinit** xipp; 181 struct sysinit* save; 182 183 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 184 lf->filename)); 185 186 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, NULL) != 0) 187 return; 188 189 /* 190 * Perform a reverse bubble sort of the system initialization objects 191 * by their subsystem (primary key) and order (secondary key). 192 * 193 * Since some things care about execution order, this is the 194 * operation which ensures continued function. 195 */ 196 for (sipp = start; sipp < stop; sipp++) { 197 for (xipp = sipp + 1; xipp < stop; xipp++) { 198 if ((*sipp)->subsystem > (*xipp)->subsystem || 199 ((*sipp)->subsystem == (*xipp)->subsystem && 200 (*sipp)->order >= (*xipp)->order)) 201 continue; /* skip*/ 202 save = *sipp; 203 *sipp = *xipp; 204 *xipp = save; 205 } 206 } 207 208 209 /* 210 * Traverse the (now) ordered list of system initialization tasks. 211 * Perform each task, and continue on to the next task. 212 */ 213 for (sipp = start; sipp < stop; sipp++) { 214 if ((*sipp)->subsystem == SI_SPECIAL_DUMMY) 215 continue; /* skip dummy task(s)*/ 216 217 /* Call function */ 218 (*((*sipp)->func))((*sipp)->udata); 219 } 220 } 221 222 static void 223 linker_file_register_sysctls(linker_file_t lf) 224 { 225 struct sysctl_oid **start, **stop, **oidp; 226 227 KLD_DPF(FILE, ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 228 lf->filename)); 229 230 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 231 return; 232 for (oidp = start; oidp < stop; oidp++) 233 sysctl_register_oid(*oidp); 234 } 235 236 static void 237 linker_file_unregister_sysctls(linker_file_t lf) 238 { 239 struct sysctl_oid **start, **stop, **oidp; 240 241 KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs for %s\n", 242 lf->filename)); 243 244 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 245 return; 246 for (oidp = start; oidp < stop; oidp++) 247 sysctl_unregister_oid(*oidp); 248 } 249 250 static int 251 linker_file_register_modules(linker_file_t lf) 252 { 253 struct mod_metadata **start, **stop, **mdp; 254 const moduledata_t *moddata; 255 int first_error, error; 256 257 KLD_DPF(FILE, ("linker_file_register_modules: registering modules in %s\n", 258 lf->filename)); 259 260 if (linker_file_lookup_set(lf, "modmetadata_set", &start, &stop, NULL) != 0) { 261 /* 262 * This fallback should be unnecessary, but if we get booted 263 * from boot2 instead of loader and we are missing our 264 * metadata then we have to try the best we can. 265 */ 266 if (lf == linker_kernel_file) { 267 start = SET_BEGIN(modmetadata_set); 268 stop = SET_LIMIT(modmetadata_set); 269 } else 270 return (0); 271 } 272 first_error = 0; 273 for (mdp = start; mdp < stop; mdp++) { 274 if ((*mdp)->md_type != MDT_MODULE) 275 continue; 276 moddata = (*mdp)->md_data; 277 KLD_DPF(FILE, ("Registering module %s in %s\n", moddata->name, lf->filename)); 278 error = module_register(moddata, lf); 279 if (error) { 280 kprintf("Module %s failed to register: %d\n", moddata->name, error); 281 if (first_error == 0) 282 first_error = error; 283 } 284 } 285 return (first_error); 286 } 287 288 static void 289 linker_init_kernel_modules(void) 290 { 291 292 linker_file_register_modules(linker_kernel_file); 293 } 294 295 SYSINIT(linker_kernel, SI_BOOT2_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 0); 296 297 int 298 linker_load_file(const char *filename, linker_file_t *result) 299 { 300 linker_class_t lc; 301 linker_file_t lf; 302 int foundfile, error = 0; 303 304 /* Refuse to load modules if securelevel raised */ 305 if (securelevel > 0 || kernel_mem_readonly) 306 return EPERM; 307 308 lf = linker_find_file_by_name(filename); 309 if (lf) { 310 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded, incrementing refs\n", filename)); 311 *result = lf; 312 lf->refs++; 313 goto out; 314 } 315 316 lf = NULL; 317 foundfile = 0; 318 TAILQ_FOREACH(lc, &classes, link) { 319 KLD_DPF(FILE, ("linker_load_file: trying to load %s as %s\n", 320 filename, lc->desc)); 321 322 error = lc->ops->load_file(filename, &lf); 323 /* 324 * If we got something other than ENOENT, then it exists but we cannot 325 * load it for some other reason. 326 */ 327 if (error != ENOENT) 328 foundfile = 1; 329 if (lf) { 330 error = linker_file_register_modules(lf); 331 if (error == EEXIST) { 332 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */); 333 return (error); 334 } 335 linker_file_register_sysctls(lf); 336 linker_file_sysinit(lf); 337 lf->flags |= LINKER_FILE_LINKED; 338 *result = lf; 339 return (0); 340 } 341 } 342 /* 343 * Less than ideal, but tells the user whether it failed to load or 344 * the module was not found. 345 */ 346 if (foundfile) { 347 /* 348 * If the file type has not been recognized by the last try 349 * printout a message before to fail. 350 */ 351 if (error == ENOSYS) 352 kprintf("linker_load_file: Unsupported file type\n"); 353 354 /* 355 * Format not recognized or otherwise unloadable. 356 * When loading a module that is statically built into 357 * the kernel EEXIST percolates back up as the return 358 * value. Preserve this so that apps can recognize this 359 * special case. 360 */ 361 if (error != EEXIST) 362 error = ENOEXEC; 363 } else { 364 error = ENOENT; /* Nothing found */ 365 } 366 367 out: 368 return error; 369 } 370 371 372 linker_file_t 373 linker_find_file_by_name(const char* filename) 374 { 375 linker_file_t lf = 0; 376 char *koname; 377 int i; 378 379 for (i = strlen(filename); i > 0 && filename[i-1] != '/'; --i) 380 ; 381 filename += i; 382 383 koname = kmalloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 384 ksprintf(koname, "%s.ko", filename); 385 386 lockmgr(&lock, LK_SHARED); 387 TAILQ_FOREACH(lf, &linker_files, link) { 388 if (!strcmp(lf->filename, koname)) 389 break; 390 if (!strcmp(lf->filename, filename)) 391 break; 392 } 393 lockmgr(&lock, LK_RELEASE); 394 395 if (koname) 396 kfree(koname, M_LINKER); 397 return lf; 398 } 399 400 linker_file_t 401 linker_find_file_by_id(int fileid) 402 { 403 linker_file_t lf = 0; 404 405 lockmgr(&lock, LK_SHARED); 406 TAILQ_FOREACH(lf, &linker_files, link) 407 if (lf->id == fileid) 408 break; 409 lockmgr(&lock, LK_RELEASE); 410 411 return lf; 412 } 413 414 int 415 linker_file_foreach(linker_predicate_t *predicate, void *context) 416 { 417 linker_file_t lf; 418 int retval = 0; 419 420 lockmgr(&lock, LK_SHARED); 421 TAILQ_FOREACH(lf, &linker_files, link) { 422 retval = predicate(lf, context); 423 if (retval != 0) 424 break; 425 } 426 lockmgr(&lock, LK_RELEASE); 427 return (retval); 428 } 429 430 linker_file_t 431 linker_make_file(const char* pathname, void* priv, struct linker_file_ops* ops) 432 { 433 linker_file_t lf = 0; 434 const char *filename; 435 436 filename = rindex(pathname, '/'); 437 if (filename && filename[1]) 438 filename++; 439 else 440 filename = pathname; 441 442 KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename)); 443 lockmgr(&lock, LK_EXCLUSIVE); 444 lf = kmalloc(sizeof(struct linker_file), M_LINKER, M_WAITOK); 445 bzero(lf, sizeof(*lf)); 446 447 lf->refs = 1; 448 lf->userrefs = 0; 449 lf->flags = 0; 450 lf->filename = linker_strdup(filename); 451 lf->id = next_file_id++; 452 lf->ndeps = 0; 453 lf->deps = NULL; 454 STAILQ_INIT(&lf->common); 455 TAILQ_INIT(&lf->modules); 456 457 lf->priv = priv; 458 lf->ops = ops; 459 TAILQ_INSERT_TAIL(&linker_files, lf, link); 460 461 lockmgr(&lock, LK_RELEASE); 462 return lf; 463 } 464 465 int 466 linker_file_unload(linker_file_t file) 467 { 468 module_t mod, next;; 469 modlist_t ml, nextml; 470 struct common_symbol* cp; 471 int error = 0; 472 int i; 473 474 /* Refuse to unload modules if securelevel raised */ 475 if (securelevel > 0 || kernel_mem_readonly) 476 return EPERM; 477 478 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 479 480 lockmgr(&lock, LK_EXCLUSIVE); 481 482 /* Easy case of just dropping a reference. */ 483 if (file->refs > 1) { 484 file->refs--; 485 lockmgr(&lock, LK_RELEASE); 486 return (0); 487 } 488 489 KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n")); 490 491 /* 492 * Inform any modules associated with this file. 493 */ 494 mod = TAILQ_FIRST(&file->modules); 495 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 496 next = module_getfnext(mod); 497 498 /* 499 * Give the module a chance to veto the unload. Note that the 500 * act of unloading the module may cause other modules in the 501 * same file list to be unloaded recursively. 502 */ 503 if ((error = module_unload(mod)) != 0) { 504 KLD_DPF(FILE, ("linker_file_unload: module %p vetoes unload\n", 505 mod)); 506 lockmgr(&lock, LK_RELEASE); 507 file->refs--; 508 goto out; 509 } 510 module_release(mod); 511 } 512 513 TAILQ_FOREACH_MUTABLE(ml, &found_modules, link, nextml) { 514 if (ml->container == file) { 515 TAILQ_REMOVE(&found_modules, ml, link); 516 kfree(ml, M_LINKER); 517 } 518 } 519 520 /* Don't try to run SYSUNINITs if we are unloaded due to a link error */ 521 if (file->flags & LINKER_FILE_LINKED) { 522 file->flags &= ~LINKER_FILE_LINKED; 523 lockmgr(&lock, LK_RELEASE); 524 linker_file_sysuninit(file); 525 linker_file_unregister_sysctls(file); 526 lockmgr(&lock, LK_EXCLUSIVE); 527 } 528 529 TAILQ_REMOVE(&linker_files, file, link); 530 531 if (file->deps) { 532 lockmgr(&lock, LK_RELEASE); 533 for (i = 0; i < file->ndeps; i++) 534 linker_file_unload(file->deps[i]); 535 lockmgr(&lock, LK_EXCLUSIVE); 536 kfree(file->deps, M_LINKER); 537 file->deps = NULL; 538 } 539 540 while ((cp = STAILQ_FIRST(&file->common)) != NULL) { 541 STAILQ_REMOVE_HEAD(&file->common, link); 542 kfree(cp, M_LINKER); 543 } 544 545 file->ops->unload(file); 546 547 if (file->filename) { 548 kfree(file->filename, M_LINKER); 549 file->filename = NULL; 550 } 551 552 kfree(file, M_LINKER); 553 554 lockmgr(&lock, LK_RELEASE); 555 556 out: 557 return error; 558 } 559 560 void 561 linker_file_add_dependancy(linker_file_t file, linker_file_t dep) 562 { 563 linker_file_t* newdeps; 564 565 newdeps = kmalloc((file->ndeps + 1) * sizeof(linker_file_t*), 566 M_LINKER, M_WAITOK | M_ZERO); 567 568 if (file->deps) { 569 bcopy(file->deps, newdeps, file->ndeps * sizeof(linker_file_t*)); 570 kfree(file->deps, M_LINKER); 571 } 572 file->deps = newdeps; 573 file->deps[file->ndeps] = dep; 574 file->ndeps++; 575 } 576 577 /* 578 * Locate a linker set and its contents. 579 * This is a helper function to avoid linker_if.h exposure elsewhere. 580 * Note: firstp and lastp are really void *** 581 */ 582 int 583 linker_file_lookup_set(linker_file_t file, const char *name, 584 void *firstp, void *lastp, int *countp) 585 { 586 return file->ops->lookup_set(file, name, firstp, lastp, countp); 587 } 588 589 int 590 linker_file_lookup_symbol(linker_file_t file, const char* name, int deps, caddr_t *raddr) 591 { 592 c_linker_sym_t sym; 593 linker_symval_t symval; 594 linker_file_t lf; 595 size_t common_size = 0; 596 int i; 597 598 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n", 599 file, name, deps)); 600 601 if (file->ops->lookup_symbol(file, name, &sym) == 0) { 602 file->ops->symbol_values(file, sym, &symval); 603 604 /* 605 * XXX Assume a common symbol if its value is 0 and it has a non-zero 606 * size, otherwise it could be an absolute symbol with a value of 0. 607 */ 608 if (symval.value == 0 && symval.size != 0) { 609 /* 610 * For commons, first look them up in the dependancies and 611 * only allocate space if not found there. 612 */ 613 common_size = symval.size; 614 } else { 615 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol.value=%p\n", symval.value)); 616 *raddr = symval.value; 617 return 0; 618 } 619 } 620 if (deps) { 621 for (i = 0; i < file->ndeps; i++) { 622 if (linker_file_lookup_symbol(file->deps[i], name, 0, raddr) == 0) { 623 KLD_DPF(SYM, ("linker_file_lookup_symbol: deps value=%p\n", *raddr)); 624 return 0; 625 } 626 } 627 628 /* If we have not found it in the dependencies, search globally */ 629 TAILQ_FOREACH(lf, &linker_files, link) { 630 /* But skip the current file if it's on the list */ 631 if (lf == file) 632 continue; 633 /* And skip the files we searched above */ 634 for (i = 0; i < file->ndeps; i++) 635 if (lf == file->deps[i]) 636 break; 637 if (i < file->ndeps) 638 continue; 639 if (linker_file_lookup_symbol(lf, name, 0, raddr) == 0) { 640 KLD_DPF(SYM, ("linker_file_lookup_symbol: global value=%p\n", *raddr)); 641 return 0; 642 } 643 } 644 } 645 646 if (common_size > 0) { 647 /* 648 * This is a common symbol which was not found in the 649 * dependancies. We maintain a simple common symbol table in 650 * the file object. 651 */ 652 struct common_symbol* cp; 653 654 STAILQ_FOREACH(cp, &file->common, link) 655 if (!strcmp(cp->name, name)) { 656 KLD_DPF(SYM, ("linker_file_lookup_symbol: old common value=%p\n", cp->address)); 657 *raddr = cp->address; 658 return 0; 659 } 660 661 /* 662 * Round the symbol size up to align. 663 */ 664 common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 665 cp = kmalloc(sizeof(struct common_symbol) 666 + common_size 667 + strlen(name) + 1, 668 M_LINKER, M_WAITOK | M_ZERO); 669 670 cp->address = (caddr_t) (cp + 1); 671 cp->name = cp->address + common_size; 672 strcpy(cp->name, name); 673 bzero(cp->address, common_size); 674 STAILQ_INSERT_TAIL(&file->common, cp, link); 675 676 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common value=%p\n", cp->address)); 677 *raddr = cp->address; 678 return 0; 679 } 680 681 #ifdef _KERNEL_VIRTUAL 682 *raddr = dlsym(RTLD_NEXT, name); 683 if (*raddr != NULL) { 684 KLD_DPF(SYM, ("linker_file_lookup_symbol: found dlsym=%p\n", *raddr)); 685 return 0; 686 } 687 #endif 688 689 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 690 return ENOENT; 691 } 692 693 #ifdef DDB 694 /* 695 * DDB Helpers. DDB has to look across multiple files with their own 696 * symbol tables and string tables. 697 * 698 * Note that we do not obey list locking protocols here. We really don't 699 * need DDB to hang because somebody's got the lock held. We'll take the 700 * chance that the files list is inconsistant instead. 701 */ 702 703 int 704 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 705 { 706 linker_file_t lf; 707 708 TAILQ_FOREACH(lf, &linker_files, link) { 709 if (lf->ops->lookup_symbol(lf, symstr, sym) == 0) 710 return 0; 711 } 712 return ENOENT; 713 } 714 715 int 716 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 717 { 718 linker_file_t lf; 719 u_long off = (uintptr_t)value; 720 u_long diff, bestdiff; 721 c_linker_sym_t best; 722 c_linker_sym_t es; 723 724 best = 0; 725 bestdiff = off; 726 TAILQ_FOREACH(lf, &linker_files, link) { 727 if (lf->ops->search_symbol(lf, value, &es, &diff) != 0) 728 continue; 729 if (es != 0 && diff < bestdiff) { 730 best = es; 731 bestdiff = diff; 732 } 733 if (bestdiff == 0) 734 break; 735 } 736 if (best) { 737 *sym = best; 738 *diffp = bestdiff; 739 return 0; 740 } else { 741 *sym = 0; 742 *diffp = off; 743 return ENOENT; 744 } 745 } 746 747 int 748 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 749 { 750 linker_file_t lf; 751 752 TAILQ_FOREACH(lf, &linker_files, link) { 753 if (lf->ops->symbol_values(lf, sym, symval) == 0) 754 return 0; 755 } 756 return ENOENT; 757 } 758 759 #endif 760 761 /* 762 * Syscalls. 763 * 764 * MPALMOSTSAFE 765 */ 766 int 767 sys_kldload(struct kldload_args *uap) 768 { 769 struct thread *td = curthread; 770 char *file; 771 char *kldname, *modname; 772 linker_file_t lf; 773 int error = 0; 774 775 uap->sysmsg_result = -1; 776 777 if (securelevel > 0 || kernel_mem_readonly) /* redundant, but that's OK */ 778 return EPERM; 779 780 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0) 781 return error; 782 783 file = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); 784 if ((error = copyinstr(uap->file, file, MAXPATHLEN, NULL)) != 0) 785 goto out; 786 787 /* 788 * If file does not contain a qualified name or any dot in it 789 * (kldname.ko, or kldname.ver.ko) treat it as an interface 790 * name. 791 */ 792 if (index(file, '/') || index(file, '.')) { 793 kldname = file; 794 modname = NULL; 795 } else { 796 kldname = NULL; 797 modname = file; 798 } 799 800 get_mplock(); 801 error = linker_load_module(kldname, modname, NULL, NULL, &lf); 802 rel_mplock(); 803 if (error) 804 goto out; 805 806 lf->userrefs++; 807 uap->sysmsg_result = lf->id; 808 809 out: 810 if (file) 811 kfree(file, M_TEMP); 812 return error; 813 } 814 815 /* 816 * MPALMOSTSAFE 817 */ 818 int 819 sys_kldunload(struct kldunload_args *uap) 820 { 821 struct thread *td = curthread; 822 linker_file_t lf; 823 int error = 0; 824 825 if (securelevel > 0 || kernel_mem_readonly) /* redundant, but that's OK */ 826 return EPERM; 827 828 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0) 829 return error; 830 831 get_mplock(); 832 lf = linker_find_file_by_id(uap->fileid); 833 if (lf) { 834 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 835 if (lf->userrefs == 0) { 836 kprintf("linkerunload: attempt to unload file that was loaded by the kernel\n"); 837 error = EBUSY; 838 goto out; 839 } 840 lf->userrefs--; 841 error = linker_file_unload(lf); 842 if (error) 843 lf->userrefs++; 844 } else { 845 error = ENOENT; 846 } 847 out: 848 rel_mplock(); 849 return error; 850 } 851 852 /* 853 * MPALMOSTSAFE 854 */ 855 int 856 sys_kldfind(struct kldfind_args *uap) 857 { 858 char *filename = NULL, *modulename; 859 linker_file_t lf; 860 int error; 861 862 uap->sysmsg_result = -1; 863 864 filename = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); 865 if ((error = copyinstr(uap->file, filename, MAXPATHLEN, NULL)) != 0) 866 goto out; 867 868 modulename = rindex(filename, '/'); 869 if (modulename == NULL) 870 modulename = filename; 871 872 get_mplock(); 873 lf = linker_find_file_by_name(modulename); 874 if (lf) 875 uap->sysmsg_result = lf->id; 876 else 877 error = ENOENT; 878 rel_mplock(); 879 880 out: 881 if (filename) 882 kfree(filename, M_TEMP); 883 return error; 884 } 885 886 /* 887 * MPALMOSTSAFE 888 */ 889 int 890 sys_kldnext(struct kldnext_args *uap) 891 { 892 linker_file_t lf; 893 int error = 0; 894 895 get_mplock(); 896 if (uap->fileid == 0) { 897 lf = TAILQ_FIRST(&linker_files); 898 } else { 899 lf = linker_find_file_by_id(uap->fileid); 900 if (lf == NULL) { 901 error = ENOENT; 902 goto out; 903 } 904 lf = TAILQ_NEXT(lf, link); 905 } 906 907 /* Skip partially loaded files. */ 908 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED)) { 909 lf = TAILQ_NEXT(lf, link); 910 } 911 912 if (lf) 913 uap->sysmsg_result = lf->id; 914 else 915 uap->sysmsg_result = 0; 916 917 out: 918 rel_mplock(); 919 return error; 920 } 921 922 /* 923 * MPALMOSTSAFE 924 */ 925 int 926 sys_kldstat(struct kldstat_args *uap) 927 { 928 linker_file_t lf; 929 int error = 0; 930 int version; 931 struct kld_file_stat* stat; 932 int namelen; 933 934 get_mplock(); 935 lf = linker_find_file_by_id(uap->fileid); 936 if (!lf) { 937 error = ENOENT; 938 goto out; 939 } 940 941 stat = uap->stat; 942 943 /* 944 * Check the version of the user's structure. 945 */ 946 if ((error = copyin(&stat->version, &version, sizeof(version))) != 0) 947 goto out; 948 if (version != sizeof(struct kld_file_stat)) { 949 error = EINVAL; 950 goto out; 951 } 952 953 namelen = strlen(lf->filename) + 1; 954 if (namelen > MAXPATHLEN) 955 namelen = MAXPATHLEN; 956 if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0) 957 goto out; 958 if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0) 959 goto out; 960 if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0) 961 goto out; 962 if ((error = copyout(&lf->address, &stat->address, sizeof(caddr_t))) != 0) 963 goto out; 964 if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0) 965 goto out; 966 967 uap->sysmsg_result = 0; 968 969 out: 970 rel_mplock(); 971 return error; 972 } 973 974 /* 975 * MPALMOSTSAFE 976 */ 977 int 978 sys_kldfirstmod(struct kldfirstmod_args *uap) 979 { 980 linker_file_t lf; 981 int error = 0; 982 983 get_mplock(); 984 lf = linker_find_file_by_id(uap->fileid); 985 if (lf) { 986 if (TAILQ_FIRST(&lf->modules)) 987 uap->sysmsg_result = module_getid(TAILQ_FIRST(&lf->modules)); 988 else 989 uap->sysmsg_result = 0; 990 } else { 991 error = ENOENT; 992 } 993 rel_mplock(); 994 995 return error; 996 } 997 998 /* 999 * MPALMOSTSAFE 1000 */ 1001 int 1002 sys_kldsym(struct kldsym_args *uap) 1003 { 1004 char *symstr = NULL; 1005 c_linker_sym_t sym; 1006 linker_symval_t symval; 1007 linker_file_t lf; 1008 struct kld_sym_lookup lookup; 1009 int error = 0; 1010 1011 get_mplock(); 1012 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0) 1013 goto out; 1014 if (lookup.version != sizeof(lookup) || uap->cmd != KLDSYM_LOOKUP) { 1015 error = EINVAL; 1016 goto out; 1017 } 1018 1019 symstr = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1020 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 1021 goto out; 1022 1023 if (uap->fileid != 0) { 1024 lf = linker_find_file_by_id(uap->fileid); 1025 if (lf == NULL) { 1026 error = ENOENT; 1027 goto out; 1028 } 1029 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 && 1030 lf->ops->symbol_values(lf, sym, &symval) == 0) { 1031 lookup.symvalue = (uintptr_t)symval.value; 1032 lookup.symsize = symval.size; 1033 error = copyout(&lookup, uap->data, sizeof(lookup)); 1034 } else 1035 error = ENOENT; 1036 } else { 1037 TAILQ_FOREACH(lf, &linker_files, link) { 1038 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 && 1039 lf->ops->symbol_values(lf, sym, &symval) == 0) { 1040 lookup.symvalue = (uintptr_t)symval.value; 1041 lookup.symsize = symval.size; 1042 error = copyout(&lookup, uap->data, sizeof(lookup)); 1043 break; 1044 } 1045 } 1046 if (!lf) 1047 error = ENOENT; 1048 } 1049 out: 1050 rel_mplock(); 1051 if (symstr) 1052 kfree(symstr, M_TEMP); 1053 return error; 1054 } 1055 1056 /* 1057 * Preloaded module support 1058 */ 1059 1060 static modlist_t 1061 modlist_lookup(const char *name, int ver) 1062 { 1063 modlist_t mod; 1064 1065 TAILQ_FOREACH(mod, &found_modules, link) { 1066 if (strcmp(mod->name, name) == 0 && (ver == 0 || mod->version == ver)) 1067 return (mod); 1068 } 1069 return (NULL); 1070 } 1071 1072 static modlist_t 1073 modlist_lookup2(const char *name, struct mod_depend *verinfo) 1074 { 1075 modlist_t mod, bestmod; 1076 int ver; 1077 1078 if (verinfo == NULL) 1079 return (modlist_lookup(name, 0)); 1080 bestmod = NULL; 1081 TAILQ_FOREACH(mod, &found_modules, link) { 1082 if (strcmp(mod->name, name) != 0) 1083 continue; 1084 ver = mod->version; 1085 if (ver == verinfo->md_ver_preferred) 1086 return (mod); 1087 if (ver >= verinfo->md_ver_minimum && 1088 ver <= verinfo->md_ver_maximum && 1089 (bestmod == NULL || ver > bestmod->version)) 1090 bestmod = mod; 1091 } 1092 return (bestmod); 1093 } 1094 1095 int 1096 linker_reference_module(const char *modname, struct mod_depend *verinfo, 1097 linker_file_t *result) 1098 { 1099 modlist_t mod; 1100 int error; 1101 1102 lockmgr(&lock, LK_SHARED); 1103 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) { 1104 *result = mod->container; 1105 (*result)->refs++; 1106 lockmgr(&lock, LK_RELEASE); 1107 return (0); 1108 } 1109 1110 lockmgr(&lock, LK_RELEASE); 1111 get_mplock(); 1112 error = linker_load_module(NULL, modname, NULL, verinfo, result); 1113 rel_mplock(); 1114 return (error); 1115 } 1116 1117 int 1118 linker_release_module(const char *modname, struct mod_depend *verinfo, 1119 linker_file_t lf) 1120 { 1121 modlist_t mod; 1122 int error; 1123 1124 lockmgr(&lock, LK_SHARED); 1125 if (lf == NULL) { 1126 KASSERT(modname != NULL, 1127 ("linker_release_module: no file or name")); 1128 mod = modlist_lookup2(modname, verinfo); 1129 if (mod == NULL) { 1130 lockmgr(&lock, LK_RELEASE); 1131 return (ESRCH); 1132 } 1133 lf = mod->container; 1134 } else 1135 KASSERT(modname == NULL && verinfo == NULL, 1136 ("linker_release_module: both file and name")); 1137 lockmgr(&lock, LK_RELEASE); 1138 get_mplock(); 1139 error = linker_file_unload(lf); 1140 rel_mplock(); 1141 return (error); 1142 } 1143 1144 static modlist_t 1145 modlist_newmodule(const char *modname, int version, linker_file_t container) 1146 { 1147 modlist_t mod; 1148 1149 mod = kmalloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO); 1150 if (mod == NULL) 1151 panic("no memory for module list"); 1152 mod->container = container; 1153 mod->name = modname; 1154 mod->version = version; 1155 TAILQ_INSERT_TAIL(&found_modules, mod, link); 1156 return (mod); 1157 } 1158 1159 static void 1160 linker_addmodules(linker_file_t lf, struct mod_metadata **start, 1161 struct mod_metadata **stop, int preload) 1162 { 1163 struct mod_metadata *mp, **mdp; 1164 const char *modname; 1165 int ver; 1166 1167 for (mdp = start; mdp < stop; mdp++) { 1168 mp = *mdp; 1169 if (mp->md_type != MDT_VERSION) 1170 continue; 1171 modname = mp->md_cval; 1172 ver = ((struct mod_version *)mp->md_data)->mv_version; 1173 if (modlist_lookup(modname, ver) != NULL) { 1174 kprintf("module %s already present!\n", modname); 1175 /* XXX what can we do? this is a build error. :-( */ 1176 continue; 1177 } 1178 modlist_newmodule(modname, ver, lf); 1179 } 1180 } 1181 1182 static void 1183 linker_preload(void* arg) 1184 { 1185 caddr_t modptr; 1186 const char *modname, *nmodname; 1187 char *modtype; 1188 linker_file_t lf, nlf; 1189 linker_class_t lc; 1190 int error; 1191 linker_file_list_t loaded_files; 1192 linker_file_list_t depended_files; 1193 struct mod_metadata *mp, *nmp; 1194 struct mod_metadata **start, **stop, **mdp, **nmdp; 1195 struct mod_depend *verinfo; 1196 int nver; 1197 int resolves; 1198 modlist_t mod; 1199 struct sysinit **si_start, **si_stop; 1200 1201 TAILQ_INIT(&loaded_files); 1202 TAILQ_INIT(&depended_files); 1203 TAILQ_INIT(&found_modules); 1204 1205 modptr = NULL; 1206 while ((modptr = preload_search_next_name(modptr)) != NULL) { 1207 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 1208 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 1209 if (modname == NULL) { 1210 kprintf("Preloaded module at %p does not have a name!\n", modptr); 1211 continue; 1212 } 1213 if (modtype == NULL) { 1214 kprintf("Preloaded module at %p does not have a type!\n", modptr); 1215 continue; 1216 } 1217 1218 if (bootverbose) 1219 kprintf("Preloaded %s \"%s\" at %p.\n", modtype, modname, modptr); 1220 lf = NULL; 1221 TAILQ_FOREACH(lc, &classes, link) { 1222 error = lc->ops->preload_file(modname, &lf); 1223 if (!error) 1224 break; 1225 lf = NULL; 1226 } 1227 if (lf) 1228 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 1229 } 1230 1231 /* 1232 * First get a list of stuff in the kernel. 1233 */ 1234 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, 1235 &stop, NULL) == 0) 1236 linker_addmodules(linker_kernel_file, start, stop, 1); 1237 1238 /* 1239 * This is a once-off kinky bubble sort to resolve relocation 1240 * dependency requirements. 1241 */ 1242 restart: 1243 TAILQ_FOREACH(lf, &loaded_files, loaded) { 1244 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, NULL); 1245 /* 1246 * First, look to see if we would successfully link with this 1247 * stuff. 1248 */ 1249 resolves = 1; /* unless we know otherwise */ 1250 if (!error) { 1251 for (mdp = start; mdp < stop; mdp++) { 1252 mp = *mdp; 1253 if (mp->md_type != MDT_DEPEND) 1254 continue; 1255 modname = mp->md_cval; 1256 verinfo = mp->md_data; 1257 for (nmdp = start; nmdp < stop; nmdp++) { 1258 nmp = *nmdp; 1259 if (nmp->md_type != MDT_VERSION) 1260 continue; 1261 nmodname = nmp->md_cval; 1262 if (strcmp(modname, nmodname) == 0) 1263 break; 1264 } 1265 if (nmdp < stop)/* it's a self reference */ 1266 continue; 1267 1268 /* 1269 * ok, the module isn't here yet, we 1270 * are not finished 1271 */ 1272 if (modlist_lookup2(modname, verinfo) == NULL) 1273 resolves = 0; 1274 } 1275 } 1276 /* 1277 * OK, if we found our modules, we can link. So, "provide" 1278 * the modules inside and add it to the end of the link order 1279 * list. 1280 */ 1281 if (resolves) { 1282 if (!error) { 1283 for (mdp = start; mdp < stop; mdp++) { 1284 mp = *mdp; 1285 if (mp->md_type != MDT_VERSION) 1286 continue; 1287 modname = mp->md_cval; 1288 nver = ((struct mod_version *)mp->md_data)->mv_version; 1289 if (modlist_lookup(modname, nver) != NULL) { 1290 kprintf("module %s already present!\n", modname); 1291 TAILQ_REMOVE(&loaded_files, lf, loaded); 1292 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ ); 1293 /* we changed tailq next ptr */ 1294 goto restart; 1295 } 1296 modlist_newmodule(modname, nver, lf); 1297 } 1298 } 1299 TAILQ_REMOVE(&loaded_files, lf, loaded); 1300 TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 1301 /* 1302 * Since we provided modules, we need to restart the 1303 * sort so that the previous files that depend on us 1304 * have a chance. Also, we've busted the tailq next 1305 * pointer with the REMOVE. 1306 */ 1307 goto restart; 1308 } 1309 } 1310 1311 /* 1312 * At this point, we check to see what could not be resolved.. 1313 */ 1314 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) { 1315 TAILQ_REMOVE(&loaded_files, lf, loaded); 1316 kprintf("KLD file %s is missing dependencies\n", lf->filename); 1317 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ ); 1318 } 1319 1320 /* 1321 * We made it. Finish off the linking in the order we determined. 1322 */ 1323 TAILQ_FOREACH_MUTABLE(lf, &depended_files, loaded, nlf) { 1324 if (linker_kernel_file) { 1325 linker_kernel_file->refs++; 1326 linker_file_add_dependancy(lf, linker_kernel_file); 1327 } 1328 lf->userrefs++; 1329 1330 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, NULL); 1331 if (!error) { 1332 for (mdp = start; mdp < stop; mdp++) { 1333 mp = *mdp; 1334 if (mp->md_type != MDT_DEPEND) 1335 continue; 1336 modname = mp->md_cval; 1337 verinfo = mp->md_data; 1338 mod = modlist_lookup2(modname, verinfo); 1339 /* Don't count self-dependencies */ 1340 if (lf == mod->container) 1341 continue; 1342 mod->container->refs++; 1343 linker_file_add_dependancy(lf, mod->container); 1344 } 1345 } 1346 /* 1347 * Now do relocation etc using the symbol search paths 1348 * established by the dependencies 1349 */ 1350 error = lf->ops->preload_finish(lf); 1351 if (error) { 1352 TAILQ_REMOVE(&depended_files, lf, loaded); 1353 kprintf("KLD file %s - could not finalize loading\n", 1354 lf->filename); 1355 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */); 1356 continue; 1357 } 1358 linker_file_register_modules(lf); 1359 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, &si_stop, NULL) == 0) 1360 sysinit_add(si_start, si_stop); 1361 linker_file_register_sysctls(lf); 1362 lf->flags |= LINKER_FILE_LINKED; 1363 } 1364 /* woohoo! we made it! */ 1365 } 1366 1367 SYSINIT(preload, SI_BOOT2_KLD, SI_ORDER_MIDDLE, linker_preload, 0); 1368 1369 /* 1370 * Search for a not-loaded module by name. 1371 * 1372 * Modules may be found in the following locations: 1373 * 1374 * - preloaded (result is just the module name) 1375 * - on disk (result is full path to module) 1376 * 1377 * If the module name is qualified in any way (contains path, etc.) 1378 * the we simply return a copy of it. 1379 * 1380 * The search path can be manipulated via sysctl. Note that we use the ';' 1381 * character as a separator to be consistent with the bootloader. 1382 */ 1383 1384 static char linker_path[MAXPATHLEN] = "/boot;/boot/modules;/;/modules"; 1385 1386 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path, 1387 sizeof(linker_path), "module load search path"); 1388 TUNABLE_STR("module_path", linker_path, sizeof(linker_path)); 1389 1390 char * 1391 linker_search_path(const char *name) 1392 { 1393 struct nlookupdata nd; 1394 char *cp, *ep, *result; 1395 size_t name_len, prefix_len; 1396 size_t result_len; 1397 int sep; 1398 int error; 1399 enum vtype type; 1400 const char *exts[] = { "", ".ko", NULL }; 1401 const char **ext; 1402 1403 /* qualified at all? */ 1404 if (index(name, '/')) 1405 return(linker_strdup(name)); 1406 1407 /* traverse the linker path */ 1408 cp = linker_path; 1409 name_len = strlen(name); 1410 for (;;) { 1411 1412 /* find the end of this component */ 1413 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++) 1414 ; 1415 prefix_len = ep - cp; 1416 /* if this component doesn't end with a slash, add one */ 1417 if (ep == cp || *(ep - 1) != '/') 1418 sep = 1; 1419 else 1420 sep = 0; 1421 1422 /* 1423 * +2+3 : possible separator, plus terminator + possible extension. 1424 */ 1425 result = kmalloc(prefix_len + name_len + 2+3, M_LINKER, M_WAITOK); 1426 1427 strncpy(result, cp, prefix_len); 1428 if (sep) 1429 result[prefix_len++] = '/'; 1430 strcpy(result + prefix_len, name); 1431 1432 result_len = strlen(result); 1433 for (ext = exts; *ext != NULL; ext++) { 1434 strcpy(result + result_len, *ext); 1435 1436 /* 1437 * Attempt to open the file, and return the path if we succeed and it's 1438 * a regular file. 1439 */ 1440 error = nlookup_init(&nd, result, UIO_SYSSPACE, NLC_FOLLOW|NLC_LOCKVP); 1441 if (error == 0) 1442 error = vn_open(&nd, NULL, FREAD, 0); 1443 if (error == 0) { 1444 type = nd.nl_open_vp->v_type; 1445 if (type == VREG) { 1446 nlookup_done(&nd); 1447 return (result); 1448 } 1449 } 1450 nlookup_done(&nd); 1451 } 1452 1453 kfree(result, M_LINKER); 1454 1455 if (*ep == 0) 1456 break; 1457 cp = ep + 1; 1458 } 1459 return(NULL); 1460 } 1461 1462 /* 1463 * Find a file which contains given module and load it, if "parent" is not 1464 * NULL, register a reference to it. 1465 */ 1466 static int 1467 linker_load_module(const char *kldname, const char *modname, 1468 struct linker_file *parent, struct mod_depend *verinfo, 1469 struct linker_file **lfpp) 1470 { 1471 linker_file_t lfdep; 1472 const char *filename; 1473 char *pathname; 1474 int error; 1475 1476 if (modname == NULL) { 1477 /* 1478 * We have to load KLD 1479 */ 1480 KASSERT(verinfo == NULL, ("linker_load_module: verinfo is not NULL")); 1481 pathname = linker_search_path(kldname); 1482 } else { 1483 if (modlist_lookup2(modname, verinfo) != NULL) 1484 return (EEXIST); 1485 if (kldname != NULL) 1486 { 1487 pathname = linker_strdup(kldname); 1488 } 1489 else if (rootvnode == NULL) 1490 pathname = NULL; 1491 else 1492 { 1493 pathname = linker_search_path(modname); 1494 } 1495 #if 0 1496 /* 1497 * Need to find a KLD with required module 1498 */ 1499 pathname = linker_search_module(modname, 1500 strlen(modname), verinfo); 1501 #endif 1502 } 1503 if (pathname == NULL) 1504 return (ENOENT); 1505 1506 /* 1507 * Can't load more than one file with the same basename XXX: 1508 * Actually it should be possible to have multiple KLDs with 1509 * the same basename but different path because they can 1510 * provide different versions of the same modules. 1511 */ 1512 filename = rindex(pathname, '/'); 1513 if (filename == NULL) 1514 filename = filename; 1515 else 1516 filename++; 1517 if (linker_find_file_by_name(filename)) 1518 error = EEXIST; 1519 else 1520 do { 1521 error = linker_load_file(pathname, &lfdep); 1522 if (error) 1523 break; 1524 if (modname && verinfo && modlist_lookup2(modname, verinfo) == NULL) { 1525 linker_file_unload(lfdep /* , LINKER_UNLOAD_FORCE */ ); 1526 error = ENOENT; 1527 break; 1528 } 1529 if (parent) { 1530 linker_file_add_dependancy(parent, lfdep); 1531 } 1532 if (lfpp) 1533 *lfpp = lfdep; 1534 } while (0); 1535 kfree(pathname, M_LINKER); 1536 return (error); 1537 } 1538 1539 /* 1540 * This routine is responsible for finding dependencies of userland initiated 1541 * kldload(2)'s of files. 1542 */ 1543 int 1544 linker_load_dependencies(linker_file_t lf) 1545 { 1546 linker_file_t lfdep; 1547 struct mod_metadata **start, **stop, **mdp, **nmdp; 1548 struct mod_metadata *mp, *nmp; 1549 struct mod_depend *verinfo; 1550 modlist_t mod; 1551 const char *modname, *nmodname; 1552 int ver, error = 0, count; 1553 1554 /* 1555 * All files are dependant on /kernel. 1556 */ 1557 if (linker_kernel_file) { 1558 linker_kernel_file->refs++; 1559 linker_file_add_dependancy(lf, linker_kernel_file); 1560 } 1561 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, &count) != 0) 1562 return (0); 1563 for (mdp = start; mdp < stop; mdp++) { 1564 mp = *mdp; 1565 if (mp->md_type != MDT_VERSION) 1566 continue; 1567 modname = mp->md_cval; 1568 ver = ((struct mod_version *)mp->md_data)->mv_version; 1569 mod = modlist_lookup(modname, ver); 1570 if (mod != NULL) { 1571 kprintf("interface %s.%d already present in the KLD '%s'!\n", 1572 modname, ver, mod->container->filename); 1573 return (EEXIST); 1574 } 1575 } 1576 1577 for (mdp = start; mdp < stop; mdp++) { 1578 mp = *mdp; 1579 if (mp->md_type != MDT_DEPEND) 1580 continue; 1581 modname = mp->md_cval; 1582 verinfo = mp->md_data; 1583 nmodname = NULL; 1584 for (nmdp = start; nmdp < stop; nmdp++) { 1585 nmp = *nmdp; 1586 if (nmp->md_type != MDT_VERSION) 1587 continue; 1588 nmodname = nmp->md_cval; 1589 if (strcmp(modname, nmodname) == 0) 1590 break; 1591 } 1592 if (nmdp < stop) /* early exit, it's a self reference */ 1593 continue; 1594 mod = modlist_lookup2(modname, verinfo); 1595 if (mod) { /* woohoo, it's loaded already */ 1596 lfdep = mod->container; 1597 lfdep->refs++; 1598 linker_file_add_dependancy(lf, lfdep); 1599 continue; 1600 } 1601 error = linker_load_module(NULL, modname, lf, verinfo, NULL); 1602 if (error) { 1603 kprintf("KLD %s: depends on %s - not available or version mismatch\n", 1604 lf->filename, modname); 1605 break; 1606 } 1607 } 1608 1609 if (error) 1610 return (error); 1611 linker_addmodules(lf, start, stop, 0); 1612 return (error); 1613 } 1614