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/11.1/sys/compat/linux/linux_util.c 283441 2015-05-24 16:41:39Z dchagin $");
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>
42 #include <sys/kernel.h>
43 #include <sys/linker_set.h>
44 #include <sys/mutex.h>
45 #include <sys/namei.h>
46 #include <sys/proc.h>
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
56 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");
57 MALLOC_DEFINE(M_EPOLL, "lepoll", "Linux events structures");
58 MALLOC_DEFINE(M_FUTEX, "futex", "Linux futexes");
59 MALLOC_DEFINE(M_FUTEX_WP, "futex wp", "Linux futex waiting proc");
60
61 const char linux_emul_path[] = "/compat/linux";
62
63 /*
64 * Search an alternate path before passing pathname arguments on to
65 * system calls. Useful for keeping a separate 'emulation tree'.
66 *
67 * If cflag is set, we check if an attempt can be made to create the
68 * named file, i.e. we check if the directory it should be in exists.
69 */
70 int
71 linux_emul_convpath(struct thread *td, const char *path, enum uio_seg pathseg,
72 char **pbuf, int cflag, int dfd)
73 {
74 int retval;
75
76 retval = kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf,
77 cflag, dfd);
78
79 return (retval);
80 }
81
82 void
83 linux_msg(const struct thread *td, const char *fmt, ...)
84 {
85 va_list ap;
86 struct proc *p;
87
88 p = td->td_proc;
89 printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm);
90 va_start(ap, fmt);
91 vprintf(fmt, ap);
92 va_end(ap);
93 printf("\n");
94 }
95
96 struct device_element
97 {
98 TAILQ_ENTRY(device_element) list;
99 struct linux_device_handler entry;
100 };
101
102 static TAILQ_HEAD(, device_element) devices =
103 TAILQ_HEAD_INITIALIZER(devices);
104
105 static struct linux_device_handler null_handler =
106 { "mem", "mem", "null", "null", 1, 3, 1};
107
108 DATA_SET(linux_device_handler_set, null_handler);
109
110 char *
111 linux_driver_get_name_dev(device_t dev)
112 {
113 struct device_element *de;
114 const char *device_name = device_get_name(dev);
115
116 if (device_name == NULL)
117 return NULL;
118 TAILQ_FOREACH(de, &devices, list) {
119 if (strcmp(device_name, de->entry.bsd_driver_name) == 0)
120 return (de->entry.linux_driver_name);
121 }
122
123 return (NULL);
124 }
125
126 int
127 linux_driver_get_major_minor(const char *node, int *major, int *minor)
128 {
129 struct device_element *de;
130
131 if (node == NULL || major == NULL || minor == NULL)
132 return 1;
133
134 if (strlen(node) > strlen("pts/") &&
135 strncmp(node, "pts/", strlen("pts/")) == 0) {
136 unsigned long devno;
137
138 /*
139 * Linux checks major and minors of the slave device
140 * to make sure it's a pty device, so let's make him
141 * believe it is.
142 */
143 devno = strtoul(node + strlen("pts/"), NULL, 10);
144 *major = 136 + (devno / 256);
145 *minor = devno % 256;
146
147 return (0);
148 }
149
150 TAILQ_FOREACH(de, &devices, list) {
151 if (strcmp(node, de->entry.bsd_device_name) == 0) {
152 *major = de->entry.linux_major;
153 *minor = de->entry.linux_minor;
154 return (0);
155 }
156 }
157
158 return (1);
159 }
160
161 char *
162 linux_get_char_devices()
163 {
164 struct device_element *de;
165 char *temp, *string, *last;
166 char formated[256];
167 int current_size = 0, string_size = 1024;
168
169 string = malloc(string_size, M_LINUX, M_WAITOK);
170 string[0] = '\000';
171 last = "";
172 TAILQ_FOREACH(de, &devices, list) {
173 if (!de->entry.linux_char_device)
174 continue;
175 temp = string;
176 if (strcmp(last, de->entry.bsd_driver_name) != 0) {
177 last = de->entry.bsd_driver_name;
178
179 snprintf(formated, sizeof(formated), "%3d %s\n",
180 de->entry.linux_major,
181 de->entry.linux_device_name);
182 if (strlen(formated) + current_size
183 >= string_size) {
184 string_size *= 2;
185 string = malloc(string_size,
186 M_LINUX, M_WAITOK);
187 bcopy(temp, string, current_size);
188 free(temp, M_LINUX);
189 }
190 strcat(string, formated);
191 current_size = strlen(string);
192 }
193 }
194
195 return (string);
196 }
197
198 void
199 linux_free_get_char_devices(char *string)
200 {
201
202 free(string, M_LINUX);
203 }
204
205 static int linux_major_starting = 200;
206
207 int
208 linux_device_register_handler(struct linux_device_handler *d)
209 {
210 struct device_element *de;
211
212 if (d == NULL)
213 return (EINVAL);
214
215 de = malloc(sizeof(*de), M_LINUX, M_WAITOK);
216 if (d->linux_major < 0) {
217 d->linux_major = linux_major_starting++;
218 }
219 bcopy(d, &de->entry, sizeof(*d));
220
221 /* Add the element to the list, sorted on span. */
222 TAILQ_INSERT_TAIL(&devices, de, list);
223
224 return (0);
225 }
226
227 int
228 linux_device_unregister_handler(struct linux_device_handler *d)
229 {
230 struct device_element *de;
231
232 if (d == NULL)
233 return (EINVAL);
234
235 TAILQ_FOREACH(de, &devices, list) {
236 if (bcmp(d, &de->entry, sizeof(*d)) == 0) {
237 TAILQ_REMOVE(&devices, de, list);
238 free(de, M_LINUX);
239
240 return (0);
241 }
242 }
243
244 return (EINVAL);
245 }
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