1 /* 2 * Copyright (c) 2011 The Chromium OS Authors. 3 * SPDX-License-Identifier: GPL-2.0+ 4 */ 5 6 #include <dirent.h> 7 #include <errno.h> 8 #include <fcntl.h> 9 #include <getopt.h> 10 #include <stdio.h> 11 #include <stdint.h> 12 #include <stdlib.h> 13 #include <string.h> 14 #include <termios.h> 15 #include <time.h> 16 #include <unistd.h> 17 #include <sys/mman.h> 18 #include <sys/stat.h> 19 #include <sys/time.h> 20 #include <sys/types.h> 21 #include <linux/types.h> 22 23 #include <asm/getopt.h> 24 #include <asm/sections.h> 25 #include <asm/state.h> 26 #include <os.h> 27 28 /* Operating System Interface */ 29 30 struct os_mem_hdr { 31 size_t length; /* number of bytes in the block */ 32 }; 33 34 ssize_t os_read(int fd, void *buf, size_t count) 35 { 36 return read(fd, buf, count); 37 } 38 39 ssize_t os_read_no_block(int fd, void *buf, size_t count) 40 { 41 const int flags = fcntl(fd, F_GETFL, 0); 42 43 fcntl(fd, F_SETFL, flags | O_NONBLOCK); 44 return os_read(fd, buf, count); 45 } 46 47 ssize_t os_write(int fd, const void *buf, size_t count) 48 { 49 return write(fd, buf, count); 50 } 51 52 off_t os_lseek(int fd, off_t offset, int whence) 53 { 54 if (whence == OS_SEEK_SET) 55 whence = SEEK_SET; 56 else if (whence == OS_SEEK_CUR) 57 whence = SEEK_CUR; 58 else if (whence == OS_SEEK_END) 59 whence = SEEK_END; 60 else 61 os_exit(1); 62 return lseek(fd, offset, whence); 63 } 64 65 int os_open(const char *pathname, int os_flags) 66 { 67 int flags; 68 69 switch (os_flags & OS_O_MASK) { 70 case OS_O_RDONLY: 71 default: 72 flags = O_RDONLY; 73 break; 74 75 case OS_O_WRONLY: 76 flags = O_WRONLY; 77 break; 78 79 case OS_O_RDWR: 80 flags = O_RDWR; 81 break; 82 } 83 84 if (os_flags & OS_O_CREAT) 85 flags |= O_CREAT; 86 87 return open(pathname, flags, 0777); 88 } 89 90 int os_close(int fd) 91 { 92 return close(fd); 93 } 94 95 int os_unlink(const char *pathname) 96 { 97 return unlink(pathname); 98 } 99 100 void os_exit(int exit_code) 101 { 102 exit(exit_code); 103 } 104 105 /* Restore tty state when we exit */ 106 static struct termios orig_term; 107 static bool term_setup; 108 109 static void os_fd_restore(void) 110 { 111 if (term_setup) 112 tcsetattr(0, TCSANOW, &orig_term); 113 } 114 115 /* Put tty into raw mode so <tab> and <ctrl+c> work */ 116 void os_tty_raw(int fd, bool allow_sigs) 117 { 118 struct termios term; 119 120 if (term_setup) 121 return; 122 term_setup = true; 123 124 /* If not a tty, don't complain */ 125 if (tcgetattr(fd, &orig_term)) 126 return; 127 128 term = orig_term; 129 term.c_iflag = IGNBRK | IGNPAR; 130 term.c_oflag = OPOST | ONLCR; 131 term.c_cflag = CS8 | CREAD | CLOCAL; 132 term.c_lflag = allow_sigs ? ISIG : 0; 133 if (tcsetattr(fd, TCSANOW, &term)) 134 return; 135 136 atexit(os_fd_restore); 137 } 138 139 void *os_malloc(size_t length) 140 { 141 struct os_mem_hdr *hdr; 142 143 hdr = mmap(NULL, length + sizeof(*hdr), PROT_READ | PROT_WRITE, 144 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 145 if (hdr == MAP_FAILED) 146 return NULL; 147 hdr->length = length; 148 149 return hdr + 1; 150 } 151 152 void os_free(void *ptr) 153 { 154 struct os_mem_hdr *hdr = ptr; 155 156 hdr--; 157 if (ptr) 158 munmap(hdr, hdr->length + sizeof(*hdr)); 159 } 160 161 void *os_realloc(void *ptr, size_t length) 162 { 163 struct os_mem_hdr *hdr = ptr; 164 void *buf = NULL; 165 166 hdr--; 167 if (length != 0) { 168 buf = os_malloc(length); 169 if (!buf) 170 return buf; 171 if (ptr) { 172 if (length > hdr->length) 173 length = hdr->length; 174 memcpy(buf, ptr, length); 175 } 176 } 177 os_free(ptr); 178 179 return buf; 180 } 181 182 void os_usleep(unsigned long usec) 183 { 184 usleep(usec); 185 } 186 187 uint64_t __attribute__((no_instrument_function)) os_get_nsec(void) 188 { 189 #if defined(CLOCK_MONOTONIC) && defined(_POSIX_MONOTONIC_CLOCK) 190 struct timespec tp; 191 if (EINVAL == clock_gettime(CLOCK_MONOTONIC, &tp)) { 192 struct timeval tv; 193 194 gettimeofday(&tv, NULL); 195 tp.tv_sec = tv.tv_sec; 196 tp.tv_nsec = tv.tv_usec * 1000; 197 } 198 return tp.tv_sec * 1000000000ULL + tp.tv_nsec; 199 #else 200 struct timeval tv; 201 gettimeofday(&tv, NULL); 202 return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000; 203 #endif 204 } 205 206 static char *short_opts; 207 static struct option *long_opts; 208 209 int os_parse_args(struct sandbox_state *state, int argc, char *argv[]) 210 { 211 struct sandbox_cmdline_option **sb_opt = __u_boot_sandbox_option_start; 212 size_t num_options = __u_boot_sandbox_option_count(); 213 size_t i; 214 215 int hidden_short_opt; 216 size_t si; 217 218 int c; 219 220 if (short_opts || long_opts) 221 return 1; 222 223 state->argc = argc; 224 state->argv = argv; 225 226 /* dynamically construct the arguments to the system getopt_long */ 227 short_opts = os_malloc(sizeof(*short_opts) * num_options * 2 + 1); 228 long_opts = os_malloc(sizeof(*long_opts) * num_options); 229 if (!short_opts || !long_opts) 230 return 1; 231 232 /* 233 * getopt_long requires "val" to be unique (since that is what the 234 * func returns), so generate unique values automatically for flags 235 * that don't have a short option. pick 0x100 as that is above the 236 * single byte range (where ASCII/ISO-XXXX-X charsets live). 237 */ 238 hidden_short_opt = 0x100; 239 si = 0; 240 for (i = 0; i < num_options; ++i) { 241 long_opts[i].name = sb_opt[i]->flag; 242 long_opts[i].has_arg = sb_opt[i]->has_arg ? 243 required_argument : no_argument; 244 long_opts[i].flag = NULL; 245 246 if (sb_opt[i]->flag_short) { 247 short_opts[si++] = long_opts[i].val = sb_opt[i]->flag_short; 248 if (long_opts[i].has_arg == required_argument) 249 short_opts[si++] = ':'; 250 } else 251 long_opts[i].val = sb_opt[i]->flag_short = hidden_short_opt++; 252 } 253 short_opts[si] = '\0'; 254 255 /* we need to handle output ourselves since u-boot provides printf */ 256 opterr = 0; 257 258 /* 259 * walk all of the options the user gave us on the command line, 260 * figure out what u-boot option structure they belong to (via 261 * the unique short val key), and call the appropriate callback. 262 */ 263 while ((c = getopt_long(argc, argv, short_opts, long_opts, NULL)) != -1) { 264 for (i = 0; i < num_options; ++i) { 265 if (sb_opt[i]->flag_short == c) { 266 if (sb_opt[i]->callback(state, optarg)) { 267 state->parse_err = sb_opt[i]->flag; 268 return 0; 269 } 270 break; 271 } 272 } 273 if (i == num_options) { 274 /* 275 * store the faulting flag for later display. we have to 276 * store the flag itself as the getopt parsing itself is 277 * tricky: need to handle the following flags (assume all 278 * of the below are unknown): 279 * -a optopt='a' optind=<next> 280 * -abbbb optopt='a' optind=<this> 281 * -aaaaa optopt='a' optind=<this> 282 * --a optopt=0 optind=<this> 283 * as you can see, it is impossible to determine the exact 284 * faulting flag without doing the parsing ourselves, so 285 * we just report the specific flag that failed. 286 */ 287 if (optopt) { 288 static char parse_err[3] = { '-', 0, '\0', }; 289 parse_err[1] = optopt; 290 state->parse_err = parse_err; 291 } else 292 state->parse_err = argv[optind - 1]; 293 break; 294 } 295 } 296 297 return 0; 298 } 299 300 void os_dirent_free(struct os_dirent_node *node) 301 { 302 struct os_dirent_node *next; 303 304 while (node) { 305 next = node->next; 306 free(node); 307 node = next; 308 } 309 } 310 311 int os_dirent_ls(const char *dirname, struct os_dirent_node **headp) 312 { 313 struct dirent entry, *result; 314 struct os_dirent_node *head, *node, *next; 315 struct stat buf; 316 DIR *dir; 317 int ret; 318 char *fname; 319 int len; 320 321 *headp = NULL; 322 dir = opendir(dirname); 323 if (!dir) 324 return -1; 325 326 /* Create a buffer for the maximum filename length */ 327 len = sizeof(entry.d_name) + strlen(dirname) + 2; 328 fname = malloc(len); 329 if (!fname) { 330 ret = -ENOMEM; 331 goto done; 332 } 333 334 for (node = head = NULL;; node = next) { 335 ret = readdir_r(dir, &entry, &result); 336 if (ret || !result) 337 break; 338 next = malloc(sizeof(*node) + strlen(entry.d_name) + 1); 339 if (!next) { 340 os_dirent_free(head); 341 ret = -ENOMEM; 342 goto done; 343 } 344 strcpy(next->name, entry.d_name); 345 switch (entry.d_type) { 346 case DT_REG: 347 next->type = OS_FILET_REG; 348 break; 349 case DT_DIR: 350 next->type = OS_FILET_DIR; 351 break; 352 case DT_LNK: 353 next->type = OS_FILET_LNK; 354 break; 355 } 356 next->size = 0; 357 snprintf(fname, len, "%s/%s", dirname, next->name); 358 if (!stat(fname, &buf)) 359 next->size = buf.st_size; 360 if (node) 361 node->next = next; 362 if (!head) 363 head = node; 364 } 365 *headp = head; 366 367 done: 368 closedir(dir); 369 return ret; 370 } 371 372 const char *os_dirent_typename[OS_FILET_COUNT] = { 373 " ", 374 "SYM", 375 "DIR", 376 "???", 377 }; 378 379 const char *os_dirent_get_typename(enum os_dirent_t type) 380 { 381 if (type >= 0 && type < OS_FILET_COUNT) 382 return os_dirent_typename[type]; 383 384 return os_dirent_typename[OS_FILET_UNKNOWN]; 385 } 386 387 ssize_t os_get_filesize(const char *fname) 388 { 389 struct stat buf; 390 int ret; 391 392 ret = stat(fname, &buf); 393 if (ret) 394 return ret; 395 return buf.st_size; 396 } 397 398 void os_putc(int ch) 399 { 400 putchar(ch); 401 } 402 403 void os_puts(const char *str) 404 { 405 while (*str) 406 os_putc(*str++); 407 } 408 409 int os_write_ram_buf(const char *fname) 410 { 411 struct sandbox_state *state = state_get_current(); 412 int fd, ret; 413 414 fd = open(fname, O_CREAT | O_WRONLY, 0777); 415 if (fd < 0) 416 return -ENOENT; 417 ret = write(fd, state->ram_buf, state->ram_size); 418 close(fd); 419 if (ret != state->ram_size) 420 return -EIO; 421 422 return 0; 423 } 424 425 int os_read_ram_buf(const char *fname) 426 { 427 struct sandbox_state *state = state_get_current(); 428 int fd, ret; 429 int size; 430 431 size = os_get_filesize(fname); 432 if (size < 0) 433 return -ENOENT; 434 if (size != state->ram_size) 435 return -ENOSPC; 436 fd = open(fname, O_RDONLY); 437 if (fd < 0) 438 return -ENOENT; 439 440 ret = read(fd, state->ram_buf, state->ram_size); 441 close(fd); 442 if (ret != state->ram_size) 443 return -EIO; 444 445 return 0; 446 } 447 448 static int make_exec(char *fname, const void *data, int size) 449 { 450 int fd; 451 452 strcpy(fname, "/tmp/u-boot.jump.XXXXXX"); 453 fd = mkstemp(fname); 454 if (fd < 0) 455 return -ENOENT; 456 if (write(fd, data, size) < 0) 457 return -EIO; 458 close(fd); 459 if (chmod(fname, 0777)) 460 return -ENOEXEC; 461 462 return 0; 463 } 464 465 static int add_args(char ***argvp, const char *add_args[], int count) 466 { 467 char **argv; 468 int argc; 469 470 for (argv = *argvp, argc = 0; (*argvp)[argc]; argc++) 471 ; 472 473 argv = malloc((argc + count + 1) * sizeof(char *)); 474 if (!argv) { 475 printf("Out of memory for %d argv\n", count); 476 return -ENOMEM; 477 } 478 memcpy(argv, *argvp, argc * sizeof(char *)); 479 memcpy(argv + argc, add_args, count * sizeof(char *)); 480 argv[argc + count] = NULL; 481 482 *argvp = argv; 483 return 0; 484 } 485 486 int os_jump_to_image(const void *dest, int size) 487 { 488 struct sandbox_state *state = state_get_current(); 489 char fname[30], mem_fname[30]; 490 int fd, err; 491 const char *extra_args[5]; 492 char **argv = state->argv; 493 #ifdef DEBUG 494 int argc, i; 495 #endif 496 497 err = make_exec(fname, dest, size); 498 if (err) 499 return err; 500 501 strcpy(mem_fname, "/tmp/u-boot.mem.XXXXXX"); 502 fd = mkstemp(mem_fname); 503 if (fd < 0) 504 return -ENOENT; 505 close(fd); 506 err = os_write_ram_buf(mem_fname); 507 if (err) 508 return err; 509 510 os_fd_restore(); 511 512 extra_args[0] = "-j"; 513 extra_args[1] = fname; 514 extra_args[2] = "-m"; 515 extra_args[3] = mem_fname; 516 extra_args[4] = "--rm_memory"; 517 err = add_args(&argv, extra_args, 518 sizeof(extra_args) / sizeof(extra_args[0])); 519 if (err) 520 return err; 521 522 #ifdef DEBUG 523 for (i = 0; argv[i]; i++) 524 printf("%d %s\n", i, argv[i]); 525 #endif 526 527 if (state_uninit()) 528 os_exit(2); 529 530 err = execv(fname, argv); 531 free(argv); 532 if (err) 533 return err; 534 535 return unlink(fname); 536 } 537