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 linker_file_t 415 linker_make_file(const char* pathname, void* priv, struct linker_file_ops* ops) 416 { 417 linker_file_t lf = 0; 418 const char *filename; 419 420 filename = rindex(pathname, '/'); 421 if (filename && filename[1]) 422 filename++; 423 else 424 filename = pathname; 425 426 KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename)); 427 lockmgr(&lock, LK_EXCLUSIVE); 428 lf = kmalloc(sizeof(struct linker_file), M_LINKER, M_WAITOK); 429 bzero(lf, sizeof(*lf)); 430 431 lf->refs = 1; 432 lf->userrefs = 0; 433 lf->flags = 0; 434 lf->filename = linker_strdup(filename); 435 lf->id = next_file_id++; 436 lf->ndeps = 0; 437 lf->deps = NULL; 438 STAILQ_INIT(&lf->common); 439 TAILQ_INIT(&lf->modules); 440 441 lf->priv = priv; 442 lf->ops = ops; 443 TAILQ_INSERT_TAIL(&linker_files, lf, link); 444 445 lockmgr(&lock, LK_RELEASE); 446 return lf; 447 } 448 449 int 450 linker_file_unload(linker_file_t file) 451 { 452 module_t mod, next;; 453 modlist_t ml, nextml; 454 struct common_symbol* cp; 455 int error = 0; 456 int i; 457 458 /* Refuse to unload modules if securelevel raised */ 459 if (securelevel > 0 || kernel_mem_readonly) 460 return EPERM; 461 462 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 463 464 lockmgr(&lock, LK_EXCLUSIVE); 465 466 /* Easy case of just dropping a reference. */ 467 if (file->refs > 1) { 468 file->refs--; 469 lockmgr(&lock, LK_RELEASE); 470 return (0); 471 } 472 473 KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n")); 474 475 /* 476 * Inform any modules associated with this file. 477 */ 478 mod = TAILQ_FIRST(&file->modules); 479 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 480 next = module_getfnext(mod); 481 482 /* 483 * Give the module a chance to veto the unload. Note that the 484 * act of unloading the module may cause other modules in the 485 * same file list to be unloaded recursively. 486 */ 487 if ((error = module_unload(mod)) != 0) { 488 KLD_DPF(FILE, ("linker_file_unload: module %p vetoes unload\n", 489 mod)); 490 lockmgr(&lock, LK_RELEASE); 491 file->refs--; 492 goto out; 493 } 494 module_release(mod); 495 } 496 497 TAILQ_FOREACH_MUTABLE(ml, &found_modules, link, nextml) { 498 if (ml->container == file) { 499 TAILQ_REMOVE(&found_modules, ml, link); 500 kfree(ml, M_LINKER); 501 } 502 } 503 504 /* Don't try to run SYSUNINITs if we are unloaded due to a link error */ 505 if (file->flags & LINKER_FILE_LINKED) { 506 file->flags &= ~LINKER_FILE_LINKED; 507 lockmgr(&lock, LK_RELEASE); 508 linker_file_sysuninit(file); 509 linker_file_unregister_sysctls(file); 510 lockmgr(&lock, LK_EXCLUSIVE); 511 } 512 513 TAILQ_REMOVE(&linker_files, file, link); 514 515 if (file->deps) { 516 lockmgr(&lock, LK_RELEASE); 517 for (i = 0; i < file->ndeps; i++) 518 linker_file_unload(file->deps[i]); 519 lockmgr(&lock, LK_EXCLUSIVE); 520 kfree(file->deps, M_LINKER); 521 file->deps = NULL; 522 } 523 524 while ((cp = STAILQ_FIRST(&file->common)) != NULL) { 525 STAILQ_REMOVE_HEAD(&file->common, link); 526 kfree(cp, M_LINKER); 527 } 528 529 file->ops->unload(file); 530 531 if (file->filename) { 532 kfree(file->filename, M_LINKER); 533 file->filename = NULL; 534 } 535 536 kfree(file, M_LINKER); 537 538 lockmgr(&lock, LK_RELEASE); 539 540 out: 541 return error; 542 } 543 544 void 545 linker_file_add_dependancy(linker_file_t file, linker_file_t dep) 546 { 547 linker_file_t* newdeps; 548 549 newdeps = kmalloc((file->ndeps + 1) * sizeof(linker_file_t*), 550 M_LINKER, M_WAITOK | M_ZERO); 551 552 if (file->deps) { 553 bcopy(file->deps, newdeps, file->ndeps * sizeof(linker_file_t*)); 554 kfree(file->deps, M_LINKER); 555 } 556 file->deps = newdeps; 557 file->deps[file->ndeps] = dep; 558 file->ndeps++; 559 } 560 561 /* 562 * Locate a linker set and its contents. 563 * This is a helper function to avoid linker_if.h exposure elsewhere. 564 * Note: firstp and lastp are really void *** 565 */ 566 int 567 linker_file_lookup_set(linker_file_t file, const char *name, 568 void *firstp, void *lastp, int *countp) 569 { 570 return file->ops->lookup_set(file, name, firstp, lastp, countp); 571 } 572 573 int 574 linker_file_lookup_symbol(linker_file_t file, const char* name, int deps, caddr_t *raddr) 575 { 576 c_linker_sym_t sym; 577 linker_symval_t symval; 578 linker_file_t lf; 579 size_t common_size = 0; 580 int i; 581 582 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n", 583 file, name, deps)); 584 585 if (file->ops->lookup_symbol(file, name, &sym) == 0) { 586 file->ops->symbol_values(file, sym, &symval); 587 588 /* 589 * XXX Assume a common symbol if its value is 0 and it has a non-zero 590 * size, otherwise it could be an absolute symbol with a value of 0. 591 */ 592 if (symval.value == 0 && symval.size != 0) { 593 /* 594 * For commons, first look them up in the dependancies and 595 * only allocate space if not found there. 596 */ 597 common_size = symval.size; 598 } else { 599 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol.value=%p\n", symval.value)); 600 *raddr = symval.value; 601 return 0; 602 } 603 } 604 if (deps) { 605 for (i = 0; i < file->ndeps; i++) { 606 if (linker_file_lookup_symbol(file->deps[i], name, 0, raddr) == 0) { 607 KLD_DPF(SYM, ("linker_file_lookup_symbol: deps value=%p\n", *raddr)); 608 return 0; 609 } 610 } 611 612 /* If we have not found it in the dependencies, search globally */ 613 TAILQ_FOREACH(lf, &linker_files, link) { 614 /* But skip the current file if it's on the list */ 615 if (lf == file) 616 continue; 617 /* And skip the files we searched above */ 618 for (i = 0; i < file->ndeps; i++) 619 if (lf == file->deps[i]) 620 break; 621 if (i < file->ndeps) 622 continue; 623 if (linker_file_lookup_symbol(lf, name, 0, raddr) == 0) { 624 KLD_DPF(SYM, ("linker_file_lookup_symbol: global value=%p\n", *raddr)); 625 return 0; 626 } 627 } 628 } 629 630 if (common_size > 0) { 631 /* 632 * This is a common symbol which was not found in the 633 * dependancies. We maintain a simple common symbol table in 634 * the file object. 635 */ 636 struct common_symbol* cp; 637 638 STAILQ_FOREACH(cp, &file->common, link) 639 if (!strcmp(cp->name, name)) { 640 KLD_DPF(SYM, ("linker_file_lookup_symbol: old common value=%p\n", cp->address)); 641 *raddr = cp->address; 642 return 0; 643 } 644 645 /* 646 * Round the symbol size up to align. 647 */ 648 common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 649 cp = kmalloc(sizeof(struct common_symbol) 650 + common_size 651 + strlen(name) + 1, 652 M_LINKER, M_WAITOK | M_ZERO); 653 654 cp->address = (caddr_t) (cp + 1); 655 cp->name = cp->address + common_size; 656 strcpy(cp->name, name); 657 bzero(cp->address, common_size); 658 STAILQ_INSERT_TAIL(&file->common, cp, link); 659 660 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common value=%p\n", cp->address)); 661 *raddr = cp->address; 662 return 0; 663 } 664 665 #ifdef _KERNEL_VIRTUAL 666 *raddr = dlsym(RTLD_NEXT, name); 667 if (*raddr != NULL) { 668 KLD_DPF(SYM, ("linker_file_lookup_symbol: found dlsym=%p\n", *raddr)); 669 return 0; 670 } 671 #endif 672 673 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 674 return ENOENT; 675 } 676 677 #ifdef DDB 678 /* 679 * DDB Helpers. DDB has to look across multiple files with their own 680 * symbol tables and string tables. 681 * 682 * Note that we do not obey list locking protocols here. We really don't 683 * need DDB to hang because somebody's got the lock held. We'll take the 684 * chance that the files list is inconsistant instead. 685 */ 686 687 int 688 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 689 { 690 linker_file_t lf; 691 692 TAILQ_FOREACH(lf, &linker_files, link) { 693 if (lf->ops->lookup_symbol(lf, symstr, sym) == 0) 694 return 0; 695 } 696 return ENOENT; 697 } 698 699 int 700 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 701 { 702 linker_file_t lf; 703 u_long off = (uintptr_t)value; 704 u_long diff, bestdiff; 705 c_linker_sym_t best; 706 c_linker_sym_t es; 707 708 best = 0; 709 bestdiff = off; 710 TAILQ_FOREACH(lf, &linker_files, link) { 711 if (lf->ops->search_symbol(lf, value, &es, &diff) != 0) 712 continue; 713 if (es != 0 && diff < bestdiff) { 714 best = es; 715 bestdiff = diff; 716 } 717 if (bestdiff == 0) 718 break; 719 } 720 if (best) { 721 *sym = best; 722 *diffp = bestdiff; 723 return 0; 724 } else { 725 *sym = 0; 726 *diffp = off; 727 return ENOENT; 728 } 729 } 730 731 int 732 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 733 { 734 linker_file_t lf; 735 736 TAILQ_FOREACH(lf, &linker_files, link) { 737 if (lf->ops->symbol_values(lf, sym, symval) == 0) 738 return 0; 739 } 740 return ENOENT; 741 } 742 743 #endif 744 745 /* 746 * Syscalls. 747 * 748 * MPALMOSTSAFE 749 */ 750 int 751 sys_kldload(struct kldload_args *uap) 752 { 753 struct thread *td = curthread; 754 char *file; 755 char *kldname, *modname; 756 linker_file_t lf; 757 int error = 0; 758 759 uap->sysmsg_result = -1; 760 761 if (securelevel > 0 || kernel_mem_readonly) /* redundant, but that's OK */ 762 return EPERM; 763 764 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0) 765 return error; 766 767 file = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); 768 if ((error = copyinstr(uap->file, file, MAXPATHLEN, NULL)) != 0) 769 goto out; 770 771 /* 772 * If file does not contain a qualified name or any dot in it 773 * (kldname.ko, or kldname.ver.ko) treat it as an interface 774 * name. 775 */ 776 if (index(file, '/') || index(file, '.')) { 777 kldname = file; 778 modname = NULL; 779 } else { 780 kldname = NULL; 781 modname = file; 782 } 783 784 get_mplock(); 785 error = linker_load_module(kldname, modname, NULL, NULL, &lf); 786 rel_mplock(); 787 if (error) 788 goto out; 789 790 lf->userrefs++; 791 uap->sysmsg_result = lf->id; 792 793 out: 794 if (file) 795 kfree(file, M_TEMP); 796 return error; 797 } 798 799 /* 800 * MPALMOSTSAFE 801 */ 802 int 803 sys_kldunload(struct kldunload_args *uap) 804 { 805 struct thread *td = curthread; 806 linker_file_t lf; 807 int error = 0; 808 809 if (securelevel > 0 || kernel_mem_readonly) /* redundant, but that's OK */ 810 return EPERM; 811 812 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0) 813 return error; 814 815 get_mplock(); 816 lf = linker_find_file_by_id(uap->fileid); 817 if (lf) { 818 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 819 if (lf->userrefs == 0) { 820 kprintf("linkerunload: attempt to unload file that was loaded by the kernel\n"); 821 error = EBUSY; 822 goto out; 823 } 824 lf->userrefs--; 825 error = linker_file_unload(lf); 826 if (error) 827 lf->userrefs++; 828 } else { 829 error = ENOENT; 830 } 831 out: 832 rel_mplock(); 833 return error; 834 } 835 836 /* 837 * MPALMOSTSAFE 838 */ 839 int 840 sys_kldfind(struct kldfind_args *uap) 841 { 842 char *filename = NULL, *modulename; 843 linker_file_t lf; 844 int error; 845 846 uap->sysmsg_result = -1; 847 848 filename = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); 849 if ((error = copyinstr(uap->file, filename, MAXPATHLEN, NULL)) != 0) 850 goto out; 851 852 modulename = rindex(filename, '/'); 853 if (modulename == NULL) 854 modulename = filename; 855 856 get_mplock(); 857 lf = linker_find_file_by_name(modulename); 858 if (lf) 859 uap->sysmsg_result = lf->id; 860 else 861 error = ENOENT; 862 rel_mplock(); 863 864 out: 865 if (filename) 866 kfree(filename, M_TEMP); 867 return error; 868 } 869 870 /* 871 * MPALMOSTSAFE 872 */ 873 int 874 sys_kldnext(struct kldnext_args *uap) 875 { 876 linker_file_t lf; 877 int error = 0; 878 879 get_mplock(); 880 if (uap->fileid == 0) { 881 lf = TAILQ_FIRST(&linker_files); 882 } else { 883 lf = linker_find_file_by_id(uap->fileid); 884 if (lf == NULL) { 885 error = ENOENT; 886 goto out; 887 } 888 lf = TAILQ_NEXT(lf, link); 889 } 890 891 /* Skip partially loaded files. */ 892 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED)) { 893 lf = TAILQ_NEXT(lf, link); 894 } 895 896 if (lf) 897 uap->sysmsg_result = lf->id; 898 else 899 uap->sysmsg_result = 0; 900 901 out: 902 rel_mplock(); 903 return error; 904 } 905 906 /* 907 * MPALMOSTSAFE 908 */ 909 int 910 sys_kldstat(struct kldstat_args *uap) 911 { 912 linker_file_t lf; 913 int error = 0; 914 int version; 915 struct kld_file_stat* stat; 916 int namelen; 917 918 get_mplock(); 919 lf = linker_find_file_by_id(uap->fileid); 920 if (!lf) { 921 error = ENOENT; 922 goto out; 923 } 924 925 stat = uap->stat; 926 927 /* 928 * Check the version of the user's structure. 929 */ 930 if ((error = copyin(&stat->version, &version, sizeof(version))) != 0) 931 goto out; 932 if (version != sizeof(struct kld_file_stat)) { 933 error = EINVAL; 934 goto out; 935 } 936 937 namelen = strlen(lf->filename) + 1; 938 if (namelen > MAXPATHLEN) 939 namelen = MAXPATHLEN; 940 if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0) 941 goto out; 942 if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0) 943 goto out; 944 if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0) 945 goto out; 946 if ((error = copyout(&lf->address, &stat->address, sizeof(caddr_t))) != 0) 947 goto out; 948 if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0) 949 goto out; 950 951 uap->sysmsg_result = 0; 952 953 out: 954 rel_mplock(); 955 return error; 956 } 957 958 /* 959 * MPALMOSTSAFE 960 */ 961 int 962 sys_kldfirstmod(struct kldfirstmod_args *uap) 963 { 964 linker_file_t lf; 965 int error = 0; 966 967 get_mplock(); 968 lf = linker_find_file_by_id(uap->fileid); 969 if (lf) { 970 if (TAILQ_FIRST(&lf->modules)) 971 uap->sysmsg_result = module_getid(TAILQ_FIRST(&lf->modules)); 972 else 973 uap->sysmsg_result = 0; 974 } else { 975 error = ENOENT; 976 } 977 rel_mplock(); 978 979 return error; 980 } 981 982 /* 983 * MPALMOSTSAFE 984 */ 985 int 986 sys_kldsym(struct kldsym_args *uap) 987 { 988 char *symstr = NULL; 989 c_linker_sym_t sym; 990 linker_symval_t symval; 991 linker_file_t lf; 992 struct kld_sym_lookup lookup; 993 int error = 0; 994 995 get_mplock(); 996 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0) 997 goto out; 998 if (lookup.version != sizeof(lookup) || uap->cmd != KLDSYM_LOOKUP) { 999 error = EINVAL; 1000 goto out; 1001 } 1002 1003 symstr = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1004 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 1005 goto out; 1006 1007 if (uap->fileid != 0) { 1008 lf = linker_find_file_by_id(uap->fileid); 1009 if (lf == NULL) { 1010 error = ENOENT; 1011 goto out; 1012 } 1013 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 && 1014 lf->ops->symbol_values(lf, sym, &symval) == 0) { 1015 lookup.symvalue = (uintptr_t)symval.value; 1016 lookup.symsize = symval.size; 1017 error = copyout(&lookup, uap->data, sizeof(lookup)); 1018 } else 1019 error = ENOENT; 1020 } else { 1021 TAILQ_FOREACH(lf, &linker_files, link) { 1022 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 && 1023 lf->ops->symbol_values(lf, sym, &symval) == 0) { 1024 lookup.symvalue = (uintptr_t)symval.value; 1025 lookup.symsize = symval.size; 1026 error = copyout(&lookup, uap->data, sizeof(lookup)); 1027 break; 1028 } 1029 } 1030 if (!lf) 1031 error = ENOENT; 1032 } 1033 out: 1034 rel_mplock(); 1035 if (symstr) 1036 kfree(symstr, M_TEMP); 1037 return error; 1038 } 1039 1040 /* 1041 * Preloaded module support 1042 */ 1043 1044 static modlist_t 1045 modlist_lookup(const char *name, int ver) 1046 { 1047 modlist_t mod; 1048 1049 TAILQ_FOREACH(mod, &found_modules, link) { 1050 if (strcmp(mod->name, name) == 0 && (ver == 0 || mod->version == ver)) 1051 return (mod); 1052 } 1053 return (NULL); 1054 } 1055 1056 static modlist_t 1057 modlist_lookup2(const char *name, struct mod_depend *verinfo) 1058 { 1059 modlist_t mod, bestmod; 1060 int ver; 1061 1062 if (verinfo == NULL) 1063 return (modlist_lookup(name, 0)); 1064 bestmod = NULL; 1065 TAILQ_FOREACH(mod, &found_modules, link) { 1066 if (strcmp(mod->name, name) != 0) 1067 continue; 1068 ver = mod->version; 1069 if (ver == verinfo->md_ver_preferred) 1070 return (mod); 1071 if (ver >= verinfo->md_ver_minimum && 1072 ver <= verinfo->md_ver_maximum && 1073 (bestmod == NULL || ver > bestmod->version)) 1074 bestmod = mod; 1075 } 1076 return (bestmod); 1077 } 1078 1079 int 1080 linker_reference_module(const char *modname, struct mod_depend *verinfo, 1081 linker_file_t *result) 1082 { 1083 modlist_t mod; 1084 int error; 1085 1086 lockmgr(&lock, LK_SHARED); 1087 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) { 1088 *result = mod->container; 1089 (*result)->refs++; 1090 lockmgr(&lock, LK_RELEASE); 1091 return (0); 1092 } 1093 1094 lockmgr(&lock, LK_RELEASE); 1095 get_mplock(); 1096 error = linker_load_module(NULL, modname, NULL, verinfo, result); 1097 rel_mplock(); 1098 return (error); 1099 } 1100 1101 int 1102 linker_release_module(const char *modname, struct mod_depend *verinfo, 1103 linker_file_t lf) 1104 { 1105 modlist_t mod; 1106 int error; 1107 1108 lockmgr(&lock, LK_SHARED); 1109 if (lf == NULL) { 1110 KASSERT(modname != NULL, 1111 ("linker_release_module: no file or name")); 1112 mod = modlist_lookup2(modname, verinfo); 1113 if (mod == NULL) { 1114 lockmgr(&lock, LK_RELEASE); 1115 return (ESRCH); 1116 } 1117 lf = mod->container; 1118 } else 1119 KASSERT(modname == NULL && verinfo == NULL, 1120 ("linker_release_module: both file and name")); 1121 lockmgr(&lock, LK_RELEASE); 1122 get_mplock(); 1123 error = linker_file_unload(lf); 1124 rel_mplock(); 1125 return (error); 1126 } 1127 1128 static modlist_t 1129 modlist_newmodule(const char *modname, int version, linker_file_t container) 1130 { 1131 modlist_t mod; 1132 1133 mod = kmalloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO); 1134 if (mod == NULL) 1135 panic("no memory for module list"); 1136 mod->container = container; 1137 mod->name = modname; 1138 mod->version = version; 1139 TAILQ_INSERT_TAIL(&found_modules, mod, link); 1140 return (mod); 1141 } 1142 1143 static void 1144 linker_addmodules(linker_file_t lf, struct mod_metadata **start, 1145 struct mod_metadata **stop, int preload) 1146 { 1147 struct mod_metadata *mp, **mdp; 1148 const char *modname; 1149 int ver; 1150 1151 for (mdp = start; mdp < stop; mdp++) { 1152 mp = *mdp; 1153 if (mp->md_type != MDT_VERSION) 1154 continue; 1155 modname = mp->md_cval; 1156 ver = ((struct mod_version *)mp->md_data)->mv_version; 1157 if (modlist_lookup(modname, ver) != NULL) { 1158 kprintf("module %s already present!\n", modname); 1159 /* XXX what can we do? this is a build error. :-( */ 1160 continue; 1161 } 1162 modlist_newmodule(modname, ver, lf); 1163 } 1164 } 1165 1166 static void 1167 linker_preload(void* arg) 1168 { 1169 caddr_t modptr; 1170 const char *modname, *nmodname; 1171 char *modtype; 1172 linker_file_t lf, nlf; 1173 linker_class_t lc; 1174 int error; 1175 linker_file_list_t loaded_files; 1176 linker_file_list_t depended_files; 1177 struct mod_metadata *mp, *nmp; 1178 struct mod_metadata **start, **stop, **mdp, **nmdp; 1179 struct mod_depend *verinfo; 1180 int nver; 1181 int resolves; 1182 modlist_t mod; 1183 struct sysinit **si_start, **si_stop; 1184 1185 TAILQ_INIT(&loaded_files); 1186 TAILQ_INIT(&depended_files); 1187 TAILQ_INIT(&found_modules); 1188 1189 modptr = NULL; 1190 while ((modptr = preload_search_next_name(modptr)) != NULL) { 1191 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 1192 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 1193 if (modname == NULL) { 1194 kprintf("Preloaded module at %p does not have a name!\n", modptr); 1195 continue; 1196 } 1197 if (modtype == NULL) { 1198 kprintf("Preloaded module at %p does not have a type!\n", modptr); 1199 continue; 1200 } 1201 1202 if (bootverbose) 1203 kprintf("Preloaded %s \"%s\" at %p.\n", modtype, modname, modptr); 1204 lf = NULL; 1205 TAILQ_FOREACH(lc, &classes, link) { 1206 error = lc->ops->preload_file(modname, &lf); 1207 if (!error) 1208 break; 1209 lf = NULL; 1210 } 1211 if (lf) 1212 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 1213 } 1214 1215 /* 1216 * First get a list of stuff in the kernel. 1217 */ 1218 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, 1219 &stop, NULL) == 0) 1220 linker_addmodules(linker_kernel_file, start, stop, 1); 1221 1222 /* 1223 * This is a once-off kinky bubble sort to resolve relocation 1224 * dependency requirements. 1225 */ 1226 restart: 1227 TAILQ_FOREACH(lf, &loaded_files, loaded) { 1228 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, NULL); 1229 /* 1230 * First, look to see if we would successfully link with this 1231 * stuff. 1232 */ 1233 resolves = 1; /* unless we know otherwise */ 1234 if (!error) { 1235 for (mdp = start; mdp < stop; mdp++) { 1236 mp = *mdp; 1237 if (mp->md_type != MDT_DEPEND) 1238 continue; 1239 modname = mp->md_cval; 1240 verinfo = mp->md_data; 1241 for (nmdp = start; nmdp < stop; nmdp++) { 1242 nmp = *nmdp; 1243 if (nmp->md_type != MDT_VERSION) 1244 continue; 1245 nmodname = nmp->md_cval; 1246 if (strcmp(modname, nmodname) == 0) 1247 break; 1248 } 1249 if (nmdp < stop)/* it's a self reference */ 1250 continue; 1251 1252 /* 1253 * ok, the module isn't here yet, we 1254 * are not finished 1255 */ 1256 if (modlist_lookup2(modname, verinfo) == NULL) 1257 resolves = 0; 1258 } 1259 } 1260 /* 1261 * OK, if we found our modules, we can link. So, "provide" 1262 * the modules inside and add it to the end of the link order 1263 * list. 1264 */ 1265 if (resolves) { 1266 if (!error) { 1267 for (mdp = start; mdp < stop; mdp++) { 1268 mp = *mdp; 1269 if (mp->md_type != MDT_VERSION) 1270 continue; 1271 modname = mp->md_cval; 1272 nver = ((struct mod_version *)mp->md_data)->mv_version; 1273 if (modlist_lookup(modname, nver) != NULL) { 1274 kprintf("module %s already present!\n", modname); 1275 TAILQ_REMOVE(&loaded_files, lf, loaded); 1276 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ ); 1277 /* we changed tailq next ptr */ 1278 goto restart; 1279 } 1280 modlist_newmodule(modname, nver, lf); 1281 } 1282 } 1283 TAILQ_REMOVE(&loaded_files, lf, loaded); 1284 TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 1285 /* 1286 * Since we provided modules, we need to restart the 1287 * sort so that the previous files that depend on us 1288 * have a chance. Also, we've busted the tailq next 1289 * pointer with the REMOVE. 1290 */ 1291 goto restart; 1292 } 1293 } 1294 1295 /* 1296 * At this point, we check to see what could not be resolved.. 1297 */ 1298 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) { 1299 TAILQ_REMOVE(&loaded_files, lf, loaded); 1300 kprintf("KLD file %s is missing dependencies\n", lf->filename); 1301 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ ); 1302 } 1303 1304 /* 1305 * We made it. Finish off the linking in the order we determined. 1306 */ 1307 TAILQ_FOREACH_MUTABLE(lf, &depended_files, loaded, nlf) { 1308 if (linker_kernel_file) { 1309 linker_kernel_file->refs++; 1310 linker_file_add_dependancy(lf, linker_kernel_file); 1311 } 1312 lf->userrefs++; 1313 1314 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, NULL); 1315 if (!error) { 1316 for (mdp = start; mdp < stop; mdp++) { 1317 mp = *mdp; 1318 if (mp->md_type != MDT_DEPEND) 1319 continue; 1320 modname = mp->md_cval; 1321 verinfo = mp->md_data; 1322 mod = modlist_lookup2(modname, verinfo); 1323 /* Don't count self-dependencies */ 1324 if (lf == mod->container) 1325 continue; 1326 mod->container->refs++; 1327 linker_file_add_dependancy(lf, mod->container); 1328 } 1329 } 1330 /* 1331 * Now do relocation etc using the symbol search paths 1332 * established by the dependencies 1333 */ 1334 error = lf->ops->preload_finish(lf); 1335 if (error) { 1336 TAILQ_REMOVE(&depended_files, lf, loaded); 1337 kprintf("KLD file %s - could not finalize loading\n", 1338 lf->filename); 1339 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */); 1340 continue; 1341 } 1342 linker_file_register_modules(lf); 1343 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, &si_stop, NULL) == 0) 1344 sysinit_add(si_start, si_stop); 1345 linker_file_register_sysctls(lf); 1346 lf->flags |= LINKER_FILE_LINKED; 1347 } 1348 /* woohoo! we made it! */ 1349 } 1350 1351 SYSINIT(preload, SI_BOOT2_KLD, SI_ORDER_MIDDLE, linker_preload, 0); 1352 1353 /* 1354 * Search for a not-loaded module by name. 1355 * 1356 * Modules may be found in the following locations: 1357 * 1358 * - preloaded (result is just the module name) 1359 * - on disk (result is full path to module) 1360 * 1361 * If the module name is qualified in any way (contains path, etc.) 1362 * the we simply return a copy of it. 1363 * 1364 * The search path can be manipulated via sysctl. Note that we use the ';' 1365 * character as a separator to be consistent with the bootloader. 1366 */ 1367 1368 static char linker_path[MAXPATHLEN] = "/boot;/boot/modules;/;/modules"; 1369 1370 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path, 1371 sizeof(linker_path), "module load search path"); 1372 TUNABLE_STR("module_path", linker_path, sizeof(linker_path)); 1373 1374 char * 1375 linker_search_path(const char *name) 1376 { 1377 struct nlookupdata nd; 1378 char *cp, *ep, *result; 1379 size_t name_len, prefix_len; 1380 size_t result_len; 1381 int sep; 1382 int error; 1383 enum vtype type; 1384 const char *exts[] = { "", ".ko", NULL }; 1385 const char **ext; 1386 1387 /* qualified at all? */ 1388 if (index(name, '/')) 1389 return(linker_strdup(name)); 1390 1391 /* traverse the linker path */ 1392 cp = linker_path; 1393 name_len = strlen(name); 1394 for (;;) { 1395 1396 /* find the end of this component */ 1397 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++) 1398 ; 1399 prefix_len = ep - cp; 1400 /* if this component doesn't end with a slash, add one */ 1401 if (ep == cp || *(ep - 1) != '/') 1402 sep = 1; 1403 else 1404 sep = 0; 1405 1406 /* 1407 * +2+3 : possible separator, plus terminator + possible extension. 1408 */ 1409 result = kmalloc(prefix_len + name_len + 2+3, M_LINKER, M_WAITOK); 1410 1411 strncpy(result, cp, prefix_len); 1412 if (sep) 1413 result[prefix_len++] = '/'; 1414 strcpy(result + prefix_len, name); 1415 1416 result_len = strlen(result); 1417 for (ext = exts; *ext != NULL; ext++) { 1418 strcpy(result + result_len, *ext); 1419 1420 /* 1421 * Attempt to open the file, and return the path if we succeed and it's 1422 * a regular file. 1423 */ 1424 error = nlookup_init(&nd, result, UIO_SYSSPACE, NLC_FOLLOW|NLC_LOCKVP); 1425 if (error == 0) 1426 error = vn_open(&nd, NULL, FREAD, 0); 1427 if (error == 0) { 1428 type = nd.nl_open_vp->v_type; 1429 if (type == VREG) { 1430 nlookup_done(&nd); 1431 return (result); 1432 } 1433 } 1434 nlookup_done(&nd); 1435 } 1436 1437 kfree(result, M_LINKER); 1438 1439 if (*ep == 0) 1440 break; 1441 cp = ep + 1; 1442 } 1443 return(NULL); 1444 } 1445 1446 /* 1447 * Find a file which contains given module and load it, if "parent" is not 1448 * NULL, register a reference to it. 1449 */ 1450 static int 1451 linker_load_module(const char *kldname, const char *modname, 1452 struct linker_file *parent, struct mod_depend *verinfo, 1453 struct linker_file **lfpp) 1454 { 1455 linker_file_t lfdep; 1456 const char *filename; 1457 char *pathname; 1458 int error; 1459 1460 if (modname == NULL) { 1461 /* 1462 * We have to load KLD 1463 */ 1464 KASSERT(verinfo == NULL, ("linker_load_module: verinfo is not NULL")); 1465 pathname = linker_search_path(kldname); 1466 } else { 1467 if (modlist_lookup2(modname, verinfo) != NULL) 1468 return (EEXIST); 1469 if (kldname != NULL) 1470 { 1471 pathname = linker_strdup(kldname); 1472 } 1473 else if (rootvnode == NULL) 1474 pathname = NULL; 1475 else 1476 { 1477 pathname = linker_search_path(modname); 1478 } 1479 #if 0 1480 /* 1481 * Need to find a KLD with required module 1482 */ 1483 pathname = linker_search_module(modname, 1484 strlen(modname), verinfo); 1485 #endif 1486 } 1487 if (pathname == NULL) 1488 return (ENOENT); 1489 1490 /* 1491 * Can't load more than one file with the same basename XXX: 1492 * Actually it should be possible to have multiple KLDs with 1493 * the same basename but different path because they can 1494 * provide different versions of the same modules. 1495 */ 1496 filename = rindex(pathname, '/'); 1497 if (filename == NULL) 1498 filename = filename; 1499 else 1500 filename++; 1501 if (linker_find_file_by_name(filename)) 1502 error = EEXIST; 1503 else 1504 do { 1505 error = linker_load_file(pathname, &lfdep); 1506 if (error) 1507 break; 1508 if (modname && verinfo && modlist_lookup2(modname, verinfo) == NULL) { 1509 linker_file_unload(lfdep /* , LINKER_UNLOAD_FORCE */ ); 1510 error = ENOENT; 1511 break; 1512 } 1513 if (parent) { 1514 linker_file_add_dependancy(parent, lfdep); 1515 } 1516 if (lfpp) 1517 *lfpp = lfdep; 1518 } while (0); 1519 kfree(pathname, M_LINKER); 1520 return (error); 1521 } 1522 1523 /* 1524 * This routine is responsible for finding dependencies of userland initiated 1525 * kldload(2)'s of files. 1526 */ 1527 int 1528 linker_load_dependencies(linker_file_t lf) 1529 { 1530 linker_file_t lfdep; 1531 struct mod_metadata **start, **stop, **mdp, **nmdp; 1532 struct mod_metadata *mp, *nmp; 1533 struct mod_depend *verinfo; 1534 modlist_t mod; 1535 const char *modname, *nmodname; 1536 int ver, error = 0, count; 1537 1538 /* 1539 * All files are dependant on /kernel. 1540 */ 1541 if (linker_kernel_file) { 1542 linker_kernel_file->refs++; 1543 linker_file_add_dependancy(lf, linker_kernel_file); 1544 } 1545 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, &count) != 0) 1546 return (0); 1547 for (mdp = start; mdp < stop; mdp++) { 1548 mp = *mdp; 1549 if (mp->md_type != MDT_VERSION) 1550 continue; 1551 modname = mp->md_cval; 1552 ver = ((struct mod_version *)mp->md_data)->mv_version; 1553 mod = modlist_lookup(modname, ver); 1554 if (mod != NULL) { 1555 kprintf("interface %s.%d already present in the KLD '%s'!\n", 1556 modname, ver, mod->container->filename); 1557 return (EEXIST); 1558 } 1559 } 1560 1561 for (mdp = start; mdp < stop; mdp++) { 1562 mp = *mdp; 1563 if (mp->md_type != MDT_DEPEND) 1564 continue; 1565 modname = mp->md_cval; 1566 verinfo = mp->md_data; 1567 nmodname = NULL; 1568 for (nmdp = start; nmdp < stop; nmdp++) { 1569 nmp = *nmdp; 1570 if (nmp->md_type != MDT_VERSION) 1571 continue; 1572 nmodname = nmp->md_cval; 1573 if (strcmp(modname, nmodname) == 0) 1574 break; 1575 } 1576 if (nmdp < stop) /* early exit, it's a self reference */ 1577 continue; 1578 mod = modlist_lookup2(modname, verinfo); 1579 if (mod) { /* woohoo, it's loaded already */ 1580 lfdep = mod->container; 1581 lfdep->refs++; 1582 linker_file_add_dependancy(lf, lfdep); 1583 continue; 1584 } 1585 error = linker_load_module(NULL, modname, lf, verinfo, NULL); 1586 if (error) { 1587 kprintf("KLD %s: depends on %s - not available or version mismatch\n", 1588 lf->filename, modname); 1589 break; 1590 } 1591 } 1592 1593 if (error) 1594 return (error); 1595 linker_addmodules(lf, start, stop, 0); 1596 return (error); 1597 } 1598