1 /* $NetBSD: loadfile_elf32.c,v 1.33 2016/12/03 09:20:55 maxv Exp $ */ 2 3 /* 4 * Copyright (c) 1997, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center and by Christos Zoulas. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* If not included by exec_elf64.c, ELFSIZE won't be defined. */ 34 #ifndef ELFSIZE 35 #define ELFSIZE 32 36 #endif 37 38 #ifdef _STANDALONE 39 #include <lib/libsa/stand.h> 40 #include <lib/libkern/libkern.h> 41 #else 42 #include <stdio.h> 43 #include <string.h> 44 #include <errno.h> 45 #include <stdlib.h> 46 #include <unistd.h> 47 #include <fcntl.h> 48 #include <err.h> 49 #endif 50 51 #include <sys/param.h> 52 #include <sys/exec.h> 53 54 #include "loadfile.h" 55 56 #if ((ELFSIZE == 32) && defined(BOOT_ELF32)) || \ 57 ((ELFSIZE == 64) && defined(BOOT_ELF64)) 58 59 #define ELFROUND (ELFSIZE / 8) 60 61 #ifndef _STANDALONE 62 #include "byteorder.h" 63 64 /* 65 * Byte swapping may be necessary in the non-_STANDLONE case because 66 * we may be built with a host compiler. 67 */ 68 #define E16(f) \ 69 f = (bo == ELFDATA2LSB) ? sa_htole16(f) : sa_htobe16(f) 70 #define E32(f) \ 71 f = (bo == ELFDATA2LSB) ? sa_htole32(f) : sa_htobe32(f) 72 #define E64(f) \ 73 f = (bo == ELFDATA2LSB) ? sa_htole64(f) : sa_htobe64(f) 74 75 #define I16(f) \ 76 f = (bo == ELFDATA2LSB) ? sa_le16toh(f) : sa_be16toh(f) 77 #define I32(f) \ 78 f = (bo == ELFDATA2LSB) ? sa_le32toh(f) : sa_be32toh(f) 79 #define I64(f) \ 80 f = (bo == ELFDATA2LSB) ? sa_le64toh(f) : sa_be64toh(f) 81 82 static void 83 internalize_ehdr(Elf_Byte bo, Elf_Ehdr *ehdr) 84 { 85 86 #if ELFSIZE == 32 87 I16(ehdr->e_type); 88 I16(ehdr->e_machine); 89 I32(ehdr->e_version); 90 I32(ehdr->e_entry); 91 I32(ehdr->e_phoff); 92 I32(ehdr->e_shoff); 93 I32(ehdr->e_flags); 94 I16(ehdr->e_ehsize); 95 I16(ehdr->e_phentsize); 96 I16(ehdr->e_phnum); 97 I16(ehdr->e_shentsize); 98 I16(ehdr->e_shnum); 99 I16(ehdr->e_shstrndx); 100 #elif ELFSIZE == 64 101 I16(ehdr->e_type); 102 I16(ehdr->e_machine); 103 I32(ehdr->e_version); 104 I64(ehdr->e_entry); 105 I64(ehdr->e_phoff); 106 I64(ehdr->e_shoff); 107 I32(ehdr->e_flags); 108 I16(ehdr->e_ehsize); 109 I16(ehdr->e_phentsize); 110 I16(ehdr->e_phnum); 111 I16(ehdr->e_shentsize); 112 I16(ehdr->e_shnum); 113 I16(ehdr->e_shstrndx); 114 #else 115 #error ELFSIZE is not 32 or 64 116 #endif 117 } 118 119 static void 120 externalize_ehdr(Elf_Byte bo, Elf_Ehdr *ehdr) 121 { 122 123 #if ELFSIZE == 32 124 E16(ehdr->e_type); 125 E16(ehdr->e_machine); 126 E32(ehdr->e_version); 127 E32(ehdr->e_entry); 128 E32(ehdr->e_phoff); 129 E32(ehdr->e_shoff); 130 E32(ehdr->e_flags); 131 E16(ehdr->e_ehsize); 132 E16(ehdr->e_phentsize); 133 E16(ehdr->e_phnum); 134 E16(ehdr->e_shentsize); 135 E16(ehdr->e_shnum); 136 E16(ehdr->e_shstrndx); 137 #elif ELFSIZE == 64 138 E16(ehdr->e_type); 139 E16(ehdr->e_machine); 140 E32(ehdr->e_version); 141 E64(ehdr->e_entry); 142 E64(ehdr->e_phoff); 143 E64(ehdr->e_shoff); 144 E32(ehdr->e_flags); 145 E16(ehdr->e_ehsize); 146 E16(ehdr->e_phentsize); 147 E16(ehdr->e_phnum); 148 E16(ehdr->e_shentsize); 149 E16(ehdr->e_shnum); 150 E16(ehdr->e_shstrndx); 151 #else 152 #error ELFSIZE is not 32 or 64 153 #endif 154 } 155 156 static void 157 internalize_phdr(Elf_Byte bo, Elf_Phdr *phdr) 158 { 159 160 #if ELFSIZE == 32 161 I32(phdr->p_type); 162 I32(phdr->p_offset); 163 I32(phdr->p_vaddr); 164 I32(phdr->p_paddr); 165 I32(phdr->p_filesz); 166 I32(phdr->p_memsz); 167 I32(phdr->p_flags); 168 I32(phdr->p_align); 169 #elif ELFSIZE == 64 170 I32(phdr->p_type); 171 I32(phdr->p_offset); 172 I64(phdr->p_vaddr); 173 I64(phdr->p_paddr); 174 I64(phdr->p_filesz); 175 I64(phdr->p_memsz); 176 I64(phdr->p_flags); 177 I64(phdr->p_align); 178 #else 179 #error ELFSIZE is not 32 or 64 180 #endif 181 } 182 183 static void 184 internalize_shdr(Elf_Byte bo, Elf_Shdr *shdr) 185 { 186 187 #if ELFSIZE == 32 188 I32(shdr->sh_name); 189 I32(shdr->sh_type); 190 I32(shdr->sh_flags); 191 I32(shdr->sh_addr); 192 I32(shdr->sh_offset); 193 I32(shdr->sh_size); 194 I32(shdr->sh_link); 195 I32(shdr->sh_info); 196 I32(shdr->sh_addralign); 197 I32(shdr->sh_entsize); 198 #elif ELFSIZE == 64 199 I32(shdr->sh_name); 200 I32(shdr->sh_type); 201 I64(shdr->sh_flags); 202 I64(shdr->sh_addr); 203 I64(shdr->sh_offset); 204 I64(shdr->sh_size); 205 I32(shdr->sh_link); 206 I32(shdr->sh_info); 207 I64(shdr->sh_addralign); 208 I64(shdr->sh_entsize); 209 #else 210 #error ELFSIZE is not 32 or 64 211 #endif 212 } 213 214 static void 215 externalize_shdr(Elf_Byte bo, Elf_Shdr *shdr) 216 { 217 218 #if ELFSIZE == 32 219 E32(shdr->sh_name); 220 E32(shdr->sh_type); 221 E32(shdr->sh_flags); 222 E32(shdr->sh_addr); 223 E32(shdr->sh_offset); 224 E32(shdr->sh_size); 225 E32(shdr->sh_link); 226 E32(shdr->sh_info); 227 E32(shdr->sh_addralign); 228 E32(shdr->sh_entsize); 229 #elif ELFSIZE == 64 230 E32(shdr->sh_name); 231 E32(shdr->sh_type); 232 E64(shdr->sh_flags); 233 E64(shdr->sh_addr); 234 E64(shdr->sh_offset); 235 E64(shdr->sh_size); 236 E32(shdr->sh_link); 237 E32(shdr->sh_info); 238 E64(shdr->sh_addralign); 239 E64(shdr->sh_entsize); 240 #else 241 #error ELFSIZE is not 32 or 64 242 #endif 243 } 244 #else /* _STANDALONE */ 245 /* 246 * Byte swapping is never necessary in the _STANDALONE case because 247 * we are being built with the target compiler. 248 */ 249 #define internalize_ehdr(bo, ehdr) /* nothing */ 250 #define externalize_ehdr(bo, ehdr) /* nothing */ 251 252 #define internalize_phdr(bo, phdr) /* nothing */ 253 254 #define internalize_shdr(bo, shdr) /* nothing */ 255 #define externalize_shdr(bo, shdr) /* nothing */ 256 #endif /* _STANDALONE */ 257 258 #define IS_TEXT(p) (p.p_flags & PF_X) 259 #define IS_DATA(p) (p.p_flags & PF_W) 260 #define IS_BSS(p) (p.p_filesz < p.p_memsz) 261 262 int 263 ELFNAMEEND(loadfile)(int fd, Elf_Ehdr *elf, u_long *marks, int flags) 264 { 265 Elf_Shdr *shp; 266 Elf_Phdr *phdr; 267 int i, j; 268 ssize_t sz; 269 int first; 270 Elf_Addr shpp; 271 Elf_Addr minp = ~0, maxp = 0, pos = 0, elfp = 0; 272 u_long offset = marks[MARK_START]; 273 ssize_t nr; 274 struct __packed { 275 Elf_Nhdr nh; 276 uint8_t name[ELF_NOTE_NETBSD_NAMESZ + 1]; 277 uint8_t desc[ELF_NOTE_NETBSD_DESCSZ]; 278 } note; 279 char *shstr = NULL; 280 size_t shstrsz = 0; 281 int boot_load_ctf = 1; 282 283 /* some ports dont use the offset */ 284 (void)&offset; 285 286 /* have not seen a data segment so far */ 287 marks[MARK_DATA] = 0; 288 289 internalize_ehdr(elf->e_ident[EI_DATA], elf); 290 291 sz = elf->e_phnum * sizeof(Elf_Phdr); 292 phdr = ALLOC(sz); 293 294 if (lseek(fd, elf->e_phoff, SEEK_SET) == -1) { 295 WARN(("lseek phdr")); 296 goto freephdr; 297 } 298 nr = read(fd, phdr, sz); 299 if (nr == -1) { 300 WARN(("read program headers")); 301 goto freephdr; 302 } 303 if (nr != sz) { 304 errno = EIO; 305 WARN(("read program headers")); 306 goto freephdr; 307 } 308 309 for (first = 1, i = 0; i < elf->e_phnum; i++) { 310 internalize_phdr(elf->e_ident[EI_DATA], &phdr[i]); 311 312 #ifndef MD_LOADSEG /* Allow processor ABI specific segment loads */ 313 #define MD_LOADSEG(a) /*CONSTCOND*/0 314 #endif 315 if (MD_LOADSEG(&phdr[i])) 316 goto loadseg; 317 318 if (phdr[i].p_type != PT_LOAD || 319 (phdr[i].p_flags & (PF_W|PF_X)) == 0) 320 continue; 321 322 if ((IS_TEXT(phdr[i]) && (flags & LOAD_TEXT)) || 323 (IS_DATA(phdr[i]) && (flags & LOAD_DATA))) { 324 loadseg: 325 /* XXX: Assume first address is lowest */ 326 if (marks[MARK_DATA] == 0 && IS_DATA(phdr[i])) 327 marks[MARK_DATA] = LOADADDR(phdr[i].p_vaddr); 328 329 /* Read in segment. */ 330 PROGRESS(("%s%lu", first ? "" : "+", 331 (u_long)phdr[i].p_filesz)); 332 333 if (lseek(fd, phdr[i].p_offset, SEEK_SET) == -1) { 334 WARN(("lseek text")); 335 goto freephdr; 336 } 337 nr = READ(fd, phdr[i].p_vaddr, phdr[i].p_filesz); 338 if (nr == -1) { 339 WARN(("read text error")); 340 goto freephdr; 341 } 342 if (nr != (ssize_t)phdr[i].p_filesz) { 343 errno = EIO; 344 WARN(("read text")); 345 goto freephdr; 346 } 347 first = 0; 348 } 349 if ((IS_TEXT(phdr[i]) && (flags & (LOAD_TEXT|COUNT_TEXT))) || 350 (IS_DATA(phdr[i]) && (flags & (LOAD_DATA|COUNT_DATA)))) { 351 pos = phdr[i].p_vaddr; 352 if (minp > pos) 353 minp = pos; 354 pos += phdr[i].p_filesz; 355 if (maxp < pos) 356 maxp = pos; 357 } 358 359 /* Zero out bss. */ 360 if (IS_BSS(phdr[i]) && (flags & LOAD_BSS)) { 361 PROGRESS(("+%lu", 362 (u_long)(phdr[i].p_memsz - phdr[i].p_filesz))); 363 BZERO((phdr[i].p_vaddr + phdr[i].p_filesz), 364 phdr[i].p_memsz - phdr[i].p_filesz); 365 } 366 if (IS_BSS(phdr[i]) && (flags & (LOAD_BSS|COUNT_BSS))) { 367 pos += phdr[i].p_memsz - phdr[i].p_filesz; 368 if (maxp < pos) 369 maxp = pos; 370 } 371 } 372 DEALLOC(phdr, sz); 373 374 /* 375 * Copy the ELF and section headers. 376 */ 377 maxp = roundup(maxp, ELFROUND); 378 if (flags & (LOAD_HDR|COUNT_HDR)) { 379 elfp = maxp; 380 maxp += sizeof(Elf_Ehdr); 381 } 382 383 if (flags & (LOAD_SYM|COUNT_SYM)) { 384 if (lseek(fd, elf->e_shoff, SEEK_SET) == -1) { 385 WARN(("lseek section headers")); 386 return 1; 387 } 388 sz = elf->e_shnum * sizeof(Elf_Shdr); 389 390 shp = ALLOC(sz); 391 392 nr = read(fd, shp, sz); 393 if (nr == -1) { 394 WARN(("read section headers")); 395 goto freeshp; 396 } 397 if (nr != sz) { 398 errno = EIO; 399 WARN(("read section headers")); 400 goto freeshp; 401 } 402 403 shpp = maxp; 404 maxp += roundup(sz, ELFROUND); 405 406 #ifndef _STANDALONE 407 /* Internalize the section headers. */ 408 for (i = 0; i < elf->e_shnum; i++) 409 internalize_shdr(elf->e_ident[EI_DATA], &shp[i]); 410 #endif 411 412 /* 413 * First load the section names section. 414 */ 415 if (boot_load_ctf && (elf->e_shstrndx != 0)) { 416 if (flags & LOAD_SYM) { 417 if (lseek(fd, shp[elf->e_shstrndx].sh_offset, 418 SEEK_SET) == -1) { 419 WARN(("lseek symbols")); 420 goto freeshp; 421 } 422 nr = READ(fd, maxp, 423 shp[elf->e_shstrndx].sh_size); 424 if (nr == -1) { 425 WARN(("read symbols")); 426 goto freeshp; 427 } 428 if (nr != 429 (ssize_t)shp[elf->e_shstrndx].sh_size) { 430 errno = EIO; 431 WARN(("read symbols")); 432 goto freeshp; 433 } 434 435 shstr = ALLOC(shp[elf->e_shstrndx].sh_size); 436 shstrsz = shp[elf->e_shstrndx].sh_size; 437 if (lseek(fd, shp[elf->e_shstrndx].sh_offset, 438 SEEK_SET) == -1) { 439 WARN(("lseek symbols")); 440 goto freeshp; 441 } 442 nr = read(fd, shstr, 443 shp[elf->e_shstrndx].sh_size); 444 if (nr == -1) { 445 WARN(("read symbols")); 446 goto freeshp; 447 } 448 } 449 shp[elf->e_shstrndx].sh_offset = maxp - elfp; 450 maxp += roundup(shp[elf->e_shstrndx].sh_size, ELFROUND); 451 } 452 453 /* 454 * Now load the symbol sections themselves. Make sure 455 * the sections are aligned. Don't bother with any 456 * string table that isn't referenced by a symbol 457 * table. 458 */ 459 for (first = 1, i = 0; i < elf->e_shnum; i++) { 460 if (i == elf->e_shstrndx) { 461 /* already loaded this section */ 462 continue; 463 } 464 switch (shp[i].sh_type) { 465 case SHT_PROGBITS: 466 if (boot_load_ctf && shstr) { 467 /* got a CTF section? */ 468 if (strncmp(".SUNW_ctf", 469 &shstr[shp[i].sh_name], 10) == 0) { 470 goto havesym; 471 } 472 } 473 474 /* Not loading this, so zero out the offset. */ 475 shp[i].sh_offset = 0; 476 break; 477 case SHT_STRTAB: 478 for (j = 0; j < elf->e_shnum; j++) 479 if (shp[j].sh_type == SHT_SYMTAB && 480 shp[j].sh_link == (unsigned int)i) 481 goto havesym; 482 /* FALLTHROUGH */ 483 default: 484 /* Not loading this, so zero out the offset. */ 485 shp[i].sh_offset = 0; 486 break; 487 havesym: 488 case SHT_SYMTAB: 489 if (flags & LOAD_SYM) { 490 PROGRESS(("%s%ld", first ? " [" : "+", 491 (u_long)shp[i].sh_size)); 492 if (lseek(fd, shp[i].sh_offset, 493 SEEK_SET) == -1) { 494 WARN(("lseek symbols")); 495 goto freeshp; 496 } 497 nr = READ(fd, maxp, shp[i].sh_size); 498 if (nr == -1) { 499 WARN(("read symbols")); 500 goto freeshp; 501 } 502 if (nr != (ssize_t)shp[i].sh_size) { 503 errno = EIO; 504 WARN(("read symbols")); 505 goto freeshp; 506 } 507 } 508 shp[i].sh_offset = maxp - elfp; 509 maxp += roundup(shp[i].sh_size, ELFROUND); 510 first = 0; 511 break; 512 case SHT_NOTE: 513 if ((flags & LOAD_NOTE) == 0) 514 break; 515 if (shp[i].sh_size < sizeof(note)) { 516 shp[i].sh_offset = 0; 517 break; 518 } 519 if (lseek(fd, shp[i].sh_offset, SEEK_SET) 520 == -1) { 521 WARN(("lseek note")); 522 goto freeshp; 523 } 524 nr = read(fd, ¬e, sizeof(note)); 525 if (nr == -1) { 526 WARN(("read note")); 527 goto freeshp; 528 } 529 if (note.nh.n_namesz == 530 ELF_NOTE_NETBSD_NAMESZ && 531 note.nh.n_descsz == 532 ELF_NOTE_NETBSD_DESCSZ && 533 note.nh.n_type == 534 ELF_NOTE_TYPE_NETBSD_TAG && 535 memcmp(note.name, ELF_NOTE_NETBSD_NAME, 536 sizeof(note.name)) == 0) { 537 memcpy(&netbsd_version, ¬e.desc, 538 sizeof(netbsd_version)); 539 } 540 shp[i].sh_offset = 0; 541 break; 542 } 543 } 544 if (flags & LOAD_SYM) { 545 #ifndef _STANDALONE 546 /* Externalize the section headers. */ 547 for (i = 0; i < elf->e_shnum; i++) 548 externalize_shdr(elf->e_ident[EI_DATA], 549 &shp[i]); 550 #endif 551 BCOPY(shp, shpp, sz); 552 553 if (first == 0) 554 PROGRESS(("]")); 555 } 556 DEALLOC(shp, sz); 557 } 558 559 if (shstr) { 560 DEALLOC(shstr, shstrsz); 561 } 562 563 /* 564 * Frob the copied ELF header to give information relative 565 * to elfp. 566 */ 567 if (flags & LOAD_HDR) { 568 elf->e_phoff = 0; 569 elf->e_shoff = sizeof(Elf_Ehdr); 570 elf->e_phentsize = 0; 571 elf->e_phnum = 0; 572 externalize_ehdr(elf->e_ident[EI_DATA], elf); 573 BCOPY(elf, elfp, sizeof(*elf)); 574 internalize_ehdr(elf->e_ident[EI_DATA], elf); 575 } 576 577 marks[MARK_START] = LOADADDR(minp); 578 marks[MARK_ENTRY] = LOADADDR(elf->e_entry); 579 /* 580 * Since there can be more than one symbol section in the code 581 * and we need to find strtab too in order to do anything 582 * useful with the symbols, we just pass the whole elf 583 * header back and we let the kernel debugger find the 584 * location and number of symbols by itself. 585 */ 586 marks[MARK_NSYM] = 1; /* XXX: Kernel needs >= 0 */ 587 marks[MARK_SYM] = LOADADDR(elfp); 588 marks[MARK_END] = LOADADDR(maxp); 589 return 0; 590 591 freephdr: 592 DEALLOC(phdr, sz); 593 return 1; 594 595 freeshp: 596 DEALLOC(shp, sz); 597 return 1; 598 } 599 600 #ifdef TEST 601 #include <stdlib.h> 602 #include <fcntl.h> 603 #include <err.h> 604 #include <stdio.h> 605 u_int32_t netbsd_version; 606 int 607 main(int argc, char *argv[]) 608 { 609 int fd; 610 u_long marks[MARK_MAX]; 611 Elf_Ehdr elf; 612 if (argc != 2) { 613 (void)fprintf(stderr, "Usage: %s <file>\n", getprogname()); 614 return 1; 615 } 616 if ((fd = open(argv[1], O_RDONLY)) == -1) 617 err(1, "Can't open `%s'", argv[1]); 618 if (read(fd, &elf, sizeof(elf)) != sizeof(elf)) 619 err(1, "Can't read `%s'", argv[1]); 620 memset(marks, 0, sizeof(marks)); 621 marks[MARK_START] = (u_long)malloc(2LL * 1024 * 2024 * 1024); 622 ELFNAMEEND(loadfile)(fd, &elf, marks, LOAD_ALL); 623 printf("%d\n", netbsd_version); 624 return 0; 625 } 626 #endif 627 628 #endif /* (ELFSIZE == 32 && BOOT_ELF32) || (ELFSIZE == 64 && BOOT_ELF64) */ 629