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 ssize_t resid; 444 int flags; 445 elf_file_t ef; 446 linker_file_t lf; 447 int symtabindex; 448 int symstrindex; 449 int shstrindex; 450 int nsym; 451 int pb, rl, ra; 452 int alignmask; 453 int vfslocked; 454 455 shdr = NULL; 456 lf = NULL; 457 mapsize = 0; 458 hdr = NULL; 459 460 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_SYSSPACE, filename, td); 461 flags = FREAD; 462 error = vn_open(&nd, &flags, 0, NULL); 463 if (error) 464 return error; 465 vfslocked = NDHASGIANT(&nd); 466 NDFREE(&nd, NDF_ONLY_PNBUF); 467 if (nd.ni_vp->v_type != VREG) { 468 error = ENOEXEC; 469 goto out; 470 } 471 #ifdef MAC 472 error = mac_kld_check_load(td->td_ucred, nd.ni_vp); 473 if (error) { 474 goto out; 475 } 476 #endif 477 478 /* Read the elf header from the file. */ 479 hdr = malloc(sizeof(*hdr), M_LINKER, M_WAITOK); 480 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)hdr, sizeof(*hdr), 0, 481 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 482 &resid, td); 483 if (error) 484 goto out; 485 if (resid != 0){ 486 error = ENOEXEC; 487 goto out; 488 } 489 490 if (!IS_ELF(*hdr)) { 491 error = ENOEXEC; 492 goto out; 493 } 494 495 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS 496 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) { 497 link_elf_error(filename, "Unsupported file layout"); 498 error = ENOEXEC; 499 goto out; 500 } 501 if (hdr->e_ident[EI_VERSION] != EV_CURRENT 502 || hdr->e_version != EV_CURRENT) { 503 link_elf_error(filename, "Unsupported file version"); 504 error = ENOEXEC; 505 goto out; 506 } 507 if (hdr->e_type != ET_REL) { 508 error = ENOSYS; 509 goto out; 510 } 511 if (hdr->e_machine != ELF_TARG_MACH) { 512 link_elf_error(filename, "Unsupported machine"); 513 error = ENOEXEC; 514 goto out; 515 } 516 517 lf = linker_make_file(filename, &link_elf_class); 518 if (!lf) { 519 error = ENOMEM; 520 goto out; 521 } 522 ef = (elf_file_t) lf; 523 ef->nprogtab = 0; 524 ef->e_shdr = 0; 525 ef->nreltab = 0; 526 ef->nrelatab = 0; 527 528 /* Allocate and read in the section header */ 529 nbytes = hdr->e_shnum * hdr->e_shentsize; 530 if (nbytes == 0 || hdr->e_shoff == 0 || 531 hdr->e_shentsize != sizeof(Elf_Shdr)) { 532 error = ENOEXEC; 533 goto out; 534 } 535 shdr = malloc(nbytes, M_LINKER, M_WAITOK); 536 ef->e_shdr = shdr; 537 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shdr, nbytes, hdr->e_shoff, 538 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td); 539 if (error) 540 goto out; 541 if (resid) { 542 error = ENOEXEC; 543 goto out; 544 } 545 546 /* Scan the section header for information and table sizing. */ 547 nsym = 0; 548 symtabindex = -1; 549 symstrindex = -1; 550 for (i = 0; i < hdr->e_shnum; i++) { 551 if (shdr[i].sh_size == 0) 552 continue; 553 switch (shdr[i].sh_type) { 554 case SHT_PROGBITS: 555 case SHT_NOBITS: 556 ef->nprogtab++; 557 break; 558 case SHT_SYMTAB: 559 nsym++; 560 symtabindex = i; 561 symstrindex = shdr[i].sh_link; 562 break; 563 case SHT_REL: 564 ef->nreltab++; 565 break; 566 case SHT_RELA: 567 ef->nrelatab++; 568 break; 569 case SHT_STRTAB: 570 break; 571 } 572 } 573 if (ef->nprogtab == 0) { 574 link_elf_error(filename, "file has no contents"); 575 error = ENOEXEC; 576 goto out; 577 } 578 if (nsym != 1) { 579 /* Only allow one symbol table for now */ 580 link_elf_error(filename, "file has no valid symbol table"); 581 error = ENOEXEC; 582 goto out; 583 } 584 if (symstrindex < 0 || symstrindex > hdr->e_shnum || 585 shdr[symstrindex].sh_type != SHT_STRTAB) { 586 link_elf_error(filename, "file has invalid symbol strings"); 587 error = ENOEXEC; 588 goto out; 589 } 590 591 /* Allocate space for tracking the load chunks */ 592 if (ef->nprogtab != 0) 593 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab), 594 M_LINKER, M_WAITOK | M_ZERO); 595 if (ef->nreltab != 0) 596 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab), 597 M_LINKER, M_WAITOK | M_ZERO); 598 if (ef->nrelatab != 0) 599 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab), 600 M_LINKER, M_WAITOK | M_ZERO); 601 602 if (symtabindex == -1) 603 panic("lost symbol table index"); 604 /* Allocate space for and load the symbol table */ 605 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym); 606 ef->ddbsymtab = malloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK); 607 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ef->ddbsymtab, 608 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset, 609 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 610 &resid, td); 611 if (error) 612 goto out; 613 if (resid != 0){ 614 error = EINVAL; 615 goto out; 616 } 617 618 if (symstrindex == -1) 619 panic("lost symbol string index"); 620 /* Allocate space for and load the symbol strings */ 621 ef->ddbstrcnt = shdr[symstrindex].sh_size; 622 ef->ddbstrtab = malloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK); 623 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->ddbstrtab, 624 shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset, 625 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 626 &resid, td); 627 if (error) 628 goto out; 629 if (resid != 0){ 630 error = EINVAL; 631 goto out; 632 } 633 634 /* Do we have a string table for the section names? */ 635 shstrindex = -1; 636 if (hdr->e_shstrndx != 0 && 637 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) { 638 shstrindex = hdr->e_shstrndx; 639 ef->shstrcnt = shdr[shstrindex].sh_size; 640 ef->shstrtab = malloc(shdr[shstrindex].sh_size, M_LINKER, 641 M_WAITOK); 642 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->shstrtab, 643 shdr[shstrindex].sh_size, shdr[shstrindex].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 } 653 654 /* Size up code/data(progbits) and bss(nobits). */ 655 alignmask = 0; 656 for (i = 0; i < hdr->e_shnum; i++) { 657 if (shdr[i].sh_size == 0) 658 continue; 659 switch (shdr[i].sh_type) { 660 case SHT_PROGBITS: 661 case SHT_NOBITS: 662 alignmask = shdr[i].sh_addralign - 1; 663 mapsize += alignmask; 664 mapsize &= ~alignmask; 665 mapsize += shdr[i].sh_size; 666 break; 667 } 668 } 669 670 /* 671 * We know how much space we need for the text/data/bss/etc. 672 * This stuff needs to be in a single chunk so that profiling etc 673 * can get the bounds and gdb can associate offsets with modules 674 */ 675 ef->object = vm_object_allocate(OBJT_DEFAULT, 676 round_page(mapsize) >> PAGE_SHIFT); 677 if (ef->object == NULL) { 678 error = ENOMEM; 679 goto out; 680 } 681 ef->address = (caddr_t) vm_map_min(kernel_map); 682 683 /* 684 * In order to satisfy amd64's architectural requirements on the 685 * location of code and data in the kernel's address space, request a 686 * mapping that is above the kernel. 687 */ 688 #ifdef __amd64__ 689 mapbase = KERNBASE; 690 #else 691 mapbase = VM_MIN_KERNEL_ADDRESS; 692 #endif 693 error = vm_map_find(kernel_map, ef->object, 0, &mapbase, 694 round_page(mapsize), TRUE, VM_PROT_ALL, VM_PROT_ALL, FALSE); 695 if (error) { 696 vm_object_deallocate(ef->object); 697 ef->object = 0; 698 goto out; 699 } 700 701 /* Wire the pages */ 702 error = vm_map_wire(kernel_map, mapbase, 703 mapbase + round_page(mapsize), 704 VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES); 705 if (error != KERN_SUCCESS) { 706 error = ENOMEM; 707 goto out; 708 } 709 710 /* Inform the kld system about the situation */ 711 lf->address = ef->address = (caddr_t)mapbase; 712 lf->size = mapsize; 713 714 /* 715 * Now load code/data(progbits), zero bss(nobits), allocate space for 716 * and load relocs 717 */ 718 pb = 0; 719 rl = 0; 720 ra = 0; 721 alignmask = 0; 722 for (i = 0; i < hdr->e_shnum; i++) { 723 if (shdr[i].sh_size == 0) 724 continue; 725 switch (shdr[i].sh_type) { 726 case SHT_PROGBITS: 727 case SHT_NOBITS: 728 alignmask = shdr[i].sh_addralign - 1; 729 mapbase += alignmask; 730 mapbase &= ~alignmask; 731 if (ef->shstrtab && shdr[i].sh_name != 0) 732 ef->progtab[pb].name = 733 ef->shstrtab + shdr[i].sh_name; 734 else if (shdr[i].sh_type == SHT_PROGBITS) 735 ef->progtab[pb].name = "<<PROGBITS>>"; 736 else 737 ef->progtab[pb].name = "<<NOBITS>>"; 738 if (ef->progtab[pb].name != NULL && 739 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) 740 ef->progtab[pb].addr = 741 dpcpu_alloc(shdr[i].sh_size); 742 #ifdef VIMAGE 743 else if (ef->progtab[pb].name != NULL && 744 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) 745 ef->progtab[pb].addr = 746 vnet_data_alloc(shdr[i].sh_size); 747 #endif 748 else 749 ef->progtab[pb].addr = 750 (void *)(uintptr_t)mapbase; 751 if (ef->progtab[pb].addr == NULL) { 752 error = ENOSPC; 753 goto out; 754 } 755 ef->progtab[pb].size = shdr[i].sh_size; 756 ef->progtab[pb].sec = i; 757 if (shdr[i].sh_type == SHT_PROGBITS) { 758 error = vn_rdwr(UIO_READ, nd.ni_vp, 759 ef->progtab[pb].addr, 760 shdr[i].sh_size, shdr[i].sh_offset, 761 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 762 NOCRED, &resid, td); 763 if (error) 764 goto out; 765 if (resid != 0){ 766 error = EINVAL; 767 goto out; 768 } 769 /* Initialize the per-cpu or vnet area. */ 770 if (ef->progtab[pb].addr != (void *)mapbase && 771 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) 772 dpcpu_copy(ef->progtab[pb].addr, 773 shdr[i].sh_size); 774 #ifdef VIMAGE 775 else if (ef->progtab[pb].addr != 776 (void *)mapbase && 777 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) 778 vnet_data_copy(ef->progtab[pb].addr, 779 shdr[i].sh_size); 780 #endif 781 } else 782 bzero(ef->progtab[pb].addr, shdr[i].sh_size); 783 784 /* Update all symbol values with the offset. */ 785 for (j = 0; j < ef->ddbsymcnt; j++) { 786 es = &ef->ddbsymtab[j]; 787 if (es->st_shndx != i) 788 continue; 789 es->st_value += (Elf_Addr)ef->progtab[pb].addr; 790 } 791 mapbase += shdr[i].sh_size; 792 pb++; 793 break; 794 case SHT_REL: 795 ef->reltab[rl].rel = malloc(shdr[i].sh_size, M_LINKER, 796 M_WAITOK); 797 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel); 798 ef->reltab[rl].sec = shdr[i].sh_info; 799 error = vn_rdwr(UIO_READ, nd.ni_vp, 800 (void *)ef->reltab[rl].rel, 801 shdr[i].sh_size, shdr[i].sh_offset, 802 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 803 &resid, td); 804 if (error) 805 goto out; 806 if (resid != 0){ 807 error = EINVAL; 808 goto out; 809 } 810 rl++; 811 break; 812 case SHT_RELA: 813 ef->relatab[ra].rela = malloc(shdr[i].sh_size, M_LINKER, 814 M_WAITOK); 815 ef->relatab[ra].nrela = 816 shdr[i].sh_size / sizeof(Elf_Rela); 817 ef->relatab[ra].sec = shdr[i].sh_info; 818 error = vn_rdwr(UIO_READ, nd.ni_vp, 819 (void *)ef->relatab[ra].rela, 820 shdr[i].sh_size, shdr[i].sh_offset, 821 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 822 &resid, td); 823 if (error) 824 goto out; 825 if (resid != 0){ 826 error = EINVAL; 827 goto out; 828 } 829 ra++; 830 break; 831 } 832 } 833 if (pb != ef->nprogtab) 834 panic("lost progbits"); 835 if (rl != ef->nreltab) 836 panic("lost reltab"); 837 if (ra != ef->nrelatab) 838 panic("lost relatab"); 839 if (mapbase != (vm_offset_t)ef->address + mapsize) 840 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n", 841 (u_long)mapbase, ef->address, (u_long)mapsize, 842 (u_long)(vm_offset_t)ef->address + mapsize); 843 844 /* Local intra-module relocations */ 845 link_elf_reloc_local(lf); 846 847 /* Pull in dependencies */ 848 VOP_UNLOCK(nd.ni_vp, 0); 849 error = linker_load_dependencies(lf); 850 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 851 if (error) 852 goto out; 853 854 /* External relocations */ 855 error = relocate_file(ef); 856 if (error) 857 goto out; 858 859 /* Notify MD code that a module is being loaded. */ 860 error = elf_cpu_load_file(lf); 861 if (error) 862 goto out; 863 864 *result = lf; 865 866 out: 867 VOP_UNLOCK(nd.ni_vp, 0); 868 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 869 VFS_UNLOCK_GIANT(vfslocked); 870 if (error && lf) 871 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 872 if (hdr) 873 free(hdr, M_LINKER); 874 875 return error; 876 } 877 878 static void 879 link_elf_unload_file(linker_file_t file) 880 { 881 elf_file_t ef = (elf_file_t) file; 882 int i; 883 884 /* Notify MD code that a module is being unloaded. */ 885 elf_cpu_unload_file(file); 886 887 if (ef->progtab) { 888 for (i = 0; i < ef->nprogtab; i++) { 889 if (ef->progtab[i].size == 0) 890 continue; 891 if (ef->progtab[i].name == NULL) 892 continue; 893 if (!strcmp(ef->progtab[i].name, DPCPU_SETNAME)) 894 dpcpu_free(ef->progtab[i].addr, 895 ef->progtab[i].size); 896 #ifdef VIMAGE 897 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME)) 898 vnet_data_free(ef->progtab[i].addr, 899 ef->progtab[i].size); 900 #endif 901 } 902 } 903 if (ef->preloaded) { 904 if (ef->reltab) 905 free(ef->reltab, M_LINKER); 906 if (ef->relatab) 907 free(ef->relatab, M_LINKER); 908 if (ef->progtab) 909 free(ef->progtab, M_LINKER); 910 if (ef->ctftab) 911 free(ef->ctftab, M_LINKER); 912 if (ef->ctfoff) 913 free(ef->ctfoff, M_LINKER); 914 if (ef->typoff) 915 free(ef->typoff, M_LINKER); 916 if (file->filename != NULL) 917 preload_delete_name(file->filename); 918 /* XXX reclaim module memory? */ 919 return; 920 } 921 922 for (i = 0; i < ef->nreltab; i++) 923 if (ef->reltab[i].rel) 924 free(ef->reltab[i].rel, M_LINKER); 925 for (i = 0; i < ef->nrelatab; i++) 926 if (ef->relatab[i].rela) 927 free(ef->relatab[i].rela, M_LINKER); 928 if (ef->reltab) 929 free(ef->reltab, M_LINKER); 930 if (ef->relatab) 931 free(ef->relatab, M_LINKER); 932 if (ef->progtab) 933 free(ef->progtab, M_LINKER); 934 935 if (ef->object) { 936 vm_map_remove(kernel_map, (vm_offset_t) ef->address, 937 (vm_offset_t) ef->address + 938 (ef->object->size << PAGE_SHIFT)); 939 } 940 if (ef->e_shdr) 941 free(ef->e_shdr, M_LINKER); 942 if (ef->ddbsymtab) 943 free(ef->ddbsymtab, M_LINKER); 944 if (ef->ddbstrtab) 945 free(ef->ddbstrtab, M_LINKER); 946 if (ef->shstrtab) 947 free(ef->shstrtab, M_LINKER); 948 if (ef->ctftab) 949 free(ef->ctftab, M_LINKER); 950 if (ef->ctfoff) 951 free(ef->ctfoff, M_LINKER); 952 if (ef->typoff) 953 free(ef->typoff, M_LINKER); 954 } 955 956 static const char * 957 symbol_name(elf_file_t ef, Elf_Size r_info) 958 { 959 const Elf_Sym *ref; 960 961 if (ELF_R_SYM(r_info)) { 962 ref = ef->ddbsymtab + ELF_R_SYM(r_info); 963 return ef->ddbstrtab + ref->st_name; 964 } else 965 return NULL; 966 } 967 968 static Elf_Addr 969 findbase(elf_file_t ef, int sec) 970 { 971 int i; 972 Elf_Addr base = 0; 973 974 for (i = 0; i < ef->nprogtab; i++) { 975 if (sec == ef->progtab[i].sec) { 976 base = (Elf_Addr)ef->progtab[i].addr; 977 break; 978 } 979 } 980 return base; 981 } 982 983 static int 984 relocate_file(elf_file_t ef) 985 { 986 const Elf_Rel *rellim; 987 const Elf_Rel *rel; 988 const Elf_Rela *relalim; 989 const Elf_Rela *rela; 990 const char *symname; 991 const Elf_Sym *sym; 992 int i; 993 Elf_Size symidx; 994 Elf_Addr base; 995 996 997 /* Perform relocations without addend if there are any: */ 998 for (i = 0; i < ef->nreltab; i++) { 999 rel = ef->reltab[i].rel; 1000 if (rel == NULL) 1001 panic("lost a reltab!"); 1002 rellim = rel + ef->reltab[i].nrel; 1003 base = findbase(ef, ef->reltab[i].sec); 1004 if (base == 0) 1005 panic("lost base for reltab"); 1006 for ( ; rel < rellim; rel++) { 1007 symidx = ELF_R_SYM(rel->r_info); 1008 if (symidx >= ef->ddbsymcnt) 1009 continue; 1010 sym = ef->ddbsymtab + symidx; 1011 /* Local relocs are already done */ 1012 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) 1013 continue; 1014 if (elf_reloc(&ef->lf, base, rel, ELF_RELOC_REL, 1015 elf_obj_lookup)) { 1016 symname = symbol_name(ef, rel->r_info); 1017 printf("link_elf_obj: symbol %s undefined\n", 1018 symname); 1019 return ENOENT; 1020 } 1021 } 1022 } 1023 1024 /* Perform relocations with addend if there are any: */ 1025 for (i = 0; i < ef->nrelatab; i++) { 1026 rela = ef->relatab[i].rela; 1027 if (rela == NULL) 1028 panic("lost a relatab!"); 1029 relalim = rela + ef->relatab[i].nrela; 1030 base = findbase(ef, ef->relatab[i].sec); 1031 if (base == 0) 1032 panic("lost base for relatab"); 1033 for ( ; rela < relalim; rela++) { 1034 symidx = ELF_R_SYM(rela->r_info); 1035 if (symidx >= ef->ddbsymcnt) 1036 continue; 1037 sym = ef->ddbsymtab + symidx; 1038 /* Local relocs are already done */ 1039 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) 1040 continue; 1041 if (elf_reloc(&ef->lf, base, rela, ELF_RELOC_RELA, 1042 elf_obj_lookup)) { 1043 symname = symbol_name(ef, rela->r_info); 1044 printf("link_elf_obj: symbol %s undefined\n", 1045 symname); 1046 return ENOENT; 1047 } 1048 } 1049 } 1050 1051 return 0; 1052 } 1053 1054 static int 1055 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym) 1056 { 1057 elf_file_t ef = (elf_file_t) lf; 1058 const Elf_Sym *symp; 1059 const char *strp; 1060 int i; 1061 1062 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1063 strp = ef->ddbstrtab + symp->st_name; 1064 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) { 1065 *sym = (c_linker_sym_t) symp; 1066 return 0; 1067 } 1068 } 1069 return ENOENT; 1070 } 1071 1072 static int 1073 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym, 1074 linker_symval_t *symval) 1075 { 1076 elf_file_t ef = (elf_file_t) lf; 1077 const Elf_Sym *es = (const Elf_Sym*) sym; 1078 1079 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) { 1080 symval->name = ef->ddbstrtab + es->st_name; 1081 symval->value = (caddr_t)es->st_value; 1082 symval->size = es->st_size; 1083 return 0; 1084 } 1085 return ENOENT; 1086 } 1087 1088 static int 1089 link_elf_search_symbol(linker_file_t lf, caddr_t value, 1090 c_linker_sym_t *sym, long *diffp) 1091 { 1092 elf_file_t ef = (elf_file_t) lf; 1093 u_long off = (uintptr_t) (void *) value; 1094 u_long diff = off; 1095 u_long st_value; 1096 const Elf_Sym *es; 1097 const Elf_Sym *best = 0; 1098 int i; 1099 1100 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) { 1101 if (es->st_name == 0) 1102 continue; 1103 st_value = es->st_value; 1104 if (off >= st_value) { 1105 if (off - st_value < diff) { 1106 diff = off - st_value; 1107 best = es; 1108 if (diff == 0) 1109 break; 1110 } else if (off - st_value == diff) { 1111 best = es; 1112 } 1113 } 1114 } 1115 if (best == 0) 1116 *diffp = off; 1117 else 1118 *diffp = diff; 1119 *sym = (c_linker_sym_t) best; 1120 1121 return 0; 1122 } 1123 1124 /* 1125 * Look up a linker set on an ELF system. 1126 */ 1127 static int 1128 link_elf_lookup_set(linker_file_t lf, const char *name, 1129 void ***startp, void ***stopp, int *countp) 1130 { 1131 elf_file_t ef = (elf_file_t)lf; 1132 void **start, **stop; 1133 int i, count; 1134 1135 /* Relative to section number */ 1136 for (i = 0; i < ef->nprogtab; i++) { 1137 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) && 1138 strcmp(ef->progtab[i].name + 4, name) == 0) { 1139 start = (void **)ef->progtab[i].addr; 1140 stop = (void **)((char *)ef->progtab[i].addr + 1141 ef->progtab[i].size); 1142 count = stop - start; 1143 if (startp) 1144 *startp = start; 1145 if (stopp) 1146 *stopp = stop; 1147 if (countp) 1148 *countp = count; 1149 return (0); 1150 } 1151 } 1152 return (ESRCH); 1153 } 1154 1155 static int 1156 link_elf_each_function_name(linker_file_t file, 1157 int (*callback)(const char *, void *), void *opaque) 1158 { 1159 elf_file_t ef = (elf_file_t)file; 1160 const Elf_Sym *symp; 1161 int i, error; 1162 1163 /* Exhaustive search */ 1164 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1165 if (symp->st_value != 0 && 1166 ELF_ST_TYPE(symp->st_info) == STT_FUNC) { 1167 error = callback(ef->ddbstrtab + symp->st_name, opaque); 1168 if (error) 1169 return (error); 1170 } 1171 } 1172 return (0); 1173 } 1174 1175 static int 1176 link_elf_each_function_nameval(linker_file_t file, 1177 linker_function_nameval_callback_t callback, void *opaque) 1178 { 1179 linker_symval_t symval; 1180 elf_file_t ef = (elf_file_t)file; 1181 const Elf_Sym* symp; 1182 int i, error; 1183 1184 /* Exhaustive search */ 1185 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1186 if (symp->st_value != 0 && 1187 ELF_ST_TYPE(symp->st_info) == STT_FUNC) { 1188 error = link_elf_symbol_values(file, (c_linker_sym_t) symp, &symval); 1189 if (error) 1190 return (error); 1191 error = callback(file, i, &symval, opaque); 1192 if (error) 1193 return (error); 1194 } 1195 } 1196 return (0); 1197 } 1198 1199 /* 1200 * Symbol lookup function that can be used when the symbol index is known (ie 1201 * in relocations). It uses the symbol index instead of doing a fully fledged 1202 * hash table based lookup when such is valid. For example for local symbols. 1203 * This is not only more efficient, it's also more correct. It's not always 1204 * the case that the symbol can be found through the hash table. 1205 */ 1206 static Elf_Addr 1207 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps) 1208 { 1209 elf_file_t ef = (elf_file_t)lf; 1210 const Elf_Sym *sym; 1211 const char *symbol; 1212 Elf_Addr ret; 1213 1214 /* Don't even try to lookup the symbol if the index is bogus. */ 1215 if (symidx >= ef->ddbsymcnt) 1216 return (0); 1217 1218 sym = ef->ddbsymtab + symidx; 1219 1220 /* Quick answer if there is a definition included. */ 1221 if (sym->st_shndx != SHN_UNDEF) 1222 return (sym->st_value); 1223 1224 /* If we get here, then it is undefined and needs a lookup. */ 1225 switch (ELF_ST_BIND(sym->st_info)) { 1226 case STB_LOCAL: 1227 /* Local, but undefined? huh? */ 1228 return (0); 1229 1230 case STB_GLOBAL: 1231 /* Relative to Data or Function name */ 1232 symbol = ef->ddbstrtab + sym->st_name; 1233 1234 /* Force a lookup failure if the symbol name is bogus. */ 1235 if (*symbol == 0) 1236 return (0); 1237 ret = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps)); 1238 return ret; 1239 1240 case STB_WEAK: 1241 printf("link_elf_obj: Weak symbols not supported\n"); 1242 return (0); 1243 1244 default: 1245 return (0); 1246 } 1247 } 1248 1249 static void 1250 link_elf_fix_link_set(elf_file_t ef) 1251 { 1252 static const char startn[] = "__start_"; 1253 static const char stopn[] = "__stop_"; 1254 Elf_Sym *sym; 1255 const char *sym_name, *linkset_name; 1256 Elf_Addr startp, stopp; 1257 Elf_Size symidx; 1258 int start, i; 1259 1260 startp = stopp = 0; 1261 for (symidx = 1 /* zero entry is special */; 1262 symidx < ef->ddbsymcnt; symidx++) { 1263 sym = ef->ddbsymtab + symidx; 1264 if (sym->st_shndx != SHN_UNDEF) 1265 continue; 1266 1267 sym_name = ef->ddbstrtab + sym->st_name; 1268 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) { 1269 start = 1; 1270 linkset_name = sym_name + sizeof(startn) - 1; 1271 } 1272 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) { 1273 start = 0; 1274 linkset_name = sym_name + sizeof(stopn) - 1; 1275 } 1276 else 1277 continue; 1278 1279 for (i = 0; i < ef->nprogtab; i++) { 1280 if (strcmp(ef->progtab[i].name, linkset_name) == 0) { 1281 startp = (Elf_Addr)ef->progtab[i].addr; 1282 stopp = (Elf_Addr)(startp + ef->progtab[i].size); 1283 break; 1284 } 1285 } 1286 if (i == ef->nprogtab) 1287 continue; 1288 1289 sym->st_value = start ? startp : stopp; 1290 sym->st_shndx = i; 1291 } 1292 } 1293 1294 static void 1295 link_elf_reloc_local(linker_file_t lf) 1296 { 1297 elf_file_t ef = (elf_file_t)lf; 1298 const Elf_Rel *rellim; 1299 const Elf_Rel *rel; 1300 const Elf_Rela *relalim; 1301 const Elf_Rela *rela; 1302 const Elf_Sym *sym; 1303 Elf_Addr base; 1304 int i; 1305 Elf_Size symidx; 1306 1307 link_elf_fix_link_set(ef); 1308 1309 /* Perform relocations without addend if there are any: */ 1310 for (i = 0; i < ef->nreltab; i++) { 1311 rel = ef->reltab[i].rel; 1312 if (rel == NULL) 1313 panic("lost a reltab!"); 1314 rellim = rel + ef->reltab[i].nrel; 1315 base = findbase(ef, ef->reltab[i].sec); 1316 if (base == 0) 1317 panic("lost base for reltab"); 1318 for ( ; rel < rellim; rel++) { 1319 symidx = ELF_R_SYM(rel->r_info); 1320 if (symidx >= ef->ddbsymcnt) 1321 continue; 1322 sym = ef->ddbsymtab + symidx; 1323 /* Only do local relocs */ 1324 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL) 1325 continue; 1326 elf_reloc_local(lf, base, rel, ELF_RELOC_REL, 1327 elf_obj_lookup); 1328 } 1329 } 1330 1331 /* Perform relocations with addend if there are any: */ 1332 for (i = 0; i < ef->nrelatab; i++) { 1333 rela = ef->relatab[i].rela; 1334 if (rela == NULL) 1335 panic("lost a relatab!"); 1336 relalim = rela + ef->relatab[i].nrela; 1337 base = findbase(ef, ef->relatab[i].sec); 1338 if (base == 0) 1339 panic("lost base for relatab"); 1340 for ( ; rela < relalim; rela++) { 1341 symidx = ELF_R_SYM(rela->r_info); 1342 if (symidx >= ef->ddbsymcnt) 1343 continue; 1344 sym = ef->ddbsymtab + symidx; 1345 /* Only do local relocs */ 1346 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL) 1347 continue; 1348 elf_reloc_local(lf, base, rela, ELF_RELOC_RELA, 1349 elf_obj_lookup); 1350 } 1351 } 1352 } 1353 1354 static long 1355 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab) 1356 { 1357 elf_file_t ef = (elf_file_t)lf; 1358 1359 *symtab = ef->ddbsymtab; 1360 1361 if (*symtab == NULL) 1362 return (0); 1363 1364 return (ef->ddbsymcnt); 1365 } 1366 1367 static long 1368 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab) 1369 { 1370 elf_file_t ef = (elf_file_t)lf; 1371 1372 *strtab = ef->ddbstrtab; 1373 1374 if (*strtab == NULL) 1375 return (0); 1376 1377 return (ef->ddbstrcnt); 1378 } 1379