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