1 /*- 2 * Copyright (c) 2011 Google, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/types.h> 28 #include <sys/disk.h> 29 #include <sys/ioctl.h> 30 #include <sys/stat.h> 31 #include <dirent.h> 32 #include <dlfcn.h> 33 #include <err.h> 34 #include <errno.h> 35 #include <fcntl.h> 36 #include <getopt.h> 37 #include <inttypes.h> 38 #include <limits.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <termios.h> 43 #include <unistd.h> 44 45 #include <userboot.h> 46 47 char *host_base = NULL; 48 struct termios term, oldterm; 49 char *image; 50 size_t image_size; 51 52 uint64_t regs[16]; 53 uint64_t pc; 54 int *disk_fd; 55 int disk_index = -1; 56 57 void test_exit(void *arg, int v); 58 59 /* 60 * Console i/o 61 */ 62 63 void 64 test_putc(void *arg, int ch) 65 { 66 char c = ch; 67 68 write(1, &c, 1); 69 } 70 71 int 72 test_getc(void *arg) 73 { 74 char c; 75 76 if (read(0, &c, 1) == 1) 77 return c; 78 return -1; 79 } 80 81 int 82 test_poll(void *arg) 83 { 84 int n; 85 86 if (ioctl(0, FIONREAD, &n) >= 0) 87 return (n > 0); 88 return (0); 89 } 90 91 /* 92 * Host filesystem i/o 93 */ 94 95 struct test_file { 96 int tf_isdir; 97 size_t tf_size; 98 struct stat tf_stat; 99 union { 100 int fd; 101 DIR *dir; 102 } tf_u; 103 }; 104 105 int 106 test_open(void *arg, const char *filename, void **h_return) 107 { 108 struct stat st; 109 struct test_file *tf; 110 char path[PATH_MAX]; 111 112 if (!host_base) 113 return (ENOENT); 114 115 strlcpy(path, host_base, PATH_MAX); 116 if (path[strlen(path) - 1] == '/') 117 path[strlen(path) - 1] = 0; 118 strlcat(path, filename, PATH_MAX); 119 tf = malloc(sizeof(struct test_file)); 120 if (stat(path, &tf->tf_stat) < 0) { 121 free(tf); 122 return (errno); 123 } 124 125 tf->tf_size = st.st_size; 126 if (S_ISDIR(tf->tf_stat.st_mode)) { 127 tf->tf_isdir = 1; 128 tf->tf_u.dir = opendir(path); 129 if (!tf->tf_u.dir) 130 goto out; 131 *h_return = tf; 132 return (0); 133 } 134 if (S_ISREG(tf->tf_stat.st_mode)) { 135 tf->tf_isdir = 0; 136 tf->tf_u.fd = open(path, O_RDONLY); 137 if (tf->tf_u.fd < 0) 138 goto out; 139 *h_return = tf; 140 return (0); 141 } 142 143 out: 144 free(tf); 145 return (EINVAL); 146 } 147 148 int 149 test_close(void *arg, void *h) 150 { 151 struct test_file *tf = h; 152 153 if (tf->tf_isdir) 154 closedir(tf->tf_u.dir); 155 else 156 close(tf->tf_u.fd); 157 free(tf); 158 159 return (0); 160 } 161 162 int 163 test_isdir(void *arg, void *h) 164 { 165 struct test_file *tf = h; 166 167 return (tf->tf_isdir); 168 } 169 170 int 171 test_read(void *arg, void *h, void *dst, size_t size, size_t *resid_return) 172 { 173 struct test_file *tf = h; 174 ssize_t sz; 175 176 if (tf->tf_isdir) 177 return (EINVAL); 178 sz = read(tf->tf_u.fd, dst, size); 179 if (sz < 0) 180 return (EINVAL); 181 *resid_return = size - sz; 182 return (0); 183 } 184 185 int 186 test_readdir(void *arg, void *h, uint32_t *fileno_return, uint8_t *type_return, 187 size_t *namelen_return, char *name) 188 { 189 struct test_file *tf = h; 190 struct dirent *dp; 191 192 if (!tf->tf_isdir) 193 return (EINVAL); 194 195 dp = readdir(tf->tf_u.dir); 196 if (!dp) 197 return (ENOENT); 198 199 /* 200 * Note: d_namlen is in the range 0..255 and therefore less 201 * than PATH_MAX so we don't need to test before copying. 202 */ 203 *fileno_return = dp->d_fileno; 204 *type_return = dp->d_type; 205 *namelen_return = dp->d_namlen; 206 memcpy(name, dp->d_name, dp->d_namlen); 207 name[dp->d_namlen] = 0; 208 209 return (0); 210 } 211 212 int 213 test_seek(void *arg, void *h, uint64_t offset, int whence) 214 { 215 struct test_file *tf = h; 216 217 if (tf->tf_isdir) 218 return (EINVAL); 219 if (lseek(tf->tf_u.fd, offset, whence) < 0) 220 return (errno); 221 return (0); 222 } 223 224 int 225 test_stat(void *arg, void *h, struct stat *stp) 226 { 227 struct test_file *tf = h; 228 229 if (!stp) 230 return (-1); 231 memset(stp, 0, sizeof(struct stat)); 232 stp->st_mode = tf->tf_stat.st_mode; 233 stp->st_uid = tf->tf_stat.st_uid; 234 stp->st_gid = tf->tf_stat.st_gid; 235 stp->st_size = tf->tf_stat.st_size; 236 stp->st_ino = tf->tf_stat.st_ino; 237 stp->st_dev = tf->tf_stat.st_dev; 238 stp->st_mtime = tf->tf_stat.st_mtime; 239 return (0); 240 } 241 242 /* 243 * Disk image i/o 244 */ 245 246 int 247 test_diskread(void *arg, int unit, uint64_t offset, void *dst, size_t size, 248 size_t *resid_return) 249 { 250 ssize_t n; 251 252 if (unit > disk_index || disk_fd[unit] == -1) 253 return (EIO); 254 n = pread(disk_fd[unit], dst, size, offset); 255 if (n == 0) { 256 printf("%s: end of disk (%ju)\n", __func__, (intmax_t)offset); 257 return (EIO); 258 } 259 260 if (n < 0) 261 return (errno); 262 *resid_return = size - n; 263 return (0); 264 } 265 266 int 267 test_diskwrite(void *arg, int unit, uint64_t offset, void *src, size_t size, 268 size_t *resid_return) 269 { 270 ssize_t n; 271 272 if (unit > disk_index || disk_fd[unit] == -1) 273 return (EIO); 274 n = pwrite(disk_fd[unit], src, size, offset); 275 if (n < 0) 276 return (errno); 277 *resid_return = size - n; 278 return (0); 279 } 280 281 int 282 test_diskioctl(void *arg, int unit, u_long cmd, void *data) 283 { 284 struct stat sb; 285 286 if (unit > disk_index || disk_fd[unit] == -1) 287 return (EBADF); 288 switch (cmd) { 289 case DIOCGSECTORSIZE: 290 *(u_int *)data = 512; 291 break; 292 case DIOCGMEDIASIZE: 293 if (fstat(disk_fd[unit], &sb) == 0) 294 *(off_t *)data = sb.st_size; 295 else 296 return (ENOTTY); 297 break; 298 default: 299 return (ENOTTY); 300 } 301 return (0); 302 } 303 304 /* 305 * Guest virtual machine i/o 306 * 307 * Note: guest addresses are kernel virtual 308 */ 309 310 int 311 test_copyin(void *arg, const void *from, uint64_t to, size_t size) 312 { 313 314 to &= 0x7fffffff; 315 if (to > image_size) 316 return (EFAULT); 317 if (to + size > image_size) 318 size = image_size - to; 319 memcpy(&image[to], from, size); 320 return(0); 321 } 322 323 int 324 test_copyout(void *arg, uint64_t from, void *to, size_t size) 325 { 326 327 from &= 0x7fffffff; 328 if (from > image_size) 329 return (EFAULT); 330 if (from + size > image_size) 331 size = image_size - from; 332 memcpy(to, &image[from], size); 333 return(0); 334 } 335 336 void 337 test_setreg(void *arg, int r, uint64_t v) 338 { 339 340 if (r < 0 || r >= 16) 341 return; 342 regs[r] = v; 343 } 344 345 void 346 test_setmsr(void *arg, int r, uint64_t v) 347 { 348 } 349 350 void 351 test_setcr(void *arg, int r, uint64_t v) 352 { 353 } 354 355 void 356 test_setgdt(void *arg, uint64_t v, size_t sz) 357 { 358 } 359 360 void 361 test_exec(void *arg, uint64_t pc) 362 { 363 printf("Execute at 0x%"PRIx64"\n", pc); 364 test_exit(arg, 0); 365 } 366 367 /* 368 * Misc 369 */ 370 371 void 372 test_delay(void *arg, int usec) 373 { 374 375 usleep(usec); 376 } 377 378 void 379 test_exit(void *arg, int v) 380 { 381 382 tcsetattr(0, TCSAFLUSH, &oldterm); 383 exit(v); 384 } 385 386 void 387 test_getmem(void *arg, uint64_t *lowmem, uint64_t *highmem) 388 { 389 390 *lowmem = 128*1024*1024; 391 *highmem = 0; 392 } 393 394 char * 395 test_getenv(void *arg, int idx) 396 { 397 static char *vars[] = { 398 "foo=bar", 399 "bar=barbar", 400 NULL 401 }; 402 403 return (vars[idx]); 404 } 405 406 struct loader_callbacks cb = { 407 .putc = test_putc, 408 .getc = test_getc, 409 .poll = test_poll, 410 411 .open = test_open, 412 .close = test_close, 413 .isdir = test_isdir, 414 .read = test_read, 415 .readdir = test_readdir, 416 .seek = test_seek, 417 .stat = test_stat, 418 419 .diskread = test_diskread, 420 .diskwrite = test_diskwrite, 421 .diskioctl = test_diskioctl, 422 423 .copyin = test_copyin, 424 .copyout = test_copyout, 425 .setreg = test_setreg, 426 .setmsr = test_setmsr, 427 .setcr = test_setcr, 428 .setgdt = test_setgdt, 429 .exec = test_exec, 430 431 .delay = test_delay, 432 .exit = test_exit, 433 .getmem = test_getmem, 434 435 .getenv = test_getenv, 436 }; 437 438 void 439 usage() 440 { 441 442 printf("usage: [-b <userboot shared object>] [-d <disk image path>] [-h <host filesystem path>\n"); 443 exit(1); 444 } 445 446 int 447 main(int argc, char** argv) 448 { 449 void *h; 450 void (*func)(struct loader_callbacks *, void *, int, int) __dead2; 451 int opt; 452 const char *userboot_obj = "/boot/userboot.so"; 453 int oflag = O_RDONLY; 454 455 while ((opt = getopt(argc, argv, "wb:d:h:")) != -1) { 456 switch (opt) { 457 case 'b': 458 userboot_obj = optarg; 459 break; 460 461 case 'd': 462 disk_index++; 463 disk_fd = reallocarray(disk_fd, disk_index + 1, 464 sizeof (int)); 465 disk_fd[disk_index] = open(optarg, oflag); 466 if (disk_fd[disk_index] < 0) 467 err(1, "Can't open disk image '%s'", optarg); 468 break; 469 470 case 'h': 471 host_base = optarg; 472 break; 473 474 case 'w': 475 oflag = O_RDWR; 476 break; 477 478 case '?': 479 usage(); 480 } 481 } 482 483 h = dlopen(userboot_obj, RTLD_LOCAL); 484 if (!h) { 485 printf("%s\n", dlerror()); 486 return (1); 487 } 488 func = dlsym(h, "loader_main"); 489 if (!func) { 490 printf("%s\n", dlerror()); 491 return (1); 492 } 493 494 image_size = 128*1024*1024; 495 image = malloc(image_size); 496 497 tcgetattr(0, &term); 498 oldterm = term; 499 term.c_iflag &= ~(ICRNL); 500 term.c_lflag &= ~(ICANON|ECHO); 501 tcsetattr(0, TCSAFLUSH, &term); 502 503 func(&cb, NULL, USERBOOT_VERSION_3, disk_index + 1); 504 } 505