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, DPCPU_SETNAME)) { 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 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)hdr, sizeof(*hdr), 0, 480 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 481 &resid, td); 482 if (error) 483 goto out; 484 if (resid != 0){ 485 error = ENOEXEC; 486 goto out; 487 } 488 489 if (!IS_ELF(*hdr)) { 490 error = ENOEXEC; 491 goto out; 492 } 493 494 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS 495 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) { 496 link_elf_error(filename, "Unsupported file layout"); 497 error = ENOEXEC; 498 goto out; 499 } 500 if (hdr->e_ident[EI_VERSION] != EV_CURRENT 501 || hdr->e_version != EV_CURRENT) { 502 link_elf_error(filename, "Unsupported file version"); 503 error = ENOEXEC; 504 goto out; 505 } 506 if (hdr->e_type != ET_REL) { 507 error = ENOSYS; 508 goto out; 509 } 510 if (hdr->e_machine != ELF_TARG_MACH) { 511 link_elf_error(filename, "Unsupported machine"); 512 error = ENOEXEC; 513 goto out; 514 } 515 516 lf = linker_make_file(filename, &link_elf_class); 517 if (!lf) { 518 error = ENOMEM; 519 goto out; 520 } 521 ef = (elf_file_t) lf; 522 ef->nprogtab = 0; 523 ef->e_shdr = 0; 524 ef->nreltab = 0; 525 ef->nrelatab = 0; 526 527 /* Allocate and read in the section header */ 528 nbytes = hdr->e_shnum * hdr->e_shentsize; 529 if (nbytes == 0 || hdr->e_shoff == 0 || 530 hdr->e_shentsize != sizeof(Elf_Shdr)) { 531 error = ENOEXEC; 532 goto out; 533 } 534 shdr = malloc(nbytes, M_LINKER, M_WAITOK); 535 ef->e_shdr = shdr; 536 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shdr, nbytes, hdr->e_shoff, 537 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td); 538 if (error) 539 goto out; 540 if (resid) { 541 error = ENOEXEC; 542 goto out; 543 } 544 545 /* Scan the section header for information and table sizing. */ 546 nsym = 0; 547 symtabindex = -1; 548 symstrindex = -1; 549 for (i = 0; i < hdr->e_shnum; i++) { 550 if (shdr[i].sh_size == 0) 551 continue; 552 switch (shdr[i].sh_type) { 553 case SHT_PROGBITS: 554 case SHT_NOBITS: 555 ef->nprogtab++; 556 break; 557 case SHT_SYMTAB: 558 nsym++; 559 symtabindex = i; 560 symstrindex = shdr[i].sh_link; 561 break; 562 case SHT_REL: 563 ef->nreltab++; 564 break; 565 case SHT_RELA: 566 ef->nrelatab++; 567 break; 568 case SHT_STRTAB: 569 break; 570 } 571 } 572 if (ef->nprogtab == 0) { 573 link_elf_error(filename, "file has no contents"); 574 error = ENOEXEC; 575 goto out; 576 } 577 if (nsym != 1) { 578 /* Only allow one symbol table for now */ 579 link_elf_error(filename, "file has no valid symbol table"); 580 error = ENOEXEC; 581 goto out; 582 } 583 if (symstrindex < 0 || symstrindex > hdr->e_shnum || 584 shdr[symstrindex].sh_type != SHT_STRTAB) { 585 link_elf_error(filename, "file has invalid symbol strings"); 586 error = ENOEXEC; 587 goto out; 588 } 589 590 /* Allocate space for tracking the load chunks */ 591 if (ef->nprogtab != 0) 592 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab), 593 M_LINKER, M_WAITOK | M_ZERO); 594 if (ef->nreltab != 0) 595 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab), 596 M_LINKER, M_WAITOK | M_ZERO); 597 if (ef->nrelatab != 0) 598 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab), 599 M_LINKER, M_WAITOK | M_ZERO); 600 601 if (symtabindex == -1) 602 panic("lost symbol table index"); 603 /* Allocate space for and load the symbol table */ 604 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym); 605 ef->ddbsymtab = malloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK); 606 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ef->ddbsymtab, 607 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset, 608 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 609 &resid, td); 610 if (error) 611 goto out; 612 if (resid != 0){ 613 error = EINVAL; 614 goto out; 615 } 616 617 if (symstrindex == -1) 618 panic("lost symbol string index"); 619 /* Allocate space for and load the symbol strings */ 620 ef->ddbstrcnt = shdr[symstrindex].sh_size; 621 ef->ddbstrtab = malloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK); 622 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->ddbstrtab, 623 shdr[symstrindex].sh_size, shdr[symstrindex].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 /* Do we have a string table for the section names? */ 634 shstrindex = -1; 635 if (hdr->e_shstrndx != 0 && 636 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) { 637 shstrindex = hdr->e_shstrndx; 638 ef->shstrcnt = shdr[shstrindex].sh_size; 639 ef->shstrtab = malloc(shdr[shstrindex].sh_size, M_LINKER, 640 M_WAITOK); 641 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->shstrtab, 642 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset, 643 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 644 &resid, td); 645 if (error) 646 goto out; 647 if (resid != 0){ 648 error = EINVAL; 649 goto out; 650 } 651 } 652 653 /* Size up code/data(progbits) and bss(nobits). */ 654 alignmask = 0; 655 for (i = 0; i < hdr->e_shnum; i++) { 656 if (shdr[i].sh_size == 0) 657 continue; 658 switch (shdr[i].sh_type) { 659 case SHT_PROGBITS: 660 case SHT_NOBITS: 661 alignmask = shdr[i].sh_addralign - 1; 662 mapsize += alignmask; 663 mapsize &= ~alignmask; 664 mapsize += shdr[i].sh_size; 665 break; 666 } 667 } 668 669 /* 670 * We know how much space we need for the text/data/bss/etc. 671 * This stuff needs to be in a single chunk so that profiling etc 672 * can get the bounds and gdb can associate offsets with modules 673 */ 674 ef->object = vm_object_allocate(OBJT_DEFAULT, 675 round_page(mapsize) >> PAGE_SHIFT); 676 if (ef->object == NULL) { 677 error = ENOMEM; 678 goto out; 679 } 680 ef->address = (caddr_t) vm_map_min(kernel_map); 681 682 /* 683 * In order to satisfy amd64's architectural requirements on the 684 * location of code and data in the kernel's address space, request a 685 * mapping that is above the kernel. 686 */ 687 #ifdef __amd64__ 688 mapbase = KERNBASE; 689 #else 690 mapbase = VM_MIN_KERNEL_ADDRESS; 691 #endif 692 error = vm_map_find(kernel_map, ef->object, 0, &mapbase, 693 round_page(mapsize), TRUE, VM_PROT_ALL, VM_PROT_ALL, FALSE); 694 if (error) { 695 vm_object_deallocate(ef->object); 696 ef->object = 0; 697 goto out; 698 } 699 700 /* Wire the pages */ 701 error = vm_map_wire(kernel_map, mapbase, 702 mapbase + round_page(mapsize), 703 VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES); 704 if (error != KERN_SUCCESS) { 705 error = ENOMEM; 706 goto out; 707 } 708 709 /* Inform the kld system about the situation */ 710 lf->address = ef->address = (caddr_t)mapbase; 711 lf->size = mapsize; 712 713 /* 714 * Now load code/data(progbits), zero bss(nobits), allocate space for 715 * and load relocs 716 */ 717 pb = 0; 718 rl = 0; 719 ra = 0; 720 alignmask = 0; 721 for (i = 0; i < hdr->e_shnum; i++) { 722 if (shdr[i].sh_size == 0) 723 continue; 724 switch (shdr[i].sh_type) { 725 case SHT_PROGBITS: 726 case SHT_NOBITS: 727 alignmask = shdr[i].sh_addralign - 1; 728 mapbase += alignmask; 729 mapbase &= ~alignmask; 730 if (ef->shstrtab && shdr[i].sh_name != 0) 731 ef->progtab[pb].name = 732 ef->shstrtab + shdr[i].sh_name; 733 else if (shdr[i].sh_type == SHT_PROGBITS) 734 ef->progtab[pb].name = "<<PROGBITS>>"; 735 else 736 ef->progtab[pb].name = "<<NOBITS>>"; 737 if (ef->progtab[pb].name != NULL && 738 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) 739 ef->progtab[pb].addr = 740 dpcpu_alloc(shdr[i].sh_size); 741 #ifdef VIMAGE 742 else if (ef->progtab[pb].name != NULL && 743 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) 744 ef->progtab[pb].addr = 745 vnet_data_alloc(shdr[i].sh_size); 746 #endif 747 else 748 ef->progtab[pb].addr = 749 (void *)(uintptr_t)mapbase; 750 if (ef->progtab[pb].addr == NULL) { 751 error = ENOSPC; 752 goto out; 753 } 754 ef->progtab[pb].size = shdr[i].sh_size; 755 ef->progtab[pb].sec = i; 756 if (shdr[i].sh_type == SHT_PROGBITS) { 757 error = vn_rdwr(UIO_READ, nd.ni_vp, 758 ef->progtab[pb].addr, 759 shdr[i].sh_size, shdr[i].sh_offset, 760 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 761 NOCRED, &resid, td); 762 if (error) 763 goto out; 764 if (resid != 0){ 765 error = EINVAL; 766 goto out; 767 } 768 /* Initialize the per-cpu or vnet area. */ 769 if (ef->progtab[pb].addr != (void *)mapbase && 770 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) 771 dpcpu_copy(ef->progtab[pb].addr, 772 shdr[i].sh_size); 773 #ifdef VIMAGE 774 else if (ef->progtab[pb].addr != 775 (void *)mapbase && 776 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) 777 vnet_data_copy(ef->progtab[pb].addr, 778 shdr[i].sh_size); 779 #endif 780 } else 781 bzero(ef->progtab[pb].addr, shdr[i].sh_size); 782 783 /* Update all symbol values with the offset. */ 784 for (j = 0; j < ef->ddbsymcnt; j++) { 785 es = &ef->ddbsymtab[j]; 786 if (es->st_shndx != i) 787 continue; 788 es->st_value += (Elf_Addr)ef->progtab[pb].addr; 789 } 790 mapbase += shdr[i].sh_size; 791 pb++; 792 break; 793 case SHT_REL: 794 ef->reltab[rl].rel = malloc(shdr[i].sh_size, M_LINKER, 795 M_WAITOK); 796 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel); 797 ef->reltab[rl].sec = shdr[i].sh_info; 798 error = vn_rdwr(UIO_READ, nd.ni_vp, 799 (void *)ef->reltab[rl].rel, 800 shdr[i].sh_size, shdr[i].sh_offset, 801 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 802 &resid, td); 803 if (error) 804 goto out; 805 if (resid != 0){ 806 error = EINVAL; 807 goto out; 808 } 809 rl++; 810 break; 811 case SHT_RELA: 812 ef->relatab[ra].rela = malloc(shdr[i].sh_size, M_LINKER, 813 M_WAITOK); 814 ef->relatab[ra].nrela = 815 shdr[i].sh_size / sizeof(Elf_Rela); 816 ef->relatab[ra].sec = shdr[i].sh_info; 817 error = vn_rdwr(UIO_READ, nd.ni_vp, 818 (void *)ef->relatab[ra].rela, 819 shdr[i].sh_size, shdr[i].sh_offset, 820 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 821 &resid, td); 822 if (error) 823 goto out; 824 if (resid != 0){ 825 error = EINVAL; 826 goto out; 827 } 828 ra++; 829 break; 830 } 831 } 832 if (pb != ef->nprogtab) 833 panic("lost progbits"); 834 if (rl != ef->nreltab) 835 panic("lost reltab"); 836 if (ra != ef->nrelatab) 837 panic("lost relatab"); 838 if (mapbase != (vm_offset_t)ef->address + mapsize) 839 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n", 840 (u_long)mapbase, ef->address, (u_long)mapsize, 841 (u_long)(vm_offset_t)ef->address + mapsize); 842 843 /* Local intra-module relocations */ 844 link_elf_reloc_local(lf); 845 846 /* Pull in dependencies */ 847 VOP_UNLOCK(nd.ni_vp, 0); 848 error = linker_load_dependencies(lf); 849 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 850 if (error) 851 goto out; 852 853 /* External relocations */ 854 error = relocate_file(ef); 855 if (error) 856 goto out; 857 858 /* Notify MD code that a module is being loaded. */ 859 error = elf_cpu_load_file(lf); 860 if (error) 861 goto out; 862 863 *result = lf; 864 865 out: 866 VOP_UNLOCK(nd.ni_vp, 0); 867 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 868 VFS_UNLOCK_GIANT(vfslocked); 869 if (error && lf) 870 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 871 if (hdr) 872 free(hdr, M_LINKER); 873 874 return error; 875 } 876 877 static void 878 link_elf_unload_file(linker_file_t file) 879 { 880 elf_file_t ef = (elf_file_t) file; 881 int i; 882 883 /* Notify MD code that a module is being unloaded. */ 884 elf_cpu_unload_file(file); 885 886 if (ef->progtab) { 887 for (i = 0; i < ef->nprogtab; i++) { 888 if (ef->progtab[i].size == 0) 889 continue; 890 if (ef->progtab[i].name == NULL) 891 continue; 892 if (!strcmp(ef->progtab[i].name, DPCPU_SETNAME)) 893 dpcpu_free(ef->progtab[i].addr, 894 ef->progtab[i].size); 895 #ifdef VIMAGE 896 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME)) 897 vnet_data_free(ef->progtab[i].addr, 898 ef->progtab[i].size); 899 #endif 900 } 901 } 902 if (ef->preloaded) { 903 if (ef->reltab) 904 free(ef->reltab, M_LINKER); 905 if (ef->relatab) 906 free(ef->relatab, M_LINKER); 907 if (ef->progtab) 908 free(ef->progtab, M_LINKER); 909 if (ef->ctftab) 910 free(ef->ctftab, M_LINKER); 911 if (ef->ctfoff) 912 free(ef->ctfoff, M_LINKER); 913 if (ef->typoff) 914 free(ef->typoff, M_LINKER); 915 if (file->filename != NULL) 916 preload_delete_name(file->filename); 917 /* XXX reclaim module memory? */ 918 return; 919 } 920 921 for (i = 0; i < ef->nreltab; i++) 922 if (ef->reltab[i].rel) 923 free(ef->reltab[i].rel, M_LINKER); 924 for (i = 0; i < ef->nrelatab; i++) 925 if (ef->relatab[i].rela) 926 free(ef->relatab[i].rela, M_LINKER); 927 if (ef->reltab) 928 free(ef->reltab, M_LINKER); 929 if (ef->relatab) 930 free(ef->relatab, M_LINKER); 931 if (ef->progtab) 932 free(ef->progtab, M_LINKER); 933 934 if (ef->object) { 935 vm_map_remove(kernel_map, (vm_offset_t) ef->address, 936 (vm_offset_t) ef->address + 937 (ef->object->size << PAGE_SHIFT)); 938 } 939 if (ef->e_shdr) 940 free(ef->e_shdr, M_LINKER); 941 if (ef->ddbsymtab) 942 free(ef->ddbsymtab, M_LINKER); 943 if (ef->ddbstrtab) 944 free(ef->ddbstrtab, M_LINKER); 945 if (ef->shstrtab) 946 free(ef->shstrtab, M_LINKER); 947 if (ef->ctftab) 948 free(ef->ctftab, M_LINKER); 949 if (ef->ctfoff) 950 free(ef->ctfoff, M_LINKER); 951 if (ef->typoff) 952 free(ef->typoff, M_LINKER); 953 } 954 955 static const char * 956 symbol_name(elf_file_t ef, Elf_Size r_info) 957 { 958 const Elf_Sym *ref; 959 960 if (ELF_R_SYM(r_info)) { 961 ref = ef->ddbsymtab + ELF_R_SYM(r_info); 962 return ef->ddbstrtab + ref->st_name; 963 } else 964 return NULL; 965 } 966 967 static Elf_Addr 968 findbase(elf_file_t ef, int sec) 969 { 970 int i; 971 Elf_Addr base = 0; 972 973 for (i = 0; i < ef->nprogtab; i++) { 974 if (sec == ef->progtab[i].sec) { 975 base = (Elf_Addr)ef->progtab[i].addr; 976 break; 977 } 978 } 979 return base; 980 } 981 982 static int 983 relocate_file(elf_file_t ef) 984 { 985 const Elf_Rel *rellim; 986 const Elf_Rel *rel; 987 const Elf_Rela *relalim; 988 const Elf_Rela *rela; 989 const char *symname; 990 const Elf_Sym *sym; 991 int i; 992 Elf_Size symidx; 993 Elf_Addr base; 994 995 996 /* Perform relocations without addend if there are any: */ 997 for (i = 0; i < ef->nreltab; i++) { 998 rel = ef->reltab[i].rel; 999 if (rel == NULL) 1000 panic("lost a reltab!"); 1001 rellim = rel + ef->reltab[i].nrel; 1002 base = findbase(ef, ef->reltab[i].sec); 1003 if (base == 0) 1004 panic("lost base for reltab"); 1005 for ( ; rel < rellim; rel++) { 1006 symidx = ELF_R_SYM(rel->r_info); 1007 if (symidx >= ef->ddbsymcnt) 1008 continue; 1009 sym = ef->ddbsymtab + symidx; 1010 /* Local relocs are already done */ 1011 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) 1012 continue; 1013 if (elf_reloc(&ef->lf, base, rel, ELF_RELOC_REL, 1014 elf_obj_lookup)) { 1015 symname = symbol_name(ef, rel->r_info); 1016 printf("link_elf_obj: symbol %s undefined\n", 1017 symname); 1018 return ENOENT; 1019 } 1020 } 1021 } 1022 1023 /* Perform relocations with addend if there are any: */ 1024 for (i = 0; i < ef->nrelatab; i++) { 1025 rela = ef->relatab[i].rela; 1026 if (rela == NULL) 1027 panic("lost a relatab!"); 1028 relalim = rela + ef->relatab[i].nrela; 1029 base = findbase(ef, ef->relatab[i].sec); 1030 if (base == 0) 1031 panic("lost base for relatab"); 1032 for ( ; rela < relalim; rela++) { 1033 symidx = ELF_R_SYM(rela->r_info); 1034 if (symidx >= ef->ddbsymcnt) 1035 continue; 1036 sym = ef->ddbsymtab + symidx; 1037 /* Local relocs are already done */ 1038 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) 1039 continue; 1040 if (elf_reloc(&ef->lf, base, rela, ELF_RELOC_RELA, 1041 elf_obj_lookup)) { 1042 symname = symbol_name(ef, rela->r_info); 1043 printf("link_elf_obj: symbol %s undefined\n", 1044 symname); 1045 return ENOENT; 1046 } 1047 } 1048 } 1049 1050 return 0; 1051 } 1052 1053 static int 1054 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym) 1055 { 1056 elf_file_t ef = (elf_file_t) lf; 1057 const Elf_Sym *symp; 1058 const char *strp; 1059 int i; 1060 1061 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1062 strp = ef->ddbstrtab + symp->st_name; 1063 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) { 1064 *sym = (c_linker_sym_t) symp; 1065 return 0; 1066 } 1067 } 1068 return ENOENT; 1069 } 1070 1071 static int 1072 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym, 1073 linker_symval_t *symval) 1074 { 1075 elf_file_t ef = (elf_file_t) lf; 1076 const Elf_Sym *es = (const Elf_Sym*) sym; 1077 1078 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) { 1079 symval->name = ef->ddbstrtab + es->st_name; 1080 symval->value = (caddr_t)es->st_value; 1081 symval->size = es->st_size; 1082 return 0; 1083 } 1084 return ENOENT; 1085 } 1086 1087 static int 1088 link_elf_search_symbol(linker_file_t lf, caddr_t value, 1089 c_linker_sym_t *sym, long *diffp) 1090 { 1091 elf_file_t ef = (elf_file_t) lf; 1092 u_long off = (uintptr_t) (void *) value; 1093 u_long diff = off; 1094 u_long st_value; 1095 const Elf_Sym *es; 1096 const Elf_Sym *best = 0; 1097 int i; 1098 1099 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) { 1100 if (es->st_name == 0) 1101 continue; 1102 st_value = es->st_value; 1103 if (off >= st_value) { 1104 if (off - st_value < diff) { 1105 diff = off - st_value; 1106 best = es; 1107 if (diff == 0) 1108 break; 1109 } else if (off - st_value == diff) { 1110 best = es; 1111 } 1112 } 1113 } 1114 if (best == 0) 1115 *diffp = off; 1116 else 1117 *diffp = diff; 1118 *sym = (c_linker_sym_t) best; 1119 1120 return 0; 1121 } 1122 1123 /* 1124 * Look up a linker set on an ELF system. 1125 */ 1126 static int 1127 link_elf_lookup_set(linker_file_t lf, const char *name, 1128 void ***startp, void ***stopp, int *countp) 1129 { 1130 elf_file_t ef = (elf_file_t)lf; 1131 void **start, **stop; 1132 int i, count; 1133 1134 /* Relative to section number */ 1135 for (i = 0; i < ef->nprogtab; i++) { 1136 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) && 1137 strcmp(ef->progtab[i].name + 4, name) == 0) { 1138 start = (void **)ef->progtab[i].addr; 1139 stop = (void **)((char *)ef->progtab[i].addr + 1140 ef->progtab[i].size); 1141 count = stop - start; 1142 if (startp) 1143 *startp = start; 1144 if (stopp) 1145 *stopp = stop; 1146 if (countp) 1147 *countp = count; 1148 return (0); 1149 } 1150 } 1151 return (ESRCH); 1152 } 1153 1154 static int 1155 link_elf_each_function_name(linker_file_t file, 1156 int (*callback)(const char *, void *), void *opaque) 1157 { 1158 elf_file_t ef = (elf_file_t)file; 1159 const Elf_Sym *symp; 1160 int i, error; 1161 1162 /* Exhaustive search */ 1163 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1164 if (symp->st_value != 0 && 1165 ELF_ST_TYPE(symp->st_info) == STT_FUNC) { 1166 error = callback(ef->ddbstrtab + symp->st_name, opaque); 1167 if (error) 1168 return (error); 1169 } 1170 } 1171 return (0); 1172 } 1173 1174 static int 1175 link_elf_each_function_nameval(linker_file_t file, 1176 linker_function_nameval_callback_t callback, void *opaque) 1177 { 1178 linker_symval_t symval; 1179 elf_file_t ef = (elf_file_t)file; 1180 const Elf_Sym* symp; 1181 int i, error; 1182 1183 /* Exhaustive search */ 1184 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1185 if (symp->st_value != 0 && 1186 ELF_ST_TYPE(symp->st_info) == STT_FUNC) { 1187 error = link_elf_symbol_values(file, (c_linker_sym_t) symp, &symval); 1188 if (error) 1189 return (error); 1190 error = callback(file, i, &symval, opaque); 1191 if (error) 1192 return (error); 1193 } 1194 } 1195 return (0); 1196 } 1197 1198 /* 1199 * Symbol lookup function that can be used when the symbol index is known (ie 1200 * in relocations). It uses the symbol index instead of doing a fully fledged 1201 * hash table based lookup when such is valid. For example for local symbols. 1202 * This is not only more efficient, it's also more correct. It's not always 1203 * the case that the symbol can be found through the hash table. 1204 */ 1205 static Elf_Addr 1206 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps) 1207 { 1208 elf_file_t ef = (elf_file_t)lf; 1209 const Elf_Sym *sym; 1210 const char *symbol; 1211 Elf_Addr ret; 1212 1213 /* Don't even try to lookup the symbol if the index is bogus. */ 1214 if (symidx >= ef->ddbsymcnt) 1215 return (0); 1216 1217 sym = ef->ddbsymtab + symidx; 1218 1219 /* Quick answer if there is a definition included. */ 1220 if (sym->st_shndx != SHN_UNDEF) 1221 return (sym->st_value); 1222 1223 /* If we get here, then it is undefined and needs a lookup. */ 1224 switch (ELF_ST_BIND(sym->st_info)) { 1225 case STB_LOCAL: 1226 /* Local, but undefined? huh? */ 1227 return (0); 1228 1229 case STB_GLOBAL: 1230 /* Relative to Data or Function name */ 1231 symbol = ef->ddbstrtab + sym->st_name; 1232 1233 /* Force a lookup failure if the symbol name is bogus. */ 1234 if (*symbol == 0) 1235 return (0); 1236 ret = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps)); 1237 return ret; 1238 1239 case STB_WEAK: 1240 printf("link_elf_obj: Weak symbols not supported\n"); 1241 return (0); 1242 1243 default: 1244 return (0); 1245 } 1246 } 1247 1248 static void 1249 link_elf_fix_link_set(elf_file_t ef) 1250 { 1251 static const char startn[] = "__start_"; 1252 static const char stopn[] = "__stop_"; 1253 Elf_Sym *sym; 1254 const char *sym_name, *linkset_name; 1255 Elf_Addr startp, stopp; 1256 Elf_Size symidx; 1257 int start, i; 1258 1259 startp = stopp = 0; 1260 for (symidx = 1 /* zero entry is special */; 1261 symidx < ef->ddbsymcnt; symidx++) { 1262 sym = ef->ddbsymtab + symidx; 1263 if (sym->st_shndx != SHN_UNDEF) 1264 continue; 1265 1266 sym_name = ef->ddbstrtab + sym->st_name; 1267 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) { 1268 start = 1; 1269 linkset_name = sym_name + sizeof(startn) - 1; 1270 } 1271 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) { 1272 start = 0; 1273 linkset_name = sym_name + sizeof(stopn) - 1; 1274 } 1275 else 1276 continue; 1277 1278 for (i = 0; i < ef->nprogtab; i++) { 1279 if (strcmp(ef->progtab[i].name, linkset_name) == 0) { 1280 startp = (Elf_Addr)ef->progtab[i].addr; 1281 stopp = (Elf_Addr)(startp + ef->progtab[i].size); 1282 break; 1283 } 1284 } 1285 if (i == ef->nprogtab) 1286 continue; 1287 1288 sym->st_value = start ? startp : stopp; 1289 sym->st_shndx = i; 1290 } 1291 } 1292 1293 static void 1294 link_elf_reloc_local(linker_file_t lf) 1295 { 1296 elf_file_t ef = (elf_file_t)lf; 1297 const Elf_Rel *rellim; 1298 const Elf_Rel *rel; 1299 const Elf_Rela *relalim; 1300 const Elf_Rela *rela; 1301 const Elf_Sym *sym; 1302 Elf_Addr base; 1303 int i; 1304 Elf_Size symidx; 1305 1306 link_elf_fix_link_set(ef); 1307 1308 /* Perform relocations without addend if there are any: */ 1309 for (i = 0; i < ef->nreltab; i++) { 1310 rel = ef->reltab[i].rel; 1311 if (rel == NULL) 1312 panic("lost a reltab!"); 1313 rellim = rel + ef->reltab[i].nrel; 1314 base = findbase(ef, ef->reltab[i].sec); 1315 if (base == 0) 1316 panic("lost base for reltab"); 1317 for ( ; rel < rellim; rel++) { 1318 symidx = ELF_R_SYM(rel->r_info); 1319 if (symidx >= ef->ddbsymcnt) 1320 continue; 1321 sym = ef->ddbsymtab + symidx; 1322 /* Only do local relocs */ 1323 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL) 1324 continue; 1325 elf_reloc_local(lf, base, rel, ELF_RELOC_REL, 1326 elf_obj_lookup); 1327 } 1328 } 1329 1330 /* Perform relocations with addend if there are any: */ 1331 for (i = 0; i < ef->nrelatab; i++) { 1332 rela = ef->relatab[i].rela; 1333 if (rela == NULL) 1334 panic("lost a relatab!"); 1335 relalim = rela + ef->relatab[i].nrela; 1336 base = findbase(ef, ef->relatab[i].sec); 1337 if (base == 0) 1338 panic("lost base for relatab"); 1339 for ( ; rela < relalim; rela++) { 1340 symidx = ELF_R_SYM(rela->r_info); 1341 if (symidx >= ef->ddbsymcnt) 1342 continue; 1343 sym = ef->ddbsymtab + symidx; 1344 /* Only do local relocs */ 1345 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL) 1346 continue; 1347 elf_reloc_local(lf, base, rela, ELF_RELOC_RELA, 1348 elf_obj_lookup); 1349 } 1350 } 1351 } 1352 1353 static long 1354 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab) 1355 { 1356 elf_file_t ef = (elf_file_t)lf; 1357 1358 *symtab = ef->ddbsymtab; 1359 1360 if (*symtab == NULL) 1361 return (0); 1362 1363 return (ef->ddbsymcnt); 1364 } 1365 1366 static long 1367 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab) 1368 { 1369 elf_file_t ef = (elf_file_t)lf; 1370 1371 *strtab = ef->ddbstrtab; 1372 1373 if (*strtab == NULL) 1374 return (0); 1375 1376 return (ef->ddbstrcnt); 1377 } 1378