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

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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: head/sys/compat/linux/linux_util.c 258541 2013-11-25 07:38:45Z attilio $");
34
35#include "opt_compat.h"
36
37#include <sys/param.h>
38#include <sys/bus.h>
39#include <sys/fcntl.h>
40#include <sys/lock.h>
41#include <sys/malloc.h>

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47#include <sys/sdt.h>
48#include <sys/syscallsubr.h>
49#include <sys/systm.h>
50#include <sys/vnode.h>
51
52#include <machine/stdarg.h>
53
54#include <compat/linux/linux_util.h>
55#ifdef COMPAT_LINUX32
56#include <machine/../linux32/linux.h>
57#else
58#include <machine/../linux/linux.h>
59#endif
60
61#include <compat/linux/linux_dtrace.h>
62
63const char linux_emul_path[] = "/compat/linux";
64
65/* DTrace init */
66LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
67
68/**
69 * DTrace probes in this module.
70 */
71LIN_SDT_PROBE_DEFINE5(util, linux_emul_convpath, entry, "const char *",
72 "enum uio_seg", "char **", "int", "int");
73LIN_SDT_PROBE_DEFINE1(util, linux_emul_convpath, return, "int");
74LIN_SDT_PROBE_DEFINE1(util, linux_msg, entry, "const char *");
75LIN_SDT_PROBE_DEFINE0(util, linux_msg, return);
76LIN_SDT_PROBE_DEFINE2(util, linux_driver_get_name_dev, entry, "device_t",
77 "const char *");
78LIN_SDT_PROBE_DEFINE0(util, linux_driver_get_name_dev, nullcall);
79LIN_SDT_PROBE_DEFINE1(util, linux_driver_get_name_dev, return, "char *");
80LIN_SDT_PROBE_DEFINE3(util, linux_driver_get_major_minor, entry, "char *",
81 "int *", "int *");
82LIN_SDT_PROBE_DEFINE0(util, linux_driver_get_major_minor, nullcall);
83LIN_SDT_PROBE_DEFINE1(util, linux_driver_get_major_minor, notfound, "char *");
84LIN_SDT_PROBE_DEFINE3(util, linux_driver_get_major_minor, return, "int",
85 "int", "int");
86LIN_SDT_PROBE_DEFINE0(util, linux_get_char_devices, entry);
87LIN_SDT_PROBE_DEFINE1(util, linux_get_char_devices, return, "char *");
88LIN_SDT_PROBE_DEFINE1(util, linux_free_get_char_devices, entry, "char *");
89LIN_SDT_PROBE_DEFINE0(util, linux_free_get_char_devices, return);
90LIN_SDT_PROBE_DEFINE1(util, linux_device_register_handler, entry,
91 "struct linux_device_handler *");
92LIN_SDT_PROBE_DEFINE1(util, linux_device_register_handler, return, "int");
93LIN_SDT_PROBE_DEFINE1(util, linux_device_unregister_handler, entry,
94 "struct linux_device_handler *");
95LIN_SDT_PROBE_DEFINE1(util, linux_device_unregister_handler, return, "int");
96
97/*
98 * Search an alternate path before passing pathname arguments on to
99 * system calls. Useful for keeping a separate 'emulation tree'.
100 *
101 * If cflag is set, we check if an attempt can be made to create the
102 * named file, i.e. we check if the directory it should be in exists.
103 */
104int
105linux_emul_convpath(struct thread *td, const char *path, enum uio_seg pathseg,
106 char **pbuf, int cflag, int dfd)
107{
108 int retval;
109
110 LIN_SDT_PROBE5(util, linux_emul_convpath, entry, path, pathseg, pbuf,
111 cflag, dfd);
112
113 retval = kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf,
114 cflag, dfd);
115
116 LIN_SDT_PROBE1(util, linux_emul_convpath, return, retval);
117 return (retval);
118}
119
120void
121linux_msg(const struct thread *td, const char *fmt, ...)
122{
123 va_list ap;
124 struct proc *p;
125
126 LIN_SDT_PROBE1(util, linux_msg, entry, fmt);
127
128 p = td->td_proc;
129 printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm);
130 va_start(ap, fmt);
131 vprintf(fmt, ap);
132 va_end(ap);
133 printf("\n");
134
135 LIN_SDT_PROBE0(util, linux_msg, return);
136}
137
138struct device_element
139{
140 TAILQ_ENTRY(device_element) list;
141 struct linux_device_handler entry;
142};
143

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150DATA_SET(linux_device_handler_set, null_handler);
151
152char *
153linux_driver_get_name_dev(device_t dev)
154{
155 struct device_element *de;
156 const char *device_name = device_get_name(dev);
157
158 LIN_SDT_PROBE2(util, linux_driver_get_name_dev, entry, dev,
159 device_name);
160
161 if (device_name == NULL) {
162 LIN_SDT_PROBE0(util, linux_driver_get_name_dev, nullcall);
163 LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return, NULL);
164 return NULL;
165 }
166 TAILQ_FOREACH(de, &devices, list) {
167 if (strcmp(device_name, de->entry.bsd_driver_name) == 0) {
168 LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return,
169 de->entry.linux_driver_name);
170 return (de->entry.linux_driver_name);
171 }
172 }
173
174 LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return, NULL);
175 return NULL;
176}
177
178int
179linux_driver_get_major_minor(const char *node, int *major, int *minor)
180{
181 struct device_element *de;
182
183 LIN_SDT_PROBE3(util, linux_driver_get_major_minor, entry, node, major,
184 minor);
185
186 if (node == NULL || major == NULL || minor == NULL) {
187 LIN_SDT_PROBE0(util, linux_driver_get_major_minor, nullcall);
188 LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 1,
189 0, 0);
190 return 1;
191 }
192
193 if (strlen(node) > strlen("pts/") &&
194 strncmp(node, "pts/", strlen("pts/")) == 0) {
195 unsigned long devno;
196
197 /*
198 * Linux checks major and minors of the slave device
199 * to make sure it's a pty device, so let's make him
200 * believe it is.
201 */
202 devno = strtoul(node + strlen("pts/"), NULL, 10);
203 *major = 136 + (devno / 256);
204 *minor = devno % 256;
205
206 LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 0,
207 *major, *minor);
208 return 0;
209 }
210
211 TAILQ_FOREACH(de, &devices, list) {
212 if (strcmp(node, de->entry.bsd_device_name) == 0) {
213 *major = de->entry.linux_major;
214 *minor = de->entry.linux_minor;
215
216 LIN_SDT_PROBE3(util, linux_driver_get_major_minor,
217 return, 0, *major, *minor);
218 return 0;
219 }
220 }
221
222 LIN_SDT_PROBE1(util, linux_driver_get_major_minor, notfound, node);
223 LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 1, 0, 0);
224 return 1;
225}
226
227char *
228linux_get_char_devices()
229{
230 struct device_element *de;
231 char *temp, *string, *last;
232 char formated[256];
233 int current_size = 0, string_size = 1024;
234
235 LIN_SDT_PROBE0(util, linux_get_char_devices, entry);
236
237 string = malloc(string_size, M_LINUX, M_WAITOK);
238 string[0] = '\000';
239 last = "";
240 TAILQ_FOREACH(de, &devices, list) {
241 if (!de->entry.linux_char_device)
242 continue;
243 temp = string;
244 if (strcmp(last, de->entry.bsd_driver_name) != 0) {

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255 bcopy(temp, string, current_size);
256 free(temp, M_LINUX);
257 }
258 strcat(string, formated);
259 current_size = strlen(string);
260 }
261 }
262
263 LIN_SDT_PROBE1(util, linux_get_char_devices, return, string);
264 return string;
265}
266
267void
268linux_free_get_char_devices(char *string)
269{
270
271 LIN_SDT_PROBE1(util, linux_get_char_devices, entry, string);
272
273 free(string, M_LINUX);
274
275 LIN_SDT_PROBE0(util, linux_get_char_devices, return);
276}
277
278static int linux_major_starting = 200;
279
280int
281linux_device_register_handler(struct linux_device_handler *d)
282{
283 struct device_element *de;
284
285 LIN_SDT_PROBE1(util, linux_device_register_handler, entry, d);
286
287 if (d == NULL) {
288 LIN_SDT_PROBE1(util, linux_device_register_handler, return,
289 EINVAL);
290 return (EINVAL);
291 }
292
293 de = malloc(sizeof(*de), M_LINUX, M_WAITOK);
294 if (d->linux_major < 0) {
295 d->linux_major = linux_major_starting++;
296 }
297 bcopy(d, &de->entry, sizeof(*d));
298
299 /* Add the element to the list, sorted on span. */
300 TAILQ_INSERT_TAIL(&devices, de, list);
301
302 LIN_SDT_PROBE1(util, linux_device_register_handler, return, 0);
303 return (0);
304}
305
306int
307linux_device_unregister_handler(struct linux_device_handler *d)
308{
309 struct device_element *de;
310
311 LIN_SDT_PROBE1(util, linux_device_unregister_handler, entry, d);
312
313 if (d == NULL) {
314 LIN_SDT_PROBE1(util, linux_device_unregister_handler, return,
315 EINVAL);
316 return (EINVAL);
317 }
318
319 TAILQ_FOREACH(de, &devices, list) {
320 if (bcmp(d, &de->entry, sizeof(*d)) == 0) {
321 TAILQ_REMOVE(&devices, de, list);
322 free(de, M_LINUX);
323
324 LIN_SDT_PROBE1(util, linux_device_unregister_handler,
325 return, 0);
326 return (0);
327 }
328 }
329
330 LIN_SDT_PROBE1(util, linux_device_unregister_handler, return, EINVAL);
331 return (EINVAL);
332}