1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1998-2000 Doug Rabson 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #include "opt_ddb.h" 31 #include "opt_gdb.h" 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/lock.h> 37 #include <sys/malloc.h> 38 #ifdef SPARSE_MAPPING 39 #include <sys/mman.h> 40 #endif 41 #include <sys/mutex.h> 42 #include <sys/mount.h> 43 #include <sys/pcpu.h> 44 #include <sys/proc.h> 45 #include <sys/namei.h> 46 #include <sys/fcntl.h> 47 #include <sys/vnode.h> 48 #include <sys/linker.h> 49 #include <sys/sysctl.h> 50 #include <sys/tslog.h> 51 52 #include <machine/elf.h> 53 54 #include <net/vnet.h> 55 56 #include <security/mac/mac_framework.h> 57 58 #include <vm/vm.h> 59 #include <vm/vm_param.h> 60 #ifdef SPARSE_MAPPING 61 #include <vm/vm_object.h> 62 #include <vm/vm_kern.h> 63 #include <vm/vm_extern.h> 64 #endif 65 #include <vm/pmap.h> 66 #include <vm/vm_map.h> 67 68 #include <sys/link_elf.h> 69 70 #include "linker_if.h" 71 72 #define MAXSEGS 4 73 74 typedef struct elf_file { 75 struct linker_file lf; /* Common fields */ 76 int preloaded; /* Was file pre-loaded */ 77 caddr_t address; /* Relocation address */ 78 #ifdef SPARSE_MAPPING 79 vm_object_t object; /* VM object to hold file pages */ 80 #endif 81 Elf_Dyn *dynamic; /* Symbol table etc. */ 82 Elf_Hashelt nbuckets; /* DT_HASH info */ 83 Elf_Hashelt nchains; 84 const Elf_Hashelt *buckets; 85 const Elf_Hashelt *chains; 86 caddr_t hash; 87 caddr_t strtab; /* DT_STRTAB */ 88 int strsz; /* DT_STRSZ */ 89 const Elf_Sym *symtab; /* DT_SYMTAB */ 90 Elf_Addr *got; /* DT_PLTGOT */ 91 const Elf_Rel *pltrel; /* DT_JMPREL */ 92 int pltrelsize; /* DT_PLTRELSZ */ 93 const Elf_Rela *pltrela; /* DT_JMPREL */ 94 int pltrelasize; /* DT_PLTRELSZ */ 95 const Elf_Rel *rel; /* DT_REL */ 96 int relsize; /* DT_RELSZ */ 97 const Elf_Rela *rela; /* DT_RELA */ 98 int relasize; /* DT_RELASZ */ 99 caddr_t modptr; 100 const Elf_Sym *ddbsymtab; /* The symbol table we are using */ 101 long ddbsymcnt; /* Number of symbols */ 102 caddr_t ddbstrtab; /* String table */ 103 long ddbstrcnt; /* number of bytes in string table */ 104 caddr_t symbase; /* malloc'ed symbold base */ 105 caddr_t strbase; /* malloc'ed string base */ 106 caddr_t ctftab; /* CTF table */ 107 long ctfcnt; /* number of bytes in CTF table */ 108 caddr_t ctfoff; /* CTF offset table */ 109 caddr_t typoff; /* Type offset table */ 110 long typlen; /* Number of type entries. */ 111 Elf_Addr pcpu_start; /* Pre-relocation pcpu set start. */ 112 Elf_Addr pcpu_stop; /* Pre-relocation pcpu set stop. */ 113 Elf_Addr pcpu_base; /* Relocated pcpu set address. */ 114 #ifdef VIMAGE 115 Elf_Addr vnet_start; /* Pre-relocation vnet set start. */ 116 Elf_Addr vnet_stop; /* Pre-relocation vnet set stop. */ 117 Elf_Addr vnet_base; /* Relocated vnet set address. */ 118 #endif 119 #ifdef GDB 120 struct link_map gdb; /* hooks for gdb */ 121 #endif 122 } *elf_file_t; 123 124 struct elf_set { 125 Elf_Addr es_start; 126 Elf_Addr es_stop; 127 Elf_Addr es_base; 128 TAILQ_ENTRY(elf_set) es_link; 129 }; 130 131 TAILQ_HEAD(elf_set_head, elf_set); 132 133 #include <kern/kern_ctf.c> 134 135 static int link_elf_link_common_finish(linker_file_t); 136 static int link_elf_link_preload(linker_class_t cls, 137 const char *, linker_file_t *); 138 static int link_elf_link_preload_finish(linker_file_t); 139 static int link_elf_load_file(linker_class_t, const char *, 140 linker_file_t *); 141 static int link_elf_lookup_symbol(linker_file_t, const char *, 142 c_linker_sym_t *); 143 static int link_elf_lookup_debug_symbol(linker_file_t, const char *, 144 c_linker_sym_t *); 145 static int link_elf_symbol_values(linker_file_t, c_linker_sym_t, 146 linker_symval_t *); 147 static int link_elf_debug_symbol_values(linker_file_t, c_linker_sym_t, 148 linker_symval_t*); 149 static int link_elf_search_symbol(linker_file_t, caddr_t, 150 c_linker_sym_t *, long *); 151 152 static void link_elf_unload_file(linker_file_t); 153 static void link_elf_unload_preload(linker_file_t); 154 static int link_elf_lookup_set(linker_file_t, const char *, 155 void ***, void ***, int *); 156 static int link_elf_each_function_name(linker_file_t, 157 int (*)(const char *, void *), void *); 158 static int link_elf_each_function_nameval(linker_file_t, 159 linker_function_nameval_callback_t, void *); 160 static void link_elf_reloc_local(linker_file_t); 161 static long link_elf_symtab_get(linker_file_t, const Elf_Sym **); 162 static long link_elf_strtab_get(linker_file_t, caddr_t *); 163 static int elf_lookup(linker_file_t, Elf_Size, int, Elf_Addr *); 164 165 static kobj_method_t link_elf_methods[] = { 166 KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol), 167 KOBJMETHOD(linker_lookup_debug_symbol, link_elf_lookup_debug_symbol), 168 KOBJMETHOD(linker_symbol_values, link_elf_symbol_values), 169 KOBJMETHOD(linker_debug_symbol_values, link_elf_debug_symbol_values), 170 KOBJMETHOD(linker_search_symbol, link_elf_search_symbol), 171 KOBJMETHOD(linker_unload, link_elf_unload_file), 172 KOBJMETHOD(linker_load_file, link_elf_load_file), 173 KOBJMETHOD(linker_link_preload, link_elf_link_preload), 174 KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish), 175 KOBJMETHOD(linker_lookup_set, link_elf_lookup_set), 176 KOBJMETHOD(linker_each_function_name, link_elf_each_function_name), 177 KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval), 178 KOBJMETHOD(linker_ctf_get, link_elf_ctf_get), 179 KOBJMETHOD(linker_symtab_get, link_elf_symtab_get), 180 KOBJMETHOD(linker_strtab_get, link_elf_strtab_get), 181 KOBJMETHOD_END 182 }; 183 184 static struct linker_class link_elf_class = { 185 #if ELF_TARG_CLASS == ELFCLASS32 186 "elf32", 187 #else 188 "elf64", 189 #endif 190 link_elf_methods, sizeof(struct elf_file) 191 }; 192 193 static bool link_elf_leak_locals = true; 194 SYSCTL_BOOL(_debug, OID_AUTO, link_elf_leak_locals, 195 CTLFLAG_RWTUN, &link_elf_leak_locals, 0, 196 "Allow local symbols to participate in global module symbol resolution"); 197 198 typedef int (*elf_reloc_fn)(linker_file_t lf, Elf_Addr relocbase, 199 const void *data, int type, elf_lookup_fn lookup); 200 201 static int parse_dynamic(elf_file_t); 202 static int relocate_file(elf_file_t); 203 static int relocate_file1(elf_file_t ef, elf_lookup_fn lookup, 204 elf_reloc_fn reloc, bool ifuncs); 205 static int link_elf_preload_parse_symbols(elf_file_t); 206 207 static struct elf_set_head set_pcpu_list; 208 #ifdef VIMAGE 209 static struct elf_set_head set_vnet_list; 210 #endif 211 212 static void 213 elf_set_add(struct elf_set_head *list, Elf_Addr start, Elf_Addr stop, Elf_Addr base) 214 { 215 struct elf_set *set, *iter; 216 217 set = malloc(sizeof(*set), M_LINKER, M_WAITOK); 218 set->es_start = start; 219 set->es_stop = stop; 220 set->es_base = base; 221 222 TAILQ_FOREACH(iter, list, es_link) { 223 KASSERT((set->es_start < iter->es_start && set->es_stop < iter->es_stop) || 224 (set->es_start > iter->es_start && set->es_stop > iter->es_stop), 225 ("linker sets intersection: to insert: 0x%jx-0x%jx; inserted: 0x%jx-0x%jx", 226 (uintmax_t)set->es_start, (uintmax_t)set->es_stop, 227 (uintmax_t)iter->es_start, (uintmax_t)iter->es_stop)); 228 229 if (iter->es_start > set->es_start) { 230 TAILQ_INSERT_BEFORE(iter, set, es_link); 231 break; 232 } 233 } 234 235 if (iter == NULL) 236 TAILQ_INSERT_TAIL(list, set, es_link); 237 } 238 239 static int 240 elf_set_find(struct elf_set_head *list, Elf_Addr addr, Elf_Addr *start, Elf_Addr *base) 241 { 242 struct elf_set *set; 243 244 TAILQ_FOREACH(set, list, es_link) { 245 if (addr < set->es_start) 246 return (0); 247 if (addr < set->es_stop) { 248 *start = set->es_start; 249 *base = set->es_base; 250 return (1); 251 } 252 } 253 254 return (0); 255 } 256 257 static void 258 elf_set_delete(struct elf_set_head *list, Elf_Addr start) 259 { 260 struct elf_set *set; 261 262 TAILQ_FOREACH(set, list, es_link) { 263 if (start < set->es_start) 264 break; 265 if (start == set->es_start) { 266 TAILQ_REMOVE(list, set, es_link); 267 free(set, M_LINKER); 268 return; 269 } 270 } 271 KASSERT(0, ("deleting unknown linker set (start = 0x%jx)", 272 (uintmax_t)start)); 273 } 274 275 #ifdef GDB 276 static void r_debug_state(struct r_debug *, struct link_map *); 277 278 /* 279 * A list of loaded modules for GDB to use for loading symbols. 280 */ 281 struct r_debug r_debug; 282 283 #define GDB_STATE(s) do { \ 284 r_debug.r_state = s; r_debug_state(NULL, NULL); \ 285 } while (0) 286 287 /* 288 * Function for the debugger to set a breakpoint on to gain control. 289 */ 290 static void 291 r_debug_state(struct r_debug *dummy_one __unused, 292 struct link_map *dummy_two __unused) 293 { 294 } 295 296 static void 297 link_elf_add_gdb(struct link_map *l) 298 { 299 struct link_map *prev; 300 301 l->l_next = NULL; 302 303 if (r_debug.r_map == NULL) { 304 /* Add first. */ 305 l->l_prev = NULL; 306 r_debug.r_map = l; 307 } else { 308 /* Append to list. */ 309 for (prev = r_debug.r_map; 310 prev->l_next != NULL; 311 prev = prev->l_next) 312 ; 313 l->l_prev = prev; 314 prev->l_next = l; 315 } 316 } 317 318 static void 319 link_elf_delete_gdb(struct link_map *l) 320 { 321 if (l->l_prev == NULL) { 322 /* Remove first. */ 323 if ((r_debug.r_map = l->l_next) != NULL) 324 l->l_next->l_prev = NULL; 325 } else { 326 /* Remove any but first. */ 327 if ((l->l_prev->l_next = l->l_next) != NULL) 328 l->l_next->l_prev = l->l_prev; 329 } 330 } 331 #endif /* GDB */ 332 333 /* 334 * The kernel symbol table starts here. 335 */ 336 extern struct _dynamic _DYNAMIC; 337 338 static void 339 link_elf_error(const char *filename, const char *s) 340 { 341 if (filename == NULL) 342 printf("kldload: %s\n", s); 343 else 344 printf("kldload: %s: %s\n", filename, s); 345 } 346 347 static void 348 link_elf_invoke_ctors(caddr_t addr, size_t size) 349 { 350 void (**ctor)(void); 351 size_t i, cnt; 352 353 if (addr == NULL || size == 0) 354 return; 355 cnt = size / sizeof(*ctor); 356 ctor = (void *)addr; 357 for (i = 0; i < cnt; i++) { 358 if (ctor[i] != NULL) 359 (*ctor[i])(); 360 } 361 } 362 363 /* 364 * Actions performed after linking/loading both the preloaded kernel and any 365 * modules; whether preloaded or dynamicly loaded. 366 */ 367 static int 368 link_elf_link_common_finish(linker_file_t lf) 369 { 370 #ifdef GDB 371 elf_file_t ef = (elf_file_t)lf; 372 char *newfilename; 373 #endif 374 int error; 375 376 /* Notify MD code that a module is being loaded. */ 377 error = elf_cpu_load_file(lf); 378 if (error != 0) 379 return (error); 380 381 #ifdef GDB 382 GDB_STATE(RT_ADD); 383 ef->gdb.l_addr = lf->address; 384 newfilename = malloc(strlen(lf->filename) + 1, M_LINKER, M_WAITOK); 385 strcpy(newfilename, lf->filename); 386 ef->gdb.l_name = newfilename; 387 ef->gdb.l_ld = ef->dynamic; 388 link_elf_add_gdb(&ef->gdb); 389 GDB_STATE(RT_CONSISTENT); 390 #endif 391 392 /* Invoke .ctors */ 393 link_elf_invoke_ctors(lf->ctors_addr, lf->ctors_size); 394 return (0); 395 } 396 397 #ifdef RELOCATABLE_KERNEL 398 /* 399 * __startkernel and __endkernel are symbols set up as relocation canaries. 400 * 401 * They are defined in locore to reference linker script symbols at the 402 * beginning and end of the LOAD area. This has the desired side effect of 403 * giving us variables that have relative relocations pointing at them, so 404 * relocation of the kernel object will cause the variables to be updated 405 * automatically by the runtime linker when we initialize. 406 * 407 * There are two main reasons to relocate the kernel: 408 * 1) If the loader needed to load the kernel at an alternate load address. 409 * 2) If the kernel is switching address spaces on machines like POWER9 410 * under Radix where the high bits of the effective address are used to 411 * differentiate between hypervisor, host, guest, and problem state. 412 */ 413 extern vm_offset_t __startkernel, __endkernel; 414 #endif 415 416 static unsigned long kern_relbase = KERNBASE; 417 418 SYSCTL_ULONG(_kern, OID_AUTO, base_address, CTLFLAG_RD, 419 SYSCTL_NULL_ULONG_PTR, KERNBASE, "Kernel base address"); 420 SYSCTL_ULONG(_kern, OID_AUTO, relbase_address, CTLFLAG_RD, 421 &kern_relbase, 0, "Kernel relocated base address"); 422 423 static void 424 link_elf_init(void* arg) 425 { 426 Elf_Dyn *dp; 427 Elf_Addr *ctors_addrp; 428 Elf_Size *ctors_sizep; 429 caddr_t modptr, baseptr, sizeptr; 430 elf_file_t ef; 431 const char *modname; 432 433 linker_add_class(&link_elf_class); 434 435 dp = (Elf_Dyn *)&_DYNAMIC; 436 modname = NULL; 437 modptr = preload_search_by_type("elf" __XSTRING(__ELF_WORD_SIZE) " kernel"); 438 if (modptr == NULL) 439 modptr = preload_search_by_type("elf kernel"); 440 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 441 if (modname == NULL) 442 modname = "kernel"; 443 linker_kernel_file = linker_make_file(modname, &link_elf_class); 444 if (linker_kernel_file == NULL) 445 panic("%s: Can't create linker structures for kernel", 446 __func__); 447 448 ef = (elf_file_t) linker_kernel_file; 449 ef->preloaded = 1; 450 #ifdef RELOCATABLE_KERNEL 451 /* Compute relative displacement */ 452 ef->address = (caddr_t) (__startkernel - KERNBASE); 453 #else 454 ef->address = 0; 455 #endif 456 #ifdef SPARSE_MAPPING 457 ef->object = NULL; 458 #endif 459 ef->dynamic = dp; 460 461 if (dp != NULL) 462 parse_dynamic(ef); 463 #ifdef RELOCATABLE_KERNEL 464 linker_kernel_file->address = (caddr_t)__startkernel; 465 linker_kernel_file->size = (intptr_t)(__endkernel - __startkernel); 466 kern_relbase = (unsigned long)__startkernel; 467 #else 468 linker_kernel_file->address += KERNBASE; 469 linker_kernel_file->size = -(intptr_t)linker_kernel_file->address; 470 #endif 471 472 if (modptr != NULL) { 473 ef->modptr = modptr; 474 baseptr = preload_search_info(modptr, MODINFO_ADDR); 475 if (baseptr != NULL) 476 linker_kernel_file->address = *(caddr_t *)baseptr; 477 sizeptr = preload_search_info(modptr, MODINFO_SIZE); 478 if (sizeptr != NULL) 479 linker_kernel_file->size = *(size_t *)sizeptr; 480 ctors_addrp = (Elf_Addr *)preload_search_info(modptr, 481 MODINFO_METADATA | MODINFOMD_CTORS_ADDR); 482 ctors_sizep = (Elf_Size *)preload_search_info(modptr, 483 MODINFO_METADATA | MODINFOMD_CTORS_SIZE); 484 if (ctors_addrp != NULL && ctors_sizep != NULL) { 485 linker_kernel_file->ctors_addr = ef->address + 486 *ctors_addrp; 487 linker_kernel_file->ctors_size = *ctors_sizep; 488 } 489 } 490 (void)link_elf_preload_parse_symbols(ef); 491 492 #ifdef GDB 493 r_debug.r_map = NULL; 494 r_debug.r_brk = r_debug_state; 495 r_debug.r_state = RT_CONSISTENT; 496 #endif 497 498 (void)link_elf_link_common_finish(linker_kernel_file); 499 linker_kernel_file->flags |= LINKER_FILE_LINKED; 500 TAILQ_INIT(&set_pcpu_list); 501 #ifdef VIMAGE 502 TAILQ_INIT(&set_vnet_list); 503 #endif 504 } 505 506 SYSINIT(link_elf, SI_SUB_KLD, SI_ORDER_THIRD, link_elf_init, NULL); 507 508 static int 509 link_elf_preload_parse_symbols(elf_file_t ef) 510 { 511 caddr_t pointer; 512 caddr_t ssym, esym, base; 513 caddr_t strtab; 514 int strcnt; 515 Elf_Sym *symtab; 516 int symcnt; 517 518 if (ef->modptr == NULL) 519 return (0); 520 pointer = preload_search_info(ef->modptr, 521 MODINFO_METADATA | MODINFOMD_SSYM); 522 if (pointer == NULL) 523 return (0); 524 ssym = *(caddr_t *)pointer; 525 pointer = preload_search_info(ef->modptr, 526 MODINFO_METADATA | MODINFOMD_ESYM); 527 if (pointer == NULL) 528 return (0); 529 esym = *(caddr_t *)pointer; 530 531 base = ssym; 532 533 symcnt = *(long *)base; 534 base += sizeof(long); 535 symtab = (Elf_Sym *)base; 536 base += roundup(symcnt, sizeof(long)); 537 538 if (base > esym || base < ssym) { 539 printf("Symbols are corrupt!\n"); 540 return (EINVAL); 541 } 542 543 strcnt = *(long *)base; 544 base += sizeof(long); 545 strtab = base; 546 base += roundup(strcnt, sizeof(long)); 547 548 if (base > esym || base < ssym) { 549 printf("Symbols are corrupt!\n"); 550 return (EINVAL); 551 } 552 553 ef->ddbsymtab = symtab; 554 ef->ddbsymcnt = symcnt / sizeof(Elf_Sym); 555 ef->ddbstrtab = strtab; 556 ef->ddbstrcnt = strcnt; 557 558 return (0); 559 } 560 561 static int 562 parse_dynamic(elf_file_t ef) 563 { 564 Elf_Dyn *dp; 565 int plttype = DT_REL; 566 567 for (dp = ef->dynamic; dp->d_tag != DT_NULL; dp++) { 568 switch (dp->d_tag) { 569 case DT_HASH: 570 { 571 /* From src/libexec/rtld-elf/rtld.c */ 572 const Elf_Hashelt *hashtab = (const Elf_Hashelt *) 573 (ef->address + dp->d_un.d_ptr); 574 ef->nbuckets = hashtab[0]; 575 ef->nchains = hashtab[1]; 576 ef->buckets = hashtab + 2; 577 ef->chains = ef->buckets + ef->nbuckets; 578 break; 579 } 580 case DT_STRTAB: 581 ef->strtab = (caddr_t) (ef->address + dp->d_un.d_ptr); 582 break; 583 case DT_STRSZ: 584 ef->strsz = dp->d_un.d_val; 585 break; 586 case DT_SYMTAB: 587 ef->symtab = (Elf_Sym*) (ef->address + dp->d_un.d_ptr); 588 break; 589 case DT_SYMENT: 590 if (dp->d_un.d_val != sizeof(Elf_Sym)) 591 return (ENOEXEC); 592 break; 593 case DT_PLTGOT: 594 ef->got = (Elf_Addr *) (ef->address + dp->d_un.d_ptr); 595 break; 596 case DT_REL: 597 ef->rel = (const Elf_Rel *) (ef->address + dp->d_un.d_ptr); 598 break; 599 case DT_RELSZ: 600 ef->relsize = dp->d_un.d_val; 601 break; 602 case DT_RELENT: 603 if (dp->d_un.d_val != sizeof(Elf_Rel)) 604 return (ENOEXEC); 605 break; 606 case DT_JMPREL: 607 ef->pltrel = (const Elf_Rel *) (ef->address + dp->d_un.d_ptr); 608 break; 609 case DT_PLTRELSZ: 610 ef->pltrelsize = dp->d_un.d_val; 611 break; 612 case DT_RELA: 613 ef->rela = (const Elf_Rela *) (ef->address + dp->d_un.d_ptr); 614 break; 615 case DT_RELASZ: 616 ef->relasize = dp->d_un.d_val; 617 break; 618 case DT_RELAENT: 619 if (dp->d_un.d_val != sizeof(Elf_Rela)) 620 return (ENOEXEC); 621 break; 622 case DT_PLTREL: 623 plttype = dp->d_un.d_val; 624 if (plttype != DT_REL && plttype != DT_RELA) 625 return (ENOEXEC); 626 break; 627 #ifdef GDB 628 case DT_DEBUG: 629 dp->d_un.d_ptr = (Elf_Addr)&r_debug; 630 break; 631 #endif 632 } 633 } 634 635 if (plttype == DT_RELA) { 636 ef->pltrela = (const Elf_Rela *)ef->pltrel; 637 ef->pltrel = NULL; 638 ef->pltrelasize = ef->pltrelsize; 639 ef->pltrelsize = 0; 640 } 641 642 ef->ddbsymtab = ef->symtab; 643 ef->ddbsymcnt = ef->nchains; 644 ef->ddbstrtab = ef->strtab; 645 ef->ddbstrcnt = ef->strsz; 646 647 return elf_cpu_parse_dynamic(ef->address, ef->dynamic); 648 } 649 650 #define LS_PADDING 0x90909090 651 static int 652 parse_dpcpu(elf_file_t ef) 653 { 654 int error, size; 655 #if defined(__i386__) 656 uint32_t pad; 657 #endif 658 659 ef->pcpu_start = 0; 660 ef->pcpu_stop = 0; 661 error = link_elf_lookup_set(&ef->lf, "pcpu", (void ***)&ef->pcpu_start, 662 (void ***)&ef->pcpu_stop, NULL); 663 /* Error just means there is no pcpu set to relocate. */ 664 if (error != 0) 665 return (0); 666 size = (uintptr_t)ef->pcpu_stop - (uintptr_t)ef->pcpu_start; 667 /* Empty set? */ 668 if (size < 1) 669 return (0); 670 #if defined(__i386__) 671 /* In case we do find __start/stop_set_ symbols double-check. */ 672 if (size < 4) { 673 uprintf("Kernel module '%s' must be recompiled with " 674 "linker script\n", ef->lf.pathname); 675 return (ENOEXEC); 676 } 677 678 /* Padding from linker-script correct? */ 679 pad = *(uint32_t *)((uintptr_t)ef->pcpu_stop - sizeof(pad)); 680 if (pad != LS_PADDING) { 681 uprintf("Kernel module '%s' must be recompiled with " 682 "linker script, invalid padding %#04x (%#04x)\n", 683 ef->lf.pathname, pad, LS_PADDING); 684 return (ENOEXEC); 685 } 686 /* If we only have valid padding, nothing to do. */ 687 if (size == 4) 688 return (0); 689 #endif 690 /* 691 * Allocate space in the primary pcpu area. Copy in our 692 * initialization from the data section and then initialize 693 * all per-cpu storage from that. 694 */ 695 ef->pcpu_base = (Elf_Addr)(uintptr_t)dpcpu_alloc(size); 696 if (ef->pcpu_base == 0) { 697 printf("%s: pcpu module space is out of space; " 698 "cannot allocate %d for %s\n", 699 __func__, size, ef->lf.pathname); 700 return (ENOSPC); 701 } 702 memcpy((void *)ef->pcpu_base, (void *)ef->pcpu_start, size); 703 dpcpu_copy((void *)ef->pcpu_base, size); 704 elf_set_add(&set_pcpu_list, ef->pcpu_start, ef->pcpu_stop, 705 ef->pcpu_base); 706 707 return (0); 708 } 709 710 #ifdef VIMAGE 711 static int 712 parse_vnet(elf_file_t ef) 713 { 714 int error, size; 715 #if defined(__i386__) 716 uint32_t pad; 717 #endif 718 719 ef->vnet_start = 0; 720 ef->vnet_stop = 0; 721 error = link_elf_lookup_set(&ef->lf, "vnet", (void ***)&ef->vnet_start, 722 (void ***)&ef->vnet_stop, NULL); 723 /* Error just means there is no vnet data set to relocate. */ 724 if (error != 0) 725 return (0); 726 size = (uintptr_t)ef->vnet_stop - (uintptr_t)ef->vnet_start; 727 /* Empty set? */ 728 if (size < 1) 729 return (0); 730 #if defined(__i386__) 731 /* In case we do find __start/stop_set_ symbols double-check. */ 732 if (size < 4) { 733 uprintf("Kernel module '%s' must be recompiled with " 734 "linker script\n", ef->lf.pathname); 735 return (ENOEXEC); 736 } 737 738 /* Padding from linker-script correct? */ 739 pad = *(uint32_t *)((uintptr_t)ef->vnet_stop - sizeof(pad)); 740 if (pad != LS_PADDING) { 741 uprintf("Kernel module '%s' must be recompiled with " 742 "linker script, invalid padding %#04x (%#04x)\n", 743 ef->lf.pathname, pad, LS_PADDING); 744 return (ENOEXEC); 745 } 746 /* If we only have valid padding, nothing to do. */ 747 if (size == 4) 748 return (0); 749 #endif 750 /* 751 * Allocate space in the primary vnet area. Copy in our 752 * initialization from the data section and then initialize 753 * all per-vnet storage from that. 754 */ 755 ef->vnet_base = (Elf_Addr)(uintptr_t)vnet_data_alloc(size); 756 if (ef->vnet_base == 0) { 757 printf("%s: vnet module space is out of space; " 758 "cannot allocate %d for %s\n", 759 __func__, size, ef->lf.pathname); 760 return (ENOSPC); 761 } 762 memcpy((void *)ef->vnet_base, (void *)ef->vnet_start, size); 763 vnet_data_copy((void *)ef->vnet_base, size); 764 elf_set_add(&set_vnet_list, ef->vnet_start, ef->vnet_stop, 765 ef->vnet_base); 766 767 return (0); 768 } 769 #endif 770 #undef LS_PADDING 771 772 /* 773 * Apply the specified protection to the loadable segments of a preloaded linker 774 * file. 775 */ 776 static int 777 preload_protect(elf_file_t ef, vm_prot_t prot) 778 { 779 #if defined(__aarch64__) || defined(__amd64__) 780 Elf_Ehdr *hdr; 781 Elf_Phdr *phdr, *phlimit; 782 vm_prot_t nprot; 783 int error; 784 785 error = 0; 786 hdr = (Elf_Ehdr *)ef->address; 787 phdr = (Elf_Phdr *)(ef->address + hdr->e_phoff); 788 phlimit = phdr + hdr->e_phnum; 789 for (; phdr < phlimit; phdr++) { 790 if (phdr->p_type != PT_LOAD) 791 continue; 792 793 nprot = prot | VM_PROT_READ; 794 if ((phdr->p_flags & PF_W) != 0) 795 nprot |= VM_PROT_WRITE; 796 if ((phdr->p_flags & PF_X) != 0) 797 nprot |= VM_PROT_EXECUTE; 798 error = pmap_change_prot((vm_offset_t)ef->address + 799 phdr->p_vaddr, round_page(phdr->p_memsz), nprot); 800 if (error != 0) 801 break; 802 } 803 return (error); 804 #else 805 return (0); 806 #endif 807 } 808 809 #ifdef __arm__ 810 /* 811 * Locate the ARM exception/unwind table info for DDB and stack(9) use by 812 * searching for the section header that describes it. There may be no unwind 813 * info, for example in a module containing only data. 814 */ 815 static void 816 link_elf_locate_exidx(linker_file_t lf, Elf_Shdr *shdr, int nhdr) 817 { 818 int i; 819 820 for (i = 0; i < nhdr; i++) { 821 if (shdr[i].sh_type == SHT_ARM_EXIDX) { 822 lf->exidx_addr = shdr[i].sh_addr + lf->address; 823 lf->exidx_size = shdr[i].sh_size; 824 break; 825 } 826 } 827 } 828 829 /* 830 * Locate the section headers metadata in a preloaded module, then use it to 831 * locate the exception/unwind table in the module. The size of the metadata 832 * block is stored in a uint32 word immediately before the data itself, and a 833 * comment in preload_search_info() says it is safe to rely on that. 834 */ 835 static void 836 link_elf_locate_exidx_preload(struct linker_file *lf, caddr_t modptr) 837 { 838 uint32_t *modinfo; 839 Elf_Shdr *shdr; 840 uint32_t nhdr; 841 842 modinfo = (uint32_t *)preload_search_info(modptr, 843 MODINFO_METADATA | MODINFOMD_SHDR); 844 if (modinfo != NULL) { 845 shdr = (Elf_Shdr *)modinfo; 846 nhdr = modinfo[-1] / sizeof(Elf_Shdr); 847 link_elf_locate_exidx(lf, shdr, nhdr); 848 } 849 } 850 851 #endif /* __arm__ */ 852 853 static int 854 link_elf_link_preload(linker_class_t cls, const char *filename, 855 linker_file_t *result) 856 { 857 Elf_Addr *ctors_addrp; 858 Elf_Size *ctors_sizep; 859 caddr_t modptr, baseptr, sizeptr, dynptr; 860 char *type; 861 elf_file_t ef; 862 linker_file_t lf; 863 int error; 864 vm_offset_t dp; 865 866 /* Look to see if we have the file preloaded */ 867 modptr = preload_search_by_name(filename); 868 if (modptr == NULL) 869 return (ENOENT); 870 871 type = (char *)preload_search_info(modptr, MODINFO_TYPE); 872 baseptr = preload_search_info(modptr, MODINFO_ADDR); 873 sizeptr = preload_search_info(modptr, MODINFO_SIZE); 874 dynptr = preload_search_info(modptr, 875 MODINFO_METADATA | MODINFOMD_DYNAMIC); 876 if (type == NULL || 877 (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE) " module") != 0 && 878 strcmp(type, "elf module") != 0)) 879 return (EFTYPE); 880 if (baseptr == NULL || sizeptr == NULL || dynptr == NULL) 881 return (EINVAL); 882 883 lf = linker_make_file(filename, &link_elf_class); 884 if (lf == NULL) 885 return (ENOMEM); 886 887 ef = (elf_file_t) lf; 888 ef->preloaded = 1; 889 ef->modptr = modptr; 890 ef->address = *(caddr_t *)baseptr; 891 #ifdef SPARSE_MAPPING 892 ef->object = NULL; 893 #endif 894 dp = (vm_offset_t)ef->address + *(vm_offset_t *)dynptr; 895 ef->dynamic = (Elf_Dyn *)dp; 896 lf->address = ef->address; 897 lf->size = *(size_t *)sizeptr; 898 899 ctors_addrp = (Elf_Addr *)preload_search_info(modptr, 900 MODINFO_METADATA | MODINFOMD_CTORS_ADDR); 901 ctors_sizep = (Elf_Size *)preload_search_info(modptr, 902 MODINFO_METADATA | MODINFOMD_CTORS_SIZE); 903 if (ctors_addrp != NULL && ctors_sizep != NULL) { 904 lf->ctors_addr = ef->address + *ctors_addrp; 905 lf->ctors_size = *ctors_sizep; 906 } 907 908 #ifdef __arm__ 909 link_elf_locate_exidx_preload(lf, modptr); 910 #endif 911 912 error = parse_dynamic(ef); 913 if (error == 0) 914 error = parse_dpcpu(ef); 915 #ifdef VIMAGE 916 if (error == 0) 917 error = parse_vnet(ef); 918 #endif 919 if (error == 0) 920 error = preload_protect(ef, VM_PROT_ALL); 921 if (error != 0) { 922 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 923 return (error); 924 } 925 link_elf_reloc_local(lf); 926 *result = lf; 927 return (0); 928 } 929 930 static int 931 link_elf_link_preload_finish(linker_file_t lf) 932 { 933 elf_file_t ef; 934 int error; 935 936 ef = (elf_file_t) lf; 937 error = relocate_file(ef); 938 if (error == 0) 939 error = preload_protect(ef, VM_PROT_NONE); 940 if (error != 0) 941 return (error); 942 (void)link_elf_preload_parse_symbols(ef); 943 944 return (link_elf_link_common_finish(lf)); 945 } 946 947 static int 948 link_elf_load_file(linker_class_t cls, const char* filename, 949 linker_file_t* result) 950 { 951 struct nameidata nd; 952 struct thread* td = curthread; /* XXX */ 953 Elf_Ehdr *hdr; 954 caddr_t firstpage, segbase; 955 int nbytes, i; 956 Elf_Phdr *phdr; 957 Elf_Phdr *phlimit; 958 Elf_Phdr *segs[MAXSEGS]; 959 int nsegs; 960 Elf_Phdr *phdyn; 961 caddr_t mapbase; 962 size_t mapsize; 963 Elf_Addr base_vaddr; 964 Elf_Addr base_vlimit; 965 int error = 0; 966 ssize_t resid; 967 int flags; 968 elf_file_t ef; 969 linker_file_t lf; 970 Elf_Shdr *shdr; 971 int symtabindex; 972 int symstrindex; 973 int shstrindex; 974 int symcnt; 975 int strcnt; 976 char *shstrs; 977 978 shdr = NULL; 979 lf = NULL; 980 shstrs = NULL; 981 982 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename); 983 flags = FREAD; 984 error = vn_open(&nd, &flags, 0, NULL); 985 if (error != 0) 986 return (error); 987 NDFREE_PNBUF(&nd); 988 if (nd.ni_vp->v_type != VREG) { 989 error = ENOEXEC; 990 firstpage = NULL; 991 goto out; 992 } 993 #ifdef MAC 994 error = mac_kld_check_load(curthread->td_ucred, nd.ni_vp); 995 if (error != 0) { 996 firstpage = NULL; 997 goto out; 998 } 999 #endif 1000 1001 /* 1002 * Read the elf header from the file. 1003 */ 1004 firstpage = malloc(PAGE_SIZE, M_LINKER, M_WAITOK); 1005 hdr = (Elf_Ehdr *)firstpage; 1006 error = vn_rdwr(UIO_READ, nd.ni_vp, firstpage, PAGE_SIZE, 0, 1007 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1008 &resid, td); 1009 nbytes = PAGE_SIZE - resid; 1010 if (error != 0) 1011 goto out; 1012 1013 if (!IS_ELF(*hdr)) { 1014 error = ENOEXEC; 1015 goto out; 1016 } 1017 1018 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 1019 hdr->e_ident[EI_DATA] != ELF_TARG_DATA) { 1020 link_elf_error(filename, "Unsupported file layout"); 1021 error = ENOEXEC; 1022 goto out; 1023 } 1024 if (hdr->e_ident[EI_VERSION] != EV_CURRENT || 1025 hdr->e_version != EV_CURRENT) { 1026 link_elf_error(filename, "Unsupported file version"); 1027 error = ENOEXEC; 1028 goto out; 1029 } 1030 if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) { 1031 error = ENOSYS; 1032 goto out; 1033 } 1034 if (hdr->e_machine != ELF_TARG_MACH) { 1035 link_elf_error(filename, "Unsupported machine"); 1036 error = ENOEXEC; 1037 goto out; 1038 } 1039 1040 /* 1041 * We rely on the program header being in the first page. 1042 * This is not strictly required by the ABI specification, but 1043 * it seems to always true in practice. And, it simplifies 1044 * things considerably. 1045 */ 1046 if (!((hdr->e_phentsize == sizeof(Elf_Phdr)) && 1047 (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= PAGE_SIZE) && 1048 (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= nbytes))) 1049 link_elf_error(filename, "Unreadable program headers"); 1050 1051 /* 1052 * Scan the program header entries, and save key information. 1053 * 1054 * We rely on there being exactly two load segments, text and data, 1055 * in that order. 1056 */ 1057 phdr = (Elf_Phdr *) (firstpage + hdr->e_phoff); 1058 phlimit = phdr + hdr->e_phnum; 1059 nsegs = 0; 1060 phdyn = NULL; 1061 while (phdr < phlimit) { 1062 switch (phdr->p_type) { 1063 case PT_LOAD: 1064 if (nsegs == MAXSEGS) { 1065 link_elf_error(filename, "Too many sections"); 1066 error = ENOEXEC; 1067 goto out; 1068 } 1069 /* 1070 * XXX: We just trust they come in right order ?? 1071 */ 1072 segs[nsegs] = phdr; 1073 ++nsegs; 1074 break; 1075 1076 case PT_DYNAMIC: 1077 phdyn = phdr; 1078 break; 1079 1080 case PT_INTERP: 1081 error = ENOSYS; 1082 goto out; 1083 } 1084 1085 ++phdr; 1086 } 1087 if (phdyn == NULL) { 1088 link_elf_error(filename, "Object is not dynamically-linked"); 1089 error = ENOEXEC; 1090 goto out; 1091 } 1092 if (nsegs == 0) { 1093 link_elf_error(filename, "No sections"); 1094 error = ENOEXEC; 1095 goto out; 1096 } 1097 1098 /* 1099 * Allocate the entire address space of the object, to stake 1100 * out our contiguous region, and to establish the base 1101 * address for relocation. 1102 */ 1103 base_vaddr = trunc_page(segs[0]->p_vaddr); 1104 base_vlimit = round_page(segs[nsegs - 1]->p_vaddr + 1105 segs[nsegs - 1]->p_memsz); 1106 mapsize = base_vlimit - base_vaddr; 1107 1108 lf = linker_make_file(filename, &link_elf_class); 1109 if (lf == NULL) { 1110 error = ENOMEM; 1111 goto out; 1112 } 1113 1114 ef = (elf_file_t) lf; 1115 #ifdef SPARSE_MAPPING 1116 ef->object = vm_pager_allocate(OBJT_PHYS, NULL, mapsize, VM_PROT_ALL, 1117 0, thread0.td_ucred); 1118 if (ef->object == NULL) { 1119 error = ENOMEM; 1120 goto out; 1121 } 1122 #ifdef __amd64__ 1123 mapbase = (caddr_t)KERNBASE; 1124 #else 1125 mapbase = (caddr_t)vm_map_min(kernel_map); 1126 #endif 1127 /* 1128 * Mapping protections are downgraded after relocation processing. 1129 */ 1130 error = vm_map_find(kernel_map, ef->object, 0, 1131 (vm_offset_t *)&mapbase, mapsize, 0, VMFS_OPTIMAL_SPACE, 1132 VM_PROT_ALL, VM_PROT_ALL, 0); 1133 if (error != 0) { 1134 vm_object_deallocate(ef->object); 1135 ef->object = NULL; 1136 goto out; 1137 } 1138 #else 1139 mapbase = malloc_exec(mapsize, M_LINKER, M_WAITOK); 1140 #endif 1141 ef->address = mapbase; 1142 1143 /* 1144 * Read the text and data sections and zero the bss. 1145 */ 1146 for (i = 0; i < nsegs; i++) { 1147 segbase = mapbase + segs[i]->p_vaddr - base_vaddr; 1148 1149 #ifdef SPARSE_MAPPING 1150 /* 1151 * Consecutive segments may have different mapping permissions, 1152 * so be strict and verify that their mappings do not overlap. 1153 */ 1154 if (((vm_offset_t)segbase & PAGE_MASK) != 0) { 1155 error = EINVAL; 1156 goto out; 1157 } 1158 1159 error = vm_map_wire(kernel_map, 1160 (vm_offset_t)segbase, 1161 (vm_offset_t)segbase + round_page(segs[i]->p_memsz), 1162 VM_MAP_WIRE_SYSTEM | VM_MAP_WIRE_NOHOLES); 1163 if (error != KERN_SUCCESS) { 1164 error = ENOMEM; 1165 goto out; 1166 } 1167 #endif 1168 1169 error = vn_rdwr(UIO_READ, nd.ni_vp, 1170 segbase, segs[i]->p_filesz, segs[i]->p_offset, 1171 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1172 &resid, td); 1173 if (error != 0) 1174 goto out; 1175 bzero(segbase + segs[i]->p_filesz, 1176 segs[i]->p_memsz - segs[i]->p_filesz); 1177 } 1178 1179 ef->dynamic = (Elf_Dyn *) (mapbase + phdyn->p_vaddr - base_vaddr); 1180 1181 lf->address = ef->address; 1182 lf->size = mapsize; 1183 1184 error = parse_dynamic(ef); 1185 if (error != 0) 1186 goto out; 1187 error = parse_dpcpu(ef); 1188 if (error != 0) 1189 goto out; 1190 #ifdef VIMAGE 1191 error = parse_vnet(ef); 1192 if (error != 0) 1193 goto out; 1194 #endif 1195 link_elf_reloc_local(lf); 1196 1197 VOP_UNLOCK(nd.ni_vp); 1198 error = linker_load_dependencies(lf); 1199 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 1200 if (error != 0) 1201 goto out; 1202 error = relocate_file(ef); 1203 if (error != 0) 1204 goto out; 1205 1206 #ifdef SPARSE_MAPPING 1207 /* 1208 * Downgrade permissions on text segment mappings now that relocation 1209 * processing is complete. Restrict permissions on read-only segments. 1210 */ 1211 for (i = 0; i < nsegs; i++) { 1212 vm_prot_t prot; 1213 1214 if (segs[i]->p_type != PT_LOAD) 1215 continue; 1216 1217 prot = VM_PROT_READ; 1218 if ((segs[i]->p_flags & PF_W) != 0) 1219 prot |= VM_PROT_WRITE; 1220 if ((segs[i]->p_flags & PF_X) != 0) 1221 prot |= VM_PROT_EXECUTE; 1222 segbase = mapbase + segs[i]->p_vaddr - base_vaddr; 1223 error = vm_map_protect(kernel_map, 1224 (vm_offset_t)segbase, 1225 (vm_offset_t)segbase + round_page(segs[i]->p_memsz), 1226 prot, 0, VM_MAP_PROTECT_SET_PROT); 1227 if (error != KERN_SUCCESS) { 1228 error = ENOMEM; 1229 goto out; 1230 } 1231 } 1232 #endif 1233 1234 /* 1235 * Try and load the symbol table if it's present. (you can 1236 * strip it!) 1237 */ 1238 nbytes = hdr->e_shnum * hdr->e_shentsize; 1239 if (nbytes == 0 || hdr->e_shoff == 0) 1240 goto nosyms; 1241 shdr = malloc(nbytes, M_LINKER, M_WAITOK | M_ZERO); 1242 error = vn_rdwr(UIO_READ, nd.ni_vp, 1243 (caddr_t)shdr, nbytes, hdr->e_shoff, 1244 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1245 &resid, td); 1246 if (error != 0) 1247 goto out; 1248 1249 /* Read section string table */ 1250 shstrindex = hdr->e_shstrndx; 1251 if (shstrindex != 0 && shdr[shstrindex].sh_type == SHT_STRTAB && 1252 shdr[shstrindex].sh_size != 0) { 1253 nbytes = shdr[shstrindex].sh_size; 1254 shstrs = malloc(nbytes, M_LINKER, M_WAITOK | M_ZERO); 1255 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shstrs, nbytes, 1256 shdr[shstrindex].sh_offset, UIO_SYSSPACE, IO_NODELOCKED, 1257 td->td_ucred, NOCRED, &resid, td); 1258 if (error) 1259 goto out; 1260 } 1261 1262 symtabindex = -1; 1263 symstrindex = -1; 1264 for (i = 0; i < hdr->e_shnum; i++) { 1265 if (shdr[i].sh_type == SHT_SYMTAB) { 1266 symtabindex = i; 1267 symstrindex = shdr[i].sh_link; 1268 } else if (shstrs != NULL && shdr[i].sh_name != 0 && 1269 strcmp(shstrs + shdr[i].sh_name, ".ctors") == 0) { 1270 /* Record relocated address and size of .ctors. */ 1271 lf->ctors_addr = mapbase + shdr[i].sh_addr - base_vaddr; 1272 lf->ctors_size = shdr[i].sh_size; 1273 } 1274 } 1275 if (symtabindex < 0 || symstrindex < 0) 1276 goto nosyms; 1277 1278 symcnt = shdr[symtabindex].sh_size; 1279 ef->symbase = malloc(symcnt, M_LINKER, M_WAITOK); 1280 strcnt = shdr[symstrindex].sh_size; 1281 ef->strbase = malloc(strcnt, M_LINKER, M_WAITOK); 1282 1283 error = vn_rdwr(UIO_READ, nd.ni_vp, 1284 ef->symbase, symcnt, shdr[symtabindex].sh_offset, 1285 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1286 &resid, td); 1287 if (error != 0) 1288 goto out; 1289 error = vn_rdwr(UIO_READ, nd.ni_vp, 1290 ef->strbase, strcnt, shdr[symstrindex].sh_offset, 1291 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1292 &resid, td); 1293 if (error != 0) 1294 goto out; 1295 1296 ef->ddbsymcnt = symcnt / sizeof(Elf_Sym); 1297 ef->ddbsymtab = (const Elf_Sym *)ef->symbase; 1298 ef->ddbstrcnt = strcnt; 1299 ef->ddbstrtab = ef->strbase; 1300 1301 nosyms: 1302 1303 #ifdef __arm__ 1304 link_elf_locate_exidx(lf, shdr, hdr->e_shnum); 1305 #endif 1306 1307 error = link_elf_link_common_finish(lf); 1308 if (error != 0) 1309 goto out; 1310 1311 *result = lf; 1312 1313 out: 1314 VOP_UNLOCK(nd.ni_vp); 1315 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 1316 if (error != 0 && lf != NULL) 1317 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1318 free(shdr, M_LINKER); 1319 free(firstpage, M_LINKER); 1320 free(shstrs, M_LINKER); 1321 1322 return (error); 1323 } 1324 1325 Elf_Addr 1326 elf_relocaddr(linker_file_t lf, Elf_Addr x) 1327 { 1328 elf_file_t ef; 1329 1330 KASSERT(lf->ops->cls == (kobj_class_t)&link_elf_class, 1331 ("elf_relocaddr: unexpected linker file %p", lf)); 1332 1333 ef = (elf_file_t)lf; 1334 if (x >= ef->pcpu_start && x < ef->pcpu_stop) 1335 return ((x - ef->pcpu_start) + ef->pcpu_base); 1336 #ifdef VIMAGE 1337 if (x >= ef->vnet_start && x < ef->vnet_stop) 1338 return ((x - ef->vnet_start) + ef->vnet_base); 1339 #endif 1340 return (x); 1341 } 1342 1343 static void 1344 link_elf_unload_file(linker_file_t file) 1345 { 1346 elf_file_t ef = (elf_file_t) file; 1347 1348 if (ef->pcpu_base != 0) { 1349 dpcpu_free((void *)ef->pcpu_base, 1350 ef->pcpu_stop - ef->pcpu_start); 1351 elf_set_delete(&set_pcpu_list, ef->pcpu_start); 1352 } 1353 #ifdef VIMAGE 1354 if (ef->vnet_base != 0) { 1355 vnet_data_free((void *)ef->vnet_base, 1356 ef->vnet_stop - ef->vnet_start); 1357 elf_set_delete(&set_vnet_list, ef->vnet_start); 1358 } 1359 #endif 1360 #ifdef GDB 1361 if (ef->gdb.l_ld != NULL) { 1362 GDB_STATE(RT_DELETE); 1363 free((void *)(uintptr_t)ef->gdb.l_name, M_LINKER); 1364 link_elf_delete_gdb(&ef->gdb); 1365 GDB_STATE(RT_CONSISTENT); 1366 } 1367 #endif 1368 1369 /* Notify MD code that a module is being unloaded. */ 1370 elf_cpu_unload_file(file); 1371 1372 if (ef->preloaded) { 1373 link_elf_unload_preload(file); 1374 return; 1375 } 1376 1377 #ifdef SPARSE_MAPPING 1378 if (ef->object != NULL) { 1379 vm_map_remove(kernel_map, (vm_offset_t) ef->address, 1380 (vm_offset_t) ef->address 1381 + (ef->object->size << PAGE_SHIFT)); 1382 } 1383 #else 1384 free(ef->address, M_LINKER); 1385 #endif 1386 free(ef->symbase, M_LINKER); 1387 free(ef->strbase, M_LINKER); 1388 free(ef->ctftab, M_LINKER); 1389 free(ef->ctfoff, M_LINKER); 1390 free(ef->typoff, M_LINKER); 1391 } 1392 1393 static void 1394 link_elf_unload_preload(linker_file_t file) 1395 { 1396 1397 if (file->pathname != NULL) 1398 preload_delete_name(file->pathname); 1399 } 1400 1401 static const char * 1402 symbol_name(elf_file_t ef, Elf_Size r_info) 1403 { 1404 const Elf_Sym *ref; 1405 1406 if (ELF_R_SYM(r_info)) { 1407 ref = ef->symtab + ELF_R_SYM(r_info); 1408 return (ef->strtab + ref->st_name); 1409 } 1410 return (NULL); 1411 } 1412 1413 static int 1414 symbol_type(elf_file_t ef, Elf_Size r_info) 1415 { 1416 const Elf_Sym *ref; 1417 1418 if (ELF_R_SYM(r_info)) { 1419 ref = ef->symtab + ELF_R_SYM(r_info); 1420 return (ELF_ST_TYPE(ref->st_info)); 1421 } 1422 return (STT_NOTYPE); 1423 } 1424 1425 static int 1426 relocate_file1(elf_file_t ef, elf_lookup_fn lookup, elf_reloc_fn reloc, 1427 bool ifuncs) 1428 { 1429 const Elf_Rel *rel; 1430 const Elf_Rela *rela; 1431 const char *symname; 1432 1433 TSENTER(); 1434 #define APPLY_RELOCS(iter, tbl, tblsize, type) do { \ 1435 for ((iter) = (tbl); (iter) != NULL && \ 1436 (iter) < (tbl) + (tblsize) / sizeof(*(iter)); (iter)++) { \ 1437 if ((symbol_type(ef, (iter)->r_info) == \ 1438 STT_GNU_IFUNC || \ 1439 elf_is_ifunc_reloc((iter)->r_info)) != ifuncs) \ 1440 continue; \ 1441 if (reloc(&ef->lf, (Elf_Addr)ef->address, \ 1442 (iter), (type), lookup)) { \ 1443 symname = symbol_name(ef, (iter)->r_info); \ 1444 printf("link_elf: symbol %s undefined\n", \ 1445 symname); \ 1446 return (ENOENT); \ 1447 } \ 1448 } \ 1449 } while (0) 1450 1451 APPLY_RELOCS(rel, ef->rel, ef->relsize, ELF_RELOC_REL); 1452 TSENTER2("ef->rela"); 1453 APPLY_RELOCS(rela, ef->rela, ef->relasize, ELF_RELOC_RELA); 1454 TSEXIT2("ef->rela"); 1455 APPLY_RELOCS(rel, ef->pltrel, ef->pltrelsize, ELF_RELOC_REL); 1456 APPLY_RELOCS(rela, ef->pltrela, ef->pltrelasize, ELF_RELOC_RELA); 1457 1458 #undef APPLY_RELOCS 1459 1460 TSEXIT(); 1461 return (0); 1462 } 1463 1464 static int 1465 relocate_file(elf_file_t ef) 1466 { 1467 int error; 1468 1469 error = relocate_file1(ef, elf_lookup, elf_reloc, false); 1470 if (error == 0) 1471 error = relocate_file1(ef, elf_lookup, elf_reloc, true); 1472 return (error); 1473 } 1474 1475 /* 1476 * SysV hash function for symbol table lookup. It is specified by the 1477 * System V ABI. 1478 */ 1479 static Elf32_Word 1480 elf_hash(const char *name) 1481 { 1482 const unsigned char *p = (const unsigned char *)name; 1483 Elf32_Word h = 0; 1484 1485 while (*p != '\0') { 1486 h = (h << 4) + *p++; 1487 h ^= (h >> 24) & 0xf0; 1488 } 1489 return (h & 0x0fffffff); 1490 } 1491 1492 static int 1493 link_elf_lookup_symbol1(linker_file_t lf, const char *name, c_linker_sym_t *sym, 1494 bool see_local) 1495 { 1496 elf_file_t ef = (elf_file_t) lf; 1497 unsigned long symnum; 1498 const Elf_Sym* symp; 1499 const char *strp; 1500 Elf32_Word hash; 1501 1502 /* If we don't have a hash, bail. */ 1503 if (ef->buckets == NULL || ef->nbuckets == 0) { 1504 printf("link_elf_lookup_symbol: missing symbol hash table\n"); 1505 return (ENOENT); 1506 } 1507 1508 /* First, search hashed global symbols */ 1509 hash = elf_hash(name); 1510 symnum = ef->buckets[hash % ef->nbuckets]; 1511 1512 while (symnum != STN_UNDEF) { 1513 if (symnum >= ef->nchains) { 1514 printf("%s: corrupt symbol table\n", __func__); 1515 return (ENOENT); 1516 } 1517 1518 symp = ef->symtab + symnum; 1519 if (symp->st_name == 0) { 1520 printf("%s: corrupt symbol table\n", __func__); 1521 return (ENOENT); 1522 } 1523 1524 strp = ef->strtab + symp->st_name; 1525 1526 if (strcmp(name, strp) == 0) { 1527 if (symp->st_shndx != SHN_UNDEF || 1528 (symp->st_value != 0 && 1529 (ELF_ST_TYPE(symp->st_info) == STT_FUNC || 1530 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC))) { 1531 if (see_local || 1532 ELF_ST_BIND(symp->st_info) != STB_LOCAL) { 1533 *sym = (c_linker_sym_t) symp; 1534 return (0); 1535 } 1536 } 1537 return (ENOENT); 1538 } 1539 1540 symnum = ef->chains[symnum]; 1541 } 1542 1543 return (ENOENT); 1544 } 1545 1546 static int 1547 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym) 1548 { 1549 if (link_elf_leak_locals) 1550 return (link_elf_lookup_debug_symbol(lf, name, sym)); 1551 return (link_elf_lookup_symbol1(lf, name, sym, false)); 1552 } 1553 1554 static int 1555 link_elf_lookup_debug_symbol(linker_file_t lf, const char *name, 1556 c_linker_sym_t *sym) 1557 { 1558 elf_file_t ef = (elf_file_t)lf; 1559 const Elf_Sym* symp; 1560 const char *strp; 1561 int i; 1562 1563 if (link_elf_lookup_symbol1(lf, name, sym, true) == 0) 1564 return (0); 1565 1566 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1567 strp = ef->ddbstrtab + symp->st_name; 1568 if (strcmp(name, strp) == 0) { 1569 if (symp->st_shndx != SHN_UNDEF || 1570 (symp->st_value != 0 && 1571 (ELF_ST_TYPE(symp->st_info) == STT_FUNC || 1572 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC))) { 1573 *sym = (c_linker_sym_t) symp; 1574 return (0); 1575 } 1576 return (ENOENT); 1577 } 1578 } 1579 1580 return (ENOENT); 1581 } 1582 1583 static int 1584 link_elf_symbol_values1(linker_file_t lf, c_linker_sym_t sym, 1585 linker_symval_t *symval, bool see_local) 1586 { 1587 elf_file_t ef; 1588 const Elf_Sym *es; 1589 caddr_t val; 1590 1591 ef = (elf_file_t)lf; 1592 es = (const Elf_Sym *)sym; 1593 if (es >= ef->symtab && es < ef->symtab + ef->nchains) { 1594 if (!see_local && ELF_ST_BIND(es->st_info) == STB_LOCAL) 1595 return (ENOENT); 1596 symval->name = ef->strtab + es->st_name; 1597 val = (caddr_t)ef->address + es->st_value; 1598 if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC) 1599 val = ((caddr_t (*)(void))val)(); 1600 symval->value = val; 1601 symval->size = es->st_size; 1602 return (0); 1603 } 1604 return (ENOENT); 1605 } 1606 1607 static int 1608 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym, 1609 linker_symval_t *symval) 1610 { 1611 if (link_elf_leak_locals) 1612 return (link_elf_debug_symbol_values(lf, sym, symval)); 1613 return (link_elf_symbol_values1(lf, sym, symval, false)); 1614 } 1615 1616 static int 1617 link_elf_debug_symbol_values(linker_file_t lf, c_linker_sym_t sym, 1618 linker_symval_t *symval) 1619 { 1620 elf_file_t ef = (elf_file_t)lf; 1621 const Elf_Sym *es = (const Elf_Sym *)sym; 1622 caddr_t val; 1623 1624 if (link_elf_symbol_values1(lf, sym, symval, true) == 0) 1625 return (0); 1626 if (ef->symtab == ef->ddbsymtab) 1627 return (ENOENT); 1628 1629 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) { 1630 symval->name = ef->ddbstrtab + es->st_name; 1631 val = (caddr_t)ef->address + es->st_value; 1632 if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC) 1633 val = ((caddr_t (*)(void))val)(); 1634 symval->value = val; 1635 symval->size = es->st_size; 1636 return (0); 1637 } 1638 return (ENOENT); 1639 } 1640 1641 static int 1642 link_elf_search_symbol(linker_file_t lf, caddr_t value, 1643 c_linker_sym_t *sym, long *diffp) 1644 { 1645 elf_file_t ef = (elf_file_t)lf; 1646 u_long off = (uintptr_t)(void *)value; 1647 u_long diff = off; 1648 u_long st_value; 1649 const Elf_Sym *es; 1650 const Elf_Sym *best = NULL; 1651 int i; 1652 1653 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) { 1654 if (es->st_name == 0) 1655 continue; 1656 st_value = es->st_value + (uintptr_t) (void *) ef->address; 1657 if (off >= st_value) { 1658 if (off - st_value < diff) { 1659 diff = off - st_value; 1660 best = es; 1661 if (diff == 0) 1662 break; 1663 } else if (off - st_value == diff) { 1664 best = es; 1665 } 1666 } 1667 } 1668 if (best == NULL) 1669 *diffp = off; 1670 else 1671 *diffp = diff; 1672 *sym = (c_linker_sym_t) best; 1673 1674 return (0); 1675 } 1676 1677 /* 1678 * Look up a linker set on an ELF system. 1679 */ 1680 static int 1681 link_elf_lookup_set(linker_file_t lf, const char *name, 1682 void ***startp, void ***stopp, int *countp) 1683 { 1684 c_linker_sym_t sym; 1685 linker_symval_t symval; 1686 char *setsym; 1687 void **start, **stop; 1688 int len, error = 0, count; 1689 1690 len = strlen(name) + sizeof("__start_set_"); /* sizeof includes \0 */ 1691 setsym = malloc(len, M_LINKER, M_WAITOK); 1692 1693 /* get address of first entry */ 1694 snprintf(setsym, len, "%s%s", "__start_set_", name); 1695 error = link_elf_lookup_symbol(lf, setsym, &sym); 1696 if (error != 0) 1697 goto out; 1698 link_elf_symbol_values(lf, sym, &symval); 1699 if (symval.value == 0) { 1700 error = ESRCH; 1701 goto out; 1702 } 1703 start = (void **)symval.value; 1704 1705 /* get address of last entry */ 1706 snprintf(setsym, len, "%s%s", "__stop_set_", name); 1707 error = link_elf_lookup_symbol(lf, setsym, &sym); 1708 if (error != 0) 1709 goto out; 1710 link_elf_symbol_values(lf, sym, &symval); 1711 if (symval.value == 0) { 1712 error = ESRCH; 1713 goto out; 1714 } 1715 stop = (void **)symval.value; 1716 1717 /* and the number of entries */ 1718 count = stop - start; 1719 1720 /* and copy out */ 1721 if (startp != NULL) 1722 *startp = start; 1723 if (stopp != NULL) 1724 *stopp = stop; 1725 if (countp != NULL) 1726 *countp = count; 1727 1728 out: 1729 free(setsym, M_LINKER); 1730 return (error); 1731 } 1732 1733 static int 1734 link_elf_each_function_name(linker_file_t file, 1735 int (*callback)(const char *, void *), void *opaque) 1736 { 1737 elf_file_t ef = (elf_file_t)file; 1738 const Elf_Sym *symp; 1739 int i, error; 1740 1741 /* Exhaustive search */ 1742 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1743 if (symp->st_value != 0 && 1744 (ELF_ST_TYPE(symp->st_info) == STT_FUNC || 1745 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) { 1746 error = callback(ef->ddbstrtab + symp->st_name, opaque); 1747 if (error != 0) 1748 return (error); 1749 } 1750 } 1751 return (0); 1752 } 1753 1754 static int 1755 link_elf_each_function_nameval(linker_file_t file, 1756 linker_function_nameval_callback_t callback, void *opaque) 1757 { 1758 linker_symval_t symval; 1759 elf_file_t ef = (elf_file_t)file; 1760 const Elf_Sym *symp; 1761 int i, error; 1762 1763 /* Exhaustive search */ 1764 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1765 if (symp->st_value != 0 && 1766 (ELF_ST_TYPE(symp->st_info) == STT_FUNC || 1767 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) { 1768 error = link_elf_debug_symbol_values(file, 1769 (c_linker_sym_t) symp, &symval); 1770 if (error == 0) 1771 error = callback(file, i, &symval, opaque); 1772 if (error != 0) 1773 return (error); 1774 } 1775 } 1776 return (0); 1777 } 1778 1779 const Elf_Sym * 1780 elf_get_sym(linker_file_t lf, Elf_Size symidx) 1781 { 1782 elf_file_t ef = (elf_file_t)lf; 1783 1784 if (symidx >= ef->nchains) 1785 return (NULL); 1786 return (ef->symtab + symidx); 1787 } 1788 1789 const char * 1790 elf_get_symname(linker_file_t lf, Elf_Size symidx) 1791 { 1792 elf_file_t ef = (elf_file_t)lf; 1793 const Elf_Sym *sym; 1794 1795 if (symidx >= ef->nchains) 1796 return (NULL); 1797 sym = ef->symtab + symidx; 1798 return (ef->strtab + sym->st_name); 1799 } 1800 1801 /* 1802 * Symbol lookup function that can be used when the symbol index is known (ie 1803 * in relocations). It uses the symbol index instead of doing a fully fledged 1804 * hash table based lookup when such is valid. For example for local symbols. 1805 * This is not only more efficient, it's also more correct. It's not always 1806 * the case that the symbol can be found through the hash table. 1807 */ 1808 static int 1809 elf_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *res) 1810 { 1811 elf_file_t ef = (elf_file_t)lf; 1812 const Elf_Sym *sym; 1813 const char *symbol; 1814 Elf_Addr addr, start, base; 1815 1816 /* Don't even try to lookup the symbol if the index is bogus. */ 1817 if (symidx >= ef->nchains) { 1818 *res = 0; 1819 return (EINVAL); 1820 } 1821 1822 sym = ef->symtab + symidx; 1823 1824 /* 1825 * Don't do a full lookup when the symbol is local. It may even 1826 * fail because it may not be found through the hash table. 1827 */ 1828 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) { 1829 /* Force lookup failure when we have an insanity. */ 1830 if (sym->st_shndx == SHN_UNDEF || sym->st_value == 0) { 1831 *res = 0; 1832 return (EINVAL); 1833 } 1834 *res = ((Elf_Addr)ef->address + sym->st_value); 1835 return (0); 1836 } 1837 1838 /* 1839 * XXX we can avoid doing a hash table based lookup for global 1840 * symbols as well. This however is not always valid, so we'll 1841 * just do it the hard way for now. Performance tweaks can 1842 * always be added. 1843 */ 1844 1845 symbol = ef->strtab + sym->st_name; 1846 1847 /* Force a lookup failure if the symbol name is bogus. */ 1848 if (*symbol == 0) { 1849 *res = 0; 1850 return (EINVAL); 1851 } 1852 1853 addr = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps)); 1854 if (addr == 0 && ELF_ST_BIND(sym->st_info) != STB_WEAK) { 1855 *res = 0; 1856 return (EINVAL); 1857 } 1858 1859 if (elf_set_find(&set_pcpu_list, addr, &start, &base)) 1860 addr = addr - start + base; 1861 #ifdef VIMAGE 1862 else if (elf_set_find(&set_vnet_list, addr, &start, &base)) 1863 addr = addr - start + base; 1864 #endif 1865 *res = addr; 1866 return (0); 1867 } 1868 1869 static void 1870 link_elf_reloc_local(linker_file_t lf) 1871 { 1872 const Elf_Rel *rellim; 1873 const Elf_Rel *rel; 1874 const Elf_Rela *relalim; 1875 const Elf_Rela *rela; 1876 elf_file_t ef = (elf_file_t)lf; 1877 1878 /* Perform relocations without addend if there are any: */ 1879 if ((rel = ef->rel) != NULL) { 1880 rellim = (const Elf_Rel *)((const char *)ef->rel + ef->relsize); 1881 while (rel < rellim) { 1882 elf_reloc_local(lf, (Elf_Addr)ef->address, rel, 1883 ELF_RELOC_REL, elf_lookup); 1884 rel++; 1885 } 1886 } 1887 1888 /* Perform relocations with addend if there are any: */ 1889 if ((rela = ef->rela) != NULL) { 1890 relalim = (const Elf_Rela *) 1891 ((const char *)ef->rela + ef->relasize); 1892 while (rela < relalim) { 1893 elf_reloc_local(lf, (Elf_Addr)ef->address, rela, 1894 ELF_RELOC_RELA, elf_lookup); 1895 rela++; 1896 } 1897 } 1898 } 1899 1900 static long 1901 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab) 1902 { 1903 elf_file_t ef = (elf_file_t)lf; 1904 1905 *symtab = ef->ddbsymtab; 1906 1907 if (*symtab == NULL) 1908 return (0); 1909 1910 return (ef->ddbsymcnt); 1911 } 1912 1913 static long 1914 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab) 1915 { 1916 elf_file_t ef = (elf_file_t)lf; 1917 1918 *strtab = ef->ddbstrtab; 1919 1920 if (*strtab == NULL) 1921 return (0); 1922 1923 return (ef->ddbstrcnt); 1924 } 1925 1926 #if defined(__i386__) || defined(__amd64__) || defined(__aarch64__) || defined(__powerpc__) 1927 /* 1928 * Use this lookup routine when performing relocations early during boot. 1929 * The generic lookup routine depends on kobj, which is not initialized 1930 * at that point. 1931 */ 1932 static int 1933 elf_lookup_ifunc(linker_file_t lf, Elf_Size symidx, int deps __unused, 1934 Elf_Addr *res) 1935 { 1936 elf_file_t ef; 1937 const Elf_Sym *symp; 1938 caddr_t val; 1939 1940 ef = (elf_file_t)lf; 1941 symp = ef->symtab + symidx; 1942 if (ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC) { 1943 val = (caddr_t)ef->address + symp->st_value; 1944 *res = ((Elf_Addr (*)(void))val)(); 1945 return (0); 1946 } 1947 return (ENOENT); 1948 } 1949 1950 void 1951 link_elf_ireloc(caddr_t kmdp) 1952 { 1953 struct elf_file eff; 1954 elf_file_t ef; 1955 1956 TSENTER(); 1957 ef = &eff; 1958 1959 bzero_early(ef, sizeof(*ef)); 1960 1961 ef->modptr = kmdp; 1962 ef->dynamic = (Elf_Dyn *)&_DYNAMIC; 1963 1964 #ifdef RELOCATABLE_KERNEL 1965 ef->address = (caddr_t) (__startkernel - KERNBASE); 1966 #else 1967 ef->address = 0; 1968 #endif 1969 parse_dynamic(ef); 1970 1971 link_elf_preload_parse_symbols(ef); 1972 relocate_file1(ef, elf_lookup_ifunc, elf_reloc, true); 1973 TSEXIT(); 1974 } 1975 1976 #if defined(__aarch64__) || defined(__amd64__) 1977 void 1978 link_elf_late_ireloc(void) 1979 { 1980 elf_file_t ef; 1981 1982 KASSERT(linker_kernel_file != NULL, 1983 ("link_elf_late_ireloc: No kernel linker file found")); 1984 ef = (elf_file_t)linker_kernel_file; 1985 1986 relocate_file1(ef, elf_lookup_ifunc, elf_reloc_late, true); 1987 } 1988 #endif 1989 #endif 1990