Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/link_elf_obj.c
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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: releng/8.2/sys/kern/link_elf_obj.c 215938 2010-11-27 12:26:40Z jchandra $"); 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 if (shdr[i].sh_size == 0) 559 continue; 560 switch (shdr[i].sh_type) { 561 case SHT_PROGBITS: 562 case SHT_NOBITS: 563 ef->nprogtab++; 564 break; 565 case SHT_SYMTAB: 566 nsym++; 567 symtabindex = i; 568 symstrindex = shdr[i].sh_link; 569 break; 570 case SHT_REL: 571 ef->nreltab++; 572 break; 573 case SHT_RELA: 574 ef->nrelatab++; 575 break; 576 case SHT_STRTAB: 577 break; 578 } 579 } 580 if (ef->nprogtab == 0) { 581 link_elf_error(filename, "file has no contents"); 582 error = ENOEXEC; 583 goto out; 584 } 585 if (nsym != 1) { 586 /* Only allow one symbol table for now */ 587 link_elf_error(filename, "file has no valid symbol table"); 588 error = ENOEXEC; 589 goto out; 590 } 591 if (symstrindex < 0 || symstrindex > hdr->e_shnum || 592 shdr[symstrindex].sh_type != SHT_STRTAB) { 593 link_elf_error(filename, "file has invalid symbol strings"); 594 error = ENOEXEC; 595 goto out; 596 } 597 598 /* Allocate space for tracking the load chunks */ 599 if (ef->nprogtab != 0) 600 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab), 601 M_LINKER, M_WAITOK | M_ZERO); 602 if (ef->nreltab != 0) 603 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab), 604 M_LINKER, M_WAITOK | M_ZERO); 605 if (ef->nrelatab != 0) 606 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab), 607 M_LINKER, M_WAITOK | M_ZERO); 608 if ((ef->nprogtab != 0 && ef->progtab == NULL) || 609 (ef->nreltab != 0 && ef->reltab == NULL) || 610 (ef->nrelatab != 0 && ef->relatab == NULL)) { 611 error = ENOMEM; 612 goto out; 613 } 614 615 if (symtabindex == -1) 616 panic("lost symbol table index"); 617 /* Allocate space for and load the symbol table */ 618 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym); 619 ef->ddbsymtab = malloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK); 620 if (ef->ddbsymtab == NULL) { 621 error = ENOMEM; 622 goto out; 623 } 624 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ef->ddbsymtab, 625 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset, 626 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 627 &resid, td); 628 if (error) 629 goto out; 630 if (resid != 0){ 631 error = EINVAL; 632 goto out; 633 } 634 635 if (symstrindex == -1) 636 panic("lost symbol string index"); 637 /* Allocate space for and load the symbol strings */ 638 ef->ddbstrcnt = shdr[symstrindex].sh_size; 639 ef->ddbstrtab = malloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK); 640 if (ef->ddbstrtab == NULL) { 641 error = ENOMEM; 642 goto out; 643 } 644 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->ddbstrtab, 645 shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset, 646 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 647 &resid, td); 648 if (error) 649 goto out; 650 if (resid != 0){ 651 error = EINVAL; 652 goto out; 653 } 654 655 /* Do we have a string table for the section names? */ 656 shstrindex = -1; 657 if (hdr->e_shstrndx != 0 && 658 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) { 659 shstrindex = hdr->e_shstrndx; 660 ef->shstrcnt = shdr[shstrindex].sh_size; 661 ef->shstrtab = malloc(shdr[shstrindex].sh_size, M_LINKER, 662 M_WAITOK); 663 if (ef->shstrtab == NULL) { 664 error = ENOMEM; 665 goto out; 666 } 667 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->shstrtab, 668 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset, 669 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 670 &resid, td); 671 if (error) 672 goto out; 673 if (resid != 0){ 674 error = EINVAL; 675 goto out; 676 } 677 } 678 679 /* Size up code/data(progbits) and bss(nobits). */ 680 alignmask = 0; 681 for (i = 0; i < hdr->e_shnum; i++) { 682 if (shdr[i].sh_size == 0) 683 continue; 684 switch (shdr[i].sh_type) { 685 case SHT_PROGBITS: 686 case SHT_NOBITS: 687 alignmask = shdr[i].sh_addralign - 1; 688 mapsize += alignmask; 689 mapsize &= ~alignmask; 690 mapsize += shdr[i].sh_size; 691 break; 692 } 693 } 694 695 /* 696 * We know how much space we need for the text/data/bss/etc. 697 * This stuff needs to be in a single chunk so that profiling etc 698 * can get the bounds and gdb can associate offsets with modules 699 */ 700 ef->object = vm_object_allocate(OBJT_DEFAULT, 701 round_page(mapsize) >> PAGE_SHIFT); 702 if (ef->object == NULL) { 703 error = ENOMEM; 704 goto out; 705 } 706 ef->address = (caddr_t) vm_map_min(kernel_map); 707 708 /* 709 * In order to satisfy amd64's architectural requirements on the 710 * location of code and data in the kernel's address space, request a 711 * mapping that is above the kernel. 712 */ 713 mapbase = KERNBASE; 714 error = vm_map_find(kernel_map, ef->object, 0, &mapbase, 715 round_page(mapsize), TRUE, VM_PROT_ALL, VM_PROT_ALL, FALSE); 716 if (error) { 717 vm_object_deallocate(ef->object); 718 ef->object = 0; 719 goto out; 720 } 721 722 /* Wire the pages */ 723 error = vm_map_wire(kernel_map, mapbase, 724 mapbase + round_page(mapsize), 725 VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES); 726 if (error != KERN_SUCCESS) { 727 error = ENOMEM; 728 goto out; 729 } 730 731 /* Inform the kld system about the situation */ 732 lf->address = ef->address = (caddr_t)mapbase; 733 lf->size = mapsize; 734 735 /* 736 * Now load code/data(progbits), zero bss(nobits), allocate space for 737 * and load relocs 738 */ 739 pb = 0; 740 rl = 0; 741 ra = 0; 742 alignmask = 0; 743 for (i = 0; i < hdr->e_shnum; i++) { 744 if (shdr[i].sh_size == 0) 745 continue; 746 switch (shdr[i].sh_type) { 747 case SHT_PROGBITS: 748 case SHT_NOBITS: 749 alignmask = shdr[i].sh_addralign - 1; 750 mapbase += alignmask; 751 mapbase &= ~alignmask; 752 if (ef->shstrtab && shdr[i].sh_name != 0) 753 ef->progtab[pb].name = 754 ef->shstrtab + shdr[i].sh_name; 755 else if (shdr[i].sh_type == SHT_PROGBITS) 756 ef->progtab[pb].name = "<<PROGBITS>>"; 757 else 758 ef->progtab[pb].name = "<<NOBITS>>"; 759 if (ef->progtab[pb].name != NULL && 760 !strcmp(ef->progtab[pb].name, "set_pcpu")) 761 ef->progtab[pb].addr = 762 dpcpu_alloc(shdr[i].sh_size); 763 #ifdef VIMAGE 764 else if (ef->progtab[pb].name != NULL && 765 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) 766 ef->progtab[pb].addr = 767 vnet_data_alloc(shdr[i].sh_size); 768 #endif 769 else 770 ef->progtab[pb].addr = 771 (void *)(uintptr_t)mapbase; 772 if (ef->progtab[pb].addr == NULL) { 773 error = ENOSPC; 774 goto out; 775 } 776 ef->progtab[pb].size = shdr[i].sh_size; 777 ef->progtab[pb].sec = i; 778 if (shdr[i].sh_type == SHT_PROGBITS) { 779 error = vn_rdwr(UIO_READ, nd.ni_vp, 780 ef->progtab[pb].addr, 781 shdr[i].sh_size, shdr[i].sh_offset, 782 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 783 NOCRED, &resid, td); 784 if (error) 785 goto out; 786 if (resid != 0){ 787 error = EINVAL; 788 goto out; 789 } 790 /* Initialize the per-cpu or vnet area. */ 791 if (ef->progtab[pb].addr != (void *)mapbase && 792 !strcmp(ef->progtab[pb].name, "set_pcpu")) 793 dpcpu_copy(ef->progtab[pb].addr, 794 shdr[i].sh_size); 795 #ifdef VIMAGE 796 else if (ef->progtab[pb].addr != 797 (void *)mapbase && 798 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) 799 vnet_data_copy(ef->progtab[pb].addr, 800 shdr[i].sh_size); 801 #endif 802 } else 803 bzero(ef->progtab[pb].addr, shdr[i].sh_size); 804 805 /* Update all symbol values with the offset. */ 806 for (j = 0; j < ef->ddbsymcnt; j++) { 807 es = &ef->ddbsymtab[j]; 808 if (es->st_shndx != i) 809 continue; 810 es->st_value += (Elf_Addr)ef->progtab[pb].addr; 811 } 812 mapbase += shdr[i].sh_size; 813 pb++; 814 break; 815 case SHT_REL: 816 ef->reltab[rl].rel = malloc(shdr[i].sh_size, M_LINKER, 817 M_WAITOK); 818 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel); 819 ef->reltab[rl].sec = shdr[i].sh_info; 820 error = vn_rdwr(UIO_READ, nd.ni_vp, 821 (void *)ef->reltab[rl].rel, 822 shdr[i].sh_size, shdr[i].sh_offset, 823 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 824 &resid, td); 825 if (error) 826 goto out; 827 if (resid != 0){ 828 error = EINVAL; 829 goto out; 830 } 831 rl++; 832 break; 833 case SHT_RELA: 834 ef->relatab[ra].rela = malloc(shdr[i].sh_size, M_LINKER, 835 M_WAITOK); 836 ef->relatab[ra].nrela = 837 shdr[i].sh_size / sizeof(Elf_Rela); 838 ef->relatab[ra].sec = shdr[i].sh_info; 839 error = vn_rdwr(UIO_READ, nd.ni_vp, 840 (void *)ef->relatab[ra].rela, 841 shdr[i].sh_size, shdr[i].sh_offset, 842 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 843 &resid, td); 844 if (error) 845 goto out; 846 if (resid != 0){ 847 error = EINVAL; 848 goto out; 849 } 850 ra++; 851 break; 852 } 853 } 854 if (pb != ef->nprogtab) 855 panic("lost progbits"); 856 if (rl != ef->nreltab) 857 panic("lost reltab"); 858 if (ra != ef->nrelatab) 859 panic("lost relatab"); 860 if (mapbase != (vm_offset_t)ef->address + mapsize) 861 panic("mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n", 862 (u_long)mapbase, ef->address, (u_long)mapsize, 863 (u_long)(vm_offset_t)ef->address + mapsize); 864 865 /* Local intra-module relocations */ 866 link_elf_reloc_local(lf); 867 868 /* Pull in dependencies */ 869 VOP_UNLOCK(nd.ni_vp, 0); 870 error = linker_load_dependencies(lf); 871 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 872 if (error) 873 goto out; 874 875 /* External relocations */ 876 error = relocate_file(ef); 877 if (error) 878 goto out; 879 880 /* Notify MD code that a module is being loaded. */ 881 error = elf_cpu_load_file(lf); 882 if (error) 883 goto out; 884 885 *result = lf; 886 887 out: 888 VOP_UNLOCK(nd.ni_vp, 0); 889 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 890 VFS_UNLOCK_GIANT(vfslocked); 891 if (error && lf) 892 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 893 if (hdr) 894 free(hdr, M_LINKER); 895 896 return error; 897 } 898 899 static void 900 link_elf_unload_file(linker_file_t file) 901 { 902 elf_file_t ef = (elf_file_t) file; 903 int i; 904 905 /* Notify MD code that a module is being unloaded. */ 906 elf_cpu_unload_file(file); 907 908 if (ef->progtab) { 909 for (i = 0; i < ef->nprogtab; i++) { 910 if (ef->progtab[i].size == 0) 911 continue; 912 if (ef->progtab[i].name == NULL) 913 continue; 914 if (!strcmp(ef->progtab[i].name, "set_pcpu")) 915 dpcpu_free(ef->progtab[i].addr, 916 ef->progtab[i].size); 917 #ifdef VIMAGE 918 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME)) 919 vnet_data_free(ef->progtab[i].addr, 920 ef->progtab[i].size); 921 #endif 922 } 923 } 924 if (ef->preloaded) { 925 if (ef->reltab) 926 free(ef->reltab, M_LINKER); 927 if (ef->relatab) 928 free(ef->relatab, M_LINKER); 929 if (ef->progtab) 930 free(ef->progtab, M_LINKER); 931 if (ef->ctftab) 932 free(ef->ctftab, M_LINKER); 933 if (ef->ctfoff) 934 free(ef->ctfoff, M_LINKER); 935 if (ef->typoff) 936 free(ef->typoff, M_LINKER); 937 if (file->filename != NULL) 938 preload_delete_name(file->filename); 939 /* XXX reclaim module memory? */ 940 return; 941 } 942 943 for (i = 0; i < ef->nreltab; i++) 944 if (ef->reltab[i].rel) 945 free(ef->reltab[i].rel, M_LINKER); 946 for (i = 0; i < ef->nrelatab; i++) 947 if (ef->relatab[i].rela) 948 free(ef->relatab[i].rela, M_LINKER); 949 if (ef->reltab) 950 free(ef->reltab, M_LINKER); 951 if (ef->relatab) 952 free(ef->relatab, M_LINKER); 953 if (ef->progtab) 954 free(ef->progtab, M_LINKER); 955 956 if (ef->object) { 957 vm_map_remove(kernel_map, (vm_offset_t) ef->address, 958 (vm_offset_t) ef->address + 959 (ef->object->size << PAGE_SHIFT)); 960 } 961 if (ef->e_shdr) 962 free(ef->e_shdr, M_LINKER); 963 if (ef->ddbsymtab) 964 free(ef->ddbsymtab, M_LINKER); 965 if (ef->ddbstrtab) 966 free(ef->ddbstrtab, M_LINKER); 967 if (ef->shstrtab) 968 free(ef->shstrtab, M_LINKER); 969 if (ef->ctftab) 970 free(ef->ctftab, M_LINKER); 971 if (ef->ctfoff) 972 free(ef->ctfoff, M_LINKER); 973 if (ef->typoff) 974 free(ef->typoff, M_LINKER); 975 } 976 977 static const char * 978 symbol_name(elf_file_t ef, Elf_Size r_info) 979 { 980 const Elf_Sym *ref; 981 982 if (ELF_R_SYM(r_info)) { 983 ref = ef->ddbsymtab + ELF_R_SYM(r_info); 984 return ef->ddbstrtab + ref->st_name; 985 } else 986 return NULL; 987 } 988 989 static Elf_Addr 990 findbase(elf_file_t ef, int sec) 991 { 992 int i; 993 Elf_Addr base = 0; 994 995 for (i = 0; i < ef->nprogtab; i++) { 996 if (sec == ef->progtab[i].sec) { 997 base = (Elf_Addr)ef->progtab[i].addr; 998 break; 999 } 1000 } 1001 return base; 1002 } 1003 1004 static int 1005 relocate_file(elf_file_t ef) 1006 { 1007 const Elf_Rel *rellim; 1008 const Elf_Rel *rel; 1009 const Elf_Rela *relalim; 1010 const Elf_Rela *rela; 1011 const char *symname; 1012 const Elf_Sym *sym; 1013 int i; 1014 Elf_Size symidx; 1015 Elf_Addr base; 1016 1017 1018 /* Perform relocations without addend if there are any: */ 1019 for (i = 0; i < ef->nreltab; i++) { 1020 rel = ef->reltab[i].rel; 1021 if (rel == NULL) 1022 panic("lost a reltab!"); 1023 rellim = rel + ef->reltab[i].nrel; 1024 base = findbase(ef, ef->reltab[i].sec); 1025 if (base == 0) 1026 panic("lost base for reltab"); 1027 for ( ; rel < rellim; rel++) { 1028 symidx = ELF_R_SYM(rel->r_info); 1029 if (symidx >= ef->ddbsymcnt) 1030 continue; 1031 sym = ef->ddbsymtab + symidx; 1032 /* Local relocs are already done */ 1033 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) 1034 continue; 1035 if (elf_reloc(&ef->lf, base, rel, ELF_RELOC_REL, 1036 elf_obj_lookup)) { 1037 symname = symbol_name(ef, rel->r_info); 1038 printf("link_elf_obj: symbol %s undefined\n", 1039 symname); 1040 return ENOENT; 1041 } 1042 } 1043 } 1044 1045 /* Perform relocations with addend if there are any: */ 1046 for (i = 0; i < ef->nrelatab; i++) { 1047 rela = ef->relatab[i].rela; 1048 if (rela == NULL) 1049 panic("lost a relatab!"); 1050 relalim = rela + ef->relatab[i].nrela; 1051 base = findbase(ef, ef->relatab[i].sec); 1052 if (base == 0) 1053 panic("lost base for relatab"); 1054 for ( ; rela < relalim; rela++) { 1055 symidx = ELF_R_SYM(rela->r_info); 1056 if (symidx >= ef->ddbsymcnt) 1057 continue; 1058 sym = ef->ddbsymtab + symidx; 1059 /* Local relocs are already done */ 1060 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) 1061 continue; 1062 if (elf_reloc(&ef->lf, base, rela, ELF_RELOC_RELA, 1063 elf_obj_lookup)) { 1064 symname = symbol_name(ef, rela->r_info); 1065 printf("link_elf_obj: symbol %s undefined\n", 1066 symname); 1067 return ENOENT; 1068 } 1069 } 1070 } 1071 1072 return 0; 1073 } 1074 1075 static int 1076 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym) 1077 { 1078 elf_file_t ef = (elf_file_t) lf; 1079 const Elf_Sym *symp; 1080 const char *strp; 1081 int i; 1082 1083 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1084 strp = ef->ddbstrtab + symp->st_name; 1085 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) { 1086 *sym = (c_linker_sym_t) symp; 1087 return 0; 1088 } 1089 } 1090 return ENOENT; 1091 } 1092 1093 static int 1094 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym, 1095 linker_symval_t *symval) 1096 { 1097 elf_file_t ef = (elf_file_t) lf; 1098 const Elf_Sym *es = (const Elf_Sym*) sym; 1099 1100 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) { 1101 symval->name = ef->ddbstrtab + es->st_name; 1102 symval->value = (caddr_t)es->st_value; 1103 symval->size = es->st_size; 1104 return 0; 1105 } 1106 return ENOENT; 1107 } 1108 1109 static int 1110 link_elf_search_symbol(linker_file_t lf, caddr_t value, 1111 c_linker_sym_t *sym, long *diffp) 1112 { 1113 elf_file_t ef = (elf_file_t) lf; 1114 u_long off = (uintptr_t) (void *) value; 1115 u_long diff = off; 1116 u_long st_value; 1117 const Elf_Sym *es; 1118 const Elf_Sym *best = 0; 1119 int i; 1120 1121 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) { 1122 if (es->st_name == 0) 1123 continue; 1124 st_value = es->st_value; 1125 if (off >= st_value) { 1126 if (off - st_value < diff) { 1127 diff = off - st_value; 1128 best = es; 1129 if (diff == 0) 1130 break; 1131 } else if (off - st_value == diff) { 1132 best = es; 1133 } 1134 } 1135 } 1136 if (best == 0) 1137 *diffp = off; 1138 else 1139 *diffp = diff; 1140 *sym = (c_linker_sym_t) best; 1141 1142 return 0; 1143 } 1144 1145 /* 1146 * Look up a linker set on an ELF system. 1147 */ 1148 static int 1149 link_elf_lookup_set(linker_file_t lf, const char *name, 1150 void ***startp, void ***stopp, int *countp) 1151 { 1152 elf_file_t ef = (elf_file_t)lf; 1153 void **start, **stop; 1154 int i, count; 1155 1156 /* Relative to section number */ 1157 for (i = 0; i < ef->nprogtab; i++) { 1158 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) && 1159 strcmp(ef->progtab[i].name + 4, name) == 0) { 1160 start = (void **)ef->progtab[i].addr; 1161 stop = (void **)((char *)ef->progtab[i].addr + 1162 ef->progtab[i].size); 1163 count = stop - start; 1164 if (startp) 1165 *startp = start; 1166 if (stopp) 1167 *stopp = stop; 1168 if (countp) 1169 *countp = count; 1170 return (0); 1171 } 1172 } 1173 return (ESRCH); 1174 } 1175 1176 static int 1177 link_elf_each_function_name(linker_file_t file, 1178 int (*callback)(const char *, void *), void *opaque) 1179 { 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 = callback(ef->ddbstrtab + symp->st_name, opaque); 1189 if (error) 1190 return (error); 1191 } 1192 } 1193 return (0); 1194 } 1195 1196 static int 1197 link_elf_each_function_nameval(linker_file_t file, 1198 linker_function_nameval_callback_t callback, void *opaque) 1199 { 1200 linker_symval_t symval; 1201 elf_file_t ef = (elf_file_t)file; 1202 const Elf_Sym* symp; 1203 int i, error; 1204 1205 /* Exhaustive search */ 1206 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1207 if (symp->st_value != 0 && 1208 ELF_ST_TYPE(symp->st_info) == STT_FUNC) { 1209 error = link_elf_symbol_values(file, (c_linker_sym_t) symp, &symval); 1210 if (error) 1211 return (error); 1212 error = callback(file, i, &symval, opaque); 1213 if (error) 1214 return (error); 1215 } 1216 } 1217 return (0); 1218 } 1219 1220 /* 1221 * Symbol lookup function that can be used when the symbol index is known (ie 1222 * in relocations). It uses the symbol index instead of doing a fully fledged 1223 * hash table based lookup when such is valid. For example for local symbols. 1224 * This is not only more efficient, it's also more correct. It's not always 1225 * the case that the symbol can be found through the hash table. 1226 */ 1227 static Elf_Addr 1228 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps) 1229 { 1230 elf_file_t ef = (elf_file_t)lf; 1231 const Elf_Sym *sym; 1232 const char *symbol; 1233 Elf_Addr ret; 1234 1235 /* Don't even try to lookup the symbol if the index is bogus. */ 1236 if (symidx >= ef->ddbsymcnt) 1237 return (0); 1238 1239 sym = ef->ddbsymtab + symidx; 1240 1241 /* Quick answer if there is a definition included. */ 1242 if (sym->st_shndx != SHN_UNDEF) 1243 return (sym->st_value); 1244 1245 /* If we get here, then it is undefined and needs a lookup. */ 1246 switch (ELF_ST_BIND(sym->st_info)) { 1247 case STB_LOCAL: 1248 /* Local, but undefined? huh? */ 1249 return (0); 1250 1251 case STB_GLOBAL: 1252 /* Relative to Data or Function name */ 1253 symbol = ef->ddbstrtab + sym->st_name; 1254 1255 /* Force a lookup failure if the symbol name is bogus. */ 1256 if (*symbol == 0) 1257 return (0); 1258 ret = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps)); 1259 return ret; 1260 1261 case STB_WEAK: 1262 printf("link_elf_obj: Weak symbols not supported\n"); 1263 return (0); 1264 1265 default: 1266 return (0); 1267 } 1268 } 1269 1270 static void 1271 link_elf_fix_link_set(elf_file_t ef) 1272 { 1273 static const char startn[] = "__start_"; 1274 static const char stopn[] = "__stop_"; 1275 Elf_Sym *sym; 1276 const char *sym_name, *linkset_name; 1277 Elf_Addr startp, stopp; 1278 Elf_Size symidx; 1279 int start, i; 1280 1281 startp = stopp = 0; 1282 for (symidx = 1 /* zero entry is special */; 1283 symidx < ef->ddbsymcnt; symidx++) { 1284 sym = ef->ddbsymtab + symidx; 1285 if (sym->st_shndx != SHN_UNDEF) 1286 continue; 1287 1288 sym_name = ef->ddbstrtab + sym->st_name; 1289 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) { 1290 start = 1; 1291 linkset_name = sym_name + sizeof(startn) - 1; 1292 } 1293 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) { 1294 start = 0; 1295 linkset_name = sym_name + sizeof(stopn) - 1; 1296 } 1297 else 1298 continue; 1299 1300 for (i = 0; i < ef->nprogtab; i++) { 1301 if (strcmp(ef->progtab[i].name, linkset_name) == 0) { 1302 startp = (Elf_Addr)ef->progtab[i].addr; 1303 stopp = (Elf_Addr)(startp + ef->progtab[i].size); 1304 break; 1305 } 1306 } 1307 if (i == ef->nprogtab) 1308 continue; 1309 1310 sym->st_value = start ? startp : stopp; 1311 sym->st_shndx = i; 1312 } 1313 } 1314 1315 static void 1316 link_elf_reloc_local(linker_file_t lf) 1317 { 1318 elf_file_t ef = (elf_file_t)lf; 1319 const Elf_Rel *rellim; 1320 const Elf_Rel *rel; 1321 const Elf_Rela *relalim; 1322 const Elf_Rela *rela; 1323 const Elf_Sym *sym; 1324 Elf_Addr base; 1325 int i; 1326 Elf_Size symidx; 1327 1328 link_elf_fix_link_set(ef); 1329 1330 /* Perform relocations without addend if there are any: */ 1331 for (i = 0; i < ef->nreltab; i++) { 1332 rel = ef->reltab[i].rel; 1333 if (rel == NULL) 1334 panic("lost a reltab!"); 1335 rellim = rel + ef->reltab[i].nrel; 1336 base = findbase(ef, ef->reltab[i].sec); 1337 if (base == 0) 1338 panic("lost base for reltab"); 1339 for ( ; rel < rellim; rel++) { 1340 symidx = ELF_R_SYM(rel->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, rel, ELF_RELOC_REL, 1348 elf_obj_lookup); 1349 } 1350 } 1351 1352 /* Perform relocations with addend if there are any: */ 1353 for (i = 0; i < ef->nrelatab; i++) { 1354 rela = ef->relatab[i].rela; 1355 if (rela == NULL) 1356 panic("lost a relatab!"); 1357 relalim = rela + ef->relatab[i].nrela; 1358 base = findbase(ef, ef->relatab[i].sec); 1359 if (base == 0) 1360 panic("lost base for relatab"); 1361 for ( ; rela < relalim; rela++) { 1362 symidx = ELF_R_SYM(rela->r_info); 1363 if (symidx >= ef->ddbsymcnt) 1364 continue; 1365 sym = ef->ddbsymtab + symidx; 1366 /* Only do local relocs */ 1367 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL) 1368 continue; 1369 elf_reloc_local(lf, base, rela, ELF_RELOC_RELA, 1370 elf_obj_lookup); 1371 } 1372 } 1373 } 1374 1375 static long 1376 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab) 1377 { 1378 elf_file_t ef = (elf_file_t)lf; 1379 1380 *symtab = ef->ddbsymtab; 1381 1382 if (*symtab == NULL) 1383 return (0); 1384 1385 return (ef->ddbsymcnt); 1386 } 1387 1388 static long 1389 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab) 1390 { 1391 elf_file_t ef = (elf_file_t)lf; 1392 1393 *strtab = ef->ddbstrtab; 1394 1395 if (*strtab == NULL) 1396 return (0); 1397 1398 return (ef->ddbstrcnt); 1399 }
Cache object: 433a84703768611394717fc5b4947680
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