1 /*-
2 * Copyright (c) 1994 Christos Zoulas
3 * Copyright (c) 1995 Frank van der Linden
4 * Copyright (c) 1995 Scott Bartram
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * from: svr4_util.c,v 1.5 1995/01/22 23:44:50 christos Exp
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: releng/10.0/sys/compat/linux/linux_util.c 235063 2012-05-05 19:42:38Z netchild $");
34
35 #include "opt_compat.h"
36 #include "opt_kdtrace.h"
37
38 #include <sys/param.h>
39 #include <sys/bus.h>
40 #include <sys/fcntl.h>
41 #include <sys/lock.h>
42 #include <sys/malloc.h>
43 #include <sys/kernel.h>
44 #include <sys/linker_set.h>
45 #include <sys/mutex.h>
46 #include <sys/namei.h>
47 #include <sys/proc.h>
48 #include <sys/sdt.h>
49 #include <sys/syscallsubr.h>
50 #include <sys/systm.h>
51 #include <sys/vnode.h>
52
53 #include <machine/stdarg.h>
54
55 #include <compat/linux/linux_util.h>
56 #ifdef COMPAT_LINUX32
57 #include <machine/../linux32/linux.h>
58 #else
59 #include <machine/../linux/linux.h>
60 #endif
61
62 #include <compat/linux/linux_dtrace.h>
63
64 const char linux_emul_path[] = "/compat/linux";
65
66 /* DTrace init */
67 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
68
69 /**
70 * DTrace probes in this module.
71 */
72 LIN_SDT_PROBE_DEFINE5(util, linux_emul_convpath, entry, "const char *",
73 "enum uio_seg", "char **", "int", "int");
74 LIN_SDT_PROBE_DEFINE1(util, linux_emul_convpath, return, "int");
75 LIN_SDT_PROBE_DEFINE1(util, linux_msg, entry, "const char *");
76 LIN_SDT_PROBE_DEFINE0(util, linux_msg, return);
77 LIN_SDT_PROBE_DEFINE2(util, linux_driver_get_name_dev, entry, "device_t",
78 "const char *");
79 LIN_SDT_PROBE_DEFINE0(util, linux_driver_get_name_dev, nullcall);
80 LIN_SDT_PROBE_DEFINE1(util, linux_driver_get_name_dev, return, "char *");
81 LIN_SDT_PROBE_DEFINE3(util, linux_driver_get_major_minor, entry, "char *",
82 "int *", "int *");
83 LIN_SDT_PROBE_DEFINE0(util, linux_driver_get_major_minor, nullcall);
84 LIN_SDT_PROBE_DEFINE1(util, linux_driver_get_major_minor, notfound, "char *");
85 LIN_SDT_PROBE_DEFINE3(util, linux_driver_get_major_minor, return, "int",
86 "int", "int");
87 LIN_SDT_PROBE_DEFINE0(util, linux_get_char_devices, entry);
88 LIN_SDT_PROBE_DEFINE1(util, linux_get_char_devices, return, "char *");
89 LIN_SDT_PROBE_DEFINE1(util, linux_free_get_char_devices, entry, "char *");
90 LIN_SDT_PROBE_DEFINE0(util, linux_free_get_char_devices, return);
91 LIN_SDT_PROBE_DEFINE1(util, linux_device_register_handler, entry,
92 "struct linux_device_handler *");
93 LIN_SDT_PROBE_DEFINE1(util, linux_device_register_handler, return, "int");
94 LIN_SDT_PROBE_DEFINE1(util, linux_device_unregister_handler, entry,
95 "struct linux_device_handler *");
96 LIN_SDT_PROBE_DEFINE1(util, linux_device_unregister_handler, return, "int");
97
98 /*
99 * Search an alternate path before passing pathname arguments on to
100 * system calls. Useful for keeping a separate 'emulation tree'.
101 *
102 * If cflag is set, we check if an attempt can be made to create the
103 * named file, i.e. we check if the directory it should be in exists.
104 */
105 int
106 linux_emul_convpath(struct thread *td, const char *path, enum uio_seg pathseg,
107 char **pbuf, int cflag, int dfd)
108 {
109 int retval;
110
111 LIN_SDT_PROBE5(util, linux_emul_convpath, entry, path, pathseg, pbuf,
112 cflag, dfd);
113
114 retval = kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf,
115 cflag, dfd);
116
117 LIN_SDT_PROBE1(util, linux_emul_convpath, return, retval);
118 return (retval);
119 }
120
121 void
122 linux_msg(const struct thread *td, const char *fmt, ...)
123 {
124 va_list ap;
125 struct proc *p;
126
127 LIN_SDT_PROBE1(util, linux_msg, entry, fmt);
128
129 p = td->td_proc;
130 printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm);
131 va_start(ap, fmt);
132 vprintf(fmt, ap);
133 va_end(ap);
134 printf("\n");
135
136 LIN_SDT_PROBE0(util, linux_msg, return);
137 }
138
139 struct device_element
140 {
141 TAILQ_ENTRY(device_element) list;
142 struct linux_device_handler entry;
143 };
144
145 static TAILQ_HEAD(, device_element) devices =
146 TAILQ_HEAD_INITIALIZER(devices);
147
148 static struct linux_device_handler null_handler =
149 { "mem", "mem", "null", "null", 1, 3, 1};
150
151 DATA_SET(linux_device_handler_set, null_handler);
152
153 char *
154 linux_driver_get_name_dev(device_t dev)
155 {
156 struct device_element *de;
157 const char *device_name = device_get_name(dev);
158
159 LIN_SDT_PROBE2(util, linux_driver_get_name_dev, entry, dev,
160 device_name);
161
162 if (device_name == NULL) {
163 LIN_SDT_PROBE0(util, linux_driver_get_name_dev, nullcall);
164 LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return, NULL);
165 return NULL;
166 }
167 TAILQ_FOREACH(de, &devices, list) {
168 if (strcmp(device_name, de->entry.bsd_driver_name) == 0) {
169 LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return,
170 de->entry.linux_driver_name);
171 return (de->entry.linux_driver_name);
172 }
173 }
174
175 LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return, NULL);
176 return NULL;
177 }
178
179 int
180 linux_driver_get_major_minor(const char *node, int *major, int *minor)
181 {
182 struct device_element *de;
183
184 LIN_SDT_PROBE3(util, linux_driver_get_major_minor, entry, node, major,
185 minor);
186
187 if (node == NULL || major == NULL || minor == NULL) {
188 LIN_SDT_PROBE0(util, linux_driver_get_major_minor, nullcall);
189 LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 1,
190 0, 0);
191 return 1;
192 }
193
194 if (strlen(node) > strlen("pts/") &&
195 strncmp(node, "pts/", strlen("pts/")) == 0) {
196 unsigned long devno;
197
198 /*
199 * Linux checks major and minors of the slave device
200 * to make sure it's a pty device, so let's make him
201 * believe it is.
202 */
203 devno = strtoul(node + strlen("pts/"), NULL, 10);
204 *major = 136 + (devno / 256);
205 *minor = devno % 256;
206
207 LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 0,
208 *major, *minor);
209 return 0;
210 }
211
212 TAILQ_FOREACH(de, &devices, list) {
213 if (strcmp(node, de->entry.bsd_device_name) == 0) {
214 *major = de->entry.linux_major;
215 *minor = de->entry.linux_minor;
216
217 LIN_SDT_PROBE3(util, linux_driver_get_major_minor,
218 return, 0, *major, *minor);
219 return 0;
220 }
221 }
222
223 LIN_SDT_PROBE1(util, linux_driver_get_major_minor, notfound, node);
224 LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 1, 0, 0);
225 return 1;
226 }
227
228 char *
229 linux_get_char_devices()
230 {
231 struct device_element *de;
232 char *temp, *string, *last;
233 char formated[256];
234 int current_size = 0, string_size = 1024;
235
236 LIN_SDT_PROBE0(util, linux_get_char_devices, entry);
237
238 string = malloc(string_size, M_LINUX, M_WAITOK);
239 string[0] = '\000';
240 last = "";
241 TAILQ_FOREACH(de, &devices, list) {
242 if (!de->entry.linux_char_device)
243 continue;
244 temp = string;
245 if (strcmp(last, de->entry.bsd_driver_name) != 0) {
246 last = de->entry.bsd_driver_name;
247
248 snprintf(formated, sizeof(formated), "%3d %s\n",
249 de->entry.linux_major,
250 de->entry.linux_device_name);
251 if (strlen(formated) + current_size
252 >= string_size) {
253 string_size *= 2;
254 string = malloc(string_size,
255 M_LINUX, M_WAITOK);
256 bcopy(temp, string, current_size);
257 free(temp, M_LINUX);
258 }
259 strcat(string, formated);
260 current_size = strlen(string);
261 }
262 }
263
264 LIN_SDT_PROBE1(util, linux_get_char_devices, return, string);
265 return string;
266 }
267
268 void
269 linux_free_get_char_devices(char *string)
270 {
271
272 LIN_SDT_PROBE1(util, linux_get_char_devices, entry, string);
273
274 free(string, M_LINUX);
275
276 LIN_SDT_PROBE0(util, linux_get_char_devices, return);
277 }
278
279 static int linux_major_starting = 200;
280
281 int
282 linux_device_register_handler(struct linux_device_handler *d)
283 {
284 struct device_element *de;
285
286 LIN_SDT_PROBE1(util, linux_device_register_handler, entry, d);
287
288 if (d == NULL) {
289 LIN_SDT_PROBE1(util, linux_device_register_handler, return,
290 EINVAL);
291 return (EINVAL);
292 }
293
294 de = malloc(sizeof(*de), M_LINUX, M_WAITOK);
295 if (d->linux_major < 0) {
296 d->linux_major = linux_major_starting++;
297 }
298 bcopy(d, &de->entry, sizeof(*d));
299
300 /* Add the element to the list, sorted on span. */
301 TAILQ_INSERT_TAIL(&devices, de, list);
302
303 LIN_SDT_PROBE1(util, linux_device_register_handler, return, 0);
304 return (0);
305 }
306
307 int
308 linux_device_unregister_handler(struct linux_device_handler *d)
309 {
310 struct device_element *de;
311
312 LIN_SDT_PROBE1(util, linux_device_unregister_handler, entry, d);
313
314 if (d == NULL) {
315 LIN_SDT_PROBE1(util, linux_device_unregister_handler, return,
316 EINVAL);
317 return (EINVAL);
318 }
319
320 TAILQ_FOREACH(de, &devices, list) {
321 if (bcmp(d, &de->entry, sizeof(*d)) == 0) {
322 TAILQ_REMOVE(&devices, de, list);
323 free(de, M_LINUX);
324
325 LIN_SDT_PROBE1(util, linux_device_unregister_handler,
326 return, 0);
327 return (0);
328 }
329 }
330
331 LIN_SDT_PROBE1(util, linux_device_unregister_handler, return, EINVAL);
332 return (EINVAL);
333 }
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