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/lock.h> 43 #include <sys/malloc.h> 44 #include <sys/kernel.h> 45 #include <sys/linker_set.h> 46 #include <sys/mutex.h> 47 #include <sys/namei.h> 48 #include <sys/proc.h> 49 #include <sys/sdt.h> 50 #include <sys/syscallsubr.h> 51 #include <sys/sysctl.h> 52 #include <sys/systm.h> 53 #include <sys/vnode.h> 54 55 #include <machine/stdarg.h> 56 57 #include <compat/linux/linux_dtrace.h> 58 #include <compat/linux/linux_mib.h> 59 #include <compat/linux/linux_util.h> 60 61 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures"); 62 MALLOC_DEFINE(M_EPOLL, "lepoll", "Linux events structures"); 63 MALLOC_DEFINE(M_FUTEX, "futex", "Linux futexes"); 64 MALLOC_DEFINE(M_FUTEX_WP, "futex wp", "Linux futex waiting proc"); 65 66 FEATURE(linuxulator_v4l, "V4L ioctl wrapper support in the linuxulator"); 67 FEATURE(linuxulator_v4l2, "V4L2 ioctl wrapper support in the linuxulator"); 68 69 /** 70 * Special DTrace provider for the linuxulator. 71 * 72 * In this file we define the provider for the entire linuxulator. All 73 * modules (= files of the linuxulator) use it. 74 * 75 * We define a different name depending on the emulated bitsize, see 76 * ../../<ARCH>/linux{,32}/linux.h, e.g.: 77 * native bitsize = linuxulator 78 * amd64, 32bit emulation = linuxulator32 79 */ 80 LIN_SDT_PROVIDER_DEFINE(linuxulator); 81 LIN_SDT_PROVIDER_DEFINE(linuxulator32); 82 83 char linux_emul_path[MAXPATHLEN] = "/compat/linux"; 84 85 SYSCTL_STRING(_compat_linux, OID_AUTO, emul_path, CTLFLAG_RWTUN, 86 linux_emul_path, sizeof(linux_emul_path), 87 "Linux runtime environment path"); 88 89 /* 90 * Search an alternate path before passing pathname arguments on to 91 * system calls. Useful for keeping a separate 'emulation tree'. 92 * 93 * If cflag is set, we check if an attempt can be made to create the 94 * named file, i.e. we check if the directory it should be in exists. 95 */ 96 int 97 linux_emul_convpath(struct thread *td, const char *path, enum uio_seg pathseg, 98 char **pbuf, int cflag, int dfd) 99 { 100 int retval; 101 102 retval = kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf, 103 cflag, dfd); 104 105 return (retval); 106 } 107 108 void 109 linux_msg(const struct thread *td, const char *fmt, ...) 110 { 111 va_list ap; 112 struct proc *p; 113 114 if (linux_debug == 0) 115 return; 116 117 p = td->td_proc; 118 printf("linux: jid %d pid %d (%s): ", p->p_ucred->cr_prison->pr_id, 119 (int)p->p_pid, p->p_comm); 120 va_start(ap, fmt); 121 vprintf(fmt, ap); 122 va_end(ap); 123 printf("\n"); 124 } 125 126 struct device_element 127 { 128 TAILQ_ENTRY(device_element) list; 129 struct linux_device_handler entry; 130 }; 131 132 static TAILQ_HEAD(, device_element) devices = 133 TAILQ_HEAD_INITIALIZER(devices); 134 135 static struct linux_device_handler null_handler = 136 { "mem", "mem", "null", "null", 1, 3, 1}; 137 138 DATA_SET(linux_device_handler_set, null_handler); 139 140 char * 141 linux_driver_get_name_dev(device_t dev) 142 { 143 struct device_element *de; 144 const char *device_name = device_get_name(dev); 145 146 if (device_name == NULL) 147 return (NULL); 148 TAILQ_FOREACH(de, &devices, list) { 149 if (strcmp(device_name, de->entry.bsd_driver_name) == 0) 150 return (de->entry.linux_driver_name); 151 } 152 153 return (NULL); 154 } 155 156 int 157 linux_driver_get_major_minor(const char *node, int *major, int *minor) 158 { 159 struct device_element *de; 160 unsigned long devno; 161 size_t sz; 162 163 if (node == NULL || major == NULL || minor == NULL) 164 return (1); 165 166 sz = sizeof("pts/") - 1; 167 if (strncmp(node, "pts/", sz) == 0 && node[sz] != '\0') { 168 /* 169 * Linux checks major and minors of the slave device 170 * to make sure it's a pty device, so let's make him 171 * believe it is. 172 */ 173 devno = strtoul(node + sz, NULL, 10); 174 *major = 136 + (devno / 256); 175 *minor = devno % 256; 176 return (0); 177 } 178 179 sz = sizeof("dri/card") - 1; 180 if (strncmp(node, "dri/card", sz) == 0 && node[sz] != '\0') { 181 devno = strtoul(node + sz, NULL, 10); 182 *major = 226 + (devno / 256); 183 *minor = devno % 256; 184 return (0); 185 } 186 sz = sizeof("dri/controlD") - 1; 187 if (strncmp(node, "dri/controlD", sz) == 0 && node[sz] != '\0') { 188 devno = strtoul(node + sz, NULL, 10); 189 *major = 226 + (devno / 256); 190 *minor = devno % 256; 191 return (0); 192 } 193 sz = sizeof("dri/renderD") - 1; 194 if (strncmp(node, "dri/renderD", sz) == 0 && node[sz] != '\0') { 195 devno = strtoul(node + sz, NULL, 10); 196 *major = 226 + (devno / 256); 197 *minor = devno % 256; 198 return (0); 199 } 200 sz = sizeof("drm/") - 1; 201 if (strncmp(node, "drm/", sz) == 0 && node[sz] != '\0') { 202 devno = strtoul(node + sz, NULL, 10); 203 *major = 226 + (devno / 256); 204 *minor = devno % 256; 205 return (0); 206 } 207 208 TAILQ_FOREACH(de, &devices, list) { 209 if (strcmp(node, de->entry.bsd_device_name) == 0) { 210 *major = de->entry.linux_major; 211 *minor = de->entry.linux_minor; 212 return (0); 213 } 214 } 215 216 return (1); 217 } 218 219 int 220 linux_vn_get_major_minor(const struct vnode *vp, int *major, int *minor) 221 { 222 int error; 223 224 if (vp->v_type != VCHR) 225 return (ENOTBLK); 226 dev_lock(); 227 if (vp->v_rdev == NULL) { 228 dev_unlock(); 229 return (ENXIO); 230 } 231 error = linux_driver_get_major_minor(devtoname(vp->v_rdev), 232 major, minor); 233 dev_unlock(); 234 return (error); 235 } 236 237 char * 238 linux_get_char_devices() 239 { 240 struct device_element *de; 241 char *temp, *string, *last; 242 char formated[256]; 243 int current_size = 0, string_size = 1024; 244 245 string = malloc(string_size, M_LINUX, M_WAITOK); 246 string[0] = '\000'; 247 last = ""; 248 TAILQ_FOREACH(de, &devices, list) { 249 if (!de->entry.linux_char_device) 250 continue; 251 temp = string; 252 if (strcmp(last, de->entry.bsd_driver_name) != 0) { 253 last = de->entry.bsd_driver_name; 254 255 snprintf(formated, sizeof(formated), "%3d %s\n", 256 de->entry.linux_major, 257 de->entry.linux_device_name); 258 if (strlen(formated) + current_size 259 >= string_size) { 260 string_size *= 2; 261 string = malloc(string_size, 262 M_LINUX, M_WAITOK); 263 bcopy(temp, string, current_size); 264 free(temp, M_LINUX); 265 } 266 strcat(string, formated); 267 current_size = strlen(string); 268 } 269 } 270 271 return (string); 272 } 273 274 void 275 linux_free_get_char_devices(char *string) 276 { 277 278 free(string, M_LINUX); 279 } 280 281 static int linux_major_starting = 200; 282 283 int 284 linux_device_register_handler(struct linux_device_handler *d) 285 { 286 struct device_element *de; 287 288 if (d == NULL) 289 return (EINVAL); 290 291 de = malloc(sizeof(*de), M_LINUX, M_WAITOK); 292 if (d->linux_major < 0) { 293 d->linux_major = linux_major_starting++; 294 } 295 bcopy(d, &de->entry, sizeof(*d)); 296 297 /* Add the element to the list, sorted on span. */ 298 TAILQ_INSERT_TAIL(&devices, de, list); 299 300 return (0); 301 } 302 303 int 304 linux_device_unregister_handler(struct linux_device_handler *d) 305 { 306 struct device_element *de; 307 308 if (d == NULL) 309 return (EINVAL); 310 311 TAILQ_FOREACH(de, &devices, list) { 312 if (bcmp(d, &de->entry, sizeof(*d)) == 0) { 313 TAILQ_REMOVE(&devices, de, list); 314 free(de, M_LINUX); 315 316 return (0); 317 } 318 } 319 320 return (EINVAL); 321 } 322