| 1 | /* |
| 2 | * ELF loading code |
| 3 | * |
| 4 | * Copyright (c) 2013 Stacey D. Son |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
| 20 | #include "qemu/osdep.h" |
| 21 | |
| 22 | #include "qemu.h" |
| 23 | #include "disas/disas.h" |
| 24 | #include "qemu/path.h" |
| 25 | #include "user/probe-guest-base.h" |
| 26 | |
| 27 | static abi_ulong target_auxents; /* Where the AUX entries are in target */ |
| 28 | static size_t target_auxents_sz; /* Size of AUX entries including AT_NULL */ |
| 29 | |
| 30 | #include "target_arch_reg.h" |
| 31 | #include "target_os_elf.h" |
| 32 | #include "target_os_stack.h" |
| 33 | #include "target_os_thread.h" |
| 34 | #include "target_os_user.h" |
| 35 | |
| 36 | abi_ulong target_stksiz; |
| 37 | abi_ulong target_stkbas; |
| 38 | |
| 39 | static int elf_core_dump(int signr, CPUArchState *env); |
| 40 | static int load_elf_sections(const struct elfhdr *hdr, struct elf_phdr *phdr, |
| 41 | int fd, abi_ulong rbase, abi_ulong *baddrp); |
| 42 | |
| 43 | static inline void memcpy_fromfs(void *to, const void *from, unsigned long n) |
| 44 | { |
| 45 | memcpy(to, from, n); |
| 46 | } |
| 47 | |
| 48 | #if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN |
| 49 | static void bswap_ehdr(struct elfhdr *ehdr) |
| 50 | { |
| 51 | bswap16s(&ehdr->e_type); /* Object file type */ |
| 52 | bswap16s(&ehdr->e_machine); /* Architecture */ |
| 53 | bswap32s(&ehdr->e_version); /* Object file version */ |
| 54 | bswaptls(&ehdr->e_entry); /* Entry point virtual address */ |
| 55 | bswaptls(&ehdr->e_phoff); /* Program header table file offset */ |
| 56 | bswaptls(&ehdr->e_shoff); /* Section header table file offset */ |
| 57 | bswap32s(&ehdr->e_flags); /* Processor-specific flags */ |
| 58 | bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */ |
| 59 | bswap16s(&ehdr->e_phentsize); /* Program header table entry size */ |
| 60 | bswap16s(&ehdr->e_phnum); /* Program header table entry count */ |
| 61 | bswap16s(&ehdr->e_shentsize); /* Section header table entry size */ |
| 62 | bswap16s(&ehdr->e_shnum); /* Section header table entry count */ |
| 63 | bswap16s(&ehdr->e_shstrndx); /* Section header string table index */ |
| 64 | } |
| 65 | |
| 66 | static void bswap_phdr(struct elf_phdr *phdr, int phnum) |
| 67 | { |
| 68 | int i; |
| 69 | |
| 70 | for (i = 0; i < phnum; i++, phdr++) { |
| 71 | bswap32s(&phdr->p_type); /* Segment type */ |
| 72 | bswap32s(&phdr->p_flags); /* Segment flags */ |
| 73 | bswaptls(&phdr->p_offset); /* Segment file offset */ |
| 74 | bswaptls(&phdr->p_vaddr); /* Segment virtual address */ |
| 75 | bswaptls(&phdr->p_paddr); /* Segment physical address */ |
| 76 | bswaptls(&phdr->p_filesz); /* Segment size in file */ |
| 77 | bswaptls(&phdr->p_memsz); /* Segment size in memory */ |
| 78 | bswaptls(&phdr->p_align); /* Segment alignment */ |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | static void bswap_shdr(struct elf_shdr *shdr, int shnum) |
| 83 | { |
| 84 | int i; |
| 85 | |
| 86 | for (i = 0; i < shnum; i++, shdr++) { |
| 87 | bswap32s(&shdr->sh_name); |
| 88 | bswap32s(&shdr->sh_type); |
| 89 | bswaptls(&shdr->sh_flags); |
| 90 | bswaptls(&shdr->sh_addr); |
| 91 | bswaptls(&shdr->sh_offset); |
| 92 | bswaptls(&shdr->sh_size); |
| 93 | bswap32s(&shdr->sh_link); |
| 94 | bswap32s(&shdr->sh_info); |
| 95 | bswaptls(&shdr->sh_addralign); |
| 96 | bswaptls(&shdr->sh_entsize); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | static void bswap_sym(struct elf_sym *sym) |
| 101 | { |
| 102 | bswap32s(&sym->st_name); |
| 103 | bswaptls(&sym->st_value); |
| 104 | bswaptls(&sym->st_size); |
| 105 | bswap16s(&sym->st_shndx); |
| 106 | } |
| 107 | |
| 108 | static void bswap_note(struct elf_note *en) |
| 109 | { |
| 110 | bswap32s(&en->n_namesz); |
| 111 | bswap32s(&en->n_descsz); |
| 112 | bswap32s(&en->n_type); |
| 113 | } |
| 114 | |
| 115 | #else |
| 116 | |
| 117 | static void bswap_ehdr(struct elfhdr *ehdr) { } |
| 118 | static void bswap_phdr(struct elf_phdr *phdr, int phnum) { } |
| 119 | static void bswap_shdr(struct elf_shdr *shdr, int shnum) { } |
| 120 | static void bswap_sym(struct elf_sym *sym) { } |
| 121 | static void bswap_note(struct elf_note *en) { } |
| 122 | |
| 123 | #endif /* HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN */ |
| 124 | |
| 125 | #include "elfcore.c" |
| 126 | |
| 127 | /* |
| 128 | * 'copy_elf_strings()' copies argument/envelope strings from user |
| 129 | * memory to free pages in kernel mem. These are in a format ready |
| 130 | * to be put directly into the top of new user memory. |
| 131 | * |
| 132 | */ |
| 133 | static abi_ulong copy_elf_strings(int argc, char **argv, void **page, |
| 134 | abi_ulong p) |
| 135 | { |
| 136 | char *tmp, *tmp1, *pag = NULL; |
| 137 | int len, offset = 0; |
| 138 | |
| 139 | if (!p) { |
| 140 | return 0; /* bullet-proofing */ |
| 141 | } |
| 142 | while (argc-- > 0) { |
| 143 | tmp = argv[argc]; |
| 144 | if (!tmp) { |
| 145 | fprintf(stderr, "VFS: argc is wrong"); |
| 146 | exit(-1); |
| 147 | } |
| 148 | tmp1 = tmp; |
| 149 | while (*tmp++) { |
| 150 | continue; |
| 151 | } |
| 152 | len = tmp - tmp1; |
| 153 | if (p < len) { /* this shouldn't happen - 128kB */ |
| 154 | return 0; |
| 155 | } |
| 156 | while (len) { |
| 157 | --p; --tmp; --len; |
| 158 | if (--offset < 0) { |
| 159 | offset = p % TARGET_PAGE_SIZE; |
| 160 | pag = page[p / TARGET_PAGE_SIZE]; |
| 161 | if (!pag) { |
| 162 | pag = g_try_malloc0(TARGET_PAGE_SIZE); |
| 163 | page[p / TARGET_PAGE_SIZE] = pag; |
| 164 | if (!pag) { |
| 165 | return 0; |
| 166 | } |
| 167 | } |
| 168 | } |
| 169 | if (len == 0 || offset == 0) { |
| 170 | *(pag + offset) = *tmp; |
| 171 | } else { |
| 172 | int bytes_to_copy = (len > offset) ? offset : len; |
| 173 | tmp -= bytes_to_copy; |
| 174 | p -= bytes_to_copy; |
| 175 | offset -= bytes_to_copy; |
| 176 | len -= bytes_to_copy; |
| 177 | memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1); |
| 178 | } |
| 179 | } |
| 180 | } |
| 181 | return p; |
| 182 | } |
| 183 | |
| 184 | static void setup_arg_pages(struct bsd_binprm *bprm, struct image_info *info, |
| 185 | abi_ulong *stackp, abi_ulong *stringp) |
| 186 | { |
| 187 | abi_ulong stack_base, size; |
| 188 | abi_long addr; |
| 189 | |
| 190 | /* |
| 191 | * Create enough stack to hold everything. If we don't use it for args, |
| 192 | * we'll use it for something else... |
| 193 | */ |
| 194 | size = target_dflssiz; |
| 195 | stack_base = TARGET_USRSTACK - size; |
| 196 | addr = target_mmap(stack_base , size + qemu_host_page_size, |
| 197 | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); |
| 198 | if (addr == -1) { |
| 199 | perror("stk mmap"); |
| 200 | exit(-1); |
| 201 | } |
| 202 | /* we reserve one extra page at the top of the stack as guard */ |
| 203 | target_mprotect(addr + size, qemu_host_page_size, PROT_NONE); |
| 204 | |
| 205 | target_stksiz = size; |
| 206 | target_stkbas = addr; |
| 207 | |
| 208 | if (setup_initial_stack(bprm, stackp, stringp) != 0) { |
| 209 | perror("stk setup"); |
| 210 | exit(-1); |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | static void set_brk(abi_ulong start, abi_ulong end) |
| 215 | { |
| 216 | /* page-align the start and end addresses... */ |
| 217 | start = HOST_PAGE_ALIGN(start); |
| 218 | end = HOST_PAGE_ALIGN(end); |
| 219 | if (end <= start) { |
| 220 | return; |
| 221 | } |
| 222 | if (target_mmap(start, end - start, PROT_READ | PROT_WRITE | PROT_EXEC, |
| 223 | MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0) == -1) { |
| 224 | perror("cannot mmap brk"); |
| 225 | exit(-1); |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | |
| 230 | /* |
| 231 | * We need to explicitly zero any fractional pages after the data |
| 232 | * section (i.e. bss). This would contain the junk from the file that |
| 233 | * should not be in memory. |
| 234 | */ |
| 235 | static void padzero(abi_ulong elf_bss, abi_ulong last_bss) |
| 236 | { |
| 237 | abi_ulong nbyte; |
| 238 | |
| 239 | if (elf_bss >= last_bss) { |
| 240 | return; |
| 241 | } |
| 242 | |
| 243 | /* |
| 244 | * XXX: this is really a hack : if the real host page size is |
| 245 | * smaller than the target page size, some pages after the end |
| 246 | * of the file may not be mapped. A better fix would be to |
| 247 | * patch target_mmap(), but it is more complicated as the file |
| 248 | * size must be known. |
| 249 | */ |
| 250 | if (qemu_real_host_page_size() < qemu_host_page_size) { |
| 251 | abi_ulong end_addr, end_addr1; |
| 252 | end_addr1 = REAL_HOST_PAGE_ALIGN(elf_bss); |
| 253 | end_addr = HOST_PAGE_ALIGN(elf_bss); |
| 254 | if (end_addr1 < end_addr) { |
| 255 | mmap((void *)g2h_untagged(end_addr1), end_addr - end_addr1, |
| 256 | PROT_READ | PROT_WRITE | PROT_EXEC, |
| 257 | MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0); |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | nbyte = elf_bss & (qemu_host_page_size - 1); |
| 262 | if (nbyte) { |
| 263 | nbyte = qemu_host_page_size - nbyte; |
| 264 | do { |
| 265 | /* FIXME - what to do if put_user() fails? */ |
| 266 | put_user_u8(0, elf_bss); |
| 267 | elf_bss++; |
| 268 | } while (--nbyte); |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | static abi_ulong load_elf_interp(struct elfhdr *interp_elf_ex, |
| 273 | int interpreter_fd, |
| 274 | abi_ulong *interp_load_addr) |
| 275 | { |
| 276 | struct elf_phdr *elf_phdata = NULL; |
| 277 | abi_ulong rbase; |
| 278 | int retval; |
| 279 | abi_ulong baddr, error; |
| 280 | |
| 281 | error = 0; |
| 282 | |
| 283 | bswap_ehdr(interp_elf_ex); |
| 284 | /* First of all, some simple consistency checks */ |
| 285 | if ((interp_elf_ex->e_type != ET_EXEC && interp_elf_ex->e_type != ET_DYN) || |
| 286 | !elf_check_arch(interp_elf_ex->e_machine)) { |
| 287 | return ~((abi_ulong)0UL); |
| 288 | } |
| 289 | |
| 290 | |
| 291 | /* Now read in all of the header information */ |
| 292 | if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > TARGET_PAGE_SIZE) { |
| 293 | return ~(abi_ulong)0UL; |
| 294 | } |
| 295 | |
| 296 | elf_phdata = (struct elf_phdr *) malloc(sizeof(struct elf_phdr) * |
| 297 | interp_elf_ex->e_phnum); |
| 298 | |
| 299 | if (!elf_phdata) { |
| 300 | return ~((abi_ulong)0UL); |
| 301 | } |
| 302 | |
| 303 | /* |
| 304 | * If the size of this structure has changed, then punt, since |
| 305 | * we will be doing the wrong thing. |
| 306 | */ |
| 307 | if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) { |
| 308 | free(elf_phdata); |
| 309 | return ~((abi_ulong)0UL); |
| 310 | } |
| 311 | |
| 312 | retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET); |
| 313 | if (retval >= 0) { |
| 314 | retval = read(interpreter_fd, (char *) elf_phdata, |
| 315 | sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); |
| 316 | } |
| 317 | if (retval < 0) { |
| 318 | perror("load_elf_interp"); |
| 319 | exit(-1); |
| 320 | free(elf_phdata); |
| 321 | return retval; |
| 322 | } |
| 323 | bswap_phdr(elf_phdata, interp_elf_ex->e_phnum); |
| 324 | |
| 325 | rbase = 0; |
| 326 | if (interp_elf_ex->e_type == ET_DYN) { |
| 327 | /* |
| 328 | * In order to avoid hardcoding the interpreter load |
| 329 | * address in qemu, we allocate a big enough memory zone. |
| 330 | */ |
| 331 | rbase = target_mmap(0, INTERP_MAP_SIZE, PROT_NONE, |
| 332 | MAP_PRIVATE | MAP_ANON, -1, 0); |
| 333 | if (rbase == -1) { |
| 334 | perror("mmap"); |
| 335 | exit(-1); |
| 336 | } |
| 337 | } |
| 338 | |
| 339 | error = load_elf_sections(interp_elf_ex, elf_phdata, interpreter_fd, rbase, |
| 340 | &baddr); |
| 341 | if (error != 0) { |
| 342 | perror("load_elf_sections"); |
| 343 | exit(-1); |
| 344 | } |
| 345 | |
| 346 | /* Now use mmap to map the library into memory. */ |
| 347 | close(interpreter_fd); |
| 348 | free(elf_phdata); |
| 349 | |
| 350 | *interp_load_addr = baddr; |
| 351 | return ((abi_ulong) interp_elf_ex->e_entry) + rbase; |
| 352 | } |
| 353 | |
| 354 | static int symfind(const void *s0, const void *s1) |
| 355 | { |
| 356 | struct elf_sym *sym = (struct elf_sym *)s1; |
| 357 | __typeof(sym->st_value) addr = *(uint64_t *)s0; |
| 358 | int result = 0; |
| 359 | |
| 360 | if (addr < sym->st_value) { |
| 361 | result = -1; |
| 362 | } else if (addr >= sym->st_value + sym->st_size) { |
| 363 | result = 1; |
| 364 | } |
| 365 | return result; |
| 366 | } |
| 367 | |
| 368 | static const char *lookup_symbolxx(struct syminfo *s, uint64_t orig_addr) |
| 369 | { |
| 370 | #if ELF_CLASS == ELFCLASS32 |
| 371 | struct elf_sym *syms = s->disas_symtab.elf32; |
| 372 | #else |
| 373 | struct elf_sym *syms = s->disas_symtab.elf64; |
| 374 | #endif |
| 375 | |
| 376 | /* binary search */ |
| 377 | struct elf_sym *sym; |
| 378 | |
| 379 | sym = bsearch(&orig_addr, syms, s->disas_num_syms, sizeof(*syms), symfind); |
| 380 | if (sym != NULL) { |
| 381 | return s->disas_strtab + sym->st_name; |
| 382 | } |
| 383 | |
| 384 | return ""; |
| 385 | } |
| 386 | |
| 387 | /* FIXME: This should use elf_ops.h.inc */ |
| 388 | static int symcmp(const void *s0, const void *s1) |
| 389 | { |
| 390 | struct elf_sym *sym0 = (struct elf_sym *)s0; |
| 391 | struct elf_sym *sym1 = (struct elf_sym *)s1; |
| 392 | return (sym0->st_value < sym1->st_value) ? -1 : |
| 393 | ((sym0->st_value > sym1->st_value) ? 1 : 0); |
| 394 | } |
| 395 | |
| 396 | /* Best attempt to load symbols from this ELF object. */ |
| 397 | static void load_symbols(struct elfhdr *hdr, int fd) |
| 398 | { |
| 399 | unsigned int i, nsyms; |
| 400 | struct elf_shdr sechdr, symtab, strtab; |
| 401 | char *strings; |
| 402 | struct syminfo *s; |
| 403 | struct elf_sym *syms, *new_syms; |
| 404 | |
| 405 | lseek(fd, hdr->e_shoff, SEEK_SET); |
| 406 | for (i = 0; i < hdr->e_shnum; i++) { |
| 407 | if (read(fd, &sechdr, sizeof(sechdr)) != sizeof(sechdr)) { |
| 408 | return; |
| 409 | } |
| 410 | bswap_shdr(&sechdr, 1); |
| 411 | if (sechdr.sh_type == SHT_SYMTAB) { |
| 412 | symtab = sechdr; |
| 413 | lseek(fd, hdr->e_shoff + sizeof(sechdr) * sechdr.sh_link, |
| 414 | SEEK_SET); |
| 415 | if (read(fd, &strtab, sizeof(strtab)) != sizeof(strtab)) { |
| 416 | return; |
| 417 | } |
| 418 | bswap_shdr(&strtab, 1); |
| 419 | goto found; |
| 420 | } |
| 421 | } |
| 422 | return; /* Shouldn't happen... */ |
| 423 | |
| 424 | found: |
| 425 | /* Now know where the strtab and symtab are. Snarf them. */ |
| 426 | s = malloc(sizeof(*s)); |
| 427 | syms = malloc(symtab.sh_size); |
| 428 | if (!syms) { |
| 429 | free(s); |
| 430 | return; |
| 431 | } |
| 432 | s->disas_strtab = strings = malloc(strtab.sh_size); |
| 433 | if (!s->disas_strtab) { |
| 434 | free(s); |
| 435 | free(syms); |
| 436 | return; |
| 437 | } |
| 438 | |
| 439 | lseek(fd, symtab.sh_offset, SEEK_SET); |
| 440 | if (read(fd, syms, symtab.sh_size) != symtab.sh_size) { |
| 441 | free(s); |
| 442 | free(syms); |
| 443 | free(strings); |
| 444 | return; |
| 445 | } |
| 446 | |
| 447 | nsyms = symtab.sh_size / sizeof(struct elf_sym); |
| 448 | |
| 449 | i = 0; |
| 450 | while (i < nsyms) { |
| 451 | bswap_sym(syms + i); |
| 452 | /* Throw away entries which we do not need. */ |
| 453 | if (syms[i].st_shndx == SHN_UNDEF || |
| 454 | syms[i].st_shndx >= SHN_LORESERVE || |
| 455 | ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) { |
| 456 | nsyms--; |
| 457 | if (i < nsyms) { |
| 458 | syms[i] = syms[nsyms]; |
| 459 | } |
| 460 | continue; |
| 461 | } |
| 462 | #if defined(TARGET_ARM) || defined(TARGET_MIPS) |
| 463 | /* The bottom address bit marks a Thumb or MIPS16 symbol. */ |
| 464 | syms[i].st_value &= ~(target_ulong)1; |
| 465 | #endif |
| 466 | i++; |
| 467 | } |
| 468 | |
| 469 | /* |
| 470 | * Attempt to free the storage associated with the local symbols |
| 471 | * that we threw away. Whether or not this has any effect on the |
| 472 | * memory allocation depends on the malloc implementation and how |
| 473 | * many symbols we managed to discard. |
| 474 | */ |
| 475 | new_syms = realloc(syms, nsyms * sizeof(*syms)); |
| 476 | if (new_syms == NULL) { |
| 477 | free(s); |
| 478 | free(syms); |
| 479 | free(strings); |
| 480 | return; |
| 481 | } |
| 482 | syms = new_syms; |
| 483 | |
| 484 | qsort(syms, nsyms, sizeof(*syms), symcmp); |
| 485 | |
| 486 | lseek(fd, strtab.sh_offset, SEEK_SET); |
| 487 | if (read(fd, strings, strtab.sh_size) != strtab.sh_size) { |
| 488 | free(s); |
| 489 | free(syms); |
| 490 | free(strings); |
| 491 | return; |
| 492 | } |
| 493 | s->disas_num_syms = nsyms; |
| 494 | #if ELF_CLASS == ELFCLASS32 |
| 495 | s->disas_symtab.elf32 = syms; |
| 496 | s->lookup_symbol = (lookup_symbol_t)lookup_symbolxx; |
| 497 | #else |
| 498 | s->disas_symtab.elf64 = syms; |
| 499 | s->lookup_symbol = (lookup_symbol_t)lookup_symbolxx; |
| 500 | #endif |
| 501 | s->next = syminfos; |
| 502 | syminfos = s; |
| 503 | } |
| 504 | |
| 505 | /* Check the elf header and see if this a target elf binary. */ |
| 506 | int is_target_elf_binary(int fd) |
| 507 | { |
| 508 | uint8_t buf[128]; |
| 509 | struct elfhdr elf_ex; |
| 510 | |
| 511 | if (lseek(fd, 0L, SEEK_SET) < 0) { |
| 512 | return 0; |
| 513 | } |
| 514 | if (read(fd, buf, sizeof(buf)) < 0) { |
| 515 | return 0; |
| 516 | } |
| 517 | |
| 518 | elf_ex = *((struct elfhdr *)buf); |
| 519 | bswap_ehdr(&elf_ex); |
| 520 | |
| 521 | if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) || |
| 522 | (!elf_check_arch(elf_ex.e_machine))) { |
| 523 | return 0; |
| 524 | } else { |
| 525 | return 1; |
| 526 | } |
| 527 | } |
| 528 | |
| 529 | static int |
| 530 | load_elf_sections(const struct elfhdr *hdr, struct elf_phdr *phdr, int fd, |
| 531 | abi_ulong rbase, abi_ulong *baddrp) |
| 532 | { |
| 533 | struct elf_phdr *elf_ppnt; |
| 534 | abi_ulong baddr; |
| 535 | int i; |
| 536 | bool first; |
| 537 | |
| 538 | /* |
| 539 | * Now we do a little grungy work by mmaping the ELF image into |
| 540 | * the correct location in memory. At this point, we assume that |
| 541 | * the image should be loaded at fixed address, not at a variable |
| 542 | * address. |
| 543 | */ |
| 544 | first = true; |
| 545 | for (i = 0, elf_ppnt = phdr; i < hdr->e_phnum; i++, elf_ppnt++) { |
| 546 | int elf_prot = 0; |
| 547 | abi_ulong error; |
| 548 | |
| 549 | /* XXX Skip memsz == 0. */ |
| 550 | if (elf_ppnt->p_type != PT_LOAD) { |
| 551 | continue; |
| 552 | } |
| 553 | |
| 554 | if (elf_ppnt->p_flags & PF_R) { |
| 555 | elf_prot |= PROT_READ; |
| 556 | } |
| 557 | if (elf_ppnt->p_flags & PF_W) { |
| 558 | elf_prot |= PROT_WRITE; |
| 559 | } |
| 560 | if (elf_ppnt->p_flags & PF_X) { |
| 561 | elf_prot |= PROT_EXEC; |
| 562 | } |
| 563 | |
| 564 | error = target_mmap(TARGET_ELF_PAGESTART(rbase + elf_ppnt->p_vaddr), |
| 565 | (elf_ppnt->p_filesz + |
| 566 | TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)), |
| 567 | elf_prot, |
| 568 | (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE), |
| 569 | fd, |
| 570 | (elf_ppnt->p_offset - |
| 571 | TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr))); |
| 572 | if (error == -1) { |
| 573 | perror("mmap"); |
| 574 | exit(-1); |
| 575 | } else if (elf_ppnt->p_memsz != elf_ppnt->p_filesz) { |
| 576 | abi_ulong start_bss, end_bss; |
| 577 | |
| 578 | start_bss = rbase + elf_ppnt->p_vaddr + elf_ppnt->p_filesz; |
| 579 | end_bss = rbase + elf_ppnt->p_vaddr + elf_ppnt->p_memsz; |
| 580 | |
| 581 | /* |
| 582 | * Calling set_brk effectively mmaps the pages that we need for the |
| 583 | * bss and break sections. |
| 584 | */ |
| 585 | set_brk(start_bss, end_bss); |
| 586 | padzero(start_bss, end_bss); |
| 587 | } |
| 588 | |
| 589 | if (first) { |
| 590 | baddr = TARGET_ELF_PAGESTART(rbase + elf_ppnt->p_vaddr); |
| 591 | first = false; |
| 592 | } |
| 593 | } |
| 594 | |
| 595 | if (baddrp != NULL) { |
| 596 | *baddrp = baddr; |
| 597 | } |
| 598 | return 0; |
| 599 | } |
| 600 | |
| 601 | int load_elf_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs, |
| 602 | struct image_info *info) |
| 603 | { |
| 604 | struct elfhdr elf_ex; |
| 605 | struct elfhdr interp_elf_ex; |
| 606 | int interpreter_fd = -1; /* avoid warning */ |
| 607 | abi_ulong load_addr; |
| 608 | int i; |
| 609 | struct elf_phdr *elf_ppnt; |
| 610 | struct elf_phdr *elf_phdata; |
| 611 | abi_ulong elf_brk; |
| 612 | int error, retval; |
| 613 | char *elf_interpreter; |
| 614 | abi_ulong elf_entry, et_dyn_addr, interp_load_addr = 0; |
| 615 | abi_ulong reloc_func_desc = 0; |
| 616 | PGBRange range = { -1, 0 }; |
| 617 | |
| 618 | load_addr = 0; |
| 619 | elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */ |
| 620 | bswap_ehdr(&elf_ex); |
| 621 | |
| 622 | /* First of all, some simple consistency checks */ |
| 623 | if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) || |
| 624 | (!elf_check_arch(elf_ex.e_machine))) { |
| 625 | return -ENOEXEC; |
| 626 | } |
| 627 | |
| 628 | bprm->p = copy_elf_strings(1, &bprm->filename, bprm->page, bprm->p); |
| 629 | bprm->p = copy_elf_strings(bprm->envc, bprm->envp, bprm->page, bprm->p); |
| 630 | bprm->p = copy_elf_strings(bprm->argc, bprm->argv, bprm->page, bprm->p); |
| 631 | if (!bprm->p) { |
| 632 | retval = -E2BIG; |
| 633 | } |
| 634 | |
| 635 | /* Now read in all of the header information */ |
| 636 | elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize * elf_ex.e_phnum); |
| 637 | if (elf_phdata == NULL) { |
| 638 | return -ENOMEM; |
| 639 | } |
| 640 | |
| 641 | retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET); |
| 642 | if (retval > 0) { |
| 643 | retval = read(bprm->fd, (char *)elf_phdata, |
| 644 | elf_ex.e_phentsize * elf_ex.e_phnum); |
| 645 | } |
| 646 | |
| 647 | if (retval < 0) { |
| 648 | perror("load_elf_binary"); |
| 649 | exit(-1); |
| 650 | free(elf_phdata); |
| 651 | return -errno; |
| 652 | } |
| 653 | |
| 654 | bswap_phdr(elf_phdata, elf_ex.e_phnum); |
| 655 | elf_ppnt = elf_phdata; |
| 656 | |
| 657 | elf_brk = 0; |
| 658 | |
| 659 | elf_interpreter = NULL; |
| 660 | for (i = 0; i < elf_ex.e_phnum; i++, elf_ppnt++) { |
| 661 | switch (elf_ppnt->p_type) { |
| 662 | case PT_INTERP: |
| 663 | if (elf_interpreter != NULL) { |
| 664 | free(elf_phdata); |
| 665 | free(elf_interpreter); |
| 666 | close(bprm->fd); |
| 667 | return -EINVAL; |
| 668 | } |
| 669 | |
| 670 | elf_interpreter = (char *)malloc(elf_ppnt->p_filesz); |
| 671 | if (elf_interpreter == NULL) { |
| 672 | free(elf_phdata); |
| 673 | close(bprm->fd); |
| 674 | return -ENOMEM; |
| 675 | } |
| 676 | |
| 677 | retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET); |
| 678 | if (retval >= 0) { |
| 679 | retval = read(bprm->fd, elf_interpreter, elf_ppnt->p_filesz); |
| 680 | } |
| 681 | if (retval < 0) { |
| 682 | perror("load_elf_binary2"); |
| 683 | exit(-1); |
| 684 | } |
| 685 | |
| 686 | if (retval >= 0) { |
| 687 | retval = open(path(elf_interpreter), O_RDONLY); |
| 688 | if (retval >= 0) { |
| 689 | interpreter_fd = retval; |
| 690 | } else { |
| 691 | perror(elf_interpreter); |
| 692 | exit(-1); |
| 693 | /* retval = -errno; */ |
| 694 | } |
| 695 | } |
| 696 | |
| 697 | if (retval >= 0) { |
| 698 | retval = lseek(interpreter_fd, 0, SEEK_SET); |
| 699 | if (retval >= 0) { |
| 700 | retval = read(interpreter_fd, bprm->buf, 128); |
| 701 | } |
| 702 | } |
| 703 | if (retval >= 0) { |
| 704 | interp_elf_ex = *((struct elfhdr *) bprm->buf); |
| 705 | } |
| 706 | if (retval < 0) { |
| 707 | perror("load_elf_binary3"); |
| 708 | exit(-1); |
| 709 | free(elf_phdata); |
| 710 | free(elf_interpreter); |
| 711 | close(bprm->fd); |
| 712 | return retval; |
| 713 | } |
| 714 | break; |
| 715 | |
| 716 | case PT_LOAD: |
| 717 | range.lo = MIN(range.lo, elf_ppnt->p_vaddr); |
| 718 | range.hi = MAX(range.hi, |
| 719 | elf_ppnt->p_vaddr + elf_ppnt->p_memsz - 1); |
| 720 | break; |
| 721 | } |
| 722 | } |
| 723 | |
| 724 | /* Some simple consistency checks for the interpreter */ |
| 725 | if (elf_interpreter) { |
| 726 | if (interp_elf_ex.e_ident[0] != 0x7f || |
| 727 | strncmp((char *)&interp_elf_ex.e_ident[1], "ELF", 3) != 0) { |
| 728 | free(elf_interpreter); |
| 729 | free(elf_phdata); |
| 730 | close(bprm->fd); |
| 731 | return -ELIBBAD; |
| 732 | } |
| 733 | } |
| 734 | |
| 735 | /* |
| 736 | * OK, we are done with that, now set up the arg stuff, and then start this |
| 737 | * sucker up |
| 738 | */ |
| 739 | if (!bprm->p) { |
| 740 | free(elf_interpreter); |
| 741 | free(elf_phdata); |
| 742 | close(bprm->fd); |
| 743 | return -E2BIG; |
| 744 | } |
| 745 | |
| 746 | /* OK, This is the point of no return */ |
| 747 | info->end_data = 0; |
| 748 | info->end_code = 0; |
| 749 | elf_entry = (abi_ulong) elf_ex.e_entry; |
| 750 | |
| 751 | et_dyn_addr = 0; |
| 752 | if (elf_ex.e_type == ET_DYN) { |
| 753 | probe_guest_base(bprm->filename, NULL, NULL); |
| 754 | et_dyn_addr = ELF_ET_DYN_LOAD_ADDR - range.lo; |
| 755 | } else { |
| 756 | probe_guest_base(bprm->filename, &range, NULL); |
| 757 | } |
| 758 | |
| 759 | /* |
| 760 | * Do this so that we can load the interpreter, if need be. We will |
| 761 | * change some of these later |
| 762 | */ |
| 763 | info->rss = 0; |
| 764 | setup_arg_pages(bprm, info, &bprm->p, &bprm->stringp); |
| 765 | info->start_stack = bprm->p; |
| 766 | |
| 767 | info->elf_flags = elf_ex.e_flags; |
| 768 | |
| 769 | error = load_elf_sections(&elf_ex, elf_phdata, bprm->fd, et_dyn_addr, |
| 770 | &load_addr); |
| 771 | for (i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) { |
| 772 | if (elf_ppnt->p_type != PT_LOAD) { |
| 773 | continue; |
| 774 | } |
| 775 | if (elf_ppnt->p_memsz > elf_ppnt->p_filesz) |
| 776 | elf_brk = MAX(elf_brk, et_dyn_addr + elf_ppnt->p_vaddr + |
| 777 | elf_ppnt->p_memsz); |
| 778 | } |
| 779 | if (error != 0) { |
| 780 | perror("load_elf_sections"); |
| 781 | exit(-1); |
| 782 | } |
| 783 | |
| 784 | if (elf_interpreter) { |
| 785 | elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd, |
| 786 | &interp_load_addr); |
| 787 | reloc_func_desc = interp_load_addr; |
| 788 | |
| 789 | close(interpreter_fd); |
| 790 | free(elf_interpreter); |
| 791 | |
| 792 | if (elf_entry == ~((abi_ulong)0UL)) { |
| 793 | printf("Unable to load interpreter\n"); |
| 794 | free(elf_phdata); |
| 795 | exit(-1); |
| 796 | return 0; |
| 797 | } |
| 798 | } else { |
| 799 | interp_load_addr = et_dyn_addr; |
| 800 | elf_entry += interp_load_addr; |
| 801 | } |
| 802 | |
| 803 | free(elf_phdata); |
| 804 | |
| 805 | if (qemu_log_enabled()) { |
| 806 | load_symbols(&elf_ex, bprm->fd); |
| 807 | } |
| 808 | |
| 809 | close(bprm->fd); |
| 810 | |
| 811 | bprm->p = target_create_elf_tables(bprm->p, bprm->argc, bprm->envc, |
| 812 | bprm->stringp, &elf_ex, load_addr, |
| 813 | et_dyn_addr, interp_load_addr, info); |
| 814 | info->load_addr = reloc_func_desc; |
| 815 | info->brk = elf_brk; |
| 816 | info->start_stack = bprm->p; |
| 817 | info->load_bias = 0; |
| 818 | |
| 819 | info->entry = elf_entry; |
| 820 | |
| 821 | #ifdef USE_ELF_CORE_DUMP |
| 822 | bprm->core_dump = &elf_core_dump; |
| 823 | #else |
| 824 | bprm->core_dump = NULL; |
| 825 | #endif |
| 826 | |
| 827 | return 0; |
| 828 | } |
| 829 | |
| 830 | void do_init_thread(struct target_pt_regs *regs, struct image_info *infop) |
| 831 | { |
| 832 | |
| 833 | target_thread_init(regs, infop); |
| 834 | } |