test.c revision 291ce17bc80d960492595c2b9c13c287b6353062
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
49char *host_base = NULL;
50struct termios term, oldterm;
51char *image;
52size_t image_size;
53int disk_fd = -1;
54
55uint64_t regs[16];
56uint64_t pc;
57
58void test_exit(void *arg, int v);
59
60/*
61 * Console i/o
62 */
63
64void
65test_putc(void *arg, int ch)
66{
67	char c = ch;
68
69	write(1, &c, 1);
70}
71
72int
73test_getc(void *arg)
74{
75	char c;
76
77	if (read(0, &c, 1) == 1)
78		return c;
79	return -1;
80}
81
82int
83test_poll(void *arg)
84{
85	int n;
86
87	if (ioctl(0, FIONREAD, &n) >= 0)
88		return (n > 0);
89	return (0);
90}
91
92/*
93 * Host filesystem i/o
94 */
95
96struct test_file {
97	int tf_isdir;
98	size_t tf_size;
99	struct stat tf_stat;
100	union {
101		int fd;
102		DIR *dir;
103	} tf_u;
104};
105
106int
107test_open(void *arg, const char *filename, void **h_return)
108{
109	struct stat st;
110	struct test_file *tf;
111	char path[PATH_MAX];
112
113	if (!host_base)
114		return (ENOENT);
115
116	strlcpy(path, host_base, PATH_MAX);
117	if (path[strlen(path) - 1] == '/')
118		path[strlen(path) - 1] = 0;
119	strlcat(path, filename, PATH_MAX);
120	tf = malloc(sizeof(struct test_file));
121	if (stat(path, &tf->tf_stat) < 0) {
122		free(tf);
123		return (errno);
124	}
125
126	tf->tf_size = st.st_size;
127	if (S_ISDIR(tf->tf_stat.st_mode)) {
128		tf->tf_isdir = 1;
129		tf->tf_u.dir = opendir(path);
130		if (!tf->tf_u.dir)
131			goto out;
132                *h_return = tf;
133		return (0);
134	}
135	if (S_ISREG(tf->tf_stat.st_mode)) {
136		tf->tf_isdir = 0;
137		tf->tf_u.fd = open(path, O_RDONLY);
138		if (tf->tf_u.fd < 0)
139			goto out;
140                *h_return = tf;
141		return (0);
142	}
143
144out:
145	free(tf);
146	return (EINVAL);
147}
148
149int
150test_close(void *arg, void *h)
151{
152	struct test_file *tf = h;
153
154	if (tf->tf_isdir)
155		closedir(tf->tf_u.dir);
156	else
157		close(tf->tf_u.fd);
158	free(tf);
159
160	return (0);
161}
162
163int
164test_isdir(void *arg, void *h)
165{
166	struct test_file *tf = h;
167
168	return (tf->tf_isdir);
169}
170
171int
172test_read(void *arg, void *h, void *dst, size_t size, size_t *resid_return)
173{
174	struct test_file *tf = h;
175	ssize_t sz;
176
177	if (tf->tf_isdir)
178		return (EINVAL);
179	sz = read(tf->tf_u.fd, dst, size);
180	if (sz < 0)
181		return (EINVAL);
182	*resid_return = size - sz;
183	return (0);
184}
185
186int
187test_readdir(void *arg, void *h, uint32_t *fileno_return, uint8_t *type_return,
188    size_t *namelen_return, char *name)
189{
190	struct test_file *tf = h;
191	struct dirent *dp;
192
193	if (!tf->tf_isdir)
194		return (EINVAL);
195
196	dp = readdir(tf->tf_u.dir);
197	if (!dp)
198		return (ENOENT);
199
200	/*
201	 * Note: d_namlen is in the range 0..255 and therefore less
202	 * than PATH_MAX so we don't need to test before copying.
203	 */
204	*fileno_return = dp->d_fileno;
205	*type_return = dp->d_type;
206	*namelen_return = dp->d_namlen;
207	memcpy(name, dp->d_name, dp->d_namlen);
208	name[dp->d_namlen] = 0;
209
210	return (0);
211}
212
213int
214test_seek(void *arg, void *h, uint64_t offset, int whence)
215{
216	struct test_file *tf = h;
217
218	if (tf->tf_isdir)
219		return (EINVAL);
220	if (lseek(tf->tf_u.fd, offset, whence) < 0)
221		return (errno);
222	return (0);
223}
224
225int
226test_stat(void *arg, void *h, int *mode_return, int *uid_return, int *gid_return,
227    uint64_t *size_return)
228{
229	struct test_file *tf = h;
230
231	*mode_return = tf->tf_stat.st_mode;
232	*uid_return = tf->tf_stat.st_uid;
233	*gid_return = tf->tf_stat.st_gid;
234	*size_return = tf->tf_stat.st_size;
235	return (0);
236}
237
238/*
239 * Disk image i/o
240 */
241
242int
243test_diskread(void *arg, int unit, uint64_t offset, void *dst, size_t size,
244    size_t *resid_return)
245{
246	ssize_t n;
247
248	if (unit != 0 || disk_fd == -1)
249		return (EIO);
250	n = pread(disk_fd, dst, size, offset);
251	if (n < 0)
252		return (errno);
253	*resid_return = size - n;
254	return (0);
255}
256
257int
258test_diskioctl(void *arg, int unit, u_long cmd, void *data)
259{
260	struct stat sb;
261
262	if (unit != 0 || disk_fd == -1)
263		return (EBADF);
264	switch (cmd) {
265	case DIOCGSECTORSIZE:
266		*(u_int *)data = 512;
267		break;
268	case DIOCGMEDIASIZE:
269		if (fstat(disk_fd, &sb) == 0)
270			*(off_t *)data = sb.st_size;
271		else
272			return (ENOTTY);
273		break;
274	default:
275		return (ENOTTY);
276	}
277	return (0);
278}
279
280/*
281 * Guest virtual machine i/o
282 *
283 * Note: guest addresses are kernel virtual
284 */
285
286int
287test_copyin(void *arg, const void *from, uint64_t to, size_t size)
288{
289
290	to &= 0x7fffffff;
291	if (to > image_size)
292		return (EFAULT);
293	if (to + size > image_size)
294		size = image_size - to;
295	memcpy(&image[to], from, size);
296	return(0);
297}
298
299int
300test_copyout(void *arg, uint64_t from, void *to, size_t size)
301{
302
303	from &= 0x7fffffff;
304	if (from > image_size)
305		return (EFAULT);
306	if (from + size > image_size)
307		size = image_size - from;
308	memcpy(to, &image[from], size);
309	return(0);
310}
311
312void
313test_setreg(void *arg, int r, uint64_t v)
314{
315
316	if (r < 0 || r >= 16)
317		return;
318	regs[r] = v;
319}
320
321void
322test_setmsr(void *arg, int r, uint64_t v)
323{
324}
325
326void
327test_setcr(void *arg, int r, uint64_t v)
328{
329}
330
331void
332test_setgdt(void *arg, uint64_t v, size_t sz)
333{
334}
335
336void
337test_exec(void *arg, uint64_t pc)
338{
339	printf("Execute at 0x%"PRIu64"\n", pc);
340	test_exit(arg, 0);
341}
342
343/*
344 * Misc
345 */
346
347void
348test_delay(void *arg, int usec)
349{
350
351	usleep(usec);
352}
353
354void
355test_exit(void *arg, int v)
356{
357
358	tcsetattr(0, TCSAFLUSH, &oldterm);
359	exit(v);
360}
361
362void
363test_getmem(void *arg, uint64_t *lowmem, uint64_t *highmem)
364{
365
366        *lowmem = 128*1024*1024;
367        *highmem = 0;
368}
369
370const char *
371test_getenv(void *arg, int idx)
372{
373	static const char *vars[] = {
374		"foo=bar",
375		"bar=barbar",
376		NULL
377	};
378
379	return (vars[idx]);
380}
381
382struct loader_callbacks cb = {
383	.putc = test_putc,
384	.getc = test_getc,
385	.poll = test_poll,
386
387	.open = test_open,
388	.close = test_close,
389	.isdir = test_isdir,
390	.read = test_read,
391	.readdir = test_readdir,
392	.seek = test_seek,
393	.stat = test_stat,
394
395	.diskread = test_diskread,
396	.diskioctl = test_diskioctl,
397
398	.copyin = test_copyin,
399	.copyout = test_copyout,
400	.setreg = test_setreg,
401	.setmsr = test_setmsr,
402	.setcr = test_setcr,
403        .setgdt = test_setgdt,
404	.exec = test_exec,
405
406	.delay = test_delay,
407	.exit = test_exit,
408        .getmem = test_getmem,
409
410	.getenv = test_getenv,
411};
412
413void
414usage()
415{
416
417	printf("usage: [-b <userboot shared object>] [-d <disk image path>] [-h <host filesystem path>\n");
418	exit(1);
419}
420
421int
422main(int argc, char** argv)
423{
424	void *h;
425	void (*func)(struct loader_callbacks *, void *, int, int) __dead2;
426	int opt;
427	char *disk_image = NULL;
428	const char *userboot_obj = "/boot/userboot.so";
429
430	while ((opt = getopt(argc, argv, "b:d:h:")) != -1) {
431		switch (opt) {
432		case 'b':
433			userboot_obj = optarg;
434			break;
435
436		case 'd':
437			disk_image = optarg;
438			break;
439
440		case 'h':
441			host_base = optarg;
442			break;
443
444		case '?':
445			usage();
446		}
447	}
448
449	h = dlopen(userboot_obj, RTLD_LOCAL);
450	if (!h) {
451		printf("%s\n", dlerror());
452		return (1);
453	}
454	func = dlsym(h, "loader_main");
455	if (!func) {
456		printf("%s\n", dlerror());
457		return (1);
458	}
459
460	image_size = 128*1024*1024;
461	image = malloc(image_size);
462	if (disk_image) {
463		disk_fd = open(disk_image, O_RDONLY);
464		if (disk_fd < 0)
465			err(1, "Can't open disk image '%s'", disk_image);
466	}
467
468	tcgetattr(0, &term);
469	oldterm = term;
470	term.c_iflag &= ~(ICRNL);
471	term.c_lflag &= ~(ICANON|ECHO);
472	tcsetattr(0, TCSAFLUSH, &term);
473
474	func(&cb, NULL, USERBOOT_VERSION_3, disk_fd >= 0);
475}
476