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 #ifdef VIMAGE 164 static void link_elf_propagate_vnets(linker_file_t); 165 #endif 166 static int elf_lookup(linker_file_t, Elf_Size, int, Elf_Addr *); 167 168 static kobj_method_t link_elf_methods[] = { 169 KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol), 170 KOBJMETHOD(linker_lookup_debug_symbol, link_elf_lookup_debug_symbol), 171 KOBJMETHOD(linker_symbol_values, link_elf_symbol_values), 172 KOBJMETHOD(linker_debug_symbol_values, link_elf_debug_symbol_values), 173 KOBJMETHOD(linker_search_symbol, link_elf_search_symbol), 174 KOBJMETHOD(linker_unload, link_elf_unload_file), 175 KOBJMETHOD(linker_load_file, link_elf_load_file), 176 KOBJMETHOD(linker_link_preload, link_elf_link_preload), 177 KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish), 178 KOBJMETHOD(linker_lookup_set, link_elf_lookup_set), 179 KOBJMETHOD(linker_each_function_name, link_elf_each_function_name), 180 KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval), 181 KOBJMETHOD(linker_ctf_get, link_elf_ctf_get), 182 KOBJMETHOD(linker_symtab_get, link_elf_symtab_get), 183 KOBJMETHOD(linker_strtab_get, link_elf_strtab_get), 184 #ifdef VIMAGE 185 KOBJMETHOD(linker_propagate_vnets, link_elf_propagate_vnets), 186 #endif 187 KOBJMETHOD_END 188 }; 189 190 static struct linker_class link_elf_class = { 191 #if ELF_TARG_CLASS == ELFCLASS32 192 "elf32", 193 #else 194 "elf64", 195 #endif 196 link_elf_methods, sizeof(struct elf_file) 197 }; 198 199 static bool link_elf_leak_locals = true; 200 SYSCTL_BOOL(_debug, OID_AUTO, link_elf_leak_locals, 201 CTLFLAG_RWTUN, &link_elf_leak_locals, 0, 202 "Allow local symbols to participate in global module symbol resolution"); 203 204 typedef int (*elf_reloc_fn)(linker_file_t lf, Elf_Addr relocbase, 205 const void *data, int type, elf_lookup_fn lookup); 206 207 static int parse_dynamic(elf_file_t); 208 static int relocate_file(elf_file_t); 209 static int relocate_file1(elf_file_t ef, elf_lookup_fn lookup, 210 elf_reloc_fn reloc, bool ifuncs); 211 static int link_elf_preload_parse_symbols(elf_file_t); 212 213 static struct elf_set_head set_pcpu_list; 214 #ifdef VIMAGE 215 static struct elf_set_head set_vnet_list; 216 #endif 217 218 static void 219 elf_set_add(struct elf_set_head *list, Elf_Addr start, Elf_Addr stop, Elf_Addr base) 220 { 221 struct elf_set *set, *iter; 222 223 set = malloc(sizeof(*set), M_LINKER, M_WAITOK); 224 set->es_start = start; 225 set->es_stop = stop; 226 set->es_base = base; 227 228 TAILQ_FOREACH(iter, list, es_link) { 229 KASSERT((set->es_start < iter->es_start && set->es_stop < iter->es_stop) || 230 (set->es_start > iter->es_start && set->es_stop > iter->es_stop), 231 ("linker sets intersection: to insert: 0x%jx-0x%jx; inserted: 0x%jx-0x%jx", 232 (uintmax_t)set->es_start, (uintmax_t)set->es_stop, 233 (uintmax_t)iter->es_start, (uintmax_t)iter->es_stop)); 234 235 if (iter->es_start > set->es_start) { 236 TAILQ_INSERT_BEFORE(iter, set, es_link); 237 break; 238 } 239 } 240 241 if (iter == NULL) 242 TAILQ_INSERT_TAIL(list, set, es_link); 243 } 244 245 static int 246 elf_set_find(struct elf_set_head *list, Elf_Addr addr, Elf_Addr *start, Elf_Addr *base) 247 { 248 struct elf_set *set; 249 250 TAILQ_FOREACH(set, list, es_link) { 251 if (addr < set->es_start) 252 return (0); 253 if (addr < set->es_stop) { 254 *start = set->es_start; 255 *base = set->es_base; 256 return (1); 257 } 258 } 259 260 return (0); 261 } 262 263 static void 264 elf_set_delete(struct elf_set_head *list, Elf_Addr start) 265 { 266 struct elf_set *set; 267 268 TAILQ_FOREACH(set, list, es_link) { 269 if (start < set->es_start) 270 break; 271 if (start == set->es_start) { 272 TAILQ_REMOVE(list, set, es_link); 273 free(set, M_LINKER); 274 return; 275 } 276 } 277 KASSERT(0, ("deleting unknown linker set (start = 0x%jx)", 278 (uintmax_t)start)); 279 } 280 281 #ifdef GDB 282 static void r_debug_state(struct r_debug *, struct link_map *); 283 284 /* 285 * A list of loaded modules for GDB to use for loading symbols. 286 */ 287 struct r_debug r_debug; 288 289 #define GDB_STATE(s) do { \ 290 r_debug.r_state = s; r_debug_state(NULL, NULL); \ 291 } while (0) 292 293 /* 294 * Function for the debugger to set a breakpoint on to gain control. 295 */ 296 static void 297 r_debug_state(struct r_debug *dummy_one __unused, 298 struct link_map *dummy_two __unused) 299 { 300 } 301 302 static void 303 link_elf_add_gdb(struct link_map *l) 304 { 305 struct link_map *prev; 306 307 l->l_next = NULL; 308 309 if (r_debug.r_map == NULL) { 310 /* Add first. */ 311 l->l_prev = NULL; 312 r_debug.r_map = l; 313 } else { 314 /* Append to list. */ 315 for (prev = r_debug.r_map; 316 prev->l_next != NULL; 317 prev = prev->l_next) 318 ; 319 l->l_prev = prev; 320 prev->l_next = l; 321 } 322 } 323 324 static void 325 link_elf_delete_gdb(struct link_map *l) 326 { 327 if (l->l_prev == NULL) { 328 /* Remove first. */ 329 if ((r_debug.r_map = l->l_next) != NULL) 330 l->l_next->l_prev = NULL; 331 } else { 332 /* Remove any but first. */ 333 if ((l->l_prev->l_next = l->l_next) != NULL) 334 l->l_next->l_prev = l->l_prev; 335 } 336 } 337 #endif /* GDB */ 338 339 /* 340 * The kernel symbol table starts here. 341 */ 342 extern struct _dynamic _DYNAMIC; 343 344 static void 345 link_elf_error(const char *filename, const char *s) 346 { 347 if (filename == NULL) 348 printf("kldload: %s\n", s); 349 else 350 printf("kldload: %s: %s\n", filename, s); 351 } 352 353 static void 354 link_elf_invoke_ctors(caddr_t addr, size_t size) 355 { 356 void (**ctor)(void); 357 size_t i, cnt; 358 359 if (addr == NULL || size == 0) 360 return; 361 cnt = size / sizeof(*ctor); 362 ctor = (void *)addr; 363 for (i = 0; i < cnt; i++) { 364 if (ctor[i] != NULL) 365 (*ctor[i])(); 366 } 367 } 368 369 /* 370 * Actions performed after linking/loading both the preloaded kernel and any 371 * modules; whether preloaded or dynamicly loaded. 372 */ 373 static int 374 link_elf_link_common_finish(linker_file_t lf) 375 { 376 #ifdef GDB 377 elf_file_t ef = (elf_file_t)lf; 378 char *newfilename; 379 #endif 380 int error; 381 382 /* Notify MD code that a module is being loaded. */ 383 error = elf_cpu_load_file(lf); 384 if (error != 0) 385 return (error); 386 387 #ifdef GDB 388 GDB_STATE(RT_ADD); 389 ef->gdb.l_addr = lf->address; 390 newfilename = malloc(strlen(lf->filename) + 1, M_LINKER, M_WAITOK); 391 strcpy(newfilename, lf->filename); 392 ef->gdb.l_name = newfilename; 393 ef->gdb.l_ld = ef->dynamic; 394 link_elf_add_gdb(&ef->gdb); 395 GDB_STATE(RT_CONSISTENT); 396 #endif 397 398 /* Invoke .ctors */ 399 link_elf_invoke_ctors(lf->ctors_addr, lf->ctors_size); 400 return (0); 401 } 402 403 #ifdef RELOCATABLE_KERNEL 404 /* 405 * __startkernel and __endkernel are symbols set up as relocation canaries. 406 * 407 * They are defined in locore to reference linker script symbols at the 408 * beginning and end of the LOAD area. This has the desired side effect of 409 * giving us variables that have relative relocations pointing at them, so 410 * relocation of the kernel object will cause the variables to be updated 411 * automatically by the runtime linker when we initialize. 412 * 413 * There are two main reasons to relocate the kernel: 414 * 1) If the loader needed to load the kernel at an alternate load address. 415 * 2) If the kernel is switching address spaces on machines like POWER9 416 * under Radix where the high bits of the effective address are used to 417 * differentiate between hypervisor, host, guest, and problem state. 418 */ 419 extern vm_offset_t __startkernel, __endkernel; 420 #endif 421 422 static unsigned long kern_relbase = KERNBASE; 423 424 SYSCTL_ULONG(_kern, OID_AUTO, base_address, CTLFLAG_RD, 425 SYSCTL_NULL_ULONG_PTR, KERNBASE, "Kernel base address"); 426 SYSCTL_ULONG(_kern, OID_AUTO, relbase_address, CTLFLAG_RD, 427 &kern_relbase, 0, "Kernel relocated base address"); 428 429 static void 430 link_elf_init(void* arg) 431 { 432 Elf_Dyn *dp; 433 Elf_Addr *ctors_addrp; 434 Elf_Size *ctors_sizep; 435 caddr_t modptr, baseptr, sizeptr; 436 elf_file_t ef; 437 const char *modname; 438 439 linker_add_class(&link_elf_class); 440 441 dp = (Elf_Dyn *)&_DYNAMIC; 442 modname = NULL; 443 modptr = preload_search_by_type("elf" __XSTRING(__ELF_WORD_SIZE) " kernel"); 444 if (modptr == NULL) 445 modptr = preload_search_by_type("elf kernel"); 446 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 447 if (modname == NULL) 448 modname = "kernel"; 449 linker_kernel_file = linker_make_file(modname, &link_elf_class); 450 if (linker_kernel_file == NULL) 451 panic("%s: Can't create linker structures for kernel", 452 __func__); 453 454 ef = (elf_file_t) linker_kernel_file; 455 ef->preloaded = 1; 456 #ifdef RELOCATABLE_KERNEL 457 /* Compute relative displacement */ 458 ef->address = (caddr_t) (__startkernel - KERNBASE); 459 #else 460 ef->address = 0; 461 #endif 462 #ifdef SPARSE_MAPPING 463 ef->object = NULL; 464 #endif 465 ef->dynamic = dp; 466 467 if (dp != NULL) 468 parse_dynamic(ef); 469 #ifdef RELOCATABLE_KERNEL 470 linker_kernel_file->address = (caddr_t)__startkernel; 471 linker_kernel_file->size = (intptr_t)(__endkernel - __startkernel); 472 kern_relbase = (unsigned long)__startkernel; 473 #else 474 linker_kernel_file->address += KERNBASE; 475 linker_kernel_file->size = -(intptr_t)linker_kernel_file->address; 476 #endif 477 478 if (modptr != NULL) { 479 ef->modptr = modptr; 480 baseptr = preload_search_info(modptr, MODINFO_ADDR); 481 if (baseptr != NULL) 482 linker_kernel_file->address = *(caddr_t *)baseptr; 483 sizeptr = preload_search_info(modptr, MODINFO_SIZE); 484 if (sizeptr != NULL) 485 linker_kernel_file->size = *(size_t *)sizeptr; 486 ctors_addrp = (Elf_Addr *)preload_search_info(modptr, 487 MODINFO_METADATA | MODINFOMD_CTORS_ADDR); 488 ctors_sizep = (Elf_Size *)preload_search_info(modptr, 489 MODINFO_METADATA | MODINFOMD_CTORS_SIZE); 490 if (ctors_addrp != NULL && ctors_sizep != NULL) { 491 linker_kernel_file->ctors_addr = ef->address + 492 *ctors_addrp; 493 linker_kernel_file->ctors_size = *ctors_sizep; 494 } 495 } 496 (void)link_elf_preload_parse_symbols(ef); 497 498 #ifdef GDB 499 r_debug.r_map = NULL; 500 r_debug.r_brk = r_debug_state; 501 r_debug.r_state = RT_CONSISTENT; 502 #endif 503 504 (void)link_elf_link_common_finish(linker_kernel_file); 505 linker_kernel_file->flags |= LINKER_FILE_LINKED; 506 TAILQ_INIT(&set_pcpu_list); 507 #ifdef VIMAGE 508 TAILQ_INIT(&set_vnet_list); 509 #endif 510 } 511 512 SYSINIT(link_elf, SI_SUB_KLD, SI_ORDER_THIRD, link_elf_init, NULL); 513 514 static int 515 link_elf_preload_parse_symbols(elf_file_t ef) 516 { 517 caddr_t pointer; 518 caddr_t ssym, esym, base; 519 caddr_t strtab; 520 int strcnt; 521 Elf_Sym *symtab; 522 int symcnt; 523 524 if (ef->modptr == NULL) 525 return (0); 526 pointer = preload_search_info(ef->modptr, 527 MODINFO_METADATA | MODINFOMD_SSYM); 528 if (pointer == NULL) 529 return (0); 530 ssym = *(caddr_t *)pointer; 531 pointer = preload_search_info(ef->modptr, 532 MODINFO_METADATA | MODINFOMD_ESYM); 533 if (pointer == NULL) 534 return (0); 535 esym = *(caddr_t *)pointer; 536 537 base = ssym; 538 539 symcnt = *(long *)base; 540 base += sizeof(long); 541 symtab = (Elf_Sym *)base; 542 base += roundup(symcnt, sizeof(long)); 543 544 if (base > esym || base < ssym) { 545 printf("Symbols are corrupt!\n"); 546 return (EINVAL); 547 } 548 549 strcnt = *(long *)base; 550 base += sizeof(long); 551 strtab = base; 552 base += roundup(strcnt, sizeof(long)); 553 554 if (base > esym || base < ssym) { 555 printf("Symbols are corrupt!\n"); 556 return (EINVAL); 557 } 558 559 ef->ddbsymtab = symtab; 560 ef->ddbsymcnt = symcnt / sizeof(Elf_Sym); 561 ef->ddbstrtab = strtab; 562 ef->ddbstrcnt = strcnt; 563 564 return (0); 565 } 566 567 static int 568 parse_dynamic(elf_file_t ef) 569 { 570 Elf_Dyn *dp; 571 int plttype = DT_REL; 572 573 for (dp = ef->dynamic; dp->d_tag != DT_NULL; dp++) { 574 switch (dp->d_tag) { 575 case DT_HASH: 576 { 577 /* From src/libexec/rtld-elf/rtld.c */ 578 const Elf_Hashelt *hashtab = (const Elf_Hashelt *) 579 (ef->address + dp->d_un.d_ptr); 580 ef->nbuckets = hashtab[0]; 581 ef->nchains = hashtab[1]; 582 ef->buckets = hashtab + 2; 583 ef->chains = ef->buckets + ef->nbuckets; 584 break; 585 } 586 case DT_STRTAB: 587 ef->strtab = (caddr_t) (ef->address + dp->d_un.d_ptr); 588 break; 589 case DT_STRSZ: 590 ef->strsz = dp->d_un.d_val; 591 break; 592 case DT_SYMTAB: 593 ef->symtab = (Elf_Sym*) (ef->address + dp->d_un.d_ptr); 594 break; 595 case DT_SYMENT: 596 if (dp->d_un.d_val != sizeof(Elf_Sym)) 597 return (ENOEXEC); 598 break; 599 case DT_PLTGOT: 600 ef->got = (Elf_Addr *) (ef->address + dp->d_un.d_ptr); 601 break; 602 case DT_REL: 603 ef->rel = (const Elf_Rel *) (ef->address + dp->d_un.d_ptr); 604 break; 605 case DT_RELSZ: 606 ef->relsize = dp->d_un.d_val; 607 break; 608 case DT_RELENT: 609 if (dp->d_un.d_val != sizeof(Elf_Rel)) 610 return (ENOEXEC); 611 break; 612 case DT_JMPREL: 613 ef->pltrel = (const Elf_Rel *) (ef->address + dp->d_un.d_ptr); 614 break; 615 case DT_PLTRELSZ: 616 ef->pltrelsize = dp->d_un.d_val; 617 break; 618 case DT_RELA: 619 ef->rela = (const Elf_Rela *) (ef->address + dp->d_un.d_ptr); 620 break; 621 case DT_RELASZ: 622 ef->relasize = dp->d_un.d_val; 623 break; 624 case DT_RELAENT: 625 if (dp->d_un.d_val != sizeof(Elf_Rela)) 626 return (ENOEXEC); 627 break; 628 case DT_PLTREL: 629 plttype = dp->d_un.d_val; 630 if (plttype != DT_REL && plttype != DT_RELA) 631 return (ENOEXEC); 632 break; 633 #ifdef GDB 634 case DT_DEBUG: 635 dp->d_un.d_ptr = (Elf_Addr)&r_debug; 636 break; 637 #endif 638 } 639 } 640 641 if (plttype == DT_RELA) { 642 ef->pltrela = (const Elf_Rela *)ef->pltrel; 643 ef->pltrel = NULL; 644 ef->pltrelasize = ef->pltrelsize; 645 ef->pltrelsize = 0; 646 } 647 648 ef->ddbsymtab = ef->symtab; 649 ef->ddbsymcnt = ef->nchains; 650 ef->ddbstrtab = ef->strtab; 651 ef->ddbstrcnt = ef->strsz; 652 653 return elf_cpu_parse_dynamic(ef->address, ef->dynamic); 654 } 655 656 #define LS_PADDING 0x90909090 657 static int 658 parse_dpcpu(elf_file_t ef) 659 { 660 int error, size; 661 #if defined(__i386__) 662 uint32_t pad; 663 #endif 664 665 ef->pcpu_start = 0; 666 ef->pcpu_stop = 0; 667 error = link_elf_lookup_set(&ef->lf, "pcpu", (void ***)&ef->pcpu_start, 668 (void ***)&ef->pcpu_stop, NULL); 669 /* Error just means there is no pcpu set to relocate. */ 670 if (error != 0) 671 return (0); 672 size = (uintptr_t)ef->pcpu_stop - (uintptr_t)ef->pcpu_start; 673 /* Empty set? */ 674 if (size < 1) 675 return (0); 676 #if defined(__i386__) 677 /* In case we do find __start/stop_set_ symbols double-check. */ 678 if (size < 4) { 679 uprintf("Kernel module '%s' must be recompiled with " 680 "linker script\n", ef->lf.pathname); 681 return (ENOEXEC); 682 } 683 684 /* Padding from linker-script correct? */ 685 pad = *(uint32_t *)((uintptr_t)ef->pcpu_stop - sizeof(pad)); 686 if (pad != LS_PADDING) { 687 uprintf("Kernel module '%s' must be recompiled with " 688 "linker script, invalid padding %#04x (%#04x)\n", 689 ef->lf.pathname, pad, LS_PADDING); 690 return (ENOEXEC); 691 } 692 /* If we only have valid padding, nothing to do. */ 693 if (size == 4) 694 return (0); 695 #endif 696 /* 697 * Allocate space in the primary pcpu area. Copy in our 698 * initialization from the data section and then initialize 699 * all per-cpu storage from that. 700 */ 701 ef->pcpu_base = (Elf_Addr)(uintptr_t)dpcpu_alloc(size); 702 if (ef->pcpu_base == 0) { 703 printf("%s: pcpu module space is out of space; " 704 "cannot allocate %d for %s\n", 705 __func__, size, ef->lf.pathname); 706 return (ENOSPC); 707 } 708 memcpy((void *)ef->pcpu_base, (void *)ef->pcpu_start, size); 709 dpcpu_copy((void *)ef->pcpu_base, size); 710 elf_set_add(&set_pcpu_list, ef->pcpu_start, ef->pcpu_stop, 711 ef->pcpu_base); 712 713 return (0); 714 } 715 716 #ifdef VIMAGE 717 static int 718 parse_vnet(elf_file_t ef) 719 { 720 int error, size; 721 #if defined(__i386__) 722 uint32_t pad; 723 #endif 724 725 ef->vnet_start = 0; 726 ef->vnet_stop = 0; 727 ef->vnet_base = 0; 728 error = link_elf_lookup_set(&ef->lf, "vnet", (void ***)&ef->vnet_start, 729 (void ***)&ef->vnet_stop, NULL); 730 /* Error just means there is no vnet data set to relocate. */ 731 if (error != 0) 732 return (0); 733 size = (uintptr_t)ef->vnet_stop - (uintptr_t)ef->vnet_start; 734 /* Empty set? */ 735 if (size < 1) 736 return (0); 737 #if defined(__i386__) 738 /* In case we do find __start/stop_set_ symbols double-check. */ 739 if (size < 4) { 740 uprintf("Kernel module '%s' must be recompiled with " 741 "linker script\n", ef->lf.pathname); 742 return (ENOEXEC); 743 } 744 745 /* Padding from linker-script correct? */ 746 pad = *(uint32_t *)((uintptr_t)ef->vnet_stop - sizeof(pad)); 747 if (pad != LS_PADDING) { 748 uprintf("Kernel module '%s' must be recompiled with " 749 "linker script, invalid padding %#04x (%#04x)\n", 750 ef->lf.pathname, pad, LS_PADDING); 751 return (ENOEXEC); 752 } 753 /* If we only have valid padding, nothing to do. */ 754 if (size == 4) 755 return (0); 756 #endif 757 /* 758 * Allocate space in the primary vnet area. Copy in our 759 * initialization from the data section and then initialize 760 * all per-vnet storage from that. 761 */ 762 ef->vnet_base = (Elf_Addr)(uintptr_t)vnet_data_alloc(size); 763 if (ef->vnet_base == 0) { 764 printf("%s: vnet module space is out of space; " 765 "cannot allocate %d for %s\n", 766 __func__, size, ef->lf.pathname); 767 return (ENOSPC); 768 } 769 memcpy((void *)ef->vnet_base, (void *)ef->vnet_start, size); 770 elf_set_add(&set_vnet_list, ef->vnet_start, ef->vnet_stop, 771 ef->vnet_base); 772 773 return (0); 774 } 775 #endif 776 #undef LS_PADDING 777 778 /* 779 * Apply the specified protection to the loadable segments of a preloaded linker 780 * file. 781 */ 782 static int 783 preload_protect(elf_file_t ef, vm_prot_t prot) 784 { 785 #if defined(__aarch64__) || defined(__amd64__) 786 Elf_Ehdr *hdr; 787 Elf_Phdr *phdr, *phlimit; 788 vm_prot_t nprot; 789 int error; 790 791 error = 0; 792 hdr = (Elf_Ehdr *)ef->address; 793 phdr = (Elf_Phdr *)(ef->address + hdr->e_phoff); 794 phlimit = phdr + hdr->e_phnum; 795 for (; phdr < phlimit; phdr++) { 796 if (phdr->p_type != PT_LOAD) 797 continue; 798 799 nprot = prot | VM_PROT_READ; 800 if ((phdr->p_flags & PF_W) != 0) 801 nprot |= VM_PROT_WRITE; 802 if ((phdr->p_flags & PF_X) != 0) 803 nprot |= VM_PROT_EXECUTE; 804 error = pmap_change_prot((vm_offset_t)ef->address + 805 phdr->p_vaddr, round_page(phdr->p_memsz), nprot); 806 if (error != 0) 807 break; 808 } 809 return (error); 810 #else 811 return (0); 812 #endif 813 } 814 815 #ifdef __arm__ 816 /* 817 * Locate the ARM exception/unwind table info for DDB and stack(9) use by 818 * searching for the section header that describes it. There may be no unwind 819 * info, for example in a module containing only data. 820 */ 821 static void 822 link_elf_locate_exidx(linker_file_t lf, Elf_Shdr *shdr, int nhdr) 823 { 824 int i; 825 826 for (i = 0; i < nhdr; i++) { 827 if (shdr[i].sh_type == SHT_ARM_EXIDX) { 828 lf->exidx_addr = shdr[i].sh_addr + lf->address; 829 lf->exidx_size = shdr[i].sh_size; 830 break; 831 } 832 } 833 } 834 835 /* 836 * Locate the section headers metadata in a preloaded module, then use it to 837 * locate the exception/unwind table in the module. The size of the metadata 838 * block is stored in a uint32 word immediately before the data itself, and a 839 * comment in preload_search_info() says it is safe to rely on that. 840 */ 841 static void 842 link_elf_locate_exidx_preload(struct linker_file *lf, caddr_t modptr) 843 { 844 uint32_t *modinfo; 845 Elf_Shdr *shdr; 846 uint32_t nhdr; 847 848 modinfo = (uint32_t *)preload_search_info(modptr, 849 MODINFO_METADATA | MODINFOMD_SHDR); 850 if (modinfo != NULL) { 851 shdr = (Elf_Shdr *)modinfo; 852 nhdr = modinfo[-1] / sizeof(Elf_Shdr); 853 link_elf_locate_exidx(lf, shdr, nhdr); 854 } 855 } 856 857 #endif /* __arm__ */ 858 859 static int 860 link_elf_link_preload(linker_class_t cls, const char *filename, 861 linker_file_t *result) 862 { 863 Elf_Addr *ctors_addrp; 864 Elf_Size *ctors_sizep; 865 caddr_t modptr, baseptr, sizeptr, dynptr; 866 char *type; 867 elf_file_t ef; 868 linker_file_t lf; 869 int error; 870 vm_offset_t dp; 871 872 /* Look to see if we have the file preloaded */ 873 modptr = preload_search_by_name(filename); 874 if (modptr == NULL) 875 return (ENOENT); 876 877 type = (char *)preload_search_info(modptr, MODINFO_TYPE); 878 baseptr = preload_search_info(modptr, MODINFO_ADDR); 879 sizeptr = preload_search_info(modptr, MODINFO_SIZE); 880 dynptr = preload_search_info(modptr, 881 MODINFO_METADATA | MODINFOMD_DYNAMIC); 882 if (type == NULL || 883 (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE) " module") != 0 && 884 strcmp(type, "elf module") != 0)) 885 return (EFTYPE); 886 if (baseptr == NULL || sizeptr == NULL || dynptr == NULL) 887 return (EINVAL); 888 889 lf = linker_make_file(filename, &link_elf_class); 890 if (lf == NULL) 891 return (ENOMEM); 892 893 ef = (elf_file_t) lf; 894 ef->preloaded = 1; 895 ef->modptr = modptr; 896 ef->address = *(caddr_t *)baseptr; 897 #ifdef SPARSE_MAPPING 898 ef->object = NULL; 899 #endif 900 dp = (vm_offset_t)ef->address + *(vm_offset_t *)dynptr; 901 ef->dynamic = (Elf_Dyn *)dp; 902 lf->address = ef->address; 903 lf->size = *(size_t *)sizeptr; 904 905 ctors_addrp = (Elf_Addr *)preload_search_info(modptr, 906 MODINFO_METADATA | MODINFOMD_CTORS_ADDR); 907 ctors_sizep = (Elf_Size *)preload_search_info(modptr, 908 MODINFO_METADATA | MODINFOMD_CTORS_SIZE); 909 if (ctors_addrp != NULL && ctors_sizep != NULL) { 910 lf->ctors_addr = ef->address + *ctors_addrp; 911 lf->ctors_size = *ctors_sizep; 912 } 913 914 #ifdef __arm__ 915 link_elf_locate_exidx_preload(lf, modptr); 916 #endif 917 918 error = parse_dynamic(ef); 919 if (error == 0) 920 error = parse_dpcpu(ef); 921 #ifdef VIMAGE 922 if (error == 0) 923 error = parse_vnet(ef); 924 #endif 925 if (error == 0) 926 error = preload_protect(ef, VM_PROT_ALL); 927 if (error != 0) { 928 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 929 return (error); 930 } 931 link_elf_reloc_local(lf); 932 *result = lf; 933 return (0); 934 } 935 936 static int 937 link_elf_link_preload_finish(linker_file_t lf) 938 { 939 elf_file_t ef; 940 int error; 941 942 ef = (elf_file_t) lf; 943 error = relocate_file(ef); 944 if (error == 0) 945 error = preload_protect(ef, VM_PROT_NONE); 946 if (error != 0) 947 return (error); 948 (void)link_elf_preload_parse_symbols(ef); 949 950 return (link_elf_link_common_finish(lf)); 951 } 952 953 static int 954 link_elf_load_file(linker_class_t cls, const char* filename, 955 linker_file_t* result) 956 { 957 struct nameidata nd; 958 struct thread* td = curthread; /* XXX */ 959 Elf_Ehdr *hdr; 960 caddr_t firstpage, segbase; 961 int nbytes, i; 962 Elf_Phdr *phdr; 963 Elf_Phdr *phlimit; 964 Elf_Phdr *segs[MAXSEGS]; 965 int nsegs; 966 Elf_Phdr *phdyn; 967 caddr_t mapbase; 968 size_t mapsize; 969 Elf_Addr base_vaddr; 970 Elf_Addr base_vlimit; 971 int error = 0; 972 ssize_t resid; 973 int flags; 974 elf_file_t ef; 975 linker_file_t lf; 976 Elf_Shdr *shdr; 977 int symtabindex; 978 int symstrindex; 979 int shstrindex; 980 int symcnt; 981 int strcnt; 982 char *shstrs; 983 984 shdr = NULL; 985 lf = NULL; 986 shstrs = NULL; 987 988 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename); 989 flags = FREAD; 990 error = vn_open(&nd, &flags, 0, NULL); 991 if (error != 0) 992 return (error); 993 NDFREE_PNBUF(&nd); 994 if (nd.ni_vp->v_type != VREG) { 995 error = ENOEXEC; 996 firstpage = NULL; 997 goto out; 998 } 999 #ifdef MAC 1000 error = mac_kld_check_load(curthread->td_ucred, nd.ni_vp); 1001 if (error != 0) { 1002 firstpage = NULL; 1003 goto out; 1004 } 1005 #endif 1006 1007 /* 1008 * Read the elf header from the file. 1009 */ 1010 firstpage = malloc(PAGE_SIZE, M_LINKER, M_WAITOK); 1011 hdr = (Elf_Ehdr *)firstpage; 1012 error = vn_rdwr(UIO_READ, nd.ni_vp, firstpage, PAGE_SIZE, 0, 1013 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1014 &resid, td); 1015 nbytes = PAGE_SIZE - resid; 1016 if (error != 0) 1017 goto out; 1018 1019 if (!IS_ELF(*hdr)) { 1020 error = ENOEXEC; 1021 goto out; 1022 } 1023 1024 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 1025 hdr->e_ident[EI_DATA] != ELF_TARG_DATA) { 1026 link_elf_error(filename, "Unsupported file layout"); 1027 error = ENOEXEC; 1028 goto out; 1029 } 1030 if (hdr->e_ident[EI_VERSION] != EV_CURRENT || 1031 hdr->e_version != EV_CURRENT) { 1032 link_elf_error(filename, "Unsupported file version"); 1033 error = ENOEXEC; 1034 goto out; 1035 } 1036 if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) { 1037 error = ENOSYS; 1038 goto out; 1039 } 1040 if (hdr->e_machine != ELF_TARG_MACH) { 1041 link_elf_error(filename, "Unsupported machine"); 1042 error = ENOEXEC; 1043 goto out; 1044 } 1045 1046 /* 1047 * We rely on the program header being in the first page. 1048 * This is not strictly required by the ABI specification, but 1049 * it seems to always true in practice. And, it simplifies 1050 * things considerably. 1051 */ 1052 if (!((hdr->e_phentsize == sizeof(Elf_Phdr)) && 1053 (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= PAGE_SIZE) && 1054 (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= nbytes))) 1055 link_elf_error(filename, "Unreadable program headers"); 1056 1057 /* 1058 * Scan the program header entries, and save key information. 1059 * 1060 * We rely on there being exactly two load segments, text and data, 1061 * in that order. 1062 */ 1063 phdr = (Elf_Phdr *) (firstpage + hdr->e_phoff); 1064 phlimit = phdr + hdr->e_phnum; 1065 nsegs = 0; 1066 phdyn = NULL; 1067 while (phdr < phlimit) { 1068 switch (phdr->p_type) { 1069 case PT_LOAD: 1070 if (nsegs == MAXSEGS) { 1071 link_elf_error(filename, "Too many sections"); 1072 error = ENOEXEC; 1073 goto out; 1074 } 1075 /* 1076 * XXX: We just trust they come in right order ?? 1077 */ 1078 segs[nsegs] = phdr; 1079 ++nsegs; 1080 break; 1081 1082 case PT_DYNAMIC: 1083 phdyn = phdr; 1084 break; 1085 1086 case PT_INTERP: 1087 error = ENOSYS; 1088 goto out; 1089 } 1090 1091 ++phdr; 1092 } 1093 if (phdyn == NULL) { 1094 link_elf_error(filename, "Object is not dynamically-linked"); 1095 error = ENOEXEC; 1096 goto out; 1097 } 1098 if (nsegs == 0) { 1099 link_elf_error(filename, "No sections"); 1100 error = ENOEXEC; 1101 goto out; 1102 } 1103 1104 /* 1105 * Allocate the entire address space of the object, to stake 1106 * out our contiguous region, and to establish the base 1107 * address for relocation. 1108 */ 1109 base_vaddr = trunc_page(segs[0]->p_vaddr); 1110 base_vlimit = round_page(segs[nsegs - 1]->p_vaddr + 1111 segs[nsegs - 1]->p_memsz); 1112 mapsize = base_vlimit - base_vaddr; 1113 1114 lf = linker_make_file(filename, &link_elf_class); 1115 if (lf == NULL) { 1116 error = ENOMEM; 1117 goto out; 1118 } 1119 1120 ef = (elf_file_t) lf; 1121 #ifdef SPARSE_MAPPING 1122 ef->object = vm_pager_allocate(OBJT_PHYS, NULL, mapsize, VM_PROT_ALL, 1123 0, thread0.td_ucred); 1124 if (ef->object == NULL) { 1125 error = ENOMEM; 1126 goto out; 1127 } 1128 #ifdef __amd64__ 1129 mapbase = (caddr_t)KERNBASE; 1130 #else 1131 mapbase = (caddr_t)vm_map_min(kernel_map); 1132 #endif 1133 /* 1134 * Mapping protections are downgraded after relocation processing. 1135 */ 1136 error = vm_map_find(kernel_map, ef->object, 0, 1137 (vm_offset_t *)&mapbase, mapsize, 0, VMFS_OPTIMAL_SPACE, 1138 VM_PROT_ALL, VM_PROT_ALL, 0); 1139 if (error != 0) { 1140 vm_object_deallocate(ef->object); 1141 ef->object = NULL; 1142 goto out; 1143 } 1144 #else 1145 mapbase = malloc_exec(mapsize, M_LINKER, M_WAITOK); 1146 #endif 1147 ef->address = mapbase; 1148 1149 /* 1150 * Read the text and data sections and zero the bss. 1151 */ 1152 for (i = 0; i < nsegs; i++) { 1153 segbase = mapbase + segs[i]->p_vaddr - base_vaddr; 1154 1155 #ifdef SPARSE_MAPPING 1156 /* 1157 * Consecutive segments may have different mapping permissions, 1158 * so be strict and verify that their mappings do not overlap. 1159 */ 1160 if (((vm_offset_t)segbase & PAGE_MASK) != 0) { 1161 error = EINVAL; 1162 goto out; 1163 } 1164 1165 error = vm_map_wire(kernel_map, 1166 (vm_offset_t)segbase, 1167 (vm_offset_t)segbase + round_page(segs[i]->p_memsz), 1168 VM_MAP_WIRE_SYSTEM | VM_MAP_WIRE_NOHOLES); 1169 if (error != KERN_SUCCESS) { 1170 error = ENOMEM; 1171 goto out; 1172 } 1173 #endif 1174 1175 error = vn_rdwr(UIO_READ, nd.ni_vp, 1176 segbase, segs[i]->p_filesz, segs[i]->p_offset, 1177 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1178 &resid, td); 1179 if (error != 0) 1180 goto out; 1181 bzero(segbase + segs[i]->p_filesz, 1182 segs[i]->p_memsz - segs[i]->p_filesz); 1183 } 1184 1185 ef->dynamic = (Elf_Dyn *) (mapbase + phdyn->p_vaddr - base_vaddr); 1186 1187 lf->address = ef->address; 1188 lf->size = mapsize; 1189 1190 error = parse_dynamic(ef); 1191 if (error != 0) 1192 goto out; 1193 error = parse_dpcpu(ef); 1194 if (error != 0) 1195 goto out; 1196 #ifdef VIMAGE 1197 error = parse_vnet(ef); 1198 if (error != 0) 1199 goto out; 1200 #endif 1201 link_elf_reloc_local(lf); 1202 1203 VOP_UNLOCK(nd.ni_vp); 1204 error = linker_load_dependencies(lf); 1205 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 1206 if (error != 0) 1207 goto out; 1208 error = relocate_file(ef); 1209 if (error != 0) 1210 goto out; 1211 1212 #ifdef SPARSE_MAPPING 1213 /* 1214 * Downgrade permissions on text segment mappings now that relocation 1215 * processing is complete. Restrict permissions on read-only segments. 1216 */ 1217 for (i = 0; i < nsegs; i++) { 1218 vm_prot_t prot; 1219 1220 if (segs[i]->p_type != PT_LOAD) 1221 continue; 1222 1223 prot = VM_PROT_READ; 1224 if ((segs[i]->p_flags & PF_W) != 0) 1225 prot |= VM_PROT_WRITE; 1226 if ((segs[i]->p_flags & PF_X) != 0) 1227 prot |= VM_PROT_EXECUTE; 1228 segbase = mapbase + segs[i]->p_vaddr - base_vaddr; 1229 error = vm_map_protect(kernel_map, 1230 (vm_offset_t)segbase, 1231 (vm_offset_t)segbase + round_page(segs[i]->p_memsz), 1232 prot, 0, VM_MAP_PROTECT_SET_PROT); 1233 if (error != KERN_SUCCESS) { 1234 error = ENOMEM; 1235 goto out; 1236 } 1237 } 1238 #endif 1239 1240 /* 1241 * Try and load the symbol table if it's present. (you can 1242 * strip it!) 1243 */ 1244 nbytes = hdr->e_shnum * hdr->e_shentsize; 1245 if (nbytes == 0 || hdr->e_shoff == 0) 1246 goto nosyms; 1247 shdr = malloc(nbytes, M_LINKER, M_WAITOK | M_ZERO); 1248 error = vn_rdwr(UIO_READ, nd.ni_vp, 1249 (caddr_t)shdr, nbytes, hdr->e_shoff, 1250 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1251 &resid, td); 1252 if (error != 0) 1253 goto out; 1254 1255 /* Read section string table */ 1256 shstrindex = hdr->e_shstrndx; 1257 if (shstrindex != 0 && shdr[shstrindex].sh_type == SHT_STRTAB && 1258 shdr[shstrindex].sh_size != 0) { 1259 nbytes = shdr[shstrindex].sh_size; 1260 shstrs = malloc(nbytes, M_LINKER, M_WAITOK | M_ZERO); 1261 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shstrs, nbytes, 1262 shdr[shstrindex].sh_offset, UIO_SYSSPACE, IO_NODELOCKED, 1263 td->td_ucred, NOCRED, &resid, td); 1264 if (error) 1265 goto out; 1266 } 1267 1268 symtabindex = -1; 1269 symstrindex = -1; 1270 for (i = 0; i < hdr->e_shnum; i++) { 1271 if (shdr[i].sh_type == SHT_SYMTAB) { 1272 symtabindex = i; 1273 symstrindex = shdr[i].sh_link; 1274 } else if (shstrs != NULL && shdr[i].sh_name != 0 && 1275 strcmp(shstrs + shdr[i].sh_name, ".ctors") == 0) { 1276 /* Record relocated address and size of .ctors. */ 1277 lf->ctors_addr = mapbase + shdr[i].sh_addr - base_vaddr; 1278 lf->ctors_size = shdr[i].sh_size; 1279 } 1280 } 1281 if (symtabindex < 0 || symstrindex < 0) 1282 goto nosyms; 1283 1284 symcnt = shdr[symtabindex].sh_size; 1285 ef->symbase = malloc(symcnt, M_LINKER, M_WAITOK); 1286 strcnt = shdr[symstrindex].sh_size; 1287 ef->strbase = malloc(strcnt, M_LINKER, M_WAITOK); 1288 1289 error = vn_rdwr(UIO_READ, nd.ni_vp, 1290 ef->symbase, symcnt, shdr[symtabindex].sh_offset, 1291 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1292 &resid, td); 1293 if (error != 0) 1294 goto out; 1295 error = vn_rdwr(UIO_READ, nd.ni_vp, 1296 ef->strbase, strcnt, shdr[symstrindex].sh_offset, 1297 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1298 &resid, td); 1299 if (error != 0) 1300 goto out; 1301 1302 ef->ddbsymcnt = symcnt / sizeof(Elf_Sym); 1303 ef->ddbsymtab = (const Elf_Sym *)ef->symbase; 1304 ef->ddbstrcnt = strcnt; 1305 ef->ddbstrtab = ef->strbase; 1306 1307 nosyms: 1308 1309 #ifdef __arm__ 1310 link_elf_locate_exidx(lf, shdr, hdr->e_shnum); 1311 #endif 1312 1313 error = link_elf_link_common_finish(lf); 1314 if (error != 0) 1315 goto out; 1316 1317 *result = lf; 1318 1319 out: 1320 VOP_UNLOCK(nd.ni_vp); 1321 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 1322 if (error != 0 && lf != NULL) 1323 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1324 free(shdr, M_LINKER); 1325 free(firstpage, M_LINKER); 1326 free(shstrs, M_LINKER); 1327 1328 return (error); 1329 } 1330 1331 Elf_Addr 1332 elf_relocaddr(linker_file_t lf, Elf_Addr x) 1333 { 1334 elf_file_t ef; 1335 1336 KASSERT(lf->ops->cls == (kobj_class_t)&link_elf_class, 1337 ("elf_relocaddr: unexpected linker file %p", lf)); 1338 1339 ef = (elf_file_t)lf; 1340 if (x >= ef->pcpu_start && x < ef->pcpu_stop) 1341 return ((x - ef->pcpu_start) + ef->pcpu_base); 1342 #ifdef VIMAGE 1343 if (x >= ef->vnet_start && x < ef->vnet_stop) 1344 return ((x - ef->vnet_start) + ef->vnet_base); 1345 #endif 1346 return (x); 1347 } 1348 1349 static void 1350 link_elf_unload_file(linker_file_t file) 1351 { 1352 elf_file_t ef = (elf_file_t) file; 1353 1354 if (ef->pcpu_base != 0) { 1355 dpcpu_free((void *)ef->pcpu_base, 1356 ef->pcpu_stop - ef->pcpu_start); 1357 elf_set_delete(&set_pcpu_list, ef->pcpu_start); 1358 } 1359 #ifdef VIMAGE 1360 if (ef->vnet_base != 0) { 1361 vnet_data_free((void *)ef->vnet_base, 1362 ef->vnet_stop - ef->vnet_start); 1363 elf_set_delete(&set_vnet_list, ef->vnet_start); 1364 } 1365 #endif 1366 #ifdef GDB 1367 if (ef->gdb.l_ld != NULL) { 1368 GDB_STATE(RT_DELETE); 1369 free((void *)(uintptr_t)ef->gdb.l_name, M_LINKER); 1370 link_elf_delete_gdb(&ef->gdb); 1371 GDB_STATE(RT_CONSISTENT); 1372 } 1373 #endif 1374 1375 /* Notify MD code that a module is being unloaded. */ 1376 elf_cpu_unload_file(file); 1377 1378 if (ef->preloaded) { 1379 link_elf_unload_preload(file); 1380 return; 1381 } 1382 1383 #ifdef SPARSE_MAPPING 1384 if (ef->object != NULL) { 1385 vm_map_remove(kernel_map, (vm_offset_t) ef->address, 1386 (vm_offset_t) ef->address 1387 + (ef->object->size << PAGE_SHIFT)); 1388 } 1389 #else 1390 free(ef->address, M_LINKER); 1391 #endif 1392 free(ef->symbase, M_LINKER); 1393 free(ef->strbase, M_LINKER); 1394 free(ef->ctftab, M_LINKER); 1395 free(ef->ctfoff, M_LINKER); 1396 free(ef->typoff, M_LINKER); 1397 } 1398 1399 static void 1400 link_elf_unload_preload(linker_file_t file) 1401 { 1402 1403 if (file->pathname != NULL) 1404 preload_delete_name(file->pathname); 1405 } 1406 1407 static const char * 1408 symbol_name(elf_file_t ef, Elf_Size r_info) 1409 { 1410 const Elf_Sym *ref; 1411 1412 if (ELF_R_SYM(r_info)) { 1413 ref = ef->symtab + ELF_R_SYM(r_info); 1414 return (ef->strtab + ref->st_name); 1415 } 1416 return (NULL); 1417 } 1418 1419 static int 1420 symbol_type(elf_file_t ef, Elf_Size r_info) 1421 { 1422 const Elf_Sym *ref; 1423 1424 if (ELF_R_SYM(r_info)) { 1425 ref = ef->symtab + ELF_R_SYM(r_info); 1426 return (ELF_ST_TYPE(ref->st_info)); 1427 } 1428 return (STT_NOTYPE); 1429 } 1430 1431 static int 1432 relocate_file1(elf_file_t ef, elf_lookup_fn lookup, elf_reloc_fn reloc, 1433 bool ifuncs) 1434 { 1435 const Elf_Rel *rel; 1436 const Elf_Rela *rela; 1437 const char *symname; 1438 1439 TSENTER(); 1440 #define APPLY_RELOCS(iter, tbl, tblsize, type) do { \ 1441 for ((iter) = (tbl); (iter) != NULL && \ 1442 (iter) < (tbl) + (tblsize) / sizeof(*(iter)); (iter)++) { \ 1443 if ((symbol_type(ef, (iter)->r_info) == \ 1444 STT_GNU_IFUNC || \ 1445 elf_is_ifunc_reloc((iter)->r_info)) != ifuncs) \ 1446 continue; \ 1447 if (reloc(&ef->lf, (Elf_Addr)ef->address, \ 1448 (iter), (type), lookup)) { \ 1449 symname = symbol_name(ef, (iter)->r_info); \ 1450 printf("link_elf: symbol %s undefined\n", \ 1451 symname); \ 1452 return (ENOENT); \ 1453 } \ 1454 } \ 1455 } while (0) 1456 1457 APPLY_RELOCS(rel, ef->rel, ef->relsize, ELF_RELOC_REL); 1458 TSENTER2("ef->rela"); 1459 APPLY_RELOCS(rela, ef->rela, ef->relasize, ELF_RELOC_RELA); 1460 TSEXIT2("ef->rela"); 1461 APPLY_RELOCS(rel, ef->pltrel, ef->pltrelsize, ELF_RELOC_REL); 1462 APPLY_RELOCS(rela, ef->pltrela, ef->pltrelasize, ELF_RELOC_RELA); 1463 1464 #undef APPLY_RELOCS 1465 1466 TSEXIT(); 1467 return (0); 1468 } 1469 1470 static int 1471 relocate_file(elf_file_t ef) 1472 { 1473 int error; 1474 1475 error = relocate_file1(ef, elf_lookup, elf_reloc, false); 1476 if (error == 0) 1477 error = relocate_file1(ef, elf_lookup, elf_reloc, true); 1478 return (error); 1479 } 1480 1481 /* 1482 * SysV hash function for symbol table lookup. It is specified by the 1483 * System V ABI. 1484 */ 1485 static Elf32_Word 1486 elf_hash(const char *name) 1487 { 1488 const unsigned char *p = (const unsigned char *)name; 1489 Elf32_Word h = 0; 1490 1491 while (*p != '\0') { 1492 h = (h << 4) + *p++; 1493 h ^= (h >> 24) & 0xf0; 1494 } 1495 return (h & 0x0fffffff); 1496 } 1497 1498 static int 1499 link_elf_lookup_symbol1(linker_file_t lf, const char *name, c_linker_sym_t *sym, 1500 bool see_local) 1501 { 1502 elf_file_t ef = (elf_file_t) lf; 1503 unsigned long symnum; 1504 const Elf_Sym* symp; 1505 const char *strp; 1506 Elf32_Word hash; 1507 1508 /* If we don't have a hash, bail. */ 1509 if (ef->buckets == NULL || ef->nbuckets == 0) { 1510 printf("link_elf_lookup_symbol: missing symbol hash table\n"); 1511 return (ENOENT); 1512 } 1513 1514 /* First, search hashed global symbols */ 1515 hash = elf_hash(name); 1516 symnum = ef->buckets[hash % ef->nbuckets]; 1517 1518 while (symnum != STN_UNDEF) { 1519 if (symnum >= ef->nchains) { 1520 printf("%s: corrupt symbol table\n", __func__); 1521 return (ENOENT); 1522 } 1523 1524 symp = ef->symtab + symnum; 1525 if (symp->st_name == 0) { 1526 printf("%s: corrupt symbol table\n", __func__); 1527 return (ENOENT); 1528 } 1529 1530 strp = ef->strtab + symp->st_name; 1531 1532 if (strcmp(name, strp) == 0) { 1533 if (symp->st_shndx != SHN_UNDEF || 1534 (symp->st_value != 0 && 1535 (ELF_ST_TYPE(symp->st_info) == STT_FUNC || 1536 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC))) { 1537 if (see_local || 1538 ELF_ST_BIND(symp->st_info) != STB_LOCAL) { 1539 *sym = (c_linker_sym_t) symp; 1540 return (0); 1541 } 1542 } 1543 return (ENOENT); 1544 } 1545 1546 symnum = ef->chains[symnum]; 1547 } 1548 1549 return (ENOENT); 1550 } 1551 1552 static int 1553 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym) 1554 { 1555 if (link_elf_leak_locals) 1556 return (link_elf_lookup_debug_symbol(lf, name, sym)); 1557 return (link_elf_lookup_symbol1(lf, name, sym, false)); 1558 } 1559 1560 static int 1561 link_elf_lookup_debug_symbol(linker_file_t lf, const char *name, 1562 c_linker_sym_t *sym) 1563 { 1564 elf_file_t ef = (elf_file_t)lf; 1565 const Elf_Sym* symp; 1566 const char *strp; 1567 int i; 1568 1569 if (link_elf_lookup_symbol1(lf, name, sym, true) == 0) 1570 return (0); 1571 1572 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1573 strp = ef->ddbstrtab + symp->st_name; 1574 if (strcmp(name, strp) == 0) { 1575 if (symp->st_shndx != SHN_UNDEF || 1576 (symp->st_value != 0 && 1577 (ELF_ST_TYPE(symp->st_info) == STT_FUNC || 1578 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC))) { 1579 *sym = (c_linker_sym_t) symp; 1580 return (0); 1581 } 1582 return (ENOENT); 1583 } 1584 } 1585 1586 return (ENOENT); 1587 } 1588 1589 static int 1590 link_elf_symbol_values1(linker_file_t lf, c_linker_sym_t sym, 1591 linker_symval_t *symval, bool see_local) 1592 { 1593 elf_file_t ef; 1594 const Elf_Sym *es; 1595 caddr_t val; 1596 1597 ef = (elf_file_t)lf; 1598 es = (const Elf_Sym *)sym; 1599 if (es >= ef->symtab && es < ef->symtab + ef->nchains) { 1600 if (!see_local && ELF_ST_BIND(es->st_info) == STB_LOCAL) 1601 return (ENOENT); 1602 symval->name = ef->strtab + es->st_name; 1603 val = (caddr_t)ef->address + es->st_value; 1604 if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC) 1605 val = ((caddr_t (*)(void))val)(); 1606 symval->value = val; 1607 symval->size = es->st_size; 1608 return (0); 1609 } 1610 return (ENOENT); 1611 } 1612 1613 static int 1614 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym, 1615 linker_symval_t *symval) 1616 { 1617 if (link_elf_leak_locals) 1618 return (link_elf_debug_symbol_values(lf, sym, symval)); 1619 return (link_elf_symbol_values1(lf, sym, symval, false)); 1620 } 1621 1622 static int 1623 link_elf_debug_symbol_values(linker_file_t lf, c_linker_sym_t sym, 1624 linker_symval_t *symval) 1625 { 1626 elf_file_t ef = (elf_file_t)lf; 1627 const Elf_Sym *es = (const Elf_Sym *)sym; 1628 caddr_t val; 1629 1630 if (link_elf_symbol_values1(lf, sym, symval, true) == 0) 1631 return (0); 1632 if (ef->symtab == ef->ddbsymtab) 1633 return (ENOENT); 1634 1635 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) { 1636 symval->name = ef->ddbstrtab + es->st_name; 1637 val = (caddr_t)ef->address + es->st_value; 1638 if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC) 1639 val = ((caddr_t (*)(void))val)(); 1640 symval->value = val; 1641 symval->size = es->st_size; 1642 return (0); 1643 } 1644 return (ENOENT); 1645 } 1646 1647 static int 1648 link_elf_search_symbol(linker_file_t lf, caddr_t value, 1649 c_linker_sym_t *sym, long *diffp) 1650 { 1651 elf_file_t ef = (elf_file_t)lf; 1652 u_long off = (uintptr_t)(void *)value; 1653 u_long diff = off; 1654 u_long st_value; 1655 const Elf_Sym *es; 1656 const Elf_Sym *best = NULL; 1657 int i; 1658 1659 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) { 1660 if (es->st_name == 0) 1661 continue; 1662 st_value = es->st_value + (uintptr_t) (void *) ef->address; 1663 if (off >= st_value) { 1664 if (off - st_value < diff) { 1665 diff = off - st_value; 1666 best = es; 1667 if (diff == 0) 1668 break; 1669 } else if (off - st_value == diff) { 1670 best = es; 1671 } 1672 } 1673 } 1674 if (best == NULL) 1675 *diffp = off; 1676 else 1677 *diffp = diff; 1678 *sym = (c_linker_sym_t) best; 1679 1680 return (0); 1681 } 1682 1683 /* 1684 * Look up a linker set on an ELF system. 1685 */ 1686 static int 1687 link_elf_lookup_set(linker_file_t lf, const char *name, 1688 void ***startp, void ***stopp, int *countp) 1689 { 1690 c_linker_sym_t sym; 1691 linker_symval_t symval; 1692 char *setsym; 1693 void **start, **stop; 1694 int len, error = 0, count; 1695 1696 len = strlen(name) + sizeof("__start_set_"); /* sizeof includes \0 */ 1697 setsym = malloc(len, M_LINKER, M_WAITOK); 1698 1699 /* get address of first entry */ 1700 snprintf(setsym, len, "%s%s", "__start_set_", name); 1701 error = link_elf_lookup_symbol(lf, setsym, &sym); 1702 if (error != 0) 1703 goto out; 1704 link_elf_symbol_values(lf, sym, &symval); 1705 if (symval.value == 0) { 1706 error = ESRCH; 1707 goto out; 1708 } 1709 start = (void **)symval.value; 1710 1711 /* get address of last entry */ 1712 snprintf(setsym, len, "%s%s", "__stop_set_", name); 1713 error = link_elf_lookup_symbol(lf, setsym, &sym); 1714 if (error != 0) 1715 goto out; 1716 link_elf_symbol_values(lf, sym, &symval); 1717 if (symval.value == 0) { 1718 error = ESRCH; 1719 goto out; 1720 } 1721 stop = (void **)symval.value; 1722 1723 /* and the number of entries */ 1724 count = stop - start; 1725 1726 /* and copy out */ 1727 if (startp != NULL) 1728 *startp = start; 1729 if (stopp != NULL) 1730 *stopp = stop; 1731 if (countp != NULL) 1732 *countp = count; 1733 1734 out: 1735 free(setsym, M_LINKER); 1736 return (error); 1737 } 1738 1739 static int 1740 link_elf_each_function_name(linker_file_t file, 1741 int (*callback)(const char *, void *), void *opaque) 1742 { 1743 elf_file_t ef = (elf_file_t)file; 1744 const Elf_Sym *symp; 1745 int i, error; 1746 1747 /* Exhaustive search */ 1748 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1749 if (symp->st_value != 0 && 1750 (ELF_ST_TYPE(symp->st_info) == STT_FUNC || 1751 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) { 1752 error = callback(ef->ddbstrtab + symp->st_name, opaque); 1753 if (error != 0) 1754 return (error); 1755 } 1756 } 1757 return (0); 1758 } 1759 1760 static int 1761 link_elf_each_function_nameval(linker_file_t file, 1762 linker_function_nameval_callback_t callback, void *opaque) 1763 { 1764 linker_symval_t symval; 1765 elf_file_t ef = (elf_file_t)file; 1766 const Elf_Sym *symp; 1767 int i, error; 1768 1769 /* Exhaustive search */ 1770 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1771 if (symp->st_value != 0 && 1772 (ELF_ST_TYPE(symp->st_info) == STT_FUNC || 1773 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) { 1774 error = link_elf_debug_symbol_values(file, 1775 (c_linker_sym_t) symp, &symval); 1776 if (error == 0) 1777 error = callback(file, i, &symval, opaque); 1778 if (error != 0) 1779 return (error); 1780 } 1781 } 1782 return (0); 1783 } 1784 1785 const Elf_Sym * 1786 elf_get_sym(linker_file_t lf, Elf_Size symidx) 1787 { 1788 elf_file_t ef = (elf_file_t)lf; 1789 1790 if (symidx >= ef->nchains) 1791 return (NULL); 1792 return (ef->symtab + symidx); 1793 } 1794 1795 const char * 1796 elf_get_symname(linker_file_t lf, Elf_Size symidx) 1797 { 1798 elf_file_t ef = (elf_file_t)lf; 1799 const Elf_Sym *sym; 1800 1801 if (symidx >= ef->nchains) 1802 return (NULL); 1803 sym = ef->symtab + symidx; 1804 return (ef->strtab + sym->st_name); 1805 } 1806 1807 /* 1808 * Symbol lookup function that can be used when the symbol index is known (ie 1809 * in relocations). It uses the symbol index instead of doing a fully fledged 1810 * hash table based lookup when such is valid. For example for local symbols. 1811 * This is not only more efficient, it's also more correct. It's not always 1812 * the case that the symbol can be found through the hash table. 1813 */ 1814 static int 1815 elf_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *res) 1816 { 1817 elf_file_t ef = (elf_file_t)lf; 1818 const Elf_Sym *sym; 1819 const char *symbol; 1820 Elf_Addr addr, start, base; 1821 1822 /* Don't even try to lookup the symbol if the index is bogus. */ 1823 if (symidx >= ef->nchains) { 1824 *res = 0; 1825 return (EINVAL); 1826 } 1827 1828 sym = ef->symtab + symidx; 1829 1830 /* 1831 * Don't do a full lookup when the symbol is local. It may even 1832 * fail because it may not be found through the hash table. 1833 */ 1834 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) { 1835 /* Force lookup failure when we have an insanity. */ 1836 if (sym->st_shndx == SHN_UNDEF || sym->st_value == 0) { 1837 *res = 0; 1838 return (EINVAL); 1839 } 1840 *res = ((Elf_Addr)ef->address + sym->st_value); 1841 return (0); 1842 } 1843 1844 /* 1845 * XXX we can avoid doing a hash table based lookup for global 1846 * symbols as well. This however is not always valid, so we'll 1847 * just do it the hard way for now. Performance tweaks can 1848 * always be added. 1849 */ 1850 1851 symbol = ef->strtab + sym->st_name; 1852 1853 /* Force a lookup failure if the symbol name is bogus. */ 1854 if (*symbol == 0) { 1855 *res = 0; 1856 return (EINVAL); 1857 } 1858 1859 addr = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps)); 1860 if (addr == 0 && ELF_ST_BIND(sym->st_info) != STB_WEAK) { 1861 *res = 0; 1862 return (EINVAL); 1863 } 1864 1865 if (elf_set_find(&set_pcpu_list, addr, &start, &base)) 1866 addr = addr - start + base; 1867 #ifdef VIMAGE 1868 else if (elf_set_find(&set_vnet_list, addr, &start, &base)) 1869 addr = addr - start + base; 1870 #endif 1871 *res = addr; 1872 return (0); 1873 } 1874 1875 static void 1876 link_elf_reloc_local(linker_file_t lf) 1877 { 1878 const Elf_Rel *rellim; 1879 const Elf_Rel *rel; 1880 const Elf_Rela *relalim; 1881 const Elf_Rela *rela; 1882 elf_file_t ef = (elf_file_t)lf; 1883 1884 /* Perform relocations without addend if there are any: */ 1885 if ((rel = ef->rel) != NULL) { 1886 rellim = (const Elf_Rel *)((const char *)ef->rel + ef->relsize); 1887 while (rel < rellim) { 1888 elf_reloc_local(lf, (Elf_Addr)ef->address, rel, 1889 ELF_RELOC_REL, elf_lookup); 1890 rel++; 1891 } 1892 } 1893 1894 /* Perform relocations with addend if there are any: */ 1895 if ((rela = ef->rela) != NULL) { 1896 relalim = (const Elf_Rela *) 1897 ((const char *)ef->rela + ef->relasize); 1898 while (rela < relalim) { 1899 elf_reloc_local(lf, (Elf_Addr)ef->address, rela, 1900 ELF_RELOC_RELA, elf_lookup); 1901 rela++; 1902 } 1903 } 1904 } 1905 1906 static long 1907 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab) 1908 { 1909 elf_file_t ef = (elf_file_t)lf; 1910 1911 *symtab = ef->ddbsymtab; 1912 1913 if (*symtab == NULL) 1914 return (0); 1915 1916 return (ef->ddbsymcnt); 1917 } 1918 1919 static long 1920 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab) 1921 { 1922 elf_file_t ef = (elf_file_t)lf; 1923 1924 *strtab = ef->ddbstrtab; 1925 1926 if (*strtab == NULL) 1927 return (0); 1928 1929 return (ef->ddbstrcnt); 1930 } 1931 1932 #ifdef VIMAGE 1933 static void 1934 link_elf_propagate_vnets(linker_file_t lf) 1935 { 1936 elf_file_t ef = (elf_file_t)lf; 1937 int size; 1938 1939 if (ef->vnet_base != 0) { 1940 size = (uintptr_t)ef->vnet_stop - (uintptr_t)ef->vnet_start; 1941 vnet_data_copy((void *)ef->vnet_base, size); 1942 } 1943 } 1944 #endif 1945 1946 #if defined(__i386__) || defined(__amd64__) || defined(__aarch64__) || defined(__powerpc__) 1947 /* 1948 * Use this lookup routine when performing relocations early during boot. 1949 * The generic lookup routine depends on kobj, which is not initialized 1950 * at that point. 1951 */ 1952 static int 1953 elf_lookup_ifunc(linker_file_t lf, Elf_Size symidx, int deps __unused, 1954 Elf_Addr *res) 1955 { 1956 elf_file_t ef; 1957 const Elf_Sym *symp; 1958 caddr_t val; 1959 1960 ef = (elf_file_t)lf; 1961 symp = ef->symtab + symidx; 1962 if (ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC) { 1963 val = (caddr_t)ef->address + symp->st_value; 1964 *res = ((Elf_Addr (*)(void))val)(); 1965 return (0); 1966 } 1967 return (ENOENT); 1968 } 1969 1970 void 1971 link_elf_ireloc(caddr_t kmdp) 1972 { 1973 struct elf_file eff; 1974 elf_file_t ef; 1975 1976 TSENTER(); 1977 ef = &eff; 1978 1979 bzero_early(ef, sizeof(*ef)); 1980 1981 ef->modptr = kmdp; 1982 ef->dynamic = (Elf_Dyn *)&_DYNAMIC; 1983 1984 #ifdef RELOCATABLE_KERNEL 1985 ef->address = (caddr_t) (__startkernel - KERNBASE); 1986 #else 1987 ef->address = 0; 1988 #endif 1989 parse_dynamic(ef); 1990 1991 link_elf_preload_parse_symbols(ef); 1992 relocate_file1(ef, elf_lookup_ifunc, elf_reloc, true); 1993 TSEXIT(); 1994 } 1995 1996 #if defined(__aarch64__) || defined(__amd64__) 1997 void 1998 link_elf_late_ireloc(void) 1999 { 2000 elf_file_t ef; 2001 2002 KASSERT(linker_kernel_file != NULL, 2003 ("link_elf_late_ireloc: No kernel linker file found")); 2004 ef = (elf_file_t)linker_kernel_file; 2005 2006 relocate_file1(ef, elf_lookup_ifunc, elf_reloc_late, true); 2007 } 2008 #endif 2009 #endif 2010