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 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 #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 63 const char linux_emul_path[] = "/compat/linux"; 64 65 /* DTrace init */ 66 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); 67 68 /** 69 * DTrace probes in this module. 70 */ 71 LIN_SDT_PROBE_DEFINE5(util, linux_emul_convpath, entry, "const char *", 72 "enum uio_seg", "char **", "int", "int"); 73 LIN_SDT_PROBE_DEFINE1(util, linux_emul_convpath, return, "int"); 74 LIN_SDT_PROBE_DEFINE1(util, linux_msg, entry, "const char *"); 75 LIN_SDT_PROBE_DEFINE0(util, linux_msg, return); 76 LIN_SDT_PROBE_DEFINE2(util, linux_driver_get_name_dev, entry, "device_t", 77 "const char *"); 78 LIN_SDT_PROBE_DEFINE0(util, linux_driver_get_name_dev, nullcall); 79 LIN_SDT_PROBE_DEFINE1(util, linux_driver_get_name_dev, return, "char *"); 80 LIN_SDT_PROBE_DEFINE3(util, linux_driver_get_major_minor, entry, "char *", 81 "int *", "int *"); 82 LIN_SDT_PROBE_DEFINE0(util, linux_driver_get_major_minor, nullcall); 83 LIN_SDT_PROBE_DEFINE1(util, linux_driver_get_major_minor, notfound, "char *"); 84 LIN_SDT_PROBE_DEFINE3(util, linux_driver_get_major_minor, return, "int", 85 "int", "int"); 86 LIN_SDT_PROBE_DEFINE0(util, linux_get_char_devices, entry); 87 LIN_SDT_PROBE_DEFINE1(util, linux_get_char_devices, return, "char *"); 88 LIN_SDT_PROBE_DEFINE1(util, linux_free_get_char_devices, entry, "char *"); 89 LIN_SDT_PROBE_DEFINE0(util, linux_free_get_char_devices, return); 90 LIN_SDT_PROBE_DEFINE1(util, linux_device_register_handler, entry, 91 "struct linux_device_handler *"); 92 LIN_SDT_PROBE_DEFINE1(util, linux_device_register_handler, return, "int"); 93 LIN_SDT_PROBE_DEFINE1(util, linux_device_unregister_handler, entry, 94 "struct linux_device_handler *"); 95 LIN_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 */ 104 int 105 linux_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 } 119 120 void 121 linux_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 } 137 138 struct device_element 139 { 140 TAILQ_ENTRY(device_element) list; 141 struct linux_device_handler entry; 142 }; 143 144 static TAILQ_HEAD(, device_element) devices = 145 TAILQ_HEAD_INITIALIZER(devices); 146 147 static struct linux_device_handler null_handler = 148 { "mem", "mem", "null", "null", 1, 3, 1}; 149 150 DATA_SET(linux_device_handler_set, null_handler); 151 152 char * 153 linux_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 } 177 178 int 179 linux_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 } 226 227 char * 228 linux_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) { 245 last = de->entry.bsd_driver_name; 246 247 snprintf(formated, sizeof(formated), "%3d %s\n", 248 de->entry.linux_major, 249 de->entry.linux_device_name); 250 if (strlen(formated) + current_size 251 >= string_size) { 252 string_size *= 2; 253 string = malloc(string_size, 254 M_LINUX, M_WAITOK); 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 } 266 267 void 268 linux_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 } 277 278 static int linux_major_starting = 200; 279 280 int 281 linux_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 } 305 306 int 307 linux_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 } 333