1 /*- 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3 * Copyright (c) 1998 Peter Wemm <peter@freebsd.org> 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 <sys/param.h> 32 #include <sys/endian.h> 33 #include <sys/exec.h> 34 #include <sys/linker.h> 35 #include <sys/module.h> 36 #include <sys/stdint.h> 37 #include <string.h> 38 #include <machine/elf.h> 39 #include <stand.h> 40 #define FREEBSD_ELF 41 #include <sys/link_elf.h> 42 43 #include "bootstrap.h" 44 45 #define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l) 46 47 #if defined(__i386__) && __ELF_WORD_SIZE == 64 48 #undef ELF_TARG_CLASS 49 #undef ELF_TARG_MACH 50 #define ELF_TARG_CLASS ELFCLASS64 51 #define ELF_TARG_MACH EM_X86_64 52 #endif 53 54 typedef struct elf_file { 55 Elf_Phdr *ph; 56 Elf_Ehdr *ehdr; 57 Elf_Sym *symtab; 58 Elf_Hashelt *hashtab; 59 Elf_Hashelt nbuckets; 60 Elf_Hashelt nchains; 61 Elf_Hashelt *buckets; 62 Elf_Hashelt *chains; 63 Elf_Rel *rel; 64 size_t relsz; 65 Elf_Rela *rela; 66 size_t relasz; 67 char *strtab; 68 size_t strsz; 69 int fd; 70 caddr_t firstpage; 71 size_t firstlen; 72 int kernel; 73 uint64_t off; 74 #ifdef LOADER_VERIEXEC_VECTX 75 struct vectx *vctx; 76 #endif 77 } *elf_file_t; 78 79 #ifdef LOADER_VERIEXEC_VECTX 80 #define VECTX_HANDLE(ef) (ef)->vctx 81 #else 82 #define VECTX_HANDLE(ef) (ef)->fd 83 #endif 84 85 static int __elfN(loadimage)(struct preloaded_file *mp, elf_file_t ef, 86 uint64_t loadaddr); 87 static int __elfN(lookup_symbol)(elf_file_t ef, const char* name, 88 Elf_Sym *sym, unsigned char type); 89 static int __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef, 90 Elf_Addr p, void *val, size_t len); 91 static int __elfN(parse_modmetadata)(struct preloaded_file *mp, elf_file_t ef, 92 Elf_Addr p_start, Elf_Addr p_end); 93 static symaddr_fn __elfN(symaddr); 94 static char *fake_modname(const char *name); 95 96 const char *__elfN(kerneltype) = "elf kernel"; 97 const char *__elfN(moduletype) = "elf module"; 98 99 uint64_t __elfN(relocation_offset) = 0; 100 101 extern void elf_wrong_field_size(void); 102 #define CONVERT_FIELD(b, f, e) \ 103 switch (sizeof((b)->f)) { \ 104 case 2: \ 105 (b)->f = e ## 16toh((b)->f); \ 106 break; \ 107 case 4: \ 108 (b)->f = e ## 32toh((b)->f); \ 109 break; \ 110 case 8: \ 111 (b)->f = e ## 64toh((b)->f); \ 112 break; \ 113 default: \ 114 /* Force a link time error. */ \ 115 elf_wrong_field_size(); \ 116 break; \ 117 } 118 119 #define CONVERT_SWITCH(h, d, f) \ 120 switch ((h)->e_ident[EI_DATA]) { \ 121 case ELFDATA2MSB: \ 122 f(d, be); \ 123 break; \ 124 case ELFDATA2LSB: \ 125 f(d, le); \ 126 break; \ 127 default: \ 128 return (EINVAL); \ 129 } 130 131 132 static int elf_header_convert(Elf_Ehdr *ehdr) 133 { 134 /* 135 * Fixup ELF header endianness. 136 * 137 * The Xhdr structure was loaded using block read call to optimize file 138 * accesses. It might happen, that the endianness of the system memory 139 * is different that endianness of the ELF header. Swap fields here to 140 * guarantee that Xhdr always contain valid data regardless of 141 * architecture. 142 */ 143 #define HEADER_FIELDS(b, e) \ 144 CONVERT_FIELD(b, e_type, e); \ 145 CONVERT_FIELD(b, e_machine, e); \ 146 CONVERT_FIELD(b, e_version, e); \ 147 CONVERT_FIELD(b, e_entry, e); \ 148 CONVERT_FIELD(b, e_phoff, e); \ 149 CONVERT_FIELD(b, e_shoff, e); \ 150 CONVERT_FIELD(b, e_flags, e); \ 151 CONVERT_FIELD(b, e_ehsize, e); \ 152 CONVERT_FIELD(b, e_phentsize, e); \ 153 CONVERT_FIELD(b, e_phnum, e); \ 154 CONVERT_FIELD(b, e_shentsize, e); \ 155 CONVERT_FIELD(b, e_shnum, e); \ 156 CONVERT_FIELD(b, e_shstrndx, e) 157 158 CONVERT_SWITCH(ehdr, ehdr, HEADER_FIELDS); 159 160 #undef HEADER_FIELDS 161 162 return (0); 163 } 164 165 static int elf_program_header_convert(const Elf_Ehdr *ehdr, Elf_Phdr *phdr) 166 { 167 #define PROGRAM_HEADER_FIELDS(b, e) \ 168 CONVERT_FIELD(b, p_type, e); \ 169 CONVERT_FIELD(b, p_flags, e); \ 170 CONVERT_FIELD(b, p_offset, e); \ 171 CONVERT_FIELD(b, p_vaddr, e); \ 172 CONVERT_FIELD(b, p_paddr, e); \ 173 CONVERT_FIELD(b, p_filesz, e); \ 174 CONVERT_FIELD(b, p_memsz, e); \ 175 CONVERT_FIELD(b, p_align, e) 176 177 CONVERT_SWITCH(ehdr, phdr, PROGRAM_HEADER_FIELDS); 178 179 #undef PROGRAM_HEADER_FIELDS 180 181 return (0); 182 } 183 184 static int elf_section_header_convert(const Elf_Ehdr *ehdr, Elf_Shdr *shdr) 185 { 186 #define SECTION_HEADER_FIELDS(b, e) \ 187 CONVERT_FIELD(b, sh_name, e); \ 188 CONVERT_FIELD(b, sh_type, e); \ 189 CONVERT_FIELD(b, sh_link, e); \ 190 CONVERT_FIELD(b, sh_info, e); \ 191 CONVERT_FIELD(b, sh_flags, e); \ 192 CONVERT_FIELD(b, sh_addr, e); \ 193 CONVERT_FIELD(b, sh_offset, e); \ 194 CONVERT_FIELD(b, sh_size, e); \ 195 CONVERT_FIELD(b, sh_addralign, e); \ 196 CONVERT_FIELD(b, sh_entsize, e) 197 198 CONVERT_SWITCH(ehdr, shdr, SECTION_HEADER_FIELDS); 199 200 #undef SECTION_HEADER_FIELDS 201 202 return (0); 203 } 204 #undef CONVERT_SWITCH 205 #undef CONVERT_FIELD 206 207 208 #ifdef __amd64__ 209 static bool 210 is_kernphys_relocatable(elf_file_t ef) 211 { 212 Elf_Sym sym; 213 214 return (__elfN(lookup_symbol)(ef, "kernphys", &sym, STT_OBJECT) == 0 && 215 sym.st_size == 8); 216 } 217 #endif 218 219 #ifdef __i386__ 220 static bool 221 is_tg_kernel_support(struct preloaded_file *fp, elf_file_t ef) 222 { 223 Elf_Sym sym; 224 Elf_Addr p_start, p_end, v, p; 225 char vd_name[16]; 226 int error; 227 228 if (__elfN(lookup_symbol)(ef, "__start_set_vt_drv_set", &sym, STT_NOTYPE) != 0) 229 return (false); 230 p_start = sym.st_value + ef->off; 231 if (__elfN(lookup_symbol)(ef, "__stop_set_vt_drv_set", &sym, STT_NOTYPE) != 0) 232 return (false); 233 p_end = sym.st_value + ef->off; 234 235 /* 236 * Walk through vt_drv_set, each vt driver structure starts with 237 * static 16 chars for driver name. If we have "vbefb", return true. 238 */ 239 for (p = p_start; p < p_end; p += sizeof(Elf_Addr)) { 240 COPYOUT(p, &v, sizeof(v)); 241 242 error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v)); 243 if (error == EOPNOTSUPP) 244 v += ef->off; 245 else if (error != 0) 246 return (false); 247 COPYOUT(v, &vd_name, sizeof(vd_name)); 248 if (strncmp(vd_name, "vbefb", sizeof(vd_name)) == 0) 249 return (true); 250 } 251 252 return (false); 253 } 254 #endif 255 256 static int 257 __elfN(load_elf_header)(char *filename, elf_file_t ef) 258 { 259 ssize_t bytes_read; 260 Elf_Ehdr *ehdr; 261 int err; 262 263 /* 264 * Open the image, read and validate the ELF header 265 */ 266 if (filename == NULL) /* can't handle nameless */ 267 return (EFTYPE); 268 if ((ef->fd = open(filename, O_RDONLY)) == -1) 269 return (errno); 270 ef->firstpage = malloc(PAGE_SIZE); 271 if (ef->firstpage == NULL) { 272 close(ef->fd); 273 return (ENOMEM); 274 } 275 preload(ef->fd); 276 #ifdef LOADER_VERIEXEC_VECTX 277 { 278 int verror; 279 280 ef->vctx = vectx_open(ef->fd, filename, 0L, NULL, &verror, __func__); 281 if (verror) { 282 printf("Unverified %s: %s\n", filename, ve_error_get()); 283 close(ef->fd); 284 free(ef->vctx); 285 return (EAUTH); 286 } 287 } 288 #endif 289 bytes_read = VECTX_READ(VECTX_HANDLE(ef), ef->firstpage, PAGE_SIZE); 290 ef->firstlen = (size_t)bytes_read; 291 if (bytes_read < 0 || ef->firstlen <= sizeof(Elf_Ehdr)) { 292 err = EFTYPE; /* could be EIO, but may be small file */ 293 goto error; 294 } 295 ehdr = ef->ehdr = (Elf_Ehdr *)ef->firstpage; 296 297 /* Is it ELF? */ 298 if (!IS_ELF(*ehdr)) { 299 err = EFTYPE; 300 goto error; 301 } 302 303 if (ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || /* Layout ? */ 304 ehdr->e_ident[EI_DATA] != ELF_TARG_DATA || 305 ehdr->e_ident[EI_VERSION] != EV_CURRENT) /* Version ? */ { 306 err = EFTYPE; 307 goto error; 308 } 309 310 err = elf_header_convert(ehdr); 311 if (err) 312 goto error; 313 314 if (ehdr->e_version != EV_CURRENT || ehdr->e_machine != ELF_TARG_MACH) { 315 /* Machine ? */ 316 err = EFTYPE; 317 goto error; 318 } 319 320 #if defined(LOADER_VERIEXEC) && !defined(LOADER_VERIEXEC_VECTX) 321 if (verify_file(ef->fd, filename, bytes_read, VE_MUST, __func__) < 0) { 322 err = EAUTH; 323 goto error; 324 } 325 #endif 326 return (0); 327 328 error: 329 if (ef->firstpage != NULL) { 330 free(ef->firstpage); 331 ef->firstpage = NULL; 332 } 333 if (ef->fd != -1) { 334 #ifdef LOADER_VERIEXEC_VECTX 335 free(ef->vctx); 336 #endif 337 close(ef->fd); 338 ef->fd = -1; 339 } 340 return (err); 341 } 342 343 /* 344 * Attempt to load the file (file) as an ELF module. It will be stored at 345 * (dest), and a pointer to a module structure describing the loaded object 346 * will be saved in (result). 347 */ 348 int 349 __elfN(loadfile)(char *filename, uint64_t dest, struct preloaded_file **result) 350 { 351 return (__elfN(loadfile_raw)(filename, dest, result, 0)); 352 } 353 354 int 355 __elfN(loadfile_raw)(char *filename, uint64_t dest, 356 struct preloaded_file **result, int multiboot) 357 { 358 struct preloaded_file *fp, *kfp; 359 struct elf_file ef; 360 Elf_Ehdr *ehdr; 361 int err; 362 363 fp = NULL; 364 bzero(&ef, sizeof(struct elf_file)); 365 ef.fd = -1; 366 367 err = __elfN(load_elf_header)(filename, &ef); 368 if (err != 0) 369 return (err); 370 371 ehdr = ef.ehdr; 372 373 /* 374 * Check to see what sort of module we are. 375 */ 376 kfp = file_findfile(NULL, __elfN(kerneltype)); 377 #ifdef __powerpc__ 378 /* 379 * Kernels can be ET_DYN, so just assume the first loaded object is the 380 * kernel. This assumption will be checked later. 381 */ 382 if (kfp == NULL) 383 ef.kernel = 1; 384 #endif 385 if (ef.kernel || ehdr->e_type == ET_EXEC) { 386 /* Looks like a kernel */ 387 if (kfp != NULL) { 388 printf("elf" __XSTRING(__ELF_WORD_SIZE) 389 "_loadfile: kernel already loaded\n"); 390 err = EPERM; 391 goto oerr; 392 } 393 /* 394 * Calculate destination address based on kernel entrypoint. 395 * 396 * For ARM, the destination address is independent of any values 397 * in the elf header (an ARM kernel can be loaded at any 2MB 398 * boundary), so we leave dest set to the value calculated by 399 * archsw.arch_loadaddr() and passed in to this function. 400 */ 401 #ifndef __arm__ 402 if (ehdr->e_type == ET_EXEC) 403 dest = (ehdr->e_entry & ~PAGE_MASK); 404 #endif 405 if ((ehdr->e_entry & ~PAGE_MASK) == 0) { 406 printf("elf" __XSTRING(__ELF_WORD_SIZE) 407 "_loadfile: not a kernel (maybe static binary?)\n"); 408 err = EPERM; 409 goto oerr; 410 } 411 ef.kernel = 1; 412 413 } else if (ehdr->e_type == ET_DYN) { 414 /* Looks like a kld module */ 415 if (multiboot != 0) { 416 printf("elf" __XSTRING(__ELF_WORD_SIZE) 417 "_loadfile: can't load module as multiboot\n"); 418 err = EPERM; 419 goto oerr; 420 } 421 if (kfp == NULL) { 422 printf("elf" __XSTRING(__ELF_WORD_SIZE) 423 "_loadfile: can't load module before kernel\n"); 424 err = EPERM; 425 goto oerr; 426 } 427 if (strcmp(__elfN(kerneltype), kfp->f_type)) { 428 printf("elf" __XSTRING(__ELF_WORD_SIZE) 429 "_loadfile: can't load module with kernel type '%s'\n", 430 kfp->f_type); 431 err = EPERM; 432 goto oerr; 433 } 434 /* Looks OK, got ahead */ 435 ef.kernel = 0; 436 437 } else { 438 err = EFTYPE; 439 goto oerr; 440 } 441 442 if (archsw.arch_loadaddr != NULL) 443 dest = archsw.arch_loadaddr(LOAD_ELF, ehdr, dest); 444 else 445 dest = roundup(dest, PAGE_SIZE); 446 447 /* 448 * Ok, we think we should handle this. 449 */ 450 fp = file_alloc(); 451 if (fp == NULL) { 452 printf("elf" __XSTRING(__ELF_WORD_SIZE) 453 "_loadfile: cannot allocate module info\n"); 454 err = EPERM; 455 goto out; 456 } 457 if (ef.kernel == 1 && multiboot == 0) 458 setenv("kernelname", filename, 1); 459 fp->f_name = strdup(filename); 460 if (multiboot == 0) 461 fp->f_type = strdup(ef.kernel ? 462 __elfN(kerneltype) : __elfN(moduletype)); 463 else 464 fp->f_type = strdup("elf multiboot kernel"); 465 466 if (module_verbose >= MODULE_VERBOSE_FULL) { 467 if (ef.kernel) 468 printf("%s entry at 0x%jx\n", filename, 469 (uintmax_t)ehdr->e_entry); 470 } else if (module_verbose > MODULE_VERBOSE_SILENT) 471 printf("%s ", filename); 472 473 if (module_verbose < MODULE_VERBOSE_TWIDDLE) { 474 /* A hack for now; we do not want twiddling */ 475 twiddle_divisor(UINT_MAX); 476 } 477 478 fp->f_size = __elfN(loadimage)(fp, &ef, dest); 479 if (fp->f_size == 0 || fp->f_addr == 0) 480 goto ioerr; 481 482 /* save exec header as metadata */ 483 file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof(*ehdr), ehdr); 484 485 /* Load OK, return module pointer */ 486 *result = (struct preloaded_file *)fp; 487 err = 0; 488 #ifdef __amd64__ 489 fp->f_kernphys_relocatable = multiboot || is_kernphys_relocatable(&ef); 490 #endif 491 #ifdef __i386__ 492 fp->f_tg_kernel_support = is_tg_kernel_support(fp, &ef); 493 #endif 494 goto out; 495 496 ioerr: 497 err = EIO; 498 oerr: 499 file_discard(fp); 500 out: 501 if (ef.firstpage) 502 free(ef.firstpage); 503 if (ef.fd != -1) { 504 #ifdef LOADER_VERIEXEC_VECTX 505 if (!err && ef.vctx) { 506 int verror; 507 508 verror = vectx_close(ef.vctx, VE_MUST, __func__); 509 if (verror) { 510 err = EAUTH; 511 file_discard(fp); 512 } 513 } 514 #endif 515 close(ef.fd); 516 } 517 return (err); 518 } 519 520 /* 521 * With the file (fd) open on the image, and (ehdr) containing 522 * the Elf header, load the image at (off) 523 */ 524 static int 525 __elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, uint64_t off) 526 { 527 int i; 528 u_int j; 529 Elf_Ehdr *ehdr; 530 Elf_Phdr *phdr, *php; 531 Elf_Shdr *shdr; 532 char *shstr; 533 int ret; 534 vm_offset_t firstaddr; 535 vm_offset_t lastaddr; 536 size_t chunk; 537 ssize_t result; 538 Elf_Addr ssym, esym; 539 Elf_Dyn *dp; 540 Elf_Addr adp; 541 Elf_Addr ctors; 542 int ndp; 543 int symstrindex; 544 int symtabindex; 545 Elf_Size size; 546 u_int fpcopy; 547 Elf_Sym sym; 548 Elf_Addr p_start, p_end; 549 550 dp = NULL; 551 shdr = NULL; 552 ret = 0; 553 firstaddr = lastaddr = 0; 554 ehdr = ef->ehdr; 555 #ifdef __powerpc__ 556 if (ef->kernel) { 557 #else 558 if (ehdr->e_type == ET_EXEC) { 559 #endif 560 #if defined(__i386__) || defined(__amd64__) 561 #if __ELF_WORD_SIZE == 64 562 /* x86_64 relocates after locore */ 563 off = - (off & 0xffffffffff000000ull); 564 #else 565 /* i386 relocates after locore */ 566 off = - (off & 0xff000000u); 567 #endif 568 #elif defined(__powerpc__) 569 /* 570 * On the purely virtual memory machines like e500, the kernel 571 * is linked against its final VA range, which is most often 572 * not available at the loader stage, but only after kernel 573 * initializes and completes its VM settings. In such cases we 574 * cannot use p_vaddr field directly to load ELF segments, but 575 * put them at some 'load-time' locations. 576 */ 577 if (off & 0xf0000000u) { 578 off = -(off & 0xf0000000u); 579 /* 580 * XXX the physical load address should not be 581 * hardcoded. Note that the Book-E kernel assumes that 582 * it's loaded at a 16MB boundary for now... 583 */ 584 off += 0x01000000; 585 } 586 ehdr->e_entry += off; 587 if (module_verbose >= MODULE_VERBOSE_FULL) 588 printf("Converted entry 0x%jx\n", 589 (uintmax_t)ehdr->e_entry); 590 591 #elif defined(__arm__) && !defined(EFI) 592 /* 593 * The elf headers in arm kernels specify virtual addresses in 594 * all header fields, even the ones that should be physical 595 * addresses. We assume the entry point is in the first page, 596 * and masking the page offset will leave us with the virtual 597 * address the kernel was linked at. We subtract that from the 598 * load offset, making 'off' into the value which, when added 599 * to a virtual address in an elf header, translates it to a 600 * physical address. We do the va->pa conversion on the entry 601 * point address in the header now, so that later we can launch 602 * the kernel by just jumping to that address. 603 * 604 * When booting from UEFI the copyin and copyout functions 605 * handle adjusting the location relative to the first virtual 606 * address. Because of this there is no need to adjust the 607 * offset or entry point address as these will both be handled 608 * by the efi code. 609 */ 610 off -= ehdr->e_entry & ~PAGE_MASK; 611 ehdr->e_entry += off; 612 if (module_verbose >= MODULE_VERBOSE_FULL) 613 printf("ehdr->e_entry 0x%jx, va<->pa off %llx\n", 614 (uintmax_t)ehdr->e_entry, off); 615 #else 616 off = 0; /* other archs use direct mapped kernels */ 617 #endif 618 } 619 ef->off = off; 620 621 if (ef->kernel) 622 __elfN(relocation_offset) = off; 623 624 if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) { 625 printf("elf" __XSTRING(__ELF_WORD_SIZE) 626 "_loadimage: program header not within first page\n"); 627 goto out; 628 } 629 phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff); 630 631 for (i = 0; i < ehdr->e_phnum; i++) { 632 if (elf_program_header_convert(ehdr, phdr)) 633 continue; 634 635 /* We want to load PT_LOAD segments only.. */ 636 if (phdr[i].p_type != PT_LOAD) 637 continue; 638 639 if (module_verbose >= MODULE_VERBOSE_FULL) { 640 printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx", 641 (long)phdr[i].p_filesz, (long)phdr[i].p_offset, 642 (long)(phdr[i].p_vaddr + off), 643 (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1)); 644 } else if (module_verbose > MODULE_VERBOSE_SILENT) { 645 if ((phdr[i].p_flags & PF_W) == 0) { 646 printf("text=0x%lx ", (long)phdr[i].p_filesz); 647 } else { 648 printf("data=0x%lx", (long)phdr[i].p_filesz); 649 if (phdr[i].p_filesz < phdr[i].p_memsz) 650 printf("+0x%lx", (long)(phdr[i].p_memsz - 651 phdr[i].p_filesz)); 652 printf(" "); 653 } 654 } 655 fpcopy = 0; 656 if (ef->firstlen > phdr[i].p_offset) { 657 fpcopy = ef->firstlen - phdr[i].p_offset; 658 archsw.arch_copyin(ef->firstpage + phdr[i].p_offset, 659 phdr[i].p_vaddr + off, fpcopy); 660 } 661 if (phdr[i].p_filesz > fpcopy) { 662 if (kern_pread(VECTX_HANDLE(ef), 663 phdr[i].p_vaddr + off + fpcopy, 664 phdr[i].p_filesz - fpcopy, 665 phdr[i].p_offset + fpcopy) != 0) { 666 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 667 "_loadimage: read failed\n"); 668 goto out; 669 } 670 } 671 /* clear space from oversized segments; eg: bss */ 672 if (phdr[i].p_filesz < phdr[i].p_memsz) { 673 if (module_verbose >= MODULE_VERBOSE_FULL) { 674 printf(" (bss: 0x%lx-0x%lx)", 675 (long)(phdr[i].p_vaddr + off + phdr[i].p_filesz), 676 (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz -1)); 677 } 678 kern_bzero(phdr[i].p_vaddr + off + phdr[i].p_filesz, 679 phdr[i].p_memsz - phdr[i].p_filesz); 680 } 681 if (module_verbose >= MODULE_VERBOSE_FULL) 682 printf("\n"); 683 684 if (archsw.arch_loadseg != NULL) 685 archsw.arch_loadseg(ehdr, phdr + i, off); 686 687 if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off)) 688 firstaddr = phdr[i].p_vaddr + off; 689 if (lastaddr == 0 || lastaddr < 690 (phdr[i].p_vaddr + off + phdr[i].p_memsz)) 691 lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz; 692 } 693 lastaddr = roundup(lastaddr, sizeof(long)); 694 695 /* 696 * Get the section headers. We need this for finding the .ctors 697 * section as well as for loading any symbols. Both may be hard 698 * to do if reading from a .gz file as it involves seeking. I 699 * think the rule is going to have to be that you must strip a 700 * file to remove symbols before gzipping it. 701 */ 702 chunk = (size_t)ehdr->e_shnum * (size_t)ehdr->e_shentsize; 703 if (chunk == 0 || ehdr->e_shoff == 0) 704 goto nosyms; 705 shdr = alloc_pread(VECTX_HANDLE(ef), ehdr->e_shoff, chunk); 706 if (shdr == NULL) { 707 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 708 "_loadimage: failed to read section headers"); 709 goto nosyms; 710 } 711 712 for (i = 0; i < ehdr->e_shnum; i++) 713 elf_section_header_convert(ehdr, &shdr[i]); 714 715 file_addmetadata(fp, MODINFOMD_SHDR, chunk, shdr); 716 717 /* 718 * Read the section string table and look for the .ctors section. 719 * We need to tell the kernel where it is so that it can call the 720 * ctors. 721 */ 722 chunk = shdr[ehdr->e_shstrndx].sh_size; 723 if (chunk) { 724 shstr = alloc_pread(VECTX_HANDLE(ef), 725 shdr[ehdr->e_shstrndx].sh_offset, chunk); 726 if (shstr) { 727 for (i = 0; i < ehdr->e_shnum; i++) { 728 if (strcmp(shstr + shdr[i].sh_name, 729 ".ctors") != 0) 730 continue; 731 ctors = shdr[i].sh_addr; 732 file_addmetadata(fp, MODINFOMD_CTORS_ADDR, 733 sizeof(ctors), &ctors); 734 size = shdr[i].sh_size; 735 file_addmetadata(fp, MODINFOMD_CTORS_SIZE, 736 sizeof(size), &size); 737 break; 738 } 739 free(shstr); 740 } 741 } 742 743 /* 744 * Now load any symbols. 745 */ 746 symtabindex = -1; 747 symstrindex = -1; 748 for (i = 0; i < ehdr->e_shnum; i++) { 749 if (shdr[i].sh_type != SHT_SYMTAB) 750 continue; 751 for (j = 0; j < ehdr->e_phnum; j++) { 752 if (phdr[j].p_type != PT_LOAD) 753 continue; 754 if (shdr[i].sh_offset >= phdr[j].p_offset && 755 (shdr[i].sh_offset + shdr[i].sh_size <= 756 phdr[j].p_offset + phdr[j].p_filesz)) { 757 shdr[i].sh_offset = 0; 758 shdr[i].sh_size = 0; 759 break; 760 } 761 } 762 if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0) 763 continue; /* alread loaded in a PT_LOAD above */ 764 /* Save it for loading below */ 765 symtabindex = i; 766 symstrindex = shdr[i].sh_link; 767 } 768 if (symtabindex < 0 || symstrindex < 0) 769 goto nosyms; 770 771 /* Ok, committed to a load. */ 772 if (module_verbose >= MODULE_VERBOSE_FULL) 773 printf("syms=["); 774 ssym = lastaddr; 775 for (i = symtabindex; i >= 0; i = symstrindex) { 776 char *secname; 777 778 switch(shdr[i].sh_type) { 779 case SHT_SYMTAB: /* Symbol table */ 780 secname = "symtab"; 781 break; 782 case SHT_STRTAB: /* String table */ 783 secname = "strtab"; 784 break; 785 default: 786 secname = "WHOA!!"; 787 break; 788 } 789 size = shdr[i].sh_size; 790 791 archsw.arch_copyin(&size, lastaddr, sizeof(size)); 792 lastaddr += sizeof(size); 793 794 if (module_verbose >= MODULE_VERBOSE_FULL) { 795 printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname, 796 (uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset, 797 (uintmax_t)lastaddr, 798 (uintmax_t)(lastaddr + shdr[i].sh_size)); 799 } else if (module_verbose > MODULE_VERBOSE_SILENT) { 800 if (i == symstrindex) 801 printf("+"); 802 printf("0x%lx+0x%lx", (long)sizeof(size), (long)size); 803 } 804 if (VECTX_LSEEK(VECTX_HANDLE(ef), (off_t)shdr[i].sh_offset, SEEK_SET) == -1) { 805 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 806 "_loadimage: could not seek for symbols - skipped!"); 807 lastaddr = ssym; 808 ssym = 0; 809 goto nosyms; 810 } 811 result = archsw.arch_readin(VECTX_HANDLE(ef), lastaddr, shdr[i].sh_size); 812 if (result < 0 || (size_t)result != shdr[i].sh_size) { 813 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 814 "_loadimage: could not read symbols - skipped! " 815 "(%ju != %ju)", (uintmax_t)result, 816 (uintmax_t)shdr[i].sh_size); 817 lastaddr = ssym; 818 ssym = 0; 819 goto nosyms; 820 } 821 /* Reset offsets relative to ssym */ 822 lastaddr += shdr[i].sh_size; 823 lastaddr = roundup(lastaddr, sizeof(size)); 824 if (i == symtabindex) 825 symtabindex = -1; 826 else if (i == symstrindex) 827 symstrindex = -1; 828 } 829 esym = lastaddr; 830 if (module_verbose >= MODULE_VERBOSE_FULL) 831 printf("]"); 832 833 file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym); 834 file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym); 835 836 nosyms: 837 if (module_verbose > MODULE_VERBOSE_SILENT) 838 printf("\n"); 839 840 ret = lastaddr - firstaddr; 841 fp->f_addr = firstaddr; 842 843 php = NULL; 844 for (i = 0; i < ehdr->e_phnum; i++) { 845 if (phdr[i].p_type == PT_DYNAMIC) { 846 php = phdr + i; 847 adp = php->p_vaddr; 848 file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(adp), 849 &adp); 850 break; 851 } 852 } 853 854 if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */ 855 goto out; 856 857 ndp = php->p_filesz / sizeof(Elf_Dyn); 858 if (ndp == 0) 859 goto out; 860 dp = malloc(php->p_filesz); 861 if (dp == NULL) 862 goto out; 863 archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz); 864 865 ef->strsz = 0; 866 for (i = 0; i < ndp; i++) { 867 if (dp[i].d_tag == 0) 868 break; 869 switch (dp[i].d_tag) { 870 case DT_HASH: 871 ef->hashtab = 872 (Elf_Hashelt*)(uintptr_t)(dp[i].d_un.d_ptr + off); 873 break; 874 case DT_STRTAB: 875 ef->strtab = 876 (char *)(uintptr_t)(dp[i].d_un.d_ptr + off); 877 break; 878 case DT_STRSZ: 879 ef->strsz = dp[i].d_un.d_val; 880 break; 881 case DT_SYMTAB: 882 ef->symtab = 883 (Elf_Sym *)(uintptr_t)(dp[i].d_un.d_ptr + off); 884 break; 885 case DT_REL: 886 ef->rel = 887 (Elf_Rel *)(uintptr_t)(dp[i].d_un.d_ptr + off); 888 break; 889 case DT_RELSZ: 890 ef->relsz = dp[i].d_un.d_val; 891 break; 892 case DT_RELA: 893 ef->rela = 894 (Elf_Rela *)(uintptr_t)(dp[i].d_un.d_ptr + off); 895 break; 896 case DT_RELASZ: 897 ef->relasz = dp[i].d_un.d_val; 898 break; 899 default: 900 break; 901 } 902 } 903 if (ef->hashtab == NULL || ef->symtab == NULL || 904 ef->strtab == NULL || ef->strsz == 0) 905 goto out; 906 COPYOUT(ef->hashtab, &ef->nbuckets, sizeof(ef->nbuckets)); 907 COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof(ef->nchains)); 908 ef->buckets = ef->hashtab + 2; 909 ef->chains = ef->buckets + ef->nbuckets; 910 911 if (__elfN(lookup_symbol)(ef, "__start_set_modmetadata_set", &sym, 912 STT_NOTYPE) != 0) 913 return 0; 914 p_start = sym.st_value + ef->off; 915 if (__elfN(lookup_symbol)(ef, "__stop_set_modmetadata_set", &sym, 916 STT_NOTYPE) != 0) 917 return 0; 918 p_end = sym.st_value + ef->off; 919 920 if (__elfN(parse_modmetadata)(fp, ef, p_start, p_end) == 0) 921 goto out; 922 923 if (ef->kernel) /* kernel must not depend on anything */ 924 goto out; 925 926 out: 927 if (dp) 928 free(dp); 929 if (shdr) 930 free(shdr); 931 return ret; 932 } 933 934 static char invalid_name[] = "bad"; 935 936 char * 937 fake_modname(const char *name) 938 { 939 const char *sp, *ep; 940 char *fp; 941 size_t len; 942 943 sp = strrchr(name, '/'); 944 if (sp) 945 sp++; 946 else 947 sp = name; 948 949 ep = strrchr(sp, '.'); 950 if (ep == NULL) { 951 ep = sp + strlen(sp); 952 } 953 if (ep == sp) { 954 sp = invalid_name; 955 ep = invalid_name + sizeof(invalid_name) - 1; 956 } 957 958 len = ep - sp; 959 fp = malloc(len + 1); 960 if (fp == NULL) 961 return NULL; 962 memcpy(fp, sp, len); 963 fp[len] = '\0'; 964 return fp; 965 } 966 967 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64 968 struct mod_metadata64 { 969 int md_version; /* structure version MDTV_* */ 970 int md_type; /* type of entry MDT_* */ 971 uint64_t md_data; /* specific data */ 972 uint64_t md_cval; /* common string label */ 973 }; 974 #endif 975 #if defined(__amd64__) && __ELF_WORD_SIZE == 32 976 struct mod_metadata32 { 977 int md_version; /* structure version MDTV_* */ 978 int md_type; /* type of entry MDT_* */ 979 uint32_t md_data; /* specific data */ 980 uint32_t md_cval; /* common string label */ 981 }; 982 #endif 983 984 int 985 __elfN(load_modmetadata)(struct preloaded_file *fp, uint64_t dest) 986 { 987 struct elf_file ef; 988 int err, i, j; 989 Elf_Shdr *sh_meta, *shdr = NULL; 990 Elf_Shdr *sh_data[2]; 991 char *shstrtab = NULL; 992 size_t size; 993 Elf_Addr p_start, p_end; 994 995 bzero(&ef, sizeof(struct elf_file)); 996 ef.fd = -1; 997 998 err = __elfN(load_elf_header)(fp->f_name, &ef); 999 if (err != 0) 1000 goto out; 1001 1002 if (ef.kernel == 1 || ef.ehdr->e_type == ET_EXEC) { 1003 ef.kernel = 1; 1004 } else if (ef.ehdr->e_type != ET_DYN) { 1005 err = EFTYPE; 1006 goto out; 1007 } 1008 1009 size = (size_t)ef.ehdr->e_shnum * (size_t)ef.ehdr->e_shentsize; 1010 shdr = alloc_pread(VECTX_HANDLE(&ef), ef.ehdr->e_shoff, size); 1011 if (shdr == NULL) { 1012 err = ENOMEM; 1013 goto out; 1014 } 1015 1016 /* Load shstrtab. */ 1017 shstrtab = alloc_pread(VECTX_HANDLE(&ef), shdr[ef.ehdr->e_shstrndx].sh_offset, 1018 shdr[ef.ehdr->e_shstrndx].sh_size); 1019 if (shstrtab == NULL) { 1020 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 1021 "load_modmetadata: unable to load shstrtab\n"); 1022 err = EFTYPE; 1023 goto out; 1024 } 1025 1026 /* Find set_modmetadata_set and data sections. */ 1027 sh_data[0] = sh_data[1] = sh_meta = NULL; 1028 for (i = 0, j = 0; i < ef.ehdr->e_shnum; i++) { 1029 if (strcmp(&shstrtab[shdr[i].sh_name], 1030 "set_modmetadata_set") == 0) { 1031 sh_meta = &shdr[i]; 1032 } 1033 if ((strcmp(&shstrtab[shdr[i].sh_name], ".data") == 0) || 1034 (strcmp(&shstrtab[shdr[i].sh_name], ".rodata") == 0)) { 1035 sh_data[j++] = &shdr[i]; 1036 } 1037 } 1038 if (sh_meta == NULL || sh_data[0] == NULL || sh_data[1] == NULL) { 1039 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 1040 "load_modmetadata: unable to find set_modmetadata_set or data sections\n"); 1041 err = EFTYPE; 1042 goto out; 1043 } 1044 1045 /* Load set_modmetadata_set into memory */ 1046 err = kern_pread(VECTX_HANDLE(&ef), dest, sh_meta->sh_size, sh_meta->sh_offset); 1047 if (err != 0) { 1048 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 1049 "load_modmetadata: unable to load set_modmetadata_set: %d\n", err); 1050 goto out; 1051 } 1052 p_start = dest; 1053 p_end = dest + sh_meta->sh_size; 1054 dest += sh_meta->sh_size; 1055 1056 /* Load data sections into memory. */ 1057 err = kern_pread(VECTX_HANDLE(&ef), dest, sh_data[0]->sh_size, 1058 sh_data[0]->sh_offset); 1059 if (err != 0) { 1060 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 1061 "load_modmetadata: unable to load data: %d\n", err); 1062 goto out; 1063 } 1064 1065 /* 1066 * We have to increment the dest, so that the offset is the same into 1067 * both the .rodata and .data sections. 1068 */ 1069 ef.off = -(sh_data[0]->sh_addr - dest); 1070 dest += (sh_data[1]->sh_addr - sh_data[0]->sh_addr); 1071 1072 err = kern_pread(VECTX_HANDLE(&ef), dest, sh_data[1]->sh_size, 1073 sh_data[1]->sh_offset); 1074 if (err != 0) { 1075 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 1076 "load_modmetadata: unable to load data: %d\n", err); 1077 goto out; 1078 } 1079 1080 err = __elfN(parse_modmetadata)(fp, &ef, p_start, p_end); 1081 if (err != 0) { 1082 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 1083 "load_modmetadata: unable to parse metadata: %d\n", err); 1084 goto out; 1085 } 1086 1087 out: 1088 if (shstrtab != NULL) 1089 free(shstrtab); 1090 if (shdr != NULL) 1091 free(shdr); 1092 if (ef.firstpage != NULL) 1093 free(ef.firstpage); 1094 if (ef.fd != -1) { 1095 #ifdef LOADER_VERIEXEC_VECTX 1096 if (!err && ef.vctx) { 1097 int verror; 1098 1099 verror = vectx_close(ef.vctx, VE_MUST, __func__); 1100 if (verror) { 1101 err = EAUTH; 1102 file_discard(fp); 1103 } 1104 } 1105 #endif 1106 close(ef.fd); 1107 } 1108 return (err); 1109 } 1110 1111 int 1112 __elfN(parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef, 1113 Elf_Addr p_start, Elf_Addr p_end) 1114 { 1115 struct mod_metadata md; 1116 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64 1117 struct mod_metadata64 md64; 1118 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32 1119 struct mod_metadata32 md32; 1120 #endif 1121 struct mod_depend *mdepend; 1122 struct mod_version mver; 1123 char *s; 1124 int error, modcnt, minfolen; 1125 Elf_Addr v, p; 1126 1127 modcnt = 0; 1128 p = p_start; 1129 while (p < p_end) { 1130 COPYOUT(p, &v, sizeof(v)); 1131 error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v)); 1132 if (error == EOPNOTSUPP) 1133 v += ef->off; 1134 else if (error != 0) 1135 return (error); 1136 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64 1137 COPYOUT(v, &md64, sizeof(md64)); 1138 error = __elfN(reloc_ptr)(fp, ef, v, &md64, sizeof(md64)); 1139 if (error == EOPNOTSUPP) { 1140 md64.md_cval += ef->off; 1141 md64.md_data += ef->off; 1142 } else if (error != 0) 1143 return (error); 1144 md.md_version = md64.md_version; 1145 md.md_type = md64.md_type; 1146 md.md_cval = (const char *)(uintptr_t)md64.md_cval; 1147 md.md_data = (void *)(uintptr_t)md64.md_data; 1148 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32 1149 COPYOUT(v, &md32, sizeof(md32)); 1150 error = __elfN(reloc_ptr)(fp, ef, v, &md32, sizeof(md32)); 1151 if (error == EOPNOTSUPP) { 1152 md32.md_cval += ef->off; 1153 md32.md_data += ef->off; 1154 } else if (error != 0) 1155 return (error); 1156 md.md_version = md32.md_version; 1157 md.md_type = md32.md_type; 1158 md.md_cval = (const char *)(uintptr_t)md32.md_cval; 1159 md.md_data = (void *)(uintptr_t)md32.md_data; 1160 #else 1161 COPYOUT(v, &md, sizeof(md)); 1162 error = __elfN(reloc_ptr)(fp, ef, v, &md, sizeof(md)); 1163 if (error == EOPNOTSUPP) { 1164 md.md_cval += ef->off; 1165 md.md_data = (void *)((uintptr_t)md.md_data + 1166 (uintptr_t)ef->off); 1167 } else if (error != 0) 1168 return (error); 1169 #endif 1170 p += sizeof(Elf_Addr); 1171 switch(md.md_type) { 1172 case MDT_DEPEND: 1173 if (ef->kernel) /* kernel must not depend on anything */ 1174 break; 1175 s = strdupout((vm_offset_t)md.md_cval); 1176 minfolen = sizeof(*mdepend) + strlen(s) + 1; 1177 mdepend = malloc(minfolen); 1178 if (mdepend == NULL) 1179 return ENOMEM; 1180 COPYOUT((vm_offset_t)md.md_data, mdepend, 1181 sizeof(*mdepend)); 1182 strcpy((char*)(mdepend + 1), s); 1183 free(s); 1184 file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen, 1185 mdepend); 1186 free(mdepend); 1187 break; 1188 case MDT_VERSION: 1189 s = strdupout((vm_offset_t)md.md_cval); 1190 COPYOUT((vm_offset_t)md.md_data, &mver, sizeof(mver)); 1191 file_addmodule(fp, s, mver.mv_version, NULL); 1192 free(s); 1193 modcnt++; 1194 break; 1195 } 1196 } 1197 if (modcnt == 0) { 1198 s = fake_modname(fp->f_name); 1199 file_addmodule(fp, s, 1, NULL); 1200 free(s); 1201 } 1202 return 0; 1203 } 1204 1205 static unsigned long 1206 elf_hash(const char *name) 1207 { 1208 const unsigned char *p = (const unsigned char *) name; 1209 unsigned long h = 0; 1210 unsigned long g; 1211 1212 while (*p != '\0') { 1213 h = (h << 4) + *p++; 1214 if ((g = h & 0xf0000000) != 0) 1215 h ^= g >> 24; 1216 h &= ~g; 1217 } 1218 return h; 1219 } 1220 1221 static const char __elfN(bad_symtable)[] = "elf" __XSTRING(__ELF_WORD_SIZE) 1222 "_lookup_symbol: corrupt symbol table\n"; 1223 int 1224 __elfN(lookup_symbol)(elf_file_t ef, const char* name, Elf_Sym *symp, 1225 unsigned char type) 1226 { 1227 Elf_Hashelt symnum; 1228 Elf_Sym sym; 1229 char *strp; 1230 unsigned long hash; 1231 1232 if (ef->nbuckets == 0) { 1233 printf(__elfN(bad_symtable)); 1234 return ENOENT; 1235 } 1236 1237 hash = elf_hash(name); 1238 COPYOUT(&ef->buckets[hash % ef->nbuckets], &symnum, sizeof(symnum)); 1239 1240 while (symnum != STN_UNDEF) { 1241 if (symnum >= ef->nchains) { 1242 printf(__elfN(bad_symtable)); 1243 return ENOENT; 1244 } 1245 1246 COPYOUT(ef->symtab + symnum, &sym, sizeof(sym)); 1247 if (sym.st_name == 0) { 1248 printf(__elfN(bad_symtable)); 1249 return ENOENT; 1250 } 1251 1252 strp = strdupout((vm_offset_t)(ef->strtab + sym.st_name)); 1253 if (strcmp(name, strp) == 0) { 1254 free(strp); 1255 if (sym.st_shndx != SHN_UNDEF || 1256 (sym.st_value != 0 && 1257 ELF_ST_TYPE(sym.st_info) == type)) { 1258 *symp = sym; 1259 return 0; 1260 } 1261 return ENOENT; 1262 } 1263 free(strp); 1264 COPYOUT(&ef->chains[symnum], &symnum, sizeof(symnum)); 1265 } 1266 return ENOENT; 1267 } 1268 1269 /* 1270 * Apply any intra-module relocations to the value. p is the load address 1271 * of the value and val/len is the value to be modified. This does NOT modify 1272 * the image in-place, because this is done by kern_linker later on. 1273 * 1274 * Returns EOPNOTSUPP if no relocation method is supplied. 1275 */ 1276 static int 1277 __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef, 1278 Elf_Addr p, void *val, size_t len) 1279 { 1280 size_t n; 1281 Elf_Rela a; 1282 Elf_Rel r; 1283 int error; 1284 1285 /* 1286 * The kernel is already relocated, but we still want to apply 1287 * offset adjustments. 1288 */ 1289 if (ef->kernel) 1290 return (EOPNOTSUPP); 1291 1292 for (n = 0; n < ef->relsz / sizeof(r); n++) { 1293 COPYOUT(ef->rel + n, &r, sizeof(r)); 1294 1295 error = __elfN(reloc)(ef, __elfN(symaddr), &r, ELF_RELOC_REL, 1296 ef->off, p, val, len); 1297 if (error != 0) 1298 return (error); 1299 } 1300 for (n = 0; n < ef->relasz / sizeof(a); n++) { 1301 COPYOUT(ef->rela + n, &a, sizeof(a)); 1302 1303 error = __elfN(reloc)(ef, __elfN(symaddr), &a, ELF_RELOC_RELA, 1304 ef->off, p, val, len); 1305 if (error != 0) 1306 return (error); 1307 } 1308 1309 return (0); 1310 } 1311 1312 static Elf_Addr 1313 __elfN(symaddr)(struct elf_file *ef, Elf_Size symidx) 1314 { 1315 1316 /* Symbol lookup by index not required here. */ 1317 return (0); 1318 } 1319