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 "opt_ddb.h" 30 #include "opt_gdb.h" 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/lock.h> 36 #include <sys/malloc.h> 37 #ifdef SPARSE_MAPPING 38 #include <sys/mman.h> 39 #endif 40 #include <sys/mutex.h> 41 #include <sys/mount.h> 42 #include <sys/pcpu.h> 43 #include <sys/proc.h> 44 #include <sys/namei.h> 45 #include <sys/fcntl.h> 46 #include <sys/vnode.h> 47 #include <sys/linker.h> 48 #include <sys/sysctl.h> 49 #include <sys/tslog.h> 50 51 #include <machine/elf.h> 52 53 #include <net/vnet.h> 54 55 #include <security/mac/mac_framework.h> 56 57 #include <vm/vm.h> 58 #include <vm/vm_param.h> 59 #ifdef SPARSE_MAPPING 60 #include <vm/vm_object.h> 61 #include <vm/vm_kern.h> 62 #include <vm/vm_extern.h> 63 #endif 64 #include <vm/pmap.h> 65 #include <vm/vm_map.h> 66 67 #include <sys/link_elf.h> 68 69 #include "linker_if.h" 70 71 #define MAXSEGS 4 72 73 typedef struct elf_file { 74 struct linker_file lf; /* Common fields */ 75 int preloaded; /* Was file pre-loaded */ 76 caddr_t address; /* Relocation address */ 77 #ifdef SPARSE_MAPPING 78 vm_object_t object; /* VM object to hold file pages */ 79 #endif 80 Elf_Dyn *dynamic; /* Symbol table etc. */ 81 Elf_Hashelt nbuckets; /* DT_HASH info */ 82 Elf_Hashelt nchains; 83 const Elf_Hashelt *buckets; 84 const Elf_Hashelt *chains; 85 caddr_t hash; 86 caddr_t strtab; /* DT_STRTAB */ 87 int strsz; /* DT_STRSZ */ 88 const Elf_Sym *symtab; /* DT_SYMTAB */ 89 Elf_Addr *got; /* DT_PLTGOT */ 90 const Elf_Rel *pltrel; /* DT_JMPREL */ 91 int pltrelsize; /* DT_PLTRELSZ */ 92 const Elf_Rela *pltrela; /* DT_JMPREL */ 93 int pltrelasize; /* DT_PLTRELSZ */ 94 const Elf_Rel *rel; /* DT_REL */ 95 int relsize; /* DT_RELSZ */ 96 const Elf_Rela *rela; /* DT_RELA */ 97 int relasize; /* DT_RELASZ */ 98 caddr_t modptr; 99 const Elf_Sym *ddbsymtab; /* The symbol table we are using */ 100 long ddbsymcnt; /* Number of symbols */ 101 caddr_t ddbstrtab; /* String table */ 102 long ddbstrcnt; /* number of bytes in string table */ 103 caddr_t symbase; /* malloc'ed symbold base */ 104 caddr_t strbase; /* malloc'ed string base */ 105 caddr_t ctftab; /* CTF table */ 106 long ctfcnt; /* number of bytes in CTF table */ 107 caddr_t ctfoff; /* CTF offset table */ 108 caddr_t typoff; /* Type offset table */ 109 long typlen; /* Number of type entries. */ 110 Elf_Addr pcpu_start; /* Pre-relocation pcpu set start. */ 111 Elf_Addr pcpu_stop; /* Pre-relocation pcpu set stop. */ 112 Elf_Addr pcpu_base; /* Relocated pcpu set address. */ 113 #ifdef VIMAGE 114 Elf_Addr vnet_start; /* Pre-relocation vnet set start. */ 115 Elf_Addr vnet_stop; /* Pre-relocation vnet set stop. */ 116 Elf_Addr vnet_base; /* Relocated vnet set address. */ 117 #endif 118 #ifdef GDB 119 struct link_map gdb; /* hooks for gdb */ 120 #endif 121 } *elf_file_t; 122 123 struct elf_set { 124 Elf_Addr es_start; 125 Elf_Addr es_stop; 126 Elf_Addr es_base; 127 TAILQ_ENTRY(elf_set) es_link; 128 }; 129 130 TAILQ_HEAD(elf_set_head, elf_set); 131 132 #include <kern/kern_ctf.c> 133 134 static int link_elf_link_common_finish(linker_file_t); 135 static int link_elf_link_preload(linker_class_t cls, 136 const char *, linker_file_t *); 137 static int link_elf_link_preload_finish(linker_file_t); 138 static int link_elf_load_file(linker_class_t, const char *, 139 linker_file_t *); 140 static int link_elf_lookup_symbol(linker_file_t, const char *, 141 c_linker_sym_t *); 142 static int link_elf_lookup_debug_symbol(linker_file_t, const char *, 143 c_linker_sym_t *); 144 static int link_elf_symbol_values(linker_file_t, c_linker_sym_t, 145 linker_symval_t *); 146 static int link_elf_debug_symbol_values(linker_file_t, c_linker_sym_t, 147 linker_symval_t*); 148 static int link_elf_search_symbol(linker_file_t, caddr_t, 149 c_linker_sym_t *, long *); 150 151 static void link_elf_unload_file(linker_file_t); 152 static void link_elf_unload_preload(linker_file_t); 153 static int link_elf_lookup_set(linker_file_t, const char *, 154 void ***, void ***, int *); 155 static int link_elf_each_function_name(linker_file_t, 156 int (*)(const char *, void *), void *); 157 static int link_elf_each_function_nameval(linker_file_t, 158 linker_function_nameval_callback_t, void *); 159 static void link_elf_reloc_local(linker_file_t); 160 static long link_elf_symtab_get(linker_file_t, const Elf_Sym **); 161 static long link_elf_strtab_get(linker_file_t, caddr_t *); 162 #ifdef VIMAGE 163 static void link_elf_propagate_vnets(linker_file_t); 164 #endif 165 static int elf_lookup(linker_file_t, Elf_Size, int, Elf_Addr *); 166 167 static kobj_method_t link_elf_methods[] = { 168 KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol), 169 KOBJMETHOD(linker_lookup_debug_symbol, link_elf_lookup_debug_symbol), 170 KOBJMETHOD(linker_symbol_values, link_elf_symbol_values), 171 KOBJMETHOD(linker_debug_symbol_values, link_elf_debug_symbol_values), 172 KOBJMETHOD(linker_search_symbol, link_elf_search_symbol), 173 KOBJMETHOD(linker_unload, link_elf_unload_file), 174 KOBJMETHOD(linker_load_file, link_elf_load_file), 175 KOBJMETHOD(linker_link_preload, link_elf_link_preload), 176 KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish), 177 KOBJMETHOD(linker_lookup_set, link_elf_lookup_set), 178 KOBJMETHOD(linker_each_function_name, link_elf_each_function_name), 179 KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval), 180 KOBJMETHOD(linker_ctf_get, link_elf_ctf_get), 181 KOBJMETHOD(linker_symtab_get, link_elf_symtab_get), 182 KOBJMETHOD(linker_strtab_get, link_elf_strtab_get), 183 #ifdef VIMAGE 184 KOBJMETHOD(linker_propagate_vnets, link_elf_propagate_vnets), 185 #endif 186 KOBJMETHOD_END 187 }; 188 189 static struct linker_class link_elf_class = { 190 #if ELF_TARG_CLASS == ELFCLASS32 191 "elf32", 192 #else 193 "elf64", 194 #endif 195 link_elf_methods, sizeof(struct elf_file) 196 }; 197 198 static bool link_elf_leak_locals = true; 199 SYSCTL_BOOL(_debug, OID_AUTO, link_elf_leak_locals, 200 CTLFLAG_RWTUN, &link_elf_leak_locals, 0, 201 "Allow local symbols to participate in global module symbol resolution"); 202 203 typedef int (*elf_reloc_fn)(linker_file_t lf, Elf_Addr relocbase, 204 const void *data, int type, elf_lookup_fn lookup); 205 206 static int parse_dynamic(elf_file_t); 207 static int relocate_file(elf_file_t); 208 static int relocate_file1(elf_file_t ef, elf_lookup_fn lookup, 209 elf_reloc_fn reloc, bool ifuncs); 210 static int link_elf_preload_parse_symbols(elf_file_t); 211 212 static struct elf_set_head set_pcpu_list; 213 #ifdef VIMAGE 214 static struct elf_set_head set_vnet_list; 215 #endif 216 217 static void 218 elf_set_add(struct elf_set_head *list, Elf_Addr start, Elf_Addr stop, Elf_Addr base) 219 { 220 struct elf_set *set, *iter; 221 222 set = malloc(sizeof(*set), M_LINKER, M_WAITOK); 223 set->es_start = start; 224 set->es_stop = stop; 225 set->es_base = base; 226 227 TAILQ_FOREACH(iter, list, es_link) { 228 KASSERT((set->es_start < iter->es_start && set->es_stop < iter->es_stop) || 229 (set->es_start > iter->es_start && set->es_stop > iter->es_stop), 230 ("linker sets intersection: to insert: 0x%jx-0x%jx; inserted: 0x%jx-0x%jx", 231 (uintmax_t)set->es_start, (uintmax_t)set->es_stop, 232 (uintmax_t)iter->es_start, (uintmax_t)iter->es_stop)); 233 234 if (iter->es_start > set->es_start) { 235 TAILQ_INSERT_BEFORE(iter, set, es_link); 236 break; 237 } 238 } 239 240 if (iter == NULL) 241 TAILQ_INSERT_TAIL(list, set, es_link); 242 } 243 244 static int 245 elf_set_find(struct elf_set_head *list, Elf_Addr addr, Elf_Addr *start, Elf_Addr *base) 246 { 247 struct elf_set *set; 248 249 TAILQ_FOREACH(set, list, es_link) { 250 if (addr < set->es_start) 251 return (0); 252 if (addr < set->es_stop) { 253 *start = set->es_start; 254 *base = set->es_base; 255 return (1); 256 } 257 } 258 259 return (0); 260 } 261 262 static void 263 elf_set_delete(struct elf_set_head *list, Elf_Addr start) 264 { 265 struct elf_set *set; 266 267 TAILQ_FOREACH(set, list, es_link) { 268 if (start < set->es_start) 269 break; 270 if (start == set->es_start) { 271 TAILQ_REMOVE(list, set, es_link); 272 free(set, M_LINKER); 273 return; 274 } 275 } 276 KASSERT(0, ("deleting unknown linker set (start = 0x%jx)", 277 (uintmax_t)start)); 278 } 279 280 #ifdef GDB 281 static void r_debug_state(struct r_debug *, struct link_map *); 282 283 /* 284 * A list of loaded modules for GDB to use for loading symbols. 285 */ 286 struct r_debug r_debug; 287 288 #define GDB_STATE(s) do { \ 289 r_debug.r_state = s; r_debug_state(NULL, NULL); \ 290 } while (0) 291 292 /* 293 * Function for the debugger to set a breakpoint on to gain control. 294 */ 295 static void 296 r_debug_state(struct r_debug *dummy_one __unused, 297 struct link_map *dummy_two __unused) 298 { 299 } 300 301 static void 302 link_elf_add_gdb(struct link_map *l) 303 { 304 struct link_map *prev; 305 306 l->l_next = NULL; 307 308 if (r_debug.r_map == NULL) { 309 /* Add first. */ 310 l->l_prev = NULL; 311 r_debug.r_map = l; 312 } else { 313 /* Append to list. */ 314 for (prev = r_debug.r_map; 315 prev->l_next != NULL; 316 prev = prev->l_next) 317 ; 318 l->l_prev = prev; 319 prev->l_next = l; 320 } 321 } 322 323 static void 324 link_elf_delete_gdb(struct link_map *l) 325 { 326 if (l->l_prev == NULL) { 327 /* Remove first. */ 328 if ((r_debug.r_map = l->l_next) != NULL) 329 l->l_next->l_prev = NULL; 330 } else { 331 /* Remove any but first. */ 332 if ((l->l_prev->l_next = l->l_next) != NULL) 333 l->l_next->l_prev = l->l_prev; 334 } 335 } 336 #endif /* GDB */ 337 338 /* 339 * The kernel symbol table starts here. 340 */ 341 extern struct _dynamic _DYNAMIC; 342 343 static void 344 link_elf_error(const char *filename, const char *s) 345 { 346 if (filename == NULL) 347 printf("kldload: %s\n", s); 348 else 349 printf("kldload: %s: %s\n", filename, s); 350 } 351 352 static void 353 link_elf_invoke_ctors(caddr_t addr, size_t size) 354 { 355 void (**ctor)(void); 356 size_t i, cnt; 357 358 if (addr == NULL || size == 0) 359 return; 360 cnt = size / sizeof(*ctor); 361 ctor = (void *)addr; 362 for (i = 0; i < cnt; i++) { 363 if (ctor[i] != NULL) 364 (*ctor[i])(); 365 } 366 } 367 368 /* 369 * Actions performed after linking/loading both the preloaded kernel and any 370 * modules; whether preloaded or dynamicly loaded. 371 */ 372 static int 373 link_elf_link_common_finish(linker_file_t lf) 374 { 375 #ifdef GDB 376 elf_file_t ef = (elf_file_t)lf; 377 char *newfilename; 378 #endif 379 int error; 380 381 /* Notify MD code that a module is being loaded. */ 382 error = elf_cpu_load_file(lf); 383 if (error != 0) 384 return (error); 385 386 #ifdef GDB 387 GDB_STATE(RT_ADD); 388 ef->gdb.l_addr = lf->address; 389 newfilename = malloc(strlen(lf->filename) + 1, M_LINKER, M_WAITOK); 390 strcpy(newfilename, lf->filename); 391 ef->gdb.l_name = newfilename; 392 ef->gdb.l_ld = ef->dynamic; 393 link_elf_add_gdb(&ef->gdb); 394 GDB_STATE(RT_CONSISTENT); 395 #endif 396 397 /* Invoke .ctors */ 398 link_elf_invoke_ctors(lf->ctors_addr, lf->ctors_size); 399 return (0); 400 } 401 402 #ifdef RELOCATABLE_KERNEL 403 /* 404 * __startkernel and __endkernel are symbols set up as relocation canaries. 405 * 406 * They are defined in locore to reference linker script symbols at the 407 * beginning and end of the LOAD area. This has the desired side effect of 408 * giving us variables that have relative relocations pointing at them, so 409 * relocation of the kernel object will cause the variables to be updated 410 * automatically by the runtime linker when we initialize. 411 * 412 * There are two main reasons to relocate the kernel: 413 * 1) If the loader needed to load the kernel at an alternate load address. 414 * 2) If the kernel is switching address spaces on machines like POWER9 415 * under Radix where the high bits of the effective address are used to 416 * differentiate between hypervisor, host, guest, and problem state. 417 */ 418 extern vm_offset_t __startkernel, __endkernel; 419 #endif 420 421 static unsigned long kern_relbase = KERNBASE; 422 423 SYSCTL_ULONG(_kern, OID_AUTO, base_address, CTLFLAG_RD, 424 SYSCTL_NULL_ULONG_PTR, KERNBASE, "Kernel base address"); 425 SYSCTL_ULONG(_kern, OID_AUTO, relbase_address, CTLFLAG_RD, 426 &kern_relbase, 0, "Kernel relocated base address"); 427 428 static void 429 link_elf_init(void* arg) 430 { 431 Elf_Dyn *dp; 432 Elf_Addr *ctors_addrp; 433 Elf_Size *ctors_sizep; 434 caddr_t modptr, baseptr, sizeptr; 435 elf_file_t ef; 436 const char *modname; 437 438 linker_add_class(&link_elf_class); 439 440 dp = (Elf_Dyn *)&_DYNAMIC; 441 modname = NULL; 442 modptr = preload_search_by_type("elf" __XSTRING(__ELF_WORD_SIZE) " kernel"); 443 if (modptr == NULL) 444 modptr = preload_search_by_type("elf kernel"); 445 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 446 if (modname == NULL) 447 modname = "kernel"; 448 linker_kernel_file = linker_make_file(modname, &link_elf_class); 449 if (linker_kernel_file == NULL) 450 panic("%s: Can't create linker structures for kernel", 451 __func__); 452 453 ef = (elf_file_t) linker_kernel_file; 454 ef->preloaded = 1; 455 #ifdef RELOCATABLE_KERNEL 456 /* Compute relative displacement */ 457 ef->address = (caddr_t) (__startkernel - KERNBASE); 458 #else 459 ef->address = 0; 460 #endif 461 #ifdef SPARSE_MAPPING 462 ef->object = NULL; 463 #endif 464 ef->dynamic = dp; 465 466 if (dp != NULL) 467 parse_dynamic(ef); 468 #ifdef RELOCATABLE_KERNEL 469 linker_kernel_file->address = (caddr_t)__startkernel; 470 linker_kernel_file->size = (intptr_t)(__endkernel - __startkernel); 471 kern_relbase = (unsigned long)__startkernel; 472 #else 473 linker_kernel_file->address += KERNBASE; 474 linker_kernel_file->size = -(intptr_t)linker_kernel_file->address; 475 #endif 476 477 if (modptr != NULL) { 478 ef->modptr = modptr; 479 baseptr = preload_search_info(modptr, MODINFO_ADDR); 480 if (baseptr != NULL) 481 linker_kernel_file->address = *(caddr_t *)baseptr; 482 sizeptr = preload_search_info(modptr, MODINFO_SIZE); 483 if (sizeptr != NULL) 484 linker_kernel_file->size = *(size_t *)sizeptr; 485 ctors_addrp = (Elf_Addr *)preload_search_info(modptr, 486 MODINFO_METADATA | MODINFOMD_CTORS_ADDR); 487 ctors_sizep = (Elf_Size *)preload_search_info(modptr, 488 MODINFO_METADATA | MODINFOMD_CTORS_SIZE); 489 if (ctors_addrp != NULL && ctors_sizep != NULL) { 490 linker_kernel_file->ctors_addr = ef->address + 491 *ctors_addrp; 492 linker_kernel_file->ctors_size = *ctors_sizep; 493 } 494 } 495 (void)link_elf_preload_parse_symbols(ef); 496 497 #ifdef GDB 498 r_debug.r_map = NULL; 499 r_debug.r_brk = r_debug_state; 500 r_debug.r_state = RT_CONSISTENT; 501 #endif 502 503 (void)link_elf_link_common_finish(linker_kernel_file); 504 linker_kernel_file->flags |= LINKER_FILE_LINKED; 505 TAILQ_INIT(&set_pcpu_list); 506 #ifdef VIMAGE 507 TAILQ_INIT(&set_vnet_list); 508 vnet_save_init((void *)VNET_START, VNET_STOP - VNET_START); 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 vnet_save_init((void *)ef->vnet_base, size); 771 elf_set_add(&set_vnet_list, ef->vnet_start, ef->vnet_stop, 772 ef->vnet_base); 773 774 return (0); 775 } 776 #endif 777 #undef LS_PADDING 778 779 /* 780 * Apply the specified protection to the loadable segments of a preloaded linker 781 * file. 782 */ 783 static int 784 preload_protect(elf_file_t ef, vm_prot_t prot) 785 { 786 #if defined(__aarch64__) || defined(__amd64__) 787 Elf_Ehdr *hdr; 788 Elf_Phdr *phdr, *phlimit; 789 vm_prot_t nprot; 790 int error; 791 792 error = 0; 793 hdr = (Elf_Ehdr *)ef->address; 794 phdr = (Elf_Phdr *)(ef->address + hdr->e_phoff); 795 phlimit = phdr + hdr->e_phnum; 796 for (; phdr < phlimit; phdr++) { 797 if (phdr->p_type != PT_LOAD) 798 continue; 799 800 nprot = prot | VM_PROT_READ; 801 if ((phdr->p_flags & PF_W) != 0) 802 nprot |= VM_PROT_WRITE; 803 if ((phdr->p_flags & PF_X) != 0) 804 nprot |= VM_PROT_EXECUTE; 805 error = pmap_change_prot((vm_offset_t)ef->address + 806 phdr->p_vaddr, round_page(phdr->p_memsz), nprot); 807 if (error != 0) 808 break; 809 } 810 return (error); 811 #else 812 return (0); 813 #endif 814 } 815 816 #ifdef __arm__ 817 /* 818 * Locate the ARM exception/unwind table info for DDB and stack(9) use by 819 * searching for the section header that describes it. There may be no unwind 820 * info, for example in a module containing only data. 821 */ 822 static void 823 link_elf_locate_exidx(linker_file_t lf, Elf_Shdr *shdr, int nhdr) 824 { 825 int i; 826 827 for (i = 0; i < nhdr; i++) { 828 if (shdr[i].sh_type == SHT_ARM_EXIDX) { 829 lf->exidx_addr = shdr[i].sh_addr + lf->address; 830 lf->exidx_size = shdr[i].sh_size; 831 break; 832 } 833 } 834 } 835 836 /* 837 * Locate the section headers metadata in a preloaded module, then use it to 838 * locate the exception/unwind table in the module. The size of the metadata 839 * block is stored in a uint32 word immediately before the data itself, and a 840 * comment in preload_search_info() says it is safe to rely on that. 841 */ 842 static void 843 link_elf_locate_exidx_preload(struct linker_file *lf, caddr_t modptr) 844 { 845 uint32_t *modinfo; 846 Elf_Shdr *shdr; 847 uint32_t nhdr; 848 849 modinfo = (uint32_t *)preload_search_info(modptr, 850 MODINFO_METADATA | MODINFOMD_SHDR); 851 if (modinfo != NULL) { 852 shdr = (Elf_Shdr *)modinfo; 853 nhdr = modinfo[-1] / sizeof(Elf_Shdr); 854 link_elf_locate_exidx(lf, shdr, nhdr); 855 } 856 } 857 858 #endif /* __arm__ */ 859 860 static int 861 link_elf_link_preload(linker_class_t cls, const char *filename, 862 linker_file_t *result) 863 { 864 Elf_Addr *ctors_addrp; 865 Elf_Size *ctors_sizep; 866 caddr_t modptr, baseptr, sizeptr, dynptr; 867 char *type; 868 elf_file_t ef; 869 linker_file_t lf; 870 int error; 871 vm_offset_t dp; 872 873 /* Look to see if we have the file preloaded */ 874 modptr = preload_search_by_name(filename); 875 if (modptr == NULL) 876 return (ENOENT); 877 878 type = (char *)preload_search_info(modptr, MODINFO_TYPE); 879 baseptr = preload_search_info(modptr, MODINFO_ADDR); 880 sizeptr = preload_search_info(modptr, MODINFO_SIZE); 881 dynptr = preload_search_info(modptr, 882 MODINFO_METADATA | MODINFOMD_DYNAMIC); 883 if (type == NULL || 884 (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE) " module") != 0 && 885 strcmp(type, "elf module") != 0)) 886 return (EFTYPE); 887 if (baseptr == NULL || sizeptr == NULL || dynptr == NULL) 888 return (EINVAL); 889 890 lf = linker_make_file(filename, &link_elf_class); 891 if (lf == NULL) 892 return (ENOMEM); 893 894 ef = (elf_file_t) lf; 895 ef->preloaded = 1; 896 ef->modptr = modptr; 897 ef->address = *(caddr_t *)baseptr; 898 #ifdef SPARSE_MAPPING 899 ef->object = NULL; 900 #endif 901 dp = (vm_offset_t)ef->address + *(vm_offset_t *)dynptr; 902 ef->dynamic = (Elf_Dyn *)dp; 903 lf->address = ef->address; 904 lf->size = *(size_t *)sizeptr; 905 906 ctors_addrp = (Elf_Addr *)preload_search_info(modptr, 907 MODINFO_METADATA | MODINFOMD_CTORS_ADDR); 908 ctors_sizep = (Elf_Size *)preload_search_info(modptr, 909 MODINFO_METADATA | MODINFOMD_CTORS_SIZE); 910 if (ctors_addrp != NULL && ctors_sizep != NULL) { 911 lf->ctors_addr = ef->address + *ctors_addrp; 912 lf->ctors_size = *ctors_sizep; 913 } 914 915 #ifdef __arm__ 916 link_elf_locate_exidx_preload(lf, modptr); 917 #endif 918 919 error = parse_dynamic(ef); 920 if (error == 0) 921 error = parse_dpcpu(ef); 922 #ifdef VIMAGE 923 if (error == 0) 924 error = parse_vnet(ef); 925 #endif 926 if (error == 0) 927 error = preload_protect(ef, VM_PROT_ALL); 928 if (error != 0) { 929 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 930 return (error); 931 } 932 link_elf_reloc_local(lf); 933 *result = lf; 934 return (0); 935 } 936 937 static int 938 link_elf_link_preload_finish(linker_file_t lf) 939 { 940 elf_file_t ef; 941 int error; 942 943 ef = (elf_file_t) lf; 944 error = relocate_file(ef); 945 if (error == 0) 946 error = preload_protect(ef, VM_PROT_NONE); 947 if (error != 0) 948 return (error); 949 (void)link_elf_preload_parse_symbols(ef); 950 951 return (link_elf_link_common_finish(lf)); 952 } 953 954 static int 955 link_elf_load_file(linker_class_t cls, const char* filename, 956 linker_file_t* result) 957 { 958 struct nameidata nd; 959 struct thread* td = curthread; /* XXX */ 960 Elf_Ehdr *hdr; 961 caddr_t firstpage, segbase; 962 int nbytes, i; 963 Elf_Phdr *phdr; 964 Elf_Phdr *phlimit; 965 Elf_Phdr *segs[MAXSEGS]; 966 int nsegs; 967 Elf_Phdr *phdyn; 968 caddr_t mapbase; 969 size_t mapsize; 970 Elf_Addr base_vaddr; 971 Elf_Addr base_vlimit; 972 int error = 0; 973 ssize_t resid; 974 int flags; 975 elf_file_t ef; 976 linker_file_t lf; 977 Elf_Shdr *shdr; 978 int symtabindex; 979 int symstrindex; 980 int shstrindex; 981 int symcnt; 982 int strcnt; 983 char *shstrs; 984 985 shdr = NULL; 986 lf = NULL; 987 shstrs = NULL; 988 989 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename); 990 flags = FREAD; 991 error = vn_open(&nd, &flags, 0, NULL); 992 if (error != 0) 993 return (error); 994 NDFREE_PNBUF(&nd); 995 if (nd.ni_vp->v_type != VREG) { 996 error = ENOEXEC; 997 firstpage = NULL; 998 goto out; 999 } 1000 #ifdef MAC 1001 error = mac_kld_check_load(curthread->td_ucred, nd.ni_vp); 1002 if (error != 0) { 1003 firstpage = NULL; 1004 goto out; 1005 } 1006 #endif 1007 1008 /* 1009 * Read the elf header from the file. 1010 */ 1011 firstpage = malloc(PAGE_SIZE, M_LINKER, M_WAITOK); 1012 hdr = (Elf_Ehdr *)firstpage; 1013 error = vn_rdwr(UIO_READ, nd.ni_vp, firstpage, PAGE_SIZE, 0, 1014 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1015 &resid, td); 1016 nbytes = PAGE_SIZE - resid; 1017 if (error != 0) 1018 goto out; 1019 1020 if (!IS_ELF(*hdr)) { 1021 error = ENOEXEC; 1022 goto out; 1023 } 1024 1025 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 1026 hdr->e_ident[EI_DATA] != ELF_TARG_DATA) { 1027 link_elf_error(filename, "Unsupported file layout"); 1028 error = ENOEXEC; 1029 goto out; 1030 } 1031 if (hdr->e_ident[EI_VERSION] != EV_CURRENT || 1032 hdr->e_version != EV_CURRENT) { 1033 link_elf_error(filename, "Unsupported file version"); 1034 error = ENOEXEC; 1035 goto out; 1036 } 1037 if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) { 1038 error = ENOSYS; 1039 goto out; 1040 } 1041 if (hdr->e_machine != ELF_TARG_MACH) { 1042 link_elf_error(filename, "Unsupported machine"); 1043 error = ENOEXEC; 1044 goto out; 1045 } 1046 1047 /* 1048 * We rely on the program header being in the first page. 1049 * This is not strictly required by the ABI specification, but 1050 * it seems to always true in practice. And, it simplifies 1051 * things considerably. 1052 */ 1053 if (!((hdr->e_phentsize == sizeof(Elf_Phdr)) && 1054 (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= PAGE_SIZE) && 1055 (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= nbytes))) 1056 link_elf_error(filename, "Unreadable program headers"); 1057 1058 /* 1059 * Scan the program header entries, and save key information. 1060 * 1061 * We rely on there being exactly two load segments, text and data, 1062 * in that order. 1063 */ 1064 phdr = (Elf_Phdr *) (firstpage + hdr->e_phoff); 1065 phlimit = phdr + hdr->e_phnum; 1066 nsegs = 0; 1067 phdyn = NULL; 1068 while (phdr < phlimit) { 1069 switch (phdr->p_type) { 1070 case PT_LOAD: 1071 if (nsegs == MAXSEGS) { 1072 link_elf_error(filename, "Too many sections"); 1073 error = ENOEXEC; 1074 goto out; 1075 } 1076 /* 1077 * XXX: We just trust they come in right order ?? 1078 */ 1079 segs[nsegs] = phdr; 1080 ++nsegs; 1081 break; 1082 1083 case PT_DYNAMIC: 1084 phdyn = phdr; 1085 break; 1086 1087 case PT_INTERP: 1088 error = ENOSYS; 1089 goto out; 1090 } 1091 1092 ++phdr; 1093 } 1094 if (phdyn == NULL) { 1095 link_elf_error(filename, "Object is not dynamically-linked"); 1096 error = ENOEXEC; 1097 goto out; 1098 } 1099 if (nsegs == 0) { 1100 link_elf_error(filename, "No sections"); 1101 error = ENOEXEC; 1102 goto out; 1103 } 1104 1105 /* 1106 * Allocate the entire address space of the object, to stake 1107 * out our contiguous region, and to establish the base 1108 * address for relocation. 1109 */ 1110 base_vaddr = trunc_page(segs[0]->p_vaddr); 1111 base_vlimit = round_page(segs[nsegs - 1]->p_vaddr + 1112 segs[nsegs - 1]->p_memsz); 1113 mapsize = base_vlimit - base_vaddr; 1114 1115 lf = linker_make_file(filename, &link_elf_class); 1116 if (lf == NULL) { 1117 error = ENOMEM; 1118 goto out; 1119 } 1120 1121 ef = (elf_file_t) lf; 1122 #ifdef SPARSE_MAPPING 1123 ef->object = vm_pager_allocate(OBJT_PHYS, NULL, mapsize, VM_PROT_ALL, 1124 0, thread0.td_ucred); 1125 if (ef->object == NULL) { 1126 error = ENOMEM; 1127 goto out; 1128 } 1129 #ifdef __amd64__ 1130 mapbase = (caddr_t)KERNBASE; 1131 #else 1132 mapbase = (caddr_t)vm_map_min(kernel_map); 1133 #endif 1134 /* 1135 * Mapping protections are downgraded after relocation processing. 1136 */ 1137 error = vm_map_find(kernel_map, ef->object, 0, 1138 (vm_offset_t *)&mapbase, mapsize, 0, VMFS_OPTIMAL_SPACE, 1139 VM_PROT_ALL, VM_PROT_ALL, 0); 1140 if (error != 0) { 1141 vm_object_deallocate(ef->object); 1142 ef->object = NULL; 1143 goto out; 1144 } 1145 #else 1146 mapbase = malloc_exec(mapsize, M_LINKER, M_WAITOK); 1147 #endif 1148 ef->address = mapbase; 1149 1150 /* 1151 * Read the text and data sections and zero the bss. 1152 */ 1153 for (i = 0; i < nsegs; i++) { 1154 segbase = mapbase + segs[i]->p_vaddr - base_vaddr; 1155 1156 #ifdef SPARSE_MAPPING 1157 /* 1158 * Consecutive segments may have different mapping permissions, 1159 * so be strict and verify that their mappings do not overlap. 1160 */ 1161 if (((vm_offset_t)segbase & PAGE_MASK) != 0) { 1162 error = EINVAL; 1163 goto out; 1164 } 1165 1166 error = vm_map_wire(kernel_map, 1167 (vm_offset_t)segbase, 1168 (vm_offset_t)segbase + round_page(segs[i]->p_memsz), 1169 VM_MAP_WIRE_SYSTEM | VM_MAP_WIRE_NOHOLES); 1170 if (error != KERN_SUCCESS) { 1171 error = ENOMEM; 1172 goto out; 1173 } 1174 #endif 1175 1176 error = vn_rdwr(UIO_READ, nd.ni_vp, 1177 segbase, segs[i]->p_filesz, segs[i]->p_offset, 1178 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1179 &resid, td); 1180 if (error != 0) 1181 goto out; 1182 bzero(segbase + segs[i]->p_filesz, 1183 segs[i]->p_memsz - segs[i]->p_filesz); 1184 } 1185 1186 ef->dynamic = (Elf_Dyn *) (mapbase + phdyn->p_vaddr - base_vaddr); 1187 1188 lf->address = ef->address; 1189 lf->size = mapsize; 1190 1191 error = parse_dynamic(ef); 1192 if (error != 0) 1193 goto out; 1194 error = parse_dpcpu(ef); 1195 if (error != 0) 1196 goto out; 1197 #ifdef VIMAGE 1198 error = parse_vnet(ef); 1199 if (error != 0) 1200 goto out; 1201 #endif 1202 link_elf_reloc_local(lf); 1203 1204 VOP_UNLOCK(nd.ni_vp); 1205 error = linker_load_dependencies(lf); 1206 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 1207 if (error != 0) 1208 goto out; 1209 error = relocate_file(ef); 1210 if (error != 0) 1211 goto out; 1212 1213 #ifdef SPARSE_MAPPING 1214 /* 1215 * Downgrade permissions on text segment mappings now that relocation 1216 * processing is complete. Restrict permissions on read-only segments. 1217 */ 1218 for (i = 0; i < nsegs; i++) { 1219 vm_prot_t prot; 1220 1221 if (segs[i]->p_type != PT_LOAD) 1222 continue; 1223 1224 prot = VM_PROT_READ; 1225 if ((segs[i]->p_flags & PF_W) != 0) 1226 prot |= VM_PROT_WRITE; 1227 if ((segs[i]->p_flags & PF_X) != 0) 1228 prot |= VM_PROT_EXECUTE; 1229 segbase = mapbase + segs[i]->p_vaddr - base_vaddr; 1230 error = vm_map_protect(kernel_map, 1231 (vm_offset_t)segbase, 1232 (vm_offset_t)segbase + round_page(segs[i]->p_memsz), 1233 prot, 0, VM_MAP_PROTECT_SET_PROT); 1234 if (error != KERN_SUCCESS) { 1235 error = ENOMEM; 1236 goto out; 1237 } 1238 } 1239 #endif 1240 1241 /* 1242 * Try and load the symbol table if it's present. (you can 1243 * strip it!) 1244 */ 1245 nbytes = hdr->e_shnum * hdr->e_shentsize; 1246 if (nbytes == 0 || hdr->e_shoff == 0) 1247 goto nosyms; 1248 shdr = malloc(nbytes, M_LINKER, M_WAITOK | M_ZERO); 1249 error = vn_rdwr(UIO_READ, nd.ni_vp, 1250 (caddr_t)shdr, nbytes, hdr->e_shoff, 1251 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1252 &resid, td); 1253 if (error != 0) 1254 goto out; 1255 1256 /* Read section string table */ 1257 shstrindex = hdr->e_shstrndx; 1258 if (shstrindex != 0 && shdr[shstrindex].sh_type == SHT_STRTAB && 1259 shdr[shstrindex].sh_size != 0) { 1260 nbytes = shdr[shstrindex].sh_size; 1261 shstrs = malloc(nbytes, M_LINKER, M_WAITOK | M_ZERO); 1262 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shstrs, nbytes, 1263 shdr[shstrindex].sh_offset, UIO_SYSSPACE, IO_NODELOCKED, 1264 td->td_ucred, NOCRED, &resid, td); 1265 if (error) 1266 goto out; 1267 } 1268 1269 symtabindex = -1; 1270 symstrindex = -1; 1271 for (i = 0; i < hdr->e_shnum; i++) { 1272 if (shdr[i].sh_type == SHT_SYMTAB) { 1273 symtabindex = i; 1274 symstrindex = shdr[i].sh_link; 1275 } else if (shstrs != NULL && shdr[i].sh_name != 0 && 1276 strcmp(shstrs + shdr[i].sh_name, ".ctors") == 0) { 1277 /* Record relocated address and size of .ctors. */ 1278 lf->ctors_addr = mapbase + shdr[i].sh_addr - base_vaddr; 1279 lf->ctors_size = shdr[i].sh_size; 1280 } 1281 } 1282 if (symtabindex < 0 || symstrindex < 0) 1283 goto nosyms; 1284 1285 symcnt = shdr[symtabindex].sh_size; 1286 ef->symbase = malloc(symcnt, M_LINKER, M_WAITOK); 1287 strcnt = shdr[symstrindex].sh_size; 1288 ef->strbase = malloc(strcnt, M_LINKER, M_WAITOK); 1289 1290 error = vn_rdwr(UIO_READ, nd.ni_vp, 1291 ef->symbase, symcnt, shdr[symtabindex].sh_offset, 1292 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1293 &resid, td); 1294 if (error != 0) 1295 goto out; 1296 error = vn_rdwr(UIO_READ, nd.ni_vp, 1297 ef->strbase, strcnt, shdr[symstrindex].sh_offset, 1298 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 1299 &resid, td); 1300 if (error != 0) 1301 goto out; 1302 1303 ef->ddbsymcnt = symcnt / sizeof(Elf_Sym); 1304 ef->ddbsymtab = (const Elf_Sym *)ef->symbase; 1305 ef->ddbstrcnt = strcnt; 1306 ef->ddbstrtab = ef->strbase; 1307 1308 nosyms: 1309 1310 #ifdef __arm__ 1311 link_elf_locate_exidx(lf, shdr, hdr->e_shnum); 1312 #endif 1313 1314 error = link_elf_link_common_finish(lf); 1315 if (error != 0) 1316 goto out; 1317 1318 *result = lf; 1319 1320 out: 1321 VOP_UNLOCK(nd.ni_vp); 1322 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 1323 if (error != 0 && lf != NULL) 1324 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 1325 free(shdr, M_LINKER); 1326 free(firstpage, M_LINKER); 1327 free(shstrs, M_LINKER); 1328 1329 return (error); 1330 } 1331 1332 Elf_Addr 1333 elf_relocaddr(linker_file_t lf, Elf_Addr x) 1334 { 1335 elf_file_t ef; 1336 1337 KASSERT(lf->ops->cls == (kobj_class_t)&link_elf_class, 1338 ("elf_relocaddr: unexpected linker file %p", lf)); 1339 1340 ef = (elf_file_t)lf; 1341 if (x >= ef->pcpu_start && x < ef->pcpu_stop) 1342 return ((x - ef->pcpu_start) + ef->pcpu_base); 1343 #ifdef VIMAGE 1344 if (x >= ef->vnet_start && x < ef->vnet_stop) 1345 return ((x - ef->vnet_start) + ef->vnet_base); 1346 #endif 1347 return (x); 1348 } 1349 1350 static void 1351 link_elf_unload_file(linker_file_t file) 1352 { 1353 elf_file_t ef = (elf_file_t) file; 1354 1355 if (ef->pcpu_base != 0) { 1356 dpcpu_free((void *)ef->pcpu_base, 1357 ef->pcpu_stop - ef->pcpu_start); 1358 elf_set_delete(&set_pcpu_list, ef->pcpu_start); 1359 } 1360 #ifdef VIMAGE 1361 if (ef->vnet_base != 0) { 1362 vnet_data_free((void *)ef->vnet_base, 1363 ef->vnet_stop - ef->vnet_start); 1364 elf_set_delete(&set_vnet_list, ef->vnet_start); 1365 } 1366 #endif 1367 #ifdef GDB 1368 if (ef->gdb.l_ld != NULL) { 1369 GDB_STATE(RT_DELETE); 1370 free((void *)(uintptr_t)ef->gdb.l_name, M_LINKER); 1371 link_elf_delete_gdb(&ef->gdb); 1372 GDB_STATE(RT_CONSISTENT); 1373 } 1374 #endif 1375 1376 /* Notify MD code that a module is being unloaded. */ 1377 elf_cpu_unload_file(file); 1378 1379 if (ef->preloaded) { 1380 link_elf_unload_preload(file); 1381 return; 1382 } 1383 1384 #ifdef SPARSE_MAPPING 1385 if (ef->object != NULL) { 1386 vm_map_remove(kernel_map, (vm_offset_t) ef->address, 1387 (vm_offset_t) ef->address 1388 + (ef->object->size << PAGE_SHIFT)); 1389 } 1390 #else 1391 free(ef->address, M_LINKER); 1392 #endif 1393 free(ef->symbase, M_LINKER); 1394 free(ef->strbase, M_LINKER); 1395 free(ef->ctftab, M_LINKER); 1396 free(ef->ctfoff, M_LINKER); 1397 free(ef->typoff, M_LINKER); 1398 } 1399 1400 static void 1401 link_elf_unload_preload(linker_file_t file) 1402 { 1403 1404 if (file->pathname != NULL) 1405 preload_delete_name(file->pathname); 1406 } 1407 1408 static const char * 1409 symbol_name(elf_file_t ef, Elf_Size r_info) 1410 { 1411 const Elf_Sym *ref; 1412 1413 if (ELF_R_SYM(r_info)) { 1414 ref = ef->symtab + ELF_R_SYM(r_info); 1415 return (ef->strtab + ref->st_name); 1416 } 1417 return (NULL); 1418 } 1419 1420 static int 1421 symbol_type(elf_file_t ef, Elf_Size r_info) 1422 { 1423 const Elf_Sym *ref; 1424 1425 if (ELF_R_SYM(r_info)) { 1426 ref = ef->symtab + ELF_R_SYM(r_info); 1427 return (ELF_ST_TYPE(ref->st_info)); 1428 } 1429 return (STT_NOTYPE); 1430 } 1431 1432 static int 1433 relocate_file1(elf_file_t ef, elf_lookup_fn lookup, elf_reloc_fn reloc, 1434 bool ifuncs) 1435 { 1436 const Elf_Rel *rel; 1437 const Elf_Rela *rela; 1438 const char *symname; 1439 1440 TSENTER(); 1441 #define APPLY_RELOCS(iter, tbl, tblsize, type) do { \ 1442 for ((iter) = (tbl); (iter) != NULL && \ 1443 (iter) < (tbl) + (tblsize) / sizeof(*(iter)); (iter)++) { \ 1444 if ((symbol_type(ef, (iter)->r_info) == \ 1445 STT_GNU_IFUNC || \ 1446 elf_is_ifunc_reloc((iter)->r_info)) != ifuncs) \ 1447 continue; \ 1448 if (reloc(&ef->lf, (Elf_Addr)ef->address, \ 1449 (iter), (type), lookup)) { \ 1450 symname = symbol_name(ef, (iter)->r_info); \ 1451 printf("link_elf: symbol %s undefined\n", \ 1452 symname); \ 1453 return (ENOENT); \ 1454 } \ 1455 } \ 1456 } while (0) 1457 1458 APPLY_RELOCS(rel, ef->rel, ef->relsize, ELF_RELOC_REL); 1459 TSENTER2("ef->rela"); 1460 APPLY_RELOCS(rela, ef->rela, ef->relasize, ELF_RELOC_RELA); 1461 TSEXIT2("ef->rela"); 1462 APPLY_RELOCS(rel, ef->pltrel, ef->pltrelsize, ELF_RELOC_REL); 1463 APPLY_RELOCS(rela, ef->pltrela, ef->pltrelasize, ELF_RELOC_RELA); 1464 1465 #undef APPLY_RELOCS 1466 1467 TSEXIT(); 1468 return (0); 1469 } 1470 1471 static int 1472 relocate_file(elf_file_t ef) 1473 { 1474 int error; 1475 1476 error = relocate_file1(ef, elf_lookup, elf_reloc, false); 1477 if (error == 0) 1478 error = relocate_file1(ef, elf_lookup, elf_reloc, true); 1479 return (error); 1480 } 1481 1482 /* 1483 * SysV hash function for symbol table lookup. It is specified by the 1484 * System V ABI. 1485 */ 1486 static Elf32_Word 1487 elf_hash(const char *name) 1488 { 1489 const unsigned char *p = (const unsigned char *)name; 1490 Elf32_Word h = 0; 1491 1492 while (*p != '\0') { 1493 h = (h << 4) + *p++; 1494 h ^= (h >> 24) & 0xf0; 1495 } 1496 return (h & 0x0fffffff); 1497 } 1498 1499 static int 1500 link_elf_lookup_symbol1(linker_file_t lf, const char *name, c_linker_sym_t *sym, 1501 bool see_local) 1502 { 1503 elf_file_t ef = (elf_file_t) lf; 1504 unsigned long symnum; 1505 const Elf_Sym* symp; 1506 const char *strp; 1507 Elf32_Word hash; 1508 1509 /* If we don't have a hash, bail. */ 1510 if (ef->buckets == NULL || ef->nbuckets == 0) { 1511 printf("link_elf_lookup_symbol: missing symbol hash table\n"); 1512 return (ENOENT); 1513 } 1514 1515 /* First, search hashed global symbols */ 1516 hash = elf_hash(name); 1517 symnum = ef->buckets[hash % ef->nbuckets]; 1518 1519 while (symnum != STN_UNDEF) { 1520 if (symnum >= ef->nchains) { 1521 printf("%s: corrupt symbol table\n", __func__); 1522 return (ENOENT); 1523 } 1524 1525 symp = ef->symtab + symnum; 1526 if (symp->st_name == 0) { 1527 printf("%s: corrupt symbol table\n", __func__); 1528 return (ENOENT); 1529 } 1530 1531 strp = ef->strtab + symp->st_name; 1532 1533 if (strcmp(name, strp) == 0) { 1534 if (symp->st_shndx != SHN_UNDEF || 1535 (symp->st_value != 0 && 1536 (ELF_ST_TYPE(symp->st_info) == STT_FUNC || 1537 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC))) { 1538 if (see_local || 1539 ELF_ST_BIND(symp->st_info) != STB_LOCAL) { 1540 *sym = (c_linker_sym_t) symp; 1541 return (0); 1542 } 1543 } 1544 return (ENOENT); 1545 } 1546 1547 symnum = ef->chains[symnum]; 1548 } 1549 1550 return (ENOENT); 1551 } 1552 1553 static int 1554 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym) 1555 { 1556 if (link_elf_leak_locals) 1557 return (link_elf_lookup_debug_symbol(lf, name, sym)); 1558 return (link_elf_lookup_symbol1(lf, name, sym, false)); 1559 } 1560 1561 static int 1562 link_elf_lookup_debug_symbol(linker_file_t lf, const char *name, 1563 c_linker_sym_t *sym) 1564 { 1565 elf_file_t ef = (elf_file_t)lf; 1566 const Elf_Sym* symp; 1567 const char *strp; 1568 int i; 1569 1570 if (link_elf_lookup_symbol1(lf, name, sym, true) == 0) 1571 return (0); 1572 1573 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1574 strp = ef->ddbstrtab + symp->st_name; 1575 if (strcmp(name, strp) == 0) { 1576 if (symp->st_shndx != SHN_UNDEF || 1577 (symp->st_value != 0 && 1578 (ELF_ST_TYPE(symp->st_info) == STT_FUNC || 1579 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC))) { 1580 *sym = (c_linker_sym_t) symp; 1581 return (0); 1582 } 1583 return (ENOENT); 1584 } 1585 } 1586 1587 return (ENOENT); 1588 } 1589 1590 static int 1591 link_elf_symbol_values1(linker_file_t lf, c_linker_sym_t sym, 1592 linker_symval_t *symval, bool see_local) 1593 { 1594 elf_file_t ef; 1595 const Elf_Sym *es; 1596 caddr_t val; 1597 1598 ef = (elf_file_t)lf; 1599 es = (const Elf_Sym *)sym; 1600 if (es >= ef->symtab && es < ef->symtab + ef->nchains) { 1601 if (!see_local && ELF_ST_BIND(es->st_info) == STB_LOCAL) 1602 return (ENOENT); 1603 symval->name = ef->strtab + es->st_name; 1604 val = (caddr_t)ef->address + es->st_value; 1605 if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC) 1606 val = ((caddr_t (*)(void))val)(); 1607 symval->value = val; 1608 symval->size = es->st_size; 1609 return (0); 1610 } 1611 return (ENOENT); 1612 } 1613 1614 static int 1615 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym, 1616 linker_symval_t *symval) 1617 { 1618 if (link_elf_leak_locals) 1619 return (link_elf_debug_symbol_values(lf, sym, symval)); 1620 return (link_elf_symbol_values1(lf, sym, symval, false)); 1621 } 1622 1623 static int 1624 link_elf_debug_symbol_values(linker_file_t lf, c_linker_sym_t sym, 1625 linker_symval_t *symval) 1626 { 1627 elf_file_t ef = (elf_file_t)lf; 1628 const Elf_Sym *es = (const Elf_Sym *)sym; 1629 caddr_t val; 1630 1631 if (link_elf_symbol_values1(lf, sym, symval, true) == 0) 1632 return (0); 1633 if (ef->symtab == ef->ddbsymtab) 1634 return (ENOENT); 1635 1636 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) { 1637 symval->name = ef->ddbstrtab + es->st_name; 1638 val = (caddr_t)ef->address + es->st_value; 1639 if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC) 1640 val = ((caddr_t (*)(void))val)(); 1641 symval->value = val; 1642 symval->size = es->st_size; 1643 return (0); 1644 } 1645 return (ENOENT); 1646 } 1647 1648 static int 1649 link_elf_search_symbol(linker_file_t lf, caddr_t value, 1650 c_linker_sym_t *sym, long *diffp) 1651 { 1652 elf_file_t ef = (elf_file_t)lf; 1653 u_long off = (uintptr_t)(void *)value; 1654 u_long diff = off; 1655 u_long st_value; 1656 const Elf_Sym *es; 1657 const Elf_Sym *best = NULL; 1658 int i; 1659 1660 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) { 1661 if (es->st_name == 0) 1662 continue; 1663 st_value = es->st_value + (uintptr_t) (void *) ef->address; 1664 if (off >= st_value) { 1665 if (off - st_value < diff) { 1666 diff = off - st_value; 1667 best = es; 1668 if (diff == 0) 1669 break; 1670 } else if (off - st_value == diff) { 1671 best = es; 1672 } 1673 } 1674 } 1675 if (best == NULL) 1676 *diffp = off; 1677 else 1678 *diffp = diff; 1679 *sym = (c_linker_sym_t) best; 1680 1681 return (0); 1682 } 1683 1684 /* 1685 * Look up a linker set on an ELF system. 1686 */ 1687 static int 1688 link_elf_lookup_set(linker_file_t lf, const char *name, 1689 void ***startp, void ***stopp, int *countp) 1690 { 1691 c_linker_sym_t sym; 1692 linker_symval_t symval; 1693 char *setsym; 1694 void **start, **stop; 1695 int len, error = 0, count; 1696 1697 len = strlen(name) + sizeof("__start_set_"); /* sizeof includes \0 */ 1698 setsym = malloc(len, M_LINKER, M_WAITOK); 1699 1700 /* get address of first entry */ 1701 snprintf(setsym, len, "%s%s", "__start_set_", name); 1702 error = link_elf_lookup_symbol(lf, setsym, &sym); 1703 if (error != 0) 1704 goto out; 1705 link_elf_symbol_values(lf, sym, &symval); 1706 if (symval.value == 0) { 1707 error = ESRCH; 1708 goto out; 1709 } 1710 start = (void **)symval.value; 1711 1712 /* get address of last entry */ 1713 snprintf(setsym, len, "%s%s", "__stop_set_", name); 1714 error = link_elf_lookup_symbol(lf, setsym, &sym); 1715 if (error != 0) 1716 goto out; 1717 link_elf_symbol_values(lf, sym, &symval); 1718 if (symval.value == 0) { 1719 error = ESRCH; 1720 goto out; 1721 } 1722 stop = (void **)symval.value; 1723 1724 /* and the number of entries */ 1725 count = stop - start; 1726 1727 /* and copy out */ 1728 if (startp != NULL) 1729 *startp = start; 1730 if (stopp != NULL) 1731 *stopp = stop; 1732 if (countp != NULL) 1733 *countp = count; 1734 1735 out: 1736 free(setsym, M_LINKER); 1737 return (error); 1738 } 1739 1740 static int 1741 link_elf_each_function_name(linker_file_t file, 1742 int (*callback)(const char *, void *), void *opaque) 1743 { 1744 elf_file_t ef = (elf_file_t)file; 1745 const Elf_Sym *symp; 1746 int i, error; 1747 1748 /* Exhaustive search */ 1749 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1750 if (symp->st_value != 0 && 1751 (ELF_ST_TYPE(symp->st_info) == STT_FUNC || 1752 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) { 1753 error = callback(ef->ddbstrtab + symp->st_name, opaque); 1754 if (error != 0) 1755 return (error); 1756 } 1757 } 1758 return (0); 1759 } 1760 1761 static int 1762 link_elf_each_function_nameval(linker_file_t file, 1763 linker_function_nameval_callback_t callback, void *opaque) 1764 { 1765 linker_symval_t symval; 1766 elf_file_t ef = (elf_file_t)file; 1767 const Elf_Sym *symp; 1768 int i, error; 1769 1770 /* Exhaustive search */ 1771 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1772 if (symp->st_value != 0 && 1773 (ELF_ST_TYPE(symp->st_info) == STT_FUNC || 1774 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) { 1775 error = link_elf_debug_symbol_values(file, 1776 (c_linker_sym_t) symp, &symval); 1777 if (error == 0) 1778 error = callback(file, i, &symval, opaque); 1779 if (error != 0) 1780 return (error); 1781 } 1782 } 1783 return (0); 1784 } 1785 1786 const Elf_Sym * 1787 elf_get_sym(linker_file_t lf, Elf_Size symidx) 1788 { 1789 elf_file_t ef = (elf_file_t)lf; 1790 1791 if (symidx >= ef->nchains) 1792 return (NULL); 1793 return (ef->symtab + symidx); 1794 } 1795 1796 const char * 1797 elf_get_symname(linker_file_t lf, Elf_Size symidx) 1798 { 1799 elf_file_t ef = (elf_file_t)lf; 1800 const Elf_Sym *sym; 1801 1802 if (symidx >= ef->nchains) 1803 return (NULL); 1804 sym = ef->symtab + symidx; 1805 return (ef->strtab + sym->st_name); 1806 } 1807 1808 /* 1809 * Symbol lookup function that can be used when the symbol index is known (ie 1810 * in relocations). It uses the symbol index instead of doing a fully fledged 1811 * hash table based lookup when such is valid. For example for local symbols. 1812 * This is not only more efficient, it's also more correct. It's not always 1813 * the case that the symbol can be found through the hash table. 1814 */ 1815 static int 1816 elf_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *res) 1817 { 1818 elf_file_t ef = (elf_file_t)lf; 1819 const Elf_Sym *sym; 1820 const char *symbol; 1821 Elf_Addr addr, start, base; 1822 1823 /* Don't even try to lookup the symbol if the index is bogus. */ 1824 if (symidx >= ef->nchains) { 1825 *res = 0; 1826 return (EINVAL); 1827 } 1828 1829 sym = ef->symtab + symidx; 1830 1831 /* 1832 * Don't do a full lookup when the symbol is local. It may even 1833 * fail because it may not be found through the hash table. 1834 */ 1835 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) { 1836 /* Force lookup failure when we have an insanity. */ 1837 if (sym->st_shndx == SHN_UNDEF || sym->st_value == 0) { 1838 *res = 0; 1839 return (EINVAL); 1840 } 1841 *res = ((Elf_Addr)ef->address + sym->st_value); 1842 return (0); 1843 } 1844 1845 /* 1846 * XXX we can avoid doing a hash table based lookup for global 1847 * symbols as well. This however is not always valid, so we'll 1848 * just do it the hard way for now. Performance tweaks can 1849 * always be added. 1850 */ 1851 1852 symbol = ef->strtab + sym->st_name; 1853 1854 /* Force a lookup failure if the symbol name is bogus. */ 1855 if (*symbol == 0) { 1856 *res = 0; 1857 return (EINVAL); 1858 } 1859 1860 addr = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps)); 1861 if (addr == 0 && ELF_ST_BIND(sym->st_info) != STB_WEAK) { 1862 *res = 0; 1863 return (EINVAL); 1864 } 1865 1866 if (elf_set_find(&set_pcpu_list, addr, &start, &base)) 1867 addr = addr - start + base; 1868 #ifdef VIMAGE 1869 else if (elf_set_find(&set_vnet_list, addr, &start, &base)) 1870 addr = addr - start + base; 1871 #endif 1872 *res = addr; 1873 return (0); 1874 } 1875 1876 static void 1877 link_elf_reloc_local(linker_file_t lf) 1878 { 1879 const Elf_Rel *rellim; 1880 const Elf_Rel *rel; 1881 const Elf_Rela *relalim; 1882 const Elf_Rela *rela; 1883 elf_file_t ef = (elf_file_t)lf; 1884 1885 /* Perform relocations without addend if there are any: */ 1886 if ((rel = ef->rel) != NULL) { 1887 rellim = (const Elf_Rel *)((const char *)ef->rel + ef->relsize); 1888 while (rel < rellim) { 1889 elf_reloc_local(lf, (Elf_Addr)ef->address, rel, 1890 ELF_RELOC_REL, elf_lookup); 1891 rel++; 1892 } 1893 } 1894 1895 /* Perform relocations with addend if there are any: */ 1896 if ((rela = ef->rela) != NULL) { 1897 relalim = (const Elf_Rela *) 1898 ((const char *)ef->rela + ef->relasize); 1899 while (rela < relalim) { 1900 elf_reloc_local(lf, (Elf_Addr)ef->address, rela, 1901 ELF_RELOC_RELA, elf_lookup); 1902 rela++; 1903 } 1904 } 1905 } 1906 1907 static long 1908 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab) 1909 { 1910 elf_file_t ef = (elf_file_t)lf; 1911 1912 *symtab = ef->ddbsymtab; 1913 1914 if (*symtab == NULL) 1915 return (0); 1916 1917 return (ef->ddbsymcnt); 1918 } 1919 1920 static long 1921 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab) 1922 { 1923 elf_file_t ef = (elf_file_t)lf; 1924 1925 *strtab = ef->ddbstrtab; 1926 1927 if (*strtab == NULL) 1928 return (0); 1929 1930 return (ef->ddbstrcnt); 1931 } 1932 1933 #ifdef VIMAGE 1934 static void 1935 link_elf_propagate_vnets(linker_file_t lf) 1936 { 1937 elf_file_t ef = (elf_file_t)lf; 1938 int size; 1939 1940 if (ef->vnet_base != 0) { 1941 size = (uintptr_t)ef->vnet_stop - (uintptr_t)ef->vnet_start; 1942 vnet_data_copy((void *)ef->vnet_base, size); 1943 } 1944 } 1945 #endif 1946 1947 #if defined(__i386__) || defined(__amd64__) || defined(__aarch64__) || defined(__powerpc__) 1948 /* 1949 * Use this lookup routine when performing relocations early during boot. 1950 * The generic lookup routine depends on kobj, which is not initialized 1951 * at that point. 1952 */ 1953 static int 1954 elf_lookup_ifunc(linker_file_t lf, Elf_Size symidx, int deps __unused, 1955 Elf_Addr *res) 1956 { 1957 elf_file_t ef; 1958 const Elf_Sym *symp; 1959 caddr_t val; 1960 1961 ef = (elf_file_t)lf; 1962 symp = ef->symtab + symidx; 1963 if (ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC) { 1964 val = (caddr_t)ef->address + symp->st_value; 1965 *res = ((Elf_Addr (*)(void))val)(); 1966 return (0); 1967 } 1968 return (ENOENT); 1969 } 1970 1971 void 1972 link_elf_ireloc(caddr_t kmdp) 1973 { 1974 struct elf_file eff; 1975 elf_file_t ef; 1976 1977 TSENTER(); 1978 ef = &eff; 1979 1980 bzero_early(ef, sizeof(*ef)); 1981 1982 ef->modptr = kmdp; 1983 ef->dynamic = (Elf_Dyn *)&_DYNAMIC; 1984 1985 #ifdef RELOCATABLE_KERNEL 1986 ef->address = (caddr_t) (__startkernel - KERNBASE); 1987 #else 1988 ef->address = 0; 1989 #endif 1990 parse_dynamic(ef); 1991 1992 link_elf_preload_parse_symbols(ef); 1993 relocate_file1(ef, elf_lookup_ifunc, elf_reloc, true); 1994 TSEXIT(); 1995 } 1996 1997 #if defined(__aarch64__) || defined(__amd64__) 1998 void 1999 link_elf_late_ireloc(void) 2000 { 2001 elf_file_t ef; 2002 2003 KASSERT(linker_kernel_file != NULL, 2004 ("link_elf_late_ireloc: No kernel linker file found")); 2005 ef = (elf_file_t)linker_kernel_file; 2006 2007 relocate_file1(ef, elf_lookup_ifunc, elf_reloc_late, true); 2008 } 2009 #endif 2010 #endif 2011