1 /*- 2 * Copyright (c) 1998-2000 Doug Rabson 3 * Copyright (c) 2004 Peter Wemm 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include "opt_ddb.h" 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/lock.h> 37 #include <sys/malloc.h> 38 #include <sys/mutex.h> 39 #include <sys/mount.h> 40 #include <sys/proc.h> 41 #include <sys/namei.h> 42 #include <sys/fcntl.h> 43 #include <sys/vnode.h> 44 #include <sys/linker.h> 45 46 #include <machine/elf.h> 47 48 #include <net/vnet.h> 49 50 #include <security/mac/mac_framework.h> 51 52 #include <vm/vm.h> 53 #include <vm/vm_param.h> 54 #include <vm/vm_object.h> 55 #include <vm/vm_kern.h> 56 #include <vm/vm_extern.h> 57 #include <vm/pmap.h> 58 #include <vm/vm_map.h> 59 60 #include <sys/link_elf.h> 61 62 #ifdef DDB_CTF 63 #include <net/zlib.h> 64 #endif 65 66 #include "linker_if.h" 67 68 typedef struct { 69 void *addr; 70 Elf_Off size; 71 int flags; 72 int sec; /* Original section */ 73 char *name; 74 } Elf_progent; 75 76 typedef struct { 77 Elf_Rel *rel; 78 int nrel; 79 int sec; 80 } Elf_relent; 81 82 typedef struct { 83 Elf_Rela *rela; 84 int nrela; 85 int sec; 86 } Elf_relaent; 87 88 89 typedef struct elf_file { 90 struct linker_file lf; /* Common fields */ 91 92 int preloaded; 93 caddr_t address; /* Relocation address */ 94 vm_object_t object; /* VM object to hold file pages */ 95 Elf_Shdr *e_shdr; 96 97 Elf_progent *progtab; 98 int nprogtab; 99 100 Elf_relaent *relatab; 101 int nrelatab; 102 103 Elf_relent *reltab; 104 int nreltab; 105 106 Elf_Sym *ddbsymtab; /* The symbol table we are using */ 107 long ddbsymcnt; /* Number of symbols */ 108 caddr_t ddbstrtab; /* String table */ 109 long ddbstrcnt; /* number of bytes in string table */ 110 111 caddr_t shstrtab; /* Section name string table */ 112 long shstrcnt; /* number of bytes in string table */ 113 114 caddr_t ctftab; /* CTF table */ 115 long ctfcnt; /* number of bytes in CTF table */ 116 caddr_t ctfoff; /* CTF offset table */ 117 caddr_t typoff; /* Type offset table */ 118 long typlen; /* Number of type entries. */ 119 120 } *elf_file_t; 121 122 #include <kern/kern_ctf.c> 123 124 static int link_elf_link_preload(linker_class_t cls, 125 const char *, linker_file_t *); 126 static int link_elf_link_preload_finish(linker_file_t); 127 static int link_elf_load_file(linker_class_t, const char *, linker_file_t *); 128 static int link_elf_lookup_symbol(linker_file_t, const char *, 129 c_linker_sym_t *); 130 static int link_elf_symbol_values(linker_file_t, c_linker_sym_t, 131 linker_symval_t *); 132 static int link_elf_search_symbol(linker_file_t, caddr_t value, 133 c_linker_sym_t *sym, long *diffp); 134 135 static void link_elf_unload_file(linker_file_t); 136 static int link_elf_lookup_set(linker_file_t, const char *, 137 void ***, void ***, int *); 138 static int link_elf_each_function_name(linker_file_t, 139 int (*)(const char *, void *), void *); 140 static int link_elf_each_function_nameval(linker_file_t, 141 linker_function_nameval_callback_t, 142 void *); 143 static void link_elf_reloc_local(linker_file_t); 144 static long link_elf_symtab_get(linker_file_t, const Elf_Sym **); 145 static long link_elf_strtab_get(linker_file_t, caddr_t *); 146 147 static Elf_Addr elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps); 148 149 static kobj_method_t link_elf_methods[] = { 150 KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol), 151 KOBJMETHOD(linker_symbol_values, link_elf_symbol_values), 152 KOBJMETHOD(linker_search_symbol, link_elf_search_symbol), 153 KOBJMETHOD(linker_unload, link_elf_unload_file), 154 KOBJMETHOD(linker_load_file, link_elf_load_file), 155 KOBJMETHOD(linker_link_preload, link_elf_link_preload), 156 KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish), 157 KOBJMETHOD(linker_lookup_set, link_elf_lookup_set), 158 KOBJMETHOD(linker_each_function_name, link_elf_each_function_name), 159 KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval), 160 KOBJMETHOD(linker_ctf_get, link_elf_ctf_get), 161 KOBJMETHOD(linker_symtab_get, link_elf_symtab_get), 162 KOBJMETHOD(linker_strtab_get, link_elf_strtab_get), 163 { 0, 0 } 164 }; 165 166 static struct linker_class link_elf_class = { 167 #if ELF_TARG_CLASS == ELFCLASS32 168 "elf32_obj", 169 #else 170 "elf64_obj", 171 #endif 172 link_elf_methods, sizeof(struct elf_file) 173 }; 174 175 static int relocate_file(elf_file_t ef); 176 177 static void 178 link_elf_error(const char *filename, const char *s) 179 { 180 if (filename == NULL) 181 printf("kldload: %s\n", s); 182 else 183 printf("kldload: %s: %s\n", filename, s); 184 } 185 186 static void 187 link_elf_init(void *arg) 188 { 189 190 linker_add_class(&link_elf_class); 191 } 192 193 SYSINIT(link_elf_obj, SI_SUB_KLD, SI_ORDER_SECOND, link_elf_init, 0); 194 195 static int 196 link_elf_link_preload(linker_class_t cls, const char *filename, 197 linker_file_t *result) 198 { 199 Elf_Ehdr *hdr; 200 Elf_Shdr *shdr; 201 Elf_Sym *es; 202 void *modptr, *baseptr, *sizeptr; 203 char *type; 204 elf_file_t ef; 205 linker_file_t lf; 206 Elf_Addr off; 207 int error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex; 208 209 /* Look to see if we have the file preloaded */ 210 modptr = preload_search_by_name(filename); 211 if (modptr == NULL) 212 return ENOENT; 213 214 type = (char *)preload_search_info(modptr, MODINFO_TYPE); 215 baseptr = preload_search_info(modptr, MODINFO_ADDR); 216 sizeptr = preload_search_info(modptr, MODINFO_SIZE); 217 hdr = (Elf_Ehdr *)preload_search_info(modptr, MODINFO_METADATA | 218 MODINFOMD_ELFHDR); 219 shdr = (Elf_Shdr *)preload_search_info(modptr, MODINFO_METADATA | 220 MODINFOMD_SHDR); 221 if (type == NULL || (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE) 222 " obj module") != 0 && 223 strcmp(type, "elf obj module") != 0)) { 224 return (EFTYPE); 225 } 226 if (baseptr == NULL || sizeptr == NULL || hdr == NULL || 227 shdr == NULL) 228 return (EINVAL); 229 230 lf = linker_make_file(filename, &link_elf_class); 231 if (lf == NULL) 232 return (ENOMEM); 233 234 ef = (elf_file_t)lf; 235 ef->preloaded = 1; 236 ef->address = *(caddr_t *)baseptr; 237 lf->address = *(caddr_t *)baseptr; 238 lf->size = *(size_t *)sizeptr; 239 240 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 241 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 242 hdr->e_ident[EI_VERSION] != EV_CURRENT || 243 hdr->e_version != EV_CURRENT || 244 hdr->e_type != ET_REL || 245 hdr->e_machine != ELF_TARG_MACH) { 246 error = EFTYPE; 247 goto out; 248 } 249 ef->e_shdr = shdr; 250 251 /* Scan the section header for information and table sizing. */ 252 symtabindex = -1; 253 symstrindex = -1; 254 for (i = 0; i < hdr->e_shnum; i++) { 255 switch (shdr[i].sh_type) { 256 case SHT_PROGBITS: 257 case SHT_NOBITS: 258 ef->nprogtab++; 259 break; 260 case SHT_SYMTAB: 261 symtabindex = i; 262 symstrindex = shdr[i].sh_link; 263 break; 264 case SHT_REL: 265 ef->nreltab++; 266 break; 267 case SHT_RELA: 268 ef->nrelatab++; 269 break; 270 } 271 } 272 273 shstrindex = hdr->e_shstrndx; 274 if (ef->nprogtab == 0 || symstrindex < 0 || 275 symstrindex >= hdr->e_shnum || 276 shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 || 277 shstrindex >= hdr->e_shnum || 278 shdr[shstrindex].sh_type != SHT_STRTAB) { 279 printf("%s: bad/missing section headers\n", filename); 280 error = ENOEXEC; 281 goto out; 282 } 283 284 /* Allocate space for tracking the load chunks */ 285 if (ef->nprogtab != 0) 286 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab), 287 M_LINKER, M_WAITOK | M_ZERO); 288 if (ef->nreltab != 0) 289 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab), 290 M_LINKER, M_WAITOK | M_ZERO); 291 if (ef->nrelatab != 0) 292 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab), 293 M_LINKER, M_WAITOK | M_ZERO); 294 if ((ef->nprogtab != 0 && ef->progtab == NULL) || 295 (ef->nreltab != 0 && ef->reltab == NULL) || 296 (ef->nrelatab != 0 && ef->relatab == NULL)) { 297 error = ENOMEM; 298 goto out; 299 } 300 301 /* XXX, relocate the sh_addr fields saved by the loader. */ 302 off = 0; 303 for (i = 0; i < hdr->e_shnum; i++) { 304 if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off)) 305 off = shdr[i].sh_addr; 306 } 307 for (i = 0; i < hdr->e_shnum; i++) { 308 if (shdr[i].sh_addr != 0) 309 shdr[i].sh_addr = shdr[i].sh_addr - off + 310 (Elf_Addr)ef->address; 311 } 312 313 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym); 314 ef->ddbsymtab = (Elf_Sym *)shdr[symtabindex].sh_addr; 315 ef->ddbstrcnt = shdr[symstrindex].sh_size; 316 ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr; 317 ef->shstrcnt = shdr[shstrindex].sh_size; 318 ef->shstrtab = (char *)shdr[shstrindex].sh_addr; 319 320 /* Now fill out progtab and the relocation tables. */ 321 pb = 0; 322 rl = 0; 323 ra = 0; 324 for (i = 0; i < hdr->e_shnum; i++) { 325 switch (shdr[i].sh_type) { 326 case SHT_PROGBITS: 327 case SHT_NOBITS: 328 ef->progtab[pb].addr = (void *)shdr[i].sh_addr; 329 if (shdr[i].sh_type == SHT_PROGBITS) 330 ef->progtab[pb].name = "<<PROGBITS>>"; 331 else 332 ef->progtab[pb].name = "<<NOBITS>>"; 333 ef->progtab[pb].size = shdr[i].sh_size; 334 ef->progtab[pb].sec = i; 335 if (ef->shstrtab && shdr[i].sh_name != 0) 336 ef->progtab[pb].name = 337 ef->shstrtab + shdr[i].sh_name; 338 if (ef->progtab[pb].name != NULL && 339 !strcmp(ef->progtab[pb].name, "set_pcpu")) { 340 void *dpcpu; 341 342 dpcpu = dpcpu_alloc(shdr[i].sh_size); 343 if (dpcpu == NULL) { 344 error = ENOSPC; 345 goto out; 346 } 347 memcpy(dpcpu, ef->progtab[pb].addr, 348 ef->progtab[pb].size); 349 dpcpu_copy(dpcpu, shdr[i].sh_size); 350 ef->progtab[pb].addr = dpcpu; 351 #ifdef VIMAGE 352 } else if (ef->progtab[pb].name != NULL && 353 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) { 354 void *vnet_data; 355 356 vnet_data = vnet_data_alloc(shdr[i].sh_size); 357 if (vnet_data == NULL) { 358 error = ENOSPC; 359 goto out; 360 } 361 memcpy(vnet_data, ef->progtab[pb].addr, 362 ef->progtab[pb].size); 363 vnet_data_copy(vnet_data, shdr[i].sh_size); 364 ef->progtab[pb].addr = vnet_data; 365 #endif 366 } 367 368 /* Update all symbol values with the offset. */ 369 for (j = 0; j < ef->ddbsymcnt; j++) { 370 es = &ef->ddbsymtab[j]; 371 if (es->st_shndx != i) 372 continue; 373 es->st_value += (Elf_Addr)ef->progtab[pb].addr; 374 } 375 pb++; 376 break; 377 case SHT_REL: 378 ef->reltab[rl].rel = (Elf_Rel *)shdr[i].sh_addr; 379 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel); 380 ef->reltab[rl].sec = shdr[i].sh_info; 381 rl++; 382 break; 383 case SHT_RELA: 384 ef->relatab[ra].rela = (Elf_Rela *)shdr[i].sh_addr; 385 ef->relatab[ra].nrela = 386 shdr[i].sh_size / sizeof(Elf_Rela); 387 ef->relatab[ra].sec = shdr[i].sh_info; 388 ra++; 389 break; 390 } 391 } 392 if (pb != ef->nprogtab) 393 panic("lost progbits"); 394 if (rl != ef->nreltab) 395 panic("lost reltab"); 396 if (ra != ef->nrelatab) 397 panic("lost relatab"); 398 399 /* Local intra-module relocations */ 400 link_elf_reloc_local(lf); 401 402 *result = lf; 403 return (0); 404 405 out: 406 /* preload not done this way */ 407 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 408 return (error); 409 } 410 411 static int 412 link_elf_link_preload_finish(linker_file_t lf) 413 { 414 elf_file_t ef; 415 int error; 416 417 ef = (elf_file_t)lf; 418 error = relocate_file(ef); 419 if (error) 420 return error; 421 422 /* Notify MD code that a module is being loaded. */ 423 error = elf_cpu_load_file(lf); 424 if (error) 425 return (error); 426 427 return (0); 428 } 429 430 static int 431 link_elf_load_file(linker_class_t cls, const char *filename, 432 linker_file_t *result) 433 { 434 struct nameidata nd; 435 struct thread *td = curthread; /* XXX */ 436 Elf_Ehdr *hdr; 437 Elf_Shdr *shdr; 438 Elf_Sym *es; 439 int nbytes, i, j; 440 vm_offset_t mapbase; 441 size_t mapsize; 442 int error = 0; 443 int resid, flags; 444 elf_file_t ef; 445 linker_file_t lf; 446 int symtabindex; 447 int symstrindex; 448 int shstrindex; 449 int nsym; 450 int pb, rl, ra; 451 int alignmask; 452 int vfslocked; 453 454 shdr = NULL; 455 lf = NULL; 456 mapsize = 0; 457 hdr = NULL; 458 459 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_SYSSPACE, filename, td); 460 flags = FREAD; 461 error = vn_open(&nd, &flags, 0, NULL); 462 if (error) 463 return error; 464 vfslocked = NDHASGIANT(&nd); 465 NDFREE(&nd, NDF_ONLY_PNBUF); 466 if (nd.ni_vp->v_type != VREG) { 467 error = ENOEXEC; 468 goto out; 469 } 470 #ifdef MAC 471 error = mac_kld_check_load(td->td_ucred, nd.ni_vp); 472 if (error) { 473 goto out; 474 } 475 #endif 476 477 /* Read the elf header from the file. */ 478 hdr = malloc(sizeof(*hdr), M_LINKER, M_WAITOK); 479 if (hdr == NULL) { 480 error = ENOMEM; 481 goto out; 482 } 483 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)hdr, sizeof(*hdr), 0, 484 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 485 &resid, td); 486 if (error) 487 goto out; 488 if (resid != 0){ 489 error = ENOEXEC; 490 goto out; 491 } 492 493 if (!IS_ELF(*hdr)) { 494 error = ENOEXEC; 495 goto out; 496 } 497 498 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS 499 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) { 500 link_elf_error(filename, "Unsupported file layout"); 501 error = ENOEXEC; 502 goto out; 503 } 504 if (hdr->e_ident[EI_VERSION] != EV_CURRENT 505 || hdr->e_version != EV_CURRENT) { 506 link_elf_error(filename, "Unsupported file version"); 507 error = ENOEXEC; 508 goto out; 509 } 510 if (hdr->e_type != ET_REL) { 511 error = ENOSYS; 512 goto out; 513 } 514 if (hdr->e_machine != ELF_TARG_MACH) { 515 link_elf_error(filename, "Unsupported machine"); 516 error = ENOEXEC; 517 goto out; 518 } 519 520 lf = linker_make_file(filename, &link_elf_class); 521 if (!lf) { 522 error = ENOMEM; 523 goto out; 524 } 525 ef = (elf_file_t) lf; 526 ef->nprogtab = 0; 527 ef->e_shdr = 0; 528 ef->nreltab = 0; 529 ef->nrelatab = 0; 530 531 /* Allocate and read in the section header */ 532 nbytes = hdr->e_shnum * hdr->e_shentsize; 533 if (nbytes == 0 || hdr->e_shoff == 0 || 534 hdr->e_shentsize != sizeof(Elf_Shdr)) { 535 error = ENOEXEC; 536 goto out; 537 } 538 shdr = malloc(nbytes, M_LINKER, M_WAITOK); 539 if (shdr == NULL) { 540 error = ENOMEM; 541 goto out; 542 } 543 ef->e_shdr = shdr; 544 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shdr, nbytes, hdr->e_shoff, 545 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td); 546 if (error) 547 goto out; 548 if (resid) { 549 error = ENOEXEC; 550 goto out; 551 } 552 553 /* Scan the section header for information and table sizing. */ 554 nsym = 0; 555 symtabindex = -1; 556 symstrindex = -1; 557 for (i = 0; i < hdr->e_shnum; i++) { 558 switch (shdr[i].sh_type) { 559 case SHT_PROGBITS: 560 case SHT_NOBITS: 561 ef->nprogtab++; 562 break; 563 case SHT_SYMTAB: 564 nsym++; 565 symtabindex = i; 566 symstrindex = shdr[i].sh_link; 567 break; 568 case SHT_REL: 569 ef->nreltab++; 570 break; 571 case SHT_RELA: 572 ef->nrelatab++; 573 break; 574 case SHT_STRTAB: 575 break; 576 } 577 } 578 if (ef->nprogtab == 0) { 579 link_elf_error(filename, "file has no contents"); 580 error = ENOEXEC; 581 goto out; 582 } 583 if (nsym != 1) { 584 /* Only allow one symbol table for now */ 585 link_elf_error(filename, "file has no valid symbol table"); 586 error = ENOEXEC; 587 goto out; 588 } 589 if (symstrindex < 0 || symstrindex > hdr->e_shnum || 590 shdr[symstrindex].sh_type != SHT_STRTAB) { 591 link_elf_error(filename, "file has invalid symbol strings"); 592 error = ENOEXEC; 593 goto out; 594 } 595 596 /* Allocate space for tracking the load chunks */ 597 if (ef->nprogtab != 0) 598 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab), 599 M_LINKER, M_WAITOK | M_ZERO); 600 if (ef->nreltab != 0) 601 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab), 602 M_LINKER, M_WAITOK | M_ZERO); 603 if (ef->nrelatab != 0) 604 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab), 605 M_LINKER, M_WAITOK | M_ZERO); 606 if ((ef->nprogtab != 0 && ef->progtab == NULL) || 607 (ef->nreltab != 0 && ef->reltab == NULL) || 608 (ef->nrelatab != 0 && ef->relatab == NULL)) { 609 error = ENOMEM; 610 goto out; 611 } 612 613 if (symtabindex == -1) 614 panic("lost symbol table index"); 615 /* Allocate space for and load the symbol table */ 616 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym); 617 ef->ddbsymtab = malloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK); 618 if (ef->ddbsymtab == NULL) { 619 error = ENOMEM; 620 goto out; 621 } 622 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ef->ddbsymtab, 623 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset, 624 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 625 &resid, td); 626 if (error) 627 goto out; 628 if (resid != 0){ 629 error = EINVAL; 630 goto out; 631 } 632 633 if (symstrindex == -1) 634 panic("lost symbol string index"); 635 /* Allocate space for and load the symbol strings */ 636 ef->ddbstrcnt = shdr[symstrindex].sh_size; 637 ef->ddbstrtab = malloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK); 638 if (ef->ddbstrtab == NULL) { 639 error = ENOMEM; 640 goto out; 641 } 642 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->ddbstrtab, 643 shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset, 644 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 645 &resid, td); 646 if (error) 647 goto out; 648 if (resid != 0){ 649 error = EINVAL; 650 goto out; 651 } 652 653 /* Do we have a string table for the section names? */ 654 shstrindex = -1; 655 if (hdr->e_shstrndx != 0 && 656 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) { 657 shstrindex = hdr->e_shstrndx; 658 ef->shstrcnt = shdr[shstrindex].sh_size; 659 ef->shstrtab = malloc(shdr[shstrindex].sh_size, M_LINKER, 660 M_WAITOK); 661 if (ef->shstrtab == NULL) { 662 error = ENOMEM; 663 goto out; 664 } 665 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->shstrtab, 666 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset, 667 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 668 &resid, td); 669 if (error) 670 goto out; 671 if (resid != 0){ 672 error = EINVAL; 673 goto out; 674 } 675 } 676 677 /* Size up code/data(progbits) and bss(nobits). */ 678 alignmask = 0; 679 for (i = 0; i < hdr->e_shnum; i++) { 680 switch (shdr[i].sh_type) { 681 case SHT_PROGBITS: 682 case SHT_NOBITS: 683 alignmask = shdr[i].sh_addralign - 1; 684 mapsize += alignmask; 685 mapsize &= ~alignmask; 686 mapsize += shdr[i].sh_size; 687 break; 688 } 689 } 690 691 /* 692 * We know how much space we need for the text/data/bss/etc. 693 * This stuff needs to be in a single chunk so that profiling etc 694 * can get the bounds and gdb can associate offsets with modules 695 */ 696 ef->object = vm_object_allocate(OBJT_DEFAULT, 697 round_page(mapsize) >> PAGE_SHIFT); 698 if (ef->object == NULL) { 699 error = ENOMEM; 700 goto out; 701 } 702 ef->address = (caddr_t) vm_map_min(kernel_map); 703 704 /* 705 * In order to satisfy amd64's architectural requirements on the 706 * location of code and data in the kernel's address space, request a 707 * mapping that is above the kernel. 708 */ 709 mapbase = KERNBASE; 710 error = vm_map_find(kernel_map, ef->object, 0, &mapbase, 711 round_page(mapsize), TRUE, VM_PROT_ALL, VM_PROT_ALL, FALSE); 712 if (error) { 713 vm_object_deallocate(ef->object); 714 ef->object = 0; 715 goto out; 716 } 717 718 /* Wire the pages */ 719 error = vm_map_wire(kernel_map, mapbase, 720 mapbase + round_page(mapsize), 721 VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES); 722 if (error != KERN_SUCCESS) { 723 error = ENOMEM; 724 goto out; 725 } 726 727 /* Inform the kld system about the situation */ 728 lf->address = ef->address = (caddr_t)mapbase; 729 lf->size = mapsize; 730 731 /* 732 * Now load code/data(progbits), zero bss(nobits), allocate space for 733 * and load relocs 734 */ 735 pb = 0; 736 rl = 0; 737 ra = 0; 738 alignmask = 0; 739 for (i = 0; i < hdr->e_shnum; i++) { 740 switch (shdr[i].sh_type) { 741 case SHT_PROGBITS: 742 case SHT_NOBITS: 743 alignmask = shdr[i].sh_addralign - 1; 744 mapbase += alignmask; 745 mapbase &= ~alignmask; 746 if (ef->shstrtab && shdr[i].sh_name != 0) 747 ef->progtab[pb].name = 748 ef->shstrtab + shdr[i].sh_name; 749 else if (shdr[i].sh_type == SHT_PROGBITS) 750 ef->progtab[pb].name = "<<PROGBITS>>"; 751 else 752 ef->progtab[pb].name = "<<NOBITS>>"; 753 if (ef->progtab[pb].name != NULL && 754 !strcmp(ef->progtab[pb].name, "set_pcpu")) 755 ef->progtab[pb].addr = 756 dpcpu_alloc(shdr[i].sh_size); 757 #ifdef VIMAGE 758 else if (ef->progtab[pb].name != NULL && 759 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) 760 ef->progtab[pb].addr = 761 vnet_data_alloc(shdr[i].sh_size); 762 #endif 763 else 764 ef->progtab[pb].addr = 765 (void *)(uintptr_t)mapbase; 766 if (ef->progtab[pb].addr == NULL) { 767 error = ENOSPC; 768 goto out; 769 } 770 ef->progtab[pb].size = shdr[i].sh_size; 771 ef->progtab[pb].sec = i; 772 if (shdr[i].sh_type == SHT_PROGBITS) { 773 error = vn_rdwr(UIO_READ, nd.ni_vp, 774 ef->progtab[pb].addr, 775 shdr[i].sh_size, shdr[i].sh_offset, 776 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 777 NOCRED, &resid, td); 778 if (error) 779 goto out; 780 if (resid != 0){ 781 error = EINVAL; 782 goto out; 783 } 784 /* Initialize the per-cpu or vnet area. */ 785 if (ef->progtab[pb].addr != (void *)mapbase && 786 !strcmp(ef->progtab[pb].name, "set_pcpu")) 787 dpcpu_copy(ef->progtab[pb].addr, 788 shdr[i].sh_size); 789 #ifdef VIMAGE 790 else if (ef->progtab[pb].addr != 791 (void *)mapbase && 792 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) 793 vnet_data_copy(ef->progtab[pb].addr, 794 shdr[i].sh_size); 795 #endif 796 } else 797 bzero(ef->progtab[pb].addr, shdr[i].sh_size); 798 799 /* Update all symbol values with the offset. */ 800 for (j = 0; j < ef->ddbsymcnt; j++) { 801 es = &ef->ddbsymtab[j]; 802 if (es->st_shndx != i) 803 continue; 804 es->st_value += (Elf_Addr)ef->progtab[pb].addr; 805 } 806 mapbase += shdr[i].sh_size; 807 pb++; 808 break; 809 case SHT_REL: 810 ef->reltab[rl].rel = malloc(shdr[i].sh_size, M_LINKER, 811 M_WAITOK); 812 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel); 813 ef->reltab[rl].sec = shdr[i].sh_info; 814 error = vn_rdwr(UIO_READ, nd.ni_vp, 815 (void *)ef->reltab[rl].rel, 816 shdr[i].sh_size, shdr[i].sh_offset, 817 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 818 &resid, td); 819 if (error) 820 goto out; 821 if (resid != 0){ 822 error = EINVAL; 823 goto out; 824 } 825 rl++; 826 break; 827 case SHT_RELA: 828 ef->relatab[ra].rela = malloc(shdr[i].sh_size, M_LINKER, 829 M_WAITOK); 830 ef->relatab[ra].nrela = 831 shdr[i].sh_size / sizeof(Elf_Rela); 832 ef->relatab[ra].sec = shdr[i].sh_info; 833 error = vn_rdwr(UIO_READ, nd.ni_vp, 834 (void *)ef->relatab[ra].rela, 835 shdr[i].sh_size, shdr[i].sh_offset, 836 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 837 &resid, td); 838 if (error) 839 goto out; 840 if (resid != 0){ 841 error = EINVAL; 842 goto out; 843 } 844 ra++; 845 break; 846 } 847 } 848 if (pb != ef->nprogtab) 849 panic("lost progbits"); 850 if (rl != ef->nreltab) 851 panic("lost reltab"); 852 if (ra != ef->nrelatab) 853 panic("lost relatab"); 854 if (mapbase != (vm_offset_t)ef->address + mapsize) 855 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n", 856 (u_long)mapbase, ef->address, (u_long)mapsize, 857 (u_long)(vm_offset_t)ef->address + mapsize); 858 859 /* Local intra-module relocations */ 860 link_elf_reloc_local(lf); 861 862 /* Pull in dependencies */ 863 VOP_UNLOCK(nd.ni_vp, 0); 864 error = linker_load_dependencies(lf); 865 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 866 if (error) 867 goto out; 868 869 /* External relocations */ 870 error = relocate_file(ef); 871 if (error) 872 goto out; 873 874 /* Notify MD code that a module is being loaded. */ 875 error = elf_cpu_load_file(lf); 876 if (error) 877 goto out; 878 879 *result = lf; 880 881 out: 882 if (error && lf) 883 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 884 if (hdr) 885 free(hdr, M_LINKER); 886 VOP_UNLOCK(nd.ni_vp, 0); 887 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 888 VFS_UNLOCK_GIANT(vfslocked); 889 890 return error; 891 } 892 893 static void 894 link_elf_unload_file(linker_file_t file) 895 { 896 elf_file_t ef = (elf_file_t) file; 897 int i; 898 899 /* Notify MD code that a module is being unloaded. */ 900 elf_cpu_unload_file(file); 901 902 if (ef->progtab) { 903 for (i = 0; i < ef->nprogtab; i++) { 904 if (ef->progtab[i].size == 0) 905 continue; 906 if (ef->progtab[i].name == NULL) 907 continue; 908 if (!strcmp(ef->progtab[i].name, "set_pcpu")) 909 dpcpu_free(ef->progtab[i].addr, 910 ef->progtab[i].size); 911 #ifdef VIMAGE 912 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME)) 913 vnet_data_free(ef->progtab[i].addr, 914 ef->progtab[i].size); 915 #endif 916 } 917 } 918 if (ef->preloaded) { 919 if (ef->reltab) 920 free(ef->reltab, M_LINKER); 921 if (ef->relatab) 922 free(ef->relatab, M_LINKER); 923 if (ef->progtab) 924 free(ef->progtab, M_LINKER); 925 if (ef->ctftab) 926 free(ef->ctftab, M_LINKER); 927 if (ef->ctfoff) 928 free(ef->ctfoff, M_LINKER); 929 if (ef->typoff) 930 free(ef->typoff, M_LINKER); 931 if (file->filename != NULL) 932 preload_delete_name(file->filename); 933 /* XXX reclaim module memory? */ 934 return; 935 } 936 937 for (i = 0; i < ef->nreltab; i++) 938 if (ef->reltab[i].rel) 939 free(ef->reltab[i].rel, M_LINKER); 940 for (i = 0; i < ef->nrelatab; i++) 941 if (ef->relatab[i].rela) 942 free(ef->relatab[i].rela, M_LINKER); 943 if (ef->reltab) 944 free(ef->reltab, M_LINKER); 945 if (ef->relatab) 946 free(ef->relatab, M_LINKER); 947 if (ef->progtab) 948 free(ef->progtab, M_LINKER); 949 950 if (ef->object) { 951 vm_map_remove(kernel_map, (vm_offset_t) ef->address, 952 (vm_offset_t) ef->address + 953 (ef->object->size << PAGE_SHIFT)); 954 } 955 if (ef->e_shdr) 956 free(ef->e_shdr, M_LINKER); 957 if (ef->ddbsymtab) 958 free(ef->ddbsymtab, M_LINKER); 959 if (ef->ddbstrtab) 960 free(ef->ddbstrtab, M_LINKER); 961 if (ef->shstrtab) 962 free(ef->shstrtab, M_LINKER); 963 if (ef->ctftab) 964 free(ef->ctftab, M_LINKER); 965 if (ef->ctfoff) 966 free(ef->ctfoff, M_LINKER); 967 if (ef->typoff) 968 free(ef->typoff, M_LINKER); 969 } 970 971 static const char * 972 symbol_name(elf_file_t ef, Elf_Size r_info) 973 { 974 const Elf_Sym *ref; 975 976 if (ELF_R_SYM(r_info)) { 977 ref = ef->ddbsymtab + ELF_R_SYM(r_info); 978 return ef->ddbstrtab + ref->st_name; 979 } else 980 return NULL; 981 } 982 983 static Elf_Addr 984 findbase(elf_file_t ef, int sec) 985 { 986 int i; 987 Elf_Addr base = 0; 988 989 for (i = 0; i < ef->nprogtab; i++) { 990 if (sec == ef->progtab[i].sec) { 991 base = (Elf_Addr)ef->progtab[i].addr; 992 break; 993 } 994 } 995 return base; 996 } 997 998 static int 999 relocate_file(elf_file_t ef) 1000 { 1001 const Elf_Rel *rellim; 1002 const Elf_Rel *rel; 1003 const Elf_Rela *relalim; 1004 const Elf_Rela *rela; 1005 const char *symname; 1006 const Elf_Sym *sym; 1007 int i; 1008 Elf_Size symidx; 1009 Elf_Addr base; 1010 1011 1012 /* Perform relocations without addend if there are any: */ 1013 for (i = 0; i < ef->nreltab; i++) { 1014 rel = ef->reltab[i].rel; 1015 if (rel == NULL) 1016 panic("lost a reltab!"); 1017 rellim = rel + ef->reltab[i].nrel; 1018 base = findbase(ef, ef->reltab[i].sec); 1019 if (base == 0) 1020 panic("lost base for reltab"); 1021 for ( ; rel < rellim; rel++) { 1022 symidx = ELF_R_SYM(rel->r_info); 1023 if (symidx >= ef->ddbsymcnt) 1024 continue; 1025 sym = ef->ddbsymtab + symidx; 1026 /* Local relocs are already done */ 1027 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) 1028 continue; 1029 if (elf_reloc(&ef->lf, base, rel, ELF_RELOC_REL, 1030 elf_obj_lookup)) { 1031 symname = symbol_name(ef, rel->r_info); 1032 printf("link_elf_obj: symbol %s undefined\n", 1033 symname); 1034 return ENOENT; 1035 } 1036 } 1037 } 1038 1039 /* Perform relocations with addend if there are any: */ 1040 for (i = 0; i < ef->nrelatab; i++) { 1041 rela = ef->relatab[i].rela; 1042 if (rela == NULL) 1043 panic("lost a relatab!"); 1044 relalim = rela + ef->relatab[i].nrela; 1045 base = findbase(ef, ef->relatab[i].sec); 1046 if (base == 0) 1047 panic("lost base for relatab"); 1048 for ( ; rela < relalim; rela++) { 1049 symidx = ELF_R_SYM(rela->r_info); 1050 if (symidx >= ef->ddbsymcnt) 1051 continue; 1052 sym = ef->ddbsymtab + symidx; 1053 /* Local relocs are already done */ 1054 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) 1055 continue; 1056 if (elf_reloc(&ef->lf, base, rela, ELF_RELOC_RELA, 1057 elf_obj_lookup)) { 1058 symname = symbol_name(ef, rela->r_info); 1059 printf("link_elf_obj: symbol %s undefined\n", 1060 symname); 1061 return ENOENT; 1062 } 1063 } 1064 } 1065 1066 return 0; 1067 } 1068 1069 static int 1070 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym) 1071 { 1072 elf_file_t ef = (elf_file_t) lf; 1073 const Elf_Sym *symp; 1074 const char *strp; 1075 int i; 1076 1077 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1078 strp = ef->ddbstrtab + symp->st_name; 1079 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) { 1080 *sym = (c_linker_sym_t) symp; 1081 return 0; 1082 } 1083 } 1084 return ENOENT; 1085 } 1086 1087 static int 1088 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym, 1089 linker_symval_t *symval) 1090 { 1091 elf_file_t ef = (elf_file_t) lf; 1092 const Elf_Sym *es = (const Elf_Sym*) sym; 1093 1094 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) { 1095 symval->name = ef->ddbstrtab + es->st_name; 1096 symval->value = (caddr_t)es->st_value; 1097 symval->size = es->st_size; 1098 return 0; 1099 } 1100 return ENOENT; 1101 } 1102 1103 static int 1104 link_elf_search_symbol(linker_file_t lf, caddr_t value, 1105 c_linker_sym_t *sym, long *diffp) 1106 { 1107 elf_file_t ef = (elf_file_t) lf; 1108 u_long off = (uintptr_t) (void *) value; 1109 u_long diff = off; 1110 u_long st_value; 1111 const Elf_Sym *es; 1112 const Elf_Sym *best = 0; 1113 int i; 1114 1115 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) { 1116 if (es->st_name == 0) 1117 continue; 1118 st_value = es->st_value; 1119 if (off >= st_value) { 1120 if (off - st_value < diff) { 1121 diff = off - st_value; 1122 best = es; 1123 if (diff == 0) 1124 break; 1125 } else if (off - st_value == diff) { 1126 best = es; 1127 } 1128 } 1129 } 1130 if (best == 0) 1131 *diffp = off; 1132 else 1133 *diffp = diff; 1134 *sym = (c_linker_sym_t) best; 1135 1136 return 0; 1137 } 1138 1139 /* 1140 * Look up a linker set on an ELF system. 1141 */ 1142 static int 1143 link_elf_lookup_set(linker_file_t lf, const char *name, 1144 void ***startp, void ***stopp, int *countp) 1145 { 1146 elf_file_t ef = (elf_file_t)lf; 1147 void **start, **stop; 1148 int i, count; 1149 1150 /* Relative to section number */ 1151 for (i = 0; i < ef->nprogtab; i++) { 1152 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) && 1153 strcmp(ef->progtab[i].name + 4, name) == 0) { 1154 start = (void **)ef->progtab[i].addr; 1155 stop = (void **)((char *)ef->progtab[i].addr + 1156 ef->progtab[i].size); 1157 count = stop - start; 1158 if (startp) 1159 *startp = start; 1160 if (stopp) 1161 *stopp = stop; 1162 if (countp) 1163 *countp = count; 1164 return (0); 1165 } 1166 } 1167 return (ESRCH); 1168 } 1169 1170 static int 1171 link_elf_each_function_name(linker_file_t file, 1172 int (*callback)(const char *, void *), void *opaque) 1173 { 1174 elf_file_t ef = (elf_file_t)file; 1175 const Elf_Sym *symp; 1176 int i, error; 1177 1178 /* Exhaustive search */ 1179 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1180 if (symp->st_value != 0 && 1181 ELF_ST_TYPE(symp->st_info) == STT_FUNC) { 1182 error = callback(ef->ddbstrtab + symp->st_name, opaque); 1183 if (error) 1184 return (error); 1185 } 1186 } 1187 return (0); 1188 } 1189 1190 static int 1191 link_elf_each_function_nameval(linker_file_t file, 1192 linker_function_nameval_callback_t callback, void *opaque) 1193 { 1194 linker_symval_t symval; 1195 elf_file_t ef = (elf_file_t)file; 1196 const Elf_Sym* symp; 1197 int i, error; 1198 1199 /* Exhaustive search */ 1200 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1201 if (symp->st_value != 0 && 1202 ELF_ST_TYPE(symp->st_info) == STT_FUNC) { 1203 error = link_elf_symbol_values(file, (c_linker_sym_t) symp, &symval); 1204 if (error) 1205 return (error); 1206 error = callback(file, i, &symval, opaque); 1207 if (error) 1208 return (error); 1209 } 1210 } 1211 return (0); 1212 } 1213 1214 /* 1215 * Symbol lookup function that can be used when the symbol index is known (ie 1216 * in relocations). It uses the symbol index instead of doing a fully fledged 1217 * hash table based lookup when such is valid. For example for local symbols. 1218 * This is not only more efficient, it's also more correct. It's not always 1219 * the case that the symbol can be found through the hash table. 1220 */ 1221 static Elf_Addr 1222 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps) 1223 { 1224 elf_file_t ef = (elf_file_t)lf; 1225 const Elf_Sym *sym; 1226 const char *symbol; 1227 Elf_Addr ret; 1228 1229 /* Don't even try to lookup the symbol if the index is bogus. */ 1230 if (symidx >= ef->ddbsymcnt) 1231 return (0); 1232 1233 sym = ef->ddbsymtab + symidx; 1234 1235 /* Quick answer if there is a definition included. */ 1236 if (sym->st_shndx != SHN_UNDEF) 1237 return (sym->st_value); 1238 1239 /* If we get here, then it is undefined and needs a lookup. */ 1240 switch (ELF_ST_BIND(sym->st_info)) { 1241 case STB_LOCAL: 1242 /* Local, but undefined? huh? */ 1243 return (0); 1244 1245 case STB_GLOBAL: 1246 /* Relative to Data or Function name */ 1247 symbol = ef->ddbstrtab + sym->st_name; 1248 1249 /* Force a lookup failure if the symbol name is bogus. */ 1250 if (*symbol == 0) 1251 return (0); 1252 ret = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps)); 1253 return ret; 1254 1255 case STB_WEAK: 1256 printf("link_elf_obj: Weak symbols not supported\n"); 1257 return (0); 1258 1259 default: 1260 return (0); 1261 } 1262 } 1263 1264 static void 1265 link_elf_fix_link_set(elf_file_t ef) 1266 { 1267 static const char startn[] = "__start_"; 1268 static const char stopn[] = "__stop_"; 1269 Elf_Sym *sym; 1270 const char *sym_name, *linkset_name; 1271 Elf_Addr startp, stopp; 1272 Elf_Size symidx; 1273 int start, i; 1274 1275 startp = stopp = 0; 1276 for (symidx = 1 /* zero entry is special */; 1277 symidx < ef->ddbsymcnt; symidx++) { 1278 sym = ef->ddbsymtab + symidx; 1279 if (sym->st_shndx != SHN_UNDEF) 1280 continue; 1281 1282 sym_name = ef->ddbstrtab + sym->st_name; 1283 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) { 1284 start = 1; 1285 linkset_name = sym_name + sizeof(startn) - 1; 1286 } 1287 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) { 1288 start = 0; 1289 linkset_name = sym_name + sizeof(stopn) - 1; 1290 } 1291 else 1292 continue; 1293 1294 for (i = 0; i < ef->nprogtab; i++) { 1295 if (strcmp(ef->progtab[i].name, linkset_name) == 0) { 1296 startp = (Elf_Addr)ef->progtab[i].addr; 1297 stopp = (Elf_Addr)(startp + ef->progtab[i].size); 1298 break; 1299 } 1300 } 1301 if (i == ef->nprogtab) 1302 continue; 1303 1304 sym->st_value = start ? startp : stopp; 1305 sym->st_shndx = i; 1306 } 1307 } 1308 1309 static void 1310 link_elf_reloc_local(linker_file_t lf) 1311 { 1312 elf_file_t ef = (elf_file_t)lf; 1313 const Elf_Rel *rellim; 1314 const Elf_Rel *rel; 1315 const Elf_Rela *relalim; 1316 const Elf_Rela *rela; 1317 const Elf_Sym *sym; 1318 Elf_Addr base; 1319 int i; 1320 Elf_Size symidx; 1321 1322 link_elf_fix_link_set(ef); 1323 1324 /* Perform relocations without addend if there are any: */ 1325 for (i = 0; i < ef->nreltab; i++) { 1326 rel = ef->reltab[i].rel; 1327 if (rel == NULL) 1328 panic("lost a reltab!"); 1329 rellim = rel + ef->reltab[i].nrel; 1330 base = findbase(ef, ef->reltab[i].sec); 1331 if (base == 0) 1332 panic("lost base for reltab"); 1333 for ( ; rel < rellim; rel++) { 1334 symidx = ELF_R_SYM(rel->r_info); 1335 if (symidx >= ef->ddbsymcnt) 1336 continue; 1337 sym = ef->ddbsymtab + symidx; 1338 /* Only do local relocs */ 1339 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL) 1340 continue; 1341 elf_reloc_local(lf, base, rel, ELF_RELOC_REL, 1342 elf_obj_lookup); 1343 } 1344 } 1345 1346 /* Perform relocations with addend if there are any: */ 1347 for (i = 0; i < ef->nrelatab; i++) { 1348 rela = ef->relatab[i].rela; 1349 if (rela == NULL) 1350 panic("lost a relatab!"); 1351 relalim = rela + ef->relatab[i].nrela; 1352 base = findbase(ef, ef->relatab[i].sec); 1353 if (base == 0) 1354 panic("lost base for relatab"); 1355 for ( ; rela < relalim; rela++) { 1356 symidx = ELF_R_SYM(rela->r_info); 1357 if (symidx >= ef->ddbsymcnt) 1358 continue; 1359 sym = ef->ddbsymtab + symidx; 1360 /* Only do local relocs */ 1361 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL) 1362 continue; 1363 elf_reloc_local(lf, base, rela, ELF_RELOC_RELA, 1364 elf_obj_lookup); 1365 } 1366 } 1367 } 1368 1369 static long 1370 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab) 1371 { 1372 elf_file_t ef = (elf_file_t)lf; 1373 1374 *symtab = ef->ddbsymtab; 1375 1376 if (*symtab == NULL) 1377 return (0); 1378 1379 return (ef->ddbsymcnt); 1380 } 1381 1382 static long 1383 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab) 1384 { 1385 elf_file_t ef = (elf_file_t)lf; 1386 1387 *strtab = ef->ddbstrtab; 1388 1389 if (*strtab == NULL) 1390 return (0); 1391 1392 return (ef->ddbstrcnt); 1393 } 1394