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("$FreeBSD$"); 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 } 334