test.c revision 455dcd93bd3382bc9015d5b88f769363d4f00490
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;
53
54uint64_t regs[16];
55uint64_t pc;
56int *disk_fd;
57int disk_index = -1;
58
59void test_exit(void *arg, int v);
60
61/*
62 * Console i/o
63 */
64
65void
66test_putc(void *arg, int ch)
67{
68	char c = ch;
69
70	write(1, &c, 1);
71}
72
73int
74test_getc(void *arg)
75{
76	char c;
77
78	if (read(0, &c, 1) == 1)
79		return c;
80	return -1;
81}
82
83int
84test_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
97struct 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
107int
108test_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
145out:
146	free(tf);
147	return (EINVAL);
148}
149
150int
151test_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
164int
165test_isdir(void *arg, void *h)
166{
167	struct test_file *tf = h;
168
169	return (tf->tf_isdir);
170}
171
172int
173test_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
187int
188test_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
214int
215test_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
226int
227test_stat(void *arg, void *h, int *mode_return, int *uid_return, int *gid_return,
228    uint64_t *size_return)
229{
230	struct test_file *tf = h;
231
232	*mode_return = tf->tf_stat.st_mode;
233	*uid_return = tf->tf_stat.st_uid;
234	*gid_return = tf->tf_stat.st_gid;
235	*size_return = tf->tf_stat.st_size;
236	return (0);
237}
238
239/*
240 * Disk image i/o
241 */
242
243int
244test_diskread(void *arg, int unit, uint64_t offset, void *dst, size_t size,
245    size_t *resid_return)
246{
247	ssize_t n;
248
249	if (unit > disk_index || disk_fd[unit] == -1)
250		return (EIO);
251	n = pread(disk_fd[unit], dst, size, offset);
252	if (n < 0)
253		return (errno);
254	*resid_return = size - n;
255	return (0);
256}
257
258int
259test_diskioctl(void *arg, int unit, u_long cmd, void *data)
260{
261	struct stat sb;
262
263	if (unit > disk_index || disk_fd[unit] == -1)
264		return (EBADF);
265	switch (cmd) {
266	case DIOCGSECTORSIZE:
267		*(u_int *)data = 512;
268		break;
269	case DIOCGMEDIASIZE:
270		if (fstat(disk_fd[unit], &sb) == 0)
271			*(off_t *)data = sb.st_size;
272		else
273			return (ENOTTY);
274		break;
275	default:
276		return (ENOTTY);
277	}
278	return (0);
279}
280
281/*
282 * Guest virtual machine i/o
283 *
284 * Note: guest addresses are kernel virtual
285 */
286
287int
288test_copyin(void *arg, const void *from, uint64_t to, size_t size)
289{
290
291	to &= 0x7fffffff;
292	if (to > image_size)
293		return (EFAULT);
294	if (to + size > image_size)
295		size = image_size - to;
296	memcpy(&image[to], from, size);
297	return(0);
298}
299
300int
301test_copyout(void *arg, uint64_t from, void *to, size_t size)
302{
303
304	from &= 0x7fffffff;
305	if (from > image_size)
306		return (EFAULT);
307	if (from + size > image_size)
308		size = image_size - from;
309	memcpy(to, &image[from], size);
310	return(0);
311}
312
313void
314test_setreg(void *arg, int r, uint64_t v)
315{
316
317	if (r < 0 || r >= 16)
318		return;
319	regs[r] = v;
320}
321
322void
323test_setmsr(void *arg, int r, uint64_t v)
324{
325}
326
327void
328test_setcr(void *arg, int r, uint64_t v)
329{
330}
331
332void
333test_setgdt(void *arg, uint64_t v, size_t sz)
334{
335}
336
337void
338test_exec(void *arg, uint64_t pc)
339{
340	printf("Execute at 0x%"PRIx64"\n", pc);
341	test_exit(arg, 0);
342}
343
344/*
345 * Misc
346 */
347
348void
349test_delay(void *arg, int usec)
350{
351
352	usleep(usec);
353}
354
355void
356test_exit(void *arg, int v)
357{
358
359	tcsetattr(0, TCSAFLUSH, &oldterm);
360	exit(v);
361}
362
363void
364test_getmem(void *arg, uint64_t *lowmem, uint64_t *highmem)
365{
366
367        *lowmem = 128*1024*1024;
368        *highmem = 0;
369}
370
371char *
372test_getenv(void *arg, int idx)
373{
374	static char *vars[] = {
375		"foo=bar",
376		"bar=barbar",
377		NULL
378	};
379
380	return (vars[idx]);
381}
382
383struct loader_callbacks cb = {
384	.putc = test_putc,
385	.getc = test_getc,
386	.poll = test_poll,
387
388	.open = test_open,
389	.close = test_close,
390	.isdir = test_isdir,
391	.read = test_read,
392	.readdir = test_readdir,
393	.seek = test_seek,
394	.stat = test_stat,
395
396	.diskread = test_diskread,
397	.diskioctl = test_diskioctl,
398
399	.copyin = test_copyin,
400	.copyout = test_copyout,
401	.setreg = test_setreg,
402	.setmsr = test_setmsr,
403	.setcr = test_setcr,
404        .setgdt = test_setgdt,
405	.exec = test_exec,
406
407	.delay = test_delay,
408	.exit = test_exit,
409        .getmem = test_getmem,
410
411	.getenv = test_getenv,
412};
413
414void
415usage()
416{
417
418	printf("usage: [-b <userboot shared object>] [-d <disk image path>] [-h <host filesystem path>\n");
419	exit(1);
420}
421
422int
423main(int argc, char** argv)
424{
425	void *h;
426	void (*func)(struct loader_callbacks *, void *, int, int) __dead2;
427	int opt;
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_index++;
438			disk_fd = reallocarray(disk_fd, disk_index + 1,
439			    sizeof (int));
440			disk_fd[disk_index] = open(optarg, O_RDONLY);
441			if (disk_fd[disk_index] < 0)
442				err(1, "Can't open disk image '%s'", optarg);
443			break;
444
445		case 'h':
446			host_base = optarg;
447			break;
448
449		case '?':
450			usage();
451		}
452	}
453
454	h = dlopen(userboot_obj, RTLD_LOCAL);
455	if (!h) {
456		printf("%s\n", dlerror());
457		return (1);
458	}
459	func = dlsym(h, "loader_main");
460	if (!func) {
461		printf("%s\n", dlerror());
462		return (1);
463	}
464
465	image_size = 128*1024*1024;
466	image = malloc(image_size);
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_index + 1);
475}
476