1 /*- 2 * Copyright (c) 1998-2000 Doug Rabson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include "opt_ddb.h" 31 #include "opt_gdb.h" 32 #include "opt_mac.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #ifdef GPROF 37 #include <sys/gmon.h> 38 #endif 39 #include <sys/kernel.h> 40 #include <sys/lock.h> 41 #include <sys/malloc.h> 42 #include <sys/mutex.h> 43 #include <sys/mount.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 50 #include <machine/elf.h> 51 52 #include <security/mac/mac_framework.h> 53 54 #include <vm/vm.h> 55 #include <vm/vm_param.h> 56 #ifdef SPARSE_MAPPING 57 #include <vm/vm_object.h> 58 #include <vm/vm_kern.h> 59 #include <vm/vm_extern.h> 60 #endif 61 #include <vm/pmap.h> 62 #include <vm/vm_map.h> 63 64 #include <sys/link_elf.h> 65 66 #ifdef DDB_CTF 67 #include <net/zlib.h> 68 #endif 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 #ifdef GDB 112 struct link_map gdb; /* hooks for gdb */ 113 #endif 114 } *elf_file_t; 115 116 #include <kern/kern_ctf.c> 117 118 static int link_elf_link_common_finish(linker_file_t); 119 static int link_elf_link_preload(linker_class_t cls, 120 const char*, linker_file_t*); 121 static int link_elf_link_preload_finish(linker_file_t); 122 static int link_elf_load_file(linker_class_t, const char*, linker_file_t*); 123 static int link_elf_lookup_symbol(linker_file_t, const char*, 124 c_linker_sym_t*); 125 static int link_elf_symbol_values(linker_file_t, c_linker_sym_t, linker_symval_t*); 126 static int link_elf_search_symbol(linker_file_t, caddr_t value, 127 c_linker_sym_t* sym, long* diffp); 128 129 static void link_elf_unload_file(linker_file_t); 130 static void link_elf_unload_preload(linker_file_t); 131 static int link_elf_lookup_set(linker_file_t, const char *, 132 void ***, void ***, int *); 133 static int link_elf_each_function_name(linker_file_t, 134 int (*)(const char *, void *), 135 void *); 136 static int link_elf_each_function_nameval(linker_file_t, 137 linker_function_nameval_callback_t, 138 void *); 139 static void link_elf_reloc_local(linker_file_t); 140 static Elf_Addr elf_lookup(linker_file_t lf, Elf_Size symidx, int deps); 141 142 static kobj_method_t link_elf_methods[] = { 143 KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol), 144 KOBJMETHOD(linker_symbol_values, link_elf_symbol_values), 145 KOBJMETHOD(linker_search_symbol, link_elf_search_symbol), 146 KOBJMETHOD(linker_unload, link_elf_unload_file), 147 KOBJMETHOD(linker_load_file, link_elf_load_file), 148 KOBJMETHOD(linker_link_preload, link_elf_link_preload), 149 KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish), 150 KOBJMETHOD(linker_lookup_set, link_elf_lookup_set), 151 KOBJMETHOD(linker_each_function_name, link_elf_each_function_name), 152 KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval), 153 KOBJMETHOD(linker_ctf_get, link_elf_ctf_get), 154 { 0, 0 } 155 }; 156 157 static struct linker_class link_elf_class = { 158 #if ELF_TARG_CLASS == ELFCLASS32 159 "elf32", 160 #else 161 "elf64", 162 #endif 163 link_elf_methods, sizeof(struct elf_file) 164 }; 165 166 static int parse_dynamic(elf_file_t ef); 167 static int relocate_file(elf_file_t ef); 168 static int link_elf_preload_parse_symbols(elf_file_t ef); 169 170 #ifdef GDB 171 static void r_debug_state(struct r_debug *dummy_one, 172 struct link_map *dummy_two); 173 174 /* 175 * A list of loaded modules for GDB to use for loading symbols. 176 */ 177 struct r_debug r_debug; 178 179 #define GDB_STATE(s) r_debug.r_state = s; r_debug_state(NULL, NULL); 180 181 /* 182 * Function for the debugger to set a breakpoint on to gain control. 183 */ 184 static void 185 r_debug_state(struct r_debug *dummy_one __unused, 186 struct link_map *dummy_two __unused) 187 { 188 } 189 190 static void 191 link_elf_add_gdb(struct link_map *l) 192 { 193 struct link_map *prev; 194 195 l->l_next = NULL; 196 197 if (r_debug.r_map == NULL) { 198 /* Add first. */ 199 l->l_prev = NULL; 200 r_debug.r_map = l; 201 } else { 202 /* Append to list. */ 203 for (prev = r_debug.r_map; prev->l_next != NULL; prev = prev->l_next) 204 ; 205 l->l_prev = prev; 206 prev->l_next = l; 207 } 208 } 209 210 static void 211 link_elf_delete_gdb(struct link_map *l) 212 { 213 if (l->l_prev == NULL) { 214 /* Remove first. */ 215 if ((r_debug.r_map = l->l_next) != NULL) 216 l->l_next->l_prev = NULL; 217 } else { 218 /* Remove any but first. */ 219 if ((l->l_prev->l_next = l->l_next) != NULL) 220 l->l_next->l_prev = l->l_prev; 221 } 222 } 223 #endif /* GDB */ 224 225 #ifdef __ia64__ 226 Elf_Addr link_elf_get_gp(linker_file_t); 227 #endif 228 229 /* 230 * The kernel symbol table starts here. 231 */ 232 extern struct _dynamic _DYNAMIC; 233 234 static void 235 link_elf_error(const char *s) 236 { 237 printf("kldload: %s\n", s); 238 } 239 240 /* 241 * Actions performed after linking/loading both the preloaded kernel and any 242 * modules; whether preloaded or dynamicly loaded. 243 */ 244 static int 245 link_elf_link_common_finish(linker_file_t lf) 246 { 247 #ifdef GDB 248 elf_file_t ef = (elf_file_t)lf; 249 char *newfilename; 250 #endif 251 int error; 252 253 /* Notify MD code that a module is being loaded. */ 254 error = elf_cpu_load_file(lf); 255 if (error) 256 return (error); 257 258 #ifdef GDB 259 GDB_STATE(RT_ADD); 260 ef->gdb.l_addr = lf->address; 261 newfilename = malloc(strlen(lf->filename) + 1, M_LINKER, M_WAITOK); 262 strcpy(newfilename, lf->filename); 263 ef->gdb.l_name = newfilename; 264 ef->gdb.l_ld = ef->dynamic; 265 link_elf_add_gdb(&ef->gdb); 266 GDB_STATE(RT_CONSISTENT); 267 #endif 268 269 return (0); 270 } 271 272 static void 273 link_elf_init(void* arg) 274 { 275 Elf_Dyn *dp; 276 caddr_t modptr, baseptr, sizeptr; 277 elf_file_t ef; 278 char *modname; 279 280 linker_add_class(&link_elf_class); 281 282 dp = (Elf_Dyn*) &_DYNAMIC; 283 modname = NULL; 284 modptr = preload_search_by_type("elf" __XSTRING(__ELF_WORD_SIZE) " kernel"); 285 if (modptr == NULL) 286 modptr = preload_search_by_type("elf kernel"); 287 if (modptr) 288 modname = (char *)preload_search_info(modptr, MODINFO_NAME); 289 if (modname == NULL) 290 modname = "kernel"; 291 linker_kernel_file = linker_make_file(modname, &link_elf_class); 292 if (linker_kernel_file == NULL) 293 panic("link_elf_init: Can't create linker structures for kernel"); 294 295 ef = (elf_file_t) linker_kernel_file; 296 ef->preloaded = 1; 297 ef->address = 0; 298 #ifdef SPARSE_MAPPING 299 ef->object = 0; 300 #endif 301 ef->dynamic = dp; 302 303 if (dp) 304 parse_dynamic(ef); 305 linker_kernel_file->address = (caddr_t) KERNBASE; 306 linker_kernel_file->size = -(intptr_t)linker_kernel_file->address; 307 308 if (modptr) { 309 ef->modptr = modptr; 310 baseptr = preload_search_info(modptr, MODINFO_ADDR); 311 if (baseptr) 312 linker_kernel_file->address = *(caddr_t *)baseptr; 313 sizeptr = preload_search_info(modptr, MODINFO_SIZE); 314 if (sizeptr) 315 linker_kernel_file->size = *(size_t *)sizeptr; 316 } 317 (void)link_elf_preload_parse_symbols(ef); 318 319 #ifdef GDB 320 r_debug.r_map = NULL; 321 r_debug.r_brk = r_debug_state; 322 r_debug.r_state = RT_CONSISTENT; 323 #endif 324 325 (void)link_elf_link_common_finish(linker_kernel_file); 326 linker_kernel_file->flags |= LINKER_FILE_LINKED; 327 } 328 329 SYSINIT(link_elf, SI_SUB_KLD, SI_ORDER_THIRD, link_elf_init, 0); 330 331 static int 332 link_elf_preload_parse_symbols(elf_file_t ef) 333 { 334 caddr_t pointer; 335 caddr_t ssym, esym, base; 336 caddr_t strtab; 337 int strcnt; 338 Elf_Sym* symtab; 339 int symcnt; 340 341 if (ef->modptr == NULL) 342 return 0; 343 pointer = preload_search_info(ef->modptr, MODINFO_METADATA|MODINFOMD_SSYM); 344 if (pointer == NULL) 345 return 0; 346 ssym = *(caddr_t *)pointer; 347 pointer = preload_search_info(ef->modptr, MODINFO_METADATA|MODINFOMD_ESYM); 348 if (pointer == NULL) 349 return 0; 350 esym = *(caddr_t *)pointer; 351 352 base = ssym; 353 354 symcnt = *(long *)base; 355 base += sizeof(long); 356 symtab = (Elf_Sym *)base; 357 base += roundup(symcnt, sizeof(long)); 358 359 if (base > esym || base < ssym) { 360 printf("Symbols are corrupt!\n"); 361 return EINVAL; 362 } 363 364 strcnt = *(long *)base; 365 base += sizeof(long); 366 strtab = base; 367 base += roundup(strcnt, sizeof(long)); 368 369 if (base > esym || base < ssym) { 370 printf("Symbols are corrupt!\n"); 371 return EINVAL; 372 } 373 374 ef->ddbsymtab = symtab; 375 ef->ddbsymcnt = symcnt / sizeof(Elf_Sym); 376 ef->ddbstrtab = strtab; 377 ef->ddbstrcnt = strcnt; 378 379 return 0; 380 } 381 382 static int 383 parse_dynamic(elf_file_t ef) 384 { 385 Elf_Dyn *dp; 386 int plttype = DT_REL; 387 388 for (dp = ef->dynamic; dp->d_tag != DT_NULL; dp++) { 389 switch (dp->d_tag) { 390 case DT_HASH: 391 { 392 /* From src/libexec/rtld-elf/rtld.c */ 393 const Elf_Hashelt *hashtab = (const Elf_Hashelt *) 394 (ef->address + dp->d_un.d_ptr); 395 ef->nbuckets = hashtab[0]; 396 ef->nchains = hashtab[1]; 397 ef->buckets = hashtab + 2; 398 ef->chains = ef->buckets + ef->nbuckets; 399 break; 400 } 401 case DT_STRTAB: 402 ef->strtab = (caddr_t) (ef->address + dp->d_un.d_ptr); 403 break; 404 case DT_STRSZ: 405 ef->strsz = dp->d_un.d_val; 406 break; 407 case DT_SYMTAB: 408 ef->symtab = (Elf_Sym*) (ef->address + dp->d_un.d_ptr); 409 break; 410 case DT_SYMENT: 411 if (dp->d_un.d_val != sizeof(Elf_Sym)) 412 return ENOEXEC; 413 break; 414 case DT_PLTGOT: 415 ef->got = (Elf_Addr *) (ef->address + dp->d_un.d_ptr); 416 break; 417 case DT_REL: 418 ef->rel = (const Elf_Rel *) (ef->address + dp->d_un.d_ptr); 419 break; 420 case DT_RELSZ: 421 ef->relsize = dp->d_un.d_val; 422 break; 423 case DT_RELENT: 424 if (dp->d_un.d_val != sizeof(Elf_Rel)) 425 return ENOEXEC; 426 break; 427 case DT_JMPREL: 428 ef->pltrel = (const Elf_Rel *) (ef->address + dp->d_un.d_ptr); 429 break; 430 case DT_PLTRELSZ: 431 ef->pltrelsize = dp->d_un.d_val; 432 break; 433 case DT_RELA: 434 ef->rela = (const Elf_Rela *) (ef->address + dp->d_un.d_ptr); 435 break; 436 case DT_RELASZ: 437 ef->relasize = dp->d_un.d_val; 438 break; 439 case DT_RELAENT: 440 if (dp->d_un.d_val != sizeof(Elf_Rela)) 441 return ENOEXEC; 442 break; 443 case DT_PLTREL: 444 plttype = dp->d_un.d_val; 445 if (plttype != DT_REL && plttype != DT_RELA) 446 return ENOEXEC; 447 break; 448 #ifdef GDB 449 case DT_DEBUG: 450 dp->d_un.d_ptr = (Elf_Addr) &r_debug; 451 break; 452 #endif 453 } 454 } 455 456 if (plttype == DT_RELA) { 457 ef->pltrela = (const Elf_Rela *) ef->pltrel; 458 ef->pltrel = NULL; 459 ef->pltrelasize = ef->pltrelsize; 460 ef->pltrelsize = 0; 461 } 462 463 ef->ddbsymtab = ef->symtab; 464 ef->ddbsymcnt = ef->nchains; 465 ef->ddbstrtab = ef->strtab; 466 ef->ddbstrcnt = ef->strsz; 467 468 return 0; 469 } 470 471 static int 472 link_elf_link_preload(linker_class_t cls, 473 const char* filename, linker_file_t *result) 474 { 475 caddr_t modptr, baseptr, sizeptr, dynptr; 476 char *type; 477 elf_file_t ef; 478 linker_file_t lf; 479 int error; 480 vm_offset_t dp; 481 482 /* Look to see if we have the file preloaded */ 483 modptr = preload_search_by_name(filename); 484 if (modptr == NULL) 485 return ENOENT; 486 487 type = (char *)preload_search_info(modptr, MODINFO_TYPE); 488 baseptr = preload_search_info(modptr, MODINFO_ADDR); 489 sizeptr = preload_search_info(modptr, MODINFO_SIZE); 490 dynptr = preload_search_info(modptr, MODINFO_METADATA|MODINFOMD_DYNAMIC); 491 if (type == NULL || 492 (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE) " module") != 0 && 493 strcmp(type, "elf module") != 0)) 494 return (EFTYPE); 495 if (baseptr == NULL || sizeptr == NULL || dynptr == NULL) 496 return (EINVAL); 497 498 lf = linker_make_file(filename, &link_elf_class); 499 if (lf == NULL) { 500 return ENOMEM; 501 } 502 503 ef = (elf_file_t) lf; 504 ef->preloaded = 1; 505 ef->modptr = modptr; 506 ef->address = *(caddr_t *)baseptr; 507 #ifdef SPARSE_MAPPING 508 ef->object = 0; 509 #endif 510 dp = (vm_offset_t)ef->address + *(vm_offset_t *)dynptr; 511 ef->dynamic = (Elf_Dyn *)dp; 512 lf->address = ef->address; 513 lf->size = *(size_t *)sizeptr; 514 515 error = parse_dynamic(ef); 516 if (error) { 517 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 518 return error; 519 } 520 link_elf_reloc_local(lf); 521 *result = lf; 522 return (0); 523 } 524 525 static int 526 link_elf_link_preload_finish(linker_file_t lf) 527 { 528 elf_file_t ef; 529 int error; 530 531 ef = (elf_file_t) lf; 532 #if 0 /* this will be more trouble than it's worth for now */ 533 for (dp = ef->dynamic; dp->d_tag != DT_NULL; dp++) { 534 if (dp->d_tag != DT_NEEDED) 535 continue; 536 modname = ef->strtab + dp->d_un.d_val; 537 error = linker_load_module(modname, lf); 538 if (error) 539 goto out; 540 } 541 #endif 542 error = relocate_file(ef); 543 if (error) 544 return error; 545 (void)link_elf_preload_parse_symbols(ef); 546 547 return (link_elf_link_common_finish(lf)); 548 } 549 550 static int 551 link_elf_load_file(linker_class_t cls, const char* filename, 552 linker_file_t* result) 553 { 554 struct nameidata nd; 555 struct thread* td = curthread; /* XXX */ 556 Elf_Ehdr *hdr; 557 caddr_t firstpage; 558 int nbytes, i; 559 Elf_Phdr *phdr; 560 Elf_Phdr *phlimit; 561 Elf_Phdr *segs[MAXSEGS]; 562 int nsegs; 563 Elf_Phdr *phdyn; 564 Elf_Phdr *phphdr; 565 caddr_t mapbase; 566 size_t mapsize; 567 Elf_Off base_offset; 568 Elf_Addr base_vaddr; 569 Elf_Addr base_vlimit; 570 int error = 0; 571 int resid, flags; 572 elf_file_t ef; 573 linker_file_t lf; 574 Elf_Shdr *shdr; 575 int symtabindex; 576 int symstrindex; 577 int symcnt; 578 int strcnt; 579 int vfslocked; 580 581 shdr = NULL; 582 lf = NULL; 583 584 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_SYSSPACE, filename, td); 585 flags = FREAD; 586 error = vn_open(&nd, &flags, 0, NULL); 587 if (error) 588 return error; 589 vfslocked = NDHASGIANT(&nd); 590 NDFREE(&nd, NDF_ONLY_PNBUF); 591 if (nd.ni_vp->v_type != VREG) { 592 error = ENOEXEC; 593 firstpage = NULL; 594 goto out; 595 } 596 #ifdef MAC 597 error = mac_kld_check_load(curthread->td_ucred, nd.ni_vp); 598 if (error) { 599 firstpage = NULL; 600 goto out; 601 } 602 #endif 603 604 /* 605 * Read the elf header from the file. 606 */ 607 firstpage = malloc(PAGE_SIZE, M_LINKER, M_WAITOK); 608 if (firstpage == NULL) { 609 error = ENOMEM; 610 goto out; 611 } 612 hdr = (Elf_Ehdr *)firstpage; 613 error = vn_rdwr(UIO_READ, nd.ni_vp, firstpage, PAGE_SIZE, 0, 614 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 615 &resid, td); 616 nbytes = PAGE_SIZE - resid; 617 if (error) 618 goto out; 619 620 if (!IS_ELF(*hdr)) { 621 error = ENOEXEC; 622 goto out; 623 } 624 625 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS 626 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) { 627 link_elf_error("Unsupported file layout"); 628 error = ENOEXEC; 629 goto out; 630 } 631 if (hdr->e_ident[EI_VERSION] != EV_CURRENT 632 || hdr->e_version != EV_CURRENT) { 633 link_elf_error("Unsupported file version"); 634 error = ENOEXEC; 635 goto out; 636 } 637 if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) { 638 link_elf_error("Unsupported file type"); 639 error = ENOEXEC; 640 goto out; 641 } 642 if (hdr->e_machine != ELF_TARG_MACH) { 643 link_elf_error("Unsupported machine"); 644 error = ENOEXEC; 645 goto out; 646 } 647 648 /* 649 * We rely on the program header being in the first page. This is 650 * not strictly required by the ABI specification, but it seems to 651 * always true in practice. And, it simplifies things considerably. 652 */ 653 if (!((hdr->e_phentsize == sizeof(Elf_Phdr)) && 654 (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= PAGE_SIZE) && 655 (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= nbytes))) 656 link_elf_error("Unreadable program headers"); 657 658 /* 659 * Scan the program header entries, and save key information. 660 * 661 * We rely on there being exactly two load segments, text and data, 662 * in that order. 663 */ 664 phdr = (Elf_Phdr *) (firstpage + hdr->e_phoff); 665 phlimit = phdr + hdr->e_phnum; 666 nsegs = 0; 667 phdyn = NULL; 668 phphdr = NULL; 669 while (phdr < phlimit) { 670 switch (phdr->p_type) { 671 672 case PT_LOAD: 673 if (nsegs == MAXSEGS) { 674 link_elf_error("Too many sections"); 675 error = ENOEXEC; 676 goto out; 677 } 678 /* 679 * XXX: We just trust they come in right order ?? 680 */ 681 segs[nsegs] = phdr; 682 ++nsegs; 683 break; 684 685 case PT_PHDR: 686 phphdr = phdr; 687 break; 688 689 case PT_DYNAMIC: 690 phdyn = phdr; 691 break; 692 693 case PT_INTERP: 694 link_elf_error("Unsupported file type"); 695 error = ENOEXEC; 696 goto out; 697 } 698 699 ++phdr; 700 } 701 if (phdyn == NULL) { 702 link_elf_error("Object is not dynamically-linked"); 703 error = ENOEXEC; 704 goto out; 705 } 706 if (nsegs == 0) { 707 link_elf_error("No sections"); 708 error = ENOEXEC; 709 goto out; 710 } 711 712 /* 713 * Allocate the entire address space of the object, to stake out our 714 * contiguous region, and to establish the base address for relocation. 715 */ 716 base_offset = trunc_page(segs[0]->p_offset); 717 base_vaddr = trunc_page(segs[0]->p_vaddr); 718 base_vlimit = round_page(segs[nsegs - 1]->p_vaddr + 719 segs[nsegs - 1]->p_memsz); 720 mapsize = base_vlimit - base_vaddr; 721 722 lf = linker_make_file(filename, &link_elf_class); 723 if (!lf) { 724 error = ENOMEM; 725 goto out; 726 } 727 728 ef = (elf_file_t) lf; 729 #ifdef SPARSE_MAPPING 730 ef->object = vm_object_allocate(OBJT_DEFAULT, mapsize >> PAGE_SHIFT); 731 if (ef->object == NULL) { 732 error = ENOMEM; 733 goto out; 734 } 735 ef->address = (caddr_t) vm_map_min(kernel_map); 736 error = vm_map_find(kernel_map, ef->object, 0, 737 (vm_offset_t *) &ef->address, 738 mapsize, 1, 739 VM_PROT_ALL, VM_PROT_ALL, 0); 740 if (error) { 741 vm_object_deallocate(ef->object); 742 ef->object = 0; 743 goto out; 744 } 745 #else 746 ef->address = malloc(mapsize, M_LINKER, M_WAITOK); 747 if (!ef->address) { 748 error = ENOMEM; 749 goto out; 750 } 751 #endif 752 mapbase = ef->address; 753 754 /* 755 * Read the text and data sections and zero the bss. 756 */ 757 for (i = 0; i < nsegs; i++) { 758 caddr_t segbase = mapbase + segs[i]->p_vaddr - base_vaddr; 759 error = vn_rdwr(UIO_READ, nd.ni_vp, 760 segbase, segs[i]->p_filesz, segs[i]->p_offset, 761 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 762 &resid, td); 763 if (error) { 764 goto out; 765 } 766 bzero(segbase + segs[i]->p_filesz, 767 segs[i]->p_memsz - segs[i]->p_filesz); 768 769 #ifdef SPARSE_MAPPING 770 /* 771 * Wire down the pages 772 */ 773 error = vm_map_wire(kernel_map, 774 (vm_offset_t) segbase, 775 (vm_offset_t) segbase + segs[i]->p_memsz, 776 VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES); 777 if (error != KERN_SUCCESS) { 778 error = ENOMEM; 779 goto out; 780 } 781 #endif 782 } 783 784 #ifdef GPROF 785 /* Update profiling information with the new text segment. */ 786 mtx_lock(&Giant); 787 kmupetext((uintfptr_t)(mapbase + segs[0]->p_vaddr - base_vaddr + 788 segs[0]->p_memsz)); 789 mtx_unlock(&Giant); 790 #endif 791 792 ef->dynamic = (Elf_Dyn *) (mapbase + phdyn->p_vaddr - base_vaddr); 793 794 lf->address = ef->address; 795 lf->size = mapsize; 796 797 error = parse_dynamic(ef); 798 if (error) 799 goto out; 800 link_elf_reloc_local(lf); 801 802 error = linker_load_dependencies(lf); 803 if (error) 804 goto out; 805 #if 0 /* this will be more trouble than it's worth for now */ 806 for (dp = ef->dynamic; dp->d_tag != DT_NULL; dp++) { 807 if (dp->d_tag != DT_NEEDED) 808 continue; 809 modname = ef->strtab + dp->d_un.d_val; 810 error = linker_load_module(modname, lf); 811 if (error) 812 goto out; 813 } 814 #endif 815 error = relocate_file(ef); 816 if (error) 817 goto out; 818 819 /* Try and load the symbol table if it's present. (you can strip it!) */ 820 nbytes = hdr->e_shnum * hdr->e_shentsize; 821 if (nbytes == 0 || hdr->e_shoff == 0) 822 goto nosyms; 823 shdr = malloc(nbytes, M_LINKER, M_WAITOK | M_ZERO); 824 if (shdr == NULL) { 825 error = ENOMEM; 826 goto out; 827 } 828 error = vn_rdwr(UIO_READ, nd.ni_vp, 829 (caddr_t)shdr, nbytes, hdr->e_shoff, 830 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 831 &resid, td); 832 if (error) 833 goto out; 834 symtabindex = -1; 835 symstrindex = -1; 836 for (i = 0; i < hdr->e_shnum; i++) { 837 if (shdr[i].sh_type == SHT_SYMTAB) { 838 symtabindex = i; 839 symstrindex = shdr[i].sh_link; 840 } 841 } 842 if (symtabindex < 0 || symstrindex < 0) 843 goto nosyms; 844 845 symcnt = shdr[symtabindex].sh_size; 846 ef->symbase = malloc(symcnt, M_LINKER, M_WAITOK); 847 strcnt = shdr[symstrindex].sh_size; 848 ef->strbase = malloc(strcnt, M_LINKER, M_WAITOK); 849 850 if (ef->symbase == NULL || ef->strbase == NULL) { 851 error = ENOMEM; 852 goto out; 853 } 854 error = vn_rdwr(UIO_READ, nd.ni_vp, 855 ef->symbase, symcnt, shdr[symtabindex].sh_offset, 856 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 857 &resid, td); 858 if (error) 859 goto out; 860 error = vn_rdwr(UIO_READ, nd.ni_vp, 861 ef->strbase, strcnt, shdr[symstrindex].sh_offset, 862 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 863 &resid, td); 864 if (error) 865 goto out; 866 867 ef->ddbsymcnt = symcnt / sizeof(Elf_Sym); 868 ef->ddbsymtab = (const Elf_Sym *)ef->symbase; 869 ef->ddbstrcnt = strcnt; 870 ef->ddbstrtab = ef->strbase; 871 872 error = link_elf_link_common_finish(lf); 873 if (error) 874 goto out; 875 876 nosyms: 877 878 *result = lf; 879 880 out: 881 if (error && lf) 882 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 883 if (shdr) 884 free(shdr, M_LINKER); 885 if (firstpage) 886 free(firstpage, M_LINKER); 887 VOP_UNLOCK(nd.ni_vp, 0); 888 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 889 VFS_UNLOCK_GIANT(vfslocked); 890 891 return error; 892 } 893 894 static void 895 link_elf_unload_file(linker_file_t file) 896 { 897 elf_file_t ef = (elf_file_t) file; 898 899 #ifdef GDB 900 if (ef->gdb.l_ld) { 901 GDB_STATE(RT_DELETE); 902 free((void *)(uintptr_t)ef->gdb.l_name, M_LINKER); 903 link_elf_delete_gdb(&ef->gdb); 904 GDB_STATE(RT_CONSISTENT); 905 } 906 #endif 907 908 /* Notify MD code that a module is being unloaded. */ 909 elf_cpu_unload_file(file); 910 911 if (ef->preloaded) { 912 link_elf_unload_preload(file); 913 return; 914 } 915 916 #ifdef SPARSE_MAPPING 917 if (ef->object) { 918 vm_map_remove(kernel_map, (vm_offset_t) ef->address, 919 (vm_offset_t) ef->address 920 + (ef->object->size << PAGE_SHIFT)); 921 } 922 #else 923 if (ef->address) 924 free(ef->address, M_LINKER); 925 #endif 926 if (ef->symbase) 927 free(ef->symbase, M_LINKER); 928 if (ef->strbase) 929 free(ef->strbase, M_LINKER); 930 if (ef->ctftab) 931 free(ef->ctftab, M_LINKER); 932 if (ef->ctfoff) 933 free(ef->ctfoff, M_LINKER); 934 if (ef->typoff) 935 free(ef->typoff, M_LINKER); 936 } 937 938 static void 939 link_elf_unload_preload(linker_file_t file) 940 { 941 if (file->filename) 942 preload_delete_name(file->filename); 943 } 944 945 static const char * 946 symbol_name(elf_file_t ef, Elf_Size r_info) 947 { 948 const Elf_Sym *ref; 949 950 if (ELF_R_SYM(r_info)) { 951 ref = ef->symtab + ELF_R_SYM(r_info); 952 return ef->strtab + ref->st_name; 953 } else 954 return NULL; 955 } 956 957 static int 958 relocate_file(elf_file_t ef) 959 { 960 const Elf_Rel *rellim; 961 const Elf_Rel *rel; 962 const Elf_Rela *relalim; 963 const Elf_Rela *rela; 964 const char *symname; 965 966 /* Perform relocations without addend if there are any: */ 967 rel = ef->rel; 968 if (rel) { 969 rellim = (const Elf_Rel *)((const char *)ef->rel + ef->relsize); 970 while (rel < rellim) { 971 if (elf_reloc(&ef->lf, (Elf_Addr)ef->address, rel, ELF_RELOC_REL, 972 elf_lookup)) { 973 symname = symbol_name(ef, rel->r_info); 974 printf("link_elf: symbol %s undefined\n", symname); 975 return ENOENT; 976 } 977 rel++; 978 } 979 } 980 981 /* Perform relocations with addend if there are any: */ 982 rela = ef->rela; 983 if (rela) { 984 relalim = (const Elf_Rela *)((const char *)ef->rela + ef->relasize); 985 while (rela < relalim) { 986 if (elf_reloc(&ef->lf, (Elf_Addr)ef->address, rela, ELF_RELOC_RELA, 987 elf_lookup)) { 988 symname = symbol_name(ef, rela->r_info); 989 printf("link_elf: symbol %s undefined\n", symname); 990 return ENOENT; 991 } 992 rela++; 993 } 994 } 995 996 /* Perform PLT relocations without addend if there are any: */ 997 rel = ef->pltrel; 998 if (rel) { 999 rellim = (const Elf_Rel *)((const char *)ef->pltrel + ef->pltrelsize); 1000 while (rel < rellim) { 1001 if (elf_reloc(&ef->lf, (Elf_Addr)ef->address, rel, ELF_RELOC_REL, 1002 elf_lookup)) { 1003 symname = symbol_name(ef, rel->r_info); 1004 printf("link_elf: symbol %s undefined\n", symname); 1005 return ENOENT; 1006 } 1007 rel++; 1008 } 1009 } 1010 1011 /* Perform relocations with addend if there are any: */ 1012 rela = ef->pltrela; 1013 if (rela) { 1014 relalim = (const Elf_Rela *)((const char *)ef->pltrela + ef->pltrelasize); 1015 while (rela < relalim) { 1016 if (elf_reloc(&ef->lf, (Elf_Addr)ef->address, rela, ELF_RELOC_RELA, 1017 elf_lookup)) { 1018 symname = symbol_name(ef, rela->r_info); 1019 printf("link_elf: symbol %s undefined\n", symname); 1020 return ENOENT; 1021 } 1022 rela++; 1023 } 1024 } 1025 1026 return 0; 1027 } 1028 1029 /* 1030 * Hash function for symbol table lookup. Don't even think about changing 1031 * this. It is specified by the System V ABI. 1032 */ 1033 static unsigned long 1034 elf_hash(const char *name) 1035 { 1036 const unsigned char *p = (const unsigned char *) name; 1037 unsigned long h = 0; 1038 unsigned long g; 1039 1040 while (*p != '\0') { 1041 h = (h << 4) + *p++; 1042 if ((g = h & 0xf0000000) != 0) 1043 h ^= g >> 24; 1044 h &= ~g; 1045 } 1046 return h; 1047 } 1048 1049 static int 1050 link_elf_lookup_symbol(linker_file_t lf, const char* name, c_linker_sym_t* sym) 1051 { 1052 elf_file_t ef = (elf_file_t) lf; 1053 unsigned long symnum; 1054 const Elf_Sym* symp; 1055 const char *strp; 1056 unsigned long hash; 1057 int i; 1058 1059 /* If we don't have a hash, bail. */ 1060 if (ef->buckets == NULL || ef->nbuckets == 0) { 1061 printf("link_elf_lookup_symbol: missing symbol hash table\n"); 1062 return ENOENT; 1063 } 1064 1065 /* First, search hashed global symbols */ 1066 hash = elf_hash(name); 1067 symnum = ef->buckets[hash % ef->nbuckets]; 1068 1069 while (symnum != STN_UNDEF) { 1070 if (symnum >= ef->nchains) { 1071 printf("link_elf_lookup_symbol: corrupt symbol table\n"); 1072 return ENOENT; 1073 } 1074 1075 symp = ef->symtab + symnum; 1076 if (symp->st_name == 0) { 1077 printf("link_elf_lookup_symbol: corrupt symbol table\n"); 1078 return ENOENT; 1079 } 1080 1081 strp = ef->strtab + symp->st_name; 1082 1083 if (strcmp(name, strp) == 0) { 1084 if (symp->st_shndx != SHN_UNDEF || 1085 (symp->st_value != 0 && 1086 ELF_ST_TYPE(symp->st_info) == STT_FUNC)) { 1087 *sym = (c_linker_sym_t) symp; 1088 return 0; 1089 } else 1090 return ENOENT; 1091 } 1092 1093 symnum = ef->chains[symnum]; 1094 } 1095 1096 /* If we have not found it, look at the full table (if loaded) */ 1097 if (ef->symtab == ef->ddbsymtab) 1098 return ENOENT; 1099 1100 /* Exhaustive search */ 1101 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1102 strp = ef->ddbstrtab + symp->st_name; 1103 if (strcmp(name, strp) == 0) { 1104 if (symp->st_shndx != SHN_UNDEF || 1105 (symp->st_value != 0 && 1106 ELF_ST_TYPE(symp->st_info) == STT_FUNC)) { 1107 *sym = (c_linker_sym_t) symp; 1108 return 0; 1109 } else 1110 return ENOENT; 1111 } 1112 } 1113 1114 return ENOENT; 1115 } 1116 1117 static int 1118 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym, linker_symval_t* symval) 1119 { 1120 elf_file_t ef = (elf_file_t) lf; 1121 const Elf_Sym* es = (const Elf_Sym*) sym; 1122 1123 if (es >= ef->symtab && es < (ef->symtab + ef->nchains)) { 1124 symval->name = ef->strtab + es->st_name; 1125 symval->value = (caddr_t) ef->address + es->st_value; 1126 symval->size = es->st_size; 1127 return 0; 1128 } 1129 if (ef->symtab == ef->ddbsymtab) 1130 return ENOENT; 1131 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) { 1132 symval->name = ef->ddbstrtab + es->st_name; 1133 symval->value = (caddr_t) ef->address + es->st_value; 1134 symval->size = es->st_size; 1135 return 0; 1136 } 1137 return ENOENT; 1138 } 1139 1140 static int 1141 link_elf_search_symbol(linker_file_t lf, caddr_t value, 1142 c_linker_sym_t* sym, long* diffp) 1143 { 1144 elf_file_t ef = (elf_file_t) lf; 1145 u_long off = (uintptr_t) (void *) value; 1146 u_long diff = off; 1147 u_long st_value; 1148 const Elf_Sym* es; 1149 const Elf_Sym* best = 0; 1150 int i; 1151 1152 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) { 1153 if (es->st_name == 0) 1154 continue; 1155 st_value = es->st_value + (uintptr_t) (void *) ef->address; 1156 if (off >= st_value) { 1157 if (off - st_value < diff) { 1158 diff = off - st_value; 1159 best = es; 1160 if (diff == 0) 1161 break; 1162 } else if (off - st_value == diff) { 1163 best = es; 1164 } 1165 } 1166 } 1167 if (best == 0) 1168 *diffp = off; 1169 else 1170 *diffp = diff; 1171 *sym = (c_linker_sym_t) best; 1172 1173 return 0; 1174 } 1175 1176 /* 1177 * Look up a linker set on an ELF system. 1178 */ 1179 static int 1180 link_elf_lookup_set(linker_file_t lf, const char *name, 1181 void ***startp, void ***stopp, int *countp) 1182 { 1183 c_linker_sym_t sym; 1184 linker_symval_t symval; 1185 char *setsym; 1186 void **start, **stop; 1187 int len, error = 0, count; 1188 1189 len = strlen(name) + sizeof("__start_set_"); /* sizeof includes \0 */ 1190 setsym = malloc(len, M_LINKER, M_WAITOK); 1191 if (setsym == NULL) 1192 return ENOMEM; 1193 1194 /* get address of first entry */ 1195 snprintf(setsym, len, "%s%s", "__start_set_", name); 1196 error = link_elf_lookup_symbol(lf, setsym, &sym); 1197 if (error) 1198 goto out; 1199 link_elf_symbol_values(lf, sym, &symval); 1200 if (symval.value == 0) { 1201 error = ESRCH; 1202 goto out; 1203 } 1204 start = (void **)symval.value; 1205 1206 /* get address of last entry */ 1207 snprintf(setsym, len, "%s%s", "__stop_set_", name); 1208 error = link_elf_lookup_symbol(lf, setsym, &sym); 1209 if (error) 1210 goto out; 1211 link_elf_symbol_values(lf, sym, &symval); 1212 if (symval.value == 0) { 1213 error = ESRCH; 1214 goto out; 1215 } 1216 stop = (void **)symval.value; 1217 1218 /* and the number of entries */ 1219 count = stop - start; 1220 1221 /* and copy out */ 1222 if (startp) 1223 *startp = start; 1224 if (stopp) 1225 *stopp = stop; 1226 if (countp) 1227 *countp = count; 1228 1229 out: 1230 free(setsym, M_LINKER); 1231 return error; 1232 } 1233 1234 static int 1235 link_elf_each_function_name(linker_file_t file, 1236 int (*callback)(const char *, void *), void *opaque) { 1237 elf_file_t ef = (elf_file_t)file; 1238 const Elf_Sym* symp; 1239 int i, error; 1240 1241 /* Exhaustive search */ 1242 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1243 if (symp->st_value != 0 && 1244 ELF_ST_TYPE(symp->st_info) == STT_FUNC) { 1245 error = callback(ef->ddbstrtab + symp->st_name, opaque); 1246 if (error) 1247 return (error); 1248 } 1249 } 1250 return (0); 1251 } 1252 1253 static int 1254 link_elf_each_function_nameval(linker_file_t file, 1255 linker_function_nameval_callback_t callback, void *opaque) 1256 { 1257 linker_symval_t symval; 1258 elf_file_t ef = (elf_file_t)file; 1259 const Elf_Sym* symp; 1260 int i, error; 1261 1262 /* Exhaustive search */ 1263 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1264 if (symp->st_value != 0 && 1265 ELF_ST_TYPE(symp->st_info) == STT_FUNC) { 1266 error = link_elf_symbol_values(file, (c_linker_sym_t) symp, &symval); 1267 if (error) 1268 return (error); 1269 error = callback(file, i, &symval, opaque); 1270 if (error) 1271 return (error); 1272 } 1273 } 1274 return (0); 1275 } 1276 1277 #ifdef __ia64__ 1278 /* 1279 * Each KLD has its own GP. The GP value for each load module is given by 1280 * DT_PLTGOT on ia64. We need GP to construct function descriptors, but 1281 * don't have direct access to the ELF file structure. The link_elf_get_gp() 1282 * function returns the GP given a pointer to a generic linker file struct. 1283 */ 1284 Elf_Addr 1285 link_elf_get_gp(linker_file_t lf) 1286 { 1287 elf_file_t ef = (elf_file_t)lf; 1288 return (Elf_Addr)ef->got; 1289 } 1290 #endif 1291 1292 const Elf_Sym * 1293 elf_get_sym(linker_file_t lf, Elf_Size symidx) 1294 { 1295 elf_file_t ef = (elf_file_t)lf; 1296 1297 if (symidx >= ef->nchains) 1298 return (NULL); 1299 return (ef->symtab + symidx); 1300 } 1301 1302 const char * 1303 elf_get_symname(linker_file_t lf, Elf_Size symidx) 1304 { 1305 elf_file_t ef = (elf_file_t)lf; 1306 const Elf_Sym *sym; 1307 1308 if (symidx >= ef->nchains) 1309 return (NULL); 1310 sym = ef->symtab + symidx; 1311 return (ef->strtab + sym->st_name); 1312 } 1313 1314 /* 1315 * Symbol lookup function that can be used when the symbol index is known (ie 1316 * in relocations). It uses the symbol index instead of doing a fully fledged 1317 * hash table based lookup when such is valid. For example for local symbols. 1318 * This is not only more efficient, it's also more correct. It's not always 1319 * the case that the symbol can be found through the hash table. 1320 */ 1321 static Elf_Addr 1322 elf_lookup(linker_file_t lf, Elf_Size symidx, int deps) 1323 { 1324 elf_file_t ef = (elf_file_t)lf; 1325 const Elf_Sym *sym; 1326 const char *symbol; 1327 1328 /* Don't even try to lookup the symbol if the index is bogus. */ 1329 if (symidx >= ef->nchains) 1330 return (0); 1331 1332 sym = ef->symtab + symidx; 1333 1334 /* 1335 * Don't do a full lookup when the symbol is local. It may even 1336 * fail because it may not be found through the hash table. 1337 */ 1338 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) { 1339 /* Force lookup failure when we have an insanity. */ 1340 if (sym->st_shndx == SHN_UNDEF || sym->st_value == 0) 1341 return (0); 1342 return ((Elf_Addr)ef->address + sym->st_value); 1343 } 1344 1345 /* 1346 * XXX we can avoid doing a hash table based lookup for global 1347 * symbols as well. This however is not always valid, so we'll 1348 * just do it the hard way for now. Performance tweaks can 1349 * always be added. 1350 */ 1351 1352 symbol = ef->strtab + sym->st_name; 1353 1354 /* Force a lookup failure if the symbol name is bogus. */ 1355 if (*symbol == 0) 1356 return (0); 1357 1358 return ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps)); 1359 } 1360 1361 static void 1362 link_elf_reloc_local(linker_file_t lf) 1363 { 1364 const Elf_Rel *rellim; 1365 const Elf_Rel *rel; 1366 const Elf_Rela *relalim; 1367 const Elf_Rela *rela; 1368 elf_file_t ef = (elf_file_t)lf; 1369 1370 /* Perform relocations without addend if there are any: */ 1371 if ((rel = ef->rel) != NULL) { 1372 rellim = (const Elf_Rel *)((const char *)ef->rel + ef->relsize); 1373 while (rel < rellim) { 1374 elf_reloc_local(lf, (Elf_Addr)ef->address, rel, ELF_RELOC_REL, 1375 elf_lookup); 1376 rel++; 1377 } 1378 } 1379 1380 /* Perform relocations with addend if there are any: */ 1381 if ((rela = ef->rela) != NULL) { 1382 relalim = (const Elf_Rela *)((const char *)ef->rela + ef->relasize); 1383 while (rela < relalim) { 1384 elf_reloc_local(lf, (Elf_Addr)ef->address, rela, ELF_RELOC_RELA, 1385 elf_lookup); 1386 rela++; 1387 } 1388 } 1389 } 1390