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
test_putc(void * arg,int ch)64 test_putc(void *arg, int ch)
65 {
66 char c = ch;
67
68 write(1, &c, 1);
69 }
70
71 int
test_getc(void * arg)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
test_poll(void * arg)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
test_open(void * arg,const char * filename,void ** h_return)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
test_close(void * arg,void * h)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
test_isdir(void * arg,void * h)163 test_isdir(void *arg, void *h)
164 {
165 struct test_file *tf = h;
166
167 return (tf->tf_isdir);
168 }
169
170 int
test_read(void * arg,void * h,void * dst,size_t size,size_t * resid_return)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
test_readdir(void * arg,void * h,uint32_t * fileno_return,uint8_t * type_return,size_t * namelen_return,char * name)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
test_seek(void * arg,void * h,uint64_t offset,int whence)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
test_stat(void * arg,void * h,struct stat * stp)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
test_diskread(void * arg,int unit,uint64_t offset,void * dst,size_t size,size_t * resid_return)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
test_diskwrite(void * arg,int unit,uint64_t offset,void * src,size_t size,size_t * resid_return)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
test_diskioctl(void * arg,int unit,u_long cmd,void * data)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
test_copyin(void * arg,const void * from,uint64_t to,size_t size)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
test_copyout(void * arg,uint64_t from,void * to,size_t size)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
test_setreg(void * arg,int r,uint64_t v)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
test_setmsr(void * arg,int r,uint64_t v)346 test_setmsr(void *arg, int r, uint64_t v)
347 {
348 }
349
350 void
test_setcr(void * arg,int r,uint64_t v)351 test_setcr(void *arg, int r, uint64_t v)
352 {
353 }
354
355 void
test_setgdt(void * arg,uint64_t v,size_t sz)356 test_setgdt(void *arg, uint64_t v, size_t sz)
357 {
358 }
359
360 void
test_exec(void * arg,uint64_t pc)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
test_delay(void * arg,int usec)372 test_delay(void *arg, int usec)
373 {
374
375 usleep(usec);
376 }
377
378 void
test_exit(void * arg,int v)379 test_exit(void *arg, int v)
380 {
381
382 tcsetattr(0, TCSAFLUSH, &oldterm);
383 exit(v);
384 }
385
386 void
test_getmem(void * arg,uint64_t * lowmem,uint64_t * highmem)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 *
test_getenv(void * arg,int idx)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
usage()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
main(int argc,char ** argv)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