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 */ 28 29 #include "opt_ddb.h" 30 31 #include <sys/param.h> 32 #include <sys/kernel.h> 33 #include <sys/systm.h> 34 #include <sys/malloc.h> 35 #include <sys/sysmsg.h> 36 #include <sys/sysent.h> 37 #include <sys/proc.h> 38 #include <sys/priv.h> 39 #include <sys/lock.h> 40 #include <sys/module.h> 41 #include <sys/queue.h> 42 #include <sys/linker.h> 43 #include <sys/fcntl.h> 44 #include <sys/libkern.h> 45 #include <sys/nlookup.h> 46 #include <sys/vnode.h> 47 #include <sys/sysctl.h> 48 49 #include <vm/vm_zone.h> 50 51 #ifdef _KERNEL_VIRTUAL 52 #include <dlfcn.h> 53 #endif 54 55 #ifdef KLD_DEBUG 56 int kld_debug = 1; 57 #endif 58 59 /* Metadata from the static kernel */ 60 SET_DECLARE(modmetadata_set, struct mod_metadata); 61 MALLOC_DEFINE(M_LINKER, "kld", "kernel linker"); 62 63 linker_file_t linker_current_file; 64 linker_file_t linker_kernel_file; 65 66 static struct lock llf_lock; /* lock for the file list */ 67 static struct lock kld_lock; 68 static linker_class_list_t classes; 69 static linker_file_list_t linker_files; 70 static int next_file_id = 1; 71 72 /* XXX wrong name; we're looking at version provision tags here, not modules */ 73 typedef TAILQ_HEAD(, modlist) modlisthead_t; 74 struct modlist { 75 TAILQ_ENTRY(modlist) link; /* chain together all modules */ 76 linker_file_t container; 77 const char *name; 78 int version; 79 }; 80 typedef struct modlist *modlist_t; 81 static modlisthead_t found_modules; 82 83 84 static int linker_load_module(const char *kldname, const char *modname, 85 struct linker_file *parent, struct mod_depend *verinfo, 86 struct linker_file **lfpp); 87 88 static char * 89 linker_strdup(const char *str) 90 { 91 char *result; 92 93 result = kmalloc(strlen(str) + 1, M_LINKER, M_WAITOK); 94 strcpy(result, str); 95 return(result); 96 } 97 98 static void 99 linker_init(void* arg) 100 { 101 lockinit(&llf_lock, "klink", 0, 0); 102 lockinit(&kld_lock, "kldlk", 0, LK_CANRECURSE); 103 TAILQ_INIT(&classes); 104 TAILQ_INIT(&linker_files); 105 } 106 107 SYSINIT(linker, SI_BOOT2_KLD, SI_ORDER_FIRST, linker_init, 0); 108 109 int 110 linker_add_class(const char* desc, void* priv, 111 struct linker_class_ops* ops) 112 { 113 linker_class_t lc; 114 115 lc = kmalloc(sizeof(struct linker_class), M_LINKER, M_NOWAIT | M_ZERO); 116 if (!lc) 117 return ENOMEM; 118 119 lc->desc = desc; 120 lc->priv = priv; 121 lc->ops = ops; 122 TAILQ_INSERT_HEAD(&classes, lc, link); 123 124 return 0; 125 } 126 127 static void 128 linker_file_sysinit(linker_file_t lf) 129 { 130 struct sysinit** start, ** stop; 131 struct sysinit** sipp; 132 struct sysinit** xipp; 133 struct sysinit* save; 134 135 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", 136 lf->filename)); 137 138 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0) 139 return; 140 141 /* 142 * Perform a bubble sort of the system initialization objects by 143 * their subsystem (primary key) and order (secondary key). 144 * 145 * Since some things care about execution order, this is the 146 * operation which ensures continued function. 147 */ 148 for (sipp = start; sipp < stop; sipp++) { 149 for (xipp = sipp + 1; xipp < stop; xipp++) { 150 if ((*sipp)->subsystem < (*xipp)->subsystem || 151 ((*sipp)->subsystem == (*xipp)->subsystem && 152 (*sipp)->order <= (*xipp)->order)) 153 continue; /* skip*/ 154 save = *sipp; 155 *sipp = *xipp; 156 *xipp = save; 157 } 158 } 159 160 161 /* 162 * Traverse the (now) ordered list of system initialization tasks. 163 * Perform each task, and continue on to the next task. 164 */ 165 for (sipp = start; sipp < stop; sipp++) { 166 if ((*sipp)->subsystem == SI_SPECIAL_DUMMY) 167 continue; /* skip dummy task(s)*/ 168 169 /* Call function */ 170 (*((*sipp)->func))((*sipp)->udata); 171 } 172 } 173 174 static void 175 linker_file_sysuninit(linker_file_t lf) 176 { 177 struct sysinit** start, ** stop; 178 struct sysinit** sipp; 179 struct sysinit** xipp; 180 struct sysinit* save; 181 182 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 183 lf->filename)); 184 185 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, NULL) != 0) 186 return; 187 188 /* 189 * Perform a reverse bubble sort of the system initialization objects 190 * by their subsystem (primary key) and order (secondary key). 191 * 192 * Since some things care about execution order, this is the 193 * operation which ensures continued function. 194 */ 195 for (sipp = start; sipp < stop; sipp++) { 196 for (xipp = sipp + 1; xipp < stop; xipp++) { 197 if ((*sipp)->subsystem > (*xipp)->subsystem || 198 ((*sipp)->subsystem == (*xipp)->subsystem && 199 (*sipp)->order >= (*xipp)->order)) 200 continue; /* skip*/ 201 save = *sipp; 202 *sipp = *xipp; 203 *xipp = save; 204 } 205 } 206 207 208 /* 209 * Traverse the (now) ordered list of system initialization tasks. 210 * Perform each task, and continue on to the next task. 211 */ 212 for (sipp = start; sipp < stop; sipp++) { 213 if ((*sipp)->subsystem == SI_SPECIAL_DUMMY) 214 continue; /* skip dummy task(s)*/ 215 216 /* Call function */ 217 (*((*sipp)->func))((*sipp)->udata); 218 } 219 } 220 221 static void 222 linker_file_register_sysctls(linker_file_t lf) 223 { 224 struct sysctl_oid **start, **stop, **oidp; 225 226 KLD_DPF(FILE, ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 227 lf->filename)); 228 229 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 230 return; 231 for (oidp = start; oidp < stop; oidp++) 232 sysctl_register_oid(*oidp); 233 } 234 235 static void 236 linker_file_unregister_sysctls(linker_file_t lf) 237 { 238 struct sysctl_oid **start, **stop, **oidp; 239 240 KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs for %s\n", 241 lf->filename)); 242 243 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 244 return; 245 for (oidp = start; oidp < stop; oidp++) 246 sysctl_unregister_oid(*oidp); 247 } 248 249 static int 250 linker_file_register_modules(linker_file_t lf) 251 { 252 struct mod_metadata **start, **stop, **mdp; 253 const moduledata_t *moddata; 254 int first_error, error; 255 256 KLD_DPF(FILE, ("linker_file_register_modules: registering modules in %s\n", 257 lf->filename)); 258 259 if (linker_file_lookup_set(lf, "modmetadata_set", &start, &stop, NULL) != 0) { 260 /* 261 * This fallback should be unnecessary, but if we get booted 262 * from boot2 instead of loader and we are missing our 263 * metadata then we have to try the best we can. 264 */ 265 if (lf == linker_kernel_file) { 266 start = SET_BEGIN(modmetadata_set); 267 stop = SET_LIMIT(modmetadata_set); 268 } else 269 return (0); 270 } 271 first_error = 0; 272 for (mdp = start; mdp < stop; mdp++) { 273 if ((*mdp)->md_type != MDT_MODULE) 274 continue; 275 moddata = (*mdp)->md_data; 276 KLD_DPF(FILE, ("Registering module %s in %s\n", moddata->name, lf->filename)); 277 error = module_register(moddata, lf); 278 if (error) { 279 kprintf("Module %s failed to register: %d\n", moddata->name, error); 280 if (first_error == 0) 281 first_error = error; 282 } 283 } 284 return (first_error); 285 } 286 287 static void 288 linker_init_kernel_modules(void) 289 { 290 291 linker_file_register_modules(linker_kernel_file); 292 } 293 294 SYSINIT(linker_kernel, SI_BOOT2_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 0); 295 296 int 297 linker_load_file(const char *filename, linker_file_t *result) 298 { 299 linker_class_t lc; 300 linker_file_t lf; 301 int foundfile, error = 0; 302 303 /* Refuse to load modules if securelevel raised */ 304 if (securelevel > 0 || kernel_mem_readonly) 305 return EPERM; 306 307 lf = linker_find_file_by_name(filename); 308 if (lf) { 309 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded, incrementing refs\n", filename)); 310 *result = lf; 311 lf->refs++; 312 goto out; 313 } 314 315 lf = NULL; 316 foundfile = 0; 317 TAILQ_FOREACH(lc, &classes, link) { 318 KLD_DPF(FILE, ("linker_load_file: trying to load %s as %s\n", 319 filename, lc->desc)); 320 321 error = lc->ops->load_file(filename, &lf); 322 /* 323 * If we got something other than ENOENT, then it exists but we cannot 324 * load it for some other reason. 325 */ 326 if (error != ENOENT) 327 foundfile = 1; 328 if (lf) { 329 error = linker_file_register_modules(lf); 330 if (error == EEXIST) { 331 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */); 332 return (error); 333 } 334 linker_file_register_sysctls(lf); 335 linker_file_sysinit(lf); 336 lf->flags |= LINKER_FILE_LINKED; 337 *result = lf; 338 return (0); 339 } 340 } 341 /* 342 * Less than ideal, but tells the user whether it failed to load or 343 * the module was not found. 344 */ 345 if (foundfile) { 346 /* 347 * If the file type has not been recognized by the last try 348 * printout a message before to fail. 349 */ 350 if (error == ENOSYS) 351 kprintf("linker_load_file: Unsupported file type\n"); 352 353 /* 354 * Format not recognized or otherwise unloadable. 355 * When loading a module that is statically built into 356 * the kernel EEXIST percolates back up as the return 357 * value. Preserve this so that apps can recognize this 358 * special case. 359 */ 360 if (error != EEXIST) 361 error = ENOEXEC; 362 } else { 363 error = ENOENT; /* Nothing found */ 364 } 365 366 out: 367 return error; 368 } 369 370 371 linker_file_t 372 linker_find_file_by_name(const char* filename) 373 { 374 linker_file_t lf = NULL; 375 char *koname; 376 int i; 377 378 for (i = strlen(filename); i > 0 && filename[i-1] != '/'; --i) 379 ; 380 filename += i; 381 382 koname = kmalloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 383 ksprintf(koname, "%s.ko", filename); 384 385 lockmgr(&llf_lock, LK_SHARED); 386 TAILQ_FOREACH(lf, &linker_files, link) { 387 if (!strcmp(lf->filename, koname)) 388 break; 389 if (!strcmp(lf->filename, filename)) 390 break; 391 } 392 lockmgr(&llf_lock, LK_RELEASE); 393 394 if (koname) 395 kfree(koname, M_LINKER); 396 return lf; 397 } 398 399 linker_file_t 400 linker_find_file_by_id(int fileid) 401 { 402 linker_file_t lf = NULL; 403 404 lockmgr(&llf_lock, LK_SHARED); 405 TAILQ_FOREACH(lf, &linker_files, link) { 406 if (lf->id == fileid) 407 break; 408 } 409 lockmgr(&llf_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(&llf_lock, LK_SHARED); 421 TAILQ_FOREACH(lf, &linker_files, link) { 422 retval = predicate(lf, context); 423 if (retval != 0) 424 break; 425 } 426 lockmgr(&llf_lock, LK_RELEASE); 427 428 return (retval); 429 } 430 431 linker_file_t 432 linker_make_file(const char* pathname, void* priv, struct linker_file_ops* ops) 433 { 434 linker_file_t lf = NULL; 435 const char *filename; 436 437 filename = rindex(pathname, '/'); 438 if (filename && filename[1]) 439 filename++; 440 else 441 filename = pathname; 442 443 KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename)); 444 lockmgr(&llf_lock, LK_EXCLUSIVE); 445 lf = kmalloc(sizeof(struct linker_file), M_LINKER, M_WAITOK | M_ZERO); 446 lf->refs = 1; 447 lf->userrefs = 0; 448 lf->flags = 0; 449 lf->filename = linker_strdup(filename); 450 lf->id = next_file_id++; 451 lf->ndeps = 0; 452 lf->deps = NULL; 453 STAILQ_INIT(&lf->common); 454 TAILQ_INIT(&lf->modules); 455 456 lf->priv = priv; 457 lf->ops = ops; 458 TAILQ_INSERT_TAIL(&linker_files, lf, link); 459 460 lockmgr(&llf_lock, LK_RELEASE); 461 462 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(&llf_lock, LK_EXCLUSIVE); 481 482 /* Easy case of just dropping a reference. */ 483 if (file->refs > 1) { 484 file->refs--; 485 lockmgr(&llf_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(&llf_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(&llf_lock, LK_RELEASE); 524 linker_file_sysuninit(file); 525 linker_file_unregister_sysctls(file); 526 lockmgr(&llf_lock, LK_EXCLUSIVE); 527 } 528 529 TAILQ_REMOVE(&linker_files, file, link); 530 531 if (file->deps) { 532 lockmgr(&llf_lock, LK_RELEASE); 533 for (i = 0; i < file->ndeps; i++) 534 linker_file_unload(file->deps[i]); 535 lockmgr(&llf_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(&llf_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 == NULL && 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 = NULL; 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 != NULL && 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 = NULL; 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 sysmsg *sysmsg, const 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 sysmsg->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 lockmgr(&kld_lock, LK_EXCLUSIVE); 801 error = linker_load_module(kldname, modname, NULL, NULL, &lf); 802 lockmgr(&kld_lock, LK_RELEASE); 803 if (error) 804 goto out; 805 806 lf->userrefs++; 807 sysmsg->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 sysmsg *sysmsg, const 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 lockmgr(&kld_lock, LK_EXCLUSIVE); 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 lockmgr(&kld_lock, LK_RELEASE); 849 850 return error; 851 } 852 853 /* 854 * MPALMOSTSAFE 855 */ 856 int 857 sys_kldfind(struct sysmsg *sysmsg, const struct kldfind_args *uap) 858 { 859 char *filename = NULL, *modulename; 860 linker_file_t lf; 861 int error; 862 863 sysmsg->sysmsg_result = -1; 864 865 filename = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); 866 if ((error = copyinstr(uap->file, filename, MAXPATHLEN, NULL)) != 0) 867 goto out; 868 869 modulename = rindex(filename, '/'); 870 if (modulename == NULL) 871 modulename = filename; 872 873 lockmgr(&kld_lock, LK_EXCLUSIVE); 874 lf = linker_find_file_by_name(modulename); 875 if (lf) 876 sysmsg->sysmsg_result = lf->id; 877 else 878 error = ENOENT; 879 lockmgr(&kld_lock, LK_RELEASE); 880 881 out: 882 if (filename) 883 kfree(filename, M_TEMP); 884 return error; 885 } 886 887 /* 888 * MPALMOSTSAFE 889 */ 890 int 891 sys_kldnext(struct sysmsg *sysmsg, const struct kldnext_args *uap) 892 { 893 linker_file_t lf; 894 int error = 0; 895 896 lockmgr(&kld_lock, LK_EXCLUSIVE); 897 if (uap->fileid == 0) { 898 lf = TAILQ_FIRST(&linker_files); 899 } else { 900 lf = linker_find_file_by_id(uap->fileid); 901 if (lf == NULL) { 902 error = ENOENT; 903 goto out; 904 } 905 lf = TAILQ_NEXT(lf, link); 906 } 907 908 /* Skip partially loaded files. */ 909 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED)) { 910 lf = TAILQ_NEXT(lf, link); 911 } 912 913 if (lf) 914 sysmsg->sysmsg_result = lf->id; 915 else 916 sysmsg->sysmsg_result = 0; 917 918 out: 919 lockmgr(&kld_lock, LK_RELEASE); 920 921 return error; 922 } 923 924 /* 925 * MPALMOSTSAFE 926 */ 927 int 928 sys_kldstat(struct sysmsg *sysmsg, const struct kldstat_args *uap) 929 { 930 linker_file_t lf; 931 int error = 0; 932 int version; 933 struct kld_file_stat* stat; 934 int namelen; 935 936 lockmgr(&kld_lock, LK_EXCLUSIVE); 937 lf = linker_find_file_by_id(uap->fileid); 938 if (!lf) { 939 error = ENOENT; 940 goto out; 941 } 942 943 stat = uap->stat; 944 945 /* 946 * Check the version of the user's structure. 947 */ 948 if ((error = copyin(&stat->version, &version, sizeof(version))) != 0) 949 goto out; 950 if (version != sizeof(struct kld_file_stat)) { 951 error = EINVAL; 952 goto out; 953 } 954 955 namelen = strlen(lf->filename) + 1; 956 if (namelen > MAXPATHLEN) 957 namelen = MAXPATHLEN; 958 if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0) 959 goto out; 960 if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0) 961 goto out; 962 if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0) 963 goto out; 964 if ((error = copyout(&lf->address, &stat->address, sizeof(caddr_t))) != 0) 965 goto out; 966 if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0) 967 goto out; 968 969 sysmsg->sysmsg_result = 0; 970 971 out: 972 lockmgr(&kld_lock, LK_RELEASE); 973 974 return error; 975 } 976 977 /* 978 * MPALMOSTSAFE 979 */ 980 int 981 sys_kldfirstmod(struct sysmsg *sysmsg, const struct kldfirstmod_args *uap) 982 { 983 linker_file_t lf; 984 int error = 0; 985 986 lockmgr(&kld_lock, LK_EXCLUSIVE); 987 lf = linker_find_file_by_id(uap->fileid); 988 if (lf) { 989 if (TAILQ_FIRST(&lf->modules)) 990 sysmsg->sysmsg_result = module_getid(TAILQ_FIRST(&lf->modules)); 991 else 992 sysmsg->sysmsg_result = 0; 993 } else { 994 error = ENOENT; 995 } 996 lockmgr(&kld_lock, LK_RELEASE); 997 998 return error; 999 } 1000 1001 /* 1002 * MPALMOSTSAFE 1003 */ 1004 int 1005 sys_kldsym(struct sysmsg *sysmsg, const struct kldsym_args *uap) 1006 { 1007 char *symstr = NULL; 1008 c_linker_sym_t sym; 1009 linker_symval_t symval; 1010 linker_file_t lf; 1011 struct kld_sym_lookup lookup; 1012 int error = 0; 1013 1014 lockmgr(&kld_lock, LK_EXCLUSIVE); 1015 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0) 1016 goto out; 1017 if (lookup.version != sizeof(lookup) || uap->cmd != KLDSYM_LOOKUP) { 1018 error = EINVAL; 1019 goto out; 1020 } 1021 1022 symstr = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1023 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 1024 goto out; 1025 1026 if (uap->fileid != 0) { 1027 lf = linker_find_file_by_id(uap->fileid); 1028 if (lf == NULL) { 1029 error = ENOENT; 1030 goto out; 1031 } 1032 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 && 1033 lf->ops->symbol_values(lf, sym, &symval) == 0) { 1034 lookup.symvalue = (uintptr_t)symval.value; 1035 lookup.symsize = symval.size; 1036 error = copyout(&lookup, uap->data, sizeof(lookup)); 1037 } else 1038 error = ENOENT; 1039 } else { 1040 TAILQ_FOREACH(lf, &linker_files, link) { 1041 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 && 1042 lf->ops->symbol_values(lf, sym, &symval) == 0) { 1043 lookup.symvalue = (uintptr_t)symval.value; 1044 lookup.symsize = symval.size; 1045 error = copyout(&lookup, uap->data, sizeof(lookup)); 1046 break; 1047 } 1048 } 1049 if (!lf) 1050 error = ENOENT; 1051 } 1052 out: 1053 lockmgr(&kld_lock, LK_RELEASE); 1054 if (symstr) 1055 kfree(symstr, M_TEMP); 1056 1057 return error; 1058 } 1059 1060 /* 1061 * Preloaded module support 1062 */ 1063 1064 static modlist_t 1065 modlist_lookup(const char *name, int ver) 1066 { 1067 modlist_t mod; 1068 1069 TAILQ_FOREACH(mod, &found_modules, link) { 1070 if (strcmp(mod->name, name) == 0 && (ver == 0 || mod->version == ver)) 1071 return (mod); 1072 } 1073 return (NULL); 1074 } 1075 1076 static modlist_t 1077 modlist_lookup2(const char *name, struct mod_depend *verinfo) 1078 { 1079 modlist_t mod, bestmod; 1080 int ver; 1081 1082 if (verinfo == NULL) 1083 return (modlist_lookup(name, 0)); 1084 bestmod = NULL; 1085 TAILQ_FOREACH(mod, &found_modules, link) { 1086 if (strcmp(mod->name, name) != 0) 1087 continue; 1088 ver = mod->version; 1089 if (ver == verinfo->md_ver_preferred) 1090 return (mod); 1091 if (ver >= verinfo->md_ver_minimum && 1092 ver <= verinfo->md_ver_maximum && 1093 (bestmod == NULL || ver > bestmod->version)) 1094 bestmod = mod; 1095 } 1096 return (bestmod); 1097 } 1098 1099 int 1100 linker_reference_module(const char *modname, struct mod_depend *verinfo, 1101 linker_file_t *result) 1102 { 1103 modlist_t mod; 1104 int error; 1105 1106 lockmgr(&llf_lock, LK_SHARED); 1107 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) { 1108 *result = mod->container; 1109 (*result)->refs++; 1110 lockmgr(&llf_lock, LK_RELEASE); 1111 return (0); 1112 } 1113 1114 lockmgr(&llf_lock, LK_RELEASE); 1115 /*lockmgr(&kld_lock, LK_EXCLUSIVE);*/ 1116 error = linker_load_module(NULL, modname, NULL, verinfo, result); 1117 /*lockmgr(&kld_lock, LK_RELEASE);*/ 1118 1119 return (error); 1120 } 1121 1122 int 1123 linker_release_module(const char *modname, struct mod_depend *verinfo, 1124 linker_file_t lf) 1125 { 1126 modlist_t mod; 1127 int error; 1128 1129 lockmgr(&llf_lock, LK_SHARED); 1130 if (lf == NULL) { 1131 KASSERT(modname != NULL, 1132 ("linker_release_module: no file or name")); 1133 mod = modlist_lookup2(modname, verinfo); 1134 if (mod == NULL) { 1135 lockmgr(&llf_lock, LK_RELEASE); 1136 return (ESRCH); 1137 } 1138 lf = mod->container; 1139 } else 1140 KASSERT(modname == NULL && verinfo == NULL, 1141 ("linker_release_module: both file and name")); 1142 lockmgr(&llf_lock, LK_RELEASE); 1143 /*lockmgr(&kld_lock, LK_EXCLUSIVE);*/ 1144 error = linker_file_unload(lf); 1145 /*lockmgr(&kld_lock, LK_RELEASE);*/ 1146 1147 return (error); 1148 } 1149 1150 static modlist_t 1151 modlist_newmodule(const char *modname, int version, linker_file_t container) 1152 { 1153 modlist_t mod; 1154 1155 mod = kmalloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO); 1156 if (mod == NULL) 1157 panic("no memory for module list"); 1158 mod->container = container; 1159 mod->name = modname; 1160 mod->version = version; 1161 TAILQ_INSERT_TAIL(&found_modules, mod, link); 1162 return (mod); 1163 } 1164 1165 static void 1166 linker_addmodules(linker_file_t lf, struct mod_metadata **start, 1167 struct mod_metadata **stop, int preload) 1168 { 1169 struct mod_metadata *mp, **mdp; 1170 const char *modname; 1171 int ver; 1172 1173 for (mdp = start; mdp < stop; mdp++) { 1174 mp = *mdp; 1175 if (mp->md_type != MDT_VERSION) 1176 continue; 1177 modname = mp->md_cval; 1178 ver = ((struct mod_version *)mp->md_data)->mv_version; 1179 if (modlist_lookup(modname, ver) != NULL) { 1180 kprintf("module %s already present!\n", modname); 1181 /* XXX what can we do? this is a build error. :-( */ 1182 continue; 1183 } 1184 modlist_newmodule(modname, ver, lf); 1185 } 1186 } 1187 1188 static void 1189 linker_preload(void* arg) 1190 { 1191 caddr_t modptr; 1192 const char *modname, *nmodname; 1193 char *modtype; 1194 linker_file_t lf, nlf; 1195 linker_class_t lc; 1196 int error; 1197 linker_file_list_t loaded_files; 1198 linker_file_list_t depended_files; 1199 struct mod_metadata *mp, *nmp; 1200 struct mod_metadata **start, **stop, **mdp, **nmdp; 1201 struct mod_depend *verinfo; 1202 int nver; 1203 int resolves; 1204 modlist_t mod; 1205 struct sysinit **si_start, **si_stop; 1206 1207 TAILQ_INIT(&loaded_files); 1208 TAILQ_INIT(&depended_files); 1209 TAILQ_INIT(&found_modules); 1210 1211 modptr = NULL; 1212 while ((modptr = preload_search_next_name(modptr)) != NULL) { 1213 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 1214 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 1215 if (modname == NULL) { 1216 kprintf("Preloaded module at %p does not have a name!\n", modptr); 1217 continue; 1218 } 1219 if (modtype == NULL) { 1220 kprintf("Preloaded module at %p does not have a type!\n", modptr); 1221 continue; 1222 } 1223 1224 if (bootverbose) 1225 kprintf("Preloaded %s \"%s\" at %p.\n", modtype, modname, modptr); 1226 lf = NULL; 1227 TAILQ_FOREACH(lc, &classes, link) { 1228 error = lc->ops->preload_file(modname, &lf); 1229 if (!error) 1230 break; 1231 lf = NULL; 1232 } 1233 if (lf) 1234 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 1235 } 1236 1237 /* 1238 * First get a list of stuff in the kernel. 1239 */ 1240 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, 1241 &stop, NULL) == 0) 1242 linker_addmodules(linker_kernel_file, start, stop, 1); 1243 1244 /* 1245 * This is a once-off kinky bubble sort to resolve relocation 1246 * dependency requirements. 1247 */ 1248 restart: 1249 TAILQ_FOREACH(lf, &loaded_files, loaded) { 1250 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, NULL); 1251 /* 1252 * First, look to see if we would successfully link with this 1253 * stuff. 1254 */ 1255 resolves = 1; /* unless we know otherwise */ 1256 if (!error) { 1257 for (mdp = start; mdp < stop; mdp++) { 1258 mp = *mdp; 1259 if (mp->md_type != MDT_DEPEND) 1260 continue; 1261 modname = mp->md_cval; 1262 verinfo = mp->md_data; 1263 for (nmdp = start; nmdp < stop; nmdp++) { 1264 nmp = *nmdp; 1265 if (nmp->md_type != MDT_VERSION) 1266 continue; 1267 nmodname = nmp->md_cval; 1268 if (strcmp(modname, nmodname) == 0) 1269 break; 1270 } 1271 if (nmdp < stop)/* it's a self reference */ 1272 continue; 1273 1274 /* 1275 * ok, the module isn't here yet, we 1276 * are not finished 1277 */ 1278 if (modlist_lookup2(modname, verinfo) == NULL) 1279 resolves = 0; 1280 } 1281 } 1282 /* 1283 * OK, if we found our modules, we can link. So, "provide" 1284 * the modules inside and add it to the end of the link order 1285 * list. 1286 */ 1287 if (resolves) { 1288 if (!error) { 1289 for (mdp = start; mdp < stop; mdp++) { 1290 mp = *mdp; 1291 if (mp->md_type != MDT_VERSION) 1292 continue; 1293 modname = mp->md_cval; 1294 nver = ((struct mod_version *)mp->md_data)->mv_version; 1295 if (modlist_lookup(modname, nver) != NULL) { 1296 kprintf("module %s already present!\n", modname); 1297 TAILQ_REMOVE(&loaded_files, lf, loaded); 1298 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ ); 1299 /* we changed tailq next ptr */ 1300 goto restart; 1301 } 1302 modlist_newmodule(modname, nver, lf); 1303 } 1304 } 1305 TAILQ_REMOVE(&loaded_files, lf, loaded); 1306 TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 1307 /* 1308 * Since we provided modules, we need to restart the 1309 * sort so that the previous files that depend on us 1310 * have a chance. Also, we've busted the tailq next 1311 * pointer with the REMOVE. 1312 */ 1313 goto restart; 1314 } 1315 } 1316 1317 /* 1318 * At this point, we check to see what could not be resolved.. 1319 */ 1320 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) { 1321 TAILQ_REMOVE(&loaded_files, lf, loaded); 1322 kprintf("KLD file %s is missing dependencies\n", lf->filename); 1323 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ ); 1324 } 1325 1326 /* 1327 * We made it. Finish off the linking in the order we determined. 1328 */ 1329 TAILQ_FOREACH_MUTABLE(lf, &depended_files, loaded, nlf) { 1330 if (linker_kernel_file) { 1331 linker_kernel_file->refs++; 1332 linker_file_add_dependancy(lf, linker_kernel_file); 1333 } 1334 lf->userrefs++; 1335 1336 error = linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, NULL); 1337 if (!error) { 1338 for (mdp = start; mdp < stop; mdp++) { 1339 mp = *mdp; 1340 if (mp->md_type != MDT_DEPEND) 1341 continue; 1342 modname = mp->md_cval; 1343 verinfo = mp->md_data; 1344 mod = modlist_lookup2(modname, verinfo); 1345 /* Don't count self-dependencies */ 1346 if (lf == mod->container) 1347 continue; 1348 mod->container->refs++; 1349 linker_file_add_dependancy(lf, mod->container); 1350 } 1351 } 1352 /* 1353 * Now do relocation etc using the symbol search paths 1354 * established by the dependencies 1355 */ 1356 error = lf->ops->preload_finish(lf); 1357 if (error) { 1358 TAILQ_REMOVE(&depended_files, lf, loaded); 1359 kprintf("KLD file %s - could not finalize loading\n", 1360 lf->filename); 1361 linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */); 1362 continue; 1363 } 1364 linker_file_register_modules(lf); 1365 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, &si_stop, NULL) == 0) 1366 sysinit_add(si_start, si_stop); 1367 linker_file_register_sysctls(lf); 1368 lf->flags |= LINKER_FILE_LINKED; 1369 } 1370 /* woohoo! we made it! */ 1371 } 1372 1373 SYSINIT(preload, SI_BOOT2_KLD, SI_ORDER_MIDDLE, linker_preload, 0); 1374 1375 /* 1376 * Search for a not-loaded module by name. 1377 * 1378 * Modules may be found in the following locations: 1379 * 1380 * - preloaded (result is just the module name) 1381 * - on disk (result is full path to module) 1382 * 1383 * If the module name is qualified in any way (contains path, etc.) 1384 * the we simply return a copy of it. 1385 * 1386 * The search path can be manipulated via sysctl. Note that we use the ';' 1387 * character as a separator to be consistent with the bootloader. 1388 */ 1389 1390 static char linker_path[MAXPATHLEN] = "/boot;/boot/modules;/;/modules"; 1391 1392 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path, 1393 sizeof(linker_path), "module load search path"); 1394 TUNABLE_STR("module_path", linker_path, sizeof(linker_path)); 1395 1396 char * 1397 linker_search_path(const char *name) 1398 { 1399 struct nlookupdata nd; 1400 char *cp, *ep, *result; 1401 size_t name_len, prefix_len; 1402 size_t result_len; 1403 int sep; 1404 int error; 1405 enum vtype type; 1406 const char *exts[] = { "", ".ko", NULL }; 1407 const char **ext; 1408 1409 /* qualified at all? */ 1410 if (index(name, '/')) 1411 return(linker_strdup(name)); 1412 1413 /* traverse the linker path */ 1414 cp = linker_path; 1415 name_len = strlen(name); 1416 for (;;) { 1417 1418 /* find the end of this component */ 1419 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++) 1420 ; 1421 prefix_len = ep - cp; 1422 /* if this component doesn't end with a slash, add one */ 1423 if (ep == cp || *(ep - 1) != '/') 1424 sep = 1; 1425 else 1426 sep = 0; 1427 1428 /* 1429 * +2+3 : possible separator, plus terminator + possible extension. 1430 */ 1431 result = kmalloc(prefix_len + name_len + 2+3, M_LINKER, M_WAITOK); 1432 1433 strncpy(result, cp, prefix_len); 1434 if (sep) 1435 result[prefix_len++] = '/'; 1436 strcpy(result + prefix_len, name); 1437 1438 result_len = strlen(result); 1439 for (ext = exts; *ext != NULL; ext++) { 1440 strcpy(result + result_len, *ext); 1441 1442 /* 1443 * Attempt to open the file, and return the path if we succeed and it's 1444 * a regular file. 1445 */ 1446 error = nlookup_init(&nd, result, UIO_SYSSPACE, NLC_FOLLOW|NLC_LOCKVP); 1447 if (error == 0) 1448 error = vn_open(&nd, NULL, FREAD, 0); 1449 if (error == 0) { 1450 type = nd.nl_open_vp->v_type; 1451 if (type == VREG) { 1452 nlookup_done(&nd); 1453 return (result); 1454 } 1455 } 1456 nlookup_done(&nd); 1457 } 1458 1459 kfree(result, M_LINKER); 1460 1461 if (*ep == 0) 1462 break; 1463 cp = ep + 1; 1464 } 1465 return(NULL); 1466 } 1467 1468 /* 1469 * Find a file which contains given module and load it, if "parent" is not 1470 * NULL, register a reference to it. 1471 */ 1472 static int 1473 linker_load_module(const char *kldname, const char *modname, 1474 struct linker_file *parent, struct mod_depend *verinfo, 1475 struct linker_file **lfpp) 1476 { 1477 linker_file_t lfdep; 1478 const char *filename; 1479 char *pathname; 1480 int error; 1481 1482 if (modname == NULL) { 1483 /* 1484 * We have to load KLD 1485 */ 1486 KASSERT(verinfo == NULL, ("linker_load_module: verinfo is not NULL")); 1487 pathname = linker_search_path(kldname); 1488 } else { 1489 if (modlist_lookup2(modname, verinfo) != NULL) 1490 return (EEXIST); 1491 if (kldname != NULL) 1492 { 1493 pathname = linker_strdup(kldname); 1494 } 1495 else if (rootvnode == NULL) 1496 pathname = NULL; 1497 else 1498 { 1499 pathname = linker_search_path(modname); 1500 } 1501 #if 0 1502 /* 1503 * Need to find a KLD with required module 1504 */ 1505 pathname = linker_search_module(modname, 1506 strlen(modname), verinfo); 1507 #endif 1508 } 1509 if (pathname == NULL) 1510 return (ENOENT); 1511 1512 /* 1513 * Can't load more than one file with the same basename XXX: 1514 * Actually it should be possible to have multiple KLDs with 1515 * the same basename but different path because they can 1516 * provide different versions of the same modules. 1517 */ 1518 filename = rindex(pathname, '/'); 1519 if (filename == NULL) 1520 filename = pathname; 1521 else 1522 filename++; 1523 if (linker_find_file_by_name(filename)) 1524 error = EEXIST; 1525 else 1526 do { 1527 error = linker_load_file(pathname, &lfdep); 1528 if (error) 1529 break; 1530 if (modname && verinfo && modlist_lookup2(modname, verinfo) == NULL) { 1531 linker_file_unload(lfdep /* , LINKER_UNLOAD_FORCE */ ); 1532 error = ENOENT; 1533 break; 1534 } 1535 if (parent) { 1536 linker_file_add_dependancy(parent, lfdep); 1537 } 1538 if (lfpp) 1539 *lfpp = lfdep; 1540 } while (0); 1541 kfree(pathname, M_LINKER); 1542 return (error); 1543 } 1544 1545 /* 1546 * This routine is responsible for finding dependencies of userland initiated 1547 * kldload(2)'s of files. 1548 */ 1549 int 1550 linker_load_dependencies(linker_file_t lf) 1551 { 1552 linker_file_t lfdep; 1553 struct mod_metadata **start, **stop, **mdp, **nmdp; 1554 struct mod_metadata *mp, *nmp; 1555 struct mod_depend *verinfo; 1556 modlist_t mod; 1557 const char *modname, *nmodname; 1558 int ver, error = 0, count; 1559 1560 /* 1561 * All files are dependant on /kernel. 1562 */ 1563 if (linker_kernel_file) { 1564 linker_kernel_file->refs++; 1565 linker_file_add_dependancy(lf, linker_kernel_file); 1566 } 1567 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, &count) != 0) 1568 return (0); 1569 for (mdp = start; mdp < stop; mdp++) { 1570 mp = *mdp; 1571 if (mp->md_type != MDT_VERSION) 1572 continue; 1573 modname = mp->md_cval; 1574 ver = ((struct mod_version *)mp->md_data)->mv_version; 1575 mod = modlist_lookup(modname, ver); 1576 if (mod != NULL) { 1577 kprintf("interface %s.%d already present in the KLD '%s'!\n", 1578 modname, ver, mod->container->filename); 1579 return (EEXIST); 1580 } 1581 } 1582 1583 for (mdp = start; mdp < stop; mdp++) { 1584 mp = *mdp; 1585 if (mp->md_type != MDT_DEPEND) 1586 continue; 1587 modname = mp->md_cval; 1588 verinfo = mp->md_data; 1589 nmodname = NULL; 1590 for (nmdp = start; nmdp < stop; nmdp++) { 1591 nmp = *nmdp; 1592 if (nmp->md_type != MDT_VERSION) 1593 continue; 1594 nmodname = nmp->md_cval; 1595 if (strcmp(modname, nmodname) == 0) 1596 break; 1597 } 1598 if (nmdp < stop) /* early exit, it's a self reference */ 1599 continue; 1600 mod = modlist_lookup2(modname, verinfo); 1601 if (mod) { /* woohoo, it's loaded already */ 1602 lfdep = mod->container; 1603 lfdep->refs++; 1604 linker_file_add_dependancy(lf, lfdep); 1605 continue; 1606 } 1607 error = linker_load_module(NULL, modname, lf, verinfo, NULL); 1608 if (error) { 1609 kprintf("KLD %s: depends on %s - not available or version mismatch\n", 1610 lf->filename, modname); 1611 break; 1612 } 1613 } 1614 1615 if (error) 1616 return (error); 1617 linker_addmodules(lf, start, stop, 0); 1618 return (0); 1619 } 1620