1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1994 Christos Zoulas 5 * Copyright (c) 1995 Frank van der Linden 6 * Copyright (c) 1995 Scott Bartram 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * from: svr4_util.c,v 1.5 1995/01/22 23:44:50 christos Exp 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include <sys/param.h> 38 #include <sys/bus.h> 39 #include <sys/conf.h> 40 #include <sys/fcntl.h> 41 #include <sys/jail.h> 42 #include <sys/malloc.h> 43 #include <sys/namei.h> 44 #include <sys/proc.h> 45 #include <sys/syscallsubr.h> 46 #include <sys/vnode.h> 47 48 #include <machine/stdarg.h> 49 50 #include <compat/linux/linux_dtrace.h> 51 #include <compat/linux/linux_mib.h> 52 #include <compat/linux/linux_util.h> 53 54 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures"); 55 MALLOC_DEFINE(M_EPOLL, "lepoll", "Linux events structures"); 56 57 FEATURE(linuxulator_v4l, "V4L ioctl wrapper support in the linuxulator"); 58 FEATURE(linuxulator_v4l2, "V4L2 ioctl wrapper support in the linuxulator"); 59 60 /** 61 * Special DTrace provider for the linuxulator. 62 * 63 * In this file we define the provider for the entire linuxulator. All 64 * modules (= files of the linuxulator) use it. 65 * 66 * We define a different name depending on the emulated bitsize, see 67 * ../../<ARCH>/linux{,32}/linux.h, e.g.: 68 * native bitsize = linuxulator 69 * amd64, 32bit emulation = linuxulator32 70 */ 71 LIN_SDT_PROVIDER_DEFINE(linuxulator); 72 LIN_SDT_PROVIDER_DEFINE(linuxulator32); 73 74 char linux_emul_path[MAXPATHLEN] = "/compat/linux"; 75 76 SYSCTL_STRING(_compat_linux, OID_AUTO, emul_path, CTLFLAG_RWTUN, 77 linux_emul_path, sizeof(linux_emul_path), 78 "Linux runtime environment path"); 79 80 /* 81 * Search an alternate path before passing pathname arguments on to 82 * system calls. Useful for keeping a separate 'emulation tree'. 83 * 84 * If cflag is set, we check if an attempt can be made to create the 85 * named file, i.e. we check if the directory it should be in exists. 86 */ 87 int 88 linux_emul_convpath(const char *path, enum uio_seg pathseg, 89 char **pbuf, int cflag, int dfd) 90 { 91 int retval; 92 93 retval = kern_alternate_path(linux_emul_path, path, pathseg, pbuf, 94 cflag, dfd); 95 96 return (retval); 97 } 98 99 void 100 linux_msg(const struct thread *td, const char *fmt, ...) 101 { 102 va_list ap; 103 struct proc *p; 104 105 if (linux_debug == 0) 106 return; 107 108 p = td->td_proc; 109 printf("linux: jid %d pid %d (%s): ", p->p_ucred->cr_prison->pr_id, 110 (int)p->p_pid, p->p_comm); 111 va_start(ap, fmt); 112 vprintf(fmt, ap); 113 va_end(ap); 114 printf("\n"); 115 } 116 117 struct device_element 118 { 119 TAILQ_ENTRY(device_element) list; 120 struct linux_device_handler entry; 121 }; 122 123 static TAILQ_HEAD(, device_element) devices = 124 TAILQ_HEAD_INITIALIZER(devices); 125 126 static struct linux_device_handler null_handler = 127 { "mem", "mem", "null", "null", 1, 3, 1}; 128 129 DATA_SET(linux_device_handler_set, null_handler); 130 131 char * 132 linux_driver_get_name_dev(device_t dev) 133 { 134 struct device_element *de; 135 const char *device_name = device_get_name(dev); 136 137 if (device_name == NULL) 138 return (NULL); 139 TAILQ_FOREACH(de, &devices, list) { 140 if (strcmp(device_name, de->entry.bsd_driver_name) == 0) 141 return (de->entry.linux_driver_name); 142 } 143 144 return (NULL); 145 } 146 147 int 148 linux_driver_get_major_minor(const char *node, int *major, int *minor) 149 { 150 struct device_element *de; 151 unsigned long devno; 152 size_t sz; 153 154 if (node == NULL || major == NULL || minor == NULL) 155 return (1); 156 157 sz = sizeof("pts/") - 1; 158 if (strncmp(node, "pts/", sz) == 0 && node[sz] != '\0') { 159 /* 160 * Linux checks major and minors of the slave device 161 * to make sure it's a pty device, so let's make him 162 * believe it is. 163 */ 164 devno = strtoul(node + sz, NULL, 10); 165 *major = 136 + (devno / 256); 166 *minor = devno % 256; 167 return (0); 168 } 169 170 sz = sizeof("dri/card") - 1; 171 if (strncmp(node, "dri/card", sz) == 0 && node[sz] != '\0') { 172 devno = strtoul(node + sz, NULL, 10); 173 *major = 226 + (devno / 256); 174 *minor = devno % 256; 175 return (0); 176 } 177 sz = sizeof("dri/controlD") - 1; 178 if (strncmp(node, "dri/controlD", sz) == 0 && node[sz] != '\0') { 179 devno = strtoul(node + sz, NULL, 10); 180 *major = 226 + (devno / 256); 181 *minor = devno % 256; 182 return (0); 183 } 184 sz = sizeof("dri/renderD") - 1; 185 if (strncmp(node, "dri/renderD", sz) == 0 && node[sz] != '\0') { 186 devno = strtoul(node + sz, NULL, 10); 187 *major = 226 + (devno / 256); 188 *minor = devno % 256; 189 return (0); 190 } 191 sz = sizeof("drm/") - 1; 192 if (strncmp(node, "drm/", sz) == 0 && node[sz] != '\0') { 193 devno = strtoul(node + sz, NULL, 10); 194 *major = 226 + (devno / 256); 195 *minor = devno % 256; 196 return (0); 197 } 198 199 TAILQ_FOREACH(de, &devices, list) { 200 if (strcmp(node, de->entry.bsd_device_name) == 0) { 201 *major = de->entry.linux_major; 202 *minor = de->entry.linux_minor; 203 return (0); 204 } 205 } 206 207 return (1); 208 } 209 210 int 211 linux_vn_get_major_minor(const struct vnode *vp, int *major, int *minor) 212 { 213 int error; 214 215 if (vp->v_type != VCHR) 216 return (ENOTBLK); 217 dev_lock(); 218 if (vp->v_rdev == NULL) { 219 dev_unlock(); 220 return (ENXIO); 221 } 222 error = linux_driver_get_major_minor(devtoname(vp->v_rdev), 223 major, minor); 224 dev_unlock(); 225 return (error); 226 } 227 228 char * 229 linux_get_char_devices(void) 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 string = malloc(string_size, M_LINUX, M_WAITOK); 237 string[0] = '\000'; 238 last = ""; 239 TAILQ_FOREACH(de, &devices, list) { 240 if (!de->entry.linux_char_device) 241 continue; 242 temp = string; 243 if (strcmp(last, de->entry.bsd_driver_name) != 0) { 244 last = de->entry.bsd_driver_name; 245 246 snprintf(formated, sizeof(formated), "%3d %s\n", 247 de->entry.linux_major, 248 de->entry.linux_device_name); 249 if (strlen(formated) + current_size 250 >= string_size) { 251 string_size *= 2; 252 string = malloc(string_size, 253 M_LINUX, M_WAITOK); 254 bcopy(temp, string, current_size); 255 free(temp, M_LINUX); 256 } 257 strcat(string, formated); 258 current_size = strlen(string); 259 } 260 } 261 262 return (string); 263 } 264 265 void 266 linux_free_get_char_devices(char *string) 267 { 268 269 free(string, M_LINUX); 270 } 271 272 static int linux_major_starting = 200; 273 274 int 275 linux_device_register_handler(struct linux_device_handler *d) 276 { 277 struct device_element *de; 278 279 if (d == NULL) 280 return (EINVAL); 281 282 de = malloc(sizeof(*de), M_LINUX, M_WAITOK); 283 if (d->linux_major < 0) { 284 d->linux_major = linux_major_starting++; 285 } 286 bcopy(d, &de->entry, sizeof(*d)); 287 288 /* Add the element to the list, sorted on span. */ 289 TAILQ_INSERT_TAIL(&devices, de, list); 290 291 return (0); 292 } 293 294 int 295 linux_device_unregister_handler(struct linux_device_handler *d) 296 { 297 struct device_element *de; 298 299 if (d == NULL) 300 return (EINVAL); 301 302 TAILQ_FOREACH(de, &devices, list) { 303 if (bcmp(d, &de->entry, sizeof(*d)) == 0) { 304 TAILQ_REMOVE(&devices, de, list); 305 free(de, M_LINUX); 306 307 return (0); 308 } 309 } 310 311 return (EINVAL); 312 } 313