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/10.0/sys/kern/link_elf_obj.c 255426 2013-09-09 18:11:59Z jhb $"); 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; 453 454 shdr = NULL; 455 lf = NULL; 456 mapsize = 0; 457 hdr = NULL; 458 459 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename, td); 460 flags = FREAD; 461 error = vn_open(&nd, &flags, 0, NULL); 462 if (error) 463 return error; 464 NDFREE(&nd, NDF_ONLY_PNBUF); 465 if (nd.ni_vp->v_type != VREG) { 466 error = ENOEXEC; 467 goto out; 468 } 469 #ifdef MAC 470 error = mac_kld_check_load(td->td_ucred, nd.ni_vp); 471 if (error) { 472 goto out; 473 } 474 #endif 475 476 /* Read the elf header from the file. */ 477 hdr = malloc(sizeof(*hdr), M_LINKER, M_WAITOK); 478 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)hdr, sizeof(*hdr), 0, 479 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 480 &resid, td); 481 if (error) 482 goto out; 483 if (resid != 0){ 484 error = ENOEXEC; 485 goto out; 486 } 487 488 if (!IS_ELF(*hdr)) { 489 error = ENOEXEC; 490 goto out; 491 } 492 493 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS 494 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) { 495 link_elf_error(filename, "Unsupported file layout"); 496 error = ENOEXEC; 497 goto out; 498 } 499 if (hdr->e_ident[EI_VERSION] != EV_CURRENT 500 || hdr->e_version != EV_CURRENT) { 501 link_elf_error(filename, "Unsupported file version"); 502 error = ENOEXEC; 503 goto out; 504 } 505 if (hdr->e_type != ET_REL) { 506 error = ENOSYS; 507 goto out; 508 } 509 if (hdr->e_machine != ELF_TARG_MACH) { 510 link_elf_error(filename, "Unsupported machine"); 511 error = ENOEXEC; 512 goto out; 513 } 514 515 lf = linker_make_file(filename, &link_elf_class); 516 if (!lf) { 517 error = ENOMEM; 518 goto out; 519 } 520 ef = (elf_file_t) lf; 521 ef->nprogtab = 0; 522 ef->e_shdr = 0; 523 ef->nreltab = 0; 524 ef->nrelatab = 0; 525 526 /* Allocate and read in the section header */ 527 nbytes = hdr->e_shnum * hdr->e_shentsize; 528 if (nbytes == 0 || hdr->e_shoff == 0 || 529 hdr->e_shentsize != sizeof(Elf_Shdr)) { 530 error = ENOEXEC; 531 goto out; 532 } 533 shdr = malloc(nbytes, M_LINKER, M_WAITOK); 534 ef->e_shdr = shdr; 535 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shdr, nbytes, hdr->e_shoff, 536 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td); 537 if (error) 538 goto out; 539 if (resid) { 540 error = ENOEXEC; 541 goto out; 542 } 543 544 /* Scan the section header for information and table sizing. */ 545 nsym = 0; 546 symtabindex = -1; 547 symstrindex = -1; 548 for (i = 0; i < hdr->e_shnum; i++) { 549 if (shdr[i].sh_size == 0) 550 continue; 551 switch (shdr[i].sh_type) { 552 case SHT_PROGBITS: 553 case SHT_NOBITS: 554 ef->nprogtab++; 555 break; 556 case SHT_SYMTAB: 557 nsym++; 558 symtabindex = i; 559 symstrindex = shdr[i].sh_link; 560 break; 561 case SHT_REL: 562 ef->nreltab++; 563 break; 564 case SHT_RELA: 565 ef->nrelatab++; 566 break; 567 case SHT_STRTAB: 568 break; 569 } 570 } 571 if (ef->nprogtab == 0) { 572 link_elf_error(filename, "file has no contents"); 573 error = ENOEXEC; 574 goto out; 575 } 576 if (nsym != 1) { 577 /* Only allow one symbol table for now */ 578 link_elf_error(filename, "file has no valid symbol table"); 579 error = ENOEXEC; 580 goto out; 581 } 582 if (symstrindex < 0 || symstrindex > hdr->e_shnum || 583 shdr[symstrindex].sh_type != SHT_STRTAB) { 584 link_elf_error(filename, "file has invalid symbol strings"); 585 error = ENOEXEC; 586 goto out; 587 } 588 589 /* Allocate space for tracking the load chunks */ 590 if (ef->nprogtab != 0) 591 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab), 592 M_LINKER, M_WAITOK | M_ZERO); 593 if (ef->nreltab != 0) 594 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab), 595 M_LINKER, M_WAITOK | M_ZERO); 596 if (ef->nrelatab != 0) 597 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab), 598 M_LINKER, M_WAITOK | M_ZERO); 599 600 if (symtabindex == -1) 601 panic("lost symbol table index"); 602 /* Allocate space for and load the symbol table */ 603 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym); 604 ef->ddbsymtab = malloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK); 605 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ef->ddbsymtab, 606 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset, 607 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 608 &resid, td); 609 if (error) 610 goto out; 611 if (resid != 0){ 612 error = EINVAL; 613 goto out; 614 } 615 616 if (symstrindex == -1) 617 panic("lost symbol string index"); 618 /* Allocate space for and load the symbol strings */ 619 ef->ddbstrcnt = shdr[symstrindex].sh_size; 620 ef->ddbstrtab = malloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK); 621 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->ddbstrtab, 622 shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset, 623 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 624 &resid, td); 625 if (error) 626 goto out; 627 if (resid != 0){ 628 error = EINVAL; 629 goto out; 630 } 631 632 /* Do we have a string table for the section names? */ 633 shstrindex = -1; 634 if (hdr->e_shstrndx != 0 && 635 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) { 636 shstrindex = hdr->e_shstrndx; 637 ef->shstrcnt = shdr[shstrindex].sh_size; 638 ef->shstrtab = malloc(shdr[shstrindex].sh_size, M_LINKER, 639 M_WAITOK); 640 error = vn_rdwr(UIO_READ, nd.ni_vp, ef->shstrtab, 641 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset, 642 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, 643 &resid, td); 644 if (error) 645 goto out; 646 if (resid != 0){ 647 error = EINVAL; 648 goto out; 649 } 650 } 651 652 /* Size up code/data(progbits) and bss(nobits). */ 653 alignmask = 0; 654 for (i = 0; i < hdr->e_shnum; i++) { 655 if (shdr[i].sh_size == 0) 656 continue; 657 switch (shdr[i].sh_type) { 658 case SHT_PROGBITS: 659 case SHT_NOBITS: 660 alignmask = shdr[i].sh_addralign - 1; 661 mapsize += alignmask; 662 mapsize &= ~alignmask; 663 mapsize += shdr[i].sh_size; 664 break; 665 } 666 } 667 668 /* 669 * We know how much space we need for the text/data/bss/etc. 670 * This stuff needs to be in a single chunk so that profiling etc 671 * can get the bounds and gdb can associate offsets with modules 672 */ 673 ef->object = vm_object_allocate(OBJT_DEFAULT, 674 round_page(mapsize) >> PAGE_SHIFT); 675 if (ef->object == NULL) { 676 error = ENOMEM; 677 goto out; 678 } 679 ef->address = (caddr_t) vm_map_min(kernel_map); 680 681 /* 682 * In order to satisfy amd64's architectural requirements on the 683 * location of code and data in the kernel's address space, request a 684 * mapping that is above the kernel. 685 */ 686 #ifdef __amd64__ 687 mapbase = KERNBASE; 688 #else 689 mapbase = VM_MIN_KERNEL_ADDRESS; 690 #endif 691 error = vm_map_find(kernel_map, ef->object, 0, &mapbase, 692 round_page(mapsize), 0, VMFS_OPTIMAL_SPACE, VM_PROT_ALL, 693 VM_PROT_ALL, 0); 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 if (error && lf) 869 linker_file_unload(lf, LINKER_UNLOAD_FORCE); 870 if (hdr) 871 free(hdr, M_LINKER); 872 873 return error; 874 } 875 876 static void 877 link_elf_unload_file(linker_file_t file) 878 { 879 elf_file_t ef = (elf_file_t) file; 880 int i; 881 882 /* Notify MD code that a module is being unloaded. */ 883 elf_cpu_unload_file(file); 884 885 if (ef->progtab) { 886 for (i = 0; i < ef->nprogtab; i++) { 887 if (ef->progtab[i].size == 0) 888 continue; 889 if (ef->progtab[i].name == NULL) 890 continue; 891 if (!strcmp(ef->progtab[i].name, DPCPU_SETNAME)) 892 dpcpu_free(ef->progtab[i].addr, 893 ef->progtab[i].size); 894 #ifdef VIMAGE 895 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME)) 896 vnet_data_free(ef->progtab[i].addr, 897 ef->progtab[i].size); 898 #endif 899 } 900 } 901 if (ef->preloaded) { 902 if (ef->reltab) 903 free(ef->reltab, M_LINKER); 904 if (ef->relatab) 905 free(ef->relatab, M_LINKER); 906 if (ef->progtab) 907 free(ef->progtab, M_LINKER); 908 if (ef->ctftab) 909 free(ef->ctftab, M_LINKER); 910 if (ef->ctfoff) 911 free(ef->ctfoff, M_LINKER); 912 if (ef->typoff) 913 free(ef->typoff, M_LINKER); 914 if (file->filename != NULL) 915 preload_delete_name(file->filename); 916 /* XXX reclaim module memory? */ 917 return; 918 } 919 920 for (i = 0; i < ef->nreltab; i++) 921 if (ef->reltab[i].rel) 922 free(ef->reltab[i].rel, M_LINKER); 923 for (i = 0; i < ef->nrelatab; i++) 924 if (ef->relatab[i].rela) 925 free(ef->relatab[i].rela, M_LINKER); 926 if (ef->reltab) 927 free(ef->reltab, M_LINKER); 928 if (ef->relatab) 929 free(ef->relatab, M_LINKER); 930 if (ef->progtab) 931 free(ef->progtab, M_LINKER); 932 933 if (ef->object) { 934 vm_map_remove(kernel_map, (vm_offset_t) ef->address, 935 (vm_offset_t) ef->address + 936 (ef->object->size << PAGE_SHIFT)); 937 } 938 if (ef->e_shdr) 939 free(ef->e_shdr, M_LINKER); 940 if (ef->ddbsymtab) 941 free(ef->ddbsymtab, M_LINKER); 942 if (ef->ddbstrtab) 943 free(ef->ddbstrtab, M_LINKER); 944 if (ef->shstrtab) 945 free(ef->shstrtab, M_LINKER); 946 if (ef->ctftab) 947 free(ef->ctftab, M_LINKER); 948 if (ef->ctfoff) 949 free(ef->ctfoff, M_LINKER); 950 if (ef->typoff) 951 free(ef->typoff, M_LINKER); 952 } 953 954 static const char * 955 symbol_name(elf_file_t ef, Elf_Size r_info) 956 { 957 const Elf_Sym *ref; 958 959 if (ELF_R_SYM(r_info)) { 960 ref = ef->ddbsymtab + ELF_R_SYM(r_info); 961 return ef->ddbstrtab + ref->st_name; 962 } else 963 return NULL; 964 } 965 966 static Elf_Addr 967 findbase(elf_file_t ef, int sec) 968 { 969 int i; 970 Elf_Addr base = 0; 971 972 for (i = 0; i < ef->nprogtab; i++) { 973 if (sec == ef->progtab[i].sec) { 974 base = (Elf_Addr)ef->progtab[i].addr; 975 break; 976 } 977 } 978 return base; 979 } 980 981 static int 982 relocate_file(elf_file_t ef) 983 { 984 const Elf_Rel *rellim; 985 const Elf_Rel *rel; 986 const Elf_Rela *relalim; 987 const Elf_Rela *rela; 988 const char *symname; 989 const Elf_Sym *sym; 990 int i; 991 Elf_Size symidx; 992 Elf_Addr base; 993 994 995 /* Perform relocations without addend if there are any: */ 996 for (i = 0; i < ef->nreltab; i++) { 997 rel = ef->reltab[i].rel; 998 if (rel == NULL) 999 panic("lost a reltab!"); 1000 rellim = rel + ef->reltab[i].nrel; 1001 base = findbase(ef, ef->reltab[i].sec); 1002 if (base == 0) 1003 panic("lost base for reltab"); 1004 for ( ; rel < rellim; rel++) { 1005 symidx = ELF_R_SYM(rel->r_info); 1006 if (symidx >= ef->ddbsymcnt) 1007 continue; 1008 sym = ef->ddbsymtab + symidx; 1009 /* Local relocs are already done */ 1010 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) 1011 continue; 1012 if (elf_reloc(&ef->lf, base, rel, ELF_RELOC_REL, 1013 elf_obj_lookup)) { 1014 symname = symbol_name(ef, rel->r_info); 1015 printf("link_elf_obj: symbol %s undefined\n", 1016 symname); 1017 return ENOENT; 1018 } 1019 } 1020 } 1021 1022 /* Perform relocations with addend if there are any: */ 1023 for (i = 0; i < ef->nrelatab; i++) { 1024 rela = ef->relatab[i].rela; 1025 if (rela == NULL) 1026 panic("lost a relatab!"); 1027 relalim = rela + ef->relatab[i].nrela; 1028 base = findbase(ef, ef->relatab[i].sec); 1029 if (base == 0) 1030 panic("lost base for relatab"); 1031 for ( ; rela < relalim; rela++) { 1032 symidx = ELF_R_SYM(rela->r_info); 1033 if (symidx >= ef->ddbsymcnt) 1034 continue; 1035 sym = ef->ddbsymtab + symidx; 1036 /* Local relocs are already done */ 1037 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) 1038 continue; 1039 if (elf_reloc(&ef->lf, base, rela, ELF_RELOC_RELA, 1040 elf_obj_lookup)) { 1041 symname = symbol_name(ef, rela->r_info); 1042 printf("link_elf_obj: symbol %s undefined\n", 1043 symname); 1044 return ENOENT; 1045 } 1046 } 1047 } 1048 1049 return 0; 1050 } 1051 1052 static int 1053 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym) 1054 { 1055 elf_file_t ef = (elf_file_t) lf; 1056 const Elf_Sym *symp; 1057 const char *strp; 1058 int i; 1059 1060 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1061 strp = ef->ddbstrtab + symp->st_name; 1062 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) { 1063 *sym = (c_linker_sym_t) symp; 1064 return 0; 1065 } 1066 } 1067 return ENOENT; 1068 } 1069 1070 static int 1071 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym, 1072 linker_symval_t *symval) 1073 { 1074 elf_file_t ef = (elf_file_t) lf; 1075 const Elf_Sym *es = (const Elf_Sym*) sym; 1076 1077 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) { 1078 symval->name = ef->ddbstrtab + es->st_name; 1079 symval->value = (caddr_t)es->st_value; 1080 symval->size = es->st_size; 1081 return 0; 1082 } 1083 return ENOENT; 1084 } 1085 1086 static int 1087 link_elf_search_symbol(linker_file_t lf, caddr_t value, 1088 c_linker_sym_t *sym, long *diffp) 1089 { 1090 elf_file_t ef = (elf_file_t) lf; 1091 u_long off = (uintptr_t) (void *) value; 1092 u_long diff = off; 1093 u_long st_value; 1094 const Elf_Sym *es; 1095 const Elf_Sym *best = 0; 1096 int i; 1097 1098 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) { 1099 if (es->st_name == 0) 1100 continue; 1101 st_value = es->st_value; 1102 if (off >= st_value) { 1103 if (off - st_value < diff) { 1104 diff = off - st_value; 1105 best = es; 1106 if (diff == 0) 1107 break; 1108 } else if (off - st_value == diff) { 1109 best = es; 1110 } 1111 } 1112 } 1113 if (best == 0) 1114 *diffp = off; 1115 else 1116 *diffp = diff; 1117 *sym = (c_linker_sym_t) best; 1118 1119 return 0; 1120 } 1121 1122 /* 1123 * Look up a linker set on an ELF system. 1124 */ 1125 static int 1126 link_elf_lookup_set(linker_file_t lf, const char *name, 1127 void ***startp, void ***stopp, int *countp) 1128 { 1129 elf_file_t ef = (elf_file_t)lf; 1130 void **start, **stop; 1131 int i, count; 1132 1133 /* Relative to section number */ 1134 for (i = 0; i < ef->nprogtab; i++) { 1135 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) && 1136 strcmp(ef->progtab[i].name + 4, name) == 0) { 1137 start = (void **)ef->progtab[i].addr; 1138 stop = (void **)((char *)ef->progtab[i].addr + 1139 ef->progtab[i].size); 1140 count = stop - start; 1141 if (startp) 1142 *startp = start; 1143 if (stopp) 1144 *stopp = stop; 1145 if (countp) 1146 *countp = count; 1147 return (0); 1148 } 1149 } 1150 return (ESRCH); 1151 } 1152 1153 static int 1154 link_elf_each_function_name(linker_file_t file, 1155 int (*callback)(const char *, void *), void *opaque) 1156 { 1157 elf_file_t ef = (elf_file_t)file; 1158 const Elf_Sym *symp; 1159 int i, error; 1160 1161 /* Exhaustive search */ 1162 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1163 if (symp->st_value != 0 && 1164 ELF_ST_TYPE(symp->st_info) == STT_FUNC) { 1165 error = callback(ef->ddbstrtab + symp->st_name, opaque); 1166 if (error) 1167 return (error); 1168 } 1169 } 1170 return (0); 1171 } 1172 1173 static int 1174 link_elf_each_function_nameval(linker_file_t file, 1175 linker_function_nameval_callback_t callback, void *opaque) 1176 { 1177 linker_symval_t symval; 1178 elf_file_t ef = (elf_file_t)file; 1179 const Elf_Sym* symp; 1180 int i, error; 1181 1182 /* Exhaustive search */ 1183 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) { 1184 if (symp->st_value != 0 && 1185 ELF_ST_TYPE(symp->st_info) == STT_FUNC) { 1186 error = link_elf_symbol_values(file, (c_linker_sym_t) symp, &symval); 1187 if (error) 1188 return (error); 1189 error = callback(file, i, &symval, opaque); 1190 if (error) 1191 return (error); 1192 } 1193 } 1194 return (0); 1195 } 1196 1197 /* 1198 * Symbol lookup function that can be used when the symbol index is known (ie 1199 * in relocations). It uses the symbol index instead of doing a fully fledged 1200 * hash table based lookup when such is valid. For example for local symbols. 1201 * This is not only more efficient, it's also more correct. It's not always 1202 * the case that the symbol can be found through the hash table. 1203 */ 1204 static Elf_Addr 1205 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps) 1206 { 1207 elf_file_t ef = (elf_file_t)lf; 1208 const Elf_Sym *sym; 1209 const char *symbol; 1210 Elf_Addr ret; 1211 1212 /* Don't even try to lookup the symbol if the index is bogus. */ 1213 if (symidx >= ef->ddbsymcnt) 1214 return (0); 1215 1216 sym = ef->ddbsymtab + symidx; 1217 1218 /* Quick answer if there is a definition included. */ 1219 if (sym->st_shndx != SHN_UNDEF) 1220 return (sym->st_value); 1221 1222 /* If we get here, then it is undefined and needs a lookup. */ 1223 switch (ELF_ST_BIND(sym->st_info)) { 1224 case STB_LOCAL: 1225 /* Local, but undefined? huh? */ 1226 return (0); 1227 1228 case STB_GLOBAL: 1229 /* Relative to Data or Function name */ 1230 symbol = ef->ddbstrtab + sym->st_name; 1231 1232 /* Force a lookup failure if the symbol name is bogus. */ 1233 if (*symbol == 0) 1234 return (0); 1235 ret = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps)); 1236 return ret; 1237 1238 case STB_WEAK: 1239 printf("link_elf_obj: Weak symbols not supported\n"); 1240 return (0); 1241 1242 default: 1243 return (0); 1244 } 1245 } 1246 1247 static void 1248 link_elf_fix_link_set(elf_file_t ef) 1249 { 1250 static const char startn[] = "__start_"; 1251 static const char stopn[] = "__stop_"; 1252 Elf_Sym *sym; 1253 const char *sym_name, *linkset_name; 1254 Elf_Addr startp, stopp; 1255 Elf_Size symidx; 1256 int start, i; 1257 1258 startp = stopp = 0; 1259 for (symidx = 1 /* zero entry is special */; 1260 symidx < ef->ddbsymcnt; symidx++) { 1261 sym = ef->ddbsymtab + symidx; 1262 if (sym->st_shndx != SHN_UNDEF) 1263 continue; 1264 1265 sym_name = ef->ddbstrtab + sym->st_name; 1266 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) { 1267 start = 1; 1268 linkset_name = sym_name + sizeof(startn) - 1; 1269 } 1270 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) { 1271 start = 0; 1272 linkset_name = sym_name + sizeof(stopn) - 1; 1273 } 1274 else 1275 continue; 1276 1277 for (i = 0; i < ef->nprogtab; i++) { 1278 if (strcmp(ef->progtab[i].name, linkset_name) == 0) { 1279 startp = (Elf_Addr)ef->progtab[i].addr; 1280 stopp = (Elf_Addr)(startp + ef->progtab[i].size); 1281 break; 1282 } 1283 } 1284 if (i == ef->nprogtab) 1285 continue; 1286 1287 sym->st_value = start ? startp : stopp; 1288 sym->st_shndx = i; 1289 } 1290 } 1291 1292 static void 1293 link_elf_reloc_local(linker_file_t lf) 1294 { 1295 elf_file_t ef = (elf_file_t)lf; 1296 const Elf_Rel *rellim; 1297 const Elf_Rel *rel; 1298 const Elf_Rela *relalim; 1299 const Elf_Rela *rela; 1300 const Elf_Sym *sym; 1301 Elf_Addr base; 1302 int i; 1303 Elf_Size symidx; 1304 1305 link_elf_fix_link_set(ef); 1306 1307 /* Perform relocations without addend if there are any: */ 1308 for (i = 0; i < ef->nreltab; i++) { 1309 rel = ef->reltab[i].rel; 1310 if (rel == NULL) 1311 panic("lost a reltab!"); 1312 rellim = rel + ef->reltab[i].nrel; 1313 base = findbase(ef, ef->reltab[i].sec); 1314 if (base == 0) 1315 panic("lost base for reltab"); 1316 for ( ; rel < rellim; rel++) { 1317 symidx = ELF_R_SYM(rel->r_info); 1318 if (symidx >= ef->ddbsymcnt) 1319 continue; 1320 sym = ef->ddbsymtab + symidx; 1321 /* Only do local relocs */ 1322 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL) 1323 continue; 1324 elf_reloc_local(lf, base, rel, ELF_RELOC_REL, 1325 elf_obj_lookup); 1326 } 1327 } 1328 1329 /* Perform relocations with addend if there are any: */ 1330 for (i = 0; i < ef->nrelatab; i++) { 1331 rela = ef->relatab[i].rela; 1332 if (rela == NULL) 1333 panic("lost a relatab!"); 1334 relalim = rela + ef->relatab[i].nrela; 1335 base = findbase(ef, ef->relatab[i].sec); 1336 if (base == 0) 1337 panic("lost base for relatab"); 1338 for ( ; rela < relalim; rela++) { 1339 symidx = ELF_R_SYM(rela->r_info); 1340 if (symidx >= ef->ddbsymcnt) 1341 continue; 1342 sym = ef->ddbsymtab + symidx; 1343 /* Only do local relocs */ 1344 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL) 1345 continue; 1346 elf_reloc_local(lf, base, rela, ELF_RELOC_RELA, 1347 elf_obj_lookup); 1348 } 1349 } 1350 } 1351 1352 static long 1353 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab) 1354 { 1355 elf_file_t ef = (elf_file_t)lf; 1356 1357 *symtab = ef->ddbsymtab; 1358 1359 if (*symtab == NULL) 1360 return (0); 1361 1362 return (ef->ddbsymcnt); 1363 } 1364 1365 static long 1366 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab) 1367 { 1368 elf_file_t ef = (elf_file_t)lf; 1369 1370 *strtab = ef->ddbstrtab; 1371 1372 if (*strtab == NULL) 1373 return (0); 1374 1375 return (ef->ddbstrcnt); 1376 }
Cache object: eb491907dc8ac74558ff7dd0e289296c
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